Ali Nematollahzadeh

9 Questions 213 Answers 0 Followers

Questions related from Ali Nematollahzadeh

BET instrument, V5 needle valve error?

I am using Belsorp mini BET instrument. During the measurement, in the desorption stage, I face a message saying "V5 (F) needle valve is too tight" and the analysis interrupts. I changed the V5...

20 April 2021 8,772 0 View

Activity of solutions, how to measure?

Dear researchers, Is there any commercial instrument to measure the activity and activity coefficient of protein solutions? Any alternative experimental methods are appreciated. Thanks in advance

05 January 2021 4,603 0 View

LS-50, LS50B, and LS55 photoluminescence difference?

Dear researchers, I would like to find out how different models of Perkin Elmer photoluminescence spectrophotometer, namely LS-50, LS50B, and LS55, compare? For daily use with no need for an...

26 February 2020 5,774 0 View

Different R2 for Linear and non-linear form of adsorption isotherm?

It is well known that in curve fitting of linear and non-linear form of adsorption isotherms on a set of experimental data, different values are achieved for isotherm parameters and R2. What...

18 April 2019 3,360 5 View

Difference between Inductively Coupled Plasma (ICP) and Atomic Absorption Spectroscopy (AAS)?

Dear All, Which one is more accurate, favorable, time-consuming, and cost effective for measuring multiple atoms, ICP or AAS? What are the pros and cons? Thanks in advance

25 October 2018 8,994 9 View

CHNSO combustion/reduction tube from Perkin Elmer 2400 be used for several times of On/Off of the instrument?

CHNSO elemental analysis from Perkin Elmer 2400 has a combustion/reduction tube for 70 analyses. In total we can test about 37 samples and the rest (33 runs) is used as k-factor and blanks. In an...

19 August 2018 7,093 0 View

Can CHNSO combustion/reduction tube from Perkin Elmer 2400 be used for several times of On/Off of the instrument?

CHNSO elemental analysis from Perkin Elmer 2400 has a combustion/reduction tube for 70 analyses. In total we can test about 37 samples and the rest (33 runs) is used as k-factor and blanks. In...

17 August 2018 3,217 0 View

Why does the finite element method gives different results when keeping constant the heat diffusivity (a=k/p*Cp) and changing k, p, Cp?

In the transient heat transfer PDE: d2T/dx2=1/a*dT/dt , a=k/p*Cp k= heat conduction, p=density, Cp= heat capacity For example: if k=1, p=1 and Cp=1, the heat diffusivity a=1. I solve the PDE by...

02 December 2015 5,480 6 View

Rejection of a manuscript after emailing the editor for the expedition of the evaluation process?

Have you experienced a situation where your manuscript has been in the "With Editor" status for an extended period, and despite your request to expedite the evaluation process, the editor rejected...

01 January 1970 2,763 0 View