Phonon Drag Thermopower in Silicene in Equipartition Regime at Room Temperature

Similar to graphene, zero band gap limits the application of Silicene in nanoelectronics despite of its high carrier mobility. In this article we calculate the contribution of electron-phonon interaction to thermoelectric effects in silicene. One considers the case of free standing silicene taking into account interaction with intrinsic acoustic phonons. The temperature considered here is at room temperature. We noticed that the contribution to thermoelectromotive force due to electron drag by phonons is determined by the Fermi energy. The explicit temperature dependence of the contribution to thermoelectromotive force deriving from by phonons is weak in contrast to that due to diffusion, which is directly proportional to temperature. Thus a theoretical limit has been established for a possible increase of the thermoelectromotive force through electron drag by the intrinsic phonons of silicene. Keywords: Phonon-drag thermopower, electron-diffusion thermopower, silicene, fermi energy, zero band gap

Electorchemical reasons corrosion of shield skins

Напряжения, возникающие в термопарах, образованных в сварных узлах стальных обшивок, оказываются сопоставимыми с напряжениями самых чувствительных термопар. Это определяет высокий уровень склонности стальных сварных соединений к электрохимической коррозии и объясняет повышенный интерес, проявляемый судостроителями к проблеме её элиминирования. Влияние на термоэлектродвижущую силу кремния носят резкий зигзагообразный характер. Усредненный собственный потенциал от перепада температур в стальной заготовке изменяется по синусоидальному закону. Найдено, что наибольшее значение электрического потенциала исследованных сталей характерно при содержании кремния ниже 0,2%. Температура окружающей среды оказывает значительное влияние на потенциал, что важно при значительном колебании температуры воды и воздуха. Возникла необходимость научного анализа и интерпретации накопившихся сведений. В работе представлен один из вариантов возможного теоретического объяснения наблюдаемых явлений. The stresses arising in the thermocouples formed in the welded joints of the steel cladding are comparable to the stresses of the most sensitive thermocouples. This determines the high level of susceptibility of steel welded joints to electrochemical corrosion and explains the increased interest shown by shipbuilders to the problem of its elimination. The effect on the thermoelectromotive force of silicon is of a sharp zigzag character. The average self-potential from the temperature difference in the steel billet changes according to a sinusoidal law. It was found that the highest value of the electric potential of the investigated steels is characteristic when the silicon content is below 0.2%. The ambient temperature has a significant effect on the potential, which is important with significant fluctuations in the temperature of water and air. There was a need for scientific analysis and interpretation of the accumulated information. The paper presents one of the options for a possible theoretical explanation of the observed phenomena.

Термоэлектрические и термоэлектрокинетические явления в коллоидных системах, модельных биологическим жидкостям живых организмов

The paper presents the results of experimental measurements of thermoelectromotive force, thermoelectrokinetic EMF and conductivity coefficient in aqueous solutions, model in their properties and composition of human blood: medical ringer solution, serum albumin, ringer solution containing serum albumin. The influence of organic colloidal particles present in aqueous solutions of inorganic electrolytes on the value of their coefficient of thermoelectromotive force is analyzed. As follows from the results of the experiments, the coefficient of thermoelectromotive force of the studied liquids, based on the ringer solution, has a sharp dependence on temperature and acquires a large value in the temperature range in which the living human body functions. The obtained result indicates that the studied phenomena can play an important role in triggering the mechanisms of thermoregulation of living organisms.

Structuring Control of Facial Layer during Edge Cutting Machining

The article considers efficiency increase of formation of surface performance characteristics of machine components. The possibility of structuring control of facial layer on the basis of measuring of thermoelectromotive force (thermo-emf), cutting force component and also vibroacoustic signal has been scrutinized.

Non-Stationary Temperature Distribution and Thermoelectromotive Force for Optical Thermoelement at Anti-Parallel Directions of Temperature Gradient and Ray Current

The possibilities of utilization of anisotropic optical thermoelements (AOT) with different magnitudes of optical transparency for the registration and transformation of high-intensive ray currents are observed. The solution of non-stationary unhomogeneous equation of thermoconductivity is presented taking into account the Bouguer Lambert law at anti-parallel directions of ray current and temperature gradient for the anisotropic plate ZnAs2. It is shown that the non-stationary temperature distribution is determined by anisotropy of thermoconductivity and optical properties of thermoelement material and is characterized by complicated non-linear dependence both of coordinates and time. The expressions for the thermoelectromotive force are obtained for the case of optical transmitting and surface absorption. The dependences of transversal thermoelectromotive force on the time and height of thermoelement are investigated.