Sm＿2Fe＿（17－x）Mo＿xC化合物的内禀磁性和MOssbauer研究

对Ｓｍ＿２Ｆｅ＿（１７－ｘ）Ｍｏ＿ｘＣ化合物的磁性和Ｍｏｓｓｂａｕｅｒ效应进行了系统的研究，少量Ｍｏ对Ｆｅ的有序替代，导致化合物的居里温度稍有增加，磁晶各问异性和内禀矫顽力明显增强，并且都在Ｍｏ浓度在ｘ＝０．６附近出现峰值，Ｍｏｓｓｂａｕｅｒ谱分析表明，化合物内禀性质的变化与Ｍｏ原子择优占居结构中的１８ｈ晶位有关。     

[Mo3S7]分子簇和聚合簇合物的振动光谱和电子光谱

本文报道了分立簇「Ｍｏ３Ｓ７（ｄｔｐ）３Ｉ」１及它的四聚物｛「Ｍｏ３ＳＵ（ｄｔｐ）３」４Ｉ｝．｛（ＨｇＩ３）４．Ｋ｝２（ｄｔｐ＝Ｓ２Ｐ（ＯＣ２Ｈ５）＾－２的ＩＲ,Ｒａｍａｎ和ＵＶ－Ｖｉｓ光谱,并讨论分立的「Ｍｏ３Ｓ７（ｄｔｐ）３Ｉ」在四聚后这些光谱的变化。     

含MoFe3S4单元的μ2-OR或μ2-SR桥联双类立方烷簇合物的红外光谱研究

对下列含ＭｏＦｅ３Ｓ４ 单元的μ２－ＯＲ或μ２ －ＳＲ桥联双类立方烷簇合物的红外光谱进行了研究：（Ｅｔ４ Ｎ）３［Ｍｏ２Ｆｅ６ Ｓ８Ｃｌ６ （ＯＭｅ）３ ］（１）,（Ｅｔ４ Ｎ）３ ［Ｍｏ２ Ｆｅ６ Ｓ８ （ＳＰｈ）６ （ＯＭｅ）３ ］（２）,（Ｂｕ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＰｈ）６ （ＯＭｅ）３ ］（３）,（Ｅｔ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＢｕｔ）６（ＯＭｅ）３］（４）,（Ｅｔ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＰｈ）９ ］（５）。通过这系列簇合物特征振动频率和结构参数及与线型Ｍｏ－Ｆｅ－Ｓ簇合物红外光谱的比较,对其νＭ ｏ－μ２Ｏ（Ｒ） ,νＭ ｏ－μ２Ｓ（Ｒ）,νＭ ｏ－Ｓ,νＦｅ－Ｓ,νＦｅ－ＳＲ,νＦｅ－Ｃｌ 进行了归属。对其中两条途径的亲电诱导效应及Δν（即νＭ ｏ－Ｓ－νＦｅ－Ｓ）与Ｆｅ→Ｍｏ 电荷迁移的关系进行了探讨。最后,讨论了桥联双类立方烷与线型Ｍｏ－Ｆｅ－Ｓ簇合物红外光谱的共性和差异。     

系列异金属类立方烷原子族化合物的振动光谱

通过振动光谱和Ｘ－射线结构分析数据的结合,归属了系列具有「Ｍ３ＹＳ３Ｍ′」（Ｍ＝Ｍｏ,Ｗ;Ｙ＝Ｏ,Ｓ;Ｍ′＝Ｃｕ,Ｓｎ,Ｓｂ,Ｐｂ,Ｂｉ）簇芯的异金属四核类立方烷原子簇化合物的主要振动谱峰。讨论了五种结构类型的光谱特征和成键状态,Ｍ′的加入使ｖＭ－（μ３－Ｙ）和ＶＭ－ｓ频率下降。当Ｍ′为过渡金属,例如Ｃｕ时,Ｃｊ与「Ｍ３ＹＳ３」结合紧密造成了Ｃｕ－Ｓ共价键相当的ｖＣｕ－ｓ振动频率,而当Ｍ′为主族金属时,ＶＭ′－ｓ远小于相应共价键的振动频率值。文中还对ｖＭ－Ｍ振动进行若干论述。     

二元羧酸取代的三核钼原子簇化合物的红外光谱与结构

本文考察了新合成的两个二元羧酸取代的三核钼衍生物Ｍｏ３Ｓ４（ＤＴＰ）３（ｐｈｔｈａｌａｔｅ）（Ｐｙ）（Ａ）（ＤＴＰ＝ｄｉｅｔｈｙｌ ｄｉｔｈｉｏｐｈｏｓｐｈａｔｅ,「Ｓ２Ｐ（ＯＥｔ）２」＾－）和Ｍｏ３Ｓ４（ＤＴＰ）３（ｍａｌｏｎａｔｅ）（Ｐｙ）（Ｂ）的红外吸收光谱,对Ｍｏ－Ｓ键及配体的主要吸收峰进行了归属和讨论,并与化合物Ｍｏ３Ｓ４（ＤＴＰ）４（Ｐｙ）（Ｃ）的谱图进行了比较。结果表明,通过对这类复     

2：17型结构Gd—Fe—Co—Ga化合物的结构与磁性

用电弧熔炼的方法制备了Ｇｄ２（Ｆｅ１－ｘＣｏｘ）１５Ｇａ２（０≤ｘ≤１０）和Ｇｄ２（Ｆｅ０８Ｃｏ０２）１７－ｙＧａｙ（０≤ｙ≤８）化合物，通过Ｘ射线衍射和磁性测量手段研究了它们的结构和磁性．实验结果表明它们都是２∶１７型结构的单相化合物．Ｇｄ２（Ｆｅ１－ｘＣｏｘ）１５Ｇａ２的单胞体积Ｖ随Ｃｏ含量的增加单调下降，而居里温度ＴＣ单调上升，１５Ｋ下的饱和磁化强度Ｍｓ随Ｃｏ含量的增加开始时略有增大，在ｘ＝０２时出现极大值，然后单调下降；对Ｇｄ２（Ｆｅ０８Ｃｏ０２）１７－ｙＧａｙ的样品，随Ｇａ含量的增加单胞体积增加，居里温度和饱和磁化强度单调下降．用Ｃｏ替代Ｆｅ，或用Ｇａ替代Ｆｅ和Ｃｏ都能导致Ｆｅ或Ｃｏ次晶格出现室温单轴各向异性，这可能与Ｇａ原子的择优占位有关．     

高TcBOLOMETER

章给出了高Ｔｃ超导红外探测器的理论分析；器件设计。并报道了用ＧｄＢａ２Ｃｕ３Ｏ７－ｘ薄膜制备的红外探测器的实验结果。得到的最好结果是噪声等效功率ＮＥＰ（５００，１０，１）＝１．４×１０＾－１１ＷＨｚ＾－１／２；探测率Ｄ＾＊（５００，１０，１）４．２×１０＾９ｃｍＨｚ＾１／２Ｗ＾－１；响应度Ｒｖ＝１０６５Ｖ／Ｗ。     

具有Keggin结构的多元杂多化合物的合成与光谱研究Ⅱ

本文合成了一些具有Keggin结构的Si-V-Mo-W四元杂多阴离子[SiVxMoyW12-x-6O40]^(4 x)-的化合物（其中，x=1,2和3），并对其进行了红外光谱研究，可看到化合物的M＝Od，M－Ob-M和M－Oc－M的红外伸缩振动峰随着V原子数目的增加而红移；而钨原子数目的增加一般使之蓝移，因此推测出杂多化合物的酸性随着V数目的增加而减, 应性能则相反。这种变化规律与[PVxMoyW12-x-yo40]^(3 x)-相似。另外，可看到P系列的多元杂多酸（或杂多化合物）的配性大于相应的Si系列的酸性。     

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     

用同位素替代方法识别化合物ABPO_5(A=Ca,Sr,Ba)的内振动模

用同位素替代方法识别化合物ＡＢＰＯ５（Ａ＝Ｃａ，Ｓｒ，Ｂａ）的内振动模张昊施颖朱恪刘玉龙刘竟青赵铁男梁敬魁（中国科学院物理研究所北京１０００８０）ＶｉｂｒａｔｉｏｎａｌＳｐｅｃｔｒｏｓｃｏｐｙＳｔｕｄｉｅｓｏｆＩｎｔｅｒｎａｌＭｏｄｅｓｏｆＳｔｉｌｗ...     

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.