XRF analysis of 45s5 analysis?

I've sent my synthesized 45s5 powder and a commercial 45s5 powder to XRF analysis but in both of them the amount of Na2O is about 15 percent and LOI is around 40 percent and it makes the aount of...

29 January 2021 239 4 View

Sol-gel synthesis of 45S5?

I've synthesized 45S5 bioglass by sol-gel method and my XRD and FTIR results are similar to 45S5 bioglass but my EDX result has differences and instead of Si and Na the amount of Ca is higher....

29 December 2020 4,847 2 View

Sol-gel Synthesis of hydroxyapatite?

I use Ca(NO3)2.4H2O and P2O5 as precursors and Sol-gel method to synthesis my powder but the CA/P ratio is more than stochiometric (167) and my powder is dark. Does anyone know why this happens?

27 December 2020 1,574 5 View

Could anyone help me with this error Exception has occurred: ValueError?

I have downloaded monthly mean wind speed of terraclimate data for 20 years (2000-2019) which have NetCDF format, but unfortunately, each year has a single NetCDF file, and I want to merge them...

25 November 2020 8,477 2 View

Has anyone used Breaks For Additive Season and Trend for decomposing the time series into trend,and season in R package?

12 September 2020 1,513 3 View

How show NDVI MODIS index (MOD13A1) in Arc GIS?This collection of MODIS has calculated NDVI index and i want to show this index in my study area?

This collection of MODIS has 2 options for calculating NDVI index. First, we can calculate it from NDVI formula or we can use NDVI index that MODIS has calculated. I use both of them but they are...

25 August 2020 2,419 3 View

Has anyone used Maximum likelihood or Support vector machine (SVM) for image classification?

Hello I'm working on a project that I want to detect forest and deforestation areas. I need some information about Maximum-likelihood or Support vector machine (SVM) for image classification.

22 August 2020 1,896 3 View

How we can use the Transmisivity of light colors (rtn, gtn, and btn) in simulating a coated glass with red dyes in Radiance?

We want to simulate a red coated glass in Radiance. The UV-VIS spectroscopy analysis was conducted and optical characteristics of the red glass including transmittance and absorbance were...

16 March 2020 3,492 5 View

Model game as a discrete-time Markov chain?

Model game as a discrete-time Markov chain

30 December 2019 5,346 3 View

How can i remove fat from alkaloids?

sometimes i have problem with fat in my extracted alkaloids using ethanol and chloroform for extraction. Also my alkaloids are not well dissolved in acidic water, so acid-base precipitation...

09 December 2018 2,737 5 View

can I treat waste water containing solvents and alcohol with electrocoagulation?

there are solvents and alcohol in the waste water of a factory that produces disinfectants. Increasing this waste water requires very serious operations. Can I treat this waste water with...

27 February 2021 2,609 3 View

Which transition metal salt precursor is best for doping? Why?

I would like to synthesize a transition metal doped TiO2 via solgel method. Hence, I would like to know which metal salt precursor to choose among Chloride, Nitrate, and Sulphate. A clear...

27 February 2021 4,285 3 View

When I reacted Bidentate NS Schiff Base with metal salt (M-Cl2) in +2 oxidation state in proportion of (2:1) , getting sticky product ,, why?

When I reacted Bidentate NS Schiff Base with metal salt (M-Cl2) metal chlorides in +2 oxidation state in proportion of (2:1 Schiff base &metal salt) , i was get sticky material Why ? ---~...

21 February 2021 7,970 5 View

What is the right way to conjugate two acids?

How to conjugate two acids with amine linker?

18 February 2021 4,083 2 View

How to get the heading of real-time credit card dataset ?

I am working with the Credit card dataset. I am aware of the fact that the Banks and financial institutions do not share the dataset with third-party companies or researchers. I just need to know...

18 February 2021 9,186 3 View

Mixture neutralization after Boc deprotection ?

I am performing a Boc-deprotection with HCl in organic solvent (dioxane or Ethylacetate) but would like to isolate the free amine. Several problems: - Neutralizing with inorganic base as NEt3...

18 February 2021 3,366 3 View

What is the role of ether solvent (such as THF) in Sonogashira coupling?

Can Amine (such as Et3N) be used as solvent as well as base for the Sonogashira Coupling? How to decide the amount of solvent to be used in any reaction? Does the amount of solvent affect the...

14 February 2021 4,018 3 View

Which non-coordinating solvent dissolves anhydrous Iron(II)chloride?

Hallo, i am looking for a non coordinating solvent that dissolves anhydrous FeCl2 for a synthesis in which i can not use solvents like thf, pyridin etc.. I already tried benzene (no solubility),...

11 February 2021 6,105 1 View

Do we have any empirical model to model the combined effect of carbonation and chloride attack in concrete concerning climate change?

Do we have any empirical model to model the combined effect of carbonation and chloride attack in concrete concerning time-dependent temperature, relative humidity and concentration of carbon dioxide?

08 February 2021 4,277 1 View

Can we help fellow mathematicians get free ?

https://terrytao.wordpress.com/2021/02/08/a-statement-from-mathematics-department-faculty-at-stanford-and-mit/ Terry Tao blogged about this unfortunate event. Kindly share among Mathematical...

08 February 2021 1,055 3 View