Maintenance - Science topic

To save media cost the base media can be diluted 1:1in dmem

Hi,

You could find it in "NASA's Open Data Portal"

Best

Answer lies in formulation of your problem, if you are placing the limits for 24 hours (short term) then both maintenance and capital cost become less in comparison to operational cost. Problem of scheduling is complex, lots of data is involved, specially when its OPF. If renewables are also considered then problem becomes stochastic again with additional methods (Monte Carlo etc.). I have never read a research paper considering all the possibilities of constraints. Better is to go ahead with: (Thermal Generators+Renewables+ Storage) in security constraint environment.

I don't have first hand information, but I would think VR will be a good way to give people an experience of driving the vehicle before buying the car.

Shaista Khaliq after source cleaning and maintenance.

Dear Juhi Naseem . There should be a comprehensive legislation to recognize live in relationships that consider each member of a family. So as each member be treated in a fair way.

Good question, indeed.

As practitioners, we always recommend to ...

1.

Define your system ("Define the Context") according to ISO 31000.

Because you need to know for which system (only) you are preparing your Predictive Maintenance Program.

How can you do that?

Please see e.g. one of our LinkedIN Posts (Post No. 16)

[https://www.linkedin.com/posts/alfred-moergeli-6919296_riskmanagement-context-activity-6686977016643756032-z3NC?utm_source=share&utm_medium=member_desktop].

2.

Define the A/B/C components of your system through a System Safety Analysis (SSA).

Because you need to know the critical parts of your system.

How can you do that?

Please see e.g. our LinkedIN Post No. 48

[https://www.linkedin.com/posts/alfred-moergeli-6919296_riskmanagement-whichsystemsareessential-systemsafetyanalysis-activity-6770644847570243584-5X3n?utm_source=share&utm_medium=member_desktop].

3.

Start to plan your Predictive Maintenance Program.

Because without a Road Map there never ever will be any kind of successful action.

How can you do that?

Please see e.g. our LinkedIN Post No. 5

[https://lnkd.in/edNdraJS]

with options for - Maintenance Plus, or - Retrofit/Revamp, or - Replacement.

How do you come along with that?

Very much looking forward to your feedback.

Thank you,

Alfred

I work with children with autism, and during the Covid-19 period we were working remotely and this had a good effect on some children in learning through the parents and the family, but it had a negative impact on others as some families do not work on training the children This training is given to both the teacher and staff. But the institution was very keen to provide the service in the best way and to the fullest and without stopping.

From my point of view, I believe that in the event of exceptional circumstances such as these, our solutions must be alternative, and the constant search for alternatives must be non-stop.But I always like to work face to face

The threshold value for an alert notification is determined by the specific criteria of the alert. Generally, this value is determined by evaluating the data that is being monitored and establishing a range of values that will trigger an alert. For example, if you are monitoring server performance, you may set an alert threshold value of 80% usage to trigger an alert when the server reaches that level.

This is a very important comment -- ChatGPT will make up fictional citations in many of its responses. Why they programmed it do this may be answered here:

Spillway is designed for the maximum flood that the structure can safely pass ‘design flood’ and is

selected after consideration of economic and hydrologic factors.

Design flood may be arrived at by considering the cost of constructing the structure to provide flood control and the flood control benefits arising directly by prevention of damage to structures downstream, disruption of communication, loss of life and property, damage to crops, and underutilization of land and indirectly, the money saved under insurance and workmen’s compensation laws, higher yields from intensive cultivation of protected lands and elimination of losses arising from interruption of business, reduction in diseases resulting from inundation of flood waters. The direct benefits are called tangible benefits and the indirect benefits are

called intangible benefits. The design flood is usually selected after making a cost-benefit analysis

and exercising engineering judgment.

Maximum Probable Flood (MPF) includes extremely rare and catastrophic floods and is usually confined to the spillway design of very high dams.

Refer to the book Hydrology by H.M.Raghunath

You can also refer to many hydraulic structures books.

At this point, I prefer to be silent.

Mostak Ahamed Thank you for the answers. Both are new equipment. One new model and one old model. We have already moved on to buy the new model.

No, it is not suitable

Dear António Brandão . See the following useful link: https://mdpi-res.com/d_attachment/sustainability/sustainability-13-13268/article_deploy/sustainability-13-13268-v2.pdf?version=1638322451

Study the attached google search. David Booth

ACI report ACI 231 Report on Early-Age Cracking: Causes, Measurement, and Mitigation is available from ACI web site. Key causes include autogenous shrinkage, drying shrinkage, and subsidence cracking, in addition to any poor design and construction issues. Proper curing is critical to avoiding early age cracking. Mitigation strategies include internal curing (lightweight aggregates or superabsorbent polymers), shrinkage-reducing admixtures, and coarser cements (see the work/advocacy of Richard Burrows in the US).

Thank you for your helpful estimation and notices!

Best regards

Bernd

Language maintenance is the maintenance of a language (usually L1) despite the influence of external sociolinguistic forces (usually powerful language(s) and language shift, is a shift, transfer, replacement or language assimilation of usually L1 to L2 due mainly to the external sociolinguistic forces influencing a speech community to shift to a different language over time. This happens because speakers may perceived the new language as prestigious, stabilized, standardized over their L1 (lower-status). An example is the shift from first languages to second language(s) such as the English language.

Social network deals with the relationships contracted with others, with the community structures and properties entailed in these relationships (Milroy, 1978,1980 &1987)

· It views social networks as a means of capturing the dynamics underlying speakers’ interactional behaviours and cultures.

The fundamental assumption is that people create their communities with meaningful framework in attaining stronger relationship for solving the problems of daily life.

Personal communities are constituted by interpersonal ties of different types, strengths, and structural relationships between links (varying in nature) but a stronger link can become the anchor to the network.

Such networks have the following characteristics, they are

Where do we find some close-knit networks? In smaller communities, but also in cities, because of cultural and economical diversity, e.g. newer emigrants communities, or High-educated individuals.

Functions:

These networks have the following characteristics, they are:

Lead to weakening of a close-knit network structure -> these are prone to change, innovations and influence between groups and may lead to language shift/language transfer/language/language replacement.

Dear Vit,

We use the Dynapac LF62 in our labratories (pls. see the picture attached).

Best regards, Harald

I'm having the same problem in 2022.

Low recoveries are typically due to too low a combustion temperature but high recoveries must be a calibration issue

You need to identify first all the possible and relevant strategies for the maintenance. When the failure probability is high even if the severity is less your maintenance strategy is to detect such failures. If the failure probability is high and severity is also high, your maintenance strategy should enable predictive and preventive maintenance. Few thoughts from me. If you require more insights pl let me know exactly what you are looking for

This number is suitable for cattle comfortable temperature (generally 15 to 18℃), house feeding, light activity, no stress environment. When the temperature is below 12℃, the maintenance energy needs to increase by 1% for every 1℃ decrease. Net energy for weight gain (kj) of growing-finishing cattle = (2090+25.1W)X daily gain /1- (0.3x daily gain) [where W is body weight (kg)

Cytoplasmic male-sterility (CMS) has been used in F1 hybrid seed production in onion (Allium cepa L.). The CMS lines can be maintained by pollinating it with cytoplasmic male fertile line.

https://www.researchgate.net/publication/348161941_Male_sterility_in_onion_Allium_cepa_L_origin_origin_evolutionary_status_and_their_prospectus#:~:text=Cytoplasmic%20male%2Dsterility%20(CMS),been%20obtained%20in%20previous%20studies.

My group pioneered peptide sequencing by in source fragmentation almost 35 years ago on nESI-TOF. ESI is a metastable process. There is a process time constant associated with every tweak you make in the system. In the old days you had to tune the MS which involved things like adjusting detector threshold voltages, the push-pull voltages of the orthogonal ion beam diverter to the TOF, Einsel lens potentials, gas flows, and nozzle voltage, and x, y, z position of the nanospray head. While the service tech can now set these so you can forget it on today's MS instruments on the annual maintenance visit, back in the day we had to do this every single day on startup. Every tweak you made took about 5 min for the signal to become stable again, so it used to take up to half a morning before you could begin doing your work. You have to remember that it takes time for the ions beam to get through all the electromagnetic components inside the instrument before they get to the detector.

As Sociolinguistics focuses on the relationship between language and society, this relationship being multilayered has led to the emergence of all those subfields which connect language with the sociocultural fabric of any society. Whether one looks at cross-cultural linguistics, language and gender, dialectology, contact linguistics, multilingualism or language endangerment, all these areas fall under the domain of Sociolinguistics.

The following references were very useful for me for the creating case studies in relational databases concerning DBLC, which is very similar to SDBC: http://www.pkirs.utep.edu/cis4365/Tutorials/Database%20Design/General%20Design/Tutorial%207.00100/tutorial%207.00100.htm http://cisnet.baruch.cuny.edu/holowczak/classes/4300/week2.html http://courses.washington.edu/infosysb/class6-00-10-06.pdf http://foe.mmu.edu.my/course/ecp3076/Lec6.ppt

Orbis database, most comprehensive ownership structure up to 0.01% shareholders and subsidiaries up to beneficial ownership and Group Ultimate ownership information

Hi Samer Al Halasah

You would have to get in touch with some of the companies and see if you can request the data. I would imagine not many will be fore coming. However, if you sign a NDA and you arent going to publicise were the data has come from then they may be willing to provide you with the data. Does your University have any collaborations or partnerships with any manufacturing companies. If they have it may be easier for you to go down that route.

Best Regards

Martin

I might consider a broad approach as a first step. I would familiarize myself with the data by visually exploring the data. In my space, a graph is an important analysis tool which helps providers direction.

Thank you Dr. Bulcsu Szekely !

Great

I recommend you to use ROCK inhibitor (Y-27632; Wako) at the first day of seeding then should be removed after 24h (more than 24h has negative effect on cell growth)

If you want to, yes. Why not?

In a general perspective, the average total cost of the analytical apparatus to chemical experiments (polar and nonpolar compounds) such as GC and its specific columns, HPLC along with specific detectors, NMR, Amino-acid analyzer coupled with its equipment and other analytes preprocessing equipment is varies between from 100 to 250 thousands dollars. The cost of maintaining such a laboratory is estimated between 15 to 25 percent of the total cost of its equipment, averagely. However, the mentioned costs do not include a comprehensive lab.

To identify the failure modes of valves, motors, switches, etc. you can read maintenance manuals of that specific system/equipment, brainstorm with experts and check out for equipment maintenance/breakdown history records. Then you can decide the criticality of that equipment and what maintenance strategy that you are going to apply (You may read more on "Reliability Centered Maintenance"). Then if the predictive maintenance strategy is justified, there are several methods/tools you can use to predict abnormalities, Ultrasound/Vibration analysis/Oil analysis/Non-destructive testing, etc.

Eg: Induction Motor

You can use ultrasound to find an abnormal condition of an induction motor at an early stage. You can use vibration analysis to predict the motor bearing condition/defects. When bearing condition got worst you can hear the noise and also then using thermography you can see the hot condition of the motor. ( You may refer to PF curve). EMD technique can be used to predict stator winding conditions in downtime.

Hola Iker Otxoa De Latorre

In case you would like to utilize Machine Learning, I think you should consider an Unsupervised method, because Supervised learning like Classification is not always practical in industrial environment due to the lack of labeled data.

One solution you can consider is to use AutoEncoder for Anomaly Detection of Time Series data.

You can refer this paper: https://doi.org/10.1016/j.egyai.2021.100065

In case you like a programming example: https://www.tensorflow.org/tutorials/generative/autoencoder#third_example_anomaly_detection

Yes, your data is Time Series, but with Deep Learning approach like AutoEncoder, your time series doesn’t always need to be equally spaced (just accumulate when machines runs).

The general idea is to collect time series data of normal state for training the AutoEncoder until it can reproduce the input with an acceptable gap (small reconstruction errors). Then you used the trained model to monitor real time data. If the trained model cannot reconstruct new data (big reconstruction errors), there is a suspicion of Anomaly.

Of course, some data preparation (e.g. normalization…) must be done when training as well as monitoring.

I am applying this method for my Trabajo Fin de Máster (an Industrial Predictive Maintenance topic) and the preliminary result is quite positive.

With this approach, in short term, you may provide quick results for factory improvement. At the same time, as I search in Google Scholar, this approach is still new (most publications in 2019 - 2021). It means there is still much room for your academic research in long term. I think you're right, Time Series modelling is mature, but not too mature for your further ideas.

Of course, it is just the way I know and there are many possible methods.

I am finalizing my Trabajo Fin de Máster using this method. You can contact me for further discussion if any.

Un saludo,

Marcos Huy Le

Hi, Pranjal Garg so first I would say you could search on Google Scholar. You should see, if the search is reduced to a minimum the question of citations. You could then do a search on Scopus and PubMed always getting the number of citations.

Trivially, if you also search on our ResearchGate portal you can find information on citations and various metrics such as interest related to that topic.

I hope I was helpful, if you need a hand in C. Elegans feel free to contact me.

Keep in touch.

Voltage regulation could be controlled by not allowing neutral point to shift by monitoring the load balance, as poor regulation would be of heavily loaded phase…

Would reduced the life consuming cost, would increased the generating and transmitting efficiency, would reduced the temporary faults, increasing reliability of power system. Short time overloading could also be increased, refer my papers on short time over loading utilizing remaining life of a day……

Ahmad Jazzar points 1 & 2 shows if you want to extract a value for total discharge in PLAXIS 2D you need to simply define a cross-section (CS).

By right clicking and defining two points on your model you will be presented with a value for total discharge. What is the case the unit?

One of my favorite authors on this topic is M.V. Ramana:

Dear Andrea:

You could realy benefit from this valuable attached book about your topic:

"Energy Indicators for Sustainable Development: Guidelines and Methodologies"

By INTERNATIONAL ATOMIC ENERGY AGENCY, VIENNA.

I hope it will be helpful...

With my best wishes...

Similar question to before, but for bearing replacements. Do people actually do this every 4 years as recommended without seeing any worrying symptoms? I've never sent a pump in for this, and I imagine this is >$1k service charge, but I also don't want a pump to shred itself because I didn't do it. Then again, if you start to get overheating and auto shutdowns in advance of something catastrophic, this could be used to indicate bearing replacement time prior to a serious problems. I've been working around turbo pumps for almost 10 years and been responsible for probably 12 turbos, and I've only ever seen a turbo shred itself once at an institution I was at, and that wasn't even my lab, and the turbo involved was comically old. Destroying a pump because of pushing maintenance intervals is a terrible outcome, but this honestly seems rare in my experience, and spending the cost of a new pump on bearing replacements every few years is also not ideal if you are quite unlikely to avoid destroying a pump. I understand the considerations are situational, e.g. if an unexpected pump failure in an industrial setting will lead to a huge daily monetary loss in revenue or productivity then skimping on pump maintenance is unwise, but if it means a couple weeks delay in an experiment and the failure is a super rare occurrence this is not such a big tradeoff.

In short, it is just another cycle or variation in marketing. "Synthetic" drugs have not "failed", and MOST were developed from "biologics" to begin with. Biologics may be a step up in potency to many homeopathic or 'herbal' cures. The production methods (live organisms) are what make them more expensive than synthesized drugs. It is an alternative, just as Vegan diets or Homeopathy are alternatives to health care concerns. They are not necessarily 'better', as each individual is unique in lifestyle, ailments, and response to disease and curative agents.

Mesenchymal stem cells tend to have a biphasic spectrum of responsiveness to inductive factors, including osteogenic factors. Therefore, if your particular preparation of MSCs has a tendency to behave in an osteogenic manner under baseline conditions, inductive factors like dexamethasone could actually inhibit this osteogenic process. Osteogenic tendencies can be gradually induced by several factors inclusing certain FBS preparations, and sustained exposure to high cell density during passage. For rat MSCs especially, culture at very low density - a good rule of thumb is have them touch no more than two other cells at the point of harvest. - this is an oldie but a goodie: Javazon et al. PMID: 11359947

Hi Muhammad, I attached the data sheet, hopefully is usefull.

Thank you for the link Mohammad Mahbubur Rahman

Indeed, Pareto's law allows prioritizing the allocation of resources, segmenting the assets that add value from those that do not. However, this tool must be embedded in a context of statistical control, due to in isolation it offers somewhat superficial conclusions. In other words, the approach at this tool must be after doing a whole design of experiments, a pilot test and a definition of the levels of randomness in the processes.

sounds like a slippery connection (belt?) between your motor and grating/slit. if possible check it first.

Compare the Top Equipment Maintenance Software of 2021

Also this thesis:

A Simulation Based Approach for Determining Maintenance Strategies

By: Vasanth Murthi

Hello Mary, no need for maintenance for the pellet as long as it is not blocked/isolated significantly from the bath by contamination. To prevent this, you can indeed isolate the pellet from the sometimes juicy content of the bath by a plastic sheath as per Jesse White`s suggestion. Furthermore, an ultimate solution would be to use a salt bridge which provides the best protection for the pellet against contamination and for the experiment against electrode potential changes when switching bath solutions with different ionic composition.

Predictive maintenance dataset.

By: Cristian Axenie; Stefano Bortoli

Hi Maria,

ABCsampler is an element of the software ABCtoolbox which provides a mean of running ABC inference, and it kind of works like the core of a pipeline: it is able to call an external simulator (e.g. fastSimcoal but you might use any other simulator as well), then call a program that will compute summary statistics (e.g., arlsumstat).

It is weird that arlsumstats won't work on your simulated datasets, maybe check out how these are exported by fastSimcoal? Which type of loci did you simulate?

I hope it does work well on R. Good luck!

"Oral microbiome assay" has no specific techncal meaning. What paremters do you propose to address?

Dear Dr. M. Yehya ,

I believe that the maximum limit of corrosion depth or mass loss in a metal that corrodes in a given environment essentially depends on the type of application and performance required of the material itself.

For example, the extent of localized corrosion phenomena that can be neglected in a certain use are instead critical if the same material has, for example, a structural function and must instead resist critical conditions that can generate risk conditions (e.g. mechanical stress, problems related to flows and pressures of liquids and / or gases, etc.) for the safety of man and the environment.

The subject is very sensitive and to be successful the operation requires a multidisciplinary approach in which the design engineer and the corrosion expert collaborate together.

I suggest you to have a look at the following documents:

- Predicting long-term corrosion of metal alloys in physical infrastructure

Melchers, R.E.

npj /Mater Degrad 3, 4 (2019)

Available at: https://www.nature.com/articles/s41529-018-0066-x

-ASTM G1–90 (Reapproved 1999) -Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens

Available at: https://tinyurl.com/y4gj6qef

- ISO 8044:2015(en) Corrosion of metals and alloys — Basic terms and definitions

Available at: https://www.iso.org/obp/ui/#iso:std:iso:8044:ed-4:v1:en

My best regards, Pierluigi Traverso.

Hello Seyyed, very good question. We just finished one study on AI in CPS (check it out, its open access: ), and the CPS elements as we know them from 2015, have already evolved in a different format. So.. basically old tech is obsolete and cost more to maintain and secure, than upgrade to new systems. I guess by 2025, everything that we install today, will be obsolete, with the new DL algorithm replacing old ML algorithms.. technology waits for no man :)

Hi,

When I used to collect tail biopsies, we used a mild anesthesia like Isoflurane (closed chamber based anasthesia and not the injection based) to put the mouse in a sedated condition (ours was a trangenic mice colony). We then used to snip 5 mm of tail after sanitizing with alcohol and after snipping, we used to wipe the cut end with an alcohol swab till the bleeding stopped.

Here is what I can suggest:

If you are putting mice in a mild anaesthetized condition, lower the amount of anasthetic chemical used or lower the time for which the animal is kept in the chamber.

Cauterizing might be causing stress, especially, if it is a transgenic colony, you can try using alcohol swabs till the bleeding stops. It might also be due to an infection after cauterizing though that is a bit unlikely.

Please check for other factors which are not tail snipping related. Check for feed and water in the cages in case there is a death in future. You can also get the nutritional value of the feed tested if you encounter a weight loss among mice in your colony.

Further, if the mice which died, were visually thin or underweight, you can consider providing your colony with nutritional supplements like cornflakes mixed in oil etc.

Lastly, at times, male mice usually from different litters or different parents fight. So if the dead mice have visual marks of a fight etc. you can consider housing only littermates together.

Hope it helps.

Thanks to Dr. Robert D. Torrence 's EEG experience I was able to answer this question by consulting Steven J. Luck's "An Introduction to the Event-Related Potential Technique, second edition" and Mike X. Cohen's "Analyzing Neural Time Series Data: Theory and Practice." The length of the baseline depends on both the length of the epoch as well as the purposed analysis (ERP/ERSP). In general, baselines in M/EEG experiments should be a minimum of 20% of the length the overall duration of the epoch. Typically, the baseline for a 1000ms epoch in an ERP design should be about 200 ms long (-200 to 0ms). Whereas, a time frequency analysis would require a baseline between -400 to -100ms, making sure to use multiples of the duration of one period (100ms) of the lowest frequency of interest (alpha: 10Hz). Additionally, in spectral analyses, the baseline should be offset from the stimulus onset to avoid temporal smearing effects. Thanks again for a clear and concise answer Dr. Robert D. Torrence!

Bonjour, je viens de récupérer la base de données : https://www.kaggle.com/nphantawee/pump-sensor-data. Avez-vous quelques références d'articles qui parlent de cette base ? Merci par avance.

Dear Anusha,

Sorry, I don't have the answer, but wanted to ask the same question! Did you purchase the osmometer in the end?

The following link has some reviews, which seem to recommend this machine:

Best of luck!

That depends on the model for the system economics! IF the project is purely a government subsidy, then those costs should also be included in the overall project plan and execution. A "lump sum" to install facilities with no provision for maintenance and operation is never a wise use of public (or other) funds! Along that line, a key design parameter SHOULD be ease and low cost of maintenance as much as "energy efficiency"!

Going forward, one practical option is to train some of the stakeholders (recipients of the power) as qualified maintenance personnel. They'll be local to the system, gain valuable skills, and have a direct interest in maintaining operations at minimal costs - including at-cost or free service for a contract time to cover their training and investment. Any replacement parts or consumables goes back to the initial planning and budget. IF you didn't do it then, LEARN from the error. To make it viable similar mechanisms (grants, loans, donations) would need to be established to continue the operation of the installed systems.

At the beginning use FMA method that is method of causes and consequences. After that compare with other analyses in the organisation and give recommendations for amelioration.

I agree with and Günter Becker . ANN is a prediction tool. If you have one or more equipment failure data, you can use Weibull distribution to analyze the failure.

Due to the Weibull distribution, you will be able to comment and create schedules about the behavior of the equipment and even the system.

Cost factor is the most important criterion in these scheduling. Thanks to the Weibull distribution, I suggest you take advantage of the relevant study below in order to determine maintenance periods about costs and failure.

Thank you Radek for your valuable feedback! I really liked the Axio Observer, however after the microscope installation we did have to have maintenance a couple of times. Possibly this was due to the many added extras it had? I just want to add that the Zweiss service in our region (Göttingen, Germany) was usually really good. Thank you for you comment on the Celena S as well. Defentitely a point to consider.

Absolutely right sir. @Mr.Russel King.

Thank you.

Yes Dear sure.

Good job

Please check the following:

https://www.cementequipment.org/home/measuring-the-right-level-of-maintenance-costs-in-a-cement-plant/