Results PET system resolution did not vary with the total radioactivity.

Observers in dark sky areas have been reporting as many as 15 Perseids per hour, that rate could double by early Tuesday morning when the shower peaks.

在黑暗区域的观察家表示，每小时最多有60颗英仙座流星，周二清晨流星雨达到高峰时，实际落下的流星数可能会加倍。

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AZUZ: Every year, Perseus gets a space shower-well, kind of.

每年，英仙座都会有一次太空雨——嗯，可以这么说。

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Bright stars in Perseus extend into the gap between the foreground trees.

在图的下方，英仙座的几颗亮星延伸到了前景树影的间隙中。

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Analysis of an outburst of 1991 Perseid meteor shower

1991年英仙流星雨大爆发的分析

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Observations of a bright blue compact reflection nebula in Perseus

对英仙座一个亮蓝致密反射星云的观测

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Distance of the perseus spiral arm in the Milky Way

银河系英仙臂的距离

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System of Symbol Expression for Analysis of Elastic Solid

弹性力学方程的符号表达式系统

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Every language has its own unique system of time expression units.

任何一种语言都有时间方面的表达，并且各自构成系统。

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Problem Comprising System and Its Expression Way in Urban Planning Design

城市规划设计中的问题蕴含系统及其表达方式

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Power system structure knowledge expression based on relationship database

基于关系数据库的电网结构知识表示

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Methods: The study was performed with primary cultured neonatal rat cardiomyocytes. Intracellular pH was measured using microplate reader of multi-wavelength measurement system; Expression of phosphorylated ERK protein was determined by western blot. Results: 1.

研究方法：选用原代培养的新生SD大鼠心肌细胞，应用全波长多功能酶标仪测量系统测定心肌细胞内pH值；用western blot检测心肌细胞ERK的磷酸化水平。

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The weak points of China's present statutory marital property system find expression in the clash between the doctrine of separate conjugal personalities in their personal rights and the doctrine of integrated conjugal personality in property relation.

我国现行夫妻法定财产制存在严重问题，集中体现在夫妻人身关系的别体主义与夫妻财产关系的一体主义并行所产生的冲突。

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In this world, lots of symbols and simulations are created and they quickly cover the generation and expression of language and words, subvert the traditional system of expression and result in a completely new experience field.

在这里符码和拟象的大量生成和复制，迅速覆盖了语言、话语的生成和表达，颠覆了传统的表征系统，构成了全新的经验领域。

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This review tries to have a brief introduction on the progresses of Trichoderma spp molecule biology, such as gene cloning, tansforma-tion system, expression system and recombinant protein expression.

本文试从木霉基因克隆、转化系统、外源基因表达、重组蛋白的分泌等方面对木霉菌分子生物学研究进展进行综述。

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In the development of visual culture, the mass media rises to push a function for help, the development of visual culture also affects the system of expression of the mass media at the same time.

在视觉文化的兴起和发展中，大众媒介起到了推波助澜的作用，同时视觉文化也影响着大众媒介的表达系统。

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At first, this paper simply introduces π-calculus syntax and semantics and describes the system by expression of process algebra, then analyses the π-calculus ability of modeling.

本文在简单介绍π演算的语法和语义基础上，用进程表达式对整个系统软件结构框架进行了形式化描述，并分析了π演算的建模能力。

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Objective To clone human tumor necrosis factor-related apoptosis-inducing ligand ( TRAIL, 114-281) cDNA and develop an inducible system for expression in E. coli.

目的应用基因工程技术克隆人肿瘤坏死因子相关凋亡配体分子胞外区（TRAIL）114~281片段的cDNA，构建其原核表达载体，建立原核表达体系。

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In this research the hirudin gene was synthesized and put into yeast system for expression. The efficiency of gene expression was valued and some factors affecting it were probed.

在该项研究中将水蛭素基因转入酵母系统中进行表达，以评价人工合成基因在真核系统中表达的效率和探讨影响表达水平的因素。

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A Multi-Crossover Genetic Algorithm and Its Application in Job Shop Scheduling System cross-lineage expression and "null cell" type.

一种求解Job shop问题的多向交叉遗传算法交叉表达；

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Similarly, we first derived the system capacity expression of MIMO systems with nonlinear distortion, and then studied power allocation problems under this environment.

同样的，本文首先推导了非线性失真环境下的MIMO系统容量公式，随后研究了非线性失真环境下的功率分配问题。

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