记录密度

近年来，国内外开发的NP氧化铁磁粉，包钴NP磁粉、金属磁粉和钡铁氧体颗粒，将在音像技术、数字磁盘等高记录密度领域中占据重要地位。

In recent years the newly developed at home and abroad NP iron oxide magnetic powder , cobalt-surface-modified NP particles , metallic magnetic powder and barium-iron-oxygen particles will have an important role to play in high recording density applications such as in the areas of audio-video technology and digital disks .

单极型磁头垂直磁记录密度大小的理论分析

Theoretical analysis of perpendicular magnetic recording density of single pole head

激光波长是限制DVD记录密度提高的关键因素，研制短波长激光器是超高密度DVD用光源的重要发展方向。

DVD recorded density is mainly limited by laser wavelength , It is important to study short wavelength laser for super high density DVD system .

在短波区域，ZnO可用于制造紫外发光器件和紫外激光器，对于提高光记录密度及光信息的存取速度起着非常重要的作用。

In short wave region , ZnO can be used to fabricate UV light emitting and UV laser devices , which is very important for improvement of memory density and optical information access speed .

提出了以提高线性记录密度为目的的优化选择结构参数的准则，同时对常用的几种RLL编码方式进行了比较。

The principle of optimal selection of RLL code parameters which achieve high linear density is also proposed . Comparisons of several RLL codes are given at last .

DVD光盘刻录机是一种以光盘为存储媒介的录像机，他记录密度高、容量大，可实现记录图像和音质的高保真，可以任意进行编程播放、快进、快退、重复和跳曲等功能。

DVD disc recorder is a kind of recorder by disc as memory medium with high consistency and capacity , fulfilling the high fidelity of the picture and timbre and with the functions of program playing , forward playing , backward playing , repeat and skip playing , etc.

此研究结果达到了我们的研究目的，对于提高磁记录密度具有非常重要的意义。

This result is important for improving the magnetic recording density .

高记录密度铁氧体薄膜

Ferrite thin films for high recording density

随着记录密度的不断提高，头盘浮动间隙不断减小。

With the continual increase of the recording density , the head-disk gap is decreased accordingly .

在此情况下，超顺磁效应成为当前限制记录密度提高的主要因素。

Under this condition , superparamagnetic effect becomes the fundamental factor limiting the improvement of recording density .

蓝光激光源和全息存储预示着未来光学数据存储中高记录密度的实现。

The blue laser source and the holographic storage promise high recording density in future optical data storage .

从而使磁层变薄，提高记录密度、信噪比、取向度等等，为制造高密度磁盘提供了一种重要的工艺。

It is clear that the calendering technology is an important process to the fabrication of high density disks .

如何使产品的记录密度进一步向理论极限值靠近，记录介质&垂直磁化膜的制备成了很重要的一个环节。

The fabrication of the perpendicular recording media becomes the key step which will make the recording density closer to the theoretic value .

磁读出方式与磁光读出方式相比，读出分辨率有很大提高，具有实现远超磁光盘记录密度的前景。

Playback resolution is much improved compared with optical detection and we are expecting that a much higher density than MO disks is feasible .

磁性存储是最常用的海量存储技术，其记录密度越来越高，发展也越来越快。

Magnetic recording is the most popular mass recording technology , which area recording density is much higher , and it develops faster and faster .

根据模拟的结果，分别计算出了0,1信号读出电压的概率密度分布函数，得到了硬盘磁记录密度在15.5Mb/mm2,31.0Mb/mm2,40.3Mb/mm2,46.5Mb/mm2几种不同情况下的数据差错率。

The probability density distribution functions of the read-back peak voltage for the digital 0 and 1 signals were calculated based on the simulation results .

随着磁记录密度的不断增大和磁盘片转速的不断攀升，硬盘驱动器的机械动态性能显得越来越突出，尤其是其抗冲击振动性能已经成为硬盘设计中最重要的技术指标之一。

As the increase of magnetic recording densities and rotating speed of disk , the dynamic characteristics of the mechanical parts become more and more prominent .

目前虽然已有垂直存储产品面市，但是其记录密度仍与理论上预测的记录密度相距甚远。

Although the perpendicular recording product has shown his appearance in the market , its recoding density is much lower than the value predicted in theory .

随着磁盘面记录密度的不断提高，要求磁记录介质具有很高的矫顽力，而要在高矫顽力上记录信息，要求记录磁头材料必须具有高饱和磁感应强度。

With the rapid development of the high density recording , it is required that the magnetic head materials have very high coercivity and saturation magnetic flux density .

从记录密度角度考虑，由于光衍射的限制，最小记录尺寸与激光源的波长成正比。

In this recording means , minimum mark length is proportional to the wavelength of the laser source , because of the diffraction limitation . By means of M .

早期的读/写通道基于峰点检测技术，之后部分响应最大似然通道技术的应用显著地提高了记录密度。

The early technology used in read / write channel is peak detection , magnetic record density has been increased significantly as a result of the application of partial-response maximum-likelihood .

一种二进制编码数据卡片，其记录密度大于穿孔卡片。所记录的数据可由光学或磁学读卡机读出。

A card on which binary coded data are recorded with recording density larger than a punched card . The recorded data can be readout by optical or magnetic readers .

近几年来，由于高矫顽力低噪声介质、薄膜磁阻头、读写及定位技术等方面的重大突破，使记录密度以每年60%的速率递增。

Recently , the magnetic recording density increasing rate reaches 60 % annually due to the breakthrough of high Hc , low noise media , thin film MR head , reading channel and positionning technology .

当前的研究与开发的重点是具有高记录密度，数据传输速率快、稳定性好、载噪比大和误码率低的可擦型光盘存储材料。

The erasable optical disk with high recording density , high stability , high data transfer rate , high carrier-noise ratio and low error rate arc the main points in the research and develop - ment .

随着计算机工业、信息、多媒体技术的高速发展，对计算机外存储设备提出了大容量、高数据传输速率及小型化的要求，而实现该要求的唯一途径是提高记录密度。

With the rapid development of computer industry , information and multimedia technology , high capacity and data rate for computer peripheral recording equipment are required . Increasing the recording density is the unique way to achieve such requirements .

信息存储用磁性介质的记录面密度的不断提高，主要途径之一就是减小磁性颗粒的尺寸。

One of the effective ways to improve the area recording density of magnetic media has been to reduce the size of recording unit .

软件的实现步骤为：首先连接数据库并据密度贪婪算法自动计算每件货物的体积、密度，然后将货物记录按密度降序排序。

The steps of software development are : at first , link the database and auto-count the volume and the density of each encasement then sort descending the encasement according to the density .

于16周末对大鼠腓肠肌进行单纤维肌电图检测（刺激强度为0.1mA，刺激频率为3Hz），记录其纤维密度和平均连续差值；

The gastrocnemius of rats were detected by SFEMG ( at the stimulus intensity of 0.1 mA and the stimulus frequency of 3 Hz ), and the fiber density and mean consecutive difference ( MCD ) were recorded .

不同世代的流体包裹体记录了等密度降温的P－T路径。

Fluid inclusions in different generations record isodensity decreasing temperature P-T paths .

提高垂直磁记录系统记录密度的一项关键技术是要设计和制备出高性能的垂直磁化膜。

One of the key issues for density enhancement in perpendicular magnetic recording is the design and the preparation of high performance perpendicular films .