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波形或桁架式钢腹板的预应力钢混组合桥主梁的安全性能和使用性能评估

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钢结构(中英文) 2011年第1期 80-80页

作者： Kwang-hoe Jung Jong-Won Yi Jang-ho jay Kim

在许多国家,预应力混凝土箱梁被认为是中等跨径(30～50m)混凝土梁最有效的结构形式。但是当混凝土梁的单跨长度超过50m时,相对钢梁,混凝土箱梁自重问题成为其最大约束。因此,在韩国,中等跨径桥梁主要采用钢箱梁。在20世纪,研究者们多次... 详细信息

在许多国家,预应力混凝土箱梁被认为是中等跨径(30～50m)混凝土梁最有效的结构形式。但是当混凝土梁的单跨长度超过50m时,相对钢梁,混凝土箱梁自重问题成为其最大约束。因此,在韩国,中等跨径桥梁主要采用钢箱梁。在20世纪,研究者们多次尝试提高预应力混凝土箱梁结构的有效性,最终采用混凝土-钢混合梁以减轻结构自重。但是,混合桥采用不同类型钢腹板及不同连接形式,会引起结构安全性能和使用性能的变化。为了全面了解钢腹板梁及钢腹板连接形式的性能,对5根带腹板的预应力混凝土梁进行静力荷载试验。这5根试件中,有2根混合梁采用波形钢腹板,而另3根采用桁架式钢腹板。结果显示:通过加强钢腹板与预应力筋的连接节点,可以改善使用性能相关问题(开裂荷载和挠度)及安全性能相关问题(刚度和极限承载力)。

关键词：混合梁波形钢腹板桁架式钢腹板受弯承载力结构安全性能抗剪承载力使用性能

承受冲击压力的纤维加强混凝土板的改进效果的数值评价

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钢结构(中英文) 2010年第6期 88-88页

作者： Jin-Won Nam ho-Jin Kim Sung-Bae Kim Na-Hyun Yi Jang-ho jay Kim

为了加强结构承受冲击荷载的能力,应使用高性能材料(如纤维增强复合材料FRP)使结构具有足够的延性和强度。对基于冲击下材料动力反应的改进设计,应准确评价加强材料的效果。采用考虑大应变的材料模型和界面剥离失效模型的精确有限元分... 详细信息

为了加强结构承受冲击荷载的能力,应使用高性能材料(如纤维增强复合材料FRP)使结构具有足够的延性和强度。对基于冲击下材料动力反应的改进设计,应准确评价加强材料的效果。采用考虑大应变的材料模型和界面剥离失效模型的精确有限元分析方法评价纤维的改进效果。模拟了玻璃纤维加强的钢筋混凝土板在冲击压力下的反应,并利用以前的试验数据对有限元分析结果进行验证。

关键词：冲击荷载纤维增强复合材料改进效果大应变材料模型界面剥离失效模型钢筋混凝土精确的有限元分析

Optimisation of zeolite LTA synthesis from alum sludge and the influence of the sludge source

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Journal of Environmental Sciences 2021年第1期33卷 130-142页

作者： Alexandra Rozhkovskaya jay Rajapakse Graeme J.Millar School of Civil and Enuironmental Engineering Science and Engineering FacultyQueensland University oTechnologyBrisbaneQueensland 4000Australia Institute for Future Environments and School of Mechanical Medical and Process EngineeringQueensland Uniuersity of TechnologyBrisbaneQueensland 4000Australia

Generation of alum sludge(AS)at drinking water treatment plants represents an environmental liability and adds to the cost of water ***,this study explored the feasibility of using low and high carbon containing alum sludge from two water treatment plants to synthesize zeolite *** hypothesis was that zeolite LTA synthesis was dependant upon alum sludge source and that a range of strategies may be required to optimize zeolite *** characteristics such as morphology,phase composition,crystallinity,and particle size distribution were recorded."One pot"hydrothermal synthesis of precursor gel with molar composition 4.2 Na2O:Al2O3:1.2 SiO_(2):168 H2O at 80℃ for 3 hr resulted in 25 and 46 wt.%zeolite LTA from high and low carbonaceous sludge,*** to hydrothermal reaction stage it was discovered that ageing of the gel,addition of zeolite LTA seeds,ultrasonic treatment and calcination all promoted zeolite LTA *** of the alum sludge at 700℃ for 2 hr before hydrothermal synthesis resulted in particle size reduction and the highest amount of crystalline zeolite LTA:79 wt.%from low carbon sludge and 65 wt.%from high carbon ***,the zeolite crystallinity reported in this study was the higher than previous studies on this *** outlined approach may allow value adding of alum waste and produce a commodity which could be used locally by the water treatment plant as a water softener.

关键词： Alum sludge Zeolite LTA Ultrasonic Ageing Waste conversion

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Comparative effectiveness of combined antiplatelet treatments in acute minor ischaemic stroke

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Stroke & Vascular Neurology 2022年第1期7卷 13-21页

作者： Shina Kim Joon-Tae Kim Ji Sung Lee Beom Joon Kim Jong-Moo Park Kyusik Kang Soo Joo Lee Jae Guk Kim Jae-Kwan Cha Dae-Hyun Kim Tai Hwan Park Sang-Soon Park Kyung Bok Lee Jun Lee Keun-Sik hong Yong-Jin Cho hong-Kyun Park Byung-Chul Lee Kyung-ho Yu Mi Sun Oh Dong-Eog Kim Wi-Sun Ryu jay Chol Choi Jee-Hyun Kwon Wook-Joo Kim Dong-Ick Shin Sung-Il Sohn Jeong-ho hong Man-Seok Park Kang-ho Choi Ki-Hyun Cho Juneyoung Lee Hee-Joon Bae Department of Neurology Chonnam National University HospitalChonnam National University Medical SchoolGwangjuKorea Clinical Research Center Asan Institute for Life SciencesAsan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Neurology Cerebrovascular CenterSeoul National University Bundang HospitalSeongnamKorea Department of Neurology Uijeongbu Eulji Medical CenterEulji University School of MedicineUijeongbu-siKorea Department of Neurology Nowon Eulji Medical CenterEulji UniversitySeoulKorea Department of Neurology Eulji University HospitalEulji UniversityDaejeonKorea Department of Neurology Dong-a UniversityBusanKorea Department of Neurology Seoul Medical CenterSeoulKorea Department of Neurology Soonchunhyang University HospitalSeoulKorea Department of Neurology Yeungnam University HospitalDaeguKorea Department of Neurology Inje University Ilsan Paik HospitalInje University College of MedicineGoyangKorea Department of Neurology Hallym University Sacred Heart HospitalAnyangKorea Department of Neurology Dongguk University Ilsan HospitalGoyangKorea Department of Neurology Jeju National University HospitalJeju National University School of MedicineJejuKorea Department of Neurology University of Ulsan College of MedicineUlsanKorea Department of Neurology Chungbuk National University HospitalCheongjuKorea Department of Neurology Keimyung University Dongsan Medical CenterDaeguKorea Department of Biostatistics Korea University College of MedicineSeoulKorea

Background No study has thoroughly compared the effectiveness of combined antiplatelet treatments(other than clopidogrel–aspirin)versus clopidogrel–aspirin or aspirin alone for early secondary prevention in acute ischaemic *** We identified patients with acute,minor,non-cardiogenic ischaemic stroke treated with aspirin alone,clopidogrel–aspirin or other combination *** scores considering the inverse probability of treatment weighting were used to adjust for baseline *** primary outcome was the composite of all strokes(ischaemic or haemorrhagic),myocardial infarction and all-cause mortality at 3 *** Among 12234 patients(male:61.9%;age:65.5±13 years)who met the eligibility criteria,aspirin,clopidogrel–aspirin and other combination treatments were administered in 52.2%,42.9%and 4.9%of patients,*** the crude analysis,the primary outcome event at 3 months occurred in 14.5%of the other combination group,14.4%of the aspirin group and 13.0%of the clopidogrel–aspirin *** the weighted Cox proportional hazards analysis,the 3-month primary outcome event occurred less frequently in the clopidogrel–aspirin group than in the other combination group(weighted HR:0.82(0.59–1.13)),while no association was found between the aspirin group(weighted HR:1.04(0.76–1.44))or other combination group and the 3-month primary *** Other combined antiplatelet treatment,compared with aspirin alone or clopidogrel–aspirin,was not associated with reduced risks of primary composite vascular events or recurrent stroke during the first 3 months after ***,the results suggest that other combination treatments,particularly the cilostazol-based combination,may not be effective alternatives for clopidogrel–aspirin to prevent early vascular events in patients with acute minor *** exploration in clinical trials will be needed.

关键词： prevention treatment alone

Cognitive Profiles and Subtypes of Patients with Mild Cognitive Impairment: Data from a Clinical Follow-Up Study

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International Journal of Clinical Medicine 2012年第5期3卷 352-360页

作者： Kyung Won Park Eun-Joo Kim Hwan Joo Sung-Man Jeon Seong-ho Choi jay C. Kwon Byoung Gwon Kim Jae Woo Kim Department of Neurology Bong Seng Memorial Hospital Busan Department of Neurology Busan Medical Center Busan Department of Neurology Changwon Fatima Hospital Changwon Department of Neurology Dong-A University College of Medicine Dong-A University Medical Center Busan Department of Neurology Pusan National University Hospital Pusan National University School of Medicine and Medical Research Institute Busan Department of Neurology Wallace Memorial Baptist Hospital Busan Department of Preventive Medicine Dong-A University College of Medicine Busan

Background: Mild cognitive impairment (MCI) is a heterogeneous condition with a variety of clinical outcomes, the presence of which correlates with risk of Alzheimer’s disease as well as pre-clinical stages of other dementia subtypes. The aims of this study were to assess the specific patterns of cognitive profiles and to identify changes from baseline to 24 weeks in patients with MCI using detailed neuropsychological testing. Methods: We consecutively recruited 120 MCI patients at baseline according to the Petersen’s clinical diagnostic criteria, who were admitted to the Dementia and Memory Clinics. We analyzed patients who fulfilled both inclusion and exclusion criteria for MCI and classified them into four subtypes according to deficits in major cognitive domains;amnestic MCI single domain (aMCI-s), amnestic multiple domain MCI (aMCI-m), non-amnestic single domain MCI (naMCI-s) and non-amnestic multiple domain MCI (naMCI-m). Four groups of MCI were evaluated by a detailed neuropsychological battery test. Results: 83 patients with MCI at the 24-week follow-up were classified into four subtypes. The most frequent subtype was amnestic multi-domain MCI, with the frequency of MCI subtypes as follows: aMCI-s (n = 21, 25.3%), aMCI-m (n = 53, 63.9%), naMCI-s (n = 5, 6.0%) and naMCI-m (n = 4, 4.8%). In the major cognitive items of the SNSB-D, there were significant changes between the initial and follow-up tests in the domains of language, memory and the fron-tal/executive function (p < 0.05), except for attention, in all MCI patient subtypes. At 24-weeks follow-up, the conversion rate to Alzheimer’s disease was 2.4% (n = 2) from a subtype of amnestic multi-domain MCI. Conclusions: Our study revealed the most frequent subtype of MCI to be multiple domain amnestic MCI, with this subtype having a higher tendency of conversion to Alzheimer’s disease.

关键词： Mild Cognitive Impairment Alzheimer’s Dementia Neuropsychology Conversion

黄斑裂孔诊断的新方法:自体荧光检测(英文)

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国际眼科杂志 2003年第4期3卷 9-13页

作者： A.P.Ciardella G.C.Lee K.Langton J.Sparrow jay Klancnik S.Chang 美国丹佛科罗拉多大学丹佛医疗中心眼科美国纽约哥伦比亚大学Edward Harkness眼科研究所

目的评价自体荧光检测诊断黄斑裂孔的效果。方法应用自体荧光检测黄斑裂孔。对黄斑裂孔、手术修补术的患者(组1)和作为对照的黄斑假洞或黄斑皱褶的患者(组2),分别行眼底荧光血管造影、自体荧光检测、眼底彩照、无赤光和红外摄像检查,进... 详细信息

目的评价自体荧光检测诊断黄斑裂孔的效果。方法应用自体荧光检测黄斑裂孔。对黄斑裂孔、手术修补术的患者(组1)和作为对照的黄斑假洞或黄斑皱褶的患者(组2),分别行眼底荧光血管造影、自体荧光检测、眼底彩照、无赤光和红外摄像检查,进行回顾性研究。其中自体荧光采用132型Heidelberg眼球探针,对所得到的9个图象进行平均处理。而所有患者手术前后都进行OCTIII检测。结果10个术前被自体荧光检测发现的黄斑裂孔均由OCT确诊,而且所有病例的自体荧光信号均与黄斑裂孔相对应。自体荧光也可应用于术后,以评价裂孔的闭合程度。在OCT确诊裂孔闭合的所有患者以及对照组10例黄斑皱褶或假洞患者,均没有发现自体荧光。对照组均由OCT证实,没有黄斑裂孔的发生。结论自体荧光检测是诊断黄斑裂孔的一个新方法,它同时能够检测术后黄斑裂孔的封闭效果,没有自体荧光则表明裂孔已封闭。

关键词：黄斑裂孔诊断自体荧光检测手术眼球

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