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排序方式: 共有166条查询结果,搜索用时 15 毫秒
161.
U. Hübner W. Morgenroth H.G. Meyer T. Sulzbach B. Brendel W. Mirandé 《Applied Physics A: Materials Science & Processing》2003,76(6):913-917
More and more AFMs and AFM profilers will be used to quantify micro- and nanostructures. For a correct characterization and
evaluation of the measured structural details, in the nanoscale range, knowledge of the current shape of the AFM tip is needed.
Often, the interaction between the AFM tip and the sample leads to a change in the tip shape. Our concept for the determination
of tip shapes is based on the measurement of a well-known sharp-edged silicon structure. Each calibration sample contains
a selected structure serving as a calibrated width standard, and has a certified pitch. Consequently, the shape of AFM tips
can be determined with an accuracy of 10 nm.
Received: 2 September 2002 / Accepted: 2 September 2002 / Published online: 5 March 2003
RID="*"
ID="*"Corresponding author. Fax: +49-3641/206-199, E-mail: huebner@ipht-jena.de 相似文献
162.
We consider approximation of L
p
functions by Hardy functions on subsets of the circle for . After some preliminaries on the possibility of such an approximation which are connected to recovery problems of the Carleman
type, we prove existence and uniqueness of the solution to a generalized extremal problem involving norm constraints on the
complementary subset.
December 6, 1995. Date revised: August 26, 1996. 相似文献
163.
The NIM4 caesium fountain clock has been operating stably and sub-continually since August 2003. We present our improvements on NIM4 in 2005-06 and the most recent evaluation for its frequency shifts with an uncertainty of 5 × 10^-15. A 203-day comparison between NIM4 and GPS time shows an agreement of 2 × 10^-14. Finally the construction of the NIM5 transportable caesium fountain clock is briefly reported. 相似文献
164.
R. Krishna Mohan T. Chang S. Bekker C. Ostrander C. Dollinger Z. Cole R.R. Reibel K.D. Merkel Y. Sun F. Schlottau 《Journal of luminescence》2007,127(1):116-128
This paper outlines the efforts to develop an ultra-wideband spectrum analyzer that takes advantage of the broad spectral response and fine spectral resolution (∼25 kHz) of spatial-spectral (S2) materials. The S2 material can process the full spectrum of broadband microwave transmissions, with adjustable time apertures (down to 100 μs) and fast update rates (up to 1 kHz). A cryogenically cooled Tm:YAG crystal that operates on microwave signals modulated onto a stabilized optical carrier at 793 nm is used as the core for the spectrum analyzer. Efforts to develop novel component technologies that enhance the performance of the system and meet the application requirements are discussed, including an end-to-end device model for parameter optimization. We discuss the characterization of new ultra-wide bandwidth S2 materials. Detection and post-processing module development including the implementation of a novel spectral recovery algorithm using field programmable gate array technology (FPGA) is also discussed. 相似文献
165.
The processing of weak optical signals in spatial-spectral holographic (SSH) materials coherently inverted with optical frequency chirped pulses were investigated. Simulations and experimental studies in Tm3+:YAG were conducted to characterize the parameters of the frequency chirped laser pulse used to invert the SSH material in order to obtain high photon echo efficiency for SSH lidar processing. Collinear and angled beam geometries and single shot and accumulated processes were investigated. Echo efficiencies as high as 450% were measured, significantly higher than the typical stimulated photon echo efficiency of 10%. 相似文献
166.