检索结果-南通市图书馆

Insect Science 2021年第3期28卷 811-824页

作者： Jun-Nan Yang jia-Ning Wei Le kang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijingChina CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijingChina

The pea leafminer,Liriomyza huidobrensis,is an important pest species affecting ornamental crops *** damage consists of oviposition and feeding punctures created by female adult flies as well as larva-bored mines in leaf mesophyll *** plants indirectly defend themselves from these two types of leafminer damage has not been sufficiently *** this study,we compared the indirect defense responses of bean plants infested by either female adults or *** of leaves by adults released green leaf volatiles and terpenoids,while larval feeding caused plants to additionally emit methyl salicylate and(E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene(TMTT).Puncturing of plants by female adults induced increases in jasmonic acid(JA)and JA-related gene expressions but reduced the expressions of salicylic acid(SA)-related *** contrast,JA and SA and their-related gene expression levels were increased significantly by larval *** exogenous application of JA+SA significantly triggered TMTT emission,thereby significantly inducing the orientation behavior of *** study has confirmed that larval feeding can trigger TMTT emission through the activation of both JA and SA pathways to attract parasitoids;however,TMTT alone is less attractive than the complete blend of volatiles released by infested plants.

关键词： jasmonic acid Liriomyza huidobrensis parasitoids salicylic acid TMTT

Experimental,Numerical,and Analytical Studies on the Bending of Mechanically Lined Pipe

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

China Ocean Engineering 2024年第2期38卷 221-232页

作者： WEI Wen-bin YUAN Lin ZHOU jia-sheng LIU Zheng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China School of Mechanical Engineering Tianjin UniversityTianjin 300072China

Mechanically lined pipe(MLP)is often used for offshore oil and gas transport because of its low cost and corrosion *** installation and operation,the pipe may undergo severe bending deformation,which causes the liner to separate from the outer pipe and buckles,affecting the stability of the whole *** this paper,the buckling response of MLP subjected to bending is investigated to clarify its bending characteristics by employing both experiments,numerical simulation,as theoretical *** types of MLPs were manufactured with GB 45 carbon steel(SLP)and Al 6061(ALP)used as the outer pipe material,*** hydraulic expansion and bending experiments of small-scale MLPs are *** addition to the ovalized shape of the cross-section for the SLP specimens,the copper liner was found to wrinkle on the compressive *** contrast,the liner of ALP remains intact without developing any wrinkling and collapse *** addition,a dedicated numerical framework and theoretical models were also *** was found both the manufacturing and bending responses of the MLP can be well reproduced,and the predicted maximum moment and critical curvatures are in good agreement with the experimental results.

关键词： lined pipe bending nonlinear ring theory buckling plasticity

在线全文

学校读者我要写书评

暂无评论

大学物理综合性实验教学效果的调查与思考

实验科学与技术 2011年第6期9卷 103-106页

作者：徐丽琴马颖刘筱燕梁鸿东詹康生贾兰伟广州大学物理与电子工程学院广州510006

大学物理实验教学是理工科院校学生必须要掌握的一门公共基础课程,基于实验教学改革的要求,广州大学在传统实验的基础上增设了综合性实验,希望能够进一步提高学生的综合运用知识能力、动手能力、创新意识、文献检索、独立分析和解决问... 详细信息

大学物理实验教学是理工科院校学生必须要掌握的一门公共基础课程,基于实验教学改革的要求,广州大学在传统实验的基础上增设了综合性实验,希望能够进一步提高学生的综合运用知识能力、动手能力、创新意识、文献检索、独立分析和解决问题的能力。为了能够确保较高的实验教学效果,通过对在校大学生开设大学物理综合性实验的情况进行问卷调查,系统地分析了综合性实验教学的效果及不足之处,并针对影响综合性实验教学效果的主要因素提出探讨与思考。

关键词：大学物理实验综合性实验教学效果调查问卷

Properties of Multiblock Sulfonated Poly(arylene ether sulfone)s Synthesized by Precise Controllable Post-sulfonation for Proton Exchange Membranes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第7期40卷 754-763页

作者： Xing Chen Lei Xiao Xin-sheng Qiu kang-Cheng Chen School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing100081China

A series of multiblock sulfonated poly(arylene ether sulfone)s(SPAES)with various block lengths and predictable ion exchange capacity were synthesized from 4,4’-difluorodiphenyl sulfone,4,4’-dihydrodiphenyl sulfone and 4,4’-biphenol by one-pot and two-pot polymerization.;H-NMR and FTIR spectra confirmed the structure that sulfonic acid groups were introduced precisely on the poly(arylene ether sulfone)s by post-sulfonation which resulted in controllable sulfonation *** proton exchange membranes(PEMs)-based SPAES displayed excellent dimensional,thermal,antioxidant stability,proton conductivity and mechanical properties(maximum tensile stress>35 MPa).Thermogravimetric analysis indicated the prepared SPAES began to degrade above 310℃.The effects of polymerization processes,those were,one-pot hydrophobic segment process,one-pot hydrophilic segment process and two-pot process,on the properties of polymers were *** proton conductivity and microphase separation of SPAES PEMs increased in order of those prepared by one-pot hydrophobic segment process,two-pot process and one-pot hydrophilic segment *** highest conductivities of SPAES synthesized by the above processes under 80℃ and 100%relative humidity were 213(MS4),297(MB3)and 360 mS·cm^(-1)(MQ2),respectively.

关键词： Sulfonated poly(arylene ether sulfone)s(SPAES) Proton exchange membranes One-pot process Two-pot process Post-sulfonation

Numerical simulation of gas-liquid two-phase flow impacting fixed structure by CLSVOF/IB method based on OpenFOAM

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第6期33卷 1176-1189页

作者： Wen-kang Meng Ching-hao Yu jia Li Rui-dong An State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China

In this paper,a coupled level set and volume of fluid,immersed boundary(CLSVOF/IB)method is proposed and implemented into the interFoam solver of the OpenFOAM to simulate the gas-liquid two-phase flows,involving the gas-liquid and fluid-structure *** the volume of fluid(VOF)method,the multidimensional universal limiter with explicit solution(MULES)approach is used to restrain the volume *** approach for calculating the grid characteristic size for the level set(LS)initial function and the re-initialization equation is proposed in order to make it more applicable to non-uniform grids in the finite volume *** the proposed CLSVOF method,the continuous LS function is used to calculate the gas-liquid interface curvature so that the surface tension term can be calculated *** the immersed boundary(IB)method proposed in this paper,a virtual forcing term is introduced in the momentum equation to deal with the fluid-structure interface by defining a solid volume fraction,which is convenient for the three-dimensional numerical *** the present flow field solver,an improved scheme of the velocity predictor loop of the PIMPLE framework is also *** benchmark cases:the Zalesak’s notched disk and a circular bubble at equilibrium,are simulated first to examine the accuracy of the present CLSVOF ***,the effects of several gas-liquid two-phase flows on different fixed structures are *** simulation results are in good agreement with the published numerical and experimental results.

关键词： Volume of fluid(VOF)method level set(LS)method immersed boundary method gas-liquid interface fluid-structure interface

Human herpesvirus 4 and adaptive immunity in Alzheimer’s disease

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

Signal Transduction and Targeted Therapy 2020年第1期5卷 2077-2078页

作者： jian-sheng kang Pei-Pei Liu Clinical Systems Biology Laboratories The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052 HenanChina

In a recent paper published in Nature,Gate et *** adaptive immune changes in Alzheimer’s disease(AD),discovered CD8+T effector memory CD45RA+(TEMRA)cells with proinflammatory and cytotoxic functions in AD patients,and identified two TEMRA cell-recognized antigens of human herpesvirus 4(HHV-4),also known as Epstein–Barr virus(EBV).1 The findings suggested that adaptive immunity might have a role in AD progression.

关键词： immunity CD45RA Alzheimer

The effect of lead levels in the umbilical cord blood and foremilkon the neurobehavioral development of the neonates

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

The effect of lead levels in the umbilical cord blood and fo...

Synthesis,Crystal Structure and Luminescent Mechanochromism of a Square-planar Pt(Ⅱ) Complex Based on 1,10-Phenanthroline Derivative

2011中国妇产科学术会议暨浙江省计划生育与生殖医学学术年会暨生殖健康讲习班

作者： LIU kang-sheng,HAO jia-hu,GU Ping-qing,GUI Ling,SHI Juan,DAI Chun-fang,LIU Xuan Department of Clinical Laboratory of Nanjing Maternity and Child Health Care Hospital,210004,Nanjing,China School of Public Health of Anhui Medical University,Department of Maternity and Child Health Care,230032,Hefei, China Child Health Care Department of Nanjing Maternity and Child Health Care Hospital,210004,Nanjing,China Obstetrical Department of Nanjing Maternity and Child Health Care Hospital,210004,Nanjing,China Department of Clinical Laboratory,the Second Affiliated Hospital of Southeast University,Nanjing,210003,China

Objective To explore the relationship of lead levels in umbilical cord blood and foremilk with the neurobehavioral development of neonates with intrauterine exposure to lead at low level. Methods Lead levels in umbilical cord blood,which could be determined as indicators for intrauterine exposure to lead, were determined for 170 randomly selected neonates delivered at Nanjing Maternity and Child Health Care Hospital. Neonatal behavioral neurological assessment(NBNA) total score were determined as effect index.A descriptive analysis was applied to evaluate their *** neonates were divided into two groups of high- and low-exposure based on the cutoff lead values of 10μg/dl. Results There were significant differences in scores of NBNA and initiative muscle tension with P<0.05 between the groups of high and low lead levels in umbilical cord blood,and the score of the primitive reflex showed difference with P<0.01,while no difference could be observed in the behavioral capability,passive muscle tension and general evaluation. Conclusion The lead in the foremilk could transfer to the neonates,resulting in adverse effect on the early neurobehavioral development of neonates.

关键词： Foremilk Umbilical cord blood Lead Neurobehavioral development

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第1期39卷 140-146,5页

作者： kang jia-jia NI Jun LI Yan-Qin Chemistry Department Dalian University of TechnologyDalian 116024China

A new square-planar platinum(Ⅱ) complex, [Pt(Me3SiC≡Cphen)(C≡CC6H4Cl-3)2](1), was synthesized by using 3-trimethylsilylethynyl-1,10-phenanthroline(Me3SiC≡Cphen) and 3-chlorophenylacetylene ligands, and its structure was characterized by single-crystal X-ray crystallography. 1 crystallizes in triclinic, space group P1 with a = 6.9524(5), b = 12.7796(11), c = 17.5846(10) ?, α = 78.484(5), β = 88.700(5), γ = 75.600(6)°, V = 1482.23(19) ?3, Z = 2, C33H24Cl2N2 PtSi, Mr = 742.62, Dc = 1.664 g/cm3, F(000) = 724, μ(Mo Ka) = 4.979 mm-1, R = 0.0369 and wR = 0.0786. In 1, adjacent molecules along the a axis are stacked in a columnar structure through π···π interactions, and such neighboring columnar structures are connected with each other by C–H···π hydrogen bonds to form a 2D supramolecular network. 1 exhibits reversible luminescence mechanochromic property with the luminescence red shift in a range of ca. 146~182 nm. Extremely large red-shifts of luminescence spectra suggest that luminescent mechanochromic property of 1 is due to the formation of aggregate via Pt–Pt interaction during the mechanical grinding. Based on this property, a simple device was developed and used for rewritable data storage.

关键词： Pt(Ⅱ)complex crystal structure luminescent mechanochromism data recording device

A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2007年第6期7卷 764-770页

作者： sheng-Peng Li Qiu-sheng Gu Ying-He Zhao jia-sheng Huang Xin-Lian Luo Department of Astronomy Nanjing University Nanjing 210093 Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138

We present a study of the dwarf elliptical galaxy NGC 855 using the narrow-band Hα and Spitzer data. Both the Hα and Spitzer IRAC images confirm star-forming activity in the center of NGC 855. We obtained a star formation rate （SFR） of 0.022 and 0.025Mo yr^-1, respectively, from the Spitzer IRAC 8.0 μm and MIPS 24 #m emission data. The HI observation suggests that the star-forming activity might be triggered by a minor merger. We also find that there is a distinct IR emission region in 5.8 and 8.0 μm bands, located at about 10＂ away from the nucleus of NGC 855. Given the strong 8.0 μm but faint Hα emission, we expect that it is a heavily obscured star-forming region, which needs to be confirmed by further optical spectroscopic observations.

关键词： galaxies elliptical -- galaxies individual NGC 855

Treatment of Wet FGD Wastewater by a Modified Chemical Precipitation Method Using a Solid Powder Reagent

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2017年第2期23卷 110-121页

作者： Yong kang jia Lu Jing Guo School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China

This research focused on developing a modified chemical precipitation (MCP) method for treating wet flue gas desulfurization (FGD) waste water by adding a solid powder reagent directly. Simulated wet FGD wastewater was treated by MCP method in simulation experiments. Optimization experiments were carried out with the help of response surface methodology (RSM) and central composite design (CCD) to evaluate the effects and the interactions of experimental variables, including reagent dosage, temperature and pH value. The optimal reagent dosage, temperature and pH value were 3018.0 mg/L, 40.5 °C and 5.7, respectively. The RSM was demonstrated as an appropriate approach for the optimization of wet FGD wastewater treatment with the MCP method. A comparative study between the MCP method and the traditional chemical precipitation (TCP) method on raw wet FGD wastewater treatment was conducted. Results indicate that the MCP had less reagent dosage and variety than the TCP method had. Thus, the MCP method had a lower cost. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.

关键词： Charge coupled devices pH Transmission control protocol Wastewater treatment