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Optimizing checkpoint for scientific simulations

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第12期13卷 891-900页

作者： Xi-sheng XIAO Ying-ping HUANG Xi-hui ZHANG Economics & management College Southwest Jiaotong University Chengdu 610031 China Industrial and Commercial College Guizhou University of Finance and Economics Guiyang 550003 China College of Business University of North Alabama Florence AL 35632 USA

It is extremely time-consuming to restart a long-running simulation from the beginning when a failure *** is a viable solution that enables simulations to be resumed from the point of *** study three models to determine the optimal checkpoint interval between contiguous checkpoints so that the total execution time is minimized and we demonstrate that optimal checkpointing can facilitate *** study greatly advances our knowledge of and practice in optimizing long-running scientific simulations.

关键词： Checkpoint Long-running Optimizing Simulation

Effects of Aphidius gifuensis on the feeding behavior and potato virus Y transmission ability of Myzus persicae

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Insect Science 2018年第6期25卷 1025-1034页

作者： Ying-Qin He Yong-Qiang Zhang Juan-Ni Chen Wen-Long Chen Xian-Yi Zeng Hai-Tao Chen Wei Ding College of Plant Protection Southwest UniversityChongqingChina Guizhou Key Laboratory of Plant Disease and Pest management for Mountain Agriculture Institute of EntomologyGuizhou UniversityGuiyangChina Chongqing Institute of Tobacco Science ChongqingChina

The stylet penetration behavior of aphids when feeding on plants is associated with virus acquisition and *** gifuensis (Ashmead)is a primary endoparasitoid of Myzuspersicae (Sulzer)which is the most efficient vector of plant viruses. Information about the effects ofparasitoid on aphid and virus transmission can provide an essential foundation for designing effective biological control *** study aimed to investigate the effects *** on the feeding behavior and potato virus Y (PVY) transmission ability of *** results showed that after *** was para-sitized by ***,the duration of the first probe significantly ***, *** exerted remarkable effects on aphid feeding in phloem *** contribution of the E1 waveform to the phloem phase was significantly higher in all parasitized aphids than in the control *** the time of infestation increased for parasitized aphids,the total duration of phloem sap ingestion ***,the percentage of time *** spent in the xylem and phloem phases only changed significantly on day *** percent transmission of PVY by the aphids parasitized on day 5 was lower than that in the control,but no significant differences were *** significance of this work is the demonstration that *** can impede the feeding behavior of ***,which sheds light on the biological basis *** as a natural enemy, but unfortunately does not provide an immediate solution for disrupting the transmission of PVY.

关键词： Braconidae electrical penetration graphs feedingbehavior Myzuspersicae parasitoids virus transmission

Molecular Screening of Blast Resistance Genes in Rice Germplasms Resistant to Magnaporthe oryzae

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Rice science 2017年第1期24卷 41-47页

作者： LIANG Yan YAN Bai-yuan PENG Yun-liang JI Zhi-juan ZENG Yu-xiang WU Han-lin YANG Chang-deng State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China The Seed management Station of Jiande Jiande 311600China Institute of Plant Protection Sichuan Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crops in Southwest ChinaMinistry of AgricultureChengdu 610066China

Molecular screening of major rice blast resistance genes was determined with molecular markers, which showed close-set linkage to 11 major rice blast resistance genes（Pi-d2, Pi-z, Piz-t, Pi-9, Pi-36, Pi-37, Pi5, Pi-b, Pik-p, Pik-h and Pi-ta2）, in a collection of 32 accessions resistant to Magnaporthe oryzae. Out of the 32 accessions, the Pi-d2 and Pi-z appeared to be omnipresent and gave positive express. As the second dominant, Pi-b and Piz-t gene frequencies were 96.9% and 87.5%. And Pik-h and Pik-p gene frequencies were 43.8% and 28.1%, respectively. The molecular marker linkage to Pi-ta2 produced positive bands in eleven accessions, while the molecular marker linkage to Pi-36 and Pi-37 in only three and four accessions, respectively. The natural field evaluation analysis showed that 30 of the 32 accessions were resistant, one was moderately resistant and one was susceptible. Infection types were negatively correlated with the genotype scores of Pi-9, Pi5, Pi-b, Pi-ta2 and Pik-p, although the correlation coefficients were very little. These results are useful in identification and incorporation of functional resistance genes from these germplasms into elite cultivars through marker-assisted selection for improved blast resistance in China and worldwide.

关键词： Screening linkage blast elite eleven genotype susceptible breeding moderately chromosome

Diester Derivatives from Chemically Modified Waste Cooking Oil as Substitute for Petroleum Based Lubricating Oils

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China Petroleum Processing & Petrochemical Technology 2015年第2期17卷 76-83页

作者： Xiang Shuo Chen Ligong Xu Lan Li Liang Yang Xin Zhu Liye Department of Military Oil Application & management Engineering Logistical Engineering University of PLA School of Chemistry and Chemical Engineering Southwest University Oil Technical Supervision Office Logistical Department of Chengdu Military Area

In order to provide a new way for waste cooking oil(WCO) resource utilization, several diester derivatives were obtained from WCO through a three-step chemical modifications, viz.: transesterification, epoxidation and oxirane ring opening with carboxylic acids. The effects of the chain length of side chain groups on the viscosity, acid value, low temperature fluidity, thermo-oxidative stability, tribological properties and surface tension of diester derivatives were investigated. The results showed that increasing the chain length of side chain groups had a positive influence on the viscosity, viscosity index, acid value, pour point, friction coefficient and wear scar diameter along with a negative influence on the oxidation onset temperature, volatile loss, insoluble deposit, maximum non-seizure load and surface tension. These diester derivatives exhibited improved physicochemical and tribological properties that make themselves promising environmentally friendly biolubricant basestocks.

关键词： waste cooking oil diester derivative lubricating oil physicochemical property tribological property

Establishment of Entrepreneurship Education and Practice System in Agricultural and Forestry Universities against the Background of New Countryside Construction

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Journal of Landscape Research 2013年第Z2期5卷 21-23,26页

作者： LIU Zimin College of Economics and management Southwest University Agricultural Education Development Research Center Southwest University

Current entrepreneurship education and practices in colleges and universities of China against the background of new countryside construction were analyzed,and compared with foreign *** analysis was adopted to further elaborate current entrepreneurship education and practices in agricultural and forestry colleges and universities of *** by education courses and practices,a sound course and practice system was established by considering characteristics and specialties of agricultural and forestry colleges and universities,which was significant for undergraduates from agricultural and forestry colleges and universities who want to start their own business,and also for the construction of new socialist countryside.

关键词： Agricultural and forestry colleges and universities Entrepreneurship education Course and practice system

Evaluation Model for Scientific Quality Based on Rough Sets and Its Empirical Study

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Journal of southwest Jiaotong University(English Edition) 2007年第3期15卷 247-251页

作者：刘盾胡培蒋朝哲刘丽 School of Economics and management Southwest Jiaotong University School of Adult Education Southwest Jiaotong University

By analyzing the questionnaires recollected from 74 different government departments in Chengdu, China, an evaluation model for scientific quality of civil servants was developed with the rough set theory. In the empirical study, a series of important rules were given to help to check and forecast the degree of the scientific quality of civil servants by using the reduction algorithm, and the total accuracy of prediction was 93.2%.

关键词： Rough set Rule reduction Scientific quality

Expressing p20 hairpin RNA of Citrus tristeza virus confers Citrus aurantium with tolerance/resistance against stem pitting and seedling yellow CTV strains

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Journal of Integrative Agriculture 2015年第9期14卷 1767-1777页

作者： CHENG Chun-zhen YANG Jia-wei YAN Hu-bin BEI Xue-jun ZHANG Yong-yan LU Zhi-ming ZHONG Guang-yan College of Horticulture and Landscape Architecture Southwest University Institute of Fruit Tree Research Guangdong Academy of Agricultural Sciences Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization Ministry of Agriculture Economic Crops Station Agricultural Bureau of Rongxian Institute of Crop Science Shanxi Academy of Agricultural Sciences

The Citrus tristeza virus (CTV) uses 3 silencing suppressor genes, p20, p23 and p25, to resist the attacks from its Citrus hosts. Inactivating these genes is therefore obviously a potential defensive option in addition to the current control strat-egies including aphid management and the use of mild strain cross protection. In this study, we cloned partial DNA frag-ments from the three genes, and used them to construct vectors for expressing hairpin RNAs (hpRNAs). To facilitate the formation of hpRNAs, the constructs were introduced in a loop structure. Fol owing transformation of sour orange (Citrus aurantium) with these constructs, 8 p20 hpRNA (hp20) and 1 p25 hpRNA (hp25) expressing lines were obtained. The 7 hp20 transgenic lines were further characterized. Their reactions to CTV were tested fol owing inoculation with CT14A and/or TR-L514, both of which are severe strains. Results showed that 3 lines (hp20-5, hp20-6 and hp20-8) were completely resistant to TR-L514 under greenhouse conditions for no detectable viral load was found in their leaves by PCR. However, they exhibited only partial suppression of TR-L514 under screen house conditions since the virus was detected in their leaves, though 2 months later compared to non-transgenic controls. Further tests showed that hp20-5 was tolerant also to CT14A under screen house conditions. The growth of hp20-5 was much better than others including the controls that were concurrently chal enged with CT14A. These results showed that expressing p20 hpRNA was sufifcient to confer sour orange with CTV resistance/tolerance.

关键词： Citrus tristeza virus(CTV) RNA interference transgenic plant Citrus aurantium disease resistance

Logical Framework,Path Selection and Mechanism Design for Cultivation of New Type Professional Farmers

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Asian Agricultural Research 2013年第10期5卷 125-129,132页

作者： Guangying LIU Jianfeng ZHANG Yingliang ZHANG Qinghua HUANG College of Economics and management Southwest University Business and Trade Department of Rongchang Campus Southwest University

New type professional farmers are farmers who possess certain resources and capitals,have certain extent of spirit of entrepreneurship,and are fully capable of obtaining and allocating resources related to agricultural production and management,and engaged in agricultural production and management for obtaining average *** of new type professional farmers should be promoted in the process and at the background of"coordinated development of industrialization,informationization,urbanization and agricultural modernization".It should establish a proper cultivation subject system consisting of government,enterprises,rural communities and nonprofit *** on multiple motive forces,efforts should be concentrated on cultivating those farmers with enterprising,highly innovative and learning ability,to guide traditional farmers to change into learning,enterprising and innovative *** addition,cultivation of new type professional farmers must rely on farmer education and training,modern agricultural development,increase in agricultural comparative advantage,innovation of rural management system and mechanism,multiple types of agricultural operation on a fairly large scale,as well as construction and regulation of new rural ***,it is recommended to provide system guarantee from long-term input mechanism of new type professional farmer education and training,incentive and restrictive mechanism of new type professional farmer cultivation,and construction of favorable environment for agricultural entrepreneurship.

关键词： New type professional farmers Logical framework Pa

Application of Reproducing Kernel Particle Method in an Analysis of Elasto-plastic Deformation Under Taylor Impact

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Journal of China University of Mining and Technology 2006年第4期16卷 485-489页

作者： ZHAO Guang-ming SONG Shun-cheng MENG Xiang-rui Department of Resource Exploration and management Engineering Anhui University of Science and Technology Huainan Anhui 232001 China Department of Applied Mechanics and Engineering Southwest Jiaotong University Chengdu Sichuan 610031 China

The Reproducing Kernel Particle Method (RKPM) is one of several new meshless numerical methods de- veloped internationally in recent years. The ideal elasto-plastic constitutive model of material under a Taylor impact is characterized by the Jaumann stress- and strain-rates. An updated Lagrangian format is used for the calculation in a nu- merical analysis. With the RKPM, this paper deals with the calculation model for the Taylor impact and deduces the control equation for the impact process. A program was developed to simulate numerically the Taylor impact of projec- tiles composed of several kinds of material. The simulation result is in good accordance with both the test results and the Taylor analysis outcome. Since the meshless method is not limited by meshes, it is believed to be widely applicable to such complicated processes as the Taylor impact, including large deformation and strain and to the study of the dy- namic qualities of materials.

关键词： Reproducing Kernel Particle Method Taylor impact large deformation meshless method