Results 11 to 20 of about 1,146,322 (163)
Relationship between elements in the absorption and purification(富营养化水体中植物的元素吸收与净化能力的关系)
Zhejiang Daxue xuebao. Lixue ban, 2002 研究了不同植物在两种程度富营养化水中对元素的去除率及对富营养化成分的去除率.在重度富营养化水中,蒸腾强度高的植物对水中各成分均具较好的净化效果;而在轻度富营养化水中,所研究的植物间没有共同趋势.另外,可根据不同植物对环境的各自适应方式将其用于净化不同类型的污水.其中,灯芯草和空心菜不需元素补给,在重度和轻度富营养化水中均具较好的净化能力;鸭跖草是耐阴植物,有适度遮荫时净化效果较好;菩提子用于净化重度富营养化水时需补给适量的常量营养元素;芦苇在轻度富营养化水中净化能力较好 ...
GUANBao-hua(关保华) +6 more
doaj +1 more source
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Ultrathin, lightweight, and mechanically compliant electromagnetic interference (EMI) shields are increasingly required for high‐frequency electronic devices. However, conventional metallic shields predominantly rely on conductivity‐driven reflection mechanisms, which become ineffective at reduced thickness and may cause severe secondary ...
Zida Zhang +7 more
wiley +1 more source
Coupled Structural Characteristics Boost Brazing Performance of Ti2AlNb Alloy
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Brazing of Ti2AlNb alloy is a pivotal technique for new generation aero‐engine lightweight structures, yet developing novel filler metal and achieving the extraordinary performance of titanium alloy brazed joints remains challenging. Here, this study designed an innovative filler metal (Ti70‐xZrxCu15Ni15) and developed inspired coupled ...
Yinchen Wang +13 more
wiley +1 more source
, 2011 新能源汽车是我国 十二五 期间重点发展的战略新兴产业之一, 轻量化材料的发展对新能源汽车的发展起到 很重要的作用。本文利用文献计量、数据对比、数值模拟计算等分析方法, 对2000 年以来我国及中国科学院的新能源汽车及轻 量化材料科技成果产出数量、年度分布等进行计量分析。尤其对碳纤维、碳纳米管和树脂科技成果的年度发展态势、完成地域 分布、主要完成机构等变化规律进行分析比较, 揭示了新能源汽车及其轻量化材料科技成果的现状 ...
吕鹏辉 +4 more
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Journal of Adolescence, Volume 98, Issue 5, Page 1715-1736, July 2026.ABSTRACT Introduction Following rapid iterations in media technologies, Chinese millennials (born between 1980 and 1995) find themselves in a paradoxical state where digital saturation exists alongside fatigue, making them central practitioners of digital minimalist behavior.
Chao Zhang, Yinze Hao, Jingwen Li
wiley +1 more source
, 1992 一种轻烃催化转化制取低碳烯烃的方法是采用含有周期表ⅠＡ、ⅡＡ，第四周期，Ｍｏ、Ｌａ或Ｃｅ中一种或几种元素为活性组分的ＺＳＭ沸石催化剂，在同一反应中使轻烃进化催化氧化脱氢裂化反应制取低碳烯烃。该技术适用于从较难裂化的低碳烷烃制取乙烯和丙烯，它比一般液态烃热解制烃的温度低１５０～２００℃，且烯烃选择性好，收率高。同时由于催化剂制备过程进行硫化处理，催化剂催化性能稳定，寿命长 ...
谢茂松 +5 more
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Shuitu Baochi Xuebao, 2022 探讨黄土旱塬冬小麦区不同有机肥替代化肥氮对小麦产量及土壤碳氮组分的影响,为该区减施化学氮肥、促进小麦提质增效和农业绿色可持续发展提供理论依据。于2019年在山西黄土旱塬冬小麦种植区设置100%化肥N处理(HF)、10%腐殖酸N+90%化肥N (F1)、30%腐殖酸N+70%化肥N (F3)、50%腐殖酸N+50%化肥N (F5)、10%有机肥N+90%化肥N (Y1)、30%有机肥N+70%化肥N (Y3)、50%有机肥N+50%化肥N (Y5)7个试验处理,系统研究了不同比例腐殖酸 ...
姜丽伟 +6 more
doaj +2 more sources
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT The development of lightweight, high‐attenuation, and broadband carbon‐based electromagnetic wave absorbers is hindered by the intrinsic trade‐off between impedance matching and dielectric dissipation. Herein, we report a facile and scalable synthesis of N‐doped lignin‐derived interconnected porous carbon (Nx‐LIPC) via hydrogen‐bond self ...
Bin‐Peng Zhang +7 more
wiley +1 more source
, 2006 本发明涉及一种用于轻质油氧化脱臭催化剂及制备方法，其步骤为： a)搅拌下将钨酸钠的溶液加入到含有金属阳离子Mn+的稀硝酸中；b)加入 1/5～1/10(摩尔比)钨量的季铵盐，搅拌6-12小时，过滤，得目标产物或者于40-60℃干燥。其中季铵盐为分子中至少有一个基团的碳链长度大于或等于8个碳原子的表面活性剂。本发明工艺简单、易行，投资极少，对轻质油脱臭速度极快，效率极高；催化剂难溶于油，不污染油品，易于从油相分离出来以便于回收使用，且本方法环境友好，不污染环境 ...
蒋宗轩, 李 灿, 景 飞
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