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

Experiment statistical analysis?

07 February 2021 3,635 3 View

Why Selenium nanoparticles synthesized by PEG 200 could not be scaled up ?

I could not synthesize Selenium nanoparticles by PEG 200 at up-scale ( more than 100 ml) as it got aggregated while at small amounts it works fine , I work with 850 PPM using selenium powder in...

08 January 2021 10,049 1 View

How to read forces from a file and apply them to a specified nodes in ANSYS APDL?

I want to apply different forces for every node. These force values are saved in .txt or .csv file. Can anybody help me to do that using APDL command. I attached Ansys input file for my model and...

15 November 2020 2,883 1 View

Which should be used for Anxiety : unselective beta blocker or B1 Blocker ?

which would be more effective in treatment or protection from Anxiety : unselective beta blocker as Propranolol or selective beta-1 adrenergic receptor antagonist as Bisoprolol ?

15 November 2020 7,994 2 View

How Abaqus can generate lumped mass matrix with non zero values only at the diagonal ?

Hi everybody I generated mass matrix by Abaqus, but it has nonzero off diagonal values. I need to get lumped mass matrix with nonzero values only at the diagonal. In Ansys I can turn Lump on...

28 October 2020 5,960 4 View

No title

I searched a lot for a generalized equation or an algorithm that can be implemented on MATLAB. However, all that I found still theoretical analysis. Can you help with the algorithm or the code for...

24 August 2020 8,117 7 View

How to know coationg efficiency of nanoparticles?

If I'm trying to coat ZnO nanoparticles with Silica, how to know how much of ZnO is coated? (coating efficiency)

29 July 2020 1,813 13 View

Extraction of CoA linked to Acyl chains?

I am in need for a protocol dedicated to the extraction of CoA-acyl chains from plant extracts.

17 May 2020 3,459 1 View

What are the alternatives for horizontal bracing system?

There is a steel pipe rack with normal framing system including horizontal and vertical bracing systems, all the connections of the horizontal bracing are defected, for some reasons it is nearly...

29 February 2020 1,583 3 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

How can you bring two structures together to create an adhesive bond in LAMMPS?

I have created an Ice 1h crystalline structure and an Aluminium substrate structure and equilibrated both at 250K. Now I need to bring them together in a way that an adhesive bond is created....

01 March 2021 3,325 2 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

How can you tell if your organotypic slice culture is healthy ?

I'm working on organotypic cerebellar slice cultures from postnatal rats and I'm not sure how to tell if the slices are healthy at any given point. I know there should be a lot of microglial...

15 February 2021 2,830 2 View

How to raise temperature in small increments during equilibration in LAMMPS?

All, I am trying to equilibrate an Ice 1h crystalline structure to 250K in LAMMPS. When I tried to do this at 250K directly, the structure lost it's crystalline shape and became disordered post...

14 February 2021 5,747 2 View

Reaction condition to convert NH2 to COOH?

I need to couple Dopamine by NH2 end to silica nanoparticles coated by PEG-NH2, but first i need to convert the PEG-NH2 to COOH by using succinic anhydrous ... can you suggest a reaction condition ?

13 February 2021 2,768 4 View

Coupled hydric and mechanical equation COMSOL?

hello i am trying to study the mechanical deformation due to the humidity on a 3d volume formed of 2 phases. my equation are dw/dt =grad(Dm*div(w)) and the mecanical is sigma=E*beta*nabla(w)....

27 January 2021 5,201 1 View

Should the Ice 1h crystalline structure be lost during equilibration process in LAMMPS?

I have created an Ice 1h structure and am equilibrating it 100K in NVT ensemble in LAMMPS for a timestep of 0.25fs in 3000 steps. The potential used is TIP4P/Ice. Although the simulation runs fine...

26 January 2021 9,603 11 View

In abaqus, how to couple a reference point to a discrete rigid body?

I have two discrete rigid bodies. A axial connector was established to connect two reference points. Now the task is to attach the reference points to the respective rigid part. How should I do...

25 January 2021 5,079 3 View

How exactly modes are coupled into asymmetric directional coupler?

Currently I am reading one research paper regarding silicon based two and four mode division multiplexing for optical data transmission in 2 micrometer waveband. While reading I stuck at one...

21 January 2021 5,864 4 View