检索结果-南通市图书馆

Topographic differentiations of biological soil crusts and hydraulic properties in fixed sand dunes, Tengger Desert

Journal of Arid Land 2015年第2期7卷 205-215页

作者： Zhi Shan ZHANG Yong Le CHEN Bin Xing XU Lei HUANG Hui Juan TAN Xue Jun DONG Shapotou Desert research and Experiment Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province texas a&m Agri Life research and extension center at Uvalde

Biological soil crusts （BSCs） play an important role in surface soil hydrology. Soils dominated with moss BSCs may have higher infiltration rates than those dominated with cyanobacteria or algal BSCs. However, it is unnown whether improved infiltration in moss BSCs is accompanied by an increase in soil hydraulic conductivity or water retention capacity. We investigated this question in the Tengger Desert, where a 43-year-old revegetation program has promoted the formation of two distinct types of BSCs along topographic positions, i.e. the moss-dominated BSCs on the interdune land and windward slopes of the fixed sand dunes, and the al- gal-dominated BSCs on the crest and leeward slopes. Soil water retention capacity and hydraulic conductivity were measured using an indoor evaporation method and a field infiltration method. And the results were fitted to the van Genuchten-mualem model. Unsaturated hydraulic conductivities under greater water pressure （〈-0.01 mPa） and water retention capacities in the entire pressure head range were higher for both crust types than for bare sand. However, saturated and unsaturated hydraulic conductivities in the near-saturation range （〉-0.01 mPa） showed decreasing trends from bare sand to moss crusts and to algal crusts. Our data suggested that topographic differentiation of BSCs significantly affected not only soil water retention and hydraulic conductivities, but also the overall hydrology of the fixed sand dunes at a landscape scale, as seen in the reduction and spatial variability in deep soil water storage.

关键词： algal crusts hydraulic conductivity moss crusts soil water retention curve Tengger Desert

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

Genetic and epigenetic changes associated with cholangiocarcinoma:From DNA methylation to microRNAs

引用

World Journal of Gastroenterology 2007年第48期13卷 6465-6469页

作者： monique Stutes Steven Tran Sharon Demorrow Division of research and Education Scott and White Hospital Temple Texas Department of medicine Texas A&M Health Science Center College of Medicine Temple Texas

Cholangiocarcinomas are malignant epithelial liver tumors arising from the intra- and extra-hepatic bile ducts. Little is known about the molecular development of this disease, and very few effective treatment options are available. Thus, prognosis is poor. Genetic and epigenetic changes play an integral role in the neoplastic transformation of human cells to their malignant counterparts. This review summarizes some of the more prevalent genetic alterations （by microRNA expression） and epigenetic changes （hypermethylation of specific gene promoters） that are thought to contribute to the carcinogenic process in cholancliocarcinoma.

关键词： Promoter regions CpG islands Tumor suppressor Oncogene Inflammation

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

高度取向磷酸锆/环氧树脂纳米复合涂层的防腐蚀性能

引用

高分子材料科学与工程 2024年第4期40卷 72-78页

作者：雷凡冯民生李涛 Hung-Jue Sue 李姜成都大学机械工程学院四川成都610106 Polymer Technology center Department of Materials Science and EngineeringTexas A&M UniversityCollege StationTX 77843-3123USA 高分子材料工程国家重点实验室(四川大学)四川大学高分子研究所四川成都610065

针对金属防腐蚀的需求,采用简单的喷涂法在金属基底上制备了高度取向磷酸锆/环氧树脂纳米复合涂层。利用透射电镜和X射线衍射分析探究了复合涂层中磷酸锆纳米粒子的分散形貌,采用电化学交流阻抗谱和动电位极化曲线等测试评价了复合涂层... 详细信息

针对金属防腐蚀的需求,采用简单的喷涂法在金属基底上制备了高度取向磷酸锆/环氧树脂纳米复合涂层。利用透射电镜和X射线衍射分析探究了复合涂层中磷酸锆纳米粒子的分散形貌,采用电化学交流阻抗谱和动电位极化曲线等测试评价了复合涂层的防腐蚀性能和其作用机理。结果表明,高度取向的磷酸锆纳米粒子可有效地增加水、氧气、电解液的扩散路径,改善涂层的防腐蚀性能。此外,该绝缘涂层也可进一步阻止腐蚀介质的迁移,增加涂层电阻,显著提高环氧树脂涂层对金属基底的长期防护性能。

关键词：环氧树脂磷酸锆高度取向防腐蚀性能

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

Parental Selection in Rice Cultivar Improvement

引用

Rice science 2013年第1期20卷 45-51页

作者： Stanley Omar P B.SAmONTE Rodante E.TABIEN Lloyd T.WILSON Rice Experiment Station California Cooperative Rice Research FoundationInc.BiggsCA 95917USA texas a&m AgriLife research and extension center BeaumontTexas 77713USA

The evaluation of rice （Oryza safiva L.） cultivars assists breeders in identifying useful trait relationships and in selecting parents as donors of specific traits. This study was conducted to compare long-grain rice cultivars using genotype x trait （GT） biplot analysis and determine potential donors of traits related to grain yield and quality. Seventeen cultivars in the 2005 and 2006 Uniform Regional Rice Nursery in Beaumont, texas, USA were analyzed for 20 traits using GT biplot analysis. The GT biplots showed the diversity among cultivars with regards to yield-related traits. Cultivars recommended as donor parents were： Trenasse, Spring, Presidio, and Cocodrie for high grain yield and head rice rate Trenasse and Presidio for semi-dwarfness; Banks for tall plant height; Wells for high flag leaf area, panicle weight, and number and mass of filled grains per panicle; Hidalgo for high tiller density; Francis for high number of spikelets per panicle; Spring and Trenasse for short flowering duration; Cheniere for more days to heading and maturity and Spring for less days; and Spring and Hidalgo for high grain weiqht. Breeders can use these cultivars with specific traits to increase qrain yield and quality.

关键词： diversity genotype × trait biplot analysis grain yield grain quality parental selection rice

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

modeling mechanistic responses in asphalt pavements under three-dimensional tire-pavement contact pressure

引用

Journal of Central South University 2011年第1期18卷 250-258页

作者：胡小弟 L.F.WALUBITA texas Transportation Institute Texas A&M University SystemCollege StationTexas 77840-3135USA Transportation research center Wuhan Institute of TechnologyWuhan 430073China

A three dimensional finite element program incorporating actually measured vertical tire-pavement contact pressure(TPCP) was utilized for modeling the mechanistic responses in asphalt concrete(AC) layers by simulating various vehicle motions:stationary and non-stationary(*** acceleration or deceleration mode).Analysis of the results indicated the following items.1) It is critical to use the vertical TPCP as the design control criteria for the tensile strains at the bottom of the AC layer when the base layer modulus is lower in magnitude(e.g.≤400 mPa);however,when the base layer modulus is higher in magnitude(e.g.≥7 000 mPa),the horizontal TPCP and the tensile strains in the X-direction at the surface of the AC layer should also be considered as part of the design response criteria.2) The definition of "overload" needs to be revised to include tire pressure over-inflation,i.e.,a vehicle should be considered to be overloaded if the wheel load exceeds the specification and/or the tire inflation pressure is higher than the specification.3) Light trucks have more structural impact on the strain responses and pavement design when the thickness of the surfacing AC layer is thinner(e.g.≤50 mm).4) The acceleration of a vehicle does not significantly impact the AC surface distresses such as rutting at the top of the upgrade slopes or intersections;however,vehicle deceleration can dramatically induce horizontal shear strains and consequently,aggravate shoving and rutting problems at the highway ***,these factors should be taken into account during mechanistic stress-strain modeling and structural design of asphalt pavements.

关键词： asphalt pavement tire-pavement contact pressure vehicle acceleration mechanistic response three-dimensional finiteelement

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

Process integration of Calcium Looping with industrial plants formonetizing CO_(2) into value-added products

引用

Carbon Resources Conversion 2018年第2期1卷 191-199页

作者： Pooja Tilak mahmoud m.El-Halwagi Department of Chemical Engineering Texas A&M UniversityCollege StationTX 77843USA Gas and Fuels research center Texas A&M Engineering Experiment StationCollege StationTX 77843USA

A Calcium Looping Process(CLP)is an emerging approach for Carbon Capture and Utilization(CCU).It is essentially a CO_(2) capture process that utilizes calcium oxide(CaO)as a sorbent for the removal of CO_(2).A concentrated stream of CO_(2)(96%)that is suitable for storage and reuse is produced in this *** objective of this work is to use mass and energy integration to couple CLP with industrial facilities and power plants in order to enhance industrial symbiosis and reduce cost via the chemical conversion of CO_(2) into value-added *** attention is given to plants that generate large amount of CO_(2) and/or provide excess heat that can be used in driving CLP.A case study is solved to assess the integration of CLP with candidate processes including power plants,cement production,gas-to-liquid(GTL)facility,and chemical plants for the production of ammonia,urea,polymer,methanol and acetic *** solution to the case study shows the merits integrating CLP with processing facilities.

关键词： integration value utilize

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

OKRA (HIBISCUS ESCULENTUS) AND FENUGREEK (TRIGONELLA FOENUm GRACEUm) mUCILAGE:CHARACTERIZATION AND APPLICATION AS FLOCCULANTS FOR TEXTILE EFFLUENT TREATmENTS

引用

Chinese Journal of Polymer Science 2008年第6期26卷 679-687页

作者： Rajani Srinivasan Anuradha mishra Blackland research and extension Centre Texas A&M University System720East Blackland RoadTempleTX76502USA Department of Chemistry University Institute of Engineering and TechnologyCSJM UniversityKanpur-208 024India

The use of new food grade polysaccharides (mucilage) obtained from Hibiscus esculentus and Trigonella foenum graceum,commonly called Okra and Fenugreek,respectively,as flocculants was *** polysaccharides were used for removal of solids (suspended solids (SS) and total dissolved solids (TDS)) and dyes from real textile effluents and aqueous solutions of different class of synthetic *** of varying polysaccharide concentration,contact time and pH on removal of pollutant from the textile...

关键词： Fenugreek Okra Natural polysaccharides Flocculation Wastewater treatment Textile effluent Bridging Hibiscus esculentus Trigonella foenum graceum.

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

Survival of boll weevil （Coleoptera： Curculionidae） adults after feeding on pollens from various sources

引用

Insect Science 2007年第6期14卷 503-510页

作者： SHOIL m. GREENBERG GRETCHEN D. JONES FRANK EISCHEN RANDY J. COLEmAN JOHN J. ADAmCZYK, JR. TONG-XIAN LIU mAmOUDOU SETAmOU USDA-ARS KSARC-BIRU Weslaco USDA-ARS APmRU College Station USDA-ARS KSARC-Honey Bee Research Unit Department of Entomology Texas AgriLife Research Texas A&M University System texas a&m University Kingsville Citrus center Weslaco Texas USA

The survival of overwintering boll weevil, Anthonomus grandis grandis （Boheman）, adults on non-cotton hosts in the Lower Rio Grande Valley （LRGV） of texas was examined from 2001 to 2006. The success of the Boll Weevil Eradication Program, which was reintroduced into the LRGV in 2005, depends on controlling overwintering boll weevil populations. Laboratory studies were conducted using boll weevil adults that were captured in pheromone traps from September through march. The number of adults captured per trap declined significantly in the field from fall to the beginning of spring （3.5-7.0-fold）. The proportion of trapped males and females did not differ significantly. The mean weight of boll weevil adults captured in September was 13.3 mg, while those of captured adults from November to February were significantly lower and ranged from 6.7 to 7.8 mg. Our results show that boll weevil adults can feed on different plant pollens. The highest longevity occurred when adults were fed almond pollen or mixed pollens （72.6 days and 69.2 days, respectively） and the lowest when they fed on citrus pollen or a non-food source （9.7 days or 7.4 days, respectively）. The highest adult survival occurred on almond and mixed pollens [88.0%-97. 6% after 1st feeding period （10 days）, 78.0%-90.8% after 3rd feeding period （10 days）, 55. 0%-83.6% after 5th feeding period （10 days）, and 15.2%-32.4% after lOth feeding period （10 days）]. The lowest adult survival occurred on citrus pollen [52.0%-56.0% after 1st feeding period （10 days）, 13.3% after 3rd and 5th feeding periods （10 days）, and 0 after 6th feeding period （10 days）]. Pollen feeding is not a behavior restricted to adult boll weevils of a specific sex or physiological state. Understanding how boll weevil adults survive in the absence of cotton is important to ensure ultimate success of eradicating this pest in the subtropics.

关键词： boll weevil Anthonomus grandis grandis Curculionidae subtropics pollen

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

Benzene removal by nano magnetic particles under continuous condition from aqueous solutions

引用

Frontiers of Environmental Science & Engineering 2014年第3期8卷 345-356页

作者： mohammad mehdi Amin Bijan Bina Amir masoud Samani majd Hamidreza Pourzamani Environment research center lsfahan University of Medical Sciences Isfahan *** Iran BAEN Department Texas A&M University TX 77843 USA

Benzene removal evaluated using Fe304 nano continuous condition. A 44 initial benzene concentration, from aqueous solutions was magnetic particles （Nm） in factorial design including Nm dose, contact time and pH was investigated in 16 experiments （Taguchi OA design）. The results indicated that all factors were significant and the optimum condition was： pH 8, Nm dose of 2000 mg.L-1, benzene concentrations of 100 mg.L-1 and contact time of 14min. The maximum benzene uptake and distribution ratio in the optimum situation were 49.4mg.g-1 and 38.4L.g-1, respectively. The nano particles were shown to capture 98.7% of the benzene in optimum batch condition and 94.5% in continuous condition. The isotherm data proved that the Bmnauer-Emmett-Teller model fit more closely and produced an isotherm constant （b） less than one, indicating favorable adsorption. Regeneration studies verified that the benzene adsorbed by the Nm could be easily desorbed by temperature, and thereby, Nm can be employed repeatedly in water and wastewater management.

关键词： benzene experimental design Fe304 continues condition thermal recycling

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

modular next generation fast-neutron detector for portal monitoring

引用

Nuclear Science and Techniques 2022年第1期33卷 140-148页

作者： E.Aboud S.Ahn G.V.Rogachev V.E.Johnson J.Bishop G.Christian E.Koshchiy C.E.Parker D.P.Scriven Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA Department of Physics and Astronomy Texas A&M UniversityCollege StationTX 77843USA Department of Statistics Texas A&M UniversityCollege StationTX 77843USA

Nuclear nonproliferation is of critical importance for global *** fissile materials including highly enriched uranium and weapons-grade plutonium are especially important to *** interrogation techniques may result in much better sensitivity but are difficult with conventional portal monitors that rely on detecting thermal ***,most conventional portal monitoring systems rely on ^(3)He,which has a finite and continually decreasing *** designing a highly segmented array of organic scintillators,we posit that we can accurately and quickly identify fissile materials,including weapons-grade plutonium and highly enriched uranium,being *** propose a new design for a fast-neutron detector that overcomes the limitations of the current generation of portal ***6 simulations have been performed in conjunction with the UmPBT statistical model to determine the sensitivity limitations of the proposed *** suggest that the proposed detector may be 10 times more efficient than current-generation thermal neutron detectors and may be able to positively identify a 81 mg 235U source in as little as 192 seconds utilizing active interrogation techniques.

关键词： Fast-neutron detection Portal monitoring Nonproliferation

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：