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Search Results: 1 - 10 of 9095 matches for " Zhiyuan Tan "
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The Solution of a Class of Third-Order Boundary Value Problems by the Reproducing Kernel Method
Zhiyuan Li,Yulan Wang,Fugui Tan
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/195310
Abstract: This paper expands the application of reproducing kernel method to a class of third-orderboundary value problems with mixed nonlinear boundary conditions. The analytical solution is represented in the form of series in the reproducing kernel space. The -term approximation is obtained andis proved to converge to the analytical solution. The numerical examples are given to demonstrate thecomputation efficiency of the presented method. Results obtained by the method indicate that the method issimple and effective.
The Solution of a Class of Singularly Perturbed Two-Point Boundary Value Problems by the Iterative Reproducing Kernel Method
Zhiyuan Li,YuLan Wang,Fugui Tan,Xiaohui Wan,Tingfang Nie
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/984057
Abstract: In (Wang et al., 2011), we give an iterative reproducing kernel method (IRKM). The main contribution of this paper is to use an IRKM (Wang et al., 2011), in singular perturbation problems with boundary layers. Two numerical examples are studied to demonstrate the accuracy of the present method. Results obtained by the method indicate that the method is simple and effective.
Diversity and high nitrogenase activity of endophytic diazotrophs isolated from Oryza rufipogon Griff.
ZhiYuan Tan,GuiXiang Peng,PeiZhi Xu,ShaoYing Ai,ShuanHu Tang,GuoXia Zhang,FengYun Zeng
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0408-8
Abstract: Diversity and nitrogenase activity of endophytic diazotrophs colonized in the wild rice Oryza rufipogon Griff grown in Boluo, Huilai County in Guangdong Province and Lingshui County in Hainan Province were studied. Thirty-seven isolates obtained from Oryza rufipogon were identified as putative endophytic nitrogen-fixing bacteria by ARA (acetylene reduction assay) test and further confirmed by PCR amplification of nifH gene fragments. All obtained strains have ARA activity and the same sized nifH gene fragments. Above the similarity level of 80%, the obtained isolates were assigned as Group I to VIII by the clustering of IS-PCR fingerprints. The SDS-PAGE whole-cell protein patterns were similar to those of IS-PCR fingerprints. Components and contents of fatty acid methyl esters (FAMEs) were used to differentiate the representative strains (Ls13, Ls8, BL1, BL12, HL6, Ls4) from Group I to Group VI. The six representative strains showed significant difference in contents and components of cellular fatty acid methyl ester. 16S rDNA sequencing analysis showed that strains of Group I to VII were located in Enterobacteraceae (γ-proteobacteria). Strains of Group I and Group II were closely related to Klebsiella sp.; Strain Ls8 of Group II was a little far away from the genus of Pantoea (homology level 96% with Pantoea agglomerans), which may represent a new species or genus in Enterobacteraceae; Strains of Groups IV and V belonged to different Enterobacter sp.; Strain Ls4 and Ls 9 representing Group VI were close to Citrobacter amalonaticus with 98% sequence similarity; Strain Ls15 of Group VII showed 98% sequence identity with Pantoea sp.; Strains of Group VIII were assigned to the genus Ideonella (β-proteobacteria). Based on the above results, endophytic diazotrophs isolated from O. rufipogon showed great diversity and some diazotrophs showed high nitrogenase activity with 42.52 μmol/mL·h C2H4. Inoculation to rice tests indicated that the isolated endophytic diazotrophs significantly promoted the rice growth.
A Multipath Routing Algorithm Based on Traffic Prediction in Wireless Mesh Networks  [PDF]
Zhiyuan LI, Ruchuan WANG
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12013
Abstract: The technology of QoS routing has become a great challenge in Wireless Mesh Networks (WMNs). There exist a lot of literatures on QoS routing in WMNs, but the current algorithms have some deficiencies, such as high complexity, poor scalability and flexibility. To solve the problems above, a multipath routing algorithm based on traffic prediction (MRATP) is proposed in WMNs. MRATP consists of three modules including an algo-rithm on multipath routing built, a congestion discovery mechanism based on wavelet-neural network and a load balancing algorithm via multipath. Simulation results show that MRATP has some characteristics, such as better scalability, flexibility and robustness. Compared with the current algorithms, MRATP has higher success ratio, lower end to end delay and overhead. So MRATP can guarantee the end to end QoS of WMNs.
Application of Integrated Reorganization of Science Specimen Data Using Kettle  [PDF]
Zhiyuan Wu, Yang Mei
Intelligent Information Management (IIM) , 2019, DOI: 10.4236/iim.2019.111002
Abstract: Standards and specifications are the premise of integrated reorganization of science specimen data, and data integration is the core of the reorganization. ETL [1] which is the abbreviation of extract, transform, and load [2], is very suitable for data integration. Kettle is a kind of ETL software. In this paper, it has been introduced into the integrated reorganization of science specimen data. Multi-source and heterogeneous specimen data are integrated using kettle, and good results have been achieved. It proved the effectiveness of kettle in the integrated reorganization of science specimen data. The application has practical significance, and the method can be referenced when reorganizing other resource data.
Ultrafine particle emission characteristics of diesel engine by on-board and test bench measurement
Cheng Huang,Diming Lou,Zhiyuan Hu,Piqiang Tan,Di Yao,Wei Hu,Peng Li,Jin Ren,Changhong Chen,
Cheng Huang
,Diming Lou,Zhiyuan Hu,Piqiang Tan,Di Yao,Wei Hu,Peng Li,Jin Ren,Changhong Chen

环境科学学报(英文版) , 2012,
Abstract: This study investigated the emission characteristics of ultrafine particles based on test bench and on-board measurements. The bench test results showed the ultrafine particle number concentration of the diesel engine to be in the range of (0.56-8.35) × 108 cm-3. The on-board measurement results illustrated that the ultrafine particles were strongly correlated with changes in real-world driving cycles. The particle number concentration was down to 2.0 × 106 cm-3 and 2.7 × 107 cm-3 under decelerating and idling operations and as high as 5.0 × 108 cm-3 under accelerating operation. It was also indicated that the particle number measured by the two methods increased with the growth of engine load at each engine speed in both cases. The particle number presented a "U" shaped distribution with changing speed at high engine load conditions, which implies that the particle number will reach its lowest level at medium engine speeds. The particle sizes of both measurements showed single mode distributions. The peak of particle size was located at about 50-80 nm in the accumulation mode particle range. Nucleation mode particles will significantly increase at low engine load operations like idling and decelerating caused by the high concentration of unburned organic compounds.
NUMERICAL TAXONOMY AND DNA-DNA HYBRIDIZATION OF RHIZOBIAL STRAINS ISOLATED FROM THE LOESS PLATEAU OF CHINA
黄土高原根瘤菌数值分类及DNA-DNA杂交

Tan Zhiyuan Zhu Minge Cheng Lijuan,
谭志远
,朱铭莪,程丽娟,汪恩涛,李颖

微生物学报 , 1995,
Abstract: Thirty-five new rhizobial isolates from the loess plateau of China and 32known strains representing all known species of Rhizobium and Bradyrhizobium werecharacterized by numerical taxonomy and DNA analysis. New strains were mainlyisolated from the nodules of genera Amorpha, Camilla, Amblytropis, Caragana,Amphicarpaea, Glycyrrhiza, and Sophora. The results of numerical taxonomy based on208 phenotypical features showed that all tested strains were divided into 3 groups above72% similarity level. They were fast growing rhizobia, slow-growing rhizobia and amoderate-slow-growing group (generation time was above 5 hr). Most of new isolatesfell in 5 distinctive subgroups, differing from all known species of root nodule bacteria.Three of the 5 new subgroups belonged to Rhizobium, One of them belonged toBradyrhizobium. Another moderate-slow-growers were similar with a proposed newspecies, R. tianshanense. The analysis of DNA-DNA hybridization indicated that one(subgroup 7) of the 3 fast growing subgroups belonged to Rhizobium loti, and the otherswere new DNA homologous groups, differing from all known species. The exacttaxonomic positions of these new subgroups will be determined by further studies.
Isolation and identification of myxobacteria in the saline-alkaline soils of Akesu in Xinjiang
新疆阿克苏地区盐碱地粘细菌分离鉴定

Zhang Xianjiao,Li Zhikun,Tan Zhiyuan,Guo Jun,Zhu Honghui,
Zhang X
,Li Z,Tan Z,Guo J,Zhu H

微生物学报 , 2012,
Abstract: Objective]To isolate myxobacteria and investigate their diversity in saline-alkaline soils from Akesu in Xinjiang.Methods]Conventional culture-dependent methods,e.g.baiting technique,water agar,soil extract agar and mineral agar,were used to isolate myxobacteria from 25 soil samples collected from Akesu areas of Xinjiang.Combining with physicochemical properties(acidity/alkalinity,salt concentration,vegetation and geographical locations) of the soil samples,myxobacterial diversity was studied.Results]In total 58 strains were isolated,and identified as belonging to 6 different genera,i.e.Myxococcus,Cystobacter,Corallococcus,Sorangium,Nannocystis and Polyangium of Myxococcales.The most frequent genus isolated was Myxococcus which may better adapt in harsh environments.Different myxobacterial diversity was detected in different habitat.Conclusion]Myxobacteria diversity was low in saline-alkaline soils of Akesu in Xinjiang.
Cancer biomarkers and targeted therapies
Zhiyuan Shen
Cell & Bioscience , 2013, DOI: 10.1186/2045-3701-3-6
Abstract:
Bis(2-methylimidazolium) fumarate dihydrate
Zhiyuan Xie
Acta Crystallographica Section E , 2009, DOI: 10.1107/s160053680903952x
Abstract: In the title compound, 2C4H7N2+·C4H2O42 ·2H2O, the asymmetric unit consists of one 2-methylimidazolium cation, half a fumarate dianion and one water molecule. There is an inversion center at the mid-point of the central C—C bond of the fumarate anion. In the crystal structure, molecules are linked into a three-dimensional network by intermolecular N—H...O, O—H...O and weak C—H...O hydrogen bonds. In addition, there are weak π–π stacking interactions with centroid–centroid distances of 3.640 (1) .
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