Results 11 to 20 of about 571,798 (171)
, 2019 利用木质素大分子与双酚A相似性,采用木质素替代双酚A制备环氧树脂可减少化石原料双酚A的使用。采用衣康酸助催化高温液态水耦合酶催化水解法提取人工林剩余物―桉木的木质素。电子扫描电镜SEM检测表明:木质素分子量颗粒分布均一,木质素含量97.6%,酚羟基含量1.48 mmol/g。利用木质素与双酚A结构相似,在碱催化下与环氧氯丙烷反应合成木质素基环氧树脂。傅立叶红外光谱检测表明,氢氧化钠催化下发生了化学反应,生成了环氧基,环氧值为0.36 mol/100g。热失重TGA分析显示:双酚A环氧树脂失重发生在314.
苗长林 +4 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Metal nanoclusters provide abundant catalytically active sites and unique electronic structures that are highly beneficial for enhancing photocatalytic performance; however, their practical application is often hindered by poor photostability.
Yiying Qin +6 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Advanced metallic glasses, leveraging their ultrahigh strength, excellent corrosion resistance, superior soft magnetic properties and good biocompatibility, have gradually become indispensable strategic cornerstones in critical fields such as aerospace, electronic information and energy power. This unique combination of properties enables them
Yizhou Liu +11 more
wiley +1 more source
Salting-Out Assisted Liquid-Liquid Extraction Coupled to UPLC-MS/MS for Determination of Tetracyclines in Milk Powder(盐析液液萃取-超高效液相色谱-串联质谱法测定奶粉中四环素类抗生素) [PDF]
Shipin kexue jishu xuebao, 2019 The use of salting-out assisted liquid-liquid extraction (SALLE) combined with UPLC-MS/MS has been evaluated for the determination of tetracyclines in milk powder.
LUO Ruilian(罗瑞涟)
doaj +1 more source
Collaboration in Cross‐Jurisdictional Water Quality Governance: A Novel Framework and Case Study
World Water Policy, Volume 12, Issue 3, August 2026.ABSTRACT Collaborative governance is often employed to address the inherent complexity of surface water quality governance and provides a structure for cooperation across federal, tribal, state, and local boundaries. However, although guidance exists for assessing specific dimensions of collaborative governance, tools to comprehensively evaluate the ...
Kinsey Ayers, Julie Padowski
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Gongye shui chuli, 2017 以农业废弃物玉米苞叶为原料，用氯氧化锆对其进行改性，用于去除水体中的四环素。采用SEM、FTIR对改性前后的玉米苞叶进行了表征，并研究了溶液初始pH、温度等因素对四环素吸附的影响。结果表明：改性过程使玉米苞叶表面结构发生变化，显著提高了其对四环素的吸附量。在30℃，四环素溶液初始pH=5的条件下，吸附量为54.1 mg/g。在293~313 K的温度范围内，吸附量随温度的升高而升高，等温吸附曲线符合Freundlich模型；吸附过程符合伪二级动力学模型。
宋端梅 +4 more
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Policy Studies Journal, Volume 54, Issue 3, August 2026.ABSTRACT This study introduces a dual‐layer protocol for diagnosing how formal institutional designs are implemented in practice in complex governance systems. The protocol builds two linked process maps; one for the formal rules and procedures (rules‐in‐form) and one for the routines actors actually follow in practice (rules‐in‐use).
Sina Jangjoo +7 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Developing advanced electrocatalysts for urea synthesis is pivotal to alleviating environmental burdens as well as advancing sustainability in the industrial and agricultural sectors, yet untargeted catalyst screening still suffers from the notorious drawbacks of being time‐consuming, labor‐intensive, and inefficient.
Xinyuan Yang +8 more
wiley +1 more source
, 1997 四环素类抗菌素的碱性溶液(kOH)在沸水浴中加热一定时间而发生降解,其降解物的荧光激发光谱和发射光谱均发生改变,且荧光强度较四环素类抗菌素本身的天然荧光增强5~190倍,认为发生了分子内亲核断环反应,生成具有内酯结构的降解物,此降解物内酯结构中氧原子上孤对电子与共轭π电子相互作用.使分子中共轭电子体系的离域性增大,荧光增强.国家自然科学基金 ...
常文保, 赵一兵, 慈云祥
core
Journal of Animal Ecology, Volume 95, Issue 7, Page 1178-1193, July 2026.This population‐comparative study reveals that male and female parents respond differently to social and ecological conditions. This sex‐specific responsive strategy is related to the incongruent parental care systems across populations in Chinese penduline tits.
Jia Zheng +5 more
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