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Fast internal preheating of 4680 lithium-ion batteries in cold environments

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Nano Research 2024年第10期17卷 8794-8802页

作者： Chuyue Guan Harrison szeto Olivia Wander Vijay Kumar Raphaele JClément Yangying Zhu Department of Mechanical Engineering University of California Santa BarbaraSanta BarbaraCA 93106USA Department of Chemistry and Biochemistry University of California Santa BarbaraSanta BarbaraCA 93106USA Department of Materials University of California Santa BarbaraSanta BarbaraCA 93106USA

Lithium-ion batteries are expected to operate within a narrow temperature window around room temperature for optimal performance and ***,in cold environments,electric vehicle battery packs must be extensively preheated prior to charge or ***,conventional preheating is accomplished externally,which is slow and thus significantly increases charging ***,internal heating has been demonstrated as a potential solution to quickly and uniformly preheat a lithium-ion pouch ***,internal heating has not been evaluated in other battery formats such as cylindrical *** this work,we present a numerical model of a 4680 battery with internal heaters for fast preheating in cold *** effects that the number of heater layers,heating duration,resting duration,environmental temperature,and boundary heat transfer coefficient have on the temperature heterogeneity of the battery were *** results show that internal heating alone reduces the temperature variation within the battery by a factor of 5 compared to external heating,and by a factor of 20 when combining internal and external *** study further proves that internal preheating of lithium-ion batteries is a promising thermal management strategy,and provides guidance on potential design considerations and heating protocols to implement internal heating.

关键词： lithium-ion battery 4680 battery thermal management internal battery preheating COMSOL Multiphysics thermal simulation battery temperature heterogeneity

Heat transfer during droHeat transfer during droplet impact on a cold superhydrophobic surface via interfacial thermal mappingplet impact on a cold superhydrophobic surface via interfacial thermal mapping

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Droplet 2024年第3期3卷 71-79页

作者： Vijay Kumar Qianxi Fu Harrison szeto Yangying Zhu Department of Mechanical Engineering University of California Santa BarbaraSanta BarbaraCaliforniaUSA Department of Chemistry and Biochemistry University of California Santa BarbaraSanta BarbaraCaliforniaUSA

Undesired heat transfer during droplet impact on cold surfaces can lead to ice formation and damage to renewable infrastructure,among *** address this,superhydrophobic surfaces aim to minimize the droplet surface interaction thereby,holding promise to greatly limit ***,the dropletimpact on such surfaces spans only a few milliseconds making it difficult to quantify the heat exchange at the droplet–solid ***,we employ high-speed infrared thermography and a three-dimensionaltransient heat conductionCOMSOL modelto map the dynamic heat flux distribution during droplet impact on a cold superhydrophobic *** comprehensive droplet impact experiments for varying surface temperature,droplet size,and impacting height reveal that the heat transfer effectiveness(Q′)scales with the dimensionless maximum spreading radius as Q′∼(Rmax∕Ri)1.6,deviating from previous semi-infinite ***,despite shorter contact times,droplets impacting from higher heights demonstrate increased heat transfer effectiveness due to expanded contact *** results suggest that reducing droplet spreading time,as opposed to contact time alone,can be a more effective strategy for minimizing heat *** results presented here highlight the importance of both contact area and contact time on the heat exchange between a droplet and a cold superhydrophobic surface.

关键词： surface. hydrophobic transfer

Choledochal varices bleeding:A case report

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World Journal of Gastrointestinal Endoscopy 2010年第5期2卷 190-192页

作者： Chi Ho Ng Lawrence Lai Ka Ho Lok Kin Kong Li ming leung szeto Department of Medicine and Geriatrics Tuen Mun HospitalHong KongChina

Choledochal varices are a rare cause of hemobilia associated with chronic portal vein *** present a case of chronic portal vein thrombosis comp licated with bleeding from choledochal *** presentation,clinical manifest... 详细信息

关键词： Bile duct varices Portal hypertens ive biliopathy Common bile duct dilatation Extrahepatic portal vein obstruction Endoscopic ultrasound Hemobilia Portal vein thrombosis

Theory of Critical Phenomena with Memory

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Chinese Physics Letters 2022年第12期39卷 1-7页

作者： Shaolong Zeng Sue Ping szeto Fan Zhong State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-Sen UniversityGuangzhou 510275China

Memory is a ubiquitous characteristic of complex systems,and critical phenomena are one of the most intriguing phenomena in ***,we propose an Ising model with memory,develop a corresponding theory of critical phenomena with memory for complex systems,and discover a series of surprising novel *** show that a naive theory of a usual Hamiltonian with a direct inclusion of a power-law decaying long-range temporal interaction violates radically a hyperscaling law for all spatial dimensions even at and below the upper critical *** entails both indispensable consideration of the Hamiltonian for dynamics,rather than the usual practice of just focusing on the corresponding dynamic Lagrangian alone,and transformations that result in a correct theory in which space and time are inextricably interwoven,leading to an effective spatial dimension that repairs the hyperscaling *** theory gives rise to a set of novel mean-field critical exponents,which are different from the usual Landau ones,as well as new universality *** exponents are verified by numerical simulations of the Ising model with memory in two and three spatial dimensions.

关键词： critical Hamiltonian scaling

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彭锐基于五脏相关理论辨治高血压病经验介绍

新中医 2024年第15期56卷 228-232页

作者：司徒嘉雯彭锐广州中医药大学第一临床医学院广东广州510405 广州中医药大学第一附属医院广东广州510405 广州中医药大学顺德医院广东佛山528300

高血压病是常见的临床慢性疾病,容易发生心、脑、肾等多器官损伤,影响患者健康。彭锐教授以国医大师邓铁涛教授“五脏相关”理论为指导,结合多年临床经验将高血压诊疗思路概括为其本在肾,其治在肝,其害在心,其复在脾,其进在肺。总结彭... 详细信息

高血压病是常见的临床慢性疾病,容易发生心、脑、肾等多器官损伤,影响患者健康。彭锐教授以国医大师邓铁涛教授“五脏相关”理论为指导,结合多年临床经验将高血压诊疗思路概括为其本在肾,其治在肝,其害在心,其复在脾,其进在肺。总结彭教授基于五脏相关理论辨治高血压病的经验,为中医药治疗高血压病提供更多治疗思路。

关键词：高血压病五脏相关邓铁涛彭锐

Influence of Strong Electron-Electron Interaction on the Peierls Transition

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Chinese Physics Letters 1997年第1期14卷 63-66页

作者： HU Lian K.Y.szeto SUN Xin Department of Physics South China Normal UniversityGuangzhou 510631 Department of Physics The Hong Kong University of Science and TechnologyHong Kong Department of Physics Fudan UniversityShanghai 200433

The influence of short-ranged Coulomb repulsion of strongly correlated electrons on the Peierls transition for a quasi-one-dimensional system is *** shows that the influence varies with the band filling and proves that the condition of single-occupation leads to a singularity on the density of states at half-filling which enhances *** also shows that dimerization is suppressed by the increase of U in the region of large-U and proves that increasing nearest-neighbor interaction V will suppress the Peierls transition temperature at half-filling,and strongly enhance it for band-filling at n≈1/4,which means the enhancement of tetramer-ization for a quarter-filled band.

关键词： Electron Peierls singularity

Structural Changes of a Tropical Cyclone during Landfall: β-plane Simulations

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Advances in Atmospheric Sciences 2010年第5期27卷 1143-1150页

作者： K.C.szeto Johnny C.L.CHAN School of Energy and Environment City University of Hong Kong

This study investigated the effects of landfall on the structure of a tropical cyclone （TC）. Numerical simulations were performed using the Weather Research and Forecasting Model on a β-plane. Two landfall experiments, one with an east–west and another with a north–south oriented coastline, were performed. Similar to previous studies on an f-plane, large-scale flows in the low-to-middle troposphere were modified due to friction. A pair of counter rotating gyres was found, which was shown to be consistent with the slight deffection of the TC relative to the control experiment without land. Compared to previous f-plane simulations, because of the inherent asymmetries due to the β-gyres, the large-scale pattern of flows and convergences/divergences related to friction were found to depend on coastline orientations. On the other hand, regardless of the coastline orientation, convergences were found to be stronger to the left for both cases near landfall, as in previous f-plane simulations. Such a convergence pattern subsequently induced a change in convection and rainfall at the eyewall.

关键词： tropical cyclone landfall numerical simulations

中国西部5城市中老年人血清25羟基维生素D与握力的相关性

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北京大学学报（医学版） 2024年第3期56卷 448-455页

作者：靖婷江华李婷申倩倩叶兰曾银丹梁文欣冯罡司徒文佑张玉梅北京大学公共卫生学院营养与食品卫生学系北京100191 北京大学护理学院北京100191 国家乳业技术创新中心呼和浩特010110

目的:探究中国西部5城市中老年人血清25羟基维生素D[25-hydroxyvitamin D,25(OH)D]与握力的相关性。方法:基于2023年2—7月在中国西部5个城市开展的横断面调查数据,通过问卷收集中老年人的相关人口学特征,通过体格检查记录握力,采集空... 详细信息

目的:探究中国西部5城市中老年人血清25羟基维生素D[25-hydroxyvitamin D,25(OH)D]与握力的相关性。方法:基于2023年2—7月在中国西部5个城市开展的横断面调查数据,通过问卷收集中老年人的相关人口学特征,通过体格检查记录握力,采集空腹血液样本分离血清并使用高效液相色谱串联质谱法测定血清25(OH)D浓度,使用卡方检验进行组间比较,使用Logistic回归分析西部5城市中老年人血清25(OH)D与握力的相关性。结果:我国西部5城市中老年人维生素D的缺乏率和不足率分别为52.9%和34.5%[维生素D缺乏定义为血清25(OH)D总浓度<20μg/L,维生素D不足定义为血清25(OH)D总浓度为20~30μg/L],高龄、女性、采样季节在冬季的中老年人血清25(OH)D水平更低(P<0.05)。25.3%的中老年人发生了握力减退,65~80岁25(OH)D缺乏的老年人握力减退的发生率高于25(OH)D不足的老年人(45.0%vs.32.6%)和25(OH)D充足的老年人(45.0%vs.20.6%);25(OH)D缺乏的75~80岁老年人握力减退的发生率最高(62.1%),25(OH)D不足组次之(11.1%,P<0.05)。与25(OH)D充足的中老年人相比,25(OH)D缺乏的中老年人发生握力减退的风险增加1.4倍(OR=2.403,95%CI:1.202~4.804,P=0.013),未发现25(OH)D不足与中老年人握力状况存在显著相关关系;血清总25(OH)D每增加5μg/L,其发生握力减退的风险降低13.1%(OR=0.869,95%CI:0.768~0.982,P=0.025);血清25(OH)D 2每增加5μg/L,其发生握力减退的风险降低24.1%(OR=0.759,95%CI:0.582~0.990,P=0.042);未发现血清25(OH)D 3含量与握力减退风险存在显著相关关系。血清25(OH)D水平每增加一个等级(缺乏、不足和充足),中老年人发生握力减退的风险降低25.2%(OR=0.748,95%CI:0.598~0.936,P=0.011)。在65~80岁和65~69岁的两组调查对象中,血清25(OH)D水平每增加一个等级,发生握力减退的风险降低40.0%,而在75~80岁的调查对象中,25(OH)D水平每增加一个等级,发生握力减退的风险降低80.0%。结论:中国西部5城市中老年人血清总25(OH)D和25(OH)D 2含量与握力状况存在一定关联。

关键词：中国西部老年人 25羟基维生素D 握力

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Laser acupuncture combined with auricular acupressure improves low-back pain and quality of life in nurses:A randomized controlled trial

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Journal of Integrative Medicine 2023年第1期21卷 26-33页

作者： Hsueh-Hua Yang Yu-Chu Chung Pai-Pei szeto Mei-Ling Yeh Jaung-Geng Lin School of Nursing National Taipei University of Nursing and Health SciencesTaipei 11219TaiwanChina Nursing Department En Chu Kong HospitalNew Taipei 23702TaiwanChina Department of Nursing Yuanpei University of Medical TechnologyHsinchu 30015TaiwanChina Cochrane Taiwan Taipei Medical UniversityTaipei 11031TaiwanChina School of Chinese Medicine China Medical UniversityTaichung 40402TaiwanChina

Background Low-back pain(LBP)in nurses is a major health concern that affects their quality of life and ability to work,with consequences for their economic *** This study evaluates the effect of low-level laser acupuncture combined with auricular acupressure(LAA)on pain intensity,pain interference and quality of life in nurses with ***,setting,participants and interventions This randomized controlled trial recruited a convenience sample of hospital-based nurses from one teaching hospital in Taiwan,*** were randomly assigned to the LAA group(n=38)receiving low-level laser acupuncture and auricular acupressure for 4 weeks,and the control group(n=38)receiving only sham laser acupuncture treatment without laser energy *** outcome measures Data were collected for the primary pain outcome using the Short Form of the Brief Pain Inventory,while the secondary outcome,quality of life,was evaluated using the Roland-Morris Disability *** primary and secondary outcomes were scored before the intervention,and after 2-week and 4-week *** rate of LBP recurrence was evaluated at the 4th week and 8th week after the end of *** After controlling for prior pain,the result of linear mixed model analysis showed trends in significant between-group differences in the level of current pain occurring in week 4(P<0.001),worst pain in week 2(P<0.001)and week 4(P<0.001),least pain in week 2(P=0.032)and week 4(P<0.001),pain interference in week 2(P=0.009)and week 4(P<0.001),and in the life dysfunction in week 2(P<0.001)and week 4(P<0.001).Recurrence rates of LBP at the 4th and 8th weeks after the end of intervention were 0%and 36.89%in the LAA group,and 69.44%and 36.11%in the control *** This study shows that 4-week LAA intervention reduced pain intensity and pain interference,and improved quality of life for hospital-based nurses with *** effects were maintained continuously for at least 4

关键词： Acupuncture Acupressure Low-backpain Low-level laser Qualityof life Randomized controlled trial