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Photo-Induced Thermally Stimulated Depolarization Current (TSDC) in Natural and Synthetic Alexandrite (BeAl2O4:Cr3+)
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作者 Neilo Marcos Trindade Ana Regina Blak +2 位作者 Elisabeth Mateus Yoshimura Luis Vicente de Andrade Scalvi Rosa Maria Fernandes Scalvi 《Materials Sciences and Applications》 2016年第12期881-894,共14页
The investigation of electrical properties in alexandrite (BeAl<sub>2</sub>O<sub>4</sub>:Cr<sup>3+</sup>) in synthetic and natural forms is presented in this paper. Alexandrite is a... The investigation of electrical properties in alexandrite (BeAl<sub>2</sub>O<sub>4</sub>:Cr<sup>3+</sup>) in synthetic and natural forms is presented in this paper. Alexandrite is a rare and precious mineral that changes color according to the light incident on it. In the synthetic form, it is used technologically as an active laser medium. The electrical characterization was obtained using the Thermally Stimulated Depolarization Current (TSDC) technique, an interesting tool to study the behavior of impurities in insulators. Alexandrite presented the electric dipole relaxation phenomenon, both in natural and in synthetic samples. It was possible to observe TSDC bands for the synthetic sample at around 170 K, and at around 175 K for the natural sample. Besides, photo-induced TSDC measurements were performed through the excitement of the samples by using a continuous wave argon laser. In addition, photoluminescence measurements were performed to verify in advance whether the laser light would be absorbed by the sample, and in order to complement the photo-induced TSDC measurements analysis. The results of photo-induced TSDC experiments have contributed to the understanding of the TSDC bands behavior: the results obtained with the technique suggest that there is an effective participation of Cr<sup>3+</sup> ions in the formation of TSDC bands because they were more intense when the sample was exposed to the argon laser beam. 展开更多
关键词 ALEXANDRITE Chrysoberyl thermally stimulated Depolarization Current (TSDC) PHOTOLUMINESCENCE Photo-Induced
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掺铒硫化锌ACTFEL中深能级的测定 被引量:2
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作者 陈振湘 孙书农 刘瑞堂 《厦门大学学报(自然科学版)》 CAS 1988年第1期59-63,共5页
采用热激电流(TSC)法,在180-430K温度内对三种不同结构的ZnS:Er^(3+)交流薄膜电致发光(ACTFEL)样品,测得三个热激电流峰.经分析认为它们对应于ZnS:Er^(3+)层体内,ZnS:Er^(3+) Y_2O_3和ZnS:Er^(3+)-SnO_2界面处存在的不同深度的陷阱能级... 采用热激电流(TSC)法,在180-430K温度内对三种不同结构的ZnS:Er^(3+)交流薄膜电致发光(ACTFEL)样品,测得三个热激电流峰.经分析认为它们对应于ZnS:Er^(3+)层体内,ZnS:Er^(3+) Y_2O_3和ZnS:Er^(3+)-SnO_2界面处存在的不同深度的陷阱能级.估算其位置和密度,并讨论了实验结果. 展开更多
关键词 ELECTROLUMINESCENT thermally stimulated current Deep centers
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Effect of heating treatment on trap level distribution in polyamide 66 film electrets
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作者 徐佩 张兴元 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第3期541-544,共4页
The effect of heating treatment on the trap level distribution in polyamide 66 film electret is studied by thermally stimulated depolarization current (TSDC) technique. For annealed polyamide 66, there are three tra... The effect of heating treatment on the trap level distribution in polyamide 66 film electret is studied by thermally stimulated depolarization current (TSDC) technique. For annealed polyamide 66, there are three trap levels that respectively originate from space charge trapped in amorphous phase, interphase and crystalline phase. There is one peak that originates from space charge trapped in amorphous phase for quenched one. Using multi-point method to fit the experimental curves, the detrapping current peaks can be separated and the trap depth is obtained. The shallower trap levels trapped in amorphous phase and interphase are obviously close to the deeper trap level trapped in crystalline phase for annealed polyamide 66 as the polarization temperature increases, while the trap level distribution remains unaffected by polarization temperature for quenched one. 展开更多
关键词 polyamide 66 film electret thermally stimulated depolarization current heating treatment
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Evaluations of dielectric property and drug release profile of 5-FU patches based on plasma charged electrets
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作者 苑旺 梁合鹃 +3 位作者 黄平 安晓强 江键 崔黎丽 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第5期110-116,共7页
In the present study,the electret 5-fluorouracil patch was developed,the effective surface potential,piezoelectric coefficient d33,open-circuit thermally stimulated discharge(TSD) current spectra and shear adhesion ... In the present study,the electret 5-fluorouracil patch was developed,the effective surface potential,piezoelectric coefficient d33,open-circuit thermally stimulated discharge(TSD) current spectra and shear adhesion of the patch were measured.The drug release profile of the patch was determined by using high performance liquid chromatography method.A stable potential difference which was positively dependent on the surface potential of the electret was generated on two sides of the patch.The measurements of d33 coefficient,TSD current spectra and adhesion performance showed that the electrostatic field of the electret could cause polarization and cohesive strength decreasing of the matrix molecules,change the distribution and interaction of the drug molecules in patch,therefore to increase the release of drug from the transdermal patch. 展开更多
关键词 ELECTRET hypertrophic scar thermally stimulated discharge current 5-fluorouracil patch piezoelectric coefficient
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Speed-resolved blood perfusion and oxygen saturation in human skin response to thermal stimulation
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作者 Shu-You Wang Yan-Ke Ai +6 位作者 Yu-Ying Tian Qi-Zhen Wang Shu-Yong Jia Feng Xiong Xiao-Jing Song Wei-Bo Zhang Guang-Jun Wang 《TMR Modern Herbal Medicine》 CAS 2022年第1期10-19,共10页
The functional status of vessels can be determined by assessing blood perfusion.By integrating diffuse reflectance spectroscopy(DRS)and Laser Doppler Flowmetry(LDF),the speed-resolved blood perfusion and blood oxygen ... The functional status of vessels can be determined by assessing blood perfusion.By integrating diffuse reflectance spectroscopy(DRS)and Laser Doppler Flowmetry(LDF),the speed-resolved blood perfusion and blood oxygen saturation can be measured simultaneously by Enhanced Perfusion and Oxygen Saturation(EPOS).The dataset presented in this descriptor contains EPOS data recorded from a forearm point exposed to different levels of thermal stimulation,the classical LDF at control points,the R-R time series and data regarding the subjects’characteristics.All data were recorded from 60 recruited healthy subjects.Half of the subjects received different levels of thermal stimulation,and half of them were blank controls.We believe that this dataset will lead to the development of local blood perfusion methods that can be used to index vessel function assessments.This publicly available dataset will be beneficial to the microcirculation evaluation. 展开更多
关键词 Laser Doppler Flowmetry Speed-resolved Blood Perfusion Blood Oxygen Saturation Thermal Stimulation ELECTROCARDIOGRAM Coherence Analysis
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Stimulated Brillouin scattering evolution and suppression in an integrated stimulated thermal Rayleigh scattering-based fiber laser 被引量:2
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作者 JIWEN CUI HONG DANG +7 位作者 KUNPENG FENG WENLEI YANG TAO GENG YANG HU YUANHANG ZHANG DONG JIANG XUDONG CHEN JIUBIN TAN 《Photonics Research》 SCIE EI 2017年第3期233-238,共6页
The spectral purity of fiber lasers has become a critical issue in both optical sensing and communication fields.As a result of ultra-narrow intrinsic linewidth, stimulated thermal Rayleigh scattering(STRS) has presen... The spectral purity of fiber lasers has become a critical issue in both optical sensing and communication fields.As a result of ultra-narrow intrinsic linewidth, stimulated thermal Rayleigh scattering(STRS) has presented special potential to compress the linewidth of fiber lasers. To suppress stimulated Brillouin scattering(SBS), the most dominant disturbance for STRS in optical fibers, a semi-quantitative estimation has been established to illuminate the mechanism of suppressing SBS in a periodic tapered fiber, and it agrees with experimental results. Finally, a linewidth compression device based on STRS is integrated into a single-longitudinal-mode ring-cavity fiber laser with secondary cavities, and its linewidth is verified to be 200 Hz through a self-heterodyne detecting and Voigt fitting method. 展开更多
关键词 SBS is on of in stimulated Brillouin scattering evolution and suppression in an integrated stimulated thermal Rayleigh scattering-based fiber laser
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To understand moxibustion from the biological effect of local thermal stimulation 被引量:4
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作者 黄凯裕 梁爽 +2 位作者 陆露 Patrick John Morgan 张建斌 《World Journal of Acupuncture-Moxibustion》 CSCD 2016年第3期31-37,48,共8页
Moxibustion is one of treatment modalities in Traditional Chinese Medicine(TCM). Its working mechanism is activated through heat-induced local thermal stimulation. By reviewing and compiling clear, scientific analys... Moxibustion is one of treatment modalities in Traditional Chinese Medicine(TCM). Its working mechanism is activated through heat-induced local thermal stimulation. By reviewing and compiling clear, scientific analysis of the biological and physiological effects from local thermal heat, the authors provides a coherent and systemic source to aid us to form an understanding of the mechanism of moxibustion’s promotion of qi and blood circulation throughout the body from local thermal stimulation. This has been done by a rigorous review of previous studies of the thermal effect on the body. The following presents the local, distal and systemic biological effects from local thermal stimulation while also discussing the similarities and differences between local thermal stimulation and moxibustion. 展开更多
关键词 MOXIBUSTION RULE local thermal stimulation the biological effect
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The effect of depression on the thermal nociceptive thresholds in rats with spontaneous pain 被引量:1
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作者 苏园林 王宁 +2 位作者 高歌 王锦琰 罗非 《Neuroscience Bulletin》 SCIE CAS CSCD 2010年第6期429-436,共8页
Objective Recently,there has been growing interest in the interaction between depressive disorders and pain.The purpose of this study was to examine whether depression would lead to a decreased sensitivity to noxious ... Objective Recently,there has been growing interest in the interaction between depressive disorders and pain.The purpose of this study was to examine whether depression would lead to a decreased sensitivity to noxious stimuli in rats with spontaneous pain.Methods The olfactory bulbectomized rats were used as a model of depression.The depression-like behaviors were assessed by open field test and changes in body weight.Formalin solution was injected into the rat hindpaw to produce ongoing pain.Noxious thermal stimuli were applied onto the hindpaw contralateral to formalin injection,and the withdrawal thresholds were measured.Results In non-depressive rats,the formalin-treated paw developed hypoalgesia to noxious stimuli while the contralateral paw was not affected.The depressive rats,however,showed a significantly lower sensitivity to noxious thermal stimulus,represented as higher withdrawal thresholds of the contralateral paw,when compared to the non-depressive rats.Conclusion These results demonstrate that depression can alleviate the stimulus-evoked pain even in the context of formalin inflammatory pain,consistent with the previous clinical observations that patients suffering from both depression and persistent pain have decreased sensitivities to noxious experimental stimuli. 展开更多
关键词 DEPRESSION evoked pain FORMALIN olfactory bulbectomy thermal stimulation
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The effects of deep-level defects on the electrical properties of Cd0.9Zn0.1Te crystals 被引量:1
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作者 Pengfei Wang Ruihua Nan Zengyun Jian 《Journal of Semiconductors》 EI CAS CSCD 2017年第6期8-13,共6页
The deep-level defects of Cd Zn Te(CZT)crystals grown by the modified vertical Bridgman(MVB)method act as trapping centers or recombination centers in the band gap,which have significant effects on its electrical ... The deep-level defects of Cd Zn Te(CZT)crystals grown by the modified vertical Bridgman(MVB)method act as trapping centers or recombination centers in the band gap,which have significant effects on its electrical properties.The resistivity and electron mobility–lifetime product of high resistivity Cd(0.9)Zn(0.1)Te wafer marked CZT1 and low resistivity Cd(0.9)Zn(0.1)Te wafer marked CZT2 were tested respectively.Their deep-level defects were identified by thermally stimulated current(TSC)spectroscopy and thermoelectric effect spectroscopy(TEES)respectively.Then the trap-related parameters were characterized by the simultaneous multiple peak analysis(SIMPA)method.The deep donor level(EDD/dominating dark current was calculated by the relationship between dark current and temperature.The Fermi-level was characterized by current–voltage measurements of temperature dependence.The width of the band gap was characterized by ultraviolet-visible-infrared transmittance spectroscopy.The results show the traps concentration and capture cross section of CZT1 are lower than CZT2,so its electron mobility–lifetime product is greater than CZT2.The Fermi-level of CZT1 is closer to the middle gap than CZT2.The degree of Fermi-level pinned by EDDof CZT1 is larger than CZT2.It can be concluded that the resistivity of CZT crystals increases as the degree of Fermi-level pinned near the middle gap by the deep donor level enlarges. 展开更多
关键词 Cdo.9Zn0.1Te deep-level defects thermally stimulated current spectroscopy FERMI-LEVEL electrical properties
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AC ageing characteristics of Co-doped ZnO varistors 被引量:1
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作者 TU YouPing WANG Qian +2 位作者 HE Jie LI Xiao DING LiJian 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第6期1354-1360,共7页
As the key protection device in the power system, the ageing characteristics of ZnO varistor can directly affect the safe operation of power system. In order to study the influence of Co2O3 content on the electrical p... As the key protection device in the power system, the ageing characteristics of ZnO varistor can directly affect the safe operation of power system. In order to study the influence of Co2O3 content on the electrical properties of ZnO varistors, thermally stimulated current (TSC) characteristics test, capacitance-voltage (C-V) characteristics test, scanning electron microscope (SEM) test, voltage-current (V-I) test were carried out on ZnO varistors before and after AC ageing tests. The results show that the mean grain size decreases while the varistor voltage increases as the Co2O3 content increases, the barrier height and the defects of ZnO varistors increase with the increase of Co2O3 content, and the barrier height decreases at a certain degree after AC ageing test. As the Co2+ ion radius is close to that of Zn2+ ion, it is easy for Co2+ ions to enter into ZnO lattice during sintering process, which is account for the increase of zinc interstitial of ZnO varistors. When the Co2O3 content exceeds a certain range, the AC degradation degree of ZnO varistors will become much more serious. From the experimental results, ZnO varistors doped with 1.0 mol% Co2 O3 exhibit a better performance. 展开更多
关键词 ZnO varistors Co2O3 AC ageing thermally stimulated current (TSC) Schottky barrier
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Optical and thermoluminescence properties of Lu_2Si_2O_7:Pr single crystal
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作者 冯鹤 任国浩 +5 位作者 吴云涛 徐军 杨秋红 谢建军 周明奇 陈晨龙 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第8期775-779,共5页
Single crystal of Lu2Si2OT:Pr was grown by Czochralski method. Transmittance, photoluminescence excitation (PLE) and photo- luminescence (PL) spectra, X-ray excited luminescence (XEL) and fluorescence decay tim... Single crystal of Lu2Si2OT:Pr was grown by Czochralski method. Transmittance, photoluminescence excitation (PLE) and photo- luminescence (PL) spectra, X-ray excited luminescence (XEL) and fluorescence decay time spectra of the sample were measured and dis- cussed to investigate its optical characteristics. The crystal structure of the as grown Lu2Si207:Pr was confirmed to be C2/m. There was a broad absorption peaking at 245 um in the region from 200-260 urn. The PL spectntm was dominated by fast 3py^3Hj band peaking at 524 nm. The XEL spectrum was dominated by the fast 5d14t^---~41e emission peaking at 265 nm. The 2D (temperature-intensity) and 3D (tem- perature-wavelength-intensity) thermally stimulated luminescence (TSL) spectra were measured. The Pr3+ ion was found to be the recombina- tion center during the TSL process. Three obvious traps were detected in LPS:Pr single crystal with energy depth at 1.06, 0.78 and 0.67 eV. 展开更多
关键词 Pr3+ doped lutetium pyrosilicate single crystal scintillation optical properties thermally stimulated luminescence rare earths
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Analysis of factors influencing moxibustion efficacy by affecting heat-activated transient receptor potential vanilloid channels 被引量:8
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作者 Jiang Jinfeng Wang Xinjun +1 位作者 Wu Xiaojing Yu Zhi 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2016年第2期255-260,共6页
Moxibustion is an important component part of Traditional Chinese Medicine(TCM).Among different kinds of moxibustion methods,thermal stimulation seems to be a pivotal impact factor to the theraputic efficacy.Based on ... Moxibustion is an important component part of Traditional Chinese Medicine(TCM).Among different kinds of moxibustion methods,thermal stimulation seems to be a pivotal impact factor to the theraputic efficacy.Based on its thermal characteristic and treated area-skin,we hypothesize that the thermosensitive TRPV channels may involve in the mechanism of moxibustion.This study,by referring to various experimental and clinical data,analyzes the properties and features of transient receptor potential vanilloid(TRPV)subfamily 1-4 and the impact of moxibustion on these channels.The factors impacting the efficacy of moxibustion treatment were analyzed on three levels:the independent ba-sic factors of moxibustion(temperature,space and time);moxibustion intensity(a compound factor achieved through comprehensive control of the three individual basic factors mentioned above);and moxibustion quantity(the amount of temperature stimulation applied within a certain unit of time,including the total amount of moxibustion treatment).The results from present study show that the effect of moxibustion therapy appears to be determined by the activation of TRPV1-4,mainly TRPV1 and TRPV2.Temperature(the degree of heat stimulation),time and area(how long the treatment lasts and how many TRPV1-4 channels are activated)affect the intensity of moxibustion treatment to form effective moxibustion quantity;this should be considered in clinical moxibustion application. 展开更多
关键词 MOXIBUSTION Thermal stimulation Ther moreceptor Transient receptor potential channels
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Effect of thermal stimulation on gas production from hydrate deposits in Shenhu area of the South China Sea 被引量:4
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作者 SU Zheng HUANG Li +1 位作者 WU NengYou YANG ShengXiong 《Science China Earth Sciences》 SCIE EI CAS 2013年第4期601-610,共10页
The Shenhu area on the northern continental slope of the South China Sea (SCS) is one of the promising fields for gas hydrate exploitation. The hydrate-bearing layer at drilling site SH2 is overlain and underlain by... The Shenhu area on the northern continental slope of the South China Sea (SCS) is one of the promising fields for gas hydrate exploitation. The hydrate-bearing layer at drilling site SH2 is overlain and underlain by permeable zones of mobile water. In this study a vertical well was configured with a perforated Interval I for producing gas and a coiled Interval II for heating sed- iment, The hydrate is dissociated by a small depressurization at Interval Ⅰ and a thermal stimulation at Interval Ⅱ. The numeri- cal simulations indicate that the thermal stimulation has a significant effect on gas release from the hydrates in the production duration and improves the gas production in the late period. The gas released by thermal stimulation cannot be produced as quickly as the production gets operated because of the hard pathway for fluids to flow in the sediments. The gas production is enhanced due to the heating for 7242 m3 in the whole production. Increasing heating temperature at Interval Ⅱcan improve gas production and restrain water output, and advance the arrival time of the gas flow from the zone at Interval Ⅱ. The absolute criterion and relative criterion suggest that the thermal stimulation in the production schemes is pronounced for releasing gas from the hydrate deposit, but the production efficiency of gas is limited by the sediment of low permeability. The study pro- vides an insight into the production potential of the hydrate accumulations by thermal stimulation with depressurization in two wells, and a basis for analyzing economic feasibility of gas production from the area. 展开更多
关键词 gas hydrates Shenhu area hydrate dissociation thermal stimulation numerical simulation
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Medulla Oblongata Mechanism of Inhibitory Effect of Thermal Stimulation to Nociceptive Colorectal Distention in Rats 被引量:1
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作者 Liang Li Pei-Jing Rong +3 位作者 Xin-Yan Gao Hui Ben Hong Cai Bing Zhu 《World Journal of Traditional Chinese Medicine》 2016年第2期65-71,共7页
Objective: To discuss mechanism of moxibustion(thermal stimulation) effect and best moxibustion stimulus parameter.Methods: Experiments were performed on 48 male Sprague-Dawley rats. Unit discharges from individual si... Objective: To discuss mechanism of moxibustion(thermal stimulation) effect and best moxibustion stimulus parameter.Methods: Experiments were performed on 48 male Sprague-Dawley rats. Unit discharges from individual single neuron were recorded extracellularly with glass-microelectrode in Subnucleus Reticularis Dorsalis(SRD). Visceral-intrusive stimulation is done by colorectal distension. Thermal stimulation with different temperature(40°C, 42°C, 44°C, 46°C, 48°C, 50°C, 52°C) and different stimulus area(diameter of circle : 1.0 cm, 1.5 cm, 2.0 cm, 2.5 cm, 3.0 cm, 3.5 cm, 4.0 cm) was applied around RN12 during nociceptive colorectal distension.Results: SRD neurons could be activated by visceral stimulation within noxious range. Under low temperature of stimulus, especially under45°C of pain threshold to ordinary people, visceral nociceptive afferent facilitated thermal stimulus from the body surface. While after thermal stimulation reached a harmful degree, the thermal stimulus will inhibit visceral nociceptive afferent. Moreover, statistics show that the higher the temperature is, the smaller the size of stimulation area is needed, and they correlate with each other negatively.Conclusion: Visceral nociception could be inhibited by somatic thermal stimulation with specific parameter at medulla level. According to our finding, best thermal stimulation temperature is around 48°C and the best size of stimulation area is around 3.14-7.07 cm2(with 2.0-3.0 cm diameter). 展开更多
关键词 Thermal stimulation Subnucleus Reticularis Dorsalis Stimulus Parameter
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