超大规模集成电路硅片溶液清洗技术的进展

本文综述了超大规模集成电路制造过程中硅片溶液清洗技术的研究历史及现状, 并对技术的未来发展进行了展望。     

Thermal and Spectral Behaviour of 5-chloro-2-methoxybenzoates of Heavy Lanthanides and Yttrium

5-Chloro-2-methoxybenzoates of heavy lanthanides and yttrium were obtained as di- or tetrahydrates with a metal to ligand ratio of 1:3 and general formula: Ln(C₈H₆ClO₃)₃⋅nH₂O, where n=2 for Ln=Tb, Dy, Y and n=4 for Ln=Ho, Er, Tm, Yb, Lu. The complexes were characterized by elemental analysis, IR and FIR spectra, thermogravimetric studies, X-ray diffraction and magnetic measurements. The carboxylate group appears to be a symmetrical, bidentate, chelating ligand. All complexes are polycrystalline compounds. Their thermal stabilities were determined in air and in nitrogen atmospheres. When heated they dehydrate to form anhydrous salts which next in air are decomposed to the oxides of the respective metals while in nitrogen to the mixtures of carbon and oxides or carbon and oxychlorides of respective metals. The complexes are more stable in air than in nitrogen. The solubilities of yttrium and heavy lanthanide 5-chloro-2-methoxybenzoates in water at 293 K are of the order of 10^–3 mol dm^–3 The magnetic moments of the complexes were determined over the range 77–298 K. They obey the Curie–Weiss law. The values of μ_eff calculated for all compounds are close to those obtained for Ln³⁺ by Hund and Van Vleck. The results indicate that there is no influence of the ligand field of 4f electrons on lanthanide ions and the metal ligand bonding is mainly electrostatic in nature. This revised version was published online in August 2006 with corrections to the Cover Date.     

具有缓冲功能的三值 GaAs电路的研究

本文探讨了具有缓冲功能的三值 GaAs电路的基本结构 ,特别是对三值 GaAs逻辑输出级电路 进行了讨论 ,提出了 2种三值 GaAs电路的逻辑级电路的结构 ,经过 PSPICE程序的模拟 ,选取了较理想 的一种电路结构 ,并由此建立了对应的开关模型. 根据该模型提出了适用于三值 GaAs在开关元件级的 电路设计方法 .     

Rainbow trapping based on long-range plasmonic Bragg gratings at telecom frequencies

The group velocity of long-range surface plasmon polaritons (LRSPPs) in a wide frequency bandwidth at infrared frequencies is significantly reduced by dielectric gratings of graded thickness on both sides of a thin metal film. This structure can reduce the propagation loss of slow surface plasmons in rainbow trapping systems based on plasmonic Bragg gratings. Compared with dielectric gratings of graded thickness on a single side of a metal film, the proposed structure is able to guide slow light with a much longer propagation distance for the same group index factor. Finite- difference time-domain simulation results show that slow LRSPPs with the group velocity of c/14.5 and the propagation distance of 10.4 μm are achieved in dielectric gratings of uniform thickness on both sides of a thin metal film at 1.62 μm.     

New Criterion for Designing Silica Multimode Interference Power Splitters

We introduce a new criterion for designing 1 × N silica multimode interference power splitters using overlapping-image multimode interference analysis. This criterion requires that widths of multimode waveguides in the devices should be greater than 2 times the product of port number N and effective widths of output waveguides. Better device uniformity can be achieved when the new criterion is satisfied.     

An investigation of coupled-cavity diode lasers

In this paper, the rate equations of coupled-cavity diode lasers are studied and their improvements in the case of strong coupling are presented, and therefore, the mechanism of single-mode oscillation of the devices is discussed.     

逻辑函数修改技术在任意进制同步计数器综合中的应用

本文将逻辑函数修改技术川用于任意进制同步计数器的综合 , 从而导出了任 意 进 制 同步加法计数器、减法计数器和可逆计数器使用 T 型触发器的设计公式.在此基础上提出了使用 J一K 触发器设计任意进制同步加法计数器、减法计数器和可逆计数器的方法.通过实例表明,公式设计法具有使用方便、设计迅速等优点和~一定的实用意义     

On the Chaotic Behavior of a Third-Order Log-Domain Filter

Operation of log-domain filters revolves around the large-signal forward-active mode exponential current-voltage relationship of the bipolar junction transistor, which is used to map the input currents to the logarithmic domain, where the analog processing takes place, and to convert the filtered voltage waveforms back to the linear domain. Sometimes, the inherent internal nonlinearity of such circuits is the cause of unwanted externally-nonlinear effects. In this paper a differential third-order log-domain Chebyshev low-pass filter is designed by applying the method of operational simulation of doubly-terminated LC ladders. When the six grounded shunt capacitors of this filter are properly replaced with three half-sized floating capacitors, as is common practice in internally-linear fully-differential capacitively-loaded circuits, under particular conditions the resulting system exhibits limit-cycle oscillations, period-doubling bifurcations and chaotic behavior for zero-input. The presence of chaos is confirmed by extracting the spectrum of Lyapunov exponents of the system from the time series of the output voltage.     

Circuits through prescribed vertices in k‐connected k‐regular graphs

We show that every set of vertices in a k‐connected k‐regular graph belongs to some circuit. © 2002 John Wiley & Sons, Inc. J Graph Theory 39: 145–163, 2002     

4 MV同轴-三平板型水介质自击穿开关的电路模拟与实验

在PTS单路样机上进行了4 MV水介质同轴-三平板型水介质自击穿开关实验研究,开关由3个线性排列的球-板结构的电极间隙构成。根据PTS单路样机部件组成及其结构,建立了单路样机Pspice全电路模型及开关等效电路。给出了开关在自击穿电压3.3 MV和2.9 MV状态下的电路模拟与实验对比,模拟结果与实验结果一致。实验及模拟结果表明,装置和开关模型与参数选取及设置合理,水介质自击穿开关的参数与实际值相近。