Results 1 to 10 of about 683,854 (208)

Addressing the Interface between Patents and Technical Standards in International Trade Discussions (应对国际贸易问题中的专利与技术标准之争)

2009
openaire   +1 more source

黄土高原旱地苹果园油菜间作对土壤大孔隙结构的影响

Shuitu Baochi Xuebao, 2021
采用X-ray computed tomography（CT）技术研究了果树行间不同油菜间作密度（CK：清耕；L：低密度间作；M：中密度间作；H：高密度间作）对土壤大孔隙特征参数的影响。结果表明：油菜间作改善了果树行间（0—60 cm）土壤大孔隙特征，各土层的土壤大孔隙数量、大孔隙面积、大孔隙度等参数分别较清耕显著提高（P 1 mm）在各土层间的数目多、差异小，并且在0—30 cm土壤剖面上的成圆率最高。中、高密度油菜间作的土壤大孔隙特征参数均优于清耕及低密度间作，而中密度间作的土壤大孔隙分布更均匀 ...
何娜娜, 贾如浩, 叶苗泰, 赵西宁, 高晓东   +4 more
doaj  

黄土高原间作大豆对幼龄果园土壤水分及氮素累积的影响

Shuitu Baochi Xuebao, 2023
为探明间作豆科作物对幼龄果园土壤水分、硝态氮含量以及树木生长的影响,并对黄土高原旱作果园土壤肥力提升与可持续发展提供指导,以黄土丘陵区苹果/黄豆复合系统为研究对象,通过测定种植黄豆整个生育期内试验小区水分、硝态氮含量以及果树叶片含氮量和生理指标的变化来评价不同间作密度黄豆对果树生长的影响。结果表明:(1)相较于清耕果园,中密度间作在黄豆花期前对果园土壤水分含量有一定的提升作用,而高密度间作加剧行间水分的消耗,显著降低土壤含水量。(2 ...
安庆蓉, 赵西宁, 赵连豪, 罗立娇, 马南方, 高晓东   +5 more
doaj  

平行车间调度模型构建和系统设计

智能科学与技术学报, 2023
作业车间环境是一个高动态、强耦合的复杂系统，一种调度算法无法做到一次训练而终身使用，需要结合车间环境、作业过程、作业任务进行计算实验和渐进式学习。针对作业车间提出了一种基于平行系统理论的平行车间调度模型，实现了调度算法优化和系统演化。针对该模型，阐述了基于多智能体的人工车间调度系统建模、面向车间调度任务的计算实验方法，以及面向虚实系统的平行调度方法，实现了人工系统和实际系统之间的闭环控制，迭代优化。最后，在平行车间调度模型的指导下，设计了平行车间调度系统的技术架构和基本功能。
彭绍明, 熊刚, 沈震, 董西松, 曲之平, 付龙, 陶志坤, 韩云君
doaj   +1 more source

220kV避雷器及并联间隙对带电作业的影响

Dianci bileiqi, 2021
并联间隙、避雷器是线路防雷的重要设备,其安装结构在一定程度上短接了绝缘子的有效长度,以220 kV为例,通过试验、仿真计算分析了并联间隙、避雷器对带电作业的影响。首先通过模拟带电作业典型工况开展了间隙放电试验,获取了带避雷器、并联间隙线路带电作业间隙放电特性;然后根据带电作业绝缘配合方法,分析确定了220 kV带避雷器或并联间隙线路带电作业最小安全距离为2.1 m,比常规塔型要求高0.3 m;最后通过仿真建模计算分析了带避雷器或并联间隙线路带电作业空间的电场分布特性 ...
方玉群, 秦威南, 雷兴列, 彭勇
doaj  

Seasonal Spatial Population Density Distribution Dynamics of Lynx and Ungulate Prey in Cold‐Temperate Coniferous Forests 寒温带针叶林猞猁和有蹄类猎物种群密度空间分布的季节性动态研究

Integrative Conservation, EarlyView.
This study used camera trap data from 6 years between 2016 and 2021 and generalized linear mixed models to explore the factors that influence the spatial density distribution of lynx and its prey populations in warm and cold seasons in Inner Mongolia Hanma National Nature Reserve, China.
Wentao Zhang, Heng Bao, Chenbing Chu, Hualin Du, Jian Tong, Penghui Zhai, Weihua Zhang, Yang Li, Kun Yang, Xuankai Liang, Nathan James Roberts, Guangshun Jiang   +11 more
wiley   +1 more source

Evolution and Phylogenetics of the Javan Hawk‐Eagle Nisaetus bartelsi (Stresemann, 1924) Using Mitochondrial Data 爪哇鹰雕 Nisaetus bartelsi (Stresemann, 1924) 基于线粒体数据的演化与系统发育研究

Integrative Conservation, EarlyView.
This study reconstructs the phylogeny of the Javan Hawk‐Eagle (Nisaetus bartelsi) within the subfamily Aquilinae using Maximum Likelihood and Bayesian Inference algorithms on a blood sample and GenBank data. The analysis reveals that the sampled genus Nisaetus forms a monophyletic group. Furthermore, N. bartelsi occupies a sister‐taxon of N.
Almas Lathifatul Ula, Tuty Arisuryanti, Rury Eprilurahman, Dwi Sendi Priyono   +3 more
wiley   +1 more source

Threats to the World's Bears and Efforts to Conserve Them: Perspectives and Actions of IUCN Bear Specialist Group Members 世界熊类面临的威胁及其保护努力:IUCN熊类专家组成员的观点与行动

Integrative Conservation, EarlyView.
A survey of IUCN Bear Specialist Group (BSG) members revealed that habitat loss, degradation and fragmentation is the greatest threat to each of the 7 species of terrestrial bears. Poaching and human–bear conflicts are also high threats for some of these species.
David L. Garshelis, Karine Pigeon, Lydia Kolter, Anthony J. Giordano   +3 more
wiley   +1 more source

Between Dependence and Alienation: Understanding the Digital Minimalist Behavior of Chinese Millennials—An Analysis Based on SEM and fsQCA

Journal of Adolescence, EarlyView.
ABSTRACT Introduction Following rapid iterations in media technologies, Chinese millennials (born between 1980 and 1995) find themselves in a paradoxical state where digital saturation exists alongside fatigue, making them central practitioners of digital minimalist behavior.
Chao Zhang, Yinze Hao, Jingwen Li
wiley   +1 more source

Anecdotes or Ecological Patterns: Symbiotic Foraging Behaviors in Coyotes and Badgers 奇特模式还是生态格局: 郊狼与獾的共生觅食行为

Wildlife Letters, EarlyView.
Using a 3‐year, broad‐scale camera‐trap network in western Kansas, we tested whether coyotes and American badgers exhibit spatiotemporal patterns consistent with coordinated hunting. Despite high diel activity overlap, detection‐conditioned co‐detections occurred far less frequently than expected under independence, and short‐term temporal sequencing ...
Ty J. Werdel, Colleen W. Piper, Gabriela Palomo‐Munoz, Adam A. Ahlers   +3 more
wiley   +1 more source