摘要：契诃夫总在变着花样讲故事,让故事的讲法也成为一个故事,甚至比故事更有故事。本文以短篇小说《罗斯柴尔德的小提琴》为例,从悬念、视角、意象、语言四个诗学要素入手,揭示其叙事诗学的魅力。悬念源于解悬的延宕、信息的遗落、话语的留白、叙事链环的缺失;意象是隐喻滋生的地方,是人物生命言说和情感勃发的要地,是人物个体的生命经验与作家对生命和人性思考相联结的艺术支点;多重视角是不同意识主体声音的交杂、重叠,是揭示人物性格、内心世界,表达情感的言说策略;小说语言是高度“意象化”的,作家将意象的隐喻、象征机制运用到了语言中。独特的叙事诗学手段大大拓宽、增生了小说叙事话语的意义空间,其中潜藏着一种逆向的,或者说反转的文本接受原则。只有反复阅读小说,自后向前做反向观照,才能真正把握小说深邃的审美意蕴,体验到契诃夫的比故事更有故事的故事讲法的艺术魅力。

摘要：This study provides details of the energy management architecture used in the Goldwind microgrid test bed. A complete mathematical model, including all constraints and objectives, for microgrid operational management is first described using a modified prediction interval scheme. Forecasting results are then achieved every 10 min using the modified fuzzy prediction interval model, which is trained by particle swarm optimization.A scenario set is also generated using an unserved power profile and coverage grades of forecasting to compare the feasibility of the proposed method with that of the deterministic approach. The worst case operating points are achieved by the scenario with the maximum transaction cost. In summary, selection of the maximum transaction operating point from all the scenarios provides a cushion against uncertainties in renewable generation and load demand.

摘要：针对四轮独立驱动与转向(4WID-4WIS)型港口重载自动导引车(AGV)常见的驱动电机失效情况,提出了三层控制结构的容错控制策略来进行转向稳定性容错控制。上层控制模块设计为模型预测控制器(MPC)与PI车速跟随控制器,实现港口AGV的路径跟踪;中层控制模块设计为横摆角速度、质心侧偏角RBF神经网络鲁棒滑模控制器,用来计算出最佳附加横摆力矩;下层控制模块设计为失效分配策略,对力矩进行重新分配。最后,搭建了CarMaker测试平台,通过实验验证了容错控制策略的有效性与优越性。

摘要：[目的]目前,城市轨道交通列车在日常运行中缺少对轴箱、齿轮箱、牵引电机等关键部件运行状态的监测手段,无法实现关键部件的故障预警和跟踪,难以满足列车精准维修的要求,为适应车辆智能运维技术发展需要,需研究解决列车关键部件运行状态监测及故障预警问题。[方法]结合铁路车辆综合监测技术应用现状,提出在线路轨旁设置基于光热成像技术和声学诊断的综合监测设备,采集列车运行中关键部件的温度和噪声等信息,通过建立故障判定模型,实现对列车关键部件的动态监测和故障诊断。[结果及结论]光热成像技术具有探测部位多、探测覆盖范围大、车型适应性强、探测准确、探测结果直观等特点,与声学诊断等技术相结合,可实现列车关键部件运行状态实时监测和故障诊断,为列车实施精准维修提供技术支撑。

摘要：Emerging quantum dots(QDs)based light-emitting field-effect transistors(QLEFETs)could generate light emission with high color purity and provide facile route to tune optoelectronic properties at a low fabrication *** efforts have been devoted to designing device structure and to understanding the underlying physics,yet the overall performance of QLEFETs remains low due to the charge/exciton loss at the interface and the large band offset of a QD layer with respect to the adjacent carrier transport ***,we report highly efficient QLEFETs with an external quantum efficiency(EQE)of over 20%by employing a dielectric-QDs-dielectric(DQD)sandwich *** DQD structure is used to control the carrier behavior by modulating energy band alignment,thus shifting the exciton recombination zone into the emissive ***,enhanced radiative recombination is achieved by preventing the exciton loss due to presence of surface traps and the luminescence quenching induced by interfacial charge *** DQD sandwiched design presents a new concept to improve the electroluminescence performance of QLEFETs,which can be transferred to other material systems and hence can facilitate exploitation of QDs in a new type of optoelectronic devices.

摘要：随着低比容量硅碳复合材料(300%)所带来的一系列问题。在材料结构方面,从最初的硅材料纳米化、硅与其他材料复合等技术手段转变到了硅碳复合材料二次颗粒的结构设计、表面包覆层设计等方法;在应用性能方面,除了早期文献报道的材料比容量、循环性能等参数外,还增加了材料比表面积、振实密度、首次及循环库仑效率等更符合电池实际应用要求的性能参数研究,从而极大地推动了硅基负极材料的商业化应用进程。本文首先综述了近年来硅碳复合材料组成、结构设计的发展脉络,进一步分析了由石墨、软碳、硬碳、碳纤维和石墨烯等碳源合成的硅碳复合材料的结构特点,并对其电化学性能进行分析对比,总结了碳在硅碳复合材料结构及其性能上发挥的作用。最后,对硅碳复合材料制备过程中的结构设计要求和碳材料的选择进行了分析和展望。

摘要：本文运用一种由小到大(设计尺寸),循序渐进的设计思路和计算方法,介绍了压接编织层式的射频同轴连接器压接外壳、压接管和压接模块在设计时的相关尺寸的确定。目前压接管热处理工艺还不完全成熟,压接后反弹大,希望从尺寸设计方面能够弥补和提高电缆与连接器拉力,保持力的可靠性。

摘要：The hadal zone(ocean depths of 6 – 11 km) is one of the least-understood habitats on Earth because of its extreme conditions such as high pressure, darkness, and low temperature. With the development of deep-sea vehicles such as China's 7000 m manned submersible Jiaolong, abyssal science has received greater attention. For decades, gravity-piston corers have been widely used to collect loose subsea-sediment long-core samples. However, the weight and length of the gravity sampler cables and the operating environment limit sampling capacity at full ocean depths. Therefore, a new self-floating sediment sampler with a spring-loaded auto-trigger release and that incorporates characteristics from traditional gravity-driven samplers is designed. This study analyzes the process by which a gravity-piston corer penetrates the sediment and the factors that affect it. A formula for obtaining the penetration depth is deduced. A method of optimizing the sampling depth is then developed based on structure design and parametric factor modeling. The parameters considered in the modeling include the sampling depth, balance weight, ultimate stress friction coefficient, dimensions of the sampler, and material properties. Thus, a new deep-sea floating parametric sampler designed based on virtual prototyping is proposed. Accurate values for all the design factors are derived from calculations based on the conservation of energy with penetration depth, analyses of the factors affecting the penetration depth, and analyses of the pressure bar stability. Finally, experimental data are used to verify the penetration-depth function and to provide theoretical guidance for the design of sediment samplers.

摘要：本文从移动通信演进规律和泛在性出发,研究第六代移动通信系统(sixth generation, 6G).在前期引入代表智慧或意识的"灵"的基础上,提出6G信息交换中枢Ubiquitous-X网络,使人–机–物–灵的新通信对象全面协作和融合于现有网络,以构建未来的6G网络.针对Ubiquitous-X网络构架面临的信息密度非均匀增长导致的传播非线性、信息维度增加导致的信息空间高维性、承载服务差异化导致的信息处理复杂性3大挑战,借鉴复杂系统耗散理论和信息负熵促进有序的思想,给出设计与优化Ubiquitous-X网络的演进范式和核心技术,为6G研究提供参考.

摘要：测量标志是地理信息成果的重要载体,是国家重要的基础测绘资源,事关国家基准安全和国防安全,在服务经济建设、国防建设、社会发展、生态文明建设等方面具有举足轻重的作用。针对目前我国测量标志保护工作投入不足、重视不够、保护措施不到位的现状,整理近年来国家、省市重点基准建设项目高等级测量标志的普查资料发现,我国12个省市的测量标志破坏率均值为24.6%,其中因基建原因造成的破坏占比为92.1%,全部省份每10年的破坏速率均值为30.0%。剖析了造成标志破坏的主要因素,并在多年野外普查作业实践的基础上,从7个方面提出了测量标志保护工作的思路和可行性举措。