oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 289 )

2018 ( 7215 )

2017 ( 7402 )

2016 ( 7935 )

Custom range...

Search Results: 1 - 10 of 326276 matches for " 王祥 "
All listed articles are free for downloading (OA Articles)
Page 1 /326276
Display every page Item
花园水库大坝防渗加固
Reinforcement Impervious Project for Garden Reservoir Dam
 [PDF]

, 文德续
Hans Journal of Civil Engineering (HJCE) , 2013, DOI: 10.12677/HJCE.2013.24035
Abstract:
沉蕲春花园水库为粘土心墙砂壳坝,1956年运行以来一直存在渗漏等隐患,由于年久失修,不符合现行安全规范,需要进行加固补强处理。进行原因分析并实施了相应的技术方案之后,该坝的整体加固效果显著。重点介绍了灌浆部分工作,其加固技术方案为今后同类型工程积累了宝贵的经验。
The dam of Qichun Garden Reservoir is a shell sand dam with clay core wall. Since the operation in 1956, leakage and other hazards have existed. Having been in bad repair for long years, it doesn’t meet current safety standards and needs reinforcement processing. After the analysis of causes and the implementation of the relevant technical scheme, the integrated function of the dam has been improved significantly. Focusing on the work of grouting, the technical scheme of reinforcement accumulates valuable experience for the similar projects in the future.
基于Android的校园客户端的设计与实现
Design and Implementation of Campus Client Based on Android
 [PDF]

, 吴小
Computer Science and Application (CSA) , 2013, DOI: 10.12677/CSA.2013.37055
Abstract:
当前各高校都提供统一的账号和密码登陆学校的各种系统,包括学校新闻、图书馆系统、教务系统和校园一卡通系统等。这些系统一般都分散在不同的子系统中。本文设计和实现了基Android操作系统的校园客户端系统,该系统集成上述各个系统,方便校园师生访问校园信息。本系统使用解析html文本格式数据的HtmlParser.jar工具包、解析类SAXParserJSONObject。经测试系统在Android 2.3及以上版本运行良好。
>Currently the teachers and students can visit the news system, library system, educational administration system and campus card system by username and password. These systems are generally distributed in different subsystems. This paper designs and implements the campus client system based on the Android operating system, which integrates the various systems to facilitate teachers and students to access campus information. The system uses HtmlParser.jar, SAXParser and JSONObject to parse html text format data. The system runs well under Android 2.3 and above system.
插值运算在SAR成像处理中的应用
The Application of Interpolation Algorithm in SAR Image Processing
 [PDF]

顾久,
Journal of Aerospace Science and Technology (JAST) , 2014, DOI: 10.12677/JAST.2014.21001
Abstract:

在SAR的回波数据的成像处理中,距离徙动校正是影响二维压缩成像聚焦效果的重要因素。本文以正侧视SAR成像为例,研究了2种插值算法:最近邻域近似法、sinc插值法在RD算法成像中的应用。通过计算机仿真,分析比较了2种插值方法的运算量和校正弯曲的效果结果,并在Matlab环境下利用插值算法进行了实际Radarsat-1的卫星数据成像处理。结果表明如果对精度要求低可选用运算量较小的最近邻域插值,对精度要求高时可以选用插值点较多的sinc插值。
In the processing of SAR echo data imaging, RCMC is an important factor which affects the focusing effect of two-dimensional image compression. In this paper, we take the positive side of SAR imaging for example, and research the application of the nearest neighbor approximation and sinc interpolation algorithm in RD imaging. By computer simulation, we analyze and compare the computation and bending effects of the two interpolation methods, and apply them in the imaging process of Radarsat-1 satellite in Matlab environment. The results show that the nearest neighbor approximation is suitable for low precision requirements with the benefits of small computation, and sinc interpolation algorithm is more suitable for high accuracy requirements with more in- terpolation points.

从科学纲领研究方法来看“杠杆”教学
The Study of Lever Teaching by Science Program Research Methods
 [PDF]

,
Creative Education Studies (CES) , 2015, DOI: 10.12677/CES.2015.34028
Abstract:
拉卡托斯认为科学认识是一个动态发展的过程,任何科学理论都是由硬核和保护带构成,科学纲领的发展和调整遵循反面启发法和正面启发法两种方法论原则。本文从拉卡托斯科学研究纲领方法论的视角,探讨小学科学教材中“杠杆”教学的合理性和科学性,以期对拉卡托斯的科学研究纲领方法论有更深层次的理解,同时对科学教育者的教学有一定的启示作用。
Lakatos believes that scientific knowledge is a dynamic process of development, and any scientific theory is composed of a hard core and a protective belt, and the development and adjustment programs of scientific programme follow these two methodological principles about negative heuristics and positive heuristics. This study is to discuss primary science textbooks and scientific and reasonable “lever” of teaching based on the perspective of the science program research methods from Lakatos, which is intended to have a deeper understanding of his theory and give a certain inspiration to these science teachers.
农药氟虫腈与生态保护的研究进展
Study on Fipronil in the Ecological Protection
 [PDF]

,,
Hans Journal of Agricultural Sciences (HJAS) , 2014, DOI: 10.12677/HJAS.2014.45015
Abstract:
本文综述了农药氟虫腈在环境中的应用,并结合国内外在农药降解领域的研究,对氟虫腈及其代谢产物在环境中的降解行为、氟虫腈的作用机制及其毒理学研究进展进行论述。氟虫腈在水体中以光解和水解为主,在土壤中除了光解和水解作用,还存在氧化作用。研究表明,氟虫腈及其代谢产物对非标靶类动物(蜜蜂、淡水脊椎动物、鸟类等)具有毒性,但对人类的健康影响还有待进一步研究。
This paper summarizes the fipronil application in the environment. Based on recent pesticide de-gradation research, the degradation behavior of fipronil and its metabolites in environment were discussed, and the toxicology mechanism was stated. Fipronil is given priority to photolysis and hydrolysis in water. There exist photolysis, hydrolysis and oxidation in soil. Research shows that fipronil and its metabolites to non-target species (bees, freshwater vertebrate animals, birds, etc.) are poisonous. But the impact on human health needs further research.
流体包裹体微量元素在油气勘探中的应用——以塔里木盆地塔中地区为例
,
沉积学报 , 2011,
Abstract: 采用电感耦合等离子体质谱(ICP-MS)测试分析技术,对塔中地区10口井16个志留系沥青砂岩包裹体微量元素进行了分析,探讨了包裹体微量元素分布特征及变化规律,并深入分析了其所指示的地质意义。结果表明,所测得的微量元素丰度差异明显,同一井区内或不同井区之间,各井主要的微量元素分布规律表现出从构造低部位向构造高部位方向,微量元素丰度总体上呈增大的趋势。较低的V/Ni比值和较高的Fe含量指示一种强还原的沉积环境;单个微量元素与微量元素组的变化规律表现出较好的一致性,反映出塔中志留系油气向构造高位置或地层尖灭方向的运移,在平面上从西北向东南方向运移。因此,包裹体微量元素在研究油气运移方向时可以提供有效的依据。
粉喷桩在深厚软基处理中的试验研究

岩石工程学报 , 2001,
Abstract: 1 前  言采用粉喷桩(dryjetmixingpile)加固桩端可达硬层的软基,其效果已得到公认,但对于深厚软土路基采用悬浮粉喷桩加固处理,其效果及变化规律如何,以往研究得不多。本文对粉喷桩加固处理广珠准高速铁路试验段深厚软土路基的实测结果作了分析,供参考。2 工程概况由文献[1]知,广(州)珠(海)准高速铁路穿越广泛沉积第四系松软地层的珠江三角洲平原地带,全线软土路基长达50.3km。试验路段位于dk122+366.02~+690的直线地段,长323.98m,路基面宽12m,设计路堤高约6.4m(含预压土高1.4m)。试验工作于199
喷桩处理高速铁路软基施工研究

铁道工程学报 , 2009,
Abstract: ?研究目的:通过现场试验及水泥土室内试验,研究粉喷桩处理高速铁路软土地基的施工工艺,施工组织和管理。研究结论:采用粉喷桩处理高速铁路软土地基是可行的。不同粉喷桩机型的成桩强度相差不大,相同机械型号不同机组的成桩强度存在较大的差异。10m复搅、全程复搅、增加复搅次数及不同地层对桩体无侧限抗压强度影响不大。在进行粉喷桩施工时,选择施工队伍比选择机型更重要。粉喷桩桩长在10m以内时,桩体无侧限抗压强度比较均匀,施工质量可控性较高。为了保证施工质量,粉喷桩的施工需要严格管理。
高速铁路软土地基的差异沉降试验研究

铁道工程学报 , 2015,
Abstract: ?研究目的:在软土地基上修建高速铁路时,由于其差异沉降要求非常严格,目前常用的软土地基处理方法能否满足要求是高速铁路建设必须面临的重大课题。本文通过采用粉喷桩、浆喷桩、真空联合堆载预压、塑料排水板超载预压、砂桩超载预压等方法处理高速铁路软土地基及桥梁、涵洞地基的现场试验,对不同方法处理软土地基之间及不同结构物之间的差异沉降进行研究。研究结论:(1)地基处理方法及结构物类型是影响软土地基剩余纵向差异沉降的主要因素,而荷载对剩余纵向差异沉降的影响较小;(2)在填筑完成后的3个月内,横向差异沉降变化较大,对于需要有较长时间预压期(或放置期)的软土地基,横向差异沉降不会对列车运营造成不良影响;(3)建议在设计时同一工点应尽量避免采用不同地基处理方法,若无法避免时应考虑在不同处理方法和不同结构物之间设置过渡段;(4)本研究结果可为高速铁路设计、施工等提供指导。
真空堆载预压加固高速铁路软基的几个问题

铁道工程学报 , 2015,
Abstract: ?研究目的:真空联合堆载预压在高速铁路中的应用很少,其真空压力的传递、孔隙水压力的变化和真空卸载标准等缺乏研究。本文通过采用真空联合堆载预压处理高速铁路软土地基的现场试验研究,对此进行探讨,提出真空预压卸载的控制标准。研究结论:(1)真空预压的卸载标准应采用沉降速率和固结度双控制,沉降速率要达到5~10d不大于1~2mm/d的标准,同时要达到根据需要的工后沉降反算的固结度,固结度要考虑荷载水平,要采用对应后期总荷载水平下的固结度,或者说是采用后期总荷载下的最终沉降作为总沉降来计算固结度,尤其是对于高速铁路,其沉降速率应按照5~10d不大于1mm/d来控制;(2)孔压的上升和消散规律与沉降速率随荷载的发展规律基本一致;(3)真空预压卸载后再加荷,沉降仍然会缓慢增加,沉降速率基本呈收敛状态,但后期收敛的速率较小,由于应力边界条件变化,真空预压卸除后应保证一定的放置调整期;(4)真空度在不同介质中随时间、深度的传递规律是不同的,塑料排水板的通道有利于真空预压压力的传递;(5)本研究结果可为高速铁路设计、施工等提供指导。
Page 1 /326276
Display every page Item


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