Analytical Modeling - Science topic

I want to demonstrate the vector transmission-line equations (2.16) and (2.17) from Sergei Tretyakov's book "Analytical modeling in applied electromagnetics" pages 18-19. Any help please.

There is research into the models individually, but not one seeking to find an overall best one suited for any condition.

I am writing to request assistance in obtaining the contact information of a researcher whose profile is listed on ResearchGate. The researcher in question is Abhinav Gupta is waiting for your full-text, and their profile URL.

As part of my ongoing research project on [Review on Design and Analytical Model of Thermoelectric Generator], I am very keen to discuss potential collaboration opportunities and exchange insights with [Abhinav Gupta]. Having access to their contact details would greatly facilitate this process.

I understand the importance of privacy and data protection and assure you that any contact information provided will be used solely for the purpose of academic collaboration and will not be shared with third parties.

Thank you very much for your assistance. I look forward to your positive response.

Dear researchers,

I would like to ask you whether the retention of analytes of interest on the C18 column can be slightly affected by buffer concentration.

I have analyzed a mixture containing sulpiride (weak base) and diclofenac (weak acid) at 250 ng/mL on the C18 column with mobile phase A: ammonium formate and mobile phase B: methanol.

I have observed that when the concentration level of ammonium formate increased from 2mM, 5mM, to 10mM, the retention time of sulpiride slightly decreased from 6.72 min, 6.52 min to 6.46 min respectively, whereas that of diclofenac slightly increased from 10.04 min, 10.17 min to 10.28 min respectively.

As far as I am concerned, for a basic compound such as sulpiride, an increase in buffer concentration (ammonium formate) can result in a decrease in silanol activity so a positively charged compound such as sulpiride can have a slight loss of retention due to the ion exchange interaction between the compound and silanol group during a loading step. Consequently, the retention time of sulpiride was slightly decreased with an increase in buffer concentration.

However, for an acidic compound such as diclofenac, it is quite difficult to explain this phenomenon. In my opinion, it seems that when the concentration level of ammonium formate increases, the pH of the mobile phase slightly increases so the charged state degree of diclofenac slightly increases either. As a result, the energy configuration of diclofenac diffusing inside the pore of the C18 column is lower at a higher concentration level of ammonium formate (10mM) so it will have more interaction surface area with the C18 column, leading to more retention. However, this explanation seems not to be convincible because the higher charged state degree of diclofenac is, the more soluble is and the less retention is.

However, for the retention behavior of sulpiride and diclofenac, the above explanations are just my own opinion. Of course, I am not sure whether they are right or wrong.

If someone here can help me clear the retention behavior of sulpiride and diclofenac, I am really happy to listen to your valuable suggestions.

Thank you so much in advance,

I am doing an analytical modal analysis based on CPLT and Ritz polynomials, is it any way to correlate the obtained natural modes to their corresponding ones from numerical modal analysis of the same structure ?

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.

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?

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?

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

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.

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?

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.

Anybody knew how to prepare analytical modeling of a permanent magnet synchronous motor using Matlab code?

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.

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

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?

Thank you

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.

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?

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"

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.

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?

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.

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!

We have developed a floating point architecture, but it has been asked us to analytically justify the performance efficiency of our architecture.

Thank you

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

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

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.

I want to know about extraction of barrier height using silvaco atlas tool for schottky barrier mosfet simulation.

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 .

Can anyone help me to know about the analytical model for prediction of wear in sprockets.

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 

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.

The telecommunications data transmission analysis requires analytical modelling techniques to ass the Quality of Service Provision.

Dear,

In various research papers related to this topic (for example:

it can be seen that the gate potential is shown with Ψ_G that is given by:

Ψ_G=V_G - Φ +X+E_g /2q

my first question is about the unit of components in above equation,

V_G (in volt) , workfunction Φ (in Volt) , electron affinity X (in volt) and E_g (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:

Q_i=Ψ_Gi +(qN_it_si)/(2C_ox) 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 Ψ_G1 and Ψ_G4 equation?

4-In Q_i is (qN_it_si)/(2C_ox) negligible against Ψ_Gi ?

Best Regards

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.

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?

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.

I am into modeling of nanowire transistors

We welcome MPH students in Sweden and outside Sweden using SAGE, SAGE-INDEPTH, SAGE-HIV WOPS, or any data sets to engage on this project - add yourself as a contributor, and contribute to the discussions here.  Use this as a portal to ask questions, raise issues with data and analyses, and engage with other data users.

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.

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 2² to 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.

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?

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

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!

The IMF has only forecast data up-to 2021. What analytic model can I use?

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

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

I wish to make sure that the model we are building will suit the highly selective criteria of MS.

This assumption is the main difference between Warren and Root models.

 When are multi-layer cellular neural networks the same?  

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.

Veterinarian-client-patient discourse

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

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.

I want to do modeling of compliant XYZ stage using flexure based compliant displacement amplifiers. Also for synthesis which book shall I use?

Can someone provide analytical model for relating the thickness and the curvature of a masonry arch (with internal steel reinforcement) to the applied load? 

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

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

I want to know the parameters for drafting an analytical model of performance of a disk controller visualized and virtual machine running on it. 

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!

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.

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

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.

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.

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.

Can anyone tell me where can I find a library for hybrid transistors (CMOS/SET) for PSpice?

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.

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?

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?

I'm looking for the most appropriate modeling methodology to understand how disruptions will affect a supply-chain system.

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?