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As you know, there is several standards for oxidized bitumen specification, ( e.g. performance grade , viscosity grade , penetration grade). Now I want to access china bitumen standards. Thanks all
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ASPHALT INSTITUTE, AASHTO, employees certainly have.....Please find some contacts. It is the Fastest Way. Also, you can contact colleagues from China Asphalt Institute.
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Many people live in urban agglomerations, in large or small towns or in the countryside.
If you function in a city, I address the following question to you:
Is zero-emission urban public transport communication being developed in your city?
If so, what kind of urban, public, accessible zero-emission transport modes are being developed?
Please reply,
Thank you very much,
Greetings,
Dariusz Prokopowicz
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The company i work for are developing a bi-mode battery/ 3rd rail (650VDC) train capable of running on battery power for an extended period. They will operate in Merseyside England from mid 2023.
This will allow the network to be expanded without the installation of 3rd rail that comes with inherent safety dangers.
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What fuel will transport ships be powered by in the future that will be an important part of green, zero-emission transport and an important factor in a sustainable, green economy?
Will sailing ships make a comeback? There are already sailing ships being built that are also powered by electricity from photovoltaic panels. Will transport ships under green transport technology also be powered by electricity from photovoltaic panels? But will nuclear or engine-based technologies powered by burning hydrogen in oxygen become dominant?
What is your opinion on this?
What do you think about this topic?
Please reply,
I invite you all to discuss,
Thank you very much,
Regards,
Dariusz Prokopowicz
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I believe photovoltaic panels because not all nations (example Italy) have nuclear plants
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I am PhD student in transportation sciences.
I deal with the application of machine learning to solve transport problems. Examples:
  • Price prediction for road transport of goods (regression)
  • Prediction of the demand for road transport of goods (regression)
  • Prediction of diesel consumption in trucks (regression)
  • Prediction of the occurrence of a road accident (classification)
Works using:
  • Python
  • Pandas, NumPy, Scikit-Learn, Matplolib, Seaborn
  • Jupyter Notebook
Machine learning is not my primary discipline (it is <2 years in ML, 8 <years with transport and logistic)
What is the appropriate and recommended place for a scientific internship in machine learning?
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If you have a sample of Transport Vision Statement, please send me.
Thanks so much
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Dear Mr. Sagha!
I assume you refer to transport infrastructure investments - these have visions to reach:
1) Zubala, T. Effect of transport infrastructure development on selected components of the environment of inner-city river valley and the possibility of its revitalization (Lublin, Poland). Environ Sci Pollut Res (2022). https://doi.org/10.1007/s11356-022-18964-y Open access:
2) Givoni M, Perl A. Rethinking Transport Infrastructure Planning to Extend Its Value over Time. Journal of Planning Education and Research. 2020;40(1):82-91. doi:10.1177/0739456X17741196, Free access:
3) A case-study: Transport Plan to map vision for transport infrastructure to 2050, Hampshire Country Council, free access:
Yours sincerely, Bulcsu Szekely
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In non-local measurements, we apply current between two leads and measure voltage on different leads away from the current leads. to calculate resistance, do we need to divide the non-local voltage by current - as such current is not flowing through the voltage leads?
can you please suggest good literature on non-local measurements?
Thanks
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Dear Shalu Pathak, in addition to all the interesting answers,
To understand the role of nonlocality between the current ja(z) and the electrical field applied Eb(z´) to a normal metal, i.e.,
ja(z) = (integral from 0 to infinite) K(z,z')ab Eb(z´)
where the radius of the kernel K(z,z')ab ~ l (the mean free path) please review section 3 of the classical work:
Best Regards.
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Need some suggestions for good journals in the transport research/ transport dynamics area (particularly about transport emission models) that publishes an SLR or bibliometric analysis paper. Please suggest some journals with no or low APC.
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Hi Huma!
Please, check this link
There is a list of journals related to transportation. Also, try to check this one
Have a nice day
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Is there a relationship between roads and slums forming?
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I studied the geometry of roads, but did not do a direct study of slums. The classical work about fractals is Mandelbrot, Benoît B. (1983). The fractal geometry of nature.
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"THIS IS AN ABSOLUTELY SCIENTIFIC QUESTION"
The human being's passion for automobiles is something incredible, but also complicated.
There are countless reasons to make a human being like a car, nor do I intend to discuss here what each one likes most. This passion for car almost always does not let us see clearly and rationally use and acquisition of a vehicle.
However, several studies show that vehicle is almost always underused for its intended purpose, which is actually walking and transporting. Almost your time is spent just standing still and parked (see figure).
Tell us, after seeing figure, in your scientific opinion if shape we have chosen is really useful?
PLEASE ANSWER IN ENGLISH ONLY.
VERY IMPORTANT: Participate only if you are original, be yourself give your opinion, do not put links or texts from "Genio Google" or things found out there on the web! No one has any interest in stupid web answers, if that's the case, please be so kind as to ignore this debate! Also, don't post your hurts and hates, and don't deviate from the subject at hand, thanks.
SOURCE LINK:
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In the future, by changing the public transport techs and types fundamentall, maybe using the vehicles will decrease.
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I hope everyone is safe and healthy.
The purpose of this survey is to study travel behavior during COVID-19. It does not ask for any personal information and will take about 10 - 15 minutes.
Your response will be highly appreciated.
Edit: Thanks everyone for your responses. They survey is now closed.
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Please, can you open the survey again for us to respond. This is a very important aspect that we all need to participate in. Please, can you send me the survey to respond to. Thanks.
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Dear All, within our new European project SYN+AIR related with the air transport we are executing an online survey which aims at identifing the mobility choices related to and from the airport. We are glad to invite you fill in the survey https://ec.europa.eu/eusurvey/runner/SYN_AIR_Traveller_Survey_2021 The questionnaire is available in 5 languages (English, Greek, Spanish, Italian, Serbian) and lasts approximately 10 minutes. All adults that travel or used to travel by plane (before the Covid-19 pandemics) can answer this survey. You may find information related to the project at http://syn-air.eu/
Please, feel free to share/disseminate this request. Thanks a lot for your attention and contribution. #SESAR #H2020 #SYN+AIR
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Dear Prof. Ottomanelli!
I have filled in the survey, you posted. It was a nice experience. May I kindly recommend you a B2B - platform - the registration is for free, and there are many free of charge webinars, etc. resources you might benefit from:
3) A recent webinar: Patrick Keliher, Regional FAE Manager (RTI) and Maxx Becker, Field Application Engineer (RTI) (2021). On the High Speed Data Line: Accelerating the Evolution of Rail Transportation, March18 2021, Please see further details at: https://www.brighttalk.com/webcast/18279/473029?utm_source=brighttalk-portal&utm_medium=web&utm_content=transportation%20&utm_term=search-result-2&utm_campaign=webcasts-search-results-feed
Yours sincerely, Bulcsu Szekely
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As per a latest report, 22 of world’s 30 most polluted cities are in India. What strategies need to be adopted to bring down this number to say half (11) in the fastest possible timeframe.
For example, strategy could be like stopping all new construction activity within the polluting city, shifting all no strategic offices to rural areas, fixing the allowed population density per unit area, shifting of airport traffic etc.......Please give suggestions in this context.
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There are various types of pollution, so each one or combination may take a specific survey or inventory, and assessment. Some of the various types may include solid waste, sanitary waste (human, animals, pets, etc.), industrial wastes, air pollutants, water pollutants, soil pollutants, etc. Coming up with a working proposal would probably necessitate involvement of leaders, community, landowners, and others interested, such as industry, hospitality such as hotels, citizens, etc. Leaders might include political representatives, health, religious, agencies, police or enforcement, various technical pollution experts, etc. Funding to develop comprehensive plans, improvements and management as well as monitoring may be another important area to address. Plans or programs might be developed to help address specific types of pollution, or circumstances, and some of these might be voluntary citizen responsibilities, and some might be legalized or regulated, and funded by taxation, communities, industries, or government actions.
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We have seen a stability in the supply chains of goods, food in particular, during the current pandemic of Covid19 continue, mostly undisturbed.
It is very reassuring at a time of uncertainty and macro-risks falling onto societies.
How much do we owe to the optimised management and supervision of Container transport, and multimodal support to it with deep sea vessels, harbour feeder vessels, trains and trucks/lorries?
What is the granularity involved? Hub to hub, regional distribution, local delivery?
Do we think that the connectivity models with matrices, modelling the transport connections, the flows per category (passengers, freight, within freight: categories of goods), could benefit from a synthetic model agreggation of a single matrix of set federating what has been so far spread over several separate matrices of numbers?
What do you think?
Below references on container transport, and on matrices of sets
REF
A) Matrices of set
[i] a simple rationale
[ii] use for containers
[iii] tutorial
B) Containers
[1] Generating scenarios for simulation and optimization of container terminal logistics by Sönke Hartmann, 2002
[2] Optimising Container Placement in a Sea Harbour, PhD thesis by by Yachba Khedidja
[3] Impact of integrating the intelligent product concept into the container supply chain platform, PhD thesis by Mohamed Yassine Samiri
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Follow
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How to find out the trapping phenomenon for peristaltic transport of non-Newtonian Herschel bulkley model
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Nice question I wana answer also
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Hello, colleagues,
Planners and researchers in the area of transportation could help me answer this question. My research project is about Park and Ride (P&R), which is a modal shift point from private vehicles to public transport. This means that a percentage of the trip is made by private vehicles, parking the vehicle, and transferring to public transport to reach the destination. My goal is to simulate all this under traffic conditions. I would like to know what simulation software and possible results I could obtain by simulating this system, known as P&R. What is important to simulate: time, distance, utility functions, public transport timetable, P&R demand. Your contribution is a great help in the project that I' m doing.
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Greetings there,,
I assume this might help u..
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I start working on research about international air transportation and the spread of COVID-19, and I need urgently the network of global Airlines.
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Thanks all, I got it from https://openflights.org/data.html
and I created a database of Air transport.
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Although life has gradually returned to normal, many people are still concerned about the use of public transportation and aircraft. Are public transport and airplanes really the biggest means of transmitting the COVID 19 virus?
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one of the biggest though.The major means of transmitting COVID-19 are subtle/hidden and unrecognized angles. Door handles,surfaces in shops, POS machines etc
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I want to explore daily passenger volume at railway stations in the selected region.
Should I take into account the number of people getting on the train or getting off the train? Maybe the sum of passenger getting on and getting off the train at particular railway station? Is this correct in this case? I will count double passengers who commute to work and come back from work in the same day. Maybe the average number of passenger getting on and getting off the train?
Best regards,
Wojciech Jurkowski
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if you are interrested in the number of passengers using a particular railway line, then you should sum all boarding or alighting passengers at all line stations to get the demand of this line.
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Hello,
Is there a reference where can I study the step-by-step derivation of the two-group interfacial area transport equation by Ishii?
Thank you,
EB
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Rafael Ramirez-Zetina , yes I do have it and I also have the book from Ishii and all the other articles he published. But there is no detailed explanation of the derivation process which is what I need.
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I am looking to characterise both the transport systems (e.g. public transport networks, road networks, costs of travel, service reliability, etc.) and land system (e.g. urban density, land use, urban form), in any way possible at a national level. Naturally this will be very high level.
Is anyone aware of such type of metrics?
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I agree with Feng, it is not possible to do it at national level (also depend on country). Each city has different density and land use, different needs of transport like some may be suitable for BRTS, some for metro or some needs only satisfied with city bus system. Also the paying capacity will be different in different city depending upon metropolitan area or small city.
At national level (individual for country), it is possible to come up with some thumb rules like with such urban density and land use, we can propose such transportation mode or combination of modes etc.
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Could anyone tell me that where can I find an analytical solution of diffusion equation (PDE) with 1D zero flux boundary at outlet? I need this for calculating rock permeability from pressure diffusion.
I have found there are some literatures giving solution in a semi-inifinite domain. What I want to get is an analytical solution in a finite domain with at x=0, c =C0 and at x =L, flux = 0.
Thank you.
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The following "Classic" books can help you for sure:
1- As said above by Pascale: Conduction of heat in solids by Carslaw and Jaeger.
2- The mathematics of diffusion by John Crank.
3- Cannon JR (2008) The one-dimensional heat equation, encyclopedia of mathematics and its applications. Cambridge University Press, Cambridge.
4- van Genuchten MT, Alves WJ (1982), Analytical solutions of the one-dimensional convective–dispersive solute transport equation. U.S. Department of Agriculture, Technical, Bulletin No. 1661, p 151.
5- A. D. Polyanin and V. F. Zaitsev, Handbook of Exact Solutions for Ordinary/Partial/Nonlinear Differential Equations, 2nd Edition, Chapman & Hall/CRC Press, Boca Raton, 2003 
(Last one is a series on books)
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Several simulation studies show that the MCNP code fails when dealing with detailed physics at nanometric level (e.g., when modeling B4C nanoparticles in neutron shielding materials).
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Dose MCNP6 work at nano scales? is Kerma approximation valid ? How about electron cross sections in MCNP at nano metric scales? could a user use MCNP tallies for nano dimension particles? If you have access to related references please introduce here.
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Hi experts,
I wonder if there is a possibility to seal well plates for cell culture in a sterile environment in way that liquids can remain in the well plates? Something like vacuum packaging where the lid is packed separately?
We have a hydrogel which should not dry out and ideally is immersed in buffer all the time. Now, we cannot transport the well plates far, since there's leaking of the liquid from the plates if tilted.
Sterility must be maintained.
Thank you very much!
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Hi Marcus,
my first guess would also have been parafilm + the lid of the dish.
However, one question would be what size your plates have and how far you need to transport/how long you need to store them. Sealing small wells with 2 layers of parafilm, fixing the parafilm afterwards with the lid and storing in the fridge worked well for me.
I used to use parafilm as sealing a lot for flow chambers and had never any issues with sterility (sprayed it with EtOH and dried in the flow cabinet).
Katrin
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Hello,
I am currently researching the RoRo market in Norway. Looking for any information regarding market - competitors, analysis, trends, routes and so on.
If anyone could support I would feel extremely obliged.
Thanks,
Jedrzej Tadrzak
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Hi,
when it comes on market intelligence in the various sectors of RoRo shipping, SHIPPAX (https://www.shippax.com/) from Halmstad is the best. Their database and annual reports provide all necessary information. Furthermore, Clarkson and Drewry deal with the car carrier market.
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I first state that my domain of interest lies in the understanding of distances in the spatial, geographical domain. This does not involve distances in statistical non-spatial analysis.
Distances in the mathematical sense are characterised by the properties of positivity, separation, symmetry and triangular inequality. In the literature this last property is often wrongly interpreted. I state the hypothesis that the triangular inequality (d(AC) <= d(AB) + d(BC) whatever B) has for main purpose to guarantee the minimal nature of distances. I have so far listed three errors:
1. confusion with with the non-euclidean nature of geographical distances : the fact that distances are not following the straight line is accounted for triangular inequality as in Müller 1982 ("Non-Euclidean geographic spaces: mapping functional distances" Geographical Analysis vol 14). This is clearly a misunderstanding of the non euclidean nature of the transport and mobility realities.
2. considering non-optimal sets of measures (the word "measure" is used to avoid considering them as distances) containing triangular inequalities as in Haggett 2001 p 341 ("Geography a global synthesis" Prentice Hall). This argument is not consistent with the idea of minimality that I mentioned earlier: what can be a sub-optimal distance? Does it exist in spatial analysis of transport such distances?
3. the existence of rest-stops along transport routes creates the possibility that the additivity of time-distances (for instance) is not guaranteed. On the optimal route from A to C passing through B, if there is a need for a stop (for rest, for energy refuelling or other similar purposes) in or around the point B then the addition of time-distances AB and BC is inferior to the overall AC distance creating an apparent violation of the triangle inequality. This idea can be found in the reference article Huriot, Smith and Thisse 1989 "Minimum cost distances in Spatial Analysis", Geographical Analysis, p 300. This argument could be surpassed by using a non-continuous time-distance function to overcome the sub-additivity paradox.
All this discussion brings to the idea that distances are optimal in nature, and that in the spatial analysis of transport and mobility, the concept of distance contains an idea of optimality. This idea could link geography and economics through the principle of optimisation in the distribution of activities and the functioning of transport systems.
I would like to open here a discussion to test if my reasoning is consistent and solid: I welcome any counter arguments, examples, illustrations.
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" All this discussion brings to the idea that distances are optimal in nature, and that in the spatial analysis of transport and mobility, the concept of distance contains an idea of optimality. This idea could link geography and economics through the principle of optimisation in the distribution of activities and the functioning of transport systems "
Interesting work ..... you are probably aware of the fact that the solution to a linear programming "transport problem" links activities with transport systems, and provides a set of prices (dual variables, or shadow prices) that relate to, and are derived from, the transport costs --- those transport costs do not have to obey the triangle inequality.
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Hello,
I will need to implement Transport Mode Detection (TMD) on a smartphone accelerometers, gps, etc. in order to detect if the user is traveling on foot, on bicycle, by car, by bus, etc. Here are my two questions:
1) Is there some public data available to train and benchmark algorithms for this task?
2) Is there some commercially usable libraries/services implementing TMD? Something under MIT licence would be great but commercial solutions could also work.
Thanks for your time,
Bruno
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I found the Sussex-Huawei Locomotion Dataset
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Let the concentration of tracer in the sand column experiment be c´ and the velocity with which it is being injected is v. So the influx of tracer in the column would be -vc´ (negative sign to denote influx)
My question is which inlet boundary condition should be applied? 1st type or 3rd type?
With 1st type condition at the inlet C= c´,
the same concentration as the experiment can be ensured, but the influx will be higher than actual experiment as
Model influx: D∇c´−vc´
Experimental influx: -vc´
But if 3rd trype boundary condition is applied i.e
(D∇C−vC)⋅n= -vc´
The same flux condition as the experiment can be ensured, but the inlet concentration will be lower, untill diffusive flux becomes zero.
In that case, which boundary condition should be applied?
Thanks in anticipation
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If you're measuring flux averaged concentrations at the column outlet, as is typically assumed, you should use the first-type BC at the inlet. See van Genuchten and Parker, Soil Science Society of America Journal, 703-708, 1984 for a full discussion.
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One of the most important parts of my project is the recognition of other countries' successful logistics experiences. In this regard, one of the most important issues is the achievement of reference models and business processes for logistics and transportation. The process flow diagrams are in the form of BPMN standards. Can you guide me in this regard?
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I really apprereally it.
Of coruse I prefer your professioanal experience and value it.
Best regards.
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In the case of gas transport through microporous membranes (e.g. silica membranes), there is a temperature dependency behavior which affects the membrane performance at high temperatures. We know that it happens when kinetic diameter of the molecule approaches the pore diameter. I have read somewhere that LJ potential might plays big role in this.
Could anyone provide some information, text books or researches containing detailed description of this phenomenon?
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@Prem_Baboo
I truly appreciate you.
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How can I check if greater levels of accessibility inevitably result in greater participation in activities or more mobility?
What methodology can I use? What are the most appropriate accessibility measures?
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You will need to closely define your term accessibility.
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I am developing my thesis on social exclusion and social justice related to transport. I would like to do some spatial analysis comparing socioeconomic and demographic data with travel behavior.
I intend to do this using the R programming language. Also, my knowledge of statistics is a bit out of date. Can you recommend an online course where I can learn spatial statistics using R programming?
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Hello,
Here is link to online book "Forecasting: principles and practice". The book uses R language
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I am currently conducting research (my master thesis) on social justice and social exclusion related to transport. My research hypothesis is whether greater levels of accessibility inevitably result in greater participation in activities or more mobility.
In this way, I would like to read articles that have already studied this relationship.
An article I found on the subject is
"Fransen, K., Farber, S., Deruyter, G., & De Maeyer, P. (2018) The spatio-temporal accessibility measure for modeling activity participation in discretionary activities. . "
Could you suggest me more papers on the subject?
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Thank you for you answer Bryan. I have already looked at these terms on some scientific basis, such as scopus, science direct and webofscience. Most work on the subject assumes that more accessibility results in more mobility and participation in activities. I would like to find specific papers that have tried to verify if this assumption is true.
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I would like to find a way to build a model of the system I'm starting to research. Or really find any small amount of progress. Here's a snapshot of what's happening: Air is flowing (from atm.) through a porous media in what should be a vacuum chamber. I'm not concerned right now with why or eliminating the flow. I just started this in the last 2 days so I know very little and I'm still waiting to get some info from my peers. Rather sit and wait I want to try and see if I can get a leg up on some basic theory and possibly explore any similar mathematical models. I believe my peers want to characterize the flow so they are able to predict the behavior.
I am an undergraduate student and have taken an intro fluid mechanics class so my background is not in depth. I've been looking at some books and journal articles. They are okay but I'm just kind of aimlessly picking them.
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Hi
Air is fluid and has momentum principal when transfer, so you study about "Bernoulli,s low" and "friction loss" of gases specially air (Wright formula and Loeffler formula base on Weisbach formula)
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Hello fellows,
I'm planning to import a cell line (frozen vials on dry ice) from USA to Poland does anybody have experience / knowledge about courier company which will cost less than Fed Ex, TNT and World Courier (their service prices are much bigger than cell line cost)?
Thanks in advance
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Why don't you order it from Amazon in Poland, the same material, maybe with little less cost you can find in Poland. as i have to send once the data router, which size was almost (3m*4m*.8m), from Germany to Denmark, the original cost of this router was around 230 Euros (Brand new), and I want to sell the use on 65 each, the courier charge me 47 euro for one packet/parcel. so just suggestion sell the same stuff on Amazon and order the same device/material from Poland, you will save a lot.
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I'm exploring non linear modelling technique for demand forecasting in transportation sector where alternative transport mode implement.
As a start it is good to have some ideas from you
Thank you
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I have been doing what you seem to refer to as non linear modelling in transport demand analysis since 1975. More formally, the issue raised is that of the proper form of variables (and sometimes of functions) and I have adressed it with Box-Cox transformations, both direct and indirect, as you will see from three enclosed documents pertaining both to models of levels (generalization of classical regression) and logit models (discrete or aggregate) and to various algorithms to estimate the parameters and derive meaningful statistics from them. If you have questions after looking at those (available on ResearchGate in any case, but enclosed for convenience), let me know.
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How much the size of spatial area affects traffic generation within the area and the resulting traffic volumes in the relevant city (public transport or individual transport)?
Is there any method of theoretical approach how to describe this issue?
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So, you are looking for a direct link between traffic and area extension. At the best of my knowledge this issue has not been investigated. Traditionally, I would refer to 4steps modelling approach instead gravity model. For you pueposes, gravity models should work only if the population ans /or other attributes are uniformely distributed.
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Transit Oriented Development areas are located within radious of one 1/4 to 1/2 mile (400-800 m) What do you think what is the optimal distance from housing development to railway station? What is the difference between urban and rural areas?
Best Regards,
Wojciech Jurkowski
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Research conducted over the years in California has found that walking distance depends on whether it takes place at the origin (residential) end of a trip or at the destination (employment or other) end. Cervero found, for example, that walking distance from rail station to office followed a steeply dropping curve; offices adjacent to rail stations saw 20-30% of employees arriving by rail; at 100m, that figure was about 15%; at 250m it was down to 5%, and at 400m it was down to 2.5%, an order of magnitude difference with adjacent properties (it is worth noting that no mode choice component of any Regional Travel Model in the US with which I am familiar bothers to take these differences into account; the San Diego model, for example, assigns a single average walking score to any employment site located within a Transportation Analysis Zone whose centroid is within a specified straight-line distance from the station, leading to gross distortions in ridership projections).
The question, here, though, is about residential access. Other research in California, I recall, showed a straight, gently sloping line, with maximum ridership generated adjacent to the station and ridership declining until a distance of about 800m. Additional research has shown that people report a willingness to drive up to 2 miles to access a park-and-ride facility; beyond that, willingness to drive drops off significantly.
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"It is a world trend that digital economy is merging with real economy. Through the use of digital technologies, investments and innovations take place in the fields of smart grids, self-driving vehicles, e-government, advanced manufacturing, etc. Our question whether there is any general or formalised technology which could be equally used in various fields, and which could help to achieve digitalisation in everyday life, also in the transportation."
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as a part of circular economy such transformation brings smaller, greener, flexible autonomous vehicles that impact transportation in smart cities
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When performing transport calculations using Transiesta and Tbtrans modules in Siesta, transmission curve is directly given by plotting .TRANS file with E(fermi) = 0 eV? or do we need to do energy shift to balance the fermi energy of electrodes with that of scattering region ?
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Hi, to be candid i don't know much about these software i think i want to learn from you experts. Sorry i can't contribute now.
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Can anyone give reference procedure or an illustrative example for the estimation of OD Demand matrices through CUBE.
Probably they are estimated through extension CUBE Analyst/Analyst Drive.
Input Data available to me: A prior yearly OD matrix & Traffic Counts (Not Average values)
And lastly, how are the results of output matrix. Are the results reliable and statistically significant?
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followed
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i think it is interesting if we can go anywhere in a second . do you have any idea about how we can do it?
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Never and by no means
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I have average speeds data for different road section & I would like to build an O/D matrix from it. Firstly, I need to build a relationship of speed & flow to compute flow and then to do OD estimation by using traffic counts (inverse assignment).
If anyone is familiar with the procedure. Please guide
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I have never seen a technique to successfully reverse-engineer flows from speeds. I expect that any such data is too noisy to enable you to do so with confidence and I would be very intersted in references to papers that show how and where this was done well.
As for matrix estimation from those reverse-engineered 'counts' - you would usually rely on a half-decent prior matrix of OD flows that you would adjust to the 'counts'. Without such structure the resulting matrix would not be very reliable either.
I think you are setting yourself a pretty difficult task!
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It was seen that when magnetization is in the direction of current flow, resistance is minimum and vice versa. Why resistance increases when spins are aligned and why it decreases when spins are aligned in perpendicular to current direction. According to me it should be opposite.
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Hello Vikas!
The physical origin ofthe magnetoresistance effect lies in spin orbit coupling. The electron cloud about each nucleus deforms slightly as the direction of the magnetization rotates, and this deformation changes the amount of scattering undergone by the conduction electrons when traversing the lattice. A heuristic explanation is that the magnetization direction rotates the closed orbit orientation with respect to the current direction. Ifthe field and magnetization are oriented transverse to the current, then the electronic orbits are in the plane of the current, and there is a small cross-section for scattering, giving a low resistance state. Conversely for fields applied parallel to the current, the electronic orbits are oriented perpendicular to the current, and the cross-section for scattering is increased, giving a high resistance stat. See the diagram in the figure demonstrating the physical origin of AMR!!!
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Any idea/suggestion about using molecular dynamics simulation about transport and geomechanical fate of proppants?
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LAMMPS is a good MD code for materials research.
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To whomever is considering answering,
I am currently running a modified icoFoam (added tracer transport) application in parallel on two of my computer's processors. I am coming across crash issues sometimes, where mpirun suddenly crashes with no error report whatsoever. This doesn't always happen, but what seems like out of nowhere, the application sometimes fails. It just stops at an random time step.
I would expect that if it is a memory error, an error report would appear as it is a standard issue with applications.
If you have come across this issue, please let me know what you did in circumventing this annoying issue.
Thanks in advance.
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For those who are interested, I believe the problem was largely due to the temperature buildup on my CPUs. Thus, this issue was most probably due to an automated CPU break and not an OpenFOAM based break. This can explain why no error log was projected.
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I think if we block the porins or TonB-dependent transporters? of bacteria and prevent them from transporting important compounds, we can destroy them. I appreciate if you share your experience.
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Dear Shadman,
Thank you for your answer.
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I would like to medelize heat and moisture transfer throw soils from building ground level. What physics should i use for it ?
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Please find them..so sorry..
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Dear Researcher,
I am willing to perform Spectrum Analysis of a Transport tool and I was wondering weither a Shock Signal in the time domain can be transformed to a PSD in the frequency domain by means of Finite Fourier Transform or not?
So given an amplitude of 10g over 11ms (Sock Signal in the time domain) and I wanna transfere it in the frequency domain to obtain the input PSD for Response Spectrum Analysis.
So, x(t) ist given over a finite time interval 0<t<T with an amplitude of:
X(f,T)=Real (int(x(t)*exp(--i*2*PI*f*t) dt))
then the Amplitude in the frequency domain can be determined using:
G(f,t)=2/T (abs(X(f,T)))
Best regards
Mohamed
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Dear Mohamed,
what is the transfer characteristics of the your system in frequency domain, H(jw) of your system?
Why do you want to solve the problem in frequency domain?
You can solve your problem in time domain?
From the conceptual point of view you do not need to truncate your sinc x function you can use it and multiply it by the transfer characteristics in the frequency domain H(jw).
What i tried is to approximate the sic x function to get an approximate solution.
Best wishes
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Redundancy is often considered as one of the features for resilience assessment.
What are the possibilities (or how) to incorporated this feature into the transportation network resilience analysis and assessment. The similar question can be asked for the transportation element only. Are there differences?
Thank you very much for your ideas and opinions.
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Michal,
There are actual 4 R's of resilience that you should be considering:
1. Robustness
2. Redundancy
3. Resourcefulness
4. Rapidity
In the end, resilience should be measure via a "Recovery Time Objective" or RTO and the 4 R's are simply contributors to the level of resilience achievable. The cost associated with resilience should be calculated using a cost benefit analysis when calculating the total life cycle cost. Keep in mind that "Value Engineering" is the enemy of resilience as it achieves short term gains while sacrificing a resilient and more cost effective future.
Please let me know if you have any questions.
David Vaughn
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it is not true that in-plane momentum needs to be conserved. As there is a scattering region, the momentum along the direction of transport is no longer a good quantum number.
what mean's "a good quantum number"?
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they define the quantum number as a value that is used when describing the energy levels available to atoms and molecules. An electron in an atom or ion has four quantum numbers to describe its state and yield solutions to the Schrödinger wave equation for the hydrogen atom.
There are four quantum numbers:
n - principal quantum number - describes the energy level. ℓ - azimuthal or angular momentum quantum number - describes the subshell. mℓ or m - magnetic quantum number - describes the orbital of the subshell. ms or s - spin quantum number - describes the spin.
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I will take a nasal samples for to search Bacteriophages, but i whant to take a aliquot that for a future to realize metagenomics studies, which the better method for to take this samples. The universal virus Transport medium inhibe the bacterial grow by the antibiotics present, which other buffers or transport medium can server?
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Thaks very much! Filipic
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What kind of position accuracy measures do you use to determine the positioning accuracy of GNSS receivers?
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Concerning accuracy and precision, always I saw that that most of people make confusion. In the paper from Novatel, provided by Emilio Ramirez-Juidias also there is a misunderstanding. Accuracy, by definition is composed of bias and precision, ie, systematic and random errors. And always, if the precision is not good, the same will occur with accuracy. In the figure 1 provided in the paper, one of the example is not correct. The third one, where they say High accuracy, and low precision, should be Low accuracy as well. Like defined by Gauss, long time ago, one measure of accuracy may be given by sqrt(bias^2+precision^2). In a nutshell, the problem is to think that the bias is the accuracy.
GPS can provide very high precision (cm to mm) and if all systematic errors are very well modelled, can also provide high accuracy.
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Dear colleagues!
I have some questions about modelling and predicting freight and passenger flows, calculation transport-economical freight and passenger balances and evaluation of transport infrastructure capacity in China. Do you know someone who makes researches in these fields?
Thank you in advance.
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A study was done in Lingnan College, Sun Yat-sen University, China by Huanxin Zhang and Xia Pan titled 'The Relevance of Freight Rates in Forecasting Cargo Port Volume : A Study of the Guangzhou, China Port' where they used some freight forecasting techniques. Hope you can get some help from them.
Article Reference: Jarrett JE, Zhang H, Pan X (2015) The Relevance of Freight Rates in Forecasting Cargo Port Volume: A Study of the Guangzhou, China Port. J Bus Fin Aff 4:138. doi:10.4172/2167-0234.1000138
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Hello everyone.
i want to isolate and culture bacteria from infected non vital teeth. predominantly the anaerobes are responsible for the primary infection.
my question is can i use BHI media for transporting the sample to lab and for incubation in lab?
after incubation aerobic + anaerobic in BHI for 24 and 48 hr respectively the samples will be further processed on enriched media.
Mcconkey , chocoalte and blood agar.
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Dear Hasan
If you modify BHI broth by adding cysteine (0.4 g/L), hemin (5mg/L) then you do not loss fastidious anaerobes.
Good luck
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Different smartphone use differenct GNSS receivers. What is their static and dynamic accuracy?
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Dear Prof. Specht,
your reseach meets my interests since my colleagues and me are working on smartphone's GNSS capability together with students for geodetic purposes (students project).
You asked for the accuracy of different GNSS receiver types for different manufactures. The question is: On which kind of accuracy you are interested in? Positioning? Timing? Velocity? Are you interested in the overall P-N-T accuracy? There are also important points like stability and continuity of observation types like carrier phase and code phase (pseudorange) as well as the performance of the used/installed antenna.
From my geodetic point of view it is the optimal procedure to determine the precision and accuracy of your unit out of the raw data which your unit provides.
Current Android systems (up to Android 7) support to access the real raw-data like carrier phase, code phase (pseudo ranges) and signal-to-noise (C/N0) ratio. At least the carrier phase observation is highly interesting for using smart devices as smartphones in high precision positioning. Besides of classical SPP-Algorithms (single point positioning) the carrier phases allows you to use PPP (precise point positing).
Please find a list of how to access raw data in smartphones:
Here is a very intersting aticle on how the performance of different units could be evaluated:
Beside of this, if you have access to a smartphone which is capable to store GNSS raw data, you could use a RINEX logger app:
to store observations in an independent format (RINEX - receiver indepenent Eexchange format) for further post-processing.
I really recommend the remarks of Pawel Prestrzelski.
Perhaps, clarify which kind of observation type (carrier phase or code phase) you are using and for which observation type you like to calculate the accuracy and / or precision.
as recommended by Pawel Prestrzelski please really make use of the raw measurements that your unit possible provides. The preprocessed solutions (internal position solution etc.) are in most of the cases a rough/errorneous solution or a solution with furhter conditions, which are not reported transparently. Your device could be more accurate and precise, if your data is processed with own algorithms and stochastical models where you know and can control everything.
To compare the units and to evaluate the accuracy and precision, I suppose the following procedure:
static:
  • capture data for 24 hours (maybe repeat for 2-3 days) on a fixed, static, repeatable mounting,
  • take care of the entire conditions around the smartphone (location of antenna, where is the smartphone located during measurments, buildings etc.) and take possible obstructions into account
  • compare the continuity of code phases (pseudo ranges) and carrier phases, maybe you have also access to the doppler and the signal-to-noise ration (C/N0).
  • calculate your ow position solution algorithm.
In our project we use the following method, to evaluate the quality of smart devices:
kinematic:
  • RTK-unit for reference solution
  • record observation on trajectories (RINEX) with smartpone and simultanously with RTK-unit.
  • compare online quality of both trajectories (rough test only) and post-process both trajectories while the RTK-Trajectory will be your target trajectory.
  • process form these data the precision, accury and correctness of your trajectories captures with smart devices.
....furhtermore, applications like PPP-RTK are highly interesting for such approaches.
From my experiences and point of view, the accuracy and precision of your smart devices is (1) strongly depending on the quality of the observation data delivered by the units and (2) depending on the algorithms you use, to process your observation for Positioning, Navigation and Timing (PNT).
Hopefully my remarks assist you by answering your questions.
Best regards,
tobias
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Hi,
Currently I'm working with THP-1 cells which I've differentiated to macrophages using PMA. After stimulating them with a pathogen i'm seening these ''white'' dots and it looks like the macrophages are transporting them to one another. Can someone clarify this? See picture.
Kind regards,
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Hi,
Macrophages usually form colonies when they differentiate. This is called clonal differentiation. Now certain pathogens can trigger further differentiation or maturation in macrophages after infection. I have observed that in my line of work after Leishmania infection. Infact i have observed such white spots as well. Further I had worked with a isolated mushroom polysaccharide which had also produced such white dots, coming together of macrophages after stimulation . There is no report of transporting in macrophages rather this is a colony forming behaviour. Attracting other macropahges probably with chemokines. It may be triggered by your pathogen. Also observe how PMA changes your THP-1 cells to macropahges. Look out for those white dots. It may help you stumble onto something more.
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This solutions would require an unacceptably high financial investment and delaying of the trains in stations.
An alternative solution can be:
Transportation of wheelchair users can be planned on major railway terminals, at least 30 km apart. Therefore, it is necessary to organize “door to door“ transport for the disabled in specialized vans.
What's your opinion about it?
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From an ethical point of view, I agree with Marcus, all stations should be accessible to wheelchair users. I myself am on a wheelchair; nevertheless, I believe that there is an equilibrium point between the demand of disabled or elderly people in a catchment area and the choice of supply, i.e. special van services and number of elevators to be installed. The van service could be flexible, kind of dial-a-ride service; additionally, special vans like shared taxis offer a door-to-door service. The train service is obviously more rigid but is irreplaceable for medium-long distances. It requires a movement home-to-station and another one station-to-work. However, a key constraint should be the maximum distance acceptable for a disabled person to reach a train station equipped with an elevator. In my opinion, this could be a way to find a good solution sustainable in practice
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Hello to all,
I'm going to research the surphace morphology of grain impact on two-phase gas-solids flow dynamics during fluidized bed combustion or mixing or pneumatic transport of powders. Does anyone is connected with this topic?
Best regards.
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Dear Stanisław Anweiler Sir,
Now the researchers are working on adsorption of multiple gases or gas mixture on the porous solid in fluidized bed system. As adsorption is a surface phenomenon, so the porosity, packing density, grain size and their distribution affects considerably the thermodynamic properties , adsorption amount depend upon the gas pressure. So this may be an interesting research which not only comes under tribology section , also covers energy section for current demand.
Thank you.
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I am reading some literature which says sampling should be done when soils are at field capacity. This ensures appropriate interpretation of field penetration resistance measurements, facilitates proper mixing of subsamples, and prevents soils from smearing during sampling and transport.
This makes me think what are appropriate conditions, precautionary measures and pre-preparation for taking samples from a 60 acres.
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Very good links. Information is vaulable
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For isolation of the anaerobic oral pathogen  , a medium without hemin can be used?  which medium is used for the transport of the samples and which broth is used for the culture of this  strains. Can this anaerobic bacteria grow in blood agar?
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Hi, for cultivation of oral bacteria, if you are using a swab for collection of the specimen, you can use Stuart's transport media or Robertson's cooked meat broth for transportation. Swabs from the transport media can further be cultured on Blood Agar plates with antibiotic discs like metranidazole and kanamycin and incubated in BD jars with anaerobic gas packs.
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I am looking for the gene that may responsible for metal transport in the plant (Rice) under stress condition. 
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Firstly give particular stress and then isolate mRNA  from the leaf sample through trizol reagent .this mRNA converted to cDNA by RT-PCR and then primer design for gene specific primer. First PCR through Q5 high ferdility taq polimerage.
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What do you think, which factors determine a number of passenger (railway)? Which are the most important? Population? Distance from the city centre to railway station? Could you recommend literature where authors focus on modelling and forecasting the number of passenger based on other factors?
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As far as Indian Scenario is concerned  there are many factors which contribute in traffic (Railway) congestion. A few of them are as follows:
1. Public Holidays, Diwali Holidays (Festival), vacations
2. Peak Hours (office, school and factory opening and closing hours)
3. Examinations
4. Cultural Programs, Proceedings and other religious functions
In india 4-5 % growth in trafic is observed per year, a brief report of this traffic congestion and management is atached in link. I hope this is useful for you 
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Understanding the biological roles of 4 micron infrared, 'transport DNAs', 'differentiation DNAs' and resonance is prerequisite for following my arguments. The attached summarises half a century researching the consequences of discovering 'ice XIc' in 1967. 
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Thank You for your reply sir, But i am searching for CA and MN assay for measuring aging .
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I have a long, horizontal pipe carrying liquid chlorine to be insulated. The pipe will be heated from a single line of heat trace taped to the underside of the pipe (but within the insulation). How can I calculate the minimum thickness of insulation needed to maintain a minimum pipe surface temperature of 80°F?
Parameters:
- 3/4" carbon steel pipe (schedule 80)
- Transporting gaseous chlorine
- Heat generation below pipe (per unit length) = 3 Watts / ft
- Outside air temp. of 10°F
- Need to maintain pipe surface temp. of 80°F
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Dear Alec, try to apply Newton cooling Law and Fourier heat conduction Law; you should compute overall heat transfer coefficients (using chlorine as medium); in equations the thickness is the unknown. See Y. Cengel, Introduction to thermodynamics and heat transfer, Chapters 9 and 10.  Gianluca
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I have extracted high integrity RNA and freeze-dried them for easier transport. What would be a proper method or protocol for reconstitution of the RNA. Is adding RNAse Free Water and vortexing enough? 
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Reconstitution with RNAse-free water and flipping should be absolutely fine, presuming that the RNA was previously solved in appropriate buffer (EDTA, pH 6-7).
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I know of factors like higher crowding, reduction in space, transport/ handling stress and constant but restricted feed supply. Are there any other factors that are new to the animals when they are domesticated?
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First i would like to share that wild animals are not domesticated. And when talking about controlled condition does it refer to captivity like zoo or for the purpose of research. But in both the cases i feel human interference and presence are the factors that also impact in wild animals behaviours.
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With Regards to the Sb2Te3 topological crystal what could be the reason for observing activation energies (measured in rage of 200-350 K ) higher than the energy ban gap in spite of the ohmic nature of contact. ?
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Thank u. you are mostly right as I believe. I distinguish between them because I am not sure about the value. If I said this is Eg then I must be sure. but why there is conflect btwn the thermal and optical gap. Thank u
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My problem is near to the General Traveling Salesman Problem with repetitions (General TSP-R) where some points can be visited more than once. However, the differences in my problem are:
1- not all nodes have to be visited by the salesman.
2- some nodes will be visited once.
3- some nodes will be visited more than once.
Is there any way to prevent subtour occurrence?
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@José can you please suggest some papers i can follow. 
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How one can remove capping from a thin film?
I waould like to do transport measurements, without capping it seems that the magnetic layer gets oxidized and if one uses capping then how to perform transport measurements?
Can anyone suggest how to remove the capping using any methods?
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As Victor points out it verymuch depends on the layer underneath. If simple wet etching is allowed, then a weak acid solution will remove the MgO with ease. Similarly the Al2O3 can be etched with NaOH or KOH.
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In developed countries there is a set of measures and strategies to encourage people to use river transport instead of vehicles that cause congestion.
What are these strategies?
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Past conference papers I did on Short sea shipping at the ATRF touch on this.I suggest scanning the journals "Maritime Policy and management,Maritime Economics and Logistics " .Thee are several authors who have dealt with this.
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I have thought of a method but I would like to contrast it with other experiences.
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I assume that you are talking short-term.  For the long-term – you need to do what Oliver says and completely dry your material out.
Short term, I’d do two things.  You need to dry the bugs out as much as possible.  The bugs don’t need to be completely dry – but you need to get the water content down to avoid “rot” or mold.  Two ways to do this.  Use a desiccant in an airtight container to pull the moisture content down as rapidly as possible.  You can recharge silica crystals on a stove and use them over and over again to do the initial drying stage. 
I typically air dry bugs in an open container in a warm place using an ant-proof arrangement (three beer bottles, standing in a water-filled bowl, prop up a  container with my bugs in them).  If the room is warm and there is good air movement, insects dry out pretty quickly this way.
Then you need to store your “damp bugs” in something that is air-tight with a mold deterrent like p-Chlorocresol.  This will keep material in great shape for quite a while.  I’ve consistently pulled bar codes off material stored like this for up to a month in the field.
Once you get the beetles into a controlled environment – dry them out quickly
John
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In order to know the exact CO2 footprint of  an agricultural product and  of its method of production(open field, green house,vertical farm), I need to take under account how much energy is consumed and what are the CO2 emissions during its cultivation, transportation, refrigeration and marketing. 
How much energy does it take to produce the seeds, transport them and plant them in the field, then gather the crop and transport it where it will be stored until it reaches the consumer? 
I am working on lettuce in Greece but I am interested if someone has done such a research for any location and crop. 
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I would doubt that the numbers for start to finish would be out there, because it is so dependent on locality. But here's a start: 
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As example: Drug A (Km=2uM), drug B (Km=45 uM). If we do inhibition or DDI study with known inhibitor and found IC50 for drug A is higher than drug B. what will be the explanation of the result (IC50 or Ki) for two drugs (A and B)?
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I was just having a peruse through some DMPK related questions and looked at this out of interest......I know it's a while since the question was posted but just in case it helps.......I'm no expert on enzyme kenetics but I'm not so sure you actually have an issue here, if the Km for drug A is lower than drug B would you not expect the IC of the inhibitor to be higher?  The binding of drug A occurs with higher afinity than B and therefore (without knowledge of 'K off' assuming an equal rate of transport for A and B)  would require an increased level of inhibitor to reduce transport by half in comparison to B.
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What will be the impact of public traffic management for logistics service providers?
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The impact is crucial, so much so that "public traffic managers" and "logistic service providers" should collaborate to produce a joint design proposal for the total system configuration.  Problems arise in such systems when different sub-systems are designed separately, and then "thrown together" after design decisions have been completed.  This is both foolish and dangerous.  Any part of a system whose impact on the whole will effect functionality, should be included in developing the design for the systems parameters and operations.