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运用清华山维EPS软件进行连幅批量入库的优势
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作者 董菲 《辽宁自然资源》 2021年第8期61-62,共2页
本文以某1:500比例尺航测数字化成图项目为例,探讨了利用清华山维EPS软件,连幅批量进行数据编辑及数据建库方法的几点优势。倡导作业过程打破常规,依据实际的灵活运用。
关键词 数据编辑 数据建库 连幅 批量 清华山维EPS
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Design of Bore Diameter Measuring System with Optical Fiber Link
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作者 SHANG Liping,ZHENG Dezhong,Li Zhanfeng,YANG Yutao (Yanshan University,Qinhuangdao 066004,CHN) 《Semiconductor Photonics and Technology》 CAS 1998年第1期50-55,共6页
The principle of amplitude modulation type bore diameter measuring system with optical fiber link is described and a realized method is given.
关键词 Amplitude Modulation Bore Diameter Optical Fiber Link
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AN IMPROVED AND EFFICIENT DETECTION SCHEME FOR V-BLAST SYSTEMS WITH QAM MODULATION 被引量:1
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作者 Lin Huajiong Tang Youxi Shao Shihai 《Journal of Electronics(China)》 2008年第5期588-594,共7页
The paper proposed an improved Ordered Successive Interference Cancellation(OSIC) detection scheme for V-BLAST systems with square/rectangular Quadrature Amplitude Modulation(QAM) modulation.It utilizes an equivalent ... The paper proposed an improved Ordered Successive Interference Cancellation(OSIC) detection scheme for V-BLAST systems with square/rectangular Quadrature Amplitude Modulation(QAM) modulation.It utilizes an equivalent real-valued vector expression of relationship between transmit signals and received signals,exploits the constellation's product-form structure and can eventually make the order,in which components of the transmit signals vector are extracted,more "optimal" in some sense.Thereby,it can offer an improved error probability as compared to the conventional OSIC detection scheme.In addition,the paper also proposes an efficient projection al-gorithm to calculate nulling vectors in a simple recursive fashion in order to avoid the vast increase of complexity,which is due to the fact that the original complex N -dimensional data vector and M×N channel matrix are transformed into a real 2N -dimensional data vector and a real 2M ×2N channel matrix respectively.A scrutinous complexity analysis shows that the complexity increases by only 33% as compared to the conventional scheme. 展开更多
关键词 Multiple-Input Multiple-Output (MIMO) Ordered Successive Interference Cancellation (OSIC) Quadrature Amplitude Modulation (QAM) Vertical Bell Labs Architecture of Layered Space-Time (V-BLAST)
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Dynamic analysis of elastic screen surface with multiple attached substructures and experimental validation 被引量:2
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作者 王宏 刘初升 +2 位作者 彭利平 蒋小伟 冀连权 《Journal of Central South University》 SCIE EI CAS 2012年第10期2910-2917,共8页
A feasible method to improve the reliability and processing efficiency of large vibrating screen via the application of an elastic screen surface with multiple attached substructures (ESSMAS) was proposed. In the ES... A feasible method to improve the reliability and processing efficiency of large vibrating screen via the application of an elastic screen surface with multiple attached substructures (ESSMAS) was proposed. In the ESSMAS, every screen rod, with ends embedded into elastomer, is coupled to the main screen structure in a relatively flexible manner. The theoretical analysis was conducted, which consists of establishing dynamic model promoted from the fuzzy structure theory as well as calculating for the equivalent stiffness of each attached structure. According to the numerical simulation using the NEWMARK-fl integration method, this assembling pattern significantly leads to the screen surface/rod having larger vibration intensity than that of the corresponding position on screen structure, which specifically, with an averaged acceleration amplitude increasing ratio of 11.37% in theoretical analysis and 20.27% in experimental test. The experimental results, within a tolerant error, also confirm the established model and demonstrate the feasibility of ESSMAS. 展开更多
关键词 mineral processing vibrating screen elastic screen surface attached substructures dynamic analysis reliability processing efficiency
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THE UPWIND FINITE DIFFERENCE FRACTIONAL STEPS METHOD FOR NONLINEAR COUPLED SYSTEM OF DYNAMICS OF FLUIDS IN POROUS MEDIA
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作者 Yirang YUAN 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2006年第4期498-516,共19页
For nonlinear coupled system of multilayer dynamics of fluids in porous media, the second order and first order upwind finite difference fractional steps schemes applicable to parallel arithmetic are put forward, trod... For nonlinear coupled system of multilayer dynamics of fluids in porous media, the second order and first order upwind finite difference fractional steps schemes applicable to parallel arithmetic are put forward, trod two-dimensional and three-dimensional schemes are used to form a complete set. Some techniques, such as calculus of variations, multiplicative commutation rule of difference operators, decomposition of high order difference operators and prior estimates, are adopted. Optimal order estimates in L2 norm are derived to determine the error in the second order approximate solution. This method has already been applied to the numerical simulation of migration-accumulation of oil resources. 展开更多
关键词 Convergence coupled system multilayer dynamics of fluids in porous media nonlinear equations upwind finite difference fractional steps method.
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