Is it easy to handle discontinuities in objective function with mathematical optimization?

Mathematical programming is the best optimization tool with many years of strong theoretical background. Also, it is demonstrated that it can solve complex optimization problems on the scale of...

07 January 2021 8,757 22 View

Hi, Does anyone have a questionnaire about swarm intelligence?

Swarm intelligence (SI) is the collective behavior of decentralized, self-organized systems, natural or artificial. The concept is employed in work on artificial intelligence. The expression was...

03 January 2021 9,050 5 View

Matlab Problem! Please Help?

Hi I would really appreciate if someone helps me out with this MATLAB problem. I have uploaded both MATLAB file (which is not working properly) and the question. Thank you very much in advance #MATLAB

03 January 2021 6,512 3 View

What do you think about improving metaheuristics using mathematical programming?

In recent years, many new heuristic algorithms are proposed in the community. However, it seems that they are already following a similar concept and they have similar benefits and drawbacks....

30 December 2020 5,017 34 View

Inverse analyse for concrete beam?

Hello everyone I want to model a concrete beam containing steel fibers and rebars, since I do not have stress-strain diagram in tensile of the concrete sample. I want to validate from the...

01 August 2020 6,935 1 View

How to calculated thermal resistance on induction motor?

Hi, I want to calculate the circuit of thermal resistance of an induction electrical motor. In some reference they draw circuit that shown resistance. like attached picture. Now i have a question...

19 July 2020 1,682 1 View

How to model Cyclic loading in Atena software?

Dear All I am modeling fiber reinforced concrete in Atena software But as you can see the hysteresis loops do not fit well with the experimental sample How to improve it?

09 December 2019 9,076 2 View

How can I get validated from vortex tube using k epsilon-standard?

Hello.I am working on vortex tube. . The information is attached . I have three problems: 1- Temperature contour and is wrong 2- The mass flow rate of cold outlet and hot outlet is false 3-...

14 November 2019 6,126 1 View

What is the best software for drawing geochemical diagrams?

Hello I have the geochemical data of the XRD and ICP analysis of the lake sediments and have to draw a graph to analyze them. I think Excel charts are not very attractive. What other software...

18 October 2019 192 3 View

Carbon trading and Renewable Energy Certificates (RECs)?

21 May 2019 1,453 2 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

Necessary tube lenght to cool Natural gas in a dry-ice cooling bath?

I have a tank which contains natural gas at 250 Bar and 293 Kelvin. I want to cool the gas in a dry-ice cooling bath to about 195 Kelvin. The gas will flow in a copper-tube through the bath with a...

27 February 2021 8,128 1 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 3 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View

Why do the air flow results vary totally when adding scalar in CFD ?

Dear All, We are using Autodesk cfd to calculate the air flow in a single sided naturally ventilated room, where air flow depends only on buoyancy due to temperature difference between inside and...

25 February 2021 9,602 4 View

Is the a way to contol flow (Flow velocity) without impacting pressure value?

I have a pipe with 10 mm in Diameter and 2 bar pressure, the fluid velocity is 200 m/s, the fluid is air. is there a way to reduce velocity without affecting the pressure value?

25 February 2021 7,187 3 View

Which software is best to analyse multi-phase fluid flows ?

Hello everyone, hope all is good. I want to analyse multi-phase fluid flow through pipe, which software is best to do so ?

21 February 2021 4,230 8 View

Aspen Plus Error: Unknown or undefined bead number?

Hello, in my Aspen Plus Simulation (see attachment) there are two heat exchangers. One HEX1 (oil+gas) ist fed by hot gas which ist coming out of a burner. The other HEX2 (gas+gas) shall work as a...

14 February 2021 8,096 2 View

NVT or NPT is preferable for gas adsorption simulation ?

Hi there, In order to perform molecule dynamic simulation on gas adsorption on substrate materials, NVT or NPT ensemble is preferable ? Thanks!

08 February 2021 173 1 View