MOCVD法在金属基体上制备YBCO超导带

本报道了用ＭＯＣＶＤ静态和动态沉积两种工艺制备ＹＢＣＯ超导带的实验结果。以Ｙ（ＴＭＨＤ）３、Ｂａ（ＴＭＨＤ）２和Ｃｕ（ＴＭＨＤ）２为挥发源，Ｏ２气为反应剂，高纯Ａｒ气为载流气体，在静止和以１０－１５ｃｍ／ｈ带速移动的金属银基体上，制出了有强烈ｃ－轴取向的ＹＢＣＯ超导带。静态沉积样品的Ｊｃ达到１．０４×１０＾４Ａ／ｃｍ＾２，动态沉积样品的Ｊｃ达到１．４×１０＾４Ａ／ｃｍ＾２（７８Ｋ，０Ｔ）。对改…     

二安替比林—（邻—乙氧基）苯基甲烷褪色光度法测定微量铜的研究

合成了新试剂二安替比林－（邻－乙氧基）苯基甲烷（ＤＡｏＥＭ），根据Ｃｕ＾２＋对Ｈ３ＰＯ４－Ｍｎ（Ⅱ）－Ｃｒ（Ⅵ）－ＤＡｏＥＭ显色体系的干扰褪色作用，建立了一个测定微量铜的新方法，其检出限为４×１０＾－６ｇ／Ｌ，铜离子含量在２０－１６０μｇ／Ｌ范围内与１ｇ（Ａ０／Ａ）成良好线性关系，体系稳定性和选择性良好，用于铅样中痕量铜的测定，结果满意。     

5-(H-酸偶氮)-8-氨基喹啉与铜显色反应研究及在烟草分析中的应用

本文研究了５－（Ｈ－酸偶氮）－８氨基喹啉（ＨＡＱ）与铜的显色反应,在ＰＨ＝４．２ＨＡｃ－ＮａＡｃ缓冲介质中,有乳化剂－ＯＰ存在下,ＨＡＱ与铜反应生成稳定的２：１络合物,λｍａｘ＝５５０ｎｍ,ε＝４．８７＊１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。铜含量在０－１６μｇ／２５ｍＬ范围内符合比耳定律,方法用于烟草样品中铜含量的测定,结果令人满意。     

四氯合铜酸苯铵盐的结构及其红外与拉曼光谱研究

制备了四氯四铜酸苯铵盐（Ｃ６Ｈ５ＮＨ３）２ＣｕＣｌ４单晶，Ｍｒ＝１８７．２６，由四园衍射数据确定了晶体结构，晶体属单斜晶系，空间群Ｐ２１／ａ，ａ＝０．７１８４（１），ｂ＝０．７４４８（２），ｃ＝１．５０７０（４）ｎｍ，β＝１００．６７（２）°，Ｖ＝０．７９２４ｎｍ＾３，Ｚ＝２，Ｄｘ＝１．６５０ｇｃｍ＾－３，（Ｍｏ，Ｋａ）＝０．０７１０６９ｎｍ，μ＝４．０５６ｍｍ＾－１，Ｆ（０００）＝３８９，Ｒ＝０     

Fe-CAS-NH4F-OP体系高灵敏度分光光度法测定二氧化硅中微量铁

在ＨＡｃ－ＮＨ４Ａｃ缓冲介质中,当有ＮＨ４Ｆ和乳化剂ＯＰ存在时,Ｆｅ与ＣＡＳ形成络合比为１：３的有色络合物,其最大吸收波长位于６５４．０ｎｍ,表观摩尔吸光系数为１．１８×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,１－２０μｇ Ｆｅ／５０ｍＬ线性关系良好。该法用于二氧化硅中铁的测定,结果令人满意。     

二溴邻羧基苯基重氮氨基偶氮苯光度法测定微量Cu（Ⅱ）的研究

本文报道了新显色剂二溴邻羧基苯基重氮氨基偶氮苯（ＤＢ－Ｏ－ＣＤＡＡ）与铜（Ⅱ）的显色反应及分析应用，研究结果表明，在ＴｒｔｉｏｎＸ－１００的存在下，于ｐＨ１０．０的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲介质中，Ｃｕ（Ⅱ）与试剂形成１：２的红色配合物，配合物λｍａｘ＝５３０ｎｍ，表观摩尔吸光系数为１．０８×１０＾５Ｌ／ｍｏｌ．ｃｍ，铜量在０－０．３２μｇ／ｍＬ，范围内遵循比尔定律，方法用于合金及合成水样中微量     

铜与2-羟基-3-羧基-5-磺酸基苯重氮氨基偶氮苯反应的分光光度法研究及应用

研究了铜与２－羟基－３－羧基－５－磺酸基苯重氮氨基偶氮苯（ＨＣＳＤＡＡ）的显色反应。在Ｔｒｉ－ｔｏｎＮ－１０１存在下和ｐＨ１０．４～１１．５的缓冲介质中，Ｃｕ２＋与ＨＣＳＤＡＡ形成１∶２的红色配合物，其最大吸收波长是５３０ｎｍ，对比度为１０２ｎｍ，表观摩尔吸光系数为１．３１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。铜在０～０．２４μｇ／ｍＬ范围内服从比尔定律。用于铅锌矿和花生中微量铜的测定，相对误差不大于３．７％，相对标准偏差不大于１．６％（ｎ＝６）。     

双水相体系中Cu(Ⅱ)的显色反应研究

本文研究了铬黑Ｔ（ＥＢＴ）作萃取剂和显色剂,在聚乙二醇－２０００（ＰＥＧ）－Ｎａ２ＳＯ４－ＥＢＴ双水相体系中Ｃｕ（Ⅱ）的显色反应条件及应用,实验结果表明,在ｐＨ８．５缓冲溶液中,将Ｃｕ（Ⅱ）络合物从水溶液中萃取到ＰＥＧ相,其最大吸收波长位于５６０ｎｍ,摩尔吸光系数为３．０５×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,此法用于铝合金中铜的测定,获得了满意结果。     

新试剂5—（2,4—二甲苯偶氮）—罗丹宁与银的显色反应的研究及应用

新试剂５－（２，４－二甲苯偶氮）－罗丹宁，在ｐＨ７．０５的ＮＨ４ＡＣ缓冲液中，当有非离子表面活性剂ＴｒｉｔｏｎＸ－１００存在时，银可与试剂形成１：１的络合物，其络合物的最大吸收波长位５２０ｎｍ，表观摩尔吸光系数εｏ ９．６×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ａｇ量在０－１０μｇ／２５ｍＬ范围内遵循比耳定律，所拟方法用于工业废水中微量银的测定，结果满意。     

Tl—1223超导体及其复Ag带的制备

研究了用产中分熔化法制备Ｔｌ－１２２３超导体的工艺。样品的名义组成为（Ｔｌ０．５Ｐｂ０．５）（Ｓｒ０．８Ｂａ０．２）Ｃａ２Ｃｕ３Ｏｙ。经熔化退火的样品，其磁化电流的７７Ｋ和１Ｔ下大于２×１０＾４／ｃｍ＾２。用熔化－退火的超导粉作原料制得的复Ａｇ带短样，Ｊｃ达１．６－１．７×１０＾４Ａ／ｃｍ＾２（７７ｋ，０Ｔ）。采用烧结后的超导粉作原料，在制备复Ａｇ带的工艺中，如用熔化－退火的热处理制度，可以免除…     

Self-organization of five species in a cyclic competition game

Cyclic competition game models, particularly the “rock–paper–scissors” model, play important roles in exploring the problem of multi-species coexistence in spatially ecological systems. We propose an extended “rock–paper–scissors” game to model cyclic interactions among five species, and find that two of the five can coexistent when biodiversity disappears, which is different from the “rock–paper–scissors” game. As the number of fingers is five, we named the new model the “fingers” game, where the thumb, forefinger, middle finger, ring finger, and little finger cyclically dominate their subsequent species and are dominated by their former species. We investigate the “fingers” model in two ways: direct simulations and nonlinear partial differential equations. An important finding is that the number of species in a cyclic competition game has an influence on the emergence of biodiversity. To be specific, the “rock–paper–scissors” model is in favor of maintaining biodiversity in comparison with the “fingers” model when the variables (population size, reproduction rate, selection rate, and migration rate) are the same. It is also shown that the mobility and reproduction rate can promote or jeopardize biodiversity.     

Contrastive analysis on tone between Putonghua and Taiwan Mandarin

The differences of the pitch and duration of Chinese syllables between Putonghua （PTH） and Taiwan Mandarin （TM） were studied. The speech materials to be used are not only isolated syllables, but also sentences. The results reveal that： For the isolated syllables, T1 and T2 in TM are influenced by Minnan dialect, therefore their pitch are lower than those in PTH. T3 is fall-rise in PTH, while it is fall in TM. Moreover, the syllable duration sequence for different tone is T3〉T2〉T1〉T4 in PTH, while it is T1〉T2〉T3〉T4 in TM. For the syllables in sentences, T2 is mid-rise in PTH, while it is mid-level in TM. And the T3 is longer than T4 but shorter than T1 or T2 in PTH, while it is the shortest in TM. Furthermore the effects of prosodic phrase boundary on duration for different tones are almost the same in PTH, but the lengthening part of T1 or T2 is longer than that of T3 or T4 in TM.     

Experimental study on downstep in Chinese intonation

Downstep in pitch contour of Chinese Putonghua is examined using subtly designed sentences by controlling tone combinations. The results show both automatic and nonautomatic downstep phenomena exist in Chinese. In non-automatic downstep, low tones compress downwards the pitch range of the following syllables. and the main influence of downstep is on topline. Low tone not only lower the topline behind it, but also raise the high tones before it, the effects are compatible with each other. In automatic downstep, the topline of pitch contour in intonational phrase is presented as a linear downtrend, but it differs among speakers due to the effect of personal stress practice. In comparison with downstep phenomenon in other tone or non-tone languages, the downstep ratio in Chinese is not constant, and the domain of downstep is not limited within the adjacent tones.     

Abelian-Higgs phase of SU(2) QCD and glueball energy

It is shown that SU(2) QCD admits an dual Abelian-Higgs phase, with a Higgs vacuum of a type-Ⅱ superconductor. This is done by using a connection decomposition for the gluon field and the random-direction approximation. Using a bag picture with soft wall, we presented a calculational procedure for the glueball energy based on the recent proof for wall-vortices [Nucl. Phys. B 741(2006)1].     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Signal generation in an isotropic medium in scanning electron acoustic microscope

Based on the research in Ref. [5][Materials Science and Engineering, 1989; A122： 57 63], an improved model of heat source is set up, the different modes of Lamb wave in an isotropic sample generated by a chopped electron beam at frequency f are obtained with integral transform and normal function expansion method, and the output signal of PZT coupled at the back surface of the sample is found out. The generation mechanism of SEAM （Scanning Electron Acoustic Microscopy） signal is discussed. It shows that the SEAM is a near field imaging technique with high spatial resolution and its best lateral spatial resolution is about 2√2α （α is the radius of the focused electron beam）. Some of experimental results of SEAM images are presented in the paper and it shows that the spatial resolution of SEAM is better than 0.5 μm and smaller than the thermal diffusion length of the sample. Therefore the character of near field imaging in SEAM is also proved experimentally.     

High efficiency filtering using two-dimensional photonic crystal coupled cavity structures

Transmission spectra of coupled cavity structures (CCSs) in two-dimensional (2D) photonic crystals (PCs) are investigated using a coupled mode theory, and an optical filter based on CCS is proposed. The performance of the filter is investigated using finite-difference time-domain (FDTD) method, and the results show that within a very short coupling distance of about 3λ, where λ is the wavelength of signal in vacuum, the incident signals with different frequencies are separated into different channels with a contrast ratio of 20 dB. The advantages of this kind of filter are small size and easily tunable operation frequencies.