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magnetic recording 【無線電】磁錄音。

magnetic reluctance

The discovery of the colossal magnetoresistance ( cmr ) in hole - doped perovskite manganites ra1 - xmxmno3 ( ra is a trivalent rare - earth ion and m is a metal ion ) has attracted much attention since 1989 due to not only its technological applications in magnetic recording and sensor , but also the effect of the strong correlation concerning metal - insulator transition in the field of basic research . since then , several physics models have been suggested to explain the mechanism of cmr . however , the exact mechanism of cmr remains to be done 自1989年在摻雜鈣鈦礦型錳氧化物ra _ ( 1 - x ) m _ xmno _ 3 (其中m為金屬離子, ra為三價稀土離子)中發現龐磁電阻( cmr )以來由于其在磁記錄、磁傳感器等方面潛在的應用前景,以及金屬?絕緣體相變等所涉及的強關聯效應,使該類化合物吸引了物理學界的廣泛注意。

To enlarge the application areas of the nano - structured materials , such as applications in magnetic recording media , the well - aligned carbon nano - structures encapsulating with magnetic catalyst particles were successfully synthesized on si wafer by ecr - cvd method with ch4 and h2 as gas sources 為了增加奈米結構材料之應用?圍,例如制作磁記憶媒體,本研究以觸媒輔助電子?旋共振化學氣相沉積法( ecr - cvd )利用ch4及h2為反應氣源,于矽基材上成功的合成鑲埋有磁性顆粒的碳奈米材料。

Meanwhile it can filter the waveform and gather the envelope and calculation the current peak and max steepness of lightning by length of erased magnetic record . thirdly we need analyze the difference of length of erased magnetic record between kinds magnetic tape or pre - recorded sine wave on magnetic tape , and finding the min and max lightning current that can be recorded by magnetic tape . then we confirm the type of the magnetic tapes and the way of installing which fit to the line towers 同時對該波形進行濾波消噪,提取包絡線計算磁帶消磁長度和雷電流峰值及最大陡度第三部分根據mtlcd得出的數據分析不同雷電流通道下不同磁帶、不同預錄正弦波消磁長度的差異及磁帶可以記錄的最小雷電流和最大雷電流,找到可以在輸電鐵塔角鋼上安裝使用的磁帶及其放置方式。

The second part is to develop the program of mtlcd about the magnetic tape wave - form process using matlab software . the mtlcd can display the signal of waveform with the magnetic record being erased in the screen of computer . the observer also can drought or zoom in the waveform at will 第二部分利用matlab作為開發工具編寫磁帶波形處理軟件mtlcd ,該軟件可將磁帶被消磁后的波形信號顯現在電腦屏幕上,并能對波形隨意拉伸放大觀察每一個細節。

Since a lot of applications of ultrafine amorphous iron series alloy have been found in magnetic recording , catalysis , ferrofluid , and wave absorbing materials , etc . , much attention has been paid to the synthesis process of nanostructured fe series alloy 非晶態的鐵系納米材料廣泛應用于磁記錄材料、催化材料、磁性液體、吸波材料等多個研究領域,在眾多納米材料中,納米合金材料由于其特殊的性質受到人們極大的關注。

The magnetic recording of binary characters in which the pattern of magnetization used to represent zeros and ones occupies only part of the storage cell , the remainder of the cell being magnetized to a reference condition 一種二進制字符的磁記錄方法,其中磁化的方式為:僅占用每個存儲單元的一部分來表示“ 0 ”和“ 1 ” ,存儲單元的其余部分被磁化為基準狀態。

Especially y - ni - 22fe , which have been widely used in industry things such as magnetic record heads , transformers or magnetic shielding materials due to its high permeability , low coercive force and relatively high saturation magnetization 特別是- ni - 20fe合金,因其較高的磁導率、飽和磁化強度、低的矯頑力而廣泛用于磁記錄頭、變壓器和磁屏蔽材料等。

We calculate the regression curve about length of erased magnetic record and lightning current peak . we analyze the error of recording data and find a new means about direct measurement of the max lightning steepness with magnetic tapes 作出磁帶消磁長度與霄電流峰值的擬合曲線,對測量數據進行誤差分析,找到利用磁帶直接測量靂電流最大陡度的新方潔。

In magnetic recording , a group of read / write heads that are mounted and moved as a unit for reading and writing on media which consists of two or more tracks such as disks and magnetic tapes 在磁記錄裝置中的一組讀/寫磁頭,它們被安裝在一起作為一個整體移動,可對含有兩條或多條磁道的存儲媒質(如磁盤及磁帶)同時進行讀寫。

The lubrication in nano - scale in the techniques of micro - machine , micro - motor and high - speed magnetic recording system is imperatively to be solved with the development of nano science and technology 隨著納米科學和技術的迅速發展,特別是微型機械、微型電機以及高速磁記錄技術的迅速發展,迫切需要解決納米級的潤滑問題。

At last , a magnetic recording system is built with ferrite material which have a high sn ratio . this system can fulfil the demands of all kinds of recording mode for vhs 最后,將以目前世界最廣泛應用的鐵氧體單晶為材料,設計一個vhs錄像機用高信噪比磁頭系統,使該系統能夠適用于vhs型錄像機各種記錄方式的要求。

Scientists have been devoting to enhance the density of magnetic recording media for years . magnetic materials are expected to be with high coercivity and high saturation magnetization 提高磁記錄介質的密度是人們多年所追求的目標,這要求磁性材料具有高矯頑力和相應的高飽和磁化強度。

In multi - channel digital magnetic record / playback heads , the angle between the parallel lines measuring gap scatter and the nominal direction of tape motion over the head assembly 在多道數字記錄讀出磁頭中,測量間隙變化的平行線與磁帶在磁頭組合件上運動的標定方向之間的夾角。

A specific method for magnetic recording of bits in which each storage cell comprises two regions magnetized in opposite senses with unmagnetized regions on each side 數據位磁記錄的一種特殊方法,各存儲單元包含兩個磁化區其磁化方向相反,每側有一個非磁化區。

Developing new type of magnetic recording media is most important for the recording density of magnetic recording to keep its speed of increasing 隨著各種新型磁頭的應用,研究和開發新型的磁記錄介質己經成為磁記錄存儲密度高速增長的重要保證。

1 . cinematography - magnetic stripes and magnetic recording head gaps for sound record on 16 mm motion - picture film perforated along one edge type 1 - positions and width dimensions 電影技術.單邊穿孔16mm電影膠片錄音用磁帶和磁頭縫隙

Lucky film group , china ' s largest scientific research and production base for sensitive materials , magnetic recording materials , was founded in june 1992年6月,中國最大的感光材料和磁性記錄材料研究生產基地- -中國樂凱集團公司成立。

Identification cards - thin flexible cards - physical characteristics , magnetic recording techniques , test methods - part 2 : magnetic recording techniques 識別卡.柔性薄卡.物理特性磁記錄技術和試驗方法.第2部分:磁記錄技術

The ratio of signal level to noise level ( sn ratio ) is a very important index for vtr and the noise is chiefly from magnetic recording system 信噪比是評價錄像機性能的一個重要指標,而錄像機的噪音主要來源于磁記錄系統。