Inelastic Behaviour of Hollow Rectangular Shaped Aluminium Beams

Thermoelectric properties of B12N12 molecule

Current Nanoscience ◽

10.2174/1573413716666191230155900 ◽

2019 ◽

Vol 16 ◽

Author(s):

Mohammad Reza Niazian ◽

Laleh Farhang Matin ◽

Mojtaba Yaghobi ◽

Amir Ali Masoudi

Keyword(s):

Molecular Electronics ◽

Thermoelectric Properties ◽

Electronic Devices ◽

Thermal Conductance ◽

Wide Band ◽

Oscillatory Behavior ◽

Mapping Technique ◽

Junction Points ◽

Inelastic Behaviour ◽

New Generation

Background: Recently, molecular electronics have attracted the attention of many researchers, both theoretically and applied electronics.Nanostructures have significant thermal properties, which is why they are considered as good options for designing a new generation of integrated electronic devices. Objective: In this paper, the focus is on the thermoelectric properties of the molecular junction points with the electrodes. Also, the influence of the number of atom contacts was investigated on the thermoelectric properties of molecule located between two electrodes metallic.Therefore, the thermoelectric characteristics of the B12 N12 molecule are investigated. Methods: For this purpose, the Green’s function theory as well as mapping technique approach with the wide-band approximation and also the inelastic behaviour is considered for the electron-phonon interactions. Results & Conclusion: Results & Conclusion:It is observed that the largest values of the total part of conductance as well as its elastic (G(e,n)max) depends on the number of atom contacts and are arranged as: G(e,1)max>G(e,4)max>G(e,6)max. Furthermore, the largest values of the electronic thermal conductance, i.e. Kpmax is seen to be in the order of K(p,4)max < K(p,1)max < K(p,6)max that the number of main peaks increases in four-atom contacts at (E<Ef). Furthermore, it is represented that the thermal conductance shows an oscillatory behavior which is significantly affected by the number of atom contacts.

Download Full-text

A macroscopic theory of microcrack growth in brittle materials

Philosophical Transactions of the Royal Society of London Series A Physical and Engineering Sciences ◽

10.1098/rsta.1991.0057 ◽

1991 ◽

Vol 335 (1639) ◽

pp. 455-485 ◽

Cited By ~ 9

Keyword(s):

Crack Growth ◽

Brittle Materials ◽

Macroscopic Theory ◽

Rate Of Increase ◽

Inelastic Behaviour ◽

Constitutive Response ◽

Macroscopic Plasticity ◽

Microcrack Growth ◽

Vector Valued

This paper is concerned with the development of a macroscopic theory of crack growth in fairly brittle materials. Average characteristics of the cracks are described in terms of an additional vector-valued variable in the macroscopic theory, which is determined by an additional momentum-like balance law associated with the rate of increase of the area of the cracks and includes the effects of forces maintaining the crack growth and the inertia of microscopic particles surrounding the cracks. The basic developments represent an idealized characterization of inelastic behaviour in the presence of crack growth, which accounts for energy dissipation without explicit use of macroscopic plasticity effects. A physically plausible constraint on the rate of crack growth is adopted to simplify the theory. To ensure that the results of the theory are physically reasonable, the constitutive response of the dependent variables are significantly restricted by consideration both of the energetic effects and of the microscopic processes that give rise to crack growth. These constitutive developments are in conformity with many of the standard results and observations reported in the literature on fracture mechanics. The predictive nature of the theory is illustrated with reference to two simple examples concerning uniform extensive and compressive straining.

Download Full-text