Results 61 to 70 of about 1,133,635 (178)

Poverty, Inequality, and Social Security During the COVID‐19 Pandemic: Evidence From Linked Swiss Tax Data

open access: yesPoverty &Public Policy, Volume 18, Issue 3, September 2026.
ABSTRACT This paper examines the impact of the COVID‐19 pandemic on income and wealth inequality in Switzerland, with a particular focus on poverty dynamics and the role of the social security system. Using newly linked administrative tax data for four large cantons covering over a third of the Swiss population, we track changes in household income and
Oliver Hümbelin   +2 more
wiley   +1 more source

中国沙冬青属植物的地理分布及生境特征分析

open access: yes, 2015
沙冬青属(Ammopiptanthus Cheng f.) 隶属豆科(Leguminosae)蝶形花亚科(Papilionaceae)黄华族(Thermosideae),是亚洲荒漠唯一的常绿阔叶灌木,属下有2个种:新疆沙冬青(Ammopiptanthus.nanus)和蒙古沙冬青(Ammopiptanthus.
刘美
core  

Range‐wide sampling reveals cryptic lineages but largely conserved mycorrhizal associations in the Japanese fairy lantern Thismia kobensis

open access: yesPLANTS, PEOPLE, PLANET, Volume 8, Issue 5, Page 1407-1418, September 2026.
The jewel‐like flowers of Thismia are as rare as they are beautiful, often recorded from only a single site per species. Access to 15 populations of T. kobensis has enabled an uncommon, range‐wide assessment of morphology, genetics, and fungal partners. Our analyses showed that T.
Kenji Suetsugu   +4 more
wiley   +1 more source

塔里木河下游阿拉干断面胡杨树高的分布和密度

open access: yes, 2008
通过小尺度生态监测与遥感数据分析获取塔里木河下游胡杨(PopuluseuphraticaOliv.)林现状信息,将胡杨个体对输水的响应实测数据和QuickBird影像信息进行对比和分析,"面"上宏观调查与"点"上典型研究相结合,集中对塔里木河下游阿拉干断面设立的100hm2长期监测样方内的4500棵胡杨树进行了详细的调查。研究表明:胡杨密度随着离河岸距离增加而呈现降低的规律。不同树高的胡杨也呈一定规律分布。树高小于3m的幼树主要分布在距河道50m范围内;树高3~9m之间的胡杨在研究区中占绝对优势 ...
Bodo Coenradie   +5 more
core  

基于ART算法的运动阳极弧根电流密度分布重建研究

open access: yesGaoya dianqi, 2009
笔者提出应用ART算法根据测量得到的两个垂直方向上的弧根线性电流分布重建弧根电流密度分布的方法。对Drouet M G实验测量的弧根在2个互相垂直方向的电流分布进行计算,获得了2-D弧根电流密度分布并加以讨论。结果表明,ART重建算法结合分离极板法所测的弧根电流分布是获得其电流密度分布的一个切实可行而有效的途径。
徐铁军, 荣命哲, 吴翊, 马强
doaj  

Constructing Integrative Catalytic Pairs in Carbon Nanohorns for Enhanced Neutral H2O2 Electrosynthesis

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Electrosynthesis of hydrogen peroxide (H2O2) via the two‐electron oxygen reduction reaction (2e−ORR) offers a sustainable and decentralized alternative to the anthraquinone process. However, conventional solo‐active‐site catalysts are intrinsically limited by scaling relationships, imposing a trade‐off between activity and selectivity.
Yiqi Ding   +12 more
wiley   +1 more source

新疆地貌空间分布格局分析

open access: yes, 2009
以高分辨率遥感影像为本底数据的最新新疆地貌数据,能提高定量化地貌格局分析结果的准确性、客观性和科学性。本文利用地学统计和GIS空间分析方法,基于最新新疆地貌数据,定量化分析了地貌的分布特征、空间格局。结果表明:(1)大地貌单元中,平原地貌约占新疆总面积的1/3;(2)地势分级,中海拔地貌占绝对优势,约占全疆总面积1/2;(3)形态类型中,丘陵地貌在地势起伏中占主导地位,面积最大,主要分布在两大沙漠中,以沙丘形式分布;(4)基本地貌类型,中海拔丘陵最多,占总面积的21.417%;(5)成因类型中,流水 ...
柴慧霞, 程维明, 陈曦, 周成虎
core  

Research on Face Load Distribution for Narrow Helioal Gears

open access: yesJixie chuandong, 1994
本文用三维边界元程序计算了窄斜齿轮在不同接触线上的载荷分布,分析了齿轮齿面载荷的分布规律。同时还计算出齿轮副的平均刚度kn1和载荷分布系数Kβ计算结果表明荷载分布规律与轴向重合度εβ及传动比有关,载荷分布系数Kβ在1.04至1.23之间。
王宪法
doaj  

Enhanced Oxygen Reduction Reaction Performance of Fe‐N4 Single‐Atom Catalysts Through Fe3C Coupling

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Understanding the electronic factors contributing to the high oxygen reduction reaction (ORR) activity of Fe‐N4 sites remains a significant challenge due to the localized Fe 3d orbitals and their sensitivity to the coordination environment.
Shichang Cai   +19 more
wiley   +1 more source

国产豆科新分类群及分布新记录

open access: yes, 1998
圆柱拿身草分布新记录DesmodiumteresWal.(Cat.no.5694,1831-32,nom.nud.)exBenth.inMiq.,Pl.Jungh.225.1852,inadnota;BakerinHook.f.,Fl.Brit,In..
高信芬
core  

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