Results 81 to 90 of about 847,250 (203)
, 2008 对贵州红水河谷地区的500余号苔藓植物标本进行了调查、采集和分类鉴定,得到苔藓植物36科,78属,204种(包括8亚种4变种和1变型)。其中藓类植物23科60属163种,苔类植物13科18属41种。为贵州增加新记录5种。划为13种类型。其中具热带性质的区系成分最丰富,占总数的38.02%,构成该区苔藓植物区系成分的主体;具温带性质的成分占总数的33.85%;东亚成分、特有成分、东亚-北美成分占该区的1.56%。选择9个地区,通过属和种的相似性系数全面比较 ...
熊源新, 闫晓丽
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Conservation Biology, EarlyView.Abstract Global farmland biodiversity is declining rapidly, threatening both natural ecosystems and agricultural production. Although agri‐environmental schemes incentivize farmers to adopt environmentally friendly measures, the spatial mismatch between their local implementation and the landscape‐scale habitat requirements of farmland species has been
Annika L. Hass +5 more
wiley +1 more source
, 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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A framework for integrating resilience indicators into risk assessments
Conservation Biology, EarlyView.Abstract Globally, ecosystems are increasingly threatened by climate change and human pressures, yet ecosystem risk assessments predominantly emphasize exposure to stressors while overlooking intrinsic ecosystem resilience—the capacity to absorb and recover from disturbances.
Benoît Pichon +4 more
wiley +1 more source
q-Pauli Matrices and a Representation of the Quantum Heisenberg Algebra(q-泡利矩阵与量子Heisenberg代数的一个表示)
Zhejiang Daxue xuebao. Lixue ban, 1999 本文给出了量子力学中经典泡利矩阵的q-形变和单参数量子Heisenberg代数的一个表示.
LiFang(李方), TianRongxiang(田荣湘)
doaj +1 more source
, 1989 作者根据黔东南地区各主要河流实地考察的结果及前人积累的资料,对黔东南地区的鱼类区系组成、形成原因及其在我国动物地理区划中的地位作了探讨,认为黔东南地区正处在东洋区南亚亚区和南东亚亚区的交替地带,其中打狗河应属于南亚亚区的云贵高原东部鱼类区系,沅江清水江和都柳江应分别归于南东亚亚区的华东小区和华南小区;同时,还特别讨论了云贵高原东部地区一些特殊鱼类类群的发生和发展 ...
陈宜瑜, 王大忠, 李德俊
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A Systematic Scoping Review of Self‐Regulated Learning With AI in Language Education
International Journal of Applied Linguistics, EarlyView.ABSTRACT The rapid development of artificial intelligence (AI) technology has brought new opportunities for second/foreign language (L2) education while also raising concerns about the use of AI tools. This systematic scoping review provides a snapshot of the current state of research situated at the intersection of self‐regulated learning (SRL) and AI
Zheng Zhang, Sihan Zhou, Barry Bai
wiley +1 more source
西部欠发达地区城镇体系分形研究——以兰州—西宁城镇密集区为例
, 2010 不同区域特殊的自然、区位、历史条件,人口、资源、经济发展形成了城镇体系成长的区域背景,在很大程度上,它影响并决定城镇体系的成长过程与发展规律。引入分形(fractal)理论,以兰州-西宁城镇密集区为例,研究西部欠发达地区城镇体系的空间结构、规模结构及其形成机理。通过对城镇体系分形维数的研究,反映特定自然、社会、经济条件下,西部欠发达地区城镇体系空间结构、规模结构特征。城镇体系规模等级分布分散,呈明显的首位分布,大中城市发展不足,城镇体系规模等级总体偏小,人口在城镇之间分布的均匀性差。城镇空间发育度较低 ...
雷军 +4 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Many existing rubrics for L2 argumentative writing prioritize form‐based linguistic accuracy and complexity while insufficiently addressing substantive argumentative rigor and effectiveness. This limitation is further complicated by cross‐cultural variation in rhetorical conventions and educational practices, which challenge the direct ...
Zihan Xu, Peiyun Liu
wiley +1 more source
乌鲁木齐地区野生种子植物区系研究/Study on the Flora of Wild Seed Plants in Urumqi[J]
, 2012 [目的]乌鲁木齐地处中温带半干旱大陆腹地,有着较为丰富的野生植物资源.研究其野生种子植物区系,对了解乌鲁木齐野生植物资源现状、起源、演化,以及对植物资源的保护和合理开发利用都有十分重要的意义.[方法]在野外调查的基础上,结合有关文献和植物标本资料,对乌鲁木齐野生种子植物区系进行研究.[结果]乌鲁木齐有野生种子植物1 073种(含变种),分属78科416属.[结论]乌鲁木齐地区的种子植物种类丰富,单种科属多,区系优势显现明显；区系地理成分复杂,分布区类型多样；植物区系温带性质明显 ...
YIN Lin-ke +9 more
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