The experiment studies various concentration methane pool liquid' effect on off season yamazer's quality and output.The result shows that natural pond liquid of various consistency raises the production to the off season yamazer among which methane pool liquid of 50% has the best effect.The output increases by 48.1%.At the same time,using methane pool liquid creates a conditon for producing socially harmless green off season yamazer and gains the purqose of adding output and harvest.
In order to acquire reasonable blank shape of sheet metals with complex surface, surface flattening method based on triangle and energy model is put forward. According to equal surface principle, the surface is divided into many triangles, which are flattened one after another. Meanwhile, the surface is regarded as energy model, which is used to alter original flattened discrete points. Finally, surface approximate flattening is completed with second development technology based on Pro/ENGINEER platform. In sheet metal manufacturing process, reasonable blank shape is generated quickly.
Microchannel Plate (MCP) with ion barrier films (IBFs) is one of the key components in Low Light Level (LLL) Image Intensifier (I2) tubes in Generation III. Vacuum high-temperature baking process plays a destructive role in the particle blocking and transmitting performance of ion barrier film. Al2O3 thin film density as a function of the temperature of the environment was studied using molecular dynamics simulation. Electron transmittance and ion barrier blocking ratio of Al2O3 thin film versus the energy of incident particles were simulated and calculated using the Monte Carlo method. The dead voltage of Al2O3 thin films was about 235 V, and with the decrease of the incident ion energy, ion blocking ratio increased. When the incident energy was 250 eV, the preventing ability of Al2O3 films on C, N, O ions was 96%-99%. Based on the above factors analysis, with the increase of the external temperature, electron transmittance increased linearly, while the blocking ratio of ion barrier decreased nonlinearly. Optimization and adjustment of high temperature baking time and quantity will contribute to the ion barrier film performance improvement.
We analyze the left-right asymmetry in the semi-inclusive deep inelastic scattering (SIDIS) process using a method where no weighting function are used. Considering all flavor of quarks, we reanalyze the π± production and extend our calculation on the K± production. The predictions on HERMES, COMPASS and JLab kinematics with transversely polarized nucleon target are shown in this paper.
In order to improve the design and unfolding efficiency of complex sheet metal parts, the sheet metal parts library is constructed based on Pro/ENGINEER platform with VC++ and Pro/TOOLKIT, the second development technology of Pro/ENGINEER including parameter driving, modeling methods and unfolding method for sheet metal parts are also introduced in detail. Finally, sheet metal parts parametric design and unfolding are achieved.
Abstract Semitransparent organic solar cells (ST‐OSCs) have huge potential in terms of building integrated photovoltaics (BIPVs). However, the inherent contradiction between active layer absorption and average visible‐light transmittance (AVT) hinders the follow‐up development of ST‐OSC. To solve this problem, hydrogen bond strategy has been adopted to simultaneously improve the photon trapping capability and film thickness tolerance of the devices. Here, an organic small molecule material DIBC is introduced into PM6:Y6 system to form an intramolecular hydrogen bond with Y6, through which a high power conversion efficiency (PCE) of 17.20% is obtained. It is noted that when the active layer thickness is varied from 70 to 150 nm, the PCE values distributed in the range of 16.39–17.20%, which exhibits excellent film thickness tolerance. Moreover, ST‐OSCs are achieved with a maximum PCE of 14% and a high AVT of 21.60%, which is among the best reported results of ST‐OSCs. In addition, hydrogen‐bond‐based ST‐OSCs show superior thermal and light stability in the atmospheric environment corresponding to the control devices. This work provides a feasible solution for ST‐OSC with outstanding efficiency and high AVT, which is of great significance for the industrial production of BIPVs in the future.
Abstract The helical-labyrinth seal (HLS) can reduce rub between labyrinth teeth and rotor during the rotor vibration because the helical teeth on the stator and steps (or teeth) on the rotor are staggered in some positions. The helical-labyrinth seal with the bristle pack named as the helical-labyrinth-brush seal (HLBS) has excellent sealing performance, but the study on the leakage flow characteristics of the HLBS is not available. This paper, using computational fluid dynamic (CFD) analysis technology based on a porous medium model, investigates the leakage flow characteristics of two types of HLBSs (bristle pack installed upstream or downstream of helical-labyrinth tooth named as HLBS-U and HLBS-D, respectively) at various pressure ratios (1–1.3) and rotational speeds (0–10,000 r/min, surface speeds range from 0 to 209 m/s). The radial clearance cb between the rotor and the bristle pack ranges from 0 mm to 1.0 mm, and the radial clearance ct between the labyrinth teeth and the steps on the rotor is 1.6 mm. In parallel, the leakage flow characteristics of the HLBS-D with the constant cb of 1.0 mm are experimentally measured at the pressure ratio up to 1.3 and rotational speed up to 2000 r/min (surface speed 42 m/s). The CFD-derived leakage flow rate (represented as effective clearance) and static cavity pressure agree well with the experimental data in the whole range of test conditions. The shaft rotation eliminates the leakage hysteresis effect of the HLBS-D. Compared with the HLBS-D, the effective clearance of HLBS-U is less sensitive to rotational speed changes. The effective clearance of the HLBS-U is smaller than that of the HLBS-D in the case of cb = 0.5 mm and rotational speed n < 10,000 r/min, and the case of cb = 1.0 mm. However, for the case of cb = 0.5 mm and n = 10,000 r/min, and the case of cb ≤ 0.1 mm, the situation is opposite. The brush seal sections of the HLBS-U and the HLBS-D offer over 55% and 65% total static pressure drop in the case of cb = 1.0 mm, respectively. The brush seal sections of two HLBSs bear almost the same static pressure drop of the over 97% total static pressure drop as cb equals to 0.1 mm. What is more, the HLBS-U has lower turbulent kinetic energy upstream of the bristle pack than the HLBS-D does, which means that the intensity of the bristles flutter of the HLBS-U is lower.
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