Science topic

Chronology as Topic - Science topic

The temporal sequence of events that have occurred.
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I'm trying a time series analysis using Minitab software. My data is distributed over 15 dates. The output fig showed 10 random dates only on the X axis. How can I solve this issue? I appreciate your help.
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اخي الفاضل ادخل الى برنامج التلغرام وهناك قناة الاحصاء وتطبيقاته اشترك فيها وستجد باذن الله كل الكتب والتطبيقات الخاصة بسؤالك مع التقدير
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Please shear the articles link.
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Dear Dr Prasanta Pattanayak, please have a look at the following free access document, and a similar RG thread. My Regards
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date of publication
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The publication date i.e. the date on which volume number was allotted and the final published version was available online can be easily obtained from Google Scholar profile of researchers. Click on a article in Google Scholar profile (not on the search results in Google Scholar) of a researcher who authored that article. It will show a page containing all information regarding the article including publication date. Please refer the attached image for an example.
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I Am unable to find relevant & up to date data. Few newspaper articles have stated that almost 50% of the construction workers are female. However, they have not mentioned their source. I personally believe that the number is much lower
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few newspaper & latest research article this topic.
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Special ZSM-5 catalyst (synthesis and technical data) for converting C4+ olefines to light olefines.
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I would like to suggest you two publications. I hope you will find date for your research.
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I'm working on an update to our previous global geochemical database. At the moment, it contains a little over one million geochemical analyses. It contains some basic geochronology data, crystallization dates for igneous rocks and depositional dates for sedimentary rocks. The database differs from GEOROC and EarthChem, in that it includes some interpretive metadata and estimates of geophysical properties derived from the bulk chemistry. I'd like to expand these capabilities going forward.
What would you like to see added or improved?
Here's a link to the previous version:
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A format that can be adopted by GIS!
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In using the Turnitin, how can I exclude documents that have been published after my documents were previously published? Is there any option to determine the date?
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You won't be able to exclude the studies.
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Hello,
I am looking for controversial books related to AI and its relation with human development. This is such a broad seek, any book that fits into this broad topic, please share a direct link with me.
Desired publication dates: 2018-2022
Appreciated
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Gödel, Escher, Bach: An Eternal Golden Braid,
Fluid Concepts and Creative Analogies
Artificial Music
The books by Douglas Hofstadter
The above-mentioned books are no controversial but work reading if we are thinking of AI in real time implementation
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Hi folks!
I have some questions regarding EBSP analysis and panmixia. I hope someone can help me, please deal with this.
1 – Is it ok to include EBSP analysis in a paper if we violate panmixia? I read papers demonstrating the issues of performing EBSP analysis with structured populations, especially if they are declining in size. But, at least for neotropical trees, it is really difficult to not find a degree of structure in populations. So, is it fair to use the analysis even though with the violation and then report to interpret it with caution? I started to overthink… If coalescence assumes a Wright-Fisher population, thus even performing analysis in BEAST, such as estimating the dated tree could be wrong for some kind of data. Does it make sense?
All the best!
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Thank you for your answer. This was taking my sleep. I am just now studying Held and Drummond paper. I also agree with you, it depends on the situation!
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Hi, my data has coordinates ( x and y) at district level, dates and daily covid cases on that particular date (not daily total cases). What can i do with the data? i have done spatiotemporal analysis but not sure if it's correct. I dont have access to do the Arcgis pro tutorial. i want to do hot spot and prediction of coming hot spot but how can i do it with this same coordinates which has different time only.
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Perhaps you may try Hotspot Analysis – a plugin for the Free Open Source Software (FOSS) QGIS.
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I am not actively participating in drug discovery processes anymore, however I would like to keep myself up-to date about industrial trends.
Scientists, researchers, anyone who is working/interested in Medicinal Chemistry related fields: What are the best resources to stay on track and follow scientific trends and news?
Thanks in advance for any suggestions that worked for you!
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I generally concur with everything mentioned so far. Expose yourself to trends and technologies. I highly recommend looking into Phenotypic Screening vs. target based screening.
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Hello,
Would anyone have any suggestions for up to date resources regarding the optimum amount of hours for synchronous learning? I am looking for data on optimum number of hours of digital learning per day, per week, and per month.
I would also be interested in any research done on the optimum duration of a virtual classroom.
Any suggestions for up to date literature would be helpful and welcomed.
Thank you!
Aliaa Shaaban
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There are many criteria, the most important of which is the interview and the open book test
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website for researching a special issue dates
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Thank you all for your responses
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A paper is published before 30 June 2022 of impact factor 1.6 then in New JCR after 30 June it's impact is decreased or removed from JCR list. Now it's impact will consider in previous date or of the new date.
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Impact factor is counted for the current year, if the impact factor of a journal is reduced or the journal is removed from the list it will be for next year, all the previous year submissions will remain accepted.
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I am applying Bai and perron (1998) structural change model in eviews using sequential l+1vs l. It's giving me different break dates in sequential and repartition method. Which one to consider.
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@Brajesh Mishra sir for the link...
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My paper was accepted for a paper presentation under this conference:
International Conference on Law and Political Science(ICLPS)
Date: 18th - 19th November, 2019
Venue of Meeting Presentation: Embassy Suites Los Angeles- International Airport South
Address: 1440 East Imperial Avenue, El Segundo, CA 90245, United States of America
This conference was managed by International Institute of Engineers and RESEARCHERS (IIER) with website address
IS THIS A LEGITIMATE?
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Just click on publication and you find for example the journal “Webology“ as Scopus indexed journal, buta quick look in Scopus sources tells us that there are discontinued in 2021 (https://www.scopus.com/sourceid/4400151723?origin=resultslist ).
Together with no real contact info is already enough to conclude: avoid this one.
Best regards.
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I have timeseries data,when i plot it in python by using pandas it shows me more fluctuations.The plot on same data i try in excel and it never shows so many fluctuations.Further i have checked excel is doing correct.In order to make results accurate i just remove Date as index and it shows same plot as in excel.I want to know where i am doing mistake.
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1. Is your data file .CSV or Excel?
2. Can you show us the dtype of your date column when it is read with and without parsing?
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Hello everyone. I am currently carrying out a research project using the FAO's AquaCrop crop modelling software, calibrated and validated with data from field trials on wheat in Morocco. I have imported observed climate and soil data from my study site for several seasons, as well as creating several wheat crop files for different cultivars, based on field observations, taking care only to alter the cultivar specific and not the conservative crop parameters.
When I run the simulation, the harvest index seems to be constant throughout, no matter which of the three seasons I have climate data I use, or which planting date or water regime I specify. The different seasons, planting dates and water regimes obviously affect the amount of water the crop receives, and this should affect the harvest index (as indeed it does in the yield results I have from the field trials). However in my simulations the harvest index is always around 46%, just below the reference HI of 48%. The total biomass (and so yield) varies considerably, but not the HI. This is definitely not right, and is totally out of step with the field trial results, where total biomass and HI (and so yield) both vary depending on the season, water regime and planting date. I've attached two screenshots of my results from AquaCrop for two different planting dates for the same crop in the same year, where the second planting date receives much less water. The second date has much less total biomass but the same HI, which doesn't seem to be affected by the water stress at all. Has anyone else experienced a similar problem and have any ideas? Thanks very much!
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Dear Joshua,
Sorry, maybe it's too late to answer. In any case, it's difficult to answer/solve the issue without seeing all the model outputs. As a first step, could you share the screenshots of the 'Climate-Crop-Soil water' sheet?
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I'm looking for datasets containing coherent sets of tweets related to Covid-19 (for example, collected within a certain time period according to certain keywords or hashtags), containing labels according to the fact they contain fake/real news, or according to they fact they contain pro-vax / anti-vax information. Possibly, the dataset I'm looking for would also contain a column showing the textual content of each tweet, a row showing the date, and columns showing 1)The username /id of the autohor; 2)The username/id of the people who retweeted the tweet.
Do you know any dataset with these features?
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@Luigi Arminio,
This attached screenshot maybe useful. Thanks~PB
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I exactly need the dose or quantity can I give to the rats
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Thank you for your answer; but i need more explication
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Learning new techniques and being up to dated with what's happening in dental field became not limited to textbooks or university degree programs nowadays. There are new platforms, methods that became so popular among practitioners. what are these new methods and are they effective and can depend on?
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Keep reading, join lecture course, discuss problem with colleagues.
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Has everyone had trouble with ELISA which is a low absorbance value including standard and positive control? I've already tried to prepare a new reagent, check the expiration date, etc. but the result still doesn't work. What should I suppose to do? or any suggestion about this?
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Besides the steps that you have taken, you need to check for the following.
1. Have you given too many washes than what has been recommended?
2. Have you used the washer system, if yes, then is the system free of microbial contaminants?
3. Have you kept your plate for a short incubation time than what has been recommended?
4. Were the reagents and plate kept at room temperature at least 2-3 hours before starting the assay?
5. Just confirm that you have read the plate at the right wavelength.
6. Is your plate reader functioning well?
7. Has the detection reagent been too dilute?
8. Have you coated insufficient amount of antigen, or have you used less concentrated antibody?
9. You may check the history of the kit usage namely, how many times the kit has been removed from the refrigerator, or has the kit been exposed to temperatures at which it was not supposed to be.
10. Was the plate stored in sealed bag with a desiccant to maintain stability?
Hope these above questions may help you solve your problem!
Best.
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I have registered for conference well held in Singapore from 9-10 September 2019 
I want to ask if this event is a real event.
Name of event: International Conference on Applied Mathematics and Science (ICAMS-19) 
Organization: WRF CONFERENCE 
Date: 9th-10th SEP 2019
Best regards
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Hello Usama,
I would not spend any time looking at that 'conference'.
I quote from that page,
"The main focus of conference is to improve the , accelerate the translation of leading edge discovery at research level"
Ungrammatical, misspelled.
But the main issue I have with it, is that there is no topic.
What on Earth is this conference about?
An event so broad in scope cannot hope to be useful in attracting an audience that would actually be beneficial to its attendees.
The link to "Upcoming conference" does not work. The telephone number is a British one (+44) but the Whats App number is not.
If you can tell me your field of interest, I might be able to suggest some useful meetings. My background is in aerospace systems, material testing for oil & gas firms, and respiratory medical devices.
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Can someone recommend a comprehensive and up to date textbook on molecular docking?
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1. Molecular Docking for Computer-Aided Drug Design
Fundamentals, Techniques, Resources and Applications
2. Molecular Docking and Molecular Dynamics
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My problem is that cassiterite measured on LA-ICP-MS is around 30Ma older than monazite from cassiterite parental granite. Monazites from one sample have wide age distribution (70Ma).
LA-ICP-MS methodology
Data processing and calculation of abundances, isotopic ratios and dates were carried out off-line through the software Iolite v. 2.5, using for the dating also the Iolite-integral VizualAge data reduction scheme by Petrus & Kamber (2012), and for the trace elements determination the Trace_Elements_IS data reduction scheme.
EMPA
calculated from Suzuki 2008
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What is needed to better assess this age difference is the temperature of crystallization of both minerals and their sensitivity to subsequent heating/chemical induced modifications at post-crystallization stage of the granite. Cassiterite is an oxyde mineral that is quite stable once crystallized, as for monazite, a phosphate, it can be more easily recrystallized via fluid or high temperature events affecting the granite. The spread of 70 Ma in monazites seems to reflect that one or more events induced partial Pb loss in the minerals. Cassiterite is more resistant and has possibly a more 'locked-in' age. You will need to verify the stability of both minerals to metamorphic and hydrothermal events that happened in and around the granite to support your interpretation of these age ranges. You need also to assess the crystalline capacity of each mineral to retain U and/or Pb in its structure, the more 'similar' in ion size and valence an element is to the other (eg. Sn vs Pb) the more likely the crystalline structure will retain the new element during a metamorphic event.
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Dear community,
What is the code to perform a Fama-MacBeth regression in Stata? I understand how this works theoretically, but I do not understand how this is implemented in Stata. My variables are the 5 factors of the Fama French 5 factor model and 25 portfolios double sorted on size and book-to-market value of equity.
Additionally I have another question as well. That is, in order to test the Fama French 5 factor model, you just regress the factors on one of the portfolios right? In other words, is the correct code to test the 5 factor model:
- tsset date (in order to declare dataset to be time-series data with date as the time variable)
- reg me1bm1 markt smb hml rmw cma (where me1bm1 is the portfolio with lowest marketcap and lowest B/M and the other 5 variables are the 5 factors).
When I use this code I get very strange results, namely that almost all intercepts are significant (which is in contradiction with the Fama French papers). Hence, I am wondering whether there is something wrong with this code. I hope you all could help me with these 2 questions!
Yours truly,
Niek
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Aarthur Schlitz please can you share those satata codes that you have developed to perform FF-3,5
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I am looking for institute or research center that provided ESR dating service for sediment that estimated over 500kya.
I want to know about the sample preparation to send to the lab and overall cost to determine all the parameters needed (equivalent dose, dose rate etc.).
Thank you for your response and time!
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I suggest you contact Bhabha atomic research center in India too.
Bhabha Atomic Research Centre ( BARC ), Department of Atomic Energy, Government of India
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Assume that one is building upon an already tested , statistically significant, peer reviewed and published idea (e.g. could be some X and Y relationships). Unfortunately, replication of the original idea isnt working this time, impeding further development of the idea. Considering such studies alone allow us see the original phenomena from a different perspective, why then are not such studies a candidate for publication? Wouldnt such non-significant studies motivate new research that looks into why the second study failed? Ofcourse , there might be some variables that change over time (T1-original study date and T2-replicated study date) that probably brought in the shift of the effect from being significant to non-significant (e.g. change in technology, universal events that changed how people behave,...etc). I always wonder why journals are only seeking after a statistically significant effect, but that principle immediately changes for a meta-analysis.
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I agree 100+ with Medhat Elsahookie And, why repeat an experiment anyway? Just submit the original research :)
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I need to plot /run trend analysis on 5 variables simultaneously in XLSTAT. Measurements were taken same dates, and as such date series is same. Having the graphs together enables easy comparison. Just something like attached below.
Thanks for your contribution in advance
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We love our conferences as we reconnect with colleagues, meet and greet new friends, visit new places, and enjoy the technical and social programs of the Conference.
It is indisputable that conferences these days are commercialized to the extent that African and Asian countries researchers can't afford attending, thus deepening the scientific and technological gap among researchers based on income and other factors. In my view, This is unethical. Fees system must be revised to address such serious problem.
Furthermore, the greediness extends beyond commercialization to ethics. It is becoming the norm to see the deadlines for paper submissions, acceptance dates, and camera ready dates are extended frequently to get more submissions. Such behaviour negates what we teach and preach about meeting deadline to our students and colleagues. I am puzzled to what I can say to my students when I am confronted by a request to extend the deadline for a Homework, an exam, or a Final.
It is about time that we adopt an ethical system where there is no deadline extensions and make our conferences feasible to attend for all researchers.
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It would be better the state's support.
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I need some data to build apple phenology model for Japan. Any apple phenology data (even for other countries) are greatly appreciated! I need location latitude/longitude, apple variety/maturity rating, observation dates and observed growth stages.
Thanks much!
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In this work there are phenological data for at least three apple varieties in Spain. The paper is not in English, but in Spanish.
Best regards.
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How can I measure/predict soil temperature from climate data?
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Remote sensing data like surface temperature can help in mapping soil temperature.
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I thawed out two separate vials of 293Ts, frozen on different dates, from two different people. They both look like this; clumped up, weirdly shaped cells. I changed their media after thawing after 24 hours and it has now been a week. I use DMEM +10% FBS +1% P/S.
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Tom Masi Got it, I will try supplementation. Thank you for your help!
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I have done a deep internet search, but none of Thermo's handbooks/sheets give any expiration date. Has anyone used a >10 year-old kit and compared results to those of a newer one?
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1/27/22
Dear Taylor,
Are you interested in knowing the useful shelf life of BCA reagent? Or do you need to do a protein assay and have only a 10-year old kit and no funding to purchase new reagent? In the latter case, assuming you need to do a critical measurement, I'd stay away from the old reagent and get a new one.
If you want to know the useful shelf life of BCA reagent, the simplest thing to do would be to contact Pierce Chemical Company and inquire. Since they make and sell the reagent, they must have this information.
I hope this helps you.
Bill Colonna
Iowa State University, Ames, IA wcolonna@iastate.edu
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As there are plenty of dating methods available in literature. Which one would be the best?
Thankyou.
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Each dating method is limited by physical and organic parameters (half-life, stratigraphic range...) and the availability of target and host minerals.
This is valid for each and every environment of formation.
HGD
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I have a dataset with date variable as character type in R. Date variable is showing some values like this for example 1836518400 1839196800. How should i convert it to normal date format? like yy-mm-dd.
I guess this is Posixct format. Can anybody help with the script. What script should i use to convert it into normal date format?
Best,
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To convert character data to dates, use the as. Date() method. Date(x, "format"), where x is the character data and format returns the proper format.
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Hi
I'm working on cell culture, but I can't grow my HL-60 line. The closing date of the cells is 2019, in the study conducted on this date, the cells were growing at full performance, but currently it takes only 3 days to grow. I change the medium every 3 days, centrifuge at 300xg for 5 minutes and the cells do not settle to the bottom. What could be the reason why the cells do not sink to the bottom after centrifugation and what prevents their growth?
(Note: I remove the cells from liquid nitrogen and centrifuge at 300xg and 5 minutes for the first time in the washing process, and the cells settle to the bottom.)
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Maybe all cells are dead in stock.
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In my studiesf there has been instances, where the same announcement has been made many companies on the same date. What is best way to overcome it.
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The specification and power of mean-adjusted, market and quadratic models in event studies using OLS, Patell, Jaffe and GLS are examined. Simulation is used with security and portfolio returns to capture different cross correlations. The market model is always superior in specification and power compared to the mean-adjusted and quadratic models. The use of OLS with the market model is supported in the absence of clustered events and event day uncertainty, whereas use of Jaffe with the market model is supported in the presence of these problems. Copyright 1997 by Kluwer Academic Publishers
Regards,
Shafagat
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the input data if between 2006 and 2020, and the number of years I choosed is 100 years. So the generated data gives 100 years values from year 1 to year 100 without mentionning any dates.
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Hi dear Sara Guemar,
The first and most important thing is that lars works as a stochastic tool. Therefore, it is important that you understand how the LARS works.
Firstly, I want to emphasize a key point. You mentioned that you chose 2006-2010 as your baseline. If you are going to publish your research as a scientific article, you should choose the standard period of 1980-2010. Lars is calibrated for the period.
Secondly, you asked what is the start of the period selected for 100 years? After choosing a GCM model and scenario, you must select a period. When the selected period is, for example, 2041-2060, it is not important whether you choose 100 years or 10 years; the model will generate data for that period. My description of it is as follows.
As I told you lars is a stochastic weather generator. It means the output of Lars is not a time series. This means that the numbers for 2042 are not after 2041. Thus, averages (or std) of series can only be used for analysis. LARS is not a prediction tool, but a projection tool.
You can test this out for yourself. For the period 2041-2060, generate data once for 20 years and once for 100 years. Then compare the average of the temperature and precipitation for the two series. You will see that the means are very close to a very good approximation.
Finally, you should know that you are allowed to analyze the results on a monthly basis since Lars does not support daily changes unless you manually create scenarios based on daily GCMs.
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I was suppose to run a study test on some of the prepositions of the control-value theory of achievement emotions. My goal was to do it with a sample of students (11 years - university) which is now kind of impossible as they are all lockdown.
One other restriction is my due date which is early August.
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I suggest that you think of different strategies to collect data in accordance to your study and time constraint. Such alternatives would be: instant messaging, online (video call, audio call) interviews instead of face to face interviews. Using google form as a survey is an option to a survey.
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To date, there are only five recognized Platonic solids: The tetrahedron, the cube, the octahedron, the icosahedron, and the dodecahedron. Why not a five-sided Platonic solid? But, if found or discovered, then what would be the benefit?
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Also check please the following very good link : http://www.math.utah.edu/~alfeld/math/polyhedra/polyhedra.html
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Does anyone know up to date research on how Kolb's learning theory vs. Neil Fleming's theory {VARK} work in tandem with Gardner's Multiple Intelligences ? I am more interested in how the MI theory correlates with Learning Styles of students. In that way teachers can develop lessons tailored to a student's (child's) learning style. I found the attached, but need more evidence. Thanks!
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Kevin and Mariappan,
Thank you for responding. What peer reviewed evidence can you offer that demonstrates learning styles by Kolb and Fleming are debunked; in addition to Howard Gardner's Multiple Intelligences? Finally how do you think we learn? Are there any theorists or theories you can offer based upon peer reviews ? Again, thank you and I look forward to this healthy dialogue.
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Germany has taken two environmentally-friendly decisions to phase out nuclear and coal power by 2022 and 2030 respectively. The country also has shown the capability of expansion of renewable energy to replace the gap, and it is successful to date.
However, facing future energy demand within this framework could be a challenge. I would like to discuss this matter with energy experts.
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I have worked in the power industry for over 40 years and have been inside most of the nuclear plants they're closing in Germany. I've even been to the top of the tower in Uentrop before they tore it down. Sadly, many of these decisions are being driven by public sentiment rather than science and made by politicians rather than experienced engineers, who are seen as evil and stupid. I want what is best in the long run for the most people and the environment, which is complicated in a day when only simplistic feel-good answers are allowed.
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Hello all!
I am working on a time series model by using FB prophet. One of the issues I have is that in certain days, the model is consistently over or under forecasting. General diagnosis I have for these over or under estimations indicate potential outliers on those dates. However, on those dates, there are reasons for variation/outliers but the magnitude may not be taken into consideration accordingly by the model. What I mean by this is that we do have certain events happening on these dates that we do expect it to go up & down based on the changes in some of the variables. It is adjusting to the variable to update the yhat but I can not seem to figure out the reason in some days. Lets say every 4th Thursday of the month it overestimates but in other 3 it is within the reasonable error margin.
Any ideas or suggestions as to where I should focus on to figure out this very particular issue?
I have looked into many potential external factors that may cause these changes but so far have not been able to solve the issue with any additional variable hence I am now looking into the y itself to see if there are any obvious things that I am missing.
Looking forward to brainstorming with you all.
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Yes as per the definition, an outlier in one analysis may not be an outlier in another analysis. Depending upon the nature of the problem for which we are looking for rightly said by David Eugene Boot Outliers are in the eye of the beholder since you set the criteria, and further sources can be checked.
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Does the dates to evaluate the age vary with analytical methods ?
207Pb/235U dates,208Pb/232Th dates, 206Pb⁄238U ,LA-ICPMS
Leucogranites, Himalayas
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Dear Tanya Srivastava this is a very interesting and important technical question. In this context please have a look at the following potentially useful literature references which might help you in your analysis:
Using Th-U-Pb geochronology to extract crystallization ages of Paleozoic metamorphic monazite contaminated by initial Pb
and
U–Pb dating of monazite and its application to geological problems
Fortunately the first articles has been posted by the authors as public full text on RG, so that you can freely download it as pdf file. The author of the second paper is an RG member. Thus you can easily contact him via RG and request the full text directly from this author.
Good luck with your work and please stay safe and healthy!
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Dear colleagues, my team and I are currently working on developing isotopic dating methods in our lab focused on dating faults and set time constraints on the post-rift tectonic events of the Brazilian passive margin. We are already working with fault-filling calcite U-Pb data, but we also have several samples of epidote veins that we would like to investigate with LA-ICP-MS. I am aware of Peverelli et al. (2020) very interesting work about U-Pb dating of fault-related epidote using allanite as both primary and secondary standards, but we are open to other suggestions of matrix-matched reference materials if you have any. We are also looking for the Tara allanite standard for that matter, so if anyone knows a quicker way to acquire it would be of great help.
Thank you for your attention and best wishes to you all!
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Hello and good health, I am a doctor of petrology in Iran and I have worked on the faults of northwestern Iran and the volcanic regions of Iran and Turkey, especially Sahand volcano, and I have several articles. I will be happy to work with you and help you. I am waiting for your message. Thank you so much
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Hi All,
I am looking for an efficient way for punching out circular scaffolds from a sponge like material. I think, a biopsy punch should work, but the ones I have tried till date have failed. Can anyone suggest a biopsy punch from any company that can do the job or any other method?
Thanks a lot
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Rani P Ramachandran
, do you have any specific company in mind regarding the biopsy punch? I tried 2 companies and they could not punch through. Have you used onefrom any specific company?
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I followed some answers from this forum, so I went to control panel and change language and format in my laptop, I have English USA; and mm/dd/yyyy, in my shoreline layer the dates I have been using are with the same format dd/mm/yyyy. but the problem persists. thanks for the help.
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Also the date in the shoreline column should be in the format mm/dd/yyyy hh:mm:ss, which means the date should be a string of 22 precision as seen in the attachment. You can just add a new field for the layer in this format and change the option in default parameter dialogue box.
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I was running ELISA for human EGF (hEGF) protein using hEGF ELISA kit. To ensure my work, I also run the commercial standard from Sigma (E9644). However, the result showed that the standard from Sigma give negative result (it is colorless). But the standard from the kit is giving positive result (yellow color). (Shown in the figure)
At first I thought that there is a problem with Sigma's standard but, the RP-HPLC result indicates that it was still good and have a good peak.
Do you know why this is happen? or have anyone experienced this and manage to troubleshoot it?
Note:
The kit I used has already past its expiration date. But since the standard from the kit is working properly, it seems it still be fine.
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As recomonded, always use the standards provided with the ELISA kit. Please do not use the standards from other company since the kits are developed by standardizing all aspects in order to give optimum reliable results. Hence, the use of other company standards in a commercial kits are not recomonded/reliable.
Best
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I have observed that the structural breaks suggested by model structural break test like Chow test or Bai-perron are sometimes different from unit root with structural breaks test such as Lee Stracicizh, Zivot-Andrew or Narayan and Poop. Many papers especially the dynamic models such as VAR and ARDL considering structural often sometimes confuse the reader as regards how the structural breaks is chosen.This begs the question which break date is appropriate the unit root break date or the model break date.
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Hi,
When your data series shows structural break, conventional unit root tests are no more relevant (because SB alters the unit root tests results) and you have to use a unit root test that takes into account and reveals the SB. Perron (1989) asserted that unit root tests to be carried out without considering structural changes would produce erroneous results. Structural break unit root tests initiated by Perron (1989) have been studied by Zivot-Andrews (1992), Perron (1997), Ng-Perron (2001) and Lee-Strazicich (2003) using different algorithms. In these methods, one or two structural breaks are allowed in series. However, Bai and Perron (2003) and Carrion-i-Silvestre et al. (2009) have proposed tests that can determine multiple structural breaks (Göçer and Peker, 2014a, 2014b; Göçer, 2015).
However, if your goal is to identify SB (say you're working with returns rather than prices of stock markets so you are not worried about stationarity), there are specific tests without passing by unit root tests such as ICSS algorithm of Inclan and Tiao (1994) and the modified version of 2004, CUSM type tests, Nyblom Test, Hansen test, and many others.
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One field in my dataset consists of dates a request has been made to haul goods. On not buisy days, no requests will be made, and thus certain days are completely empty. I have aggregated/counted the date occurrence and input into a dictionary: date(key) and date-occurrences(value). I am then using this dictionary to predict/forecast on next year.
- Mine issue is then whether or not this can treated as time series analysis?
When I run a dickey fuller test, the data seems stationary on both series (with and without dummy dates). I fill out the missing dates and increment all the values by one.
- Also AICs seem to be high (see "FitSarima").
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It seems to me that those dates are not missing they just have values of zero. Why not just use the observed value instead of trying to impute a wrong number. David Booth
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Im using the BFFM 50-item, likert scale to compare personality traits for online dating users and non-users, I'm unsure what kind of statistical analysis to use? These are my hypotheses:
Hypotheses 1: Non dating sites users score lower for openness, agreeableness, neuroticism, extraversion and higher for conscientiousness.
Hypotheses 2: Dating site users score higher for neuroticism, agreeableness, extraversion, openness and lower for conscientiousness.
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Stephen Joy, thank you!
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Hi everybody,
we sent a short communication to : Probiologist -Archives of Clinical Toxicology (https://probiologists.com/Journal/Archives-of-Clinical-Toxicology), that has been accepted on November 10, 2020. To date, the article is still "in-press" ( "Neurotoxic amyloid prefibrillar oligomers: Do salmon calcitonin and amyloid β1-42 wear the same "outfit"?)
As an author, I wrote several times to the journal board, but no one replied to my emails.
Have someone else had the same problem with this journal ?,... Do you know if Is it a predatory journal?
Regards
Marcello
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Dear Rob Keller,
very thanks for your kind reply. Your observations are extremely noteworthy..I fully agree with you..it was not a good idea to submit to this journal..for sure this is not a serious journal.. they also avoid any reply to my emails...I discourage everyone to send paper to this journal.
very Kind Regards Marcello
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Let d be the n-th day of a year 2000+n, where n> - 248. Take the sum d + n + floor[(n + 3)/4] - floor[(n - 1)/100] + floor[((n - 1)/400] modulo 7. If the remainder is 0 then the day is Friday,
if the remainder is 1, then the day is Saturday, if the remainder is 2, then the day is Sunday, ..., if the reminder is 6, then the day is Thursday .
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It works!
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Respected Researchers
Smart questions in the field of medical psychology Algorithms
A child (10 years old), suffering from blindness, (7) months ago, the ophthalmologist diagnosed him that the success of his operation was approximately (75%), but after (5) months had passed, that is, when the date of the operation came and the doctor diagnosed him again, he confirmed the success rate of the operation (3%) is due to acute retinal detachment.
What is the reason for that in your opinion?
Should the choice of answer be with an adequate explanation of the case?
Alternatives:
· The child falls on his eyes.
· Parents' lack of interest in cleaning the child's eyes
· Serious psychological causes in the child.
Yours sincerely,
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Respected Doctor
I am happy with your participation, and your elegant and flowering presence, because we will certainly benefit from your scientific expertise. Yes, there should be a full explanation of the situation.
Greetings to you
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Hi all, my lab currently uses thermofisher's Pierce protease and phosphatase inhibitor mini tablet. I noticed that the expiry date was back in May 2020. I keep the tablets at 4°C, and dissolve 1 tablet in 10ml of RIPA lysis buffer, and store those in -20°C after aliquoting them into 1ml eppendorf tubes. However, I frequently freeze-thaw those 1ml eppendorf tubes as my experiments only require a small amount of RIPA buffer each time. Will the phosphatase inhibition still work after the tablet's expiry date?
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It will probably work, but will loose efficacy over time, also the freeze thawing is not helping either. I would make those 1mL aliquots expendable, once thawed it is trash. In my experience, I don't want to chance the results of the experiments at a critical timepoint due to questionable protein storage. Best to use fresh so as to avoid spending time guessing/ troubleshooting random questionable results. Justifying saving a few dollars, which may be a fraction of what the total cost of the experiment, is not worth the time and effort correcting the problem.
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Errors
Error 60 : At node 'Node_671' the water level is more than 10.00 m above the ground level. Perhaps due to too long time stepsInfo: The entry FLOODLIMIT in the "dhiapp.INI" file was set to: 10 [m]. The default value is: 10 [m].
Error 90 : Calculations terminated at the time 2018-08-11 12:01:10 [ 0 : 00:01:10 ]Simulation start date :2018-08-11 12:00:00
Simulation end date :2018-08-11 18:00:00
Warnings
Warning 710 : The diameter for the manhole in node 'YS031139' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12444.The diameter for the manhole in node 'YS031133' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12444.The diameter for the manhole in node 'YS031139' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12445.The diameter for the manhole in node 'YS031141' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12447.The diameter for the manhole in node 'YS031139' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12447.The diameter for the manhole in node 'YS031143' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12449.The diameter for the manhole in node 'YS031141' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12449.The diameter for the manhole in node 'YS031145' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12451.The diameter for the manhole in node 'YS031143' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12451.The diameter for the manhole in node 'YS031147' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12453.The diameter for the manhole in node 'YS031145' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12453.The diameter for the manhole in node 'YS031149' is 5.00 m. This is smaller than the diameter 5.50 m, of the connected link 12455.The diameter for the manhole in node 'YS031147' is 5.00 m. This is
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That is a good question.
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To date, FDA has approved in total 3 siRNA-based drugs since 2017. According to official sources Patisiran (Onpattro) - the first siRNA-based therapeutic approved by FDA, costs over $450,000 per patient per year. The average annual cost of the second FDA-approved siRNA-based drug Givosiran (Gilvaari) is approximately $575,000. Meanwhile the third, and last (up till now) approved siRNA drug Lumasiran (Oxlumo) costs over $490,000.
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Actually, you'll need to provide evidence to persuade me. The costs of clinical trials, even phase 3, are nothing like what pharma claims. Let alone the market-driven approach to discovery often results in faulty trial designs that are more marketing tools than actual science, interfering dangerously with the practice of medicine. Rare diseases, hereditary or not, are very often largely publicly funded from bench almost all the way to bedside. The capital contribution of companies dwindles as their ransom demands absurdly and horrifically increase. And more people around the world suffer and die because of their greed.
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I need make a downscale with NDVI (independent variable) and biomass (dependent variable) date. Have any process or ModelBuilder structure for this?
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Also you can use GWR for Grid Downscaling included in SAGA.
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i need an up to date ultraviolet radiation satellite reading for my research work. that is a reading which is up to 2021. thank you
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Hi, try to look at this website :
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From your experience, which of the following parameters could be set as the most sensitive parameter that will significantly affect crop productivity (justification is recommended):
Sowing Date
Improved Seeds
Diseases & insects
land preparation
Climate (suitability for region)
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I. Internal factors
Genetic factors
The increase in crop yields and other desirable characters are related to Genetic make up of plants. • High yielding ability • Early maturity • Resistance to lodging • Drought flood and salinity tolerance • Tolerance to insect pests and diseases • Chemical composition of grains (oil content, protein content ) • Quality of grains (fineness, coarseness) • Quality of straw (sweetness, juiciness).
The above characters are less influenced by environmental factors since they are governed by genetic make-up of crop.
2. External factors
A. Climatic B. Edaphic C. Biotic D. Phsiographic E. Socio-economic
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Happy New Year! I need help.
I have missing values in the emission (panel) data and they have been replaced by rnormal(sample mean, sample sd). Unfortunately, sd is large that these missing values are replaced with negative values. Since the emission can't be negative, I want to re-replace these negative values with rnromal(sample mean, sample sd) until they are replaced with positive values. Unfortunately, the loop stops after replacing negative values a single time.
Just to let yall know that although it may sound as if I am trying to fabricate data, it is not the case here. I am simply trying to see how drastically different the tsplot would be with "complete" data when compared to the original data.
The following is my code:
tsset id date, daily
tsfill, full
foreach var in emitCOD emitDUST {
egen `var'mean = mean(`var'), by(Province)
egen `var'sd = sd(`var'), by(Province)
tsset id date
bysort id: carryforward `var'mean, replace
bysort id: carryforward `var'sd, replace
gsort id-date
bysort id: carryforward `var'mean, replace
bysort id: carryforward `var'sd, replace
forvalues i = 1/2 {
gen `var'_`i' = `var'
replace `var'_`i' = rnormal(`var'mean, `var'sd) if `var' == .
while (`var'_`i' < 0) {
replace `var'_`i' = rnormal(`var'mean, `var'sd)
if `var'_`i' >= 0 {
continue, break
}
}
}
}
Thanks.
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Can you use a different software? Is that an option?
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I'm looking to match a dataset I have assembled with patents and patent citations six years out from their date of application following Phene and Almeida (2008). Given that these variables are very common in strategic management literature, I'm surprised that this is so complicated. I have the firm name, GVKEY, and CUSIP identifiers. What is the best source for the date of a patent's application, the firm it was assigned to, and its citation count excluding self-citations? Thanks in advance for any help you can provide.
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Web of Science
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The best mean separation to use after post hoc test.
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I do agree with Yadunath Bajgai
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I kept the Strepto bacterial extract in the refrigerator for 6 months. I wanted to ask if it can still be used or not.
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What compounds that you need to get it from bacterial extract, the extract can be used fresh or directly after extraction process so it's active when you test it.
You can test the extract that you prepared .
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I am a cyto. prep. tech and I am having a major issue with my Hologic Cellient blocks. When I remove the filters from the wax/sample button a lot of the sample is stuck to the filter. The sample that stays on the button is "chunky" and not in a nice clean single layer of cells. Our paraplast is close to its expiration date and I was wondering if that could be the problem? Has anyone else experienced this issue?
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Hi there,
We also use the Cellient in our cytology lab. The answer i am about to give you is based on my experience of using the machine and i don't claim to be an expert! Two things i am thinking of...
your sample in the photo looks quite bloodstained, do you wash your cytology sample with cytolyt prior to making the cell block if it looks bloodstained?
Also i have found that if i get a lot of requests for cell blocks in one day, the machine may be used for long periods of time as it can only do one sample at a time. i have found that if i let the machine rest for at least 10 minutes, the pellet doesn't stick to the filter as much and is easier to remove. if i process one sample after another without letting the machine rest/cool down, the filter is difficult to remove and some of the pellet sticks inside it.
I hope this helps, or maybe you have resolved your problem as this was posted some months ago :)
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Hi,
I have time series data in annual frequency but the financial year for dependent variable ends at december each year whereas for independent variables it ends at june. Should i go with the regressions or is it requires some treatment?
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The series are all annual but whereas the financial year ends in December for dependent variables and in June for this independent variables. You can go ahead with the regression of each dependent variable on each independent variable. The regression can as well be interpreted accordingly.
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I bought a pack of agar plates and stored them in the refrigerator for 2 months. I forgot about them and learned that today is the expiration date. How can I dispose them properly at home? Can I simply throw them into a plastic bag? I also want to know if I can still use them even it's past their expiration date.
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In addition to Pierre Béguin answer about disposal (I agree that if they are not contaminated and normal media then you can just discard). With regard to your second question about expiration date, again it depends upon what they are. If just normal growth media then the plates should be fine so long as they aren't dried out or aren't contaminated. However if they are antibiotic plates or have unusual additives (growth factors etc) then those additives might no longer be as effective after expiration. But I think a week or two would not be an issue, expiration dates are very conservative.
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Because if these journals are open access then all researchers upto date about research. Due high rate of access or subscription, publication will be useless for all scientists.
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Dear Rai Singh ,
I see I think I got your point. Either the high subscription fee (for subscription-based journals) or high APC (for open access) makes the papers or the submission of manuscripts less accessible. This is indeed a problem that the ‘open access movement’ (so far) didn’t resolve.
As indicated by Wolfgang R. Dick there are more discussions about this. In essence it is because scientific publishing was/is a profitable business. For example, Nature offers an open access option for a staggering 9500 USD. They give arguments for this, but it is in essence to ‘protect’ their profitable subscription-based model as long as possible. Interesting read can be found here: https://www.timeshighereducation.com/blog/natures-oa-fee-seems-outrageously-high-many-will-pay-it It boils down to well… because they can.
There are countries like Germany and my own country (the Netherlands) were ‘in the ideal world’ the APCs are covered by the universities (and other research institutes) either by their own resources or by funding where there is an allocated budget for covering the publishing costs. In a same where the ‘richer’ universities had licenses for giving their researchers access to all the major subscription-based journals (and publishers).
The whole idea was that the (increasing) amount of money spent on licences and subscription fees will more and more be replaced by some sort of compensational financing for covering the APC costs (since at least in my region it is a political wish to make all science free accessible to anyone interested and hidden behind a paywall. As often…politics didn’t think the whole thing through that well).
What we see is that the big players (like Elsevier) want to protect their profitable business and they try to keep their dominant position. Besides interventions on a governmental level, I guess that small initiatives to start publishing activities where open access is offered for free on the long run might be able to ‘normalize’ the scientific business and makes it all a bit less of a business.
Best regards.
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Hello everyone. 'I am running 8 days simulation at 9km resolution for a single domain. But when I try to generate my own be.dat the following error appears at gen_be_stage3.chi_u.log and gen_be_stage3.t_u.log. Any ideas on how to correct it? I have checked my eta level and arranged all the data accordingly. Does my timescale have some to do with it? All the other stages, including the other parts of stage3 and stage4, runs without a problem. The program stops when running gen_be_diags.exe with the following log file:
##gen_be_stage3.chi_u.log
Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG IEEE_DENORMAL
---------------------------- FATAL ERROR -----------------------
Fatal error in file: da_eof_decomposition.inc LINE: 40
Error in decomposition, info = 39
----------------------------------------------------------------
[1] Initialize namelist variables and other scalars.
Computing vertical error statistics for dates 2021071700 to 2021072412
Interval between dates = 12hours.
Number of ensemble members at each time = 1
[2] Process fields for variable chi_u
Processing data for date 2021071700, variable chi_u and member 1
i, j, k dimensions are 214 214 40
Processing data for date 2021071712, variable chi_u and member 1
Processing data for date 2021071800, variable chi_u and member 1
Processing data for date 2021071812, variable chi_u and member 1
Processing data for date 2021071900, variable chi_u and member 1
Processing data for date 2021071912, variable chi_u and member 1
Processing data for date 2021072000, variable chi_u and member 1
Processing data for date 2021072012, variable chi_u and member 1
Processing data for date 2021072100, variable chi_u and member 1
Processing data for date 2021072112, variable chi_u and member 1
Processing data for date 2021072200, variable chi_u and member 1
Processing data for date 2021072212, variable chi_u and member 1
Processing data for date 2021072300, variable chi_u and member 1
Processing data for date 2021072312, variable chi_u and member 1
Processing data for date 2021072400, variable chi_u and member 1
Processing data for date 2021072412, variable chi_u and member 1
[3] Calculate eigenvectors and eigenvalues for variable chi_u
Calculate eigenvectors and eigenvalues for bin 1 of 1
---------------------------- FATAL ERROR -----------------------
Fatal error in file: da_eof_decomposition.inc LINE: 40
Error in decomposition, info = 39
----------------------------------------------------------------
###gen_be_stage3.t_u.log
Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG IEEE_DENORMAL
---------------------------- FATAL ERROR -----------------------
Fatal error in file: da_eof_decomposition.inc LINE: 40
Error in decomposition, info = 39
----------------------------------------------------------------
[1] Initialize namelist variables and other scalars.
Computing vertical error statistics for dates 2021071700 to 2021072412
Interval between dates = 12hours.
Number of ensemble members at each time = 1
[2] Process fields for variable t_u
Processing data for date 2021071700, variable t_u and member 1
i, j, k dimensions are 214 214 40
Processing data for date 2021071712, variable t_u and member 1
Processing data for date 2021071800, variable t_u and member 1
Processing data for date 2021071812, variable t_u and member 1
Processing data for date 2021071900, variable t_u and member 1
Processing data for date 2021071912, variable t_u and member 1
Processing data for date 2021072000, variable t_u and member 1
Processing data for date 2021072012, variable t_u and member 1
Processing data for date 2021072100, variable t_u and member 1
Processing data for date 2021072112, variable t_u and member 1
Processing data for date 2021072200, variable t_u and member 1
Processing data for date 2021072212, variable t_u and member 1
Processing data for date 2021072300, variable t_u and member 1
Processing data for date 2021072312, variable t_u and member 1
Processing data for date 2021072400, variable t_u and member 1
Processing data for date 2021072412, variable t_u and member 1
[3] Calculate eigenvectors and eigenvalues for variable t_u
Calculate eigenvectors and eigenvalues for bin 1 of 1
---------------------------- FATAL ERROR -----------------------
Fatal error in file: da_eof_decomposition.inc LINE: 40
Error in decomposition, info = 39
----------------------------------------------------------------
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My model is not outputting the results I expected. I don't quite know my way around ANN. After learning how to use SupervisedDBNClassification from https://github.com/albertbup/deep-belief-network I decided to try SupervisedDBNRegression using the dataset located here https://raw.githubusercontent.com/Honeson/ANN-qos_qoe/main/QoS/qosqoeNew2. During pre-training stage, I get errors less than 0.05 but get losses up to 1468356 during the fine-tuning stage. My outputs are usually the same exact value. I tried changing the learning_rate, normalizing the date, e.t.c, according to the solution here Neural Network Always Produces Same/Similar Outputs for Any Input but to no avail, I keep getting from nan outputs, to all outputs being the same or in classes like in classification problem. A portion of the code to see what I have tried is here.
X = df[columns] Y = df['StartUpDelay'].values # Splitting data X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=0.2, random_state=1337) # Data scaling min_max_scaler = MinMaxScaler() X_train = min_max_scaler.fit_transform(X_train) # Training regressor = SupervisedDBNRegression(hidden_layers_structure=[100], learning_rate_rbm=0.05, learning_rate=0.1, n_epochs_rbm=20, n_iter_backprop=100, batch_size=16, activation_function='relu') regressor.fit(X_train, Y_train) # Test X_test = min_max_scaler.transform(X_test) Y_pred = regressor.predict(X_test) print(Y_pred) print('Done.\nR-squared: %f\nMSE: %f' % (r2_score(Y_test, Y_pred), mean_squared_error(Y_test, Y_pred)))
I expect to get Y_pred such as 1002, 1653, 2764, 1121, 2112, 1452, 1324, 1331, etc but I rather got values like nan, nan, nan, ..., nan or values like 1456, 1456, 1456, 1456, ..., 1456, or values like 1111, 1222, 1333, 1111, 1222, 1333, ..., 1111, 1222, 1333.
I will appreciate detailed help as I don't quite know ANN very well. Thanks in advance.
Edit 1: I changed the learning rate again from 0.01 to 0.00001 and I got different values for the Y Predicted but quite bigger than expected result. I also got absurd metrics as
R-squared: -37862.875097
MSE: 56730616135.090736
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George Mengov Thanks again. It happened that multicollinearity was affecting my features. I removed that using VIF and the performance was awesome. In the end, I got an error of less than .05 and R squared of 1
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How can we capture images just like in the following link? The image is an aerial view of the biomass burning events and seems cloud-free, and I can get a sense of 3D although it is 2D.
Any suggestions would be highly appreciated.
Many thanks.