Could ESA deviate and impact a large asteroid again Earth to reduce Earth temperature?

The idea is to use a large asteroid and impact it again the desert to spread some powder at upper part of the atmosphere and create some shadow to lower Earth temperature some degrees. Of course...

08 September 2019 6,954 7 View

What is the fastest learning neural network?

Our fusion reactor Miranda have dozens of parameters to adjust to obtain reactions. Our simulator uses an easy algorithm to simulate our models running 16 threads but it is difficult to change...

09 October 2018 371 7 View

Desalination at 31c$/m3 would be useful for agricultural uses?

We have calculated the end cost of the m3 in a desalination plant with help of our designs. We calculated the cost with 70% of the desalination cost is energy and for a 4kwh/m3. The main problem...

07 August 2018 4,808 0 View

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I am looking ones that works at vacuum. Good thermal coefficient ceramics are OBe and ALN. The first one is poisonous. The second one can be obtained by burning aluminium in liquid nitrogen, but I...

05 June 2018 8,568 2 View

What rules must fullfil a quality paper?

To open the discussion I propose the following rules: 1. Must have an open version loaded at a free and stable site as google or researchgate as long as the knowledge must be shared by the...

31 December 2017 6,796 0 View

Materials for Stellarator like machine?

Pulsotron-500K-Mag has a donut thin form. Outside coils will reach peaks of some dozen kiloamps only (between 1khz and 15Mhz). The problem if aluminium would create eddy current losses, copper...

11 December 2017 9,540 0 View

It is possible to obtain plasma density within 10ns resolution using RF and a magnetic probe?

I should like send RF (>200-Mhz) to a magnetic antenna to look for variation of inductance due the presence of plasma. Theorically 200Mhz should give us enough length and time resolution but I...

11 December 2017 1,359 11 View

How can I measure bullet position in a railgun?

Until now I used railgun technology in pulse fusion tests, but unfortunately we had to move to design space and military railgun launchers Recently I tested a railgun, but I can measure bullet...

03 April 2015 8,091 9 View

Anybody know if derivative with respect a matrix is used before?

In my last technical article that it is attached below, I made derivative of matrix with respect other: dM/dX (where X and M are matrices), I need to know if it is a new concept.

01 February 2015 7,360 6 View

Where can I find superconducting graphene?

I read articles that said that graphene is a superconductor that would revolutionize the world. I need some sheets of that, but commercial graphene specifications are >16 ohms "squared", so a...

09 October 2014 7,446 7 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 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

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

Irradiation data for JAPAN?

Hi, Could you help me to get the latest (2019, 2020) solar resource data for a particular site in JAPAN? PV GIS and NSRDB data are not in reach to JAPAN, I'm looking for some other database for...

03 March 2021 961 3 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 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

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 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

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View