检索结果-南通市图书馆

Spatial Variability of Micronutrients in Rice Grain and Paddy Soil

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

Pedosphere 2009年第6期19卷 748-755页

作者： WANG Lin, WU Jia-Ping 2 , LIU Yan-Xuan, HUANG Hui-Qing and FANG Qian-Fang College of Environment and Natural resources, zhejiang University, Hangzhou 310029 (China) College of Environment and Natural resources Zhejiang University Hangzhou 310029 (China)

Consumption of rice is the main source of micronutrients to human in Asia. A paddy field with unknown anthro- pogenic contamination in Deqing County, zhejiang province, China was selected to characterize the spatial variability and distribution of micronutrients in rice grain and soil. A total of 96 paired soil and rice grain samples were collected at harvest. The micronutrients in the soil samples were extracted by diethylenetriamine pentaacetic acid （DTPA）. The mean micronutrient concentrations in rice grain were 3.85 μg Cu g^-1, 11.6 μg Fe g^-1, 39.7 μg Mn g^-1 and 26.0 μg Zn g^-1 The mean concentrations were 2.54μg g^-1 for DTPA-Cu, 133.5μg g^-1 for DTPA-Fe, 30.6μg g^-1 for DTPA-Mn, and 0.84μg g^-1 for DTPA-Zn. Semivariograms showed that measured micronutrients in rice grain were moderately dependent, with a range distance of about 110 m. The concentrations of the DTPA-extractable micronutrients all displayed strong spatial dependency, with a range distance of about 60 m. There was some resemblance of spatial structure between soil pH and the grain Cu, Fe, Mn, and Zn. By analogy, similar spatial variation was observed between soil organic matter （SOM） and DTPA-extractable table micronutrients in the soil. Kriging estimated maps of the attributes showed the spatial distributions of the variables in the field, which is beneficial for better understanding the spatial variation of micronutrients and for potentially refining agricultural management practices at a field scale.

关键词： correlation dependency kriging soil properties

STUDY OF THE ECONOMIC TYPE OF SRPINKLING AND DRIP IRRIGATION

在线全文

学校读者我要写书评

暂无评论

STUDY OF THE ECONOMIC TYPE OF SRPINKLING AND DRIP IRRIGATION

Different sperm sources and parameters can influence intracytoplasmic sperm injection outcomes before embryo implantation

第19届国际灌排大会

作者： Yi Yongqing Professor and Senior Engineer water resources bureau of Yuyao Municiaplity Zip code: 315400

＜正＞The Yuayo municipality, located in the northeastern zhejiang province, has per capita water resources of 1300 m3 and 430 m3 per capita in the north plain. Since 2001, the economic type of sprinkler and drip system have been studied in this municipality. There have been many innovations on the sprinkler and drip techniques. They included replacing steel pipe with PE pipe, use river network for substituting the main pipe, replace pumping station with movable pumping set as well as to adopt small scale irrigation area, and fixed main pipe and movable branch and laterals. All these have reduced the cost to 917 USD/ha, only half of the cost of conventional system. The economic type of sprinkler and drip have been used for irrigation of bamboo shoots, pear tree, grape, water melon, vegetable and flower, etc. The benefitted land amounted to 874 ha in the end of 2004. The income has increased by 774 USD/ha. This technique has also been used for lowering temperature of the chicken and rabbit farms that was welcomed by the farmers. The political measures for promoting sprinkler and drip were adopted on 3 aspects : the government organizes water resources engineers to carry outtechnical study, demonstration and extension;Government subsidizes farmers with 45% of project cost;and Government encourages enterprizes to produce water-saving irrigation products.

关键词： Economic type sprikling drip benefit.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第1期13卷 1-10页

作者： Yue-hong LU1,2, Hui-juan GAO1, Bai-jia LI1, Ying-ming ZHENG1, Ying-hui YE1, Yu-li QIAN1, Chen-ming XU1, He-feng HUANG1, Fan JIN1 (1Department of Reproductive Endocrinology, Key Laboratory of Reproductive Genetics, Ministry of Education, and Key Laboratory of Women’s Reproductive Health of zhejiang province, Women’s Hospital, School of Medicine, zhejiang University, Hangzhou 310006, China) (2Department of Reproductive Health, shaoxing Women and Children Hospital, shaoxing 312000, China) Department of Reproductive Endocrinology Key Laboratory of Reproductive Genetics Ministry of Education Women's Hospital School of Medicine Zhejiang University Hangzhou 310006 China.

To evaluate the effects of sperm with different parameters and sources on the outcomes of intracytoplasmic sperm injection (ICSI), 1972 ICSI cycles were analyzed retrospectively. Groups 1 to 5 were composed of cycles using ejaculated sperm and were grouped according to sperm quantity, quality, and morphology into normal (288 cycles), or mild (329 cycles), moderate (522 cycles), severe (332 cycles), and extremely severe (171 cycles) oligozoospermia and/or asthenozoospermia and/or teratozoospermia (OAT) groups. Group 6 was composed of 250 cycles using testicular or epididymal sperm, and Group 7 consisted of 80 cycles using frozen-thawed sperm. We found that fertilization rates were gradually reduced from Groups 1 to 6, and reached statistical difference in Groups 5 and 6 (P0.05). A total of nine cases of malformation were observed, with a malformation rate of 1.25% (9/719). In conclusion, different sperm sources and parameters can affect ICSI outcomes before embryo implantation. A full assessment of offspring mal-formation will require further study using a larger sample size.

关键词： Intracytoplasmic sperm injection (ICSI)i Sperm Sperm source Sperm parameters Malformation

zhejiang Embracing Growth and Investmexnts

在线全文

学校读者我要写书评

暂无评论

中国经贸画报 1999年第5期 92-93页

作者： Lu Zushan Acting Vice Governor of zhejiang province

zhejiang province is located on thesoutheast Coast of China,and neighborsShanghai,China’s economic *** is a developed coastal region *** has convenient transportation andtelecommunications *** boasts richmarine resou... 详细信息

关键词： than more In US zhejiang Embracing Growth and Investmexnts

Pneumatically Actuated Soft Robotic Arm for Adaptable Grasping

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2018年第5期31卷 608-622页

作者： Zhe Chen Xueya Liang Tonghao Wu Tenghao Yin Yuhai Xiang shaoxing Qu State Key Laboratory of Fluid Power and Mechatronic System 38 Zheda Road Hangzhou 310027 China Key Laboratory of Soft Machines and Smart Devices of zhejiang province 38 Zheda Road Hangzhou 310027 China Department of Engineering Mechanics Zhejiang University 38 Zheda Road Hangzhou 310027 China

Developing robotic manipulators capable of performing effective physical interac- tion tasks is a challenging topic. In this study, we design a soft robotic arm （SRA） with multiple degrees of freedom inspired by the flexible structures and the unique motion mechanism of the octopus arm. The SRA is fabricated with elastomeric materials, which consists of four series of integrated pneumatic chambers that play similar roles as the muscles in the octopus arm can achieve large bending in various directions with variable stiffness. This SRA displays specified movements via controlling pressure and selecting channels. Moreover, utilizing parallel control, the SRA demonstrates complicated three-dimensional motions. The force response and motion of the SRA are determined both experimentally and computationally. The applications of the present SRA include tightly coiling around the objects because of its large bending deformation （nearly 360°）, grasping multiple objects, and adjusting the grabbing mode in accordance with the shape of objects.

关键词： Soft robotic arm Elastomeric materials Soft manipulation Variable stiffness actuation

Commelina communis L.: Copper Hyperaccumulator Found in Anhui province of China

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

Pedosphere 1997年第3期7卷 207-210页

作者： TANG SHIRONG HUANG CHANGYONG and ZHU ZUXIANG (Department of Soil Science, College of Environmental Sciences and Natural resources, zhejiang Agricultural University, Hangzhou 310029 China) Department of Soil Science College of Environmental Sciences and Natural Resources Zhejiang Agricultural University Hangzhou 310029 China

Commelina communis L. growing over some new copper mining wastelands at Bijiashan, Tongling City of Anhui province, China, was found to be a copper hyperaccumulator. Its copper concentrations were 2707-6159 (4439±2434) mg kg-1, 369-831 (731±142) mg kg-1, and 429-587 (547±57) mg kg-1, respectively, in the roots, stems, and leaves. The soils supporting the growth of the species had a copper concentration ranging from 4620 to 5020 mg kg-1 and averaging 4835±262 mg kg-1, suggesting that the species could not only grow on heavily copper-contaminated soils but also accumulate extraordinarily high concentration of copper. Thus, it shows great potential in the phytoremediation of copper-contaminated soils,the restoration of mined land, geochemical prospecting, and the study of environmental pollution changes.

关键词： Anhui province Commelina communis L. copper hyperaccumulator

在线全文

学校读者我要写书评

暂无评论

三峡库区生态补偿机制研究

水电能源科学 2011年第12期29卷 108-110,199页

作者：蔡光东董丛书浙江省瑞安市水利局浙江瑞安325200

针对三峡库区存在的生态环境问题,论述了建立生态补偿机制的必要性,初步建立了三峡库区生态补偿机制的基本框架,分析和探讨了三峡库区生态补偿的主体、客体、标准、方式、资金渠道等要素,并提出了三峡库区实施生态补偿机制的具体建议。

关键词：三峡库区生态补偿补偿要素三峡工程

Effect of Organic Acids and Protons on Release of Non-Exchangeable NH_4^+ in Flooded Paddy Soils

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2005年第3期15卷 273-280页

作者： ZHANGYong-Song shaoxing-Hua LINXian-Yong H.W.SCHERER MinistryofEducationKeyLabofEnvronmentalRemediationandEcosystemHealth CollegeofNaturalResourcesandEnvironmentalScienceZhejiangUniversityHangzhou31002g（China） InstituteofPlantNutrition JniversityofBonnKarlrobert-Kreiten-Str13D-53115Bonn（Germany）

In a model experiment, which imitated the rhizosphere of rice, the effect of organic acids (oxalic acid, citric acid) and protons on the release of non-exchangeable NH4+ and the resin adsorption of N was studied in a paddy soil, typical for zhejiang province, China. Oxalic and citric acids under low pH conditions, in combination with proton secretion, favored the mobilization of NH4+ ions and increased resin adsorption of N. The release of non-exchangeable NH4+ was associated with less formation of iron oxides. These could coat clay minerals and thus hinder the diffusion of NH4+ ions out of the interlayer. Protons enhanced the release of NH4+, and then they could enter the wedge zones of the clay minerals and displace non-exchangeable NH4+ ions.

关键词： ammonium release exchange resin non-exchangeable ammonium paddy soil root exudates

在线全文

学校读者我要写书评

暂无评论

杭州湾核电站选址的地球物理调查

物探与化探 1986年第3期12卷 161-170页

作者：梁乃杰浙江省地质矿产局

本文主要介绍杭州湾北岸三个拟建的核电站选址的地球物理调查工作概况。文中重点归纳了核电站选址三阶段中地球物理任务及解决的主要问题,介绍了利用综合地球物理方法在解决与核电站选址有关的区域和深部地质构造、各类断裂(包括区域断... 详细信息

本文主要介绍杭州湾北岸三个拟建的核电站选址的地球物理调查工作概况。文中重点归纳了核电站选址三阶段中地球物理任务及解决的主要问题,介绍了利用综合地球物理方法在解决与核电站选址有关的区域和深部地质构造、各类断裂(包括区域断裂和活动性断裂)、地震活动及站址岩土体动力参数测定等方面的结果,同时对杭州湾北岸是否宜建核电站也作了分析。

关键词：地球物理地球科学杭州湾核电站核电厂发电厂天然地震活动断裂