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原子力显微镜在液相条件下的成像分析 总被引:1,自引:0,他引:1
本研究利用原子力显微镜(atomic force microscope,AFM)分别对Al2O3纳米模板、云母片及数字光盘在固相及液相务件下进行形貌扫描和云母片上的力 - 距离曲线测量.实验结果分析表明液相条件可以降低针尖的展宽效应,使得形貌成像更能够显示出物体的细微结构.在液相条件下,由于样品表面消除了静电效应和液体的阻滞力结果,力 - 距离曲线显示了较好的力均一性.这些结果为AFM实验技术研究生理条件下的生物样品的形态学及生物分子之间的相互作用力提供了实验可行性. 相似文献
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基于隧道电流检测方式的原子力显微镜纳米检测系统设计 总被引:2,自引:0,他引:2
原子力显微镜(AFM)是当前进行材料表面微观形貌观察及分析的强有力工具之一。本文主要介绍一种隧道显微镜(STM)检测方式的原子力显微镜纳米检测系统(AFM.IPC-208B),该AFM系统设计是在STM.IPC-205B系统设计的基础上,采用隧道电流工作方式,将STM与AFM功能组合兼容。文章详细阐述了AFM.IPC-208B系统的设计原理、镜体、扫描控制以及数据采集。新设计的AFM.IPC-208B系统仍具有0.1nm的分辨率,检测范围为0~2mm×2mm,系统操作简易,工作效率高,与原STM.IPC-205B系统兼容,工作性能稳定可靠。 相似文献
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给出了一种基于单片机的软盘控制系统设计方案,介绍了系统采用的FDC37C78软盘控制芯片,单片机和软盘驱动器之间的接口电路和驱动程序,及在此基础上开发的上位机的应用软件,系统可以通过串口实现对软盘的各种文件操作.以单片机89C58为核心,运用FDC37C78软驱控制芯片,设计了以上位机为操作平台的软盘控制系统.详细说明了系统的整体构架和各模块的功能,并介绍了软盘的文件格式,设计了单片机和软盘驱动器之间的接口电路和驱动程序,同时开发了上位机的应用软件.系统通过串口实现通讯,成功地实现了对各种软盘的文件读写,格式化等功能.同时可将上位机程序移植到ARM或其他控制器上,适合工厂现场操作. 相似文献
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提出了一种基于MPEG-2编码的高密度光盘新标准,并介绍了新标准光盘的制作系统。新标准将在容量为4.7GB的DVD光盘上记录超过5h的、水平清晰度超过350线的高质量音视频节目。现有的DVD播放机只需简单升级固件,即可播放新标准的光盘节目。 相似文献
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通过比较DVD刻录盘、蓝光刻录盘、专业磁带、硬盘之间的优劣,结合镇江市广播电视台的实际情况,提出用蓝光刻录盘作为硬盘存储介质的补充,在编辑制作环节将需要离线保存的素材文件刻录保存到蓝光盘上,并将相关编目和索引说明编为二维码和条形码打印至光盘上,在媒资库通过扫描刻录光盘上的二维码和条形码来建立光盘检索数据库.在播出环节提出用SONY专业蓝光盘翻录电视剧来节省成本的方案. 相似文献
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KaziTakpaya 《电子科学学刊(英文版)》2003,20(6):446-450
A wireless floppy disk drive is proposed for home and office wireless local area network. The proposed floppy drive uses turbo coding-decoding in the transceiver PHYsical layer (PHY) to improve system performance. The data transmission rate is about 11 Mbps. The covered distance is 30 meters in obstructed environment and 100 m in free space. 相似文献
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The author's objective for this work was to find the least expensive motor with the best linearity and repeatability for a rotating and scanning mirror used in a hematology analyzer instrument. The design criterion was a minimal acceptable error of 3% for the worst segment length. The galvanometer and the floppy disk motor were selected as the best candidates for further testing. All testing was repeated with ten additional floppy disk motors, and similar results occurred. In addition, life testing and temperature testing were conducted again with no significant changes. A stable oscillator circuit controls the speed of the floppy disk motor. Even if the absolute motor speed changed slightly over temperature or time, as long as it stayed uniform during the scans, the calculated segment length values did not change. The floppy disk drive motor with a mirror mounted on the shaft of the motor was the best candidate. The motor's speed came close to the desired scanning speed 相似文献
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对于下一代光盘系统而言,GaN激光器和高数值孔径(NA)的物镜是关键组件。本文介绍了几种HD-DVD光学系统物镜的设计方案,并对其进行比较研究,发现要根据不同的要求来设计物镜,对像差要求高的要采用两元件型或者三元件型物镜;而对于要求结构简单、装配容易、工作距离大的光学头,要采用单元型物镜。在解决其与CD和DVD的兼容性问题时,可采用物镜前插入补偿装置来控制物镜的数值孔径。 相似文献
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The wear mechanisms of carbon coated computer hard disks with laser-textured (LT) and mechanically-textured (MT) surfaces
were characterized after contact start/stop (CSS) cyclic tests. Various analytical and mechanical testing techniques were
employed to study the changes in topography, roughness, chemical elements, mechanical properties, and friction characteristics
of the coating and lubricant. These techniques include: the atomic force microscopy (AFM), continuous nano-indentation test,
nano-scratch test, time-of-flight secondary ion mass spectroscopy (TOF-SIMS), and Auger electron spectroscopy (AES). The CSS
test at 15 k cycles resulted in tangible reductions of surface roughness of approximately 3.0 nm and 5.8 nm, respectively,
for the LT bump and MT zone. The elastic modulus and hardness values increased after the CSS test, indicating strain hardening
of the top coating layer. A critical load was identified for adhesion failure between the magnetic layer and the Ni-P layer.
The TOF-SIMS analysis also revealed reductions in the intensities of all lubricant elements, indicating wear of the lubricant
applied on the disk surface. All foregoing results confirm the usefulness of the characterization techniques employed to detect
the subtle changes in disk surface characteristics. 相似文献