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国外超高碳钢的研究进展 被引量:16
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作者 罗光敏 吴建生 +2 位作者 史海生 林一坚 章靖国 《材料热处理学报》 EI CAS CSCD 北大核心 2003年第1期14-18,共5页
超高碳钢 (Ultrahighcarbonsteels简称为UHCS)是指含碳量为 1 .0 %~ 2 .1 %的过共析钢 ,具有高的超塑性和良好的综合力学性能。本文综述了国外超高碳钢的研究成果 ,包括超塑性及超塑处理工艺、合金元素的作用、力学性能及层状复合超高... 超高碳钢 (Ultrahighcarbonsteels简称为UHCS)是指含碳量为 1 .0 %~ 2 .1 %的过共析钢 ,具有高的超塑性和良好的综合力学性能。本文综述了国外超高碳钢的研究成果 ,包括超塑性及超塑处理工艺、合金元素的作用、力学性能及层状复合超高碳钢 。 展开更多
关键词 超高碳钢 uhcs 超塑性 力学性能 合金元素 研究进展 国外
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1.4%C超高碳钢显微组织与疲劳性能的研究 被引量:7
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作者 朱杰武 许雁 +1 位作者 葛利玲 柳永宁 《材料热处理学报》 EI CAS CSCD 北大核心 2004年第3期30-33,共4页
对 1.4 %C超高碳钢试样热处理后的疲劳极限与断裂韧性进行测定 ,观察了显微组织与试样断口。结果表明 ,经 95 0℃淬火 70 0℃回火热处理后 ,又经 86 0℃正火处理 ,试验用钢的组织结构超细化且碳化物弥散均匀分布 ,获得良好的综合强度与... 对 1.4 %C超高碳钢试样热处理后的疲劳极限与断裂韧性进行测定 ,观察了显微组织与试样断口。结果表明 ,经 95 0℃淬火 70 0℃回火热处理后 ,又经 86 0℃正火处理 ,试验用钢的组织结构超细化且碳化物弥散均匀分布 ,获得良好的综合强度与韧性及较高的疲劳极限 ,断裂强度较 4 0CrNiMo调质态提高 4 8% ,屈服强度提高 15 % ,延性指标相当 ,是一种优良的结构钢材料。 展开更多
关键词 超高碳钢(uhcs) 显微组织 碳化物 疲劳极限 断裂韧度
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超细晶超高碳钢的化学成分设计 被引量:7
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作者 石淑琴 张振忠 陈光 《兵器材料科学与工程》 CAS CSCD 2002年第6期57-60,共4页
超细晶超高碳钢是国外近年来发展起来的一种新型的、并具有重要发展前景的高性能钢铁材料。通过系统总结碳及各合金元素在超细晶超高碳钢中的作用及其对该材料各种性能影响的基础上 ,对超细晶超高碳钢中的化学成分进行了设计。
关键词 超细晶超高碳钢 化学成分 设计 uhcs
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超高碳钢石墨化的热力学分析及研究 被引量:3
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作者 罗光敏 吴建生 +3 位作者 樊俊飞 史海生 林一坚 章靖国 《材料热处理学报》 EI CAS CSCD 北大核心 2004年第3期42-45,共4页
对喷射态超高碳钢和普通铸造的母合金 1 2 5C 3 0Si 1 5Cr进行了热轧试验 ,发现在渗碳体和奥氏体双相区热轧时有条状石墨生成。喷射态超高碳钢较母合金中的石墨数量少且石墨较细。从热力学角度分析了元素对石墨化的影响 ,得出变形可促... 对喷射态超高碳钢和普通铸造的母合金 1 2 5C 3 0Si 1 5Cr进行了热轧试验 ,发现在渗碳体和奥氏体双相区热轧时有条状石墨生成。喷射态超高碳钢较母合金中的石墨数量少且石墨较细。从热力学角度分析了元素对石墨化的影响 ,得出变形可促进石墨的形成。通过控制化学成分 ,选择合理的热轧工艺减小碳的偏析 ,可有效抑制石墨的生成。 展开更多
关键词 超高碳钢(uhcs) 石墨化 热力学
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燃气轮机燃烧室空气加湿燃烧的实验研究 被引量:8
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作者 房爱兵 王岳 +1 位作者 徐纲 肖云汉 《工程热物理学报》 EI CAS CSCD 北大核心 2005年第4期713-716,共4页
空气加湿燃烧是HAT循环的关键技术。本文通过中压全尺寸燃气轮机燃烧室空气加湿燃烧实验,研究了加湿度对燃烧特性的影响。实验中发现,燃烧室内温度分布、出口温度场、污染物生成(即NOx、CO、UHC)及燃烧稳定性都受到加湿度的影响。研究... 空气加湿燃烧是HAT循环的关键技术。本文通过中压全尺寸燃气轮机燃烧室空气加湿燃烧实验,研究了加湿度对燃烧特性的影响。实验中发现,燃烧室内温度分布、出口温度场、污染物生成(即NOx、CO、UHC)及燃烧稳定性都受到加湿度的影响。研究结果表明,空气加湿燃烧导致NOx排放显著下降, CO和UHC排放略有上升,燃烧室中压力振荡的频谱产生了变化,燃烧室出口温度场畸变加剧。作者从水蒸气影响燃烧的机理出发对实验结果进行了分析和解释。 展开更多
关键词 加湿燃烧 NOX排放 UHC排放 燃烧稳定性
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超高强混凝土管桩(UHC)基础设计探讨 被引量:2
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作者 王琪 《工程建设与设计》 2022年第11期36-39,共4页
混凝土强度等级为C80的普通预应力高强混凝土管桩(PHC)已满足不了市场的要求。为了能够满足建筑市场的需求,需提高混凝土管桩强度。基于具体工程实例,就福建省发布的T13/FJECSA003—2019《预制桩工程技术规程》附录F中所纳入的混凝土强... 混凝土强度等级为C80的普通预应力高强混凝土管桩(PHC)已满足不了市场的要求。为了能够满足建筑市场的需求,需提高混凝土管桩强度。基于具体工程实例,就福建省发布的T13/FJECSA003—2019《预制桩工程技术规程》附录F中所纳入的混凝土强度等级更高的两种超高强预应力混凝土管桩UHC(C105,C125)进行了分析。通过分析可知,这两种新桩型可以有效满足高承载能力预制桩型的需求。 展开更多
关键词 超强混凝土 高承载力 UHC桩 基础设计
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V93K超大电流DPS板UHC4应用初探 被引量:4
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作者 陆晔 刘岩 张大成 《计算机与数字工程》 2010年第9期98-100,共3页
简述了V93K测试系统中超大电流DPS板UHC4的基本功能,包括供电方式、上电与下电特性。介绍了UHC4在实际应用中硬件配置、供电方式与模式的基本方法,并对该板的主要功能、工作特性和工程应用实践进行了初步探讨。
关键词 UHC4供电方式 上电与下电特性 UHC4应用
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基于不均等分层分簇的无线传感器网络协议 被引量:2
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作者 张智超 《电子科技》 2015年第3期83-86,共4页
针对不均等分簇协议中节点竞选半径和簇头的选取机制存在缺陷问题,提出了不均等分层分簇协议,将网络覆盖区域进行分层处理,降低了簇头簇内负担,提高了能量使用效率,并采用Matlab软件进行了仿真实验。仿真结果表明,UHC协议有效降低了簇... 针对不均等分簇协议中节点竞选半径和簇头的选取机制存在缺陷问题,提出了不均等分层分簇协议,将网络覆盖区域进行分层处理,降低了簇头簇内负担,提高了能量使用效率,并采用Matlab软件进行了仿真实验。仿真结果表明,UHC协议有效降低了簇内节点密度,且延长了网络使用寿命。 展开更多
关键词 无线传感器网络 UHC协议 EEUC协议
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V93K测试平台UHC4电源板卡的DUT板设计 被引量:4
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作者 孔锐 王建超 +1 位作者 苏洋 李斌 《电子与封装》 2019年第12期12-16,共5页
UHC4电源板卡作为V93K测试平台常用的板卡之一,可实现对大电流、高功率电路的测试。简述了UHC4电源板卡的位置结构、工作模式、管脚定义等基本特性。通过电源完整性分析,对UHC4板卡的DUT板设计进行初步探讨,以实现更精确的测试要求,减... UHC4电源板卡作为V93K测试平台常用的板卡之一,可实现对大电流、高功率电路的测试。简述了UHC4电源板卡的位置结构、工作模式、管脚定义等基本特性。通过电源完整性分析,对UHC4板卡的DUT板设计进行初步探讨,以实现更精确的测试要求,减小由于不恰当的DUT板设计造成的测试偏差。 展开更多
关键词 UHC4板卡结构 管脚定义 电源完整性分析 DUT板设计
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索尼UHC-8300助力阅兵盛典4K流程
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作者 杨秀森 《中国电化教育》 CSSCI 北大核心 2019年第12期144-144,共1页
天安门的盛世欢歌已经圆满落下帷幕,打造大美的视觉盛宴索尼也身在其中。本次阅兵实时现场直播是一次4K全流程的大手笔制作,使用了数辆索尼制造的大型转播车,配置了多达91讯道的索尼4K摄像机,包括了HDC-4300、PXW-Z580、HDC-P50等。除... 天安门的盛世欢歌已经圆满落下帷幕,打造大美的视觉盛宴索尼也身在其中。本次阅兵实时现场直播是一次4K全流程的大手笔制作,使用了数辆索尼制造的大型转播车,配置了多达91讯道的索尼4K摄像机,包括了HDC-4300、PXW-Z580、HDC-P50等。除了天上、地上的这六大转播系统之外,广场周围还架设了数个8K机位,或单机录制、或进行了讯道系统全流程摄录测试和演练。 展开更多
关键词 转播系统 转播车 现场直播 摄录 视觉盛宴 UHC 全流程 索尼
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Universal Health Coverage: Factoring Successful Economies
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作者 Prerna Bhasin Rakesh Bhardwaj 《Health》 2018年第7期1018-1030,共13页
Countries are seeking to diversify sources of revenue for Universal Health Coverage (UHC), and strategies vary among countries at different stages on the road to UHC. The study tends to document these trade-offs by fa... Countries are seeking to diversify sources of revenue for Universal Health Coverage (UHC), and strategies vary among countries at different stages on the road to UHC. The study tends to document these trade-offs by factoring successful economies across the globe. A review of peer-reviewed literature retrieved country-wise on the basis of successful UHC economies to establish the major factor associated with development of UHC. Political will has been recognized as one of the critical factors. Overcoming barriers associated with development of an adequate and sustainable financing mechanism and selecting the right package of services are other essential determinants. Reaching vulnerable groups and efficient use of resources were other factors that contributed to UHC development in Mexico and south-east Asian countries. UHC development is at threshold where nations should learn from one another, especially from those systems which appear to be doing better, and are more prepared to innovate, test and evaluate new approaches. 展开更多
关键词 UHC Global EQUITY Health-Systems ECONOMIES
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Evaluation of the Fetal Neuroprotection Protocol with Magnesium Sulphate in a University Hospital in Burkina Faso
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作者 Timongo Francoise Danielle Millogo-Traoré Oumarou Sawadogo S. W. Zongo-Kondé 《Open Journal of Obstetrics and Gynecology》 CAS 2022年第10期1042-1055,共14页
Introduction: Prematurity continues to stand as a major public health issue worldwide and more particularly for low incomes countries like Burkina Faso. Indeed, it is the main cause of high death rate and infant morbi... Introduction: Prematurity continues to stand as a major public health issue worldwide and more particularly for low incomes countries like Burkina Faso. Indeed, it is the main cause of high death rate and infant morbidity, neurologic deficiencies being one of them. Objective: From March 1st to September 30th, 2020, evaluate the fetal neuroprotection protocol using sulfate magnesium during births before thirty-three (33) weeks of amenorrhea at the University Health Centers (UHC) of Yalgado Ouedraogo and Bogodogo in Ouagadougou, Burkina Faso. Patients and Methods: It was a prospective cohort survey, exposed or unexposed. The exposed ones are from the UHC of Yalgado Ouedraogo, while the unexposed ones are from the UHC of Bogodogo. Analysis of the results showed 87 newborns from the exposed and 180 from the unexposed. The mortality rate, as well as neonatal neurologic complications, was higher with unexposed than with exposed. Although antenatal exposure to magnesium sulfate was not statistically associated with mortality and morbidity in newborns at a threshold of 0.05%, it has shown an overall good neurological prognosis in newborns exposed. Conclusion: A survey of a large sample of the population would be relevant in order to better assess the determinants of this influence. Proposition: In light of the results, the use of magnesium sulfate for neuroprotective purposes could be considered in our countries. 展开更多
关键词 Premature Delivery Fetal Neuroprotection Sulfates Magnesium UHC of Yal-gado Ouedraogo UHC of Bogodogo Burkina Faso
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Assessment of Haemostasis in Anaesthesia for Surgery at the Sylvanus Olympio University Hospital Center in Lomé
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作者 Essohanam T. Mouzou Sarakawabalo Assénouwè +2 位作者 Abd El Kader Moumouni Pikabalo Tchètikè Akala-Yoma Gnimdou 《Open Journal of Anesthesiology》 2021年第6期184-193,共10页
<b>Title:</b> Assessment of haemostasis in anaesthesia for surgery at the Sylvanus Olympio University Hospital Center in Lomé. <b>Objectives:</b> Evaluate the prescription of the preoperat... <b>Title:</b> Assessment of haemostasis in anaesthesia for surgery at the Sylvanus Olympio University Hospital Center in Lomé. <b>Objectives:</b> Evaluate the prescription of the preoperative haemostasis assessment. <b>Methodology:</b> This was a prospective descriptive and observational study which had taken place in the central operating room and in the operating room of the ENT department at UHC SO of Lomé from January 1 to June 31, 2016. It had concerned all patients who had anaesthesia for scheduled surgery after pre-anesthetic consultation and the haemostasis assessment carried out according to the anaesthesia technique and the type of surgery. <b>Results:</b> Two hundred and sixty (260) patients underwent anaesthesia during the study period. The male sex predominated (60%), the age group 18 - 40 years predominated (50.4%). GA was more practiced (62.7%) followed by spinal anaesthesia (30.3%). Minor ENT surgery was more performed (28%). ASA1 patients predominated (48.5%). The pre-anesthetic haemostasis assessment including platelet count, prothrombin rate, activated partial thromboplastin time and bleeding time was almost always done. The platelet count was achieved in all patients followed by the activated partial thromboplastin time (94%). No haemorrhagic complication related to a haemostasis disorder was observed in the perioperative period in anaesthesia than in surgery. <b>Conclusion:</b> The prescription of the pre-anesthetic haemostasis assessment should not be systematic. It must take into account the clinical history, the patient’s bleeding history during the anaesthesia consultation, the type of anaesthesia, the surgery planned and the age. 展开更多
关键词 Haemostasis Assessment ANAESTHESIA SURGERY UHC Lomé
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Contributions of Social Networks to Health and Care Services in Myanmar’s Older Adult Population: 2012 Myanmar Aging Study
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作者 Paul Kowal Min Nwe Tun +1 位作者 Sai Kham Leik Ilaria Rocco 《Health》 2021年第12期1530-1545,共16页
Background: Myanmar’s National Health Plan 2017-2021 set out concrete steps to strengthen the health system on the way to achieving the goal of universal health coverage by 2030. Ensuring these steps include the 7.7 ... Background: Myanmar’s National Health Plan 2017-2021 set out concrete steps to strengthen the health system on the way to achieving the goal of universal health coverage by 2030. Ensuring these steps include the 7.7 million older adults in Myanmar’s population by 2030 will require novel strategies that improve health and reduce financial burden of health expenditures. An examination of the relationship between social networks and selected health outcomes was undertaken to determine whether these networks can safeguard older adults’ continued contributions to family, society and their own health. Methods: Secondary analysis of a nationally representative study of adults aged 60 years and older. Ordered logistic regression analyses with weighted data were used to examine the relationship between a social network variable and a number of health outcomes. Findings: Stronger social networks were associated with better health outcomes like better memory (OR 1.2), lower reported walking difficulties (OR 0.58), better self-reported health (R 1.15). People with higher social ties were also more like to receive regular assistance and provide care for other household members. Interpretation: Social networks play a role in mediating health outcomes and interactions with the health care systems. Social network interventions should be explored as part of policy mechanisms to ensure universal health coverage for older adults in Myanmar. 展开更多
关键词 Myanmar Ageing HEALTH Health Policy Social Networks UHC UN SDGs
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ICT-Enabled Universal Health Coverage Monitoring and Evaluation in Sub-Saharan Health Facilities: Study in 8 Reference Hospitals of Rwanda, Burundi, the Democratic Republic of Congo and Mali
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作者 Gustave Karara Frank Verbeke Marc Nyssen 《Journal of Health Science》 2017年第5期215-226,共12页
Abstract: UHC (Universal Health Coverage) is at the center of the Sustainable Development Agenda. In this study, the authors made an evaluation of the indicators allowing quantification of the impact of health cove... Abstract: UHC (Universal Health Coverage) is at the center of the Sustainable Development Agenda. In this study, the authors made an evaluation of the indicators allowing quantification of the impact of health coverage schemes on patients, applied in 4 sub-Saharan Africa countries: Rwanda, Burundi, the DRC (Democratic Republic of Congo) and Mall After an analysis of potential health coverage indicators, the most relevant ones were calculated on the basis of patient administrative and health insurance data, collected via OpenClinic GA, an HIMS (health information management system) used in 8 sub-Saharan hospitals during the period 2010-2016. The results show that the PHSC (patient health services coverage) rate is highest (81.5%-92.7%) in the 2 hospitals of Rwanda and in 2 hospitals of Burundi (37.7%-77.7%). The PHSP (patient health service payment) rate as the proportion of costs paid by the patient versus total health service costs is below the 25% threshold recommended by WHO only for the 2 hospitals in Rwanda. The POOP (patient out-of-pocket) payment is below the threshold of 180USD per patient per year for all hospitals. The HIEXs (health insurance expenditures) are funded by the university private insurance (86% of expenses covered) in 2 university teaching hospitals in DRC, by CBHI (community based health insurance) (69%) in 2 hospitals in Rwanda, by the free care policy (77%) in 2 hospitals in Burundi and by the SHI (social health insurance) (100%) in the 2 hospitals in Mali. PHSC in the 8 reference hospitals reflects the national trend towards UHC in each country. With this study, we demonstrate the possibility to assess the degree of UHC in developing countries, by a methodology based on indicators calculated via information extraction from routine data in electronic health records. 展开更多
关键词 UHC health insurance schemes patient health coverage indicators sub-Saharan reference hospitals.
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Insight of effects of air quality and sustainable aviation fuel blend on energy saving and emission reduction in airport
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作者 Ziyu Liu Sha Yu Xiaoyi Yang 《Bioresources and Bioprocessing》 2024年第1期1115-1129,共15页
Air quality in airport attracts a widespread attention due to the emission of GHGs and pollutants related with aircraft flight.Sustainable aviation fuel(SAF)has confirmed PM2.5 reduction due to free of aromatics and s... Air quality in airport attracts a widespread attention due to the emission of GHGs and pollutants related with aircraft flight.Sustainable aviation fuel(SAF)has confirmed PM2.5 reduction due to free of aromatics and sulphur,and thus air quality improvement in airport is prospected by SAF blend.Two types of SAF were assessed the potential of energy saving and emission reduction by ZF850 jet engine.FT fuel is characterized with only paraffins without aromatics and cycloparaffins while HCHJ fuels is characterized with no aromatics.The descend of air quality and SAF blend were both investigated the effect on the engine performance and emission characteristic.The critical parameters were extracted from fuel compositions and air pollutants.Ambient air with a higher PM2.5 could lead to the rise of engine emission especially in UHC and PM2.5 despite at the low thrust setting and high thrust setting,and even couple with 3.2%rise in energy consumption and 1%reduction in combustion efficiency.CO,NO and NO2 in ambient air show less influence on engine performance and emission characteristic than PM2.5.Both types of SAF blend were observed significant reductions in PM2.5 and UHC.PM2.5 reduction obtained 37.9%-99.8%by FT blend and 0.64%-93.9%by HCHJ blend through the whole trust settings.There are almost 6.67%positive benefit in TSFC through the whole thrust setting by 7%FT blend.The effects of air quality and SAF blend on engine emission present significant changes on PM and UHC but the slight change on CO and NOx.By SAF blend,the energy saving and pollutant reduction obtained could be both benefit for air quality improvement in airport and further reduce engine emission as the feedback of less pollutants in ambient air. 展开更多
关键词 Air quality PM UHC AIRPORT SAFs Engine emission
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全场效应管8Ω/190W,4Ω/306W差动输出UHC MOS-FET功率放大器
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作者 从余 《实用影音技术》 2001年第8期61-65,共5页
差动输出放大器由于电路较为复杂,实现起来较为困难.本文所介绍的放大器是一款采用完全对称电路的直流功率放大器,在第二级电压放大级中使用了两级差动电路,构成了差动输出放大器.
关键词 全场效应管 差动输出 UHC MOSFET 功率放大器
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对称三级放大无负反馈UHC MOS—FET 25瓦功率放大器
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作者 从余 《实用电子文摘》 1997年第6期7-11,共5页
事实证明无负反馈功率放大器的失真率同样可以做得很小,如果能将放大器的输出阻抗也做得很小,则音质完全可以赶过负反馈功率放大器。本文介绍一款由六支半导体管构成的音频功率放大器,末级采用UHC MOS—FET,放大器的失真率小于0.1%、阻... 事实证明无负反馈功率放大器的失真率同样可以做得很小,如果能将放大器的输出阻抗也做得很小,则音质完全可以赶过负反馈功率放大器。本文介绍一款由六支半导体管构成的音频功率放大器,末级采用UHC MOS—FET,放大器的失真率小于0.1%、阻尼系数大于20、频带达300kHz、输出功率为25w。 展开更多
关键词 功率放大器 UHC MOS-FET 无负反馈
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UHC MOS—FET甲乙类20W功率放大器
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作者 从余 《实用电子文摘》 1997年第7期7-10,共4页
UHC MOS-FET是一种低电压大电流控制器件,它的Gm非常大。日本的音响设备厂家用它来开发高级音频放大器。发烧友也纷纷用UHC MOS-FET制作自己的功率放大器。UHC MOS-FET对温度的变化较为敏感,用于放大器时其温度系数为正值,温度上升漏极... UHC MOS-FET是一种低电压大电流控制器件,它的Gm非常大。日本的音响设备厂家用它来开发高级音频放大器。发烧友也纷纷用UHC MOS-FET制作自己的功率放大器。UHC MOS-FET对温度的变化较为敏感,用于放大器时其温度系数为正值,温度上升漏极电流将随之增加。 展开更多
关键词 功率放大器 甲乙类 UHC MOS-FET
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玻璃新品集锦
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作者 徐美君 《建筑玻璃与工业玻璃》 2002年第2期32-33,共2页
关键词 玻璃新产品 亲水玻璃镜 UHC玻璃 遮光玻璃 防爆耐火报警玻璃
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