浅议基于同轴缆入户的双向接入产品

基于同轴缆入户的双向接入技术，以其避免“穿墙打洞”的主要优点，仍然是在现有楼群中部署双向改造的主要方案。本文试图从产品的角度、而不是从技术的角度，给出基于同轴缆入户的双向接入产品的一般描述，以及使用本公司ADoC技术及其芯片组设计这些产品的功能结构图。     

Small Stress Change Triggering a Big Earthquake： a Test of the Critical Point Hypothesis for Earthquakes

Whether or not a small stress change can trigger a big earthquake is one of the most important problems related to the critical point hypothesis for earthquakes. We investigate global earthquakes with different focM mechanisms which have different levels of ambient shear stress. This ambient stress level is the stress level required by the earthquakes for their occurrence. Earthquake pairs are studied to see whether the occurrence of the preceding event encourages the occurrence of the succeeding one in terms of the Coulomb stress triggering. It is observed that the stress triggering effect produced by the change of Coulomb failure stress in the same order of magnitudes,about 10-2 MPa, is distinctly different for different focal mechanisms, and thus for different ambient stress levels.For non-strike-slip earthquakes with a relatively low ambient stress level, the triggering effect is more evident,while for strike-slip earthquakes with a relatively high ambient stress level, there is no evident triggering effect.This water level test provides an observational support to the critical point hypothesis for earthquakes.     

油井远程智能监控系统

根据采油厂油井监控的需求,将油井数据采集、网络视频监控技术和无线通信技术紧密结合起来,设计规划适用于油井的远程智能监控系统。重点介绍了远程智能监控技术的系统原理、组成结构、实现方式及其实际应用效果。     

SXDG-1型汽车前照灯全自动检测仪的微机控制

SXDG—1型汽车前照灯全自动检测仪是用于检测汽车前照大灯光轴的偏斜情况及发光强度并进行定量检验的专用设备。它可以自动测出有关参数,并予以数字显示和打印输出。本文介绍了该仪器的主要性能、工作原理及微机控制系统(包括硬件结构和软件设计思想等)。     

关于广义四元数代数上矩阵的迹的一个等式

众所周知,相似矩阵的迹相等对于非交换代数和环上的矩阵不一定成立,有趣的问题是给定一个条件使得相似矩阵的迹相等对于非交换代数或非交换环上的矩阵成立。本文对于特征不是2的任意域F上定义的广义四元数代数上的两个矩阵A和B,给出如果A和B相似并且它们的主对角线上的元素在F中,那么它们的迹相等。     

三矩阵乘积的 Moore-Penrose 逆

本文以矩阵的秩为工具给出了三矩阵乘积 ABC 的 Moore-Penrose 逆满足逆序律(ABC)+=C+B+A+的充要条件,同时也给出了该结果的若干推论及应用.     

四川地区宫颈癌组织HPV18和HPV45 E6基因突变分析

采用聚合酶链反应技术对四川地区2003~2004年收集的60例宫颈癌患者的癌组织DNA进行人乳头瘤病毒(HPV) E6基因扩增, 获得HPV18和45型E6基因. 序列分析发现, 18型三例E6基因有同样的两处同义突变; 45型两例E6基因发生突变, 一例有两处碱基突变, 另一例发生六处碱基突变, 其中两处涉及氨基酸变化, 均位于E6抗原决定簇区. HPV45型E6基因中134位c→t, 157位c→t, 259位g→t和341位t→c的碱基点突变未见报道. 另外， 该地区HPV18和45型突变株之间存在碱基互变,  它们之间的最小差异比野生型HPV18和HPV45之间的差异小4.05%, 该数值比在非洲发现的突变株的要小很多, 该结果支持HPV18和HPV45可能起源于非洲的观点.     

Studies on Aggregation Interaction between Reduced Denatured Egg White Lysozymes during Refolding Procedure in Urea Solution

The aggregation interaction between reduced-denatured egg white lysozymes during refolding procedure in urea solution was studied by means of reducing and non-reducing protein electrophoreses. Results of non-reducing sodium dodecyl sulphate polyacrylamide gel electrophoresis （SDS-PAGE） of the supernatant and aggregate precipitate formed in refolding process show that except being refolded to native egg white lysozymes, the reduced-denatured lysozymes can also form the aggregates with molecular weights （MW） being separately about 30.0 and 35.0 kD, while the reducing SDS-PAGE and the refolding results in the presence of sodium dodecyl sulphate show that these aggregates are formed chiefly through the misconnection of disulfide bonds between the reduced-denatured lysozymes, and the aggregate precipitates are formed through the non-covalent interactions between the aggregates with molecular weight being about 30.0 kD. From the results of electrophoresis and size-exclusion chromatographic analyses, it can be inferred that the aggregates with molecular weights being about 30.0 and 35.0 kD are bi-molecular and tri-molecular egg white lysozyme aggregates, respectively. And finally, a suggested refolding mechanism of reduced-denatured egg white lysozymes in urea solution was presented.     

谐振器加载石墨烯的双通带可调滤波衰减器设计

石墨烯材料在微波段的阻抗可控特性是其最有价值的应用特性之一。文中首次分析了石墨烯对微带 多模谐振的影响机理,提出了一种集成滤波衰减功能为一体的灵活可控器件。首先,对不同位置加载石墨烯的微带双 模谐振器进行了严格的等效电路建模,通过奇偶模分析法及输入导纳参数计算,探究了双模谐振受石墨烯阻抗及其加 载位置的影响,明晰了石墨烯材料对微波谐振器的影响。随后设计了动态可调的滤波衰减器并阐述了石墨烯材料在谐 波控制上的潜在应用点。最后,采用不同尺寸的双模谐振器进行石墨烯加载并完成双通带幅度独立可控的滤波衰减器 的设计,仿真与实测结果吻合良好,验证了阻抗可控石墨烯材料在可调微波衰减类器件上的应用前景。     

计算机线缆的电磁信息泄漏智能分析方法

计算机系统中的各型线缆会通过电磁传导发射泄漏内部信息,导致信息安全问题. 为了分析来自计算机线缆的电磁信息泄漏,提出了基于深度学习的智能分析方法. 设计一维卷积神经网络算法,对电磁泄漏信号进行深层的特征提取与学习,从泄漏的电磁信号中智能识别泄漏源的线缆类型,进而分析其中泄漏的视频信息. 实测结果表明,本文提出的方法,在未知目标信号特征的情况下,能够有效识别电磁信息的泄漏源与泄漏信息,为计算机线缆提供了一种电磁信息泄漏的智能分析手段.