Why the alternator connected to grid didn't loose synchronizm in following condition?

Lets say the grid is at ideal frequency 50 hz then the large load is shut of due to which frequency increases beyond 50 which tends to rotate all turbines faster than their previous speed but at...

08 September 2019 225 2 View

How could i design the negative resistance region of UJT?

UJT between values of Vp and Vv operates in negative resistance region how could i graph this slope with accuracy. Vp is Peak voltage of UJT Vv is valley voltage of UJT

09 October 2017 7,596 0 View

For a medium line model half shunt, the capacitance is lumped at each end of the transmission line. Why?

I want to know why the model behaviour is very close to original structure and why we dont lumoed capacitence only in one side. Put more than two capacitence lump on model.

04 May 2017 4,615 1 View

Why ping and tracert commands works for blocked sites but sometimes do not work for open sites?

Hey once i have run ping and tracert command to my university's website but it does not work then i run above two commands for blocked site in Pakistan it works perfectly well for those so what is...

08 September 2016 4,639 0 View

Why sound waves have analog waveform in books while it is longitudinal waves ?

In signal communication books we make sinusoidal waveform for a sound waves but why we did it we know that sound waves are transverse in nature ?

08 September 2016 6,841 0 View

Double integration for area or for volume?

08 September 2016 4,452 0 View

Billing of electric motors?

Motor is inductive load so how does our electricity residential meters calculate the power consume by motor? Motor needs current to produce magnetic field so that current and voltage would be...

06 July 2016 9,718 8 View

Detuned Reactors usage in PFI devices?

What are Detuned Reactors and why they are used in Power Factor Correction devices.I have found in Schneider Electric website that that they are inductors which are use to control harmonics but...

06 July 2016 4,717 2 View

In the zero bias condition of diodes, why does the minority carrier in n type move to p type where holes are in excess?

03 April 2015 6,795 4 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

How to grow E.coli on the low salt LB agar plate with 50 or 100ug/ml of Blasticidin?

Hello, I would like to ask how to grow E.coli which resists 50 or 100ug/ml of Blasticidin. I have tried many methods by using low salt Luria-Bertain(LB) agar plate. However, no colonies grow. Let...

01 March 2021 2,027 2 View

How to calculate Z (the number of molecules in a unit cell) for calculating theoretical density?

I am trying to calculate the theoretical density of my ceramics materials. I use the formula below to calculate the theoretical density: Theoretical density = (Molecular weight x No. of molecules...

24 February 2021 3,823 2 View

Are there lab markers/pens resistant to Roti-Histol?

Hi, I'm looking for a pen/marker to write on the smooth, transparent (non-frosted) part of microscopy slides which does not get washed away by alcohols and most importantly Roti-Histol. I want to...

24 February 2021 9,902 5 View

I have a problem with kanamycin - why the kanamycin doesn't affect?

Hi everyone, I need to expression of GFP with pET28 plasmid in E. coli BL21(DE3) plysE. Transformed cells have kanamycin and chloramphenicol resistance. Normally, only transformed cells should...

22 February 2021 4,032 4 View

How does elongation affect the resistance of an electrode?

What are the testing rate for electrodes recommended by ASTM for cochlear implants. I am currently doing the 15mm/min elongatio testing.

22 February 2021 1,515 1 View

Resistivity of PVD TiNx thin films vs. N2 flow?

In the PVD of TiN thin films (~100A), I've found the resistivity of the TiN films dropped from ~100 to 60um*cm with N2 flow increasing up to the metallic mode ending point; then the resistivity...

21 February 2021 1,864 2 View

Where can the fault diagnosis data set of lithium battery be found?

Most of the data sets on the network only contain good information about the voltage and internal resistance of lithium batteries. The data of faulty battery is missing. Who can help me, I will be...

21 February 2021 8,659 1 View

What is the reason film thickness increased?

what is the reason film thickness increased when increased doping concentrations give some reasons The measured film thickness is 156, 282, 394, 548 and 681 nm for 0, 1.5, 2.5, 3.5, and 4.5 wt....

17 February 2021 8,987 5 View

How to classify and recognize unseen image class in document sorting?

To sort the scanned document image I have to determine the class of document. But no of classes of image will keep on adding even after training. So at time of inference first I will detect unseen...

16 February 2021 4,501 3 View