摘要：半导体晶圆在国防、光电器件等领域有广泛应用,针对晶圆检测过程中由于电阻率分布不均匀导致的精度低等问题,提出研制一种完全国产化四探针晶圆检测装置,并对其探针压力对电阻率的影响展开研究。首先,引入探针压力为变量,构建基于开尔文的垂直四探针载流子扩散流密度模型;其次,对整机进行设计,采用LK-G5000激光传感器检测导轨和转台的运动精度验证检测平台精度;最后,通过标定最佳压入深度区间段的压电与压入深度之间的关系后验证检测装置性能。实验结果表明,在(23±1)℃,湿度55%RH下,探针预热后针温稳定时电阻率分布稳定、均匀,其电阻率均值误差稳定在3.397%,标准偏差在2.865%,达到检测指标。

摘要：Dermal armor,such as fish scales or armadillo osteoderms,has been known to exhibit high performance and good flexibility defending against *** top layer of the dermal armor usually consists of a segmented hard bony *** soft inner layer composed of collagen fibers connects and holds the hard *** by the dermal armor of armadillos,bioinspired protection armor is studied for impact *** hexagonal scales tessellate the surface continuously and work as the hard bony layer protecting the soft inner layer from ***-high molecular weight polyethylene(UHMWPE)is used as the connectivity layer to support and hold the *** investigate the dynamic response of the bioinspired protection armor,drop weight impact tests are carried out.A finite element model is established to study the dynamic response of bioinspired protection *** impact process images captured by a high speed camera and the experimental data of drop hammer acceleration tests verify the validity of the numerical *** dynamic resistance behavior and the synergy effect of each part of the bioinspired protection armor combined with the protected objects are studied in detail by numerical *** results show that the bioinspired protection armor has marked energy absorption ability.A synergistic dissipation mechanism is activated in the impact process,which can dissipate impact energy and make the impact load distribution more *** UHMWPE between the outer layer and the soft substrate plays a significant role not only related to support and connection,but also for the force balance and energy *** mechanism of energy absorption of the bioinspired protection armor revealed in this paper can be taken as a new guideline for designing a novel protective armor.

摘要：【目的】在智能电网快速发展的背景下,配电网作为电力传输与分配的关键环节,其数据的有效管理和分析对于保障电网稳定运行、提升供电质量至关重要。然而,配电网数据种类繁多且复杂,涵盖了用户用电行为、天气情况、设备基础信息及营销数据等多个维度。不同类型的数据在采集和传输过程中,会因磁场信号、噪声信号、冗余数据等干扰出现缺失,不仅增加了配电网运行监控的难度,还为故障分析、状态评估及优化决策等工作带来极大挑战。【方法】为提高数据处理的准确性和效率,提出一种数据缺失情况下的配电网时间序列数据分类算法。根据时间序列数据在配电网中的分布状态,利用平滑算法去除数据噪声,从而显著提升数据的准确性和可靠性,优化因冗余数据干扰而产生的问题。对缺失数据进行增量填补,依据时间序列数据的内在规律和相邻数据点的相关性,对缺失数据进行合理推测和填补,保持了数据的完整性,同时确保了时间序列的连续性和一致性。计算不同时间序列的数据缺失情况,将高维和低维数据状态空间与单元、多元时间序列相结合,凭借维度映射得到数据维度因子,实现簇内分类。【结果】设计方法填补后数据均在原始数据附近,无冗余问题,且分类耗时点均匀分布,呈现出线性趋势,充分展示了其高效稳定的数据处理能力。设计方法分类配电网时间序列数据后,同种类配电网数据聚集且互不干扰,噪声数据大幅减少,相对差异值(RDV)始终保持在0.05以下,特异度在数据缺失率5%~35%的范围内均维持在95.0%以上,显著高于对比方法的91.5%和92.0%。【结论】设计方法通过平滑去噪、增量填补和维度映射等技术手段,有效应对数据缺失带来的挑战,提高了数据处理的准确性和效率。同时,验证了设计方法在保持高分类精度和快速收敛速度方面的优势,表明其能够有效应对数据缺失情况,显著提升配电网数据的分类效果和运行稳定性。该算法研究不仅丰富了配电网数据分析的理论体系,还为智能电网的运维管理提供了实用的技术支持,具有重要的理论价值和现实意义。

摘要：Bending Pneumatic Artificial Muscles(PAMs)are particularly attractive and extensively applied to the soft grasper,snake-like robot,*** extend the application of PAMs,we fabricate a Multi-directional Bending Pneumatic Artificial Muscle(MBPAM)that can bend in eight directions by changing the pressurized *** maximum bending angle and output force are 151°and 0.643 N under the pressure of 100 kPa,***,the Finite Element Model(FEM)is established to further investigate the *** experimental and numerical results demonstrate the nonlinear relationship between the pressure and the bending angle and output ***,the effects of parameters on the performance are studied with the validated *** results reveal that the amplitude of waves and the thickness of the base layer can be ***,multi-objective optimization is performed to improve the bending performance of the *** optimization results indicate that the output force can be increased by 7.8%with the identical bending angle of the initial design,while the bending angle can be improved by 8.6%with the same output ***,the grasp tests demonstrate the grip capability of the soft four-finger gripper and display the application prospect of the MBPAM in soft robots.

摘要：Three-dimensional(3D)bioprinting has been used widely for the construction of hard tissues such as bone and ***,constructing soft tissues with complex structures remains a *** this study,complex structures characterized by both tunable elastic modulus and porosity were printed using freeform reversible embedding of suspended hydrogels(FRESHs)printing methods.A mixture of alginate and gelatin was used as the main functional component of the *** analysis showed that this bioink possesses shear thinning and shear recovery properties,supporting both cryogenic and FRESH printing *** printing capabilities and limitations of cryogenic and FRESH printing were then analyzed by printability tests.A series of complex structures were printed by FRESH printing methods which could not be realized using conventional *** tests and scanning electron microscopy analysis showed that the printed structure is of excellent flexibility and could be applied in various conditions by adjusting its mechanical modulus and porosity.L929 fibroblast cells maintained cell viability in cell-laden-printed structures,and the addition of collagen further improved the hydrogels’***,all results provided useful insight into the building of human soft tissue organ blocks.

摘要：公路建筑控制区的治理具有十分重要的意义,不仅可以防止道路街道化现象的发生,还可以避免道路两侧施工对道路产生影响,切实保障道路的路产路权。若对公路建筑控制区疏于管理,道路两侧将会产生大量的违法建筑,阻挡行车视线、危及行车安全,同时会使道路改扩建时征地拆迁成本加大。

摘要：沼气工程是一项以开发利用养殖粪污为对象,实现农业生态良性循环的农村能源工程。智能化监控技术可以通过采集和监控沼气工程运行过程中各项指标来提高工程运行的稳定性。对沼气工程的主要监测技术、自动化控制技术及其装备研发应用进行了分析,结果表明:沼气工程监控制技术目前存在监测指标不完善、传感器使用寿命低、自动化程度低等问题;为进一步提升沼气工程智能化水平,还应对发酵过程机理进行深入研究,研发、改进适用于实际沼气工程高精度、高寿命的监测传感器,推动物联网等技术在实际工程的应用,提高智能化运行效率。并基于对沼气工程监控技术的梳理,结合当下相对成熟的技术,以PLC控制系统为例构建了一套可靠、可行、低成本易于推广的沼气工程智能监控系统,为沼气工程智能化监控技术提供了参考。

摘要：The energy-saving analytics of coal-fired power units in China is confronting new challenges especially with even more complicated system structure, higher working medium parameters, time-dependent varying operation conditions and boundaries such as load rate, coal quality, ambient temperature and humidity. Compared with the traditional optimization of specific operating parameters, the idea of the energy-consumption benchmark state was proposed. The equivalent specific fuel consumption(ESFC) analytics was introduced to determine the energy-consumption benchmark state, with the minimum ESFC under varying operation boundaries. Models for the energy-consumption benchmark state were established, and the endogenous additional specific consumption(ASFC) and exogenous ASFC were calculated. By comparing the benchmark state with the actual state, the energy-saving tempospacial effect can be quantified. As a case study, the energy consumption model of a 1000 MW ultra supercritical power unit was built. The results show that system energy consumption can be mainly reduced by improving the performance of turbine subsystem. This nearly doubles the resultant by improving the boiler system. The energy saving effect of each component increases with the decrease of load and has a greater influence under a lower load rate. The heat and mass transfer process takes priority in energy saving diagnosis of related components and processes. This makes great reference for the design and operation optimization of coal-fired power units.

摘要：Electrohydrostatic actuator（EHA） is a type of power-by-wire actuator that is widely implemented in the aerospace industry for flight control, landing gears, thrust reversers, thrust vector control, and space robots. This paper presents the development and evaluation of positionbased impedance control（PBIC） for an EHA. Impedance control provides the actuator with compliance and facilitates the interaction with the environment. Most impedance control applications utilize electrical or valve-controlled hydraulic actuators, whereas this work realizes impedance control via a compact and efficient EHA. The structures of the EHA and PBIC are firstly introduced. A mathematical model of the actuation system is established, and values of its coefficients are identified by particle swarm optimization. This model facilitates the development of a position controller and the selection of target impedance parameters. A nonlinear proportional-integral position controller is developed for the EHA to achieve the accurate positioning requirement of PBIC. The controller compensates for the adverse effect of stiction, and a position accuracy of 0.08 mm is *** experimental results are presented to verify the applicability of PBIC to the EHA. The compliance of the actuator is demonstrated in an impact test.

摘要：现代工业化发展让包括陕西藤编在内的传统手作面临断代与流失。随着区域民族文化与复合题材时尚的流行,以时尚为载体的跨域衍生为区域民族传统技艺的传承带来机遇。本文从图案、色彩、工艺三个维度挖掘陕西藤编图案与针织产品的跨域触点,通过分析陕西藤编图案的构成形式与用色规律抽取设计因子,借助形状文法匹配针织工艺提出跨域衍生的针织图案设计方法。经方法应用与对比评价实验,陕西藤编跨域衍生针织图案受到了更高的注视时长,为针织图案创新设计与传统技艺文化的可持续发展提供理论方法参考。