二磺基苯基荧光酮光度法测定钢中微量钨

研究了二磺基苯基荧光酮（ＤＳＰＦ）与钨的显色反应条件,体系λｍａｘ＝５３０ｎｍ,ε＝１．６２×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,钨的含量在０￣１５μｇ／２５ｍＬ内符合比耳定律,方法用于钢样中钨的测定,结果满意。     

铬天青S-OP分光光度法测定碳酸镍中微量铝

在ＨＡｃ－ＮＨ４Ａｃ缓冲介质中,乳化剂ＯＰ存在下,铝与ＣＡＳ形成灵敏度很高的绿色络合物,测定波长位于６２０ｎｍ,ε６２０＝１．０９×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１。碳酸镍中Ｆｅ＾２＋对测定有干扰外,其它的杂质元素均干扰,方法具有较好的选择性。Ｆｅ＾３＋的干扰,可采用抗坏血酸还原Ｆｅ＾３＋成Ｆｅ＾２＋而消除,５ｍｇ以下Ｎｉ对无明显影响,但当Ｎｉ量大于此量时,络合物吸光度下降,产生负干扰,本法采     

Al(Ⅲ)-CAS-OP-PVA体系分光光度法测定沸石分子筛中的铝

研究了在聚乙二醇辛基苯基醚（乳化剂ＯＰ）及聚乙烯醇（ＰＶＡ）存在下铝（Ⅲ）与铬天青Ｓ（ＣＡＳ）的显色反应。在ｐＨ５．３的ＨＡｃ－ＮａＡｃ缓冲介质中，题示体系最大吸收波长λｍａｘ＝６１２ｎｍ，对比度Δλ＝１０２ｎｍ，表观摩尔吸光系数ε６１２ｎｍ＝２．８４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。铝（Ⅲ）浓度在０－０．６０μｇ／ｍＬ范围内遵守比耳定律。本法已成功地用于沸石分子筛中铝含量的测定，结果良好。该法具有稳定性高、准确度好的特点。     

LaH2分子基态（C2V,A1）的势能函数

在ＱＣＩＳＤ水平上基于相对论紧致有效势（ＲＣＥＰ：Ｒｅｌａｔｉｖｉｓｔｉｃ Ｃｏｍｐａｃｔ Ｅｆｆｅｃｔｉｖｅ Ｐｏｔｅｎ－ｔｉａｌ）方法优化出ＬａＨ２分子的基态为Ｃ２ｖ（Ｘ＾２Ａ１）构型,其〈ＨＬａＨ－１２４４°、平衡核间距Ｒｅ＝２．１９４５Ａ和离子解能Ｄｅ＝５．５９９ｅＶ,并计算出谐振频率：ｖ１＝１２１６．５２１ｃｍ＾－１、ｖ２＝１０８７．４１７ｃｍ＾－１和ｖ３＝２１５６．９５７２ｃｍ＾－１。     

在He和Ne的流动余辉中POCl3的解离动力学

本文利用流动余辉技术研究了亚稳态原子Ｈｅ（２＾３ｓ）和Ｎｅ（＾３ｐ０．２）与ＰＯＣｌ３分子的传能反应，获得了激发态碎片ＰＯ（Ａ）和ＰＯ（Ｂ）的发射光谱，测定了Ｈｅ（２＾３ｓ）与ＰＯＣｌ３反应中ＰＯ（Ａ）和ＰＯ（Ｂ）的形成速率常数，其数值分别为：ＫＰＯ（Ａ）＝３．６８×１０＾－１１ｃｍ＾３·ｍｏｌｅｃｕｌｅ＾－１Ｓ＾－１和ＫＰＯ（Ｂ）＝９．４０×１０＾－１１ｃｍ＾３·ｍｏｌｅｃｕｌｅ＾－１·Ｓ＾－１     

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。     

Na（4D）＋Na（3S）=Na（4F）＋Na（3S）碰撞能量转移截面

利用双光子吸收，将Ｎａ（３Ｓ）原子激发到４Ｄ态，测量了Ｎａ（４Ｄ）＋Ｎａ（３Ｓ）＝Ｎａ（４Ｆ）＋Ｎａ（３Ｓ）碰撞能量转移截面，因为直接由４Ｆ→３Ｄ的荧光不能探测，所以检测３Ｄ→３Ｐ级联荧光讯号。结合基态钠原子密度的测量，给出了截面值σ４Ｄ→４Ｆ－１．３×１０＾－１４±２８％（ｃｍ＾２）。     

析相光度法测定铁(Ⅲ)的研究

本研究了铁（Ⅲ）－ＰＥＧ（聚乙二醇－２０００）－铬锖Ｒ－Ｎａ２ＳＯ４体系的上光度法并应用于测定Ｆｅ（Ⅲ）。最适酸并为４．５￣６．５（ＮａＡｃ－ＨＡｃ）缓冲溶液,其络合物的最大吸收位于５６０ｎｍ,表观摩尔吸光系数为５．３６×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,Ｆｅ（Ⅲ）浓度在０￣４μｇ范围内服从比尔定律,铁与铬菁Ｒ形成组成为１：２的稳定络合物。该方法用于蔡叶中铁的测定,获得了满意的结果。     

邻羧基苯基荧光酮与碲显色反应的研究及应用

在ｐＨ＝４．５ＨＡｃ－ＮａＡｃ缓冲介质中,ＣＴＭＡＢ存在下,邻羧基苯基荧光酮（ｏ－ＣＰＦ）和Ｔｅ（Ⅳ）生成４∶１稳定络合物,λｍａｘ＝５６０ｎｍ,ε＝１．２５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｔｅ（Ⅳ）含量在０—１０μｇ／２５ｍＬ内符合比耳定律,方法用于烟尘中碲的测定,结果令人满意。     

CO（a）与CS2和CS传能反应中激发态碎片形成速率

本文利用流动余辉技术研究了亚稳态ＣＯ（ａ）与ＣＳ２和ＣＳ的传能反应，测定了反应产生的激发态碎片ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数。ＣＯ（ａ）与ＣＳ２传能反应中ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数分别为３．４６×１０＾－１１ｃｍ＾３·ｍｏｌｅｃ＾－１·ｓｅｃ＾－１和１．１４×１０＾－１０ｃｍ＾３·ｍｏｌｅｃ＾－１·ｓｅｃ＾－１。ＣＯ（ａ）与ＣＳ传能反应中ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数分别为１     

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.