Questions related to Transport
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
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?
Thank you very much,
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?
I invite you all to discuss,
Thank you very much,
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)
- 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?
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?
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.
"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.
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.
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
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.
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
A) Matrices of set
[i] a simple rationale
[ii] use for containers
 Generating scenarios for simulation and optimization of container terminal logistics by Sönke Hartmann, 2002
 Optimising Container Placement in a Sea Harbour, PhD thesis by by Yachba Khedidja
 Impact of integrating the intelligent product concept into the container supply chain platform, PhD thesis by Mohamed Yassine Samiri
How to find out the trapping phenomenon for peristaltic transport of non-Newtonian Herschel bulkley model
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.
I start working on research about international air transportation and the spread of COVID-19, and I need urgently the network of global Airlines.
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?
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?
Is there a reference where can I study the step-by-step derivation of the two-group interfacial area transport equation by Ishii?
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?
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.
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).
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!
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.
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,
NB: Something like
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
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
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?
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?
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?
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?
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?
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.
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
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
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?
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?
"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."
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 ?
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?
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
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.
Any idea/suggestion about using molecular dynamics simulation about transport and geomechanical fate of proppants?
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.
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.
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:
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.
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"?
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?
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.
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.
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.
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?
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?
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.
I am looking for the gene that may responsible for metal transport in the plant (Rice) under stress condition.
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?
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.
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?
- 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
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?
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. ?
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?
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?
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?
I have thought of a method but I would like to contrast it with other experiences.
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.
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)?