O433 2002010074国际互联网上的光谱学信息资源-Ⅰ=Resources ofspectroscopy and spectrometry on the world wideweb-Ⅰ[刊,中]/戴惟萌(厦门大学计算机网络中心.福建,厦门(361005)),赵丽(厦门大学化工学院现代分析科学教育部重点实验...O433 2002010074国际互联网上的光谱学信息资源-Ⅰ=Resources ofspectroscopy and spectrometry on the world wideweb-Ⅰ[刊,中]/戴惟萌(厦门大学计算机网络中心.福建,厦门(361005)),赵丽(厦门大学化工学院现代分析科学教育部重点实验室.福建,厦门(361005))展开更多
O433 2005010073 表面增强能量转移效应的研究=Study of surface enhanced energy transfer effect[刊,中]／薛军(武警工程学院物理室．陕西,西安(710086))／／光子学报．-2004,33 (2)．-195-199 通过分析2、2’菁染料水溶液、银胶体以...O433 2005010073 表面增强能量转移效应的研究=Study of surface enhanced energy transfer effect[刊,中]／薛军(武警工程学院物理室．陕西,西安(710086))／／光子学报．-2004,33 (2)．-195-199 通过分析2、2’菁染料水溶液、银胶体以及2。展开更多
目的：探讨跟骨定量超声法（QUS）在诊断和筛查骨质疏松患者中的临床价值。方法：选取200例50～79岁绝经后体检健康的妇女作为研究对象，分别采用QUS法测量左跟骨强度指数（SI）、超声波传导速度（SOS）、超声波振幅衰减（BUA）；双能X...目的：探讨跟骨定量超声法（QUS）在诊断和筛查骨质疏松患者中的临床价值。方法：选取200例50～79岁绝经后体检健康的妇女作为研究对象，分别采用QUS法测量左跟骨强度指数（SI）、超声波传导速度（SOS）、超声波振幅衰减（BUA）；双能X线吸收法（DXA）检测研究对象的腰椎L1～L4、股骨颈、大粗隆、全髋关节的骨密度（BM D ）值，以DXA 检测结果作为金标准计算QUS诊断骨质疏松的诊断学评价指标。结果：50～59岁组的S I 77．21±13．07（％）、S O S 104．8±14．72（m／s ）、BUA 1548．9±27．5（dB／MHz ）值均显著高于60～69岁和70～79岁组（ P＜0．05）；于60～69岁和70～79岁的SI 、SOS 、BUA检测值比较差异不具有统计学意义（P＞0．05）。DXA检测结果显示不同年龄组研究对象的腰椎L2、L4、股骨颈、大粗隆、全髋关节的BM D检测结果差异具有统计学意义（P＜0．05），50～59岁组的腰椎L2、L4、股骨颈、大粗隆、全髋关节的BMD检测值显著的高于60～69岁和70～79岁组（ P＜0．05）。DXA 共确诊31例骨质疏松患者，诊断率为15．50％，QUS正确诊断24例骨质疏松患者，QUS 诊断的灵敏度77．42％、特异度87．57％、漏诊率22．58％、误诊率12．43％、阳性预测值53．33％、阴性预测值95．48％，Kappa 0．549（P＜0．05）。结论：QUS可以作为大样本人群筛查和诊断骨质疏松的一种简便有效的手段。展开更多
The inhibiting effect of ciprofloxacin,norfloxacin and ofloxacin on the corrosion of mild steel in 1 mol·L-1 HCl and the mechanism were studied at different temperatures using mass loss measurement,electrochemica...The inhibiting effect of ciprofloxacin,norfloxacin and ofloxacin on the corrosion of mild steel in 1 mol·L-1 HCl and the mechanism were studied at different temperatures using mass loss measurement,electrochemical method,and X-ray photoelectron spectroscopy(XPS) .Effective inhibition was shown by mass loss,potentiodynamic polarization and impedance spectroscopy measurement.The corrosion rate of the metal in the mass loss measurement,and the corrosion reaction on cathode and anode in the electrochemical measurement were accelerated when temperature was increased.XPS results showed that the inhibitors adsorbed effectively on the metal surface.展开更多
To compare mid-infrared(MIR)and near-infrared(NIR)spectroscopies for the determination of the fat and protein contents in milk,the same sample sets with varying concentrations of fat and protein were measured in the M...To compare mid-infrared(MIR)and near-infrared(NIR)spectroscopies for the determination of the fat and protein contents in milk,the same sample sets with varying concentrations of fat and protein were measured in the MIR range of 3 200-700 cm-1 and NIR range of 9 000-4 000 cm-1.The spectral features in the two regions were analyzed.The MIR spectra of milk were characteristic due to the MIR inherent molecular specificity,whereas the NIR spectra were relatively characterless due to the NIR low selectivity.Partial least squares(PLS)regression models for fat and protein were developed by using both MIR and NIR spectra.MIR data with no pretreatment gave better results than NIR data.The square correlation coefficient(R2)and the root mean square error of prediction(RMSEP)were 0.98 and 0.10 g/dL for fat and 0.97 and 0.11 g/dL for protein.With NIR techniques,satisfactory results were not obtained with raw data.However,NIR data after pretreatment gave similarly good results to the ones using MIR method.This paper indicates that either of the MIR and NIR spectral methods is reliable for the determination of the fat and protein contents.展开更多
To improve spectrum utilization and minimize interference to Primary User (PU), an adaptive spectrum decision method is proposed for Secondary User (SU), while taking traffic load balancing and spectrum heterogeneity ...To improve spectrum utilization and minimize interference to Primary User (PU), an adaptive spectrum decision method is proposed for Secondary User (SU), while taking traffic load balancing and spectrum heterogeneity into consideration. Long-term statistics and current sensing results are integrated into the proposed decision method of spectrum access. Two decision methods, namely probability based and sensing based, are presented, compared and followed by performance analysis in terms of delay. For probability based spectrum decision, Short-Time-Job-First (STJF) priority queuing discipline is employed to minimize average residual time and theoretical conclusion is derived in a novel way. For sensing based decision we treat the interrupted service of SU as newly incoming and re-decision process is initialized to find available spectrum in a First-Available-First-Access (FAFA) fashion. Effect of sensing error in PHY layer is also analyzed in terms of extended average residual time. Simulation results show that, for relatively low arriving rate of SU traffic, the proposed spectrum decision method yields at least a delay reduction of 39.5% compared with non-adaptive method. The proposed spectrum decision can significantly improve delay performance even facing sensing errors, which cause performance degeneration to both PU and SU.展开更多
The authenticity of 91 wines produced in Cyprus from both indigenous and other vine varieties were investigated by a holistic approach, using, advanced technology such as SNIF-NMR （site-specific natural isotopic frac...The authenticity of 91 wines produced in Cyprus from both indigenous and other vine varieties were investigated by a holistic approach, using, advanced technology such as SNIF-NMR （site-specific natural isotopic fractionation-nuclear magnetic resonance） and 1R-MS （isotope ratio-mass spectrometry） for the determination of the stable isotopes and ICP （inductively coupled plasma spectroscopy） for some heavy metals. The spectroscopic characteristics were evaluated statistically using different chemometric methods. The dependency of the D/H （deuterium/hydrogen） ratio of the methylene site in the ethanol molecule （D/H）ll and also theδ ^18O values of the wine water, were the most useful discriminators. Isotopic results allow us to have a complete idea about the regional variability of the isotopes. Among the metals, Ni followed by Pb was the ones with the highest discrimination value. The determined concentrations of Pb, Ni, Cr and Cd that are related to the safety of wines were within the acceptable limits that have been established by the OIV （international organization of vine and wine） or comparable with the results of the wines of other European countries. The study of the correlation between the load of heavy metals and isotopes in wines showed a dependence on the grape variety but not the geographical location of the vineyard. This is probably due to the close proximity of wine regions in Cyprus.展开更多
A method to determine Fe（Ⅲ） by thin layer resin phase spectrophotometry has been developed in this paper. The colored complex formed by Fe（Ⅲ） and 1,2-benzendiol is concentrated on the 717^# resin, then Fe（Ⅲ） ...A method to determine Fe（Ⅲ） by thin layer resin phase spectrophotometry has been developed in this paper. The colored complex formed by Fe（Ⅲ） and 1,2-benzendiol is concentrated on the 717^# resin, then Fe（Ⅲ） can be determined directly by making thin layer. The method is sensitive with a apparent molar absorption of 4.8×10^4L/mol.cm, which is 16 times higher than that of liquid phase spectrophotornetry, most coexisting ions do not influence the determination. The detection limit for Fe（Ⅲ） is 1.47μg/L with the precision of 3.3% [n=6, 7μg/50mL Fe（Ⅲ）]. The calibration curve is linear in the range of 0-25μg/50mL. The preposed method was applied to the determination of Fe（Ⅲ） in water sample with satisfactory results.展开更多
文摘O433 2002010074国际互联网上的光谱学信息资源-Ⅰ=Resources ofspectroscopy and spectrometry on the world wideweb-Ⅰ[刊,中]/戴惟萌(厦门大学计算机网络中心.福建,厦门(361005)),赵丽(厦门大学化工学院现代分析科学教育部重点实验室.福建,厦门(361005))
文摘O433 2005010073 表面增强能量转移效应的研究=Study of surface enhanced energy transfer effect[刊,中]／薛军(武警工程学院物理室．陕西,西安(710086))／／光子学报．-2004,33 (2)．-195-199 通过分析2、2’菁染料水溶液、银胶体以及2。
文摘目的：探讨跟骨定量超声法（QUS）在诊断和筛查骨质疏松患者中的临床价值。方法：选取200例50～79岁绝经后体检健康的妇女作为研究对象，分别采用QUS法测量左跟骨强度指数（SI）、超声波传导速度（SOS）、超声波振幅衰减（BUA）；双能X线吸收法（DXA）检测研究对象的腰椎L1～L4、股骨颈、大粗隆、全髋关节的骨密度（BM D ）值，以DXA 检测结果作为金标准计算QUS诊断骨质疏松的诊断学评价指标。结果：50～59岁组的S I 77．21±13．07（％）、S O S 104．8±14．72（m／s ）、BUA 1548．9±27．5（dB／MHz ）值均显著高于60～69岁和70～79岁组（ P＜0．05）；于60～69岁和70～79岁的SI 、SOS 、BUA检测值比较差异不具有统计学意义（P＞0．05）。DXA检测结果显示不同年龄组研究对象的腰椎L2、L4、股骨颈、大粗隆、全髋关节的BM D检测结果差异具有统计学意义（P＜0．05），50～59岁组的腰椎L2、L4、股骨颈、大粗隆、全髋关节的BMD检测值显著的高于60～69岁和70～79岁组（ P＜0．05）。DXA 共确诊31例骨质疏松患者，诊断率为15．50％，QUS正确诊断24例骨质疏松患者，QUS 诊断的灵敏度77．42％、特异度87．57％、漏诊率22．58％、误诊率12．43％、阳性预测值53．33％、阴性预测值95．48％，Kappa 0．549（P＜0．05）。结论：QUS可以作为大样本人群筛查和诊断骨质疏松的一种简便有效的手段。
基金Supported by the National Science ＆ Technology Pillar Program（082603101c） China Postdoctoral Science Foundation （O92623101H）+2 种基金 Shandong Postdoctoral Foundation（200902040） Open Project Program of Marine Corrosion and Protection Research Center of Institute of Oceanology Chinese Academy of Science（200901005） Doctor Foundation of University of Jinan（XBS0899）
文摘The inhibiting effect of ciprofloxacin,norfloxacin and ofloxacin on the corrosion of mild steel in 1 mol·L-1 HCl and the mechanism were studied at different temperatures using mass loss measurement,electrochemical method,and X-ray photoelectron spectroscopy(XPS) .Effective inhibition was shown by mass loss,potentiodynamic polarization and impedance spectroscopy measurement.The corrosion rate of the metal in the mass loss measurement,and the corrosion reaction on cathode and anode in the electrochemical measurement were accelerated when temperature was increased.XPS results showed that the inhibitors adsorbed effectively on the metal surface.
基金Supported by National Natural Science Foundation of China(No.30170261)the 10th Five-Year Plan of China(No.2004BA706B12).
文摘To compare mid-infrared(MIR)and near-infrared(NIR)spectroscopies for the determination of the fat and protein contents in milk,the same sample sets with varying concentrations of fat and protein were measured in the MIR range of 3 200-700 cm-1 and NIR range of 9 000-4 000 cm-1.The spectral features in the two regions were analyzed.The MIR spectra of milk were characteristic due to the MIR inherent molecular specificity,whereas the NIR spectra were relatively characterless due to the NIR low selectivity.Partial least squares(PLS)regression models for fat and protein were developed by using both MIR and NIR spectra.MIR data with no pretreatment gave better results than NIR data.The square correlation coefficient(R2)and the root mean square error of prediction(RMSEP)were 0.98 and 0.10 g/dL for fat and 0.97 and 0.11 g/dL for protein.With NIR techniques,satisfactory results were not obtained with raw data.However,NIR data after pretreatment gave similarly good results to the ones using MIR method.This paper indicates that either of the MIR and NIR spectral methods is reliable for the determination of the fat and protein contents.
基金supported partially by China's National 863 Program under Grant No.2009AA01Z207
文摘To improve spectrum utilization and minimize interference to Primary User (PU), an adaptive spectrum decision method is proposed for Secondary User (SU), while taking traffic load balancing and spectrum heterogeneity into consideration. Long-term statistics and current sensing results are integrated into the proposed decision method of spectrum access. Two decision methods, namely probability based and sensing based, are presented, compared and followed by performance analysis in terms of delay. For probability based spectrum decision, Short-Time-Job-First (STJF) priority queuing discipline is employed to minimize average residual time and theoretical conclusion is derived in a novel way. For sensing based decision we treat the interrupted service of SU as newly incoming and re-decision process is initialized to find available spectrum in a First-Available-First-Access (FAFA) fashion. Effect of sensing error in PHY layer is also analyzed in terms of extended average residual time. Simulation results show that, for relatively low arriving rate of SU traffic, the proposed spectrum decision method yields at least a delay reduction of 39.5% compared with non-adaptive method. The proposed spectrum decision can significantly improve delay performance even facing sensing errors, which cause performance degeneration to both PU and SU.
文摘The authenticity of 91 wines produced in Cyprus from both indigenous and other vine varieties were investigated by a holistic approach, using, advanced technology such as SNIF-NMR （site-specific natural isotopic fractionation-nuclear magnetic resonance） and 1R-MS （isotope ratio-mass spectrometry） for the determination of the stable isotopes and ICP （inductively coupled plasma spectroscopy） for some heavy metals. The spectroscopic characteristics were evaluated statistically using different chemometric methods. The dependency of the D/H （deuterium/hydrogen） ratio of the methylene site in the ethanol molecule （D/H）ll and also theδ ^18O values of the wine water, were the most useful discriminators. Isotopic results allow us to have a complete idea about the regional variability of the isotopes. Among the metals, Ni followed by Pb was the ones with the highest discrimination value. The determined concentrations of Pb, Ni, Cr and Cd that are related to the safety of wines were within the acceptable limits that have been established by the OIV （international organization of vine and wine） or comparable with the results of the wines of other European countries. The study of the correlation between the load of heavy metals and isotopes in wines showed a dependence on the grape variety but not the geographical location of the vineyard. This is probably due to the close proximity of wine regions in Cyprus.
基金Advanced Fund Item of Jiangsu University (07KJB610021)
文摘A method to determine Fe（Ⅲ） by thin layer resin phase spectrophotometry has been developed in this paper. The colored complex formed by Fe（Ⅲ） and 1,2-benzendiol is concentrated on the 717^# resin, then Fe（Ⅲ） can be determined directly by making thin layer. The method is sensitive with a apparent molar absorption of 4.8×10^4L/mol.cm, which is 16 times higher than that of liquid phase spectrophotornetry, most coexisting ions do not influence the determination. The detection limit for Fe（Ⅲ） is 1.47μg/L with the precision of 3.3% [n=6, 7μg/50mL Fe（Ⅲ）]. The calibration curve is linear in the range of 0-25μg/50mL. The preposed method was applied to the determination of Fe（Ⅲ） in water sample with satisfactory results.
