Results 11 to 20 of about 58,934 (163)

改性聚天冬氨酸的缓蚀性能及机理研究

Gongye shui chuli, 2012
通过傅立叶红外光谱、旋转挂片法、极化曲线法、交流阻抗法研究了醇胺开环改性聚天冬氨酸的缓蚀性能及缓蚀机理。研究表明,乙醇胺、二乙醇胺、三乙醇胺开环改性PASP中以加入乙醇胺所得改性产物的缓蚀性能最好,缓蚀率达到70.18%。醇胺改性的PASP是一种以抑制阳极为主的缓蚀剂。
和欢芹, 侯永江, 何丽, 国洁, 杨翠花, 李薇, 蔡玉喜, 程俊杰, 郝彦龙   +8 more
doaj   +2 more sources

Identify the characteristic aroma components of Longjing tea by headspace steam distillation extraction and GC-MS/GC-O(顶空蒸馏萃取法结合GC-MS/GC-O技术分析龙井茶的特征香气成分)

Zhejiang Daxue xuebao. Lixue ban, 2015
采用顶空蒸汽蒸馏萃取法提取龙井茶的香气成分，以气相色谱-质谱联用(GC-MS)结合气相色谱-嗅闻(GC-O)技术，对龙井茶的特征香气成分进行了分离鉴定.共鉴出75种香气成分，其中醇类24种，醛类8种，酮类10种, 酯类6种，杂环类16种，其他11种.采用气相色谱-嗅闻(GC-O)结合芳香萃取物稀释分析(AEDA)技术分离出49种活性香气成分，其中对龙井茶香气贡献较大的有橙花叔醇、二氢猕猴桃内酯、2-乙基吡嗪、2-乙酰基呋喃、芳樟醇、1-乙基-2-甲酰基吡咯、环氧芳樟醇、水杨酸甲酯、苯甲醇、苯乙醇、吲哚 ...
XIAOZuobin(肖作兵), CHENHexing(陈合兴), NIUYunwei(牛云蔚), WUMinling(吴旻玲), SHUChang(舒畅), ZHUJiancai(朱建才)   +5 more
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Multifunctional Hydrogels Based on MXene@NiFe2O4 Conductive‐Magnetic Composites for Electromagnetic Shielding, Thermal Insulation, and Wearable Sensors

Rare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Traditional electromagnetic shielding materials mainly focus on attenuating electromagnetic interference (EMI), but they still fail to meet the growing demands of modern flexible electronic devices and Internet‐related information technologies.
Zhi Lei, Maoxia Lu, Bin Yang, Dongju Liu, Daohai Zhang, Chang Li, Wei Gong   +6 more
wiley   +1 more source

Determination of monoethanolamine, diethanolamine and diethanolmethylamine in the absorption liquid of CO2 by ion chromatography with charged aerosol detector(离子交换电雾检测测定CO2吸收液中一乙醇胺、二乙醇胺、N-甲基二乙醇胺)

Zhejiang Daxue xuebao. Lixue ban, 2011
建立了阳离子交换-电雾检测器测定CO2吸收液中一乙醇胺、二乙醇胺、N-甲基二乙醇胺的分析方法.实验采用IonPac CS17阳离子交换柱，选用甲酸与乙腈溶液为淋洗液，并考察了色谱柱种类、淋洗液种类与浓度对分离测定有机醇胺的影响.所测3种有机醇胺的检出限分别为0.21、0.04、0.32 µg • mL-1，线性范围在1.0~100 µg • mL-1，相关系数分别为0.999 6、0.999 3和0.999 2，加标回收率为87%~98%.用所建立的方法测定了CO2吸收液中有机胺质量浓度，结果令人满意.
YEMing-li(叶明立), CHENYu(陈郁)
doaj   +1 more source

Dual‐Bioactive Lignin‐Based Microcarrier Hydrogel Platform via Metal Salt Crosslinking for Synchronized Infection Eradication and Bone Regeneration

Rare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Infected bone defects represent a dual therapeutic challenge demanding concurrent infection inhibition and osteogenesis promotion. Systemic antibiotic administration is taken as a classical treatment protocol but often yields inadequate local antibiotic concentrations and delayed bone repair.
Xucai Wang, Yuxiang Fei, Zhenbo Yuan, Qiuyang Wang, Haojun Chen, Peng Wang, Weijun Wang, Wenbo Chen, Caoxing Huang   +8 more
wiley   +1 more source

Synergy Effects of Dual‐Gel‐Assisted Structural Engineering and Bimetallic Doping Regulation Realize Ultrastable High‐Rate Performance of NASICON Cathodes for Sodium‐Ion Batteries

Rare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Na‐superionic‐conductor‐type (NASICON) Na4MnV(PO4)3 (NMVP) is an appealing cathode for sodium‐ion batteries (SIBs), but its application is hindered by Jahn–Teller distortions, sluggish Na+ kinetics and poor conductivity, leading to rapid capacity fade.
Huan Liu, Xiao‐Jie Zhang, Jing‐Quan Li, Yu‐Xin Ding, Qing‐Quan Liu, Hai‐Yan Wang, Chu‐Cheng Luo, Zhi‐Hua Zhou, Xiao‐Bing Huang   +8 more
wiley   +1 more source

醇胺类的生物降解动力学及其对活性污泥法影响研究

Gongye shui chuli, 2013
实验研究了醇胺类有机物的可生物降解性、降解反应动力学及其对活性污泥法的影响。结果表明:乙醇胺的生物降解反应速率常数(k)为0.1550,去除率达到90%以上;二乙醇胺和N-甲基二乙醇胺的生物降解反应速率常数分别为0.0641和0.0539,去除率均达到60%以上;三乙醇胺的生物降解反应速率常数为0.0124,去除率仅为23%。少量N-甲基二乙醇胺的冲击不会对活性污泥法的出水水质造成明显影响,大量冲击虽然会在短期内影响出水水质,但不会对活性污泥法产生不可逆转的破坏作用。
吴颖, 郦和生, 王岽, 王洪英
doaj   +2 more sources

Spatiotemporally Adaptive Bilayer Silk Fibroin–Polyvinyl Alcohol–Metformin Composite Coating on Biodegradable Zinc for Orthopedic Applications

Rare Metals, Volume 45, Issue 7, July 2026.
ABSTRACT Biodegradable zinc (Zn)‐based materials are considered promising candidates for orthopedic applications because of their favorable mechanical properties, controllable biodegradability, and good biosafety profiles. However, their clinical translation is limited by early‐stage corrosion‐induced cytotoxicity and inflammation, as well as ...
Jinlong Mao, Wentai Zhang, Jingtao Dai, Zhaozhao Zhang, Junyu Qian, Jinjing Liu, Wenjie Tao, Yuanhao Wang, Dorothea Alexander, Guojiang Wan   +9 more
wiley   +1 more source

Preparation of Highly Bioactive Nanolignin via Dopamine Mannich Modification and Its Synergistic Effects With Zn2+ in PVA Hydrogels

Rare Metals, Volume 45, Issue 7, July 2026.
ABSTRACT Lignin is a natural non‐toxic polyphenolic macromolecule, which shows inherent antioxidant and broad‐spectrum antibacterial activities. However, due to the low content and the high bond dissociation energy of phenolic hydroxyl groups (Ar‐O·H), its antioxidant and antibacterial activities are relatively weak, which limits its application as a ...
Meiling Han, Hui Hui, Yi Yang, Yan Wang, Danli Zhou, Yuebin Xi, Yu Jing, Pingxian Feng, Fan‐Gong Kong, Huan Wang, Weijun Yang   +10 more
wiley   +1 more source

雌甾酰化衍生物的薄层色谱

四川大学学报. 自然科学版, 1981
将雌二醇与乙酸氯,无水三氯化铝反应,除生成2-乙酰基-雌二醇17β-乙酸酯外,尚有多种付产物.为了解反应进行情况并解决产物的分离,考查雌甾酰化衍生物——雌二醇3-乙酸酯,雌二醇17β-乙酸酯,雌二醇3,17β-二-乙酸酯,2-乙酰基-雌二醇17β-乙酸酯以及2-乙酰基-雌二醇3,17β-二-乙酸酯等的薄层色谱是必要的.这一系列化合物的薄层色谱分离还未见文献报道.
谢如刚
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