摘要：This paper presents and verifies a new idea for constructing an ultrasonic motor （USM）. The stator contains several vibrators fabricated by bonding piezoelectric ceramics （PZTs） to a metal base. When two alternating current （AC） voltages with a 90° phase difference are applied to the PZTs, longitudinal and bending modes are excited in the vibrator. The bending vibrations of the vibrators are stacked to form the torsional vibration of the stator, ultimately generating longitudinal-torsional composite vibration. Both vibrators and the stator are excited to the resonance state. A standing wave is formed by superposition of longitudinal and torsional modes. The proposed motor is an in-plane vibration motor because the vibrations of the stator are in the circumferential plane. The finite element method （FEM） is used to validate the feasibility of the proposed motor. The fabricated stator contains five vibrators. The tested resonance frequencies of longitudinal and torsional modes are 44.42 kHz and 43.83 kHz, respectively. The stall torque is 0.3 N＇m and no-load speed is 45 r/min. The highest efficiency is 30%. The applied driving voltage is 100 Vo.p （peak voltage） at 43.9 kHz. The designed motor is a parallel-actuated integral motor. It allows the vibrators to operate synchronously, and overcomes asynchronous issues that occur in traditional multi-vibrator motors.

摘要：发现和优化纳米复合材料可以通过融合从头算方法和机器学习(ML)来实现,目前的瓶颈在于缺乏原子尺度上描述单体间相互作用的ML模型.我们开发了名为双区域网络(DRN)的深度学习算法,通过训练学习原子之间的多尺度交互作用,预测了由337种不同分子组成的分子对在随机构型中的电子耦合强度,平均绝对误差低至2.8 meV.基于两种截止半径的层次化材料表象被证明对DRN模型的高迁移性和鲁棒性至关重要,这种材料表征方式不仅捕获了共轭片段的局部特征,而且在模型训练之前编码了重要的分子片段间相互作用.本研究建立的ML模型为描述单体间相互作用提供了普适的建模框架,为复杂纳米复合材料的逆向设计打下了基础.

摘要：The large fire door is the key component to ensure the effectiveness of fire zone in AP1000 nuclear *** to the fire design requirements and design criteria,the global structure of the large fire door is *** on the designed structure,the thermal mathematical model of the large fire door is *** on the solid heat transfer theory,the multi-layer heat transfer theory and integrated heat transfer theory,the differential equations of heat conduction,initial conditions,and boundary conditions are *** analysis for the fire door leaf and the closure is carried out by using the method of numerical *** show that:considering the thermal load,the whole structure of the large fire door can meet the fire resistance limit of 3 hours and the design is reasonable and *** study provides theory basis for the design of the large fire door.

摘要：近年来,自治式潜水器(AUV)的快速发展,极大地扩展了水下传感器网络(UWSN)的应用。针对在移动场景下那些邻居节点少或与邻居节点的距离远的异常节点在传输数据时容易失败的问题,在改进局部离群因子(LOF)检测算法的基础上提出一种基于异常检测和AUV辅助的可靠节能路由(RERA)协议。RERA协议提出了适用于UWSN的异常节点筛选机制,筛选出的异常节点只转发时延敏感数据,对于时延不敏感的数据使用AUV辅助传输。此外,优化了遗传算法,设计了高效的AUV路径规划算法。同时,为了避免无序的数据传输导致的冲突,引入一种AUV辅助传输调度规则。仿真实验验证了优化遗传算法的性能和AUV的辅助性能,并与现有的协议进行了比较。结果表明,RERA协议在AUV覆盖率、AUV航行时间、数据交付率、能耗等方面均表现出较优的性能。

摘要：针对故障件日常管理中存在的问题,总结故障件传统管理方式的缺陷,提出借助信息化技术手段创建新型管理方式,通过对故障件维修过程中涉及的关键角色——过程域和业务逻辑关系的分析,设计出贴合现场工作场景的故障件维修管理模型,实现对故障件维修及再利用的全程管控,达到降本增效的目标。最后通过对管理模型的应用化,建立故障件管理平台,验证故障件维修管理模型具有可操作性和实用性。

摘要：国内工厂生产过硫酸铵大多采用工艺简单且产品纯度高的电解法,但是电解法在生产过程中存在能耗过高的问题。这一问题限制了过硫酸铵在许多领域的进一步发展。针对这一现象,对硫酸铵电解生成过硫酸铵的设备及工艺进行设计和研究,以期达到降低能耗的目的。实验基于零极距和离子交换膜电解槽的设计,研究了加酸量、抑制剂用量、出入口温度和电解液浓度等因素对电解效率的影响。结果表明,在电解液中加酸并且在阳极液中添加抑制剂对提高电流效率和降低槽电压具有很大的影响,在最优条件下电流效率可达到98%,生产过程能耗显著降低。另外,电解槽还具有连续性生产、占地面积小的优势,进一步解决了厂家所面临的生产成本过高的问题。

摘要：本文以液压膨胀芯轴为研究对象,利用CAD软件建立直筒式液压膨胀芯轴三维简化模型,基于现有理论知识和液压膨胀芯轴内部结构特性进行正交实验设计,选取合适的影响因子并为因子设定相同数量的水平数,利用有限元软件进行静力学分析得到实验结果。对实验结果进行综合分析,得到最优组合,对延长芯轴使用寿命非常具有实践意义。

摘要：本文分析了体育场馆照明眩光产生的原理及影响眩光的因素,提出了一种实用的体育场馆区域照明的眩光评价系统及其简化方法。该评价系统不仅可以使用合适的测试仪表来核查已存在的照明设施的眩光状况,还可以在新照明装置的设计阶段用来预测眩光程度。详细说明了主要应用范畴的一般眩光等级限制。

摘要：Deep large span cut holes are difficult to stabilize. The 7801 cut hole in the Lu'an Wuyang Mine was used as this project's background. The main factors affecting large span cut hole stability are analyzed. Pre- stressed bolting theory was used to design a roof control method for a large span roadway. By reducing the span and applying equal strength coordinated supports the rock could be stabilized. The control prin- ciples and methods are given herein along with the analysis. A double micro arch cross section roadway is defined and its use in solving the current problem is described. Beam arch theory was used to build a model of the double micro arch cross section roadway. A support reverse force model for the arch foot intersection was also derived. A support method based upon reducing the width of the large span in the cut hole is presented. These results show that the reduced span of the roadway roof plus the use of cable anchors and single supports gives an effective way to control the large span cut hole. On site monitoring showed that the reduced span support from the double micro arch cross section roadway design had a significant effect. The roadway surface displacement was small and harmful deformation of the cut hole was effectively controlled. This will ensure its long term stability.

摘要：人类早期造型艺术的起源与发展反映着原始宗教崇拜的三个不同发展阶段,即:"自然崇拜"、"图腾崇拜"、和"祖先崇拜"阶段,这是艺术教育及艺术史论研究中划分远古造型艺术发生发展的重要理论基础。从哲学文化的角度重新审视北方民族的造型艺术,可以发现,原始宗教崇拜三个阶段中的早期造型艺术作品在深层上直观地反映着北方民族的共性文化特征,那就是对生命的追问以及生命崇拜的实践,并以此构成了北方民族造型艺术的母题特征——"生命崇拜"。