Analytical Modeling - Science topic
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Questions related to Analytical Modeling
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.
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.
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?
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?
I've been trying to simulate a NCFET using the approach suggested from " 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  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  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.
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
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 .
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
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”.
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.
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.
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 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?
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,
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!
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)
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.
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?
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 .
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?
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.
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.
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:
Qi=ΨGi +(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 ?
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.
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.
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!
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
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?
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.
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 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?
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.
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 ?
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!
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.
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 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?
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?