Abstract During the regular service life of high‐speed railway (HSR), there might be serious defects in concrete slabs infrastructure systems, which may further significantly affect public transportation safety. To address these issues and fulfill functions HSR, traditional methods for engineers involve carrying out on‐site inspections manually or by semi‐automatic inspection vehicles, conducting timely corresponding repairing approaches maintenance, where are time‐consuming dangerous. In...

This study intends to establish the correlation between charging current under stepwise increased electric field and space charge formation in low density polyethylene (LDPE) LDPE/ZnO nanocomposites. By applying field, distribution were measured as a function of time 10, 30 50 kV/mm, respectively. The results show that homopolar induces increasing with time, while heteropolar decaying excellent suppression is accompanied by constant time. abundant deep trapping states introduced nanofillers...

Abstract Vehicle‐mounted detection methods have been widely applied in the maintenance of high‐speed railways (HSRs), providing feasibility for diagnosing ballastless track arching. However, applying data faces several key limitations: (1) The threshold mostly requires manual setting, making recognition accuracy highly subjective; (2) extensive workload inspections makes it challenging to label data, hindering application supervised learning approaches. To address these problems, this paper...

In this paper, the influence of a drain field plate (FP) on forward blocking characteristics an AlGaN/GaN high electron mobility transistor (HEMT) is investigated. The HEMT with only gate FP optimized, and breakdown voltage VBR saturated at 1085 V for gate—drain spacing LGD ≥ 8 μm. On basis FP, added = 10 For length LDF ≤ 2 μm, almost kept V, showing no degradation. When exceeds decreases obviously as increases. Moreover, larger LDF, decrease VBR. It concluded that distance between edge...

Under high-penetration of renewable energy, power grid is facing with the development problems such as production delay, wind and solar abandoning. With continuous growth energy installation power, photovoltaic (PV), well increase generation capacity, it urgent to peak-load frequency regulation capacity on a large scale alleviate consumption caused by integration, then requires enterprises relevant equipment assets. As result, must carry out scientific cost management This paper introduces...

Health management system is a relatively new formed in recent decades compare to other traditional systems an aircraft. It comprises by onboard part and off board with series of contribute the same health function. Yet it expands rapidly evolution enable technology. Integrated vehicle (IVHM) emerging concept which try integrate former separated related equipment product. For such forming, there good chance apply engineering method defining functions, architecture capture requirements. With...

This paper first gives a brief review of Integrated Vehicle Health Management (IVHM) concept, functions and architecture, then summarizes recent international research development activities in this area especially commercial aviation industry. A clear trend is that IVHM has become focus aerospace All aircraft manufacturers have spent significant amount resources on technology R&D use to improve their products. International standard organizations are also interested by trying form some...

Facing the frequency safety problem of renewable energy power systems, this paper proposes a Frequency Safety Prediction Machine (FSPM) based on one-dimensional convolutional neural network (1D-CNN) and Time-Feature Attention Module (TFAM). To ensure rapidity online prediction (FSP), time series data (1D-TSD) at multiple moments are standardized divided into channels transmitted to FSPM same time, which speeds up speed flow. The TFAM in realizes function focusing key features. Make pay more...

This paper proposes a practical method to identify the parameters in train motion model. Focusing on repeatability of system, new develops an iterative learning identifier estimate through repetitive trials. With rigorous analysis, it is shown that each parameter can effectively converge its actual point after enough iteration. At last, numerical simulation demonstrates validity proposed method.

Due to the popularity of LDPC (Low Density Parity Codes) in modern communication systems, there is a growing need encoder with faster encoding speed and more application compatibility. In this paper, an efficient QC-LDPC architecture proposed, which suitable for both IEEE 802.16e standard 802.11n standard. Owing special structure multi-diagonal parity matrices, inverse matrix replaced back substitution. Simplified RU algorithm applied structure, parallelism determined by row number matrices...

Abstract Adaptive routing algorithms have been widely utilized in Network‐on‐Chip (NoC) architectures and shown to enhance overall throughput numerous studies. The adaptive can effectively detect network congestion. On the one hand, one‐hop awareness or local easily congestion but may also result greed. other global is better for load balancing, it difficult be aware of status. This article proposes a lightweight on‐chip algorithm based on concentric circles theory prior knowledge derived...

Interleave-Division Multiple-Access (IDMA) is an efficient multiple access technique to improve high spectrum efficiency for cellular communications. In this paper IDM-based modulation (called layered (LM)) proposed OFDM systems. The idea of LM multiplex parallel layers data streams by performing repetition and layer-specific interleaver on each layer. Since code bits are fully distributed in time-frequency plane, the aid low-complexity chip-by-chip interference cancellation diversity can be...

This study presents a novel pulse-closing vacuum switch (PCVS) that is used for catenary fault detection and location. First, as the application background of PCVS, principle theory locating system briefly introduced. Then, PCVS analysed designed based on detailed analysis its working process principle. To validate performance multi-physical domain co-simulation numerical model implemented using ANSYS Maxwell Simplorer. Finally, prototype developed with permanent magnet closing repulsive...

To meet the higher data rate requirement of encoder, an encoder structure suitable for both two rates(1/2,2/3B) in WIMAX standard is proposed, combined with method Design Space Exploration.According to quasi cyclic characteristics sparse parity check matrix, traditional RU algorithm simplified and optimized reduce complexity system.Simultaneously we introduce a barrel shifter, use that rows base matrix be restored one ROM resource consumption.The simulation results show rates not only runs...

This paper introduces the development of an effective low cost monitor system to assist normal function and maintenance Overhead Contact System(OCS). The whole contains a remote centre, some local centres lots modules. All communications are through wireless network. also shows how such could be used for OCS monitor, detection items listed. can solve limitations inspection van which is before, it's great significance improve reliability safety high speed electric railway.

The research on how to make a photo-based personalized facial sketch has important scientific significance and practical values. This paper proposes method generate from digital color photo. First, the feature points are automatically extracted through Active Shape Model positions of these recorded; then, style factor can be got stylized samples. Finally, sketches will generated image warping. used in many applications such as caricature.

Volumetric design, also called massing is the first and critical step in professional building design which sequential nature. As volumetric process complex, underlying encodes valuable information for designers. Many efforts have been made to automatically generate reasonable designs, but quality of generated solutions varies, evaluating a solution requires either prohibitively comprehensive set metrics or expensive human expertise. While previous approaches focused on learning only final...