压裂水平井生产动态模拟器研制

水平井压裂通常是获得经济产量的必要措施，正确预测压裂后水平井的生产动态并进行水平井优化参数设计就显得相当重要。文章结合油藏-裂缝网格系统划分及IMPES差分方法，建立了压裂水平井三维两相生产动态数值模拟模型，模型中将油藏和裂缝当作一个渗流系统处理，针对裂缝划分了不等距油藏-裂缝系统网格，差分后形成大型７对角线性方程组，采用逐次线松弛方法迭代求解，研制开发了水平井压裂数值模拟器，可以模拟不同裂缝条数、裂缝间距以及储层参数和裂缝参数对生产动态的影响。与现场水平井实例对比，证明了模拟器计算结果合理可靠，具有推广和使用价值。     

Analysis on mass flow rate of R22 and R407C through coiled adiabatic capillary tubes with GA and PSO optimized BP networks

Journal of Mechanical Science and Technology - R22 and R407C mass flow rates through straight and coiled adiabatic capillary tubes are analyzed with three ANN models, i.e., the feed forward network...     

A lightweight authentication scheme based on self‐updating strategy for space information network

The security of space information network (SIN) is getting more and more important now. Because of the special features of SIN (e.g., the dynamic and unstable topology, the highly exposed links, the restricted computation power, the flexible networking methods, and so on), the security protocol for SIN should have a balance between security properties and computation/storage overhead. Although a lot of security protocols have been proposed recently, few can provide overall attacks resistance power with low computation and storage cost. To solve this problem, in this paper we propose a lightweight authentication scheme for space information network. It is mainly based on the self‐updating strategy for user's temporary identity. The scheme consists of two phases, namely, the registration phase and the authentication phase. All the computing operations involved are just hash function (h), the bit‐wise exclusive‐or operation (⊕), and the string concatenation operation (||), which are of low computation cost. The security properties discussion and the attacks–resistance power analysis show that the proposed authentication scheme can defend against various typical attacks, especially denial of service attacks. It is sufficiently secure with the lowest computation and storage costs. Furthermore, the formal security proof in SVO logic also demonstrates that the scheme can satisfy the security goals very well. Copyright © 2016 John Wiley & Sons, Ltd.     

大直径钢管混凝土柱抗震性能试验研究及承载力计算

为研究径厚比对大直径钢管混凝土柱抗震性能的影响，进行了2个直径600mm圆钢管混凝土柱试件在恒定轴向压力和水平往复荷载作用下的加载试验，对比分析了不同径厚比(分别为37.5、50.0)试件的破坏形态、滞回特性、钢管应变发展规律以及核心配筋的受力情况。试验结果表明：大直径钢管混凝土柱在压弯荷载作用下，滞回曲线非常饱满，耗能性能优越，均表现出良好的变形能力。随着试件径厚比加大，最大位移角与等效阻尼比均略有减小。柱根部混凝土压溃、钢管鼓曲主要发生在支座底板与下部第一排栓钉之间，栓钉对管壁面外变形具有明显的约束作用；当径厚比较小时，钢管管壁对混凝土的约束作用较强，残余变形较小。核心纵向钢筋基本处于弹性状态，箍筋未屈服，对内部混凝土的约束作用较小，但钢筋与混凝土之间存在明显的滑移现象。大直径钢管混凝土压弯构件的受弯承载力试验值显著高于按照我国现行相关规范、规程公式得到的计算值，说明采用我国现行相关技术规范中的承载力计算公式进行大直径钢管混凝土柱设计，结果偏于安全。     

MD算法在集群系统中的并行实现研究

讨论了分子动力学算法在集群系统中的并行实现问题。在分析分子动力学算法原理的基础上，提出了一种基于BSP模型的分子动力学并行算法，并对算法的性能进行了分析。     

基于粗糙集理论的电子镇流器故障诊断方法

将粗糙集理论引入电子镇流器的故障诊断,提出了一种基于粗糙集理论的电子镇流器故障诊断方法.通过对论域进行降维,大大降低了计算复杂性.在此基础上通过属性约简和值约简,导出了有用的诊断决策规则.实例分析表明,将粗糙集理论应用于镇流器故障诊断,可得到清晰、简明的诊断规则,提高了故障诊断的能力,对进行在线质量控制具有实际应用价值.     

不同场景下基于AHP-TOPSIS退役电池梯次利用综合评价

退役动力电池的综合利用是目前可再生能源发展迫切需要解决的问题，在计及电池容量损耗的基础上综合考虑退役电池在不同应用场景下的经济效益、运行效益、环境效益、安全性以及资源利用效率，基于AHP-TOPSIS构建综合评价模型。将某用户侧梯次利用储能电站和某通信基站作为算例，结果表明动力电池梯次利用在以上2个应用场景下具有一定可行性。     

Production planning problems with joint service-level guarantee: a computational study

We consider a class of single-stage multi-period production planning problems under demand uncertainty. The main feature of our paper is to incorporate a joint service-level constraint to restrict the joint probability of having backorders in any period. This is motivated by manufacturing and retailing applications, in which firms need to decide the production quantities ex ante, and also have stringent service-level agreements. The inflexibility of dynamically altering the pre-determined production schedule may be due to contractual agreement with external suppliers or other economic factors such as enormously large fixed costs and long lead time. We focus on two stochastic variants of this problem, with or without pricing decisions, both subject to a joint service-level guarantee. The demand distribution could be nonstationary and correlated across different periods. Using the sample average approximation (SAA) approach for solving chance-constrained programs, we reformulate the two variants as mixed-integer linear programs (MILPs). Via computations of diverse instances, we demonstrate the effectiveness of the SAA approach, analyse the solution feasibility and objective bounds, and conduct sensitivity analysis for the two MILPs. The approaches can be generalised to a wide variety of production planning problems, and the resulting MILPs can be efficiently computed by commercial solvers.     

常减压蒸馏与催化裂化联合装置接口控制方案的优化设计

联合装置间接口的设计，不是一个新的概念，但是一直没有引起设计人员的足够重视，给现场操作，特别是装置开停工操作造成了很多不便，也造成了大量的能源浪费。根据设计经验，结合生产实际，详细论述了常减压蒸馏与催化裂化热联合装置接口控制方案的优化设计，对上下游热联合装置的设计和生产操作具有指导意义。     

基于最大熵模型的通天河流域岩画景观分布研究

景观考古视角下岩画的价值不仅仅是图像语义本身,更是先民与环境互动产生的遗迹,尤其是岩画的分布特征可以作为理解历史环境变迁和人地关系演化的重要切入点。以通天河流域岩画作为研究对象,根据考古调查报告对已发现岩画点进行整理,利用GIS平台构建岩画数据库;然后运用K均值聚类法将岩画依据空间位置划分为4个岩画群,进一步选取影响岩画分布的8个潜在变量,综合运用成本表面分析法、累积可视域法等方法计算并提取对应变量的空间属性信息;运用最大熵模型对通天河流域岩画整体和各岩画群分别建立考古遗址预测模型。结果显示：该地区各岩画群彼此间分布特征差异大,但岩画群内部具有相似性。从上游早期至下游晚期的岩画,其分布受河流、遗址点可达性的影响逐渐减小,受高程、植被覆盖等因素的影响增大,这种变化是对该地区早期人类迁徙与适应环境过程的反映。最后,结合预测结果绘制出各岩画群潜在的分布概率图,可作为岩画景观保护范围划定的依据。