摘要：It is necessary to reduce hydrogen consumption to meet increasingly strict environmental and product-quality regulations for refinery plants. In this paper, the concentration potential concepts proposed for design of water-using networks are extended to synthesis of hydrogen networks with multiple contaminants. In the design procedure, the precedence of processes is determined by the values of concentration potential of *** usage of complementary source pair(s) to reduce utility consumption is investigated. Three case studies are presented to illustrate the effectiveness of the method. It is shown that the design procedure has clear engineering meaning.

摘要：本文设计了一种新型的水平活板门试验装置。该试验装置可以用于砂土地层盾构隧道开挖面稳定性分析。该试验系统可以同时研究工作面破坏的纵断面和横截面。本文使用该装置在单重力条件下对小型模型隧道进行了开挖面稳定性试验,研究了不同砂土材料和覆土厚度条件下的侧向土压力和破坏区域。结果表明,随着开挖面的向后移动,开挖面上的主动土压力迅速下降至残余值。同时在破坏过程中,侧向土压力分布可分为三个阶段:1)初始状态阶段;2)压力减小阶段;3)压力区减小阶段。此外,开挖面破坏首先从稳定状态发展到局部破坏状态,然后继续发展到整体破坏状态。整体破坏状态的失稳区域可分为旋转破坏区(下部区域)和重力破坏区域(上部区域)。这两个区域具有不同破坏机制。进一步讨论表明,在土拱效应下,重力破坏区的形状可分为拱形(最常见)和柱形(浅埋隧道)。开挖面稳定的极限支护压力一般出现在δ/D=0.2%~0.5%(掌子面位移与洞径之比)。

摘要：the Information-Centric Networking(ICN) paradigm is proved to have the advantages of decreasing data delivery latency, enhancing user mobility, etc. However, current implementations of ICN require changing the infrastructure of Internet, which hinders its deployment and development. Meanwhile, Software Defined Networking(SDN) emerges as a viable solution to facilitate the deployment of new network paradigm without disrupting production traffic by decoupling the control plane from data forwarding plane. In this paper, the essential properties which reflect ICN working principles are summarized, and a framework called SDICN is designed in accordance to the SDN philosophy. The algorithmic frameworks of SDICN which can satisfy the essential properties are designed based on the programmability and virtualization functions of SDN. Based on Open Flow and data center technology, a prototype of SDICN is implemented. By comparing the performance with the CCNx, the SDICN is proved to be feasibility and availability.

摘要：对于航天推进和发电燃气轮机,为了实现更高的效率和性能并同时降低成本和排放,需要发展先进的镍基单晶高温合金。随着合金的发展,合金的铸造技术已经从定向凝固(DS)发展到单晶(SX)。单晶取向与择优取向的偏差已经成为单晶高温合金最重要的铸造缺陷之一。在自行设计的高温度梯度定向凝固装置中,采用改进的Bridgeman法,用螺旋选晶器拉制出DZ417G合金的单晶。使用XRD和EBSD对其取向进行分析研究。结果表明:较小角度的螺旋选晶器可以有效地减少单晶取向与择优取向的偏差。

摘要：实际状态下的土体一般是非饱和的。基于极限分析理论,本文开展了稳定渗流作用下加筋土加固非饱和土边坡的稳定性分析。借助有效应力法对基质吸力引起的表观黏聚力功率进行了计算,从边坡稳定的能量平衡方程中推导出了维持边坡稳定的所需黏聚力和稳定性系数,并编制了最优化程序来捕捉稳定性系数最优解。文章进行对比分析以验证本文所采用方法的有效性,其后采用参数响应分析的手段以探讨土体类型、渗流速率、加固强度以及土体基质吸力对边坡稳定性的影响。为方便初步设计使用,文章最后给出了一系列的稳定性系数最优解。

摘要：提出了在飞秒锁模钛宝石激光器腔内产生太赫兹辐射的新设计方案,并给出了太赫兹产生器件的结构参数以及器件的设计原理。新设计的器件把光电导太赫兹偶极天线发射器与飞秒钛宝石激光器的可饱和Bragg反射镜结合在一起,不仅可以提高太赫兹辐射的产生效率,而且可以使飞秒钛宝石激光器自启动锁模.

摘要：采用离散元数值模拟分析软件3Dec,依据贵阳开阳磷矿深部硬岩矿床的工程实际情况建立三维数值模拟模型,对开阳磷矿深部硬岩矿床的3种不同开挖工况进行模拟计算,包括在矿体中开挖地压诱导致裂巷道及不同方向(水平向和竖向)、不同顺序(先上后下/先下后上)开挖后的巷道围岩体的位移和塑性区分布情况。结果表明:在矿体中开挖诱导致裂巷道时,巷道周边岩体塑性区和位移场随着暴露时间的延长而不断增大,矿岩朝着有利于破碎的趋势发展,即为掘进机的高效切割回采提供了有利条件;不同开挖方向对充分利用深部地压效果不同,竖向开挖比水平横向开挖可形成更大的位移场和塑性破坏区,地压致裂的效果更明显;先下后上式开挖比先上后下式开挖产生的临空面附近矿岩产生更大的变形量和破坏区,更能有效地利用深部地应力破岩。该研究对开阳磷矿深部高应力硬岩矿体非爆掘进机连续开采的采矿方法设计、充分利用地压破岩和合理确定开挖方式具有重要的意义。

摘要：A high detection efficiency calorimeter which is used to detect γ-rays with energies from 1 MeV up to 10 MeV as well as light charged particles has been proposed. Design of the geometry, results of the crystal tests and Monte Carlo simulations are presented in this paper. The simulation results confirm that the calorimeter can obtain high detection efficiency and good energy resolution with the current designed geometry. And the calorimeter is competent for the future External Target Facility （ETF） experiments.

摘要：低容量和低倍率限制了电池型超级电容阳极材料的大规模应用.本文通过构建一种具有半共格异质界面特性的Fe_(2)O_(3)/FeSe_(2)纳米结构作为先进的阳极材料来解决这一瓶颈.系列表征和第一性原理计算表明,这种特殊的异质界面不仅能自发产生较强的内建电场,从而提高电子传递速率和OH^(-)离子的吸附能力;还可使得活性物质与OH^(-)之间发生更多的氧化还原反应,并且使该反应体系更容易进行.基于上述优势,所制备出的阳极材料的最大比容量为199.2 mA h g^(-1)(1 A g^(-1)),并且在10 A g^(-1)下仍能保持105.8 mA h g^(-1),同时,经历5000次循环后,其比容量可维持初始值的90.2%.此外,以Fe_(2)O_(3)/FeSe_(2)作为阳极组装的非对称超级电容器在0.8 kW kg^(-1)时的能量密度为52.55 Wh kg^(-1),即使经历15,000次循环,该器件还能维持初始容量的91.2%.我们的工作为设计大容量和高倍率性能的电池型超级电容器阳极材料提供了一种创新性的策略,有望推动过渡金属化合物在储能系统中的大规模应用.

摘要：This paper investigates joint design and optimization of both low density parity check （LDPC） codes and M-algorithm based detectors including iterative tree search （ITS） and soft-output M-algorithm （SOMA） in multiple-input multiple-output （MIMO） systems via the tool of extrinsic information transfer （EXIT） charts. First, we present EXIT analysis for ITS and SOMA. We indicate that the extrinsic information transfer curves of ITS obtained by Monte Carlo simulations based on output log-likelihood rations are not true EXIT curves, and the explanation for such a phenomenon is given, while for SOMA, the true EXIT curves can be computed, enabling the code design. Then, we propose a new design rule and method for LDPC code degree profile optimization in MIMO systems. The algorithm can make the EXIT curves of the inner decoder and outer decoder match each other properly, and can easily attain the desired code with the target rate. Also, it can transform the optimization problem into a linear one, which is computationally simple. The significance of the proposed optimization approach is validated by the simulation results that the optimized codes perform much better than standard non-optimized ones when used together with SOMA detector.