Results 111 to 120 of about 6,379 (165)
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AIP Conference Proceedings, 1991
Images of DNA obtained in a scanning tunneling microscope operating under ultra‐high vacuum are described, and a contrast mechanism for STM imaging of weakly‐bound adsorbates is proposed. The capability of the STM for atom‐scale imaging of DNA is demonstrated through comparison of STM data with the accepted structure of A‐DNA derived from x‐ray ...
M. G. Youngquist +4 more
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Images of DNA obtained in a scanning tunneling microscope operating under ultra‐high vacuum are described, and a contrast mechanism for STM imaging of weakly‐bound adsorbates is proposed. The capability of the STM for atom‐scale imaging of DNA is demonstrated through comparison of STM data with the accepted structure of A‐DNA derived from x‐ray ...
M. G. Youngquist +4 more
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UHV pumping equipment and the expanding field of UHV activity
Vacuum, 1990Abstract There are a growing number of industrial applications that require processing in a clean environment at pressures in the range 10−9−10−11 mbar. The important design parameters for such systems, imposed by their production environment, are (1) time, (2) value of workload, (3) overall reliability and (4) operator competence, and these in turn ...
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Ultramicroscopy, 1991
Results are reported using UHV electron microscopy to determine the role of background gases in influencing surface damage experiments and on the gold (001) surface prepared by ion-beam cleaning/thinning and annealing. In maximum valence oxides the end product is a higher-symmetry oxide or metal in UHV, but in a non-UHV environment secondary reactions ...
R. Ai +5 more
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Results are reported using UHV electron microscopy to determine the role of background gases in influencing surface damage experiments and on the gold (001) surface prepared by ion-beam cleaning/thinning and annealing. In maximum valence oxides the end product is a higher-symmetry oxide or metal in UHV, but in a non-UHV environment secondary reactions ...
R. Ai +5 more
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Proceedings, annual meeting, Electron Microscopy Society of America, 1990
Since Binnig, Rohrer and associates observed real-space topographic images of Si(111)-7×7 and invented the scanning tunneling microscope (STM),1) the STM has been accepted as a powerful surface science instrument.Recently, many application areas for the STM have been opened up, such as atomic force microscopy (AFM), magnetic force microscopy (MFM) and ...
M. Iwatsuki, S. Kitamura, A. Mogami
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Since Binnig, Rohrer and associates observed real-space topographic images of Si(111)-7×7 and invented the scanning tunneling microscope (STM),1) the STM has been accepted as a powerful surface science instrument.Recently, many application areas for the STM have been opened up, such as atomic force microscopy (AFM), magnetic force microscopy (MFM) and ...
M. Iwatsuki, S. Kitamura, A. Mogami
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LEEM and UHV-PEEM: A retrospective
Ultramicroscopy, 2012The evolution of LEEM and the later extension to spectroscopic PEEM, which run more or less parallel to Gertrude F. Rempfer's involvement in UV-PEEM and LEEM, are recounted with emphasis on instrumentation.
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Construction of a UHV scanning tunneling microscope
IBM Journal of Research and Development, 1986Conception et performances de l'instrument. Resultats obtenus sur Si(111).
Shirley Chiang, Robert J. Wilson
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In-Situ UHV Electromigration In Cu Films
MRS Proceedings, 1996AbstractCopper stripes, current stressed under UHV, clean surface conditions, have an activation energy Q for electromigration (EM) of 0.5 eV, significantly lower than the 0.8 eV reported when the surface has been exposed to air. Application of positive or negative potentials to the stripes during EM testing raises or lowers the clean surface Q in a ...
R. W. Vook, B. H. Jo
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The development of the UHV a.c. arresters
European Transactions on Electrical Power, 2011SUMMARYUltra‐high voltage (UHV) systems require good insulation and high reliability. UHV a.c. system metal‐oxide surge arrester (UHV MOA) is an important protective equipment, which used to limit the system overvoltage, to lower the level of insulation, and to increase operational reliability.
Bao‐shan Wang +5 more
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Efficiency Analysis of UHV Network
2018 China International Conference on Electricity Distribution (CICED), 2018Considering the safety and stability level of power grid, energy supply and energy saving and emission reduction, a method of efficiency analysis of UHV network is presented. In the aspect of safety and stability of power grid, this paper analyzes the level of short-circuit current of UHV network, the influence of the power flow distribution and the ...
Li Yuanyuan +8 more
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Vacuum, 2009
Abstract Development of a high-speed pumping system for ultra high vacuum (UHV) process dose not reduce only cost and waiting time for experiment and production, but also reduces CO 2 emission that is known as one of the serious causes in the global warming problem.
Ko Yamazaki +5 more
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Abstract Development of a high-speed pumping system for ultra high vacuum (UHV) process dose not reduce only cost and waiting time for experiment and production, but also reduces CO 2 emission that is known as one of the serious causes in the global warming problem.
Ko Yamazaki +5 more
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