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Search Results: 1 - 10 of 219178 matches for " 刘煜洲 "
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扭转波应用于低应变动力测桩的理论研究
东甲,,王杰英
岩石工程学报 , 2003,
Abstract: 给出层状土中多缺陷桩在桩顶冲击扭矩作用下桩顶扭转响应的解。考虑了桩土相互作用。应用laplace变换和传递矩阵,解桩的满足初始条件和边界条件的一组偏微分方程,导出桩土系统的传递函数,得到桩顶某点扭转振动速度的频率响应函数和频率域表达式。该点扭转振动速度时程由快速fourier逆变换计算。用这种解研究桩的扭转波特征,其结论对应用扭转波进行低应变动力测桩有指导意义
二次受力对粘贴钢板加固梁承载力的影响
来君,,张艳,高洪
长安大学学报(自然科学版) , 2011,
Abstract: 考虑到现行《公路桥梁加固设计规范》中粘贴钢板加固钢筋混凝土梁承载力计算公式的不足,应用弹性力学理论通过对正截面受弯承载力等计算公式进行理论推导,分析了二次受力对加固效果的影响。研究结果表明考虑二次受力影响,钢筋混凝土梁粘贴钢板加固后极限承载力理论计算公式与不考虑二次受力有一定差异;在适筋梁破坏下,随第一次受力情况,二次受力对界限受压区高度有不同的影响;依据受拉区所需最大粘贴钢板量计算公式,可以避免加固后梁出现超筋脆性破坏。
纤维喉镜经口腔诊治下咽部异物的临床体会
Fiber Laryngoscope in Oral and Pharyngeal Foreign Body under the Clinical Experience of
 [PDF]


Asian Case Reports in Otolaryngology (ACRO) , 2013, DOI: 10.12677/ACRO.2013.12004
Abstract:

目的:探讨电视监视纤维喉镜下经口腔诊治下咽部异物的临床应用。方法:分析应用纤维喉镜经口腔诊治下咽部异物所得的197例临床资料。结果:187例患者均顺利取出,成功率94.92%;4例患者未见异物;3例患者因咽反射敏感而拒绝治疗,3例咽侧壁破裂渗血。结论:对纤维喉镜下经口腔诊治下咽部异物临床体会是首先是增加了一种诊治途径,其次是安全准确,并发症少,值得临床推广应用。
To investigate the effect of television watching fiber laryngoscope by the clinical application of oral treatment of pharyngeal foreign body. Methods: The clinical data of 197 cases of application of fiber laryngoscope in oral treatment of pharyngeal foreign body income analysis. Results: 187 patients were successfully removed, the success rate was 94.92%; 4 patients had no foreign body; 3 patients with pharyngeal reflex sensitivity and refuse treat-ment, 3 cases of lateral pharyngeal wall rupture bleeding. Conclusion: The experience of fiber laryngoscope oral treat-ment of throat clinical is first adds a treatment approach, second is safe and accurate, less complications, is worthy of clinical application

纤维鼻咽镜下活检在诊断鼻咽癌中的价值
Fiber Nasopharyngeal Microscopic Biopsy in the Diagnosis of Nasopharyngeal Carcinoma in Value
 [PDF]


Asian Case Reports in Otolaryngology (ACRO) , 2013, DOI: 10.12677/ACRO.2013.13007
Abstract:

目的:探讨电视监视纤维鼻咽镜下行鼻咽部肿物活检术中的应用价值。方法:回顾分析我院应用纤维鼻咽镜直视下行鼻咽部活检所得的38例临床资料。结果:在38例患者中一次成功活检36例,成功率94.7%。结论:纤维鼻咽镜直视下行鼻咽部活检临床体会是定位准确、取材合理、并发症少,对NPC早期诊断,合理治疗,减少误诊和漏诊的发生有重要意义,值得临床推广应用。
 Objective: To investigate the application value of television surveillance endoscopy nasal pharyngeal tumor biopsy. Methods: The clinical data of 38 cases in our hospital were analyzed using fibre nasopharyngoscope straight down from nasopharyngeal biopsy. Results: Of the 38 patients, 36 cases are successful biopsies at the first time. The success rate is 94.7%. Conclusion: Nasopharygo fiberscope straight down from nasopharyngeal biopsy in clinical experience is accurate positioning, reasonable materials and fewer complications. It has the important significance for early diagnosis of NPC, reasonable treatment and the reduction of the occurrence of misdiagnosis and missed diagnosis. And, it is worthy of clinical application.

STUDY OF PEAK-PEAK PRECISION INVERSION FOR REFLECTED WAVE TESTING CURVES OF SINGLE DEFECT PILES
单缺陷桩反射波法动测曲线峰-峰点反演的精度研究

Liu Dongjia,Liu Yuzhou,Wang Jieying,
东甲
,,王杰英

岩石力学与工程学报 , 2003,
Abstract: Based on theoretical calculation,physical interpretation and practical testing data,the precision of inversion of shaft defect locations by peak-peak reflected wave testing curves for single piles is studied. The results indicate that the precision mainly depends on the ratio of the defect length to the critical defect length defined in this paper when the wave velocity in the piles is accurate. If the ratio is more than or equal to 1,the inversion defect locations are close to the true ones. If the ratio is less than 1,the inversion depth of the upper defect surface is shallower,while that of the lower defect surface is deeper. The inversion defect length for piles with short defect becomes larger than real one because of the superimposition of upward tensile wave reflected by the upper surface and upward compressive wave reflected by the lower surface,and this is verified by practical testing data.
基于遥感的南四湖湿地干旱响应特征研究
于泉,,梁春玲,周蕾,张祖陆,王永生
资源科学 , 2014,
Abstract: 根据多年的气象资料和PDSI(PalmerDroughtSeverityIndex)指数数据以及干旱年份(2002年)的水文资料,分析了南四湖区域气候变化的特征和干旱背景,并利用干旱年份的5景Landsat卫星遥感数据,计算了研究区的归一化植被指数(NDVI)和修正的归一化水体指数(MNDWI),并作为湿地对干旱响应的特征指标,研究了2002年南四湖湿地干旱特征,揭示了湿地对于极端干旱事件的响应特征,着重分析了干旱对湖泊湿地植被的影响,并讨论了极端干旱对于湖泊湿地生态系统和景观格局变化的影响。得到以下结论:①近60多年来南四湖湿地增温趋势明显(R2=0.21,P=0.0002),干旱趋势不显著。2002年是南四湖湿地自1951年以来降水最少年份,也是严重干旱年份(PDSI<-3);②干旱导致湿地水面持续减小,湿地植被NDVI和植被面积存在先升高后降低特征。在受到轻微干旱时,湿地植被NDVI略有增加;当发生中度和严重干旱时,湿地植被NDVI急剧下降,且小于多年平均值;③从空间格局看,2002年10月份南四湖中的南阳湖、独山湖和昭阳湖干涸见底。湿地干旱初期,随着水位下降植被向湖心扩展,湿地NDVI上升;而后随着湖盆出露和干旱加剧,植被开始由湖周边向湖心不断死亡,NDVI下降;④极端干旱事件对湿地生态系统和景观格局有显著影响。因此,进行景观格局年际变化分析时需要格外重视干旱等极端气候事件短时间内对湿地景观格局的影响。
昼夜增温对南四湖湿地植被ndvi的影响差异
梁春玲,于泉,,张祖陆
热带地理 , 2015,
Abstract: ?利用近40a的landsat系列卫星的mss、tm和etm+遥感数据,计算了南四湖湿地植被平均归一化植被指数(ndvi),并以此为湿地植被活动的指标,结合南四湖流域内气象站点的逐年、逐月及逐日气温数据,揭示昼夜温度变化对湿地植被活动的影响差异。结果表明:1)近40a来研究区日最高温(tmax)、夜间最低温(tmin)和日均温(tave)都存在显著的上升趋势;其中tmax与tmin增温具有不对称性,r2值分别为0.13和0.26,平均每10a分别增温0.174℃和0.235℃,tmin的增温趋势更明显。2)在人为活动影响较弱的时段(1973―1999年),偏相关分析显示,去除tmin影响,tmax与ndvi呈现极显著的偏相关关系(r=0.412,p=0.008);去除tmax的影响,tmin与ndvi的偏相关关系在任何时期内均不显著。这可能与湿地充足的水份条件以及昼夜增温对湿地植被的生态效应不同有关。
夏季华北地区二次气溶胶的模拟研究

中国科学 地球科学 中国科学 地球科学 , 2005,
Abstract: ?通过模式结果与观测的NOx,CO,O3,NH3,HNO3,SO2和PM2.5的对比,说明CMAQ空气质量模式能够较好地模拟华北地区污染物的变化.同时,模式结果表明河北、河南和山东地区NH3的浓度较高,平均浓度为(30~35)×10?9.模拟试验的结果表明高浓度的NH3使得二次气溶胶中硫酸盐气溶胶生成效率提高了大约30%以上,特别是在邯郸、安阳和长治交界地区其作用更显著,达到了50%.而且,NH3还会增加二次气溶胶中含氮气溶胶和铵盐成分,二者的质量浓度和与硫酸盐气溶胶相当.北京地区边界层高度在白天较高,中午平均高度为1500m.这使得SO2,NH3和HNO3可以输送到边界层上部850hPa.硫酸盐、铵盐和硝酸盐分别在边界层上部和下部形成各自的高浓度区.由于PM2.5的寿命较长,因此它们可以被输送到对流层的中层,形成深厚的气溶胶层,构成了北京地区气溶胶的穹隆.模式结果表明:如要控制华北地区夏季大气中气溶胶的浓度,除了减少SO2和NOx的排放以及一次气溶胶的排放外,降低大气中NH3的排放也是有效办法之一.
基于动态多子族群自适应群居蜘蛛优化算法
An Adaptation Social Spider Optimization Algorithm Based on Dynamic Multi-swarm Strategy

,李彬
- , 2017,
Abstract: 为了提高群居蜘蛛优化算法(SSO)样本多样性和算法收敛性能,提出了一种基于动态多子族群自适应群居蜘蛛优化算法(DMASSO)。根据算法样本多样性和算法进化程度,动态的将蜘蛛种群分成若干个主导子族群和辅助子族群,在不同子族群中分别引入自适应学习因子和高斯扰动因子改进算法个体更新方式,实现提高算法全局寻优能力和保持群体样本多样性。针对具有典型特点的测试函数仿真结果表明,较SSO算法、MSFLA算法等优化算法相比,新算法在收敛速度和收敛精度上均有明显改善。
In order to improve the samples diversity and convergence properties of social spiders optimization algorithm (SSO), an adaptation social spider optimization algorithm based on dynamic multi-swarm strategy (DMASSO) is proposed. According to the algorithm samples diversity and evolutionary level, the spider population is dynamically divided into different sizes leading groups and supporting groups, and the adaptive learning factor and Gaussian disturbance factor are introduced to improve the algorithm update ways, which helps to improve the algorithm global optimization ability and maintain the diversity of the sample population. For the test results of typical characteristics functions show that compared to SSO algorithm, SFLA algorithm and other optimization algorithms, the new algorithm has better convergence speed and convergence accuracy
随机模拟地震反演技术在水平井井位设计中的应用
Stochastic Simulation of Seismic Inversion Technology in the Design of Horizontal Wells Application
 [PDF]

转玲, 赵洪
Advances in Geosciences (AG) , 2012, DOI: 10.12677/AG.2012.23023
Abstract: 随机模拟地震反演技术是储层预测中一项比较实用的技术,该技术算法稳定、可靠、精确,在储层描述方面有较强的优势,尤其对构造及储层复杂地区的预测效果更加明显。大庆长垣东部Z201地区扶余油层储层物性差,横向上属于典型的砂泥岩薄互层,平面迭加连片,油水和岩性分布复杂,地震预测难,本文运用该项技术进行储层预测和精细描述,预测效果与钻井数据吻合度较高,与区域沉积特征吻合,为该区的水平井井位设计提供了可靠的依据。
Stochastic modeling of seismic inversion in reservoir prediction technology is a more practical technology, which algorithm is stable, reliable, accurate, description of the reservoir has a strong advantage, especially in complex areas of construction and reservoir prediction was more obvious. Of Daqing area in eastern Z201 poor reservoir properties of Fuyu oil layer, typical laterally interbedded shale, thin, flat lace overlay, complex distribution of water and lithology, seismic prediction is difficult, the use of the technology for this reservoir prediction and fine description, prediction results and drilling material coincide degrees higher, consistent with the regional sedimentary characteristics, the area of the horizontal wells provide a reliable basis for design.
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