应用人工神经网络预测油井产量和产水量

论述了应用人工神经网络技术预测油井产油量和产水量的方法．利用油井过去实际每个月的日平均产油量和产水量做为网络的训练样本，经网络学习后，输入油井待预测的时间，可预测出相应时间的日平均产油量和产水量．同时，编制的通用软件经胜利油田２１口井实际产油量和产水量检验，结果表明：网络是一种可行性的预测油田单井产量的方法     

经Wiltse入路联合伤椎固定治疗无神经损伤胸腰段 骨折的临床疗效分析

目的探讨经Wiltse入路联合伤椎固定治疗无神经损伤胸腰段骨折的临床疗效。方法对2011年1月至2017年3月收治的73例胸腰段单一椎体骨折患者的临床资料进行回顾性分析。按手术方式的不同分为两组:A组为传统后正中入路跨伤椎固定组,共33例;B组为经Wiltse入路联合伤椎固定组,共40例。比较两组患者一般情况:手术时间、手术前后血红蛋白差值、下地时间;临床症状:视觉模拟评分(VAS)、Oswestry功能障碍指数(ODI);影像学指标:术后1周伤椎前缘高度比、Cobb角及末次随访伤椎前缘高度比、Cobb角。结果所有患者获得随访,时间为11～20个月,平均15.6个月,术后均无内固定松动、断裂等并发症的发生。B组在手术时间、血红蛋白差值、下地时间以及VAS评分、腰椎ODI评分方面均优于A组,差异有统计学意义(P 0.05);术后1周伤椎前缘高度比、Cobb角2组间差异无统计学意义(P 0.05);末次随访时B组相比于A组,伤椎前缘高度比、Cobb角丢失较少,差异有统计学意义(P0.05)。结论经Wiltse入路联合伤椎固定,具有手术时间短、出血少、痛苦小、术后康复快及并发症少等优点,且伤椎高度及Cobb角恢复满意,值得临床推广。     

Enhanced resistive switching properties of HfAlOx/ZrO2- based RRAM devices

Resistive Random-Access Memory (RRAM) devices are recognized as potential candidates for next-generation memory devices, due to their smallest cell size, high write/erase speed, and endurance. Particularly, the resistive switching (RS) characteristics in oxide materials have offered new opportunities for developing CMOS-compatible high-density RRAM devices. In this study, the RS behavior of HfAlO_x/ZrO₂ thin films sandwiched structure between TiN bottom electrode and Au top electrodes were investigated. It was found that Au/HfAlO_x/ZrO₂/TiN stacks were superior in terms of RS performance when compare to Au/HfAlO_x/TiN memory stacks. The devices demonstrated a good resistance ratio of high resistance state and low resistance state ～10³ for Au/HfAlO_x/TiN and ～10⁵ for Au/HfAlO_x/ZrO₂/TiN stacks, respectively. Both stacks showed good retention characteristics (>10⁴ ?s) and endurance (>10³ cycles). The experimental current-voltage characteristics fitted with different conducting mechanisms, the linear lower bias region is dominated by ohmic conductivity, whereas the non-linear higher bias region was dominated by space-charge limited current conduction mechanism.     

一维稳态导热过程中的传递

依据热力学第二定律和傅里叶导热定律，建立了一维稳态导热过程中的传递方程及损方程，并分析了传递与热传递的本质区别。     

中介蝮蛇毒神经毒素对家兔隔神经放电的影响

用记录脶神经和脶肌的呼吸性发放的方法，对新疆中介蝮(A．intermedius Strauch)蛇毒急性中毒引起的呼吸麻痹，分别用家兔和大白鼠进行了实验分析。将稍大于最小致死量(0．1mg／kg体重)的中介蝮蛇毒，经静脉或肌肉注入动物体内，一般经数小时后出现软瘫性呼吸麻痹，若及时地给予人工呼吸，则在膈肌的呼吸性发放完全停止的情况下，心电和膈神经的呼吸发放都尚可维持相当长的时间。若将蝮蛇毒直接注入侧脑室内，甚直达每公斤体重30-50微克，不引起动物出现明显的呼吸困难。若将脑室注射量加大每公斤体重100mg以上，则动物经一定时间出现4肢僵直，头后仰，抽搐等症状而死亡。在离体标本上，蝮蛇毒具有不可逆地阻遏接头传递的阻遏过程相似。     

裂隙连通性研究的重正化群方法——以一个二维裂隙模式为例

文章提出一种二维裂隙网络模式，依据标度不变性原理，运用重正化群技术求取了裂隙网络模型连通概率的临界值为０．２９２８９３３，对应的单条裂隙导通的临界概率Ｐ０ｃ为０．３５８１２０９。当单条裂隙的导通概率Ｐｂ小于Ｐ０ｃ时，网络连通仅是局部的；而当单条裂隙的连通概率Ｐｂ大于Ｐ０ｃ时，则整个裂隙网络是连通的。同时求取了关联长度指数值和分维。     

Windows95与DOS、Windows3.x双重引导的实现方法

利用OS／2操作系统硬盘分区功能，在同一硬盘上建立两个主分区，再在两个主分区上安装两个操作系统称为双重引导。本文详细介绍了这一方法，为解决现有某些软件和硬件与Windows95不兼容问题，找到了较好的途径。     

粘土空心砖的热物理性能分析

本文提出热物理性能应作为粘土空心砖的主要性能指标，并对粘土空心砖的传热过程和热导率进行了分析。     

Conduction of the impulse in the ischemic myocardium — implications for malignant ventricular arrhythmias

Summary Ventricular arrhythmias occurring consequent to regional disturbances of myocardial perfusion are the most frequent cause of sudden cardiac death. They are related to marked changes of impulse propagation in the ischemic region, which consist of circulating excitation with re-entry. Mapping of the impulse during ventricular tachycardias and ventricular fibrillation shows that the circus movements change their shape and localization from beat to beat. Zones of tissue which block the impulse during one beat may conduct the impulse at a fast rate during the next beat. The main cause underlying this behavior is the depression of the ischemic action potential. This depression is caused by the partial inactivation and the prolonged recovery of the rapid sodium inward current. In addition to the decrease in resting potential, other factors, such as acidosis, contribute to the inactivation of the inward currents generating the upstroke of the action potential. An increase of coupling resistance between myocardial cells and/or an increase of extracellular resistance appear to be less important for explaining conduction disturbances in acute ischemia.     

Cu_xS法导电PAN纤维的导电耐久性研究

本文对CU_xS法导电PAN纤维的导电耐久性不理想的表现和原因进行了分析。提出一系列提高导电耐久性的措施,指出活化预处理和多硫化物后处理对提高导电耐久性具有明显的效果,并对其作用机理进行了探讨。在此基础上制得了导电耐久性优良的导电PAN纤维。