在操作中

The fifth chapter analyzes the performing requirements of the database of the teaching administration information system and offers design for some databases .

讨论了数据库的接入技术，对数据库的访问和操作也进行了研究，并重点探讨了数据库连接池在系统连接数据库中的作用和具体实现方式。

Alloy membrane is used to separating hydrogen isotope,but after operating tritium,decay product 3He resorts in alloy membrane,forms helium bubble s and affects the macroscopical properties of alloy membrane.

PdY8.5Ru0.19合金是用于氢同位素分离的膜材料，但涉氚操作后，衰变3He会滞留在合金膜中并形成氦泡，影响其宏观性能。

This article describes the successful application of the s7-400 PLC in demagnetization and electric propulsion control system.

本文叙述了SIEMENS公司S7400系列PLC在一个消磁，电力推进控制系统中的成功应用，采用自顶向下模块化设计思路编程，从而实现对整个系统各设备的管理监控，以及PLC与SIEMENS公司0P37操作面板的通讯。

In such computation, the whole sequence DNA molecules are involved in every operation of denaturalization and re-denaturalization, hence the number of experiment steps is important to the computing results of model.

在这样的计算中，每一步变性与复性都涉及到整个序列的DNA分子，因而操作步骤的次数对该模型的计算效果显得尤为明显。

This method requires only the dimensions of systems and the expansion coefficient of density matrix which can be easily got, and the computation is easy, so it has its application value.

此判据仅依赖于系统的维数和密度矩阵的展开系数，而这些数据是易于求得的，使得量子纠缠态的判断简单易行且易于操作，在实际运用中具有理论价值。

The main research contents and results are given as follows:(1) Principles and characteristics of different types of polarization controllers are analyzed, the compare of the difference of these polarization controllers are discussed based on them, drawn a conclusion that the polarization controller which based on squeezing fiber and has variable delay quantity are suitable for high speed optical communication system.(2) The reset principle of the typical four channel polarization controller which is based on squeezing fiber is analyzed, and the design of its concrete reset scheme is given based on them. The reset process and the corresponding operation list are given in detail.(3) The systematical experiment is made when the typical four channel polarization controller is put into the PMD compensator. The experiment result showed that the channel which needs reset can efficiently return to the mean place, and the effect of reset was good, it didn't cause any badness infection on PMD compensation.(4) A new type optical signal time-domain depolarizer is given, and a new PMD compensate method is given based on it.

由此得出延迟量可变型光纤挤压型偏振控制器适用于高速光通信系统的结论；(2)具体分析了典型的四通道光纤挤压型偏振控制器的复位原理，并在此基础上对其进行了具体复位方案的设计，给出了各种情况下的详细复位流程和相应的复位操作列表；(3)将四通道光纤挤压型偏振控制器应用于偏振模色散补偿器中进行系统实验，实验结果表明，需要复位的通道能有效地回到中间值，复位效果良好，且复位未对PMD补偿产生不良影响；(4)设计了一种新型的光信号时域退偏器，并基于该退偏器提出了一种新型的偏振模色散补偿方法。

The available tunneling depth of channel carriers is dependent of frequency. Hence traps density in opposition to dielectric depth is extracted by charge pumping current and frequency.

通道电子能穿隧的深度会随著不同操作频率而改变，因此可由电荷帮浦电流对应到频率便能得知在闸极介电层中不同深度的缺陷密度。

Under the guidance of a Shift Team Leader or his/her designee, operates an assigned portion of the process unit, either manually or through automatic control, complying with safety, Health, Environmental, and Housekeeping Standards.

在轮班工程师的领导下，通过手动或自动控制系统操作工艺单元中指派的工作，并符合安全、健康、环保和清洁的标准。

All locks acquired by statements within a transaction are held for the duration of the transaction, preventing destructive interference including dirty reads, lost updates , and destructive DDL operations from concurrent transactions.

事务内各语句获得的锁在事务执行期内有效，以防止事务间破坏性的相互干扰，例如：脏读取，无效地更新，以及其他并发事务中具有破坏性的 DDL 操作。

Lock Duration 13.3.1.2 锁的持续时间 125 All locks acquired by statements within a transaction are held for the duration of the transaction, preventing destructive interference including dirty reads, lost updates, and destructive DDL operations from concurrent transactions.

事务内各语句获得的锁在事务执行期内有效，以防止事务间破坏性的相互干扰，例如：脏读取，无效地更新，以及其他并发事务中具有破坏性的 DDL 操作。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。