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超声和射流作用下泡沫金属流动液膜传热分析

上海计量测试 2022年第3期49卷 2-6页

作者：刘燚陈威庄炜杰邬昕胡馨丹邹冰妍上海市计量测试技术研究院上海海事大学

在超声波和射流冲击作用下的流动液膜覆盖泡沫金属以降低受热面的温度,达到冷却的目的。通过实验,对超声波作用下的不同液膜厚度和液膜流速以及空气射流速度对流动液膜传热性能的影响进行了研究。实验结果表明,在超声波作用下,空气射流... 详细信息

在超声波和射流冲击作用下的流动液膜覆盖泡沫金属以降低受热面的温度,达到冷却的目的。通过实验,对超声波作用下的不同液膜厚度和液膜流速以及空气射流速度对流动液膜传热性能的影响进行了研究。实验结果表明,在超声波作用下,空气射流速度以及液膜流速越大,液膜厚度越薄,壁面的散热效果越好。此外,与无超声波的情况相比,获得了超声波作用下传热系数的上升速率。基于实验结果,得到了超声波与泡沫金属以及射流冲击作用的耦合可强化传热、降低壁温的结论。该研究对今后工作具有指导意义。

关键词：超声波射流冲击泡沫金属液膜传热

基于分子动力学的钠离子与纳米二氧化硅表面的相互作用过程模拟

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油田化学 2024年第3期41卷 491-497页

作者：张凤娟张磊吕振虎麦尔耶姆古丽·安外尔余维初王牧群董景锋庄为杰中国石油新疆油田分公司工程技术研究院新疆克拉玛依834000 中国地质大学油气勘探开发理论与技术湖北省重点实验室湖北武汉430074 长江大学化学与环境工程学院湖北荆州434023

认识盐水中的Na^(+)对纳米SiO_(2)的作用过程,可为优化纳米SiO_(2)在石油开采领域的应用参数提供依据。以无定形纳米SiO_(2)粒子为研究对象,构建了一种既有饱和稳定的硅醇基团,又有脱质子化的硅醇基团的纳米SiO_(2)粒子模型。通过分子... 详细信息

认识盐水中的Na^(+)对纳米SiO_(2)的作用过程,可为优化纳米SiO_(2)在石油开采领域的应用参数提供依据。以无定形纳米SiO_(2)粒子为研究对象,构建了一种既有饱和稳定的硅醇基团,又有脱质子化的硅醇基团的纳米SiO_(2)粒子模型。通过分子模拟方法,刻画了Na^(+)在纳米SiO_(2)表面的运移特征、扩散行为、对氢键的影响以及体系中的相互作用能。结果表明,在纳米SiO_(2)-NaCl溶液体系中,当Na^(+)运移至距纳米SiO_(2)粒子表面6.540A时,短程力开始起作用;当Na^(+)运移至距纳米SiO_(2)粒子表面2~3A时,二者发生电荷交换,Na^(+)产生振荡运动。在NaCl质量浓度为3 g/L时,Na^(+)与水分子主要进行水合作用,形成稳定的溶剂化层,Na^(+)与纳米SiO_(2)粒子之间的作用力弱,Na^(+)更易在溶液中扩散。随着NaCl质量浓度增至7 g/L,Na^(+)突破溶剂化层,和水分子一起被吸附到纳米SiO_(2)粒子的表面,发生电荷置换,Na^(+)的运移能力减弱,扩散系数由1.39×10^(-4)A^(2)/ps下降至3.75×10^(-5)A^(2)/ps,斯特恩层的厚度由0.88A下降至0.72A,亥姆霍兹层的厚度由0.64A下降至0.20A,纳米SiO_(2)与Na^(+)之间的相互作用能由-14 000 kcal/mol变为-22 000 kcal/mol,纳米SiO_(2)的稳定性逐渐被破坏。Na^(+)与纳米SiO_(2)粒子的静电相互作用是影响纳米SiO_(2)粒子表面性质的主要作用力,氢键和范德华力则是次要作用力。研究结果可为纳米SiO_(2)材料在油气开采领域及其他相关行业的应用提供基础理论认识。

关键词：分子模拟纳米SiO_(2) 钠离子水合离子表面作用

Fault Tolerance for Corporate Innovation:Evidence from the Reform of State-owned Enterprises

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Frontiers of Business Research in China 2023年第1期17卷 126-159页

作者： zhuang Qinqin LIN Ruixing LUO weijie Institute of Quantitative&Technical Economics Chinese Academy of Social SciencesBeijing 100732China Said Business School University of OxfordOxfordEnglandOX11HPUK Center for China Fiscal Development Central University of Finance and EconomicsBeijing 102206China

Innovation is the source of power for high-quality development,and a relaxed institutional arrangement is a necessity for promoting innovation in *** paper examines the impact of fault tolerance on corporate innovation,theoretically analyzes the positive effects of fault tolerance on stimulating innovation,and estimates the influence of fault tolerance on corporate innovation by using the panel data of listed manufacturing companies from 2007 to 2019,taking the quasi-natural experiment of fault-tolerance system in various places since the new round of stateowned enterprise(SOE)*** study finds that the fault-tolerance system has significantly improved the R&D investment and patent application of the pilot SOEs,but the incentive effect is mainly reflected in the utility model patents;fault-tolerance system mainly promotes corporate innovation by alleviating managers’career worries and improving governance ***,the fault-tolerance system is more effective for small and medium-sized SOEs with low market competition and can alleviate the restriction of agency cost on corporate *** addition,the fault-tolerance system has not yet had a significant spillover effect on private *** results show that in the SOE reform,it is necessary to strengthen the institutional arrangement of fault tolerance and create a relaxed environment to encourage innovation;it is necessary to organically integrate fault-tolerancesystem design into executive measurement and corporate governance,promote faulttolerant system to be implemented in a wider range of enterprises,and enhance the incentive effect on high-quality innovation.

关键词： fault tolerance corporate innovation incentive mechanism stateowned enterprise reform quasi-natural experiment

基于不同气体和压力下通道型正压标准漏孔漏率的分析

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上海计量测试 2022年第1期49卷 31-33页

作者：刘燚刘贝贝周宇仁庄炜杰邬昕胡馨丹上海市计量测试技术研究院

依据JJF 1627-2017《皂膜流量计标准漏孔校准规范》以及正压标准漏孔校准装置,分别分析了在高纯空气、高纯氮气、高纯氦气和不同压力条件下对漏孔漏率的影响。研究结果表明,同种气体在较小的压力下,漏孔中的漏率与压力成比例关系。此外... 详细信息

依据JJF 1627-2017《皂膜流量计标准漏孔校准规范》以及正压标准漏孔校准装置,分别分析了在高纯空气、高纯氮气、高纯氦气和不同压力条件下对漏孔漏率的影响。研究结果表明,同种气体在较小的压力下,漏孔中的漏率与压力成比例关系。此外,同种气体通过漏孔的漏率会随进口压力的增大而增大,在进口端压力相同且压力较大的条件下,高纯氦气的漏率值最大,这说明气体分子的黏滞性是影响漏率大小的主要因素。

关键词：不同气体黏滞性通道型标准漏孔漏率

3D bioprinted breast tumor model for structure–activity relationship study

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Bio-Design and Manufacturing 2020年第4期3卷 361-372页

作者： Xiaorui Li Quanfeng Deng Tiantian zhuang Yao Lu Tingjiao Liu weijie Zhao Bingcheng Lin Yong Luo Xiuli Zhang State Key Laboratory of Fine Chemicals Department of Pharmaceutical SciencesSchool of Chemical EngineeringDalian University of TechnologyDalianChina College of Pharmaceutical Sciences Soochow UniversitySoochowChina Dalian Institute of Chemical Physics Chinese Academy of SciencesDalianChina Section of Oral Pathology College of StomatologyDalian Medical UniversityDalianChina

In this paper,we present a 3D printed tumor spheroidal model suitable for drug *** model is based on a hydroxyethyl cellulose/alginate/gelatin(HCSG)composite biomaterial that has three distinct properties:(1)the HCSG is similar to the commercial basement membrane extract in Ki67,MUC1,and PARP1 expressions of MCF-7 cells for embedding culture;(2)the HCSG is printable at room temperature;and(3)the HCSG can be large-scale manufactured at an ultralow *** printed a 3D MCF-7 spheroid model with HCSG and characterized it in terms of cell viability,spheroid size,key protein expression,and mitochondrial metabolic *** used the 3D MCF-7 spheroid model to evaluate the anti-breast cancer activity of 13 amino acid-based flavone phosphoramidates and found that the alanine structure induced a stronger drug resistance,whereas phenylalanine hardly caused drug resistance in the MCF-7 *** is the first time that 3D bioprinting technology has been used in a structure–activity relationship study.

关键词： Biomaterial Structure-activity relationship Hydroxyethyl cellulos

High area-capacity Mg batteries enabled by sulfur/copper integrated cathode design

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Journal of Energy Chemistry 2022年第9期31卷 370-378,I0011页

作者： Zhenfang Zhou Aobing Du weijie Kong zhuang Chen Zhonghua Zhang Bingbing Chen Yitao He Shanmu Dong Zhenjiang Li Guicun Li Guanglei Cui College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101ShandongChina Department of Energy Science and Engineering Nanjing Tech UniversityNanjing 211816JiangsuChina Department of Physics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Rechargeable Mg batteries potentially display lower cost and competitive energy density compared with their Li-ion ***,the practical implementation of high area-capacity cathodes still remains a formidably challenging *** work presents the sulfur/copper integrated cathodes fabricated by the conventional blade-coating process and slurry-dipping *** sulfur/copper foil integrated cathodes deliver a high area-capacity of 2.6 mAh cm^(-2)after 40 cycles,while the sulfur/copperfoam integrated cathode exhibits an ultrahigh area-capacity of 35.4 mAh cm^(-2),corresponding to 743.1 Wh L^(-1)at the electrode level(1.5 times higher than the LiCoO_(2)-graphite system).The in-situ formed copper sulfide intermediates with sufficient cation defects can act as functional intermediates to regulate the sulfur electrochemistry during the first discharge *** subsequent cycles are operated by the reversible displacement reaction between Mg-ions and copper sulfide active *** particular,the copper ions prefer to extrude along the[001]direction in copper sulfides lattice and simultaneously the rock-salt MgS crystals are ***,the nonuniform surface topography of the cycled Mgmetal anode,caused by the spatial inhomogeneity in current distribution,is demonstrated to lead to the battery performance degradation for high area-capacity Mg batteries.

关键词： Magnesium batteries Sulfur cathode Displacement reaction Copper sulfides