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Polymeric hollow fiber membrane for cooling crystallization seeding:On the mechanism of induced nucleation based on thermal transfer Author links open overlay panel

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Particuology 2024年第8期91卷 38-49页

作者： Zeman He Shaofu Du Guanying Shao Peiyu Li lei sheng Gaohong He Xiaobin Jiang Wu Xiao State Key Laboratory of Fine Chemicals School of Chemical EngineeringEngineering Laboratory for Petrochemical Energy-efficient Separation Technology of Liaoning ProvinceDalian University of TechnologyDalian 116024China

Cooling crystallization is an important separation process and particuology technology that requires accurate nucleation control ***,we introduced the polymeric hollow fiber membrane with proper thermal properties as the effective nucleation induction interface during cooling *** heterogeneous nucleation control mechanism was introduced based on classical nucleation theory and the thermal transfer *** properties and the thermal conductivity of two kinds of polymeric membranes,polytetrafluoroethylene(PTFE)and polyethersulfone(PES),were measured and simulated with the developed *** two membranes possessed different nucleation induction periods,nucleation rates and crystallization performances,which validated that the hollow fiber membrane module could effectively accelerate the nucleation process compared to conventional cooling crystallization owing to the shorter nucleation induction period and the reduced solution surface *** to the higher hydrophobicity and the lower roughness of the membrane surface,the PTFE membrane possessed a more moderate performance in generating stable heterogeneous nucleation than the one of PES ***,the adjustable membrane property enabled the hollow fiber membrane-assisted cooling crystallization to possess the accurate nucleation control and desired terminal particle products.

关键词： Cooling crystallization Nucleation Particle process Hollow fiber membrane Induction period Process control

Dynamic Analysis of A Deepwater Drilling Riser with A New Hang-off System

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China Ocean Engineering 2024年第1期38卷 29-41页

作者： LI Yan-wei LIU Xiu-quan WANG Jin-long CHEN Guo-ming CHANG Yuan-jiang sheng lei-xiang Centre for Offshore Engineering and Safety Technology China University of PetroleumQingdao 266580China National Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of PetroleumQingdao 266580China China CNOOC Research Institute Co. Ltd.Beijing 100028China

The safety of risers in hang-off states is a vital challenge in offshore oil and gas engineering.A new hang-off system installed on top of risers is proposed for improving the security of *** approach leads to a challenging problem:coupling the dynamics of risers with a new hang-off system combined with multiple structures and complex *** accurately analyze the dynamic responses of the coupled system,a coupled dynamic model is established based on the Euler-Bernoulli beam-column theory and penalty function method.A comprehensive analysis method is proposed for coupled dynamic analysis by combining the finite element method and the Newmarkβ*** analysis program is also developed in MATLAB for dynamic *** simulation results show that the dynamic performances of the risers at the top part are significantly improved by the new hang-off system,especially the novel design,which includes the centralizer and articulation *** bending moment and lateral deformation of the risers at the top part decrease,while the hang-off joint experiences a great bending moment at the bottom of the lateral restraint area which requires particular attention in design and *** platform navigation speed range under the safety limits of risers expands with the new hang-off system in use.

关键词： deepwater drilling riser new hang-off system dynamic analysis finite element method penalty function method

Loosely coordinating diluted highly concentrated electrolyte toward -60℃ Li metal batteries

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Journal of Energy Chemistry 2024年第3期90卷 380-387,I0009页

作者： Han Zhang Ziqi Zeng Qiang Wu Xinlan Wang Mingsheng Qin sheng lei Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Lithium metal batteries(LMBs) promise energy density over 400 Wh kg^(-1).However,they suffer severe electrochemical performance deterioration at sub-zero *** failure behavior highly correlates to inferior lithium metal anode(LMA) compatibility and sluggish Li^(+) ***,we demonstrate that cyclopentylmethyl ether(CPME) based diluted high-concentration electrolyte(DHCE)enables-60℃ LMBs *** leveraging the loose coordination between Li^(+) and CPME,such developed electrolyte boosts the formation of ion clusters to derive anion-dominant interfacial chemistry for enhancing LMA compatibility and greatly accelerates Li^(+) desolvation *** resulting electrolyte demonstrates high Coulombic efficiencies(CE),providing over 99.5%,99.1%,98.5% and 95% at 25,-20,-40,and-60℃*** assembled Li-S battery exhibits remarkable cyclic stability in-20,and-40℃ at 0.2 C charging and 0.5 C *** at-60℃,Li-S cell with this designed electrolyte retains> 70% of the initial capacity over 170 ***,lithium metal coin cell and pouch cell with10 mg cm^(-2) high S cathode loading exhibit cycling stability at-20℃.This work offers an opportunity for rational designing electrolytes toward low temperature LMBs.

关键词： Lithium metal batteries -60℃operation Lithium metal anode compatibility Li^(+) desolvation kinetics

“In-N-out” design enabling high-content triethyl phosphate-based non-flammable and high-conductivity electrolytes for lithium-ion batteries

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Science China Chemistry 2024年第2期67卷 724-731页

作者： Mengchuang Liu Fenfen Ma Zicheng Ge Ziqi Zeng Qiang Wu Hui Yan Yuanke Wu sheng lei Yanli Zhu Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan430074China GuSu Laboratory of Materials Suzhou215123China Institute of Metal Research Chinese Academy of SciencesShenyang110000China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

Safety issues related to flammable electrolytes in lithium-ion batteries(LIBs) remain a major challenge for their extended *** use of non-flammable phosphate-based electrolytes has proved the validity in inhibiting the combustion of ***,the strong interaction between Li^(+) and phosphate leads to a dominant solid electrolyte interphase(SEI) with limited electronic shielding,resulting in the poor Li^(+) intercalation at the graphite(Gr) anode when using high-phosphate-content *** mitigate this issue and improve Li^(+) insertion,we propose an “In-N-Out” strategy to render phosphates “noncoordinative”.By employing a combination of strongly polar solvents for a “block effect” and weakly polar solvents for a “drag effect”,we reduce the Li^(+)–phosphate *** a result,phosphates remain in the electrolyte phase(“In”),minimizing their impact on the incompatibility with the Gr electrode(“Out”).We have developed a non-flammable electrolyte with high triethyl phosphate(TEP) content(>60 wt.%),demonstrating the excellent ion conductivity(5.94 mS cm^(-1) at 30 ℃) and reversible Li^(+) intercalation at a standard concentration(~1 mol L^(-1)).This approach enables the manipulation of multiple electrolyte functions and holds the promise for the development of safe electrochemical energy storage systems using non-flammable electrolytes.

关键词： lithium-ion batteries graphite anode high-phosphate-content electrolytes non-flammable electrolyte excellent ion conductivity standard concentration

pH-controlled reversible sol-gel inversion by cerous phosphate nanofibers for hemostasis

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Rare Metals 2024年第10期43卷 5141-5151页

作者： Tuo Su Jun-Chen Xu Wei Yu Dan Su Di-Er Shi Yi-Chao Pang Yao Ying Wang-Chang Li Juan Li Jing-Wu Zheng Liang Qiao sheng-lei Che Jing Yu Research Center of Magnetic and Electronic Materials College of Materials Science and EngineeringZhejiang University of Technology State Key Laboratory for Diagnosis and Treatment of Infectious Diseases Collaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalCollege of MedicineZhejiang University Key Laboratory of Drug Safety Evaluation and Research of Zhejiang Province Department of Clinical MedicineHangzhou Medical College Department of Chemistry Zhejiang University Clinical Medical College Yangzhou University

Developing biomimetic soft materials that display stimuli responsiveness using solely inorganic materials has been regarded as a challenge owing to that such materials?properties typically vary from those of living ***,biomimetic soft materials have been developed using organic materials or inorganic materials modified with organic small *** this study,we prepared cerium phosphate nanofibers （CePO4NFs） by using inorganic agents only without further *** CePO4NFs demonstrate sol-ge switching properties in response to pH value,allowing them to form a gel under high hydroxide ion （OH-） concentrations and turn back into sol under low *** formation of gel could be ascribed to the physical cross-linking of the nanofibers induced by the attractive electrostatic force of OH-and surface Ce3+.As a result,CePO4NFs are able to form a gel when in contac with blood of high pH value for *** specific clotting mechanism makes them better candidates for hemostasis of heavy bleeding.

关键词： Cerium phosphate nanofibers Hemostasis pH-responsive Reversible Sol-gel switching

新能源汽车浸没式锂离子电池冷却技术研究进展

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制冷学报 2024年第3期45卷 38-49页

作者：李哲张华盛雷上海理工大学能源与动力工程学院上海200093 上海理工大学机械工程学院上海200093

浸没式电池冷却是将电池直接浸泡于冷却液中,相比常规间接式液冷、风冷和相变冷却,具有结构简单、降温迅速、均温性能好等优势。对目前浸没式电池冷却的相关技术进行了统计、归纳和总结,包括浸没液采选、冷却系统结构设计、热安全等,并... 详细信息

浸没式电池冷却是将电池直接浸泡于冷却液中,相比常规间接式液冷、风冷和相变冷却,具有结构简单、降温迅速、均温性能好等优势。对目前浸没式电池冷却的相关技术进行了统计、归纳和总结,包括浸没液采选、冷却系统结构设计、热安全等,并结合上述工作对浸没式电池冷却系统的技术应用进行分析。结果表明:浸没式冷却可快速降低电池温度,能够有效提升电池组的温度均一性;但该技术对电池模组的密封性要求较高,漏液以及腐蚀等难题有待解决。

关键词：新能源汽车浸没式电池冷却电池热管理浸没液

基于网络游记的城市夜间旅游游客体验研究——以上海市为例

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上海建桥学院学报 2024年第2期 34-40页

作者：盛蕾上海建桥学院商学院

作为一种日益增长的全球现象,夜间旅游是夜间经济的重要经济和文化贡献者[1],有利于城市旅游的增长、形象的提升和居民休闲生活条件的改善[2]。拥有丰富夜间旅游设施和服务的城市被认为是充满活力的[3],北京、上海、成都等城市在发展夜... 详细信息

作为一种日益增长的全球现象,夜间旅游是夜间经济的重要经济和文化贡献者[1],有利于城市旅游的增长、形象的提升和居民休闲生活条件的改善[2]。拥有丰富夜间旅游设施和服务的城市被认为是充满活力的[3],北京、上海、成都等城市在发展夜间旅游方面处于优先地位,采用延长公共交通和景区运营时间、设立夜生活首席执行官等措施支持着夜间旅游的发展[4]。大量的实践使夜间旅游受到学术界广泛的关注,相关研究逐渐增多。

关键词：夜间旅游游客体验网络游记首席执行官公共交通优先地位夜生活贡献者

基于潜在状态分布GPT的离线多智能体强化学习方法

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计算机科学与探索 2024年第8期18卷 2169-2179页

作者：盛蕾陈希亮赖俊中国人民解放军陆军工程大学指挥控制工程学院南京210007

通过决策Transformer对基础模型进行离线预训练可以有效地解决在线多智能体强化学习采样效率低和可扩展性的问题,但这种生成预训练方法在个体奖励难以定义和数据集不能覆盖最优策略的多智能体任务中表现不佳。针对此问题,采用潜在状态... 详细信息

通过决策Transformer对基础模型进行离线预训练可以有效地解决在线多智能体强化学习采样效率低和可扩展性的问题,但这种生成预训练方法在个体奖励难以定义和数据集不能覆盖最优策略的多智能体任务中表现不佳。针对此问题,采用潜在状态分布改进决策Transformer,提出了一种融合离线预训练和在线微调的多智能体强化学习算法。该算法利用自编码器和独热编码方法生成离散的潜在状态表示,保留了原始状态空间中某些重要的信息;通过潜在的临时抽象改进生成式预训练的决策Transformer,类似于数据增益的技术,在一定程度上解决了未充分覆盖状态空间的离线数据集导致的外推误差问题;采用集中训练和分散执行的方式解决在线微调时智能体的信度分配问题;通过鼓励探索的多智能体策略梯度算法在下游任务中进一步探索协同策略。在星际争霸仿真平台上进行实验,与基线算法相比,在较少甚至没有离线轨迹数据的任务中得分更高,泛化能力更强。

关键词：离线多智能体强化学习分布式学习表示学习大语言模型

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窄煤柱沿空巷道切顶卸压护巷技术应用

自动化应用 2024年第18期65卷 131-133页

作者：盛磊淮北矿业股份有限责任公司芦岭煤矿安徽淮北235000

为了降低Ⅱ888工作面回采期间沿空巷道矿压显现剧烈程度,提出在Ⅱ888风巷内进行预裂爆破切顶卸压试验。通过理论分析,合理确定了爆破钻孔的参数,并在现场进行了工业试验。试验效果显示,巷道的围岩变形明显改善,巷道修复量降低,高效生产... 详细信息

为了降低Ⅱ888工作面回采期间沿空巷道矿压显现剧烈程度,提出在Ⅱ888风巷内进行预裂爆破切顶卸压试验。通过理论分析,合理确定了爆破钻孔的参数,并在现场进行了工业试验。试验效果显示,巷道的围岩变形明显改善,巷道修复量降低,高效生产技术水平提升。

关键词：窄煤柱沿空巷道矿压显现切顶卸压爆破钻孔