Fog seal technology has the advantages of convenient construction and rapid opening traffic, it a broad application prospect in maintenance airport asphalt pavement. However, current evaluation indices fog materials are not relevant enough to reflect their performance strengths weaknesses comprehensively systematically. Moreover, there is lack research on non-emulsification class materials. This aims compare contrast various types for pavement provide suggestions optimizing achieve better...

The Dualfoil model is used to simulate the electrochemical behavior and temperature rise for MCMB/LiCoO 2 Li-ion cells under constant-resistance load operation, approaching a short-circuit condition. Electrolyte solid surface concentration profiles of lithium-ion across cell at various time scales are developed analyzed explain transport limitations. Sensitivity simulative tests conducted using selected values heat-transfer coefficient, diffusion coefficient in solution phases, electrode...

One of the main methods for link quality prediction is to predict physical layer parameters first, and then evaluate based on mapping models between such packet reception ratio (PRR). However, existing often ignore temporal correlations parameter series rarely consider influence fluctuations, which lead more errors under moderate sudden changed links with larger fluctuations. In view these problems, this paper proposes a effective method RNN-LQI, adopts Recurrent Neural Network (RNN) Link...

With the increase of capacity photovoltaic (PV) systems, how to alleviate problem caused by random output power PV system becomes significant. This paper uses Markov model correct prediction results generation for grid-connected based on gray neural network model. Using hourly data under similar climate conditions, is established in real-time. Then, model, temperature, irradiance and measured values are used build with network, residual corrected chain. The accuracy researched three typical...

Multichannel communication has great potential in environments with unknown interference patterns. However, existing link quality metrics and models are generally established verified under a single-channel scenario, which does not consider the impacts of radio channel change. Therefore, it is hard to directly judge whether these still valid multichannel scenario. This paper empirically analyzes applicability popular multiple channels different levels. Results show that estimation (LQE)...

Fog seal technology is widely used in airport asphalt pavement. The research on the performance and application of fog material basically at level modified emulsified asphalt. test method existing specification has defects. Three kinds materials with different substrates were selected this paper. Based characteristics treatment relevant specifications Wet Track Abrasion Test (WTAT), Cantabro test, Water seepage Pendulum instrument tester pavement friction coefficient improved. types seals....

Accurate state-of-charge (SOC) estimation is essential for maximizing the lifetime of battery-powered wireless sensor networks (WSNs). Lightweight methods are widely used in WSNs due to their low measurement and computation requirements. However, accuracy existing lightweight not high, adaptability different batteries working conditions relatively poor. This paper proposes a SOC method, which applies Peukert's Law estimate effective capacity battery then calculates by subtracting cumulative...

This paper investigates the modeling and decoupling control of grid-connected voltage source inverter (GC-VSI) for wind energy conversion system (WECS) applications. Firstly, typical configuration operation principle direct-driven WECS are analyzed. Then, by means input-output method instantaneous active power theory, a time domain mathematical model GC-VSI is set up. Besides, in order to resolve current reactive cross-coupling nonlinear problem, vector firing pulse generation deduced dq...

In order to eliminate the chattering phenomena caused by conventional sliding mode control (SMC) method in magnetic bearing system control, this paper proposes a variable rate reaching law approach based controller achieve higher stability and robustness. law, states’ normal numbers are brought automatic adjust gain of switching part SMC. The output amplitude can be progressively damped, will converge zero asymptotically. is proved Laypunov theory, prerequisite parameters design deduced out....

Previous studies have shown that some inflammatory cytokines are associated with dentofacial anomalies (DA), but the causal relationship is unclear. Therefore, present study aimed to elucidate between circulating cytokines, and DA risk by Mendelian randomization analysis.

Thin-layer covers easily crack under traffic load, shortening their service life. Incorporating fiber materials into the mix can enhance resistance thanks to abundance, affordability, and flexibility. However, different types of fibers have performances in bitumen mixtures due material properties. To explore this problem, basalt fiber, polypropylene glass were selected paper. The surface characteristics, internal structure, adsorption capacity oily substances observed via scanning electron...

A new outdoor photovoltaic (PV) module test platform was introduced to measure I–V characteristic curve of PV in this study. The proposed designed centring on the programmable electronic load (E-load) which used transfer characteristics metal–oxide–semiconductor field-effect transistor (MOSFET) and controlled output current by controlling drain ID MOSFET indirectly. Ultimately, work any operating point curve. This can automatically shift operation mode contraposing module. It continuously...

The size of time windows used by low-power wireless protocols to compute packet reception ratio (PRR) directly affects the accuracy and agility link quality prediction. Using small would make prediction more agile, but its decreases seriously. To improve while maintaining agility, many existing methods generally predict physical layer parameters within first then calculate PRR using mapping models such PRR. However, due propagation characteristics signal, these usually introduce large...

Low power wireless links are prone to fluctuate when the channel environment changes. In order reduce impact of link fluctuations on data transmission, it is necessary predict quality quickly and accurately make dynamic adjustments according prediction results. However, existing mechanisms lack sufficient consideration fluctuations, which leads high errors under with large such as moderate sudden changed links. response this problem, paper proposed WNN-LQP, a more effective mechanism...

Vertical axis wind turbine (VAWT) plays one of the important roles in power equipments. When joining magnetic levitation technology, VAWTs can effectively reduce friction torque to improve startup performance and increase coefficient. At same time, mechanical vibration be reduced, its actual functioning time extended. In this paper, structure, working principle mathematical model were introduced respectively with an intention present supporting structure a VAWT. Then self adaptive...

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In the fields of numerical control machine, robot etc, vector system permanent magnet synchronous motor (PMSM) has widely application prospects. Proportion integration (PI) adjustment block, coordinate transformation space pulse width module (SVPWM) block and simulation model whole are built in MATLAB/SIMULINK according to mathematical model, SVPWM technique theory PMSM. The results show that stator winding triphase current can run smoothly, speed output torque be accurately follow given...

This paper introduced the working principle of magnetic levitation rail machine and carried out analysis. Take weight 132N simulation workbench prototype for example, finite element analysis electromagnetic fields is applied through ANSYS software to find variation law field distribution affecting factors. Analysis shows that has small leakage field, high load capacity large anti-external disturbances if parallelism straightness are no more than 0.1mm 0.2mm respectively when table suspended...

To research the performance of hybrid excited doubly salient motor (HEDS) driven system, a HEDS mathematical model is derived and simulation system built by Simulink/PSB environment. According to principal its control strategies, several simulations under different operating modes are modeled. The results show that, higher torque at low speed, wide speed range in constant power operation. consistent with theoretical analysis; it shows that method validity effectiveness.