What is the vacuum impedance ?

Can I consider vacuum as a space free from em waves or gravity waves ? If not why such a space can't exist ? And what do we mean by electric impedance of vacuum to to 273 Ohm or something like...

05 June 2019 177 4 View

Os there any geometrical representation of impedance of parallel L, C, R circuit ?

We know the complex plane representation of impedance of L,C,R. If there is a tank circuit, a capacitor in parallel with an L and R and that is connected with an a,c voltage source. Can we...

05 June 2019 1,040 1 View

Is there any analytical Method to calculate the change of XRD pattern with change of impurity?

I have the XRD data for pure BCC Iron. Now I want to change the pure iron by adding carbon with different percentage. Now is there any theory of variation of XRD pattern with the variation of...

04 May 2019 5,910 5 View

What should be the thickness of antireflection coating ?

Coating is used for different purposes. When one face of beam splitter is coated with silver . Reflection of light guided by silver coating will face a pi phase differene or not ? Does this depend...

04 May 2019 5,092 6 View

What is the wavelength used for XRD ?

I am just entering into this subject . I have seen different XRD data without supplying the value of wavelength of X-RAY used . Is it that the value of wavelength is implied? One XRD machine...

04 May 2019 3,168 10 View

What is the theory of 2D XRD ?

As an optical grating , if we think a 2D lattice structure, then I thin Bragg's formula can not be used directly. May be I am wrong. I think in this way because in Bragg's formula "d" I'd there...

04 May 2019 9,090 1 View

Why EM waves are not deflected by Electric or magnetic fields ?

EM waves are basically vibrating electric and magnetic fields. So it seems that em waves should be deflected by Electric or magnetic fields . But I think it doesn't happen. Please explain the...

04 May 2019 4,487 6 View

Does dielectric discharge voltage depend on shape of the electrodes ?

Dielectric discharge voltage of air is 3 KV/ mm. So if two conducting plates are kept with a potential differene of 3kV and placed at a distance of one mm then air discharge will happen. If the...

04 May 2019 6,947 2 View

Why don't we use focusing lens for X-RAY diffraction ?

In Fraunhoffer diffraction we use optical lens for focussing the diffracted light to meet at different points of maxima or minima. For X-RAY diffraction we don't. ALSO FOR LASER DIFFRACTION WE...

04 May 2019 8,234 6 View

Why different XRD peaks have different intensities ?

In X-Ray diffraction a maximum occurs where all the scattering centres contribute constuctively . This comes from Laue equations. Still peaks are of different intensities. Can this intensity...

04 May 2019 4,144 21 View

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

03 March 2021 8,272 1 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 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

Why can't make aluminum nitride film successfully by use sputter?

We use reactive sputtering process to make aluminum nitride film, and want to make c-axis aluminum nitride film on a silicon substrate, but the crystal orientation cannot be seen with...

03 March 2021 7,975 3 View

How two melting peaks in DSC of polypropylene can be merged into one crystallization peak?

The figure shows DSC cooling (blue) and 2nd heating (green) curves (step: 10 K/min) for a commercial sample supplied as Atactic Polypropylene (APP). The heating curve illustrates two major...

03 March 2021 5,857 3 View

Is there any test to determine the cardiovascular risk of patients with obesity? from the perspective of obesity?

We found tests to determine cardiovascular risk taking into account lipid profile, blood pressure, age, history of diabetes, other laboratories. But when weight is involved, there is a paradox. I...

02 March 2021 6,036 1 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

Sutter electrode holder leaking after applying positive pressure. How to fix?

I am using a Sutter electrode holder for my patch clamp experiments, but I'm having trouble keeping positive pressure inside my electrode due to a leak out of the back of the holder. I have added...

02 March 2021 5,829 1 View

Research on Supply Chain Management in Indian context?

Hi, I am planning to apply for the PhD degree in the Supply Chain Mgt. with specific area of "Cold Storage warehouses" during Pandemics and wars. Where lock downs and shut downs are frequent....

02 March 2021 285 2 View