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An analytical study for detonation wave boundary layer interactions under reflections 认领 引用
1
作者 Hao YAN Xin HAN +2 位作者 Haochen XIONG Chongguang SHI Yancheng YOU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期178-201,共24页
Numerical simulations and theoretical models are developed in this paper for the Detonation-Wave/Boundary-Layer Interactions(DWBLIs)under reflections.Transient flow fields demonstrate the highly non-stationarity of th... Numerical simulations and theoretical models are developed in this paper for the Detonation-Wave/Boundary-Layer Interactions(DWBLIs)under reflections.Transient flow fields demonstrate the highly non-stationarity of the DWBLIs when Mach Reflection(MR)occur,and subsequent analyses show that the subsonic region introduced by the boundary layer exacerbates the instability.Further quantitative analyses show that viscosity has little effect on propulsive performance and the separation wave can be considered as an oblique detonation wave.Influence parameters to DWBLIs such as combustion chamber height,incoming Mach number,equivalence ratio,and inlet channel length are categorized and studied.Besides simulations,theoretical analytical modeling is established for Regular Reflection(RR)and MR of DWBLIs.Multiple formulas for the separation zone length are obtained according to the mass conservation under different transformation type between inviscid and viscid reflections.Comparison with the numerical simulations verifies the validity of the model and it can be further generalized to the curved DWBLIs.The developed model makes the theoretical solution process of DWBLIs possible and provides the key foundation for further analysis and solution. 展开更多
关键词 Boundary layer interaction Detonation wave Hypersonic flow Reflection Viscosity
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On US-admitting Reflections of T0 Spaces 认领 引用
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作者 Liqun LIN Jinbo YANG 《Journal of Mathematical Research with Applications》 CSCD 2025年第6期800-812,共13页
US-admitting spaces,which were introduced by Heckmann,enjoy many nice properties similar to those of the extensively studied well-filtered spaces.In this paper,we present a direct construction of the US-admittin... US-admitting spaces,which were introduced by Heckmann,enjoy many nice properties similar to those of the extensively studied well-filtered spaces.In this paper,we present a direct construction of the US-admitting reflections by using US-admitting determined sets. 展开更多
关键词 well-filtered space reflective subcategory sober space US-admitting space
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High-accuracy self-mixing interferometer based on multiple reflections using a simple external reflecting mirror 认领 引用 被引量：2
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作者 WANG Xiu-lin1 WEI Zheng2 +1 位作者 WANG Rui2 HUANG Wen-cai2 《Optoelectronics Letters》 EI 2018年第3期161-163,共3页
A self-mixing interferometer(SMI)with resolution twenty times higher than that of a conventional interferometer is developed by multiple reflections.Only by employing a simple external reflecting mirror,the multiple-p... A self-mixing interferometer(SMI)with resolution twenty times higher than that of a conventional interferometer is developed by multiple reflections.Only by employing a simple external reflecting mirror,the multiple-pass optical configuration can be constructed.The advantage of the configuration is simple and easy to make the light re-injected back into the laser cavity.Theoretical analysis shows that the resolution of measurement is scalable by adjusting the number of reflections.The experiment shows that the proposed method has the optical resolution of approximateλ/40.The influence of displacement sensitivity gain(G)is further analyzed and discussed in practical experiments. 展开更多
关键词 High-accuracy self-mixing interferometer mul-Liple reflections
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Reflections on Tools and Methods for Differentiated Assessments of Individual Scientists, Groups of Scientists and Scientific Journals 认领 引用 被引量：2
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作者 Ronald Rousseau Xiaolin Zhang 《Journal of Data and Information Science》 CSCD 2019年第3期1-5,共5页
Requirements for research assessments There are huge differences in mission, emphasis, inherent capability, and targeted utilization of research among scientific institutions. Hence, when it comes to assessments, a on... Requirements for research assessments There are huge differences in mission, emphasis, inherent capability, and targeted utilization of research among scientific institutions. Hence, when it comes to assessments, a one-size-fits-all approach cannot meet the goal(s) of these assessments. Probably even larger differences exist between individuals, research teams and departments. 展开更多
关键词 Reflections Tools and Methods Differentiated Assessments of Individual Scientists
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Reflections on 25 Years of Social Science Research Collaboration in China 认领 引用
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作者 Iqbal H.Shah 《Journal of Reproduction and Contraception》 2010年第4期243-250,共8页
This paper is to reflect on 25 wonderful years of my collaboration with the Chinese scientists and policy makers on social science and operations research in sexual reproductive health. Past and ongoing collaboration ... This paper is to reflect on 25 wonderful years of my collaboration with the Chinese scientists and policy makers on social science and operations research in sexual reproductive health. Past and ongoing collaboration is reviewed, followed by a discussion on the record of achievements and ideas for future directions and research priorities. The paper represents my views based on an exceptionally rich personal and professional experience working with numerous Chinese scientists on a range of research topics. 展开更多
关键词 Reflections on 25 Years of Social Science Research Collaboration in China
Characteristics of seismic reflections in central region of the South China Sea and their geological significance 认领 引用 被引量：4
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作者 刘建华 金翔龙 《Acta Oceanologica Sinica》 SCIE CAS 2000年第3期103-113,共11页
More than 4 000 km 48-channel seismic reflection data from the central region of the South China Sea have been interpreted. Five seismic interfaces have been distinguished, named T1, T2, T4, T6 and Tg respectively Mea... More than 4 000 km 48-channel seismic reflection data from the central region of the South China Sea have been interpreted. Five seismic interfaces have been distinguished, named T1, T2, T4, T6 and Tg respectively Meanwhile, five seismic sequences numbered I - V have been divided with the ages of Quaternary and Pliocene, Later Mocene, Earlier and Middle Miocene, Oligocene and Pre- Oligocene separately. Sequences I-II overlie all parts of the area. In the continental slope and island slope, Sequences III-V are mainly found in the grabens. Sequence III is found at moot profiles of the deep-sea basin, and Sequnce IV is seen not only at the margins of the east subbasin but also at the margins of the southwest subbasin. Strong reflection from Moho is found at most profiles of the deep-sea basin. The depth of Moho varies between 10 and 12 km, with a thickness of 6- 8 km for the crust. Calculated by age-basement depth correlation formula, the age of basaltic basement in the southwest subbasin is 51-39 Ma. It is indicated that the evolution of the southwest subbasin is simultaneous with or earlier than that of the east subbasin. 展开更多
关键词 Central region of the South China Sea seismic reflection,evolution of the back-arc basin
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A Free Surface Frequency Domain Green Function with Viscous Dissipation and Partial Reflections from Side Walls 认领 引用 被引量：4
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作者 Hongde Qin Jing Shen Xiaobo Chen 《Journal of Marine Science and Application》 2011年第3期259-264,共6页
The free-surface Green function method is widely used in solving the radiation or diffraction problems caused by a ship or ocean structure oscillating on the waves. In the context of inviscid potential flow, hydrodyna... The free-surface Green function method is widely used in solving the radiation or diffraction problems caused by a ship or ocean structure oscillating on the waves. In the context of inviscid potential flow, hydrodynamic problems such as multi-body interaction and tank side wall effect cannot be properly dealt with based on the traditional free-surface frequency domain Green function method, in which the water viscosity is omitted and the energy dissipation effect is absent. In this paper, an open-sea Green function with viscous dissipation was presented within the theory ofvisco-potential flow. Then the tank Green function with a partial reflection from the side walls in wave tanks was formulated as a formal sum of open-sea Green functions representing the infinite images between two parallel side walls of the source in the tank. The new far-field characteristics of the tank Green function is vitally important fur improving the validity of side-wall effects evaluation, which can be used in supervising the tank model tests. 展开更多
关键词 Green function viscous dissipation side wall effect partial reflection
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The influence of reflections from the train body and the ground on the sound radiation from a railway rail 认领 引用 被引量：1
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作者 David J.Thompson Dong Zhao +3 位作者 Evangelos Ntotsios Giacomo Squicciarini Ester Cierco Erwin Jansen 《Railway Sciences》 2024年第1期1-17,共17页
Purpose – The vibration of the rails is a significant source of railway rolling noise, often forming the dominantcomponent of noise in the important frequency region between 400 and 2000 Hz. The purpose of the paper ... Purpose – The vibration of the rails is a significant source of railway rolling noise, often forming the dominantcomponent of noise in the important frequency region between 400 and 2000 Hz. The purpose of the paper is toinvestigate the influence of the ground profile and the presence of the train body on the sound radiation fromthe rail.Design/methodology/approach – Two-dimensional boundary element calculations are used, in which therail vibration is the source. The ground profile and various different shapes of train body are introduced in themodel, and results are observed in terms of sound power and sound pressure. Comparisons are also made withvibro-acoustic measurements performed with and without a train present.Findings – The sound radiated by the rail in the absence of the train body is strongly attenuated by shieldingdue to the ballast shoulder. When the train body is present, the sound from the vertical rail motion is reflectedback down toward the track where it is partly absorbed by the ballast. Nevertheless, the sound pressure at thetrackside is increased by typically 0–5 dB. For the lateral vibration of the rail, the effects are much smaller. Oncethe sound power is known, the sound pressure with the train present can be approximated reasonably well withsimple line source directivities.Originality/value – Numerical models used to predict the sound radiation from railway rails have generallyneglected the influence of the ground profile and reflections from the underside of the train body on the soundpower and directivity of the rail. These effects are studied in a systematic way including comparisons with measurements. 展开更多
关键词 Rolling noise Sound radiation Railway track Boundary elements Ground reflections Directivity
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Reflections on “Human Rights” and “Sense of Well-being” 认领 引用
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作者 LI XIANBO XU LI 《The Journal of Human Rights》 2013年第1期8-11,共4页
Since the conceptual germina- tion of ＂human rights＂ in the modern age, the controversy over it and its connotationshave been constant. Scholars at home and abroad either attempt to interpret the connotation of huma... Since the conceptual germina- tion of ＂human rights＂ in the modern age, the controversy over it and its connotationshave been constant. Scholars at home and abroad either attempt to interpret the connotation of human rights by em- phasizing the real social foundation of human rights from a political and eco- nomic perspective, or elaborate on the essence of human rights by focusing on traditional values and dignity from the angle of cultural and moral traditions. However, because of differences in sys- tem and culture in different countries, 展开更多
关键词 and Reflections on Human Rights Sense of Well-being
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Audible Threshold of Early Reflections with Different Orientations and Delays 认领 引用
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作者 Xiaoli Zhong Wenying Guo Jie Wang 《Sound & Vibration》 EI 2018年第6期18-22,共5页
Early reflection is an important component in an enclosedsound field. Due to the precedence effect, the early reflection maynot be the dominant factor in sound source localization;however,it still has obvious influenc... Early reflection is an important component in an enclosedsound field. Due to the precedence effect, the early reflection maynot be the dominant factor in sound source localization;however,it still has obvious influences on spatial position, loudness, timbre,and etc. Till now, there have sparse studies on evaluation of theaudible threshold of early reflections with lacking of general andquantitative results. This work investigated the audible thresholdof early reflection with a simplified sound field model undervarious experimental conditions including the combination ofeight incidence angles and five time delays. Three-down-one-upadaptive strategy with three-interval three-alternativeforced-choice (3I-3AFC) paradigm was used due to its efficiencyand robustness. Results indicate that (1) the audible threshold ofearly reflections decreases monotonically with increasing timedelay relative to the direct sound. Furthermore, a linear equationbetween early reflection threshold and time delay is establishedwith correlation coefficient higher than 0.9;(2) When the directsound and the reflection locate in the same half-plane, the audiblethreshold of early reflections decreases with increasing angledeviation between the direct sound and the reflection. Moreover,a front-back symmetry of early reflection threshold is observedfor stimuli below 5 kHz;(3) Considerable variations in earlyreflection threshold are found among individuals, especially atlarge angle deviation and time delay of early reflections relativeto the direct sound. 展开更多
关键词 Audible threshold early reflection incidence angle timedelay
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English Language Education in China: Progress, Problems and Reflections 认领 引用
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作者 SHI Jia-lin 《Journal of Literature and Art Studies》 2017年第7期935-938,共4页
The thesis is aimed at putting forward to some problems existing in contemporary China＇s English teaching by showing progress made in recent years. Reflections have formed by contemplating the gaps of English teachin... The thesis is aimed at putting forward to some problems existing in contemporary China＇s English teaching by showing progress made in recent years. Reflections have formed by contemplating the gaps of English teaching with that of Asian ＆ European countries. This thesis, through a general perspective, outlines what English teachers will do to push Chinese English learning to a new level. 展开更多
关键词 China English language education reflections
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Simulating Ultrasound Reflections Using Rayleigh Integral Method in Complex Biological Media 认领 引用
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作者 MalakNasser Walid Hassan +1 位作者 Ali Hage-Diab Souheil Hakeem 《Journal of Life Sciences》 2013年第12期1288-1296,共9页
This paper exploits the Rayleigh integral method to simulate the propagation of transmitted ultrasonic waves and received echoes through various media. Performed simulations study the effect of apodization using diffe... This paper exploits the Rayleigh integral method to simulate the propagation of transmitted ultrasonic waves and received echoes through various media. Performed simulations study the effect of apodization using different types of windows and the effect of medium properties on the reflections obtained. All estimations are done using the Rayleigh integral method simplified by the Fresnel approximation. Five different interfaces are considered： tissue-bone-tissue, tissue-fat-bone, fat-muscle-bone, air-fat-bone and water-fat-bone. The apodization simulations show that the hamming window is more efficient than the rectangular and triangular windows for obtaining a more consistent beam. In the second set of simulations, reflections are mapped with respect to the depth from which these reflections are generated. It demonstrates that the solid and water media allow for the attainment of echoes from deeper regions as compared to the air medium. Matlab is used as the simulation framework. 展开更多
关键词 Ultrasound reflections Rayleigh integral apodization.
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Some Reflections on the Titles of English Majors' B.A. Theses 认领 引用
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作者 WANG Xiao-yan 《Sino-US English Teaching》 2012年第10期1568-1572,共5页
English majors＇ B.A. （Bachelor of Arts） thesis writing is an important part and test of the students＇ four-year undergraduate education. It lays solid foundation for their future study and work. Yet serious proble... English majors＇ B.A. （Bachelor of Arts） thesis writing is an important part and test of the students＇ four-year undergraduate education. It lays solid foundation for their future study and work. Yet serious problems exist during the process. The author of the paper collects and analyzes the 289 titles of English majors＇ B.A. writing in the recent two years in Changchun University, China. The results of the analysis reveal that almost 40% of the titles are on literature every year and among them there are some similar titles. In view of this situation, the author first explores the reasons that caused those problems. One of the important reasons is that the increasing of the supervisors and reference materials cannot keep the pace of the expanding of students＇ numbers. The author, after that, makes some reflections on those problems, then proposes five practical supervising strategies, and makes some relevant suggestions for English major＇s thesis writing. Meanwhile some other related problems in thesis writing in China are also discussed. 展开更多
关键词 titles English major B.A. （Bachelor of Arts） thesis reflections
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Reflections on Mona Lisa Smile From an Intercultural Perspective 认领 引用
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作者 CHEN Yan-hui 《US-China Foreign Language》 2022年第10期362-366,共5页
Mona Lisa is regarded as an archetypal masterpiece of the Italian Renaissance by Leonardo da Vinci, which indicates the advent of liberation and humanism. The famous movie Mona Lisa Smile follows the same name and not... Mona Lisa is regarded as an archetypal masterpiece of the Italian Renaissance by Leonardo da Vinci, which indicates the advent of liberation and humanism. The famous movie Mona Lisa Smile follows the same name and not only depicts women’s pursuit of self-consciousness and self-value realization, but also portrays culture shock and cultural conflict in each specific plot filled with implications, providing some unique insights into intercultural learning. This thesis tries to interpret the movie from an intercultural perspective. The intercultural reflections will be presented in terms of four aspects, namely, general impressions of the movie, Katherine’s growth and adaptation process, my reflections on the movie, and intercultural insights gained from the movie. 展开更多
关键词 Mona Lisa Smile reflections intercultural perspective cultural shock
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MUD-STONE FLOW AT YI'ONG: Reflections 认领 引用
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《China's Tibet》 EI 2000年第6期21-22,共2页
关键词 Reflections MUD-STONE FLOW AT YI’ONG AT
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Reflections on the Transformation of World Pattern and Resoonsibility Adjustment 认领 引用
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作者 王在邦 《Contemporary International Relations》 2000年第2期1-13,共13页
The year of 2000 is at the turn of the century as well as of the millennium. Themankind waves farewell to the 20th century as well as the second millenniumand welcomes the 21st century and the third millennium. At thi... The year of 2000 is at the turn of the century as well as of the millennium. Themankind waves farewell to the 20th century as well as the second millenniumand welcomes the 21st century and the third millennium. At this special juncture,looking closely at the future based on understanding which was obtained from re-viewing and summarizing the past and present world politics from historical andphilosophical standpoints, we can find that it has become an unavoidable subject onhow to regard the trend of the world pattern toward multi-polarization and respon-sibility adjustment arising from it. 展开更多
关键词 Reflections on the Transformation of World Pattern and Resoonsibility Adjustment US World
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Wahaha vs. Danone Dispute Leads to Reflections on China's FDI Policies——A Special Interview with ZONG Qinghou and Emmanuel Faber 认领 引用
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作者 叶文添 唐清建 《中国经济学人（中英文）》 2007年第6期122-131,共10页
Background: In 1996, Wahaha, Danone and BNP (Hong Kong) jointly invested in and incorporated 5 companies to manufacture Wahaha brand products, including purified water and eight-treasure porridge. Wahaha holds 49% equ... Background: In 1996, Wahaha, Danone and BNP (Hong Kong) jointly invested in and incorporated 5 companies to manufacture Wahaha brand products, including purified water and eight-treasure porridge. Wahaha holds 49% equity interests in these companies, while Danone later became the dominant shareholder with a 51% stake after acquiring shares held by BNP in the aftermath of the Asian financial crisis. Danone then proposed to transfer the Wahaha brand to a joint venture but did not succeed. Subsequently, a trademark usage contract was signed by both parties instead. In the ensuing years, the Wahaha Group established non-JV companies in west China, central China and the Three Gorges reservoir area. These companies had RMB 5.6 billion of total assets as of December 31st, 2006 and made a net income of RMB 1.04 billion in that year. On April 3rd, 2007, Danone intended to force a deal by which it could acquire 51% equity interests in those non-JV companies for a sum of RMB 4 billion. Wahaha Chairman Zong Qinghou later complained that he and Wahaha fell into a trap set up by Danone. Both parties have since engaged in a lengthy "war of words", thereby arousing a grand debate on China's FDI policies. 展开更多
关键词 A Special Interview with ZONG Qinghou and Emmanuel Faber Danone Dispute Leads to Reflections on China’s FDI Policies Wahaha vs FDI
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Reflections on 2001 Int'l Situation 认领 引用
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作者 Wang Zaibang Wang Zaibang is Assistant President and Research Professor of China Institute of Contemporary International Relations. 《Contemporary International Relations》 2002年第1期15-36,共22页
The first year of the new century witnessed volatility, reflections, readjustment and opportunities in the world. The international situation became even tenser, thereby exerting a great impact on the security and str... The first year of the new century witnessed volatility, reflections, readjustment and opportunities in the world. The international situation became even tenser, thereby exerting a great impact on the security and strategic conception of world major powers, and pushing them to readjust 展开更多
关键词 Reflections on 2001 Int’l Situation ABM
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Reflections on China's Neighboring Security Environment 认领 引用
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作者 Dao Shulin 《Contemporary International Relations》 2002年第12期27-32,共6页
There is a Chinese saying that goes like this, when stormy weather comes, a giant dragon will rise. It is the feature of the present era. When China begins to rise, it will advance at an enormous inertial force. It ha... There is a Chinese saying that goes like this, when stormy weather comes, a giant dragon will rise. It is the feature of the present era. When China begins to rise, it will advance at an enormous inertial force. It has become the important factor that influences world future trend. In the meanwhile, changes in international situation also exerted increasing influence on China. Therefore it is of special significance to discuss and assess the international environment that China faces. 展开更多
关键词 Security Reflections on China’s Neighboring Security Environment
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Reflections on Sino-Russian Strategic Partnership 认领 引用
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作者 冯玉军 《Contemporary International Relations》 1998年第8期1-10,共10页
China and Russia announced“their resolve to develope a strategic partnership ofequality.mutual confidence and mutual coordination toward the 21stcentury" during President Yeltsin’s China visit in April 1996。 T... China and Russia announced“their resolve to develope a strategic partnership ofequality.mutual confidence and mutual coordination toward the 21stcentury" during President Yeltsin’s China visit in April 1996。 The partnership represents a new type of slate-to-state relations based on e-quality and mutual confidence.It aims at safeguarding each other’s national inter-ests and building a fair,just international political and economic order.It is charac- 展开更多
关键词 Reflections on Sino-Russian Strategic Partnership
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