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Search Results: 1 - 10 of 86775 matches for " 张立明 "
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新生儿呼吸窘迫综合征的防治进展
Advantage of Prevention and Treatment in Neonatal Respiratory Distress Syndrome
 [PDF]

张立, 王娜
Asian Case Reports in Pediatrics (ACRP) , 2013, DOI: 10.12677/ACRP.2013.11003
Abstract: 一般认为,新生儿呼吸窘迫综合征(Neonatal respiratory distress syndrome, NRDS)是由于肺表面活性物质缺乏所致,近年研究认为NRDS的发病与胎龄、出生体重、窒息、剖宫产、感染、产前应用肾上腺皮质激素、糖尿病母亲、宫内慢性缺氧等多种因素有关。为了预防NRDS的发生,产前可给产妇应用糖皮质激素、氨溴索等药物,出生后可尽早给予大剂量氨溴索、肺表面活性物质(Pulmonary surfactant, PS)、持续呼吸道正压通气(Continuous positive air-way pressure, CPAP)、高频震荡通气(High-frequency oscillatory ventilation, HFOV)、吸入一氧化氮、液态通气及体外膜肺治疗以阻止病情的进展。
Neonatal respiratory distress syndrome (NRDS) is caused by deficiency of pulmonary surfactant (PS) in premature infants generally. But it is associated with gestational age, birthweight, asphyxia, caesarean birth, infection, use dexamethasone to mother before delivery, diabetic mother and fetus intrauterine hypoxia. Treated with ambroxol and dexamethasone to maternity before delivery may prevent the NRDS. High dose ambroxol, PS, continuous positive air-way pressure, high-frequency oscillatory ventilation, inhaled NO, liquid ventilation and extracorporeal membrane oxygenation may be used earlier to newborns after birth to avoid aggravation of the disease.
兆瓦级垂直轴风力发电机塔架的设计与分析
Design and Analysis of MW H-Type Vertical Axis Wind Turbine Tower
 [PDF]

张立,, 李乐乐
Mechanical Engineering and Technology (MET) , 2014, DOI: 10.12677/MET.2014.31006
Abstract:
针对现有大型垂直轴风力发电机组塔架存在的不足,提出了一种新型兆瓦级H型垂直轴风力发电双三角形式的塔架,计算了塔架所承受的永久载荷和风载。利用Ansys workbench有限元分析软件,对塔架进行了静强度和刚度分析。结果表明,在现有设计参数下,塔架的最大等效应力为7.1 Mpa,塔架的最大变形位于最高处,为0.04 m,强度和刚度均满足要求。
Aiming at the deficiency of existing large vertical axis wind turbine tower, a MW H-type vertical shaft wind power tower with double triangle is designed. The permanent load and wind load of tower structure are calculated. By means of Ansys workbench software, the static strength and rigidity of the tower are also analyzed. Numerical simulation results show that the maximum deformation and the maximum stress of the tower are within the allowable range in the condition of given design parameters.
连铸中间包水口吹氩对堵塞的影响数值模拟
Numerical Simulation of Influence of Argon Flowrate on Tundish Nozzle Clogging during Continuous Casting
 [PDF]

袁方, 王新华, 张炯, 张立
International Journal of Fluid Dynamics (IJFD) , 2014, DOI: 10.12677/IJFD.2014.24009
Abstract:
本文采用数值模拟方法,对水口吹氩量和水口开度影响水口沉积速率的规律作了分析研究。结果表明,吹氩量对水口内的压力存在较大的影响,压力在滑动水口处存在突降。使水口滑板处保持正压的吹氩量随着开度的减小而增大。水口开度从66.45%减小至42.82%时,使水口滑板处保持正压的吹氩量从10 L?min?1增加至25~30 L?min?1。吹氩量对水口内沉积速率的影响规律与滑板开度有关。大开度时,较小吹氩量2.5~5 L?min?1可以使沉积速率降至最低,但随着吹氩量进一步增大时,沉积速率反而增加,至最大值后再次下降。小开度时,随着吹氩量的增加,沉积速率均为下降趋势,但吹氩量大于15~20 L?min?1以后,增大吹氩量对降低沉积速率的效果并不明显。综合考虑吹气量对水口内压力和对沉积速率的影响,大开度下(>60%)合适的吹气量应为10 L?min?1。考虑大吹气量带来的危害,小开度下(<60%)合适的吹气量应为15~20 L?min?1
Influence of argon flowrate and slide gate opening ratio on deposition rate was researched by the method of numerical simulation. Flowrate of argon had influence markedly upon pressure in the nozzle, and the pressure dropped suddenly after molten steel flowing through the slide gate. To keep positive pressure at slide gate for avoiding inspiration of air, minimum flowrate of argon was increased from about 10 L?min?1 to 25~30 L?min?1 as slide gate opening ratio decreasing from 66.45%to 42.82% when casting speed was 1.2 m?min?1. Influence of argon flowrate on the deposition rate of alumina was related to the slide gate opening ratio. When the slide gate opening ratio was big, such as 66.45%, the deposition rate of alumina occurred maximum and minimum values as the argon flowrate increased step by step. When the opening ratio was small, such as 50.46% and 42.82%, the deposition rate of alumina was decreased all along as the argon flowrate increased, and the effect of argon flowrate on decreasing alumina deposition rate was not obvious when the argon flowrate was more than 15~20 L?min?1. Considering the influence of flowrate upon to static pressure in nozzle and deposition rate, the appropriate argon flowrate was 10 L?min?1 as big opening ratio of slide gate (>60%). Due to the disadvantage of high flowrate, the appropriate argon flowrate was 15~20 L?min?1 as small opening ratio (<60%).
正交MFA和不相关MFA*
于耀亮,张立
模式识别与人工智能 , 2008,
Abstract: 近期提出的边际费希尔分析(MFA)取得比传统线性判别分析(LDA)更好的分类效果.本文在MFA可分性准则的基础上,提出在基向量上加正交和不相关的约束.给出求解本文方法的迭代算法,并进一步从理论上证明它们在可分性上比原始的MFA要好.随后,在ORL和Tale人脸库上的实验证明本文方法的有效性.
SLAM问题中的模糊几何地图与顶点自定位法
陈东岳,张立
控制理论与应用 , 2006,
Abstract: 在模糊几何地图的基础上提出了顶点定位法来解决机器人的室内SLAM中的实时自定位问题.顶点定位法是从传感信息中抽取多边形顶点作为路标进行定位.顶点定位法与传统的边匹配定位法比较有计算量小,定位精度高等优点.此外本文提出了基于空间距离的传感数据两次分类方法构建模糊几何地图,提高了数字地图精确度.实验结果表明其性能优于传统的方法.
宁夏与东北短梗五加不同部位黄酮含量比较
雷娇,张立
宁夏医科大学学报 , 2013,
Abstract: 目的比较东北与宁夏短梗五加茎、叶、果实的黄酮含量。方法采用单因素实验和正交实验优选短梗五加茎最佳提取工艺,并对其茎、叶、果实的黄酮含量测定比较。结果提取短梗五加茎中总黄酮的最佳工艺条件为乙醇浓度50%,提取温度为70°C,提取时间为3h,料液比为120。东北短梗五加茎、叶、果实的黄酮含量分别为27.96、71.47、35.67mg?g-1。宁夏短梗五加茎、叶、果实的黄酮含量分别为39、88.51、39.03mg?g-1。结论宁夏短梗五加茎、叶、果实中黄酮含量高于东北短梗五加。
非繁殖期成年雄性布氏田鼠对群体气味的辨别
张立,房继
兽类学报 , 1996,
Abstract: ?本文研究了非繁殖期成年雄性布氏田鼠对陌生群体气味、本群体气味的社会探究行为和尿标记行为,探讨了布氏田鼠利用气味信号进行群体辨别的能力.在对熟悉相的辨别实验中,雄鼠对陌生群体气味的社会探究和尿标记行为明显多于本群体气味和对照组,优势个体的探究和尿标记行为显著高于从属个体。实验结果表明:布氏田鼠具有对群体气味的辨别能力;在巢垫物中存在用于群体识别的化学通讯成分,优势鼠的气味标记可能在种内群体间的嗅觉通讯中起着重要的作用。
妈咪爱治疗新生儿黄疸的临床疗效分析
Clinical Efficiency of Medilac-Vita in Children with Neonatal Jaundice
 [PDF]

张立, 门光国, 马晓媚
Asian Case Reports in Pediatrics (ACRP) , 2013, DOI: 10.12677/ACRP.2013.13011
Abstract: 目的:观察分析妈咪爱在新生儿黄疸治疗中的临床疗效。方法112例新生儿黄疸患儿随机分为治疗组和对照组,每组56例。两组都给予常规治疗治疗组在常规治疗基础上加服妈咪爱,并通过动态检测经皮测胆红素观察其临床疗效。结果:治疗组患儿血清胆红素与对照组比较下降明显(P < 0.01),且治疗组治疗7天后的有效率及治愈率方面明显优于对照组。结论:妈咪爱治疗新生儿黄疸,可迅速降低血清胆红素的水平,优于常规治疗。
 Objective: To observe the clinical efficiency of Medilac-Vita in children with neonatal jaundice. Methods: 112 cases of newborn with neonatal jaundice were randomly divided into treatment group and control group. All were treated with routine therapy. Oral Medilac-Vita was added to the treatment group. Clinical efficiency was observed by detection of transcautaneous bilirubin. Results: The level of transcautaneous bilirubin in treatment group was significantly lower than the control group. After 7 days of treatment, the effective rate and cure rate of the treatment group are obviously better than the control group. Conclusions: Moreover, the effect of Medilac-Vita in treatment of neonatal jaundice is better than routine treatment, it can reduce the serum bilirubin rapidly.


中国页岩气产业的发展现状及趋势
The Development Status and Trends of China Shale Gas Industry
 [PDF]

, 张立, 王旱祥, 李乐乐
Advances in Energy and Power Engineering (AEPE) , 2014, DOI: 10.12677/AEPE.2014.23005
Abstract:

我国页岩气资源丰富、分布广泛,经过十几年的勘探开发,已经取得了实质性的进展,国内页岩气资源开发即将全面铺开。本文主要介绍了我国页岩气资源及其分布、页岩气勘探开发现状,在此基础上,指出了我国页岩气产业的发展趋势。
China’s shale gas resources are rich and widely distributed. After ten years of development, substantial progress has been made, and the development of shale gas industry in Chinawill be in full swing. This paper mainly introduces the distribution of the shale gas, the present development status of shale gas. On this basis, the development trend of shale oil and gas industry in China is pointed out.

带有遗忘的视觉记忆模型及其在注意力选择上的应用*
过晨雷,张立
模式识别与人工智能 , 2008,
Abstract: 在我们以前提出的注意力选择模型上,提出一个带有学习和遗忘的视觉记忆模型:遗忘增量多层分类回归树,来模拟人脑的长短期记忆.同时自监督竞争神经网络综合自下而上和自上而下的信息找到注意力的焦点,该网络各个神经元的连接权根据环境变化在线调整,从而实现整个网络的在线学习.实验证明,该模型能够模拟人的注意力转移,并能在变化的环境中,有意识地盯住感兴趣的物体.
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