|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | OBSERVATION AND MODEL ANALYSES OF POSITIVE CLOUD-TO-GROUND LIGHTNING IN MESOSCALE CONVECTIVE SYSTEMS显示文摘The analyses of spatial and temporal characteristics of positive cloud-to-ground(CG)lightning for four mesoscaleconvective systems and two severe local convective systems in 1989 and 1990 show that positive CG flash rate usuallyhas two peak values.The major peak occurs during the developing stage of the storm and most of the positive CGflashes originate at the lower part of the storm.The minor occurs during the dissipative stage of the storm and most ofthe positive CG flashes originate at the upper part of the storm,especially in the region of the wind divergence in thestorm anvil.The positive CG flash rate is almost an order of magnitude larger in the developing stage than in thedissipative stage.The appearing time of the peak of negative CG flash rate is in accordance with that of the valley of pos-itive CG flash rate.The higher the intensity of the radar echo,the higher the positive CG flash rate.Most of the positive CG flashes oc-cur when the weak echo area is larger,and mostly originate in the region where the radar echo intensity is about 10dBzand in the back region of the moving storms.The spatial distribution of the positive CG flashes is much more dispersivethan that of the negative.The mesoscale analysis reveals a bipolar lightning pattern.The mean bipole--length reaches itsminimum during the mature stage of the storm and reaches the maximum during the developing stage of the storm.The vertical distribution of the charge density is calculated by a one-dimensional charging model.Then,we discussthe producing condition of the positive CG lightning and forming cause of charge structure mentioned above. | Yan Muhong Guo Changming Qie Xiushu Ge Zhengmo Zhang Guangshu Lanzhou Institute of Plateau Atmospheric Physics,Academia Sinica,Lanzhou 730000 | 1992 | Acta meteorologica Sinica1992，6，4： | 16 |
| 2 | Study of charge structure and radiation characteristic of intracloud discharge in thunderstorms of Qinghai-Tibet Plateau显示文摘The comprehensive observations on lightning discharges were conducted in Naqu area of Qinghai-Tibet Plateau in summer of 2002. The electric structures of thunderstorms and the characteristics of lightning discharges at initial stage were analyzed by using the observation data. The results show that most of intracloud (IC) lightning flashes were polarities inverted in thunderstorms with tripole electric charge structure and occurred between negative charge region located in the middle of the thunderstorm and positive charge region located at the bottom of the thunderstorm. The radiation characteristics of discharge processes in cloud with longer lasting time involved in Cloud-to-Ground (CG) lightning flashes were similar to that of IC discharges.A lot of radiation pulses were produced in these discharge processes. Because the IC discharges took place at the bottom of thundercloud and were near the ground, they may produce more serious damage to equipment on the ground therefore should not be neglected in lightning protection. | ZHAGN Yijun DONG Wansheng ZHAO Yang ZHANG Guangshu ZHANG Hongfa CHEN Chengpin ZHANG Tong | 2004 | Science China Earth Sciences2004，47，z1： | 16 |
| 3 | Observation and study on the whole process of cloud-to-ground lightning using narrowband radio interferometer显示文摘A narrowband radio interferometer has been developed and used to locate the entire sources of VHF radiations from a negative cloud-to-ground (CG) lightning discharge which contains 19 strokes. This system uses five antennas to form an array consisting of short- and long-baselines along two or- thogonal directions. The system error which comes from frequency conversion is reduced by phase detection through direct high frequency amplifying. An interactive graphic analysis procedure is used to remove the fringe ambiguities which exist inherently in interferometry and to determine the direction of lightning radiation sources in two dimensions (azimuth and elevation) as a function of time at a time resolution of microsecond orders. With the developed system, the whole progression process in time and space of a lightning flash can be reconstructed. In this paper, combining the synchronous data of electric filed change and VHF radiation, the whole processes of an example negative CG flash have been studied in detail. It is found that the preliminary breakdown event of the CG flash started from negative charge region and exhibited firstly a downward pregression and then an upward propagation. There were very intense and continuous radiations during stepped leaders which became much stronger when the first return stroke began. In contrast, there were less and only discrete radiations during dart leaders. Stepped leader and dart leader may transform to each other depending on the state of the ionization of the path. The progression speed of initial stepped leaders was about 105 ms?1, while that was about 4.1×106 and 6.0×106 ms?1 for dart leaders and dart-stepped leaders, respectively. M events produced hook-shaped field changes accompanied by active burst of radiations at their begin- nings. Followed these active radiation processes, M events appeared to contact finally into conducting main discharge channels. The mean progression speed of M events was about 7×107 ms?1, greater than that of the dart leaders and dart-step leaders. K events and attempted leaders were essentially the same as dart leaders except that they could not reach the ground and initiate return strokes. | ZHANG GuangShu ZHAO YuXiang QIE XiuShu ZHANG Tong WANG YanHui CHEN ChengPin | 2008 | Science China Earth Sciences2008，51，5： | 9 |
| 4 | Red sprites over thunderstorms in the coast of Shandong Province,China显示文摘Red sprites, different from lightning flashes occurring in the troposphere, are large and brief dis-charges which appear in the altitude range from about 40 to 90 km above large thunderstorms and are usually caused by cloud-to-ground lightning discharges (CGs). A total of 17 sprites over two thunder-storms were first observed during the summer of 2007. One of the sprites occurred on July 28 above a thunderstorm in Guan County and the center of the storm was about 272 km from the observation site. The other sprites were recorded at the late night of August 1 and in the early morning of August 2, and the storm center was about 315 km away. All of the observed sprites occurred in cluster, and their appearances were very different, including 'columniform sprites', 'columniform sprites' with angel-like wings, 'carrot sprites', 'dancing sprites', etc. The duration of the sprites varied from a minimum of 40 ms to a maximum of 160 ms with a geometric mean (GM) of 61 ms. The time delay between parental positive cloud-to-ground lightning flashes (+CGs) and the associated sprites varied from 3.4 to 11.8 ms with a GM of 7.1 ms. The ratio of the number of +CGs to the total number of CGs during the time period with sprites was 7 times larger than that when no sprites occurred. Sprites did not appear fre-quently at the time when the convective activity is strong but when the thunderstorm starts to become weak. | YANG Jing QIE XiuShu ZHANG GuangShu ZHAO Yang ZHANG Tong | 2008 | Chinese Science Bulletin2008，53，7： | 8 |
| 5 | Large selenium isotopic variations and its implication in the Yutangba Se deposit, Hubei Province, China显示文摘The selenium isotopic ratios have been measured in the Yutangba Se deposit, Hubei Province, China. The results show that the δ 82/76SeNIST values vary from -12.77‰ to 4.93‰, which is the largest Se iso- topic variation found so far in natural terrestrial samples. The sample Ytb-5 of high-selenium carbona-ceous shale has the lightest Se isotopic composition with a δ 82/76SeNIST value of -12.77‰. On the basis of variations of Se isotope in the deposit along with other geological and geochemical evidence, the 'redox model' is suggested to favor the explanation of the occurrence of native Se in the deposit. The application to the Yutangba Se deposit with the discovery of large Se isotopic fractionation for natural samples indicates the potential of Se isotope as a new geochemical tracer. | WEN HanJie Jean CARIGNAN HU RuiZhong FAN HaiFeng CHANG Bin YANG GuangShu | 2007 | Chinese Science Bulletin2007，52，17： | 5 |
| 6 | Estimate of NO_X production in the lightning channel based on three-dimensional lightning locating system显示文摘Based on the VHF lightning locating system,a three-dimensional-space cell-gridded approach is used to extract the lighting channel and calculate the length of the channel.Through clustering of the located radiation sources and then extracting the lightning channel,it can accurately obtain the length of the channel.To validate the feasibility of the approach,a simulation experiment is designed,and it shows the length error is no more than 10%.The relationship between the NO production of per unit arc length and atmospheric pressure obtained in laboratory is applied to the NOX production of per unit flash length at different altitudes in this paper.The channel length and the NOX production of 11 negative cloud-to-ground flashes and 59 intracloud flashes in an isolated thunderstorm in the northeastern Qinghai-Tibet Plateau are calculated.The results show that the average channel lengths of per cloud-to-ground and intracloud flash are 28.9 and 22.3 km respectively;the average NOX productions of per cloud-to-ground and intracloud flash are 1.89×1025 and 0.42×1025 molecules,respectively. | ZHANG Rong ZHANG GuangShu LI YaJun WANG YanHui WU Bin YU Hai LIU YanXiu | 2014 | Science China Earth Sciences2014，57，7： | 4 |
| 7 | Experimental study on location accuracy of a 3D VHF lightning-radiation-source locating network显示文摘This paper reports the investigation of the location accuracy of a three-dimensional(3D) lightning-radiation-source locating system using sounding balloon measurements. By comparing the information from the balloon-borne VHF transmitter flight path and locations using simple geometric models, the location uncertainties of sources both over and outside the network were estimated. For radiation sources inside the network and below an altitude of 7 km, the horizontal uncertainty was 12–48 m and the total mean value was 21 m(rms), and the vertical uncertainty was 20–78 m and the total mean value was 49 m(rms). Outside the network, the location uncertainties increased with distance. The geometric model showed that range and altitude errors increased as a function of the range squared whereas the range errors increased parabolically with distance, and that was confirmed by the covariance calculation results. The standard deviation was used inside the network and covariance was used outside the network. The results indicated that location errors from a simple geometric model exhibited good agreement with standard experimental data. The geometry of the network, set of measurements, and calculation method were verified as suitable. The chi-square values of the least squares goodness of fit algorithm were verified and the timing error(?trms) of the fitting formula was estimated. The distribution of the chi-square values was less than 5, corresponding to a timing error of 50–66 ns(rms). | ZHANG GuangShu LI YaJun WANG YanHui ZHANG Tong WU Bin LIU YanXiu | 2015 | Science China Earth Sciences2015，58，11： | 3 |
| 8 | Electrical characteristics of thunderstorms in different plateau regions of China显示文摘 | Xiushu Qie Tinglong Zhang Guangshu Zhang Tong Zhang Xiangzhen Kong | 2008 | Atmospheric Research2008，，2： | 2 |
| 9 | Changes in EEG measurements in intractable epilepsy patients with neurofeedback training显示文摘To assess the effects of neurofeedback on brain electrophysiology and to determine how biofeedback works,power spectral density (PSD) and approximate entropy(ApEn) analyses are applied to the EEGs of six patients with intractable epilepsy who received neurofeedback training.After sessions of treatment,the EEG sensorimotor rhythm to theta PSD ratio calculated from the C4 electrode site becomes larger than that before the treatment,which is consistent with the biofeedback protocol.The ApEn over 16-channel EEG recordings all increase to different degrees.Larger increases occur in channels located near the training position(C4).All these results suggest that these EEG measurements are new criteria that can be used to evaluate the effect of neurofeedback. | Longlian Zhao Wenqing Wu Zuoqing Liang Guangshu Hu | 2009 | Progress in Natural Science:Materials International2009，19，11： | 2 |
| 10 | Improvement of the classification accuracy in discriminating diabetic retinopathy by multifocal electroretinogram analysis显示文摘多焦点的网膜电图(mfERG ) 是一件最新发达的电镀物品生理的技术。在这篇论文,一个分类方法用 mfERG 数据为糖尿病的 retinopathy 的早诊断被建议。MfERG 记录在不同阶段与糖尿病从健康个人和病人的眼睛被获得。为每个 mfERG 记录, 103 本地回答被提取。所有 mfERG 本地人回答上的每个点的振幅价值被看起来象一个潜在的特征分类试验性的题目。特征子集被比较 inter-intra 距离从特征空间选择。基于选择特征子集,菲希尔的线性分类器被训练。并且记录的最后的分类决定被投票成为所有分类器的产量。使用方法分类所有试验性的题目,很低的错误率被完成。糖尿病的 retinopathy 分类方法的一些关键性质也被讨论。 | Xu Jin Hu Guangshu Huang Houbin | 2007 | Progress in Natural Science:Materials International2007，17，8： | 2 |
| 11 | Genesis of the Nanyangtian scheelite deposit in southeastern Yunnan Province,China: evidence from mineral chemistry,fluid inclusions,and C–O isotopes显示文摘The Nanyangtian skarn-type scheelite deposit is an important part of the Laojunshan W–Sn polymetallic metallogenic region in southeastern Yunnan Province,China. The deposit comprises multiple scheelite ore bodies;multilayer skarn-type scheelite ore bodies are dominant,with a small amount of quartz vein-type ore bodies. Skarn minerals include diopside, hedenbergite, grossular, and epidote. Three mineralization stages exist: skarn, quartz–scheelite, and calcite. The homogenization temperatures of fluid inclusions in hydrothermal minerals that formed in different paragenetic phases were measured as follows:221–423℃ (early skarn stage), 177–260℃ (quartz–scheelite stage), and 173–227℃ (late calcite stage). The measured salinity of fluid inclusions ranged from 0.18% to16.34% NaCleqv(skarn stage), 0.35%–7.17% NaCleqv(quartz–scheelite stage), and 0.35%–2.24% NaCleqv(late calcite vein stage). Laser Raman spectroscopic studies on fluid inclusions in the three stages showed H_2O as the main component, with N_2 present in minor amounts. Minor amounts of CH_4 were found in the quartz–scheelite stage. It was observed that the homogenization temperature gradually reduced from the early to the late mineralization stages; moreover, δ^(13)C_(PDB) values for ore-bearing skarn in the mineralization period ranged from -5.7‰ to-6.9‰ and the corresponding δ^(18)O_(SMOW) values ranged from 5.8‰ to 9.1‰, implying that the ore-forming fluid was mainly sourced from magmatic water with a minor amount of meteoric water. Collectively, the evidence indicates that the formation of the Nanyangtian deposit is related to Laojunshan granitic magmatism. | Qianru Cai Yongfeng Yan Guangshu Yang Fuju Jia Chao Li | 2018 | Acta Geochimica2018，37，4： | 2 |
| 12 | The Application of X-STR: Two Case Reports显示文摘 | Zhengliang Yu Jing Sun Guangshu Ding Xi Wang Hong Liu Xingchun Zhao Wanshui Li | 2018 | Journal of Pharmacy and Pharmacology2018，6，9： | 2 |
| 13 | Unsupervised feature selection bykernel density estimation in wavelet-based spike sorting 显示文摘 | Ceng Xinling Hu Guangshu | 2012 | Biomed Signal Proces2012，7，2： | 1 |
| 14 | Real-time implementation of a new low-memory SPIHT image coding algorithm using DSP chip 显示文摘 | Sun Yong Zhang Hui Hu Guangshu | 2002 | IEEE Trans on Image Processing2002，11，9： | 1 |
| 15 | A muhiwin- dow partial buffering scheme for FPGA--Based 2- D Convolvers显示文摘 | Zhang Hui Xia Mingxin Hu Guangshu | 2007 | IEEE Transactions on Circuits and Sys- tems Ⅱ: Express Briefs2007，54，2： | 1 |
| 16 | Real-time implementation of a new low-memory SPIHT image coding algorithm using dsp chip显示文摘 | Yong Sun Hui Zhang Guangshu Hu | 2002 | IEEE Transactions on Image Processing2002，11，9： | 1 |
| 17 | Sparse representation-based heartbeat classification using independent component a- nalysis显示文摘 | Huang Huifang Hu Guangshu Zhu Li | 2012 | Journal of Medical Systems2012，36，3： | 1 |
| 18 | An evolutionary game theoretic perspective on e-collaborationg:The collaboration effort and media relativeness显示文摘 | Guangshu cai Ned kock | 2009 | European Journal of operational Research2009，194，： | 1 |
| 19 | Digital Signal Processing显示文摘 | Zong Kongde Hu Guangshu | 1998 | Beijing: Tsinghua Universinty Publisher1998，，： | 1 |
| 20 | Real-time base-line drift correction and P wave detection of ECG signal 显示文摘 | LI Huijun HU Guangshu ZHOU Liguo | 1989 | Space Medicine & Medical Engineering1989，2，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员