检索结果-南通市图书馆

Nitride-inclusion characterization in lightweight steel and re-precipitation behavior of AlN during heat treatment:effect of Al content

引用

Journal of Iron and Steel Research International 2023年第2期30卷 350-362页

作者： Jin-long Wang sheng-qiang Song Zheng-liang Xue Dai Tang Gang Tong Dong-ming Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Department of Materials Science&Engineering Center for Iron and Steelmaking ResearchCarnegie Mellon UniversityPittsburghPA15213USA Wuhan Iron and Steel Company Limited Wuhan430081HubeiChina

The composition,morphology,size,and number of inclusions in Fe-22Mn-xAl-0.7C(x=0.5%,5.2%,and 10.5%)lightweight steels after smelting and heat treatment experiments are characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy from both 2D and 3D *** inclusions are classified into eight categories according to chemistry and *** the steel sample with a low Al content(0.5%),the inclusions are MnS,AlN-MnS,and Al_(2)O_(3)-MnS,among which Al_(2)O_(3)-MnS is the primary *** the increase in Al content in the steel sample(to 5.2%),the populations of AlN and AlN-MnS inclusions of 1-3μm in diameter increase.A further increase in Al content(to 10.5%)leads to a significant decrease in the amount of AlN inclusions of 1-3μm in diameter,and an increase in the amount of AlN-MnS *** precipitation behavior during the phase transformation is also studied by FactSage 8.0 thermodynamic software,and a precipitation mechanism is proposed based on the calculation *** the heat treatment,AlN inclusions re-precipitate out,due to the interactions between Al and dissolved N in the steel ***,AlN inclusions cannot grow large because of unfavorable kinetic *** re-precipitation phenomenon of AlN is predominant under low Al and high N conditions but not at high Al cases.

关键词： Lightweight steel Al content AlN inclusion Heat treatment Re-precipitation behavior

来源：

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

Transgenic restorer rice line T1c-19 with stacked cry1C*/bar genes has low weediness potential without selection pressure

引用

Journal of Integrative Agriculture 2016年第5期15卷 1046-1058页

作者： HUANG Yao LI Ji-kun qiang sheng DAI Wei-min SONG Xiao-ling Weed Research Lab Nanjing Agricultural University

Stacked（insect and herbicide resistant） transgenic rice T1c-19 with cry1C＊/bar genes, its receptor rice Minghui 63（herein MH63） and a local two-line hybrid indica rice Fengliangyou Xiang 1（used as a control） were compared for agronomic performance under field conditions without the relevant selection pressures. Agronomic traits（plant height, tiller number, and aboveground dry biomass）, reproductive ability（pollen viability, panicle length, and filled grain number of main panicles, seed set, and grain yield）, and weediness characteristics（seed shattering, seed overwintering ability, and volunteer seedling recruitment） were used to assess the potential weediness without selection pressure of stacked transgene rice T1c-19. In wet direct-seeded and transplanted rice fields, T1c-19 and its receptor MH63 performed similarly regarding vegetative growth and reproductive ability, but both of them were significantly inferior to the control. T1c-19 did not display weed characteristics; it had weak overwintering ability, low seed shattering and failed to establish volunteers. Exogenous insect and herbicide resistance genes did not confer competitive advantage to transgenic rice T1c-19 grown in the field without the relevant selection pressures.

关键词： stacked transgenic rice T1c-19 agronomic traits reproductive ability weediness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fitness of F1 hybrids between stacked transgenic rice T1c-19 with cry1C*/bar genes and weedy rice

引用

Journal of Integrative Agriculture 2019年第12期18卷 2793-2805页

作者： HUANG Yao WANG Yuan-yuan qiang sheng SONG Xiao-ling DAI Wei-min Weed Research Laboratory College of Life Sciences Nanjing Agricultural University

Compared to single-trait transgenic crops, stacked transgenic plants may be more prone to become weedy, and transgene flow from stacked transgenic plants to weedy relatives may pose a potential environmental risk because these hybrids could be more advantageous under specific environmental conditions. Evaluation of the potential environmental risk caused by stacked transgenes is essential for assessing the environmental consequences caused by crop-weed transgene flow. The agronomic performance of fitness-related traits was assessed in F1+(transgene positive) hybrids(using the transgenic line T1 c-19 as the paternal parent) in monoculture and mixed planting under presence or absence glufosinate pressure in the presence or absence of natural insect pressure and then compared with the performance of F1–(transgene negative) hybrids(using the non-transgenic line Minghui 63(MH63) as the paternal parent) and their weedy rice counterparts. The results demonstrated that compared with the F1– hybrids and weedy rice counterparts, the F1+ hybrid presented higher performance(P0.05) under natural insect pressure, respectively, lower performance(P0.05) in the absence of insect pressure in monoculture planting, respectively. And compared to weedy rice counterparts, the F1+ hybrid presented higher performance(P0.05) in the presence or absence of insect pressure in mixed planting, respectively. The F1+ hybrids presented nonsignificant changes(P>0.05) under the presence or absence glufosinate pressure under insect or non-insect pressure in monoculture planting. The all F1+ hybrids and two of three F1– hybrids had significantly lower(P<0.05) seed shattering than the weedy rice counterparts. The potential risk of gene flow from T1 c-19 to weedy rice should be prevented due to the greater fitness advantage of F1 hybrids in the majority of cases.

关键词： weedy rice hybrids stacked transgenes safety assessment fitness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synergistic Flame-retardant Effect of Epoxy Resin Combined with Phenethyl-bridged DOPO Derivative and Graphene Nanosheets

引用

Chinese Journal of Polymer Science 2019年第1期37卷 79-88页

作者： Wei Yan Ming-Qiu Zhang Jie Yu sheng-qiang Nie Dai-Qin Zhang Shu-Hao Qin School of Chemistry Sun Yat-sen University School of Chemistry and Materials Engineering Guiyang University National Engineering Research Center for Compounding and Modification of Polymer Materials

Phenethyl-bridged DOPO derivative(DiDOPO)was combined with graphene nanosheets(GNSs)in epoxy resin(EP)to improve its flame *** results indicated that the introduction of only 1.5 wt%DiDOPO/1.5 wt%GNS in EP increased the limited oxygen index(LOI)from 21.8%to 32.2%,hence meeting UL 94 V-0 *** thermogravimetric analyses revealed that char yield rose in presence of GNSs to form thermally stable carbonaceous *** decomposition and pyrolysis products in gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy(TG-FTIR),and the release of large amounts of phosphorus was detected in the gas *** evaluation of flame-retardant effect by cone calorimetry demonstrated that GNSs improved the protective-barrier effect of fire residue of EP/DiDOPO/*** latter was further confirmed by digital photography and scanning electron microscopy(SEM).Also,Raman spectroscopy showed that GNSs enhanced graphitization degree of the resin during ***,the combination of DiDOPO with GNSs provides an effective way for developing high-performance resins with improved flame retardancy.

关键词： Epoxyresin DOPO derivative GNS Flame retardancy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Plant diversity in herbal tea and its traditional knowledge in Qingtian County, Zhejiang Province, China

引用

Plant Diversity 2020年第6期42卷 464-472页

作者： Yujing Liu Renchuan Hu Songsong Shen Zheng Zhang Jing Zhang Xiaoling Song sheng qiang Nanjing Agriculture University College of Life SciencesNanjing 210000China Guangxi Institute of Traditional Medical and Pharmaceutical Sciences Nanning 530022China

Herbal teas composed of locally occurring plant species have long been used as the primary form of health care in Qingtian County,Zhejiang Province,***,large-scale emigration overseas and an aging population threaten the conservation of traditional knowledge of these herbal *** knowledge about the plants used for these herbal teas is not well documented in Qingtian,despite their widespread *** aim of this study was to assess the plant-cultural diversity of plants used as herbal teas,and to point out the prospective value of herbal teas used by Qingtian *** study was conducted using semi-structured interviews,as well as field and market ***-three local informants were *** recorded plant resources,plant parts used,local names,and medicinal *** ethnobotanical indices,including cognitive salience(CS),frequency of citation(FC),index of informant consensus(Fic)and use value(UV),were calculated to analyze the level of representativeness and relative importance of plants used in herbal *** hundred and twenty-nine species belonging to 75 families and 113 genera were reported to be used in herbal tea,with Compositae being the richest *** plants are most commonly used to make herbal teas(66.7%).In this study,informants reported that 92.2%of plant species used in herbal teas are *** most utilized herbal preparation form is dry/*** reported that herbal teas are used to treat 31 *** results show that the highest representativeness,based on CS and FC,was recorded for species Actinidia *** on UV,the top five most used species are Goodyera schlechtendaliana,Plantago asiatica,Prunella vulgaris,Lophatherum gracile and Leonurus *** highest Fic was cited for dental *** study helps document the status of current herbal teas in *** use value and traditional knowledge of herbal teas have provided basic data for further research focused on bi

关键词： Herbal tea Medicine food homology plants Plant-cultural diversity Qingtian

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of amphiphilic tri-block copolymerpoly(vinylpyrrolidone)-b-poly(methyl methacrylate)-b-poly(vinylpyrrolidone) for the modification of polyethersulfone membrane

引用

Chinese Chemical Letters 2011年第3期22卷 370-373页

作者： sheng qiang Nie Fen Ran Chao He Peng Fei Zhao Xiao Hong Wei Jie Li Chang sheng Zhao College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan Universiry Chengdu 610065 China State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology Lanzhou 730050 China

Well-defined amphiphilic tri-block copolymer PVP-b-PMMA-b-PVP was prepared for the first time via successive reversible addition fragmentation chain transfer（RAFT） polymerization using carboxyl-terminated trithiocarbonate as the RAFT *** structure of the copolymer was characterized using FTIR,GPC and ~1H *** block copolymer could be directly blended with polyethersulfone（PES） as a macromolecule additive using N-methyl-2-pyrrolidone（NMP） as the solvent to prepare membranes. The water contact angles for the modified membranes decreased obviously,and therefore,the protein adsorption amount on the membrane surface decreased.

关键词： Polyethersulfone membrane Protein adsorption Surface modification PVP-b-PMMA-b-PVP

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamics of soil inorganic phosphorus fractions at aggregate scales in a chronosequence of Chinese fir plantations

引用

Journal of Mountain Science 2022年第1期19卷 136-150页

作者： ZHANG Zhe HUANG Yong-zhen HE Xin-xin YE Shao-ming WANG sheng-qiang Forestry college Guangxi UniversityNanning 530004China

Successive cultivation of Chinese fir(Cunninghamia lanceolata) would markedly affect the distribution and accumulation of soil inorganic phosphorus(Pi).However,how different chronosequence phases of Chinese fir plantations exerting influences on the quality and quantity of soil Pi fractions in aggregate-scale remain poorly understood. This study researched the dynamic changes of aggregate-related Pi fractions encompassing occluded-P(O-P), aluminum-bound P(Al-P), iron-bound P(Fe-P), and calcium-bound P(Ca-P) in topsoil(0-20 cm) from different stand aged(9-, 17-, and 26-yr) Chinese fir plantations and one nearby abandoned land(CK) in Rongshui County,Guangxi, China. In this study, soil aggregates were classified into micro-aggregates( 2 mm) by one wet-sieving process. As the primary aggregate fractions correlated with better soil aggregate stability, the large macro-aggregates took the highest proportion in all aggregate sizes regardless of various stand ages of Chinese fir plantations. Besides, the 17-yr plantations of Chinese fir displayed the highest stability of aggregates structure. Compared with CK, all four soil Pi fractions from three different stand ages of Chinese fir plantations generally showed increasing *** of chronosequence phases, Al-P was mainly carried by small macro-aggregates. O-P showed the opposite tendency to Al-P, which had the lowest content in small macro-aggregates. Fe-P and Ca-P showed an even distribution in all *** contribution rates and stocks of each Pi fraction exhibited close relevance to the content of soil aggregates. As revealed from the results, planting of Chinese fir before 17-yr was beneficial to prompt the formation of large macro-aggregates and the level of soil P. But after 17-yr, successive monoculture planting of Chinese fir would reduce the stability of soil aggregates and render the losses

关键词： Inorganic phosphorus fractions Soil aggregates Chinese fir plantations Cunninghamia lanceolata

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

某柴油机气门弹簧断裂的分析及改进

引用

内燃机与配件 2024年第2期 67-69页

作者：李栋吕健健徐威风何盛强潍柴动力股份有限公司发动机技术研究院山东潍坊261001

气门弹簧需要承受配气机构往复运动产生的交变载荷,既要保证气门的密封性,又要防止由于惯性力导致的气门跳动,这就要求气门弹簧应具有足够的强度和抗疲劳强度。本文对某柴油机耐久过程中出现的气门弹簧断裂问题,结合材料分析以及计算校... 详细信息

气门弹簧需要承受配气机构往复运动产生的交变载荷,既要保证气门的密封性,又要防止由于惯性力导致的气门跳动,这就要求气门弹簧应具有足够的强度和抗疲劳强度。本文对某柴油机耐久过程中出现的气门弹簧断裂问题,结合材料分析以及计算校核,系统地阐述了气门弹簧断裂的原因,提出改进方案,并进行计算分析和试验验证,目前已经得到了批量验证,为以后新产品开发中气门弹簧设计以及气门弹簧的持续改进提供了参考依据。

关键词：柴油机气门弹簧断裂改进

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FORECAST OF WATER TEMPERATURE IN RESERVOIR BASED ON ANALYTICAL SOLUTION

引用

Journal of Hydrodynamics 2008年第4期20卷 507-513页

作者： JI Shun-wen ZHU Yue-ming qiang sheng ZENG Deng-feng College of Water Conservancy and Hydroelectric Engineering Hohai University Nanjing 210098 China Water Power Plant of Sanhe Shangyoujiang Ganzhou 341212 China

The water temperature in reservoirs is difficult to be predicted by numerical simulations. In this article, a statistical model of forecasting the water temperature was proposed. In this model, the 3-D thermal conduction-diffusion equations were converted into a system consisting of 2-D equations with the Fourier expansion and some hypotheses. Then the statistical model of forecasting the water temperature was developed based on the analytical solution to the 2-D thermal equations. The~ simplified statistical model can elucidate the main physical mechanism of the temperature variation much more clearly than the numerical simulation with the Navier-Stokes equations. Finally, with the presented statistical model, the distribution of water temperature in the Shangyoujiang reservoir was determined.

关键词： water temperature quasi 3-D statistical model thermal conduction-diffusion equation analytical solution regression analysis factor of radiation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cerium-Based Sealing Treatment of Mg–Al Hydrotalcite Film on AZ91D Magnesium Alloy

引用

Acta Metallurgica Sinica(English Letters) 2016年第11期29卷 993-1000页

作者： qiang-sheng Dong Zhi-Xin Ba Zhang-Zhong Wang Juan Kuang Zheng-Yang Cai Chen Yuan School of Materials Science and Engineering Nanjing　Institute of Technology Nanjing 211167 China Jiangsu Key Laboratory of Advanced Structural Materialsand Application Technology Nanjing 211167 China

An environment-friendly cerium-based sealing treatment was developed to improve the surface integrity and corrosion resistance of Mg–Al hydrotalcite film on AZ91D magnesium alloy. The cerium dioxide was generated through three stages namely nucleation, growth and dissolution, modifying the surface of AZ91D Mg alloy, and the hydrotalcite film became integral after being treated for 30 min. The results of polarization curves showed that the anti-corrosive performance of the hydrotalcite film was enhanced by the sealing treatment. Moreover, the immersion tests and electrochemical impedance spectrum measurements also demonstrated that the sealed hydrotalcite film provided a longer-term protection of magnesium alloy from corrosion as compared to the unsealed one.

关键词： AZ91D magnesium alloy Mg-Al hydrotalcite film Sealing treatment Ce-containing solution Corrosion resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：