期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到267篇文章
< 1 2 … 14 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
A water probe for direct pH measurement of individual particles via micro-Raman spectroscopy 认领 引用
1
作者 Xiaoyu Cui Mingjin Tang Tong Zhu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第3期200-208,共9页
The acidity of atmospheric aerosols influences fundamental physicochemical processes that affect climate and human health.We recently developed a novel and facilewater-probebased method for directly measuring of the p... The acidity of atmospheric aerosols influences fundamental physicochemical processes that affect climate and human health.We recently developed a novel and facilewater-probebased method for directly measuring of the pH for micrometer-size droplets,providing a promising technique to better understand aerosol acidity in the atmosphere.The complex chemical composition of fine particles in the ambient air,however,poses certain challenges to using a water-probe for pH measurement,including interference from interactions between compositions and the influence of similar compositions on water structure.To explore the universality of our method,it was employed to measure the pH of ammonium,nitrate,carbonate,sulfate,and chloride particles.The pH of particles covering a broad range(0–14)were accurately determined,thereby demonstrating that our method can be generally applied,even to alkaline particles.Furthermore,a standard spectral library was developed by integrating the standard spectra of common hydrated ions extracted through the waterprobe.The library can be employed to identify particle composition and overcome the spectral overlap problem resulting from similar effects.Using the spectral library,all ions were identified and their concentrations were determined,in turn allowing successful pH measurement of multicomponent(ammonium-sulfate-nitrate-chloride)particles.Insights into the synergistic effect of Cl–,NO3–,and NH4+depletion obtained with our approach revealed the interplay between pH and volatile partitioning.Given the ubiquity of component partitioning and pH variation in particles,the water probemay provide a new perspective on the underlying mechanisms of aerosol aging and aerosol–cloud interaction. 展开更多
关键词 Particle pH Water probe Standard spectral library Micro-Raman spectroscopy Direct measurement
暂未订购 下载PDF
Measurement of residual stress in a multi-layer semiconductor heterostructure by micro-Raman spectroscopy 认领 引用 被引量：18
2
作者 Wei Qiu Cui-Li Cheng +7 位作者 Ren-Rong Liang Chun-Wang Zhao Zhen-Kun Lei Yu-Cheng Zhao Lu-Lu Ma Jun Xu Hua-Jun Fang Yi-Lan Kang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2016年第5期805-812,共8页
Si-based multilayer structures are widely used in current microelectronics. During their preparation, some inhomogeneous residual stress is induced, resulting in competition between interface mismatching and surface e... Si-based multilayer structures are widely used in current microelectronics. During their preparation, some inhomogeneous residual stress is induced, resulting in competition between interface mismatching and surface energy and even leading to structure failure. This work presents a methodological study on the measurement of residual stress in a multi-layer semiconductor heterostructure. Scanning electron microscopy（SEM）, micro-Raman spectroscopy（MRS）, and transmission electron microscopy（TEM） were applied to measure the geometric parameters of the multilayer structure. The relationship between the Raman spectrum and the stress/strain on the [100] and [110] crystal orientations was determined to enable surface and crosssection residual stress analyses, respectively. Based on the Raman mapping results, the distribution of residual stress along the depth of the multi-layer heterostructure was successfully obtained. 展开更多
关键词 Residual stress Multi-layer semiconductor heterostructure Micro-Raman spectroscopy（MRS） Strained silicon Germanium silicon
暂未订购 下载PDF
中煤级煤Micro-Raman结构对甲烷吸附的响应 认领 引用 被引量：2
3
作者 陈小珍 李美芬 曾凡桂 《煤炭学报》 EI CAS CSCD 北大核心 2022年第7期2678-2686,共9页
煤与甲烷、二氧化碳等流体作用后的体积膨胀及其机制一直是煤层气地质学和煤与瓦斯突出防治研究中的重要课题之一。以往的研究主要集中在宏观吸附膨胀及变形,并从力学的角度解释其膨胀机制。实际上,煤作为由大分子构成的分子体系,与甲... 煤与甲烷、二氧化碳等流体作用后的体积膨胀及其机制一直是煤层气地质学和煤与瓦斯突出防治研究中的重要课题之一。以往的研究主要集中在宏观吸附膨胀及变形,并从力学的角度解释其膨胀机制。实际上,煤作为由大分子构成的分子体系,与甲烷、二氧化碳的相互作用是一种分子现象,其膨胀变形的本质应该是分子体系发生了变化,因此揭示煤大分子结构对煤体吸附膨胀的响应特征是认识其机制的基础。应用显微-拉曼光谱法对吸附甲烷前后的8个中煤级煤样(镜质组最大反射率Ro=1.08%~1.80%)进行了结构表征,并运用Origin 8.5软件对煤样吸附甲烷前后的拉曼光谱曲线进行了分峰拟合,在此基础上计算了煤样吸附前后的拉曼光谱结构参数。结果表明:原煤和吸附煤的G峰与D峰的峰位差d(G-D)随着煤级的增加有增大趋势,G峰半峰宽(FWHM-G)呈减小趋势,表明在反射率1.08%~1.80%阶段,煤结构有序度和微晶尺寸随煤级增加而逐渐增加;大芳香环(≥6)的相对含量(AD/AG)出现先增加后减小的趋势,这是以较大芳香环的生成为主转为向石墨结构生成为主的结果;随着煤级增加,原煤的大芳香环结构中“杂质”(AS/AD)及氢化芳环上的C—C的含量(AS/Atotal)均有减小的趋势,反映出煤结构中sp2-sp3杂化烷基碳或氢化芳环逐渐减少,有序度逐渐增加;当Ro>1.3%时,吸附煤相对原煤的d(G-D)及AD/AG减少,小芳香环相对含量(AGR+VR+VL/AD),AS/AD,AS/Atotal和FWHM-G增加,表明甲烷吸附变形引起环数较大的芳香环和微晶结构破裂形成较小的芳香环。这一结果对于认识煤大分子结构与甲烷的相互作用机制提供了理论依据。 展开更多
关键词 Micro-Raman 吸附变形 结构演化 中煤级煤 西山煤田
暂未订购 下载PDF
A polarized micro-Raman study of a 0.65PbMg1/3Nb2/3O_3-0.35PbTiO_3 single crystal 认领 引用 被引量：2
4
作者 Zhang Li-Yan Zhu Ke Liu Yu-Long 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第1期482-487,共6页
Polarized micro-Raman spectra of a 0.65PbMgl/3Nb2/303 0.35PbTiO3 （0.65PMN-0.35PT） single crystal poled in the [001] direction are obtained in a wide frequency range （50 2000 cm^-1） at different temperatures. The b... Polarized micro-Raman spectra of a 0.65PbMgl/3Nb2/303 0.35PbTiO3 （0.65PMN-0.35PT） single crystal poled in the [001] direction are obtained in a wide frequency range （50 2000 cm^-1） at different temperatures. The best fit to the Raman spectrum at 77 K is achieved using 17 Lorenzians to convolute into it, and this is proved to be a reasonable fit. According to the group theory and selection rules of overtone and combinational modes, apart from the seven Raman modes that are from first-order Raman scattering, the remaining ones are attributed to being from second-order Raman scattering. A comparison between the experimental results and theoretical predictions shows that they are in satisfactory agreement with each other. Our results indicate that at 77 K the sample belongs to the rhombohedral symmetry with the C^53v（R3m） space group （Z = 1）. In our study, on heating, the 0.65PMN 0.35PT single crystal undergoes a rhombohedral → tetragonal → cubic phase transition sequence. The two phase transitions occur at 340 and 440 K, which correspond to the disappearance of the soft mode near 106 cm-1 recorded in VV polarization and the vanishing of the band around 780 cm^-1 in VH polarization, respectively. 展开更多
关键词 0.65PMN-0.35PT, polarized micro-Raman second-order Raman scattering, phase tran-sition
暂未订购 下载PDF
Development of in-situ Micro-Raman spectroscopy system for autoclave experimental apparatus 认领 引用 被引量：1
5
作者 Lin Chen Heping Li +3 位作者 Shengbin Li Liping Xu Sen Lin Hongbin Zhou 《Acta Geochimica》 EI CAS CSCD 2020年第4期445-450,共6页
We developed a set of in-situ Micro-Raman spectroscopy system for autoclave experimental apparatus because of the scientific significance of in-situ Micro-Raman spectroscopy system under the high-pressure hydrothermal... We developed a set of in-situ Micro-Raman spectroscopy system for autoclave experimental apparatus because of the scientific significance of in-situ Micro-Raman spectroscopy system under the high-pressure hydrothermal condition.We used this system to measure the Raman spectrum of water-fluid and quartz crystal at the temperature ranging from 125 to 420℃.The signal-tonoise ratio of the Raman signal is good. 展开更多
关键词 Micro-raman Hydrothermal system In-situ Autoclave
暂未订购 下载PDF
Comparison between Double Crystals X-ray Diffraction and Micro-Raman Measurement on Composition Determination of High Ge Content Si1-xGex Layer Epitaxied on Si Substrate 认领 引用 被引量：1
6
作者 Lei ZHAO Yuhua ZUO Buwen CHENG Jinzhong YU Qiming WANG 《Journal of Materials Science & Technology》 SCIE EI CAS 2006年第5期651-654,共4页
It is important to acquire the composition of Si1-xGex layer, especially that with high Ge content, epitaxied on Si substrate. Two nondestructive examination methods, double crystals X-ray diffraction （DCXRD） and mi... It is important to acquire the composition of Si1-xGex layer, especially that with high Ge content, epitaxied on Si substrate. Two nondestructive examination methods, double crystals X-ray diffraction （DCXRD） and micro-Raman measurement, were introduced comparatively to determine x value in Si1-xGex layer, which show that while the two methods are consistent with each other when x is low, the results obtained from double crystals X-ray diffraction are not credible due to the large strain relaxation occurring in Si1-xGex layers when Ge content is higher than about 20%. Micro-Raman measurement is more appropriate for determining high Ge content than DCXRD. 展开更多
关键词 Si1-xGex Ge content Composition determination Double crystals X-ray diffraction （DCXRD） Micro-Raman measurement
暂未订购 下载PDF
Low-energy(40 keV)proton irradiation of YBa2Cu3O7-xthin films:Micro-Raman characterization and electrical transport properties 认领 引用
7
作者 San-Sheng Wang Fang Li +8 位作者 Han Wu Yu Zhang Suleman Muhammad Peng Zhao Xiao-Yun Le Zhi-Song Xiao Li-Xiang Jiang Xue-Dong Ou Xiao-Ping Ouyang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第2期406-413,共8页
To investigate the damage profiles of high-fluence low-energy proton irradiation on superconducting materials and related devices,Raman characterization and electrical transport measurement of 40-keV-proton irradiated... To investigate the damage profiles of high-fluence low-energy proton irradiation on superconducting materials and related devices,Raman characterization and electrical transport measurement of 40-keV-proton irradiated YBa2Cu3O7-x(YBCO)thin films are carried out.From micro-Raman spectroscopy and x-ray diffraction studies,the main component of proton-radiation-induced defects is found to be the partial transition of superconducting orthorhombic phase to the semiconducting tetragonal phase and non-superconducting secondary phase.The results indicate that the defects induced in the conducting CuO2 planes,such as increased oxygen vacancies and interstitials,can result in an increase in the resistivity but a decrease in the transition temperature TCwith the increase in the fluence of proton irradiation,which is confirmed in the electrical transport measurements.Especially,zero-resistance temperature TC0 is not observed at a fluence of 1015p/cm2.Furthermore,the variation of activation energy U0 can be explained by the plastic-flux creep theory,which indicates that the plastic deformation and entanglement of vortices in a weakly pinned vortex liquid are caused by disorders of point-like defects.Point-like disorders are demonstrated to be the main contribution to the low-energy proton radiation damage in YBCO thin films.These disorders are likely to cause flux creep by thermally assisted flux flow,which may increase noise and reduce the precision of superconducting devices. 展开更多
关键词 superconductors proton radiation micro-Raman spectra electrical transport
暂未订购 下载PDF
Using X-ray computed tomography and micro-Raman spectrometry to measure individual particle surface area, volume, and morphology towards investigating atmospheric heterogeneous reactions 认领 引用 被引量：1
8
作者 Mingjin Wang Nan Zheng +6 位作者 Tong Zhu Jing Shang Ting Yu Xiaojuan Song Defeng Zhao Yong Guan Yangchao Tian 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第7期23-32,共10页
Heterogeneous reactions on the aerosol particle surface in the atmosphere play important roles in air pollution, climate change, and global biogeochemical cycles. However, the reported uptake coefficients of heterogen... Heterogeneous reactions on the aerosol particle surface in the atmosphere play important roles in air pollution, climate change, and global biogeochemical cycles. However, the reported uptake coefficients of heterogeneous reactions usually have large variations and may not be relevant to real atmospheric conditions. One of the major reasons for this is the use of bulk samples in laboratory experiments, while particles in the atmosphere are suspended individually. A number of technologies have been developed recently to study heterogeneous reactions on the surfaces of individual particles. Precise measurements on the reactive surface area, volume, and morphology of individual particles are necessary for calculating the uptake coefficient, quantifying reactants and products, and understanding the reaction mechanism better. In this study, for the first time we used synchrotron radiation X-ray computed tomography（XCT） and micro-Raman spectrometry to measure individual CaCO_3 particle morphology, with sizes ranging from 3.5–6.5 μm. Particle surface area and volume were calculated using a reconstruction method based on software threedimensional（3-D） rendering. The XCT was first validated with high-resolution fieldemission scanning electron microscopy（FE-SEM） to acquire accurate CaCO_3 particle surface area and volume estimates. Our results showed an average difference of only 6.1% in surface area and 3.2% in volume measured either by micro-Raman spectrometry or X-ray tomography. X-ray tomography and FE-SEM can provide more morphological details of individual Ca CO3 particles than micro-Raman spectrometry. This study demonstrated that X-ray computed tomography and micro-Raman spectrometry can precisely measure the surface area, volume, and morphology of an individual particle. 展开更多
关键词 Heterogeneous reactions Individual CaCO3 particle Micro-Raman spectrometry Synchrotron radiation X-ray computed tomography Morphology Surface area Volume
暂未订购 下载PDF
Study of Thermal Conductivity of Porous Silicon Using the Micro-Raman Method 认领 引用
9
作者 Amaria Ould-Abbas Mama Bouchaour Nasr-Eddine Chabane Sari 《Open Journal of Physical Chemistry》 2012年第1期1-6,共6页
In this work, we are interesting in the measurement of thermal conductivity (on the surface and in-depth) of Porous silicon by the micro-Raman spectroscopy. This direct method (micro-Raman spectroscopy) enabled us to ... In this work, we are interesting in the measurement of thermal conductivity (on the surface and in-depth) of Porous silicon by the micro-Raman spectroscopy. This direct method (micro-Raman spectroscopy) enabled us to develop a systematic means of investigation of the morphology and the thermal conductivity of Porous silicon oxidized or no. The thermal conductivity is studied according to the parameters of anodization and fraction of silicon oxidized. Thermal transport in the porous silicon layers is limited by its porous nature and the blocking of transport in the silicon skeleton what supports its use in the thermal sensors. 展开更多
关键词 Mono-Crystal Silicon Porous Silicon Thermal Conductivity Micro-Raman Spectroscopy
暂未订购 下载PDF
Micro-Raman and SEM Analysis of Minerals from the Darhib Mine, Egypt 认领 引用
10
作者 Giuliana Gatto Rotondo Larysa Darchuk +1 位作者 Marcel Swaenen René Van Grieken 《Journal of Analytical Sciences, Methods and Instrumentation》 2012年第1期42-47,共6页
The Darhib mine is one of the several talc deposits in the Hamata area of southeastern Egypt. Several specimens of minerals coming from this mine were subjected to complementary investigation by micro-Raman spectromet... The Darhib mine is one of the several talc deposits in the Hamata area of southeastern Egypt. Several specimens of minerals coming from this mine were subjected to complementary investigation by micro-Raman spectrometry and scanning electron microscopy. The difficulty in their identification is the appearance of most of them: they are all very small and only visible under the mineral binocular microscope(×10 - ×40). They appear as small crystals in fissures and holes and a visual determination on colour and crystal gives only a guess of what kind of mineral it could be. Therefore, only after analyzing them by micro-Raman and scanning electron microscopy it was possible to identify their structure and they can be divided in three main groups: one is quite generic and several minerals of different species were identified, such as quartz, talc, mottramite and chrysocolla, very common in the talc mine (these ones are Si-based minerals);the other one is constituted by four samples which are Zn and/or Cu rich, which means minerals of the rosasite or aurichalcite groups;the last group is constituted by two samples containing mainly Pb.. 展开更多
关键词 Minerals Micro-Raman SEM Talc Mines
暂未订购 下载PDF
不同煤级煤纳米力学性能的Micro-Raman结构响应 认领 引用 被引量：4
11
作者 韩雅婷 孙蓓蕾 《煤矿安全》 CAS 北大核心 2022年第11期7-14,共8页
煤的力学性质具有非均质性及多尺度效应,从纳米尺度认识煤力学性质及与其组成结构之间的关系,是理解煤储层的压裂改造机制及裂纹扩展机理的关键。利用原子力显微镜和显微拉曼对不同煤级煤的镜质组进行测试,获得煤样的力学和结构参数。... 煤的力学性质具有非均质性及多尺度效应,从纳米尺度认识煤力学性质及与其组成结构之间的关系,是理解煤储层的压裂改造机制及裂纹扩展机理的关键。利用原子力显微镜和显微拉曼对不同煤级煤的镜质组进行测试,获得煤样的力学和结构参数。结果表明:镜质组的弹性模量E在0.66~7.58 GPa之间,且弹性模量随镜质组最大反射率Ro的增加而增加;同时随着Ro的增大,拉曼结构参数呈现有规律的变化;将弹性模量E与拉曼结构参数建立关系,发现(G-D)峰位差、多环芳烃的相对含量与致弹性模量均呈现明显的正相关关系,FWHM-G与E呈现负相关关系,反映了结构有序度的增加会导致弹性模量增大,表明随着成熟度的增加,促使大分子结构排列紧密且分子间作用力增大,导致弹性模量也随之增大。 展开更多
关键词 煤储层压裂 煤结构 原子力显微镜 显微拉曼 纳米力学性能
暂未订购 下载PDF
Multi-point scanning Raman spectroscopy analysis of evolution of carbon structure and inherent minerals of metallurgical coke during heating process 认领 引用
12
作者 Ya-Qi Gao Chong Zou +2 位作者 Yuan She Zheng-Yan Huang Jia-Yao Qin 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期380-396,共17页
The complexity of the internal environment of a blast furnace has limited the exploration of the microscopic reaction mechanisms of metallurgical coke.Some of the traditional detection methods often focus on average v... The complexity of the internal environment of a blast furnace has limited the exploration of the microscopic reaction mechanisms of metallurgical coke.Some of the traditional detection methods often focus on average value,neglecting the structural heterogeneity of coke.The changes of coke in a CO2 atmosphere at temperatures ranging from 1000 to 1500℃ were investigated using multi-point micro-Raman spectroscopy.The results indicate that,with the increasing temperature,the defect-related parameters of two tested samples decreased by 63.8%and 39.2%,respectively.The interlayer spacing of graphite and the thickness of microcrystalline stacking demonstrate a linear correlation with the Raman defect index,thus offering a precise approach for monitoring the graphitization process.Surface scanning micro-Raman spectroscopy indicated that minerals experienced dynamic migration,which was characterized by an“increase-decrease-increase”pattern.Moreover,in comparison with single-point detection,the quantity of surface scanning sampling increased.Simultaneously,the variance rose from 0.097 to 0.499,which reflects the authenticity of the samples.Finally,the changes of carbon structure and inherent mineral content and distribution are visually revealed by mapping method.This method effectively provides a high-resolution microstructural scale for the quality evaluation of blast furnace coke. 展开更多
关键词 Blast furnace Micro-Raman spectroscopy Coke Mineral Mapping
暂未订购 下载PDF
青檀韧皮纤维生长过程中细胞壁化学组分与力学性能变化 认领 引用 被引量：1
13
作者 陈佳慧 韩自婵 +1 位作者 陈冰炜 翟胜丞 《林业工程学报》 CAS CSCD 北大核心 2026年第3期86-93,共8页
以我国特有树种青檀(Pteroceltis tatarinowii)为研究对象,研究生长过程中树皮中韧皮纤维细胞壁的理化性能变化。通过光学显微镜观察、显微拉曼分析和纳米压痕试验研究青檀形成层活动周期,比较生长发育过程中青檀韧皮纤维细胞壁化学成... 以我国特有树种青檀(Pteroceltis tatarinowii)为研究对象,研究生长过程中树皮中韧皮纤维细胞壁的理化性能变化。通过光学显微镜观察、显微拉曼分析和纳米压痕试验研究青檀形成层活动周期,比较生长发育过程中青檀韧皮纤维细胞壁化学成分与力学性能变化规律。结果表明,3月初,青檀形成层已经恢复细胞分裂活动,韧皮部母细胞开始分生活动早于木质部母细胞;4—7月,形成层处于分生活跃期;8月,形成层进入过渡期。青檀韧皮纤维具有胶质层。显微拉曼成像结果显示,韧皮纤维生长发育过程中,碳水化合物在胶质层不断积累以使细胞壁增厚,木质素首先在细胞角隅处沉积,胶质层中几乎没有木质素的拉曼信号。纳米压痕微区力学性能研究结果显示,青檀韧皮纤维细胞壁弹性模量呈现先增大后趋于平稳的变化趋势,细胞壁弹性模量和硬度值分别为(15.36±3.05)和(0.56±0.08)GPa。研究结果有助于深入理解青檀树皮发育过程中韧皮纤维性能的演化,为纤维原料采集及高值化利用提供理论依据。 展开更多
关键词 青檀 韧皮纤维 细胞壁 显微拉曼 纳米压痕
暂未订购 下载PDF
Investigation on the laser ablation of SiC ceramics using micro-Raman mapping technique 认领 引用 被引量：4
14
作者 Chaoli FU Yong YANG +5 位作者 Zhengren HUANG Guiling LIU Hui ZHANG Fang JIANG Yuquan WEI Zheng JIAO 《Journal of Advanced Ceramics》 SCIE EI CAS 2016年第3期253-261,共9页
Research on the laser ablation behavior of SiC ceramics has great significance for the improvement of their anti-laser ability as high-performance mirrors in space and lasers,or the laser surface micro-machining techn... Research on the laser ablation behavior of SiC ceramics has great significance for the improvement of their anti-laser ability as high-performance mirrors in space and lasers,or the laser surface micro-machining technology as electronic components in micro-electron mechanical systems(MEMS).In this work,the laser ablation of SiC ceramics has been performed by using laser pulses of 12 ns duration at 1064 nm.The laser induced damage threshold(LIDT)below 0.1 J/cm(2)was obtained by 1-on-1 mode and its damage morphology appeared in the form of'burning crater'with a clear boundary.Micro-Raman mapping technique was first introduced in our study on the laser ablation mechanisms of SiC surface by identifying physical and chemical changes between uninjured and laser-ablated areas.It has been concluded that during the ablation process,SiC surface mainly underwent decomposition to the elemental Si and C,accompanied by some transformation of crystal orientation.The oxidation of SiC also took place but only in small amount on the edges of target region,while there was no hint of SiO2 in the center with higher energy density,maybe because of deficiency of O-2 atmosphere in the ablated area,elimination of SiO2 by carbon at 1505 degrees C,or evaporating at 2230 degrees C. 展开更多
关键词 silicon carbide(SiC) laser ablation micro-Raman mapping technique decomposition oxidation
暂未订购 下载PDF
Determination of channel temperature for AlGaN/GaN HEMTs by high spectral resolution micro-Raman spectroscopy 认领 引用 被引量：2
15
作者 张光沉 冯士维 +2 位作者 李静婉 赵艳 郭春生 《Journal of Semiconductors》 EI CAS CSCD 2012年第4期42-46,共5页
Channel temperature determinations of A1GaN/GaN high electron mobility transistors （HEMTs） by high spectral resolution microRaman spectroscopy are proposed. The temperature dependence of the E2 phonon fre quency of ... Channel temperature determinations of A1GaN/GaN high electron mobility transistors （HEMTs） by high spectral resolution microRaman spectroscopy are proposed. The temperature dependence of the E2 phonon fre quency of GaN material is calibrated by using a JYT64000 microRaman system. By using the Lorentz fitting method, the measurement uncertainty for the Raman phonon frequency of 40.035 cm1 is achieved, correspond ing to a temperature accuracy of 43.2 ~C for GaN material, which is the highest temperature resolution in the published works. The thermal resistance of the tested A1GaN/GaN HEMT sample is 22.8 °C/W, which is in rea sonably good agreement with a three dimensional heat conduction simulation. The difference among the channel temperatures obtained by microRaman spectroscopy, the pulsed electrical method and the infrared image method are also investigated quantificationally. 展开更多
关键词 HEMT channel temperature micro-Raman spectroscopy
暂未订购 下载PDF
索托克拉喷雾干燥无定形固体分散体的晶相成像表征与质量评价 认领 引用
16
作者 朱绍洲 杨琳琳 +2 位作者 姚静 孙葭北 黄海伟 《中国药学杂志》 CAS CSCD 北大核心 2026年第10期1180-1189,共10页
目的利用多种成像技术对创新抗肿瘤药物索托克拉喷雾干燥无定形固体分散体进行质量评价。重点开展喷雾干燥粉末中药物无定形态与晶型态的快速成像鉴别研究,以期为同类药物的质量控制提供可行策略与理论依据。方法以索托克拉原料药、喷... 目的利用多种成像技术对创新抗肿瘤药物索托克拉喷雾干燥无定形固体分散体进行质量评价。重点开展喷雾干燥粉末中药物无定形态与晶型态的快速成像鉴别研究,以期为同类药物的质量控制提供可行策略与理论依据。方法以索托克拉原料药、喷雾干燥粉及其制剂为例,开展分析方法学开发,利用红外光谱、共聚焦显微拉曼光谱成像和扫描电子显微镜(SEM)等手段对其进行综合表征。结果传统红外光谱技术较难区分晶型U索托克拉原料药与无定形固体分散体,而共聚焦显微拉曼光谱成像技术及SEM则可对二者进行清晰鉴别。在拉曼谱表征中,无定形态与晶型态相比呈现出明显不同的光谱特征;采用双峰比率成像策略,可实现对喷雾干燥粉中掺杂的索托克拉晶型U的成像表征与可视化识别。此外,SEM成像也能精准识别喷雾干燥粉中掺杂的晶型U索托克拉。结论成像技术可作为评价无定形固体分散体中药物晶型转变质量的关键工具。此类方法操作简便、准确性高,适用于喷雾干燥制备的无定形固体分散体制剂的质量控制。 展开更多
关键词 索托克拉 共聚焦显微拉曼光谱成像 无定形固体分散体 喷雾干燥 扫描电子显微镜
暂未订购 下载PDF
The 2-axis stress component decoupling of {100} c-Si by using oblique backscattering micro-Raman spectroscopy 认领 引用 被引量：3
17
作者 DongHui Fu XiaoYong He +4 位作者 LuLu Ma HuaDan Xing Tian Meng Ying Chang Wei Qiu 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2020年第9期51-57,共7页
With the application of strain engineering in microelectronics,complex stress states are introduced into advanced semiconductor devices.However,there is still a lack of effective metrology for the decoupling analysis ... With the application of strain engineering in microelectronics,complex stress states are introduced into advanced semiconductor devices.However,there is still a lack of effective metrology for the decoupling analysis of the complex stress states in semiconductor materials.This paper presents an investigation on the 2-axis stress component decoupling of{100}monocrystalline silicon(c-Si)by using oblique backscattering micro-Raman spectroscopy.A spectral-mechanical model was established,and two practicable methods for actual stress decoupling analyses were proposed.The verification experiments demonstrated the correctness and applicability of the methods proposed in this paper. 展开更多
关键词 {100}c-Si stress component decoupling oblique backscattering micro-Raman spectroscopy
暂未订购 下载PDF
基于HBA-BPNN算法和显微拉曼技术的黑加仑籽油掺假量化 认领 引用 被引量：1
18
作者 王旭 任晓鸽 《粮油食品科技》 CAS CSCD 北大核心 2026年第2期199-207,共9页
黑加仑籽油作为一种高价值营养油,其掺假问题严重影响消费者信任。为实现快速、精准的掺假量化检测,本研究提出一种蜜獾优化算法(HBA)结合反向传播神经网络(BPNN)助力显微拉曼光谱的分析方法。以纯黑加仑籽油为基础,掺入不同比例廉价植... 黑加仑籽油作为一种高价值营养油,其掺假问题严重影响消费者信任。为实现快速、精准的掺假量化检测,本研究提出一种蜜獾优化算法(HBA)结合反向传播神经网络(BPNN)助力显微拉曼光谱的分析方法。以纯黑加仑籽油为基础,掺入不同比例廉价植物油制备样本,利用显微拉曼光谱无损采集分子指纹信息。针对传统BPNN易陷入局部最优和训练效率低的问题,引入HBA优化其初始权值与阈值,提升模型预测精度与泛化能力。经特征提取与筛选,建立HBA-BPNN定量模型。结果表明,该方法预测性能显著优于传统BPNN模型,预测决定系数R2高于0.95,均方根误差RMSE低于0.057,为黑加仑籽油及其他油脂的质量安全控制与掺假鉴别提供了一种高效、无损、高灵敏度的新策略。 展开更多
关键词 蜜獾优化算法 反向传播神经网络 显微拉曼光谱 掺假定量 黑加仑籽油
暂未订购 下载PDF
表面增强拉曼光谱在文物材料分析中的研究进展 认领 引用 被引量：1
19
作者 姚铭毅 张晖 《光散射学报》 北大核心 2026年第1期1-15,共15页
文物材料的精准分析是文化遗产科学保护与研究的关键。为了获取尽可能多的文物成分信息,文物科技工作者们通常采用多种方法对其进行检测和分析。鉴于文物具有珍贵性与不可再生性,表面增强拉曼光谱(Surface-Enhanced Raman Spectroscopy,... 文物材料的精准分析是文化遗产科学保护与研究的关键。为了获取尽可能多的文物成分信息,文物科技工作者们通常采用多种方法对其进行检测和分析。鉴于文物具有珍贵性与不可再生性,表面增强拉曼光谱(Surface-Enhanced Raman Spectroscopy,SERS)技术凭借其超高灵敏度、分子指纹识别能力、荧光猝灭效应及微损/无损检测优势,在文物材料分析领域展现出巨大潜力。本文综述了SERS技术在文物材料分析中的最新研究进展与应用,重点聚焦于有机染料、无机颜料、金属锈蚀产物及蛋白质四类材料的分析策略,讨论了SERS技术在文物材料分析中遇到的挑战。随着新型SERS基底、样品前处理手段和光谱数据分析方法的不断改进,SERS技术将持续为文化遗产的科学认知、真伪鉴别与保护修复提供强有力的技术支撑。 展开更多
关键词 表面增强拉曼光谱 文物分析 微损检测 纺织品文物 彩绘文物
暂未订购 下载PDF
Micro-Raman investigations on the structures of the surface and the inner of MgSO_4 droplets 认领 引用 被引量：4
20
作者 WANG Feng SHOU JingJing ZHANG YunHong 《Chinese Science Bulletin》 2008年第15期2414-2416,共3页
Spherical MgSO4 droplets were deposited by a syringe on the hydrophobic Teflon substrate. Using micro-Raman technique, the laser beam was highly focused twice on the surface and in the center of spherical droplets. Th... Spherical MgSO4 droplets were deposited by a syringe on the hydrophobic Teflon substrate. Using micro-Raman technique, the laser beam was highly focused twice on the surface and in the center of spherical droplets. The Raman spectra for the surface and the inner of MgSO4 droplets were accord-ingly obtained, suggesting formation of a thin layer of gels on MgSO4 droplets at low relative humidity. The gel layer covered the surface and exhibited a significant delay in response to the change of ambi-ent relative humidity, resulting in the structural difference between the surface and the inner of MgSO4 droplets. 展开更多
关键词 MgSO4滴液 凝胶结构 表面结构 群体传输
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 14 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈