Which is the best machine learning method for topic extraction from large document collections?

I want to know about different algorithm/method/inference to extract underlying topics/themes from documents/scientific article etc.

12 October 2020 5,911 3 View

The porous nature of the material should show up in the impedance behaviour in terms of inductance element?

The porous nature of the material should show up in the impedance behaviour in terms of inductance element. I do not see any value given for the inductance at the interface in these plots which...

01 October 2020 7,504 2 View

Is there any way to separate MoS2 QDs from MoS2 flakes?

I have tried to exfoliate MoS2 via liquid exfolaition method(using NMP as well as Ethanol/water mixture as solvent) . Always Iam getting MoS2 nanoflakes and MoS2 QDs. Is there any way to separate...

03 February 2020 6,771 1 View

I want to coat Ionic liquid over Fe3o4@Sio2. I have very concentrated only 0.19g of ionic liquid. Does anyone have idea how can i do it?

I have successfully coated the Fe304@Sio2@PPy( Polypyrrole) simply by taking 100mg Fe304@Sio2 ,suspended in 15 ml DI water then sonicate for 15 min then add 100 microlitre pyrrole. Solution was...

13 January 2020 8,206 5 View

Wether it is possible to dissolve Amyloid beta 1-40 monomer with phosphate buffer or do we need to HFIP?

I have Amyloid beta 1-40 monomer using which i need to perform biophysical characterisations.

16 September 2019 4,472 3 View

Support vector machine or neural network, which techniques is better for image classification problem?

pattern classification is a popular problem area, there are different methods available to do it.

16 September 2019 3,549 3 View

How the sampling is done in cohort,case control and cross sectional design ?

how the sampling is done in cohort,case control and cross sectional design ?

14 August 2018 830 5 View

Data Required

Hello friends, I need to know how to get the data if you are researching on supply chain. I am looking for costs and other inventory data for retail chains of India. How to go about it?

25 May 2017 783 3 View

Instead of osmium tetroxide is there any other substance that can be used as a secondary fixative for electron microscopy of bacterial cell?

25 September 2016 9,374 4 View

Hi..Can I induce protein expression in pTZ57R/T vector using IPTG?

Hi..I used pTZ57R/T vector for cloning my gene of interest. Is it necessary to subclone the gene into an expression vector to see the protein expression ? can I induce the protein expression in...

17 April 2016 4,648 4 View

Have someone successfully used the ER alpha (Santa Cruz sc-8002) antibody in immunostaining ?

Santa Cruz now recommends this new antibody (F-10) but I can't find a publication using this reference. I'm working on human et non human primate hypothalamus and so far, it doesn't work. Is...

02 March 2021 10,003 2 View

Energy minimization in LAMMPS using NVT ?

How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...

01 March 2021 2,294 3 View

In frequency domain alpha band(8-16hz), beta band(16-32hz), gamma band(32-64hz), sub-band(64-128hz) are same as LL,LH,HL,HH in wavelet decomposition?

I am working on single trial motor imagery data i.e. EEG data. I am following a paper which has a dataset from BCI challenge IV (dataset 2b). After removing noise and extracting all the data from...

23 February 2021 5,503 1 View

Online surveys for social sciences researchs: what are your opinions about this tool and how can we improve the research design to incorporate online?

Good morning everyone, Due to the pandemic, I conducted several online surveys. It is quite agile, not at all expensive, but there are several problems: the sample's representativeness and its...

21 February 2021 7,457 3 View

MVN, how to conciliate contradictory results from Multivariate normality and Multivariate outliers test?

Dear colleagues, I'm working with Path analyses in lavaan and MVN packages. There are some results that for me are confusing and features from the MVN that I do not know how to set. My dataset is...

18 February 2021 190 3 View

Is it possible to obtain a negative cronbach alpha?

Good evening everyone. If a questionnaire has 4 factors measuring different constructs as for example CAMI questionnaire measuring attitudes toward the mentally ill that has four factors:...

18 February 2021 3,223 3 View

Any information about dinitrosalisylic acid reagent end point color stability ?

I work on estimation of alpha amylase activity using dinitrosalisylic acid reagent If i put the reagent to stope the enzymatic reaction and allow the reagent to react with the produced reducing...

17 February 2021 7,402 4 View

ZnS oxidizes to ZnO!!why??

when I put my ZnS solution in the chemical bath, the ZnS oxidizes so there are ZnO peaks appearing because of the reaction with the oxygen in the air, despite the fact that I close the beaker...

14 February 2021 5,778 9 View

Hi, can a variable in a questionnaire be measured with a series of questions or it has to one question for one variable?

I am doing research on the impact of competitive bidding on project success and would like to use SEM. Project success shall be: cost overage, completion time, quality of works and variation...

13 February 2021 4,413 6 View

Can we have constructs of Cronbach alpha value with more than 0.9 in social science research? What is recommended in this problem?

My study consists of a conceptual framework with seven constructs measured in seven point Likert scale. According to pilot study, only three constructs have Cronbach alpha value more than 0.9...

12 February 2021 9,368 2 View