Due to the growing demand for sustainable energy, thermoelectric (TE) technology that directly converts unserviceable waste heat into available electricity is gaining traction. [1][2][3][4] However, the widespread use of TE technology is severely hampered by its relatively low energy conversion efficiency, [5] which depends on the composed material's figure of merit zT ¼ κα 2 T/κ, where α, σ, κ, and T are the Seebeck coefficient, electrical conductivity, total thermal conductivity (including the lattice contribution κ L and the carrier contribution κ e ), and absolute temperature, respectively. [2,3,6] However, in view of the sophisticated competitive relationship between α, σ, and κ, it is currently an overwhelming challenge to achieve considerable progress in zT.Recently, the orthorhombic SnSe has received extensive attention due to its ultrahigh zT % 2.8. [7] The remarkable lattice anharmonicity evoked by the interestingly layered structure of SnSe is the main reason for its ultralow κ L and distinguished zT. [8] In consideration of the similar crystal

The layered semiconductor material molybdenum disulfide (MoS2) has led to an upsurge in research for applications in optoelectric devices that benefit from its excellent optical and electrical properties. The application of the plasmonic structure to enhance light–matter interaction and intensity of the light field via localized surface plasmon resonance provides a promising method for MoS2-based devices for improving performance. In this work, we have prepared a plasmon-enhanced few-layer MoS2 photodetector based on a gallium nitride substrate using a bowtie equal grid antenna structure, and the large-scale few-layer MoS2 growth on the GaN substrate is realized by chemical vapor deposition. The enhancement MoS2 plasmonic photodetector achieves a high responsivity R of 0.82 A/W, a low noise equivalent power NEP of 6.58 × 10–14 W/Hz1/2, and a detectivity of 1.56 × 1012 Jones under 365 nm at 5 V bias and a corresponding rise/fall time of 18/10 ms. With the enhanced performance of the photodetector demonstrated, the as-fabricated plasmonic structure proposed a feasibility method to achieve enhanced photoresponse and is applicable to other high-efficiency photoelectric devices.

Li Yugeng, China National Petroleum Corporation, SPE Member, Yu Xiaoqing, Xi'an Petroleum Institute, Wan Wanggeng, Xi'an Jiaotong University, Xu Yuangang, Xi'an Petroleum Institute, Yu Guoan, Xi'an petroleum Institute, SPE Member Abstract The structure, characteristic and primary parameters determination are briefly introduced for Numerically Controlled Pumping Unit is this paper. After data processing of diagnostic results for Numerically Controlled Pumping Unit, a diagnosis software and a software for designing the tapered rod string are developed. It is proved that these two softwares are reliable and have enough precision. Introduction Numerically Controlled Pumping Unit is completely numerically controlled and an embodiment of combining machinery with electricity, it was developed in 1992 by China National Petroleum Corporation, Baoji Oil Machinery Factory and China Northern Power Group. It has filled in the gap in oil machinery installment of China. It has the following advantages: it consumes less steel material and energy, its movement law is rational, the pumping efficiency can be raised and the pump inspection period will be lengthened. It is easy to adjust and convenient to operate. It has been tested in the oil fields of Dagang, Huabei and Daqing and has a good result. The test results from a well in Dagang Oil Field shows that the motor power factor is as high as 0.97, the motor efficiency is about 90%. power saving is 53.8%. The test results from two wells in Daqing Oil Field show that the pumping efficiency can be raised by 40%. In this paper, structure and primary parameters determination for Numerically Controlled Pumping Unit are presented. Analysis of movement law and data processing of diagnosis are presented. Fault diagnosis for Numerically Controlled Pumping wells and design of its rod string are finally presented. The structure of Numerically Controlled Pumping Unit is not very satisfactory and needs further improvement. It is necessary to develop a closed-loop control system for the Numerically Controlled Pumping Unit in case empty pumping, rod pans and motor's lacking phases take place. STRUCTURE OF NUMERICALLY CONTROLLED PUMPING UNIT AND DETERMINATION OF PRIMARY PARAMETERS Numerically Controlled Pumping Unit is drived from its top. It has two parts; one is machinery part and another is numerically controlled part. P. 197

Al and Zn powders in the ratio of 9:1 (wt. %) were alloyed into rods with a dense structure by using the continuous extrusion technique. To promote metallurgical bonding of heterogeneous elements, the microstructures of these rods with different holding times (1, 3, and 5 minutes) at the same annealing temperature were investigated. With the increase of annealing time, the microstructure consisted mainly of (α-Al) and (α+η) phases and an (α+η)-rich phase. The solid solubility of Zn into Al also gradually increased. The calculated X-ray diffraction (XRD) data showed that the lattice parameter of Al decreased to 4.04793 Å after 5 minutes of annealing, which was decreased by 0.062% compared to the lattice parameter of Al in the powder state. The microscopic stress and dislocation density of Al were increased by 0.27% and 12.52 × 1014 m-2 respectively after extrusion, and the microscopic deformation and dislocation density were decreased to 0.2% and 8.71 × 1014 m-2 respectively after being annealed for 5 minutes. The dislocation density and lattice distortion after annealing gradually decreased with increasing annealing time, and the scanning electron microscopy (SEM) results indicated that the mass percentage of Zn increased with increasing annealing time.