Results 51 to 60 of about 12,267 (168)
Zhejiang Daxue xuebao. Lixue ban, 2000 本文研究了聚氧化乙烯（PEO）的引入对Al(III)的水解聚合过程、成品聚合氯化铝（PAC）中铝的形态分布及絮凝能力的影响。结果表明，PEO的引入使碱滴定过程中Al(III)的水解聚合过程提前，所制得的改性PAC抗酸性增加，含有更多的不能被Al-Ferron方法所解离-络合的形态，在室温下存放更为稳定。PEO的引入能明显提高PAC的絮凝能力，加快絮体沉降速度。两种引入方法中，先加入法的效果优于后加入法。
LUJian-hang(卢建杭) +3 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
Guangtongxin yanjiu, 2020 针对水下无线光通信系统中无法兼顾聚光效率和光斑均匀性的问题,文章设计了一种复合折反式接收天线。仿真结果表明,传统的菲涅尔透镜聚光效率只有58.725%,而新设计的复合折反式接收天线聚光效率达到86.557%。在保证高聚光效率的情况下,光斑的均匀性也较好,均匀度为0.659 3。随后分析了平行光源在不同角度入射时聚光效率和光斑位置偏移的变化,发现菲涅尔透镜在入射角为2°时聚光效率就只有3.582 2%;而文章所设计的复合折反式接收天线在入射角度为1.5°时,聚光效率仍可以达到50%以上,入射角度在4 ...
贺锋涛, 韦鹏程, 张建磊
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Laser‐Driven Halide Exchange and High‐Resolution Multicolor Patterning of Perovskite Films
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Translating the excellent properties of metal halide perovskites (MHPs) into practical flexible optoelectronic devices requires high‐resolution multicolor patterning techniques that are compatible with post‐fabrication processing. However, such a capability has remained elusive.
Shu Yang +6 more
wiley +1 more source
Study on solid-state fermentation and purification of cellulase from Penicillium sp.T24-2 [PDF]
, 2008 青霉T24-2是一株具有较高固态发酵产酶能力的菌株。本文通过对青霉T24-2的固态发酵条件进行研究，确定了该菌株的最佳产酶条件为：固体培养基蔗麸比为4:6，添加0.2%尿素为氮源，按10%接种量接种种龄为18h的菌悬液，每250mL三角瓶中固体培养基装瓶量30g（干重10g），pH自然，30℃下培养3d。最佳糖化条件为：曲料比1:3,加水比1:6，在50℃，170r/min条件下糖化18h，最高糖化率可达32.4%，每100g甘蔗渣糖化液经酿酒酵母发酵后，酒精产量可达11.3g。 甘蔗渣经4 ...
王世锋
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Enzymatic Degradation of Alginate and in Vitro Immunological Activity of Its Degraded Products [PDF]
In this study, changes in the molecular mass of alginate were investigated during its enzymatic degradation and the processing parameters for the enzymatic preparation of alginate oligosaccharides were explored.
ZHANG Qian, QI Huimin, BIAN Bin, MA Junmei, LAI Chenhuan, HUANG Caoxing, LING Zhe, YONG Qiang
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Cost‐effective and efficient non‐noble‐metal catalysts for selective lignin hydrogenolysis remain elusive, representing a significant challenge in biorefinery. Here, we prepared a nitrogen‐doped carbon supported CoNi bimetallic catalyst, which was successfully derived from zeolitic imidazolate framework (ZIF) via high‐temperature pyrolysis ...
Xingwei Luo +3 more
wiley +1 more source
Contents and Structure Analysis of Tannins in Leaves of Three Cultivars of Camellia sinensis [PDF]
, 2009 测定了本山、黄旦和铁观音三个品种茶树成熟叶片的总酚及可溶缩合单宁含量,并通过基质辅助激光解吸附飞行时间质谱(MAldI-TOfMS)研究了茶叶缩合单宁的基本结构。结果显示,三种茶叶均具有较高的总酚含量,大约为200Mg/g;三种茶叶的缩合单宁是以(表)儿茶素(EC/C)和(表)棓儿茶素(EgC/gC)为基本结构单元的均聚物和杂聚物,且大部分聚合物的结构单元之间存在A型和b型两种连接方式,其中本山和黄旦缩合单宁的最高聚合度要大于铁观音。The contents of total polyphenols ...
李敏 +4 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Single‐atom catalysis hinges on fundamental challenges in precisely controlling metal‐support interactions and rationally regulating metal–adsorbate relationships. Herein, we report a universal strategy for constructing highly efficient and well‐defined Cu(I) single‐atom catalysts based on a trifurcate AlL3 molecular support.
Donghui Zhang +9 more
wiley +1 more source
Dianci bileiqi, 2005 对采用籽晶分步包膜技术制备氧化锌压敏电阻片粉体所获得的添加剂复合粉体前驱体聚沉物的干燥分解过程进行了研究。提出了采用“半干”干燥技术处理聚沉物的思路,试验证明聚沉物经清洗净化“半干”处理,即半干状态（水分约20%30%）直接煅烧分解,可以获得无团聚或弱团聚的添加剂氧化物复合粉体颗粒;煅烧分解温度与其颗粒细度密切相关,得出（600650）℃下煅烧分解效果最佳。由此得到的添加剂氧化物复合粉体与ZnO混合烧成所得压敏电阻片的电位梯度约（2郾1～2郾6）kV/cm和能量耐受能力提高近1倍的优异性能 ...
王玉平, 李盛涛
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