Based on historical documents and investigation data, the main characteristics of earthquake disas-ters in Aba Prefecture were systematized and summarized in some degree and some proposals about the preparedness of potential earthquake disasters were offered.

The radiochemical purity of radioiodinated 7 α-O-IA-DPN is more than 95%, and still greater than 90% kept for 24 h at room temperature. Radiochemical yields is 81%~ 90%, and specific radioactivity is 83.25 PBq/ mol.

研制结果为：碘标记的7αO IA DPN放化纯度大于95%，标记率为81%～90%，比活度高达83.25PBq/mol，室温下放置24h，放化纯度仍大于90%。

The visible absorption spectra of p-benzoquinone ( PBQ) in CS_2 were measured, and a weak absorption band around 507 nm attributed to n-π~ singlet-triplet transition was demonstrated.

测量了对苯醌（p-benzoquinone，PBQ）在CS2中的可见吸收光谱，论证了该实验中发现的507nm带来源于PBQ的n-π单-三态跃迁。

The CIDEP spectrum of p-benzosemiquinone/ ethylene glycol ( PBQ/ EG) system has been obtained experimentally with the time-resolved ESR spectrometer by using 285 nm laser photolysis.

在285nm紫外激光辐照下，用时间分辨电子自旋共振（TRESR）波谱仪研究了对苯醌/乙二醇（PBQ/EG）体系，得到了发射的苯半醌中性自由基PBQH.和乙二醇碳自由基R。

Because of the several resonance frequencies of multi-frequency antenna far from each other, we should guarantee enough bandwidth of PBQ which should cover all the frequencies.

由于多频带天线具有多个谐振点，并分布相差较远，光子晶体设计的关键问题之一是需要保证禁带带宽，使得能够覆盖多个谐振点，实现光子晶体结构对各个谐振频率点的优化作用。

Based on the radiation protection monitoring, the radiation protection of a 2.8 PBq 60 Co irradiation equipment run about ten years are summarized and assessed.

从辐射防护角度，对一座2.8PBq60Co辐照装置运行近10年的辐射安全进行总结与评价。

Structural Properties of a Small Plasmid from pBR 322 with Deletion and Recombination

由pBR322缺失重组构建的一个小质粒的结构特征

In computer graphics, Point-based rendering ( PBR) is a very new research area.

基于点的真实感绘制是计算机图形学中的一个新课题。

The number of defects found per person-hour was also less using the PBR technique.

使用PBR技术的找到缺陷所需的人时也少得多。

PBR strategy is a better trade-off between the system reorganization time and service availability.

PBR是兼顾系统重组时间和系统服务可用性的折衷策略。

Conclusion The key to prevent the complications is to control indications and to have the skillful procedure of PBV operation. It is profit for PBV safety to deal with complications during operation.

结论严格掌握PBV适应证、熟练操作，是预防PBV并发症的关键，处理好有关并发症，有利于提高PBV的安全性。

Objective To analyze the complications of percutaneous balloon valvuloplasty ( PBV) in 1314 cases, and to study the causes and preventive method of the complication.

目的分析1314例经皮球囊瓣膜成形术（PBV）手术的并发症，探讨其发生原因和防治方法。

Methods: The PBV and superior sagittal sinus were dissected with operating microscope on 40 adult cerebral specimens and their histological section were observed.

方法：通过手术显微镜和组织学切片，对40例脑标本的桥静脉和上矢状窦进行观测。

Results A recombinant plasmid pBV/ IL-2/ PEA was constructed.

结果经鉴定，获得重组质粒pBV／IL－2／PEA。

Here is my ticket, Numer Four.

四号,这是我的牌子.

Dormitory a small numer number of students or many hundreds.

有的宿舍楼只能容纳少量的学生,有的则能容纳数以百计的学生.

When the amount of PGTE in the E-51/ Polymercaptan system is 30 pbw, the tensile strength and the tear strength is increased 116% and 126% separately, without substantial decrease of the curing rate and thermal stability of the cured product.

当PGTE加入量为30（pbw）时，室温快速固化特性和固化物的耐热性基本不变，铁片粘接的剪切强度与不均匀扯离强度则分别提高了116%和126%。

It presented the key technologies of power-by-wire ( PBW) electrically powered actuation systems including high performance hard magnetic material, brushless DC motor-pump, integrated designing and manufacturing, redundancy management, fast response and high precision control.

阐述了发展该机载一体化电作动系统的关键技术，包括高性能永磁、无刷直流电机-泵及其集成设计、冗余管理、高响应高精度控制等；

The results indicated that there was a stronger negative correlation between direct and maternal genetic effects for NOBT and PBW than for NOBA.

结果表明，母体遗传效应对繁殖性状直接遗传效应的选择有不利影响。

Simulation results show that the EHA can meet modern aircraft's requirements to the actuate system, and it can be used widely in the future PBW flight control system.

结果表明，EHA的性能能够满足现代飞机对作动系统的要求，在未来功率电传（PBW）的飞控系统中具有很好的应用前景。

The Enveloping Algebras of τ-Lie Algebras and Their PBW Theorem

τ-李代数的普遍包络代数及其PBW定理