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ULTRASONIC INFLUENCE OF POROSITY LEVEL ON CFRP COMPOSITE LAMINATES USING RAYLEIGH PROBE WAVES

Acta Mechanica Solida Sinica 2008年第4期21卷 298-307页

作者： Je-Woong Park Do-Jung Kim Kwang-Hee Im Sang-Kyu Park david K.Hsu Adam H.Kite Sun-Kyu Kim Kil-Sung lee In-Young Yang Dept.of Naval Architecture and Ocean Eng. Chosun UniversityKwangju 501-759Korea Dept.of Automotive Eng. Woosuk UniversitySamrae-upWanju-kunChonbuk565-701Korea Center for Nondestructive Evaluation Iowa State UniversityAmesIowa 50011USA Division of Precision Mec.Eng. Chonbuk National UniversityJeonju 561-756Korea School of Mechanical Engineering Chosun UniversityKwangju 501-759Korea

It was found that a pitch-catch signal was more sensitive than normal incidence backwall echo of longitudinal wave to subtle flaw conditions in the composites （damages, fiber orientation, low level porosity, ply waviness, and cracks）. Both the strength and stiffness depend on the fiber orientation and porosity volume in the composites. The porosity content of a composite structure is critical to the strength and performance of the structure in general. The depth of the sampling volume where the pitch-catch signal came from was relatively shallow with the head- to-head miniature Rayleigh probes, but the depth can be increased by increasing the separation distance of the transmitting and receiving probes. Also, a method was utilized to determine the porosity content of a composite lay-up by processing micrograph images of the laminate. A free software package was utilized to process micrograph images of the test sample. The results from the image processing method were compared with existing data. Beam profile was characterized in unidirectional CFRP（carbon fiber reinforced plastics） using pitch-catch Rayleigh probes and the one-sided pitch-catch technique was utilized to produce C-scan images with the aid of the automatic scanner.

关键词： ply-layup orientation unidirectional CFRP beam profile pitch-catch contact mode,porosity level

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Deciphering the Oxygen Absorption Pre-edge: A Caveat on its Application for Probing Oxygen Redox Reactions in Batteries

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Energy & Environmental Materials 2021年第2期4卷 246-254页

作者： Subhayan Roychoudhury Ruimin Qiao Zengqing Zhuo Qinghao Li Yingchun Lyu Jung-Hyun Kim Jun Liu Eungje lee Bryant J.Polzin Jinghua Guo Shishen Yan Yongsheng Hu Hong Li david Prendergast Wanli Yang Advanced Light Source Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeley CA 94720USA School of Advanced Materials Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China School of Physics National Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Mechanical and Aerospace Engineering The Ohio State UniversityColumbus OH 43210USA R&D department 2M LLC193 Thompson DrHockessin DE 19707USA Chemical Science and Engineering Division Argonne National LaboratoryArgonne IL 60439 USA The Molecular Foundry Lawrence Berkeley National Laboratory1 Cyclotron Road Berkeley CA 94720 USA

The pre-edges of oxygen-K X-ray absorption spectra have been ubiquitous in transition metal(TM)oxide studies in various fields,especially on the fervent topic of oxygen redox states in battery ***,critical debates remain on the use of the O-K pre-edge variations upon electrochemical cycling as evidences of oxygen redox reactions,which has been a popular practice in the battery *** study presents an investigation of the O-K pre-edge of 55 oxides covering all 3d TMs with different elements,structures,and electrochemical states through combined experimental and theoretical *** is shown unambiguously that the O-K pre-edge variation in battery cathodes is dominated by changing TM-d ***,the pre-edge enables a unique opportunity to project the lowest unoccupied TM-d states onto one common energy window,leading to a summary map of the relative energy positions of the low-lying TM states,with higher TM oxidation states at lower energies,corresponding to higher electrochemical *** results naturally clarify some unusual redox reactions,such as Cr^(3+/6+).This work provides a critical clarification on O-K pre-edge interpretation and more importantly a benchmark database of O-K pre-edge for characterizing redox reactions in batteries and other energy materials.

关键词： battery oxygen redox x-ray absorption spectroscopy cathode material redox reaction

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预见未来:米兰设计周2024

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现代装饰 2024年第3期 96-107页

作者： DesignSingapore Council(设计) Gabriel Tan(设计) Tiffany Loy(设计) Faezah Shaharuddin(设计) Zavier Wong(设计) Genevieve Ang and Interactive Materials Lab(设计) david lee(设计) Christian+Jade(设计) Lasvit(设计) Maria Culenova(设计) Yabu Pushelberg(设计) Claesson Koivisto Rune(设计) Jan Plechac and Henry Wielgus(设计) Masquespacio(设计) nendo(设计) Zaha Hadid Architects(设计) Neutra(设计) iSiMAR(设计) DECHEM studio(设计) ecoLogicStudio(设计) 范嘉苑(编译) 不详

Mosaic Membrane是一次关于材料的试验,设计师以皮肤般的形态来呈现马赛克瓷砖,并通过三维形式将之打造成家具。对于边角石料的再利用而言,制作成马赛克瓷砖是一种可持续的选择。为了尽可能地减少材料,设计师还采用了掏空手法。Tiffany ... 详细信息

Mosaic Membrane是一次关于材料的试验,设计师以皮肤般的形态来呈现马赛克瓷砖,并通过三维形式将之打造成家具。对于边角石料的再利用而言,制作成马赛克瓷砖是一种可持续的选择。为了尽可能地减少材料,设计师还采用了掏空手法。Tiffany Loy与Friul Mosaic的合作,也基于在纺织品和马赛克材料在流动性方面的相似研究。最后呈现出的作品化刚为柔,极具流动的美感。

关键词：米兰设计周马赛克 Mosaic 流动性瓷砖可持续的掏空纺织品

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Torque Sharing Function Control of Switched Reluctance Machines with Reduced Current Sensors

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CES Transactions on Electrical Machines and Systems 2018年第4期2卷 355-362页

作者： wei Peng Johan Gyselinck Jin-Woo Ahn Dong-Hee lee Bio ElectroUniversitéLibre de Bruxelles(ULB)BrusselsBelgium Mechanical Systems(BEAMS)Department UniversitéLibre de Bruxelles(ULB)BrusselsBelgium Department of Mechatronics Engineering Kyungsung UniversityBusanKorea

This paper presents a Torque Sharing Function(TSF)control of Switched Reluctance Machines(SRMs)with different current sensor placements to reconstruct the phase *** requires precise phase current information to ensure accurate torque *** proposed methods with different chopping transistors or a new PWM implementation require four or two current sensors to replace the current sensors on each phase regardless of the phase *** both approaches,the actual phase current can be easily extracted during the single phase conducting ***,how to separate the incoming and outgoing phase current values during the commutation region is the difficult issue to deal *** order to derive these two adjacent currents,the explanations and comparisons of two proposed methods are *** effectiveness is verified by experimental results on a four-phase 8/6 ***,the approach with a new PWM implementation is selected,which requires only two current sensors for reducing the number of *** control system can be more compact and cheaper.

关键词： Current sensor placement pulse width modulation(PWM) switched reluctance machines torque sharing function

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刺梨不同提取部位对人类肝癌细胞株(HepG2)胆固醇代谢的影响

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中国中药杂志 2007年第2期32卷 170-171页

作者：吴水生郭改革王宏 david lee 福建中医学院药学系 Bio-organic and Natural Product Lab Mclean Hospital Harvard Medical School MA USA02478 Bio-organic

刺梨Rosa roxburghii Tratt．为蔷薇科属野生植物，用于治疗积食腹胀、肠炎痢疾、维生素C缺乏症等。刺梨含维生素C、维生素E、超氧化物歧化酶（SOD）、多糖，以及伊谷缁醇、原儿茶酸、委陵菜酸、euscaphic acid、硬脂酸和廿一烷酸等成... 详细信息

刺梨Rosa roxburghii Tratt．为蔷薇科属野生植物，用于治疗积食腹胀、肠炎痢疾、维生素C缺乏症等。刺梨含维生素C、维生素E、超氧化物歧化酶（SOD）、多糖，以及伊谷缁醇、原儿茶酸、委陵菜酸、euscaphic acid、硬脂酸和廿一烷酸等成分。具有清除自由基、增强机体免疫力、防动脉粥样硬化、抗细胞突变和抗癌等药理作用，此外还有明显的降血脂作用。本实验以人类肝癌细胞系HepG2为模型，测定刺梨各部位对细胞胆固醇合成与代谢的影响，以筛选刺梨降血脂作用有效成分或有效部位，为进一步开发刺梨降血脂药用部位奠定基础。

关键词：胆固醇代谢肝癌细胞株刺梨提取部位人类维生素C缺乏症细胞系HepG2 降血脂作用

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Comment on the paper “An analysis of Chinese Super League partial results”, by david R Brillinger

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Science China Mathematics 2009年第6期52卷 1152-1154页

作者： lee Alan Department of Statistics University of Auckland Private Bag 920719 Auckland 1142 New Zealand

This paper gives a nice analysis of an interesting data set, and develops a method that can be applied to a variety of round-robin sports competitions. The paper models the result of a

关键词： Comment on the paper by david R Brillinger An analysis of Chinese Super League partial results

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Narrowing the focus:Therapeutic cell surface targets for refractory triple-negative breast cancer

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World Journal of Clinical Oncology 2020年第4期11卷 169-179页

作者： Narges K Tafreshi david L Morse Marie Catherine lee Department of Cancer Physiology Moffitt Cancer CenterTampaFL 33612United States Department of Physics University of South FloridaTampaFL 33612United States Division of Oncologic Sciences University of South FloridaTampaFL 33612 FLUnited States Comprehensive Breast Program Moffitt Cancer CenterTampaFL 33612United States

Triple-negative breast cancer(TNBC)is defined as a type of breast cancer with lack of expression of estrogen receptor,progesterone receptor and human epidermal growth factor 2 *** comparison to other types of breast cancer,TNBC characterizes for its aggressive behavior,more prone to early recurrence and a disease with poor response to molecular target *** TNBC is identified in only 25%-30%of American breast cancer cases annually,these tumors continue to be a therapeutic challenge for clinicians for several reasons:Tumor heterogeneity,limited and toxic systemic therapy options,and often resistance to current standard therapy,characterized by progressive disease on treatment,residual tumor after cytotoxic chemotherapy,and early recurrence after complete surgical ***-surface targeted therapies have been successful for breast cancer in general,however there are currently no approved cell-surface targeted therapies specifically indicated for ***,several cell-surface targets have been identified as candidates for treatment of TNBC and associated targeted therapies are in *** purpose of this work is to review the current clinical challenges posed by TNBC,the therapeutic approaches currently in use,and provide an overview of developing cell surface targeting approaches to improve outcomes for treatment resistant TNBC.

关键词： Breast cancer Triple negative Biomarker Cell surface Targeted therapy Chemorefractory

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Risk factors for cost-related medication non-adherence among older patients with diabetes

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World Journal of Diabetes 2014年第6期5卷 945-950页

作者： James X Zhang Jhee U lee david O Meltzer Section of Hospital Medicine Department of Medicinethe University of ChicagoChicago Department of Economics the University of ChicagoChicago Harris School of Public Policy the University of ChicagoChicago

AIM: To assess the risk factors for cost-related medication non-adherence(CRN) among older patients with diabetes in the United States. METHODS: We used data from the 2010 Health and Retirement Study to assess risk factors for CRN including age, drug insurance coverage, nursing home residence, functional limitations, and frequency of hospitalization. CRN was self-reported. We conducted multivariate regression analysis to assess the effect of each risk factor. RESULTS: Eight hundred and seventy-five(18%) of 4880 diabetes patients reported CRN. Age less than 65 years, lack of drug insurance coverage, and frequent hospitalization significantly increased risk for CRN. Limitation in both activities of daily living and instrumental activities of daily living were also generally associated with increased risk of CRN. Residence in a nursing home and Medicaid coverage significantly reduced ***: These results suggest that expandingprescription coverage to uninsured, sicker, and community-dwelling individuals is likely to produce the largest decreases in CRN.

关键词： Cost Medication Non-adherence Risk factors

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Peripheral vestibular system: Age-related vestibular loss and associated deficits

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Journal of Otology 2021年第4期16卷 258-265页

作者： Jennifer Coto Carmen L.Alvarez Ivette Cejas Brett M.Colbert Bonnie E.Levin Joshua Huppert Tatjana Rundek Carey Balaban Susan H.Blanton david J.lee david Loewenstein Michael Hoffer Xue Zhong Liu University of Miami Miller School of Medicine Department of OtolaryngologyMiamiFLUSA San Juan Bautista Medical School CaguasPRUSA Medical Scientist Training Program University of Miami Miller School of MedicineMiamiFLUSA University of Miami Miller School of Medicine Department of Neurology and the Evelyn F.McKnight Brain InstituteMiamiFLUSA University of Pittsburgh Departments of OtolaryngologyNeurobiologyCommunication Sciences&Disordersand BioengineeringPittsburghPAUSA University of Miami Miller School of Medicine Dr.John T.Macdonald Department of Human GeneticsMiamiFLUSA University of Miami Miller School of Medicine Department of Public Health SciencesMiamiFLUSA University of Miami Miller School of Medicine Department of Psychiatry and Behavioral SciencesMiamiFLUSA

Given the interdependence of multiple factors in age-related vestibular loss (e.g., balance, vision,cognition), it is important to examine the individual contributions of these factors with ARVL. While therelationship between the vestibular and visual systems has been well studied (Bronstein et al., 2015),little is known about the association of the peripheral vestibular system with neurodegenerative disorders (Cronin et al., 2017). Further, emerging research developments implicate the vestibular system asan opportunity for examining brain function beyond balance, and into other areas, such as cognition andpsychological functioning. Additionally, the bidirectional impact of psychological functioning is understudied in ARVL. Recognition of ARVL as part of a multifaceted aging process will help guide thedevelopment of integrated interventions for patients who remain at risk for decline. In this review, wewill discuss a wide variety of characteristics of the peripheral vestibular system and ARVL, how it relatesto neurodegenerative diseases, and correlations between ARVL and balance, vision, cognitive, and psychological dysfunction. We also discuss clinical implications as well as future directions for research, withan emphasis on improving care for patients with ARVL.

关键词： Peripheral vestibular system Age-related vestibular loss Balance Vision Cognitive Psychological

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Right versus left fully robotic live donor nephrectomy and open kidney transplantation:Does the laterality of the donor kidney really matter?

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Asian Journal of Urology 2023年第4期10卷 453-460页

作者： Brianna Ruch Deki Tsering Chandra Bhati Dhiren Kumar Muhammad Saeed Seung Duk lee Aamir Khan Daisuke Imai david Bruno Marlon Levy Adrian Cotterell Amit Sharma Hume-lee Transplant Center Virginia Commonwealth UniversityRichmondVAUSA Division of Transplant Surgery University of MarylandBaltimoreMDUSA

Objective Robotic-assisted live donor nephrectomy(LDN)is being gradually adopted across transplant *** left donor kidney is preferred over right due to anatomical factors and ease of *** aimed to study donor and recipient outcomes after robotic procurement and subsequent open implantation of right and left *** All fully robotic LDNs and their corresponding open kidney transplants performed at our center between February 2016 and December 2021 were retrospectively *** Out of 196 robotic LDN(49[right]vs.147[left]),10(5.1%)donors had intra-operative events(6.1%[right]vs.4.8%[left],p=0.71).None of the LDN required conversion to open *** operative times were comparable for the two ***(13.3%)was the most common post-operative *** was no mortality in either LDN ***,we report our outcomes on 156 recipients(39 right and 117 left allografts)excluding robotic implants,exports,and pediatric *** were no significant differences between right and left kidney recipients with respect to 1-year post-transplant patient survival(100.0%vs.98.1%,p=0.45)or graft survival(93.9%vs.97.1%,p=0.11),or delayed graft function(7.7%vs.5.1%,p=0.55).Conclusion Non-hand-assisted robotic live donor nephrectomies can be safely performed with excellent *** LDN was not associated with higher incidence of complications compared to left *** implantation of robotically procured right renal allografts was not associated with higher risk of recipient complications.

关键词： Robotics Laparoscopy Donor nephrectomy Complication Renal transplant Outcome

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