存储

Optical pickup is one of the kernels of optical storage industry. It is used for all kinds of optical storage systems widely. It consists of optical collimator system, optical focusing system, servo error signal generating system and the enforce element of servo system .

中文题名DVD光学读取头关键技术研究副题名外文题名 On key technology of DVD pickup 论文作者王继平导师阮玉学科专业物理电子学研究领域\研究方向学位级别博士学位授予单位华中科技大学学位授予日期2003 论文页码总数173页关键词DVD 光学读取头光盘光存储馆藏号BSLW /2003 /TQ597 /2 光学读取头是光存储产业的核心器件，它广泛应用于各类光存储设备中。

Using Solid Immersion Lens is another method to realize near-field optical data storage. Here with a basic optical system of SIL, a static SIL optical storage system is built up, and a result of ~450nm recording track is obtained on CD-RW disc.

在固体浸没透镜近场光存储方面，首先建立了适合SIL存储的初级光学系统，采用该系统与SIL相结合，建立了SIL静态存储装置，且在CD-RW相变光盘上，实现了线宽约为450nm的静态实验结果。

Scientists have been working on volume holographic storage, thecharacteristic of which is to store and retrieve data on the interference pattern.

然而，这些存储体都是二维存储方式，在单位面积上有存储数据量和传输率的物理极限。

The connecting unit can receive electric signal, the internal memory can store data, the processing unit can choose switching between the first and second operation modes in accordance with the electric signal, and access of data according to the chosen operation mode, and the display can show the information of control and condition of the storing device.

一种可携带的存储装置，可切换于第一操作模式与第二操作模式，存储装置包括有：连接单元、处理单元、内存和显示器，连接单元可接收电信号，内存用以存取数据，处理单元依据电信号选择性地于该第一与第二操作模式间做切换，并依所切换的操作模式进行数据的存取，显示器可显示存储装置的控制及状态信息。

You can store data on secondary storage devices, such as a direct access storage device or magnetic tape volume.

你可以在辅助存储设备上存储数据，例如直接存取存储设备或者磁带。

Magneto-optical recording has the advantage of both magnetic recording and light recording. With the development of the magneto-optical material theory and the preparing methods, the researches on measurement of magneto-optical characteristic are very important.

磁光存储兼有磁存储与光存储的优点，随着磁光材料理论与制备方法的发展，磁光记录介质的磁光特性检测技术的研究显得尤为重要。

But it is difficult of system design to realize real-time data memory. Combining relational database and data documents can not only meet the demands of users on the efficiency of data retrieval but also guarantee the real-time memory of mass data.

实时数据的存储是系统设计的难点，采用关系型数据库和数据文件相结合的方式存储数据，满足用户对数据检索效率的要求，同时保障海量数据的即时存储。

The contents of the course include: what operating system are, what they do, how they are designed, and where they came from; a general history and explanations of computer system, and some discussion on hardware and the relation between operating system and other software; concept of process, process states and process control block, process queue, management of processes; concepts of sequent programming and parallel programming, process synchronization and its application, process communication; scheduling level and job state transition, job scheduling, process scheduling, and methods for scheduling; deadlock and its necessary conditions, deadlock prevention, control and recovery of deadlock; fixed partition, multiple partition and replacement partition memory management, swapping and overlays; page, segmentation and segmentation with paging storage management, basic concept of virtual memory management, and page, segmentation and segmentation with paging memory management.

课程的内容包括：计算机系统概述、操作系统的形成、发展、功能、特性、类型和发展趋势；操作系统的硬件环境、操作系统与其它系统软件的关系；进程的概念、进程的状态和进程控制块、进程队列、进程的管理；顺序程序设计和并行程序设计概念、进程间的同步与互斥、同步机构应用、进程间通信；调度的层次和作业状态转换，作业的调度、进程调度、调度算法；死锁问题的提出、死锁的必要条件、死锁的预防、避免、控制和恢复；固定分区、可复分区、多重分区内存管理技术以及覆盖技术和交换技术；分页域、分段域、段页域存储管理技术、虚拟存储管理的基本概念、分页域、分段域、段页域虚拟存储管理。

The pattern 11010010, for example, might be binary data—in this case, the decimal number 210—or it might be an instruction telling the computer to compare data stored in its switches to data stored in a certain memory-chip location.

例如，11010010这个模式可能是二进制数据——在这种情况下，代表210这个十进制数字——或者它可能是一条指令，告诉计算机将存储在其交换设备中的数据与存储在存储芯片某个位置的数据进行比较。

It is because the spending of area and power of the SRAM memory cell takes a lot of percentage of the whole macro modules'. Using the α exponent MOSFET model to result the word line、bit line power model and delay model, together with the area model and analysis of the read/write reliability, we bring out a method to optimize the memory cell and evaluate the performance of the result.

特别对占模块面积和功耗绝大部分比例的SRAM存储单元做了细致的设计和仿真实验，通过采用α指数MOSFET模型推导出SRAM的字线、位线功耗模型和延迟模型，并配合存储单元的面积模型和读写可靠性分析，提出了一种优化存储体单元结构的方法，并对优化前后的性能进行了评估。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。