Results 41 to 50 of about 2,743 (170)
Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 5, Page 661-668, November 2024.ABSTRACT Objective To determine the diagnostic accuracy of virtual autopsy using whole‐body postmortem ultra‐high field magnetic resonance imaging (MRI) at 7 Tesla (T), using a short T2‐weighted imaging (T2‐WI) protocol, compared with classical autopsy, for detecting structural abnormalities in small second‐trimester fetuses. Methods Thirty consecutive
A. Staicu +11 more
wiley +1 more source
Environmental and economic assessment of the intensive wheat - maize production system in the North China Plain [PDF]
, 2016 To ensure food security for its vast population input intensification in crop production has been one of Chinas major strategies in the last decades.
Ha, Nan
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DHR‐PA—Democracy and human rights in public administration in Africa
Politics &Policy, Volume 52, Issue 2, Page 426-449, April 2024.Abstract While public administration research has traditionally paid profound attention to democratic values in government‐citizen relations, public institutions are still wrestling with entrenching human rights norms today. This article's Democracy and Human Rights in Public Administration (DHR‐PA) perspective offers a view that a human rights ...
Gedion Onyango
wiley +1 more source
Comprehensive Geochemical Evaluation and Influencing Factors of Topsoil Nutrients in a Farming Area of Dabie Mountain in Western Anhui, China [PDF]
Western Anhui is an important precision agricultural area in China, characterized by diverse landforms and multiple soil types. To determine the spatial distribution of soil nutrient elements and their controlling factors, we analyzed 5 nutrient ...
Chao SONG +5 more
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Journal of Consumer Behaviour, Volume 23, Issue 1, Page 90-106, January 2024.Abstract This study aims to explore thematic influences on theme park visitors' satisfaction through user‐generated data. To this end, we first used an unsupervised machine learning method, structural topic modeling, and analyzed 112,000 reviews post by visitors to Shanghai Disney Resort from June 16, 2016 to March 4, 2022.
Shizhen Bai +8 more
wiley +1 more source
Assessing Nitrate Leaching With GLEAMS Model in an Agricultural Small Catchment in Southeast China. [PDF]
, 2007 应用GLEAMS模型估算我国东南亚热带地区农业小流域硝态氮的渗漏淋失。在五川流域8种不同土地利用方式的农田中埋设渗漏监测装置,每月采集水样分析硝态氮含量。用2002年4—12月作物生长季节的实测数据进行模型校验的结果表明,模型对水稻田除外的其他土地利用方式下硝态氮渗漏淋失模拟效果较好。五川流域2002年硝态氮淋失模拟计算结果表明,不同土地利用方式下硝态氮淋失时空差异显著,全年渗漏量(以氮计)为4.6438.39 kg.hm-2,流域面积加权平均为29.99 kg.hm-2。甘蔗地 ...
曹文志, 王吉苹
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Testing GLEAMS for Nitrate Leaching Modeling in an Agricultural Catchment of Southeast China [PDF]
, 2007 利用我国东南亚热带地区农业小流域不同土地利用方式的硝氮渗漏淋失实测数据检验了GLEAMS(Groundwater Loading Effects of Agricultural Management Systems)模型在该地区的适用性。通过现场试验和实地调查并结合模型手册,获取模型所需的水文和营养盐参数,参考模型参数的敏感性分析结果对模型进行调试。结果表明模型对水稻田除外的其它土地利用方式的硝氮渗漏淋失模拟效果较好。水稻田渗漏模拟效果差的主要原因在于模型的水分平衡方程不能反应水稻田长期淹水的实际情况 ...
徐玉裕 +3 more
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Shuitu Baochi Xuebao, 2019 作物轮作通过影响通用土壤流失方程（USLE）中作物覆盖和管理因子C值的变化和改良土壤性质而减少坡面土壤侵蚀。基于东北薄层黑土区连续6年大豆-红小豆轮作和裸露休闲坡面小区的径流泥沙和降雨资料，分析了2011-2016年研究区侵蚀性降雨特征，探讨了作物轮作防治坡面土壤侵蚀的效果，研究了作物轮作C值的年内和年际动态变化。结果表明：研究区所有侵蚀性降雨皆发生在5-10月，其降雨量占全年降水量的32.5%~68.1%，且年内和年际分布不均。对于5°坡度的裸露小区，土壤侵蚀主要发生在6-8月 ...
富涵, 郑粉莉, 覃超, 王磊
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Jixie chuandong, 1996 降低镗铣床噪声的方法中州大学李宗智引起啮轮噪声的原因很多。例一对齿轮在啮合时，由于两齿面间的相对滑移速度的不断变化，使齿面产生摩擦，由于摩擦的自激振动而产生噪声。又如，齿轮在传动时，因交变力的作用使齿轮作轴向振动，由此引起噪声。轮齿的变形，齿轮的制造...
李宗智
doaj
一、中国农业发展所面临的主要问题中国是世界农业的起源地之一,拥有上万年的历史。中国农业取得了伟大的成就,养活了世界上最多的人口。同时哺育了灿烂的中华文化。也给世界文明做出了巨大的贡献。历史事实不可争辩地说明,这是一种可持续的农业。但中国农业的问题至今依然没有解决。靠什么吃饭?谁来养活中国?一直就是个问题。毫无疑问,问题的关键在于耕地。2008年年底 ...
曾雄生
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