杏9-丁1-更338井区异常高压层组形成原因分析

针对杏9-丁1-更338井在钻井过程中出现的复杂情况,综合完井电测曲线特征,确定霞井区在SⅢ4-SⅢ7存在异常高压。本文从测井原理入手分析了异常高压对完井电潮曲线中微电极,自然电位曲线的影响;从基础井网,一次加密井网钻井和完井电测曲线的正常显示到更新井钻井及完井电测曲线出现的异常显示分析了异常高压形成的时间;从注水井套损、注采关系,地下砂体的发育情况分析了异常高压形成的原因和分布范围。通过以上原因分析和论述对油田开发中预防套损,减少层间和平面矛盾起到了借鉴作用,从而为更好地开发油田、减少钻井过程中出现复杂情况奠定了基础。     

扩展尾流激光雷达动态范围的举动式接收系统

针对水下航行体尾流激光雷达近场后向散射信号强、易导致接收系统饱和的难题,采用电流模式电路设计理论设计了一种举动式水下激光雷达接收系统．该系统充分挖掘接收电路的动态范围利用率,在探测周期内产生举动电流,将输出电压的基点由0V调整到跨阻放大器正向饱和电压附近,有效扩展了动态范围区间,使接收系统对近场信号的接收动态范围有效利用率提高约40％,而举动式电路部分的存在导致的系统带宽减小幅度仅为13％．该系统已成功应用于尾流激光雷达样机并进行了海试,结果表明：该系统完全可以满足大动态范围尾迹探测的需求,可广泛应用于各种大气和水下后向散射式脉冲激光探测系统．     

城市供水管网流量监测点优化选址的研究

结合输配水管网拓扑结构图论模型，通过计算节点流量变化对管网各管段流量的影响程度，引入有效监测范围的概念，求出在给定有效监测级下的有效监测矩阵，采用计算非多余支配集和最小覆盖集的方法。提出了一种城市供水管网流量监测点的优化选址方法，为城市供水系统正确调度和对供水事故的监控提供有效的依据，并通过实例验证了方法的可靠性和有效性．     

端锚预应力锚杆作用范围研究及其应用

为分析锚固体力学效应及端锚预应力锚杆作用范围,并用以优化支护参数,提供施工指导.在挤压加固理论的基础上,利用弹性力学分析方法,建立端锚预应力锚杆锚固范围计算模型.借助Mathematic数学处理软件求得锚固范围方程.在Matlab基础上分析锚固范围方程特性,得出锚固范围与有效锚固长度和有效预应力的关系.研究表明:锚固范围随有效锚固长度和有效预应力的增加而增大;在目前矿山常用有效锚固长度和有效预应力下,最优锚固间距位于0.6～1.4m之间;锚固外区呈锥体状,锥体底面直径为最优锚杆间距,锥体高为有效锚固长度的10%,锥体底边角在7°～29°之间.将锚固范围方程应用于新城金矿的预控顶支护,得到预控顶预应力树脂锚杆锚固范围,求得最优锚杆支护间距1.2m,支护百分比79.3%,锚固外区锥体高0.19m,底边角17.6°.     

Effects of encoding and retrieval on the mechanism of item + context binding

To investigate the neural mechanism of semantic representation and color context binding, we used electroencephalograph time frequency and coherence analyses to reveal local and long-range functional coupling in the encoding and retrieval phases of episodic memory. Fifteen undergraduates participated in the experiment and middle-frequency double-character Chinese words were used as stimuli in two types of study-test tasks (context recall and context recognition tests). Significant differences between item+context and item in the encoding phase were observed at the electrodes in the frontal region at 600–800 ms by time frequency analysis. Further differences were observed at 800 ms by independent component analysis: the frontal component and the coherent component of the triangle phase locking structure among the prefrontal, right parietal and left parietal-occipital regions. In the retrieval phase, differences between item+context and item were found on the electrodes at the central parietal and parietal-occipital regions at 400 ms by time frequency analysis, on the parietal-occipital component at 800 ms by independent component analysis and on the coherence component of the anterior right hemisphere and parietal-occipital regions at 1400 ms. In conclusion, the different effects of encoding and retrieval processing on ‘binding’ are reflected by the differing extents that brain regions engaged in cognitive operations. In the retrieval phase in particular, activities of the parietal-occipital region were specifically associated with ‘binding’, and coherence between frontal and temporal-parietal regions is a common brain activity in episodic memory.     

城市轨道交通开发利益影响范围研究

从理论上分析了城市轨道交通开发的受益对象,并通过案例分析了各受益主体的受益情况.在此基础上,以札幌市轨道交通线路以及上海地铁1号线莘庄站和莲花路站为对象,调查分析了城市轨道交通沿线房地产价格与车站距离的关系.同时,从城市轨道交通沿线区域可达性的角度,探讨了建立城市轨道交通开发利益影响范围理论计算模型的方法.研究结果表明城市轨道交通对沿线房地产价格的影响是有一定范围的;沿线房地产价格与车站的距离成反比关系;且车站离开市中心越远,对周边房价的直接影响范围就越大.     

An approach to improving the dynamical extended—range（monthly） prediction

Focusing on common and significant forecast errors-the zonal mean errors in the numerical prediction model,this report proposes an approach to improving the dynamical extended-range(monthly) prediction.Firstly,the monthly pentad-mean nonlinear dynamical regional predic-tion model of the zonal-mean haight based on a large number of historical data is constituted by employing the reconstruc-tion phase space theory and the spatio-temporal series pre-dictive method.The zonal height thus produced is trans-formed to its counterpart in the numerical model and fur-ther used to revise the numerical model prediction during the integration process.In this way,the two different kinds of prediction are combined.The forecasting experimenal results show that the above hybrid approach not only re-duces the systematical reeor of the numerical model,but also improves the forecast of the non-axisymmetric components due to the wave-flow interaction.     

气体成分对等离子体斑图的影响

采用双水电极介质阻挡放电装置,在大气压下研究了氩气和空气混合气体中气体成分对等离子体斑图(包括四边形斑图和六边形斑图)的影响.四边形斑图和六边形斑图的电压范围随着空气含量的增加而逐渐增大.实验测量了击穿电压随空气含量变化的关系.结果发现:击穿电压随着空气含量的增加而增大,但不成简单的线性关系.在氩气放电中,击穿电压值随着放电间隙的增大而增大.     

新能源汽车：机遇与挑战并存

公元21世纪,世界范围内一场围绕新能源汽车展开的争霸战正愈演愈烈,全球乃至中国也掀起了一场“军备”竞赛。在全球市场上,新能源汽车20年之战的焦点逐渐明确,混合动力车已被普遍认为是迈向氢动力车的最佳过渡产品,与纯电动车和乙醇燃料车相比,不会涉及油料供应系统和基础设施的改变,方便市场推广和使用。混合动力车在工作原理上与氢动力车有内在联系,前者可以为后者提供很好的技术储备。     

深厚覆盖层上高土石坝抗震稳定性的三维分析

常规的拟静力方法不能反映出深厚覆盖层上高土石坝的动力特性,而应从坝体材料的动力稳定性、坝体地震后的永久变形和坝坡地震过程中稳定安全系数时程变化等方面综合评价大坝的安全性.结合一工程实例,建立了深厚覆盖层上高土石坝的三维有限元动力分析模型,对大坝的抗震稳定性进行分析及评价.研究表明: 坝体中较大的加速度数值集中在坝顶向下1/3的坝高范围,而此处以下部分的加速度数值与基岩加速度数值大致相同或略小;地震过程中,坝坡最危险安全系数滑弧由静力最危险滑弧逐步向坝顶方向移动.