In this study, a preparation method for the high-temperature pressure sensor based on piezoresistive effect of p-type SiC is presented. The varistor with positive trapezoidal shape was designed and etched innovatively to improve contact stability between metal varistor. Additionally, excellent ohmic formed by annealing at 950 °C Ni/Al/Ni/Au doping concentration 1018cm−3. aging tested varistors in air 25 °C–600 °C. resistance value initially decreased then increased increase temperature...

An excellent flame suppression effect can be achieved using a novel porous brake. To understand the flame-suppression mechanism of brake, combustion muzzle brake is investigated. A set internal ballistic equations employed to provide accurate velocity and pressure for projectile moving muzzle. The multispecies transport Navier–Stokes equations, which incorporate complex chemical reactions, are solved by coupling real gas equation state, Soave–Redlich–Kwong model, detailed reaction kinetic...

In this paper, the atomic model of high-entropy alloy is established by molecular dynamics simulation. By applying nano-indentation, influence Cu ratio and temperature on deformation FeCoCrCuNi was studied, micro-scale dislocation movement evolution mechanism obtained. The results show that, with increase temperature, load under nano indentation decreases. total length dislocations in each stage nanoindentation decreases monotonically, types reactions decrease. Under action high number...

A complex signal processing technique is usually required to process the data in most sensor design structures, and integration into real applications also challenging. This work presents a dynamic rotational using polymethyl methacrylate (PMMA) fiber for robot movement assessment. The structure based on coupling of light intensity, which two PMMA fibers are twisted together. Both bent after twisting attached linear translation stage, further robot. variation bending radius causes loss, that...

The performance of time-critical systems depends heavily on time synchronization accuracy. Therefore, it is crucial to have a method that can achieve high In this paper, we propose new underlying transmission architecture and messages. On the basis these, aiming at error problem slave clock, an enhanced based Furthermore, evaluate OMNeT++ simulator. addition, compare impact different crystal oscillator accuracies frequencies accuracy, respectively. Simulation results show offset most ±1...

In this work, the piezoresistive properties of heavily doped p-type 4H-SiC at room temperature were investigated innovatively. It was verified by a field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), and laser Raman spectroscopy (LRS) that crystal quality epitaxial layer good. The doping concentration thickness measured secondary ion mass spectrometry (SIMS) to be ~1.12 × 1019 cm-3 ~1.1 µm, respectively. cantilever beam along [ 1 - 00 ] orientation fabricated, fixed...

In order to reduce the x-direction and Y-direction displacement disturbance of barrel improve firing accuracy, based on Bernoulli Euler’s theoretical assumption beam taking M134 machine gun as calculation model, pre-stress modal analysis optimization cantilever supported rotor under unbalanced force moving mass are carried out in this paper. The main work paper is follows: (1) physical model established, motion process projectile bore solved by interior ballistic theory; (2) Based theory,...

This study aims to understand cloud growth behavior and enhance safety reliability by investigating the design of dispersal devices. Based on experimental results simulation results, this analyzes dispersion characteristics materials within a frustoconical device with semi-cone angle ranging from 0° 10° across multiple scales. The collision aggregation model for particles multi-scale coupling mechanism are established. research shows that extends effective duration enlarges macroscopic size....

The artillery firing process will instantly produce high-temperature and high-pressure gunpowder gas, this shock waves. gas has a limited effect on the projectile during ballistic after-effects period, however, it very obvious stability of gun body, reduction body directly affects accuracy safety personnel. Based method Computational Fluid Dynamics (CFD), numerical simulation is carried out, structure flow parameters muzzle field are obtained by using three-dimensional Euler's control...

Abstract Fine‐grained Fe−Al energetic materials have high reaction enthalpies, and the release energy of iron phase a large portion active aluminium in sintered enables replacement conventional new types weapons. To study characteristics fine‐grained jets under impact loading, dynamic acquisition system is established to quantify generated by response targets. The pressure‐time curves with different ratios conditions are obtained, method for calculating pressure differential value proposed...

Crash simulation systems in laboratory are widely used the development of components or protect against crash pulse. Based on a rod control hydraulic engery absorber, paper describes new simulator providing repeatable important parameters automobile deceleration pulses during condition. The mathematic models absorber and design method were presented also .According to replaced different variable diameter is simple easy simulate including total velocity acceleration effect was tested verified...

Resource scheduling based on SLA (Service Level Agreement) in cloud computing is NP-hard problem.There no efficient method to solve it.This paper proposes an optimal model for the problem and gives a solution by applying stochastic integer programming technique.Applying Gröbner bases theory solving experimental results of implementation are also presented.

The energy released by the active metal phase in fine-grained Fe/Al energetic materials enables replacement of conventional new types weapons. This paper describes an experiment designed to study energy-release characteristics jets under impact loading. By means dynamic mechanical properties analysis, physical and chemical with specific content are studied, preparation process is determined. subject different conditions studied based on experimental data, differences discussed. results show...

Fe–Al energetic material releases a large amount of energy under impact loading; therefore, it can replace traditional materials and be used in new weapons. This paper introduces the macroscopic experiment microscopic molecular-dynamics simulation research on release characteristics jets loading. A dynamic acquisition test system was established to quantitatively obtain composition jet reaction products. momentum mirror impacting particle molecular model microstructure evolution...