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Simulation and verifi cation of an air-gun array wavelet in time-frequency domain based on van der waals gas equation

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Applied Geophysics 2020年第5期17卷 736-746,901,902页

作者： Zhang Dong Liu Huai-shan Xing Lei Li Qian-qian Liu Xue-qin Wei Jia Wang Jian-hua Zhou Heng Ge Xin-min Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of EducationCollege of Marine GeosciencesOcean University of ChinaQingdaoChina Qingdao Institute of Marine Geology China Geological SurveyMinistry of Natural ResourcesQingdaoChina Evaluation and Detection Technology Laboratory of Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdaoChina Acoustic Science and Technology Laboratory Harbin Engineering UniversityHarbinChina National Engineering Laboratory of Off shore Oil Exploration CNOOC Research InstituteBeijingChina BGP International CNPCZhuozhouChina China University of Petroleum(East China) QingdaoChina

An air gun generates acoustic signals for seismic exploration by releasing a high-pressure gas.A large error is always gradually introduced into the ideal-gas model when the pressure in the air-gun chamber exceeds 100 *** the van der waals non-ideal-gas theory,the gas in the air gun can be regarded as an actual gas,and the error is less than 2%.The van der waals model is established in combination with the quasi-static open thermodynamic system and bubble-motion equation by considering the bubble rise,bubble interaction,and throttling eff *** mismatch between the van der waals and ideal-gas models is related to the ***,under high-pressure conditions,the van der waals air-gun model yields results that are closer to the measured *** vertical cables are extended to the seafl oor using steel cables that connect the cement blocks,but the corresponding hydrophones are suspended in the ***,noise associated with ships,ocean surges,and coupling problems is avoided,and the signal-to-noise ratio and resolution of marine seismic data are *** acquisition method satisfies the conditions of recording air-gun far-fi eld *** to an actual vertical-cable observation system,the van der waals air-gun model is used to model the wavelet of different azimuth and take-off *** characteristics of the experimental and simulated data demonstrate good agreement,which indicates that the van der waals method is accurate and *** accuracy of the model is directly related to the resolution,thus aff ecting the resolution ability of the stratum.

关键词： Air-gun far-fi eld wavelet van der waals equation Marine vertical cables Timefrequency domain

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New solitary wave and other exact solutions of the van der waals normal form for granular materials

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Journal of Ocean Engineering and Science 2022年第2期7卷 170-177页

作者： Asim Zafar Tahir Mushtaq Aslam Malik Ahmet Bekir Department of Mathematics COMSATS University IslamabadVehari CampusPakistan Department of Mathematics University of the PunjabLahorePakistan Neighbourhood of Akcaglan Imarli StreetNumber:28/426030EskisehirTurkey

The investigation of exact solitary wave solutions to the nonlinear partial differential equation plays an important role to understand any physical phenomena in diverse applied *** current work is re-lated to the most prominent nonlinear model named as the van der waals normal form that appeared naturally and also industrially for the granular *** oceanography,the sea ice,sand and snow are some examples of aforesaid matter among *** employ two novel integration approaches named as the simplest equation method and the exp a function method to explore the above mentioned van der waals *** a backlash,many new solitary waves and other exact solutions are *** ob-tained results depict that the used approaches are simple and effective to deal with nonlinear ***,the numerical simulation of some solutions via two and three dimension graphical configurations are presented for certainty and exactness.

关键词： van der waals equation Novel integration schemes Solitary wave solutions

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Local Stability Analysis of a Curzon-Ahlborn Engine without Ideal Gas Working at the Maximum Ecological Regime

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Journal of Energy and Power Engineering 2013年第5期7卷 928-936页

作者： Ricardo Paiez Hernandez Delfino Ladino Luna Pedro Portillo Diaz Marco A Barranco Jimenez Irreversible Processes Physics Research Group Basic Sciences Department Metropolitan Autonomous University CampusAzcapotzalco Distrito Federal 02200 Mdxico Basic Sciences Department Metropolitan Autonomous University Campus Azcapotzalco Distrito Federal 02200 M~xico Information Technology School of the National Polytechnic Institute Distrito Federal 07738 Mexico

In this work, the stability of an endoreversible Curzon-Ahlbom engine is analyzed, using van der waals gas as a working substance and the corresponding efficiency for this engine working at temperatures withinthe maximum ecological regime. By mean s of a local stability analysis we find that a critical point of an almost linear system is stable andanalytically expressed in eigenvalues. After an arbitrarily small perturbation, the system state exponentially decays to a critical point, with either of two characteristic relaxation times, which are a function of the thermal conductance （a）, heat capacity （C） and T=T2/T1. The behavior of relaxation times and solution of the systems are qualitatively shown by sketching its phase portrait, which results susceptible to operating regimes, i.e., the eigenvectors in the maximum ecological regime have a clockwise rotation with respect to the eigenvectors in the regime of maximumpower. Finally, it has to observe that afterto λvw = 1, approximation,ηVWE=4^-3ηC is obtained, where ηVWE is the van der waals efficiency atrnaximum ecological regime and r/c is Carnot＇s efficiency. Finally, it discussed the local stability and steady state of the energetic properties of the endoreversible engine.

关键词： Ecological regime dynamics van der waals equation stability steady state.

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