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Structural performance of flexible freeform panelssubjected to wind loads

Frontiers of Structural and Civil Engineering 2024年第6期18卷 851-869页

作者： yong yoo Zaryab SHAHID Renzhe CHEN Maria KOLIOU Anastasia MULIANA Negar KALANTAR Zachry Department of Civil and Environmental Engineering Texas A&M UniversityCollege StationTX 77843USA J.Mike Walker'66 Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Architecture Division California College of the ArtsSan FranciscoCA 94107USA

An increased number of hurricanes and tornadoes have been recorded worldwide in the last decade,while research efforts to reduce wind-related damage to structures become *** architecture,which focuses on generating complex curved shapes including streamlined shapes,has recently gained *** study focuses on investigating the potential of kerf panels,which have unique flexibility depending on the cut patterns and densities,to generate complex shapes for facades and their performance under wind *** investigate the kerf panel's potential capacity against wind loads,static and dynamic analyses were conducted for two kerf panel types with different cut densities and pre-deformed *** was observed that although solid panels result in smaller displacement amplitudes,stresses,and strains in some cases,the kerf panels allow for global and local cell deformations resulting in stress reduction in various locations with the potential to reduce damage due to overstress in *** the predeformed kerf panels,it was observed that both the overall stress and strain responses in kerf cut arrangements were lower than those of the flat-shaped *** study shows the promise of the use of kerf panels in achieving both design flexibility and performance demands when exposed to service *** that this newly proposed architectural configuration(design paradigm)for facades could revolutionize structural engineering by pushing complex freeform shapes to a standard practice that intertwines aesthetic arguments,building performance requirements,and material design considerations has the potential for significant practical applications.

关键词： freeform structure kerfing method wind load analysis cladding component

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Effects of Acetylsalicylic Acid and Calcium Chloride on Photosynthetic Apparatus and Reactive Oxygen-Scavenging Enzymes in Chrysanthemum Under Low Temperature Stress with Low Light

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Agricultural Sciences in China 2010年第12期9卷 1777-1786页

作者： FENG Zhen LIANG Fang ZHENG Cheng-shu SHU Huai-rui SUN Xian-zhi yoo yong-kweon College of Horticulture Science and Engineering Shandong Agricultural University Tai＇an 271018 P.R.China State Key Laboratory of Crop Biology Shandong Agricultural University Tai＇an 271018P.R.China National Apple Engineering Technique Center Tai＇an 271018 P.R.China College of Natural Sciences Mokpo Nationeal University Moo an Junramamdo 534-729 P.R.Korea

The effects of acetylsalicylic acid （ASA）, CaCl2, and ASA ＋ CaCl2 on the photosynthetic apparatus and antioxidant enzyme activities were investigated in chrysanthemum Jinba （a cut flower cultivar） under low temperature stress with low light （TL stress）（16/12℃, day/night, PFD 100 μmol m^-2 s-1）. The results showed that under TL stress, the net photosynthesis rate （Pn）, carboxylation efficiency （CE）, apparent quantum yield （AQY）, maximal photochemical efficiency （Fv/Fm） of PSII, quantum yield of PSII electron transport （ФPSII）, and photochemical quenching （qP） of the chrysanthemum leaves in all treatments were significantly decreased, but the decreases were alleviated by ASA, CaCl2, and ASA ＋ CaCl2 treatments compared with the controls. The alleviating effect of ASA ＋ CaCI2 was better than either ASA or CaCl2 single treatment. Moreover, the ASA ＋ CaCl2 treatment highly improved the chlorophyll content, relatively improved the number and size of chloroplast and starch grain in the leaves of chrysanthemum plants compared with ASA and CaCl2 treatments. It was indicated that ASA and/or CaCI2 could regulate the photosynthetic functions in the leaves of chrysanthemum plants to enhance the resistance against TL stress. On the other hand, reduction in relative conductance rate implied that ASA and/ or CaCl2 could protect from membrane injury in leaves of chrysanthemum plants. The activities of SOD, POD, and CAT in the treated leaves of chrysanthemum were increased as compared with the controls. It was suggested that ASA and/or CaCl2 had positive regulation effects on the defence enzyme activities in chrysanthemum leaves which could protect the photosynthetic apparatus to a certain degree under the TL stress. In brief, the treatment of ASA together with CaCl2 was better for chrysanthemum plants to adapt TL stress than single ASA or CaCl2 treatments.

关键词： acetylsalicylic acid Ca^2+ chrysanthemum low temperature low light photosynthetic apparatus antioxidantenzyme

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The Effect of Ca addition on the Corrosion Behavior of Weathering Steel for Coastal Environment

The Effect of Ca addition on the Corrosion Behavior of Weath...

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第二届先进钢铁结构材料国际会议

作者： Hwan Gyo Jung Jang yong yoo Plate Research Group Technical Research Laboratories POSCO Pohang P.O. Box 36 Korea

The current research efforts of alloy design for advanced weathering steel are mainly focused on the formation of a dense and stable rust layer even in high Cl environments. The main role of Ca with respect to corrosion properties is the formation of CaO and CaS, which can dissolve significantly in thin water film condensed on the steel surface. Dissolution of CaO and CaS increases the alkalinity of thin water film, which enhances the formation of a dense and protective α-FeOOH in the rust. However, the (Al, Si, Ca)O type complex oxides do not attribute to increase pH value of the water film covered on the Ca-modified steel. Therefore, the important factor to increase pH value of the water film on the Ca-modified weathering steel is not content of total Ca but fraction of inclusions which are soluble under the water film. The rust layers containing Ni Mo and W lowered the permeability of Cl ions through the rust layer. It has an industrial significance for alloy design of the weathering steel since design of a lower cost weathering steel with higher corrosion resistance can be possible with addition of Mo or W instead of increasing the high cost Ni content to 2% or even higher.

关键词： Ca-modified Weathering Steel Ph Increase Water Soluble Inclusion

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Treatment of Bone Defect with Modular Metal Augmentation Using a Downsized Block in Total Knee Arthroplasty: Technical Note and Report of 17 Cases

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Open Journal of Orthopedics 2016年第9期6卷 268-275页

作者： Su Chan Lee Chang Hyun Nam Seung Hyun Hwang Ji-Hoon Baek Soon yong yoo Hye Sun Ahn Joint & Arthritis Research Department of Orthopaedic Surgery Himchan Hospital Seoul Korea

In total knee arthroplasty (TKA), a treatment of bone defect varies depending on the location and extent of defect and requires proper surgical procedure. Metal augmentation is readily available for both femoral and tibial bone defects. We report the operative technique of modular metal augmentation using a downsized block for ambiguous proximal tibial and distal femoral bone defects in primary and revision TKA. Regarding bone defects, bone loss can be minimized by using a different size of metal augmentation, and suitable reinforcement for bone defects can be achieved. Once our technique is properly used, it will be very helpful in treating bone defects.

关键词： Total Knee Arthroplasty Bone Defect Metal Augmentation

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The expression of DNA damage checkpoint proteins and prognostic implication in metastatic brain tumors

The expression of DNA damage checkpoint proteins and prognos...

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中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Do-Hyun Nam Ho Jun Seol Hae yong yoo Juyoun Jin Kyeung Min Joo Jung-II Lee Department of Neurosurgery Samsung Biomedical Research Instituteand Cancer Stem Cell Research CenterSamsung Medical CenterSungkyunkwan University School of Medicine

Resistance to radiation is a possible cause of recurrence or treatment failure in brain *** expression of the DNA damage checkpoint pathway components was investigated in cell lines and metastatic brain tumor（MBT） *** association between the expression levels and survival outcome were evaluated to find out possible therapeutic targets in brain *** of human non-small cell lung cancer cell lines was determined by checking their viability after treatment with varying doses of ionizing radiation（IR）.The expression of DNA checkpoint proteins were analyzed by Western blots and *** the basis of the clinical data for the MBT patients,the association between the expression of the components and patients’ survival was *** expression levels of TopBP1 and Chk1 protein were higher in radioresistant lung cancer cell line compared to radiosensitive cell *** activity of Chk1 in response to IR was also higher in radioresistant cell lines than in radiosensitive cell *** assessed radiation survival of lung cancer cell lines after treating them with Chk1 inhibitor,***7762 significantly sensitized both radioresistant and radiosensitive cells to *** also observed a strong inverse relationship between progression-free survival（PFS） and expression level of phosphorylated Chk1（P-Chk1） and *** association between the PFS and the expression of TopBP1 and P-Chk1 was observed for the first *** further investigation for understanding the role of these proteins are necessary,these two DNA damage checkpoints proteins can be promising targets for enhancing therapeutic potentials in the MBTs.

关键词： DNA damage checkpoint metastatic brain tumor P-Chk1 radioresistance TopBP1

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浅层岩土蓄能加浅层地温能才是地源热泵可持续利用的低温热源

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暖通空调 2009年第2期39卷 70-72页

作者：董菲倪龙姚杨姜益强马最良哈尔滨工业大学

当前对地源热泵低温热源的认识存在分歧,并有将浅层地能资源化的趋势。通过对土壤源热泵低温热源认识过程的回顾,结合我国地源热泵发展的实际情况,提出了浅层岩土蓄能加浅层地温能才是地源热泵可持续利用低温热源的观点。认为应基于浅... 详细信息

当前对地源热泵低温热源的认识存在分歧,并有将浅层地能资源化的趋势。通过对土壤源热泵低温热源认识过程的回顾,结合我国地源热泵发展的实际情况,提出了浅层岩土蓄能加浅层地温能才是地源热泵可持续利用低温热源的观点。认为应基于浅层岩土层储能的思路去研究和发展地源热泵。根据冬季供热的需要和当地的地质构造决定夏季的蓄热量,并采用先进技术保证热能蓄存。

关键词：浅层地温能浅层岩土蓄能地源热泵低温热源资源

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X80级热轧板卷与中厚板的机械性能及微观组织

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焊管 2005年第2期28卷 61-66页

作者： Jang-yong yoo Jin-Ho Bae Kisoo Kim Choong-Myeong Kim Ki-Bong Kang 浦项钢铁公司技术研究所韩国浦项545-090

韩国浦项钢铁公司(POSCO)为响应市场需求,开发了具有良好低温韧性的X80钢级热轧板卷及中厚板。对开发的 14. 6mm厚热轧板卷及用其所制造的螺旋焊管的微观组织进行了分析后认为:X80级钢的微观组织以针状铁素体为主。并对板卷和螺旋焊管... 详细信息

韩国浦项钢铁公司(POSCO)为响应市场需求,开发了具有良好低温韧性的X80钢级热轧板卷及中厚板。对开发的 14. 6mm厚热轧板卷及用其所制造的螺旋焊管的微观组织进行了分析后认为:X80级钢的微观组织以针状铁素体为主。并对板卷和螺旋焊管进行了一系列机械性能试验,结果显示开发的X80级热轧板卷的各项性能均满足了标准要求。对开发的X80级、15. 6mm和 17. 4mm中厚钢板及用其所制造的钢管也进行了相关的机械性能试验,结果表明:以针状铁素体和微小的多边形铁素体的复合组织构成的该X80钢也同样具有较高的强度和韧性,能满足标准要求。

关键词：针状铁素体微观组织中厚板螺旋焊管 POSCO 热轧板卷低温韧性韩国浦项钢铁公司钢级市场需求

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Efficient thermal management and all-season energy harvesting using adaptive radiative cooling and a thermoelectric power generator

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能源化学:英文版 2023年第9期84卷 496-501页

作者： Chanil Park Woohwa Lee Choyeon Park Sungmin Park Jaeho Lee yong Seok Kim Youngjae yoo Advanced Materials Division Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea Department of Mechanical and Aerospace Engineering University of CaliforniaIrvineCA 92617United States Department of Advanced Materials Engineering Chung-Ang UniversityAnseong 17546Republic of Korea

Passive daytime radiative cooling(PDRC) is useful for thermal management because it allows an object to emit terrestrial heat into space without the use of additional *** produce sub-ambient temperatures under direct sunlight,PDRC materials are designed to reduce their absorption of solar energy and to enhance their long-wavelength infrared(LWIR) *** recent years,many photonic structures and polymer composites have been studied to improve the cooling system of ***,in cold weather(i.e. during winter in cold climates),buildings need to be kept warm rather than cooled due to heat *** overcome this limitation,temperature-responsive radiative cooling is a promising *** the present study,adaptive radiative cooling(ARC) film fabricated from a polydimethylsiloxane/hollow SiO_(2) microsphere/thermochromic pigment composite was *** found that the ARC film absorbed solar radiation under cold conditions while exhibiting radiative cooling at ambient temperatures above 40℃.Thus,in outdoor experiments,the ARC film achieved sub-ambient temperatures and had a theoretical cooling power of 63.2 W/m~2 in hot *** also demonstrated that radiative cooling with an energy harvesting system could be used to improve the energy management of buildings,with the thermoelectric module continuously generating output power using the ARC ***,we believe that our proposed ARC film can be employed for efficient thermal management of buildings and all-season energy harvesting in the near future.

关键词： Thermal management Daytime radiative cooling Temperature-adaptive film Thermoelectric device Energy harvesting

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菊花不同花期及花序不同部位香气成分和挥发研究

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西北植物学报 2012年第4期32卷 722-730页

作者：徐瑾李莹莹郑成淑王超俞用权山东农业大学园艺科学与工程学院/作物生物学国家重点实验室山东泰安271018 菏泽学院园林工程系山东菏泽274015 韩国木浦大学园艺学科全南务安534729

以切花菊品种‘神马’为试材,采用顶空-固相微萃取和气相色谱-质谱联用(GC/MS)技术,分别测定菊花不同花期及花序不同部位的香气成分种类和含量,并利用生物显微镜观察花瓣的表皮细胞和横切面组织细胞的结构特征。结果表明:(1)菊花花蕾期... 详细信息

以切花菊品种‘神马’为试材,采用顶空-固相微萃取和气相色谱-质谱联用(GC/MS)技术,分别测定菊花不同花期及花序不同部位的香气成分种类和含量,并利用生物显微镜观察花瓣的表皮细胞和横切面组织细胞的结构特征。结果表明:(1)菊花花蕾期共检测到香气成分24种,始花期31种,盛花期43种,终花期22种;随着花朵的开放和凋谢,酮类、萜烯类和醇类化合物的含量呈先上升后下降的趋势,在盛花期含量达到最高,而酯类、醛类和杂环类化合物则呈持续下降的趋势。(2)盛花期,在舌状花中共检测到香气成分种类31种,在管状花中共检测到50种;舌状花对菊花香气的贡献比管状花大;菊花舌状花由内轮向外轮香气成分种类变化不大,但是同类香气成分含量的变化出现由内轮向外轮逐渐减少的趋势。(3)异环柠檬醛、桉叶醇、α-蒎烯、β-金合欢烯和石竹烯等化合物可能为菊花的主要特征香气成分。(4)显微观察结果表明:舌状花的香气可能是通过表皮细胞间隙释放的,上表皮是菊花释放香气的主要部位。

关键词：菊花花期花序香气成分 GC/MS技术解剖结构

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Resolution-enhanced X-ray fluorescence microscopy via deep residual networks

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npj Computational Materials 2023年第1期9卷 1935-1942页

作者： Longlong Wu Seongmin Bak Youngho Shin yong S.Chu Shinjae yoo Ian K.Robinson Xiaojing Huang Computational Science Initiative Brookhaven National LaboratoryUptonNY 11973USA Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA National Synchrotron Light Source II Brookhaven National LaboratoryUptonNY 11973USA Materials Engineering Research Facility Applied Materials DivisionArgonne National LaboratoryLemontIL 60439USA London Centre for Nanotechnology University College LondonLondon WC1E 6BTUK

Multimodal hard X-ray scanning probe microscopy has been extensively used to study functional materials providing multiple contrast *** instance,combining ptychography with X-ray fluorescence(XRF)microscopy reveals structural and chemical properties *** ptychography can achieve diffraction-limited spatial resolution,the resolution of XRF is limited by the X-ray probe ***,we develop a machine learning(ML)model to overcome this problem by decoupling the impact of the X-ray probe from the XRF *** enhanced spatial resolution was observed for both simulated and experimental XRF data,showing superior performance over the state-of-the-art scanning XRF method with different nano-sized X-ray *** spatial resolutions were also observed for the accompanying XRF tomography *** this probe profile deconvolution with the proposed ML solution to enhance the spatial resolution of XRF microscopy will be broadly applicable across both functional materials and biological imaging with XRF and other related application areas.

关键词： resolution overcome instance

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