Results 61 to 70 of about 1,133,740 (188)
, 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
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT To improve the strength–toughness balance of IN718, and alleviate the brittleness commonly associated with refractory high‐entropy alloys, this study proposes a novel strategy to fabricate defect‐free IN718/WMoTaNb heterogeneous multiprincipal element alloy coatings via laser‐directed energy deposition.
Zhao Wang +7 more
wiley +1 more source
野生动物学报, 1994 貉貉（ＮｙｃｔｅｒｅｕｔｅｓＰｒｏｃｘｏｎｏｉｄｅｓＧｒａｙ）属于食肉目犬科。主要分布于亚洲东南部。在原苏联分布在黑龙江流域、乌苏里江流域向北分布到萨哈林半岛。在中国分布在东北、华北、华中、华南和西南地区一直延伸到越南北部。在日本和朝鲜半岛也有分布。...
高犁为
doaj
, 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
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT The deformation behavior of NiTiNb shape memory alloys is governed by microstructural heterogeneity, specifically the interconnected topology of the β‐Nb phase. The regulatory role of the eutectic structure in load partitioning and the evolution of deformation mechanisms, particularly in high‐Nb systems, has not been clearly understood.
Qingda Zhang +11 more
wiley +1 more source
Research on Face Load Distribution for Narrow Helioal Gears
Jixie 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
, 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
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Aqueous Zn‐ion batteries (AZIBs) are expected to become one of the most promising candidates for large‐scale energy storage, but are impeded by uncontrollable dendrite growth and parasitic reactions. In this study, we propose a simple mechanical shot‐peening (SP) approach for restructuring commercial Zn foils into highly exposed (002)‐textured
Xu Ma +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 1995 对中国降雨侵蚀力Ｒ值的计算与分布进行了系统研究。主要内容包括Ｒ指标的确定；次降雨Ｒ失真、Ｒ值以及多年平均Ｒ值的简易计算方法；我国不同地区年Ｒ值的月分布、次分布、频率分布和年际变化特征，以及Ｒ值的雨量、雨强分布特征；对我国１４０多个重点站的Ｒ值进行了计算；在分析我国降雨侵蚀力Ｒ值区域分布特征的基础上，编制了中国降雨侵蚀力等值线图，进行了降雨侵蚀力分区。
王万中 张宪奎
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Heterogeneous structures have demonstrated great potential for overcoming the long‐standing strength–ductility trade‐off in metallic materials. In this study, a novel dual‐gradient structure, characterized by gradients in both grain size and precipitate distribution, was successfully constructed in an Mg–2Zn–0.8Gd (wt%) alloy sheet via sliding
Chunquan Liu +4 more
wiley +1 more source