Results 41 to 50 of about 949,091 (156)
Integrative Conservation, Volume 5, Issue 1, Page 137-149, March 2026.Pometia pinnata demonstrated life‐stage‐specific genetic responses to landscape features, with asymmetric gene flow patterns and population recovery following historical bottlenecks, revealing complex topographic and demographic influences on forest genetic structure.
Madhuparna Chatterjee +5 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 3, Page 272-282, March 2026.ABSTRACT Objective Complete hydatidiform mole and coexisting normal fetus (CHMCF) is a rare condition for which there is significant heterogeneity in diagnosis, counseling and management of complications. The objective of this study was to summarize the prevalence of clinical outcomes in reported cases of CHMCF.
N. Salmeri +8 more
wiley +1 more source
人细小病毒B19抗体及抗心磷脂抗体(aCL)在流产人群中的检测价值
Zhongguo shiyan zhenduanxue, 2018 目的探讨人细小病毒B19抗体及抗心磷脂抗体(aCL)在流产人群中的检测价值,为流产的预防提供理论依据。方法本研究观察对象为2015年1月-2017年1月于我院妇产科就诊的386例自然流产患者以及年龄配对的200例自愿终止妊娠的孕产妇,分别设为观察组与对照组。抽取空腹肘静脉血4ml,离心分析血清后采用酶联免疫吸附试验(ELISA)检测两组孕产妇血清aCLIgG、aCLIgM水平和B19IgG、B19IgM水平,比较两组孕产妇B19IgG、B19IgM、aCLIgG、aCLIgM阳性率以及血清平均水平 ...
高阳 +4 more
doaj
Governance of Climate‐Induced Relocation in the US: An Exploration of Institutional Complexity
Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT Climate change has and will continue to have a profound effect on both individuals and the communities in which they reside. A pressing question is how communities forced to confront climate‐induced catastrophe—including both rapid and slow‐onset hazards—undertake the decision of how and when to relocate, particularly given the multiple scales
Christopher S. Galik, Brad A. Johnson
wiley +1 more source
, 2009 文章利用澳大利亚生产率委员会所计算的自然人流动壁垒值,从政府的角度分析了影响东道国设置自然人流动壁垒的因素。研究结果显示,东道国国内居民收入、就业状况以及居民的受教育状况对政府选择自然人流动壁垒有显著影响,而贸易状况和外商直接投资的影响则不显著。此外,考虑到一国(地区)行为选择的溢出性,文章首次从文化距离和制度距离的角度考察了一国(地区)的自然人流动壁垒的空间相关性,结果显示一国(地区)的自然人流动壁垒在基于文化距离和制度距离的空间上都存在一定的空间相关性,一国(地区 ...
钱争鸣, 邓明
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Photocatalytic molecular oxygen (O2) activation provides a sustainable approach to produce singlet oxygen (1O2) for organic contaminants detoxification. However, the charge carriers‐involved pathway usually suffers from unsatisfactory 1O2 production efficiency owing to energy loss caused by photogenerated hole‐mediated superoxide species (•O2−
Yan‐Biao Shi +8 more
wiley +1 more source
Shuitu Baochi Xuebao, 2003 水土流失是破坏自然环境最严重和最突出的问题,我国是水土流失非常严重的国家,几乎遍 及所有的省、自治区、直辖市,共有水土流失面积492万km2,占国土面积的51.2%.严重 的水土流失不仅对自然环境造成破坏,也严重制约国民经济的发展.水利水电工程、矿产资 源开发、公路铁路建设、城镇开发建设等西部开发工程中,都将遇到水土流失与环境问题, 本文阐述了西部地区水土流失与环境的现状,分析了工程建设对水土流失与环境的影响,提出西部开发工程中防治水土流失的措施.
党进谦, 阎宁霞, 李靖
doaj +2 more sources
Shuitu Baochi Xuebao, 2017 以北京山区人工侧柏林地坡面为研究对象，基于2个2 m×5 m径流小区，设枯落物覆盖自然坡面与裸露坡面2种处理、大小2种雨强（126，70 mm/h），通过对比分析2种处理下坡面产流产沙过程，揭示林下枯落层覆盖对北京山区坡面产流产沙的影响。结果表明：（1）与裸坡相比，枯落物覆盖自然坡面产流产沙分别减少了67.0%和90.6%，其中，减沙效益大于减水效益。（2）无论是枯落物覆盖自然坡面还是裸坡，坡面产流过程均表现为先增大后趋于稳定的变化规律，但枯落物覆盖坡面产流趋于稳定的时间较裸坡有所提前。(3 ...
何玉广, 余新晓, 樊登星
doaj
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang +7 more
wiley +1 more source
, 2009 通过对新疆天池自然保护区春季融雪期间径流小区的定位观测试验,对新疆天池自然保护区不同土地利用类型的降雪、积雪和融雪产流规律进行了研究。结果表明:(1)雪岭云杉的截雪率明显高于杨树,约75%,是杨树的3~4倍;(2)不同土地利用类型的融雪产流率依次为:裸露地(15.6%)>杨树林地(8.5%)>草地(1.6%)>雪岭云杉林(0);(3)比起林地,草地融雪径流发生的时间较早;(4)植被因子、坡度、土壤性质都显著地影响着草地融雪径流量的大小 ...
王大庆 +4 more
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