oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 72 )

2018 ( 1443 )

2017 ( 1550 )

2016 ( 1633 )

Custom range...

Search Results: 1 - 10 of 74761 matches for " 申京建 "
All listed articles are free for downloading (OA Articles)
Page 1 /74761
Display every page Item
脑益嗪对实验性脑血栓形成及血小板聚集的抑制作用
周以华,,王荣刚,杨秋生,赵淑芬,金有豫
药学学报 , 1988,
Abstract: 本文报道脑益嗪对大鼠实验性脑血栓形成及兔血小板聚集的抑制作用。经大鼠颈动脉顺行注射复合血栓诱导剂造成脑血栓模型,测定伊文思兰通过血脑屏障渗入脑实质的量以反映脑血栓的严重程度。结果表明脑益嗪(67mg/kg,灌胃)有抗脑血栓形成的作用。半体内实验表明脑益嗪(34mg/kg,灌胃)可抑制兔血小板聚集。
基于质心体系稳态振动理论的高速列车蛇形运动研究
Study on the Snake-Like Movement of High-Speed Railway Vehicles Based on Steady-State Vibration Theory of the Center of Mass
 [PDF]

爱国, 翰林,
Open Journal of Transportation Technologies (OJTT) , 2013, DOI: 10.12677/OJTT.2013.21009
Abstract:
本文通过分析车体各个自由度与车体质心横向振动之间的关系,建立了车体质心横向振动分析的简化模型,在此基础上,运用稳定平衡体系的振动条件,证明重力和轨面支撑力是导致车体质心在轨面上发生横向振动的根本原因,并由此推导出车体质心横向振动频率与车轮踏面锥度之间的关系,发现当车轮踏面锥度 ≥ 1/40时,车体质心的横向振动是稳定的。在此基础上,讨论了车体在不同横向振动频率和不同行驶速度情况下的蛇形运动波长以及因蛇形运动而作用于轨道上的横向作用力。而有关横向作用力的计算表明,车体对轨道的横向作用力在车体重量的5%~2%之间,而规范给出的数据敲好处于这个范围内。
By analyzing the relationship between the various degrees of freedom of the body and the car body mass center transverse vibration, the establishment of a simplified model of the vehicle center of mass lateral vibration analysis, and on this basis, the use of the vibration condition of stable equilibrium system to prove that the support of gravity and track surface power is the root cause of the car center of mass in the lateral vibration of rail surface, and thus derive the relationship between the turnout center of mass transverse vibration frequency of the wheel tread taper, found that when the wheel tread taper ≥ 1/40, vehicle physical the lateral vibration of the heart is stable. Based above and combined with different speed and different lateral vibration frequency, the snake-like movement wavelength of the train vehicle was discussed, as the further step, the lateral force induced by snake-like movement and effected on the orbit was discussed deeply, it is found that the value of the force is in the range of 5% to 20% of the vehicle weight, the given specification (10% of the vehicle weight) is just located in this range.
80岁以上急性心肌梗死患者的临床特点
Clinical Characteristics of Patients Older than 80 Years with Acute Myocardial Infarction
 [PDF]

黎娜, 崔超英,
Asian Case Reports in Vascular Medicine (ACRVM) , 2014, DOI: 10.12677/ACRVM.2014.32002
Abstract:
目的:探讨80岁以上急性心肌梗死患者临床和冠脉病变特点。方法:2008年10月至2013年10月中日友好医院收治的急性心肌梗死(AMI)患者中有132例年龄>80岁,其中80例行冠状动脉造影。收集研究对象的临床和冠状动脉造影(CAG)资料,对其进行回顾性分析。结果:132例患者平均年龄83.80 ± 3.57岁,男性86例,女性46例,64例以胸痛为主要症状,68例无典型胸痛表现。最常见的危险因素是高血压(92例)和高脂血症(92例)。急性ST段抬高型心肌梗死(STEMI)80例,下壁心梗受累例数最多(48例),急性非ST段抬高型心肌梗死(NSTEMI)52例。其中的116例患者超声心动(UCG)左室射血分数(LVEF) 52.41% ± 13.81%,包括24例LVEF < 40%。80例行CAG患者中38例梗死相关动脉(IRA)为RCA,44例患者病变血管有6支。死亡20例,最常见的并发症是心律失常(92例)和肾衰竭(50例)。结论:80岁以上AMI患者临床表现多样,NSTEMI比例较年轻人增高,高血压和高脂血症为最常见危险因素,下壁心梗、3只血管病变、IRA为RCA最常见,死亡率高,最常见的并发症是心律失常和肾衰竭。
Aims: We aim to investigate the characteristics of patients older than the age of 80 with acute myocardial infarction (AMI). Methods: This retrospective study included 132 patients older than 80 years with AMI, 80 patients underwent Coronary Angiography (CAG). All patients were admitted and treated in our hospital from Oct. 2008 to Oct. 2013. We evaluated their clinical features and CAG. Results: The mean age was 83.80 ± 3.57 years old, 86 were males and 46 were females. Sixty-four patients presented typical chest pain, 68 patients didn’t present chest pain. Hypertension (92) and hyperlipidmia (92) were the most common risk factors. ST segment elevation infarction (STEMI) was present in 80 patients; the most common infarction area was inferior wall (48). None ST segment elevation infarction (NSTEMI) was present in 52 patients. The mean left ventricule ejection fraction (LVEF) of one hundred and sixteen patients was 52.41% ± 13.81%, especially 24 patients LVEF < 40%. Eighty patients underwent coronary angiography, right coronary artery (RCA) was the most frequent Infarct-Related Artery (IRA) (38). Forty-four patients had three vessels disease. Twenty patients died; the most common complications were arrithymia (92) and renal failure (50). Conclusions: The clinic manifestations of patients older than 80 years with AMI were various. NSTEMI ratio was relatively high comparing with younger. Hypertension and hyperlipidemia were the most common risk factors. The most frequent situations were inferior wall MI, three vessels disease, and RCA being the IRA. Mortality was high, and the most common complications were arrithymia and renal failure.
北京0~14岁社区儿童哮喘患病率及相关症状分析
向莉,昆玲,,韩琤琤,张跃红,簿新生,孙培军,
中国公共卫生 , 2011, DOI: 10.11847/zgggws2011-27-06-01
Abstract: ?目的了解北京市西城区0~14岁社区儿童哮喘患病率及其哮喘相关症状的临床分布特点,为进一步研究城市社区儿童哮喘预防与控制适宜技术提供依据.方法于2009年1-6月采取分层整群抽样方法,对北京市西城区所属的德胜社区和西长安街社区共3886名0~14岁儿童进行问卷调查.结果北京市西城社区0~14岁儿童中,112例儿童曾经被医生诊断为哮喘,患病率为2.88%,>5%的儿童表现有运动和/或夜间喘息咳嗽症状,>4%的儿童近1年内至少患6次呼吸道感染,曾诊断鼻炎和湿疹的儿童分别为11%和21%.结论北京城市儿童哮喘患病率在近20年间呈现增加趋势,托幼儿童是哮喘新发病例的主要人群,近1年内现患哮喘相关症状的城市社区儿童可能高于经临床就诊和诊断的儿童.
絮凝与生物强化组合技术处理油田含聚污水
颜珩烨,张忠智,代吉,张敏,,唐雪冰,,赵立平
环境工程学报 , 2014,
Abstract: 针对河南油田采油污水,室内选择4种常用无机絮凝剂与阳离子聚丙烯酰胺(CPAM)复配,筛选出最佳的絮凝剂用量:聚合氯化铝(PAC)用量为300mg/L,CPAM用量为10mg/L。研究了投加HPAM降解菌对油田含聚污水中COD的去除效果,优选出2株以聚合物(HPAM)为唯一碳源的降解菌,通过分子生物学16SrDNA鉴定,XL-1和XL-2菌分别为苏云金芽孢杆菌和溶血不动杆菌。实验结果表明,在温度为30℃,pH为7.5,降解72h的条件下,XL-1菌的B/C增大了0.11,COD去除率提高了11.03%;XL-2菌的B/C增大了0.07,COD去除率提高了6.3%。油田污水经絮凝-生物强化组合工艺处理后,出水COD平均值为77.1mg/L,总去除率为73.2%,絮凝段和生化段工艺的COD去除率分别为54.1%和19.1%,达到《污水综合排放标准(GB/T8978-1996)》排放标准。
一种光电混合型专家系统专用机OEHCES
, 铉国
自动化学报 , 1993,
Abstract:
A Stud on Amplified Fragment Length Polymorphism at Locus D17S30 in Han Nationality of Yunnan Province
云南汉族人群D17S30位点扩增片段长度多态性A Stud on Amplified Fragment Length Polymorphism at Locus D17S30 in Han Nationality of Yunnan Province

欧炯文,邹浪萍,,,韩晓华,赵永和OU Jiong-Wen,ZOU Lang-Ping,LI Jiang-Jing,SHEN Bin,HAN Xiao-Hua,ZHAO Yong-He
遗传 , 1997,
Abstract: A study on amplified fragment length polymorphism (Amp-FLP) at locus D17S30 in Han nationality of Yunnan was carried out by using PCR followed by a high-resolution PAGE technique and silver staining. In a sample of 105 unrelated individuals, a total 12 different alleles and 41 genotypes were detected. The heterozygosity was 83.81% and the probability of discrimination(DP) was 0.9647. The distribution of observed genotypes obeyed the Hardy-Weinberg equilibrium.
南斯拉夫《社会监督价格制度法》评述

中外法学 , 1989,
Abstract:
工业检测图像灰度波动变换自适应阈值分割算法
魏巍, , 千庆姬
自动化学报 , 2011, DOI: 10.3724/SP.J.1004.2011.00944
Abstract: ?工业检测图像经常受到不均光照的影响,对该类图像局部自适应分割算法比全局算法能产生更好的分割效果.但局部算法中基于分块的算法对分块方法缺乏指导,而基于邻域的算法容易在背景或前景内部产生误分.针对上述缺点,本文提出了一种多方向灰度波动变换的自适应阈值分割算法.该算法先从多个方向依照灰度波动对图像进行转换,构造以多维向量为基础的灰度波动变换矩阵,然后利用主成分分析法(Principalcomponentanalysis,PCA)将高维向量压缩至一维并生成变换图像,最后运用Otsu算法分割变换图像.该算法无需分块,并且仅需波动幅度阈值和布尔型背景色两个参数.实验结果表明,该算法能够有效减少不均光照对工业检测图像分割的影响,与Niblack法、Sauvola法等几种局部算法相比,该法在分割效果上具有了明显的提升.
[Fe(CNCH_2Ph)_6]Br_2的氧原子转移反应及其产物研究

科学通报 , 1993,
Abstract: 过渡金属异腈配合物的性质与金属羰基化合物的性质十分相似。异腈分子与金属原子配位引起CNR基C原子上电子云密度减,由此提高了醇或胺所发动的亲核加成反应的活泼性。因此关于异腈配合物的研究将会对新型配合物的制备开辟新的途径。事实上醇或胺对异腈的加成已经广泛应用于金属卡宾化合物的合成中。
Page 1 /74761
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.