检索结果-南通市图书馆

Effects of Hydrogels on Tree Seedling Performance in Temperate Soils before and after Water Stress

journal of Environmental Protection 2013年第7期4卷 713-721页

作者： lawrence j. B. Orikiriza Hillary Agaba Gerald Eilu john D. Kabasa Martin Worbes Aloys Hüttermann Department for Crop Sciences Institute of Tropical Agriculture University of Goettingen Goettingen Germany Department of Biosecurity Ecosystems and Veterinary Public Health Makerere University Kampala Uganda Faculty of Forest Sciences and Forest Ecology University of Goettingen Goettingen Germany National Forestry Re- sources Research Institute Kampala Uganda School of Forestry Environmental and Geographical Sciences Makerere University Kampala Uganda

Super Absorbent Polyacrylate (SAP) hydrogels absorb and store water thereby aiding plant establishment when incurporated in the soil. The effect of cross-linked SAP hydrogel amendment on the performance of tree seedlings of Picea abies, Pinus sylivestris and Fagus sylvatica grown in temperate soils under water stress and non-water stress periods was investigated in a green house. The objective was to compare the root and shoot biomass of seedlings of the three species grown in sand, loam and clay soils amended with 0.4% w/w hydrogel in non water stress conditions as well as survival, root and shoot biomass after subjection to water stress. The seedlings were grown for 16 weeks, harvested and shoot as well as root biomass determined before water stress. The seedlings were also subjected to water stress and their biomass assessed at death following the water stress. The results showed that root and shoot biomass were generally higher in hydrogel amended soils compared to the controls. Root and shoot biomass of Fagus sylvatica was lower compared to Picea abies and Pinus sylivestris before water stress. The 0.4% hydrogel amendment significantly increased species’ survival in the different soils studied. Although root biomass was higher in hydrogel amended sandy soil compared to other soils, P. sylivestris and F. sylvatica shoot biomass were higher in hydrogel amended clay and loam soils compared to the sandy soil after water stress. Biomass was higher in sand compared to loam and clay soils under non-water and water stressed conditions. Since SAP hydrogel amendment improved the survival and biomass production of tree seedlings before and after water stress, use of SAPs could be promoted to enhance seedling production in water stress and non-water stress environments.

关键词： Desiccation Non-Water Stress SAPs Soil Amendment Tree Species

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

什么材料可以做敷料?

引用

医疗卫生装备 1983年第1期 31-38页

作者： j.C.lawrence 陈惠孙

创伤敷料具有悠久的历史。公元前1,500—1,600年古埃及的文字上叙述过许多可作为敷料的原材料,其中包括涂有油脂的绷带(Bryan 1930;Ebell,1937),这种敷料被认为是润肤细布(tullegras)的前身,润肤细布就是 Lumiere 在第一次世界大战时介... 详细信息

创伤敷料具有悠久的历史。公元前1,500—1,600年古埃及的文字上叙述过许多可作为敷料的原材料,其中包括涂有油脂的绷带(Bryan 1930;Ebell,1937),这种敷料被认为是润肤细布(tullegras)的前身,润肤细布就是 Lumiere 在第一次世界大战时介绍的那种致密网眼棉纱浸以液体石腊的敷料(Harkins,1942)。此后,使用过许多种织物,包

关键词：敷料抗菌药物实验性小伤口医药卫生材料伤面渗出液

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

运动和疾病中的肠液体吸收

引用

体育科学 2001年第2期21卷 89-91页

作者：兰光史小才 Carl Gisoifi Ronald Maughan lawrence Schiller Leo Heitlinger j. Mare Rhoads Raul A. Wapnir Ph. D.Department of Exercise Science University of Iowa Ph. D. Department of Environment/Occupational Medicine University of Aberdeen M. D.Department of Internal MedicineBaylor University Waco M. D.Department of Pediatrics Ohio State University Columbus M. D.Department of Pediatrics University of North Carolina Chapel Hill Ph. D.Department of Pediatrics Cornell University Medical Collge

20世纪50年代以来，人们发现肠里葡萄糖的存在促进钠的转运（Riklis & Quastrel,1958）,这个里程碑式的发现引发口服补水溶液配方的产生。为满足水、耕作碳水化合物和电解质最大限度的吸收，精确配制这些溶液的问题激起了相当多的科学... 详细信息

20世纪50年代以来，人们发现肠里葡萄糖的存在促进钠的转运（Riklis & Quastrel,1958）,这个里程碑式的发现引发口服补水溶液配方的产生。为满足水、耕作碳水化合物和电解质最大限度的吸收，精确配制这些溶液的问题激起了相当多的科学研究和讨论。

关键词：运动疾病肠液体吸收口服补水溶液渗透压吸收能力纳碳水化合物

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

用于交流电机的新型F级热压固化主绝缘系统

引用

绝缘材料 1987年第4期 40-42页

作者： Robert j. lawrence 陈耀仁

为提高交流电动机及发电机的效率与出力,绝缘系统必须有承受高场强及高运行温度的能力。为了获得这样的性能,新型B阶段环氧树脂的热压固化多胶粉云母带的研制,必须提出几个关键的要点。

关键词：绝缘系统场强交流电动机发电机线棒交流电机损耗因数电器绝缘主绝缘

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

酒精滥用与成瘾中枢神经递质的研究进展

引用

中国药物依赖性杂志 2007年第1期16卷 5-12页

作者：陈锋 Andrew j lawrence 梁建辉 Melbourne大学Howard Florey研究所北京大学中国药物依赖性研究所北京100083

酒精滥用及其成瘾是一种失控且紊乱的饮酒行为，被定义为一种病理状态行为综合征。酒精成瘾患者除了机体出现对酒精产生耐受，中断饮酒后出现戒断症状以及各种并发症外，还突出表现为强迫性觅酒行为，对酒的强烈渴求（craving）和对酒... 详细信息

酒精滥用及其成瘾是一种失控且紊乱的饮酒行为，被定义为一种病理状态行为综合征。酒精成瘾患者除了机体出现对酒精产生耐受，中断饮酒后出现戒断症状以及各种并发症外，还突出表现为强迫性觅酒行为，对酒的强烈渴求（craving）和对酒的反复滥用，并且这些行为特征即使在断酒数年后也可能再次出现。

关键词：酒精滥用酒精成瘾中枢神经递质饮酒行为病理状态戒断症状行为特征综合征

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

游戏力养育

引用

作者： (美)劳伦斯·科恩(lawrence j. Cohen)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Essentials of accounting

Essentials of accounting

引用

2001年

作者： j. David Spiceland james F. Sepe lawrence A. Tomassini.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Intermediate Accounting 2nd ed. 2nd ed.

Intermediate Accounting 2nd ed.

引用

2001年

作者： j. David Spiceland james F.Sepe lawrence A.Tomassini

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Spontaneous Imbibition of Water and Determination of Effective Contact Angles in the Eagle Ford Shale Formation Using Neutron Imaging

引用

journal of Earth Science 2017年第5期28卷 874-887页

作者： Victoria H.DiStefano Michael C.Cheshire joanna McFarlane Lindsay M.Kolbus Richard E.Hale Edmund Perfect Hassina Z.Bilheux Louis j.Santodonato Daniel S.Hussey David L.jacobson jacob M.LaManna Philip R.Bingham Vitaliy Starchenko lawrence M.Anovitz Physical Sciences Directorate Chemical Sciences Division Oak Ridge National Laboratory Bredesen Center University of Tennessee Energy & Environmental Sciences Directorate Energy & Transportation Sciences Division Oak Ridge National Laboratory Neutron Sciences Directorate Chemical and Engineering Materials Division Oak Ridge National Laboratory Nuclear Science & Engineering Directorate Reactor & Nuclear Systems Division Oak Ridge National Laboratory Department of Earth and Planetary Science University of Tennessee Neutron Sciences Directorate Instrument and Source Division Oak Ridge National Laboratory Physical Measurement Laboratory National Institute of Standards and Technology Energy & Environmental Sciences Directorate Electrical & Electronics Systems Research DivisionOak Ridge National Laboratory

Understanding of fundamental processes and prediction of optimal parameters during the horizontal drilling and hydraulic fracturing process results in economically effective improvement of oil and natural gas extraction. Although modern analytical and computational models can capture fracture growth, there is a lack of experimental data on spontaneous imbibition and wettability in oil and gas reservoirs for the validation of further model development. In this work, we used neutron im- aging to measure the spontaneous imbibition of water into fractures of Eagle Ford shale with known geometries and fracture orientations. An analytical solution for a set of nonlinear second-order diffe- rential equations was applied to the measured imbibition data to determine effective contact angles. The analytical solution fit the measured imbibition data reasonably well and determined effective con- tact angles that were slightly higher than static contact angles due to effects of in-situ changes in veloci- ty, surface roughness, and heterogeneity of mineral surfaces on the fracture surface. Additionally, small fracture widths may have retarded imbibition and affected model fits, which suggests that aver- age fracture widths are not satisfactory for modeling imbibition in natural systems.

关键词： spontaneous imbibition effective contact angle neutron imaging Eagle Ford shale rock fractures.

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

Hydrogel amendment to sandy soil reduces irrigation frequency and improves the biomass of Agrostis stolonifera

引用

Agricultural Sciences 2011年第4期2卷 544-550页

作者： Hillary Agaba lawrence j. B. Orikiriza joseph Obua john. D. Kabasa Martin Worbes Aloys Hüttermann 不详

Soil water potential indicates the water status of the soil and the need for irrigation. The effect of hydrogel amendment to the upper sand soil layer on water infiltration into the lower un-amended sand layer, irrigation frequency, water use efficiency and biomass production of Agrostis stolonifera was investigated. The upper 25 cm sand layer in three identical buckets was amended at 0.4%, 0.2% and a control (no hydrogel) while the lower 25 cm sand layer separated from the upper layer by a wire mesh in the same buckets was un-amended. Agrostis stolonifera seeds were sown in each bucket and adequately irrigated using a hand sprayer. Potential meter electrodes were inserted at three random positions in each of the buckets and subsequent irrigations were done when a pressure of 600 bars was recorded in any of the three treatments. Data were collected on irrigation frequency, water content in the lower layer, water use efficiency and biomass production of Agrostis stolonifera. The mean water potential in the lower 25 cm layer un-amended sand was significantly more negative in the 0.4% hydrogel than in the control. More water content (10%) was recorded in the lower layer under the control bucket than in either the 0.2% and 0.4% hydrogel amended buckets. The frequency of irrigation was three-fold in the control compared to the 0.4% hydrogel amended sand. The hydrogel amended sand significantly increased the shoot and root biomass of Agrostis stolonifera by 2.2 and 4 times respectively compared to the control. The 0.4% hydrogel amendment in sand increased the water use efficiency of grass eight fold with respect to the control. The hydrogel stimulated development of a dense root network and root aggregation that increased contact of the roots with moisture thus improving water use efficiency of hydrogel amended soil. The results suggest that hydrogels can improve sandy soil properties for plant growth by absorbing and keeping water longer in the soil matrix thus reducing

关键词： Sand Water Use Efficiency Hydrogel Irrigation Biomass Agrostis Stolonifera

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

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

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

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：