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Nonlinear Young’s Modulus of New Red Sandstone:Experimental Studies

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Acta Mechanica Solida Sinica 2021年第6期34卷 989-999页

作者： Evgenii Riabokon Vladimir Poplygin mikhail Turbakov Evgenii Kozhevnikov Dmitrii Kobiakov mikhail guzev Marian Wiercigroch Centre for Applied Dynamics Research School of EngineeringUniversity of AberdeenAberdeenUK Department of Oil and Gas Technologies Perm National Research Polytechnic UniversityPermRussia Institute of Applied Mathematics Far Eastern Branch of the Russian Academy of SciencesVladivostokRussia

Young’s modulus of New Red Sandstone was investigated experimentally to gain insight into its nonlinear nature.A large experimental programme was carried out by applying a controllable quasi-static and dynamic uniaxial loading to 286 dry sandstone samples of four different *** static and dynamic tests,similar to those aiming at determining the uniaxial compressive strength,were conducted using the state-of-the-art experimental facilities at the University of Aberdeen including a custom-built small experimental rig for inducing a dynamic uniaxial compressive load via a piezoelectric *** obtained results have confirmed a complex nature of Young’s modulus of ***,under a harmonic dynamic loading,it shows strongly nonlinear behaviour,which is hardening and softening with respect to frequency and amplitude of the dynamic loading,respectively.

关键词： Sandstone Young’s modulus Static and dynamic loading Experiments Stress and strain Nonlinearity

Assessment of the Elastic-Wave Well Treatment in Oil-Bearing Clastic and Carbonate Reservoirs

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1495-1505页

作者： Vladimir Poplygin Chengzhi Qi mikhail guzev Evgenii Kozhevnikov Artem Kunitskikh Evgenii Riabokon mikhail Turbakov Perm National Research Polytechnic University Perm614990Russian Beijing University of Civil Engineering and Architecture Beijing100049China Institute for Applied Mathematics FEB RAS Vladivostok690041Russian

A set of techniques for well treatment aimed to enhance oil recovery are considered in the present *** are based on the application of elastic waves of various types(dilation-wave,vibro-wave,or other acoustically induced effects).In such a context,a new technique is proposed to predict the effectiveness of the elastic-wave well treatment using the rank distribution according to Zipf’s *** is revealed that,when the results of elastic wave well treatments are analyzed,groups of wells exploiting various geological deposits can differ in terms of their slope coefficients and free *** the slope coefficient increases,the average increase in the well oil production rate(after the well treatment)becomes *** equation is obtained accordingly for estimating the slope coefficient in the Zipf’s equation from the frequency of the elastic *** obtained results demonstrate the applicability of the Zipf’s law in the analysis of the technological efficiency of elastic-wave well treatment methods.

关键词： Elastic wave well treatment oil well rate Zipf’s law rank distribution slope coefficient

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厚壁筒的一种简化弹性应变梯度模型

解放军理工大学学报（自然科学版） 2014年第1期15卷 30-37页

作者：李凯锐戚承志 guzev mikhail 北京建筑大学北京市高校工程结构与新材料工程研究中心北京100044 俄罗斯科学院远东分院应用数学研究所

在Toupin-Mindlin应变梯度理论框架内,建立了一种关于厚壁筒的应变梯度模型,并利用打靶法和拟牛顿迭代法实现了两点复杂边界条件和四阶常微分平衡方程的求解,得到了厚壁筒应力场和位移场精确数值解。为了降低该模型的复杂性和提高该模... 详细信息

在Toupin-Mindlin应变梯度理论框架内,建立了一种关于厚壁筒的应变梯度模型,并利用打靶法和拟牛顿迭代法实现了两点复杂边界条件和四阶常微分平衡方程的求解,得到了厚壁筒应力场和位移场精确数值解。为了降低该模型的复杂性和提高该模型的适用性,通过对高阶应力做出简化假设,得到了简化的平衡方程和相应的厚壁筒应力、应变的解析解。通过对厚壁筒经典弹性理论解析解、梯度理论简化解和梯度理论精确数值解的比较,检验了简化模型解析解的可行性和精确性,并得到了梯度理论和经典理论在厚壁筒应用上的差异性。

关键词：应变梯度理论厚壁筒高阶应力简化模型解析解

Corrigendum to “Non-classical solutions of a continuum model for rock descriptions” [J Rock Mech Geotech Eng 6(3)(2014) 180e185]

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Journal of Rock Mechanics and Geotechnical Engineering 2015年第3期7卷 358-358页

作者： mikhail A.guzev Institute for Applied Mathematics Far Eastern Branch of the Russian Academy of Sciences

The author regrets that the acknowledgement section was inadvertently missed out in the published *** Acknowledgement is given below:The author is grateful to the academician Qihu Qian for constructive *** paper was supported by grant numbers No.13-06-011 3m-a from the"Scientific Fund"of Far Eastern Federal University and the Ministry of Education and Science of the Russian Federation Grant No.5.2535.2014K.

关键词： Corrigendum to J Rock Mech Geotech Eng 6 Non-classical solutions of a continuum model for rock descriptions

基于现场试井数据和岩心驱替试验的采油初期渗透率演化规律

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岩土力学 2023年第3期44卷 834-842页

作者： KOZHEVNIKOV V.Evgenii TURBAKOV S.mikhail RIABOKON P.Evgenii GLADKIKH A.Evgeniy POPLYGIN V.Vladimir guzev A.mikhail 戚承志彼尔姆国立科研理工大学石油和天然气技术系俄罗斯彼尔姆614990 俄罗斯科学院远东分院应用数学研究所俄罗斯符拉迪沃斯托克690041 北京建筑大学土木与交通工程学院中国北京100044

油气开采过程中渗透率预测是一个非常重要的问题。由于油气储量衰竭导致渗透率降低,储层压力下降(有效压力增加),导致油气生产时间增加。对有效压力导致渗透率降低的问题进行了大量研究,主要是通过各种方法建立渗透率模型,如岩心驱替试... 详细信息

油气开采过程中渗透率预测是一个非常重要的问题。由于油气储量衰竭导致渗透率降低,储层压力下降(有效压力增加),导致油气生产时间增加。对有效压力导致渗透率降低的问题进行了大量研究,主要是通过各种方法建立渗透率模型,如岩心驱替试验和现场试井。前期研究结果表明,渗透率对有效压力具有幂律或指数依赖性,然而,预测渗透率的困难在于滞后现象,其原因尚不完全清楚。一些学者利用储层力学模型模拟渗透率以及解释滞后的原因,但该模型在油气生产初期有效压力波动较小时并不适用。在这项工作中,分析Perm地区北部一个油田的试井数据得出:生产初期的储层渗透率很大程度上取决于流体产出量。基于陆相储层的试井数据,得到一个描述采油初期渗透率变化的模型。为验证该模型,根据专门开发的程序对陆相储层样品进行岩心驱替试验。岩心驱替结果表明,从试井数据中获得的模型具有高收敛性。利用计算机断层扫描(computed tomography,简称CT)和扫描电镜(scanning electron microscope,简称SEM)研究岩心孔隙的属性和结构,发现天然胶体的迁移是生产初期低黏土岩石渗透率下降的主要原因。

关键词：渗透率渗透率滞后胶体迁移岩心驱替多孔介质

An application of space-filling curves to improve results of turbulent aerodynamics modeling with convolutional neural networks

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Chinese Journal of Aeronautics 2024年第2期37卷 81-92页

作者： mikhail PETROV Sofia ZIMINA Moscow Institute of Physics&Technology Dolgoprudny 141701Russia

When carrying out calculations for turbulent flow simulation,one inevitably has to face the choice between accuracy and speed of *** order to simultaneously obtain both a computationally efficient and more accurate model,a surrogate model can be built on the basis of some fast special model and knowledge of previous calculations obtained by more accurate base models from various test bases or some results of serial *** objective of this work is to construct a surrogate model which allows to improve the accuracy of turbulent calculations obtained by a special model on unstructured *** this purpose,we use 1D Convolutional Neural Network(CNN)of the encoder-decoder architecture and reduce the problem to a single dimension by applying space-filling *** an approach would have the benefit of being applicable to solutions obtained on unstructured *** this work,a non-local approach is applied where entire flow fields obtained by the special and base models are used as input and ground truth output ***-Allmaras(SA)model and Near-wall Domain Decomposition(NDD)method for SA are taken as the base and special models *** efficiency and accuracy of the obtained surrogate model are demonstrated in a case of supersonic flow over a compression corner with different values for angleαand Reynolds number *** conducted an investigation into interpolation and extrapolation by Re and also into interpolation byα.

关键词： Space-filling curves Convolutional neural network Domain decomposition Turbulent flows Unstructured mesh

From Dyakonov-Cherenkov radiation to Dyakonov surface optics

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Light(Science & Applications) 2022年第4期11卷 453-454页

作者： mikhail Dyakonov University of Montpellier MontpellierFrance

Cherenkov radiation by swift charged particles in a dielectric medium has been used for a long time as an effective means for particle detection and measurements of their *** a team led by *** Luo from Singapore considers a situation when the particle emits surface electromagnetic waves at the interface between an isotropic and a uniaxial-birefringent medium(Dyakonov surface waves6).The resulting Dyakonov-Cherenkov radiation is shown to be highly sensitive to both the value and the direction of the particle *** particular,it is shown that close to the Cherenkov threshold,the radiation intensity can be several orders of magnitude greater than that in traditional Qierenkov *** new features allow to determine simultaneously the magnitude and direction of particle velocities on a compact platform(Fig.1).

关键词： optics particle surface

Fritz Ackermann:a true and unequalled friend

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Geo-Spatial Information Science 2023年第2期26卷 151-152页

作者： Ed mikhail Professor Emeritus&Former Head Geomatics Engineering Purdue UniversityWest LafayetteINUSA

I am certain that several other contributors to this memorial volume have expounded on the many attributes,both professional and personal,of Professor Fritz *** is unquestionable that he was a giant in our field,on whose shoulders current and future practitioners shall stand in order to keep the wheels of progress and advancement moving forward.

关键词： moving Fritz Ackermann

Medicine has always been "Modern" and "Scientific" from ancient times to the present day

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Journal of Integrative Medicine 2019年第4期17卷 229-237页

作者： mikhail Teppone Bionion Sdn Bhd 1 Jalan Sungai Jeluh Bhmed INC PTE.LTD.

Throughout human history, doctors and healers have gathered and refined the knowledge inherited from the previous generations. Different methods of effective therapy have been designed during various historical periods;when each was developed, it was considered "modern scientific medicine" for their time. Mankind has gone through natural and social disasters and survived;hence, history has proved there was no time when medical knowledge was eironeous or ineffective. Classic medicine has grown to be divided into narrow, specialized branches, causing it to lose its holistic approach and general view on health, sickness and therapeutic methods. Many of traditional medicine's effective methods have been forgotten and removed from the mainstream medicine. It would be good for modern medical education to incorporate the general knowledge of historically effective therapeutic modalities and study practical cases. Medical students should be taught how to choose a "good method" or "good medicine" independent of when that method or remedy was discovered. However, he has to keep in mind the primary goal of medicine:"I will use treatment to help the sick according to my ability and judgment..."(from Hippocratic Oath).

关键词： Integrative medicine Alternative medicine Traditional Chinese medicine Homeopathy Cellular therapy