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微波热效应法合成Y_2O_3∶Eu^(3+)荧光体 被引量:24
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作者 李沅英 戴德昌 蔡少华 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 1995年第6期844-846,共3页
微波热效应法合成Y_2O_3∶Eu^(3+)荧光体李沅英,戴德昌,蔡少华(中山大学化学系,广州,510275)关键词微波热效应法,合成,荧光体,掺铕氧化钇掺铕(Ⅲ)氧化钇荧光体是阴极射线管(CRT)、彩色投影电视和三基... 微波热效应法合成Y_2O_3∶Eu^(3+)荧光体李沅英,戴德昌,蔡少华(中山大学化学系,广州,510275)关键词微波热效应法,合成,荧光体,掺铕氧化钇掺铕(Ⅲ)氧化钇荧光体是阴极射线管(CRT)、彩色投影电视和三基色节能荧光灯等领域的重要发光材料。?.. 展开更多
关键词 微波热效应法 荧光体 氧化钇
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钨酸钙、磷酸镧铈铽、硅酸锌锰的微波热效应法合成及其光致发光性能研究 被引量:1
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作者 王旻 《中山大学研究生学刊(自然科学与医学版)》 1995年第4期20-29,共10页
本文报导了利用微波热效应法合成硅酸盐、钨酸盐、磷酸盐无机荧光粉的结果。X射线粉末衍射数据确证了其晶体结构,证明这些荧光粉晶相组成纯净。还利用日立——850型荧光光谱仪测定了其激发和发射光谱。研究了激活剂、助熔剂等因素对荧... 本文报导了利用微波热效应法合成硅酸盐、钨酸盐、磷酸盐无机荧光粉的结果。X射线粉末衍射数据确证了其晶体结构,证明这些荧光粉晶相组成纯净。还利用日立——850型荧光光谱仪测定了其激发和发射光谱。研究了激活剂、助熔剂等因素对荧光粉发光亮度的影响。 展开更多
关键词 微波热效应法 荧光粉 合成
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热效应法硫酸浓度分析仪
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作者 赵纯 郑溪民 《自动化与仪表》 1997年第4期16-19,共4页
热效应法硫酸浓度分析仪AnAnalyserofSulphunicAcidConcentrationbyHeatEfectMethod●赵纯郑溪民ZhaoChunZhengXimin测定硫酸浓度的方法一般有热效应法、玫... 热效应法硫酸浓度分析仪AnAnalyserofSulphunicAcidConcentrationbyHeatEfectMethod●赵纯郑溪民ZhaoChunZhengXimin测定硫酸浓度的方法一般有热效应法、玫瑰红酸钡法、二次滴定法及离心沉降法... 展开更多
关键词 硫酸浓度测定 热效应法 硫酸生产 浓度分析仪
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热效应法硫酸浓度分析仪
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作者 赵纯 郑溪民 《自动化与仪表》 1997年第3期21-24,共4页
热效应法硫酸浓度分析仪AnAnalyserofSulphunicAcidConcentrationbyHeatEfectMethod●赵纯郑溪民ZhaoChunZhengXimi测定硫酸浓度的方法一般有热效应法、玫瑰... 热效应法硫酸浓度分析仪AnAnalyserofSulphunicAcidConcentrationbyHeatEfectMethod●赵纯郑溪民ZhaoChunZhengXimi测定硫酸浓度的方法一般有热效应法、玫瑰红酸钡法、二次滴定法及离心沉降法等... 展开更多
关键词 硫酸浓度测定 热效应法 硫酸生产 浓度分析仪
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Y_2O_2S:Eu^(3+)荧光体的微波热效应合成和发光性能 被引量:22
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作者 李沅英 戴德昌 蔡少华 《中国稀土学报》 CAS CSCD 北大核心 1996年第1期16-19,共4页
用微波热效应法合成Y_2O_3S∶Eu^(3+)粉晶荧光体,经X射线粉末衍射分析确证其为六方晶系,计算得到其晶胞参数。α=0.3785nm,c=0.6590nm.激发光谱峰呈宽带状,最大激发光谱峰λ_(ex)=261nm... 用微波热效应法合成Y_2O_3S∶Eu^(3+)粉晶荧光体,经X射线粉末衍射分析确证其为六方晶系,计算得到其晶胞参数。α=0.3785nm,c=0.6590nm.激发光谱峰呈宽带状,最大激发光谱峰λ_(ex)=261nm,最大发射光谱峰λ_(ex)=626nm,其次还有595、617和706nm,归属为Eu^(3+)离子的~5D_0-~7F_J(J=1、2、4)特征发射。在254nm光激发下,测定其发光色坐标x=0.665,y=0.330。相对发光亮度与Y_2O_3:Eu^(3+)标准荧光体比较为62%,在365nm光激发下,亦可发射强的鲜艳红光。 展开更多
关键词 微波热效应法 合成 稀土荧光体 荧光材料
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中山大学研究生学刊(自然科学版)一九九五年第16卷总目录
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《中山大学研究生学刊(自然科学与医学版)》 1995年第4期90-92,共3页
关键词 研究生 中山大学 自然科学版 总目录 研究进展 学刊 相转移催化合成 制备 微波热效应法 博士生导师
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Study on Mechanisms of Cd^(2+) Sorption on Goethite byMicrocalorimetry 被引量:1
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作者 ZHANG GUIYIN WANG TIANZHI +1 位作者 DONG YUANYAN LI XUEYUANI(1Huazhong Agricultural University, Wuhan 43OO7O (China))(2Agricultural University of Hebei, Baoding 071001 (China))(3 Wuhan University, Wuhan 450072 (China)) 《Pedosphere》 SCIE CAS CSCD 1999年第4期357-362,共6页
A study on energy changes and mechanisms of Cd sorbed on goethite was performed using the technique ofmicrocalorimetry. The data of the amount of Cd sorption (Aq) and concentration of Cd in equilibrium solution(Ce), a... A study on energy changes and mechanisms of Cd sorbed on goethite was performed using the technique ofmicrocalorimetry. The data of the amount of Cd sorption (Aq) and concentration of Cd in equilibrium solution(Ce), and the data of Aq and the heat effect (AH) caused by Cd^2+ sorption on goethite all fitted Langmuirisotherm. The amount of heat released from Cd sorption on goethite increased with the amount of Ce or Aq.The reaction process of Cd sorption on goethite may be divided into five stages and three plateaus, dependingon the variation of enthalpy change (.Hm) of Cd sorption with Aq, which implied three mechanisms ofinteraCtion between Cd and goethite. The experimental results showed that the microcalorimetry may beuseful for determination of microcalorie variation in soil. 展开更多
关键词 CADMIUM GOETHITE heat effect MICROCALORIMETRY SORPTION
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The critical loading for lateral buckling of continuous welded rail 被引量:1
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作者 SUNG Wen-pei SHIH Ming-hsiang +1 位作者 LIN Cheng-I GO Cheer Germ 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第8期878-885,共8页
The most significant differences between continuous welded rails (CWRs) and general split-type connectors are axial compression in the longitudinal direction, buckling stability and other issues generated under the ... The most significant differences between continuous welded rails (CWRs) and general split-type connectors are axial compression in the longitudinal direction, buckling stability and other issues generated under the influence of thermal effect. Under thermal effect, a dynamical behavior similar to that of a beam fixed on two sides occurs in the central locked area of the welded rail, as there is axial compression but no possibility of sliding. Continuous welded rails do not contract or expand, and are supported by the dynamical system made up of ballasts and rail clips. The rail-support system mentioned above has the features of non-uniform material distribution and uncertainty of construction quality. Due to these facts, the dynamics method based on the linear elastic hypothesis cannot correctly evaluate the rail's buckling conditions. This study is aimed at applying Finite Difference Method (FDM) and Monte Carlo Random Normal Variables Method to the analysis of welded rail's buckling behavior during the train's acceleration and deceleration, under thermal effect and uncertain factors of ballast and rail clips. The analysis result showed that buckling occurs under the combined effect of thermal effect and the train's deceleration force co-effect and the variance ratio of ballast and rail clips is over 0.85, or under the combined effect of thermal effect and the train's acceleration force when the ariance ratio is over 0.88. 展开更多
关键词 Thermal effect Finite Difference Method Monte Carlo Method Buckling load
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Two-and Three-Dimensional Urban Core Determinants of the Urban Heat Island: A Statistical Approach 被引量:1
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作者 Bumseok Chun Jean-Michel Guldmann 《Journal of Environmental Science and Engineering(B)》 2012年第3期363-378,共16页
There is no doubt that the UHI (urban heat island) is a mounting problem in built-up environments, due to the energy retention by surface dense building materials, leading to increased temperatures, air pollution, a... There is no doubt that the UHI (urban heat island) is a mounting problem in built-up environments, due to the energy retention by surface dense building materials, leading to increased temperatures, air pollution, and energy consumption. Much of the earlier research on the UHI has used two-dimensional (2-D) information, such as land uses and the distribution of vegetation. In the case of homogeneous land uses, it is possible to predict surface temperatures with reasonable accuracy with 2-D information. However, three-dimensional (3-D) information is necessary to analyze more complex sites, including dense building clusters. In this research, 3-D building geometry information is combined with 2-D urban surface information to examine the relationship between urban characteristics and temperature. The research includes the following stages: (1) estimating urban temperature; (2) developing a 3-D city model; (3) generating geometric parameters; and (4) conducting statistical analyses using both linear and non-linear regression models. The implications of the results are discussed, providing guidelines for policies aiming to reduce the UHI. 展开更多
关键词 Urban heat island urban morphology three-dimensional city model geographic information system.
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Geostrophic meridional transport in tropical Northwest Pacific based on Argo profiles 被引量:4
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作者 张志春 袁东亮 Peter C. CHU 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2013年第3期656-664,共9页
Absolute geostrophic currents in the North Pacific Ocean were calculated using P-vector method from newly gridded Argo profiling float data collected during 2004-2009. The meridional volume transport of geostrophic cu... Absolute geostrophic currents in the North Pacific Ocean were calculated using P-vector method from newly gridded Argo profiling float data collected during 2004-2009. The meridional volume transport of geostrophic currents differed significantly from the classical Sverdrup balance, with differences of 10×106 -20×106 m3 /s in the interior tropical Northwest Pacific Ocean. Analyses showed that errors of wind stress estimation could not explain all of the differences. The largest differences were found in the areas immediately north and south of the bifurcation latitude of the North Equatorial Current west of the dateline, and in the recirculation area of the Kuroshio and its extension, where nonlinear eddy activities were robust. Comparison of the geostrophic meridional transport and the wind-driven Sverdrup meridional transport in a high-resolution OFES simulation showed that nonlinear effects of the ocean circulation were the most likely reason for the differences. It is therefore suggested that the linear, steady wind-driven dynamics of the Sverdrup theory cannot completely explain the meridional transport of the interior circulation of the tropical Northwest Pacific Ocean. 展开更多
关键词 Sverdrup theory absolute geostrophic: current P-vector
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Temperature distribution of boron-manganese sheet metal blank by induction heating in application for hot stamping
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作者 Xu Ya Liu Peixing +1 位作者 Wang Zijian Zhang Yisheng 《Engineering Sciences》 EI 2014年第5期21-27,共7页
In order to speed up the production and save more energy in hot stamping process,the induction heating technology as a new effective heating method is considerable.Finite element(FE)-simulation and a series of experim... In order to speed up the production and save more energy in hot stamping process,the induction heating technology as a new effective heating method is considerable.Finite element(FE)-simulation and a series of experiments are carried out to research the temperature homogenization of induction heating with the face inductor.It is found the edge effect has a notable influence on the temperature distribution.Results concerning the mechanical properties of the stamped part as well as surface characteristics will be presented and discussed. 展开更多
关键词 telnperature distribution boron-manganese sheet induction heating hot stamping
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Solvothermal Route to Prepare the Metastable Phase 3c-Fe_7S_8 with Hexagonal Platelet Morphology
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作者 Xian Yun +3 位作者 XU Xiao Guang LI 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第1期83-86,共4页
The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron mi... The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology. 展开更多
关键词 c-Fe_7S_8 solvothermal route hexagonal platelet.
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Motion Track Modeling and Analysis of Belt Spindle under Combined Effects of Bending Moment-Torque-Thermal Deformation 被引量:1
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作者 齐向阳 高卫国 +2 位作者 刘腾 张大卫 Mao Ken 《Transactions of Tianjin University》 EI CAS 2015年第3期209-215,共7页
The motion track of belt spindle is important for the radial error of belt spindle. An analytical modeling method for the motion track of belt spindle under the combined effects of bending moment-torque-thermal deform... The motion track of belt spindle is important for the radial error of belt spindle. An analytical modeling method for the motion track of belt spindle under the combined effects of bending moment-torque-thermal deformation is proposed in this paper. Three running phases of belt spindle have been analyzed and modeled: the start-up phase with leaping change due to the change in force and bending moment, the accelerating phase with axis deflection, and the constant speed phase with axis regression because of the combined effects of bending moment-torque-thermal deformation. The simulation and test were completed on the belt spindle of SKVM850 machine tool, which illustrates the variation law of the radial error of belt spindle during the whole running phases. 展开更多
关键词 belt spindle TORQUE MOMENT thermal deformation DEFLECTION regression
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MHD mixed convective stagnation-point flow of Eyring-Powell nanofluid over stretching cylinder with thermal slip conditions 被引量:1
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作者 Hammed Abiodun OGUNSEYE Precious SIBANDA Hiranmoy MONDAL 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第5期1172-1183,共12页
The optimal design of heating and cooling systems must take into account heat radiation which is a non-linear process.In this study,the mixed convection in a radiative magnetohydrodynamic Eyring-Powell copperwater nan... The optimal design of heating and cooling systems must take into account heat radiation which is a non-linear process.In this study,the mixed convection in a radiative magnetohydrodynamic Eyring-Powell copperwater nanofluid over a stretching cylinder was investigated.The energy balance is modeled,taking into account the non-linear thermal radiation and a thermal slip condition.The effects of the embedded flow parameters on the fluid properties,as well as on the skin friction coefficient and heat transfer rate,are analyzed.Unlike in many existing studies,the recent spectral quasi-linearization method is used to solve the coupled nonlinear boundary-value problem.The computational result shows that increasing the nanoparticle volume fraction,thermal radiation parameter and heat generation parameter enhances temperature profile.We found that the velocity slip parameter and the fluid material parameter enhance the skin friction.A comparison of the current numerical results with existing literature for some limiting cases shows excellent agreement. 展开更多
关键词 Eyring-Powell model stretching cylinder NANOFLUID thermal radiation slip effects spectral quasi-linearization method
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Specific Heat and Magnetic Susceptibility of Graphene:A Renormalization Group Study
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作者 何培松 吴成真 +1 位作者 陈宇 田光善 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第11期897-907,共11页
In the present paper, we study effect of the long-range Coulomb interaction on the thermodynamic propertiesof graphene by renormalization group methods.Our calculations show that both the specific heat and the magneti... In the present paper, we study effect of the long-range Coulomb interaction on the thermodynamic propertiesof graphene by renormalization group methods.Our calculations show that both the specific heat and the magneticsusceptibility of the material behave differently from the Landau Fermi liquid.More precisely, we find that thesequantities are logarithmically suppressed with respect to its noninteracting counterpart when temperature is low. 展开更多
关键词 GRAPHENE quantum phase transition renormalization group
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Large electrocaloric effect in BaTiO_3 based multilayer ceramic capacitors 被引量:3
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作者 LU Biao WEN XinHua +8 位作者 TANG ZhenHua LIANG Bo TAO Tao XIE ZhiWei ZHANG TianFu TANG XinGui XIANG Yong LIAO Jie LU ShengGuo 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第7期1054-1058,共5页
The electrocaloric effect(ECE) of multilayer ceramic capacitor(MLCC) of Y5 V type was directly measured via a differential scanning calorimetry(DSC) method and a reference resistor was used to calibrate the heat flow ... The electrocaloric effect(ECE) of multilayer ceramic capacitor(MLCC) of Y5 V type was directly measured via a differential scanning calorimetry(DSC) method and a reference resistor was used to calibrate the heat flow due to the heat dissipation. The results are compared with those calculated from Maxwell relations by using the polarization data obtained from the polarization–electric field hysteresis loops. The direct method shows a larger ECE temperature change, which is accounted for the situation approaches an ideal condition. For the indirect method using Maxwell relations, only the polarization projection along the electric field was taken into account, which will be less than the randomly distributed real polarizations that contribute to the ECE. The MLCCs exhibit a broad peak of ECE around 80 C, which will be favorite for the practical ECE cooling devices. 展开更多
关键词 multilayer ceramic capacitors maxwell relations electrocaloric effect polarization–electric field hysteresis loop differential scanning calorimetry
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Momentum-space imaging spectroscopy for the study of nanophotonic materials 被引量:3
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作者 Yiwen Zhang Maoxiong Zhao +12 位作者 Jiajun Wang Wenzhe Liu Bo Wang Songting Hu Guopeng Lu Ang Chen Jing Cui Weiyi Zhang Chia Wei Hsu Xiaohan Liu Lei Shi Haiwei Yin Jian Zi 《Science Bulletin》 SCIE EI CSCD 2021年第8期824-838,M0004,共16页
The novel phenomena in nanophotonic materials, such as the angle-dependent reflection and negative refraction effect, are closely related to the photonic dispersions EepT. EepT describes the relation between energy E ... The novel phenomena in nanophotonic materials, such as the angle-dependent reflection and negative refraction effect, are closely related to the photonic dispersions EepT. EepT describes the relation between energy E and momentum p of photonic eigenmodes, and essentially determines the optical properties of materials. As EepT is defined in momentum space(k-space), the experimental method to detect the energy distribution, that is the spectrum, in a momentum-resolved manner is highly required. In this review, the momentum-space imaging spectroscopy(MSIS) system is presented, which can directly study the spectral information in momentum space. Using the MSIS system, the photonic dispersion can be captured in one shot with high energy and momentum resolution. From the experimental momentumresolved spectrum data, other key features of photonic eigenmodes, such as quality factors and polarization states, can also be extracted through the post-processing algorithm based on the coupled mode theory. In addition, the interference configurations of the MSIS system enable the measurement of coherence properties and phase information of nanophotonic materials, which is important for the study of light-matter interaction and beam shaping with nanostructures. The MSIS system can give the comprehensive information of nanophotonic materials, and is greatly useful for the study of novel photonic phenomena and the development of nanophotonic technologies. 展开更多
关键词 Momentum space imaging Nanophotonic material Photonic dispersion Photonic eigenmode Quality factor Polarization state
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Influence of thermal effects on elastohydrodynamic(EHD) lubrication behavior at high speeds 被引量:3
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作者 LIANG He GUO Dan +2 位作者 REDDYHOFF Tom SPIKES Hugh LUO Jian Bin 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第3期551-558,共8页
This paper describes a study of point contact elastohydrodynamic(EHD)lubrication behavior at high speeds(up to 20 m s1).Central film thicknesses were measured by optical interferometry device.The influence of slide-ro... This paper describes a study of point contact elastohydrodynamic(EHD)lubrication behavior at high speeds(up to 20 m s1).Central film thicknesses were measured by optical interferometry device.The influence of slide-roll ratio and operating temperature on the central film thickness was determined.The influence of thermal effects on the reduction of film thickness was discussed via the analysis of numerical simulation method considering thermal effects.Subsequently,the experimental data was used to amend a set of unified parameters for the thermal corrections for different types of oil at high speeds. 展开更多
关键词 EHD lubrication at high speeds thermal effects thermal correction factor
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Non-thermal radiation heating synthesis of nanomaterials
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作者 Guowei Xiong Jin Jia +4 位作者 Lili Zhao Xiaoyan Liu Xiaoli Zhang Hong Liu Weijia Zhou 《Science Bulletin》 SCIE EI CSCD 2021年第4期386-406,M0004,共22页
The nanoscale effect enables the unique magnetic,optical,thermal and electrical properties of nanostructured materials and has attracted extensive investigation for applications in catalysis,biomedicine,sensors,and en... The nanoscale effect enables the unique magnetic,optical,thermal and electrical properties of nanostructured materials and has attracted extensive investigation for applications in catalysis,biomedicine,sensors,and energy storage and conversion.The widely used synthesis methods,such as traditional hydrothermal reaction and calcination,are bulk heating processes based on thermal radiation.Differing from traditional heating methods,non-thermal radiation heating technique is a local heating mode.In this regard,this review summarizes various non-thermal radiation heating methods for synthesis of nanomaterials,including microwave heating,induction heating,Joule heating,laser heating and electron beam heating.The advantages and disadvantages of these non-thermal radiation heating methods for the synthesis of nanomaterials are compared and discussed.Finally,the future development and challenges of non-thermal radiation heating method for potential synthesis of nanomaterials are discussed. 展开更多
关键词 Synthesis of nanomaterials Microwave heating Induction heating Joule heating Laser heating
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Light-triggered plasmonic vesicles with enhanced catalytic activity of glucose oxidase for programmable photothermal/starvation therapy
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作者 Zhuoting Deng Yaling He +5 位作者 Muhammad Rizwan Younis Shan Lei Chao Jiang Yanyan Yuan Peng Huang Jing Lin 《Science China Materials》 SCIE EI CAS CSCD 2021年第5期1291-1301,共11页
Glucose oxidase(GOx)-based nanotheranostic agents hold great promise in tumor starvation and its synergistic therapy. Self-assembled plasmonic gold vesicles(GVs) with unique optical properties, large hollow cavity, an... Glucose oxidase(GOx)-based nanotheranostic agents hold great promise in tumor starvation and its synergistic therapy. Self-assembled plasmonic gold vesicles(GVs) with unique optical properties, large hollow cavity, and strong localized surface plasmon resonance, can be used as multi-functional nanocarriers for synergistic therapy. Herein,GOx-loaded GVs(GV-GOx) were developed for light-triggered GOx release as well as enhanced catalytic activity of GOx, achieving programmable photothermal/starvation therapy. Under near-infrared laser irradiation, the GV-GOx generated strong localized hyperthermia due to plasmon coupling effect of GVs, promoting the release of encapsulated GOx and increasing its catalytic activity, resulting in enhanced tumor starvation effect. In addition, the high photothermal effect improved the cellular uptake of GV-GOx and allowed an efficient monitoring of synergistic tumor treatment via photoacoustic/photothermal duplex imaging in vivo. Impressively, the synergistic photothermal/starvation therapy demonstrated complete tumor eradication in 4 T1 tumorbearing mice, verifying superior synergistic anti-tumor therapeutic effects than monotherapy with no apparent systemic side effects. Our work demonstrated the development of a light-triggered nanoplatform for cancer synergistic therapy. 展开更多
关键词 light-triggered release plasmonic vesicles glucose oxidase photothermal therapy starvation therapy
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