摘要：Nanomaterials have garnered recognition for their notable surface effects and demonstration of superior mechanical *** studies on the surface effects of nanomaterials,employing the finite element method,often relied on simplified twodimensional models due to theoretical ***,these simplified models inadequately represent the mechanical properties of nanomaterials and fail to capture the substantial impact of surface effects,particularly the curvature dependence of *** study applies the principle of minimum energy and leverages the Steigmann-Ogden surface theory of nanomaterials to formulate a novel finite element surface element that comprehensively accounts for surface *** conducted an analysis of the stress distribution and deformation characteristics of four typical 2D and 3D nanomaterial *** accuracy of the developed surface element and finite element calculation method was verified through comparison with established *** resulting finite element model provides a robust and compelling scientific approach for accurately predicting the mechanical performance of nanomaterials.

摘要：Distributed dynamic absorbers have many advantages such as wide frequency bandwidth for vibration suppression,strong detuning adaptability,and high system stability,making them very suitable for the vibration and noise control of continuous ***,they have broad application prospects in various fields such as transportation,aviation,and ***,there are still many challenges in the engineering applications of distributed dynamic absorbers for vibration suppression,including the engineering realization of the optimal damping of traditional optimal coherence dynamic absorbers,and the engineering applicability of the finite periodic array dynamic *** on the damping material properties obtained by the dynamic mechanical analyzer tests,this paper establishes the finite element model of the cantilever-beam-type dynamic absorber with constrained damping layers,aiming to realize the accurate determination of the optimal *** are conducted by attaching the traditional dynamic absorbers with the optimal damping to a thin-walled panel with four clamped *** show that the vibration of the panel is well suppressed,with the reduction of the frequency response peak larger than 14 dB and the reduction ratio of RMS larger than 58%within 500 ***,the periodically arrayed dynamic absorbers are designed according to the bandgap regulation *** tuning behavior of the arrayed dynamic absorbers by changing designing parameters is *** vibration reduction effect of arrayed dynamic absorbers is compared with that of the traditional dynamic absorbers under the same mass ratio through *** indicate that the arrayed dynamic absorbers are easier to design,and have a similar reduction effect on the modal vibration of the thin panel as the traditional dynamic absorbers within a narrow frequency range near the natural frequency,while they perform unsatisfactory in a broad ***,if t

摘要：Video adaptation is a promising technique to bridge the gap between network status, device capabilities, and user preferences in pervasive media applications. However, conventional adaptation frameworks based on either transcoding or multiple pre-transcoding are not able to accommodate large numbers of users with diversified applications. This paper introduces an intermediate video description called ＂Inter- media＂, which consists of multiple level video signal components, such as texture, motion, and rate control information, as well as some semantic features, such as structural characteristics and Region Of Interest （ROI） information. It is generated off-line and stored in the video server or media gateway. Intermedia is then used to design a novel video adaptation system. The proposed adaptation system quickly and easily generates the required bit stream from Intermedia with very low complexity to fulfill a series of specific adaptation requirements, e.g., bitrate conversion, temporal/spatial resolution reduction, video summarization, ROI browsing, and some multi-level adaptations involving both signal level and semantic level adaptation. The satisfactory performance of such a system demonstrates the effectiveness and efficiency of the proposed video adaptation framework.

摘要：The ubiquitous power Internet of Things(UPIoT)is an intelligent service system with comprehensive state perception,efficient processing,and flexible application of *** focuses on each link of the power system and makes full use of the mobile internet,artificial intelligence,and other advanced information and communication technologies in order to realize the inter-human interaction of all things in all links of the power *** article systematically presents to the national and international organizations and agencies in charge of UPIoT layer standardization the status quo of the research on the Internet of Things(IoT)-related industry standards *** briefly describes the generic standard classification methods,layered architecture,conceptual model,and system tables in the UPIoT application *** on the principles of inheritance,innovation,and practicability,this study divides the application layer into customer service,power grid operation,integrated energy,and enterprise operation,emerging business and analyzes the standard requirements of these five *** study also proposes a standard ***,it summarizes the research report and provides suggestions for a follow-up work.

摘要：Gas sensors have received extensive attention because of the gas pollution caused by rapid construction of urbanization and *** sensors based on semiconductor metal oxide(SMO)have the advantages of high response,excellent repeatability,stability,and cost-effectiveness,and have become extremely important components in the gas sensor *** with regular structures and controllable morphology exhibit more consistent and repeatable ***,during the process of material synthesis,because of the uncontrollability of the microcosm,nanomaterials often show irregularities,unevenness,and other ***,the synthesis of gas sensors with well-aligned one-dimensional(1D)structures,two-dimensional(2D)layered structures,and three-dimensional(3D)hierarchical structures has received extensive *** obtain regular structured nanomaterials with desired morphologies and dimensions,a template-assisted synthesis method with low cost and controllable process seems a very efficient *** this review,we introduce the morphology and performance of SMO sensors with 1D,2D,and 3D structures,discuss the impact of a variety of morphologies on gas sensor performance(response and stability),and shed new light on the synthesis of gas sensing materials with stable structure and excellent performance.

摘要：A compacted and low-offset low-power CMOS am- plifier for biosensor application is presented in this paper. It includes a low offset Op-Amp and a high precision current reference. With a novel continuous-time DC offset rejection scheme, the IC achieves lower offset voltage and lower power consumption compared to previous designs. This configuration rejects large DC offset and drift that exist at the skin-electrode interface without the need of external components. The proposed amplifier has been implemented in SMIC 0.18-μm 1P6M CMOS technol-ogy, with an active silicon area of 100 μm by 120 μm. The back-annotated simulation results demonstrated the circuit features the systematic offset voltage less than 80 μV, the offset drift about 0.27 μV/℃ for temperature ranging from –30℃ to 100℃ and the total power dissipation consumed as low as 37.8 μW from a 1.8 V single supply. It dedicated to monitor low amplitude biomedical signals recording.

摘要：进入数字时代,数字技术与传统学科的融合正在不断创新研究方法和拓宽研究边界。其中,数据处理、计算分析等数字技术与艺术史的结合开辟了数字艺术史这一新领域。在研究实践中,数字艺术史研究策略不仅提高了研究效率,还通过建构关系网络等方式变“静态艺术史”为“动态艺术史”,为艺术史研究提供了新的视角。当然,数字艺术史也面临图像标注的主观性、数据信息的误差等挑战。总体看来,数字艺术史需要保持批判性思维,避免唯数据论,不断优化研究策略,坚持跨学科视野,优化数据的质量、来源和处理方法等,加强技术与艺术之间的合作,为艺术史研究注入新的活力。

摘要：由于从小在民间艺术构建的大环境中成长,张道一对民间艺术由兴趣始发,进而对众多民间艺术门类进行"尝尝味道"的创作实践。不仅如此,张道一自1953年随陈之佛学习就开始了真正的理论学习,不仅对多项民间艺术展开田野调查、收集归类等相关活动,而且对民间艺术进行专题研究,张道一称它为"攥米团子"。张道一对艺术学进行宏观规划的同时,亲自打造艺术学的理论基石,身体力行,将散落于历史洪流和地域角落里的民间艺术搜集挖掘出来进行具体分析研究,一个个精美好看又香甜美味的"米团子"就这样呈现在我们的眼前。

摘要：Hydrogen sulphide(H2 S)is a common air pollutant,which is produced in various industry ***,it is of crucial importance to detect H2 S in real *** fluorescent sensors were reported aiming at detecting H2 S in solution;however,the fluorescence sensing of gaseous H2 S has not yet been *** this work,we utilized the post-functionalized fluorescent film,MIL-100(In)@Eu3+/Cu2+film,realizing fluorescence turn-on sensing of gaseous H2 S at room temperature for the first time with the limit of detection as low as 0.535 ppm,which is comparable to some reported fluorescent probes for S2-ions and semiconductor based gaseous H2 S *** sensor was designed due to the strong affinity of H2 S with Cu2+.With the formation of CuS,the"antenna effect"between the ligand and Eu3+recovered,resulting in the fluorescence turn-on of Eu3+***,we proposed a new method to realize multi-colour anti-counterfeiting patterns with lanthanide ions ink,taking advantage of the extraordinary smooth surface and uncoordinated carboxylate groups within the MIL-100(In)film.

摘要：A screw drive in-pipe robot is promising inspection equipment for small pipes. However, most of the existing screw drive in-pipe robots have problems of motion interference and slipping inside curved or irregular pipes. These problems result from the coupled relations among the steering motion, the motion speed and the load ability of the robot. In order to deal with the problems, the axiomatic design （AD） theory is applied to evaluate and analyze the existing designs. Then an uncoupled con- cept design based on the AD theory is proposed and the complete AD decomposition process is presented. After that, the pro- posed robot based on a tri-axial differential angle modulation mechanism is designed to realize the uncoupled concept. Finally, the uncoupled property is verified in a dynamics simulation system. The simulation results indicate that the mc tion speed, load ability and steering motion of the proposed robot can be adjusted individually compared with the robots taat have inclin- ing-angle-fixed rollers. Owing to the uncoupled design, the proposed robot can mechanically adapt to straight pipes and curved pipes with less roller slipping.