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Search Results: 1 - 10 of 90965 matches for " JIANG XING YU "
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The ecological adaptability of Aphis gossypii collected from different climate zones to temperature and photoperiod
不同地理种群棉蚜对温度和光周期的生态适应性

JIANG Xing-Yu,
刘健

生态学报 , 2003,
Abstract: Cotton aphid Aphis gossypii (Homoptera: Aphididae), an important agricultural pest, its distribution extends from 60°N to 40°S in the world. This insect is capable to survive under different climatic conditions due to its wider adaptability. In summer, this insect reproduces parthenogenetically from generation to generation, after the late autumn it produces sexual aphids to lay eggs to over-winter. This paper presents studies on ecological adaptability of Aphis gossypii under different temperature and phot...
COMPARISON OF VOLATILE COMPONENTS FROM MARCHANTIA CONVOLUTA OBTAINED BY MICROWAVE EXTRACTION AND PHYTOSOL EXTRACTION
YAN,CHEN; XING YU,JIANG; XING,TONG; XIAO QING,CHEN;
Journal of the Chilean Chemical Society , 2008, DOI: 10.4067/S0717-97072008000200016
Abstract: the volatile oils from marchantía convoluta were obtained by microwave extraction (me) and phytosol extraction (pe) methods. the attained extracts were analyzed by gas chromatography with mass spectrometric detector (gc-ms). the compounds were identified according to their retention indices and mass spectra (el, 70 ev). a total of fourteen compounds were identified in me extract accounting for 80.72% of total peak area. isolongifolene (24.588%), 1, 2-benzenedicarboxylic acid, butyl cyclohexyl ester (10.768%), pyrene (9.328%) and hexadecanoic acid, ethyl ester (8.570%) were the major compounds identified from me extract. the analytical results of me extract were compared with pe method. the me extract was found to be markedly different from that of pe extract. a total of seven compounds in pe extract were identified accounting for 74.275% total peak area. 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10, 10a-octahydro-1, 4a-dimethyl-7-(1-methylethyl) methyl ester were the major compounds
COMPARISON OF VOLATILE COMPONENTS FROM MARCHANTIA CONVOLUTA OBTAINED BY MICROWAVE EXTRACTION AND PHYTOSOL EXTRACTION
CHEN YAN,JIANG XING YU,TONG XING,CHEN XIAO QING
Journal of the Chilean Chemical Society , 2008,
Abstract: The volatile oils from Marchantía convoluta were obtained by microwave extraction (ME) and phytosol extraction (PE) methods. The attained extracts were analyzed by gas chromatography with mass spectrometric detector (GC-MS). The compounds were identified according to their retention indices and mass spectra (El, 70 eV). A total of fourteen compounds were identified in ME extract accounting for 80.72% of total peak area. Isolongifolene (24.588%), 1, 2-benzenedicarboxylic acid, butyl cyclohexyl ester (10.768%), pyrene (9.328%) and hexadecanoic acid, ethyl ester (8.570%) were the major compounds identified from ME extract. The analytical results of ME extract were compared with PE method. The ME extract was found to be markedly different from that of PE extract. A total of seven compounds in PE extract were identified accounting for 74.275% total peak area. 1-Phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10, 10a-octahydro-1, 4a-dimethyl-7-(1-methylethyl) methyl ester were the major compounds
The Literature Review of Raised Funds to Buy Financial Products  [PDF]
Xing Jiang
Journal of Financial Risk Management (JFRM) , 2018, DOI: 10.4236/jfrm.2018.71004
Abstract: Since 2015, the speed of A-share IPO review has been accelerating. The raised funds by listed companies hit record highs in many different ways. After the stock investment, investors have also begun to pay more attention to the whereabouts of the raised funds. Because of the phenomenon of frequent purchases of financial products by raised funds in the past three years, the academic community set off a wave of scholarship fund-raising academic research after 2000. This article discussed the existing literature theory on listed companies using raised funds to purchase trust financing. And this article not only gave a summary to the research methods and conclusions of the raised funds buying trust financing or financing products, but also reviewed the research about investment efficiency after the raised funds target project changed. At last, this paper gave several directions for the future study about raised funds.
Study on the mechanism of cadmium resistance in Phragmites australis
芦苇抗镉污染机理研究

JIANG Xing-Yu,
江行玉

生态学报 , 2003,
Abstract: The influence of Cadmium (Cd) on physiolgical and biochemical growth parameters was studied to elucidate the mechanism of cadmium resistance in Phragmites australis. Cd levels in roots, rhizomes, stems and leaves increased with Cd pollution. The levels in roots were the highest, while that in leaves were the lowest. Using X-ray microanalysis revealed that Cd accumulated markedly in cell wall, cytoplasm, vacuole and intercellular space. A gradient of Cd levels occurred in different parts of root cortex cell with the sequence: intercellular > cell wall > vacuole > cytoplasm. Sequential extraction revealed that the ratio of Cd extracted from different extraction media was markedly different, of which NaCl extractable-Cd was dominant in both roots and leaves of P. australis. Cd-binding proteins were found in both; root and leaf after gel filtration chromatograph. The Cd-binding protein in root might be a polymer of phytochelatins. In addition, a new polypeptides was found under Cd pollution, and at the same time the other protein disappeared. And the experiments of BSO also proved the detoxification of Cd by phytochelatins. All the above results suggested that detoxification of Cd in P. australis may involve different strategies: retention in root, accumulation in intercellular, deposition on cell wall, compartmentalization in vacuole, insoluble Cd-binding components and Cd-binding protein.
A Three-Dimensional Model of Transport and Diffusion of Seeding Agents within Stratus
Yu Xing,Dai Jin,Jiang Weimei,Fan Peng,
Yu Xing
,Dai Jin,Jiang Weimei,Fan Peng

大气科学进展 , 2000,
Abstract: It is essential to learn the temporal and spatial concentration distributions and variations of seeding agents in cloud seeding of precipitation enhancement. A three-dimensional puff trajectory model incorpo-rating a mesoscale nonhydrostatic model has been formulated, and is applied to simulating the transporting and diffusive characteristics of multiple line sources of seeding agents within super-cooled stratus. Several important factors are taken into consideration that affect the diffusion of seeding materials such as effects of topography and vertical wind shear, temporal and spatial variation of seeding parameters and wet deposi-tion. The particles of seeding agents are assumed to be almost inert, they have no interaction with the particles of the cloud or precipitation except that they are washed out by precipitation. The model validity is demonstrated by the analyses and comparisons of model results, and checked by the sensitivity experiments of diffusive coefficients and atmospheric stratification. The advantage of this model includes not only its exact reflection of heterogeneity and unsteadiness of background fields, but also its good simulation of trans port and diffusion of multiple line sources.The horizontal diffusion rate and the horizontal transport distance have been proposed that they usual-ly were difficult to obtain in other models. In this simulation the horizontal diffusion rate is 0.82 m s-1 for average of one hour, and the horizontal average transport distance reaches 65 km after 1 h, which are closely related to the background fields.
Formation of Fiber―bundle/Matrix Interlayer in Carbon/Carbon Composites
JING Jie-Hui, HUANG Yu-Dong, LIU Li, JIANG Zai-Xing, JIANG Bo
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.01309
Abstract: The interfacial performances of carbon/carbon composites in different process stages were characterized by push―out method to find the formation law of fiber―bundle/matrix interlayer in the process of carbon/carbon composites preparation. Microstructures in fiber―bundle/matrix interlayer of carbon/carbon composites obtained from different process stages were investigated through SEM, Micro―CT, XRD and Raman spectrum. Experiment results of interfacial shear strength of specimens obtained from different process stages show that, the interfacial shear strength of specimen with lower density was not clearly increased with the degree of graphitization increasing; however, the interfacial shear strength was clearly increased with the density of specimens increasing. The observation of the interfacial microstructures of the composite showed that matrix was firstly formed in intrabundles, then formed in bundle surface and interbundles. The degrees of graphitization and crystallization at surface were gradually increased with heat―treatment temperature increasing. The experiment results show that interfacial structures and performances in fiber―bundle/matrix interlayer of carbon/carbon composites gradually develop to be perfect with repeated cycles of in―ltration―carbonization―graphitization process.
Poly[[(μ3-5,6-dicarboxybicyclo[2.2.2]oct-7-ene-2,3-dicarboxylato)(1,10-phenanthroline)copper(II)] monohydrate]
Yun-Yu Liu,Yu-Jiang Zhuo,Xing-Qi Li,Ji-Cheng Ma
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808037999
Abstract: In the title compound, {[Cu(C12H10O8)(C12H8N2)]·H2O}n, the CuII ion is five-coordinated by two N atoms from one phenanthroline ligand and three O atoms from three different H2L2 anions (H4L is bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic acid) in a distorted square-pyramidal geometry. Each H2L2 ion bridges three CuII atoms to form a zigzag sheet parallel to the ab plane. The crystal structure is consolidated by O—H...O hydrogen bonds.
Comparison of the Water Quality between the Surface Microlayer and Subsurface Water in Typical Water Bodies in Sichuan  [PDF]
Jiang Yu
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.210101
Abstract: Investigation and assessment of water quality status in the surface microlayer (SML) and subsurface water (SSW) in several kinds of typical water bodies in Sichuan were carried out from May to June 2010.The results showed that N, P were enriched to some extent at SML in Xichi pool, Funan River and Longquan reservoir, which made concentrations of the indexes such as total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD)of SML be much higher than those of SSW (P<0.05), and the exceeding rates were up to 100%. The contents of TN,TP,COD of SML and SSW in Xichi pool, and Funan River exceeded III even Ⅳlevel of water quality standard, while these indexes in Longquan reservoir were lower than Ⅲ or Ⅱlevel of water quality standard. Though Chl. a mass concentration at SML and SSW in Funan River was prominently lower than those in Xichi pool and Longquan reservoir, according to the eutrophic evaluation standard, the water bodies of SML and SSW in Funan River and Xichi pool were in middle eutrophication, the highest index of eutrophication (E value) was up to 66.78, while there was light entuophic in Longquan reservoir, and there had obvious difference with E value and COD, TP, TN (P<0.05). This research shows that the water quality of Longquan reservoir is generally well. While Funan River is a middle eutrophication, and its pollution is more serious than Xichi pool, the two waters belong to national III even IV level, and SML has the capability of enrichment to the pollutants such as N, P.
Techniques for Determining the Geographic Location of IP Addresses in ISP Topology Measurement
Yu Jiang,Bin-Xing Fang,Ming-Zeng Hu,Xiang Cui,
Yu Jiang
,Bin-Xing Fang,Ming-ZengHu,and Xiang Cui

计算机科学技术学报 , 2005,
Abstract: A brief survey on the state-of-the-art research of determining geographic location of IP addresses is presented. The problem of determining the geographic location of routers in Internet Service Provider (ISP) topology measurement is discussed when there is inadequate information such as domain names that could be used. Nine empirical inference rules are provided, and they are respectively (1) rule of mutual inference, (2) rule of locality, (3) rule of ping-pong assignment, (4) rule of bounding from both sides, (5) rule of preferential exit deny, (6) rule of unreachable/timeout, (7) rule of relay hop assignment, (8) rule of following majority, and (9) rule of validity checking based on interface-finding. In totally 2,563 discovered router interfaces of a national ISP topology, only 6.4% of them can be located by their corresponding domain names. In contrast, after exercising these nine empirical inference rules, 38% of them have been located. Two methods have mainly been employed to evaluate the effectiveness of these inference rules. One is to compare the measured topology graph with the graph published by the corresponding ISP. The other is to contact the administrator of the corresponding ISP for the verification of IP address locations of some key routers. The conformity between the locations inferred by the rules and those determined by domain names as well as those determined by whois information is also examined. Experimental results show that these empirical inference rules play an important role in determining the geographic location of routers in ISP topology measurement. Supported by the National Natural Science Foundation of China under Grant Nos. 60203021 and 60403033. Yu Jiang received the B.S. degree in computer software from the Heilongjiang University, Harbin, China, in 1990 and the M.S. degree in computer software and theory from the Harbin Institute of Technology (HIT), Harbin, China, in 1999. From August 1990 to August 1999, he worked on computer applications for the Statistics Bureau of Heilongjiang Provincial Government. At present, he is with the professional title of senior electronic engineer, and he is currently working toward the Ph.D. degree at the HIT. His current research interests are in the areas of Internet measurement and distributed network computing. Bin-Xing Fang received the B.S. degree in computer applications from the HIT, Harbin, China, in 1981 and the M.S. degree in computer architecture from Tsinghua University, Beijing, China, in 1984 and the Ph.D. degree in computer architecture from the HIT, Harbin, China, in 1989. He conducted post-doctoral research work at the National University of Defense Technology, Changsha, China. He is a part time professor in the School of Computer Science and Technology at the HIT, Harbin, China, and the head of the National Computer Network Emergency Response Technical Team/Coordination Center, Beijing, China. His research interests are in the areas of computer network and
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