一种树脂覆膜砂支撑剂的研究及现场应用

讨论了制备用作压裂支撑刺的树脂覆膜砂使用的树脂和固化剂的选择、包胶设备及工艺。选用软化点〉80℃、富含酸基并中和成盐、在水中易乳化的改性双酚A环氧树脂和中温固化的潜伏型固化刺，制备了树脂覆膜石英砂。该覆膜砂的导流能力在闭合压力〉15MPa时明显高于原始石英砂。〉40MPa时与52MPa陶粒相当或略好；该覆膜砂的52MPa和70MPa破碎率远小于石英砂，仅为3．01％和7．00％，浊度、圆度、球度、酸溶度均好于石英砂。井深3750m、油层温度130℃、原始压力系数高达1．8的某油井，1987年用普通陶粒压裂后投产，返吐砂量0．544m^3；1988年用普通陶粒压裂酸化后，砂面高于人工井底45．35m；2003年压裂中使用该覆膜砂38m^3，压裂后未返吐砂。产油量增加，有效期已超过6个月。图2表2参5。     

远程控制在红外椭偏光谱实验上的应用

基于TCP/IP数据传输协议,实现对红外双傅立叶椭偏仪的远程控制.实验系统主要分为远地用户系统与本地实验服务器系统,远地实验用户经过身份认证后,取得与实验服务器的通信联系.在本地实验者的协助下按装样品并调节好光路,然后远程通过网络设置实验测量的入射角度和光谱测量的能量范围,实验测量结束后可立即获得实验结果.远程实验系统还包含视频监视系统,可以在实验中对整个系统进行监视.     

基于虚拟仪器技术的超临速自磨机振动测试与分析

介绍了开发超临速自磨机的现实意义及超临速球磨机的磨矿特点,并利用虚拟仪器振动测试技术对超临速自磨机在工作状态下进行了振动测量,得出其振动烈度以及振动规律.并测出超临速自磨机的关键部件-导向机构的固有频率.     

基于二维频率估计的MIMO-ISAR空时二维回波重排方法

为联合利用MIMO-ISAR空时采样信号进行成像,该文提出一种基于2维频率估计的MIMO-ISAR空时2维回波重排方法。该方法通过对空域和时域信号频率的比值进行估计,实现空时信号的有效重排,插值为均匀数据后,利用FFT完成方位向压缩。与现有方法相比,该方法利用现代谱估计算法的超分辨性能,提高了参数估计精度,并且采用随机霍夫变换(Randomized Hough Transform, RHT)估计2维频率比值,使得该方法在空域采样信号频率发生模糊时仍适用。仿真结果表明该方法可有效联合空时信号成像。     

石油和化工行业智能优化制造若干问题及挑战

石油和化工行业是国家的基础性产业,目前面临转型升级的重大需求.本文首先回顾了石油和化工行业在生产全流程的信息检测、建模、优化控制,企业经营管理决策以及故障监测和安全环保等几个方面的进展.剖析了当前石油和化工行业存在的主要问题,提出了利用现代信息技术从生产、管理以及营销全流程优化出发,推进实现石化行业智能优化制造的智能化、绿色化、安全化的愿景目标,讨论了石油和化工行业智能优化制造所面临的新挑战.     

临床试验知情同意书的设计规程及范例

临床试验知情同意书分“知情告知”与“同意签字”两部分, 其设计应符合完全告知、充分理解、自主选择的原则, 必要时还应设计帮助受试者理解研究目的、程序、风险与受益的视听资料。临床试验前需作筛选检查, 收集生物标本, 必须得到两种知情同意, 一种用于生物标本的收集和分析, 另一种用于得出满意实验室结果并符合纳入标准后参加试验。本文介绍了知情同意书的设计规程, 包括设计依据、设计原则、格式、内容与印刷的规定, 以及知情同意书的范例。     

An elasticity solution of functionally graded beams with different moduli in tension and compression

In this study, we analytically solved the problem of a functionally graded beam with different moduli in tension and compression under the action of uniformly distributed loads. By determining the location of the unknown neutral layer of the beam, we first established a simplified mechanical model based on complete partition of tension and compression. Using boundary conditions and continuity conditions of the neutral layer, we obtained an elasticity solution of the problem, in which grade functions of tensile and compressive moduli of elasticity are assumed to be two different exponential expressions while Poisson's ratio is unchanged. The numerical results and comparison also verified the validity of the analytical solution. By changing the grade parameters of the material, the stress and displacement of the beam in three cases, i.e., the tensile modulus is greater than, equal to, or less than the compressive modulus, are discussed, respectively. The result shows that due to the introduction of bimodular effect and functional grade of materials, the maximum tensile and compressive bending stresses may not take place at the bottom and top of the beam, which should be given more attention in the analysis and design of structures made of functionally graded materials with bimodular effect.     

Pro/E机构仿真模块行走机器人创新设计

国际上行走机器人的流行设计方法是在每个活动关节处安装伺服电机,根据生物的行走姿态建立数学方程并求得位移的解析解,编程控制各伺服电机的运转,获得步行运动轨迹。该设计模式数学求解过程复杂很难获得正确的解析解,一般利用数学矩阵方程组获得运动轨迹精确的数值解。由于行走机器人属于尖端复杂技术领域,其流行设计方法几乎是唯一可循模式,直接负面后果是伺服电机或液压油缸数量众多、机构笨重、制造昻贵、控制策略难度增大。作者企图通过Pro/E机构仿真模块,结合六杆机构运动模拟,以单电机动力源通过杆件约束求出单自由度的行走机器人近似步态轨迹。     

WC/天然沸石纳米复合材料的微结构表征及性能

以酸处理后天然沸石为载体, 偏钨酸铵(AMT)为钨源, 经混合球磨制备了AMT/天然沸石复合前驱体, 在CH₄/H₂混合气氛中升温至900℃进行还原碳化, 制备了碳化不同时间的系列WC/天然沸石纳米复合材料. 采用XRD、TEM、HRTEM、STEM-Z衬度像等方法对样品的物相、微观结构和WC空间分布进行系统表征. 采用三电极体系粉末微电极方法测试了样品在碱性溶液中的电化学催化活性. 结果表明: 由于载体天然沸石孔隙和表面积优势, AMT/天然沸石前驱体在CH₄/H₂混合气氛中能快速还原并碳化, 形成小尺寸和高分散的以活性相W₂C和WC为主的WC/天然沸石纳米复合材料, 并以碳化还原4 h获得的碳化钨晶粒度最小, 分散性最佳, 含量相对最高, 并具有最佳的电催化活性.     

Secondary Recrystallization Behaviors of Grain-Oriented 6.5 wt% Silicon Steel Sheets Produced by Rolling and Nitriding Processes

By rolling and nitriding processes, 0.23- to 0.3-mm-thick grain-oriented 6.5 wt% silicon steel sheets were produced. The core losses of grain-oriented 6.5 wt% silicon steel at frequencies ranging from 400 Hz to 20 k Hz were lower than that of the grain-oriented 3 wt% silicon steel with the same thickness by 16.6–35.8%. The secondary recrystallization behavior was investigated by scanning electron microscopy, energy-dispersive spectroscopy, and electron backscattered diffraction. The results show that the secondary recrystallization in high-silicon steel sheets develops more completely as the nitrogen content increases after nitriding, secondary recrystallized grain sizes become larger, and the sharpness of Goss texture increases. Because more {110}116 grains in the subsurface and the central layer of the sheets have a lot of 20°–45° high-energy boundaries in addition to Goss grains, {110}116 can be the main component through selective growth during secondary recrystallization when the inhibitor quantity is not enough and inhibitor intensity is weaker. The increases in nitrogen content can increase the inhibitor intensity and hinder abnormal growth of a mount of {110}116 grains and therefore enhance the sharpness of Goss texture.