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Search Results: 1 - 10 of 19610 matches for " 福井胜则 "
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强度破坏点后岩石应力–应变曲线荷载速率依存性研究
雷 鸣,羽柴公博,福井,大久保诚介
岩石力学与工程学报 , 2010,
Abstract: 利用3种试验方法对在强度破坏点之后处于低应力下的岩石应力–应变曲线的荷载速率依存性进行研究。首先,对三城目安山岩、稻田花岗岩和田下凝灰岩进行交替变换荷载速率试验,按一定应变间隔De,对同一个试样交替施加高低2种不同的荷载速率,得到对应于2种荷载速率的应力–应变曲线。试验结果表明,在破坏点之后仍可以清楚地观察到应力–应变曲线的荷载速率依存性。其次,对三城目安山岩和稻田花岗岩在恒定速率下进行循环加载卸载试验,得到了应力–应变曲线上很多点处的卸载曲线。将在交替变换荷载速率试验中得到的对应于低荷载速率的应力–应变曲线沿着卸载曲线平移,可以与高荷载速率对应的应力–应变曲线重合。最后,对三城目安山岩、稻田花岗岩和田下凝灰岩进行组合试验,即对一个岩石试样施加2种交替变换荷载速率和循环加载卸载。结果表明组合试验具有操作简单性和很强的适应性,可以用来研究岩石强度破坏点处以及强度破坏点之后领域的荷载速率依存性,强度破坏点之后的应力变化率与强度点处的基本一致。
STUDY ON THE DETRITUS FROM DIFFERENT EXCAVATION MACHINES AND METHODS
关于掘进机械破碎岩片的研究

ChenWenli,Fukui Katsunori,Okubo Seisuke,
陈文莉
,福井,大久保诚介

岩石力学与工程学报 , 2003,
Abstract: The particle size distribution of detritus sampled from different excavation machines and methods is calculated and analyzed. The comparison of the results shows that the particle size distribution of detritus follows the same mathematical model and is of similar trends.
VISCOELASTIC PROPERTIES AND A MECHANICAL MODEL FOR POROUS ROCKS UNDER AIR-DRIED AND WATER-SATURATED CONDITIONS
气干与湿润状态下多孔隙岩石的黏弹性特性与力学模型

GAO Xiujun,Okubo Seisuke,Fukui Katsunori,
高秀君
,大久保诚介,福井

岩石力学与工程学报 , 2007,
Abstract: 为研究多孔隙岩石的变形特性,提出一个适用于多孔隙岩石的非线形流变模型(本构方程).本模型是由弹簧与阻尼器串连组成,弹簧部分采用作者曾经提出的本构方程;代表黏性部分的阻尼器设定加载前黏度很小,随着荷载的增加而逐渐加大.在低应力水平下的蠕变试验中,由于弹性系数没有明显的下降,因而设定阻尼器的应变与蠕变应变相同.为验证模型的准确性,对泥质砂岩、大谷凝灰岩、田下凝灰岩与河津凝灰岩4类岩石分别进行理论计算与试验测试.对于各类岩石,计算得到的应力-应变曲线与实测曲线基本一致,而且用此流变模型,发现气干与湿润状态下杨氏模量具有明显的差异.研究结果表明,在这2种状态下,杨氏模量的差异是由于非弹性应变(即阻尼器的应变)不同而引起的.在湿润状态下,阻尼器的应变增加越大,杨氏模量则变得越小.即使在较低的应力条件下,阻尼器的应变比以往研究中所认为的应变要大很多.
DEVELOPMENT AND APPLICATION OF TRIAXIAL COMPRESSION TESTS WITH SMALL SPECIMENS
适用于小型岩石试件的三轴压缩试验技术与设备的开发及其应用

GAO Xiujun,Hashiba Kimihiro,Okubo Seisuke,Fukui Katsunori,
高秀君
,羽柴公博,大久保诚介,福井

岩石力学与工程学报 , 2006,
Abstract: It is well known that rock properties often vary from site to site,and even from specimen to specimen.Soi,n many casesi,t requires many rock samples,much effort and cost to obtain the reliable data.In order to make more rock samples to carry out rock mechanical strength tests in the laboratory,a testing method with a small rock specimen(10 mm in diameter and 20 mm in length) was proposed and developed.In the triaxial compression test,the transparent triaxial vessel made of an acrylic acid resin,developed by Okubo et al.,was modified and used for the small specimen.The transparent vessel was designed for triaxial compression test under confining pressure up to 10 MPa.It was found that the mechanical parameters,cohesion and angle of internal friction,of Tage tuff with small specimens are very similar to the results obtained from regular specimen.Furthermore,the loading rate dependency of a stress-strain curve was also obtained by just one small specimen with the loading rate alternately switching during a test.The rock collected from landslide area near the Three Gorges Reservoir was also examined.By the proposed methodt,he strength characteristic curve and the loading rate dependency of the sample rock were accurately and economically obtained.
底部排气弹的底阻计算方法
刘亚飞,
兵工学报 , 1992,
Abstract: ?给出一种以固体燃料底排减阻特性为基础的底排弹底阻工程估算方法。计算结果与靶场射击实验数据符合良好。
基于片上多核的频繁项集并行挖掘算法
张步忠?,程玉,林?
计算机科学 , 2014,
Abstract: 关联规则挖掘中最主要的工作是如何高效地挖掘频繁项集。目前在单机平台上,由于计算量大等原因,大数据集上的关联规则挖掘很难得到理想结果。在分析现有频繁项集挖掘算法的基础上,结合eclat和declat挖掘算法优点,针对大数据集和片上多核共享内存计算环境,提出一种高效的并行频繁项集挖掘算法peclat,算法实现了任务级并行挖掘频繁项集,并在大数据集上进行了多项测试。实验结果表明,无论数据稠密程度如何,该算法均能取得较好的性能。
复合增程弹头部喷流气动特性实验研究
谭献忠,,陈少松,徐琴
弹道学报 , 2013,
Abstract: 通过风洞实验研究了头部喷流喷咀布局形式及喷流压力比对复合增程弹气动特性的影响。实验马赫数为2.0、2.5和3.0,迎角为0~6°,喷流压力比为0~180,喷流介质为冷空气,喷咀布局形式包括3种不同的喷咀倾角和4种不同的喷咀数量。实验结果表明,喷流后复合增程弹阻力系数下降(个别工况除外),升力系数增加,压心明显后移;喷咀倾角及喷咀数量增加,复合增程弹阻力系数均下降,喷咀倾角为30°、喷咀数量为4个时升力系数增加幅度最大、压心后移量最大,而其他喷咀倾角和喷咀数量时升力系数和压心的影响均基本相同;随着喷流压力比增加,复合增程弹阻力系数下降,而升力系数和压心变化不明显。
探讨顾客知觉价值之产品及交易知觉价值
Customers’ Perceived Value Focusing on the Customers’ Perceived Product Value and Transaction Value
 [PDF]

林育
Service Science and Management (SSEM) , 2014, DOI: 10.12677/SSEM.2014.34006
Abstract: 消费者在购买商品的过程中总是喜欢“杀价”,过去关于消费者议价方面的研究,多半着重在消费者杀价对商家的影响,少有研究者剖析消费者杀价的心理机制。本研究针对30位受访者以一对一深度访谈的方式,彻底探查消费者议价过程中,与“产品本身”和“交易情境”相关的“具体事实”,并检测这些具体事件与“展望理论”之关联性。研究结果显示消费者对于无形服务的“知觉获得价值”与“知觉交易价值”,也会像有形的金钱一般能够符合“展望理论”价值函数的特性。
Consumers always like to bargain with salespeople when they are shopping. Past researches about “bargaining” concern the influence on transaction and neglect consumers’ perception. In this study, 30 consumers are interviewed, and researcher observes their attitude and behavior when they bargain with salespeople. This study investigates the “events” consumers bargain with salespeople specially focused on “product” or “transaction.” The relationship between these events and Prospect theory is examined. The results show that the “perceived acquisition value” and “perceived transaction value” of service provided by salespeople also can fit the features of value function in Prospect theory.
固体燃料底排燃烧的风洞模拟
刘亚飞,,罗荣,陈少松,曹顶贵,刘京荣
力学与实践 , 1997, DOI: 10.6052/1000-0992-1997-060
Abstract: 本文根据KorstH.H.的跨超音速底压限制理论,导出底排燃烧的风洞实验相似参数,并介绍以气体燃料为底排介质的模拟实验技术
滑溜水压裂液与页岩储层化学反应及其对孔隙结构的影响
Chemical reactions and effects of slick water fracturing fluid on the pore structures of shale reservoirs in different deposition environments

,王永莉,吴保祥,广,魏志福,汪亘,徐亮
- , 2018, DOI: 10.7523/j.issn.2095-6134.2018.05.019
Abstract: 摘要 为探究页岩气井压裂作业过程中,滑溜水压裂液对不同沉积环境(海相、陆相、海陆过渡相)页岩储层孔隙结构的影响,利用盆地深层流体-岩石相互作用模拟仪,模拟地层条件(100 ℃,50 MPa)下滑溜水压裂液注入过程中与不同沉积环境页岩的相互作用实验。通过对比反应前与反应72 h后3套页岩样品矿物组成、孔体积和比表面积的变化,对不同类型页岩孔隙结构的变化进行剖析。结果表明,滑溜水压裂液处理后的不同沉积环境页岩矿物组成和孔隙结构都发生了变化。海相页岩反应之后,碳酸盐矿物发生溶蚀,形成大量直径为2~8 μm左右的溶蚀孔,导致纳米孔孔体积和比表面积减小。因含有较多的伊/蒙混层矿物,陆相和海陆过渡相页岩遇压裂液容易发生膨胀、分散作用,导致其孔体积及比表面积减小。该实验结果为研究滑溜水压裂液对不同沉积环境页岩储层的物理、化学作用,以及为压裂液的改造提供了一定的科学依据。
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