Results 111 to 120 of about 107,409 (290)
Zhejiang Daxue xuebao. Lixue banIn order to study the pollution characteristics and source contributions of PM2.5 at Lin'an, located in Hangzhou City, the PM2.5 component online monitoring was conducted from December 23, 2021, to February 28, 2022, and the sources apportionment of PM2 ...
马勤(MA Qin), 许振波(XU Zhenbo)
doaj +1 more source
Policy Studies Journal, EarlyView.Abstract Green industrial policies aim to create local value from renewable energy (RE) technologies. One policy instrument includes local content requirements (LCR), which prescribe a minimum share of locally manufactured inputs for investments in RE. However, the policy effectiveness of LCR differs.
Laima Eicke
wiley +1 more source
, 2015 建立HPLC 法测定菊芋叶中绿原酸含量的方法,对菊芋植株中不同部位绿原酸的分布规律,以及不同品系、盐度、采摘时间等因素对菊芋叶中绿原酸含量的影响情况进行研究。方法:色谱柱为Hypersil BDS C-18(4.6×250 mm,5 μm),流速为1 mL min-1 ,检测波长为327 nm,进样量为10 μL,柱温为30℃,流动相为0.1%三氟乙酸水(A)-乙腈(B)。结果:菊芋叶中绿原酸的含量(3.40%)显著高于其他部位绿原酸的含量;10 ...
夏传海 +1 more
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Institutions, in time: Designing feedback pathways for shared infrastructure transitions
Policy Studies Journal, EarlyView.Abstract Electric utilities, challenged by a rapidly unfolding energy transition, use many informal institutions to bridge across technologies and sectors. Little is known, however, about how electric utility systems and other polycentric systems' institutions‐in‐use vary and evolve over time.
Matthew Grimley +6 more
wiley +1 more source
Chemical constituents from Wedelia prostrata and their cytotoxicity activity [PDF]
, 2016 卤地菊（Wedeliaprostrata（Hook.etArn.）Hemsl.）为菊科蟛蜞菊属植物。对蟛蜞菊属植物研究调查表明，其主要含有二萜，倍半萜，黄酮和有机酸等化学成分。二萜尤其是对映-贝壳杉二萜类是蟛蜞菊属植物的主要活性成分，具有抗菌、抗病毒、抗氧化、抗癌、抗血管生成等生物活性。 本文首先用石油醚、乙酸乙酯、正丁醇三种不同极性的溶剂依次对卤地菊的乙醇提取物进行萃取，初步得到三个萃取部位，对卤地菊石油醚部位进行系统的化学成分研究，采用硅胶柱层析、聚酰胺柱层析、葡聚糖凝胶柱层析 ...
林剑虹
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野生动物学报, 2005 生境（habitat）,又称栖息地（动物学）或生长地（植物学）,是指生物生活的空间和其中全部生态因子的总和,包括某个体或群体生物生存所需的物理的和生物的环境。一个特定濒危物种的生境,是指该物种所占有的资源（如食物、隐蔽物、水土资源和空间资源等）,物理化学因子（温度、适度、盐度、雨量等）,以及生物之间的相互作用 ...
王小钢
doaj
Policy Studies Journal, EarlyView.Abstract OECD countries are grappling with a policy design dilemma, as they strive to balance fiscal sustainability with the increasing demands on the welfare state. This study introduces a new perspective on policy design that integrates the two elements of “social cohesion,” comprising government trust and civic engagement.
Jiwon Kim
wiley +1 more source
Study on restoration of benthic macrofaunal community in Xiatanwei artificial mangrove wetlands, Tong’an Bay [PDF]
, 2016 红树林生态系统处于海洋与陆地的动态交界面，是我国三大海岸带生态系统之一。底栖动物(包括大型、小型和微型底栖动物)是红树林生态系统的重要组成部分，同时也是该生态系统内物质循环、能量流动中积极的消费者和转移者。关于同安湾潮间带、潮下带和红树林湿地大型底栖动物群落生态的研究已有报道，但关于同安湾人工红树林湿地大型底栖动物群落恢复、演替和功能群方面的研究稀少，且关于红树林群落边缘大型底栖动物的群落效应的研究未见报道。 本研究选取同安湾下潭尾人工红树林湿地作为研究区域 ...
颜露露
core
Assessing the Effect of Deservingness Cues on Tolerance for Administrative Burdens
Policy Studies Journal, EarlyView.ABSTRACT Beneficiaries of public programs must overcome several administrative challenges. Given what we know about the politics of the welfare state, it seems likely that the public's willingness to support reductions in burdens may be associated with the characteristics of potential policy targets including their life circumstances and their race ...
Simon F. Haeder
wiley +1 more source
Mass mortality of mangroves in Qingmeigang Bay, Sanya—an indication of mangrove fate resulted from accelerated sea-level rise in the future [PDF]
, 2015 在全球变化的各种效应中，海平面的上升是对红树林最大的威胁之一。发生在海南三亚青梅港红树林自然保护区的红树林突发大面积死亡事件作为海岸工程引起红树林淹水时间与深度增加并导致红树林大规模死亡的特例为研究海平面上升对红树林影响提供一个新的角度。未来不断上升的海平面对红树林的破坏作用在此次事件中被间接反映出来。对青梅港红树林死亡事件的调查研究不仅为青梅港地区红树林的恢复、管理提供理论依据，而且对于探讨海平面上升对红树林的影响存在重要意义 ...
傅海峰
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