摘要：In this study, we developed a multi-channel lownoise electronic readout system for a silicon strip *** two charge-sensitive amplifier VA140 chips from IDEAS in Norway, the system has a wide linear dynamic input range of up to 180 fC for 128 channels with 0.16 fC average equivalent noise charge. In addition, we studied the charge distribution behaviors between adjacent silicon strips with the help of transient current technology.

摘要：Biophysical restrictions regulate protein diffusion,nucleus deformation,and cell migration,which are all universal and important processes for cells to perform their biological ***,current technologies addressing these multiscale questions are extremely ***,through two-photon polymerization(TPP),we present the precise,low-cost,and multiscale microstructures(micro-fences)as a versatile investigating *** nanometer-scale printing resolution and multiscale scanning capacity,TPP is capable of generating micro-fences with sizes of 0.5-1000μ*** micro-fences are utilized as biophysical restrictions to determine the fluidity of supported lipid bilayers(SLB),to investigate the restricted diffusion of Src family kinase protein Lck on SLB,and also to reveal the mechanical bending of cell nucleus and T cell climbing *** together,the proposed versatile and low-cost micro-fences have great potential in probing the restricted dynamics of molecules,organelles,and cells to understand the basics of physical biology.

摘要：We propose a medium access control(MAC) protocol for uplink transmissions in wireless local area networks(WLANs),where both stations and access points(APs) are equipped with multiple antennas. The protocol solves some common problems in utilizing multiple input multiple output(MIMO) under the 802.11 protocol,e.g.,how to deploy preamble(training sequence) used for channel estimation and how to enable simultaneous data transmissions,and facilitates two simultaneous uplink data transmissions via a cross-layer approach. Furthermore,we develop a 3D discrete-time Markov model to analyze the per-formance of the proposed WLAN scheme. The analytical results are verified by simulation,and numerical results show that the system throughput can be significantly improved by our proposed scheme as compared with conventional schemes.

摘要：Guidance problems with flight time constraints are considered in this article. A new virtual leader scheme is used for design of guidance laws with time constraints. The core idea of this scheme is to adopt a virtual leader for real missiles to convert a guidance problem with time constraints to a nonlinear tracking problem,thereby making it possible to settle the problem with a variety of control methods. A novel time-constrained guidance （TCG） law, which can control the flight time of missiles to a prescribed time,is designed by using the virtual leader scheme and stability method. The TCG law is a combination of the well-known proportional navigation guidance（PNG） law and the feedback of flight time error. What＇ s more, this law is free of singularities and hence yields better performances in comparison with optimal guidance laws with time constraints. Nonlinear simulations demonstrate the effectiveness of the proposed law.

摘要：Calculating the flow coefficient of a spool-valve is complicated due to the coupling–throttling effect in the throttling grooves of a proportional–directional *** this paper,a methodology for expressing the flow coefficient of coupled throttling grooves is proposed to resolve that *** this purpose,an approach of a 3 D numerical simulation and an experimental bench were introduced based on the prototype of a commercial proportional *** results show consistency between the numerical simulation and the bench *** on that,the concept of‘saturation limit’is introduced to describe the value gap between the current and saturated flows,so that the flow-coefficient saturation limit of the prototype in the process can be ***,an approximate flow coefficient suitable for coupled throttling grooves within finite variable space,which is based on three typical throttling structures(i.e.O-shape,U-shape,and C-shape)of the coupled throttling grooves,is obtained based on an orthogonal *** model results are consistent with the numerical and experimental results,with maximum errors of less than 5.29%and 5.34%,*** suggests that the proposed method is effective in approximating the flow coefficient.

摘要：Catalysts play decisive roles in determining the energy conversion efficiencies of energy *** to now,various types of nanostructured materials have been studied as advanced *** review highlights the application of one‐dimensional(1D)metal electrocatalysts in energy conversion,focusing on two important reaction systems-direct methanol fuel cells and water *** this review,we first give a broad introduction of electrochemical energy *** the second section,we summarize the recent significant advances in the area of 1D metal nanostructured electrocatalysts for the electrochemical reactions involved in fuel cells and water splitting systems,including the oxygen reduction reaction,methanol oxidation reaction,hydrogen evolution reaction,and oxygen evolution ***,based on the current studies on 1D nanostructures for energy electrocatalysis,we present a brief outlook on the research trend in 1D nanoelectrocatalysts for the two clean electrochemical energy conversion systems mentioned above.

摘要：This study focused on differences in vehicle-to-vehicle radio channel character- istics in the same region but different traffic density and speeds at 5.9 GHz （congestion and non-congestion）. The continuous measurement campaign was conducted on a city expressway through the complex dense urban area in Wu- hart, China. Small-scale channel characteris- tics including power delay profile, amplitude fading distribution, K-factor, delay spread and Doppler shift were obtained, respectively. Spe- cifically, the cumulative distribution function of root mean square delay spreads and root mean square Doppler spreads in the non-con- gested scenario and congested scenario were all fitted well with Lognormal distribution. We also found out that different intensity of traffic and speed of vehicles have little effect on root mean square delay spreads, but have a big im- pact on root mean square Doppler spreads and level crossing rate. According to estimation outcomes, the V2V channel characteristics for urban areas in Chinese big city were differ- ent from the previous measured results under similar scenarios in Europe. Delay spread and level crossing rate in this study can provide significant references to design the wireless communication system for vehicle-to-vehicle channel.

摘要：We successfully designed and fabricated TES bolometers utilizing Al/Ti bilayer TESs as sensitive *** reduce the intrinsic noise level and tune the saturation power of a bolometer,the TES thermometer is placed on a suspended SiN platform which is thermally coupled to the heat bath by four long SiN beams with different *** measurement results show that the detectors have background limited noise performance,with a low noise equivalent power(NEP)on the order of10-17W/Hz1/2and have a saturation power of several tens pW at a bath temperature of 320 *** detectors are suitable for applications in ground-based astrophysics experiments by integrating absorbers for specific wavelengths.

摘要："二次元"作为源于日本的一种文化形式,随着大众传播媒介的介入,由此也带来了动漫衍生品的迅速发展,但国内"二次元"IP与服装的设计合作尚未形成成熟的运作机制,市场空间较大。"少女角色"在"二次元"文化中具有重要的研究价值,"少女文化"研究先驱本田(Honda)将这种"少女"美学视为独立和自由的信号,它是一个女孩想象力的浪漫极限空间,女孩可以将自己从理性、实用性和逻辑性的"男性化"世界中抽离出来,从而获得自由感、能动性。文章通过文本分析、问卷调研、专家访谈等方法了解"二次元少女角色"IP服装的消费者认知现状及市场接受度;并运用AHP层次分析法对其设计要素进行权重优序分析,探索该IP应用于服装设计领域的最优解决方向,既为品牌和设计师提供产品设计研发思路,丰富服装产品的创作灵感素材;同时为动漫IP衍生品的设计提供一定的借鉴意义。

摘要：2024年,无人机技术正以智能化、自主化和系统化为核心驱动力,深刻重塑着低空经济与智能空域的全球格局。从无人机自主飞行与智能控制、无人机集群协同、无人机集群验证、反无人机技术及无人机管控与低空经济等多个维度,系统阐述了无人机相关技术2024年的代表性进展、技术挑战与发展趋势。当今,无人机技术正通过跨领域的技术集成和智能生态构建,从单一工具化应用跃升为系统级战略支柱,而低空经济的快速扩张对全球空域治理、多模态感知、任务优化以及安全保障提出了新的要求。未来的无人机必将以智能空域治理为基石、以协同创新为引擎、以新质能力提升为目标,打造面向未来场景应用的无人机生态新体系,为低空经济高质量发展、智能空域全球布局及多领域纵深应用提供技术支撑与行业引领。