检索结果-南通市图书馆

福建林业科技 1998年第3期25卷 40-45页

作者：何学友福建省林业技术发展研究中心

调查研究表明：福建省木麻黄衰枯现象是由多种因素引起的一种林木衰退病，其诱发因素主要是树种、种源的不适应，土壤肥力下降、水分失调：激化因素主要是星天牛、木毒蛾等虫害及风沙害；促进因素是引起木质部变色的次生病原菌。

关键词：福建木麻黄衰枯原因衰退病虫害沙害

Comparison of the Effects of Pesticide Application on Biston suppressaria Larvae in Different Damage Stages

在线全文

学校读者我要写书评

暂无评论

Plant Diseases and Pests 2021年第3期12卷 1-3,8页

作者： hezai Lin Shouping Cai xueyou he Liqiong Zeng Haitian Song Qingquan Wu Zhangpu County Forestry Bureau Zhangpu 363200China Fujian Academy of Forestry Sciences Key Laboratory of Timber Forest Breeding and Cultivation for Mountainous Areas in Southern ChinaState Forestry AdministrationFuzhou 350012China Pinghe Tianma State-owned Forest Farm Pinghe363000China

[Objective] The paper was to determine the optimal control period of Biston suppressaria, the most serious defoliator in eucalyptus forests in southern Fujian Province. [Method] By spraying 2% abamectin + Bacilus thuringiensis powder in the forest, the first generation larvae of B. suppressaria was controlled in the early damage stage(May 2), middle damage stage(May 13) and late damage stage(May 30), respectively.[Result] When 500 g of pesticide was sprayed per 667 m^(2) in the early damage stage of the first generation larvae, the population reduction rate was97.5 % at 5 d post spraying. When 500 g of pesticide was sprayed per 667 m^(2) in the middle damage stage, the population reduction rate was 95.3% at 5 d post spraying. When 1 000 g of pesticide was sprayed per 667 m^(2) in the late damage stage, the population reduction rate was 83.9%, conspicuously lower than those in the early and middle damage stage. If pesticides were sprayed in the early and middle damage stage, the second gen-eration larvae would not cause harms, but the second generation larvae would cause slight harms if pesticides were sprayed in the late damage stage.[Conclusion] Control before the middle damage stage has significant effect on improving the control effect and reducing losses while reducing the usage of pesticides.

关键词： Biston suppresaria Larvae Chemical control Control effect

Correlation between Inclusion Contents in Casuarina spp. Twigs and Its Resistance to Lymantria xylina

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

Plant Diseases and Pests 2014年第4期5卷 9-12页

作者： Huang Jinshui Lin Xiuqin Cai Shouping Zeng Liqiong Ke Yuzhu he xueyou Chen Shunli Fujian Academy of Forestry Sciences Fujian Agriculture and Forestry University

[ Objective ] The paper was to explore the correlation between inclusion contents in Casuarina spp. twigs and its resistance to Lymantria xylina. [ Method] Three types of representative Casuar/na spp. strains including resistant strains （Zhanjiang 3, Hui 76, Hui 83, Guangdong A8-2）, moderate resistant strains （Pingtan 2, Hui 1, Long 7-18） and susceptible strains （Dongshan 2, Guangdong 501, Kang[eng） were tzst~ as materials to determine the contents of six kinds of inclusions, total phenol, tannin, flavonoids, protein, soluble sugar and polysaccharide. [ Result] The resistant strains had higher flavonaids, tannin and total phenol contents and lower soluble sugar and protein contents than the susceptible strains, while the content of polysaccharide acted randomly. The grey correla- tivity analysis showed that resistance degree, pupation rate and pupal weight had high correlation with protein and soluble sugar contents, with correlation index equal to or above 0.500 0. [ Conclusion] The study provided a theoretical basis for screening and promotion of resistant strains against L xylina.

关键词： Casuar/na spp. Twigs Inclusions Lymantria xylina Swinhee Resistance mechanism

危害乳源木莲叶片的枝膜叶蜂属(膜翅目:叶蜂科)一新种

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

林业科学 2022年第1期58卷 62-69页

作者：牛耕耘何学友曾丽琼魏美才江西师范大学生命科学学院南昌330022 福建省林业科学研究院国家林业和草原局南方山地用材林培育重点实验室福州350012

报道福建省危害乳源木莲叶片的一种专食性害虫——黄氏枝膜叶蜂Cladiucha huangbki Niu&Wei,***.。该种的潜在分布区包括广东北部、浙江、江西和湖南等乳源木莲分布区。黄氏枝膜叶蜂与大鞘枝膜叶蜂*** Wei最近似,但本种体型较小;雌虫触... 详细信息

报道福建省危害乳源木莲叶片的一种专食性害虫——黄氏枝膜叶蜂Cladiucha huangbki Niu&Wei,***.。该种的潜在分布区包括广东北部、浙江、江西和湖南等乳源木莲分布区。黄氏枝膜叶蜂与大鞘枝膜叶蜂*** Wei最近似,但本种体型较小;雌虫触角22+3节,明显长于头部宽的2倍;颚眼距0.4倍于侧单眼直径;中窝浅平,上部无深坑;单眼后区侧沟向后明显分歧;锯腹片中部锯刃平直;寄主为乳源木莲等,与大鞘枝膜叶峰明显不同。枝膜叶蜂属已经测定3种线粒体基因组数据,黄氏枝膜叶蜂与刻胸枝膜叶蜂*** Wei形态差距较大,但线粒体基因组十分近似,其COⅠ等其他12个蛋白质编码基因差距很小,但2种nad2基因的P距离为4.86,差别十分明显,这也是膜翅目广腰亚目内第一个被报道确认的近缘种间COⅠ差距微小但nad2差距很大的事例。为方便危害木兰科植物的枝膜叶蜂属种类鉴定,本研究编制了世界枝膜叶蜂属分种检索表。

关键词：膜翅目叶蜂科巨基叶蜂亚科枝膜叶蜂属中国木兰科

在线全文

学校读者我要写书评

暂无评论

油茶的一种新害虫——黑足角胸叶甲

中国森林病虫 2011年第3期30卷 16-17页

作者：何学友蔡守平吴智才福建省林业科学研究院福建福州350012 国家林业局南方山地用材林培育重点实验室福建福州350012 邵武市森林病虫害防治检疫站福建邵武354000

报道了危害油茶的新害虫——黑足角胸叶甲Basilepta melanopus。现有文献仅记载该虫严重危害茶树,也可取食珍珠菜,但未见危害油茶的报道。对福建省清流县、邵武市油茶林样地的调查表明：油茶株受害率100%,叶片受害率15%~90%,危害较为严... 详细信息

报道了危害油茶的新害虫——黑足角胸叶甲Basilepta melanopus。现有文献仅记载该虫严重危害茶树,也可取食珍珠菜,但未见危害油茶的报道。对福建省清流县、邵武市油茶林样地的调查表明：油茶株受害率100%,叶片受害率15%~90%,危害较为严重。介绍了黑足角胸叶甲成虫形态特征、分布范围、危害特征以及生物学特性等,并提出了防治建议。

关键词：油茶新害虫黑足角胸叶甲危害特征

Honeycomb-like biochar framework coupled with Fe_(3)O_(4)/FeS nanoparticles as efficient heterogeneous Fenton catalyst for phenol degradation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 390-399页

作者： Aihua Cheng Yi he Xiaohe Liu Chi he Department of Environmental Engineering College of Geology and EnvironmentXi’an University of Science and TechnologyXi’an 710054China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China National Engineering Laboratory for VOCs Pollution Control Material and Technology University of Chinese Academy of SciencesBeijing 101408China

Achieving an efficient and stable heterogeneous Fenton reaction over a wide pH range is of great significance for wastewater ***,a pollen-derived biochar catalyst with a unique honeycomb-like structure,coupled with the dispersion of magnetic Fe_(3)O_(4)/FeS(Fe/S)nanoparticles,was synthesized by simple impregnation precursor,followed by *** prepared Fe/S-biochar catalyst demonstrated outstanding phenol degradation efficiency across a wide pH range,with 98%of which eliminated even under neutral conditions(pH 7.0).The high catalytic activity was due to the multilevel porous structure of pollenderived biochar provided enough active sites and allowed for better electron transfer,then increases oxidation ability to promote the ***,the acid microenvironment formed by SO_(4)^(2-)group from Fe/S composite extended the pH range for Fenton reaction,and S^(2-)facilitated the conversion of≡Fe^(3+)to≡Fe^(2+),resulting in remarkable degradation ***,biochar can effectively promote cycling stability by limiting Fe *** work may provide a general strategy for designing 3D framework biochar-based Fe/S catalysts with excellent performance for heterogeneous Fenton reactions.

关键词： Biomass Biochar Fenton reaction Fe_(3)O_(4)/FeS(Fe/S) Phenol degradation

H-and J-aggregation of conjugated small molecules in organic solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第6期93卷 174-192,I0005页

作者： Qiaoqiao Zhao Feng he State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353ShangdongChina Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen 518055GuangdongChina Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055GuangdongChina

As H-and J-aggregation receive more and more attention in the research of organic solar cells(OSCs),especially in small molecular systems,deep understanding of aggregation behavior is needed to guide the design of conjugated small molecular structure and the fabrication process of OSC *** this end,this review is ***,the review firstly introduced the basic information about H-and J-aggregation of conjugated small molecules in ***,the characteristics of H-and J-aggregation and the methods to identify them were ***,it reviewed the research progress of H-and J-aggregation of conjugated small molecules in OSCs,including the factors influencing H-and J-aggregation in thin film and the effects of H-and J-aggregation on OPV performance.

关键词： H-aggregation J-aggregation Organic solar cells Small molecules Efficiency Stability

Distributed Optimal Variational GNE Seeking in Merely Monotone Games

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第7期11卷 1621-1630页

作者： Wangli he Yanzhen Wang IEEE the Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of EducationEast China University of Science and TechnologyShanghai 200237China

In this paper, the optimal variational generalized Nash equilibrium(v-GNE) seeking problem in merely monotone games with linearly coupled cost functions is investigated, in which the feasible strategy domain of each agent is coupled through an affine constraint. A distributed algorithm based on the hybrid steepest descent method is first proposed to seek the optimal v-GNE. Then, an accelerated algorithm with relaxation is proposed and analyzed, which has the potential to further improve the convergence speed to the optimal v-GNE. Some sufficient conditions in both algorithms are obtained to ensure the global convergence towards the optimal v-GNE. To illustrate the performance of the algorithms, numerical simulation is conducted based on a networked Nash-Cournot game with bounded market capacities.

关键词： Distributed algorithms equilibria selection generalized Nash equilibrium(GNE) merely monotone games

A theory for three-dimensional response of micropolar plates

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1403-1414页

作者： Dianwu HUANG Linghui he College of Civil Engineering and Architectural Jiaxing UniversityJiaxing 314001Zhejiang ProvinceChina Department of Modern Mechanics and State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China

Through combined applications of the transfer-matrix method and asymptotic expansion technique,we formulate a theory to predict the three-dimensional response of micropolar *** ad hoc assumptions regarding through-thickness assumptions of the field variables are made,and the governing equations are two-dimensional,with the displacements and microrotations of the mid-plane as the *** the deformation of the mid-plane is solved,a three-dimensional micropolar elastic field within the plate is generated,which is exact up to the second order except in the boundary region close to the plate *** an illustrative example,the bending of a clamped infinitely long plate caused by a uniformly distributed transverse force is analyzed and discussed in detail.

关键词： micropolar plate transfer-matrix asymptotic expansion three-dimensional response

Distributed Nash Equilibrium Seeking on Compact Action Sets over Jointly Strongly Connected Switching Networks

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年第1期37卷 63-81页

作者： he Xiongnan HUANG Jie Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kong 999077China.

This paper studies the distributed Nash equilibrium seeking(DNES)problem for games whose action sets are compact and whose network graph is switching satisfying the jointly strongly connected *** keep the actions of all players in their action sets all the time,one has to resort to the projected gradient-based *** the assumption that the unique Nash equilibrium is the unique equilibrium of the pseudogradient system,an algorithm is proposed that is able to exponentially find the Nash ***,the authors also consider the distributed Nash equilibrium seeking problem for games whose actions are governed by high-order integrator dynamics and belong to some compact *** examples are used to illustrate the proposed approach.

关键词： Compact action sets jointly strongly connected switching graphs Nash equilibrium seeking projected gradient-based algorithm.