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STRUCTURE　OF　GANODERIC　ACID　DM，A　NEW　TRITERPENOID　FROM　THE　FRUITING　BODY　OF　GANODERMA　LUCIDUM

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Chinese Chemical Letters 1995年第12期6卷 1051-1052页

作者： cai, H Wang, FS Yang, JS Zhang, YM Univ Agr & Anim Sci PLA Changchun 130062 Peoples R China Chinese Acad Med Sci Inst Med Plant Dev Beijing 100094 Peoples R China

A new lanostane-type triterpenoid, ganoderic acid DM was isolated from the cultured fruiting body of G. lucidum. The structure of ganoderic acid DM (1) was determined by spectral data. It was ldentifled as 3. 7-dioxo-... 详细信息

关键词： ACID BODY DM

Studies on the anti-angiogenic activity of PEDF34 and its molecular mechanism

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Studies on the anti-angiogenic activity of PEDF34 and its mo...

The next detectors for gravitational wave astronomy

中国生物化学与分子生物学会第十届会员代表大会暨全国学术会议

作者： qing Gong Xia Yang Zhonghan Yang Weibin cai Guoquan Gao Department of Biochemistry Zhongshan Medical School of Sun Yat-Sen University

Objective The aim of this study is to observe the effect of PEDF34(a functional peptide of PEDF) on angiogenesis and tumor growth in xenografted prostate carcinoma athymic mouse model and to explore the effect and the potent mechanism of PEDF34 on endothelial cells. Materials and Methods Human PEDF34 cDNA was obtained by PCR and and the PEDF34-GST fusion protein was produced using pGEX-4T-l/ BL21(DE3) prokaryotic expression *** fusion protein was purified by passing through the GST-Binding column and identified by SDS-PAGE electrophoresis and Western ***

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Science China(Physics,Mechanics & Astronomy) 2015年第12期58卷 91-124页

作者： BLAIR David JU Li ZHAO ChunNong WEN Linqing MIAO HaiXing cai RongGen GAO JiangRui LIN XueChun LIU dong WU Ling-An ZHU ZongHong HAMMOND Giles PAIK Ho Jung FAFONE Viviana ROCCHI Alessio BLAIR Carl MA YiQiu QIN JiaYi PAGE Michael School of Physics The University of Western Australia School of Physics and Astronomy University of Birmingham State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences The School of Physics & Electronic Engineering Shanxi University Laboratory of All-Solid-State Light Sources Institute of Semiconductors Chinese Academy of Science State Key Laboratroy of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Gravitational Wave and Cosmology Laboratory Department of Astronomy Beijing Normal University School of Physics and Astronomy SUPA University of Glasgow Department of Physics University of Maryland College Park University of Rome Tor Vergata INFN Roma Tor Vergata

This paper focuses on the next detectors for gravitational wave astronomy which will be required after the current ground based detectors have completed their initial observations, and probably achieved the first direct detection of gravitational waves. The next detectors will need to have greater sensitivity, while also enabling the world array of detectors to have improved angular resolution to allow localisation of signal sources. Sect. 1 of this paper begins by reviewing proposals for the next ground based detectors,and presents an analysis of the sensitivity of an 8 km armlength detector, which is proposed as a safe and cost-effective means to attain a 4-fold improvement in sensitivity. The scientific benefits of creating a pair of such detectors in China and Australia is emphasised. Sect. 2 of this paper discusses the high performance suspension systems for test masses that will be an essential component for future detectors, while sect. 3 discusses solutions to the problem of Newtonian noise which arise from fluctuations in gravity gradient forces acting on test masses. Such gravitational perturbations cannot be shielded, and set limits to low frequency sensitivity unless measured and suppressed. Sects. 4 and 5 address critical operational technologies that will be ongoing issues in future detectors. Sect. 4 addresses the design of thermal compensation systems needed in all high optical power interferometers operating at room temperature. Parametric instability control is addressed in sect. 5. Only recently proven to occur in Advanced LIGO, parametric instability phenomenon brings both risks and opportunities for future detectors. The path to future enhancements of detectors will come from quantum measurement technologies. Sect. 6 focuses on the use of optomechanical devices for obtaining enhanced sensitivity, while sect. 7 reviews a range of quantum measurement options.

关键词： future gravitational wave detectors opto-mechanics quantum limit

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铅与牛血清蛋白的相互作用及模拟透析性能

河南科技大学学报（自然科学版） 2009年第6期30卷 79-81,86页

作者：蔡青青聂伟梁莹董铁有河南科技大学化工与制药学院郑州大学公共卫生学院河南郑州450001 河南科技大学环境工程研究所河南洛阳471003

用与人血清白蛋白相似性很强的牛血清白蛋白作为模拟血液,利用红外光谱法对铅与牛血清蛋白(模拟血液)的相互作用情况进行研究,使用原子吸收法和电导率仪对模拟血液反应体系中铅的浓度和电导率进行检测,利用透析法进行含铅模拟血液除铅... 详细信息

用与人血清白蛋白相似性很强的牛血清白蛋白作为模拟血液,利用红外光谱法对铅与牛血清蛋白(模拟血液)的相互作用情况进行研究,使用原子吸收法和电导率仪对模拟血液反应体系中铅的浓度和电导率进行检测,利用透析法进行含铅模拟血液除铅试验。结果表明,含铅模拟血液的电导率降低,铅与牛血清蛋白发生了络合反应,甲基峰和亚甲基峰也出现了明显变化。透析法能降低反应体系中铅的浓度,利用纤维膜的吸附作用,能有效的吸附铅与牛血清蛋白作用后的大分子络合物,使得铅的去除率高达90%。

关键词：红外光谱法透析铅牛血清蛋白模拟血液电导率

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煤吸附解吸甲烷细观结构变形试验研究

煤炭学报 2016年第9期41卷 2238-2245页

作者：周动王辰冯增朝赵东蔡婷婷太原理工大学原位改性采矿教育部重点实验室山西太原030024

利用扫描电镜与CT扫描相结合的方法,通过对直径为8.5 mm的细观煤样进行不同压力下的吸附解吸甲烷试验,研究其内部细观结构的变形规律。研究表明,煤样是煤基质中含有少量黏土矿物质的天然非均质岩体;吸附解吸甲烷过程中,煤的细观结构变... 详细信息

利用扫描电镜与CT扫描相结合的方法,通过对直径为8.5 mm的细观煤样进行不同压力下的吸附解吸甲烷试验,研究其内部细观结构的变形规律。研究表明,煤样是煤基质中含有少量黏土矿物质的天然非均质岩体;吸附解吸甲烷过程中,煤的细观结构变形分为膨胀变形(密度减小)与挤压变形(密度增大)。低吸附压力下,含黏土矿物质区域急剧膨胀,对邻近煤基质形成局部挤压,细观变形程度明显,压力升高后膨胀变形增强,挤压变形减弱;不含黏土矿物质的煤基质区域变形程度较低,近似于均匀变形。解吸后,煤不同区域的变形恢复能力与其非均匀程度有关,非均匀性越强,其变形恢复能力越差。

关键词：吸附膨胀挤压黏土矿物质 CT

A Two-Stage Time-Optimal Trajectory Planning Algorithm with No Inverse Kinematics for Manipulator

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A Two-Stage Time-Optimal Trajectory Planning Algorithm with ...

基于卫星测高数据的2002~2018年太湖水位变化监测

第43届中国控制会议

作者： Wensong Fan Tao cai Kebing Lu Panpan Yang Haimei qing National Key Lab of Autonomous Intelligent Unmanned Systems Beijing Institute of Technology School of Automation Beijing Institute of Technology

This paper studies the time-optimal trajectory planning for manipulator. Conventional time-optimal trajectory planning utilizes the inverse solution, interpolation and intelligent optimization algorithms to search for the shortest time, making the process rather complex. To address this issue, we incorporate the kinematic equations and state transition equations into the existing Two-Stage algorithm used in unmanned aerial vehicles(UAVs), resulting in significantly improved computational speed and accuracy of the robotic arm's operation. The first stage predefines some resulting points related to path points and optimizes the robotic arm's kinematics and motion constraints as soft constraints to provide an initial solution for the second stage. In the second stage, based on the predetermined points of each trajectory segment provided by the first stage, the optimization problem is solved without the need for kinematic inverse solutions, in which the time intervals of each trajectory segment serve as optimization variables and the robotic arm's kinematics and motion constraints are used as hard constraints for optimization. Subsequently, the obtained joint points are interpolated using fifth-degree polynomials to form continuous joint trajectories. Comparative experiments with an improved particle swarm optimization algorithm verify that the proposed method exhibits higher optimization efficiency and achieves shorter optimized times.

关键词： Manipulator Time-Optimal Trajectory Planning Two-Stage Algorithm Kinematics

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中国环境科学 2022年第3期42卷 1295-1308页

作者：常翔宇蔡宇柯长青南京大学地理与海洋科学学院江苏南京210023 南京大学自然资源部国土卫星遥感应用重点实验室江苏南京210023

针对传统水位监测方法的弊端以及太湖水位变化监测的现实需求,基于Envisat和Cryosat-2测高数据,采用Morlet小波分析、Mann-Kendall检验法研究2002年6月~2018年12月近20a的水位以及周期变化,并应用实测数据进行精度验证,从气象因素和人... 详细信息

针对传统水位监测方法的弊端以及太湖水位变化监测的现实需求,基于Envisat和Cryosat-2测高数据,采用Morlet小波分析、Mann-Kendall检验法研究2002年6月~2018年12月近20a的水位以及周期变化,并应用实测数据进行精度验证,从气象因素和人为影响两方面分析其不同时间尺度的变化趋势以及原因.结果表明:Evnisat/RA2L2GDR数据和Cryosat-2/SIRAL L2GDR数据测量精度较高,与实测水位的季、年尺度相关系数分别为0.559和0.845,可以进行长时间序列水位变化的监测;多年来太湖平均水位1.379m,最高水位为2016年6月的2.252m,最低水位为2011年10月的0.832m,每年1~4月水位逐渐上涨,在6月前后达到峰值,此后开始下降,在年末出现轻微抬升,且太湖春季水位最高,夏季最低,极差0.041m;在太湖近20a的水位变化中存在10~20个月、15~30个月以及40~60个月3类尺度的周期变化规律,且40~60个月时间尺度的周期变化最为强烈;以2015年4月份为分界点,在此之前水位呈显著下降趋势,此后水位呈上升趋势,并且在2003年3月与2004年12月水位发生显著突变;21世纪前10a太湖水位主要受控于气象因素,此后人为干预的影响逐渐加剧,使其与自然状态呈现出不一样的规律.

关键词：卫星测高水位变化 Envisat/RA-2 Cryosat-2 太湖

Theoretical Study on the Mechanism of Aromatic-Ring-Cleavage Activity by Gentisate-1,2-dioxygenase

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Theoretical Study on the Mechanism of Aromatic-Ring-Cleavage...

Buffer structure optimization of the photoacoustic cell for trace gas detection

中国化学会第十二届全国物理有机化学学术会议

作者： Qiuxian Li qing’An Qiao Lixiang Sun Honglan cai Xiaofang Qin School of Chemistry and Materials Science Ludong University

Gentisate-1,2-dioxygenase（GDO） is one type of nonheme iron enzyme which belongs to the cupin *** catalyzes a number of oxidative C-C bond cleavage reactions in the biodegradation of toxic and xenobiotic compounds.A biomimetic iron（II） complex,[（hydrotris（3,5-diphenylpyrazole-1-yl）borate）FeII（hydrotris（3,5-diphenylpyrazole-1-yl）borate）],which represents a functional model of GDO was investigated by Density Function Theory（DFT）.The iron（II） 1,4-dihydroxy-2-naphthoate complex combined with dioxygen to generate the corresponding iron（III） species,and then another dioxygen will be added to form an iron（III） superoxide *** superoxide can attack the C1 carbon of the carboxysemiquinonato group to form an alkylperoxide *** p-hydroxy group on the aromatic ring passes by the O-O cleavage of the alkylperoxo intermediate to form an anhydride intermediate through ***,the metal-coordinated hydroxide participates in the hydrolysis of the anhydride species to afford the ring cleavage product.

关键词： GDO Mechanism Aromatic-Ring-Cleavage Activity

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Optoelectronics Letters 2013年第3期9卷 233-237页

作者： cai Yang Norhana Arsad LI Min WANG Yao Department of Physics Wuhan University of Technology Wuhan 430070 China Department of Electric Electronics & System Engineering Faculty of Engineering & Built Environment UniversitiKebangsaan Malaysia Selangor 43600 Malaysia

The equivalent four-pole network model is used to simulate one-dimension longitudinal acoustic resonator with different buffer diameters and lengths, aiming to reach a theoretic model which is able to estimate the optimal buffer geometry. In experiments, the buffer volumes are decreased gradually by filling a set of aluminum rings with different inner diameters and lengths into the buffers to get the desired dimensions. The experimental results show that the average deviation of 1.1% is obtained between the experimental results and the theoretical simulation at the buffer length of 30 mm. Experiments show that the minimum background signal occurs when the buffer length is equal to a quarter of the acoustic wavelength (λ/4). The amplitude of the photoacoustic signal is barely influenced when dbuf>3dres. Considering that oversize of photoacoustic cell needs more measuring gas and more material, the buffer diameter can be deduced to dbuf≈3dres. Therefore, smaller photoacoustic cell is desirable.

关键词：缓冲液光声池结构优化痕量检测气体网络模型理论模拟光声信号