LBM simulation of fluid flow in fractured porous media with permeable matrix

To analyze and depict complicated fluid behaviors in fractured porous media with variably permeable matrix,an integrated discrete computational algorithm is proposed based on lattice Boltzmann method（LBM）.This paper combines with the external force model and statistical material physics to effectively describe the feature changes while the fluid passes through the fractures within the permeable matrix.As an application example,a two dimensional rock sample is reconstructed using the digital image and characterized with different feature values at each LBM grid to distinguish pores,impermeable and permeable matrix by stating its local physical property.Compared with the conventional LBM,the results demonstrate the advantages of proposed algorithm in modeling fluid flow phenomenon in fractured porous media with variably permeable matrix.

Rock matrix-fractured media model for heterogeneous and fractured coal bed

Coal was considered rock matrix-fractured media composed of rock matrix and fractures, and the rock matrix-fractured media model for heterogeneous and fractured coal bed was presented. In this model the rock matrix is heterogeneous, and the mechanical parameters such as elastic modulus and strength follow Weibull distribution. Fractures in coal bed were generated with the discrete fracture network method, and the properties of fractures were simulated with Desai element. Then the virtual generating system (VGS) of natural heterogeneous and fractured coal bed was developed in Matlab 6.0. The coupled model of gas flow and deformation process based on the rock matrix-fractured media model method and VGS for heterogeneous and fractured coal bed was presented, and the numerical code was developed in Matlab 6.0. The gas flow process in the heterogeneous and fractured coal bed was simulated in a numerical case. The main conclusions are: 1) The natural heterogeneous and fractured coal bed could be simulated by the rock matrix-fractured media model and VGS; 2) The fractures connected with the well have much more effects on gas flow than those non-connected.

Recursive Asymptotic Hybrid Matrix Method for Acoustic Waves in Multilayered Piezoelectric Media

This paper presents the recursive asymptotic hybrid matrix method for acoustic waves in multilayered piezoelectric media. The hybrid matrix method preserves the numerical stability and accuracy across large and small thicknesses. For discussion and comparison, the scattering matrix method is also presented in physics-based form and coherent form. The latter form resembles closely that of hybrid matrix method and helps to highlight their relationship and distinction. For both scattering and hybrid matrix methods, their formulations in terms of eigenwaves solution are provided concisely. Making use of the hybrid matrix, the recursive asymptotic method without eigenwaves solution is described and discussed. The method bypasses the intricacies of eigenvalue-eigenvector approach and requires only elementary matrix operations along with thin- layer asymptotic approximation. It can be used to determine Green’s function matrix readily and facilitates the trade-off between computation efficiency and accuracy.

科学家精神的具象化传播:叙事体系、媒体矩阵与互动机制

在新时代主流意识形态走向具象化传播的趋势下,科学家精神在全媒体传播生态中仍存在传播范围有限、针对性与传播力不强的现实困境。因此,科学家精神传播的跨媒介叙事体系应当建立“元叙事体系搭建—跨媒介传播调试—自互动参与机制”的科学家精神传播路线,搭建有效的叙事框架,建立起跨媒介、多模态的科学家精神传播渠道,构建科学家精神传承与传播的互动参与机制,将叙事体系、媒体矩阵、互动机制有机结合,以达到对科学家精神更为精准和有效的传播。

新媒体矩阵视域下江西文学经典的传播力提升

在新媒体飞速发展的时代背景下,文学经典的传播媒介和传播环境在不断更新和变化。借助新媒体矩阵传播文学经典,理应成为提升文学经典传播力的重要抓手,但这在以往的研究中并未引起足够的重视。本研究基于文学与传播学的学科交叉融合,考察江西文学经典传播现状,探寻“新媒体矩阵+文学经典”的文学传播理论和研究范式。研究发现,构建新媒体矩阵并采用新媒体表达方式和呈现形式进行对外传播,能有效提升江西文学经典的传播力。

融媒体视域下高校新媒体矩阵传播策略研究

随着信息技术的飞速发展,融媒体时代已经到来,传统媒体与新媒体的深度融合成为传播领域的新趋势。高校作为知识传播与人才培养的重要阵地,其新媒体矩阵在信息传播、文化引领等方面发挥着举足轻重的作用。然而,面对融媒体带来的挑战与机遇,高校新媒体矩阵如何调整传播策略,以更好地服务师生、提升影响力,成为亟待解决的问题。对此,本文旨在探讨融媒体视域下高校新媒体矩阵的建设现状及其传播策略,以期为教育工作者提供参考和借鉴。

科技期刊集群化发展与服务能力建设研究

我国科技期刊集群化建设已经取得了重要进展,对促进科技期刊的发展发挥了重要作用,但在集群化服务能力方面还需要进一步提升,加强对科技期刊集群化服务能力建设的研究具有重要的意义。文章分析了当前国内期刊集群化建设模式,总结了同一主管或主办主体集约化期刊集群和联盟式期刊集群两种主要的集群模式。对推动科技期刊发展,这两种模式都取得了很好的成效,但也存在产业能力、发展合力和服务能力上的不足。结合存在的不足,文章指出科技期刊集群的发展方向,除了要聚焦于期刊影响力和评价指标的提升,还应加强对学科的服务能力,自身的产业能力以及提高对作者读者的服务能力方面的建设,加强期刊集群全媒体矩阵能力的建设。文章介绍了《金属矿山》在集群化建设方面进行的探索,通过建设地方性期刊集群和数字化期刊集群,来提升期刊的综合服务能力。

当代生态环境类政务公众号的发展前景和进化路径——以“广东生态环境”政务微信公众号为例

本文从“广东生态环境”政务微信公众号(以下简称“粤环微信公众号”)建设历程、运营情况、经验总结等方面,综合评价其所取得的成效,阐述粤环微信公众号起到的推进环境治理现代化、促进公众参与的积极作用,探索当前技术不断革新、手段日趋丰富的情况下,政务公众号的发展前景和进化路径。

医药企业新媒体矩阵传播策略研究——以亚宝药业为例

本文从面向目标消费者(B2C),以及面向企业、利益相关方(B2B)两个维度入手分析了亚宝药业不同新媒体平台公号的传播目标和传播效果。研究发现,亚宝药业通过对新媒体矩阵的统合管理,初步形成“传播系统合力”,辐射各自不同的目标受众人群,公号间相互联系支撑,发挥出立体化传播的优势。研究建议,亚宝药业建立跨部门沟通机制,拓展矩阵宽度,创新传播形式,促进新媒体矩阵进一步提升竞争力。

短视频平台对大学生思想政治教育的影响与对策探研

随着互联网技术的高速发展以及智能手机的广泛普及,短视频行业迅速发展壮大,短视频逐渐成为自媒体时代下人们消遣娱乐、记录生活的重要方式。而短视频的发展对大学生思想政治教育工作来说,既是机遇,也是挑战。文章结合教学实践,在阐述短视频平台特点的基础上,分析其对大学生思想政治教育的积极影响与消极影响,探究发挥短视频平台在大学生思想政治教育中作用的有效对策,旨在为新形势下大学生思想政治教育工作提供方法借鉴。

隔离层下单漏斗放矿力链演变的参数敏感性分析

利用PFC软件,以同步充填留矿法为背景,选取隔离层厚度A、隔离层界面摩擦因数B、矿石颗粒摩擦因数C及颗粒半径D作为正交试验的四种影响因素,对力链特征参数的一般变化规律进行分析,研究影响力链演变的参数及其敏感性。结果表明:力链数量先减少后增加;力链长度的概率分布曲面呈指数形式递减,短力链所占比例逐渐减少,长力链所占比例逐渐增加;力链强度表现出先减少后增加的规律;力链强度的概率分布先呈指数式上升,后呈指数式递减;四种因素对正交试验指标影响的主次顺序为CDAB;对应的最优方案为颗粒摩擦因数0.8、颗粒半径0.008 m、隔离层厚度0.004 m、隔离层界面摩擦因数0.5,此时散体介质体系在放矿过程中最为稳定。

移动AR+VR支持下跨媒体视频关键帧还原仿真

为了准确还原视频信息,针对跨媒体视频帧间保真度以及压缩比较低的问题,设计一个移动AR+VR支持下的跨媒体视频关键帧还原方法。采用SIFT方法提取跨媒体视频关键帧特征点,反复提取关键帧,构成一个关键帧集合,采用AR+VR技术按照属性与特征建立全景画面AR预测模型,校正全景图,建立匹配矩阵,匹配VR视频帧间序列,实现移动AR+VR支持下跨媒体视频关键帧还原。实验结果表明,应用该方法后,准确性、保真度以及压缩比较高,具有较好的关键帧还原效果。

Quantitative criteria for identifying main flow channels in complex porous media

To identify the type of main flow channels of complex porous media in oil and gas reservoirs,the"main flow channel index"is defined as the ratio of comprehensive permeability obtained from well test to matrix permeability obtained from core analysis or well logging.Meanwhile,a mathematical model is established based on equivalent flow assumption,the classification method for main flow channels is put forward,and quantitative characterization of main flow channels is realized.The method has been verified by analysis of typical gas reservoirs.The study results show that the"main flow channel index"can quantitatively classify types of flow channels.If the index is less than 3,the matrix pore is the main flow channel;if the index is between 3 and 20,the fracture is the main flow channel and the matrix pore acts as the supplement one;if the index is more than 20,the fracture is the only seepage channel.The dynamic analysis of typical gas reservoirs shows that the"main flow channel index"can be used to identify the type of flow channel in complex porous media,guiding the classified development of gas reservoirs,and avoiding development risk.

ON FREE WAVE PROPAGATION IN ANISOTROPIC LAYERED MEDIA

The method of reverberation-ray matrix （MRRM） is extended and modified for the analysis of free wave propagation in anisotropic layered elastic media. A general, numerically stable formulation is established within the state space framework. The compatibility of physical variables in local dual coordinates gives the phase relation, from which exponentially growing functions are excluded. The interface and boundary conditions lead to the scattering relation, which avoids matrix inversion operation. Numerical examples are given to show the high accuracy of the present MRRM.

Seismic Wave Propagation and Excitation in Multi-layered Media with Irregular Interfaces Part (Ⅰ): SH Case

Study of seismic wave excitation and propagation in laterally heterogeneous media was an active and important subject in seismology in the past two decades, numerous analytical and numerical efforts have been made in this research field. In this article, I have, first, made a brief review on those developments and then introduced and summarized a unified and efficient method, global generalized reflection-transmission (abbreviated to R/T thereafter) matrices method, for synthetic seismograms in multi-layered media with irregular interfaces developed by the author [24~26]. As demonstrated in this article, this method could be regarded as an extension of the generalized R/T coefficients method for the horizontally layered case [2,5] to the layered media with irregularly shaped interfaces by incorporating the T matrices technique [27,28]. Because of the use of a recursive scheme in computing the global generalized R/T matrices, this method is efficient, particularly for the case with a large number of

省级网络视听新媒体监测监管平台的探索与实践

网络视听新媒体的迅猛发展,为网络视听新媒体监测监管带来了更加严峻的挑战,本文以江苏在网络视听监测监管方面的具体实践为基础,介绍了江苏省网络视听新媒体监测监管平台的设计思考,讨论分析了平台架构设计、关键技术突破、数据创新应用等工作,并着重展示了江苏广电探索网络视听治理的新举措。

科技期刊私域流量建设创新探索

为推动中国学术期刊进一步适应全媒体深度融合的出版新业态,增强传播力和影响力,引入“私域流量”的概念,探索科技期刊的私域流量建设发展模式创新。分析国内科技期刊私域流量建设现状可知,传统科技期刊发展“危”和“机”并存,而基于数字营销模式创新的私域流量思维,通过读者需求的多元驱动,科技期刊传播复杂性、小众性和精准性需求的推动等,为科技期刊发展提供了新动力。但科技期刊在私域流量建设方面的实践刚刚开始探索,在内容和平台建设以及管理等方面都存在不足,为此提出科技期刊打造私域流量运营平台、加强内容建设、增强用户黏性和打造运营团队等建议,为国内科技期刊全力做好期刊精准推送与优质服务提供参考。

裂缝诱导的TTI介质固液解耦反射系数方程及裂缝和流体参数反演方法

利用地震数据进行裂缝预测及流体识别对于裂缝性储层的勘探开发具有重要意义.针对单组旋转对称的倾斜裂缝诱导的TTI介质,基于各向异性Gassmann方程,推导了固液解耦纵波反射系数近似公式,分析了不同条件下近似公式的精度.根据实际研究工区裂缝储层的特征,选用高裂缝倾角近似公式,通过奇异值分解从方位弹性阻抗中估算裂缝密度和裂缝方位,进而分离和消除各向异性项,建立流体等效体积模量及孔隙度贝叶斯反演预测方法.模型试算表明,在信噪比大于2时,流体等效体积模量、孔隙度和裂缝参数的估计较为可靠,实际应用也验证了反演方法的有效性.

基于新媒体矩阵的高校网络思想政治教育创新

新媒体矩阵的构建提升信息传播质量及信息传播效率。本文将以新媒体矩阵建设为主体,分析新媒体矩阵视角下高校网络思政教育意义及创新发展困境,并提出部分行之有效的教育创新方案,以此通过探究新媒体矩阵视角下的高校网络思政教育优势及新媒体发展对网络思政教育的影响,为未来阶段完善网络思政教育体系提供部分教育参考。

科技期刊融合转型路径探析——以北京卓众出版有限公司为例

在党中央的顶层设计和政策推动下,媒体融合发展思路日益清晰,总体规模快速增长。绝大多数科技期刊积极推进自身媒体融合之路。北京卓众出版有限公司作为科技期刊集团化发展的一个案例,探索视频IP化运营、建设垂直行业领域的大数据平台、构筑全媒体矩阵、进行整合营销等四种科技期刊可行的媒体融合路径,以期抛砖引玉供同行借鉴。