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

Estimate / Predict remaining useful life of a bearing without data of previous failure?

Hello, I am trying to write a program in Matlab to estimate the remaining useful life of a bearing without data of a previous failure. Do you think this is possible? I was thinking to use the...

27 November 2020 9,863 3 View

Two way ANOVA with non normal data?

Good afternoon everyone. I would like to know your oppinion or advise for the following: I would like to compare the results of a variable measured with a likert scale. I have two (or three)...

19 October 2020 4,564 4 View

Comparing two independent groups with very different sample size?

Hello eveyone. I would like to know your oppinion on the following. Do you think that it is adequate to compare two groups with very different sample size and non normal sample distribution? for...

19 October 2020 8,475 4 View

Total Alkaloid Content?

Can someone suggest a simple calorimetric assay protocol for determination of total alkaloid content of plant extract?

10 September 2020 8,835 3 View

What are the environmental problems caused by phosphorus pollution ?

What are the environmental problems caused by phosphorus pollution ?

27 July 2020 948 34 View

What are the harmful effects of nitrates higher concentration on public health?

15 July 2020 3,900 10 View

What are the best methods of water management in the case of an agricultural drought ?

The importance of water resources is evident, and its management through all levels is imperative, especially in arid and semi-arid countries where water demand is highly required for irrigation...

10 July 2020 6,153 7 View

What are the advantages of using renewable energies for the desalination of seawater?

what are the advantages of using renewable energies for the desalination of seawater?

28 June 2020 6,093 3 View

No title

Dear colleagues, I have analyzed the crystallinity of photocatalyst material (without calcination treatment and calcined samples) using XRD in two place XRD analysis services in my campus. When I...

26 June 2020 436 13 View

Does the pressure(-600 mmHg) affects pH?

When I conducted the degassing experiment using decompression under anaerobic condition(and I used ferrous based chelating agent), the oxidized ferric were observerd. So, could you tell me the...

03 March 2021 4,892 5 View

I need to image mesoporous silica nanoparticles that are in ~100 nm size and do high resolution TEM to look at mesopores. what grids should I use?

Need to image mesoporous silica nanoparticles using the TEM. Also, need high resolution TEM images to see the mesoporous structure. Kindly suggest what kind of grids to use. Thanks, Shatadru

02 March 2021 1,787 2 View

Can chitosan alone can act as a reducing agent for Cu(0) nanoparticle sythesis?

[Synthesizing Cu nanoparticles without using chemical reductants]

01 March 2021 8,359 1 View

What are the new 2D nanomaterials were used for Silver nanoparticles stabilization?

In the stabilization of AgNPs are vital in current research interest. However, some of the 2D nano-materials like graphene oxide, MoS2, etc... previously used to stabilize it. But still they shown...

01 March 2021 2,207 3 View

What is the state of the drug inside solid lipid nanoparticles (SLNs)?

I am a little confuse with the mechanism of solid lipid nanoparticles (SLNs). The main point of encapsulating drugs into SLNs is because some drugs have low solubility in water. Therefore, SLNs...

01 March 2021 3,703 3 View

How to check the uv-vis absorption of nanoparticle by surface plasmon resonance?

I try to check the uv-vis absorption of Indium nanoparticle. Now I am measuring in solution, can I measure it in the form of a film?

01 March 2021 930 3 View

Distribution of particles in metal matrix?

How would define the "good" and "poor" distribution of particles within the matrix. Is there a quantitative solution to assess the distribution of the particles, which then having denotation of...

28 February 2021 7,397 8 View

How can I calculate the rdf of water molecules around 'Na' ions that are closest(adsorbed) to the nanoparticle(solute)?

Hi, I want to calculate the radial distribution function for water molecules around the Na+ ions adsorbed on the surface of a spherical nanoparticle using the gromacs trajectory dynamically? For...

28 February 2021 5,650 1 View

Which database would give me this list of chemical components?

Dear colleagues: I would like to know if anyone knows of a database that gives me the parameters pH, K, K, Mg, P, C, N, Zn, Cu, Ni and Cd of common foods. I find a lot of information of proteins,...

26 February 2021 5,525 3 View

LEDs on Vis Light photo degradation of MB water sol via N doped TiO2 in a mini flume?

Good day to all, I have no experience with light emitting diodes. I am building a glass mini flume to demonstrate the photo degradation of Methylene Blue in water running over self cleaning...

26 February 2021 4,026 5 View