Calculating solar rayonnement in a given locality: what formula do I take into account?

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What is the best method for tracking the sun position, is-it by solar position calculation along the day of the year or by other method?

In solar energy application, often we should know the sun position at each instant. With the sun position calculation, I think we can establish a database for this purpose. Then we can use-it for...

31 December 2014 7,382 12 View

In multilayer PV solar cells, how can I choose the materials (gap and contact type) in order to increase efficiency ?

When the PV solar cell is used in a multi layer form, the goal is to benefit of a large interval of solar radiations. I think that the gap and the contact of different layers must have certain...

31 December 2014 3,671 4 View

What is the energy value of a phonon generally measured in an indirect transition?

Is it possible to obtain a phonon energy of about 425 meV, or is it an indirect transition assisted with more than one phonon?

11 December 2014 6,356 1 View

There are much old films which are colored later. How we proceed to retrieve the suitable color for original picture ?

There are much old films which are colored later. The obtained result seems to be satisfactory. The colors can be different from the originals but it is sufficient for mistaking the human eyes....

11 December 2014 8,638 1 View

Why we use the term of "optical constants" of a material in spite of their variations ? is-it by misnomer ?

Optical constants as well as the gap, represent the signing of a material. They must be specific for this material. However, optical constants depend of the size of the crystallites which form the...

11 December 2014 5,820 3 View

Can we predict barrier potential in a contact metal-semiconductor or semiconductor-semiconductor using a theoretical approach ?

From band structure obtained with an existing calculation method , can we reach the result relating to the contact barrier between two materials ?

11 December 2014 5,588 13 View

The IR radiations are harmful for the performances of photovoltaic solar cells; how is-it possible to eliminate these kind of radiations ?

Among the parameters which decrease the efficiency of the photovoltaic solar cells, we can note the solar IR radiations. This kind of radiation increases the temperature and then disturbs often...

11 December 2014 571 17 View

Is it possible to obtain a natural colored image using electron microscopy or ecography ?

Until today, a good colored image is obtained using exclusively light. Electron microscope uses electrons and echograph uses ultrason. That gives only gray images.

10 November 2014 7,863 11 View

What kind of chemical products are generally used in order to target a given thin film by the CBD technique?

We can take the case of WO3 or CdTe as example

08 September 2014 9,291 2 View

What is the best chemical solution which can be used to obtain tungsten oxide in the framework of chemical bath deposition (CBD)?

Especially to target the WO3 oxide.

02 March 2014 2,937 2 View

Which type of compound does lamda max of 218 indicate in a uv-vis spectrum of a partially purified compound through column and TLC?

A crude extract of fungal culture using EtOH was subjected to column and TLC and partially purified compound was obtained. UV vis spectrum of the compound/s has max absorbance at 218nm. The...

11 August 2024 9,801 2 View

How to develop investments in renewable energy sources?

08 August 2024 5,112 3 View

Stability of the Solar System: Insights from Einstein’s Equations ?

The stability of the Solar System is a complex subject that blends the classical framework of Newtonian mechanics with the modern insights provided by General Relativity (GR). Understanding this...

07 August 2024 2,569 1 View

U you think We need a website software of Blackbody radiation law expert software?

A website software of Blackbody radiation law expert software can used through the following web site. http://39.105.188.151:3000/index

07 August 2024 1,706 0 View

How to use Density Functional Theory to calculate carrier mobilities of solid system?

Hello, everyone. I have tried to determine carrier motilities of some materials, by Density Functional Theory, using Quantum ESPRESSO. There are a few methods to do it, like a package called...

04 August 2024 8,894 1 View

Does continues partial charging/discharging do any harm to the BESS performance and degradation?

For a grid connected BESS (lets say 100 MW/200 MWh system, LFP battery), if we charge the BESS in such a way that whenever we can access power from the solar that will charge the BESS. Hence it...

01 August 2024 9,903 7 View

Best mask design for metal deposition aiming build a Perovskite solar cell device?

What types of mask designs for metal deposition, to be used in a PVD system, are best suited for perovskite-based solar cells?

31 July 2024 4,835 3 View

Can a Conventional 50W visible LED Lamp Emit UV Light?

I'm researching light sources and their UV emissions. I'm curious if a 50W, 7500K conventional LED lamp emits any UV light. I found that a 200W tungsten lamp can emit up to 1.5 mW/cm² at 350 nm....

31 July 2024 3,843 7 View

Is artifacts in XPS possible to build high deviation in binding energy larger than 5 eV??

Hello. Thanks for your consideration to see my question. Recently, I conducted XPS anaylsis of g-CN that is prepared from thermal polycondensation of DCDA, so-called conventional bulk-g-CN,...

30 July 2024 9,824 2 View

Is there a database with onshore wind production for the wind farms in Portugal?

I am looking to predict some production for future onshore wind energy production in Portugal, is there any database with info of performances of the existing wind farms in the country? something...

28 July 2024 1,750 1 View

Chris Gueymard

This a vast question. You need to be more specific: Where? What is your application? What kind of data (hourly, daily, monthly) and for how long? What accuracy do you need? What is your budget? etc.

Kebbab Zoubir

You need some astronomy knowledge, especially how to calculate the day duration in a given locality. You must also utilized some weather model for describing your locality.

Best regards.

Hamit Can

https://link.springer.com/article/10.1007/BF02243322

Conference Paper ON THE CORRELATIONS BETWEEN DIFFUSE AND GLOBAL DAILY SOLAR RADIATION