基于质量损失函数的仪器最佳校准周期的确定

根据现行标准,测量器具的校准周期由各生产厂家和研究机构根据具体情况自行规定.田口(Taguchi)质量工程学给出了单质量特性情况下的最佳校准周期确定方法,但没有多质量特性下的计算公式.文中从质量经济性出发,使用马氏距离度量多元测量质量特性,应用田口二次质量损失函数,以数字信号源为例推导其最佳测量周期的理论公式,为该仪器测量周期的确定提供了理论依据.     

雷莫方程及其应用

指出了威里时间平均方程在确定声波孔隙度中存在的一些不足，介绍了以实测资料为基础的雷莫方程及其改进算式，并给出了雷莫方程的计算方法及参数选取，为了核算孤岛油田的原始石油储量，计算现有的剩余储量，达到控水稳油的目的。使用雷莫方程的改进算子对弧岛油田５００多口井的测井资料进行了数据处理，求取了地层孔隙度。     

Isolation, DNA sequence and regulation of a new cell division cycle gene from the yeast Saccharomyces cerevisiae

A new complementation group of temperature-sensitive mutants of the yeast Saccharomyces cerevisiae (ts26-1 and ts26-2) has been isolated and characterized. This mutation maps at 40.7 cM from arg8 and 48.9 cM from arg1 on the left arm of chromosome XV of yeast, providing that it is a newly identified gene. The dumbbell-shape terminal morphology of the mutant cells at the restrictive temperatures is a characteristic of mutants defective in DNA replication. To study the defect of macromolecule synthesis in the mutant cells, DNA, RNA, and protein synthesis were measured at both permissive and restrictive temperatures. The data suggest that the primary defect of this mutation is at the initiation step of DNA synthesis. The gene has been cloned from an S. cerevisiae genomic library by rescue of the conditional lethality of the mutants. It is present as a single copy in the haploid genome. DNA-RNA hybridization of the gene has identified 1 kb RNA, which is under cell-division-cycle control. DNA sequence analysis of the gene has identified an open reading frame capable of encoding a protein of molecular weight 25,055 (214 amino acids).     

东营凹陷南坡异常高压分布与油气运移

东营凹陷南坡异常高压的分布与成藏关系密切,在1500m以下的埋深条件下,可以采用半对数式回归正常趋势线方程求取压实系数,再运用声波时差与地层压力的关系计算剩余压力.研究结果表明,东营凹陷南坡的异常高压在2500m左右开始产生;在平面上,地层剩余压力由洼陷中心向边缘减小,沙三段与沙四段压降特征不同,但主要压降方向均是地下油气运移的主要指向区,其中沙四段存在3个重要油气优势运移指向.     

波分复用波长路由节点的阻塞特性分析

利用概率统计理论的方法，从节点层次上定量分析了节点规模、复用波长数目以及波长转换对波分复用(WDM)波长路由网络中波长路由节点的影响。提出了基于概率统计的节点阻塞模型。数值结果突出表明波长转换能力越强的全光节点，其性能越优。为了提高网络资源的使用效率并增强全光网络的灵活性，必须实现全光网络中的虚波长路由波长转换器。通过数值计算找到了阻塞性能和代价的折中，研究中发现配置较低波长转换能力波长转换器的波长路由节点将会具备更强的性价比优势，当前在构建光通信系统时使用弱波长转换能力的光节点更可行。     

Dale B. Harris (1914-2007).

During his long career, Dale B. Harris was at various times a teacher, author, editor, researcher, high school principal, organizational leader, department administrator, and government advisor. He is probably best known for his research on children's drawings, specifically, his extension of the work by Florence Goodenough that resulted in the Goodenough-Harris Draw-A-Person Test. Harris was a participant in the famed Thayer Conference (1954) on school psychology. He was a delegate to the White House Conferences on Children and Youth in 1950 and 1960 and was active in several professional organizations, including the Society for Research in Child Development (SRCD). He served as president of Division 7 (Developmental Psychology) of the American Psychological Association in 1956. He was also active in community organizations, both in Minnesota and Pennsylvania. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

ZXSM-10设备原理及故障案例分析

通过深入研究分析ZXSM-10设备的原理及相关电路,结合故障案例,介绍设备维修的技能,提出检修思路,对相关设备的运行维护具有一定借鉴意义。     

具有双极性的非相干OCDMA系统性能分析

提出了一种可减少多址干扰的非相干OCDMA编解码方案，该方案利用光开关控制2个单极性编码器和1个具有平衡互补结构的解码器，在1个光学信道上实现了双极性OCDMA信号传输；分析了电光编码、传输、解码、光电转换等环节的信号变化，推导出系统的噪声和误码率公式；与其它CDMA方案比较表明本方案在误码率方面可达到电域双极性CDMA系统的水平。     

单片机控制实现的光纤环路传输实验

设计了以80C552单片微机为核心、接口和爱德万Q8384误码测试仪匹配的环路控制器，实现了信号注入时间、环长、传输环数和测试控制的动态可调。以此环路控制器为基础，搭建了一个4路CSRZ码、单环传输光纤长度为240km的10Gb／s的WDM光纤环路传输系统，进行了传输560km功率代价小于1dBm的传输实验。以此传输系统为对象，分析研究了环路控制器各个控制信号误差对环路系统性能的影响。结果发现，当测试时间对信号前端留出足够余量后，可以有效避免系统瞬态效应对测试的影响。     

道间距对偏移结果影响的讨论

对偏移算法进行了简要回顾，提出对偏移结果产生影响的因素除偏移算法、速度场的准确程度和地震资料的品质之外，还应包括道间距及采样率等。指出道间距过大对偏移结果的影响主要是导致空间假频现象的出现，偏移速度场难以准确建立，偏移横向误差大及偏移信息量少，这些影响与具体偏移算法无关。应用理论模型及实际资料对上述结论进行了验证。根据验证结果，建议在野外施工设计过程中，应根据勘探目的不同、地下构造的复杂程度及勘探精度，并考虑道间距对偏移结果的影响，合理地设计道间距。