Abstract In this paper, we apply a reliable combination of maximum modulus method with respect to the Schrödinger operator and Phragmén–Lindelöf investigate nonlinear conservation laws for boundary value problems second order. As an application, prove global existence solution Cauchy problem semilinear equation. The results reveal that is effective simple.

A three-dimensional computational model of two CRH2 trains passing by each other in a tunnel was developed using finite volume method with moving mesh, to investigate the characteristics air wave and flow field around high-speed trains. Two meeting scenarios (i.e. at same train speeds different speeds) five 200, 250, 300, 350, 400 km/h) were examined. The is demonstrated be qualified for tunnel. pressure distribution velocity vectors revealed, typical features corresponding curve discussed....

In this paper, finite-time consensus of double-integrator multi-agent systems is investigated. A new adaptive-terminal sliding mode control proposed to satisfy the goal within a finite time by considering disturbances and input saturation. The problem solved for two cases. first case, agents are subjected with known upper bounds saturation parameters. For inputs designed based on terminal technique achieve aim as summation settling reaching times. Then, fast applied modified reduce high...

Abstract The use of compact engines reduces the distance between combustor and turbine, leading to interaction remaining inhomogeneous swirling flow at outlet with mainstream turbine vane cascade. Consequently, previous cooling designs may struggle meet requirements for inflow conditions. This study aims investigate impact on full-film guide vanes. film effectiveness (η) vanes under two conditions three mass ratios was measured using pressure-sensitive paint technique. cylindrical holes...

Diabetic striatopathy (DS) is a rare disorder characterized by clinical manifestations of hemichorea, non-ketotic hyperglycemia, and high signal on T1-weighted MRI or density CT scan in basal ganglia, typically associated with poor glycemic control.

This paper presents a photoelectric detection circuit for microfluidics chip. The proposed system can reduce noise and increase sensitivity. It is consist of pre-amplifier, ac-amplifier band-pass filter. transfer function introduced. implementations simulation results are given. suitable integrated

This paper presents the design of low noise CMOS pre-amplifiers based on photoelectric detection systems, which can directly affect detecting precision whole systems. The pre-amplifier circuit from detector was introduced. conversion circuit, amplifier bandwidth, noise, stabilization and other questions were mainly discussed, an capable effectively decreasing temperature drift a large dynamic range designed. analyzes sources internal gives formulas designs variable equivalent load is...

In this paper, the statistical characteristics of multi-cascade κ-μ shadowed fading channels are investigated and analyzed under classic Wyner’s eavesdropping model. particular, general accurate expressions probability density function cumulative distribution for amplitude signal-to-noise ratio (SNR) derived first time. Moreover, we further utilize two performance evaluation metrics including outage intercept to investigate impacts cascade number channel parameters on reliability security....

This paper deals with a large flywheel magnetic bearing system. A simple rigid model was derived based on overlapping principle. servo system backstepping controller taking into consideration of the gyroscopic effect designed. The switching method for control current chosen to avoid use bias current. Through simulation and experiments, effectiveness stability verified. Meanwhile, power consumption using proposed is reduced by half compared control. Faced problem that rotor cannot overcome...

This paper presents a design and analysis method of bandgap reference circuit. The Bandgap is realized through the 0.18um CMOS process. Simulation results show that circuit outputs 1.239V in typical operation condition. variance rate output voltage 0.016mV/°C? with operating temperature varying from-60°C? to 160°C?. And it 3.27mV/V power supply changes from 1.8V 3.3V.

A novel CMOS interface circuit with high resolution is designed and realized to achieve the integration of for liquid suspended rotor micro-gyroscope. The detecting adopts continuous-time current sensing capacitance measurement. equivalent output noise power spectral density phase-sensitive demodulation 120 nV/Hz1/2. whole circuitry 0.5 μm 2P2M process its testing results show has a relative 1×10-8, in which supply 18 V consumption 30 mW. area chip merely 18.5 mm2.

This paper presents a low-power multistage amplifier with novel Transconductance Capacitances Feedback Compensation (TCFC) technique. A transconductance stage and two capacitors introduce negative feedback to three-stage amplifier, which significantly improves the performance such as gain-bandwidth product, slew rate, stability sensitivity. Implemented in commercial 0.5-μm CMOS technology driving 10pF capacitive load, TCFC achieves over 120dB gain, 1.515MHz GBW 1.3V/μS average while only...

This paper presents a micro-displacement sensing circuit, which can detect capacitors of levitated rotor. To ensure the high resolution, noise analysis pre-amplifier circuit is conducted. The results show that choosing low amp and decreasing Cf /C1 reduce electronic noise.

Based on requirements high performance and resolution of modulators, a fourth-order Sigma-Delta modulator for audio application is developed in this paper. The designed under the commercial 0.5μm CMOS process circuits are given simulations by Spectre. sampling frequency sigma-delta 11.264 MHz, OSR 256 within 22 kHz signal bandwidth. Measure shows that enables its maximum SNR to achieve 103.5dB, accuracy up 16 bit.

This paper presents a low-power multistage amplifier with novel capacitor-multiplier frequency compensation (CMFC) technique. The proposed strategy can allow the circuit to occupy less silicon area and drive large capacitive loads more effectively. Moreover, smaller physical capacitance results in higher gain-bandwidth product (GBW) improved transient responses. Furthermore, capacitor multiplier stage (CMS) embedded CMFC creates left-half plane (LHP) zero, which boosts phase margin enhances...

In this paper, we study the initial layer problem of Euler–Poisson in collisionless plasma that is rigorously proved by using weighted energy method coupled with multiscaling asymptotic expansions. We apply a formal expansion for Debye length and derive inner equations, which are used deriving error give out uniform estimate.

Abstract A low complexity resource allocation method is proposed for downlink non‐orthogonal multiple access system assisted by intelligent reflecting surface (IRS). Firstly, an optimisation problem formulated to minimise power consumption, with and IRS phase shifts as variables. Then, the joint of transformed into shifts, which further decomposed single variable sub‐problems, solutions can be obtained using function extremum method. Next, based on these one‐level iterative algorithm...

This paper presents a complete set of SIMULINK models, which allow exhaustive behavioral simulations fluxgate system to be performed. The model construction is detailed and it applied the Vacquier-type sensor. Well known characteristics these sensors are confirmed through simulations. In spite this simplicity, has been successfully used describe variation output sensor with amplitude frequency driving current. Using previously developed 2nd harmonic magnetometer, some preliminary...

A parametric surface mesh generation method, called bubble packing algorithm, is presented in this paper. The nodes on the curved can be considered as bubbles with interacting forces. node-spacing function determined by measurement which defined curvature of surface. grid size controlled both arc length deviation factors and spacing function. After dynamic simulation, a high-quality to connect their centres formed when are state force balance. algorithm examples indicate that generated...