Creation of extension knowledge base system about intelligent detection in dendrobium huoshanense photosynthesis process

Aiming at the limitations of the existing knowledge representations in intelligent detection, a novel extension-based knowledge representation (EKR) is proposed. The definitions, grammar rules, and formal semantics of EKR are presented. A rhombus solving strategy (RSS) based on EKR is discussed in detail, including creation of the problem oriented model, extension operator, the solution formation of contradictions problem and extended inference of matter-element. A knowledge base system based on EKR and RSS is developed, which is applied in intelligent detection in the Dendrobium huoshanense photosynthesis process (DHPP). More reasonable results are obtained than traditional rule-based system. The EKR is feasible in intelligent detection to solve the limitations of traditional knowledge representations.     

金融保险市场失灵及政府行为

市场在其运行过程中会出现自身无法解决的问题，存在市场失灵现象。本文就目前我国企业保险市场的市场失灵问题，提出了政府可以在哪些方面有所作为及相应对策，从而解决或减轻市场的这种低效或无效行为。     

新生儿缺氧缺血性脑病预后的早期评估指标

目的　探讨神经元特异性烯醇酶 (NSE)、内源性一氧化碳 (CO)、新生儿行为神经测定 (NBNA)、临床分度法和CT分度法等方法在新生儿缺氧缺血性脑病 (HIE)预后判断早期评估中的意义。方法　对 30例HIE患儿在生后第 2天检测血清NSE浓度和血浆CO水平 ,生后 7d内进行临床分度、CT分度和NBNA评分 ,于生后 6月 - 1岁进行神经发育随访 ,以 10例足月新生儿为对照组。结果　HIE组血清NSE、血浆CO浓度明显高于对照组 (P均 <0 .0 0 1) ;血清NSE、血浆CO浓度之间 ,及它们分别与HIE临床分度、CT分度呈正相关 ,与NBNA评分呈负相关 ;临床分度法、CT分度法、NBNA、血清NSE及血浆CO浓度检测预测预后的敏感性分别为 10 0 %、10 0 %、85 .71%、10 0 %和 83.33% ,特异性分别为 4 5 .4 5 %、4 5 .4 5 %、5 1.6 6 %、5 8.33%和 5 8.33%。结论　临床分度法是预测HIE预后的基础指标 ,血清NSE浓度变化对早期预测HIE预后有较高的价值     

客运调度视频监控系统的研究

为了满足未来客运专线综合调度指挥系统对视频监控系统的需求,开发了基于客运调度的视频监控系统.实际测试表明,系统满足客运调度对视频监控系统的需求,是面向未来综合型调度指挥系统,满足视频信息在调度所共享的需要.     

微弧氧化陶瓷表面无钯活化化学镀铜的研究

用氢氟酸活化方法取代传统的钯胶活化法,在镁合金微弧氧化陶瓷膜表面经化学镀铜制备了陶瓷／铜协合膜层。结果表明,铜层连续均匀地覆盖微弧氧化陶瓷层表面,渗入并填充陶瓷层内部呈网状分布的孔隙,实现了铜层与陶瓷层在呈网络状分布的孔隙处产生机械咬合、钉扎或锁扣。以价健理论分析了材料表面析氢电催化活性过程,探讨了微弧氧化陶瓷层表面氢氟酸活化机理。     

北京地铁房山线B型车辆制动装置

北京地铁房山线车辆采用国产化制动系统,经过型式试验,制动系统的各项技术指标满足技术要求。主要介绍风源系统、制动控制装置、停放制动控制装置、空气制动防滑控制装置、基础制动装置的基本组成及工作原理。     

从车体静强度试验引发的一些思考

从铁路客车车体静强度试验的具体实例展开讨论,依据试验中出现的问题及采取的解决措施,对照车体静强度的有限元分析结果,对铁路客车的寿命周期进行分析。对现行的铁路客车运用维护及检修等方面提出了相关建议和解决措施。     

Research on the Mechanical Properties of Transparent Sand Based on Triaxial TestEI北大核心

Research purposes: Transparent sand is a new type of geotechnical engineering material, which is made of fused silica sand and porous liquid with the same refractive index. In order to understand its mechanical properties, the CU and CD tests of fused silica sand with a particle size of 0.5~1.0 mm and 1.0~3.0 mm are carried out by triaxial apparatus, and the stress-strain curves, pore water pressure changes and effective stress ratio of the two are compared and analyzed. In addition, E-μ model parameters of coarse and fine sand are calculated respectively, which provide corresponding parameters for further numerical calculations. Research conclusions:(1) The loose sample's stress-strain curve shows hardening characteristics. (2) The coarse particle specimen with steeper stress-strain curve comes to the peak at faster velocity than fine particle specimen. (3)The pore pressure value of the coarse particle specimen is greater than the fine particle, the pore water pressure coefficient of the two shows a decreasing trend with the increase of the confining pressure. (4) Transparent sand can be used to simulate natural sand and the change of diameter can represent different soils. (5) The research results can provide reference for model tests based on transparent soil technique. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

新建电缆盾构隧道近距离下穿既有地铁影响分析

以深圳北环电缆隧道南线下穿深圳既有地铁2号线岗厦北站-华强北站区间工程为依托,通过有限元数值模拟分析新建电缆盾构隧道近距离下穿地铁线路时对既有地铁的影响规律。研究结果表明,既有地铁的竖向沉降随着电缆隧道与既有地铁交叉角度的增加而减小;电缆隧道盾构掘进过程中会对既有地铁结构产生扰动,使其结构发生变形,最大沉降值发生在掘进掌子面后方15~20m;数值分析结果与现场实测数据趋势接近。     

上下层小净距重叠隧道复合仰拱支护工法研究

采用常规施工方案修建小净距重叠隧道时,存在施工风险高、工期长、经济性差等诸多缺点。以重庆铁路枢纽东环线鸡公咀、芭蕉沟重叠隧道为背景,提出一种适用于小净距重叠隧道施工的新方法,并从基本原理和数值计算两个方面对其可行性进行初步探讨,研究结果表明:(1)该工法通过复合仰拱形成了有效的支护承载体系,既降低了下层隧道二衬特殊加强、保护措施的工程投入,也加快了工程进度;(2)上下层隧道支护结构的变形值能够满足规范要求,截面承载能力具有一定的安全储备,夹岩应力状态稳定,重叠隧道支护体系安全可靠。