How can I make unsupervised clustering of trees species using algorithms like HAC, Kmeans... in R?

I am working on the development of multi-species volume allometric equation from diameter (DBH). I would like to form groups of species with the largest possible volume-diameter correlations by...

19 January 2021 5,752 5 View

How can I build a crystal model(Beta-silicon nitride) in VESTA?

I will make an atomistic simulation of the beta-silicon nitride phase with the GULP code in order to obtain its structural, mechanic and thermodynamic properties; I would like to use fractional...

16 July 2019 4,819 3 View

Where can i find good resolution imagery (remote sensing, DEM) for Gange river basin ?

I must first collect some data of the Gange basin (6 states), India. I find SRTM data for DEM, and look for hydrologic vector data, and good remote sensing imagery. Thank you for your next...

24 March 2019 3,557 4 View

Nature of a white cloudy floating layer observed during HeLa lysate centrifugation ?

Preparing Lysate of HeLa cells (1E+6 in 0.5mL lysis buffer 1.5mL eppendorf tube) by standard chemical lysis (RIPA like buffer) during the 12000 RCF centrifugation step (clarification) I noticed a...

28 October 2018 2,035 2 View

Pairwise.t.test after lmer: is that right?

I used the following model: model1= lmer(A~B*C+(1|block)) where A is a quantitative (continuous) variable and B and C are qualitative ones, with respectively 3 and 4 levels (A and B are crossed, 1...

06 October 2016 382 4 View

Hello, i am doing clonogenic assay but my cells appear dot like(form is not covenient) can someone help troubleshoot?

i seeded 1000 cells and it has been 2 days, what to do?

04 September 2016 1,857 5 View

Do you have pictures of the experimental setup for electrophysiological recordings of the moth's auditory circuit?

17 November 2014 9,841 3 View

Why are plant meristems always virus free ?

When plant breeders want to re-generate plants that are virus-free using asexual multiplication (in order to obtain clones of the primary unhealthy plant), they often collect the apical meristem...

23 October 2014 7,040 16 View

In optomechanics, when the ratio k/w_m is < 1, should the ratio (in absolute value) between the linear and quadratic couplings also be < 1 ?

02 September 2014 5,123 2 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

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 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

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

Defining mixed model with repeated measures data?

HI all, I have been working with daily diaries data ( 6 emotions of which 3 positive and 3 negative) were assessed for 30 days. These observations (1level data) are then nested within subjects...

13 February 2021 1,810 3 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

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

How to simulate Sloshing water using Dynamic mesh in ANSYS Fluent ?

I am trying to model sloshing water in a tank in ANSYS Fluent using Wall motion. BUT it seems that System coupling is not responding to wall motion and it works only with Dynamic mesh.

20 January 2021 2,963 3 View

Can you tell the pros and cons of the proposed active AC coupling circuit?

Are there analog circuit designers? Here is a small task for you. The active circuit below aims to improve the AC coupling in the biosignal amplifiers. Is that so? Are there any pros? I'm...

17 January 2021 3,548 14 View