Results 21 to 30 of about 1,537,373 (154)
, 1989 本文总结了武汉东湖水体中磷含量(均以PO_4计算)的周年逐月季节和年际变动及其分布上的差异(1973—1985年)。按面积加权法计算总磷的平均含量为0.244毫克/升(1983—1985年),总溶解磷和溶解活性磷的平均含量分别为0.121毫克/升和0.051毫克/升(1981—1984年)。总磷和总溶解磷周年中出现两次高峰含量,即春季(3—5月)和夏末秋初(8—9月)。低含量出现在水温最低的冬季(12—2月 ...
刘衢霞, 华俐, 张水元
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Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, Volume 40, Issue 3, June 2026.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The engineering application of traditional nano‐bainite steel, also known as low‐temperature bainite steel, has been restricted due to its relatively low toughness and the prolonged isothermal transformation time during manufacturing processes.
Jin‐Zhou Zhang +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 5, May 2026.ABSTRACT Thermo‐responsive hydrogels based on poly(N‐isopropylacrylamide) (PNIPAM) are promising candidates for soft actuation, yet their practical applications are often constrained by sluggish thermo‐responsive kinetics and insufficient mechanical robustness.
Hui Liu +5 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Water pollution is becoming increasingly severe, posing a serious hazard to human health and ecological security. Therefore, it is necessary to develop rapid, sensitive, and universal analytical methods to detect residual pollutants in actual water.
Yi Xing +4 more
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Shuitu Baochi Xuebao, 2001 坡向和坡位对林地土壤水分有一定影响.林分相同时,阴坡林地的土壤水分含量高于阳坡. 阴坡河北杨林、柠条灌木林和沙棘灌木林的土壤水分含量分别比阳坡高约2.53%～3.20%,0.7 7%～1.01%和2.35%.坡向和林分相同时,坡下部林地的土壤水分含量相当于、略高于或明显高于坡上部和中部.阴向峁坡下部柠条灌木林的土壤水分含量与峁顶、峁坡上部和中部无明显差异;东坡和西北坡下部油松林的土壤水分含量比坡上部仅分别高0.95%, 1.46%(4月)与1.28%,0.35%(6月 ...
王孟本 李洪建
doaj
Shuitu Baochi Xuebao, 2020 为揭示水耕年限对小麦生产的影响，在江汉平原选取了3种水耕年限（2年、18年、>100年）稻—麦轮作农田，采集了小麦各生育期的土壤样品与成熟期的小麦植株样品，测定了土壤水分、硝态氮含量、铵态氮含量和小麦产量等指标，分析了土壤剖面水—氮动态分布与积累特征，及其对小麦产量的影响程度与机制。结果表明：（1）随水耕年限延长，土壤水分和氮素含量显著增加。水耕2年、18年和100年农田的0—100 cm深度剖面平均体积含水量分别为0.36，0.39，0.42 cm3/cm3。硝态氮和铵态氮在0—20 cm土层富集 ...
段赫 +5 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Interface polarization enhancement and impedance matching optimization are the keys to improving the comprehensive performance of microwave absorbing materials (MAMs). Herein, a green synthesis strategy integrating sacrificial template self‐etching, hydrothermal reaction, and annealing treatment is proposed to successfully fabricate urchin ...
Zhenzhen Tian +8 more
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, 2012 一种油、气、水多相流量计，包括：水力旋流器，气液缓冲罐，主分离罐，气体测量管路，油相、水相测量管路和控制系统；所述气液缓冲罐和主分离罐分别与水力旋流器相连，气体测量管路一端与气液缓冲罐相连，另一端与下游管道相连；两个液体测量管路的一端与主分离罐相连，另一端均与下游管道相连；油气水混合液经过水力旋流器处理后，所排出的气体经过气液缓冲罐进入到气体测量管路，对混合液中的气体含量进行测量。所排出的油水混合液通过管道进入到主分离罐中，并在主分离罐中通过重力，将混合液中的油和水分离开，分离出的油 ...
许晶禹 +4 more
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