Results 41 to 50 of about 1,240,284 (143)
Gongye shui chuli, 2022 为获得低成本、高效率的偶氮染料废水处理方法，采用改性活性炭催化过硫酸盐（PS）氧化降解甲基橙染料废水。通过单因素实验分别研究改性活性炭、PS及Fe2+浓度对甲基橙降解的影响，降解过程遵循拟一级动力学模型，反应速率常数为0.075 7~1.717 8 min-1。采用Box-Behnken Design响应面研究各因素及其交互作用对甲基橙降解的影响，各因素贡献排序为：催化剂投加量>PS浓度>Fe2+浓度，最佳反应条件：催化剂投加量为0.73 g/L、PS浓度为2.0 mmol/L、Fe2 ...
赵娟娟 +6 more
doaj +2 more sources
Zhongguo shiyan zhenduanxue, 2002 目的 证实西比灵对急性脑梗死患者血清中自由基的影响。方法 选取急性脑梗死患者 ,随机分为一般治疗组、自由基清除剂治疗组、西比灵治疗组、自由基清除剂加西比灵治疗组 ,对各组患者于治疗前后进行疗效评定 ,于治疗前、治疗后 3、7、15d分别采静脉血 ,应用WSPS法测定LPO含量 ,化学发光法测定SOD活性。结果 西比灵治疗组LPO含量降低 ,SOD活性稳定 ,自由基清除剂加西比灵组LPO含量降低更加明显。结论 西比灵可抑制脑梗死患者脑组织内自由基的生成 ,与自由基清除剂联合应用疗效更加显著 ...
刘松岩 +4 more
doaj
Ultrasonic Vibration Assisted Laser Processing: A Hybrid Paradigm for Extreme Surface Enhancement
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Traditional laser processing techniques offer many advantages, but they often encounter limitations such as heat‐affected zones, recast layers, residual tensile stresses, and poor surface finish. The integration of ultrasonic vibration (UV) presents a promising hybrid approach to overcome these challenges by introducing beneficial effects like
Aziz Ul Hassan Mohsan +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Carbides strengthen the grain boundaries; nevertheless, excessive carbide precipitates embrittle the grain boundaries of high‐temperature alloys during prolonged service. Here, we provide direct evidence of solute rare‐earth atoms and demonstrate that they can trap vacancies and inhibit interstitial diffusion, restraining carbide precipitation
Jiali Zhang +10 more
wiley +1 more source
自由基捕捉剂结构对
Fushe yanjiu yu fushe gongyi xuebao探究了N，N-二仲丁基对苯二胺（44PD）、特丁基对苯二酚（TBHQ）、二硫化二异丙基黄原酸酯（DIP）三类自由基捕捉剂对γ射线辐照作用下乙烯-醋酸乙烯共聚物（EVA）结构演化与性能变化行为的影响。热重分析（TGA）结果表明，三类自由基捕捉剂可抑制较高吸收剂量下EVA中聚乙烯链段的裂解。凝胶含量及应力松弛测试结果表明，三类自由基捕捉剂均可抑制EVA内部交联结构的构筑，其中，胺类抗氧剂44PD的抑制效果相对不明显，但吸收剂量较高时，含自由基捕捉剂的EVA，其交联结构较为完善，应力松弛速率较低 ...
胡 心芸 +6 more
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Zhejiang Daxue xuebao. Lixue ban, 2019 采用密度泛函理论的B3LYP 方法、微扰理论的MP2 方法和自洽反应场（SCRF） 理论的SMD 模型方法，研究了水环境下羧基与氨基间为单氢键的α-Ala 旋光异构及羟自由基和氢氧根作用的反应。研究发现：α- Ala 的旋光异构可在a 和b 两个通道实现，a 通道为羧基顺反异构后，水分子簇作媒介质子以氨基为桥从α 碳的一侧向另一侧迁移；b 通道为水分子簇作媒介，质子从α 碳向氨基氮的迁移与羧基顺反异构协同进行。在a 通道，羟自由基水分子簇可致α-Ala 损伤。势能面计算表明：水环境下，在a 通道3 ...
YANHongyan(闫红彦) +3 more
doaj +1 more source
Functionalized Silica‐Constructed Self‐Supporting Composite Separator for Lithium Metal Batteries
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Lithium metal batteries (LMBs) are considered highly promising next‐generation energy storage systems owing to their exceptionally high theoretical specific capacity and ultralow electrochemical potential. Nevertheless, the practical deployment of LMBs is still severely restricted by the uncontrollable formation and propagation of lithium ...
Li Chen +6 more
wiley +1 more source
四川大学学报. 自然科学版, 2006 运用群论和原子分子静力学方法,推导了SiH(SiD)自由基分子基态的合理离解极限.采用多种方法和基组组合优化计算了SiH(SiD)自由基分子基态的平衡结构,振动频率和离解能.使用二次组态相互作用方法QCISD(T)结合6-311++g(3df,3pd)基组对SiH(SiD)自由基分子基态进行了单点能扫描计算.对标准的Murrell-Sorbie函数进行修正,用最小二乘法分别拟合Murrell-Sorbie函数和修正的Murrell-Sorbie函数得到了SiH(SiD ...
宋晓书 +4 more
doaj
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Overcoming the strength–ductility trade‐off in face‐centered cubic (FCC) multi‐principal element alloys (MPEAs), particularly at cryogenic temperatures, remains a significant challenge. Here, a laser powder bed fusion (LPBF)–enabled direct aging strategy is employed to modify the precipitation behavior in a Ni53Fe20Cr23Nb4 (at%) alloy.
Xiaohui Qin +8 more
wiley +1 more source