Electrical Transmission Characteristics Research Articles

The effect of SPS sintering temperatures on the structure, thermoelectric properties, and scattering mechanism of Cu2Se

Cu2Se has recently received much attention due to its excellent thermal and electrical transmission characteristics. In this study, Cu2Se compounds were synthesized by vacuum melt-annealing method and sintered by discharge plasma sintering (SPS) in the 793–1093 K temperature range. The effects of SPS temperatures of 793, 893, 993, and 1093 K on the phase composition, microstructure, band structure, and thermoelectric properties of Cu2Se samples, as well as the test stability of Cu2Se at high temperatures were studied. The results show that the sintering temperature affects the thermoelectric properties, microstructure, and energy band structure of Cu2Se compounds. The samples show many component segregations with nano-micron size and irregular morphology. According to conductance ratio analysis, the primary mechanism of carrier scattering is ionized impurity scattering, consistent with the change of carrier mobility with the test temperature. Combined with the XPS analysis results and defect balance equation, the mechanism of the test temperature depends on carrier concentration, and the carrier scattering mechanism is reasonably explain. The lattice thermal conductivity of Cu2Se materials is relatively low at all sintering temperatures due to nano-micron segregation and the presence of high-mobility Cu ions. Especially at the sintering temperature of 893 K, the segregation of nano-micron components is the most uniform, and the segregation particle size is the smallest, effectively enhancing the phonon scattering and making the lattice thermal conductivity the lowest. At 873 K, the ZT of Cu2Se sintered at 893 K reaches a maximum value of 1.34.

Study on the Electronic Structure and Electrical Transmission Characteristics of Low-dimensional h-BCN Nanomaterials

Study on the Electronic Structure and Electrical Transmission Characteristics of Low-dimensional h-BCN Nanomaterials

Coupling of Pyro-Piezo-Phototronic Effects in a GaN Nanowire.

In this paper, we systematically investigate the synergistic regulation of ultraviolet and mechanical loading on the electromechanical behavior of a GaN nanowire. The distributions of polarization charge, potential, carriers, and electric field in the GaN nanowire are analytically represented by using a one-dimensional model that combines pyro-phototronic and piezo-phototronic properties, and then, the electrical transmission characteristics are analyzed. The results suggest that, due to the pyro-phototronic effect and ultraviolet photoexcited non-equilibrium carriers, the electrical behavior of a nano-Schottky junction can be modulate by ultraviolet light. This provides a new method for the function improvement and performance regulation of intelligent optoelectronic nano-Schottky devices.

Photoexcitation dominated electrical behaviors in a nano GaN PN junction

In this paper, we investigate the regulation behaviors of photoexcited nonequilibrium carriers in a GaN piezoelectric semiconductor PN junctions. It is shown that the electromechanical field of the PN junction has a fast response to the illumination intensity. This is attributed to the ultraviolet photoexcited non-equilibrium carriers, which can shield the piezoelectric charges and significantly weaken the built-in barrier height. Furthermore, the electrical transmission characteristics are also regulated. It implies that the electrical behaviors of a nano GaN PN junctions are highly sensitive to ultraviolet light, and such a contactless approach can be applied to control the nano GaN devices.

INVESTIGATION OF THE INFLUENCE OF TWISTING METHODS MULTI-PAIR LAN CABLES ON THEIR ELECTRICAL TRANSMISSION CHARACTERISTICS

The need to study the infuence of twisting methods of cable core of multi-pair LAN cables on their main electrical transmission characteristics is justifed. Experimental studies of the electrical transmission characteristics of multi-pair LAN cables of category 5e in the frequency range up to 100 MHz have been conducted. The results of experimental studies of low-frequency and high-frequency electrical transmission characteristics of these LAN cables are presented. A detailed analysis of the results of experimental studies is carried out. It has been found that high-frequency transmission characteristics such as wave resistance and return losses are most afected by cable core twisting methods. Frequency behavior of these transmission characteristics is analyzed. It was shown that high geometric and structural uniformity of isolated cores, as well as the use of modern high-speed specialized equipment for twisting the pairs provide high transmission parameters of a four-pair LAN cable of category 5e. It was found that SZ twisting technology is unacceptable due to the introduction of geometric inhomogeneities in the manufacture of multi-pair cables. It is recommended to use unidirectional twisting bow-type stranders to minimize geometric inhomogeneities.

Investigation of static and dynamic electronic transport characteristics of zigzag arsenene nanoribbons: An ab-initio study

Electrical transmission characteristics of zigzag arsenene nanoribbons having various widths are investigated in this paper. Both static current-voltage characteristics and dynamic kinetic inductance, quantum capacitance and cut-off frequency parameters are obtained via ab initio computations for zigzag arsenene nanoribbons having eight different widths. The results expose that while negative differential resistance characteristics are common to all of the studied nanoribbons while current-voltage variations, negative differential voltage ranges and negative differential resistance values of these nanoribbons strongly depend on the width. The differences among these different current-voltage characteristics are explained using transmission spectra and transmission eigenstates. Moreover, kinetic inductance, quantum capacitance and cut-off frequency values of these zigzag arsenene nanoribbons are also computed which also shows a strong width dependency from a dynamic behaviour viewpoint. The study concludes with possible practical applications of these findings.

Research on a simulating device for electric transmission characteristics of long-distance subsea umbilical cable

Subsea umbilical cable is an important link to transmit power and signals in subsea production system, often lasts for tens of kilometers in deep-sea projects. It is expensive, bulky, and inconvenient to transport. In this article, a compact, low-cost umbilical cable electrical simulator is proposed, which can be equivalent to the real umbilical cable in power transmission characteristics and can adjust parameters in a certain range. By studying the electrical transmission characteristics of long umbilical cable, the calculation method of electrical transmission characteristics is determined. A simulation device for simulating the transmission characteristics of umbilical cable is designed, which can be used to simulate the umbilical cable diameter of 10 and 16 mm2. The voltage drop characteristics, signal transmission attenuation characteristics, and power carrier characteristics of the umbilical cable electrical simulation device are simulated and experimentally analyzed. The experimental results show that the voltage drop characteristics, signal transmission attenuation characteristics, and power carrier characteristics of the umbilical cable electrical simulator are in good agreement with the real umbilical cable. The simulation device of umbilical cable can well simulate the power and signal transmission characteristics of real umbilical cable.

Recent progress in memristors for stimulating synaptic plasticity

With the rapid expansion of data information, modern computers based on the von Neumann architecture are facing severe challenges. Intelligent computers that can learn, store, and process information flexibly like a human brain will be the direction and goal of computers development. Brain controls almost all the complex life activities of human beings, and information transmission between cerebral neurons relies on the structure called “synapse, whose outstanding property — synaptic plasticity— is thought to be an important molecular basis of learning and memory. Therefore, it is widely believed that emulation of synapse and synaptic plasticity is the first step to realize effective artificial neural networks. Owing to the birth and development of the fourth fundamental passive circuit elements, memristors, which have unique nonlinear synaptic electrical transmission characteristics, it is possible to achieve this goal. Thus, over the past few years, a great deal of efforts have been made in mimicking synapse functions though memristors. In this review, recent simulations of synaptic plasticity using different memristor devices and various methods are comprehensively summarized, including short-term plasticity (paired-pulse depression, paired-pulse facilitation, and post-tetanic potentiation), long-term plasticity, spiking-rate-dependent plasticity, spiking-timing-dependent plasticity, learning experience, associative memory, and synaptic scaling. Finally, the current problems faced in the research and the development prospects in this area are briefly discussed.

Electrical Transmission Characteristics of Marine Seismic Cable

The transmission line response of a marine seismic survey cable is analyzed. A new amplifier design yields significant improvement in compensating for the undesirable effects of the transmission line.

XIV. Electrical Tests Over a Range of Frequencies

PARTLY at the request of the Navy Department, during 1942 the Bell Telephone Laboratories became actively involved in a program of measurement of electric-transmission characteristics of radio-frequency cables. There was greatest interest in improvement of the precision of attenuation measurements. At that time, the state of the art was such that spot measurements had been made at various isolated frequencies, but little if any wide-range data had been obtained on any one cable sample. Since the resistance of a cable braid and the power factor of the dielectric were almost always in doubt, we had no adequate check of the precision of specific measurements on a specific set.