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Novel high torque bearingless two-sided rotary ultrasonic motor 被引量:7
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作者 LI Xia CHEN Wei-shan XIE +1 位作者 Tao LIU Jun-kao 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第5期786-792,共7页
Applications are limited at present because the currently available ultrasonic motors (USMs) do not provide suffi-ciently high torque and power. The conventional travelling-wave USM needs the bearing to support, which... Applications are limited at present because the currently available ultrasonic motors (USMs) do not provide suffi-ciently high torque and power. The conventional travelling-wave USM needs the bearing to support, which required lubricant. To solve the above problem, a bearingless travelling-wave USM is designed. First, a novel structure of the two-sided USM consisting of a two-sided teeth stator and two disk-type rotors is designed. And the excitation principle of the two-sided travelling-wave USM is analyzed. Then, using ANSYS software, we set up the model of the stator to predict the excitation frequency and modal response of the stator. The shape of the vibration mode was obtained. Last, the load characteristics of the USM are measured using ex-perimental method. The maximum stall torque and the no-load speed were obtained. The results showed that the characteristics of the two-sided USM are better than those of the conventional one-sided USM. 展开更多
关键词 two-sided Ultrasonic motor (USM) Piezoelectric motor Travelling-wave BEARINGLESS
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Nonlinear vibration analysis of a circular micro-plate in two-sided NEMS/MEMS capacitive system by using harmonic balance method 被引量:4
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作者 Milad Saadatmand Alireza Shooshtari 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2019年第1期129-143,I0004,共16页
In this study, forced nonlinear vibration of a circular micro-plate under two-sided electrostatic, two-sided Casimir and external harmonic forces is investigated analytically. For this purpose, at first, von Karman pl... In this study, forced nonlinear vibration of a circular micro-plate under two-sided electrostatic, two-sided Casimir and external harmonic forces is investigated analytically. For this purpose, at first, von Karman plate theory including geometrical nonlinearity is used to obtain the deflection of the micro-plate. Galerkin decomposition method is then employed, and nonlinear ordinary differential equations (ODEs) of motion are determined. A harmonic balance method (HBM) is applied to equations and analytical relation for nonlineaT frequency response (F-R) curves are derived for two categories (including and neglecting Casimir force) separately. The analytical results for three cases:(1) semi-linear vibration;(2) weakly nonlinear vibration;(3) highly non linear vibration, are validated by comparing with the numerical solutio ns. After validation, the effects of the voltage and Casimir force on the natural frequency of two-sided capacitor system are investigated. It is shown that by assuming Casimir force in small gap distances, reduction of the natural frequency is considerable. The influences of the applied voltage, damping, micro-plate thickness and Casimir force on the frequency response curves have been presented too. The results of this study can be useful for modeling circular parallel-plates in nano /microelectromechanical transducers such as microphones and pressure sensors. 展开更多
关键词 NONLINEAR vibration two-sided MEMS CAPACITOR CIRCULAR PLATE Harmonic balance method
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Effective Hybrid Teaching-learning-based Optimization Algorithm for Balancing Two-sided Assembly Lines with Multiple Constraints 被引量:8
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作者 TANG Qiuhua LI Zixiang +2 位作者 ZHANG Liping FLOUDAS C A CAO Xiaojun 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第5期1067-1079,共13页
Due to the NP-hardness of the two-sided assembly line balancing (TALB) problem, multiple constraints existing in real applications are less studied, especially when one task is involved with several constraints. In ... Due to the NP-hardness of the two-sided assembly line balancing (TALB) problem, multiple constraints existing in real applications are less studied, especially when one task is involved with several constraints. In this paper, an effective hybrid algorithm is proposed to address the TALB problem with multiple constraints (TALB-MC). Considering the discrete attribute of TALB-MC and the continuous attribute of the standard teaching-learning-based optimization (TLBO) algorithm, the random-keys method is hired in task permutation representation, for the purpose of bridging the gap between them. Subsequently, a special mechanism for handling multiple constraints is developed. In the mechanism, the directions constraint of each task is ensured by the direction check and adjustment. The zoning constraints and the synchronism constraints are satisfied by teasing out the hidden correlations among constraints. The positional constraint is allowed to be violated to some extent in decoding and punished in cost fimction. Finally, with the TLBO seeking for the global optimum, the variable neighborhood search (VNS) is further hybridized to extend the local search space. The experimental results show that the proposed hybrid algorithm outperforms the late acceptance hill-climbing algorithm (LAHC) for TALB-MC in most cases, especially for large-size problems with multiple constraints, and demonstrates well balance between the exploration and the exploitation. This research proposes an effective and efficient algorithm for solving TALB-MC problem by hybridizing the TLBO and VNS. 展开更多
关键词 two-sided assembly line balancing teaching-learning-based optimization algorithm variable neighborhood search positional constraints zoning constraints synchronism constraints
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A Heuristic Method for Two-sided Assembly Line Balancing Problem 被引量:5
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作者 秦杏敏 金烨 《Journal of Shanghai Jiaotong university(Science)》 EI 2005年第1期61-65,共5页
A two-sided assembly line is typically found in plants producing large-sized products. Its advantages over a one-sided line and the difficulties faced in two-sided line balancing problems were discussed. A mathematica... A two-sided assembly line is typically found in plants producing large-sized products. Its advantages over a one-sided line and the difficulties faced in two-sided line balancing problems were discussed. A mathematical model for two-ALB problem was suggested. A modification of the “ranked positional weight” method, namely two-ALB RPW for two-ALB problems was developed. Experiments were carried out to verify the performance of the proposed method and the results show that it is effective in solving two-sided assembly line balancing problems. 展开更多
关键词 two-sided assembly lines assembly line balancing(ALB) task delay ranked positional weight(RPW)
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Laboratory Research on Effective Test Area of Short-Crested Waves Generated by Two-Sided Segmented Wavemakers 被引量:1
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作者 李俊 陈刚 +1 位作者 杨建民 彭涛 《China Ocean Engineering》 SCIE EI CSCD 2014年第2期181-192,共12页
The size and shape of the effective test area are crucial to consider when short-crested waves are created by segmented wavemakers. The range of the effective test area of short-crested waves simulated by two-sided se... The size and shape of the effective test area are crucial to consider when short-crested waves are created by segmented wavemakers. The range of the effective test area of short-crested waves simulated by two-sided segmented wavemakers is analyzed in this paper. The experimental investigation on the wave field distribution of short-crested waves generated by two-sided segmented wavemakers is conducted by using an array of wave gauges. Wave spectra and directional spreading function are analyzed and the results show that when the main direction is at a certain angle with the normal line of wave generators, the wave field of 3D short-crested waves generated by two-sided segmented wavemakers has good spatial uniformity within the model test area. The effective test area can provide good wave environments for seakeeping model tests of various ocean engineering structures in the deep ocean engineering basin. 展开更多
关键词 wave simulation 3D short-crested wave effective test area two-sided segmented wavemakers
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Two-Sided First Exit Problem for Jump Diffusion Distribution Processes Having Jumps with a Mixture of Erlang 被引量:1
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作者 Yuzhen Wen Chuancun Yin 《Applied Mathematics》 2013年第8期1142-1153,共12页
In this paper, we consider the two-sided first exit problem for jump diffusion processes having jumps with rational Laplace transforms. We investigate the probabilistic property of conditional memorylessness, and driv... In this paper, we consider the two-sided first exit problem for jump diffusion processes having jumps with rational Laplace transforms. We investigate the probabilistic property of conditional memorylessness, and drive the joint distribution of the first exit time from an interval and the overshoot over the boundary at the exit time. 展开更多
关键词 FIRST EXIT Time two-sided JUMPS Jump Diffusion Process OVERSHOOT
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Existence and Uniqueness of Solution to Two-Point Boundary Value for Two-Sided Fractional Differential Equations
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作者 Ailing Shi Yu Bai 《Applied Mathematics》 2013年第6期914-918,共5页
In this paper, existence and uniqueness of solution to two-point boundary value for two-sided fractional differential equations involving Caputo fractional derivative is discussed, by means of the Min-Max Theorem.
关键词 EXISTENCE UNIQUENESS two-sided FRACTIONAL Differential EQUATIONS
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Two-Sided Stable Matching Decision-Making Method Considering Matching Intention under a Hesitant Fuzzy Environment
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作者 Qi Yue Zhibin Deng 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第5期1603-1623,共21页
In this paper,a stable two-sided matching(TSM)method considering the matching intention of agents under a hesitant fuzzy environment is proposed.The method uses a hesitant fuzzy element(HFE)as its basis.First,the HFE ... In this paper,a stable two-sided matching(TSM)method considering the matching intention of agents under a hesitant fuzzy environment is proposed.The method uses a hesitant fuzzy element(HFE)as its basis.First,the HFE preference matrix is transformed into the normalized HFE preference matrix.On this basis,the distance and the projection of the normalized HFEs on positive and negative ideal solutions are calculated.Then,the normalized HFEs are transformed into agent satisfactions.Considering the stable matching constraints,a multiobjective programming model with the objective of maximizing the satisfactions of two-sided agents is constructed.Based on the agent satisfaction matrix,the matching intention matrix of two-sided agents is built.According to the agent satisfaction matrix and matching intention matrix,the comprehensive satisfaction matrix is set up.Furthermore,the multiobjective programming model based on satisfactions is transformed into a multiobjective programming model based on comprehensive satisfactions.Using the G-S algorithm,the multiobjective programming model based on comprehensive satisfactions is solved,and then the best TSM scheme is obtained.Finally,a terminal distribution example is used to verify the feasibility and effectiveness of the proposed method. 展开更多
关键词 two-sided matching stable matching hesitant fuzzy element matching intention programming model
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Logarithmic Sobolev Inequalities for Two-Sided Birth-Death Processes
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作者 YANG Qingshan LIU Hong GAO Fuqing 《Wuhan University Journal of Natural Sciences》 CAS 2008年第2期133-136,共4页
In this paper, we study the logarithmic Sobolev inequalities for two-sided birth-death processes. An estimate of the logarithmic Sobolev constant α for a two-sided birth-death process is obtained by the Hardy-type in... In this paper, we study the logarithmic Sobolev inequalities for two-sided birth-death processes. An estimate of the logarithmic Sobolev constant α for a two-sided birth-death process is obtained by the Hardy-type inequality and a criteria for a is also presented. 展开更多
关键词 logarithmic Sobolev inequality(LSI) two-sided birth-death process Hardy-type inequality Orlicz norm
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Microstructure and properties of Ti-bearing hot-rolled high-strength steel plates for two-sided enameling
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作者 WANG Shuangcheng SUN Quanshe XU Chun 《Baosteel Technical Research》 CAS 2018年第4期21-27,共7页
The composition and production technology of the type of hot-rolled steel plate used in two-sided enameling were briefly described. The microstructure and mechanical properties before and after enameling were contrast... The composition and production technology of the type of hot-rolled steel plate used in two-sided enameling were briefly described. The microstructure and mechanical properties before and after enameling were contrastively investigated,and the precipitates in the samples were analyzed using transmission electron microscope and energy dispersive spectrometer. The results show the ferrite grain size of the steel plate after high-temperature enamel firing to be fine,with a large number of TiC and Ti;C;S;precipitates dispersed throughout the ferrite matrix. After two rounds of enamel firing at a temperature range of 800-890 ℃,its yield strength can still reach342 MPa. The results of a hydrogen permeation test show that the hydrogen storage properties of the steel plate are much better than those of ordinary structural carbon steel. A better bubble structure in the enamel layer can be obtained by this steel plate,with no fish-scale defects on the enameled steel-plate surface. 展开更多
关键词 hot rolled two-sided enameling PRECIPITATES steel plates for enameling
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Some Mathematical Properties of the Dynamically Inconsistent Bellman Equation: A Note on the Two-Sided Altruism Dynamics
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作者 Aoki Takaaki 《Journal of Mathematics and System Science》 2015年第1期1-16,共16页
This article describes some dynamic aspects on dynastic utility incorporating two-sided altruism with an OLG setting. The special case is analyzed where the weights of two-sided altruism are dynamically inconsistent. ... This article describes some dynamic aspects on dynastic utility incorporating two-sided altruism with an OLG setting. The special case is analyzed where the weights of two-sided altruism are dynamically inconsistent. The Bellman equation for two-sided altruism proves to be reduced to one-sided dynamic problem, but the effective discount factor is different only in the current generation. It is shown that a contraction mapping result of value function cannot be achieved in general, and that there can locally exist an infinite number of self-consistent policy functions of the class C" with distinct steady states (indeterminacy of self-consistent, differentiable policy functions). 展开更多
关键词 Bellman equation two-sided altruism Dynamic inconsistency Self-consistent policy functions Indeterminacy Overlapping generations model.
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Two-Sided Matching Decision Making with Multi-Attribute Probabilistic Hesitant Fuzzy Sets
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作者 Peichen Zhao Qi Yue Zhibin Deng 《Intelligent Automation & Soft Computing》 SCIE 2023年第7期849-873,共25页
In previous research on two-sided matching(TSM)decision,agents’preferences were often given in the form of exact values of ordinal numbers and linguistic phrase term sets.Nowdays,the matching agent cannot perform the... In previous research on two-sided matching(TSM)decision,agents’preferences were often given in the form of exact values of ordinal numbers and linguistic phrase term sets.Nowdays,the matching agent cannot perform the exact evaluation in the TSM situations due to the great fuzziness of human thought and the complexity of reality.Probability hesitant fuzzy sets,however,have grown in popularity due to their advantages in communicating complex information.Therefore,this paper develops a TSM decision-making approach with multi-attribute probability hesitant fuzzy sets and unknown attribute weight information.The agent attribute weight vector should be obtained by using the maximum deviation method and Hamming distance.The probabilistic hesitancy fuzzy information matrix of each agent is then arranged to determine the comprehensive evaluation of two matching agent sets.The agent satisfaction degree is calculated using the technique for order preference by similarity to ideal solution(TOPSIS).Additionally,the multi-object programming technique is used to establish a TSM method with the objective of maximizing the agent satisfaction of two-sided agents,and the matching schemes are then established by solving the built model.The study concludes by providing a real-world supply-demand scenario to illustrate the effectiveness of the proposed method.The proposed method is more flexible than prior research since it expresses evaluation information using probability hesitating fuzzy sets and can be used in scenarios when attribute weight information is unclear. 展开更多
关键词 two-sided matching decision-making(TSMDM) probabilistic hesitant fuzzy set(PHFS) the technique for order preference by similarity to ideal solution(TOPSIS) MULTI-ATTRIBUTE
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对应分析和T-TEST在我国居民收入结构中的应用——基于2006年《中国统计年鉴》的实证研究 被引量:3
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作者 袁亮 唐红桃 陈恭军 《技术经济与管理研究》 2007年第5期51-54,共4页
从上世纪末至今,我国政府已经在全国范围内实施了包括"西部大开发"和"建设新农村"在内的多项重大的宏观经济政策。本文以"我国2005年城乡居民人均收入的统计数据"为基础,以"居民收入结构和水平"... 从上世纪末至今,我国政府已经在全国范围内实施了包括"西部大开发"和"建设新农村"在内的多项重大的宏观经济政策。本文以"我国2005年城乡居民人均收入的统计数据"为基础,以"居民收入结构和水平"为视角,以"对应分析和T-TEST"为方法,以"SAS8·2统计分析软件"为工具,对宏观经济政策的经济效果进行了检验。分析结果表明:1·城乡、东西部地区居民的收入结构较政策实施前发生了显著的积极变化;2·城乡间、东西部居民的人均收入水平的提高,但差距在扩大。 展开更多
关键词 对应分析 t-test SAS8.2 收入结构
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A New Maximum Test via the Dependent Samples t-Test and the Wilcoxon Signed-Ranks Test 被引量:3
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作者 Saverpierre Maggio Shlomo S. Sawilowsky 《Applied Mathematics》 2014年第1期110-114,共5页
A maximum test in lieu of forcing a choice between the two dependent samples t-test and Wilcoxon signed-ranks test is proposed. The maximum test, which requires a new table of critical values, maintains nominal α whi... A maximum test in lieu of forcing a choice between the two dependent samples t-test and Wilcoxon signed-ranks test is proposed. The maximum test, which requires a new table of critical values, maintains nominal α while guaranteeing the maximum power of the two constituent tests. Critical values, obtained via Monte Carlo methods, are uniformly smaller than the Bonferroni-Dunn adjustment, giving it power superiority when testing for treatment alternatives of shift in location parameter when data are sampled from non-normal distributions. 展开更多
关键词 MAXIMUM TEST DEPENDENT SAMPLES t-test Wilcoxon Signed-Ranks TEST Bonferroni-Dunn Adjustment Experiment-Wise Type I Error Inferential Statistics Monte Carlo Method
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A New Hybrid Feature Selection Method Using T-test and Fitness Function
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作者 Husam Ali Abdulmohsin Hala Bahjat Abdul Wahab Abdul Mohssen Jaber Abdul Hossen 《Computers, Materials & Continua》 SCIE EI 2021年第9期3997-4016,共20页
Feature selection(FS)(or feature dimensional reduction,or feature optimization)is an essential process in pattern recognition and machine learning because of its enhanced classification speed and accuracy and reduced ... Feature selection(FS)(or feature dimensional reduction,or feature optimization)is an essential process in pattern recognition and machine learning because of its enhanced classification speed and accuracy and reduced system complexity.FS reduces the number of features extracted in the feature extraction phase by reducing highly correlated features,retaining features with high information gain,and removing features with no weights in classification.In this work,an FS filter-type statistical method is designed and implemented,utilizing a t-test to decrease the convergence between feature subsets by calculating the quality of performance value(QoPV).The approach utilizes the well-designed fitness function to calculate the strength of recognition value(SoRV).The two values are used to rank all features according to the final weight(FW)calculated for each feature subset using a function that prioritizes feature subsets with high SoRV values.An FW is assigned to each feature subset,and those with FWs less than a predefined threshold are removed from the feature subset domain.Experiments are implemented on three datasets:Ryerson Audio-Visual Database of Emotional Speech and Song,Berlin,and Surrey Audio-Visual Expressed Emotion.The performance of the F-test and F-score FS methods are compared to those of the proposed method.Tests are also conducted on a system before and after deploying the FS methods.Results demonstrate the comparative efficiency of the proposed method.The complexity of the system is calculated based on the time overhead required before and after FS.Results show that the proposed method can reduce system complexity. 展开更多
关键词 Feature selection dimensional reduction feature optimization pattern recognition CLASSIFICATION t-test
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Comparison of the results of T-Test from different versions of Epi Info
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作者 Junke Tang Jinliang Zhu 《Journal of Nanjing Medical University》 2005年第4期210-213,共4页
Objective: To take advantage of Epi Info to manage and analyze disease data. Methods: After selecting the living examples for independent sample T-Test, Epi Info 5.00, 5.01a(Chinese), 6.00, 6.04 b, 6.04 d, 2000, 2... Objective: To take advantage of Epi Info to manage and analyze disease data. Methods: After selecting the living examples for independent sample T-Test, Epi Info 5.00, 5.01a(Chinese), 6.00, 6.04 b, 6.04 d, 2000, 2002(Chinese)were used to do the independent sample T-Test on the two living examples. Then, Intercooled StataT, Microsoft Excel(2002) and SPSS 10.0 for Windows were used to verify the results. Results: The statistical results from the Epi Info 5.00, 5.01a(Chinese) and 6.00 were the same while that from Epi Info 6.04 b, 6.04 d, 2000,2002 (Chinese), Intercooled StataT, Microsoft Excel(2002) and SPSS 10.0 for Windows were identical In independent sample T-Test,. But the former result is different with the latter. Conclusion: There was an error in the result of T-Test from Epi Info 6.00 and former versions. Thus, it's important to be alert to select the versions of Epi Info to manage and analyze disease data. On the other hand, it's also quite pivotal to distinguish the adopted Epi Info versions when referring to the articles ane use the statistical results. 展开更多
关键词 Epi Info t-test disease data management and analysis
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First Passage Density of Brownian Motion with Two-sided Piecewise Linear Boundaries
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作者 Zhen YU Mao Zai TIAN 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2024年第6期1505-1520,共16页
The first passage time has many applications in fields like finance,econometrics,statistics,and biology.However,explicit formulas for the first passage density have only been obtained for a few cases.This paper derive... The first passage time has many applications in fields like finance,econometrics,statistics,and biology.However,explicit formulas for the first passage density have only been obtained for a few cases.This paper derives an explicit formula for the first passage density of Brownian motion with twosided piecewise continuous boundaries which may have some points of discontinuity.Approximations are used to obtain a simplified formula for estimating the first passage density.Moreover,the results are also generalized to the case of two-sided general nonlinear boundaries.Simulations can be easily carried out with Monte Carlo method and it is demonstrated for several typical two-sided boundaries that the proposed approximation method offers a highly accurate approximation of first passage density. 展开更多
关键词 Boundary non-crossing probability first density passage density two-sided piecewise continuous boundaries Brownian motion
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Excel应用于显著性检验的实训过程探究 被引量:7
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作者 万海清 赵东海 《农业网络信息》 2011年第6期13-16,共4页
在Excel环境中采取编算式并调用粘贴函数,逐步实现了单个或两个样本的显著性检验过程。其中的数据分析软件运行T检验、F检验过程的结果进行比较,发现其中的不同之处有时会造成误判。明确这些差别有助于澄清显著性检验的每一个步骤和细节... 在Excel环境中采取编算式并调用粘贴函数,逐步实现了单个或两个样本的显著性检验过程。其中的数据分析软件运行T检验、F检验过程的结果进行比较,发现其中的不同之处有时会造成误判。明确这些差别有助于澄清显著性检验的每一个步骤和细节,正确运用Excel界面编程或通过运行数据分析软件提高效率。Excel界面用作生物统计课程实训操作平台,具有毋庸置疑的价值和优势,对于初学者,使用Excel电子表格逐步实现各种统计检验过程取得的教学效果,其他任何专业统计软件都无法替代。 展开更多
关键词 单元格块 观测值 变量 粘贴函数 t-test
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On a Two-sided Inequality Involving Stirling's Formula 被引量:6
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作者 徐利治 罗笑南 《Journal of Mathematical Research and Exposition》 CSCD 1999年第3期491-494,共4页
This note shows that the inequality rn holds for all n≥ 1.
关键词 two-sided inequality Stirling's formula
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Statistic Morphology Difference between Male and Female Individuals of Paramisgurnus dabryanus Sauvage
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作者 安丽 朱永安 +3 位作者 王玉新 郑玉珍 董学飒 刘羽清 《Agricultural Science & Technology》 CAS 2010年第8期114-116,124,共4页
[Objective] The aim was to compare the morphology difference between male and female individuals of Paramisgurnus dabryanus Sauvage. [Method] The comparison of 10 morphological characteristics between male and female ... [Objective] The aim was to compare the morphology difference between male and female individuals of Paramisgurnus dabryanus Sauvage. [Method] The comparison of 10 morphological characteristics between male and female individuals of P. dabryanus was conducted with principal component analysis and t-test methods. [Result] The results of t-test indicated that three of 10 morphological characteristics showed extremely significant difference(P0.01)and one of 10 morphological characteristics was significantly different(P0.05). Principal component analysis revealed four principal components,the contribution rate of which was 31.151%,18.844%,12.324% and 10.169%,respectively. The cumulative contribution rate had reached 72.487%. The morphological variations between male and female individuals were not significant,which was consistent with that of t-test. [Conclusion] The result in this study had provided theoretical basis for the breeding of P. dabryanus. 展开更多
关键词 Paramisgurnus dabryanus Sauvage Morphological trait Principal component analysis t-test
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