The perfectly matched layer (PML) was first introduced by Berenger as a material absorbing boundary condition (ABC) for electromagnetic waves. In this paper, method is developed to extend the simulating seismic wave propagation in poroelastic media. This nonphysical used at computational edge of finite‐difference algorithm an ABC truncate unbounded incorporation PML Biot’s equations different from other applications that additional term involving convolution between displacement and loss...

A particle velocity-strain, finite-difference (FD) method with a perfectly matched layer (PML) absorbing boundary condition is developed for the simulation of elastic wave propagation in multidimensional heterogeneous poroelastic media. Instead widely used second-order differential equations, first-order hyperbolic leap-frog system obtained from Biot's equations. To achieve high accuracy, discretized on staggered grid both time and space. The at computational edge to absorb outgoing waves....

A 3D multidomain pseudospectral time-domain method is developed for elastic wave equations. The based on the spectral derivative operator approximated by Chebyshev or Lagrange polynomials. Unlike Fourier that assumes periodic boundary conditions, allows incorporation of various conditions (such as free surface condition) into numerical scheme. In this scheme, computational domain decomposed a set subdomains conformal to problem geometry. Each curved subdomain then mapped onto cube in...

A three-dimensional (3-D) multidomain pseudospectral time-domain (PSTD) method with a well-posed PML is developed as an accurate and efficient solver for Maxwell's equations in conductive inhomogeneous media. The curved object accurately treated by curvilinear coordinate transformation. Spatial derivatives are obtained the Chebyshev collocation to achieve high-order accuracy. Numerical results show excellent agreement solutions FDTD under fine sampling.

Acoustic waves can be a viable tool for the detection and identification of land mines, unexplored ordnance (UXO), other buried objects. Design acoustic instruments interpretation processing measurements call accurate numerical models to simulate wave propagation in heterogeneous soil with Compared traditional seismic exploration, high attenuation is unfortunately ubiquitous shallow surface because loose fluid its pore space. To adequately model such attenuation, we propose comprehensive...

Accurate detection of nanometer CMOS circuits is one the most critical issues for tolerating negative bias temperature instability (NBTI). In this paper, a fully digital on-chip aging detector, which achieves direct correlation between threshold voltage degradation (Δ Vth) and phase difference, has been proposed. The linear realized based on our revised Schmitt triggers in stressed fresh devices are embedded. Moreover, readout circuit designed to count, lock, output samples through...

A multidomain pseudospectral time-domain (PSTD) method is developed for acoustic wave equations in lossy media. The based on the spectral derivative operator approximated by Chebyshev Lagrange polynomials. In this scheme, computational domain decomposed into a set of subdomains conformal to problem geometry. Each curved subdomain then mapped onto cube curvilinear coordinates so that tensor-product grid can be utilized without staircasing error. An unsplit-field, well-posed PML as absorbing...

This article presents a digital readout integrated circuit (DROIC) with fully ON-chip image algorithm calibration based on the pixel-level 18-bit analog-to-digital converter (ADC) for infrared focal plane array (IRFPA) applications. Such calibrations include bad pixel compensation, nonuniformity correction, and background subtraction, which are implemented to avoid memory storage saving power area. The proposed DROIC was fabricated in standard 40-nm CMOS process, it features <inline-formula...

Bunkering of alternative marine fuels such as LNG, methanol, ammonia, and hydrogen presents a high risk leakage due to temporary connections during transfers. Gas clouds from leakages can result in hazardous events including fires, explosion, sometimes toxic plumes. Release which are normally stored under cryogenic liquid conditions, results complex multiphase phenomena forming mixture droplet-vapour near field. Accumulation droplets on the ground is referred rainout effectively reduce mass...

This paper analyzes the working principle and electrical structure of fast chargers, chooses typical charging stations based on capacity regional power grid, measures harmonic different chargers. The test data sizes is analyzed, difference between measured theoretical value compared. Then, current multistage machine simultaneously measured, relation size with electric car pile studied. Based data, this studies characteristics scope in view parameters determines efficiency factor, compare...

论坛"野生动物"的概念框架和术语定义摘要: "野生动物"(wild animal)一词不止在我国, 在全球的英语使用者中也有不同的含义。通过梳理相关研究、国 内法和国际法背景下的定义和适用范围, 结合人类对动物繁殖和生活条件的控制情况, 本文提出了"野生动物"的 二维概念框架, 梳理了动物从"野生"到"驯化"的12个连续状态。

The impact of negative bias temperature instability (NBTI) can be ascribed to three mutually uncorrelated factors, including hole trapping by pre-existing traps ( in gate insulator, generated bulk and interface trap generation (. In this paper, we have experimentally investigated the NBTI characteristic for a 40-nm complementary metal–oxide semiconductor (CMOS) process. power-law time dependence, activation, field acceleration also been explored based on physical reaction–diffusion model....

Only the quantitative analysis and systematic evaluation of tourism resources, we can get comprehensive measurement resources value, thus making accurate target market actively seeking sustainable unique ways development, authentically satisfy requirements ecotourism development. According to this, this study integrated lake characteristics, using three methods: Delphi method, analytic hierarchy process, fuzzy constructed system model development engineering evaluation, developed theory...

Empirical researchers and decision-makers spanning various domains frequently seek profound insights into the long-term impacts of interventions. While significance outcomes is undeniable, an overemphasis on them may inadvertently overshadow short-term gains. Motivated by this, this paper formalizes a new framework for learning optimal policy that effectively balances both rewards, where some are allowed to be missing. In particular, we first present identifiability rewards under mild...

Entrepreneurial aspirations and career orientation are crucial in shaping the professional futures of vocational college students China. This study explores relationship between these factors, surveying 385 from various institutions. The findings reveal that most respondents, aged 18 to 25, at a critical stage development, with notable interest entrepreneurship. trend underscores growing inclination toward innovation self-employment among students. Students identified strongly...

This study conducted experimental teaching of vocational college English listening and speaking courses in both smart classroom simple multimedia environments. Using an improved version the Flipped Classroom Interaction Analysis System (SCIAS) questionnaires, supplemented by S-T analysis as a complementary research method, comparative records terms structure, emotional atmosphere, interactive behaviors between teachers students, interpersonal interactions, interactions teachers, media...

Learning is a kind of important human behavior to acquire knowledge.This paper discussed temporal characteristics network course learning on dynamics.Firstly, the students data for 8-weeks are collected from online platform.Then, work used Maximum Likelihood Estimation(MLE) method estimating power exponent interval time distribution, and introduced Kolmogorov-Smirnov(KS) test power-law hypothesis .The empirical research results show that: both in group individual level, obey...