检索结果-南通市图书馆

Estimation of the potential geographical distribution of a new potato pest(Schrankia costaestrigalis) in China under climate change

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2023年第8期22卷 2441-2455页

作者： XIAN Xiao-qing ZHAO Hao-xiang GUO Jian-yang ZHANG gui-fen liu Hui liu Wan-xue WAN fang-hao State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing100193P.R.China The National Agro-Tech Extension and Service Center Beijing 100193P.R.China

Global food security is threatened by the impacts of the spread of crop pests and changes in the complex interactions between crops and pests under climate *** costaestrigalis is a newly-reported potato pest in southern ***-warning monitoring of this insect pest could protect domestic agriculture as it has already caused regional yield reduction and/or quality decline in potato *** research aimed to confirm the potential geographical distributions(PGDs)of *** in China under different climate scenarios using an optimal MaxEnt model,and to provide baseline data for preventing agricultural damage by *** findings indicated that the accuracy of the optimal MaxEnt model was better than the default-setting model,and the minimum temperature of the coldest month,precipitation of the driest month,precipitation of the coldest quarter,and the human influence index were the variables significantly affecting the PGDs of *** highly-and moderately-suitable habitats of *** were mainly located in eastern and southern *** PGDs of *** in China will decrease under climate *** conversion of the highly-to moderately-suitable habitat will also be significant under climate *** centroid of the suitable habitat area of *** under the current climate showed a general tendency to move northeast and to the middle-high latitudes in the *** agricultural practice of plastic film mulching in potato fields will provide a favorable microclimate for *** in the suitable *** attention should be paid to the early warning and monitoring of *** in order to prevent its further spread in the main areas in China’s winter potato planting regions.

关键词： climate change potential geographical distribution crop insect pests Schrankia costaestrigalis MaxEnt model

Chinese wisdom and modern innovation of aquaculture

在线全文

学校读者我要写书评

暂无评论

Water Biology and Security

Water Biology and Security 2024年第3期3卷 1-8页

作者： Jian-fang gui State Key Laboratory of Freshwater Ecology and Biotechnology Hubei Hongshan LaboratoryThe Innovation Academy of Seed DesignInstitute of HydrobiologyChinese Academy of SciencesWuhanChina University of Chinese Academy of Sciences BeijingChina

Aquaculture originates from ancient Chinese wisdom,and is considered the most efficient food-producing *** 70 years ago,New China proposed an industrial approach to fish production and made a policy decision to begin modern aquaculture *** one of lucky persons since the early 1980s,I have committed my scholarly career to the studies on genetics and breeding biotechnology of polyploid gibel carp(Carassius gibelio).Here,several significant recent innovations,such as the proposition of the amphitriploid concept,the association of ploidy changes with reproduction transition,the finding of a unique ameiofusiongenesis mode,the establishment of a controllable fertility approach,the creation of intermuscular bonefree mutants,as well as the recreation of desirable goldfish,are introduced and emphasized from an active participant of these ***,some modern innovations and contributions are also highlighted in other aspects of aquaculture including feed development,disease control,facilities and equipment upgrading,as well as paradigm and mode *** comprehensive synthesis of ancient Chinese wisdom and modern innovations seeks to provide valuable insights into the field from a historical basis.

关键词： Aquaculture Genetic breeding Seed industry Biotechnology Gibel carp Goldfish

Application of artificial synapse based on all-inorganic perovskite memristor in neuromorphic computing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Materials Science 2024年第1期6卷 68-76页

作者： fang Luo Wen-Min Zhong Xin-gui Tang Jia-Ying Chen Yan-Ping Jiang Qiu-Xiang liu School of Physics&Optoelectric Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou510006China

Artificial synapse inspired by the biological brain has great potential in the field of neuromorphic computing and artificial *** memristor is an ideal artificial synaptic device with fast operation and good ***,we have prepared a memristor device with Au/CsPbBr_(3)/ITO *** memristor device exhibits resistance switching behavior,the high and low resistance states no obvious decline after 400 switching *** memristor device is stimulated by voltage pulses to simulate biological synaptic plasticity,such as long-term potentiation,long-term depression,pair-pulse facilitation,short-term depression,and short-term *** transformation from short-term memory to long-term memory is achieved by changing the stimulation *** addition,a convolutional neural network was constructed to train/recognize MNIST handwritten data sets;a distinguished recognition accuracy of~96.7%on the digital image was obtained in 100 epochs,which is more accurate than other memristor-based neural *** results show that the memristor device based on CsPbBr3 has immense potential in the neuromorphic computing system.

关键词： Memristor CsPbBr_(3) Resistive switching Artificial synapse Neuromorphic computing

Reactor protection system testing for the solid fuel thorium molten salt reactor

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第5期27卷 238-246页

作者： Zhen-Bao liu Ye liu gui-Min liu Jie Hou Shanghai Institute of Applied Physics Chinese Academy of Sciences Jiading campus Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049China

Safety system testing is one of the most rigorous and time-consuming requirements in the verification and validation process for reactor protection systems(RPSs).This paper presents the development of a test system for the fully digital and field-programmable gate array-based RPS of the solid fuel(SF) thorium-breeding molten salt pebble bed fluoride salt-cooled reactor(TMSR),denoted as the TMSR-SF1 project,developed by the Chinese Academy of *** test system is applied to the RPS to ensure that it fully meets its designed functions and system *** first introduce the testing principles and ***,the hardware component designs and the software program development of the test system are ***,the test process and test results are discussed and summarized.

关键词：反应堆保护系统试验过程固体燃料熔盐现场可编程门阵列测试系统钍设计功能

Spatial dependence of high energy electrons and their radiations in pulsar wind nebulae

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第6期16卷 47-58页

作者： fang-Wu Lu Quan-gui Gao Li Zhang Department of Astronomy Key Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan University Department of Physics Yuxi Normal University

We investigate the spatial dependence of high energy electrons and their radiations in pulsar wind nebulae （PWNe）. By assuming a time-dependent broken power-law injection and spatial dependence of convection velocity, magnetic field strength and diffusion coefficient on the radial distance of an expand- ing system, we numerically solve the Fokker-Planck transport equation including convection, diffusion, adiabatic loss and radiative loss in spherical coordinates, and investigate the effects of magnetic field, PWN age, maximum energy of electrons, and diffusion coefficient on electron spectra and non-thermal photon emissions. Our results indicate that （1） electron spectra and the corresponding photon spectra are a function of radial distance r of the expanding system; （2） for a given expansion velocity, the increase of the PWN age causes a slower decrease of the convection velocity （V ∝ r-β） and a more rapid decrease of the magnetic field strength （B ∝ r-1＋β）, but a more rapid increase of the diffusion coefficient （k∝ r1-β） because the index β decreases with the PWN age; and （3） the lower energy part of the electron spectra is dominated by convection and adiabatic loss, but the higher energy part is dominated by the competition between syn- chrotron loss and diffusion, and such a competition is a function of radial distance. Therefore the diffusion effect has an important role in the evolution of electron spectra as well as non-thermal photon spectra in a PWN.

关键词： diffusion -- ISM: supernova remnants -- pulsars: general -- radiation mechanisms: non-thermal

High-temperature mechanical properties of near-eutectoid steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第9期20卷 829-834页

作者： Jun Fu Fu-ming Wang fang Hao gui-xiang Jin State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The high-temperature mechanical properties of near-eutectoid steel were studied with a Cleeble-1500 simu- lation machine. Zero strength temperature （ZST）, zero ductility temperature （ZDT）, hot ductility curves, and strength curves were measured. Two brittle zones and one plastic zone were found in the temperature range from the melting point to 600℃. Embrittlement in zone I is caused by the existence of liquid film along dendritic interfaces. Ductility loss in zone Ⅲ mainly results from precipitates and inclusions as well as S segregation along grain boundaries. Pearlite transformation also accounts for ductility deterioration in the temperature range of 700-600℃. Moreover, the straightening temperature of the test steel should be higher than 925℃ for avoiding the initiation and propagation of surface cracks in billets.

关键词： carbon steel eutectic alloys high temperature properties mechanical properties brittleness straightening billets

Genetic Relationships Among Chinese Maize OPVs Based on SSR Markers

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第7期12卷 1130-1137页

作者： SONG Li-ya liu Xue CHEN Wei-guo HAO Zhuan-fang BAI Li ZHANG De-gui Beijing Key Laboratory of Plant Resources Research and Development Beijing Technology and Business University Institute of Crop Science Chinese Academy of Agricultural Sciences

Bulk-SSR method was used to analyze the genetic diversity of 44 open-pollinated varieties collected from Henan, Shandong, Shanxi, and Jilin provinces and Guangxi Zhuang Autonomous Region, China using 70 pairs of SSR primers. The purposes of this study were to （1） compare the genetic diversity among 44 Chinese maize open-pollinated varieties; （2） estimate the minimum number of alleles for construction of a stable dendrogram; and （3） trace the genetic relationships among local germplasm from different regions of China. In total, these 70 SSR primers yielded 292 alleles in 176 samples （4×44） analyzed. The number of alleles per locus was 4.17 on average and ranged from 2 to 8. The highest number of alleles per open-pollinated variety （55.25） was detected in Shanxi germplasm, which indicated that open-pollinated varieties from Shanxi possessed the largest genetic diversity among those from the five locations. The correlation coefficients between different genetic similarity matrices suggested that 200 alleles were sufficient for analysis of the genetic diversity of these 44 open-pollinated varieties. The cluster analysis showed that 44 open-pollinated varieties collected from three growing regions in China were accurately classified into three groups that were highly consistent with their geographic origins, and there is no correlation between GS and geographic distance in this study.

关键词： Bulk-SSR genetic diversity maize OPVs

The Connectivity and Minimum Degree of Circuit Graphs of Matroids

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第2期26卷 353-360页

作者： Ping LI gui Zhen liu ematics and System Sciences Shandong University Ji'nan 250100 P. R. China School of Mathematics and System Sciences Shandong University Ji'nan 250100 P. R. China

Let G be the circuit graph of any connected matroid M with minimum degree 5（G）. It is proved that its connectivity κ（G） ≥2｜E（M） - B（M）｜ - 2. Therefore 5（G） ≥ 2｜E（M） - B（M）｜ - 2 and this bound is t... 详细信息

关键词： matroid circuit graph of matroid connectivity

f-Colorings of Some Graphs of f-Class 1

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2008年第5期24卷 743-748页

作者： Xia ZHANG gui Zhen liu College of Mathematics Science Shandong Normal University Ji'nan 250014 P. R. China School of Mathematics and System Sciences Shandong University Ji'nan 250100 P. R. China School of Mathematics and System Sciences Shandong University Ji'nan 250100 P. R. China

An f-coloring of a graph G is an edge-coloring of G such that each color appears at each vertex v V（G） at most f（v） times. The minimum number of colors needed to f-color G is called the f-chromatic index of G and is denoted by X′f（G）. Any simple graph G has the f-chromatic index equal to △f（G） or △f（G）＋ 1, where △f（G） =max v V（G）{[d（v）/f（v）]}. If X′f（G） = △f（G）, then G is of f-class 1; otherwise G is of f-class 2. In this paper, a class of graphs of f-class 1 are obtained by a constructive proof. As a result, f-colorings of these graphs with △f（G） colors are given.

关键词： simple graph edge-coloring f-coloring classification of graphs f-chromatic index