安替比林偶氮-Ⅲ分光光度法测定粗铅中的铜

研究了安替比林偶氮 - 与铜的显色反应 ,在 p H为 11的缓冲介质中 ,铜与试剂反应生成 1∶ 1稳定络合物 ,λmax=5 90 nm,体系 ε=5 .16× 10 4L·mol-1·cm-1。铜含量在 0— 30 μg/ 2 5 m L范围内符合比耳定律 ,本方法可用于粗铅中铜含量的测定。     

2-[(5-溴-2-吡啶)-偶氮]-5-二乙氨基苯酚分光光度法测定岩石中微量铌

在酒石酸介质中 ,铌 (V)与 5- Br- PADAP生成兰紫色的三元络合物 ,最大吸收波长为 6 0 0 nm,络合物的表观摩尔吸光系数为 5.7× 10 4 L·mol-1· cm-1,Nb2 O5含量在 0— 2 0 μg/2 5m L范围内符合比耳定律。有色络合物稳定 3天以上。本法简便 ,快速 ,用于岩石中微量铌的测定 ,结果令人满意。     

新显色剂4-BPA-TB测定钢铁中铋的含量

本文研究了华东师大新合成的显色剂 4- BPA- TB(俗称三溴偶氮膦 )与 Bi3+的显色反应。在 HCl O4和乙醇介质中试剂与 Bi3+生成蓝色的络合物 ,其最大吸收波长位于 6 4 4 nm。新显剂的最大吸收波长位于5 47nm,摩尔吸收系数 4.4× 1 0 4 L· mol- 1 · cm- 1 。Bi3+的含量在 5— 40 μg/2 5 m L 范围内符合比耳定律。用新显色剂测定了钢铁中的铋、结果令人满意。     

锌-苯基荧光酮-CTMAB体系条件研究及应用

研究了在 p H8.0的硼酸 -硼砂缓冲溶液中 ,有 CTMAB存在下 ,锌与 PF的显色反应。锌与 PF生成的红色络合物 ,最大吸收波长为 5 70 nm,表观摩尔吸光系数为 4 .90× 10 4 L·mol-1·cm-1,测得络合物的组成比 Zn( )∶ PF=1∶ 1。锌含量在 0— 2 0μg/ 2 5 m L之间符合比耳定律。有色络合物稳定 2 4 h以上 ,应用于矿石中微量锌的测定 ,获得了满意的结果     

对硝基酚荷移分光光度法测定甲氧苄啶的含量

在水溶液中甲氧苄啶与对硝基酚发生反应生成 1∶ 1的荷移络合物。络合物最大吸收波长 4 0 2 .4 nm,线性范围 2— 2 5 μg/ m L,表观摩尔吸光系数为 ε=8.4 6 8× 10 3 L· mol-1· cm-1,回收率为99.6 7%— 10 0 .4 % ,相对标准偏差为 1.3% (n=5 )。本法测定甲氧苄啶药物制剂含量 ,结果令人满意。     

氯磺酚偶氮硫代若丹宁光度法测定铂

本文研究了氯磺酚偶氮硫代若丹宁 (HSCT)与铂的显色反应 ,在盐酸介质中 ,HSCT与铂反应生成 2∶ 1稳定络合物 ,λmax=5 3 5 nm,ε=6.2 4× 1 0 4 L· mol-1· cm-1。铂含量在 0— 5 0 μg/2 5 m L范围内符合比耳定律 ,方法用于催化剂中铂含量的测定     

微波消化-分光光度法测定铂

在盐酸介质中对氨基苯基亚甲基若丹宁 (ABR)与铂的显色反应 ,生成 2∶ 1稳定络合物 ,λmax=5 2 5 nm,ε=5 .98× 10 4L·mol-1·cm-1。铂含量在 0— 5 0 μg/ 2 5 m L范围内符合比耳定律 ,方法可用于催化剂中铂含量的测定。     

分光光度法测定环境水样中的汞

研究了氯磺酚偶氮硫代若丹宁 ( HSCT)与汞的显色反应 ,在醋酸介质中 ,HSCT与汞反应生成 2∶ 1稳定络合物 ,λmax=5 4 5 nm,ε=5 .66× 10 4 L· mol-1· cm-1。汞含量在 0— 2 .5μg/ m L范围内符合比耳定律 ,本方法可用于水样中痕量汞含量的测定     

分光光度法测定三醋酸甘油酯中的汞

研究了在 p H3.5的 HAc- Na Ac缓冲介质中 ,对氨基苯基亚甲基若丹宁 (ABR)与汞的显色反应。ABR与 Hg2 + 反应生成 2∶ 1稳定络合物 ,体系 λmax=5 35 nm,ε=4 .89× 10 4L· mol-1· cm-1。汞含量在 0—2μg/ m L范围内符合比耳定律 ,本法可用于三醋酸甘油酯中痕量汞的测定。     

分光光度法测定食品中的锗

在浓度为 1 .2 mol/ L的 HCl介质中 ,苯芴酮与锗反应生成橙红色络合物 ,λmax=5 30 nm,ε=3× 1 0 4 L· mol- 1 · cm- 1 ,锗含量在 0 .5 - 5 0μg/ 5 0 m L范围内符合比尔定律 ,本方法用于食品中锗的测定 ,结果令人满意。     

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.