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糖尿病患者“寸、关、尺”脉搏压力波形的频谱分析 被引量:1
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作者 李本森 卢意成 +1 位作者 龚文波 缪馥星 《北京生物医学工程》 2023年第2期117-123,151,共8页
目的对糖尿病受试者的脉搏信号进行频域分析,研究糖尿病受试者脉搏波形在频域范围内的特性,探讨从频域特征判断糖尿病的可能性。方法应用三通道中医脉象仪,通过中医切脉定位寸、关、尺,采集糖尿病受试者和健康受试者的脉象信息,对采集... 目的对糖尿病受试者的脉搏信号进行频域分析,研究糖尿病受试者脉搏波形在频域范围内的特性,探讨从频域特征判断糖尿病的可能性。方法应用三通道中医脉象仪,通过中医切脉定位寸、关、尺,采集糖尿病受试者和健康受试者的脉象信息,对采集的脉象信息进行频域分析,并对功率谱密度的峰值进行指数拟合、统计糖尿病受试者与健康受试者的频域分布范围、峰值个数,以及低次谐波偏差、高次谐波偏差、总谐波偏差。结果通过对数据的统计分析、与健康受试者的数据对比发现:糖尿病受试者的脉搏波频率分布范围较大,谐波峰值的指数衰减特征与健康受试者具有很大不同,同一受试者寸、关、尺同样具有很大不同,且糖尿病受试者的第一主峰的分布频率要比健康受试者的高。结论糖尿病受试者与健康受试者频率分布范围不同,高次谐波偏差以及寸位置的第一主峰频率可以作为区分健康受试者以及糖尿病受试者的特征参数。临床测量验证了寸、关、尺脉搏波信号的不同,也恰佐证了中医脉诊过程中,区别寸、关、尺脉象,并综合诊断的实际应用。本文的初步研究结果将为进一步认识糖尿病及其中医临床脉诊的科学化奠定基础。 展开更多
关键词 脉搏压力信号 频谱分析 糖尿病 寸、三点脉搏压力信号
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肱尺关节后外侧滑膜嵌顿的手法治疗
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作者 陈茂义 《安徽中医临床杂志》 2001年第5期371-372,共2页
关键词 节后外侧滑膜嵌顿 推拿 手法
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三部脉象采集方法及关联性 被引量:2
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作者 王学民 王欣 +3 位作者 郭丹 宋鹏 张玉满 周鹏 《天津大学学报(自然科学与工程技术版)》 EI CSCD 北大核心 2016年第1期52-57,共6页
旨在研究一种新的三部脉象采集方法,同时利用统计学知识讨论寸、关、尺脉象的关联性.使用一种新的中医三部脉象仪,能够高采样率、高精度地采集寸、关、尺三部脉象数据,通过去噪和基线纠漂进行信号的预处理,在时域和频域上进行多个特征... 旨在研究一种新的三部脉象采集方法,同时利用统计学知识讨论寸、关、尺脉象的关联性.使用一种新的中医三部脉象仪,能够高采样率、高精度地采集寸、关、尺三部脉象数据,通过去噪和基线纠漂进行信号的预处理,在时域和频域上进行多个特征参数的提取,通过实验和对实验数据的分析探究三部脉象最佳取脉压力之间的相互关系以及单点压力变化时对于其他点脉象信息的影响,并将这一影响关系进行量化.对已知的'掌弓旁路效应'、'取脉压组效应'以及桡动脉血管模型进行了验证,并在此定性的基础上给出了量化的结论,也为脉象的成因进行了有益的探讨. 展开更多
关键词 中医脉象 寸、 联性
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按照新型货车制定钢轨装载标准
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作者 王林枝 《铁道运输与经济》 1981年第4期61-62,共2页
在1968年4月2日《公报分册》上制定了一般货物的装载标准项目。目前实行的有特大货物七件,圆滚货物二件,合计九件。在该年度由大阪铁路管理局使用チキ6000型及チキ7000型新型货车,对50公斤钢轨进行长期试验,根据试验结果提出50公斤... 在1968年4月2日《公报分册》上制定了一般货物的装载标准项目。目前实行的有特大货物七件,圆滚货物二件,合计九件。在该年度由大阪铁路管理局使用チキ6000型及チキ7000型新型货车,对50公斤钢轨进行长期试验,根据试验结果提出50公斤钢轨的标准化装载方法。其后日本国有铁路公司组织有关路局开会审查,并于1979年2月21日在公报上发表。 展开更多
关键词 装载标准 国有铁路 装载方法 货物转向架 试验结果 调车场 旋转台 车辆荷载 调车作业 关尺
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也谈切诊马牛下颌脉的价值——兼与张世奇先生商榷
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作者 杨卫国 朱天京 《中兽医医药杂志》 2003年第1期21-23,共3页
关键词 下颌脉 中兽医 脉学 分寸关尺 临床价值
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Stock discrimination of spottedtail goby (Synechogobius ommaturus) in the Yellow Sea by analysis of otolith shape 被引量:7
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作者 王英俊 叶振江 +1 位作者 刘群 曹亮 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2011年第1期192-198,共7页
Otolith shape is species specific and is an ideal marker of fish population affiliation. In this study, otolith shape of spottedtail goby Synechogobius ommaturus is used to identify stocks in different spawning locati... Otolith shape is species specific and is an ideal marker of fish population affiliation. In this study, otolith shape of spottedtail goby Synechogobius ommaturus is used to identify stocks in different spawning locations in the Yellow Sea. The main objectives of this study are to explore the potential existence of local stocks of spottedtail goby in the Yellow Sea by analysis of otolith shape, and to investigate ambient impacts on otolith shape. Spottedtail goby was sampled in five locations in the Yellow Sea in 2007 and 2008. Otoliths are described using variables correlated to size (otolith area, perimeter, length, width, and weight) and shape (rectangularity, circularity, and 20 Fourier harmonics). Only standardized otolith variables are used so that the effect of otolith size on the shape variables could be eliminated. There is no significant difference among variables of sex, year, and side (left and right). However, the otolith shapes of the spring stocks and the autumn stocks differ significantly. Otolith shape differences are greater among locations than between years. Correct classification rate of spottedtail goby with the otolith shape at different sampling locations range from 29.7%–77.4%. 展开更多
关键词 Synechogobius ommaturus the Yellow Sea otolith shape Fourier analysis
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Atomic Simulation of Structure and Deformation's Influence on the Mechanical Properties of Single-walled Carbon Nanotubes
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作者 Xiang-gui Ni Yu Wang +1 位作者 Zhong Zhang Xiu-xi Wang 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2006年第4期294-300,共7页
Tensile deformation behaviors and the Poisson's ratio of single-walled carbon nanotubes (SWCNTs) are numerically studied, using the molecular dynamics (MD) inethod. Effects of several structural features of cryst... Tensile deformation behaviors and the Poisson's ratio of single-walled carbon nanotubes (SWCNTs) are numerically studied, using the molecular dynamics (MD) inethod. Effects of several structural features of crystal cells of SWCNTs, i.e., the size, chirality and strain, on their mechanical properties are analyzed systematically. The simulations indicate that Armchair SWCNTs (8, 8)-(22, 22) and Zigzag SWCNTs (9,0)- (29,0) can be stretched by 35%-38% and 20%-27% without sign of plasticity, respectively. The Young's modulus of SWCNTs under tension ranges from 960 GPa to 750 GPa as their radii increase. The Young's modulus of zigzag SWCNTs is higher than that of armchair SWCNTs. Additionally, three SWCNTs (9,9), (12,6) and (16,0) are investigated to obtain their Poisson's ratio under tensile and compressive loading. The results show that the Poisson's ratio of nanotubes decreases generally as the strain increases. Under the same tensile strain, the Poisson's ratio decreases as the chiral angles of SWCNTs decrease, while their Polsson's ratios increase under the same compressive strain. 展开更多
关键词 Single-walled carbon nanotube Chiral dependence Size dependence Strain dependence Poisson's ratio
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Bending behaviour of lightweight aggregate concrete-filled steel tube spatial truss beam 被引量:3
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作者 傅中秋 吉伯海 +1 位作者 朱伟 葛汉彬 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期2110-2117,共8页
A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. Accor... A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. According to the test results, several assumptions were made to deduce the bearing capacity calculation method based on the force balance of the whole section. An optimal dimension relationship for the truss beam chords was proposed and verified by finite element analysis. Results show that the LACFST spatial truss beam failed after excessive deflection. The strain distribution agreed with Bernoulli-Euler theoretical prediction. The truss beam flexural bearing capacity calculation results matched test evidence with only a 3% difference between the two. Finite element analyses with different chord dimensions show that the ultimate bearing capacity increases as the chord dimensions increase when the chords have a diameter smaller than optimal one; otherwise, it remains almost unchanged as the chord dimensions increase. 展开更多
关键词 lightweight aggregate concrete-filled steel tube spatial truss beam bending behaviour bearing capacity
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Testing for Nonlinearity in Five Emerging Markets' Exchange Rates
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作者 吉余峰 雷强 《Journal of Donghua University(English Edition)》 EI CAS 2010年第4期551-558,共8页
Unlike the Brock,Dechert,and Scheinkman(BDS)test,the Surrogate Data method is not only able to provide a nonlinearity test for exchange rates,but also distinguish whether the nonlinear features come from the economic ... Unlike the Brock,Dechert,and Scheinkman(BDS)test,the Surrogate Data method is not only able to provide a nonlinearity test for exchange rates,but also distinguish whether the nonlinear features come from the economic system itself.Our analysis gives some evidence on the presence of nonlinear dependency of five emerging markets' exchange rates by using BDS test.Furthermore,we present evidence in existence of intrinsic and deterministic nonlinearity in the five exchange rates using the Surrogate Data method,comparing the original data and surrogate data and rejecting the null hypothesis in confidence coefficient 95%.The results provide the basis for the analyses of the chaotic properties of exchange rate time series and their future nonlinear forecasting. 展开更多
关键词 Brock Dechert and Scheinkman(BDS)test surrogate data correlation dimension exchange rate NONLINEARITY
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Modeling and Evaluating Telecommunication Industry's “Internet-and-Digitized” Development
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作者 xuenan ju xiaowen li +1 位作者 wenjun jing baowen sun 《China Communications》 SCIE CSCD 2018年第4期210-220,共11页
This paper systematically investigates telecommunication industry's "internet-and-digitization" development situation. Based on existing literature and the unique characteristics of telecommunication ind... This paper systematically investigates telecommunication industry's "internet-and-digitization" development situation. Based on existing literature and the unique characteristics of telecommunication industry, we build a comprehensive model to depict the level of "internet-and-digitization" development by five key dimensions: market size, informational investment, technological innovation, internet application, and internet penetration. We propose that this five-dimensional model can capture the key components of "internet-and-digitization" development in this digital era. By using Beijing's telecommunication data, we empirically test our conceptual model and explore the current development level of telecommunication industry's "internet-and-digitization" progress. Results show that Beijing's telecommunication industry has great potential in expanding online market size as well as activating technological innovation. We also suggest that bigger telecommunication firms should pay more attention to "internet-and-digitization" development, especially on internet application and penetration dimensions. Finally, theoretical contributions, managerial implications and future research directions are also discussed. 展开更多
关键词 telecommunication industry in-ternet-and-digitization information technolo-gy (IT) Beijing telecommunication internetapplication internet penetration
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Critical Dimension for Stable Self-Gravitating Stars in AdS
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作者 LI Zhong-Hua CAI Rong-Gen 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第8期255-260,共6页
We study the self-gravitating stars with a linear equation of state, P = aρ, in AdS space, where a is a constant parameter. There exists a critical dimension, beyond which the stars are always stable with any central... We study the self-gravitating stars with a linear equation of state, P = aρ, in AdS space, where a is a constant parameter. There exists a critical dimension, beyond which the stars are always stable with any central energy density; below which there exists a maximal mass configuration for a certain central energy density and when the central energy density continues to increase, the configuration becomes unstable. We find that the critical dimension depends on the parameter a, it runs from d = 11.1429 to 10.1291 as a varies from a = 0 to 1. The lowest integer dimension for a dynamically stable self-gravitating configuration should be d = 12 for any a E [0, 1] rather than d = 11, the latter is the case of self-gravitating radiation configurations in AdS space. 展开更多
关键词 critical dimension self-gravitating star AdS space
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Oscillation in frequency of tropical cyclones passing Taiwan and Hainan Islands and the relationship with summer monsoon 被引量:2
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作者 王闪闪 管玉平 +1 位作者 管廷昭 黄建平 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2012年第6期966-973,共8页
The temporal variations in the frequency of tropical cyclones (TCs) traversing the Taiwan and Hainan Islands (TH islands), were analyzed using a best-track TC dataset from the Joint Typhoon Warning Center for the peri... The temporal variations in the frequency of tropical cyclones (TCs) traversing the Taiwan and Hainan Islands (TH islands), were analyzed using a best-track TC dataset from the Joint Typhoon Warning Center for the period 1945-2007. Results show that the oscillations were interannual and interdecadal on the timescales of 2-8 and 8-12 years, respectively. It is also shown that the number of TCs formed in the western North Pacific basin (WNP) and of those traversing the TH islands varied intraseasonally. These results also held for typhoons traversing the TH islands, although the oscillations were less apparent. This study identified interrelationships between the frequency of TCs making landfall on the TH islands and the East Asia summer monsoon (EASM), the South Asia summer monsoon (SASM), and the South China Sea summer monsoon (SCSSM). The SCSSM significantly influenced the number of TCs traversing Hainan Island, but had little influence on the number of TCs traversing Taiwan Island. By contrast, the SASM influenced the numbers of TCs traversing both of the TH islands, shown by correlation coefficients of 0.41 for Taiwan Island and -0.25 for Hainan Island. In addition, the frequency of TC landfall on Taiwan Island increased during years of enhanced EASM, as indicated by a correlation coefficient of 0.4. 展开更多
关键词 tropical cyclone OSCILLATION MONSOON
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Effects of Different Connectivity Topologies in Small World Networks on EEG-Like Activities
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作者 LIN Min ZHANG Gui-Qing CHEN Tian-Lun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第2期373-378,共6页
Based on our previously pulse-coupled integrate-and-fire neuron model in small world networks, we investigate the effects of different connectivity topologies on complex behavior of electroencephalographic-like signal... Based on our previously pulse-coupled integrate-and-fire neuron model in small world networks, we investigate the effects of different connectivity topologies on complex behavior of electroencephalographic-like signals produced by this model. We show that several times series analysis methods that are often used for analyzing complex behavior of electroencephalographic-like signals, such as reconstruction of the phase space, correlation dimension, fractal dimension, and the Hurst exponent within the rescaled range analysis (R/S). We lind that the different connectivity topologies lead to different dynamical behaviors in models of integrate-and-fire neurons. 展开更多
关键词 correlation dimension Hurst exponent small world networks
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Analysis of Test Methods for Parts to Follow Relative Requirements 被引量:2
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作者 潘淑清 《Journal of Beijing Institute of Technology》 EI CAS 2002年第1期71-74,共4页
Testing the parts of mechanical products and ensuring their accuracy to the design requirements are essential to products’ quality, market competitiveness and manufacturers’ maximum economical benefits from these pr... Testing the parts of mechanical products and ensuring their accuracy to the design requirements are essential to products’ quality, market competitiveness and manufacturers’ maximum economical benefits from these products. One of the latest subjects of study in the area of precision measurement is the testing of parts to follow the relative requirements, viz. design requirements for the size tolerance of size features and related geometrical tolerances of the central feature, including the envelope requirement, maximum material requirement and least material requirement. The article analyzes test methods for parts to follow the envelope requirement or maximum material requirement, as well as further requirements of geometrical tolerances for its central feature. The method is effective in improving product quality and rejecting unqualified parts. 展开更多
关键词 tolerancing principle envelope requirement maximum material requirement
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Black Hole Entropy with Modified Dispersion Relations
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作者 WANG Fu-Jun GUI Yuan-Xing ZHANG Yu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第8期261-263,共3页
There is much interest in resolving the quantum corrections to Bekenstein-Hawking entropy with a large length scale limit. The leading correction term & given by the logarithm of black hole area with a model-dependen... There is much interest in resolving the quantum corrections to Bekenstein-Hawking entropy with a large length scale limit. The leading correction term & given by the logarithm of black hole area with a model-dependent coefficient. Recently the research for quantum gravity implies the emergence of a modification of the energy-momentum dispersion relation (MDR), which plays an important role in the modified black hole thermodynamics. In this paper, we investigate the quantum corrections to Bekenstein-Hawking entropy in four-dimensional Sehwarzschild black hole and Reissner-Nordstrom black hole respectively based on MDR. 展开更多
关键词 black hole ENTROPY dispersion relation
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Using density functional calculations to elucidate atomic ordering of Pd-Rh nanoparticles at sizes relevant for catalytic applications
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作者 Lorena Vega Hristiyan A.Aleksandrov Konstantin M.Neyman 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1749-1757,共9页
Pd-Rh nanoparticles are known to easily undergo surface restructuring in reactive environment. This study quantifies, with the help of density functional(DFT) calculations and a novel topological approach, atomic orde... Pd-Rh nanoparticles are known to easily undergo surface restructuring in reactive environment. This study quantifies, with the help of density functional(DFT) calculations and a novel topological approach, atomic ordering and surface segregation effects in Pd-Rh particles with compositions 1:3, 1:1 and 3:1 containing up to 201 atoms(ca. 1.7 nm). The obtained data are used to reliably optimise energetically preferred atomic orderings in inaccessible by DFT Pd-Rh particles containing thousands of atoms and exhibiting sizes exceeding 5 nm, which are typical for catalytic metal particles. It is outlined, how segregation effects on the surface arrangement of Pd-Rh nanoalloy catalysts induced by adsorbates can be evaluated in a simple way within the present modelling setup. 展开更多
关键词 Density functional calculations Atomic ordering Pd Rh nanoparticles Size relevant
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Self-organized Criticality in an Earthquake Model on Random Network
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作者 ZHANG Duan-Ming SUN Fan YU Bo-Ming PAN Gui-Jun SUN Hong-Zhang YIN Yah-Ping LI Rui SU Xiang-Ying 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第2期293-296,共4页
A simplified Olami-Feder-Christensen model on a random network has been studied. We propose a new toppling rule -- when there is an unstable site toppling, the energy of the site is redistributed to its nearest neighb... A simplified Olami-Feder-Christensen model on a random network has been studied. We propose a new toppling rule -- when there is an unstable site toppling, the energy of the site is redistributed to its nearest neighbors randomly not averagely. The simulation results indicate that the model displays self-organized criticality when the system is conservative, and the avalanche size probability distribution of the system obeys finite size scaling. When the system is nonconservative, the model does not display scaling behavior. Simulation results of our model with different nearest neighbors q is also compared, which indicates that the spatial topology does not alter the critical behavior of the system. 展开更多
关键词 self-organized criticality earthquake model finite size scaling random network
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Fundamental Theories of Spatial Similarity Relations in Multi-scale Map Spaces 被引量:18
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作者 YAN Haowen 《Chinese Geographical Science》 SCIE CSCD 2010年第1期18-22,共5页
Similarity relation is one of the spatial relations in the community of geographic information science and cartography.It is widely used in the retrieval of spatial databases, the recognition of spatial objects from i... Similarity relation is one of the spatial relations in the community of geographic information science and cartography.It is widely used in the retrieval of spatial databases, the recognition of spatial objects from images, and the description of spatial features on maps.However, little achievements have been made for it by far.In this paper, spatial similarity relation was put forward with the introduction of automated map generalization in the construction of multi-scale map databases;then the definition of spatial similarity relations was presented based on set theory, the concept of spatial similarity degree was given, and the characteristics of spatial similarity were discussed in detail, in-cluding reflexivity, symmetry, non-transitivity, self-similarity in multi-scale spaces, and scale-dependence.Finally a classification system for spatial similarity relations in multi-scale map spaces was addressed.This research may be useful to automated map generalization, spatial similarity retrieval and spatial reasoning. 展开更多
关键词 similarity relation spatial relation multi-scale map spaces
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Stress Analysis and Shape Design of a Femoral Hip Prosthesis
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作者 YANG Zheng-ming YU Xue-zhong +1 位作者 GUO Yi-mu YAN Shi-gui 《Chinese Journal of Biomedical Engineering(English Edition)》 2011年第2期67-74,共8页
Objective: To study the stress distribution of the femoral hip prosthesis after the hip joint replacement. Methods: After the hip joint replacement, when the fenmr and prosthesis are considered as concentric cylinde... Objective: To study the stress distribution of the femoral hip prosthesis after the hip joint replacement. Methods: After the hip joint replacement, when the fenmr and prosthesis are considered as concentric cylinders with perfectly banded interface, a relatively perfect theoretical model of simulating the interracial stress transfer is established. Results: The maximum interfaeial shear stress oeeured at Z=O. At the cross-section of the femoral neck, interfacial shear stress decreased exponentially with the increases of the Z. Shear stress became very small at Z〉0. 1 m, which meant that the shear stress at the far end of the femoral hip prosthesis was very small. In order to avoid the stress concentration and femoral hip prosthesis sinking, interracial stress must remain constant and balanced with the pressure load at Z=O. The radius of the femoral hip prosthesis changed with interfacial shear stress. The maximum value of the radius occured at Z=O, then it decreased at m. Specially, a=18.2 mm at Z=10 ram, a=5.36 mm at Z=98 ram, these are ideal radius. Conclusion: A theoretical model of simulating the interfacial stress is established when the femur and prosthesis are considered as concentric cylinders. The distributions of the interfacial shear and radial stresses with the axial positions are obtained. A theoretical reference for the design of the prosthesis is provided. 展开更多
关键词 femoral hip joint stress analysis PROSTHESIS size design
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LC-MS/MS Method Applied to the Detection and Quantification of Ursodeoxycholic Acid Related Substances in Raw Material and Pharmaceutical Formulation
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作者 Boscolo Oriana Flor Sabrina +4 位作者 Dobrecky Cecilia Martinefski Manuela Tripodi Valeria Lucangioli Silvia Silvia Lucangioli 《Journal of Pharmacy and Pharmacology》 2018年第5期448-455,共8页
Objective: To develop a highly sensitive LC-MS/MS (liquid chromatography-mass spectxometry/mass spectrometry) method applied to the detection and quantitation of UDCA (ursodeoxycholic acid) related substances suc... Objective: To develop a highly sensitive LC-MS/MS (liquid chromatography-mass spectxometry/mass spectrometry) method applied to the detection and quantitation of UDCA (ursodeoxycholic acid) related substances such as CA (cholic acid), DCA (deoxycholic acid), CDCA (chenodeoxycholic acid) and LCA (lithocholic acid) in raw material and pharmaceutical formulation. Methods: The method was validated for specificity, linearity, accuracy, precision, robustness. A triple quadrupole mass detector was employed, equipped with an ESI (electrospray ionization) source operated in the negative ion mode. The chromatographic system consisted of a Symmetry C 18 column (150 mm × 4.6 mm, id; particle size 5 μm) and methanol-acetonitrile-ammonium acetate (pH 7.6; 10 mM) (40:40:20, v/v/v) as the mobile phase. The chromatographic conditions were 25 uL injection volume, flow rate of 0.4 mL/min and column temperature set at 35℃. Key tindings: The method requires a minimum sample amount and presents very low LOD (limits of detection) for CA (0.29 ng/mL), DCA (0.59 ng/mL), CDCA (0.13 ng/mL) and LCA (0.44 ng/mL) in comparison to LC methods coupled to different detectors like UV (ultraviolet), fluorescence and refractive index. Conclusions: The developed and validated LC-MS/MS method for the determination of UDCA and related substances in raw material and in a suspension was advantageous since it required a minimum sample amount. In turn, it could be used as a stability indicating method. 展开更多
关键词 UDCA related substances LC mass detector pharmaceutical formulation.
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