摘要：辽宁满族刺绣是辽宁地区少数民族的一种刺绣工艺,是满汉文化交融的一种艺术形式,以淳朴的图案和粗犷、豪放的北方风格而别具一格,其非遗特性在辽宁文化传承中起到了重要作用。辽宁岫岩与锦州满族民间刺绣于2008年入选第二批国家级非物质文化遗产名录。本文通过对辽宁各地满族刺绣的考察、调研、采访,从其历史与传承性、地域与民族性、文化与艺术性、民俗与实用性、非遗传承人及技艺进行分析,梳理辽宁满族刺绣的非遗特性,基于田野调查与图文分析,总结其非遗价值,思考其未来传承方式和发展路径。

摘要：发达的现代通信设备对时钟源器件提出了更高的要求,在保障频率信号稳定的同时还需要器件具备可集成、微型化等特点,微机电系统(MEMS)振荡器因其具备这些优势,已逐渐替代传统振荡器,成为电子设备中信号源的常用元器件。该文设计了一种MEMS振荡器并对其进行仿真测试,该振荡器的核心选频器件由Lamb波压电谐振器组成,在应用于振荡电路前,对设计的MEMS谐振器进行了仿真测试,并提出两种优化其寄生模态的方法,所得谐振器的品质因数(Q)为1357.5,串联谐振频率为70.384 MHz。将优化后谐振器应用于振荡电路后,对振荡器输出信号和相位噪声进行测试,结果表明,MEMS振荡器的输出载波频率为70.58 MHz,相位噪声为-64.299 dBc/Hz@1 Hz及-144.209 dBc/Hz@10 kHz。

摘要：Cryptocurrencies represented by Bitcoin have fully demonstrated their advantages and great potential in payment and monetary systems during the last *** mining pool,which is considered the source of Bitcoin,is the cornerstone of market *** surveillance of the mining pool can help regulators effectively assess the overall health of Bitcoin and ***,the anonymity of mining-pool miners and the difficulty of analyzing large numbers of transactions limit in-depth *** is also a challenge to achieve intuitive and comprehensive monitoring of multi-source heterogeneous *** this study,we present SuPoolVisor,an interactive visual analytics system that supports surveillance of the mining pool and de-anonymization by visual *** is divided into pool level and address *** the pool level,we use a sorted stream graph to illustrate the evolution of computing power of pools over time,and glyphs are designed in two other views to demonstrate the influence scope of the mining pool and the migration of pool *** the address level,we use a force-directed graph and a massive sequence view to present the dynamic address network in the mining ***,these two views,together with the Radviz view,support an iterative visual reasoning process for de-anonymization of pool members and provide interactions for cross-view analysis and identity *** and usability of SuPoolVisor are demonstrated using three cases,in which we cooperate closely with experts in this field.

摘要：本文提出了一种基于Micro LED阵列的车灯投影方案,设计了以像素尺寸为80μm×80μm的200×150白光Micro LED阵列作为显示光源,视场角为16°×34°的车灯投影光学系统,并对物面倾斜角度和光学系统结构进行了优化。此外,分别采用反向畸变处理方法和像素灰度调制方法用以解决车灯投影图像的梯形畸变和照度均匀性问题,并搭建了投影实验平台,对图像校正方法进行了验证。实验结果表明:校正后图像梯形畸变系数p1,p2分别从0.0932和0.3680下降至0.0835和0.0373,像面照度均匀性从83.2%提高到93.2%。本文通过对基于Micro LED的倾斜投影车灯光学系统进行优化设计及采用图像校正方法,实现了高光效、低畸变的车灯投影。

摘要：偏航偏转控制有利于减小风机尾流效应,通过场级偏航协调优化减小尾流损失,可使风电场总发电量达到最大化。采用FLORIS尾流代理模型,以各风机偏航角为优化对象,风电场总功率最大为优化目标,进行场级偏航寻优。针对不同风机间距、纵列个数、湍流强度、来流风速和来流风向等多个维度,对比分析了偏航优化对尾流损失及功率提升的敏感性。结果表明:当风电场排布间距小于5D、风机纵列大于3台且仅需优化前5排、纵列机位连线与风玫瑰图主频风向夹角小于15°、风场湍流小于0.1、来流风速位于风机“切入风速+2 m/s”至“额定风速+2 m/s”区间时,场级偏航控制对于尾流优化效果最佳;若仅采用单机偏航控制风向,前排风机保留3°~5°偏航误差有利于风电场整体的发电收益。

摘要：针对灌溉区复杂的水质环境导致泵前滤网频繁堵塞需要耗费大量的人力财力等问题,设计一种自动清洗的泵前过滤器。通过滤网出水口压差∆P大于预设压差P作为自动清洗装置控制开启条件,对滤网工作流场进行数学分析,得到控制体体积Q和包围流体的表面积S等相关变量的数学关系,对悬浮箱进行每间隔150 mm采用50 mm的凸凹特征设计,提高悬浮箱的承载强度,对滤网关键参数进行设计,对水泵为滤网出水口提供的6种不同压强进行数值模拟,获得滤网出入口压差∆P,为预设压差P的设置提供参考。最后,对6种不同压强进行试验。结果表明,随滤网出水口压强降低,自动清洗装置启停周期和滤网清洗时间呈现增加的趋势。随着滤网出水口压强降低,滤网出入口压差不断减小,滤网内部叶轮受压力的驱动力减弱,滤网旋转速度变慢,导致滤网清洗需要更长的时间。通过测试试验与应用,过滤器能够有效地阻止砂石和菌藻类生物进入微灌系统,自清洗装置能有效地清洗黏附在滤网上面的砂石和菌藻类生物,完全实现滤网无人清洗,大幅度地降低劳动力。

摘要：合理设计高活性、高选择性、高稳定性、低成本纳米结构催化剂是电催化硝酸根还原制氨的一个重大挑战。采用水热法耦合原位还原法制备了厚度可控的聚吡咯包裹五重孪晶铜纳米线催化剂,实现了低偏压下产氨活性、法拉第效率的提高以及对抗腐蚀能力的大幅提升。偏压为-0.4 V(可逆氢电极)时T-CuNW-10样品合成氨活性达到13.83 mg·mg^(-1)·h^(-1),偏压-0.7 V(可逆氢电极)时达到23.24 mg·mg^(-1)·h^(-1);中间产物亚硝酸根与产物氨二者加和的法拉第效率(FE)接近100%;腐蚀电流降低至3.14 mA·cm^(-2)。最终实现催化剂高效稳定硝酸根还原制氨性能的提升,可为开发设计工业应用催化剂提供思路参考。

摘要：以微博、B站等平台为例,运用网络民族志与文献研究法,从亚文化服饰群体的互动传播入手展开研究。运用柯林斯的“互动仪式链”理论,分析了亚文化视域下青年群体服饰传播的互动机制、构建要素和构建效果,同时分析了这种互动机制所带来的影响效应,旨在为小众群体服饰的正面治理提供参考。

摘要：为提高分析微结构单胞结构参数对其力学性能影响的效率,提出一种基于ABAQUS二次开发的参数化建模方法。该文以双箭头负泊松比微结构为研究对象:基于ABAQUS二次开发设计参数化建模的图形用户界面(GUI),且采用3D打印方法制造样件开展准静态压缩试验,以验证上述参数化平台所建立有限元模型的准确性;基于此,建立峰值力和比吸能的响应面模型,采用NSGA-Ⅱ多目标遗传优化算法,以峰值力最小、比吸能最大为目标,以θ_(1)、θ_(2)、T_(L)、T_(M)为设计变量,对微结构的冲击性能进行优化,获得最优的微结构拓扑参数。与优化前微结构的冲击性能进行对比分析,结果表明峰值力降低了14.36%,比吸能增加了33.72%。

摘要：Pebble bed reactors enable the circulation of pebble fuel elements when the reactors are in *** unique design helps to optimize the burnup and power distribution, reduces the excessive reactivity of the reactor,and provides a mean to identify and segregate damaged fuel elements during operation. The movement of the pebbles in the core, or the kinematics of the pebble bed,significantly affect the above features and is not fully understood. We designed and built a detection system that can measure 3-axis acceleration, 3-axis angular velocity,3-axis rotation angles, and vibration and temperature of multiple pebbles anywhere in the pebble bed. This system uses pebble-shaped detectors that can flow with other pebbles and does not disturb the pebble movement. We used new technologies to enable instant response, precise measurement, and simultaneous collection of data from a large number of detectors. Our tests show that the detection system has a negligible zero drift and the accuracy is better than the designed value. The residence time of the pebbles in a moving pebble bed was also measured using the system.