Research on phase shift characteristics of electromagnetic wave in plasma

The phase shift characteristics reflect the state change of electromagnetic wave in plasma sheath and can be used to reveal deeply the action mechanism between electromagnetic wave and plasma sheath. In this paper, the phase shift characteristics of electromagnetic wave propagation in plasma were investigated. Firstly, the impact factors of phase shift including electron density,collision frequency and incident frequency were discussed. Then, the plasma with different electron density distribution profiles were employed to investigate the influence on the phase shift characteristics. In a real case, the plasma sheath around the hypersonic vehicle will affect and even break down the communication. Based on the hypersonic vehicle model, we studied the electromagnetic wave phase shift under different flight altitude, speed, and attack angle. The results indicate that the phase shift is inversely proportional to the flight altitude and positively proportional to the flight speed and attack angle. Our work provides a theoretical guidance for the further research of phase shift characteristics and parameters inversion in plasma.     

TP130TT高抗挤套管研究与应用

为了提高盐层段固井质量 ,中原油田研究开发了 TP130 TT高抗挤套管 ,性能试验评价表明 ,其抗挤强度超过 16 0 MPa,并给出了其固井质量评价标准。在中原油 346口井中的应用表明 ,该套管有效地解决了盐层段套管损坏问题 ,延长了油气水井寿命 ,经济效益和社会效益显著。     

特征提取在硅内部微/纳米级体缺陷检测中的应用

提出了一种利用特征提取来对硅中微/纳米级体缺陷的激光散射图样进行分析,以获得缺陷大小信息的分析方法.给出了该方法中第一特征值和第二特征值的定义,指出通过所提出的第一特征值及第二特征值即可迅速地判断出缺陷的大小量级所在.这种分析方法具有分析速度快,在体缺陷小于1μm时分辨率高,且可使系统实现自动化等优点.     

S28-248型偏心BDC钻头的研制与应用

为了提高中原油田沙3中至沙4段四开小井眼的钻井速度,有效地解决易卡钻、钻速低、成本高以及小间隙井眼固井质量差等问题,中原油田与川石·克里斯坦森金刚石钻头有限公司合作,研制开发了用于深部小井眼钻井的149.2mm的S28-248型偏心BDC钻头。详细介绍了该钻头的设计特点及现场应用情况。     

Paving the Way for High-Performance UVB-LEDs Through Substrate-Dominated Strain-Modulation

AlGaN-based ultraviolet-B light-emitting diodes (UVB-LEDs) exhibit great potential in phototherapy, vitamin D3 synthesis promotion, plant growth regulation, and so on. However, subjected to the excess compressive strain induced by the large lattice mismatch between multiple quantum wells (MQWs) and AlN, UVB-LEDs that simultaneously satisfy the requirements of high light output power (LOP), low working voltage, and excellent stability are rarely reported. Here, a substrate-dominated strain-modulation strategy is proposed. By precisely manipulating the strain in AlN grown on nano-patterned sapphire substrate (NPSS) to a slightly tensile one, the compressive strain in the following Al_0.55Ga_0.45N underlayer and Al_0.28Ga_0.72N/Al_0.45Ga_0.55N MQWs is successfully suppressed. As a result, an outstanding UVB-LED with a peak wavelength at 303.6 nm is achieved. The 20 × 20 mil² UVB-LED chip shows a wall-plug efficiency (WPE) of 3.27% under a forward current of 20 mA and a high LOP of 57.2 mW with an extremely low voltage of 5.87 V under a forward current of 800 mA. It is more exciting that the LOP degradation is as low as 17% after 1000 h operation under a forward current density of 75 A cm⁻², showing excellent stability. The here-developed UVB-LED, with a high LOP and excellent reliability, will definitely promote the applications of AlGaN-based UVB-LEDs.     

算法引擎与嵌入式策略组态软件设计

随着嵌入式系统和分布式控制系统的发展,策略组态软件也逐渐应用于嵌入式系统。使用算法策略组态软件,不仅可以减小系统开发时的软件工作量和开发难度,还可以提高系统的运行可靠性。基于算法引擎,提出了一种嵌入式策略组态软件设计方法;通过局域网内服务器和客户机的方式,控制策略组态软件在嵌入式系统中运行、在线监控和重新配置。实际应用表明,该方法实现了策略组态软件和嵌入式系统的结合,证明了该方法的可行性。     

压电驱动微喷雾化器的研制及实验研究

作为一种重要的非注射给药途径，雾化吸入治疗方法具有起效快，药物毒、副作用小等特点，因此被越来越广泛地采用。基于压电驱动喷雾打印机工作基本原理，利用微机加工技术，研制了一种压电驱动微喷雾化器。流量、雾粒的直径和速度是微喷雾化器的重要指标，文中采用相关的仪器分别对这些指标进行了测试。由测试结果可知，微喷雾化器产生的雾粒的直径和速度分布集中，且雾粒直径和速度比较适合于雾化吸入治疗，可能成为一种重要的雾化吸入治疗装置。     

云南某铅锌矿浮选工艺研究

针对云南某铅锌矿主要有用矿物为方铅矿和铁闪锌矿,并含少量黄铁矿的矿石性质,采用抑锌浮铅的优先浮选工艺流程,以硫酸锌及亚硫酸钠为锌矿物的组合抑制剂,在原矿铅品位2.39%,锌品位3.35%时,经闭路试验获得铅精矿Pb品位67.46%,回收率83.08%;锌精矿Zn品位47.78%,回收率79.54%的指标.     

湖南省峰谷分时电价分析及优化策略研究

针对湖南省电网执行峰谷分时电价存在的问题,结合湖南省实际情况,提出完善峰谷分时电价的策略.以规划综合大数据平台为基础,基于负荷需求弹性分析,综合考虑供电成本、用户用电成本、负荷优化目标等条件,通过研究电价价差调整原则,制定出不同时段的电价,根据电价的经济信号,引导各类用户合理用电,优化负荷特性,提升湖南电力系统运行效率...     

紧固件用SA-540合金钢的强韧化工艺研究

通过成分优化(/%:0.35～0.46C,0.6～1.0Cr, 1.50～2.05Ni, 0.18～0.32Mo, 0.1V)、冶炼工艺(3 t VIM+ESR)以及热处理工艺(再次热处理工艺：850℃2 h水冷+590℃5 h水冷)的合理制定,获得了满足指标要求的紧固件用高强高韧SA-540合金钢材料。结果表明,为确保SA-540合金钢高温300℃规定塑性延伸强度R_p0.2≥860 MPa,室温抗拉强度应控制在1150～1170 MPa,仅有20 MPa的强度范围。对于经850℃2 h淬火/水冷+560℃5 h回火/水冷调质处理后室温抗拉强度超标的紧固件,可再次通过重新淬火并提高回火热处理温度(850℃2 h淬火/水冷+590℃5 h回火/水冷)使合金钢拉伸性能满足指标要求。SA-540合金钢淬火后随回火的温度升高,呈现抗拉强度和屈服强度下降、伸长率和断面收缩率增加的变化趋势。添加0.1%V的SA-540合金钢,可明显提高合金钢的强度和塑性指标,但低温冲击性能降低明显。