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Fractional derivative statistical damage model of unsaturated expansive soil based on unified hydraulic effect
Unsaturated expansive soil is widely distributed in China and has complex engineering properties. This paper proposes the unified hydraulic effect...
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Modelling disease spread with spatio-temporal fractional derivative equations and saturated incidence rate
The global analysis of a spatio-temporal fractional order SIR infection model with saturated incidence function is suggested and studied in this...
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Derivative-free search approaches for optimization of well inflow control valves and controls
Decisions regarding problem conceptualization, search approach, and how best to parametrize optimization methods for practical application are key to...
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A simplified calculation for adaptive coefficients of finite-difference frequency-domain method
The finite-difference frequency domain (FDFD) method is widely applied for simulating seismic wavefields, and a key to achieving successful FDFD...
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Calculation method of formation dip angle based on deep learning
The formation dip angle is an important characteristic parameter that reflects underground structures, and it is widely used in seismic exploration...
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Calculation Method of Three-Dimensional Slope Safety Factor with Simultaneous Change of Height and Angle
The simultaneous variation of slope height and slope feet angle is a significant feature of three-dimensional slopes. Expanding the safety factor of...
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Uncertainty analysis for the calculation of marine environmental design parameters in the South China Sea
The calculation results of marine environmental design parameters obtained from different data sampling methods, model distributions, and parameter...
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A new derivative-based method for determination of bubble point pressure of hydrocarbon systems
The bubble point pressure is essential for planning and managing oil field development and production strategies. The conventional procedure of the...
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A comprehensive analysis of transient rate and rate derivative data of an oil well intercepted by infinite-conductivity hydraulic fracture in closed systems
This paper presents a method for analyzing constant-pressure drawdown test of infinite-conductivity fractured wells in bounded reservoirs. The...
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Spatial Filter for the Pseudo-spectral Implementation of Fractional Derivative Wave Equation
The viscoelasticity of the subsurface media varies spatially, and such viscoelasticity can be represented concisely by a wave equation in the form of...
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Simplified Calculation of Earthquake Energy Transfer of Different Pipe Supports Inside Utility Tunnel at Horizontal Non-Homogeneous Field
A buried utility tunnel can effectively protect internal pipes by preventing or mitigating corrosion, external damage, and facilitating maintenance....
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Vertical derivative conversion of irregular-range potential field data based on improved projection onto convex sets method
Gravity and magnetic exploration areas are usually irregular, and there is some data deficiency. Missing data must be interpolated before the...
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Derivative-free trust region optimization for robust well control under geological uncertainty
A Derivative-Free Trust-Region (DFTR) algorithm is proposed to solve the robust well control optimization problem under geological uncertainty....
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A novel Schiff base of pyridine-2-amine derivative as an effective inhibitor of the dissolution of N80 pipeline steel in 1 M HCl
An investigation of the performance of recently synthesized pyridine-2-amine derivative namely, N-(5-methoxy-2-hydroxybenzylidene)pyridine-2-amine...
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A new chloro-azaphilone derivative with pro-angiogenesis activity from the hadal trench-derived fungus Chaetomium globosum YP-106
A new chloro-azaphilone derivative chaetoviridin L ( 1 ) along with four known analogues, namely, chaetomugilin A ( 2 ), chaetoviridin E ( 3 ),...
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Automated seismic horizon recognition from seismic data using correlation exponent and its double derivative: a case study of Parihaka field, Offshore Taranaki Basin, New Zealand
We approach the problem of identifying the stratigraphic markers using seismic data in automated mode. This automation would be achieved through the...
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Carbonate / siliciclastic lithofacies classification aided by well-log derivative, volatility and sequence boundary attributes combined with machine learning
Derivative and volatility attributes calculated for well-log versus depth sequences extract characteristics that can be usefully exploited by...
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Expressions for the calculation of isotropic Gaussian filter kernels in the spherical harmonic domain
The isotropic Gaussian filter has been used extensively in Gravity Recovery and Climate Experiment (GRACE) temporal gravity field solutions, and is...
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A Method of Strain Rate Calculation Based on GNSS Time Series and Its Accuracy Analysis
AbstractOur study is based on 68 continuous GNSS observation data time series in Sichuan-Yunnan covering 4 years. We detected and deleted the...
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Stress field and stability calculation method for unloading slope considering the influence of terrain
The initial terrain of a slope has a significant impact on the stability and stress state during excavation. In this study, the theory of elastic...
