TEMPERATURE DEPENDENCE OF HEAT CAPACITY OF ALUMINIUM, COPPER, SILICON, MAGNESIUM AND ZINC AND COMPARISON WITH DEBYE THEORY

The results of comparison of heat capacity of aluminum, copper, silicon, magnesium and zinc with Debye's theory depending on temperature are given in the paper. It was revealed that the main components of the heat capacity of metals are the lattice component; is a component due to thermal expansion and is an electronic contribution. It is proposed that when creating the theory of heat capacity, it is necessary to take into account the anharmonicity of the oscillations of atoms in the nodes of the crystal lattice and the change in Debye temperature.

Data Protection Laws & Ways to conformity

This Research – Data Protection Laws and Ways to Conformity – talked about the data protection laws in Arabic countries and take the general data protection regulation as research main example. The main purpose of that is to show which point has developed the GDPR and to make a comparison with the legal situation in Arabic countries, the UAE was used as the main example of the Arabic countries in this research due to the advanced development level in technical and legal fields.This research uses mainly the books, electronic contribution and online guides as references and use the comparison as main research method. The new points in the European laws and the expanding of GDPR application to every country in specific cases related to the main discussion points in this research. The research comes to the results with recommendations about the best ways to be conform with the protection laws and the features behind this conformity.

Role of Anharmonicity in Specific Heat of Metals and Insulators at Low Temperatures

In this paper we discuss the role of anharmonicity of lattice waves in electronic specific heat of metals and insulators at very low temperatures. Previous researchers have revealed the anharmonicity of the lattice waves to cause deviation in specific heat from Debye T3 law. Different researchers have given different concepts of anharmonicity in electronic specific heat of metals at very low temperatures. The energy spectrum of phonons can not be fully described by the Debye law. On the whole all reports dilute the contention of the electronic contribution to be responsible for linear temperature dependent component of specific heat of metals at very low temperatures. For anharmonicity of lattice waves this contribution must be expected for metals and insulators also.

Elaboration of low-band-gap π-conjugated systems based on thieno[3,4-b]pyrazines

In order to understand the electronic contribution of the thienopyrazine building block on the electronic properties of π-conjugated systems, small molecules containing thiophene and thienopyrazine moieties are synthesized and jointly studied by theoretical (DFT) and experimental methods (UV-Vis, UPS). Taking advantages of these preliminar attractive results, four low band gap extended structures have been elaborated on the base of Donor-Acceptor-Donor sequences (DAD); these elongated π-conjugated molecules exhibit noticeable electronic and absorption properties spreading from the near UV to NIR regions.

Phenomenology of the Temperature-Frequency Dispersion of Electrical Properties of Aluminium-Substituted Lithium-Iron Spinel

The conductivity of the Li-containing Al-oxoferrite samples has been studied. Using Jonsher’s phenomenological approach, existence of 2 types of conductivity (electronic and ionic) in the above mentioned samples has been confirmed. Using Cole-Cole method, the character of electrical conductivity dispersion of the samples has been shown. The activation energy for the series of samples have been calculated. It has been found that the ionic contribution to the total conductivity of the system is much lower that the corresponding electronic contribution.