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OH气辉对重力波响应的模式研究 被引量:2
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作者 王咏梅 王英鉴 《地球物理学报》 SCIE EI CAS CSCD 北大核心 1998年第4期455-462,共8页
重力波是中间层大气的重要能量来源,气辉观测为研究中间层重力波特性提供了极好的方法。本文利用最新的 OH 气辉激发机制,建立了一个较完整的光化、动力模式来分析重力波传播对 OH 气辉的影响。结果表明,化学反应速率系数不定性对 Krass... 重力波是中间层大气的重要能量来源,气辉观测为研究中间层重力波特性提供了极好的方法。本文利用最新的 OH 气辉激发机制,建立了一个较完整的光化、动力模式来分析重力波传播对 OH 气辉的影响。结果表明,化学反应速率系数不定性对 Krassovsky 比振幅的影响较小,但淬灭过程的影响必须考虑。Krassovsky 比的振幅和相位均依赖于波周期,其振幅在2.1和10.3之间变化;这表明 OH 气辉亮度的相对变化大于温度的相对变化。一般情况下,重力波引起的温度扰动超前于气辉亮度的变化。与实测资料比较发现,两者变化趋势基本一致,在短周期波时吻合较好。 展开更多
关键词 OH气辉 重力波 动力模式 短周期波 高层大气
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人为活动对高平流层、中间层大气的影响 被引量:2
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作者 王英鉴 《空间科学学报》 CAS CSCD 北大核心 1996年第1期71-77,共7页
利用一维光化、辐射耦合模式研究了人为活动所排放出的废弃物CH4、N2O和CO2含量增加对高平流层、中间层大气的影响.结果指出,对流层中这些气体增加一倍将导致上中层大气水汽、O3和温度的明显变化.CO2含量增加将使上中... 利用一维光化、辐射耦合模式研究了人为活动所排放出的废弃物CH4、N2O和CO2含量增加对高平流层、中间层大气的影响.结果指出,对流层中这些气体增加一倍将导致上中层大气水汽、O3和温度的明显变化.CO2含量增加将使上中层温度降低约10K;而CH4含量的加倍不仅使中层顶附近水汽含量增加50%以上、也使其温度有更明显的下降,这将更有利于夜光云的形成. 展开更多
关键词 人为活动影响 中层 大气 光化模式 平流层
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Simulating leaf net CO_2 assimilation rate of C_3 & C_4 plants and its response to environmental factors 被引量:1
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作者 张佳华 姚凤梅 《Journal of Forestry Research》 SCIE CAS CSCD 2001年第1期9-12,共5页
Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf ph... Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf photosynthesis, three numerical sensitivity experiments were carried out. We simulated the sing le leaf net CO2 assimilation, which acts as a function of different light, carbo n dioxide and temperature conditions. The relationships between leaf net photosy nthetic rate of C3 and C4 plant with CO2 concentration intercellular, leaf tempe rature, and photosynthetic active radiation (PAR) were presented, respectively. The results show the numerical experiment may indicate the main characteristic o f plant photosynthesis in C3 and C4 plant, and further can be used to integrate with the regional climate model and act as land surface process scheme, and bett er understand the interaction between vegetation and atmosphere. 展开更多
关键词 Photosynthesis model Net CO2 assimilation rate C3 and C4 plants Num erical simulation
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Simulating leaf net CO2 assimilation rate of C3 & C4 plants and its response to environmental factors 被引量:1
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作者 张佳华 姚凤梅 《Journal of Forestry Research》 CAS CSCD 2001年第1期9-12,75,共页
Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf ph... Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf photosynthesis, three numerical sensitivity experiments were carried out. We simulated the sing le leaf net CO2 assimilation, which acts as a function of different light, carbo n dioxide and temperature conditions. The relationships between leaf net photosy nthetic rate of C3 and C4 plant with CO2 concentration intercellular, leaf tempe rature, and photosynthetic active radiation (PAR) were presented, respectively. The results show the numerical experiment may indicate the main characteristic o f plant photosynthesis in C3 and C4 plant, and further can be used to integrate with the regional climate model and act as land surface process scheme, and bett er understand the interaction between vegetation and atmosphere. 展开更多
关键词 Photosynthesis model Net CO2 assimilation rate C3 and C4 plants Num erical simulation
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A Real-time Modeling of Photovoltaic Array 被引量:3
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作者 王魏 李柠 李少远 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第6期1154-1160,共7页
This paper mainly aims at the modeling problem of the photovoltaic (PV) array with a 30 kW PV grid-connected generation system. An iterative method for the time-varying parameters is proposed to model a plant of PV ar... This paper mainly aims at the modeling problem of the photovoltaic (PV) array with a 30 kW PV grid-connected generation system. An iterative method for the time-varying parameters is proposed to model a plant of PV array. The relationship of PV cell and PV array is obtained and the solution for PV array model is unique. The PV grid-connected generation system is used to demonstrate the effectiveness of the proposed method by comparing the calculated values with the actual output of the system. 展开更多
关键词 photovoltaic array MODELING incident angle of the sun radiation intensity
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SUSY QCD Impact on Top-Pair Production Associated with a Z^0-Boson at a Photon-Photon Collider
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作者 DONG Chuan-Fei MA Wen-Gan ZHANG Ren-You GUO Lei WANG Shao-Ming 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第8期302-310,共9页
The top-pair production in association with a Z^0-boson at a photon-photon collider is an important process in probing the coupling between top-quarks and vector boson and discovering the signature of possible new phy... The top-pair production in association with a Z^0-boson at a photon-photon collider is an important process in probing the coupling between top-quarks and vector boson and discovering the signature of possible new physics. We describe the impact of the complete supersymmetric QCD (SQCD) next-to-leading order (NLO) radiative corrections on this process at a polarized or unpolarized photon collider, and make a comparison between the effects of the SQCD and the standard model (SM) QCD. We investigate the dependence of the lowest-order (LO) and QCD NLO corrected cross sections in both the SM and minimal supersymmetric standard model (MSSM) on colliding energy √s in different polarized photon collision modes. The LO, SM NLO, and SQCD NLO corrected distributions of the invariant mass of tt^--pair and the transverse momenta of final Z^0-boson are presented. Our numerical results show that the pure SQCD effects in γγ →tt^- Z^0 process can be more significant in the ++ polarized photon collision mode than in other collision modes, and the relative SQCD radiative correction in unpolarized photon collision mode varies from 32.09% to -1.89% when √s goes up from 500 GeV to 1.5 TeV. 展开更多
关键词 supersymmetric QCD photon-photon collider top-gauge boson coupling
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Multi-objective Genetic Optimization for LCLS-II X-ray FEL
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作者 Lanfa Wang Tor O. Raubenheimer 《Journal of Mechanics Engineering and Automation》 2014年第8期632-638,共7页
The LCLS-II (linac coherent light source II) will build on the success of the world's most powerful X-ray laser: the LCLS (linac coherent light source). It will add two new X-ray laser beams and room for additio... The LCLS-II (linac coherent light source II) will build on the success of the world's most powerful X-ray laser: the LCLS (linac coherent light source). It will add two new X-ray laser beams and room for additional new instruments, thus greatly increasing the number of experiments carried out each year. Multiple operation modes are proposed to accommodate a variety of user requirements. There are a large number of variables and objectives in the design. For each operation mode, MOGA (multi-objective genetic algorithm) is applied to optimize the machine parameters in order to minimize the jitters, energy spread, collective effects and emittance. 展开更多
关键词 MOGA OPTIMIZATION FEL (free-electron laser).
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The electromagnetic wave experiment for CSES mission: Search coil magnetometer 被引量:17
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作者 CAO JinBin ZENG Li +8 位作者 ZHAN Feng WANG ZuoGui WANG Yan CHEN Yu MENG QingChun JI ZhanQiang WANG PengFei LIU ZhongWei MA LingYu 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第5期653-658,共6页
The seismic activities on the Earth can produce a disturbance of the electromagnetic field and particles in the ionosphere. The search coil magnetometer(SCM) mounted on China Seismo-Electromagnetic satellite(CSES) is ... The seismic activities on the Earth can produce a disturbance of the electromagnetic field and particles in the ionosphere. The search coil magnetometer(SCM) mounted on China Seismo-Electromagnetic satellite(CSES) is designed to measure the magnetic field fluctuation of low frequency electromagnetic waves in the frequency range of 10 Hz–20 k Hz. The SCM comprises a three-axis search coil sensor mounted on a 4.5 m boom and an electronic box inside satellite module. The sampling rate of the SCM is 51.2 k Hz and the time resolution of the power spectrum density(PSD) is 2 s. The frequency resolution is 12.5 Hz.There are three operation modes: survey, detailed survey and calibration. In the survey mode, the SCM can provide a PSD in the whole frequency range of 10 Hz–20 k Hz and wave forms in the low frequency range below 2 k Hz while in the detailed survey mode the SCM can provide both PSD and wave forms in the whole frequency range of 10 Hz–20 k Hz. The sensitivity of the SCM instrument is 5.0×10^(-4) n T Hz^(-1/2) at 10 Hz, 5.0×10^(–5) n T Hz^(-1/2) at 200 Hz, 3.4×10^(-5) n T Hz^(-1/2) at 2 k Hz and 1.1×10^(-4) n T Hz^(-1/2) at 20 k Hz. The telemetry rate is ~0.85 Mbps in the survey mode and ~3.0 Mbps in the detailed survey mode. The phase difference between three axes can be made generally with a precision of less than 1.0°. The dynamic range of the SCM instrument is over 100 d B. The orthogonality of three mechanical axes of search coil senor is better than 0.13°. The performance of SCM can satisfy the requirement of scientific objectives of CSES mission. 展开更多
关键词 search coil magnetometer CSES electromagnetic wave earthquake precursor
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Profile-broaden ultraviolet lasing from whispering gallery mode cavity in crown-like zinc oxide 被引量:1
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作者 王马华 朱光平 +2 位作者 居勇峰 季仁东 付丽辉 《Optoelectronics Letters》 EI 2015年第2期103-106,共4页
The crown-like zinc oxide(Zn O)samples,which are composed of a hexagonal cap and a tower-like shaft,are prepared by vapor transport method.The hexagonal cap,working as a whispering gallery mode(WGM)resonant cavity,dem... The crown-like zinc oxide(Zn O)samples,which are composed of a hexagonal cap and a tower-like shaft,are prepared by vapor transport method.The hexagonal cap,working as a whispering gallery mode(WGM)resonant cavity,demonstrates density-dependent ultraviolet(UV)lasing emission with a broadened and squared photoluminescence(PL)profile under UV excitation at 355 nm.Theoretical analyses based on Fermi golden rule show that the broadened spectrum profile results from the special optical mode density characteristics in a WGM micro-cavity,which is in agreement with the observed results. 展开更多
关键词 Optical resonators Zinc Zinc oxide
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Melanopsin-expressing retinal ganglion cell loss and behavioral analysis in the Thy1-CFP-DBA/2J mouse model of glaucoma 被引量:4
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作者 ZHANG Qi VUONG Helen +4 位作者 HUANG Xin WANG YanLing BRECHA Nicholas C. PU MingLiang GAO Jie 《Science China(Life Sciences)》 SCIE CAS 2013年第8期720-730,共11页
In this study, the role of melanopsin-expressing retinal ganglion cells (mRGCs) in the glaucoma-induced depressive behavioral response pattern was investigated. The CFP-D2 transgenic glaucoma animal model from five ... In this study, the role of melanopsin-expressing retinal ganglion cells (mRGCs) in the glaucoma-induced depressive behavioral response pattern was investigated. The CFP-D2 transgenic glaucoma animal model from five age groups was used in this study. Immunohistochemical labeling, quantitative analysis of mRGC morphology, open field test (OFT), and statistical analysis were used. In comparison with C57 BL/6 mice, the age-matched CFP-D2 mice had significantly elevated intraocular pressure (lOP). We observed parallel morphological changes in the retina, including a reduction in the density of cyan fluorescent protein- (CFP) expressing cells (cells mm^-2 at 2 months of age, 1309±26; 14 months, 878±30, P〈0.001), mRGCs (2 months, 48_+3; 14 months, 19±4, P〈0.001), Brn3b-expressing RGCs (2 months, 1283±80; 14 months, 950±31, P〈0.001), Brn-3b expressing mRGCs (5 months, 50.17%±5.5%; 14 months, 12.61%±3.8%, P〈0.001), and reduction in the dendritic field size of mRGCs (mm^2 at 2 months, 0.077±0.015; 14 months, 0.065±0.015, P〈0.05). CFP-D2 mice had hyperactive locomotor activity patterns based on OFT findings of the total distance traveled, number of entries into the center, and time spent in the center of the testing apparatus. The glaucoma induced hyperactive response pattern could be associated with dysfunctional mRGCs, most likely Brn-3b-positive mRGCs in CFP-D2 mice. 展开更多
关键词 pigmentary glaucoma Thyl-CFP-DBA/2J mouse retinal ganglion cells melanopsin-expressing retinal ganglion cells depression
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