Results 21 to 30 of about 1,333,200 (165)
Shuitu Baochi Xuebao, 2022 作为黄河流域典型生态脆弱区之一的砒砂岩区,水土流失治理难度大,区域地形、侵蚀在坡沟系统的分布迥异。区域土壤侵蚀研究多集中于刻画侵蚀空间分布及不同地类差异性研究,从坡沟系统细化开展研究工作较少,不能较好地为后续精细化治理提供支撑。因此,选取位于准格尔旗的3个典型砒砂岩区小流域,结合目视解译的流域沟沿线,开展了流域地形、水力侵蚀分布规律及其关联性研究。结果表明:流域地形因子分布特征与地貌特征分布一致,高值集中分布在沟道,低值则集中在坡面,且特拉沟小流域(覆沙)沟道处的地形因子统计值最大 ...
谢梦瑶 +5 more
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Dizhen xuebao, 2023 针对2011年提出的两步差法在地震微波异常提取中的不足，提出了改进两步差法，该方法通过使用层次聚类和小波分析两种算法，克服了原方法中未考虑不同地物类型引起的亮温差异、亮温背景场不够稳健等问题，从而使异常结果在空间形态和异常幅度上更加合理，并将该方法应用于2021年5月22日青海省玛多县MS7.4地震的微波异常提取。结果显示，玛多地震前三个月出现了一条长约900 km、增温幅值达12 K的NE向亮温增温条带，与2010年4月14日MS7.1玉树地震前异常特征在空间分布和演化特征上均有很高的相似性。此外 ...
Shanjun Liu +3 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Refractory high‐entropy alloys (RHEAs) face severe oxidation challenges at elevated temperatures, despite their outstanding mechanical properties. Consequently, understanding the oxidation mechanisms of RHEAs is crucial for their high‐temperature applications.
Zheng Tian +7 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Composite materials hold significant potential for abrasive sealing, yet composite materials used for abrasive sealing fall short in service durability under extreme environments. Here, a controllable strategy for adjusting pore structure is proposed, aiming to design a YSZ(ESP)/BN@ZrO2‐polyester coating with hybrid micron/nanometer ...
Shuang Yu +8 more
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Piezocatalysis has garnered unprecedented research enthusiasm for applications in energy and environmental fields, as it can harvest the tiny vibration energy from the natural environment and convert it into electrical energy to drive catalytic reactions.
Feixue Gao +9 more
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT This study presents an assessment of four representative expansive additives—calcium sulphoaluminate–calcium oxide, magnesium oxide, sodium lauryl sulfate, and sodium abietate—and their effects on the expansion behavior, mechanical development, and microstructural characteristics of cemented paste backfill (CPB).
Lijie Guo +5 more
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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
Shuitu Baochi Xuebao, 2023 为减少坡耕地作物播种至出苗期间的水土流失,通过模拟降雨试验研究不同播种方式形成微地形对水土流失的影响,共设置6个处理,T1处理为深开沟播种(沟深20 cm),T2处理为浅开沟播种(沟深10 cm),T3处理为塘播,T4处理为起高垄播种(垄高20 cm,宽30 cm),T5处理为起低垄播种(垄高10 cm,宽15 cm),T6处理为无处理直接播种(空白对照),各处理分别以10°,15°,20°坡度在40,80,120 mm/h雨强下进行27场模拟降雨试验。结果表明:开沟和起垄播种处理都能有效减轻水土流失 ...
朱上卿 +6 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi +5 more
wiley +1 more source
2021年5月21日漾濞MS6.4地震极震区地形效应对地震动特性的影响
Dizhen xuebao基于对2021年5月21日漾濞MS6.4地震微观震中秀岭村进行的震害调查，利用流动观测地形台阵观测资料，分析了地形效应对地震动特性的影响。结果表明，若地震波垂直山脉走向入射，陡坡会放大地震波的高频部分，且不同高程处，山脉垂向低频差异较大，山脉走向低频差异较小。利用谱衰减法计算高频衰减参数的场地影响项κ0，分析了水平和竖向分量的κ0与场地软弱程度和卓越频率的相关性，其结果表明，在小尺度范围内，水平分量和竖向分量的κ0均具有较强的空间不均匀性。
Libao Zhang +6 more
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