|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | FLOOD DISCHARGE AND ENERGY DISSIPATION BY JETS FROM OUTLETS IN HIGH ARCH DAM显示文摘In this thesis, the scale effect by an aerated water jet diffusing in the water upon the hydrodynamic pressure, the local riverbed scour by multiple layered jets and by those colliding in the vertical and the transverse directions, and the stability of the apron slab both in the inverted arch cushion pool and the flat bottom one by the large discharge and the high water head with 300m level are detailedly researched by means of model test and numerical simulation. A mathematic model simulating the destabilization of the flat bottomed slab is established to open out the mechanism of its stability. Both experimental researches both on the hydrodynamic pressure acted inside joints between the bedrock and the apron slab, and on forces at arch abutments in inverted arch cushion pool are carried out by using an advanced measurement and the imitation means to acquire the mechanism of the inverted arch pool to keep stability and its stability condition. | Ph.D.Candidate:Sun JianXi’an University of Technolgy, Xi’an 710048, ChinaSupervisor:Yu Changzhao (Tsinghua University, Beijing 100084, China)Li Yuzhu (Tsinghua University, Beijing 100084, China)Chen Changzhi (Tsinghua University, Beijing 100084, China)Members of Dissertation Defense Committee:Gao Jizhang (China Institute of Water Resources and Hydropower Research), ChairmanLi Guifen (China Institute of Water Resources and Hydropower Research)Cui Guangtao (Tianjing University)Wang Xingkui (Tsinghua University)Yu Changzhao (Tsinghua University)Li Yuzhu (Tsinghua University)Chen Changzhi (Tsinghua University) | 2003 | Journal of Hydrodynamics2003，15，1： | 39 |
| 2 | Current Situation of Heavy Metal Pollution in Farmland Soil and Phytoremediation Application显示文摘Phytoremediation technology is a newly-developed way of soil heavy metal pollution repair with high efficiency and good ecological comprehensive benefit. This paper briefly introduces the soil heavy metal pollution status at home and abroad,and focuses on the analysis of harm,sources and current situation of soil heavy metal pollution at home and abroad as well as mechanism and application of phytoremediation.Finally it discusses the key problems in phytoremediation technology that need to resolve in the future. | Yanfei HUANG Guifen CHEN Liumei XIONG Yuyi HUANG | 2016 | Asian Agricultural Research2016，8，1： | 15 |
| 3 | 哮喘-慢性阻塞性肺疾病重叠的研究进展显示文摘支气管哮喘和慢性阻塞性肺疾病(COPD)是2种不同的慢性气道炎性反应性疾病,两者在病因、发病年龄、病理生理、治疗和预后方面存在差异。然而,临床发现部分具有慢性气道炎性疾病的患者可同时具有以上2种疾病的特点,临床多将其描述为哮喘一慢性阻塞性肺疾病重叠综合征(ACOS)。2017全球哮喘防治创议(GINA)将其描述为哮喘一慢性阻塞性肺疾病重叠(ACO)。已有的研究发现,ACO比单独的哮喘和慢性阻塞性肺疾病急性加重更加频繁,生活质量更差,肺功能下降更快及病死率更高,消耗更多医疗资源,而目前对于ACO的认识还处于一个初级阶段,相关研究也逐渐受到广泛关注,文章对哮喘一慢性阻塞性肺疾病重叠近年的研究进展进行阐述。 | 檀春玲 王桦 ZHANG Guifen LI Chenfang LIU Guodong | 2018 | 疑难病杂志2018，17，6： | 13 |
| 4 | Roles of a sustained activation of NCED3 and the synergistic regulation of ABA biosynthesis and catabolism in ABA signal production in Arabidopsis显示文摘ABA, acting as a stress signal, plays crucial roles in plant resistance to water stress. Because ABA signal production is based on ABA biosynthesis, the regulation of NCED, a key enzyme in the ABA biosynthesis pathway, is normally thought of as the sole factor controlling ABA signal production. Here we demonstrate that ABA catabolism in combination with a synergistic regulation of ABA biosynthesis plays a crucial role in governing ABA signal production. Water stress induced a significant accumulation of ABA, which exhibited different patterns in detached and attached leaves. ABA catabolism followed a temporal trend of exponential decay for both basic and stress ABA, and there was little difference in the catabolic half-lives of basic ABA and stress ABA. Thus, the absolute rate of ABA catabolism, i.e. the amount of ABA catabolized per unit time, increases with increased ABA accumulation. From the dynamic processes of ABA biosynthesis and catabolism, it can be inferred that stress ABA accumulation may be governed by a synergistic regulation of all the steps in the ABA biosynthesis pathway. Moreover, to maintain an elevated level of stress ABA sustained activation of NCED3 should be required. This inference was supported by further findings that the genes encoding major enzymes in the ABA biosynthesis pathway, e.g. NCED3, AAO3 and ABA3 were all activated by water stress, and with ABA accumulation progressing, the expressions of NCED3, AAO3 and ABA3 remained activated. Data on ABA catabolism and gene expression jointly indicate that ABA signal production is controlled by a sustained activation of NCED3 and the synergistic regulation of ABA biosynthesis and catabolism. | REN HuiBo FAN YiJian GAO ZhiHui WEI KaiFa LI GuiFen LIU Jing CHEN Lin LI BingBing HU JianFang JIA WenSuo | 2007 | Chinese Science Bulletin2007，52，4： | 12 |
| 5 | Variability of phytoplankton absorption in the northern South China Sea:influence of the size structure and pigment composition of algal populations显示文摘Data from three cruises conducted in the Zhujiang River (ZR), coastal waters of Guangdong (CWGD) and the northern South China Sea (NSCS) during 2003 and 2004 were examined for assessing the relative importance of pigment composition and packaging effect in modifying the specific absorption coefficients of phytoplankton. The three survey regions differ widely in their phytoplankton community with large cells dominating the ZR and CWGD waters and small cells dominating the NSCS region. Variations in the size structure and the accessory pigments have much effect on the chlorophyll a-specific absorption coefficient of phytoplankton. The size index accounted for about 42% and 33% of the variation of the specific absorption coefficient at 440 and 675 nm, respectively. Using the multiple regression analysis approach, pigment concentrations for each sample were calculated. The accessory pigments other than chlorophyll a contribute to absorption mainly in the blue-to-green region of the spectrum and their absorptions account for about 44%, 43% and 53% on the average of the total phytoplankton absorption at 440 nm for the ZR, CWGD and NSCS regions. Among the accessory pigments, the photosynthetic carotenoids (noted PSC) play a dominant role in the ZR and CWGD waters, while in the NSCS the nonphotosynthetic carotenoids (noted PPC) as well as PSC have important contributions. Because the variations of both the size structure and accessory pigments in algal populations contributed to the variability of the specific absorption coefficient in the study regions, these factors may be considered explicitly in future bio-optical algorithms to derive chlorophyll a concentration more accurately. | WANG Guifen CAO Wenxi XU Dazhi YANG Yuezhong | 2007 | Acta Oceanologica Sinica2007，26，2： | 9 |
| 6 | Abnormality monitoring model of cracks in concrete dams显示文摘The abnormality monitoring model (AMM) of cracks in concrete dams is established through integrating safety monitoring theories with abnormality diagnosis methods of cracks. In addition, emphasis is placed on the influence of crack depth on crack mouth opening displacement (CMOD). A linear hypothesis is proposed for the propagation process of cracks in concrete based on the fictitious crack model (FCM). Abnormality points are detected through testing methods of dynamical structure mutation and statistical model mutation. The solution of AMM is transformed into a global optimization problem, which is solved by the particle swarm optimization (PSO) method. Therefore, the AMM of cracks in concrete dams is established and solved completely. In the end of the paper, the proposed model is validated by a typical crack at the 105 m elevation of a concrete gravity arch dam. | BAO TengFei QIN Dong ZHOU XiWu WU GuiFen | 2011 | Science China(Technological Sciences)2011，54，7： | 9 |
| 7 | Chemical characteristics and source apportionment of PM_(2.5) in a petrochemical city: Implications for primary and secondary carbonaceous component显示文摘To study the pollution features and underlying mechanism of PM_(2.5) in Luoyang, a typical developing urban site in the central plain of China, 303 PM_(2.5) samples were collected from April 16 to December 29, 2015 to analyze the elements, water soluble inorganic ions, organic carbon and elemental carbon. The annual mean concentration of PM_(2.5) was 142.3 μg/m^(3), and 75% of the daily PM_(2.5) concentrations exceeded the 75 μg/m^(3). The secondary inorganic ions, organic matter and mineral dust were the most abundant species, accounting for 39.6%, 19.2% and 9.3% of the total mass concentration, respectively. But the major chemical components showed clear seasonal dependence. SO_(4)^(2-) was most abundant specie in spring and summer, which related to intensive photochemical reaction under high O_3 concentration. In contrast, the secondary organic carbon and ammonium while primary organic carbon and ammonium significantly contributed to haze formation in autumn and winter, respectively. This indicated that the collaboration effect of secondary inorganic aerosols and carbonaceous matters result in heavy haze in autumn and winter. Six main sources were identified by positive matrix factorization model: industrial emission, combustion sources, traffic emission, mineral dust, oil combustion and secondary sulfate, with the annual contribution of 24%, 20%, 24%, 4%, 5% and 23%, respectively. The potential source contribution function analysis pointed that the contribution of the local and short-range regional transportation had significant impact. This result highlighted that local primary carbonaceous and precursor of secondary carbonaceous mitigation would be key to reduce PM_(2.5) and O_3 during heavy haze episodes in winter and autumn. | Guangxuan Yan Puzhen Zhang Jie Yang Jingwen Zhang Guifen Zhu Zhiguo Cao Jing Fan Zirui Liu Yuesi Wang | 2021 | Journal of Environmental Sciences2021，33，5： | 6 |
| 8 | Velocity compensation methods for LPRF modulated frequency stepped-frequency(MFSF) radar显示文摘In the high speed target environment,there exists serious Doppler effect in the low pulse repetition frequency(LPRF) modulated frequency stepped frequency(MFSF) radar signal.The velocity range of the target is large and the velocity is high ambiguous,so the single method is difficult to satisfy the velocity measurement requirement.For this problem,a novel method is presented,it is a combination of cross-correlation inner frame velocity measurement and range-Doppler coupling velocity measurement.The cross-correlation inner frame method,overcoming the low Doppler tolerance of the cross-correlation between frames,can obtain the coarse velocity of the high speed target,and then the precision velocity can be obtained with the range-Doppler coupling method.The simulation results confirm the method is effective,and also it is well real-time and easy to the project application. | Guifen Xia Hongyan Su Peikang Huang | 2010 | Journal of Systems Engineering and Electronics2010，21，5： | 5 |
| 9 | Bioinformatics analysis for structure and function of CPR of Plasmodium falciparum显示文摘Objective:To analyse the structure and function of NADPH-cytochrome p450 reductase(CYPOR or CPR) from Plasmodium falciparum(Pf),and to predict its’ drug target and vaccine target. Methods:The structure,function,drug target and vaccine target of CPR from Plasmodium falciparum were analyzed and predicted by bioinformatics methods.Results:PfCPR,which was older CPR,had close relationship with the CPR from other Plasmodium species,but it was distant from its hosts,such as Homo sapiens and Anopheles.PfCPR was located in the cellular nucleus of Plasmodium falciparum.335aa-352aa and 591aa - 608aa were inserted the interior side of the nuclear membrane,while 151aa-265aa was located in the nucleolus organizer regions.PfCPR had 40 function sites and 44 protein-protein binding sites in amino acid sequence.The teriary structure of laa-700aa was forcep-shaped with wings.15 segments of PfCPR had no homology with Homo sapien CPR and most were exposed on the surface of the protein.These segments had 25 protein-protein binding sites.While 13 other segments all possessed function sites. Conclusions:The evolution or genesis of Plasmodium falciparum is earlier than those of Homo sapiens.PfCPR is a possible resistance site of antimalarial drug and may involve immune evasion, which is associated with parasite of sporozoite in hepatocytes.PfCPR is unsuitable as vaccine target,but it has at least 13 ideal drug targets. | Zhigang Fan Lingmin Zhang Guogang Yan Qiang Wu Xiufeng Gan Saifeng Zhong Guifen Lin | 2011 | Asian Pacific Journal of Tropical Medicine2011，4，2： | 3 |
| 10 | The method and experiment analysis of two-way common-view satellite time transfer for compass system显示文摘Time synchronization between ground and satellites is a key technology for satellite navigation system. With dual-channel satellite, a method called Two-Way Common-View(TWCV) satellite time transfer for Compass system is proposed, which combines both characteristics of satellite common-view and two-way satellite-ground time transfer. By satellite-ground two-way pseudo-range differencing and two stations common-view differencing, this TWCV method can completely eliminate the influence of common errors, such as satellite clock offset, ephemeris errors, troposphere delay and station coordinates errors. At the same time, ionosphere delay related to signal frequency is also weakened significantly. So the precision of time transfer is improved much more greatly than before. In this paper, the basic principle is introduced in detail, the effect of major errors is analyzed and the practical calculation model in the Earth-fixed coordinate system for this new method is provided. Finally, experiment analysis is conducted with actual Compass observing data. The results show that the deviation and the stability of the satellite dual channel can be better than 0.1 ns, and the accuracy of the two-way common-view satellite time transfer can achieve 0.4 ns. All these results have verified the correctness of this TWCV method and model. In addition, we compare this TWCV satellite time transfer with the independent C-band TWSTFT(Two-Way Satellite Time and Frequency Transfer). It shows that the result of the TWCV satellite time transfer is in accordance with the C-band TWSTFT result, which further suggests that the TWCV method is a remote high precision time transfer technique. The research results in this paper are very important references for the development and application of Compass satellite navigation system. | LIU Li TANG GuiFen HAN ChunHao SHI Xin GUO Rui ZHU LingFeng | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，8： | 2 |
| 11 | A Slip-Line Method for Calculating Extrusion Force of Steel Helmet with Cold Extrusion Moulding显示文摘This paper presents the elastic and plastic deformation of the steel helmet with coldextrusion moulding. The plastic streamline of the plastic mould-making process for ellipse thinplate is described. The distribution of slip-line is established based on the plastic streamline. Theextrusion force of plastic moulding of the steel helmet is calculated by using of slip-line method.Furthermore, an applied example is given. | Guo Jinji Zhao Sheng Xing Haoxu(Department of Applied Mechanics and Engineering, Zhongshan University,Guangzhou 510275, P. R. China)Guan Guifen Liu Zhijian(The Iron Steel Research institute of Guangdong,Guangzhou 510275, P. R. China) | 1999 | Journal of Systems Engineering and Electronics1999，10，2： | 2 |
| 12 | Surfactant dependent evolution of Au-Pd alloy nanocrystals from trisoctahedron to excavated rhombic dodecahedron and multipod: a matter of crystal growth kinetics显示文摘In wet chemical syntheses of noble metal nanocrystals,surfactants play crucial roles in regulating their morphology.To date,more attention has been paid to the effect of the surfactant on the surface energy of crystal facets,while less attention has been paid to its effect on the growth kinetics.In this paper,using the growth of Au-Pd alloy nanocrystals as an example,we demonstrate that different concentration of surfactant hexadecyltrimethyl ammonium chloride(CTAC)may cause the different packing density of CTA+bilayers on different sites(face,edge or vertex)of crystallite surface,which would change the crystal growth kinetics and result in preferential crystal growth along the edge or vertex of crystallites.The unique shape evolution from trisoctahedron to excavated rhombic dodecahedron and multipod structure for Au-Pd alloy nanocrystals was successfully achieved by simply adjusting the concentration of CTAC.These results help to understand the effect of surfactants on the shape evolution of nanocrystals and open up avenues to the rational synthesis of nanocrystals with the thermodynamically unfavorable morphologies. | Qiaoli Chen Guifen Du Yongdi Dong Zhenming Cao Zhaoxiong Xie Lansun Zheng | 2017 | Science Bulletin2017，62，20： | 2 |
| 13 | Molecular cloning, tissue expression and protein structure prediction of the porcine 3-hydroxy-3-methylglutaryl-coenzyme A reductase ( HMGR ) gene显示文摘 | Xiao Chen Xiaofeng Wang Zongjin Li Lujun Kong Guifen Liu Jinluan Fu Aiguo Wang | 2011 | Gene2011，，2： | 2 |
| 14 | 为从变形体 berghei 的氮的氧化物 synthase 和类似的蛋白质的结构和功能的生物信息学分析和预言显示文摘 <正>Objective:To search and analyze nitric oxide synthase(NOS) and similar proteins from Plasmodium berghei(Pb).Methods:The structure and function of nitric oxide synthase and similar proteins from Plasmodium berghei were analyzed and predicted by bioinformatics. Results:P6NOS were not available,but nicotinamide adenine dinucleotide 2’-phosphate reduced tetrasodium(NADPH)-cytochrome p450 reductase(CPR) were gained.PiCPR was in the nucleus of Plasmodium berghei,while 134aa-229aa domain was localize in nucleolar organizer. The amino acids sequence of P6CPR had the closest genetic relationship with Plasmodium vivax showing a 73%homology.The tertiary structure of PbCPR displayed the forcep-shape with wings,but no wings existed in the tertiary structure of its’ host,Mus musculus(Mm).137aa-200aa, 201aa-218aa,220aa-230aa,232aa-248,269aa-323aa,478aa-501aa and 592aa-606aa domains of P6CPR showed no homology with MmCPRs’,and all domains were exposed on the surface of the protein.Conclusions:NOS can’t be found in Plasmodium berghei and other Plasmodium species.PbCPR may be a possible resistance site of antimalarial drug,and the targets of antimalarial drug and vaccine.It may be also one of the mechanisms of immune evasion.This study on Plasmodium berghei may be more suitable to Plasmodium vivax.And137aa-200aa, 201aa-218aa,220aa-230aa,232aa-248,269aa-323aa,478aa-501aa and 592aa-606aa domains of PbCPR are more ideal targets of antimalarial drug and vaccine. | Zhigang Fan Gang Lv Lingmin Zhang Xiufeng Gan Qiang Wu Saifeng Zhong Guogang Yan Guifen Lin | 2011 | Asian Pacific Journal of Tropical Medicine2011，4，1： | 2 |
| 15 | Relationship Between Soil Properties and Different Fractions of Soil Hg显示文摘Correlation and path analysis methods were used to study the relationship between soil properties and the distribution of different soil Hg fractions with nine representative soils from Chongqing, China. Results showed that clay (< 2 m) could increase water-soluble Hg (r = 0.700*). Soil organic matter (OM) could enhance the increase of elemental Hg (r = 0.674*). The higher the base saturation percentage (BSP), the more the residual Hg (T = 0.684*). Organic Hg, the sum of acid-soluble organic Hg and alkali-soluble Hg, was positively affected by silt (2-20 μm) but negatively affected by pH, with the direct path coefficients amounting to 1.0487 and 0.5121, respectively. The positive effect of OM and negative effect of BSP on organic Hg were the most significant, with the direct path coefficients being 0.7614 and -0.8527, respectively. The indirect effect of clay (< 2 μm) via BSP (path coefficient = 0.4186) was the highest, showing that the real influencing factor in the effect of clay (< 2 μm) on acid-soluble organic Hg was BSP. Since the available Hg fraction, water-soluble Hg, was positively affected by soil clay content, and the quite immobile and not bioavailable residual Hg by soil BSP, suitable reduction of clay content and increase of BSP would be of much help to reduce the Hg availability and Hg activity in Hg-contaminated soils. | WU HONGTAO YU GUIFEN QING CHANGLE and CHEN TONGBIN Southwest Agricultural University, Chongqing 400716 (China) Institute of Geographic Sciences and Natural Resources, the Chinese Academy of Sciences, Beijing 100101 (China) Institute of Soil Science, th | 2001 | Pedosphere2001，11，3： | 2 |
| 16 | Effects of Slow-release Fertilizers and Sugarcane-specific Fertilizers on Yield and Quality of Sugarcane显示文摘The effects of slow-release fertilizers and sugarcane-specific fertilizers on the growth and quality of sugarcane were studied to provide a theoretical basis for cultivation of sugarcane with lower costs but higher efficiency. Field experiments were carried out in two major sugarcane areas in Guangxi and three fertilization treatments were studied: single application of compound fertilizers( treatment I),compound fertilizers + slow-release fertilizers( treatment II) and sugarcane-specific base fertilizers + sugarcane-specific topdressing( treatment III). Effects of equal fertilization conditions of treatment I,II and III on growth,yield and sugar of sugarcane were studied. The three fertilization treatments had little effects on emergence,tillering,and effective stems of sugarcane,but compared with the treatment of compound fertilizer( treatment I) with a ratio of N,P,and K of 1∶1∶1,treatment II using slow-release fertilizers as topdressing had better growth,higher plant height and stem diameter,so the yield was higher. Treatment III designed sugarcane-specific fertilizers with proper ratio according to fertilizer demands of sugarcane. Besides,the treatment III sugarcane-specific base fertilizers,containing certain amount of organic matters,could promote the sugar accumulation of sugarcane. Therefore,the sugarcane yield of treatment III was higher than that of treatment II. In conclusion,slow-release fertilizers and sugarcane-specific fertilizers can significantly increase sugarcane yield,especially sugarcane-specific fertilizers. Sugarcane-specific fertilizers have reasonable ratio and contain certain amount of organic matters,and can increase sugar content,obtain significant economic benefits,so it is worth popularization in large areas. | Qing LIAO Zepu JIANG Ying XING Shao'e YANG Guifen CHEN Panxia LIANG | 2018 | Asian Agricultural Research2018，10，6： | 2 |
| 17 | On brain activity mapping: Insights and lessons from Brain Decoding Project to map memory patterns in the hippocampus显示文摘The BRAIN project recently announced by the president Obama is the reflection of unrelenting human quest for cracking the brain code, the patterns of neuronal activity that define who we are and what we are. While the Brain Activity Mapping proposal has rightly emphasized on the need to develop new technologies for measuring every spike from every neuron, it might be helpful to consider both the theoretical and experimental aspects that would accelerate our search for the organizing principles of the brain code. Here we share several insights and lessons from the similar proposal, namely, Brain Decoding Project that we initiated since 2007. We provide a specific example in our initial mapping of real-time memory traces from one part of the memory circuit, namely, the CA1 region of the mouse hippocampus. We show how innovative behavioral tasks and appropriate mathematical analyses of large datasets can play equally, if not more, important roles in uncovering the specific-to-general feature-coding cell assembly mechanism by which episodic memory, semantic knowledge, and imagination are generated and organized. Our own experiences suggest that the bottleneck of the Brain Project is not only at merely developing additional new technologies, but also the lack of efficient avenues to disseminate cutting edge platforms and decoding expertise to neuroscience community. Therefore, we propose that in order to harness unique insights and extensive knowledge from various investigators working in diverse neuroscience subfields, ranging from perception and emotion to memory and social behaviors, the BRAIN project should create a set of International and National Brain Decoding Centers at which cutting-edge recording technologies and expertise on analyzing large datasets analyses can be made readily available to the entire community of neuroscientists who can apply and schedule to perform cutting-edge research. | TSIEN Joe Z. LI Meng OSAN Remus CHEN GuiFen LIN LongNian WANG Phillip Lei FREY Sabine FREY Julietta ZHU DaJiang LIU TianMing ZHAO Fang KUANG Hui | 2013 | Science China(Life Sciences)2013，56，9： | 1 |
| 18 | Dehydrogenation and aromatization of methane under non-oxidizing conditions显示文摘 | Linsheng Wang Longxiang Tao Maosong Xie Guifen Xu Jiasheng Huang Yide Xu | 1993 | Catalysis Letters (-)1993，，1： | 1 |
| 19 | The DNA fingerprint generated by four fingerprint of poultry显示文摘 | Meng Anming QI Shunzhang GONG Guifen | 1993 | Progress in Biochemistry and Biophysics1993，20，2： | 1 |
| 20 | Performance of carbon aero- gels particle electrodes for the aqueous phase electro-catalytic oxi- dation of simulated phenol wastewaters 显示文摘 | Lv Guifen Wu Dingcai Fu Ruowen | 2009 | Journal of Hazardous Materials2009，165，13： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员