电感耦合等离子体质谱法测定高钝镉中的杂质元素

采用电感耦合等离子体质谱光测定离纯镉中的杂质元素。讨论了镉基体的谱线干扰,比较了镉基体产生的多原子离子的干扰程度,该干扰按ＣｄＨ、ＣｄＯ、ＣｄＯ２、ＣｄＡｒ、ＣｄＯＨ和ＣｄＯＨ２顺序递减。研究了不同浓度镉基体对分析物信号的抑制或增强效应,镉的浓度大于０．２５ｇ·Ｌ＾－１时,对质量数小于１００的分析物的信号强度产生抑制,而以质量数大于１５０的分析的信号强度产生增强,采用＾８９Ｙ和＾２０９Ｂｉ作内标分     

ICP－AES法分析水质的探讨

本文用ＩＣＰ－ＡＥＳ（电感耦合等离子体－原子发射光谱法）测定水中Ａｌ、Ｂ、Ｂａ、Ｂｅ、Ｃａ、Ｃｄ、Ｃｏ、Ｃｒ、Ｃｕ、Ｆｅ、Ｍｇ、Ｍｏ、Ｍｎ、Ｎｉ、Ｐｂ、Ｓｒ、Ｖ、Ｚｎ等１８种微量元素。方法简便、快速，只将样品简单酸化，即可测定。方法检出限为０．０００５－０．５μｇ／ｍＬ。相对标准偏差＜１８％     

杂质对（Ce,Gd,Tb）MgB5O10灯用荧光粉发光量子效率的影响

研究了杂质对Ｃｅ０．１ｇＤ０．６ｔＢ０．２ｍＧｂ５ｏ１０发光量子效率的影响。低浓度的Ｐｒ＾３＋、Ｎｄ＾３＋、ＤＦ＾３＋、Ｈｏ＾３＋和Ｅｒ＾３＋不能有效地与Ｇｄ＾３＋和Ｔｂ＾３＋竞争Ｃｅ＾３＋离子的激发能。此外，因电子传递过程，Ｓｍ＾３＋和Ｅｕ３＋使Ｃｅ＾３＋的发光效率大大降低。     

元素在探针表面上的原子化机理研究

探针原子人经法是一种新技术，本文系统地总结了用探针原子化法研究Ａｕ（１Ｂ），Ｓｒ（ⅡＡ），Ｃｄ（ⅡＢ），Ａｌ（ⅢＡ），Ｌａ，Ｓｍ，Ｆｕ（ⅢＢ），Ｇｅ，Ｓｎ，Ｐｂ（ⅣＡ），Ｓｂ，Ｂｉ（ⅤＡ），Ｖ（ⅤＢ），Ｃｒ，Ｍｏ（ⅥＢ），Ｍｎ（ⅦＢ），Ｆｅ，Ｃｏ，Ｎｉ，Ｐｔ（Ⅷ）等２０个元素的原子化机理了起源于卤化物分解的元素有Ａｕ与Ｐｔ，起源于氧化物分解的元素有Ｃｄ，Ａｌ，Ｌａ，Ｓｍ，Ｅｕ，Ｇｅ，Ｍｎ与Ｆｅ。     

ICP—AES法测定锌及其化合物中的杂质元素

采用样品溶解后直接测定及氢氧化钇共沉淀将锌与被测杂质元素分离后测定相结合，研究了锌及其化合物中Ａｇ，Ｃｏ，Ａｌ，Ｎｉ，Ｆｅ，Ｃｕ，Ｃｄ，Ｃｒ，Ｍｎ，Ｉｎ，Ａｓ，Ｐｂ，Ｓｎ，Ｓｂ，Ｂｉ等１５个杂质元素的ＩＣＰ－ＡＥＳ测定方法，相对标准偏差１．６－８．１％。     

A Copper Laser with Flowing Ne-HBr Buffer Gas

ＡＣｏｐｐｅｒＬａｓｅｒｗｉｔｈＦｌｏｗｉｎｇＮｅ－ＨＢｒＢｕｆｆｅｒＧａｓ￥ＪＩＹｉｎｇ；ＬＩＡＮＧＰｅｉｈｕｉ；ＳＨＥＮＱｉｍｉｎ；ＺＨＡＮＧＧｕｉｙａｎ；ＬＩＮＦｕｃｈｅｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅ...     

ICP—AES法测定碲锭中A1,Ag,Bi,Cu,Cd等13个杂质元素

本文介绍了采用电感耦合等离子体发射光谱尖（ＩＣＰ－ＡＥＳ０测定碲锭中Ａ１、Ａｇ、Ｂｉ、Ｃｕ、Ｃｄ等１３个杂质元素的方法。采用离峰扣背景法校正了碲基体的干扰,测定结果令人满意。     

激波管中H2—O2爆轰产物辐射光谱的实验研究

本文采用Ｐｏｌａｒｏｉｄ６６７高速感光底片和大型石英棱镜摄谱仪，首次成功地拍摄到３０００Ａ～６４５０Ａ范围内激波管中Ｈ２－Ｏ２爆轰及杂质光谱。经识别确认出以下谱线和谱带：ＯＨ（０，０）、ＯＨ（０，１）和Ｏ２Ｓｃｈｕｍａｎｎ－Ｒｕｎｇｅ分子谱带，管壁物质及管内附积物Ｆｅ、Ｃｒ、Ｃａ、Ｍｎ、Ｍｇ、Ｎａ的原子谱线以及管壁物质和管内附积物参与化学反应的中间产物的分子谱带系ＦｅＯ（黄带系）、ＣｒＯ（红黄带系     

ICP-AES法同时测定纯铁中八种杂质元素

本文研究了用ＩＣＰ－ＡＥＳ法同时测定纯铁中８种杂质元素：Ｃｒ、Ｃｕ、Ｍｇ、Ｍｎ、Ｍｏ、Ｎｉ、Ｔｉ、Ｖ的分析方法。研究了铁基体地被测元素光谱线的光谱干扰与物理干扰,采用背景扣除法与基体匹配法进行校正。被测元素的检出限为０．４－３．０μｇ／Ｌ,合成试样的回收率为９１－１１０％,杂持元素含量为０．０００３－０．０５％时,测量的相对标准偏差〈９％,方法简便、准确、结果满意。     

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。     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Research on beamforming method for dual-line array with space mismatch between the two line arrays

The performance of port/starboard discrimination of dual-line array will be seriously degraded when the space between the two line arrays of the dual-line array is mismatched. The directivity function of the delay-sum and delay-subtract beamforming is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied both under the ideal status and the status under which the space between the two line arrays of the dual-line array is mismatched. Analysis results show the delay-subtract beamforming has better performance of port/starboard discrimination. At last, the sea trial results demonstrate the theoretical results.     

Retrieval of ultraviolet skylight radiances and O3 slant column densities from balloon-borne limb spectrometer

With a novel light-weight and absolutely calibrated ultraviolet （UV） spectrometer, UV skylight radiances and O3 slant column densities are measured by balloon-borne limb measurements in Xinjiang area, China. UV skylight radiances measured at the height of 31 km are compared with the results from Modtran in the wavelength range from 290 to 420 nm. O3 slant column densities are derived from radiance spectra in the Huggins bands （320 - 335 nm） using differential optical absorption spectroscopy method. And the parameter exhibits a good correlation with the same value simulated by radiative transfer model （Tracy）. The O3 profile simultaneously measured by an O3 sonde is used as input in Tracy calculations. The O3 sonde is launched on the same balloon.     

Design optimization of highly sensitive LSPR enhanced surface plasmon resonance biosensors with nanoholes

For breaking through the sensitivity limitation of conventional surface plasmon resonance (SPR) biosensors, novel highly sensitive SPR biosensors with Au nanoparticles and nanogratings enhancement have been proposed recently.But in practice, these structures have obvious disadvantages.In this study, a nanohole based sensitivity enhancement SPR biosensor is proposed and the influence of different structural parameters on the performance is investigated by using rigorous coupled wave analysis (RCWA).Electromagnetic field distributions around the nanohole are also given out to directly explain the performance difference for various structural parameters.The results indicate that significant sensitivity increase is associated with localized surface plasmons (LSPs) excitation mediated by nanoholes.Except to outcome the weakness of other LSP based biosensors, larger resonance angle shift, reflectance amplitude, and sharper SPR curves' width are obtained simultaneously under optimized structural parameters.     

Polymer gratings based on photopolymerization for low-order distributed feedback polymer lasers

Novel polymer distributed feedback(DFB)gratings are fabricated based on photopolymerization to reduce lasing threshold of polymer lasers.A photopolymer formulation sensitive to 355-nm ultraviolet(UV)light is proposed for the fabrication of polymer gratings and it can be used to form polymer films by spin-coating process.A very low surface-relief depth ranging from 12.5 to about 1.0 nm has been demonstrated with a refractive-index modulation of about 0.012.The experimental results indicate that such polymer gratings have promising potentials for the fabrication of low-order DFB organic semiconductor lasers.     

A novel methodology for photometric compensation of projection display on patterned screen

We propose a novel methodology based on the projector-camera (ProCam) system to address the photometric compensation issue for the projection display on the patterned screen.The patterned screen is treated as the combination of a perfect white screen and a color modulator.The perfect white screen is used to automatically and accurately characterize the ProCam system offline using the polynomial model,and the parameters of the color modulator can be efficiently recovered by employing only two gray images based on the linear reflectance model.The experimental results show that the color artifacts of the display image can be greatly improved with this methodology,which demonstrates its feasibility and validity in the photometric compensation.     

Direction-of-arrival estimation using matrix spatial prefiltering approach

An approach to direction-of-arrival （DOA） estimation for multiple narrowband farfield signals is proposed. The technique uses a novel matrix spatial prefiltering approach. Specifically, a matrix filter is designed to spatially filter the incoming data snapshots. The un-wanted components arriving from the stopband angular sectors are attenuated and the desired components from the angular sector of interest pass with minimal distortion. The matrix filter spatially filters the element-space data and the output reserves the element-space data property, which makes it very useful by passing sensor data through a spatial prefilter prior to applying many other array processors to attenuate interferences and improve system performance. Several examples of DOA estimation problem are presented to illustrate the performance of the proposed spatial prefiltering approach. Results of simulation and real data show that the pre-filter can efficiently attenuate the spatial interferences and significantly improve the estimation and resolution capability of DOA estimators at low signal-to-noise ratios for the sources located inside the passband sector. In addition, the use of spatial prefilter makes it possible to estimate DOAs for multiple sources more than the number of the elements of an array.     

Quantum efficiency calibration of opto-electronic detector by means of correlated photons method

A new calibration method of detectors can be realized by using correlated photons generated in spontaneous parametric down-conversion (SPDC) effect of nonlinear crystal.An absolute calibration system of detector quantum efficiency is performed.And its principle and experimental setup are introduced.A continuouswave (CW) ultraviolet (351 nm),diode-pumped,frequency-doubled,and solid-state laser is used to pump BBO crystal.The quantum efficiencies of the photomultiplier at 633,702,and 789 nm are measured respectively.The coincidence peaks are observed using coincidence circuit.Some measurement factors including the filter bandwidth of trigger channel,the detector position alignment and polarization of the pump light are analyzed.The uncertainties of this calibration method are also analyzed,and the relative uncertainties of total calibration are less than 5.8%.The accuracy of this method could be improved in the future.