What are the advantages and disadvantages of analytical and semianalytical methods over numerical methods like FEM and FDM?

What are the advantages and disadvantages of analytical and semi-analytical methods over numerical methods like FEM and FDM? I am looking for detailed advantages and disadvantages.

31 December 2018 7,984 3 View

How to define a position dependent loading in Ansys?

How to define a force, function of displacement and time derivative in Ansys transient analysis, for example the forced vibration problem of cantilevered beam with a dynamic f(x,t) force acting at...

09 October 2018 6,311 0 View

Could anyone suggests some experimental researches (results) of free vibrations of laminated composite plates fully covered with piezoelectric layers?

Could anyone suggests some experimental researches (results) of free vibrations of laminated rectangular composite plates fully covered with piezoelectric layers?

07 August 2018 4,784 2 View

Do external voltages exerted on electrodes of piezo-layer affect the natural frequencies, or they play the role of external load?

Consider a single piezoelectric layer (plate), polarized in its thickness direction and a top and bottom electrodes with nonzero external voltages exerted on them. Do this external voltages affect...

05 June 2018 4,918 4 View

Frequency inconsistencies in rectangular composite plate?

04 May 2018 2,929 0 View

Could Rayleigh-Ritz method be used for vibration analysis of Forced vibrations?

Could Rayleigh-Ritz method be used for vibration analysis of Forced vibrations? For example in forced vibration of a plate under general time varying loads.

09 October 2017 8,028 3 View

What is the value of shear correction factor for (piezo)composite plates?

08 September 2017 4,514 3 View

How to find close form inverse of a large symbolic matrix in Matlab?

I have a big 1000*1000 symbolic matrix (some of its diagonal entries are function of x variable), is there a trick way to calculate closed form inverse of a such matrices in Matlab or Maple?

08 September 2017 4,307 4 View

Is there any commercial FEM software package that has shell elements to model piezoelectric materials?

08 September 2017 1,478 4 View

How to implement short circuit and open circuit B.C on a piezoelectric patch in ANSYS?

I want to analyse the free vibration of a piezoelectric patch at open and short circuited condition in ANSYS. Do you know how to implement short circuit and open circuit B.C on a piezoelectric...

06 July 2017 5,682 1 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

Should we change media after1st 6hrs after plating HUVEC bought from INVITROGEN?it's not recomended by invitrogen.Will DMSO present in stock matter?

We have HUVEC bought from Invitrogen. Cat no -C-003-5c. while first plating the cells we have bought the protocol suggests not to centrifuge the cell with media to remove the DMSO. Should we...

02 March 2021 3,713 2 View

How to normalise data on OPM package from R Studio ?

Good afternoon, I recently used OmniLog from BIOLOG for my experimentations : I tested the metabolism of different strains on 2 types of plates. I have 16 strains of 3 different groups...

02 March 2021 3,584 1 View

Is it possible to do piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch?

How to do Piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch? Piezoelectric coupling between the rectangular substrate and rectangular...

02 March 2021 9,833 3 View

Can we distinguish the type of free fluid inside the pelvic and abdominal cavities whether blood or serous fluid using the ultrasound?

during ultrasound examination of acute abdomen, sometimes we see free fluid , can we know the type of fluid ,whether blood or not , using ultrasound only? if yes , what are the sonographic...

01 March 2021 7,476 4 View

Benefits of the 24 welled plate?

We have always used the 96 welled plate, the 48 welled plate but apparently there is much evidence on the 24 welled plate and above all its benefits.It states it is the same you would use on ELISA...

28 February 2021 1,149 1 View

Can bacterial suspension be pipetted directly onto petri dish and agar poured onto it?

Hi, recently I encountered a protocol for plating which was not the usual method I have been practicing (pour LB agar onto plate, allow it to solidify, pipette bacterial suspension onto plate,...

28 February 2021 7,292 3 View

How to calculate Ligand-active site distance in a ligand-protein complex from MD simulation?

I have run a MD simulation of a ligand-protein complex in GROMACS using CHARMM forcefield. Reviewer has asked me to calculate Ligand-activesite distance and binding free energy of ligand with...

27 February 2021 4,703 1 View

What is the best surface to culture cells isolated from a skin biopsy?

Hello, recently I am having some difficulties with maintaining the cell culture of primary cells isolated from a skin biopsy (normal and malignant). The coating of culture plates with Matrigel (a...

26 February 2021 6,151 2 View

Difficulty in cloning of 1kb gene into vector?

I am facing difficulties in cloning a 1kb gene into a vector (pJIT163). I have my gene on interest (GOI) in pUC57 and want to clone in pJIT163 using SalI and BamHI restriction sites. I am getting...

25 February 2021 3,221 7 View