检索结果-南通市图书馆

Viscoelasticity and shear resistance at the aggregate scale of structured and organic carbon-free Chernozems

Pedosphere 2023年第5期33卷 754-764页

作者： Christoph HAAS rainer horn Philipp SAGGAU rainer DUTTMANN Institute for Plant Nutrition and Soil Science University of KielKiel 24118Germany Department of Geography Division of Landscape Ecology and Geoinformation SciencesUniversity of KielKiel 24118Germany

Soil rheology characterises the flow behaviour of soils at the particle-particle to aggregate *** sweep tests(ASTs)are often the method of choice for parameterizing soil flow properties,such as the shear strain values at the end of the linear viscoelastic range(i.e.,the deformation is mainly elastic)and at the yield point(i.e.,elastic equals plastic deformation).Samples from seven soil profiles and five soil depths of Chernozems,collected in the Maidanetske study area,close to Uman City of Ukraine,were analysed to evaluate the effect of soil organic carbon(SOC)on the parameters related to soil microstructural stability derived from *** organic carbon was removed with H_(2)O_(2)to determine the soil texture-dependent values of soil rheological properties,which were compared to the values determined for samples with intact water-stable *** shear resistance-related parameters increased for aggregated soil samples compared to SOC-free soil samples,indicating an increase in soil stability due to *** contrast,the values of the overall viscoelasticity and the shear strain were reduced for aggregated soil samples,indicating decreased soil *** functions were applied to predict the shear strain-dependent loss and storage moduli and shear stress values as a function of SOC *** particles(630–2000μm)and volumetric water content improved the *** conclude that increased SOC content,through the gluing and cementing effects of SOC and altered aggregate shapes compared to SOC-free soil materials,contributes to higher microstructural ***,the increased water content in the SOC-containing soil samples reversed soil strengthening *** was due to the fact that a more rapid increase in positive water pressure under shear stress weakened the samples and the spherical aggregates began to rotate more easily,thus loosing energy,when compared to platy particles of the SOC-free soil materials.

关键词： aggregation rheology shear strain shear stress soil organic carbon depletion soil stability

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

Biochar-Induced Changes in Soil Resilience:Effects of Soil Texture and Biochar Dosage

引用

Pedosphere 2017年第2期27卷 236-247页

作者： Ayodele Ebenezer AJAYI rainer horn Department of Agricultural and Environmental Engineering Federal University of Technology 340252 Akure Ondo State (Nigeria) Institute for Plant Nutrition and Soil Science CAU Kiel 24118 Kiel (Germany)

Biochars are, amongst other available amendment materials, considered as an attractive tool in agriculture for carbon sequestration and improvement of soil functions. The latter is widely discussed as a consequence of improved physical quality of the amended ***, the mechanisms for this improvement are still poorly understood. This study investigated the effect of woodchip biochar amendment on micro-structural development, micro-and macro-structural stability, and resilience of two differently textured soils,fine sand(FS) and sandy loam(SL). Test substrates were prepared by adding 50 or 100 g kg^(-1) biochar to FS or SL. Total porosity and plant available water were significantly increased in both soils. Moreover, compressive strength of the aggregates was significantly decreased when biochar amount was doubled. Mechanical resilience of the aggregates at both micro-and macro-scale was improved in the biochar-amended soils, impacting the cohesion and compressive behavior. A combination of these effects will result in an improved pore structure and aeration. Consequently, the physicochemical environment for plants and microbes is improved. Furthermore, the improved stability properties will result in better capacity of the biochar-amended soil to recover from the myriad of mechanical stresses imposed under arable systems, including vehicle traffic, to the weight of overburden soil. However, it was noted that doubling the amendment rate did not in any case offer any remarkable additional improvement in these properties, suggesting a further need to investigate the optimal amendment rate.

关键词： aggregate stability amendment material compressive strength rheometry shear properties total porosity

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

Effect of land-use management systems on coupled physical and mechanical,chemical and biological soil processes:how can we maintain and predict soil properties and functions?

引用

Frontiers of Agricultural Science and Engineering 2020年第3期7卷 243-245页

作者： rainer horn Winfried E.H.BLUM Institute of Plant Nutrition and Soil Science 24118 KielGermany Institute of Soil Research University of Natural Resources and Life Sciences(BOKU)1190 ViennaAustria

Soil is one of the most critical life-supporting components of the biosphere. Soil provides many ecosystem services,such as a habitat for biodiversity, water and nutrients, food, feed, fiber and energy, but also serves as archaeologicalrepositories. In addition to natural changes in pedological properties and functions over the course of time (soilgenesis), their properties also undergo intense and irreversible changes due to a non-site adjusted landmanagement and improper application of machinery, sealing and techniques as well as chemical impacts includingacidity from acid rain, heavy metals pollution and salinity.

关键词： soil maintain sealing

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

Nutrient uptake,maximum yield production,and economic return of maize under deficit irrigation with biochar and inorganic fertiliser amendments

引用

Biochar 2019年第4期1卷 375-388页

作者： Oluwaseun Temitope Faloye Ayodele Ebenezer Ajayi Michael Olarewaju Alatise Babatunde Sunday Ewulo rainer horn Department of Agricultural and Environmental Engineering Federal University of TechnologyAkureNigeria Department of Agricultural and Food Engineering Afe Babalola UniversityAdo EkitiNigeria Department of Crop Soil and Pest ManagementFederal University of TechnologyAkureNigeria Institute for Plant Nutrition and Soil Science CAU KielHermann Rodewaldstr.224118 KielGermany

The individual and combined effects of biochar(B)and inorganic fertiliser(F)have all been widely proofed to improve soil fertility and enhance crop growth and yield under irrigation(I)and rain fed ***,the strength of their individual and combined effects on crop productivity has been scarcely *** addition,few studies have assessed their individual and co-application effects on economic ***,a 2-year field experiment which consisted of factorial combination of irrigation(I)[100%full irrigation(FI),80%FI and 60%FI],biochar(0 and 20 t/ha)and fertiliser(0 and 300 kg/ha)was *** to the results,irrigation was the dominant factor that influences maize grain yield,followed by inorganic fertiliser and biochar,and they were all significant in their main *** strength of interaction effects among,I,F and B on maize grain yield follow the sequence F×I>B×F>B×*** economic analysis showed that the ternary combination of B,F and I was more economical than the binary combination of B plus I,and F plus I(in that order),when compared with the standalone application of I at maximum production in the field *** addition,combined applications of biochar and fertiliser improved soil nutrients,nutrient uptake in all irrigation treatments,compared to the standalone applications of biochar or *** research is,therefore,recommended for long-term evaluation of the economic viability of integrating biochar with fertiliser under irrigation.

关键词： Biochar amendment Drip irrigation Maize grain yield Economic evaluation Optimum irrigation

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

Investigation of time dependent development of soil structure and formation of macropore networks as affected by various precrop species

引用

International Soil and Water Conservation Research 2014年第2期2卷 51-66页

作者： Sebastian K.Pagenkemper Daniel Uteau Puschmann Stephan Peth rainer horn Dept.of Soil Science Institute of Plant Nutrition and Soil ScienceUniversity of KielGermany Dept.of Soil Science Organic Agriculture SciencesUniversity of KasselGermany

A well developed macropore network is advantageous in terms of transport processes regarding gas and water,as well as nutrient acquisition and root growth of crops.X-ray computed tomography provides a non-destructive method to visualize and quantify three-dimensional pore *** and morphological parameters of the complex pore system such as connectivity,tortuosity,porosity and pore surface area would be very useful for modeling and simulation of transport and exchange processes by providing quantitative data on relevant soil structural features and their modification by soil *** scope of this study was to analyze and quantify the development of soil structure in the subsoil depending on three different precrop species(alfalfa A,chicory C and fescue F),at three depths(45,60 and 75 cm)and cultivation periods(1,2 and 3 years).Furthermore,morphological(air-filled porosityθa,pore surface area)and geometrical(pore diameter,connectivity,continuity,tortuosityτ)parameters were gathered with X-ray CT and image *** an experimental field trial(Germany)with a Haplic Luvisol as soil type samples were taken and ***-capacity(θa)was measured in the laboratory for the same cylinders and compared to the results derived by image ***-capacity was highest for alfalfa(3 years,75 cm).Tortuosity(τ)ranged between 1.3 and 4.38,while alfalfa(3 years)showed the highest value,which indicated structural development due to crack formation by enhanced root water ***,an increase in accessible surface may improve water and nutrient supply for plants,whereas the highτvalues may assume that oxygen supply is *** was found that the interaction of gas-diffusivity and the calculated parameters should be further investigated in terms of limitations to plant growth.

关键词： Biological tillage Image analysis Batch processing Subsoil structure Dynamic development

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

不同放牧强度下羊草和大针茅草原土壤含水量的空间变化

引用

生态环境学报 2015年第8期24卷 1274-1279页

作者：甘磊马蕊彭扬建彭新华莫春梦 rainer horn 桂林理工大学广西环境污染控制理论与技术重点实验室广西桂林541004 桂林理工大学广西岩溶地区水污染控制与用水安全保障协同创新中心广西桂林541004 土壤与农业可持续发展国家重点实验室中国科学院南京土壤研究所江苏南京210008 Institute of Plant Nutrition and Soil Science Christian-Albrechts-University zu Kiel

近年来不合理的放牧体制造成内蒙古地区土壤退化严重.基于内蒙古草原生态系统研究站建立围封（UG79）、冬季放牧（WG）、持续放牧（CG）和过度放牧（HG）条件下羊草（Leymus chinensis）和大针茅（Stipa grandis）草原试验区研究不同放... 详细信息

近年来不合理的放牧体制造成内蒙古地区土壤退化严重.基于内蒙古草原生态系统研究站建立围封（UG79）、冬季放牧（WG）、持续放牧（CG）和过度放牧（HG）条件下羊草（Leymus chinensis）和大针茅（Stipa grandis）草原试验区研究不同放牧强度和植被覆盖条件下土壤含水量的空间变化.试验共分为5 个小区,分布为：LUG79、LWG、LHG、SUG79 和SCG.试验利用GPS 在每个小区建立1 个长135 m,宽105 m,共计100 个测量点的空间区域,通过利用HH2 Moisture Meter测量土含水量并研究其空间变化情况.结果表明：降水是引起区域土壤含水量变化的主要因素,是引起土壤含水量空间变异的关键因子.在羊草区,LWG 土壤含水量（0.29-0.05 cm^3·cm^-3）高于LUG79（0.24-0.03 cm^3·cm^-3）,而LHG 由于过度放牧导致最小的土壤含水量（0.21-0.01 cm^3·cm^-3）.在大针茅区SCG 土壤含水量（0.28-0.07 cm^3·cm^-3）要大于SUG79 区（0.27-0.05cm^3·cm^-3）.相较于围封而言,SCG 和LWG 区在适度的持续放牧与冬季放牧方式下能增强土壤对水分的保持能力,说明适度的放牧强度能增加土壤含水量.在围封区域SUG79 区的土壤含水量高于LUG79 区的土壤含水量.从地统计分析结果看,每个试验区的土壤含水量空间分布均具有-定的稳定性,其空间结构比均高于97%.但两个围封的UG79 区土壤含水量空间分布比放牧的CG、WG 和HG 试验区更稳定,说明放牧对土壤含水量空间分布的稳定性有一定破坏作用.

关键词：放牧强度土壤含水量空间变化

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

Translocator protein and neurodegeneration: insights from Alzheimer’s disease

引用

Neural Regeneration Research 2025年第4期20卷 1090-1091页

作者： Arpit Kumar Pradhan rainer Rupprecht Gerhard Rammes Klinik für Anaesthesiologie und Intensivmedizin der Technischen Universität München Klinikum rechts der IsarMunichGermany Graduate School of Systemic Neurosciences Ludwig-Maximilians-Universität MünchenMartinsriedGermany Department of Psychiatry and Psychotherapy University RegensburgRegensburgGermany

The 18 kDa translocator protein(TSPO)located on the outer mitochondrial membrane regulates several key cellular processes including mitochondrial homeostasis,cholesterol transport,apoptosis,cell proliferation,and maintenance of mitochondrial health(Rupprecht et al.,2022,2023).TSPO is expressed in both peripheral organs and the central nervous system,with a more pronounced expression in tissues that produce *** main reason why TSPO has garnered so much attention is because it plays a key role in neurosteroidogenesis by transferring cholesterol from the outer to the inner mitochondrial membrane,which is the rate-limiting step in neurosteroid synthesis.A cholesterol-recognizing amino acid consensus domain has been identified in the cytosolic C terminus of the TSPO protein by both in vitro and site-directed mutagenesis experiments(Li et al.,2001).However,the role of TSPO in the process of neurosteroid synthesis has been challenged by several studies,particularly TSPO knockout models,which suggest that TSPO removal does not affect the phenotype or the system’s viability(Tu et al.,2014).However,ligands targeting TSPO have been shown to enhance levels of neurosteroids which suggests that neurosteroidogenesis is one of the major functional roles mediated by the TSPO protein.

关键词： cholesterol organs

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

放牧对内蒙古大针茅草原土壤剪切力空间分布的影响

引用

草业科学 2014年第2期31卷 219-223页

作者：甘磊彭新华谢永雄钟家尚 Stephan PETH rainer HORM 桂林理工大学广西矿冶与环境科学实验中心广西桂林541004 桂林理工大学环境科学与工程学院广西桂林541004 土壤与农业可持续发展国家重点实验室中国科学院南京土壤研究所江苏南京210008 Institute of Plant Nutrition and Soil Science Christian-Albrechts-University zu Kiel

本研究在内蒙古草原生态系统研究站的持续放牧(CG)和禁牧(UG79,从1979年开始禁牧)两个试验区。利用GPS在每个区分别设立1个长135m×105m的样地,每样地选100个测量点,利用Hand-held vane tester测量土壤剪切力并研究其空间分布情况。结... 详细信息

本研究在内蒙古草原生态系统研究站的持续放牧(CG)和禁牧(UG79,从1979年开始禁牧)两个试验区。利用GPS在每个区分别设立1个长135m×105m的样地,每样地选100个测量点,利用Hand-held vane tester测量土壤剪切力并研究其空间分布情况。结果表明,CG区,放牧导致土壤孔隙减少,容重增加,有机质减少,土壤剪切力高于凋落物与有机质较多的禁牧小区。在UG79和CG两个区,从干旱条件到中等水分条件,土壤剪切力空间分布都有差异,说明土壤含水量在一定程度上决定了土壤剪切力的空间分布,但到达湿润条件后,其分布有恢复原状的趋势,这暗示土壤水分对其影响也存在限制。

关键词：放牧土壤剪切力空间分布土壤水分

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

Friction between a temperature dependent viscoelastic body and a rough surface

引用

Friction 2016年第1期4卷 50-64页

作者： rainer HEISE Institute for Mechanics Technische Universit(a)t Berlin Straβe des 17.Juni 135 Berlin D-10623 Germany

In this study, we investigate the friction between a one-dimensional elastomer and a one-dimensional rigid randomly rough surface. Special emphasis is laid on the temperature dependence of the elastomer and its effect on the frictional behavior of the contact. The elastomer is modeled as a Kelvin body in a one-dimensional substitute model in the spirit of the method of dimensionality reduction. The randomly rough surface is a self-affine one-dimensional fractal. We provide a short discussion of a conical indenter pressed in a displacement controlled process into an elastomer. These analytical considerations are taken as a basis for the treatment of the randomly rough counter surface in contact to an elastomer with and without temperature dependent viscosity. We identify dimensionless quantities describing this process, introduce a thermal length scale, and give estimates for the coefficient of friction as function of velocity, indentation and thermal quantities.

关键词： elastomer friction temperature dependence coefficient of friction

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

Stochastic Differential Games with Reflection and Related Obstacle Problems for Isaacs Equations

引用

Acta Mathematicae Applicatae Sinica 2011年第4期27卷 647-678页

作者： rainer BUCKDAHN Département de Mathématiques Université de Bretagne Occidentale6avenue Victor-le-GorgeuB.P.80929285 Brest cedexFrance Institute for Advanced Study Shangdong UniversityJinan 250100China

In this paper we first investigate zero-sum two-player stochastic differential games with reflection, with the help of theory of Reflected Backward Stochastic Differential Equations （RBSDEs）. We will establish the dynamic programming principle for the upper and the lower value functions of this kind of stochastic differential games with reflection in a straightforward way. Then the upper and the lower value functions are proved to be the unique viscosity solutions to the associated upper and the lower Hamilton-Jacobi-Bettman-Isaacs equations with obstacles, respectively. The method differs significantly from those used for control problems with reflection, with new techniques developed of interest on its own. Further, we also prove a new estimate for RBSDEs being sharper than that in the paper of E1 Karoui, Kapoudjian, Pardoux, Peng and Quenez （1997）, which turns out to be very useful because it allows us to estimate the LP-distance of the solutions of two different RBSDEs by the p-th power of the distance of the initial values of the driving forward equations. We also show that the unique viscosity solution to the approximating Isaacs equation constructed by the penalization method converges to the viscosity solution of the Isaacs equation with obstacle.

关键词： stochastic differential games value function reflected backward stochastic differential equations,dynamic programming principle Isaacs equations with obstacles viscosity solution

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：