Results 31 to 40 of about 1,231,507 (167)

20世纪20-30年代的西北区域地质调查

open access: yes, 2008
20世纪20~30年代,随着开发西北热潮的兴起,中国地质学者逐步在西北地区开展了区域地质调查工作。本文重点分析较早在西北地区开展地质调查工作的中瑞西北科学考查团的成就 ...
张九辰
core  

Predictions of southern migration timing in coastal sharks under future ocean warming

open access: yesConservation Biology, Volume 39, Issue 6, December 2025.
Abstract Projected redistribution of marine species due to ocean warming may undermine current conservation efforts. Yet, there have been few studies on how ocean warming may alter migration timing. Across 5 years of acoustic telemetry data (2018–2022), we determined environmental drivers of southward migration timing for 6 migratory shark species from
Maria H. Manz   +16 more
wiley   +1 more source

西北地区粮食生产潜力与开发策略

open access: yes, 1999
西北地区包括陕西、宁夏、甘肃、青海和新疆5个省(区),土地面积302.4万平方公里,人口8400多万人。这里水土流失严重、生态环境脆弱、生产力低下,致使粮食生产成为该地区生态农业建设与农业持续发展的关键。随着国家战略中心西移、新能源重化工基地建设以及对农产品增长的迫切需求,这一地区在国民经济发展中的地位日益重要。因此,深入研究西北地区粮食生产的潜力和开发途径,对当前和未来农业生产和社会可持续发展具有重要意义。一、粮食生产现状1949年以来西北地区粮食生产的增长过程大致经过了以下4个阶段,1949 ...
上官周平, 邵明安
core  

Coexistence and habitat restoration planning for the reintroduction of Spix's macaw

open access: yesConservation Biology, Volume 39, Issue 6, December 2025.
Abstract Spix's macaw (Cyanopsitta spixii) is one of the world's most endangered species. Native to the Caatinga of northeastern Brazil—a region marked by significant socioeconomic vulnerability—the species was considered extinct in the wild in 2000. A reintroduction project, however, returned it to its natural habitat in 2022. The long‐term success of
Ugo Eichler Vercillo   +3 more
wiley   +1 more source

西北地区生态环境灾害与逆转措施

open access: yes, 1994
西北地区是生态环境恶性循环的重点地区之一。各种人为的不合理生产活动,使生态环境灾害日益突出,增加了抗灾难度,严重制约国民经济的发展。因此,防御生态灾害在国民经济发展中具有举足轻重的作用。针对生态灾害给西北地区工农业发展所带来的损失,对生态灾害的基本规律进行了系统分析,同时论述了国民经济发展中生态灾害形成的主要原因 ...
彭珂珊
core  

Fuerza Feminista: Confronting Intersectional Data Violence by Archiving the Movement Against Antifeminicides in the Paso del Norte Region

open access: yesSexuality, Gender &Policy, Volume 8, Issue 4, November 2025.
ABSTRACT For over 30 years, the northern Mexican state of Chihuahua bordering Texas and New Mexico has experienced and witnessed multiple forms of violence across its rural and urban regions. Communities are besieged with cartel and gender‐based violence and the saturation of international corporations that pay less than livable wages for workers in ...
Sylvia Fernández Quintanilla   +1 more
wiley   +1 more source

陕西地区110千伏及以上送电线路污闪事故的调查和分析

open access: yesDianci bileiqi, 1981
陕西省地处我国西北内陆,位于黄河中游,全省可分为三个区域:陕北为沙漠和黄土高原,气候寒冷干燥,年平均最大降雨量仅在500毫米以下;关中地区,南依秦岭,北接陕北黄土高原,地形平坦,气候温和,为半干燥地区;秦岭以南为陕南地区,除汉中、安康盆地较平坦外,其他地区山峦起伏,自然植被好,森林繁茂,为亚热带湿润气候,年平均最大降雨量达1250毫米。解放以来,陕西的电力工业得到迅速发展,高压送电线自1957年西(安)—户(县)线投产以来到1980年止 ...
胡其秀
doaj  

西北地区特色数据库现状分析

open access: yes, 2009
从上世纪90年代开始,西北地区就有许多图书馆和研究机构尝试建设特色数据库,通过十余年的努力,特色数据库建设得到飞速的发展。文章通过对西北地区特色数据库资源的现状调查分析,总结出其特色和优势所在 ...
张延敏
core  

Border Women Literature and Feminist Cartographies: Student Approaches to Dataset and Visualization Development for Gender‐Based Violence Documentation

open access: yesSexuality, Gender &Policy, Volume 8, Issue 4, November 2025.
ABSTRACT Researching gender violence and transnational feminist movements fuels commitment to meaningful change. Drawing on Toni Morrison's 1998 call to refuse desensitization to violence, examining how three university students—Niloufar Esmaeili (PhD English), Jessica Corona (MA Spanish), and Jasbeth Medrano (Political Science undergraduate)—engaged ...
Niloufar Esmaeili   +2 more
wiley   +1 more source

西北地区生态修复的若干基本问题探讨

open access: yesShuitu Baochi Xuebao, 2003
综合已有的研究成果,对西北地区缺水类型,生态修复的终极目标和绿洲规模的确定基本问题进行了探讨。西北地区缺水类型分析结果表明,不同区域缺水类型组合不同,西北地区潜在景观具有多样性的特点,原生景观具有复杂性的特点,这在黄土高原表现得尤为突出,西北地区生态修复的终极目标是:从潜在景观到原生景观。通过景观研究可指导水资源胁迫下的西北地区生态修复的景观配置与建设;第一,西北地区西部干旱环境形成年代久远,在其长期进化过程中,形成了适宜干旱环境生长的植被类型和种类,这是西北地区生态修复应首选的类型和种类 ...
毛德华 夏军 等
doaj  

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