Abstract Based on the irresistible inherent trade‐off between mechanical and self‐healing performances of cross‐linked polyurethane materials, there is still an intractable challenge to design efficient tough elastomers, especially in flexible sensors. Herein, a tough, self‐healing, recyclable elastomer (DTPU) was prepared by integrating oxime‐carbamate bonds thiourethane into network. The extraordinary properties DTPU elastomers were related synergistic effect main chain chemical sites....

The principal accuracy limitation of a hydrogen maser is the uncertainty in determination wail shift. In this paper, we describe detail experiments on wall shift and introduce briefly works masers Shanghai Bureau Metrology. experiments, changed five different size storage bulbs by. turns. These were all coated same way with locally made F4 coating. Results are K(40°C) = -293 ± 17 mHzcm a(40°C) (-17 2) × 10-30C-1. unperturbed hyperfine frequency ground state atomf0-0 was obtained by comparing...

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The effects of steel fiber volume rate and concrete thickness on the crack development resistance basalt reinforced polymer (BFRP) beams were investigated by flexural tests six partially BFRP beams. results showed that addition fibers effectively limited extension height initial expansion after cracking, difference in between partial test beam full-section was small. For with fibers, maximum width can be suppressed under ultimate load. Its arresting effect is more similar to bars; it shows...

To effectively prevent heavy metal pollution in water sources tourist attractions, clarify the degree of control sources, and improve accuracy tracing results, a GIS-based remote sensing method attractions is proposed. Using GIS spatial analysis method, DEM elevation data monitored by obtained, watershed geographic information compiled, GPS obtains longitude latitude coordinates to locate source pollution. The plug-in application framework designed, are integrated build platform. According...

In China, Three oil companies use all sorts of beam pumping units, but the operation balancing adjustment is labor-intensive, low efficiency and accuracy in general. Many engineers try to improve these, so they design various kinds devices adjust balance however, intelligent level most installation maintenance complicated security not high. this design, unit technology for theoretical support, combined with mechanical electrical system, an device designed. The experiment shows that after...

The wave propagation in plate covered by periodic damping layers is analyzed and controlled. A theoretical model developed to describe the characteristics vibrations of a structures with simply supported boundary condition along its longitudinal edges. are estimated analyzing transfer matrix each cell resulting structure. numerical used predict dynamic response plates study their attenuation for various configurations. presented results demonstrate simplicity effectiveness proposed...

Topological insulator is a new material with unique quantum mechanical properties, which insulating in the bulk energy state and metallic surface state. It can realize high-speed transport of electrons without consumption, it has good application prospect electronics. In this paper, quantitative qualitative method based on different data analysis models used to for topological analysis. Firstly, multi-source heterogeneous mine analyze from varied dimensional data. The analyzed elements are...

Large language models demonstrate impressive performance on downstream tasks, yet requiring extensive resource consumption when fully fine-tuning all parameters. To mitigate this, Parameter Efficient Fine-Tuning (PEFT) strategies, such as LoRA, have been developed. In this paper, we delve into the concept of task-specific directions--critical for transitioning large from pre-trained states to enhancements in PEFT. We propose a framework clearly define these directions and explore their...

An efficient demodulation method designed for FMCW (Frequency‐Modulated Continuous Wave) radar is presented. It a kind of modified DFT (IDFT) algorithm; the spectrum segment interest can be easily extracted from original signal without calculating whole DFT/FFT. provides fast and extraction desired frequency bands in our HFSWR (High‐Frequency Surface Wave Radar) system. The proposed approach enhances performances system reduces computing complexity. new structure could also inversely used...

The lack of modular technology and framework makes it infeasible for traditional Java-based Web applications to develop in a modular-based way. integration OSGi (open service gateway initiative) Java application provides an approach the development J2EE presentation layer, but cater layer enterprise-level (such as reconfigurable RFID middleware), also requires that can collaborate with frameworks at all levels. paper begins analysis runtime environment OSGi-based applications, which...

The catalytic combustion of methane over a single pellet catalyst different structures was modeled by two-dimensional numerical simulations. same boundary conditions as wall methods were selected to compare the properties in catalysts and efficiency gas flow. results indicate that egg-shell type is suitable for fast it can improve utilizing especially noble metal catalyst. For situations where active section prone be poisoned or lost weight will happen, egg-white egg-yolk recommended reason...

A theoretical model for calculating sound transmission loss (STL) of finite honeycomb sandwich panels is developed. The accuracy the predictions checked against experimental data, with good agreement achieved. Numerical analysis shows that increasing face sheet thickness can improve STL effectively, which much more effective than core thickness. Core and Youngs modulus have evident effect on coincidence frequency, should not be neglected when predicting STL.

The network services present diversity as the continuous evolution of communication scenarios, which brings a great challenge to efficient utilization resources.The ALOHA access mechanism is considered an effective solution deal with multi for its feature shared bandwidth.However, collision problem degrades quality service (QoS) seriously.The packet reception (MPR) technology could mitigate and improve performance.Considering MPR capability, we propose novel random scheme aggregate traffic...

A simple approach to reduce the governing equations for thick honeycomb sandwich panels a single equation containing only one displacement function is proposed in this article. The variational of motion are derived using Hamilton’s principle and by introducing differential operators. exact solution natural frequencies rectangular with all edges simply-supported obtained leading satisfied agreement theoretical results. influence ratio core thickness face sheet aspect on studied. analysis...

Electric barrier, which is one of the most vital function in GPS auto monitor system demands, has being widely applied many fields liking bike sharing.This paper presents an intelligent and describes design implement electric barrier on a Shared bike.By means map matching method to realize parking cycle designated area, it more effective use sharing facilitate travel mass people.On vehicle monitoring map, draw polygons electronic fence, when area meet appropriate conditions, can alarm or do...

In thermodynamics of irreversible processes, the entropy production rate (EPR) is usually generated by change system due to its internal transitions and flows interactions between environment. For bipartite system, in addition factors mentioned above, energy information exchanges two subsystems will generate an additional EPR a subsystem. To reveal essence role flow, we build open dissipative quantum coupled multiple electronic reservoirs with same temperature different chemical potentials....

The paper presents the design methods of HF radar receiver for short-range Ocean State Measuring and Analyzing. system adopts Frequency Modulated Interrupted Continuous Waveform (FMICW) operates at 12∼14MHz. has only once mixing band-pass sampling structure. After data, a new DDC (Digital Down Converter) algorithm is used during demodulation. It modified algorithm, in which no filter used. uses cross-loops/monopole as receiving antenna, signals are generated by DDS chips. structure quite...