Results 51 to 60 of about 1,091,334 (218)
Uncovering correlates of decline and critical refuges for a threatened terrestrial mammal
Conservation Biology, EarlyView.Abstract Globally, the geographic ranges of numerous species are contracting. Identifying spatiotemporal patterns of threat impact can illuminate why species decline in some parts of their range but persist in others. We developed a correlative approach to identify species’ response thresholds and locate ecological refuge areas associated with ...
Natalya M. Maitz +5 more
wiley +1 more source
, 2009 文章以新疆南疆五地州为研究单元、以人均国内生产总值为测度区域经济差异的总体指标,从各地州人均GDP的标准差、标准差系数等角度定量测度了1997-2006年五地州经济差异的总体水平及其变化特征。然后,从各地州与南疆总体平均水平的比率的变化、各地州相对发展率的差异等定量测度了五地州经济差异变化的空间结构特征。最后,建立了南疆国内生产总值增长率与地州人均GDP的标准差之间的回归模型 ...
陆红霞, 卢家峰, 陈忠升
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Zhongguo shiyan zhenduanxue, 2016 目的探析胃癌患者外周血各凝血指标水平变化的意义。方法分析2012年4月至2015年3月在我院接受治疗的101例胃癌患者的临床资料。比较胃癌患者不同浸润深度、不同临床分期、不同分化程度以及不同病理类型间的活化部分凝血活酶时间（APTT）、凝血酶时间（TT）、凝血酶原时间（PT）、血浆纤维蛋白原（FIB）、血小板计数（PLT）、D-二聚体（D-D）的水平变化。结果胃癌患者不同浸润深度组间,黏膜组患者的FIB、PLT的水平明显低于肌层组（P0.05）。PT、FIB、D-D、PLT在胃癌不同临床分期间差异显著 ...
杨之敏, 邱堃, 王静
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Shuitu Baochi Xuebao, 2023 为探讨长期不同施肥与耕作条件下土壤与径流中氮磷化学计量关系变化。在紫色土坡耕地设5个处理:顺坡耕作无施肥(对照,CK)、顺坡耕作+化肥有机肥混施(T1)、顺坡耕作+单施化肥(T2)、顺坡耕作+1.5倍单施化肥增量(T3)和横坡耕作+单施化肥措施(T4),每个处理均设3个重复,分析2008—2017年土壤总氮(TNS)、总磷(TPS)含量与化学计量TNS∶TPS,以及83场产流事件径流总氮(TNW)、总磷(TPW)浓度及化学计量TNW∶TPW的变化特征。结果表明:CK处理TNS ...
张海香 +4 more
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Conservation Biology, EarlyView.Abstract Ecological niche models (ENMs) are used to assess the abiotic preferences of species by linking their occurrences to the environmental conditions in which they live. We developed a fossil‐informed ENM framework that integrates mid‐Holocene and modern occurrences to test niche stability and reconstruct abiotic niche characteristics for four ...
Claire. M. Williams +3 more
wiley +1 more source
Local Public Goods Provision in the Post-Agricultural Tax Era in Rural China [PDF]
This paper investigates regional differences in local public goods provision in rural area in the 2000s, using large village sample surveys (CHIP 2002 and 2007 surveys, a survey in Ningxia).
Hiroshi Sato, Sai Ding
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, 2010 随着中西方交流的扩大，世界汉语热的逐渐兴起，中西文化之间的差异也越来越受到重视。"酒"作为一个既传承历史又通向未来的道具是一个值得我们认真研究的课题，进行中西酒文化的差异研究对中西交流交往有很大的帮助。本文主要论述中西方酒文化之间的差异 ...
饶清清
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Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
, 1998 一种正丁烷异构化制异丁烷反应用分子筛超强酸型催化剂，是含Ｔｉ或Ｚｒ元素的氢型ＺＳＭ－５，ＺＳＭ－１１或β分子筛与粘结剂和造孔剂成型，再经室温～１２０℃干燥，３００℃～７００℃焙烧而得。这种催化剂在１００～３００℃温度下，将正丁烷异构化成异丁烷，其正丁烷转化率可达５３％，异丁烷的选择性可达８５％。该反应过程适于在工业中应用 ...
孙承林 +7 more
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Zhongguo shiyan zhenduanxue, 2011 目的探讨酒精性肝硬化患者外周血激活素结合蛋白（FS）水平变化。方法采集临床诊断酒精性肝硬化患者40例及健康对照者40例,酶联免疫吸附试验检测外周血FS及激活素A（Activin A）水平。结果酒精性肝硬化患者外周血ALT、AST及GGT水平均高于健康对照组,统计学比较差异显著 ...
于昉 +5 more
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