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Analytical Modeling - Science topic

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Questions related to Analytical Modeling
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What types of data will be required for measuring the WTP and WTA. What types of analytical model or tool be used to assess the WTP and WTA. How can I develop a questionnaire for required data collection.
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Thanks..@Proloy Barua
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Hi altruists,
Hope all of you are doing well. I am looking for literature on the NorSand model, which considers the drained cyclic triaxial testing behavior. I have found a paper by Michael Jefferies, "Principal stress rotation as cause of cyclic mobility." However, this article considered strain-controlled cyclic simple shear tests (with a constant volume approach). As you know, during cyclic triaxial testing, the effect of principal stress rotation is negligible (especially during drained tests). Moreover, I would like to model a set of stress-controlled drained cyclic triaxial tests. Could you kindly help me with this?
Thanks a lot in advance for your kind help.
Best regards
Towhid
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Just not sure about drained cycling, cycling loading is usually undrained
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I plan to divide my long research article(simulation + mathematical) into two parts, but I am clueless about how to do this. (I can not separate the simulation and mathematical analysis)
I have a few questions regarding the same
1) Do I need to show the common mathematics in both parts?
2) Can the introduction be the same?
3) Can some explanations remain the same in both parts?
Can someone give me the reference of any article divided into two parts?
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Dear Amit Das,
See my comment precede by >>
I plan to divide my long research article(simulation + mathematical) into two parts, but I am clueless about how to do this. (I can not separate the simulation and mathematical analysis)
>> If the mathematical model is highly original and valuable by itself - you can publish it either separately or along with key simulation results. If the model is quite standard, just briefly refer to it and focus on simulation results. Either way, splitting it on two articles hardly makes sense.
I have a few questions regarding the same
1) Do I need to show the common mathematics in both parts?
2) Can the introduction be the same?
3) Can some explanations remain the same in both parts?
Can someone give me the reference of any article divided into two parts?
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Experimental results of the Sound absorption coefficient of material have mostly been found to be in good terms with the Theoretical models. But the calculations look confusing. With imaginary terms and differential equations.
Are there any simplified calculations and methods for theoretical modeling in acoustics?
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Regarding your question on the Nocke paper, Equation 6 is derived from the previous 5 equations. The numerical value of Equation 6 depends on the values chosen for the parameters b, d, t and D. If the system is linear, the impedance should not be dependent on sound pressure, so I am guessing that the p in the denominator should not be there.
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I am trying to solve the differential equation. I was able to solve it when the function P is constant and independent of r and z. But I am not able to solve it further when P is a function of r and z or function of r only (IMAGE 1).
Any general solution for IMAGE 2?
Kindly help me with this. Thanks
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check out this paper using a Laplace transformation for solving nonlinear nonhomogenous partial equations
the solutions are not trivial which is different if your coefficients and the pressure P are constant
Hopefully it helps
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I have a set of experimental data (EXP) which I have fitted with two analytical models (AN1 & AN2).
In order to estimate the precision and accuracy of both analytical models I can study statistics of the ratios EXP/AN1 and EXP/AN2 or AN1/EXP and AN2/EXP.
Well, the point is that statistics of such ratios are not coincident.
I see that many researchers adopt the first approach when I istinctively would go for the second because I can compare two different analytical models by normalizing them with respect to the same experimental variable.
Is there anybody who can help me out with this?
thanks.
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Hello.
I am facing the same problem.
I think till date, you have got an answer you can share with me.
Second thing; I have a set of experimental data of dampers and 10 parameters to play with (stiffness, radius of nozzles, orifice and so forth.....).
I would an advice from you, on how to attack the problem so I can come up with an analytical model of it to optimise the design?
Thank you.
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Program execution time depends on the number of instructions as well as on computing power of the machine. Does anyone have some recommendation where to find an analytical model for estimating program execution time according to program instructions and CPU, RAM, and DISK characteristics?
For example, if we know the number of instructions, CPI (cycles per instruction), as well as hardware specifications of CPU, RAM, DISK, how to calculate (estimate) program execution time?
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Prof. Alem Čolaković: I think that our colleague Prof. Ashraf Suyyagh has given a good answer to your valuable question.
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Hello everyone,
I've been trying to simulate a NCFET using the approach suggested from "[1] Moparthi, Sandeep, et al. "Analog and RF performance evaluation of negative capacitance SOI junctionless transistor." AEU-International Journal of Electronics and Communications (2020): 153243. and [2] Jiang, Chunsheng, Renrong Liang, and Jun Xu. "Investigation of negative capacitance gate-all-around tunnel FETs combining numerical simulation and analytical modeling." IEEE Transactions on Nanotechnology 16.1 (2016): 58-67." But, I'm facing difficulty in extracting the Q-V characteristics (ref [2] for more info) to further extend my work on NCFET using TCAD. Please, explain how to extract the Q-V characteristics from Silvaco ATLAS TCAD. TIA.
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Dear Rameez Raja Shaik. May the attached content help you .
Good Luck!!!
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Can anyone please help me to analytical modelling of permanent magnet synchronous motor using Matlab code?
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Dear Ahmed:
You can benefit from this attachment file
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Hello Everyone,
for my master's thesis I am designing a multicellular structure. I have built an analytical model of my elementary cell and now I would like to verify the theoretical values ​​of the Young's Modules and the poisson ratios with a FEM simulation. Now I have a few question:
The Material that i use is Nylon PA6 ,
1) I don't know what values ​​to insert in the Plasticity part .. yield stress and plastic strain .. can someone help me? .. I can't find the tabulated values
2)
How do I calculate the value of the Modules through the simulation? .. I mean the procedure to follow.
I have to compare it with the theoretical value of my model.
I am attaching images of the structure and parts that I quote .
thanks.
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I found info in a google search...."physical properties of Nylon PA6"
here
and here
and here as well
and more generally here
I'd suggest modeling your part and (virtually) repeatedly stretching and compressing. If I understand your shape....Nylon tends to first weaken at the edge of a fold. And, next, in presence of UV light.
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Hello everyone,
I am trying to develop an analytical model to study the propagation of fracture in reinforced concrete structures. I would really appreciate it if anyone could suggest to me the optimal analytical model to study the crack propagation.
Thanks in advance
Regards,
Pawan
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What I am trying to say is that this field been has been killed with research and others spent years working on it and had teams of students exploring it. If you are starting thesis research maybe you could consider whether this is the right direction to explore, or could you select a more timely topic with more potential for novelty and better prospects of success. If you are passionate about fracture and feel that you can add to the state-of-the-art then that is a different discussion. Good luck.
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Accurate performance evaluation of Cloud Computing resources is a necessary prerequisite for both client and provider to ensure that quality of service parameters remain within agreed limits. For that, many researchers were modeled the cloud computing using different analytical modeling technique such as queuing networks, Markov models, Petri nets, etc
But the question that arises is “how we choose the most suitable analytical modeling technique for cloud computing”.
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I agree with Suvendu Chandan Nayak , he explained that in a very practical way.
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Hi everyone,
I tried hard to find this article (reference given below), every possible way that I am aware of. I wonder why am I not able to find it. Can anyone please help me to have an access to it?
Uphoff, N., & Moharir, V. (1994). An analytical model of performance for developing indicators of employees’ capability. Journal of Public administration, 17 (3), 372–379.
Thank you
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I asked on Twitter but nobody respond:(
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I am analyzing the throughput of 802.15.4 for heterogeneous traffic. My simulation (in ns2) gives higher throughput than the results from my analytical modeling.
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Results of any model, analytical or simulation, depend on the 'assumptions' made which are only a simplified version of the real world.
In practice, in many cases the observed throughput are higher than both analytical and simulation model results.
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The acceptable practice is to validate a model used under any study. What validation methods are available and would we confirm one superior over others?
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Welcome.
You can validate your analytical model by the following methods:
- running experiments under the same assumptions of the analytical mode
- By using numerical simulation where the the system is solved by the numerical methods. There are now powerful simulator for many disciplines of science such as electronic circuits , electronic devices, semicondcutor fabrication processing.
- In some statistical systems they can be validated by Monte Carlo simulations.
This is list may not be exhaustive
Best wishes
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Hello,
I want to understand if I shall use Unstandardized or Standardized Coefficient Beta? The difference between the two is around 20% in 90% of the values. I have used a Path Analytical Model with Multiple Regression for the model.
My main research objective is -
"To analyze the member demographics and member associated interests to join a Dutch CSA Farm that leads to organizational success"
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You first of all have to understand the difference between standardized and un-standardized coefficients. Then you will also have to understand when to report either and why. It is not enough to tell you what to adopt but convincing you of why one is adopted is more important. I report mostly un-standardized coefficients because they have units and are real life expressions of the effect of 1 unit change of an independent variable on an outcome. However, please read the attached. https://www1.udel.edu/htr/Statistics/Notes816/class12.PDF . You can also get regression outcome interpretation from SPSS software.
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I can´t obtain the same results in Fresnel coeficients of a materials with complex refraction index (bi-layer dielectric thin-film) with angular incidence.
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Finite Element method is suitable for complex problems. If you have problem and used both methods to solve the problem, the answer should be same with small error. Further, You may have a complicated problem with no available analytical solution, Then you, must go to the finite elements methods. The question is how to validate your results ?. You need then to validate your FE results using experimental analytical results.
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Hi, I'm new to predictive analytics modelling. I am looking at a customer database with custimers who have converted from a non contractual agreement to a contractual agreement. And I am wanting to predict on the current database who is likely to convert from non contractual to contractual.
How do I split my dataset for training,validation and testing?
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Thank for you all your feedback. I think i now know what i should be doing :)
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Hi,
I want to find an analytical model for the wave propagation of acoustic sound from a vibrating area (for example circular piston) without any baffle around it. I read many acoustic reference books, but i'm confused about this problem. The analytical models don't match with the F.E.A results!!
I'm appreciate if any body can guide me about this problem?
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Thank you Mr. Durrani for your helpful attention
The articles you mentioned are about Acoustic Emission (It's generally stated as acoustic emission in solids).
But my problem concentrated on sound propagated from vibrating subject in air. I studied important books about acoustic and there are tow approaches in solving acoustic wave propagation: 1- by using Rayleigh integral form and 2- by using dipole sound source model. I think the Dipole model is better. The results i achieved, have the same forms but the numerical values are not similar at all. I want to know what model i must use and how? and is there an integral form for this problem is useful?
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I'm considering an analytical model for the cloud computing composed of:
- input load balancer (LB) with M/M/1/K
- P (PH) physical machines with hypervisors, each able to host V (VM) virtual machines.
So the total number of processing units N = P*V.
My question is shall I then put an M/M/1/K queue for each VM or for each PH? In other words, should there be P or N queues? What are the disadvantages and advantages of both approaches? Literature review shows there are both.
Thanks in advance for any comments,
P.
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I'm interesting..
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First question: Are there any paper that accurately model the relation between OD and CFU/ml or bacterial count per ml? I mean in terms of analytical model, not experimental correlation.
Second question: When a study state the final bacterial density in CFU/mm^2, how can I know how many bacteria consists one CFU? Can't one CFU be evolved from more than one bacteria?
Thank you all!
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It very much would depend upon your experimental conditions. The actually # of cells should not change (unless your conditions are such that the bacteria are still growing/dividing) but when you talk about CFU adhered, then time could have an affect on adherence rate. It very much would depend upon the design of your experiment.
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I model planking-and-strutting with two levels of struts. In the first phase first level of struts takes up the lateral earth pressure, the force of compression come out in the strut. But in the second phase, second level of struts takes up almost all lateral earth pressure and first level unloads, by such manners, the force of extension come out in the first level strut, its stop working. I understand, that it can be possible in theory, planking-and strutting rotates about the second level strut granting big lateral earth pressure in the bottom (under second level). However, this is not, what happens in the reality, in the practice, first level strut does not unload. Is it possible to create model that is closed to the behavior of the planking-and strutting in reality practice, so that both struts work in compression effectively? Excuse me for my English. I will attach some screenshots to understand my problem. 1,2 - analytical model on the first and second phase, 3,4 - results forces in the struts on the first and second phase. (Unloading from -290 kN to -86 kN)
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Hi Aleksandr,
I had a look to your model and the adopted properties assuming the GWT has been dropped to a meter below the final excavation level. I also assumed that there is no structural element at the base of excavation. Please see my comments below:
- The way that the retaining wall is deflecting has a significant impact on the forces in the struts, which basically can be the reason for having the forces explained in your question.
- You need to ensure that you are adopting correct stiffness for the wall to meet both structural capacity and deflection criteria. Please note that EA unit in Plaxis is in kN/m.
- Also the validity of adopted properties for the ground materials below the final excavation level should be cross checked.
Regards,
Ali
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We have developed a floating point architecture, but it has been asked us to analytically justify the performance efficiency of our architecture.
Thank you
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Thanks to all for your valuable information.
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Dear Researchers
I am currently trying to quantify the shear crack widths under service load conditions for RC Beams. I am trying to develop an analytical model to be able to predict the shear crack widths at service loads. However, I need the experimental data of measured shear crack widths throughout the loading cycle to validate the model. I would really appreciate any recommendations to such studies? Also, if you have these papers, please share it with me.
Sincere Regards
Anshuman
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Hi Habib!
Thanks a lot for your reply! Indeed I am using the data in this paper to validate my model but I am also looking for more data from other research to validate the model regarding its capability to predict the crack width in RC beams under service load conditions. By any chance if you have access to one of the papers or thesis in the document below, please share the same. I shall be deeply obliged.
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In my opinion, some banks and corporations develop systems of integrated, multi-faceted, based on improving advanced analytical models of risk management supported by analytics based on data processing techniques on computerized Business Intelligence platforms.
Do you agree with me on the matter?
Please reply
Best wishes
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Always requires to.
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Hello,
I am going to begin my thesis this semester. The thesis involve the use of machine learning in order to predict fault in power electronic converter. The first task is to create a good model for the IGBT failure and another analytical model for the aging of capacitor. I just want to know if their is a book that shows the experiments needed in order create these models.
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Please read my paper (Up/Down Converter Linear Model with Feed Forward and Feedback Stability Analysis)
You will find a power electronics converter and the model for it and simulation.
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I want to know about extraction of barrier height using silvaco atlas tool for schottky barrier mosfet simulation.
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By varying temperature for fix voltage and extracting current out of the diode and plotting Richardson graph can give barrier height.
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Hello, Everyone I am currently doing my thesis in rehabilitation of steel structures. How can we  find deficiencies in the current structures as per the current Codal  provisions ?
Can anyone tell me the exact & accurate Software references .
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hi . you can rehabilitation structures with ETABS or sap. in newest version added nonlinear analysis
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Hi, 
To get an idea about the resistance change due to deflection and debonding effects (of the gauge from the substrate) due to low adhesion, I need some analytical models.
Generally speaking, for the deflection-resistance part there are some geometrical models that consider classical beam theory and debonding can be modeled with Coherent Zone Model (I think).
I would appreciate, if you could give your opinion and suggest more concrete models for those objectives. Also which software (COMSOL, Ansys..) would be the best to simulate such structures?
Thank you,
Bartu
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Hi,
You can try ansys APDL/Workbench. in ansys you can create a cohesive zone material (CZM) and specify the debonding parameters also there are several concrete models with various failrue criteria
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Can anyone help me to know about the analytical model for prediction of wear in sprockets.
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Mr. Pham but my consideration is in occurrence of rolling and sliding contact between roller and sprockets in chain drive. I want to know about at what instance these rolling and sliding takes place then only i can use the appropriate friction coefficient.
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Hydraulic Fracture a future road map abundant oil and gas production in North America. Key challenge is design optimization and successful execution. I would like to focus on second part, Fracture  execution specially for HP, HT  15000 psi and slick water operations. Tons of surface treatment pressure, rate and sand concentration data is captured during job.  Is there analytical model based on data are developed in order to predict screening out. 
Thanks 
Javed 
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Hello;
If you already have this tremendous volume of data for specific field; I recommend to you to build your own empirical model based on this data using ANN.
Regards;;;
Moahmed
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To fabricate a 1 kw ORC I am willing to purchase a expander. But the seller 3M™ Novec™ 649 Engineered Fluid is not mapped in their analytical model , so I need a similar alternative just to check if that expander will work for me or not.
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check on the refrigerant not the commercial name
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The telecommunications data transmission analysis requires analytical modelling techniques to ass the Quality of Service Provision.
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Traffic models or patterns, especially in an optical switched network depend on several parameters such as model traffic transfer that may follow probabilistic behavior, especially during a conflict between data granularity in the core node. After the switching process, the core node can change the behavior of the traffic based on the methods used to resolve contention issues.
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Dear,
In various research papers related to this topic (for example:
it can be seen that the gate potential is shown with ΨG that is given by:
ΨG=VG - Φ +X+Eg /2q
my first question is about the unit of components in above equation,
VG (in volt) , workfunction Φ (in Volt) , electron affinity X (in volt) and Eg (in eV) ,
1-Is these true?
2-In this way since the unit of workfunction is eV, Is it true to say Φ is negligible in above formula?
The second question:
In short, we can say that the analytical model for surface potential in a DM-DG-TFET can be obtained based on the solution of Poisson equation (the potential at channel-oxide interface), after using parabolic (young) approximation and with the use of boundary conditions, transforms the 2D poissons equation to a 1D where the particular solution of this 1D equation can be expressed as:
QiGi +(qNitsi)/(2Cox) i=1,2,3,4
i=1 is related to the depletion region in source and i=4 is related to the depletion region in drain.
3-What is ΨG1 and ΨG4 equation?
4-In Qi is (qNitsi)/(2Cox) negligible against ΨGi ?
Best Regards
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How you write your first equation for the potential depends on where you set your reference potential: the only measurable parameters in experiments are voltages, which are potential differences. Hence, the notation V_G with index G as subscript is insufficient - it should always by V_GX where X is your reference. What do you choose for X? Units are OK in your equation, as energy in eV divided by the elementary charge gives V.
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Hello!
I have simulated result of thermal stress for assembly. Now i want to validate it with analytical model or mathematical model so please suggest me the process of mathematical or analytical model by which i can validate my simulated results. or suggest me a reference paper.
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Dear resercher, You can see also the paper - Methodology of Transport Scheme Selection for Metro Trains Using a Combined Simulation-Optimization Model, that is in my profile. There are others coefficients for validation the simulation model.
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Hi all,
I am doing system Identification for a space truss. Mode shapes from my experimental data are matching with that of analytical model but natural frequencies are not matching...I have tried to adjust the model parameters e.g stiffness and mass but i could match only Ist frequency at maximum...any suggestions for that?
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Dear Muhammad Mazhar Saleem,
Look the link, maybe useful.
file:///C:/Documents%20and%20Settings/user/%D0%9C%D0%BE%D0%B8%20%D0%B4%D0%BE%D0%BA%D1%83%D0%BC%D0%B5%D0%BD%D1%82%D1%8B/Downloads/9789400761124-c2.pdf
Regards, Shafagat
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I am trying for MATLAB codes for analytical model of PMSM motor based on magnetic vector potential (with surface mounted permanent magnets )that can predict torque,magnetic field distribution and losses. Kindly help.
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I am into modeling of nanowire transistors
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Hi everyone. I was wondering how the uninstalled thrust and TSFC with mach number and height variation is obtained experimentally. I have seen such curves are given by manufacturer. How do they measure this variation or is it through some analytical model.
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The basic data (at ground level - speed 0 and "normal pressure") can be obtained on some test stand.
As the dependencies on mach number and ambient pressure are known, the "missing" data is easily calculated.
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I am working on a paper which I have implemented also. I am trying to match the simulation with the analytical model but I am facing some difficulties.
I have to equations p(ps) and ps(p) . p(ps)is the probability that a certain user begins transmission in the next slot and ps(p) probability that the considered user successfully finishes its transmission without the awareness of collision.
I have tried to solve the equations by fixed point method. I took initial value of p let p(1) and calculated ps let ps(1), then used it to calculated p(2) and so on unless I obtained error less than 10^-8. The p(ps) equation depends on CWmin i.e. the initial contention window  and Wmax i.e. the number of transmission attempts. I am changing my CWmin from 2to 2^15  along with Wmax (13 to 0) which shows my CWmax ( max contention window)  (DCF protocol). 
The problem is that for error 10^-8 it is not converging for CWmin from 22 to 27 for any initial value . If i reduce error to 10^-3 it converges but different CWmin converges for different initial value.
why this problem is arising ? How can I solve it ?
I am trying to find a value that works for all CWmin and same error.
2) Another thing i tried is I plotted both equations and found intersection points and used them to find throughput but still the result doesn't match.
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Thank you so much for all your suggestions.
I have tried but at the end it wasn't converging.
For simplification I used MATLAB command for solving nonlinear equations
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Experimental techniques for residual stresses are expensive, not so accurate. so how to calculate residual stresses during roll forming process without using experimental techniques? is there any analytical model for this?
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Hello Daya Yesane,
I don't know any analytical technique to calculate residual stress in roll forming or rolling processes, but you can use finite elements simulations and obtain satisfatory answers.
These references could be useful for you:
If you want to understand better the plasticity formulations on FEM, you can take a look on my thesis and article:
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Do Lennard Jones parameters ε and σ varies with the hybridisation of carbon.
I could find the lennard jones parameters for carbon atom in graphene. Will the values be same for carbon carbon interaction when carbon is in sp and sp3 hybridized states. Thanking you in advance
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I think that the comments above do not answer the question (then I see no reason to recommend them).
Straight to the point: Yes, Lennard-Jones parameters will change with hybridization, but this change will be little as compared to the geometric change in the molecule after changing the bondings, for example, changing sp to sp2 will add another near atom. This added atom creates a much larger change in the interactions than the change in just the carbon.
This is clear by looking at how some force fields are developed. DREIDING (DOI: 10.1021/j100389a010) considers C as only one type of C, but the atoms around it change, as shown in the Table II of that paper.
If you want to see the particular changes, take a look at the Supplementary Information in the OPLS-AA paper (DOI: 10.1021/ja9621760). I attach the relevant table.
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In my view, GE is in the purpose of raise an analytical model for highly flexible problem, however, there's some inaccuracy in it.
ANCF is a FEM method completely, which can obtain an accurate result without a convinient form for analytical modeling.
Am I right? Thank you for your answering!
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ANCF 应该怎么处理转角边界条件呢?似乎是ANCF的一大缺陷
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The IMF has only forecast data up-to 2021. What analytic model can I use?
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Mario's method is even more complicated than PPP.
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Dear Colleagues, I am developing an analytical model for computing the internal wave celerity in a linearly density stratified fluid in a circular cross-section channel, i.e. in a bounded domain. The solution for a rectangular cross-section channel is given in Baines, 1997 (see the attached pdf for the complete reference). I have used some results by Yih (1980) referred to a full circle cross section. These results map the circle into a rectangular domain and found a solution in terms of Mathieu functions. The results by Yih did not give the dispersion relation of the waves, but it is straightforward to evaluate such a dispersion relation, at least for the long wave approximation, see the attached pdf. A further step is to consider a half-circle cross section with a lid at the top, since my experiments are in a circular cross-section channel half filled. To tackle the problem, I have used the same transformation used by Yih, but changing the rectangular domain (see after eq.25 in the attached pdf). Then the same expression in terms of Mathieu functions for the full filled circle is recovered and with further computations I obtain the same dispersion relation already obtained for the full circle. This is somehow disturbing me, in the sense that it seems that in the long wave approximation the internal wave celerity assumes the same value for the full circle and for the half circle cross-section channel. I would appreciate your comments on this point. Thanks Sandro
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Dear Mr Mirabi,
thank you for your suggestion. However, I was looking for an analytical solution, similar to that depicted in the script attached to my question. In addition, I am interested primarily in internal waves in a fluid at rest, so no turbulence is involved.
Sincerely
Sandro
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I am currently studying the Predictive Analytics. There are two questions which I couldn't find the answer is:
(1) For what predictive analytics (such as Neural Network, Case Based Reasoning etc.) we need to normalize the data, and what is the purpose of that?
(2) Which type of data is suitable for which predictive analytics? (For example, how is the type is suitable for using Neural network, or Case Based Reasoning?)
Please give me some ideas or recommend some good sources I can read? I couldn't find articles which compare the uses of analytic models
Thank you
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Well, the main difference between CBR and NNs or SVMs is that in CBR you do not learn a model. It is what is known as a "lazy learner". In classification tasks is like a Nearest Neighbor classifier. For further info you may look at this paper:
R. López de Mántaras, E. Armengol; Machine Learning from Examples: Inductive and Lazy Methods. Data and Knowledge Engineering Journal, 1998, Vol. 25, nº 1-2, pp. 99-123. 
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Hi all,
I found "Roark’s Formulas for Stresses and Strain" to be a useful source for strain equations for different cases. But I couldn't find scenarios with varying cross sections.
I would be simply interested in linearly varying cross sections and simple load configurations. Do you know any reliable literature where such cases are discussed?
Thanks,
Bartu
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Tapered beams need accurate modeling: cross-section stress distribution as well as constitutive relations are not trivial and deeply influence the beam behavior. A simple model that seems also effective and accurate is
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I wish to make sure that the model we are building will suit the highly selective criteria of MS.
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Dear Dr. Brusset
Your problem "the editorial board at Management Science has guidelines or special requirements about the sample size, methodology etc. of a survey or field study."
I suggest you can read the article "Why Top Journals Accept Your Paper, MIS Quarterly Vol. 33 No. 3 pp. iii-x/September 2009." This paper have been pointed out what criterial or requirements should have in your paper, then top journal such as Management Science maybe accept to publish.
Good luck to you
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This assumption is the main difference between Warren and Root models.
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In reality, it is expected that the blocks feed each other.  This is known as the "block-to-block" interaction. The extent of this process depends on the type of oil and fracture properties.
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 When are multi-layer cellular neural networks the same?  
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Please re-frame your question.
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By user, I mean free users.
By customers, I mean paid users.
By optimal ratio, I mean the number of free users you need to make the business viable, given a certain conversion rate.
Or, not necessarily a number even, I'm interested in how you could analytically model this.
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Veterinarian-client-patient discourse
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Hi. If it is a spoken discourse, then I would recommend CA. However, if it is a written discourse, then perhaps you would want to consider Critical Discourse Analysis (CDA) or Computer-Assisted Corpus Analysis (CACA). 
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I want to plot mode shapes of rectangular plates with x, y and the deflection data in MATLAB. I can surface plot. But my question is how to add plate thickness as shown in Page 7 of "Three-dimensional free and transient vibration analysis of composite laminated and sandwich rectangular parallelepipeds: Beams, plates" by Qu, YegaoWu, Shihao Li, Hongguang Meng, Guang
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Thank you Sir for your time and help.
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I have a rectangular plate fixed at one edge and want to find out the deflection due to transverse load on it (concentrated in one case and distributed over a small area in the other). Please help me how I can find it out.
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Hallo Bawane, 
or through von Karman Theory but this is complex!
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I want to do modeling of compliant XYZ stage using flexure based compliant displacement amplifiers. Also for synthesis which book shall I use?
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Hello,
This paper could be useful.
Good luck
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Can someone provide analytical model for relating the thickness and the curvature of a masonry arch (with internal steel reinforcement) to the applied load? 
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Use the homogenization theory in order to determine the equivalent characteristics of the composite (ei.Young module, inertia), subsequently you can leading an ordinary material strength calculation.
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Hello,
Currently, I am working on building predictive analytics model to predict early diabetes by comparing healthy person habits and symptoms with diabetic patients.There will be few other components of my prediction (that I can not share right now) I am certain that my model and algorithms will work perfectly and provide an accurate result. As you know, data is an important part for the accuracy of the model. Therefore, I need the dataset for training and testing of my model. I have already built the concept and mechanism to provide real time prediction. I would appreciate if someone can help me getting the dataset that includes good amount attributes.
Regards,
Shail
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Devin: I think behavioral data could be crucial because it shows more insight about the patient than analyzing medical data. I read one interesting case study about leading healthcare provider. They were finding real pain points behind increased readmission. After analysis of unstructured and structured data, they found that leading causes of readmission are behavioral such as loneliness, smoking, no exercise, etc.
If you can provide me some sample data, then I would like to add them into the predictive model that I am building to predict diabetes in advance.
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Dear all,
As I have a bit of free time, I went through an aborted project which was originally a part of my PhD. This was an analytical model of sound transmission through an hemispherical shell. At that time my computation were too slow on MATLAB and I had to switch to a FORTRAN program. However as it took to much time to implement, and as no validation was done, I stopped working on it.
Now, 5 years later, I went through my backup from the university, and run my MATLAB script. Surprisingly, it took less than 5s to compute the solution ! I would be keen on validating my analytical model, as possible using results from numerical models, such as FEM. Do you know anyone who would be able to provide validation results ?
Thanks
Sylvain
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Have you tried using some of Norman Barnett work, he has both analytic and experimental results which might be of some use:
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I want to know the parameters for drafting an analytical model of performance of a disk controller visualized and virtual machine running on it. 
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sry my bad i though something else! ok for this question! i think you need to wait for am answer from a computer hardware engineer. if the Disk you said you mean a hard drive!!!
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To estimate cost (in terms of data transmitted and received) for different tasks assumed by OLSR : Neighborhood Discovery, MPRs Selection, Routes Establishment; I need an analytical model that estimates number of TX and RX just after the Neighborhood Discovery step (during the MPRs Selection step).
Any suggestion or reference is welcome!
Thanks!
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Thanks Fateme !
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Identification of the servo electromechanical actuator, held directly on the real loaded actuator experimentally is the most effective way for determining its structure and parameters. Thus obtained mathematical model can be used for both velocity/position closed loop design and verification of analytical modeling.
I I want to discuss this issue for preparing common research paper further.
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Dear Leonid,
I’m a member of a research group which deals with high-performance motion control systems. We develop special purpose identification algorithms for flexible electromechanical systems based on the estimation of plant frequency response. We also work on the problem of model-based controller design for the automatic commissioning of electric drive systems. You can find some of the results in the research papers published on my RG profile. Feel free to contact me, I’m open to any kind of cooperation on this topic.
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How well would one expect poloidal flux computed through an analytic model of Grad-Shafranov equation to match with the eq. flux reconstructed from the measured flux signals (say through eFIT) within the plasma region ?
It is very easy to use simple analytic models of G-S equation to model poloidal flux contours to visualize for some particular tokamak plasma equilibrium configuration. However, when one compare it with equilibrium reconstructions from the measured flux signals through codes like eFIT, we generally check the consistency near the boundary. I would like to know if the contours match well inside the plasma region or not. I would appreciate if anyone who is aware of such study/comparison/illustration could provide any info. Thanks
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Analytic solutions of Grad-Shafranov equation (quasi-linear elliptic 2D equation) can be found for very limited set of plasma profiles and boundary conditions. So, generally speaking, those solutions are useless for interpreting experimental cases. However, analytics is good tool for numerical procedures checking. Plasma boundary in tokamak is weakly dependent on plasma profiles under the condition that both net current and average plasma pressure are fixed. This property is conventionally used for plasma boundary identification. 2d calculations are nowadays conventional. With this it is reasonable to take boundary from e.g., efit, and play with plasma profiles on your choice. This choice may governed by additional information that may not be necessarily used by efit.
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Hi all,
are there any (analytical) models in the literature which study the adhesion characteristics between two layers?
I am basically coating a substrate (metal) with polymer by using PVD, and interested in studying the adhesion.
Thanks,
Bartu
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Hello, certainly you have tutorials for specific applications. But i am not 100 % sure how far COMSOL will help for your  problem.  COMSOL also  conduct training courses, you will visit their website..http://www.comsol.com/events/?type%5B%5D=course.
Hope it will help you to some extent ..Good luck
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I am trying to do model reduction of power system using Hankel norm approximation for that I need state space model of the system. I tried to output the state space form model analysis in powerfactory in matlab readable file but I am not able to sort it into standard state space form. Any suggestions would be highly appreciated.
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After Digsilent (power factory) simulation, identify the state space results, go to initial calculation, result variable, export, apply file name then execute, ok. execute your results to note pad. Go to matlab work space, input data, change file name, all files, matlab command window, name your data and it's column then enter. e.g A1= data1(:,2) ENTER.   
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Validation of analysis models depends on what is known of the business domains, and such knowledge is by nature partial and specific, if not hypothetical. Nonetheless, even if general proofs are out of reach, the truth of models can still be disproved by counter examples found among the instances under consideration.
I would like some feedback on that approach.
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So you agree: whereas validation is out of reach counter examples can still be used to disprove models.
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I am unable to solve the 3D Poisson's equation of Triple Gate (TG) FinFET device. I had gone through IEEE Trans. Electron Devices paper but in most of the papers, there were only boundary conditions and final equations.
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You can try to find some answers to your questions in IMEC-Academy. Try to visit: https://imec.csod.com/LMS/LoDetails/DetailsLo.aspx?loid=3e1e5d1e-e14b-435a-9086-72189a9a7531#t=1. It is a presentation of FinFET transistor in Sentaurus TCAD. There is a chance that you will find answers to your questions.
You should be registered.
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Can anyone tell me where can I find a library for hybrid transistors (CMOS/SET) for PSpice?
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Is there any case of finding an already designed macromodel for hybrid CMOS/SET transistor?
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Dear All,
I have read in the Generalized Theory of Electric Machines book by P.S. Bimbhara that the speed voltage in the rotor d-axis winding of Kron's primitive machine model is dependent on the rotor q-axis flux, but it does not exactly appear as the mutual inductance. There is defined a term named rotational or motional inductance which is known to be different from the transformer mutual coupling (However, Professor Bimbhara mentions that the difference is not of practical importance). Could somebody please kindly explain where this difference merges from?
Thanks a lot in advance.
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Electric current follow low resistance path, similarly magnetic flux follow low reluctance path. Flux produced by field will mainly follow direct axis path (low reluctance path due to smaller air gap) and will only be responsible to produce EMF/TORQUE, when the salient pole machine work as Alternator/Synchronous motor. The quadrature axis (high reluctance path due to larger air gap) flux can considered only as leakage flux( not useful flux). Using slip test method, you can find Xd and Xq (Xd=Vmin/Imax, and Xq=Vmax/Imin) of given machine. Happy to hear the name of my Ph D, partner at IIT Roorkee.
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Traditionally we validate an analytical model by simulation and validate a simulation model by measurements/testbed.
What about validation of measurement results? Are they 100% accurate?
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We usually validate measurement results using residuals. Residuals are the difference between the values obtained from the measurements and other measurements carried out in different environments. Sometimes it may be necessary to gather repeated data in the same environment or conditions and use them as a basis for the comparison. Plots of the residuals usually give a graphic illustration of the consistency of the data. If the residuals alternate about the zero position (between positive and negative values about zero) then the measurements represents the initial measurement significantly. However a quantitative way to validate the model is to use the RMS errors observed by comparing the two measurement values. If a model was developed from the field measurements, the model can also be validated using the residuals obtained by subtracting the model generated values from the validation data values. RMS errors can also be used. F-test and t test can also provide additional means of checking the model performance.
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Giuseppe Bianchi proposed analytic model for the csma based 802.11mac that can verify the results we get from ns-2. I wonder if there is any analytic model for the TDMA based mac protocol. I want to verify the results I get from the TDMA based mac protocol in ns2?
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Access control methods of TDMA networks can be divided into two kinds. One is central control and the other is distributed control. The operations of MACs of both TDMA networks differ from each other. The paper entitled "Deploying FTTH with Distributed Control and Bus Topology`", which was presented in ICACT 2014, compared the network performances relative to the two methods. It may be useful for your question.
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I am solving acoustic wave equation in frequency domain by Galerkin's weighted residual method. How can I implement absorbing boundary conditions/PML in the formulation?
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Sorry, I overlooked that. I thought you are working on the explicit form. I am not very sure how to formulate pml in week form. Maybe the attached doc can help a little bit.
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I'm looking for the most appropriate modeling methodology to understand how disruptions will affect a supply-chain system.
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Dear Christopher you suggestion have been helpful. I'll check the Moebius manual. Many thanks!.
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In state space representation, with Kalman filtering, say I want to get the errors in states. I have errors in outputs. Can I get the errors in states?
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Laya, I think you mean to describe noise in the state equation. Then, for the sake of optimality, you need to start with the process in continuous time, include the noise components associated with physical sources, and approximate it to be white Gaussian for the Kalman/Bucy filter. For the Kalman filter which is a discrete-time estimator, you need to convert the state linear differential equation to discrete time.
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Antacid Oral Liquids
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In vitro Acid Neutralizing Capacity:
Test Preparation: Shake the container until the contents are uniform and determine the density. Transfer an accurately weighed quantity of the uniform mixture, equivalent to the minimum labelled dosage, to a 250 ml beaker, add water to make a total volume of about 70 ml and mix on the magnetic stirrer for 1 min.
Procedure: Pipette 30 ml of 1 N HCl into the test preparation while continuing to stir with the magnetic stirrer. Stir for 15 min, accurately timed, after the addition of the acid, begin to titrate immediately, and in a period not to exceed an additional 5 minutes.
Titrate the excess HCl with 0.5 N NaOH to attain a stable pH of 3.5. Calculate the number of meq of acid consumed and express the result in terms of meq of acid consumed per g of the substance tested.
[Acid neutralizing capacity, USP/NF 2005, The Official Compendia of Standards, Asian Edition, p. 2304.]