检索结果-南通市图书馆

Study on adhesively-bonded surface of tapered double cantilever specimen made of aluminum foam affected with shear force

引用

Journal of Central South University 2015年第12期22卷 4521-4527页

作者：孙洪鹏 CHO Jae-ung Division of Mechanical Engineering Graduate School Kongju National University Division of Mechanical and Automotive Engineering Kongju National University

Aluminum foam is widely used in diverse areas to minimize the weight and maximize the absorption of shock energy in lightweight structures and various *** presents a number of advantages,such as low density,incombustibility,non-rigidity,excellent energy absorptivity,sound absorptivity and low heat *** aluminum foam with an air cell structure was placed under the TDCB Mode II tensile load by using Landmark equipment manufactured by MTS to examine the shear failure *** angle of the tapered adhesively-bonded surfaces of specimens was designated as a variable,and three models were developed with the inclined angles differing from one another at 6°,8° and 10°.The specimens with the inclined angles of 6°,8° and 10° have the maximum reaction forces of 168 N,194 N when the forced displacements are 6,5 and 4.2 mm *** are three specimens with the inclined angles of 10°,8° and 6° in the order of maximum reaction *** the analysis result,the maximum equivalent stresses of 0.813 MPa and 0.895 MPa happened when the forced displacements of 6 mm and 5 mm proceeded at the models of 6° and 8°,respectively.A simulation was carried out on the basis of finite element method and the experimental *** results of the experiment and the simulation analysis are shown not different from each other ***,only a simulation could be confirmed to be performed in substitution of an experiment,which is costly and time-consuming in order to determine the shearing properties of materials made of aluminum foam with artificial data.

关键词： adhesive displacement force reaction shearing fracture characteristic tapered double cantilever beam(TDCB)

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

Optimization Design of Micro-irrigation Laterals with Small Tube Emitter and Pressure Compensating Emitter

Optimization Design of Micro-irrigation Laterals with Small ...

引用

作者： ame Michael Aliyi 扬州大学

学位级别：硕士

微灌在世界范围内得到广泛应用,它可以有效节省灌溉用水量,并可以提高农产品产量和质量。但是微灌也有投资费用较高的缺点。微灌主要有滴灌、微喷灌和小管出流灌（涌泉灌）等类型。其中,小管出流灌在中国北方果树灌溉（如苹果）中应用... 详细信息

微灌在世界范围内得到广泛应用,它可以有效节省灌溉用水量,并可以提高农产品产量和质量。但是微灌也有投资费用较高的缺点。微灌主要有滴灌、微喷灌和小管出流灌（涌泉灌）等类型。其中,小管出流灌在中国北方果树灌溉（如苹果）中应用比较广泛,为保证小管出流均匀,大多安装稳流器,即通过稳流器将灌水小管与毛管连接起来;滴灌应用最为广泛,传统的孔口滴头已被压力补偿式滴头所代替,采用压力补偿式滴头可以获得很高的滴灌均匀度。滴灌管以使用方便著称,为提高灌水质量,滴灌管内镶的管上滴头也开始被压力补偿式管上滴头所替代。因此,不管是小管出流灌,还是滴灌,采用具有压力补偿式的灌水器（小管稳流器或压力补偿式滴头）均具有较好的前景。然而目前在微灌系统设计中,针对采用压力补偿式灌水器的毛管设计还缺乏科学合理的方法。干、支管由于有明确的设计流量,可以利用经济流速,确定合理的经济管径。但是对于毛管而言,由于毛管从首端到末端,其流量是变化的,其流速也是变化的,因此不能采用经济流速确定其合理管径。按目前的设计方法,采用压力补偿式灌水器时,一般是根据水力准则的相关规定确定毛管的管径,也就是只需满足毛管上各灌水器（小管或滴头）的工作压力都在允许的工作压力范围内,即工作压力不小于最小工作压力,且不大于最大工作压力。然而有些压力补偿式灌水器的允许工作压力范围很大（达5m～40m水头）,在实际设计中,可能会出现采用多种不同管径（如De12、De26、De20等）都满足水力准则的情况。此时就存在如何具体选择管径的问题,若采用管径较小的毛管,则管材投资较小,但因水头损失增加,运行能耗费用较大;反之,若采用管径较大的毛管,则管材投资较大,运行能耗费用会较小。本文旨在解决这一实际问题,即在毛管设计中,在安装压力补偿式灌水器的情况下,如何在满足水力准则的条件下根据经济准则（即综合成本费用最小）来确定毛管经济管径。1.研究内容与优化原理（1）研究内容在微灌系统中,毛管管径较小,单价较低,但因为数量很多,其成本在工程总成本费用中仍占很大比例。因此,为了节省总成本费用,研究毛管的经济管径也十分重要。鉴于上述实际需要,本文系统研究毛管单元的总成本费估算方法,以年成本费用最小为目标,分别针对采用稳流器的小管出流灌溉系统和采用压力补偿式滴头的滴灌系统的毛管,分析其在各种可能情况下的经济管径,从而为这类微灌系统毛管设计提供有益参考。（2）优化原理以总成本费用最小为目标,以管径为决策变量,以压力补偿式灌水器的允许工作压力范围为约束条件（水力准则）。毛管管径（d）是离散变量,毛管管径种数（n）有限。小管出流可选用毛管管径主要De12、De16、De20和De25等4种,滴灌可选用毛管管径有De12、De16和De20等3种,因此拟采用枚举法确定最优管径。针对典型的小管出流灌溉系统或典型的滴灌系统,拟定灌水器流量（q）、毛管长度（L）和灌溉定额（W）和毛管管径（d）的各种可能的组合。然后分别计算投资成本（Cc）、运行成本（C0）及年化总成本费用（Ct）,并进行优选,最终得到不同可能组合条件下毛管的最优管径。优化方法原理如图1所示。考虑到小管出流多用水于果树,毛管布置在有一定坡度的坡地上的可能性较大,因此对于小管出流毛管优化分析,还考虑了各种可能的地面坡度。图1优化原理框图2.微灌毛管成本分析与目标函数（1）小管灌溉系统的布局小管出流灌溉一般用于果树灌溉,该系统包括泵送装置、过滤器、干管、支管、毛管和小管。干管从水源供水并将其输送到支管,支管将水输送到毛管和小管（灌水器）。小管通过稳流器连接到毛管,并将水灌入根区周围的渗透环沟。（2）毛管成本管道的完整成本是管道材料、长度和直径的函数。对于给定类型、给定管径的管道,管道的资本成本与仅其长度成正比,即:CP=LP 1式中,Cp为管道资本成本（$）;L为毛管长度（m）;P为管道价格（$/m）。（3）泵的成本加压水泵以及所有附件和安装费用的成本CP为其功率P的函数,可表示为Cp=KpPmp 2式中,Kp为系数;mp为指数;P为电机功率（kW）。电机功率P取决于泵的流量和扬程,计算公式为:P=ρgQh0/10000η 3式中,Q为泵的流量（m3/s）;h0为水泵扬程（m）;ρ为水的质量密度（g/cm3）;g为重力加速度（m/s2）;η为泵和电机单元的效率。（4）能耗成本灌溉系统的年度能源消耗取决于年度灌溉需求和抽水所需的功率。这个年度能源消耗可以通过将电动机功率乘以一年中水泵抽水天数（D）及平均每天工作小时（T）数来估算,计算式为:Aen=DTρgQh0/1000η 4年度运营成本需转换为现值:Cop=AenCen（A/P,i,n）5式中,Cop为年运营成本（$）;Aen为年能源需求（$）;Cen为能源价格（$/kW·h）;（A/p,i,n）为资本回收系数。即（A/P,i

关键词：微灌系统毛管设计压力补偿式滴头稳流器

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Cancer cells evade ferroptosis: sex hormone-driven membrane-bound O-acyltransferase domain-containing 1 and 2 (MBOAT1/2) expression

引用

Signal Transduction and Targeted Therapy 2023年第10期8卷 4424-4425页

作者： Alexia Belavgeni wulf Tonnus Andreas Linkermann Division of Nephrology Department of Internal Medicine IUniversity Hospital Carl Gustav Carus at the Technische Universitat DresdenDresdenGermany Division of Nephrology Department of MedicineAlbert Einstein College of MedicineBronxNYUSA

In a recent manuscript published in Cell,Liang et *** novel ferroptosis regulators,membrane-bound O-acyltransferase domain-containing 1 and 2(MBOAT1/2).1 These findings may have implications for ferroptosis-based canc... 详细信息

关键词： al. T1/2 Cancer

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

Soil organic matter amendments in date palm groves of the Middle Eastern and North African region:a mini-review

引用

Journal of Arid Land 2016年第1期8卷 77-92页

作者： Rawan MLIH Roland BOL wulf ame.ung Nadhem BRAHIM Institute of Bio-Geoscience Agrosphere Institute (IBG-3) Juelich Research Center Institute of Crop Science and Resource Conservation (INRES)/Soil Science and Soil Ecology University of Bonn Faculty of Sciences of Tunis Department of Geology University of Tunis El Manar

Countries in the Middle Eastern and North African (MENA) region are among the most water-scarce regions in the world, and their dryland soils are usually poor in organic carbon content (amendments beneath the soil surface as a key tool in land restoration. We conclude that soil organic matter amendments can be very successful in restoring soil water and preventing the soil from salinization.

关键词： review Middle Eastern and North African (MENA) drylands organic matter amendments oasis agrosystem date palm production

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

Immunological consequences of arsenic trioxide-induced necrosis

引用

Cellular & Molecular Immunology 2023年第3期20卷 308-309页

作者： Shubhangi Gavali wulf Tonnus Andreas Linkermann Division of Nephrology Department of Internal Medicine 3University Hospital Carl Gustav Carus at the Technische Universitat DresdenDresdenGermany Division of Nephrology Department of MedicineAlbert Einstein College of MedicineBronxNYUSA

The exact mechanism of arsenic trioxide (ATO, As_(2)O_(3)) poisoning has been a mystery for centuries. While rumors even suggest that it might have killed Napoleon, more recent work suggests ATO as a potential treatment option for acute promyelocytic leukemia [1]. While the potency of ATO in cell killing has been recognized, hardly anyone has considered the immunological consequences of cell death in tumors or tissues following ATO treatment. In this issue of Cellular and Molecular Immunology, Chen et al. address this question, adding yet another chapter to the complex relation between cell death and the immune response .

关键词： consequences death acute

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

Electrochemical characteristics of phosphorus doped Si-C composite for anode active material of lithium secondary batteries

引用

中国有色金属学会会刊：英文版 2009年第4期19卷 1018-1022页

作者： Jae-Hyun NOH Kwan-Yo ung LEE Joong-Kee LEE Battery Research Center Korea Institute of Science and Technology Department of Chemical and Biological Engineering Korea University

Phosphorus doped silicon-carbon composite particles were synthesized through a DC arc plasma ***(SiH4) and methane(CH4) were introduced into the reaction chamber as the precursor of silicon and carbon,***(PH3) was used as a phosphorus dopant *** of synthesized particles were carried out by scanning electron microscopy(SEM),X-ray diffractometry(XRD),X-ray photoelectron spectroscopy(XPS) and bulk resistivity *** properties were investigated by cyclic test and electrochemical voltage spectroscopy(EVS).In the experimental range,phosphorus doped silicon-carbon composite electrode exhibits enhanced cycle performance than intrinsic silicon and phosphorus doped *** can be explained that incorporation of carbon into silicon acts as a buffer matrix and phosphorus doping plays an important role to enhance the conductivity of the electrode,which leads to the improvement of the cycle performance of the cell.

关键词：电化学特性磷掺杂负极活性材料磷硅电池材料锂离子 X射线光电子能谱扫描电子显微镜

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

Measuring Tourist’s Water Footprint in a Mountain Destination of Northwest Yunnan, China

引用

Journal of Mountain Science 2011年第5期8卷 682-693页

作者： YANG Mingyu Luc HENS Robert DE wulf OU Xiaokun Institute of Ecology and Geobotany Yunnan University Kunming 650091 China Flemish Institute for Technological Research Mo12400 Belgium Department of Forest and Water Management Universiteit Gent Gent 9000 Belgium

Monitoring and minimizing tourist’s water consumption is essential for the sustainable development of mountain destinations in the world. However, available data and a generally accepted protocol on such measurement are still limited. This study uses water footprint accounting to quantify tourist’s water demand in the Liming valley, a World Heritage site and a rapidly growing tourism destination in Northwest Yunnan, China. Both the water for direct and indirect use is taken into account based on the consumptive behavior of the tourists in the valley. Data were collected through guesthouse monitoring and a tourist survey in the 2005 tourist season. The results indicate that an average tourist leaves behind a footprint of 5.2 m3 on local water resources per day. Food production and waste dilution are the two most important water consumption factors. The results also show tourists consume more water than the local residents on per capita basis. This suggests more commitment is necessary to cope with this stress by individual tourists. Management implications to make water use more sustainable in mountain destinations are derived from this study.

关键词： Tourism Mountain destination Water demand Footprint accounting Sustainable development Northwest Yunnan

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

Sketches toward a Theory of Every Thin/kin/g

引用

Journal of Philosophy Study 2013年第8期3卷 685-705页

作者： ame Kjellman Researcher Department of Computer and Systems Sciences Stockholm University and KTH Sweden

The status of the social and human sciences as genuine sciences on a par with the natural sciences has widely been held in doubt, and the subject-oriented approach （SOA） to knowledge also shows the traditional scientific view to be misleaded. Its shows that it is mandatory to dismiss the idea that personal knowledge is a representation of a common world created by some God, and also the mistake to take the seductive noun/verb structure as for given. We need a new methodological paradigm of science--an approach that avoids the pitfalls of dualism and realism--and take the effort to couch its thinking in a re-interpretation of natural language. This line of reasoning paves the way for the SOA--a new epistemology that takes the individual knower and its feelings as the coherent point of departure. The traits of a new foundation are sketched and to that end a bootstrap model is proposed that departs from the early man＇s first experience. In doing so, we, in a subject-oriented manner, can bring man＇s living experience and his priverse （or private universe）, under the collective umbrella of a consensual science. This approach brings the promise to provide a sound theory of everything-or rather a theory of every thin/kin/g-which in one step removes the cleft between the natural and social sciences.

关键词： semiosis knowledge experience communication convention scientific consensus monism

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

Carbon Dioxide Concentration and Flux in an Urban Residential Area in Seoul,Korea

引用

Advances in Atmospheric Sciences 2014年第5期31卷 1101-1112页

作者： Moon-Soo PARK Seung Jin JOO Soon-ung PARK Weather Information Service Engine Center for Atmospheric Science & Earthquake ResearchSeoul 121-835 Korea Center for Atmospheric and Environmental Modeling Seoul 152-775 Korea

The carbon dioxide （CO2） concentrations and fluxes measured at a height of 17.5 m above the ground by a sonic anemometer and an open-path gas analyzer at an urban residential site in Seoul, Korea from February 2011 to January 2012 were analyzed. The annual mean CO2 concentration was found to be 750 mg m-3, with a maximum monthly mean concentration of 827 mg m-3 in January and a minimum value of 679 mg m-3 in August. Meanwhile, the annual mean CO2 flux was found to be 0.45 mg m-2 s-1, with a maximum monthly mean flux of 0.91 mg m-2 s-1 in January and a minimum value of 0.19 mg m-2 s-1 in June. The hourly mean CO2 concentration was found to show a significant diurnal variation; a maximum at 0700-0900 LST and a minimum at 1400-1600 LST, with a large diurnal range in winter and a small one in summer, mainly caused by diurnal changes in mixing height, CO2 flux, and surface complexity. The hourly mean CO2 flux was also found to show a significant diurnal variation, but it showed two maxima at 0700-0900 LST and 2100-2400 LST, and two minima at 1100-1500 LST and 0300-0500 LST, mainly caused by a diurnal pattern in CO2 emissions and sinks from road traffic, domestic heating and cooking by liquefied natural gas use, and the different horizontal distribution of CO2 sources and sinks near the site. Differential advection with respect to wind direction was also found to be a cause of diurnal variations in both the CO2 concentration and flux.

关键词： CO2 concentration CO2 flux liquefied natural gas (LNG) Seoul urban residential area

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

Assessment of handheld mobile terrestrial laser scanning for estimating tree parameters

引用

Journal of Forestry Research 2021年第4期32卷 1503-1513页

作者： Cornelis Stal Jeff rey Verbeurgt Lars De Sloover Alain De wulf Center for Applied Data Science University College GhentValentin Vaerwyckweg 19000 GhentBelgium Department of Geography 3D Data Acquisition Research UnitGhent UniversityKrijgslaan 2819000 GhentBelgium Department of Geography CartoGIS Research UnitGhent UniversityKrijgslaan 2819000 GhentBelgium

Sustainable forest management heavily relies on the accurate estimation of tree *** others,the diameter at breast height(DBH) is important for extracting the volume and mass of an individual *** systematically estimating the volume of entire plots,airborne laser scanning(ALS) data are *** estimation model is frequently calibrated using manual DBH measurements or static terrestrial laser scans(STLS) of sample *** reliable,this method is time-consuming,which greatly hampers its ***,a handheld mobile terrestrial laser scanning(HMTLS) was demonstrated to be a useful alternative technique to precisely and efficiently calculate *** data acquisition techniques were applied at a sample plot,then the resulting parameters were comparatively *** calculated DBH values were comparable to the manual measurements for HMTLS,STLS,and ALS data *** the comparability of the extracted parameters,with a reduced point density of HTMLS compared to STLS data,and the reasonable increase of performance,with a reduction of acquisition time with a factor of5 compared to conventional STLS techniques and a factor of3 compared to manual measurements,HMTLS is considered a useful alternative technique.

关键词： Forest inventory DBH Airborne laser scanning Terrestrial laser scanning Handheld mobile laser scanning Point cloud processing

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：