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Preserved amplitude migration based on the one way wave equation in the angle domain 被引量:5
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作者 叶月明 李振春 +2 位作者 徐秀刚 朱绪峰 仝兆岐 《Applied Geophysics》 SCIE CSCD 2009年第1期50-58,103,共10页
Traditional pre-stack depth migration can only provide subsurface structural information. However, simple structure information is insufficient for petroleum exploration which also needs amplitude information proporti... Traditional pre-stack depth migration can only provide subsurface structural information. However, simple structure information is insufficient for petroleum exploration which also needs amplitude information proportional to reflection coefficients. In recent years, pre-stack depth migration algorithms which preserve amplitudes and based on the one- way wave equation have been developed. Using the method in the shot domain requires a deconvolution imaging condition which produces some instability in areas with complicated structure and dramatic lateral variation in velocity. Depth migration with preserved amplitude based on the angle domain can overcome the instability of the one-way wave migration imaging condition with preserved amplitude. It can also offer provide velocity analysis in the angle domain of common imaging point gathers. In this paper, based on the foundation of the one-way wave continuation operator with preserved amplitude, we realized the preserved amplitude prestack depth migration in the angle domain. Models and real data validate the accuracy of the method. 展开更多
关键词 Preserved amplitude prestack depth migration angle domain one way wave equation imaging conditions
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Seismic facies response of tectonics and direction of block movement in the northeastern South China Sea 被引量:1
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作者 陈洁 钟广见 刘少华 《Applied Geophysics》 SCIE CSCD 2010年第4期306-314,399,共10页
The close relationship between the structure,evolution,and resources environment of the South China Sea is a current research focus and also a focal point of our study.In this paper,we use regional seismic sections to... The close relationship between the structure,evolution,and resources environment of the South China Sea is a current research focus and also a focal point of our study.In this paper,we use regional seismic sections to analyze the relationship between seismic facies and the structure and tectonic evolution of the northeastern South China Sea and propose new points about the structure and the direction of block(land mass) motion.First,the tectonic features are clear and can be divided into five different structural units which are both linked and independent of each other.Second,it doesn't matter if the South China Sea basin pattern is extensional,weakly compressive,or strongly compressive,the regional tectonic stress field is unified.For the first time we find that two shallow subduction zones are recognized in the seismic profiles.All the tectonic blocks have accordion-fold-style structures,converging in the east,and the South China Sea exhibits different stages of basin development:growth, maturity,end,and termination.The block subduction and regional block dip directions are all aligned with the regional stress field. 展开更多
关键词 Sea-floor spreading SCS shallow subduction one way drifting extrusion metamorphism accordion-style seismic facies
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The Impact of the Earth’s Movement through the Space on Measuring the Velocity of Light 被引量:1
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作者 Miloš Čojanović 《Journal of Applied Mathematics and Physics》 2016年第6期1168-1178,共11页
Goal of this experiment is basically measuring the velocity of light. As usual we will measure two-way velocity of light (from A to B and back). In contrast to the similar experiments we will not assume that speeds of... Goal of this experiment is basically measuring the velocity of light. As usual we will measure two-way velocity of light (from A to B and back). In contrast to the similar experiments we will not assume that speeds of light from A to B and from B to A are equal. To achieve this we will take into account Earth’s movement through the space, rotation around its axis and apply “least squares method for cosine function”, which will be explained in Section 9. Assuming that direction East-West is already known, one clock, a source of light and a mirror, is all equipment we need for this experiment. 展开更多
关键词 Speed of Light one way Speed of Light Least Squares Method for Cosine Function
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Spin plasmonics in magnetism
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作者 徐少达 林志方 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第11期33-50,共18页
We discuss a new class of phenomena that we call "spin plasmonics". It is motivated by three different recent trends of physics research: (i) spintronics, (ii) plasmonics, and (iii) topological properties as ... We discuss a new class of phenomena that we call "spin plasmonics". It is motivated by three different recent trends of physics research: (i) spintronics, (ii) plasmonics, and (iii) topological properties as is exemplified by the quantized Hall effect. This involves the physics of the "magnetic surface plasmon" (MSP) which provides for an analog of the edge states discussed in the quantized Hall effect. Their properties can be easily tuned by an external magnetic field. They are coupled to the electromagnetic field and can be injected into metallic structures and induce spin and charge currents and hold the promise of miniturization of nonreciprocal devices. 展开更多
关键词 SPIN PLASMONICS MAGNETISM one way
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Transmutation Scheme of Coin Flipping Protocol and Utilization
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作者 XIE Yumin MING Yang +1 位作者 SHI Feng MUHAMMAD Kamran 《Wuhan University Journal of Natural Sciences》 CAS 2006年第6期1911-1914,共4页
Coin flipping by telephone protocol(CFP) is utilized in a system to exchange a binary sequence at random between two person apart far from each other. However, CFP cannot he used in a system with many users like in ... Coin flipping by telephone protocol(CFP) is utilized in a system to exchange a binary sequence at random between two person apart far from each other. However, CFP cannot he used in a system with many users like in a group environment system. A transmutation of CFP named T-CFP is proposed in this paper. The precondition of T-CFP is the system's user trusts the system center and center's cheating is meaningless at the same time. The significant difference between CFP and T-CFP is that CFP supports only two users while T-CFP can support many users to exchange special information. The security and efficiency of T-CFP are discussed with a detailed example on T-CFP utilization is demonstrated in this paper. 展开更多
关键词 coin flipping protocol transmutation-coin flipping protocol one way function Blum
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Multi-Seed Key Distribution Scheme Test
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作者 XIE Yumin SHI Feng +2 位作者 MING Yang Muhammad Kamran YANG Xiaoxu 《Wuhan University Journal of Natural Sciences》 CAS 2006年第5期1243-1248,共6页
The key problem of securing multieast is to generate, distribute and update Session Encryption Key(SEK). Polynomial expansion with multi-seed (MPE) scheme is an approach which is based on Polynomial expansion (PE... The key problem of securing multieast is to generate, distribute and update Session Encryption Key(SEK). Polynomial expansion with multi-seed (MPE) scheme is an approach which is based on Polynomial expansion (PE) scheme and overcomes PE's shortage. Its operation is demonstrated by using multi-seed, the group member is partitioned to many subgroups. While updating the SEK, computation is needed only in one of subgroups, the other of them will use the computation history to update their SEK. The key problems to design a MPE scheme application includes to find a feasible one way function as well as to generate a Strict Prime Number (SPN). Those technologies with multi-seed and computation history concepts make MPE as a good choice in practical applications. A prototype test system is designed and solutions of all above mentioned problems are included in this proposed paper. 展开更多
关键词 polynomial expansion with multi-seed(MPE) multi seed one way function strict prime number(SPN)
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The Impact of the Earth’s Movement through the Space on Measuring the Velocity of Light(Part Two)
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作者 Milos Cojanovic 《Journal of Applied Mathematics and Physics》 2017年第3期741-757,共17页
In this paper is presented an experiment that has a goal to measure the speed of light in one direction, using one clock and one mirror. To achieve this, we have to make the measurements during the period of one year ... In this paper is presented an experiment that has a goal to measure the speed of light in one direction, using one clock and one mirror. To achieve this, we have to make the measurements during the period of one year (nine months at least), taking into account earth’s movement through the space, earth’s rotation around its axis and the fact that earth spin axis is tilted with respect to the plane of its orbit of the sun. 展开更多
关键词 Speed of Light one way Speed of Light Absolute Velocity of the Earth
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SIMULATION OF REGIONAL CLIMATE OVER CHINA WITH CHINESE REGIONAL CLIMATE MODEL
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作者 李维亮 龚威 +1 位作者 陈隆勋 宋玉宽 《Acta meteorologica Sinica》 SCIE 1997年第3期307-319,共13页
In this paper,we present the results simulated with the Chinese regional climate model nested in NCAR CCM1 GCM through one-way nesting approach.The model has been run for 14 months. The NCAR CCM1(1992)is at rhomboidal... In this paper,we present the results simulated with the Chinese regional climate model nested in NCAR CCM1 GCM through one-way nesting approach.The model has been run for 14 months. The NCAR CCM1(1992)is at rhomboidal truncation(R15),while the horizontal resolution of the Chinese regional climate model is 100 km.It is found that the Chinese regional climate model has some advantages in simulating the surface air temperature and precipitation over the general climate model,because of the improved land surface parameterization. 展开更多
关键词 regional climate one way nesting simulation seasonal change
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