Results 31 to 40 of about 1,523,755 (156)
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
wiley +1 more source
, 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
core +1 more source
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
wiley +1 more source
土壤盐分和含水量的空间变异性及其CoKriging估值——以黄河三角洲地区典型地块为例
Shuitu Baochi Xuebao, 2006 以黄河三角洲地区典型地块为研究区，运用经典统计学和地统计学相结合的方法研究了不同深度土层盐分和含水量的空间变异特征。结果表明：研究区土壤盐分和含水量普遍较高，土壤表层积盐作用明显；各层土壤盐分均属于中等变异强度，土壤含水量除表层为中等变异强度外，其余各层为弱变异强度；受结构性因素和随机性因素的共同作用，各土层盐分和含水量均具有中等的空间相关性。对Kriging插值结果分析表明，研究区各土层盐分和含水量在一定的范围内均存在着空间上的相关性和变异性，表层土壤盐分和含水量的空间分布主要受微地形和气候条件的影响，
姚荣江, 杨劲松, 刘广明
doaj +2 more sources
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
wiley +1 more source
Gaoya dianqi, 2018 为了分离绝缘纸老化程度和水分对频域介电谱的影响及提高变压器绝缘纸老化程度和水分含量评估精度,文中通过开展加速热老化试验制备了老化程度和含水量均不相同的5组油纸绝缘试样,并对各组试样进行tanδ频谱测试。试验结果表明,在10-310-1Hz频段内,tanδ曲线随绝缘纸老化程度增加而上升;在10-3102Hz频段内tanδ曲线随绝缘纸含水量增大显著上升,在特征频段10-1102Hz和10-310-1Hz内求取tanδ曲线对频率的积分值Sm和SDP分别作为表征水分含量和老化程度的特征量 ...
曹建军, 隋彬, 杨飞豹, 尹小兵
doaj
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
wiley +1 more source
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
doaj
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
wiley +1 more source