一种合成孔径雷达用的光学处理器

本文介绍由三个透镜组成的对合成孔径雷达数据进行现场处理的光学处理器。它具有轻便、灵活、容易调整、适应范围大和便于装拆的特点。     

弹性支承圆弧梁内力分析

以现代桥梁及房屋结构为工程背景,提出弹性支承曲线梁计算模型,按结构力学方法推导出弹性支承圆弧梁的内力计算公式,分析讨论了竖向和抗扭弹性支承对内力的影响．     

Uses of ionic liquid 1‐butyl‐3‐methylimidazolium hexafluorophosphate as a good separation electrolyte for direct electrophoretic separation of quaternary ammonium herbicides

This paper describes a new method for the direct separation of paraquat and diquat by CZE with ionic liquid 1‐butyl‐3‐methylimidazolium hexafluorophosphate employed as reliable electrolyte. Several factors that affect the separation efficiency were investigated in detail. The experimental results indicated that the optimal running buffer consisted of 50 mM 1‐butyl‐3‐methylimidazolium hexafluorophosphate and 10% ethanol (pH 5.0), applied voltage was 15 kV, and temperature was kept at 30°C and baseline‐separation was achieved within 18 min for the analytes. The proposed method would be very useful and have wide use to monitor the residual level of such pollutants when combined with high‐sensitive detector and an excellent sample preconcentration technique with high enrichment factor in the future.     

Detectability of infrared small targets

Selecting the most appropriate algorithms for detecting small targets in varied infrared image scenes is frequently needed, since the relative characteristics between small targets and backgrounds in varied scenes are disparate. To solve that problem, a novel criterion is proposed in this article to measure the difficulty in distinguishing small targets from infrared images, which is named detectability of infrared small targets (DIST). Then a new method to detect small targets based on it was introduced. Detection probability and false alarm probability were employed to evaluate the performance. The results from the experiments further demonstrated the robustness of the proposed methodology under different backgrounds.     

甲基百里(香)酚蓝新负载树脂的特 性及应用

本文以金属指示剂甲基百里(香)酚蓝作为鳌合剂制得具有相应鳌合基团的负载树脂.研究了该树脂的某些分析特性及其在富集天然水中微量铜、钻、镍、锌中的应用.     

Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation

A series of Cr doped TiO2 films were prepared by micro arc oxidation (MAO) using an electrolyte of Na3PO4+K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3+/Cr4+ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance, while the latter generates a new gap between the conduction band (CB) and valence band (VB) of TiO2, which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.     

Frequency-Thermal Characterization of On-Chip Transformers With Patterned Ground Shields

Extensive studies on the performance of on-chip CMOS transformers with and without patterned ground shields (PGSs) at different temperatures are carried out in this paper. These transformers are fabricated using 0.18-mum RF CMOS processes and are designed to have either interleaved or center-tapped interleaved geometries, respectively, but with the same inner dimensions, metal track widths, track spacings, and silicon substrate. Based on the two-port S-parameters measured at different temperatures, all performance parameters of these transformers, such as frequency- and temperature-dependent maximum available gain (G_max), minimum noise figure (NF_min), quality factor (Q₁) of the primary or secondary coil, and power loss (P_loss) are characterized and compared. It is found that: 1) the values of the G_max and Q₁ factor usually decrease with the temperature; however, there may be reverse temperature effects on both G _max and Q₁ factor beyond certain frequency; 2) with the same geometric parameters, interleaved transformers exhibit better low-frequency performance than center-tapped interleaved transformers, whereas the center-tapped configurations possess lower values of NF_min at higher frequencies; and 3) with temperature rising, the degradation in performance of the interleaved transformers can be effectively compensated by the implementation of a PGS, while for center-tapped geometry, the shielding effectiveness of PGS on the performance improvement is ineffective     

核内核子与△粒子的散射截面

在自洽的相对论ＢＵＵ方程框架内研究了核内Ｎ（核子）△弹性和非弹性散射截面的介质效应，结果表明，在ＳＩＳ能区有效截面与Ｃｕｇｎｏｎ参数化相差很大而必须加以考虑．