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5-Br-PADAP-TritonX-100光度法连续测定铜和锰 被引量:5
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作者 萨木嘎 刘颖 +1 位作者 米拉 嘎日迪 《冶金分析》 CAS CSCD 北大核心 2000年第3期42-44,共3页
研究了非离子型表面活性剂TritonX 1 0 0存在下 ,用 5 Br PADAP光度法联合测定铜和锰的方法。结果表明 :在 pH 9 0的硼砂缓冲介质中 ,5 Br PADAP与铜 (锰 )生成紫红色络合物 ,λmax=575nm ,ε575=1 0 4× 1 0 5。铜量在 0~ 1 4μg... 研究了非离子型表面活性剂TritonX 1 0 0存在下 ,用 5 Br PADAP光度法联合测定铜和锰的方法。结果表明 :在 pH 9 0的硼砂缓冲介质中 ,5 Br PADAP与铜 (锰 )生成紫红色络合物 ,λmax=575nm ,ε575=1 0 4× 1 0 5。铜量在 0~ 1 4μg/2 5mL(锰量在 0~ 1 0 μg/2 5mL)的范围内符合比尔定律。实测了钢样中铜和锰的含量 ,结果令人满意。 展开更多
关键词 分光光度 钢样 光度层 连续测定
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穗型和行距对水稻冠层受光态势的影响 被引量:58
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作者 王建林 徐正进 《中国水稻科学》 CAS CSCD 北大核心 2005年第5期422-426,共5页
提出了量化指标半消光深度(Ds)和冠层照光度(CLI)两个概念。利用这两项指标对不同行距下不同穗型水稻冠层的受光态势进行了比较研究,结果表明:在孕穗期,叶角是决定不同品种之间光分布差异的主要因素。一般叶角越小,冠层受光越优越。在... 提出了量化指标半消光深度(Ds)和冠层照光度(CLI)两个概念。利用这两项指标对不同行距下不同穗型水稻冠层的受光态势进行了比较研究,结果表明:在孕穗期,叶角是决定不同品种之间光分布差异的主要因素。一般叶角越小,冠层受光越优越。在齐穗期穗子成为影响冠层光分布的主要因素,并以弯穗型品种穗子遮光强烈而对冠层内光分布影响较大。灌浆期穗型的变化仍然是影响冠层光分布的主要因素:弯曲穗型由于穗子严重弯曲,上部受光良好,但下部并不比其他穗型优越。无论什么品种,在整个生育时期行距越宽,冠层受光越好。相同品种相同行距在不同生育时期光分布有明显变化,一般是在孕穗期光照条件比齐穗期优越,到灌浆期光照条件又有所改善。但不同品种变化规律不尽一致。 展开更多
关键词 穗型 行距 水稻 半消光深度 光度
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Numerical Study of Optimization of Layer Thickness in Bilayer Organic Light-Emitting Diodes 被引量:3
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作者 彭应全 张磊 张旭 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2003年第5期454-460,共7页
A numerical model for bilayer organic light-emitting diodes (OLEDs) is developed under the basis of trapped charge limited conduction.The dependences of the current density on the layer thickness,trap properties and c... A numerical model for bilayer organic light-emitting diodes (OLEDs) is developed under the basis of trapped charge limited conduction.The dependences of the current density on the layer thickness,trap properties and carrier mobility of the hole transport layer (HTL) and emission layer (EML) in bilayer OLEDs of the structure anode/HTL/EML/cathode are numerically investigated.It is found that,for given values of the total thickness of organic layers,reduced depth of trap,total density of trap,and carrier mobility of HTL as well as EML,there exists an optimal thickness ratio of HTL to EML,by which a maximal quantum efficiency can be achieved.Through optimization of the thickness ratio,an enhancement of current density and quantum efficiency of as much as two orders of magnitude can be obtained.The dependences of the optimal thickness ratio to the characteristic trap energy,total density of trap and carrier mobility are numerically analyzed. 展开更多
关键词 organic light-emitting diodes BILAYER OPTIMIZATION
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Synthesis of Y_2O_3 particle enhanced Ni/TiC composite on TC4 Ti alloy by laser cladding 被引量:18
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作者 张可敏 邹建新 +2 位作者 李军 于治水 王慧萍 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期1817-1823,共7页
A Y2O3 particle enhanced Ni/TiC composite coating was fabricated in-situ on a TC4 Ti alloy by laser surface cladding. The phase component, microstructure, composition distribution and properties of the composite layer... A Y2O3 particle enhanced Ni/TiC composite coating was fabricated in-situ on a TC4 Ti alloy by laser surface cladding. The phase component, microstructure, composition distribution and properties of the composite layer were investigated. The composite layer has graded microstructures and compositions, due to the fast melting followed by rapid solidification and cooling during laser cladding. The TiC powders are completely dissolved into the melted layer during melting and segregated as fine dendrites when solidified. The size of TiC dendrites decreases with increasing depth. Y2O3 fine particles distribute in the whole clad layer. The Y2O3 particle enhanced Ni/TiC composite layer has a quite uniform hardness along depth with a maximum value of HV1380, which is 4 times higher than the initial hardness. The wear resistance of the Ti alloy is significantly improved after laser cladding due to the high hardness of the composite coating. 展开更多
关键词 TC4 Ti alloy Ni/TiC composite Y2O3 laser cladding HARDNESS surface modification
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High-Integrated-Photosensitivity Negative-Electron-Affinity GaAs Photocathodes with Multilayer Be-Doping Structures
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作者 王晓峰 曾一平 +4 位作者 王保强 朱占平 杜晓晴 李敏 常本康 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第9期1692-1698,共7页
The effect of changing Be doping concentration in GaAs layer on the integrated photosensitivity for nega- tive-electron-affinity GaAs photocathodes is investigated. Two GaAs samples with the monolayer structure and th... The effect of changing Be doping concentration in GaAs layer on the integrated photosensitivity for nega- tive-electron-affinity GaAs photocathodes is investigated. Two GaAs samples with the monolayer structure and the muhilayer structure are grown by molecular beam epitaxy. The former has a constant Be concentration of 1 × 10^19 cm^-3, while the latter includes four layers with Be doping concentrations of 1 × 10^19, 7 × 10^18, 4 × 10^18, and 1 × 10^18 cm^-3 from the bottom to the surface. Negative-electron-affinity GaAs photocathodes are fabricated by exciting the sample surfaces with alternating input of Cs and O in the high vacuum system. The spectral response results measured by the on-line spectral response measurement system show that the integrated photosensitivity of the photocathode with the muhilayer structure enhanced by at least 50% as compared to that of the monolayer structure. This attributes to the improvement in the crystal quality and the increase in the surface escape probability. Different stress situations are observed on GaAs samples with monolayer structure and muhilayer structure, respectively. 展开更多
关键词 integrated photosensitivity muhilayer structure NEA photocathode diffusion length surface escape probability
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Preliminary Results of Assessing the Mixing of Wave Transport Flux Residualin the Upper Ocean with ROMS 被引量:2
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作者 SHI Yongfang WU Kejian YANG Yongzeng 《Journal of Ocean University of China》 SCIE CAS 2016年第2期193-200,共8页
The effects of the mixing of wave transport flux residual(Bvl) on the upper ocean is studied through carrying out the control run(CR) and a series of sensitive runs(SR) with ROMS model.In this study,the important role... The effects of the mixing of wave transport flux residual(Bvl) on the upper ocean is studied through carrying out the control run(CR) and a series of sensitive runs(SR) with ROMS model.In this study,the important role of Bvl is revealed by comparing the ocean temperature,statistical analysis of errors and evaluating the mixed layer depth.It is shown that the overestimated SST is improved effectively when the wave-induced mixing is incorporated to the vertical mixing scheme.As can be seen from the vertical structure of temperature 28℃ isotherm changes from 20 min CR to 35 m in SR3,which is more close to the observation.Statistic analysis shows that the root-mean-square errors of the temperature in 10 m are reduced and the correlation between model results and observation data are increased after considering the effect of Bvl.The numerical results of the ocean temperature show improvement in summer and in tropical zones in winter,especially in the strong current regions in summer.In August the mixed layer depth(MLD) which is defined as the depth that the temperature has changed 0.5℃ from the reference depth of 10 m is further analyzed.The simulation results have a close relationship with undetermined coefficient of Bvl,sensitivity studies show that a coefficient about 0.1 is reasonable value in the model. 展开更多
关键词 Bvl ocean temperature mixed layer depth ROMS model
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Initial Results of Lidar Measured Middle Atmosphere Temperatures over Tibetan Plateau 被引量:8
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作者 QIAO Shuai PAN Weilin +2 位作者 ZHU Ke-Yun ZOU Rong-Shi TAN Jing 《Atmospheric and Oceanic Science Letters》 CSCD 2014年第3期213-217,共5页
During August 2013,a mobile Rayleigh lidar was deployed in Lhasa,Tibet(29.6°N,91.0°E) for making measurements of middle atmosphere densities and temperatures from 30 to 90 km.In this paper,the authors presen... During August 2013,a mobile Rayleigh lidar was deployed in Lhasa,Tibet(29.6°N,91.0°E) for making measurements of middle atmosphere densities and temperatures from 30 to 90 km.In this paper,the authors present the initial results from this scientific campaign,Middle Atmosphere Remote Mobile Observatory in Tibet(MARMOT),and compared the results to the MSIS-00(Mass Spectrometer and Incoherent Scatter) model.This work will advance our understanding of middle atmosphere dynamic processes,especially over the Tibetan Plateau area. 展开更多
关键词 lidarmiddle atmospheretemperatureMass SPECTROMETER and INCOHERENT SCATTER model
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Spectral computed tomography in advanced gastric cancer: Can iodine concentration non-invasively assess angiogenesis? 被引量:57
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作者 Xiao-Hua Chen Ke Ren +3 位作者 Pan Liang Yaru Chai Kui-Sheng Chen Jian-Bo Gao 《World Journal of Gastroenterology》 SCIE CAS 2017年第9期1666-1675,共10页
AIM To investigate the correlation of iodine concentration(IC) generated by spectral computed tomography(CT) with micro-vessel density(MVD) and vascular endothelial growth factor(VEGF) expression in patients with adva... AIM To investigate the correlation of iodine concentration(IC) generated by spectral computed tomography(CT) with micro-vessel density(MVD) and vascular endothelial growth factor(VEGF) expression in patients with advanced gastric carcinoma(GC).METHODS Thirty-four advanced GC patients underwent abdominal enhanced CT in the gemstone spectral imaging mode. The IC of the primary lesion in the arterial phase(AP) and venous phase(VP) were measured, and were then normalized against that in the aorta to provide the normalized IC(nI C). MVD and VEGF were detected by immunohistochemical assays, using CD34 and VEGF-A antibodies, respectively. Correlations of nI C with MVD, VEGF, and clinical-pathological features were analyzed.RESULTS Both nI Cs correlated linearly with MVD and were higher in the primary lesion site than in the normal control site, but were not correlated with VEGF expression. After stratification by clinical-pathological subtypes, nI C-AP showed a statistically significant correlation with MVD, particularly in the group with tumors at stage T4, without nodular involvement, of a mixed Lauren type, where the tumor was located at the antrum site, and occurred in female individuals. nI C-VP showed a positive correlation with MVD in the group with the tumor at stage T4 and above, had nodular involvement, was poorly differentiated, was located at the pylorus site, of a mixed and diffused Lauren subtype, and occurred in male individuals. nI C-AP and nI C-VP showed significant differences in terms of histological differentiation and Lauren subtype.CONCLUSION The IC detected by spectral CT correlated with the MVD. n IC-AP and n IC-VP can reflect angiogenesis in different pathological subgroups of advanced GC. 展开更多
关键词 Micro-vessel density Iodine concentration Spectral computed tomography Vascular endothelial growth factor Gastric cancer
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(Al_xGa_(1-x))_yIn_(1-y)P Films and Its Optical Constants on the Surface
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作者 ZHANGShu-zhi HUANGBo-biao 《Semiconductor Photonics and Technology》 CAS 1999年第2期86-91,共6页
The optical parameters for three samples of intrinsic, doped Si and doped Mg (Al x Ga 1- x ) y In 1- y P prepared by the MOCVD on GaAs substrate were measured by using ellipsometry and were calc... The optical parameters for three samples of intrinsic, doped Si and doped Mg (Al x Ga 1- x ) y In 1- y P prepared by the MOCVD on GaAs substrate were measured by using ellipsometry and were calculated by the two-layer absorption film model. The results obtained were discussed. The grown rates and thickness of oxidic layer on the intrinsic (Al x Ga 1- x ) y In 1- y P surface exposed in the atmosphere were studied. A linear dependence of oxidic layer thickness on the time was obtained. 展开更多
关键词 Ellipsometry Optical Parameters Oxidic Layer Two-layer Absorption Film Model CLC number:TN304.23 O472.3 Document code:A
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Technology of Laser Protection and Defrosting Film
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作者 CHEYing SHENYuzhi 《Semiconductor Photonics and Technology》 CAS 1997年第4期306-310,共5页
A compound coating of electrically conductive and visible transparent film and laser protective film has been developed,this coating has light densities of no less than 4 against 0.53 μm and no less than 3 against 1.... A compound coating of electrically conductive and visible transparent film and laser protective film has been developed,this coating has light densities of no less than 4 against 0.53 μm and no less than 3 against 1.06 μm in the range of ±30° angular field.The average transmittance value as high as 60% from 0.4 μm to 0.7 μm has been achieved.The structures of the laser protective filters are compared.The refractive index of a compound material used in the matching layer has been given.Measured results of the laser protective film coating are compared with that of the compound coating. 展开更多
关键词 Electrically Conductive Layer Laser Protection Matching Layer Visible Transparency
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Detection of coal dust in a mine using optical tomography 被引量:4
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作者 Wei Mingsheng Tong Minming +2 位作者 Hao Jifei Cai Li Xu Jie 《International Journal of Mining Science and Technology》 2012年第4期523-527,共5页
A dust concentration imaging system based on optical tomography is proposed to monitor concentration variations of coal dust in a mine.Concentration profiles,rather than just a point value,of coal dust concentrations ... A dust concentration imaging system based on optical tomography is proposed to monitor concentration variations of coal dust in a mine.Concentration profiles,rather than just a point value,of coal dust concentrations are the goal of this method.An optical sensor array is employed to realize an optical sensing field of the coal dust concentration during on-line monitoring.A novel image reconstruction algorithm,called the simultaneous iterative reconstruction technique(SIRT),is compared to the well known linear,back projection algorithm(LBP).The SIRT was applied to the present problem and tested by modeling.The disadvantage of the SIRT is a slow speed but some improvements have been made by adding a weighting function that reduces the relative error to 1.7% from 3.1% for 50 iterations.The results of image reconstruction are presented for both simulated and real objects.They prove that the optical tomography technique,based on a multi-source fan projection scheme,can be an effective approach for estimating coal dust distribution.This system can be applied in real time for continuous measurements in a mine. 展开更多
关键词 Coal dustConcentration distributionSensor arrayOptical tomography
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STUDY ON DETERMINATION OF TRACE Fe BY Fe(Ⅱ)-VA THIN LAYER RESIN PHASE SPECTROPHOTOMETRY
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作者 SONG Huanyu YAN Yongsheng WANG Yun 《Chinese Journal of Reactive Polymers》 2006年第2期155-160,共6页
A new method for the determination of Fe by thin layer resin phase spectrophotometry in alkali condition was reported. The complex anion formed by Fe(Ⅱ) and VA was absorbed on the 717w resin and Fe was determined b... A new method for the determination of Fe by thin layer resin phase spectrophotometry in alkali condition was reported. The complex anion formed by Fe(Ⅱ) and VA was absorbed on the 717w resin and Fe was determined by making thin layer. This method had a high sensitivity (ε620= 3.0×10^5L/mol.cm), which was 15 times higher than that of liquid phase spectrophotometry. It had been proved a satisfactory precision (5.01μg Fe, n=6, RSD=1.8%). The trace Fe in natural water was determined and the recovery was 97%. 展开更多
关键词 Thin layer resin phase spectrophotometry TRACE FE
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STUDY ON THE DETERMINATION OF TRACE BISMUTH(III) BY THIN-LAYER RESIN PHASE SPECTROPHOTOMETRY
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作者 YAN Yongsheng LUXiaohua FU Chengguang 《Chinese Journal of Reactive Polymers》 2003年第1期50-58,共9页
In this paper, a new thin-layer ion-exchange resin phase analytical method is introduced. It is based on that, the bismuthous cation can associate with iodic anions, so as to formed an anion complex [BiI4-] in a stron... In this paper, a new thin-layer ion-exchange resin phase analytical method is introduced. It is based on that, the bismuthous cation can associate with iodic anions, so as to formed an anion complex [BiI4-] in a strong acidic environments. This anion complex can also exchanges with a weaker anions on the surface active site of anion exchange resin, so that a [R+] [BiI4-] solid phase binary associational system is produced. Owing to the solid system is a great many dispersive particulates, it can be pressed to a thin-layer by press tools of the so called 搕hin-layer resin phase?or 搑esin phase? and using this solid association system spectrophotometry for the determination of trace metals. So it can increase the analytical sensitivity. This association system exhibits maximum absorbance at 460nm, and obeys Beer抯 law over the concentration range 0.01ug/ml^1.20ug/ml of bismuthous(III). It has a molar absorptivity of 7.1×105 [L/mol穋m]. It indicated the resin phase spectrophotometry is a sensitive analytical method for trace bismuthous. It is 18 times higher than routine aqueous spectrophotometry. The relative standard deviations is 1.82% (n=6) for the measurements of 0.5ug/ml Bi(III). The detection limit of Bismuthous(III) is 1.4×10-8mol/L. The method has applied to the analysis Bi(III) in environmental water samples. 展开更多
关键词 Thin-layer phase Spectrophotometry Trace bismuth (III) DETERMINATION
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NO_x Release from Snow and Ice Covered Surface in Polar Regions and the Tibetan Plateau
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作者 Feng Wang Weili Lin +1 位作者 Junxia Wang Tong Zhu 《Advances in Climate Change Research》 SCIE 2011年第3期141-148,共8页
The exchanges of NOx between snow and air have significant impact on the atmospheric components and photochemical processes in the overlying boundary layer. Such exchanges increase the oxidizing capacity of the atmosp... The exchanges of NOx between snow and air have significant impact on the atmospheric components and photochemical processes in the overlying boundary layer. Such exchanges increase the oxidizing capacity of the atmosphere and may have a crucial impact on the air signals that are retrieved from ice cores. In the recent years, sunlit snow and ice have been demonstrated to be important NOx sources in the polar atmospheric boundary layer. This paper makes a thorough review on the release of NOx from snow and ice, including field observations and experimental evidences, release mechanisms and influential parameters that affect such a release process, polar NOx concentrations and fluxes, and environmental impacts of the chemical processes of NOx in the polar atmospheric boundary layer. In the Tibetan Plateau, the released NOx observed recently in the sunlit snow/ice-cover is 1-order magnitude more than that in polar regions, but further scientific research is still needed to reveal its impact on the atmospheric oxidizing capacity. 展开更多
关键词 NOx exchange between snow and air polar area atmospheric oxidizing capacity Tibetan Plateau
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Turbulent Energy Budgets of a Ground Vortex Flow
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作者 Jorge M.M. Barata Pedro J.C.T. Santos +1 位作者 André R.R. Silva Diamantino F.G. Durāo 《Journal of Mechanics Engineering and Automation》 2013年第5期311-324,共14页
Turbulent kinetic energy budgets are presented for a highly curved flow generated by the collision of plane wall turbulent jet with a low-velocity boundary layer. The different terms are obtained in the vertical plane... Turbulent kinetic energy budgets are presented for a highly curved flow generated by the collision of plane wall turbulent jet with a low-velocity boundary layer. The different terms are obtained in the vertical plane of symmetry by quadratic interpolation of the LDV (Laser Doppler Velocimetry) measurements, for a wall jet-to-boundary layer velocity ratio of 2. The results, which have relevance to flows encountered in powered-lift aircraft operating in ground effect, quantify the structure of the complex ground vortex flow. The analysis of turbulent energy equation terms using the measured data revealed that production by normal and shear stresses are both very important to the turbulent structure of the impact zone of the ground vortex. This is an indication that the modeling of turbulence of a ground vortex requires a good representation of the production by normal stresses which is most important in the collision zone. 展开更多
关键词 V/STOL (vertical/short take-off and landing) ground vortex TURBULENCE complex flows.
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An Evaluation of Spaceborne Imaging Spectrometry for Estimation of Forest Canopy Nitrogen Concentration in a Subtropical Conifer Plantation of Southern China 被引量:1
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作者 于泉洲 王绍强 +2 位作者 石浩 黄昆 周蕾 《Journal of Resources and Ecology》 CSCD 2014年第1期1-10,共10页
Canopy foliar Nitrogen Concentration (CNC) is one of the most important parameters influencing vegetation productivity in forest ecosystems. In this study, we explored the potential of imaging spectrometry (hypersp... Canopy foliar Nitrogen Concentration (CNC) is one of the most important parameters influencing vegetation productivity in forest ecosystems. In this study, we explored the potential of imaging spectrometry (hyperspectral) remote sensing of CNC in conifer plantations in China’s subtropical red soil hilly region. Our analysis included data from 57 field plots scattered across two transects covered by Hyperion images. Single regression and partial least squares regression (PLSR) were used to explore the relationships between CNC and hyperspectral data. The correlations between CNC and nearinfrared relfectance (NIR) were consistent in three data subsets (subsets A-C). For all subsets, CNC was signiifcantly positively correlated with NIR in the two transects (R2=0.29, 0.33 and 0.36, P&lt;0.05 or P&lt;0.01, respectively). It suggested that the NIR-CNC relationship exist despite a weak one, and the relationship may be weakened by the single canopy structure. Besides, we also applied a shortwave infrared (SWIR) index - Normalized Difference Nitrogen Index (NDNI) to estimate CNC variation. NDNI presented a signiifcant positive correlation with CNC in different subsets, but like NIR, it was also with low coefifcient of determination (R2=0.38, 0.20 and 0.17, P&lt;0.01, respectively). Also, the correlations between CNC and the entire spectrum reflectance (or its derivative and logarithmic transformation) by PLSR owned different signiifcance in various subsets. We did not ifnd the very robust relationship like previous literatures, so the data we used were checked again. The paired T-test was applied to estimate the inlfuence of inter-annual variability of FNC on the relationships between CNC and Hyperion data. The inter-annual mismatch between period of ifeldwork and Hyperion acquisition had no inlfuence on the correlations of CNC-Hyperion data. Meanwhile, we pointed out that the lack of the canopy structure variation in conifer plantation area may lead to these weak relationships. 展开更多
关键词 HYPERION conifer plantation foliar nitrogen concentration forest canopy HYPERION imaging spectrometry remote sensing
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Ti-based composite coatings with gradient TiC_x reinforcements on TC4 titanium alloy prepared by laser cladding 被引量:20
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作者 LIU ShuNv LIU ZongDe +1 位作者 WANG Yang YUE Peng 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第7期1454-1461,共8页
TiCx-NiTi2/Ti cermet composite coatings C1 and C2 with gradient TiCx reinforcements were prepared on TC4 titanium alloy by laser cladding method.The microstructure and phase compositions were analyzed by means of scan... TiCx-NiTi2/Ti cermet composite coatings C1 and C2 with gradient TiCx reinforcements were prepared on TC4 titanium alloy by laser cladding method.The microstructure and phase compositions were analyzed by means of scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS)and X-ray diffraction(XRD)meter.The TiCx exhibited a dendritic microstructure,and homogeneously dispersed in the Ti-based matrix where NiTi2 was embedded.With increasing ingredient supercooling,temperature gradient and cooling temperature,the dendrites displayed a finer morphology with longer primary trunks and intensified side branches in the dilution zone.But the smoothed,coarse columnar ones became dominant in the upper clad layer due to the repeated energy input during multi-track cladding.The Vickers microhardness presented a linear change trend through the cross-sections,which well confirmed the gradient distribution of TiCx.With more TiCx,C1 presented higher hardness than C2. 展开更多
关键词 laser cladding composite coating TiCx-NiTi2 titanium alloy MICROHARDNESS
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Optical bistability based on surface plasmon coupled between two noble metal films involving Kerr materials
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作者 SONG Gang ZHANG Kai +4 位作者 CHEN YuanYuan LIU HuiLi WU Chao YU Li XIAO JingHua 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第4期680-684,共5页
We successfully investigate an optical bistability phenomenon in a layered structure consisting of Kretschmann configuration involving the Kerr-type nonlinear and the silver film. Pure theoretical approaches are emplo... We successfully investigate an optical bistability phenomenon in a layered structure consisting of Kretschmann configuration involving the Kerr-type nonlinear and the silver film. Pure theoretical approaches are employed to investigate that the surface plasmon could easily be coupled and both the reflection and transmission curves versus the incident intensity forms optical bistability. The transmission curves are greatly influenced by the thickness of the second silver film. These results may be useful for designing novel surface plasmon-based optical devices and will be essential for future classical and quantum information processes. 展开更多
关键词 surface plasmon optical bistability Kerr medium quantum information process
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Diagnostic value of optic disc retinal nerve fiber layer thickness for diabetic peripheral neuropathy
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作者 Xiao-hong WU Jing-wen FANG +4 位作者 Yin-qiong HUANG Xue-feng BAI Yong ZHUANG Xiao-yu CHEN Xia-hong LIN 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2020年第11期911-920,共10页
Objective:To investigate the value of optic disc retinal nerve fiber layer(RNFL)thickness in the diagnosis of diabetic peripheral neuropathy(DPN).Methods:Ninety patients with type 2 diabetes,including 60 patients with... Objective:To investigate the value of optic disc retinal nerve fiber layer(RNFL)thickness in the diagnosis of diabetic peripheral neuropathy(DPN).Methods:Ninety patients with type 2 diabetes,including 60 patients without DPN(NDPN group)and 30 patients with DPN(DPN group),and 30 healthy participants(normal group)were enrolled.Optical coherence tomography(OCT)was used to measure the four quadrants and the overall average RNFL thickness of the optic disc.The receiver operator characteristic curve was drawn and the area under the curve(AUC)was calculated to evaluate the diagnostic value of RNFL thickness in the optic disc area for DPN.Results:The RNFL thickness of the DPN group was thinner than those of the normal and NDPN groups in the overall average((101.07±12.40)μm vs.(111.07±6.99)μm and(109.25±6.90)μm),superior quadrant((123.00±19.04)μm vs.(138.93±14.16)μm and(134.47±14.34)μm),and inferior quadrant((129.37±17.50)μm vs.(143.60±12.22)μm and(144.48±14.10)μm),and the differences were statistically significant.The diagnostic efficiencies of the overall average,superior quadrant,and inferior quadrant RNFL thicknesses,and a combined index of superior and inferior quadrant RNFL thicknesses were similar,and the AUCs were 0.739(95%confidence interval(CI)0.635–0.826),0.683(95%CI 0.576–0.778),0.755(95%CI 0.652–0.840),and 0.773(95%CI 0.672–0.854),respectively.The diagnostic sensitivity of RNFL thickness in the superior quadrant reached 93.33%.Conclusions:The thickness of the RNFL in the optic disc can be used as a diagnostic method for DPN. 展开更多
关键词 Type 2 diabetes Peripheral neuropathy Retinal nerve fiber layer thickness Optical coherence tomography DIAGNOSIS
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Study on swelling model and thermodynamic structure of native konjac glucomannan 被引量:1
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作者 Long LI Hui RUAN +3 位作者 Liu-liu MA Wei WANG Ping ZHOU Guo-qing HE 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2009年第4期273-279,共7页
We investigated the higher structure of konjac glucomannan (KGM) in the amorphous state and solution using a laser particle size analyzer and a water activity meter. The results show that the thermodynamic structures ... We investigated the higher structure of konjac glucomannan (KGM) in the amorphous state and solution using a laser particle size analyzer and a water activity meter. The results show that the thermodynamic structures of native KGM were primarily composed of the lamella structure units, which involve both granular crystalline and amorphous regions, and that the connection zones of such units contained both loose and tight aggregation regions. The value of surface tension (σ) of native KGM, resting with the density of its hydroxyl groups' self-association, was an important parameter to analyze the higher structures of native KGM in the thermodynamic swelling model of native KGM. 展开更多
关键词 Swelling model Thermodynamic structure Konjac glucomannan (KGM) Higher structure
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