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Numerical Study of a Three-Dimensional Laminar Flow in a Rectangular Channel with a 180-Degree Sharp Turn
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作者 Takashi Yoshida 《Open Journal of Fluid Dynamics》 2024年第3期147-162,共16页
This study presents a numerical analysis of three-dimensional steady laminar flow in a rectangular channel with a 180-degree sharp turn. The Navier-Stokes equations are solved by using finite difference method for Re ... This study presents a numerical analysis of three-dimensional steady laminar flow in a rectangular channel with a 180-degree sharp turn. The Navier-Stokes equations are solved by using finite difference method for Re = 900. Three-dimensional streamlines and limiting streamlines on wall surface are used to analyze the three-dimensional flow characteristics. Topological theory is applied to limiting streamlines on inner walls of the channel and two-dimensional streamlines at several cross sections. It is also shown that the flow impinges on the end wall of turn and the secondary flow is induced by the curvature in the sharp turn. 展开更多
关键词 180-Degree Sharp Turn Channel Three Dimensional Steady Flow Limiting Streamline Topological Theory
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Theory of Flexural Shear, Bending and Torsion for a Thin-Walled Beam of Open Section
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作者 David W. A. Rees Abdelraouf M. Sami Alsheikh 《World Journal of Mechanics》 2024年第3期23-53,共31页
Aspects of the general Vlasov theory are examined separately as applied to a thin-walled channel section cantilever beam under free-end end loading. In particular, the flexural bending and shear that arise under trans... Aspects of the general Vlasov theory are examined separately as applied to a thin-walled channel section cantilever beam under free-end end loading. In particular, the flexural bending and shear that arise under transverse shear and axial torsional loading are each considered theoretically. These analyses involve the location of the shear centre at which transverse shear forces when applied do not produce torsion. This centre, when taken to be coincident with the centre of twist implies an equivalent reciprocal behaviour. That is, an axial torsion applied concentric with the shear centre will twist but not bend the beam. The respective bending and shear stress conversions are derived for each action applied to three aluminium alloy extruded channel sections mounted as cantilevers with a horizontal principal axis of symmetry. Bending and shear are considered more generally for other thin-walled sections when the transverse loading axes at the shear centre are not parallel to the section = s centroidal axes of principal second moments of area. The fixing at one end of the cantilever modifies the St Venant free angular twist and the free warping displacement. It is shown from the Wagner-Kappus torsion theory how the end constrained warping generates an axial stress distribution that varies with the length and across the cross-section for an axial torsion applied to the shear centre. It should be mentioned here for wider applications and validation of the Vlasov theory that attendant papers are to consider in detail bending and torsional loadings applied to other axes through each of the centroid and the web centre. Therein, both bending and twisting arise from transverse shear and axial torsion applied to each position being displaced from the shear centre. Here, the influence of the axis position upon the net axial and shear stress distributions is to be established. That is, the net axial stress from axial torsional loading is identified with the sum of axial stress due to bending and axial stress arising from constrained warping displacements at the fixing. The net shear stress distribution overlays the distributions from axial torsion and that from flexural shear under transverse loading. Both arise when transverse forces are displaced from the shear centre. 展开更多
关键词 Thin Wall Theory Cantilever Beam Open Channel Section Principal Axes Flexure Transverse Shear TORSIon Shear Centre Shear Flow WARPING Fixed-End Constraint
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Quantitative description of characteristics of high-capacity channels in unconsolidated sandstone reservoirs using in situ production data 被引量:15
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作者 Wang Xuezhong Wang Jianyong +2 位作者 Wang Chuanfei Zeng Liufang Liu Xuewei 《Petroleum Science》 SCIE CAS CSCD 2010年第1期106-111,共6页
Quantitative description of the high-capacity channels in unconsolidated sandstone reservoirs, into which water was injected to improve oil recovery, is a hot topic in the field of reservoir development. This paper pr... Quantitative description of the high-capacity channels in unconsolidated sandstone reservoirs, into which water was injected to improve oil recovery, is a hot topic in the field of reservoir development. This paper presents a novel approach to describing quantitatively the characteristics of connected macropores in unconsolidated sandstone reservoirs using in situ production data. Based on physical simulation for formation mechanisms of high capacity channels and interwell tracer test data, a mathematical model was established to describe high-capacity channels by grey correlation theory, flow mechanism of fluid in porous media and reservoir engineering, and a program was developed to describe quantitatively the channel characteristics. The predicted results were consistent with field monitoring data (80%), so this model could be economically and effectively used to identify high-capacity channels. 展开更多
关键词 High-capacity channel unconsolidated sandstone quantitative description physical simulation interwell tracer grey correlation theory
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Application of BDRM Theory in the Two-AXIS Underwater Channel 被引量:1
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作者 张林 笪良龙 卢晓亭 《Marine Science Bulletin》 CAS 2007年第2期12-17,共6页
Two-axis underwater channel often exists in deep ocean. Because of the coupling between surface channel and SOFAR channel, sound propagation in the two-axis underwater channel is complex and so its calculations of aco... Two-axis underwater channel often exists in deep ocean. Because of the coupling between surface channel and SOFAR channel, sound propagation in the two-axis underwater channel is complex and so its calculations of acoustic fields are difficult. The beam-displacement ray-mode (BDRM) theory is a normal mode method for propagation modeling in the common horizontally stratified shallow water. We improve the theory, proposing a new method for computing the upper boundary reflection coefficient, and apply it to calculate the acoustic fields of two-axis underwater channel. Transmission losses in the two-axis underwater channel are calculated by the BDRM theory. The results are in good agreement with the KRAKEN code and the computational speed excels those of the other methods. 展开更多
关键词 two-axis underwater channel BDRM theory reflection coefficient phase-shift correction
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The Theory of Field-Effect Transistors:XI. The Bipolar Electrochemical Currents(1-2-MOS-Gates on Thin-Thick Pure-Impure Base)
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作者 薩支唐 揭斌斌 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第3期397-409,共13页
The field-effect transistor is inherently bipolar, having simultaneously electron and hole surface and volume channels and currents. The channels and currents are controlled by one or more externally applied transvers... The field-effect transistor is inherently bipolar, having simultaneously electron and hole surface and volume channels and currents. The channels and currents are controlled by one or more externally applied transverse electric fields. It has been known as the unipolar field-effect transistor for 55-years since Shockley's 1952 invention,because the electron-current theory inevitably neglected the hole current from over-specified internal and boundary conditions, such as the electrical neutrality and the constant hole-electrochemical-potential, resulting in erroneous solutions of the internal and terminal electrical characteristics from the electron channel current alone, which are in gross error when the neglected hole current becomes comparable to the electron current, both in subthreshold and strong inversion. This report presents the general theory, that includes both electron and hole channels and currents. The rectangular ( x, y, z) parallelepiped transistors,uniform in the width direction (z-axis),with one or two MOS gates on thin and thick,and pure and impure base, are used to illustrate the two-dimensional effects and the correct internal and boundary conditions for the electric and the electron and hole electrochemical potentials. Complete analytical equations of the DC current-voltage characteristics of four common MOS transistor structures are derived without over-specification: the 1-gate on semi-infinite-thick impure-base (the traditional bulk transistor), the 1-gate on thin impure-silicon layer over oxide-insulated silicon bulk (SOI) ,the 1-gate on thin impure-silicon layer deposited on insulating glass (SOI TFT), and the 2-gates on thin pure-base (FinFETs). 展开更多
关键词 bipolar field-effect transistor theory MOS field-effect transistor simultaneous electron and hole surface and volume channels and currents surface potential two-section short-channel theory double-gate impure-base theory
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Joint Design of Coalition Formation and Semi-Blind Channel Estimation in Fog Radio Access Networks 被引量:3
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作者 Zhifeng Wang Feifan Yang +3 位作者 Shi Yan Saleemullah Memon Zhongyuan Zhao Chunjing Hu 《China Communications》 SCIE CSCD 2019年第11期1-15,共15页
Coordinated signal processing can obtain a huge transmission gain for Fog Radio Access Networks(F-RANs).However,integrating into large scale,it will lead to high computation complexity in channel estimation and spectr... Coordinated signal processing can obtain a huge transmission gain for Fog Radio Access Networks(F-RANs).However,integrating into large scale,it will lead to high computation complexity in channel estimation and spectral efficiency loss in transmission performance.Thus,a joint cluster formation and channel estimation scheme is proposed in this paper.Considering research remote radio heads(RRHs)centred serving scheme,a coalition game is formulated in order to maximize the spectral efficiency of cooperative RRHs under the conditions of balancing the data rate and the cost of channel estimation.As the cost influences to the necessary consumption of training length and estimation error.Particularly,an iterative semi-blind channel estimation and symbol detection approach is designed by expectation maximization algorithm,where the channel estimation process is initialized by subspace method with lower pilot length.Finally,the simulation results show that a stable cluster formation is established by our proposed coalition game method and it outperforms compared with full coordinated schemes. 展开更多
关键词 channel estimation CLUSTER formation GAME theory FOG RADIO ACCESS networks(F-RANs)
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Power Control for Fading Channels in Cognitive Radio Networks with Outage-Probability Minimization 被引量:4
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作者 Luan Yu Li Hongzuo Wang Yafei 《China Communications》 SCIE CSCD 2012年第12期108-116,共9页
Cognitive radio allows Secondary Users (SUs) to dynamically use the spectrum resource licensed to Prirmry Users (PUs), and significantly improves the efficiency of spectrum utilization and is viewed as a promising... Cognitive radio allows Secondary Users (SUs) to dynamically use the spectrum resource licensed to Prirmry Users (PUs), and significantly improves the efficiency of spectrum utilization and is viewed as a promising technology. In cognitive radio networks, the problem of power control is an important issue. In this paper, we mainly focus on the problem of power control for fading channels in cognitive radio networks. The spectrum sharing underlay scenario is considered, where SUs are allowed to coexist with PUs on the condition that the outage probability of PUs is below the maximum outage probability threshold limitation due to the interference caused by SUs. Moreover, besides the outage probability threshold which is defined to protect the performance of PUs, we also consider the maximum transmit power constraints for each SU. With such a setup, we emphasize the problem of power control to minimize the outage probability of each SU in fading channels. Then, based on the statistical information of the fading channel, the closed expression for outage probability is given in fading channels. The Dual-Iteration Power Control (DIPC) algorithm is also proposed to minimize the outage probability based on Perron-Frobenius theory and gradient descent method under the constraint condition. Finally, simulation results are illustrated to demonstrate the performance of the proposed scheme. 展开更多
关键词 cognitive radio power control outage probability Perron-Frobenius theory fading channel
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MDL-based root-mean-squared delay spread estimation for MIMO OFDM systems
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作者 徐晓东 井雅 尤肖虎 《Journal of Southeast University(English Edition)》 EI CAS 2004年第4期395-400,共6页
This paper studied the application of minimum description length (MDL) criterion for estimating root-mean-squared (RMS) delay spread (RDS) for MIMO OFDM systems. The analytic relationship between the powers and the co... This paper studied the application of minimum description length (MDL) criterion for estimating root-mean-squared (RMS) delay spread (RDS) for MIMO OFDM systems. The analytic relationship between the powers and the correlation matrix of multipath components established the feasibility of the application of the MDL criterion to RDS estimation. The estimator presented both the estimate of instantaneous RDS and the estimates of noise variance, channel power and SNR of current channel with low computational complexity. Given the powers of the estimated multipath components, the MDL criterion was adopted to acquire the number of paths and the time delays of each path of current channel without making eigendecomposition of the correlation matrix normally required by MDL criterion, following which the noise variance and the power of each path can be estimated. The power delay profile (PDP) and RDS of the current channel were achieved. Simulation results showed that the proposed estimator was insensitive to variance of SNR and robust against frequency-selectivity. 展开更多
关键词 Communication channels (information theory) Delay control systems Fading (radio) Robustness (control systems) Signal processing Wireless telecommunication systems
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Subthreshold behavior of AlInSb/InSb high electron mobility transistors 被引量:1
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作者 S.Theodore Chandra N.B.Balamurugan +1 位作者 G.Lakshmi Priya S.Manikandan 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第7期360-364,共5页
We propose a scaling theory for single gate Al In Sb/In Sb high electron mobility transistors(HEMTs) by solving the two-dimensional(2D) Poisson equation. In our model, the effective conductive path effect(ECPE) ... We propose a scaling theory for single gate Al In Sb/In Sb high electron mobility transistors(HEMTs) by solving the two-dimensional(2D) Poisson equation. In our model, the effective conductive path effect(ECPE) is taken into account to overcome the problems arising from the device scaling. The potential in the effective conducting path is developed and a simple scaling equation is derived. This equation is solved to obtain the minimum channel potential Φdeff,minand the new scaling factor α to model the subthreshold behavior of the HEMTs. The developed model minimizes the leakage current and improves the subthreshold swing degradation of the HEMTs. The results of the analytical model are verified by numerical simulation with a Sentaurus TCAD device simulator. 展开更多
关键词 scaling theory subthreshold behavior effective conducting path effect short channel effect
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Capacity analysis of high-rank line-of-sight MIMO channels 被引量:1
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作者 Xiao Hailin Ouyang Shan +1 位作者 Nie Zaiping Zhao Feng 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2009年第4期706-710,共5页
Matrix perturbation theory is utilized to investigate high-rank line of sight multiple input multiple output channels in a microwave relay system. The upper and lower bounds of channel capacity are derived based on sp... Matrix perturbation theory is utilized to investigate high-rank line of sight multiple input multiple output channels in a microwave relay system. The upper and lower bounds of channel capacity are derived based on space time block codes technique and singular values decomposition. A useful constraint for designing LOS MIMO channels is developed by the use of the condition number of the MIMO channel matrix. The theoretical analysis of channel capacity is confirmed by the simulation. The results show that the proposed method is able to give a physical explanation of the high-rank LOS MIMO channel matrix characteristics. 展开更多
关键词 MIMO channel matrix perturbation theory condition number space time block code
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Wideband Modeling of Land-Mobile-Satellite Channel in Built-Up Environment 被引量:1
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作者 Anwar Jarndal Mohammed S. Al Salameh +1 位作者 Anwar Alsaqaf Yousef Hulba 《Journal of Electromagnetic Analysis and Applications》 2012年第3期101-107,共7页
This paper presents a propagation model for land-mobile-satellite (LMS) wideband radio channel in built-up environment. The model characterizes the behavior of the radio channel, under shadowing and multipath effects ... This paper presents a propagation model for land-mobile-satellite (LMS) wideband radio channel in built-up environment. The model characterizes the behavior of the radio channel, under shadowing and multipath effects due to buildings, with variation of the elevation angle of the satellite. The wideband parameters (coherent bandwidth and time delay spreading) for LMS channel, in residential and urban environments, are computed. These parameters can be considered as a measure of the amount of ISI (inter-symbol interference) of the radio channel, which distorts the received signal and accordingly increases the bit error rate. The calculated values for these parameters using our model, show very good agreement with the corresponding measured ones, which accordingly shows the validity of the developed model for radio channel design in satellite mobile communication systems. 展开更多
关键词 Radio Channel Modeling Electromagnetic Wave Propagation Satellite MOBILE Communication RAY TRACING UNIFORM Theory of DIFFRACTIon
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Jump-Dealing and Resale Price Maintenance:An Offsetting Theory and Its Policy Implications 被引量:1
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作者 于立 冯博 徐志伟 《China Economist》 2014年第3期115-125,共11页
Resale price maintenance(RPM) exerts both positive and negative influences on the market competition.Such duality and the consequent difficulties in presenting evidence have often become highly controversial issues in... Resale price maintenance(RPM) exerts both positive and negative influences on the market competition.Such duality and the consequent difficulties in presenting evidence have often become highly controversial issues in anti-monopoly law enforcement.We found that in reality,effects of jump-dealing and RPM can offset each other.This paper systematically proposed the offsetting theory of jump-dealing and RPM,and analyzed their policy implications for anti price monopoly,thus providing some simple principles and methods to the law enforcement against vertical price monopoly.This will not only reduce the possible "superfluous actions " in current law enforcement,but also help avoid compounded mistakes due to difficulties of enforcement. 展开更多
关键词 offsetting theory resale price maintenance (RPM) jump-dealing (JD) price ce in distribution channels (PD) price monopoly
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A Statistical Theory of Language Translation Based on Communication Theory 被引量:1
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作者 Emilio Matricciani 《Open Journal of Statistics》 2020年第6期936-997,共62页
We propose the first statistical theory of language translation based on communication theory. The theory is based on New Testament translations from Greek to Latin and to other 35 modern languages. In a text translat... We propose the first statistical theory of language translation based on communication theory. The theory is based on New Testament translations from Greek to Latin and to other 35 modern languages. In a text translated into another language</span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">,</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> all linguistic variables do numerically change. To study the chaotic data that emerge, we model any translation as a complex communication channel affected by “noise”, studied according to Communication Theory applied for the first time to this channel. This theory deals with aspects of languages more complex than those currently considered in machine translations. The input language is the “signal”, the output language is a “replica” of the input language, but largely perturbed by noise, indispensable, however, for conveying the meaning of the input language to its readers</span></span></span><span><span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><b><span style="font-family: Verdana;" cambria="" math","serif";"="">.</span></b></span></span><span style="font-family:""></span><span><span><span style="font-family:""><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">We have defined a noise-to-signal power ratio and found that channels are differently affected by translation noise. Communication channels are also characterized by channel capacity. The translation of novels has more constraints than the New Testament translations. We propose a global readability formula for alphabetical languages, not available for most of them, and conclude with a general theory of language translation which shows that direct and reverse channels are not symmetric. The general theory can also be applied to channels of texts belonging to the same language both to study how texts of the same author may have changed over time, or to compare texts of different authors. In conclusion, a common underlying mathematical structure governing human textual/verbal communication channels seems to emerge. Language does not play the only role in translation;this role is shared with reader’s reading ability and short-term</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">memory capacity. Different versions of New Testament within the same language can even seem, mathematically, to belong to different languages. These conclusions are everlasting because valid also for ancient Roman and Greek readers. 展开更多
关键词 Channel Capacity Communication Theory GREEK LATIN Linguistic Variables Modern Languages New Testament Noise-to-Signal Power Ratio Readability Index Short-Term Memory Capacity Symmetry
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Biexponential distribution of open times of a toy channel model
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作者 李翔 钟金金 +3 位作者 高学娟 吴宇宁 帅建伟 祁宏 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第12期41-47,共7页
The biexponential distributions of open times are observed in various types of ion channels. In this paper, by discussing a simple channel model, we show that there are two different schemes to understand the biexpone... The biexponential distributions of open times are observed in various types of ion channels. In this paper, by discussing a simple channel model, we show that there are two different schemes to understand the biexponential distribution of open times. One scheme is mathematically strict based on generator matrix theory, while the other one has a clear physical explanation according to an approximation process with numerical simulation of Markovian channel dynamics. Our comparison results suggest that even for biologically complex channels, in addition to carrying out a stochastic simulation, the strict theoretical analysis should be considered to understand the multiple exponential distributions of open times. 展开更多
关键词 ion channel biexponential distribution generator matrix theory Markovian simulation
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Analytical solutions for transverse distributions of stream-wise velocity in turbulent flow in rectangular channel with partial vegetation
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作者 槐文信 耿川 +1 位作者 曾玉红 杨中华 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2011年第4期459-468,共10页
The theory of poroelasticity is introduced to study the hydraulic properties of the steady uniform turbulent flow in a partially vegetated rectangular channel. Plants are assumed as immovable media. The resistance cau... The theory of poroelasticity is introduced to study the hydraulic properties of the steady uniform turbulent flow in a partially vegetated rectangular channel. Plants are assumed as immovable media. The resistance caused by vegetation is expressed by the theory of poroelasticity. Considering the influence of a secondary flow, the momentum equation can be simplified. The momentum equation is nondimensionalized to obtain a smooth solution for the lateral distribution of the longitudinal velocity. To verify the model, an acoustic Doppler velocimeter (ADV) is used to measure the velocity field in a rectangular open channel partially with emergent artificial rigid vegetation. Comparisons between the measured data and the computed results show that the method can predict the transverse distributions of stream-wise velocities in turbulent flows in a rectangular channel with partial vegetation. 展开更多
关键词 theory of poroelasticity open channel flow VEGETATIon secondary current depth-averaged velocity distribution
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Mechanisms and Kinetics of Radical Reaction of O(^1D,^3P) + HCN System
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作者 黄玉成 杜金艳 +2 位作者 居学海 叶世勇 周涛 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2008年第4期437-444,共8页
The reaction of HCN with O(^1D, ^3p) radical has been investigated by density functional theory (DFT) and ab initio methods. The stationary points on the reaction paths (reactants, intermediates and products) we... The reaction of HCN with O(^1D, ^3p) radical has been investigated by density functional theory (DFT) and ab initio methods. The stationary points on the reaction paths (reactants, intermediates and products) were optimized at the (U)B3LYP/aug-cc-pVTZ level. Single-point calculations were performed at the (U)QCISD(T)/aug-cc-pVTZ level for the optimized structures and all the total energies were corrected by zero-point energy. It is shown that there exist three competing mechanisms of oxygen attacking nitrogen O→N, oxygen attacking carbon O→C and oxygen attacking hydrogen O→H. The rate constants were obtained via Eyring transition-state theory in the temperature range of 600~2000 K. The linear relationship between lnk and 1/T was presented. The results show that path 1 is the main reaction channel and the product of NCO + H is predominant. 展开更多
关键词 density functional theory reaction channel radical reaction mechanism and kinetics HCN O
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A Simple Superresolution Approach of Multipath Delay Profiles Measured by PN Correlation Method
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作者 唐敖 倪滨 龚克 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2001年第4期13-16,共4页
Time resolution of multipath delay profiles measured by using autocorrelation of pseudonoise (PN) code sequence is generally limited by the chip rate of the PN code sequence. In this paper, we propose a simple method ... Time resolution of multipath delay profiles measured by using autocorrelation of pseudonoise (PN) code sequence is generally limited by the chip rate of the PN code sequence. In this paper, we propose a simple method to improve the time resolution of delay profiles measured by the PN correlation method. Effectiveness of this method is demonstrated by indoor wireless propagation experiments. 展开更多
关键词 Communication channels (information theory) ConVOLUTIon Correlation methods Radio communication Signal distortion Spurious signal noise
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Analysis of the Navier-Stokes Equations
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作者 Helmut Martin 《Journal of Applied Mathematics and Physics》 2014年第10期938-947,共10页
The Navier-Stokes equations for incompressible fluid flows with impervious boundary and free surface are analyzed by means of a perturbation procedure involving dimensionless variables and a dimensionless perturbation... The Navier-Stokes equations for incompressible fluid flows with impervious boundary and free surface are analyzed by means of a perturbation procedure involving dimensionless variables and a dimensionless perturbation parameter which is composed of kinematic viscosity of fluid, the acceleration of gravity and a characteristic length. The new dimensionless variables are introduced into the equation system. In addition, the perturbation parameter is introduced into terms for deriving approximations systems of different orders. Such systems are obtained by equating coefficients of like powers of perturbation parameter for the successive coefficients in the series. In these systems several terms are analyzed with regards to size and significance. Based on those systems, suitable solutions of NS equations can be found for different boundary conditions. For example, a relation for stationary channel flow is obtained as approximation to the NS equations of the lowest order after transformation back to dimensional variables. 展开更多
关键词 NAVIER-STOKES Equations INCOMPRESSIBLE FLOW PERTURBATIon Theory STATIonARY Open Channel FLOW
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Have We Really Embraced “The Start of an Exciting New Journey”?: A Content Analysis of the Olympic Channel’s Original Series
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作者 XU Mingming Yangchen Dolma 《Journalism and Mass Communication》 2019年第5期223-234,共12页
After the 2016 Rio Olympics,the Olympic Channel was launched on 21 August,which is a multi-platform media providing a wide range of content about the Olympics in order to promote the Olympic spirit throughout the worl... After the 2016 Rio Olympics,the Olympic Channel was launched on 21 August,which is a multi-platform media providing a wide range of content about the Olympics in order to promote the Olympic spirit throughout the world,including games,news,originals series,and live sports events.Compared with videos,the other part of the Channel,those from the original series could represent the coverage tendencies of the platform more relevantly.Based on framing theory,this research focused on issues of sports and analyzed 653 Original Series videos from 21 August 2016 to 31 December 2017,aiming to explore if the coverage framework the Olympic Channel constructed is distinct from what traditional Olympic media adhere to.The study found that some tendencies of the coverage of the Olympic Channel vary from traditional sports media.First,the most-mentioned five sports in the Channel(track and field,skiing,swimming,basketball,and gymnastics)are different from those in traditional sports media(gymnastics,track and field,swimming,diving,and volleyball).Second,the Olympic Channel emphasizes more on promotion of the Olympic humanistic spirits rather than competition,which is valued in traditional sports media,and the Channel implements the promotion greatly by telling characters’stories,with nearly 60%of those characters which are non-Olympic champions,including coaches and sports instructors involved in Olympic movements.Third,the Original Series records athletes in a documentary way,with the shooting perspectives extended from ordinary athletes’performance insides the domain,to their multiple identities’outsides the field,conveying the images of athletes vividly and solidly,narrowing the gap between athletes and fans.In terms of gender,however,male athletes and men’s sports(46.3%)have superiority of media coverage over females and female sports.Coverage focuses placed in these two genders were found distinct as well—male athletes are endowed with more opportunities to show their athletic abilities and games experiences.As for the of athletes’nationalities,it has not been completely free from the stereotypes of traditional Olympic coverage yet—developed countries account for almost about 70%of the coverage while less than 24%is of developing countries.Such unbridgeable gap will lead the perception of sports among countries imbalanced with different economic levels and may eventually have the promotion of Olympic spirits uneven.The Olympic Channel is the International Olympic Committee’s first step to change the media environment,attempting to secure the young generations’understanding towards Olympic spirits.Placing the overall amount of coverage in a global context,how to enable the Olympic Channel as the primary medium for young people globally to embrace the Olympic spirits requires International Olympic Committee (IOC) to focus more on the content and propensity of the Channel. Not only a transformationof Olympic media format, but also the “decentralization” of Olympic cultural is needed, just what the significanceof the Olympic Channel’s establishment lies in. 展开更多
关键词 the OLYMPIC Channel Media FRAMING Theory gender NATIonALITY
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Nonlinear excitation of a geodesic acoustic mode by reversed shear Alfvén eignemodes
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作者 Yahui WANG Tao WANG +1 位作者 Shizhao WEI Zhiyong QIU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第2期57-61,共5页
The parametric decay process of a reversed shear Alfvén eigenmeode(RSAE)into a geodesic acoustic mode and a kinetic RSAE is investigated using nonlinear gyrokinetic theory.The excitation conditions mainly require... The parametric decay process of a reversed shear Alfvén eigenmeode(RSAE)into a geodesic acoustic mode and a kinetic RSAE is investigated using nonlinear gyrokinetic theory.The excitation conditions mainly require the pump RSAE amplitude to exceed a certain threshold,which could be readily satisfied in burning plasmas operated in steady-state advanced scenario.This decay process can contribute to thermal plasma heating and confinement improvement. 展开更多
关键词 reversed shear Alfvén eigenmode geodesic acoustic mode gyrokinetic theory nonlinear mode coupling burning plasmas alpha channelling
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