Results 21 to 30 of about 3,991,776 (211)
两步法精制生物柴油工艺流程模拟Simulation of two-step process for refining biodiesel
Zhongguo youzhi, 2022 以油酸和三油酸甘油酯混合物（酸值(KOH)42.52 mg/g）为原料，利用两步法生产精制生物柴油。采用Aspen Plus V10软件对整个工艺流程进行模拟，先以超声辅助低共熔溶剂酶法制备粗生物柴油，再以乙醇、甘油等为携带剂精馏分离游离脂肪酸，并对精馏工艺进行优化。结果表明：制备粗生物柴油过程中油酸和三油酸甘油酯转化率分别为88.19%与 92.71%，粗生物柴油酸值（KOH）为5.07 mg/g；最佳精馏工艺条件为压力0.9 MPa、回流比0.7、理论塔板数31、粗生物柴油进料为第14块塔板 ...
张旗，郝小红，索航，杜肃ZHANG Qi，HAO Xiaohong，SUO Hang，DU Su
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International Insolvency Review, EarlyView.Abstract Although a local experiment, the promulgation of the Regulations of Shenzhen Special Economic Zone on Personal Bankruptcy (SPBR) in 2020 was hailed as a significant milestone in China's insolvency lawmaking which has thus far addressed only corporate insolvencies.
Jenny Fu, Jin Chun
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He jishu放射性核素在膨润土上的分配系数（Kd）是放射性废物处置库安全评价中的关键参数之一。本研究旨在使用机器学习（Machine Learning，ML）模型可靠地预测多种放射性阳离子在膨润土中的Kd值。该研究基于日本原子能机构吸附数据库（Japan Atomic Energy Agency's adsorption database，JAEA-SDB），收集10种核素（Am、Bi、Cm、Cs、Eu、Ni、Pb、Po、Ra、U）在膨润土中的1 240组Kd数据，选取9个输入因子，构建了包括随机森林（Random
杨 馨, 张 坤明, 陈 涛
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Biodiversity as a Dominant Force in Shaping Ethnic Music Styles 生物多样性:塑造民族音乐风格的主导力量
Integrative Conservation, EarlyView.Our findings show that plant, bird, and mammal diversity considerably shape musical features such as vocal range and ornamental sounds, more so than geography or lifestyle. Our study provides the first empirical evidence linking biodiversity to ethnic music styles. Protecting biodiversity, the musical and cultural will be protected.
Wenchen Song, Yifan Xue, Rui Li
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Journal of Adolescence, EarlyView.ABSTRACT Introduction Following rapid iterations in media technologies, Chinese millennials (born between 1980 and 1995) find themselves in a paradoxical state where digital saturation exists alongside fatigue, making them central practitioners of digital minimalist behavior.
Chao Zhang, Yinze Hao, Jingwen Li
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A Novel hemodynamic model of the cerebral arteriovenous malformation
, 2003 建立了一个新的非定常脑AVM血液动力学模型。模型克服了以往的定常AVM模型无法反映血流实际脉动，以及模型结构和血管性质描述上的缺陷，并依据临床实测数据提出了一种更为符合生理和病理实际的描述AVM供血动脉扩张现象的方法。模型模拟了AVM造成的脑血管压力、流量波形和脑血管输入阻抗的变化，并对脑AVM病人脑血管系统的输入阻抗进行了分析。为研究具有复杂结构的脑AVM血液动力学的特征 ...
严宗毅, 凌锋, 孙树津, 王大明
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Zhongguo youzhi, 2023 旨在为生物柴油后处理阶段的超临界CO2提纯工艺提供参考数据，以生物柴油生产过程中后处理阶段体系所含的油酸、无水乙醇及甘油为原料，通过在SYLG-01型超临界流体相平衡实验装置中，观察油酸-甘油-无水乙醇共混体系在温度为308 K下与CO2达到相平衡状态的过程。结果表明，油酸-甘油-无水乙醇共混体系为液-液两相，与CO2在相平衡实验装置内最开始是气-液-液态，随着压力的增加，当CO2达到超临界状态时，不同相之间的流动性和传递性增强，共混体系变成了均一态。因此，改变超临界CO2的压力 ...
笪雄志，郝小红，张旗，杜肃，张森 DA Xiongzhi，HAO Xiaohong，ZHANG Qi，DU Su，ZHANG Sen
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
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, 2001 脑动静脉畸形（Arteriovenous Malformation,AVM）是一种先天性的动静脉间短路血管组织,其所导致的异常脑血液动力学状态是造成脑AVM血管破裂出血和产生某些神经功能障碍的重要原因之一。本文结合脑血管内血液动力学参数的临床测量数据,通过建立脑AVM血液动力学模型的方法,对脑AVM出血的血液动力学因素进行了系统的分析 ...
严宗毅, 凌锋, 孙树津, 王大明
core
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Grasslands worldwide are experiencing severe degradation due to overgrazing, climate change and anthropogenic disturbances, resulting in substantial declines in biodiversity and ecosystem functioning.
Xiaoqi Wang +5 more
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