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Determination of Arsenic and Mercury in Soil by Microwave Digestion and Hidride GenerationAtomic Fluorescence Spectrometry 被引量:5
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作者 王天顺 杨玉霞 +5 位作者 牙禹 莫磊兴 范业赓 廖洁 黄东亮 谭宏伟 《Agricultural Science & Technology》 CAS 2013年第4期651-653,共3页
[Objective] The aim was to develop a rapid, simple method for determina- tion of arsenic and mercury in soil samples by atomic fluorescence spectrometry. [Method] The method for determination of As and Hg in soil by c... [Objective] The aim was to develop a rapid, simple method for determina- tion of arsenic and mercury in soil samples by atomic fluorescence spectrometry. [Method] The method for determination of As and Hg in soil by combined atomic fluorescence spectrometry and microwave digestion was used. [Result] The concentration curve was linear within the range of 0-80.0μg/L of As and 0-8.0 μg/L of Hg, and the detection limits of As and Hg was 0.036 μg/L and 0.015 μg/L, respectively. The precision for elevenfold determination of As at 40.0 ug/L level and Hg at 4.0μg/L level were 1.1% and 2.2%(RSD), respectively. Recoveries of 103.0%-106.6% for As and 90.0%-95.0% for Hg were obtained for there soil samples. [Conclusion] The proposed method has the advantages of simple operation, high sensitivity, and high efficiency; it was successfully used for determination of As and Hg in soil samples. 展开更多
关键词 Microwave digestion atomic fluorescence spectrometry ARSENIC MERCURY SOIL
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Characterization of a velocity-tunable ^(87)Rb cold atomic source with a high-speed imaging technology 被引量:3
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作者 冯焱颖 朱常兴 +3 位作者 王晓佳 薛洪波 叶雄英 周兆英 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第8期3373-3378,共6页
This paper has developed and characterized a method to produce a velocity-tunable ^87Rb cold atomic source for atomic interferometry application. Using a high speed fluorescence imaging technology, it reports that the... This paper has developed and characterized a method to produce a velocity-tunable ^87Rb cold atomic source for atomic interferometry application. Using a high speed fluorescence imaging technology, it reports that the dynamic process of the atomic source formation is observed and the source performances including the flux and the initial velocity are characterized. A tunable atomic source with the initial velocity of 1.4-2.6 m/s and the atomic source flux of 2× 10^8 - 6 × 10^9 atoms/s has been obtained with the built experimental setup. 展开更多
关键词 cold atomic source velocity-tunable hizh sueed fluorescence imaging
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Analysis of trace mercury in water by solid phase extraction using dithizone modified nanometer titanium dioxide and cold vapor atomic absorption spectrometry 被引量:5
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作者 MA Xiaoguo HUANG Bei CHENG Meiqing 《Rare Metals》 SCIE EI CAS CSCD 2007年第6期541-546,共6页
A new method for analysis of trace mercury in water samples was developed, based on the combination of preconcentration/separation using dithizone-modified nanometer titanium dioxide (TiO2) as a solid phase extracta... A new method for analysis of trace mercury in water samples was developed, based on the combination of preconcentration/separation using dithizone-modified nanometer titanium dioxide (TiO2) as a solid phase extractant and determination by cold vapor atomic adsorption spectrometry (CVAAS). Dithizone was dissolved with alcohol and loaded on the surface of nano-sized TiO2 powders by stirring. The static adsorption behavior of Hg^2+on the dithizone-modified nanoparficles was investigated in detail. It was found that excellent adsorption ratio for Hg^2+ could be obtained in the pH range of 7-8 with an oscillation time of 15 rain, and a 5 mL of 3.5 mol·L^-1 HCI solution could quantitatively elute Hg^2+ from nanometer TiO2 powder. Common coexisting ions caused no obvious influence on the determination of mercury. The mechanisms for the adsorption and desorption were discussed. The detection limit (30) for Hg^2+ was calculated to be 5 ng·L^-1. The proposed method was applied to the determination of Hg^2+ in a mineral water sample and a Zhujiang River water sample. By the standard addition method, the average recoveries were found to be 94.4%-108.3% with RSD (n = 5) of 2.9%-3.5%. 展开更多
关键词 analytical chemistry MERCURY solid-phase extraction TiO2 nanoparticle cold vapor atomic adsorption spectrometry (CVAAS)
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Speciation Analysis of Arsenic Compounds in Seafood by Ion Chromatography-Atomic Fluorescence Spectrometry 被引量:2
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作者 HAN Tingting JI Hongwei +6 位作者 LI Huixin CUI He Song Tian DUAN Xiaojuan ZHU Qianlin CAI Feng ZHANG Li 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第3期455-460,共6页
Ion chromatography-ultra violet-hydride generation-Atomic Florescence Spectrometry was applied to detect 5 arsenic species in seafoods. The arsenic species studied include arsenobetaine(As B), arsenite(As(III)), dimet... Ion chromatography-ultra violet-hydride generation-Atomic Florescence Spectrometry was applied to detect 5 arsenic species in seafoods. The arsenic species studied include arsenobetaine(As B), arsenite(As(III)), dimethylarsinic acid(DMA), monomethylarsonic acid(MMA), and arsenate(As(V)), which were extracted from samples using 2% formic acid. Gradient elution using 33 mmol L^(-1) CH_3COONH_4 and 15 mmol L^(-1) Na_2CO_3 with 10 mL CH_3CH_2OH at pH 8.4 allowed the chromatographic separation of all the species on a Hamilton PRP-X100 anion-exchange column in less than 8 min. In this study, an ultrasound extraction method was used to extract arsenic species from seafood. The extraction efficiency was good and the recoveries from spiked samples were in the range of 72.6%–109%; the precision between sample replicates was higher than 3.6% for all determinations. The detection limits were 3.543 μg L^(-1) for As B, 0.4261 μg L^(-1) for As(III), 0.216 μg L^(-1) for DMA, 0.211 μg L^(-1) for MMA, and 0.709 μg L^(-1) for As(V), and the linear coefficients were greater than 0.999. We also developed an application of this method for the determination of arsenic species in bonito, Euphausia superba, and Enteromorpha with satisfactory results. Therefore, it was confirmed that this method was appropriate for the detection of arsenic species in seafood. 展开更多
关键词 arsenic species SEAFOOD ion chromatography atomic fluorescence spectrometry
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Highly sensitive detection of Rydberg atoms with fluorescence loss spectrum in cold atoms 被引量:1
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作者 Xuerong Shi Hao Zhang +3 位作者 Mingyong Jing Linjie Zhang Liantuan Xiao Suotang Jia 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第1期218-222,共5页
Fluorescence loss spectrum for detecting cold Rydberg atoms with high sensitivity has been obtained based on lock-in detection of fluorescence of 6 P3/2 state when cooling lasers of the magneto-optical trap are modula... Fluorescence loss spectrum for detecting cold Rydberg atoms with high sensitivity has been obtained based on lock-in detection of fluorescence of 6 P3/2 state when cooling lasers of the magneto-optical trap are modulated.The experiment results show that the signal to noise ratio has been improved by 32.64 dB when the modulation depth(converted to laser frequency)and frequency are optimized to 4 MHz and 6 kHz,respectively.This technique enables us to perform a highly sensitive non-destructive detection of Rydberg atoms. 展开更多
关键词 fluorescence loss spectrum Rydberg atoms signal to noise ratio
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Determination of arsenic in grain and soil by hydride nondispersive atomic fluorescence method
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作者 Ji Weinong and Fan MaomianNanjing Agricultural University,Nanjing,China 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1990年第1期109-115,共7页
Quantity of trace arsenic in grain and soil was determined by hydride nondispersive atomic fluorescence method.Optimum conditions of measurement were selected in the experiment including the pH of the medium, reductiv... Quantity of trace arsenic in grain and soil was determined by hydride nondispersive atomic fluorescence method.Optimum conditions of measurement were selected in the experiment including the pH of the medium, reductive agent, the concentration and flowing velocity of KBH4, rate of carrier gas and atomized temperature. The reference sample of rice C was determined and the linear relationship of the calibration curve was plotted, indicating that the method was highly precise. In the experiment of recovery rate, the method was quite satisfactory.Based on the determination of hundreds of samples, it is proved that atomic fluorescence method is rapid, sensitive and low in interference. It is very efficient on determination of trace arsenic in soils and grains, especially in grains. 展开更多
关键词 SOIL GRAIN trace arsenic atomic fluorescence.
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Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock
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作者 Xi Zhang Fei Yang +4 位作者 Zi-Tong Feng Jie-Jun Zhao Fang Wei Hai-Wen Cai Rong-Hui Qu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期273-278,共6页
We propose a method to directly measure phase-related noise characteristics of single-frequency lasers in the 728–980 nm band based on a 120°phase difference interferometer.Differential phase information of the ... We propose a method to directly measure phase-related noise characteristics of single-frequency lasers in the 728–980 nm band based on a 120°phase difference interferometer.Differential phase information of the laser under test is demodulated via the interferometer.Other parameters related to the phase noise characteristics such as linewidth at different observation time, phase/frequency noise, power spectrum density of phase/frequency fluctuation, and Allan deviation are further obtained.Frequency noise as low as 1 Hz^2/Hz can be measured using our system.Then the phase-related noise characteristics of two commercial lasers frequently used in cold atomic clocks are studied systematically by the method.Furthermore, several influencing factors and their relative evolution laws are also revealed, such as the pump current and frequency-locking control parameters.This would help to optimize the laser performance, select laser sources, and evaluate the system performance for cold atomic physics applications. 展开更多
关键词 cold atomic PHYSICS quantum MECHANICS 780 NM lasers phase/frequency noise
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Evaluation of Atomic Fluorescence Spectrometry for Determination of Mercury Using a Low-Powered Argon Microwave Plasma Torch (MPT)
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作者 Duan Yixiang, Kong Xiangxing, Zhang Hanqi, Liu Jun Jin Qinhan (Department of Chemistry, Jilin University, Changchun) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1991年第1期59-61,共3页
The Microwave-Induced Plasma (MIP) has received considerable attention during the past decade since theintroduction of the Becnakker Cavity. It has been commonly used as an atomization cell for atomic emission spectro... The Microwave-Induced Plasma (MIP) has received considerable attention during the past decade since theintroduction of the Becnakker Cavity. It has been commonly used as an atomization cell for atomic emission spectrometry (AES) and atomic absorption spectrometry (AAS), and a great success was achieved for both techniques. More 展开更多
关键词 atomic fluorescence spectrometry Argon microwave torch Determination of mercury
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Influencing Factors of Determination of Total Arsenic in Soil by Atomic Fluorescence(AFS-9760) Method
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作者 Tingting MENG 《Asian Agricultural Research》 2020年第1期50-52,共3页
In this paper,the atomic fluorescence(AFS-9760)method used for the determination of total arsenic in soil was verified based on three national quality control samples GSS-8,GSS-25,and GSF-3.Under the conditions of neg... In this paper,the atomic fluorescence(AFS-9760)method used for the determination of total arsenic in soil was verified based on three national quality control samples GSS-8,GSS-25,and GSF-3.Under the conditions of negative pressure of 270 V,carrier gas flow of 300 m L/min,and shield flow of 1000 m L/min,the detection limit of the method was 0.0092 mg/kg;the precision of GSS-8,GSS-25,and GSF-3 was 3.96%,1.47%and 1.08%,and the accuracy was 3.07%,2.13%,2.93%respectively.In addition,the matters needing attention during this experiment,such as reagent factor,instrument conditions,calibration curve,etc.,were summarized.It provides certain reference for the determination of total arsenic content in soil by atomic fluorescence spectrometry. 展开更多
关键词 atomic fluorescence SOIL TOTAL ARSENIC Influencing factors
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Study on Atomic Fluorescence Spectrometry Excited by Synchrotron Radiation
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作者 Jia-jia Guo Wu-er Gana +1 位作者 Guo-bin Zhang Qing-de Sua 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2008年第5期427-432,共6页
A novel analysis approach using atomic fluorescence excited by synchrotron radiation is presented. A system for synchrotron radiation-atomic fluorescence spectrometry is developed, and experimental conditions such as ... A novel analysis approach using atomic fluorescence excited by synchrotron radiation is presented. A system for synchrotron radiation-atomic fluorescence spectrometry is developed, and experimental conditions such as flow rate, analyte acidity, concentration of pre-reducing and hydrogenation system are optimized. The proposed method is successfully applied to get an excitation spectrum of arsenic. Seven of ten primary spectral lines, four of which have never been reported by means of atomic fluorescence spectrometry, agree well with the existing reports. The other three are proposed for the first time. Excitation potentials and possible transitions are investigated. Especially for the prominent line at 234.99 nm, the mechanism of generation is discussed and a model of energy transition processes is proposed. 展开更多
关键词 Synchrotron radiation atomic fluorescence ARSENIC Energy transition
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Electromagnetically Induced Transparency in a Cold Gas with Strong Atomic Interactions
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作者 焦月春 韩小萱 +2 位作者 杨智伟 赵建明 贾锁堂 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第12期32-35,共4页
Electromagnetically induced transparency (EIT) is investigated in a system of cold, interacting cesium Rydberg atoms. The utilized cesium levels 6S1/2, 6P3/2 and nD5/2 constitute a cascade three-level system, in whi... Electromagnetically induced transparency (EIT) is investigated in a system of cold, interacting cesium Rydberg atoms. The utilized cesium levels 6S1/2, 6P3/2 and nD5/2 constitute a cascade three-level system, in which a coupling laser drives the Rydberg transition, and a probe laser detects the EIT signal on the 6S1/2 to 6/23/2 transition. Rydberg EIT spectra are found to depend on the strong interaction between the Rydberg atoms. Diminished EIT transparency is obtained when the Rabi frequency of the probe laser is increased, whereas the corresponding linewidth remains unchanged. To model the system with a three-level Linclblad equation, we introduce a Rydberg-level dephasing rate γ3 = κ×(P33/Ωp)^2, with a value κ that depends on the ground-state atom density and the Rydberg level, The simulation results are largely consistent with the measurements. The experiments, in which the principal quantum number is varied between 30 and 43, demonstrate that the EIT reduction observed at large Ωp is due to the strong interactions between the Rydberg atoms. 展开更多
关键词 EIT IS of Electromagnetically Induced Transparency in a cold Gas with Strong atomic Interactions in with
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EVALUATON OF MICROWAVE PLASMA TORCH FOR ATOMIC FLUORESCENCE SPECTROMETRY WITH AN ULTRASONIC NEBULIZATION SAMPLE INTRODUCTION SYSTEM
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作者 Yi Mu LI Yi Xiang DUAN +1 位作者 Jun LIU Qin Han JIN Department of Chemistry, Jilin University, Changchun, 130O23 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第7期615-618,共4页
In this paper, a new MPT(microwave plasma torch) device has been used as a atomizer for atomic fluorescence spectrometry. Spme elements, such as Zn, Cd, Hg, Pb, As, Co, Mg, Cu, Ag, Mn, Fe have been investigated in det... In this paper, a new MPT(microwave plasma torch) device has been used as a atomizer for atomic fluorescence spectrometry. Spme elements, such as Zn, Cd, Hg, Pb, As, Co, Mg, Cu, Ag, Mn, Fe have been investigated in detail. 展开更多
关键词 TORCH EVALUATON OF MICROWAVE PLASMA TORCH FOR atomic fluorescence SPECTROMETRY WITH AN ULTRASONIC NEBULIZATION SAMPLE INTRODUCTION SYSTEM Cd USN LONG HCL MPT
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Determination of Cadmium in TSP, PM10 in urban areas by hydride generation atomic fluorescence spectrometry
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作者 LIANG Shu-xuan LI Ling ZHOU Wei-jing LV Tian-feng SUN Han-wen 《Journal of Environmental Science and Engineering》 2007年第1期39-43,54,共6页
In this paper, two different diameter particles (TSP, PM10) were collected by TH-16A four-channels classification air sampler. The samples were treated by HNO3. Analysis of cadmium was carried out by hydride generat... In this paper, two different diameter particles (TSP, PM10) were collected by TH-16A four-channels classification air sampler. The samples were treated by HNO3. Analysis of cadmium was carried out by hydride generation atomic fluorescence spectrometry (HG-AFS) method, and distribution proportions of elements in four phases were calculated. This method was based on the reaction of cadmium with 1.5% (m/v) KBH4 solution and 0.5% KOH(m/v) solution to form the hydride gas in medium of 2% (v/v) HCl. The detection limit for cadmium as low as 0.008μg/L was obtained. The lineally correlation coefficient was 0.99992. The relative standard deviation (n=5, C=1.00μg/L) was 3.26%. The proposed method was applied for the determination of cadmium in atmosphere aerosol samples and the recoveries in the range of 95-102.2% were obtained. This method was simple, rapid, less matrix interference and high sensitivity. 展开更多
关键词 hydride generation atomic fluorescence spectrometry atmosphere aerosol CADMIUM
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Determination of Hg in soil by ultrasonic slurry sampling hydride generation atomic fluorescence spectrometry
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作者 LIANG Shu-xuan LV Tian-feng ZHOU Wei-jing SUN Han-wen 《Journal of Environmental Science and Engineering》 2008年第5期9-13,共5页
Ultrasonic aided slurry sampling hydride generation atomic fluorescence spectrometry (USS-HG-AFS) was developed for the determination of Hg in soil samples from a sewage-irrigated farm. 500 mg grounded soil was susp... Ultrasonic aided slurry sampling hydride generation atomic fluorescence spectrometry (USS-HG-AFS) was developed for the determination of Hg in soil samples from a sewage-irrigated farm. 500 mg grounded soil was suspended in agar solution by an ultrasound water bath before the HG-AFS determination. The results for the reference material of soil (serial number GBW-07411) agreed satisfactorily with the certified values. Results obtained by the developed procedure compared well with those after traditional acid digestion of samples. The detection limit are 6.7ngL-1 for Hg respectively, with average relative standard deviation values of 6.4% for analysis of a series of soil samples of different origin. The recoveries of the anatytes varied in the range from 95 to 107%. This observation has stimulated interest in fast, accurate and sensitive analytical methods for determination of metals in soil. 展开更多
关键词 hydride generation ultrasonic slurry sampling atomic fluorescence spectrometry SOIL trace element
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Miniature laser frequency stabilization module for cold atom sensing
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作者 Qingzhe Gou Ning Wei +4 位作者 Haixu Tao Kang Cheng Yongtao Fan Jiajing He Jun Wang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第10期65-69,共5页
In this study,a miniature laser frequency stabilization module for cold atom sensing applications was designed and realized.The module can lock the laser frequency to the saturated absorption spectrum of the D2 line o... In this study,a miniature laser frequency stabilization module for cold atom sensing applications was designed and realized.The module can lock the laser frequency to the saturated absorption spectrum of the D2 line of rubidium(Rb)atoms using the frequency modulation spectroscopy method.The module core is a tiny Rb cell,co-packaged with the saturation absorption optical setup,temperature control circuit,and detection circuit through a joint optical-mechanical-electrical design for a total volume of only 40 mm×15 mm×30 mm.The frequency fluctuation of the 780 nm laser after frequency stabilization by the module was within 1 MHz over 1000 s,which is adequate for magneto-optical trap experiments.The results verify the feasibility of the module as a frequency reference and provide a light source for portable cold atom sensing devices. 展开更多
关键词 frequency stabilization MINIATURIZATION cold atoms saturation absorption spectrum
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Atomic transport dynamics in crossed optical dipole trap
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作者 彭鹏 张正熙 +5 位作者 樊耀塬 殷国玲 毛德凯 陈徐宗 熊炜 周小计 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第7期293-301,共9页
We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loadin... We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loading and atomic loss.The loading process normally is negligible in the evaporative cooling experiment on the ground, while it is significant in preparation of ultra-cold atoms in the space station. Normally, the atomic loading process is much weaker than the atomic loss process, and the atomic number in the central region of the trap decreases monotonically, as reported in previous research. However, when the atomic loading process is comparable to the atomic loss process, the atomic number in the central region of the trap will initially increase to a maximum value and then slowly decrease, and we have observed the phenomenon first. The increase of atomic number in the central region of the trap shows the presence of the loading process, and this will be significant especially under microgravity conditions. We build a theoretical model to analyze the competitive relationship, which coincides with the experimental results well. Furthermore, we have also given the predicted evolutionary behaviors under different conditions. This research provides a solid foundation for further understanding of the atomic transport process in traps. The analysis of loading process is of significant importance for preparation of ultra-cold atoms in a crossed optical dipole trap under microgravity conditions. 展开更多
关键词 cold atom crossed optical dipole trap transport process
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Development of the integrated integrating sphere cold atom clock 被引量:4
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作者 Ming-Yuan Yu Yan-Ling Meng +6 位作者 Mei-Feng Ye Xin Wang Xin-Chuan Ouyang Jin-Yin Wan Ling Xiao Hua-Dong Cheng Liang Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期184-187,共4页
We develop an integrated integrating sphere cold atom clock(ISCAC), which mainly consists of physical package,laser system, microwave source, and electronics.This compact system is more stable and reliable than the pr... We develop an integrated integrating sphere cold atom clock(ISCAC), which mainly consists of physical package,laser system, microwave source, and electronics.This compact system is more stable and reliable than the previous version.The experimental results show that the short term frequency stability of 5.4×10^-13τ-1/2 and 2.9× 10^-15 at 1-day integrating time are achieved. 展开更多
关键词 integrating SPHERE cold ATOM CLOCK PHYSICAL PACKAGE laser system frequency stability
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Quantitative energy-dispersive X-ray fluorescence analysis for unknown samples using full-spectrum least-squares regression 被引量:6
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作者 Yong-Li Liu Qing-Xian Zhang +2 位作者 Jian Zhang Hai-Tao Bai Liang-Quan Ge 《Nuclear Science and Techniques》 SCIE CAS CSCD 2019年第3期149-159,共11页
The full-spectrum least-squares(FSLS) method is introduced to perform quantitative energy-dispersive X-ray fluorescence analysis for unknown solid samples.Based on the conventional least-squares principle, this spectr... The full-spectrum least-squares(FSLS) method is introduced to perform quantitative energy-dispersive X-ray fluorescence analysis for unknown solid samples.Based on the conventional least-squares principle, this spectrum evaluation method is able to obtain the background-corrected and interference-free net peaks, which is significant for quantization analyses. A variety of analytical parameters and functions to describe the features of the fluorescence spectra of pure elements are used and established, such as the mass absorption coefficient, the Gi factor, and fundamental fluorescence formulas. The FSLS iterative program was compiled in the C language. The content of each component should reach the convergence criterion at the end of the calculations. After a basic theory analysis and experimental preparation, 13 national standard soil samples were detected using a spectrometer to test the feasibility of using the algorithm. The results show that the calculated contents of Ti, Fe, Ni, Cu, and Zn have the same changing tendency as the corresponding standard content in the 13 reference samples. Accuracies of 0.35% and 14.03% are obtained, respectively, for Fe and Ti, whose standard concentrations are 8.82% and 0.578%, respectively. However, the calculated results of trace elements (only tens of lg/g) deviate from the standard values. This may be because of measurement accuracy and mutual effects between the elements. 展开更多
关键词 Energy-dispersive X-ray fluorescence analysis Full-spectrum LEAST-SQUARES METHOD Effective atomic number Mass attenuation coefficient Fundamental parameter METHOD
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Continuous Dynamic Rotation Measurements Using a Compact Cold Atom Gyroscope 被引量:12
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作者 姚战伟 鲁思滨 +4 位作者 李润兵 王锴 曹雷 王谨 詹明生 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第8期41-44,共4页
We present an experimental demonstration of the rotation measurement using a compact cold atom gyroscope. Atom interference fringes are observed in the stationary frame and the rotating frame, respectively. The phase ... We present an experimental demonstration of the rotation measurement using a compact cold atom gyroscope. Atom interference fringes are observed in the stationary frame and the rotating frame, respectively. The phase shift and contrast of the interference fringe are experimentally investigated. The results show that the contrast of the interference fringe is well held when the platform is rotated, and the phase shift of the interference fringe is linearly proportional to the rotation rate of the platform. The long-term stability, which is evaluated by the overlapped Allan deviation, is 8.5 × 10^-6 rad/s over the integrating time of 1000s. 展开更多
关键词 of on as is in Continuous Dynamic Rotation Measurements Using a Compact cold Atom Gyroscope
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Effects of Low Temperature Stress and INA Bacteriaon Chlorophyll a Fluorescence Induction Kineticsin Young Fruit of Two Apricot Cultivars 被引量:3
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作者 YANG Jian-min , MENG Qing-rui, PENG Wei-xiu, WANG Xue-dong , ZHANG Yuan-hui , SUN Fu-zai, ZHAO Ting-chang and LI Shao-hua(College of Forestry , Hebei Agricultural University, Baoding 071000 , P. R. China Institute of Plant Protection ,Chinese Aeademy of Argricultural Sciences , Beijing 100094 , P. R. China College of Horticultural Sciences ,China Agricultural University , Beijing 100094 , P. R. China) 《Agricultural Sciences in China》 CAS CSCD 2002年第12期1344-1349,共6页
Effects of low temperature and INA bacteria on the change of chlorophyll a fluorescence in young fruit from two apricot cultivars were investigated. Low temperature decreased the potential activity (Fv/ Fo), conversio... Effects of low temperature and INA bacteria on the change of chlorophyll a fluorescence in young fruit from two apricot cultivars were investigated. Low temperature decreased the potential activity (Fv/ Fo), conversion efficiency of primary light energy (Fv/Fm)of PS II and photochemical quenching (qP) in young fruit of two apricot cultivars. Low temperature enhanced non-photochemical quenching qN, decreasing the quantum yield of photosynthetic electron transfer. The presence of ice nucleating active (INA) bacteria intensified the effects of low temperature, raised the injury temperature threshold from - 4℃ to - 2 - - 3℃. INA bacteria can be a factor to induce frost susceptibility of apricot fruit. The amount of damaged PS I activity center was related to apricot fruit size and cultivar. 展开更多
关键词 APRICOT Young fruit Chlorophyll a fluorescence PS II activity center QP qN cold resistance Ice nucleating active bactetia
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