Influence Of Temperature Dependence Research Articles

Influence of temperature dependence and Li substitution on the electronic structure of delafossite CuFeO2 and CuFeS2 semiconductors

The electronic structure properties of the delafossite CuFeO2 and Chalcopyrite CuFeS2 semiconductors were studied by XAFS technique theoretically. Calculations were performed with the XAFS code FEFF 8.20 under increasing temperature conditions for 300 K, 350 K, 450 K, 500 K, and for 20% Li substitution at room temperature. High stability in the electronic structure of both materials addressed was observed as a result of the hybridized states built with the contribution of the overlapped outer shell electrons and levels of the neighboring atoms, i.e., Cu, Fe, O or S. The hybridized levels were determined as supporting the stability of the molecular bands via rich quantum symmetries. For the second step of the studies, 20% Li substitution in copper coordination was processed to probe the response of the materials to substitution mechanisms. In the CuFeO2 semiconductors, 0.5 eV shift was observed with the Li substitution at the Fe K-edge absorption spectra which caused a loose in the Li-O bonds as a result of the weaker electronegativity which increased the strength of the Fe-O bonds.

Influence of temperature dependence on the structural characteristics of polyoxymethylene/poly(lactic acid) blends by injection molding

Abstract In this research, different strategies to modify the structure of polymer blends were investigated with the objective of adjusting the composition of polyoxymethylene (POM) and poly(lactic acid) (PLA) under typical processing conditions. POM shows a good balance of mechanical and thermal properties. However, this polymer is obtained from petrochemical sources, and in some markets, environmentally friendly materials are important. Blending POM with PLA preserves the advantages of POM while ensuring the bio-based content of PLA. POM/PLA blends were prepared by an injection molding process with various injection speeds of 10, 50, 100, and 1000 mm/s to ensure high ductility. Mechanical property analysis showed that the PLA content and processing temperatures are highly effective in modifying the stiffness of POM/PLA blends. The effect of crystallization on POM/PLA blends was assessed by varying the annealing time. High-magnification scanning electron microscopy images revealed that the gaps between fibrillar regions represent the growth direction of the PLA phase before it was removed. This was evidence for the effect of PLA on the crystallization of POM. The crystal size and crystalline volume also affected the structural characteristics of POM/PLA blends.

A Theoretical Study on the Thermoelectric Properties of Porous Armchair Germanene Nanoribbons

Since the limits of conventional sources of energy are rapidly approaching, the thermoelectric devices have attracted attention for their potential of power generation directly from waste heat. In this paper, thermoelectric properties of porous armchair Germanene nanoribbons (AGeNRs) have been explored for a range of pore dimensions in order to achieve a high performance two-dimensional nanoscale thermoelectric device. The work has been done to investigate the influence of different nanopore shapes and their associated positions on the thermoelectric performance so as to tune it to the optimum pore shape and position that would enhance the overall thermoelectric efficiency. Also, the effect of passivation of the pore edges on thermoelectric parameters for all shapes has been studied. Further, the influence of temperature dependence on figure of merit has been observed. Ballistic transport regime and semi-empirical method using Huckel basis set is used to obtain the electrical properties while the Brenner potential is used for the phononic properties.

Integral Equation for the Radial Stresses in a Radially Inhomogeneous Heat-Sensitive Hollow Sphere

We determine the thermal stressed state of a heat-sensitive radially inhomogeneous hollow sphere for given constant loads acting on its surfaces and a known temperature field inside the sphere. The corresponding problem of thermoelasticity in stresses is reduced to the solution of the Fredholm integral equation of the second kind for the radial component of the stress tensor. The influence of temperature dependences of the characteristics of radially inhomogeneous material on the stresses and displacements is investigated.

English

2 ABSTRACT: Temperature is an essential and fluctuating environmental factor influencing all life activities which dominate remarkable changes on hematological parameters of aquatic animals.The present investigation deals with temperature dependent influence on Haematology of freshwater cultivable fish Oreochromis mossambicus. The fishes were exposed to different temperatures such as 20°C, 25°C, 30°C 35°C and 40°C for 96 hr exposure. The result reveals that the RBC and WBC count were steadily decreased at higher temperature as compared to control.

The influence of temperature dependence of viscosity on stability liquid flows in a plane channel

The influence problem of temperature dependence of viscosity on stability of liquid flow in a plane channel under non-uniform temperature field was considered. The system of two ordinary differential equations for the perturbation amplitudes of velocity and temperature was received. In the case of isothermal flow, derived system can be reduced to the Orr-Sommerfeld equation. The spectra of eigenvalues for Poiseuille flow with different temperature dependence of viscosity were numerical studied. It is shown that temperature dependence of viscosity has an influence on the stability of the liquid flow.

413 熱応力によるき裂の初生 : 植物性値の温度依存性の影響(GS 材料力学III)

413 熱応力によるき裂の初生 : 植物性値の温度依存性の影響(GS 材料力学III)

回折格子表面からの熱放射スペクトルへの複素屈折率温度依存性の影響(熱工学I-2)

回折格子表面からの熱放射スペクトルへの複素屈折率温度依存性の影響(熱工学I-2)

Optical bistability and instability in a semiconductor in the case where the relaxation time of free charge carriers and their equilibrium concentration are temperature-dependent

The influence of temperature dependences of the relaxation time of free carriers and their equilibrium concentration on the feasibility of the bistability and instability of steady states is considered. A model describing the process of interaction of optical radiation with a semiconductor was used in the consideration, with various assumptions concerning the conditions of this interaction made.

Temperature Dependence of Field Hysteresis Loop in Nemato-Cholesteric Mixtures

Abstract Temperature dependence of the field hysteresis loop (δU) of the cholesterol-nematic phase transitions in mixtures based on strong and weak polar nematics. The ephires of the cholesterol (0.2… 1.6 weight %) were used as optically active dopants. For mixtures, in which fluctuation embryos have a major role at low temperatures, anomalous growth of δU is observed. The influence of temperature dependence of constants of elasticity and step of induced spiral on analogical dependence δU =f(T) takes place. Magnitude of δU can be changed by changing the percentage of cholesterine in the mixture.