The fluid-saturated porous layered(FSPL)media widely exist in the Earth's subsurface and their overall mechanical properties,microscopic pore structure and wave propagation characteristics are highly relevant to t...The fluid-saturated porous layered(FSPL)media widely exist in the Earth's subsurface and their overall mechanical properties,microscopic pore structure and wave propagation characteristics are highly relevant to the in-situ stress.However,the effect of in-situ stress on wave propagation in FSPL media cannot be well explained with the existing theories.To fill this gap,we propose the dynamic equations for FSPL media under the effect of in-situ stress based on the theories of poroacoustoelasticity and anisotropic elasticity.Biot loss mechanism is considered to account for the stress-dependent wave dispersion and attenuation induced by global wave-induced fluid flow.Thomsen's elastic anisotropy parameters are used to represent the anisotropy of the skeleton.A plane-wave analysis is implemented on dynamic equations yields the analytic solutions for fast and slow P waves and two S waves.Modelling results show that the elastic anisotropy parameters significantly determine the stress dependence of wave velocities.Vertical tortuosity and permeability have remarkable effects on fast and slow P-wave velocity curves and the corresponding attenuation peaks but have little effect on S-wave velocity.The difference in velocities of two S waves occurs when the FSPL medium is subjected to horizontal uniaxial stress,and the S wave along the stress direction has a larger velocity,which implies that the additional anisotropy other than that induced by the beddings appears due to horizontal stress.Besides,the predicted velocity results have the reasonable agreement with laboratory measurements.Our equations and results are relevant to a better understanding of wave propagation in deep strata,which provide some new theoretical insights in the rock physics,hydrocarbon exploration and stress detection in deep-strata shale reservoirs.展开更多
The Internet of Vehicles(IoVs)has seen rapid development due to advances in advanced communication technologies.The 5-th Generation(5G)systems will be integrated into next-generation vehicles,enabling them to operate ...The Internet of Vehicles(IoVs)has seen rapid development due to advances in advanced communication technologies.The 5-th Generation(5G)systems will be integrated into next-generation vehicles,enabling them to operate more efficiently by cooperating with the environment.The millimeter Wave(mmWave)technology is projected to provide a large bandwidth to meet future needs for more effective data rate communications.A viable approach for transferring raw sensor data among autonomous vehicles would be to use mmWave communication.This paper attracts various research interests in academic,indoor,and outdoor mmWave operations.This paper presents mmWave propagation measurements for indoor and outdoor at 66 GHz frequency for IoVs scenarios.The proposed model examines the equivalent path loss using Free-Space Path Loss(FSPL)based on the transmitter and receiver distances for indoor and outdoor communications of the vehicles.In the indoor scenario,path loss propagation has the lowest penetration loss,but it is ineffective in the outdoor scenario because distance increases as free space path loss increases.The probability of error is increased,concerning the transmitter and receiver distances due to propagation effect,packet collisions,busy receiver,and sensing threshold.The proposed methodology shows a higher packet delivery ratio and average throughput with less delay in the connection during transmission.展开更多
The fractional single-phase-lagging(FSPL)heat conduction model is obtained by combining scalar time fractional conservation equation to the single-phase-lagging(SPL)heat conduction model.Based on the FSPL heat conduct...The fractional single-phase-lagging(FSPL)heat conduction model is obtained by combining scalar time fractional conservation equation to the single-phase-lagging(SPL)heat conduction model.Based on the FSPL heat conduction model,anomalous diffusion within a finite thin film is investigated.The effect of different parameters on solution has been observed and studied the asymptotic behavior of the FSPL model.The analytical solution is obtained using Laplace transform method.The whole analysis is presented in dimensionless form.Numerical examples of particular interest have been studied and discussed in details.展开更多
基金the sponsorship of the National Natural Science Foundation of China(Grant Nos.42174139,41974119,42030103)the Laoshan Laboratory Science and Technology Innovation Program(Grant No.LSKJ202203406)+1 种基金the China Scholarship Council(Grant No.202206450050)the Innovation Fund Project for Graduate Students of China University of Petroleum(East China)(Grant No.23CX04003A)。
文摘The fluid-saturated porous layered(FSPL)media widely exist in the Earth's subsurface and their overall mechanical properties,microscopic pore structure and wave propagation characteristics are highly relevant to the in-situ stress.However,the effect of in-situ stress on wave propagation in FSPL media cannot be well explained with the existing theories.To fill this gap,we propose the dynamic equations for FSPL media under the effect of in-situ stress based on the theories of poroacoustoelasticity and anisotropic elasticity.Biot loss mechanism is considered to account for the stress-dependent wave dispersion and attenuation induced by global wave-induced fluid flow.Thomsen's elastic anisotropy parameters are used to represent the anisotropy of the skeleton.A plane-wave analysis is implemented on dynamic equations yields the analytic solutions for fast and slow P waves and two S waves.Modelling results show that the elastic anisotropy parameters significantly determine the stress dependence of wave velocities.Vertical tortuosity and permeability have remarkable effects on fast and slow P-wave velocity curves and the corresponding attenuation peaks but have little effect on S-wave velocity.The difference in velocities of two S waves occurs when the FSPL medium is subjected to horizontal uniaxial stress,and the S wave along the stress direction has a larger velocity,which implies that the additional anisotropy other than that induced by the beddings appears due to horizontal stress.Besides,the predicted velocity results have the reasonable agreement with laboratory measurements.Our equations and results are relevant to a better understanding of wave propagation in deep strata,which provide some new theoretical insights in the rock physics,hydrocarbon exploration and stress detection in deep-strata shale reservoirs.
文摘The Internet of Vehicles(IoVs)has seen rapid development due to advances in advanced communication technologies.The 5-th Generation(5G)systems will be integrated into next-generation vehicles,enabling them to operate more efficiently by cooperating with the environment.The millimeter Wave(mmWave)technology is projected to provide a large bandwidth to meet future needs for more effective data rate communications.A viable approach for transferring raw sensor data among autonomous vehicles would be to use mmWave communication.This paper attracts various research interests in academic,indoor,and outdoor mmWave operations.This paper presents mmWave propagation measurements for indoor and outdoor at 66 GHz frequency for IoVs scenarios.The proposed model examines the equivalent path loss using Free-Space Path Loss(FSPL)based on the transmitter and receiver distances for indoor and outdoor communications of the vehicles.In the indoor scenario,path loss propagation has the lowest penetration loss,but it is ineffective in the outdoor scenario because distance increases as free space path loss increases.The probability of error is increased,concerning the transmitter and receiver distances due to propagation effect,packet collisions,busy receiver,and sensing threshold.The proposed methodology shows a higher packet delivery ratio and average throughput with less delay in the connection during transmission.
文摘The fractional single-phase-lagging(FSPL)heat conduction model is obtained by combining scalar time fractional conservation equation to the single-phase-lagging(SPL)heat conduction model.Based on the FSPL heat conduction model,anomalous diffusion within a finite thin film is investigated.The effect of different parameters on solution has been observed and studied the asymptotic behavior of the FSPL model.The analytical solution is obtained using Laplace transform method.The whole analysis is presented in dimensionless form.Numerical examples of particular interest have been studied and discussed in details.
