Results 31 to 40 of about 1,209 (125)
从“美国持续倾销与补贴补偿法”案看WTO反倾销规则的宗旨 [PDF]
, 2004 经过专家组和上诉机构的审理,WTO“美国持续倾销与补贴补偿法”案以被诉方美国败诉而告终,WTO还要求美国在合理期限内履行DSB的裁决。该案的裁决促使我们思考WTO反倾销规则的宗旨 ...
刘勇
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source
Gaoya dianqi, 2013 提出并实现了一种可与隔离断路器集成为一体的电子式电流互感器新型结构,介绍了产品的原理、结构及性能测试试验情况。产品利用空心线圈传感保护电流信号、低功率CT传感测量电流信号、远端模块就地采集空心线圈及低功率CT的输出信号、悬式光纤绝缘子保证绝缘并传输信号,具有绝缘结构简单可靠、体积小、质量小、测量准确度高、动态范围大、暂态特性好等特点。性能测试试验表明产品的测量准确度、温度特性及抗电磁干扰特性等关键性能满足入网运行要求。产品与隔离断路器集成为一体,能有效减小变电站的占地面积 ...
罗苏南 +5 more
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Differences in characteristics between naturalized threatened plants and other threatened plants
Conservation Biology, EarlyView.Abstract Many non‐native plant species introduced by humans have become naturalized. At the same time many species are threatened in their native range. However, the number of plant species threatened in their native range that are naturalized elsewhere remains unknown.
Weihan Zhao +10 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为比较研究不同土壤耕作方式（翻耕、旋耕、免耕）对南方双季稻区水稻产量构成与稻穗镉积累分配特性的影响，探讨镉污染稻田双季稻最优土壤耕作方式，2015—2017年，以"陵两优211"与"威优46"为早、晚稻供试品种，在湖南省湘潭县易俗河镇中度镉污染稻田（全镉含量0.86 mg/kg）开展定位试验，比较研究了双季免耕、双季翻耕、双季旋耕、早旋晚免、早翻晚免5种土壤耕作方式下土壤有效镉含量、双季稻的产量构成与穗镉积累分配情况。结果表明：（1）双季稻产量以双季翻耕处理最高，早翻晚免处理次之 ...
帅泽宇 +5 more
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Comprehensive framework for assessing and optimizing existing research networks
Conservation Biology, EarlyView.Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East +2 more
wiley +1 more source
, 1998 以田间小区试验和大区产量直接对比的方法研究了鱼腥藻提取认对水稻幼苗生长和产量以及产量构成要素的影响，并探讨了方便有效且适宜于大田使用的方法。用藻液处理后水稻幼苗增高，根数、根长增加，分蘖能力增强，秧龄提前，叶面积明显加大。水稻成熟后除株高比对照略有下降外，各项产量构成要素如粒数、粒重、有效分蘖数、植株干重、千粒重、穗长等都优于对照组，但增产幅度随水稻品种和处理方式不同而异。大田使用时以１ ...
刘永定 +3 more
core +2 more sources
Dianci bileiqi, 1975 变压器用瓷套近几年来采用穿缆式的用户越来越多,这种型式的套管结构有便于密封、节省导体材料等技术经济价值。但由于穿缆式套管的中孔为异形结构,故给电瓷成型工艺造成较大的困难。许多兄弟厂对这类套管采用湿接成型工艺。这种工艺,存在着工序多,生产效率低,质量不稳定,操作技术要求较高等缺点。为了提高工效,稳定产品质量 ...
醴陵电瓷厂技术科
doaj
Conservation Biology, EarlyView.Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 为探究茵陈蒿群落不同垂直结构对产流、产沙过程的影响，利用人工模拟降雨试验的方法，研究了不同垂直结构的茵陈蒿群落坡面侵蚀过程。结果表明：在植被盖度相同条件下，茵陈蒿多层群落结构（茵陈蒿+狗尾草+生物结皮）和双层群落结构（茵陈蒿+生物结皮）的减流、减沙效果显著优于单层群落结构，二者的减流效益分别为40.5%和22.6%，减沙效益分别为86.6%和73.5%。不同垂直结构的茵陈蒿群落累积产沙量均可表示为累积产流量的幂函数（R2＞0.98），表现为累积产沙量随累积产流量的增加而增加，且随群落结构层数的增加 ...
李盼盼, 王, 刘国彬, 李文达
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