Results 21 to 30 of about 188,610 (169)
He jishu采用蒙特卡罗方法模拟辐射诱导DNA损伤过程，通过获得的细胞水平数字化损伤产额评估空间辐射环境生物学效应。基于空间环境中的主要辐射来源，结合蒙特卡罗损伤模拟程序（Monte Carlo Damage Simulation，MCDS），首先针对单能状态下的质子、氦离子、碳离子、氧离子、硅离子和铁离子设置了10~105 MeV不等间隔的5个能量点，同时选择典型太阳质子事件能谱以及太阳极小时和极大时银河宇宙射线中的主要粒子能谱作为辐射源项代表，分别进行了DNA双链断裂（Double Strand Breaks ...
齐 婕, 闫 庆倩
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The analysis of decalin pyrolysis property under supercritical conditions(十氢萘的超临界裂解性能分析)
Zhejiang Daxue xuebao. Lixue ban, 2014 以十氢萘为吸热型碳氢燃料的模型化合物，研究其在550~610 ℃和0. 1~3. 5 MPa条件下的热裂解过程. 实验表明：不同温度（特别是相对较高的590和610 ℃）下，十氢萘在0. 1~2. 0 MPa压力下的转化率增加较为显著；十氢萘热裂解的主要气体产物有甲烷、乙烷、乙烯、丙烷、丙烯和碳原子数大于3的组分(C3+)等；在相同温度条件下，甲烷、乙烯的含量随压力增加而降低；乙烷、丙烷、丙烯和C3+的含量随压力增加而增加.裂解的气相产物中烯烃含量随温度升高而降低.液相产物主要包括环戊烷类、环戊烯类 ...
XINGYan(邢燕) +2 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Directed energy deposition (DED) is an effective method to process complex components with high efficiency, owing to its significant advantage of material saving and features of microarea metallurgy and rapid solidification. This study presents a nano‐Ta‐optimized Ti‐45Al‐8Nb (at%)‐based alloy synthesized via DED. The prepared TiAl‐based alloy
Yi Song +8 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT To address the demand for high‐temperature stability, broadband strong absorption, and multifunctional integration of electromagnetic wave absorbing materials in complex service environments, lightweight molybdenum disulfide (MoS2) decorated silicon carbide (SiC) nanofiber composite aerogels with a directional layered interconnected structure ...
Zhi Song +4 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT The poor soft tissue integration around titanium implants creates a microgap that serves as a pathway for pathogen invasion, resulting in infection, inflammation, and the progression of peri‐implantitis. As the implant’s transmucosal component, the abutment determines the degree of peri‐implant soft tissue attachment.
Xuan Li +7 more
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Jingshui jishu【目的】全氟和多氟烷基物质(PFASs)被广泛应用于各种工业产品和日常消费品中，已成为受到广泛关注的持久性有机污染物。环境水体中已普遍检出PFASs,人体通过饮水摄入是PFASs主要暴露途径之一，开展饮用水中PFASs赋存特征研究对于PFASs的防控至关重要。【方法】本文论述了PFASs的种类，除了包含全氟烷基羧酸(PFCAs)和全氟烷基磺酸(PFSAs)两大类传统PFASs外，还包含了新型PFASs的典型类别，并从直接排放和间接迁移两方面，对饮用水中PFASs的污染来源进行分析 ...
Yongyan CHEN +5 more
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Zhongguo youzhi旨在为河北省食品安全风险监测工作提供数据基础，对河北省市售食用植物油中3-氯丙醇酯（3-MCPDE）及2-氯丙醇酯（2-MCPDE）的污染状况进行调查分析，并开展不同人群风险暴露评估。在河北省11个地市采集6种食用植物油样品共145份，以同位素稀释-气相色谱-质谱联用法对3-MCPDE和2-MCPDE进行定量，并采用目标危害系数法对河北省2～3岁、4～6岁、7～10岁、11～17岁、18～29岁、30～44岁、45～59岁、60～69岁、70岁及以上人群经食用植物油摄入氯丙醇酯的风险进行评估。结果表明 ...
刘印平, 云鹏, 陈福尊, 董彬, 杨立新LIU Yinping,YUN Peng, CHEN Fuzun, DONG Bin,YANG Lixin
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Effect and Mechanism of Loquat Leaf Extract Combined with Exercise on Lipid Metabolism in High-Fat Diet Induced Mice(枇杷叶提取物联合运动对高脂饮食小鼠脂质代谢的影响与机制分析) [PDF]
Shipin kexue jishu xuebaoIn order to study the effect of loquat leaf extract (LLE) combined with exercise (Ex) on lipid metabolism, mice were divided into normal diet group, high-fat diet group, Ex intervention group, LLE intervention group and LLE-Ex intervention group.
REN Yijing(任以静) +5 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Metal‐organic frameworks (MOFs) hold significant potential across numerous advanced disciplines due to their exceptional properties, including high specific surface area, tunable porosity, structural diversity, and customizable functionality. Increasing attention has been directed toward employing MOFs in coatings that offer both antimicrobial
Yanchun Zhao +7 more
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Zhongguo cuzhong zazhi目的 分析2002—2021年上海市脑血管病死亡率变化趋势及其对期望寿命的影响，为制订脑血管病精准防控策略提供依据。 方法 利用上海市疾病预防控制中心死亡登记信息系统收集2002—2021年上海市户籍居民脑血管病死亡数据，运用Joinpoint回归模型分别描述全人群、不同性别、不同年龄组、不同地区、不同分型脑血管病死亡率的变化趋势。采用Arriaga寿命表分解法，量化不同年龄组及不同性别急性脑血管病与脑血管病后遗症死亡率下降对期望寿命增长的贡献。 结果 2002—2021年 ...
蔡任之, 邵海妍, 陈蕾, 钱耐思, 李琦, 晋珊, 杨之雨, 虞慧婷CAI Renzhi, SHAO Haiyan, CHEN Lei, QIAN Naisi, LI Qi, JIN Shan, YANG Zhiyu, YU Huiting
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