Results 31 to 40 of about 1,328,121 (160)
Moving in Cycles: Explaining the Failure of Militarization to Address Illegal Mining in Ghana
Politics &Policy, Volume 54, Issue 4, August 2026.ABSTRACT Mining contributes to Ghana's economic growth but also imposes significant social costs—land dispossession and unemployment—which have fueled the rise of illegal mining (galamsey). Galamsey, which intensified during the commodity boom of the 2010s, provides livelihoods while simultaneously worsening environmental degradation and social ...
Sulemana Alhassan Saaka, Phil Faanu
wiley +1 more source
, 2008 新疆盐生植物共有331种(包括15变种7亚种),隶属于38科、125属。对新疆盐生植物区系科、属的组成和地理成分进行分析,结果表明:新疆盐生植物区系地理成分多样,区系成分以温带为主,共9科,占总科数的23.68%,除去世界分布科,所占的比例高达56.25%。在属的水平上,温带成分和古地中海成分占优势,分别占总属数的38.4%和36%。单种属、寡种属多,优势现象明显,植物区系具有强烈的旱生性和古老性,特有成分比较低,中国特有成分仅1属 ...
王雷 +4 more
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四川大学学报. 自然科学版, 2012 本研究旨在从DNA水平揭示四川、重庆和贵州地区山羊的母系起源和群体遗传特征.通过对川渝黔地区13个山羊品种(类群)共152个体或序列mtDNA D-loop高变区HVI片段(481 bp)变异的分析,结合13个山羊参考序列(分属于A、B、C、D、F和G单倍群)构建系统进化树和单倍型网络分析以及不同单倍群群体扩张分析,结果表明:152只山羊mtDNA DloopHVI序列被类聚为A和B两个单倍群,其中单倍群B又分化为B1和B2两亚单倍群.从2种单倍群的地理分布特征可以发现 ...
蔡欣 +5 more
doaj
Basic income trials and the politics of scale: A research agenda
Policy Studies Journal, Volume 54, Issue 3, August 2026.Abstract The growing popularity of basic income has led to extensive trials of the policy in numerous settings across the world. However, analysis of the politics of basic income, and in particular the political dynamics preceding and resulting from trial programs, lags. In response, we propose a research agenda that uses political scale to investigate
Jurgen De Wispelaere +2 more
wiley +1 more source
Auto-focus technology and its application based on image processing
, 2009 Auto-focusing technique is an important method to improve the precision,intelligentization,automatization for the indentation diameter measurement.The paper introduces an auto-focus method of indentation diameter measurement based on image processing ...
Chen, Xiaomei, Yang, Tao, Zuo, Yong
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四川大学学报. 自然科学版, 2008 岷江上游地区位于四川北部,是世界生物多样性保护的热点地区.区系分析结果显示保护区内有种子植物107科,444属,1091种,其中裸子植物6科,11属,42种;被子植物101科,433属,1049种.种子植物科的分布区类型有12个,具有较强的热带性质,泛热带(热带广布Pantropic)型29科,占总科数的40.28%,属的分布区类型有15个,以温带区系成分为主,共225属,占总属数的56.53%,种的分布区类型有15个,其中特有种501个,占总种数的50.81%.该地区区系成分较复杂,特有成分较多 ...
孙钠, 何兴金, 周颂东
doaj
Functional Ecology, Volume 40, Issue 7, Page 2332-2344, July 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen +9 more
wiley +1 more source
Policy &Internet, Volume 18, Issue 2, June 2026.ABSTRACT In an era of proliferating but divergent data protection regimes, the European Union's rights‐based approach and China's sovereignty‐centric model have become two dominant poles of global data governance. This article examines how multinational enterprises navigate compliance under these dual systems and how that compliance is shaped through ...
Yiping Cao
wiley +1 more source
野生动物学报, 2018 狼是狗的近亲,通常可以利用形态学及行为学方法鉴别二者。当遇到缺乏完整形态特征的部分组织时,分子生物学鉴别方法成为重要的技术手段。本研究探讨了利用mtDNA控制区鉴别狼和狗的可行性。通过分析106条狼和狗mtDNA控制区部分序列(676 bp),结果得到47个独立的单倍型。这些单倍型具有62个多态位点,其中包括29个狼特异性位点和11个狗特异性位点。这表明mtDNA控制区序列可以用于鉴别狼和狗。基于单倍型的系统发育分析表明,75% 狼单倍型具有独立的世系,另有3个狼单倍型与狗共享同一世系 ...
江泓慧 李 波 马 跃 徐艳春
doaj
, 2008 主体功能区和土地利用分区是两种既有联系又有区别的空间分区类型。通过对主体功能区和土地利用分区的分区指标、内容和目的进行了关联分析,表明主体功能区是土地利用分区的宏观指导,土地利用分区是主体功能区的微观实现,土地利用分区的指标体系的选择 ...
黄莹, 张斌, 覃发超, 李铁松
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