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四分格多角度摄影盒
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作者 陈凯 孙赣清 欧国成 《中国医疗器械杂志》 CAS 2000年第1期49-49,51,共2页
关键词 四分格 多角度摄影盒 X线机
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眼眶正侧位四分格双片法在鉴别眶内异物与伪影的应用价值的初步探讨
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作者 李庆丰 隋广平 +1 位作者 徐守阳 李航 《齐齐哈尔医学院学报》 2011年第12期1965-1965,共1页
目的探索改进的眼眶投照方法在鉴别诊断眶内异物与伪影的临床价值。方法怀疑眼眶内异物患者100例,用8×10英寸胶片一张,取四分格投照,按照眼眶正侧位投照方法摆位,摄片条件一般为50Kv,20MAS(条件根据不同患者适当加减);正位曝光后... 目的探索改进的眼眶投照方法在鉴别诊断眶内异物与伪影的临床价值。方法怀疑眼眶内异物患者100例,用8×10英寸胶片一张,取四分格投照,按照眼眶正侧位投照方法摆位,摄片条件一般为50Kv,20MAS(条件根据不同患者适当加减);正位曝光后患者保持体位不动,再以同样条件摄第二正位片;然后摆侧位同样操作摄取两个侧位两片。鉴别诊断方法:1)异物:呈点状或不规则致密影,在第一、第二正位片上位置、大小、形态、密度均相同;在第一、第二侧位片上位置、大小、形态、密度均相同。2)伪影:呈点状或不规则致密影。①正位片有,侧位片无;②侧位片有,正位片无;③正侧位片均有,但第一片和第二片比较位置、大小、形态、密度有一样不同或均不同。结果 100例患者400次曝光,出现在片中的致密影总数共216个,其中160个致密影为异物(40×4),56个致密影是伪影,伪影出现概率是14%(56/400×100%)。结论 "眼眶正侧位四分格双片法"可一次性准确鉴别眶内异物与伪影,是值得推广的新的投照方法。 展开更多
关键词 四分格双片法 眼眶 异物 伪影 鉴别
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眼眶正侧位四分格双片——鉴别眶内异物与伪影
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作者 肖兴丽 李庆丰 +1 位作者 党建波 隋广平 《齐齐哈尔医学院学报》 2001年第5期574-574,共1页
关键词 眼眶正侧位四分格双片 鉴别 眶内异物 伪影
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眼眶正侧位四分格双片鉴别眶内异物与伪影
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作者 肖兴丽 李庆丰 《中外医用放射技术》 2001年第8期31-31,共1页
关键词 眶内异物 眼0眶正侧位四分格双片 伪影
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Idiom Comprehension of Chinese Patients With Aphasia: A Case Study
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作者 Hongjun CHEN Xintong DOU +2 位作者 Yunan LIU Dawei HU Yan ZHAO 《Chinese Journal of Applied Linguistics》 2024年第4期569-590,687,共23页
Previous studies on idiom comprehension of patients with aphasia(PWAs)mainly focused on Indo-European speakers,examining whether PWAs could correctly extract the target meaning of idioms,while among Chinese PWAs,idiom... Previous studies on idiom comprehension of patients with aphasia(PWAs)mainly focused on Indo-European speakers,examining whether PWAs could correctly extract the target meaning of idioms,while among Chinese PWAs,idiom familiarity,context and other variables affecting idiom comprehension were rarely studied.Hence,this study aims to explore whether Chinese PWAs can correctly comprehend the target meaning of idioms,and further investigate the role of familiarity and context.For three Chinese PWAs,this study adopted the string-to-word matching task,taking Chinese four-character idioms as the experimental stimuli,and provided decoy words containing target meaning,literal meaning,unrelated abstract meaning and unrelated concrete meaning as the matching words of idiom items by manipulating the familiarity and contextual presence of idiom items.The results suggested that the PWAs could not correctly extract the target meaning of idioms and presented both the literal meaning tendency and the weak abstract meaning tendency,and the influence of familiarity on the comprehension of idioms was stronger than that of context.These results support the Graded Salience Hypothesis. 展开更多
关键词 APHASIA idiom comprehension Chinese four-character idioms graded salience hypothesis case study
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基于视频跟踪的前交叉韧带重建导航及仿真评估系统研究 被引量:1
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作者 胡岩 王田苗 +4 位作者 王君臣 孙磊 胡磊 许永刚 冯华 《中国生物医学工程学报》 CAS CSCD 北大核心 2009年第2期231-237,共7页
植入点位置的确定以及重建后是否满足等距性,对于前交叉韧带(ACL)的重建是至关重要的。针对ACL重建入点定位困难以及缺少术后评估等问题,借助于视频跟踪相机,实现了一种基于膝关节侧位X光片的股骨四分格和胫骨46%方法的ACL重建导航及仿... 植入点位置的确定以及重建后是否满足等距性,对于前交叉韧带(ACL)的重建是至关重要的。针对ACL重建入点定位困难以及缺少术后评估等问题,借助于视频跟踪相机,实现了一种基于膝关节侧位X光片的股骨四分格和胫骨46%方法的ACL重建导航及仿真评估系统,并分别介绍了视频跟踪、空间映射及C臂标定、图像融合、图像校正、曲面重建算法等关键技术的实现。利用该系统进行了8例模型骨的实验,并对采集到的特征点进行了精度验证,入点定位误差最大为2.59 mm,平均为1.59 mm。实验结果表明,该系统利用两幅X光图像可以完成ACL重建手术规划,入点定位误差可以基本满足临床应用要求,初步验证了该方法的可行性。 展开更多
关键词 计算机辅助导航 ACL重建 视频跟踪 四分格规划 仿真评估
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A Parallel Algorithm for Adaptive Local Refinement of Tetrahedral Meshes Using Bisection 被引量:31
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作者 Lin-Bo Zhang 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE 2009年第1期65-89,共25页
Local mesh refinement is one of the key steps in the implementations of adaptive finite element methods. This paper presents a parallel algorithm for distributed memory parallel computers for adaptive local refinement... Local mesh refinement is one of the key steps in the implementations of adaptive finite element methods. This paper presents a parallel algorithm for distributed memory parallel computers for adaptive local refinement of tetrahedral meshes using bisection. This algorithm is used in PHG, Parallel Hierarchical Grid Chttp://lsec. cc. ac. cn/phg/), a toolbox under active development for parallel adaptive finite element solutions of partial differential equations. The algorithm proposed is characterized by allowing simukaneous refinement of submeshes to arbitrary levels before synchronization between submeshes and without the need of a central coordinator process for managing new vertices. Using the concept of canonical refinement, a simple proof of the independence of the resulting mesh on the mesh partitioning is given, which is useful in better understanding the behaviour of the biseetioning refinement procedure. 展开更多
关键词 Adaptive refinement BISECTION tetrahedral mesh parallel algorithm MPI.
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New Normally Ordered Four-Mode Squeezing Operator for Standard Squeezing of Four-Mode Quadratures
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作者 FAN Hong-Yi CAO He-Lin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第1期135-138,共4页
By virtue of the technique of integration within an ordered product of operators a new four-mode squeezing operator that squeezes the four-mode quadrature operators of light field in the standard way is found. This op... By virtue of the technique of integration within an ordered product of operators a new four-mode squeezing operator that squeezes the four-mode quadrature operators of light field in the standard way is found. This operator differs from the direct product of two two-mode squeezing operators, It is the exponential operator V≡exp[ir (Q1P2+Q2P3+Q3P4+Q4P1)].The Wigner function of the new four-mode squeezed state is ealculated,which quite differs from that of the direct-product state of two usual two-mode squeezed states. 展开更多
关键词 four-mode quadrature operator squeezing operator the technique of IWOP Wigner function
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A study of nonlinear biochemical reaction model 被引量:1
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作者 Muhammad Asad Iqbal Syed Tauseef Mohyud-Din Bandar Bin-Mohsin 《International Journal of Biomathematics》 2016年第5期121-129,共9页
The present study deals with the introduction of an alteration in Legendre wavelets method by availing of the Picard iteration method for system of differential equations and named it Legendre wavelet-Picard method (... The present study deals with the introduction of an alteration in Legendre wavelets method by availing of the Picard iteration method for system of differential equations and named it Legendre wavelet-Picard method (LWPM). Convergence of the proposed method is also discussed. In order to check the competence of the proposed method, basic enzyme kinetics is considered. Systems of nonlinear ordinary differential equations are formed from the considered enzyme-substrate reaction. The results obtained by the proposed LWPM are compared with the numerical results obtained from Runge-Kutta method of order four (RK-4). Numerical results and those obtained by LWPM are in excellent conformance, which would be explained by the help of table and figures. The proposed method is easy and simple to implement as compared to the other existing analytical methods used for solving systems of differential equations arising in biology, physics and engineering. 展开更多
关键词 Legendre wavelets method Picard iteration method nonlinear biochemical reaction model Runge- Kutta method of order four.
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