检索结果-南通市图书馆

Open Journal of Soil Science 2014年第2期4卷 57-63页

作者： A. U. Akpan-Idiok K. I. Ofem Department of Soil Science University of Calabar Cross River State Nigeria.

Obudu Cattle ranch covers an area of 2400 hactares at an altitude of 900 - 1500 m above mean sea level and is suitable for cultivation of cucumber (Cucumis sativus), tomato (Solanum lycopersicum), Irish potato (Solanum tuberosum), spinach (Spinacia oleracea) cabbage (Brassica oleracea), lettuce (Lactuca sativa) because of its semitemperate climate. Physicochemical characteristics, degradation rates and vulnerability potential of the soils were studied. Eighteen composite soil samples (0 - 15 and 15 - 30 cm) were collected at interval of 500 m along North-South and East-West transects in nine locations. The soils were characterized as follows: texture of sandy loam for the surface and subsurface soils;pH(H2O) (4.7 - 5.7), organic carbon (4.9 - 74.8 gkg-1), total nitrogen (0.2 - 4.8 gkg-1), carbon-nitrogen ratio (14 - 25), available P (6.66 - 107.89 mgkg-1), effective cation exchange capacity (ECEC) (5.58 - 14.62 cmol·kg-1) and base saturation (49.37% - 85.28%);the surface soils were generally higher in organic carbon, total nitrogen, available P and ECEC than the subsurface. The Soil Degradation Rate (SDR)/ Vulnerability Potential (Vp) weighted values of texture (3/3), soil pH(H2O) (4/2), organic carbon (1/5) and base saturation (2/4) showed moderate to low susceptibility of the soils to degradation or vulnerability. The soils could be managed by liming, practicing crop rotation and using soil conservative measures.

关键词： Physicochemical Characteristics Obudu Cattle ranch Soil Degradation Vulnerability Potential

Design of ranch Fire Monitoring System Based on Zig Bee Technology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Agricultural Research 2015年第3期7卷 96-98页

作者： Chao ZHANG College of Physics and Electronic Engineering Taishan University

This paper designs a way to introduce Zig Bee technology into the ranch fire monitoring system,and builds a real-time ranch fire monitoring system based on Zig Bee wireless sensor network.The system can monitor the parameters related to ranch in real time,such as air moisture,temperature and smoke density,so as to provide information support for ranch fire prevention and extinguishment.This paper researches the circuit design of Zig Bee wireless sensor network node,node information collection,data fusion,transmission and effective topological structure of sensor network.

关键词： ZigBee Fire monitoring ranch

Long-Term Fate of Agent Orange and Dioxin TCDD Contaminated Soils and Sediments in Vietnam Hotspots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Soil Science 2019年第1期9卷 1-34页

作者： Kenneth Ray Olson Lois Wright Morton Department of NRES College of Agricultural Consumer and Environmental Sciences University of Illinois Urbana IL USA Department of Sociology College of Agriculture and Life Sciences Iowa State University Ames IA USA

The soils, tropical climate, and network of canals and rivers of southern Vietnam have created one of the most diverse tropical jungles and intensely cultivated landscapes of Southeast Asia. This paradise has a long history of numerous wars, foreign occupations, and most recently the Second Indochina War (aka the Vietnam War 1965-1972) which defoliated rain forests and ancient wetland mangroves and left behind contaminated soil and sediment hotspots. During this war, the United States (US) military sprayed 80 million liters of Agent Orange contaminated with the dioxin TCDD in a guerrilla war against communist insurgents. Agent Orange was a synthetic plant growth regulator comprised of equal amounts of two herbicides 2,4-dichloro phenoxyacetic acid C8H6Cl2O3 (2,4-D) and 2,4,5-trichlorophenoxyacetic acid C8H5Cl3O3 (2,4,5-T). TCDD, the dioxin, 2,3,7,8-tetrachlorodibenzodioxin (C12H4Cl4O2) was an unintended byproduct of the accelerated combustion process used in the manufacture of herbicides containing 2,4,5-T. Agent Orange has frequently been blamed for soil and sediment contamination and long-term human health problems;however, the true source of harm is the dioxin TCDD. Agent Orange has a short half-life of days and weeks after application to vegetation, and has not been found to persist, after 50 years, in the water or soils of southern Vietnam. However, the half-life of dioxin TCDD depends on where it is deposited and varies from 1 to 3 years on soil surfaces that have been fully exposed to sunlight, to as long as 20 to 50 years or more when buried in tropical subsoils, and more than 100 years in river and sea sediments. Dioxin TCDD was heavily concentrated in the US Air Force bases in Vietnam where the herbicides were stored, loaded on planes and helicopters for aerial spraying, and used extensively around military base perimeter fences as a security measure to prevent surprise attacks. Bien Hoa Air Force base, 40 km northeast of Ho Chi Minh City, continues to be one of the mega-hotspots where after 48 years th

关键词： Soils of Vietnam Agent Orange Dioxin TCDD Herbicides Soil Contaminant Sediment Contaminant Half-Life Hotspots Operation ranch Hand US Airbases in Vietnam Vietnam War Cu Chi Soil Tunnels Guerilla Warfare Incineration

A Reassessment of Birth Defects for Children of Participants of the Air Force Health Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Epidemiology 2018年第4期8卷 187-200页

作者： George J. Knafl Chapel Hill NC USA

The Air Force Health Study (AFHS), also called the ranch Hand Study, investigated the impact of exposure to dioxin the toxic contaminant in Agent Orange on health, survival, and reproductive outcomes of male Air Force Vietnam War veterans. It was concluded that available reproductive outcome data did not provide support for an adverse association with paternal dioxin exposure. A more extensive set of AFHS data was used to reassess this conclusion, restricting to the case of birth defects in children fathered after the start of the first Vietnam War tour. Analyses started by repeating published analyses, followed by assessing decisions made in those analyses, for example, of excluding participants with dioxin levels below the detectable limit, using a threshold of 10 parts per trillion for a high dioxin level, and not adjusting for multiple conceptions/children of the same participant. Using data for all participants with measured dioxin levels, both veterans who served in Operation ranch Hand and other non-ranch Hand veterans, and after accounting for correlation within children of the same participant, the occurrence for children fathered after the start of the first tour of a major defect, a non-major defect, and multiple defects depended significantly on participants having a high dioxin level. These conclusions were not changed by consideration of covariates. In contrast to prior published analyses, the more extensive AFHS data provided support for an adverse effect of paternal dioxin exposure on birth defects. However, the study had many limitations that could have affected the conclusions.

关键词： Birth Defects Cross-Validation Dioxin Operation ranch Hand

Game ranching: A Sustainable Land Use Option and Economic Incentive for Biodiversity Conservation in Zambia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Ecology 2014年第9期4卷 571-581页

作者： Chansa Chomba Chimbola Obias Vincent Nyirenda Department of Mathematics and Statistics Mulungushi University Kabwe Zambia School of Agriculture and Natural Resources Disaster Management Training Centre Mulungushi University Kabwe Zambia School of Natural Resources Copperbelt University Kitwe Zambia

The ten provinces of Zambia were surveyed to determine number and size of game ranches situated in these areas up to the end of 2012/early 2013. Three classes of game ranches were developed as;1) ≥500 hectares as game ranch proper, 2) ≥50 - ranches keeping large mammals from the size of common duiker to eland were recorded with a growth rate of 6 per year for the period 1980-2012. The largest number was ornamental 98 (49%);large game ranches were 75 (38%) and the least was game farms 27 (14%). Thirty seven species of large mammals were recorded, of which, 15 were the most abundant with impala topping the list with 21,000 individuals (34%). It was found that of the ten provinces, Luapula, Western and Northern Provinces despite being largely rural with low population densities except for Luapula did not have any game ranch. The province with the largest number was Lusaka 71(36%), Southern 59 (30%), Central 31(16%), Copperbelt 19 (10%), Eastern and Northwestern 9 (4.5% each) and Muchinga was the least with 2 (1%). The rapid increase in the number of ornamental category is mainly attributed to the rise in the development of tourist accommodation facilities and high cost residential properties. This growth provides an opportunity to convert to game ranching schemes abandoned farmlands which are not currently useful to agriculture due to loss of fertility and other forms of land degradation. Similarly, parcels of land with natural ecological limitations should also be considered for such schemes. Rehabilitation of degraded land through ranching could also enhance carbon sequestration, a factor critical in minimizing carbon emissions and other green house gases.

关键词： Game ranch Province Number Species Increase Carbon Emissions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

WaiterFrom Hell

大学英语 1996年第11期 24-26+28页

作者： GenePerret

Cherish the Memory of CSF First Chairman Juan Antonio Samaranch

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Voice of Friendship 2010年第3期 12-13页

作者： Yin Shenglun

Ifelt very sad when learning that Juan Antonio Sama-ranch, an old friend of the Chinese people, had passed away. Thanks to my work, I was fortunate to have close contacts with Samaranch for five years. His brilliant p... 详细信息

关键词： friend brilliant contacts Chairman passed ranch ch

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国佳杯

中国摄影家 1994年第4期 2-28页

选择造就了我们——杰夫·贝索斯在普林斯顿大学2010届毕业典礼上的演讲

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

新东方英语（中英文版） 2013年第12期 38-41页

作者： Jeff Bezos 胡君

你会不会因自己天资聪颖而沾沾自喜?会不会因自己头脑灵光而以捉弄别人为乐?你该如何利用自己的天资?如何作出正确的抉择?下面就让我们来听一听亚马逊的创始人杰夫贝索斯在普林斯顿大学毕业典礼上所作的演讲。通过演讲,他希望告诉大家:... 详细信息

你会不会因自己天资聪颖而沾沾自喜?会不会因自己头脑灵光而以捉弄别人为乐?你该如何利用自己的天资?如何作出正确的抉择?下面就让我们来听一听亚马逊的创始人杰夫贝索斯在普林斯顿大学毕业典礼上所作的演讲。通过演讲,他希望告诉大家:聪明是一种天资,善良是一种选择,最终造就我们的并非天资,而是一路走来的各种选择。As a kid,I spent my summers with my grandparents on their ranch1)in Texas.I helped fix windmills2),vaccinate3)cattle,and do other chores.My grandparents belonged to a Caravan4)Club,a group of Airstream5)trailer6)owners who

关键词：普林斯顿大学毕业典礼杰夫 cattle ranch belonged spent really think careful

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

忠贞的公牛

新东方英语（中学版） 2015年第7期 56-58页

作者：欧内斯特·海明威雷起凤

忠贞不渝不见得全是好事,也不见得全是坏事。对公牛来说,自己因对斗牛和母牛的忠贞不渝遭到主人抛弃,最终命丧斗牛士之手;但对斗牛士来说,若没有公牛的忠贞不渝,他也不会有如此值得一斗、让他可以倾尽全力的对手。从前有一头公牛,他不... 详细信息

忠贞不渝不见得全是好事,也不见得全是坏事。对公牛来说,自己因对斗牛和母牛的忠贞不渝遭到主人抛弃,最终命丧斗牛士之手;但对斗牛士来说,若没有公牛的忠贞不渝,他也不会有如此值得一斗、让他可以倾尽全力的对手。从前有一头公牛,他不叫费迪南德,也一点儿都不喜欢花。他好战爱斗,他和其他所有的公牛斗,同龄不同龄的他都斗,是个常胜将军。他的犄角像木头一样结实。

关键词：费迪南德常胜将军 fight ranch wanted nothing Spanish 牛群卡斯蒂利亚 everything

维普期刊数据库