Phase-insensitive all-optical transistors based on second-ordernonlinearities

We demonstrate and compare two phase-insensitive all-optical transistors (AOT's) based on frequency-degenerate quadratic three-wave interactions. In particular, we demonstrate gain using KTP in a type II geometry. Both AOT's exploit the phase insensitivity inherent to three-wave parametric processes when only two fields are input, providing amplification of a small signal at the operating frequency via the interaction with a second-harmonic wave. The first scheme is based on successive up- and down-conversion (i.e., cascading) while the second relies on parametric down-conversion. We obtain gains of 5 and 160 in the two configurations, respectively, with a significant background and output coherent to the pump in the first case, no background and coherence between output and signal in the second     

YL-100型自动加药装置在乙烯循环水场的应用

介绍了国产YL—100型自动加药装置功能及其在中国石化茂名石化乙烯工业公司乙烯循环水场的应用情况，结果表明其运行平稳，总磷测试数据可靠，可达到循环水自动加药控制的目的。     

转子叶片在非均匀来流条件下的流体激振特性

该文通过研究得出非均匀来流对转子叶片流体激振的三个重要特征 :非均匀来流相对于转子叶片的非定常流中主频分量是产生叶片动应力的决定因素 ;非均匀来流的非均匀度 (相当于非定常流的波幅 )大小和叶片流体激振的动应力大小成正比 ;转子叶片流体的定常压力水平与叶片动应力的水平密切相关。图 4表 2     

岩石工程力学特性参数测定装置设计

岩石工程力学特性参数测定装置实现了对试验载荷的恒速率加载 ,可对压模的吃深和试验载荷进行连续记录 ,记录的数据可实时显示及处理 ,且动态显示试验岩石的特性曲线 (试验载荷—轴向应变 )。该装置体积小、可移动性强 ,且能一机多用。文章详细阐述该装置机械结构、电路和系统软件的设计等     

顺坡折坡水跃方程的评述与改进

推导顺坡水跃方程的两种基本假定，实质上都是水跃区水面线直线化的处理。在这样假定基础上，本文近似地视折坡水跃为tgθ的顺坡水跃，得到了试验资料[2]的验证。     

A non—perturbation approach in temperature Green function theory

A set of differo-integral equations for many-body connected temperature Green‘s functions is established which is non-perturbative in nature and provides a reasonable truncation scheme with respect to the order of many-body correlations.The method can be applied to nuclear systems at finite temperature.     

Turbo码综合性能分析与Turbo编码调制

对 Ｔｕｒｂｏ码的 ＲＳＣ分量码、交织器、调制方式、信道以及迭代译码算法进行了综合研究与性能分析，并给出了一种基于逐比特ＭＡＰ算法的Ｔｕｒｂｏ编码与多元调制相结合的编码调制方式。仿真结果表明，该方案将Ｔｕｒｂｏ码的高编码增益与多元调制的高频谱利用率有效地结合在一起，是一种功率和频谱高效的编码调制方式，比传统的ＴＣＭ方式有更好的性能。     

A hexane solution deposition of SnS2 films from tetrabutyltin via a solvothermal route at moderate temperature

SnS₂ films have been deposited on glass and alumina plate substrates by the reactions between an organotin precursor [tetrabuyltin, (CH₂CH₂CH₂CH₃)₄Sn] and carbon disulfide in n-hexane at the temperature range 180-200 °C for 10-40 h. The reaction system was oxygen free and applied at a moderate temperature. The films so prepared were characterized by techniques of X-ray diffraction, Scanning electron microscopy, Raman and Mössbauer spectroscopies. The films deposited on glass as well as on alumina plate have an average thickness of 30 μm, but have different rose-like morphologies, which are influenced by both the anisotropic growths of crystals and the different substrate structures. Photoluminescence measurements show that the films have an emission peak at approximately 590 nm.     

Effect of storage temperature on phenolics stability in hawthorn (Crataegus pinnatifida var. major) fruits and a hawthorn drink

The stability of five major phenolics, namely (−)-epicatechin (EC), procyanidin B₂ (PC-B₂), chlorogenic acid (ChA), hyperoside (HP) and isoquercitrin (IQ), in hawthorn fruits and a canned hawthorn drink were evaluated during 6 months of storage in the dark at three different temperatures (4, 23 and 40 °C). HPLC with a diode-array detector was used to determine the contents of the individual compounds. The results showed that the studied phenolics in the hawthorn fruits and the drink were both stable at 4 °C and relatively unstable at 23 and 40 °C with varied extents of degradation. At room temperature (23 °C), marked degradations of EC and PC-B₂ were observed in both the fruits and the drink with around 50% and 30% decrease after a 6-month storage, respectively. A more significant decrease of the phenolics was observed at 40 °C, especially for EC and PC-B₂, which were almost completely degraded after a 6-month storage. HP, IQ and ChA were relatively stable at 23 °C, but unstable at 40 °C. Therefore, low-temperature storage is recommended for maintaining the quality and efficacy of hawthorn fruits and its preparations.     

储层分析中火山岩岩性的测井识别

在日益被重视的火山岩油气勘探中,由于主观和客观的原因,对火山岩油气藏的岩性存在认识不足,很大程度上限制了火山岩油气藏的勘探和开发.在分析造成这种认识不足的原因基础上,简化了储层分析中的火山岩分类方案,探讨了简化后的火山岩类型在常规测井上的响应特征.认为对火山岩岩性反映较好的常规测井曲线类型有:AC,DEN,RT(RXO,RS,COND),GR和CAL;一般由基性火山岩到酸性火山岩,表现为伽马值的增高;由火山碎屑岩到熔岩,表现为电阻率和密度的增高和声波时差的降低;在熔岩段内,测井曲线齿化代表了熔岩的破碎,反映于声波时差的增高和密度的降低及电阻率的降低.综合多个油田的实际资料,建立了火山岩的测井识别图版和标准.该分析方法和思路及提供的测井识别图版,对于火山岩油气藏的基础研究具有指导意义.