检索结果-南通市图书馆

Emergency control of Spartina alterniflora re-invasion with a chemical method in Chongming Dongtan,China

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2020年第1期13卷 24-33页

作者： zhi-yuan Zhao Yuan xu Lin Yuan Wei Li Xiao-jing Zhu Li-quan Zhang State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China Institute of Eco-Chongming East China Normal UniversityShanghai 200062China

The exotic species Spartina alterniflora(***)seriously threatens the stability and functioning of saltmarsh ecosystems in the Yangtze *** efforts have been undertaken to control this species,but subsequent re-invasion is frequent,presenting a significant barrier to *** complexity and high cost of integrated physical control programs has necessitated a shift in focus,leading to considerable attention being paid to the potential of herbicides to control *** find a strategy for emergency control of small and scattered patches of re-invading ***,an in situ field experiment using Gallant(Haloxyfop-R-methyl)herbicide was *** growth parameters of plant density and height were used to evaluate the control efficiency of different treatment dosages and times and sediment samples were taken for environmental toxicity *** results show the following:(1)the control efficacy of the maximum proposed application dose(2.70 g/m2)was 92%for continuous swards and 100%for small patches,while those of other dosages(0.45 g/m2,0.90 g/m2,and 1.35 g/m2)were lower than 40%;(2)the appropriate implementation time was July to August with 100%mortality resulting from a single application,while *** was shown to be capable of recovering rapidly after treatment in May;and(3)there were no significant differences in the community structure of meiofauna among the herbicide treatments and the control,and no herbicide residues were detected in sediment samples collected from treatment *** chemical control method was implemented in the Shanghai Chongming Dongtan National Bird Nature Reserve(CDNR).The results of this study indicate that Gallant is an environmentally friendly herbicide with high efficiency,which can be adopted for emergency control of re-invading ***.

关键词： Spartina alterniflora Re-invasion Chemical control method Gallant Yangtze Estuary

在线全文

学校读者我要写书评

暂无评论

斑马鱼在化学品高通量毒性评价中的应用

环境化学 2024年第1期43卷 47-59页

作者：王俊刘力徐颖君刘俊杰程波张蒙庞少臣梁勇宋茂勇武汉工程大学环境生态与生物工程学院武汉430205 江汉大学持久性有毒污染物环境与健康危害湖北省重点实验室环境与健康学院武汉430056 中国科学院生态环境研究中心环境纳米技术与健康效应重点实验室北京100085

随着全球化学品数量的不断增加,传统的哺乳动物毒性评价方式已经无法满足化学品环境监管的需求.21世纪毒性测试转变成以高通量体外测试和非哺乳类动物模型替代方法为主的新模式.斑马鱼既有生物复杂度又具一定的分析通量,是高通量的药物... 详细信息

随着全球化学品数量的不断增加,传统的哺乳动物毒性评价方式已经无法满足化学品环境监管的需求.21世纪毒性测试转变成以高通量体外测试和非哺乳类动物模型替代方法为主的新模式.斑马鱼既有生物复杂度又具一定的分析通量,是高通量的药物筛选和化学品毒性测试中重要的动物模型.本文综述了斑马鱼在化学品高通量毒性评价中应用的重要研究进展,分析了多种自动化技术在斑马鱼高通量分析中的优势和潜力,最后探讨了斑马鱼高通量毒性测试未来的发展方向.本文为研究人员高效利用斑马鱼胚胎开展化学品安全性评价提供参考.

关键词：高通量毒性筛查风险评估斑马鱼化学品

Effects of Al contents on microstructure and properties of hot-dip Zn-Al alloy coatings on hydrogen reduced hot-rolled steel without acid pickling

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2017年第10期24卷 1032-1040页

作者： zhi-feng Li yong-quan He Guang-ming Cao Jun-jian Tang Xiang-jun Zhang Zhen-yu Liu State Key Laboratory of Rolling and Automation Northeastern University School of Mechatronics Engineering Zhengzhou University of Aeronautics

A new hot-dip galvanizing method was employed on hot-rolled low carbon *** effects of Al contents on microstructure,micro-hardness and corrosion resistance of Zn-Al alloy coatings were systematically *** composition,microstructure and element distribution in Zn-Al alloy coatings were analyzed using X-ray diffraction（XRD）and electron probe micro analysis（EPMA）,*** is found that Al content（0.6-6.0 wt.%）in galvanizing zinc affects surface quality and adhesion between coatings and matrix in the newly developed *** addition,with increasing Al content,micro-hardness significantly increased due to the increase in Zn-Al eutectoid *** polarization and electrochemical impedance spectroscopy（EIS）also revealed that increase in Al plays a noticeable role in improving the corrosion resistance of Zn-Al alloy coatings.

关键词： Hot-rolled steel strip Hydrogen reduction Eutectoid structure Micro-hardnessCorrosion resistance Zn-Al alloy coating

Protective effects of ginsenoside Rg1 against hydrogen peroxide-induced injury in human neuroblastoma cells

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2016年第7期11卷 1159-1164页

作者： zhi-gao Sun Li-ping Chen Fa-wei Wang Cheng-yong xu Miao Geng Department of Traditional Chinese Medicine Hainan Branch Hospital of Chinese PLA General Hospital Department of Traditional Chinese Medicine Chinese PLA General Hospital Institute of Gerontology Chinese PLA General Hospital

The active ingredient of ginseng,ginsenosides Rg1,has been shown to scavenge free radicals and improve antioxidant *** study hypothesized that ginsenosides Rg1 has a protective role in human neuroblastoma cells injured by *** Rg1 at different concentrations（50 and 100 μM） was used to treat H2O2（150 μM）-injured SH-SY5 Y *** demonstrated that ginsenoside Rg1 elevated the survival rate of SH-SY5 Y cells injured by H2O2,diminished the amount of leaked lactate dehydrogenase,and increased superoxide dismutase *** Rg1 effectively suppressed caspase-3 immunoreactivity,and contributed to heat shock protein 70 gene expression,in a dose-dependent *** results indicate that ginsenoside Rg1 has protective effects on SH-SY5 Y cells injured by H2O2 and that its mechanism of action is associated with anti-oxidation and the inhibition of apoptosis.

关键词： ginsenoside neuroblastoma peroxide injured protective caspase dehydrogenase suppressed manner antioxidant

Exit morphology and mechanical property of FDM printed PLA: influence of hot melt extrusion process

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2023年第1期11卷 56-74页

作者： Yan-Hua Bian Gang Yu Xin Zhao Shao-Xia Li Xiu-Li He Chong-Xin Tian zhi-yong Li Institute of Mechanics Chinese Academy of SciencesBeijing100190People’s Republic of China School of Engineering Science University of Chinese Academy of SciencesBeijing100049People’s Republic of China Research Institute of 3D Printing Beijing City UniversityBeijing100083People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049People’s Republic of China

In order to study the hot melt extrusion process in fused deposition modeling(FDM),this study mainly explores the effects of printing temperature,heated block length,feeding speed on the exit morphology and mechanical properties of FDM printed Polylactic acid(PLA)***-speed camera is used to capture the exit morphology of molten PLA just extruded to the *** to exit morphology,the outlet states of extruded molten material can be divided into four categories,namely,bubbled state,coherent state,expanding state,and unstable *** test results show that printing temperature,heated block length and printing speed have significant influence on tensile properties and fracture mode of FDM printed *** the heated block length is 15 mm and 30 mm,there is a ductile-brittle transition in fracture mode with the increase of printing *** printing process window under different heated block lengths and printing temperatures has been figured out and the distribution of printing process window under different printing speeds has been *** is a maximum printing process window under the heated block length of 30 *** finding provides a frame work for performance prediction of FDM printed parts and theoretical guidance for expanding the scope of printing process window.

关键词： Fused deposition modeling(FDM) Polylactic acid(PLA) Exit morphology Tensile property Printing process window

Supernova neutrinos in a strangeon star model

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

Research in Astronomy and Astrophysics 2017年第9期17卷 39-50页

作者： Mao Yuan Ji-Guang Lu zhi-Liang Yang Xiao-Yu Lai Ren-Xin xu Department of Astronomy Beijing Normal UniversityBeijing 100875China School of Physics Peking UniversityBeijing 100871China School of Physics and Engineering Hubei University of EducationWuhan 430205China Kavli Institute for Astronomy and Astrophysics at Peking University Beijing 100871China

The neutrino burst detected during supernova SN 1987A is explained in a strangeon star model, in which it is proposed that a pulsar-like compact object is composed of strangeons （strangeon： an abbreviation for ＂strange nucleon＂）. A nascent strangeon star＇s initial internal energy is calculated, with the inclusion of pion excitation （energy around 1053 erg, comparable to the gravitational binding energy of a collapsed core）. A liquid-solid phase transition at temperature - 1 - 2 MeV may occur only a few tens of seconds after core collapse, and the thermal evolution of a strangeon star is then modeled. It is found that the neutrino burst observed from SN 1987A can be reproduced in such a cooling model.

关键词： stars neutron -- supernovae individual (SN 1987A)- neutrinos

Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2022年第11期16卷 1672-1680页

作者： Hai-Long Liao Lan Jiang Hai-Xin Yu zhi-Hao Liu Ji-Wen Fu Guang-Wen Chu yong Luo State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Droplet impacting on the stainless steel wire mesh is very common in chemical devices,like a rotating packed *** wettability of wire mesh significantly affects the liquid flow pattern and liquid dispersion ***,the effect of surface wettability on the impaction phenomena at microscale such as liquid film is still *** this work,the dynamic behavior of liquid film on the surface of wire mesh was analyzed by computational fluid dynamics *** dynamic behavior of liquid film on the surface of wire mesh can be divided into the following three steps:(1)spreading step;(2)shrinkage process;(3)stabilizing or disappearing *** of surface wettability,as well as operating conditions,on wetting area and liquid film thickness were *** to the hydrophilic wire mesh,the final wetting area of hydrophobic wire mesh is zero in most *** average liquid film thickness on the surface of hydrophilic wire mesh is 30.02–77.29μm,and that of hydrophobic wire mesh is 41.76–237.37μ*** work provided a basic understanding of liquid film flow at microscale on the surface with various surface wettabilities,which can be guiding the packing optimization and design.

关键词： stainless steel wire mesh computational fluid dynamics surface wettability liquid film impacting

Dual-stimuli responsive photonic barcodes based on perovskite quantum dots encapsulated in whispering-gallery-mode microspheres

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2023年第3期9卷 423-430页

作者： Baoyuan xu Shuo Yang Xingwei Feng Tongjin Zhang Zhenhua Gao yong Sheng Zhao School of Materials Science&Engineering Qilu University of Technology(Shandong Academy of Sciences)3501 Daxue RoadChangqing DistrictJinan250353Shandong ProvinceChina Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing100190China

Micro/nanoscale photonic barcodes hold great potential for broad applications in items tracking,mul-tiplexed bioassays and *** ever-increasing demand in advanced anti-counterfeiting applications calls for micro/nanoscale barcodes with accurate recognition,large encoding capacity and high security ***,we proposed a strategy to construct the dual-stimuli responsive photonic barcodes based on the perovskite quantum dots(PQDs)doped polymer whispering-gallery-mode(WGM)microcavities via swelling-deswelling *** from the well-defined spherical microcavities,the photoluminescence(PL)spectra of as-prepared composites exhibit a series of sharp peaks characteristics resulting from the effective WGM modulation,which constitutes the fingerprint of a specific resonator and thus allows a definition of photonic *** this basis,we achieved responsive photonic barcodes based on the volatile polar-solvent-controlled luminescence in the mi-crospheres benefitting from the space-confined microcavities and the ionic feature of the ***-over,the light-controlled photonic barcodes have further been acquired through reversibly regulating the inactivation and activation of the energy transfer(ET)process between the PQDs and photochromic *** well-established protocols of PQDs@WGM enable the development of distinct responsive barcodes with multi-responsive features,which will pave an avenue to new types of flexible WGM-based components for optical data recording and security labels.

关键词： Responsive photonic barcodes Perovskite quantum dots Whispering-gallery-mode microsphere Anti-counterfeiting

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

基于带偏随机游动的复制与搜索

通信学报 2009年第12期30卷 93-98页

作者：刘勇罗绪成秦志光电子科技大学计算机科学与工程学院四川成都610054

现有的对等搜索策略能够有效解决流行数据项的定位,但是在稀有数据项搜索方面所需的成本相对较高。根据无结构对等网络中节点度的幂律分布特征,提出一种新的数据项复制与搜索策略,通过基于带偏随机游动的方式定向复制数据项到系统中小... 详细信息

现有的对等搜索策略能够有效解决流行数据项的定位,但是在稀有数据项搜索方面所需的成本相对较高。根据无结构对等网络中节点度的幂律分布特征,提出一种新的数据项复制与搜索策略,通过基于带偏随机游动的方式定向复制数据项到系统中小部分高度节点,资源搜索采用相同的方式进行。分析和模拟结果表明,所提出的资源搜索算法能够以低消息开销和低延迟获得高的搜索成功率。

关键词：对等网络资源搜索复制随机游动