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Parametric resonance of axially functionally graded pipes conveying pulsating fluid
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作者 Jie JING Xiaoye MAO +1 位作者 Hu DING Liqun CHEN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第2期239-260,共22页
Based on the generalized Hamilton's principle,the nonlinear governing equation of an axially functionally graded(AFG)pipe is established.The non-trivial equilibrium configuration is superposed by the modal functio... Based on the generalized Hamilton's principle,the nonlinear governing equation of an axially functionally graded(AFG)pipe is established.The non-trivial equilibrium configuration is superposed by the modal functions of a simply supported beam.Via the direct multi-scale method,the response and stability boundary to the pulsating fluid velocity are solved analytically and verified by the differential quadrature element method(DQEM).The influence of Young's modulus gradient on the parametric resonance is investigated in the subcritical and supercritical regions.In general,the pipe in the supercritical region is more sensitive to the pulsating excitation.The nonlinearity changes from hard to soft,and the non-trivial equilibrium configuration introduces more frequency components to the vibration.Besides,the increasing Young's modulus gradient improves the critical pulsating flow velocity of the parametric resonance,and further enhances the stability of the system.In addition,when the temperature increases along the axial direction,reducing the gradient parameter can enhance the response asymmetry.This work further complements the theoretical analysis of pipes conveying pulsating fluid. 展开更多
关键词 pipe conveying fluid axially functionally graded supercritical resonance multi-scale method parametric resonance
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Enhanced picosecond terahertz wave generation based on cascade effects in a terahertz parametric generator
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作者 张敬喜 王与烨 +5 位作者 徐炳烽 陈锴 刘紫鲲 马鸿儒 徐德刚 姚建铨 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第8期271-275,共5页
Enhanced terahertz wave generation via a Stokes cascade process has been demonstrated using picosecond pulse pumped terahertz parametric generation at 1 kHz repetition rate.Clear cascade saturation of terahertz output... Enhanced terahertz wave generation via a Stokes cascade process has been demonstrated using picosecond pulse pumped terahertz parametric generation at 1 kHz repetition rate.Clear cascade saturation of terahertz output was observed,and the corresponding cascade-Stokes spectra were analyzed.The maximum terahertz wave average power was 22μW under a pump power of 30 W,whereas the maximum power conversion efficiency was 8×10^(-7)under a pump power of 21 W.The THz power fluctuation was measured to be about 1%in 20 min.This THz parametric source with a relatively stable output is suitable for a variety of practical applications. 展开更多
关键词 terahertz parametric generation stimulated polariton cascade effect CLN crystal
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Parametric instability in the pure-quartic nonlinear Schrödinger equation
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作者 张云红 刘冲 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期316-321,共6页
We study the nonlinear stage of modulation instability(MI)in the non-intergrable pure-quartic nonlinear Schrödinger equation where the fourth-order dispersion is modulated periodically.Using the three-mode trunca... We study the nonlinear stage of modulation instability(MI)in the non-intergrable pure-quartic nonlinear Schrödinger equation where the fourth-order dispersion is modulated periodically.Using the three-mode truncation,we reveal the complex recurrence of parametric resonance(PR)breathers,where each recurrence is associated with two oscillation periods(PR period and internal oscillation period).The nonlinear stage of parametric instability admits the maximum energy exchange between the spectrum sidebands and central mode occurring outside the MI gain band. 展开更多
关键词 modulation instability parametric resonance breather three-mode truncation energy exchange
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Harmonic balance simulation of the influence of component uniformity and reliability on the performance of a Josephson traveling wave parametric amplifier
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作者 郑煜臻 熊康林 +1 位作者 冯加贵 杨辉 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期339-343,共5页
A Josephson traveling wave parametric amplifier(JTWPA),which is a quantum-limited amplifier with high gain and large bandwidth,is the core device of large-scale measurement and control systems for quantum computing.A ... A Josephson traveling wave parametric amplifier(JTWPA),which is a quantum-limited amplifier with high gain and large bandwidth,is the core device of large-scale measurement and control systems for quantum computing.A typical JTWPA consists of thousands of Josephson junctions connected in series to form a transmission line and hundreds of shunt LC resonators periodically loaded along the line for phase matching.Because the variation of these capacitors and inductors can be detrimental to their high-frequency characteristics,the fabrication of a JTWPA typically necessitates precise processing equipment.To guide the fabrication process and further improve the design for manufacturability,it is necessary to understand how each electronic component affects the amplifier.In this paper,we use the harmonic balance method to conduct a comprehensive study on the impact of nonuniformity and fabrication yield of the electronic components on the performance of a JTWPA.The results provide insightful and scientific guidance for device design and fabrication processes. 展开更多
关键词 Josephson traveling wave parametric amplifier(JTWPA) harmonic balance method YIELDS UNIFORMITY
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Modularized and Parametric Modeling Technology for Finite Element Simulations of Underground Engineering under Complicated Geological Conditions
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作者 Jiaqi Wu Li Zhuo +4 位作者 Jianliang Pei Yao Li Hongqiang Xie Jiaming Wu Huaizhong Liu 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第7期621-645,共25页
The surrounding geological conditions and supporting structures of underground engineering are often updated during construction,and these updates require repeated numerical modeling.To improve the numerical modeling ... The surrounding geological conditions and supporting structures of underground engineering are often updated during construction,and these updates require repeated numerical modeling.To improve the numerical modeling efficiency of underground engineering,a modularized and parametric modeling cloud server is developed by using Python codes.The basic framework of the cloud server is as follows:input the modeling parameters into the web platform,implement Rhino software and FLAC3D software to model and run simulations in the cloud server,and return the simulation results to the web platform.The modeling program can automatically generate instructions that can run the modeling process in Rhino based on the input modeling parameters.The main modules of the modeling program include modeling the 3D geological structures,the underground engineering structures,and the supporting structures as well as meshing the geometric models.In particular,various cross-sections of underground caverns are crafted as parametricmodules in themodeling program.Themodularized and parametric modeling program is used for a finite element simulation of the underground powerhouse of the Shuangjiangkou Hydropower Station.This complicatedmodel is rapidly generated for the simulation,and the simulation results are reasonable.Thus,this modularized and parametric modeling program is applicable for three-dimensional finite element simulations and analyses. 展开更多
关键词 Underground engineering modularized and parametric modeling finite element method complex geological structure cloud modeling
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Meta-Auto-Decoder:a Meta-Learning-Based Reduced Order Model for Solving Parametric Partial Differential Equations
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作者 Zhanhong Ye Xiang Huang +1 位作者 Hongsheng Liu Bin Dong 《Communications on Applied Mathematics and Computation》 EI 2024年第2期1096-1130,共35页
Many important problems in science and engineering require solving the so-called parametric partial differential equations(PDEs),i.e.,PDEs with different physical parameters,boundary conditions,shapes of computational... Many important problems in science and engineering require solving the so-called parametric partial differential equations(PDEs),i.e.,PDEs with different physical parameters,boundary conditions,shapes of computational domains,etc.Typical reduced order modeling techniques accelerate the solution of the parametric PDEs by projecting them onto a linear trial manifold constructed in the ofline stage.These methods often need a predefined mesh as well as a series of precomputed solution snapshots,and may struggle to balance between the efficiency and accuracy due to the limitation of the linear ansatz.Utilizing the nonlinear representation of neural networks(NNs),we propose the Meta-Auto-Decoder(MAD)to construct a nonlinear trial manifold,whose best possible performance is measured theoretically by the decoder width.Based on the meta-learning concept,the trial manifold can be learned in a mesh-free and unsupervised way during the pre-training stage.Fast adaptation to new(possibly heterogeneous)PDE parameters is enabled by searching on this trial manifold,and optionally fine-tuning the trial manifold at the same time.Extensive numerical experiments show that the MAD method exhibits a faster convergence speed without losing the accuracy than other deep learning-based methods. 展开更多
关键词 parametric partial differential equations(PDEs) META-LEARNING Reduced order modeling Neural networks(NNs) Auto-decoder
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Research on Urban Building Parametric Modelling Method Based on CityEngine
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作者 Xinyu Liu 《Journal of World Architecture》 2024年第1期7-11,共5页
With the advancement of technology and the development of cities,urban planning and management methods are also constantly improving.From paper-based assignments to modern digitization,new technologies have enabled mo... With the advancement of technology and the development of cities,urban planning and management methods are also constantly improving.From paper-based assignments to modern digitization,new technologies have enabled more efficient design and management for cities.3D modeling can used to simulate the urban environment,which can assist in urban planning and management.However,large-scale modeling cannot be achieved through existing modeling methods,and there are still some shortcomings in the maintenance of the model.Therefore,this article proposes a Computer Generated Architecture(CGA)parametric 3D modeling method based on CityEngine.Research on expanding and customizing modeling rules to create indoor and outdoor modeling rule templates for buildings and methods for generating urban 3D models have been carried out.The results have shown that the completed model can be displayed on different platforms thanks to parameterized modeling.The model can be modified easily and directly applied to the analysis and decision-making of urban planning schemes. 展开更多
关键词 CGA rules Urban planning Texture mapping parametric modeling
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A Comprehensive Guide for Selecting Appropriate Statistical Tests: Understanding When to Use Parametric and Nonparametric Tests
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作者 Saed Jama Abdi 《Open Journal of Endocrine and Metabolic Diseases》 2023年第4期464-474,共11页
Choosing appropriate statistical tests is crucial but deciding which tests to use can be challenging. Different tests suit different types of data and research questions, so it is important to choose the right one. Kn... Choosing appropriate statistical tests is crucial but deciding which tests to use can be challenging. Different tests suit different types of data and research questions, so it is important to choose the right one. Knowing how to select an appropriate test can lead to more accurate results. Invalid results and misleading conclusions may be drawn from a study if an incorrect statistical test is used. Therefore, to avoid these it is essential to understand the nature of the data, the research question, and the assumptions of the tests before selecting one. This is because there are a wide variety of tests available. This paper provides a step-by-step approach to selecting the right statistical test for any study, with an explanation of when it is appropriate to use it and relevant examples of each statistical test. Furthermore, this guide provides a comprehensive overview of the assumptions of each test and what to do if these assumptions are violated. 展开更多
关键词 Statistical Tests Levels of Measurement parametric NONparametric Normal Distribution
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A Comprehensive Guide for Selecting Appropriate Statistical Tests: Understanding When to Use Parametric and Nonparametric Tests
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作者 Saed Jama Abdi 《Open Journal of Statistics》 2023年第4期464-474,共11页
Choosing appropriate statistical tests is crucial but deciding which tests to use can be challenging. Different tests suit different types of data and research questions, so it is important to choose the right one. Kn... Choosing appropriate statistical tests is crucial but deciding which tests to use can be challenging. Different tests suit different types of data and research questions, so it is important to choose the right one. Knowing how to select an appropriate test can lead to more accurate results. Invalid results and misleading conclusions may be drawn from a study if an incorrect statistical test is used. Therefore, to avoid these it is essential to understand the nature of the data, the research question, and the assumptions of the tests before selecting one. This is because there are a wide variety of tests available. This paper provides a step-by-step approach to selecting the right statistical test for any study, with an explanation of when it is appropriate to use it and relevant examples of each statistical test. Furthermore, this guide provides a comprehensive overview of the assumptions of each test and what to do if these assumptions are violated. 展开更多
关键词 Statistical Tests Levels of Measurement parametric NONparametric Normal Distribution
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Table-top optical parametric chirped pulse amplifiers: past and present 被引量:1
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作者 Audrius Dubietis Aidas Matijošius 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第3期57-83,共27页
The generation of power-and wavelength-scalable few optical cycle pulses remains one of the major challenges in modern laser physics.Over the past decade,the development of table-top optical parametric chirped pulse a... The generation of power-and wavelength-scalable few optical cycle pulses remains one of the major challenges in modern laser physics.Over the past decade,the development of table-top optical parametric chirped pulse amplificationbased systems was progressing at amazing speed,demonstrating excellent performance characteristics in terms of pulse duration,energy,peak power and repetition rate,which place them at the front line of modern ultrafast laser technology.At present,table-top optical parametric chirped pulse amplifiers comprise a unique class of ultrafast light sources,which currently amplify octave-spanning spectra and produce carrier-envelope phase-stable,few optical cycle pulses with multi-gigawatt to multi-terawatt peak powers and multi-watt average powers,with carrier wavelengths spanning a considerable range of the optical spectrum.This article gives an overview on the state of the art of table-top optical parametric chirped pulse amplifiers,addressing their relevant scientific and technological aspects,and provides a short outlook of practical applications in the growing field of ultrafast science. 展开更多
关键词 optical parametric amplification post-compression ultrafast nonlinear optics high harmonic generation
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Multiple parametric Marcinkiewicz integrals with mixed homogeneity along surfaces
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作者 SHEN Jia-wei HE Shao-yong CHEN Jie-cheng 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2023年第3期413-428,共16页
In this paper, the multiple parametric Marcinkiewicz integral operators with mixed homogeneity along surfaces are studied. The Lp-mapping properties for such operators are obtained under the rather weakened size condi... In this paper, the multiple parametric Marcinkiewicz integral operators with mixed homogeneity along surfaces are studied. The Lp-mapping properties for such operators are obtained under the rather weakened size conditions on the integral kernels both on the unit sphere and in the radial direction. The main results essentially improve and extend certain previous results. 展开更多
关键词 parametric Marcinkiewicz integrals rough kernels mixed homogeneity product spaces
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High power,widely tunable femtosecond MgO:PPLN optical parametric oscillator
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作者 杨金芳 王翀 +9 位作者 令维军 薛婧雯 杜晓娟 王文婷 赵玉祥 路飞平 李向兵 宋贾俊 王兆华 魏志义 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第7期387-391,共5页
We demonstrate a high power,widely tunable femtosecond MgO-doped periodically poled lithium niobate(MgO:PPLN)optical parametric oscillator(OPO)at 151 MHz,pumped by a Kerr-lens mode-locked Yb:KGW laser.With a maximum p... We demonstrate a high power,widely tunable femtosecond MgO-doped periodically poled lithium niobate(MgO:PPLN)optical parametric oscillator(OPO)at 151 MHz,pumped by a Kerr-lens mode-locked Yb:KGW laser.With a maximum pump power of 7 W,the OPO is capable of delivering as high as 2.2 W of the signal centered around 1500 nm with tunable signal spectrum ranges of 1377 nm-1730 nm at an extraction efficiency of 31.4%,which exhibits a long-term passive power stability better than 0.71%rms over 4 h.The maximum idler bandwidths of 185 nm at 3613 nm are obtained across the idler tuning ranges of 2539 nm-4191 nm.By compensating intracavity dispersion,the signal has the shortest pulse duration of 170 fs at 1428 nm. 展开更多
关键词 femtosecond optical parametric oscillator synchronously pumping QUASI-PHASE-MATCHING MgO:PPLN crystal
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Flow-Induced Clogging in Microfiltration Membranes: Numerical Modeling and Parametric Study
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作者 Abdullah Rajah Al Qahtani 《Journal of Water Resource and Protection》 2023年第12期692-705,共14页
Microfiltration membrane technology has been widely used in various industries for solid-liquid separation. However, pore clogging remains a persistent challenge. This study employs (CFD) and discrete element method (... Microfiltration membrane technology has been widely used in various industries for solid-liquid separation. However, pore clogging remains a persistent challenge. This study employs (CFD) and discrete element method (DEM) models to enhance our understanding of microfiltration membrane clogging. The models were validated by comparing them to experimental data, demonstrating reasonable consistency. Subsequently, a parametric study was conducted on a cross-flow model, exploring the influence of key parameters on clogging. Findings show that clogging is a complex phenomenon affected by various factors. The mean inlet velocity and transmembrane flux were found to directly impact clogging, while the confinement ratio and cosine of the membrane pore entrance angle had an inverse relationship with it. Two clog types were identified: internal (inside the pore) and external (arching at the pore entrance), with the confinement ratio determining the type. This study introduced a dimensionless number as a quantitative clogging indicator based on transmembrane flux, Reynolds number, filtration time, entrance angle cosine, and confinement ratio. While this hypothesis held true in simulations, future studies should explore variations in clogging indicators, and improved modeling of clogging characteristics. Calibration between numerical and physical times and consideration of particle volume fraction will enhance understanding. 展开更多
关键词 Microfiltration Membrane parametric Study Computational Fluid Dynamic (CFD) Discrete Element Method (DEM) CFD-DEM Modeling Membrane Clogging Pore Geometry Numerical Modeling Cake Layer Clogging Indicator
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Mixed-Effects Parametric Proportional Hazard Model with Generalized Log-Logistic Baseline Distribution
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作者 Maryrose Wausi Peter Samuel Musili Mwalili +1 位作者 Anthony Kibira Wanjoya Abdsalam Hassan Muse 《Journal of Data Analysis and Information Processing》 2023年第2期81-102,共22页
Clustered survival data are widely observed in a variety of setting. Most survival models incorporate clustering and grouping of data accounting for between-cluster variability that creates correlation in order to pre... Clustered survival data are widely observed in a variety of setting. Most survival models incorporate clustering and grouping of data accounting for between-cluster variability that creates correlation in order to prevent underestimate of the standard errors of the parameter estimators but do not include random effects. In this study, we developed a mixed-effect parametric proportional hazard (MEPPH) model with a generalized log-logistic distribution baseline. The parameters of the model were estimated by the application of the maximum likelihood estimation technique with an iterative optimization procedure (quasi-Newton Raphson). The developed MEPPH model’s performance was evaluated using Monte Carlo simulation. The Leukemia dataset with right-censored data was used to demonstrate the model’s applicability. The results revealed that all covariates, except age in PH models, were significant in all considered distributions. Age and Townsend score were significant when the GLL distribution was used in MEPPH, while sex, age and Townsend score were significant in MEPPH model when other distributions were used. Based on information criteria values, the Generalized Log-Logistic Mixed-Effects Parametric Proportional Hazard model (GLL-MEPPH) outperformed other models. 展开更多
关键词 Survival Analysis Generalized Log-Logistic parametric Proportional Hazard Mixed-Effects Monte Carlo Maximum Likelihood Estimation
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Building Daylight Simulation Analysis Based on Ladybug+Honeybee Parametric Approach:A Case Study of Gando Primary School
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作者 Weizheng Tong 《Journal of Architectural Research and Development》 2023年第4期7-14,共8页
The Gando Primary School project faces several challenges like extreme environmental constraints,resource scarcity,and design requirements.These challenges include the hot climate of Burkina Faso,economic underdevelop... The Gando Primary School project faces several challenges like extreme environmental constraints,resource scarcity,and design requirements.These challenges include the hot climate of Burkina Faso,economic underdevelopment,building material scarcity,and lack of electrical resources.To implement an architectural design for the classrooms that accommodates these difficulties,especially in the absence of an electrical system,architect Francis Kéréemployed various passive design strategies that can provide shelter from the rain and heat while achieving essential lighting levels and ventilation.This paper used Gando Primary School as the research object and utilized the parametric tools of Ladybug+Honeybee(L+H)to conduct numerical simulations and evaluations of the building’s daylighting,glare analysis,and indoor thermal comfort.The aim of this study is to investigate the application of passive design strategies in energy conservation under extreme environmental conditions,propose a parametric energy-saving evaluation strategy with L+H,and explore energy-saving design ideas in economically underdeveloped Third World countries. 展开更多
关键词 Gando Primary School parametric Passive energy conservation Ladybug+Honeybee
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Coordinate-Parametric Matrix Model Inspired Square-Conjoint Pattern in Cross Woven for Conventional Bamboo Mat 被引量:1
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作者 Ye Fu Liwen Deng +2 位作者 Jinbo Hu Ti Li Shanshan Chang 《Journal of Renewable Materials》 EI 2023年第12期4025-4038,共14页
In the study,it is proposed that a coordinate-parametric matrix model is performed to a square-conjoint pattern of cross woven(SCPCW)in the bamboo mat.The patterns of SCPCW are firstly detected according to the perspe... In the study,it is proposed that a coordinate-parametric matrix model is performed to a square-conjoint pattern of cross woven(SCPCW)in the bamboo mat.The patterns of SCPCW are firstly detected according to the perspective of configuration,which is divided into the basic-monomer shape and the basic combination shape.Secondly,the compositions of design patterns in SCPCW are analyzed to attain the trend of curve shape.Based on the coordinate-parametric matrix model,the specimens of SCPCW are subsequently accomplished to elaborate the woven logic of bamboo mats.The digital innovation of SCPCW,defined by a mathematical resolution,is implemented by the software of Grasshopper(GH),which plays a crucial role in capturing image information by the Image Sampler component.Successively,the weaving logic of coordinated matrix is referred to apply in the computing component of Grasshopper software.Finally,the computer simulation could demonstrate that the coordinate-parametric matrix model of SCPCWwould be realized to analyze the micro-weaving structure and overall weaving effect in the bamboo mat. 展开更多
关键词 Cross woven configuration and composition coordinated parametrization weaving model
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基于Creo Parametric的新型防堵装置运动仿真 被引量:4
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作者 卢彩云 孟志军 +2 位作者 王秀 武广伟 李立伟 《农机化研究》 北大核心 2016年第8期60-63,共4页
结合被动式防堵装置和动力驱动式防堵装置的优缺点,开发了一种新型的滑板压秆旋切式防堵装置,并分析了该防堵装置的结构和工作原理。同时,采用Creo Parametric软件建立了三维几何模型,并通过Creo Parametric软件的机构模块对关键部件进... 结合被动式防堵装置和动力驱动式防堵装置的优缺点,开发了一种新型的滑板压秆旋切式防堵装置,并分析了该防堵装置的结构和工作原理。同时,采用Creo Parametric软件建立了三维几何模型,并通过Creo Parametric软件的机构模块对关键部件进行了干涉和运动仿真分析。通过分析确保该装置各部件之间不存在干涉,并得到其关键部件旋切平面刀端点的速度、速度X方向分量、速度Y方向分量及加速度、加速度X方向分量和加速度Y方向分量随时间的变化规律,旨在为滑板压秆旋切式防堵装置的结构优化提供科学依据。 展开更多
关键词 滑板压秆旋切式防堵装置 干涉分析 运动仿真 Creo parametric
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基于Creo Parametric的包装机曲柄滑块机构的优化设计 被引量:4
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作者 韩炬 冯华 黄家文 《包装工程》 CAS CSCD 北大核心 2013年第1期65-68,共4页
在Creo Parametric中,通过骨架模型,创建了偏置曲柄滑块机构模型,并对曲柄滑块机构进行了运动分析,应用Creo Parametric的行为建模功能,将滑块行程、最小压力角作为约束,对曲柄与连杆的长度进行了优化设计。该方法简单、实用性强,具有... 在Creo Parametric中,通过骨架模型,创建了偏置曲柄滑块机构模型,并对曲柄滑块机构进行了运动分析,应用Creo Parametric的行为建模功能,将滑块行程、最小压力角作为约束,对曲柄与连杆的长度进行了优化设计。该方法简单、实用性强,具有很大的推广价值,为曲柄滑块机构的设计提供了新的思路。 展开更多
关键词 Creo parametric 曲柄滑块机构 行为建模 优化设计
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基于Creo Parametric软件平台的混合式建模方法研究 被引量:11
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作者 吴江奎 史庆春 《机械设计》 CSCD 北大核心 2013年第2期105-107,共3页
计算机辅助工业设计在设计流程中的应用越来越广泛。通过对参数化建模和自由式建模的对比研究,指出了这两种方法各自的弊端,提出基于Creo Parametric软件平台的混合式建模办法。以电吹风产品模型构建的案例来说明混合式建模方法的工作流... 计算机辅助工业设计在设计流程中的应用越来越广泛。通过对参数化建模和自由式建模的对比研究,指出了这两种方法各自的弊端,提出基于Creo Parametric软件平台的混合式建模办法。以电吹风产品模型构建的案例来说明混合式建模方法的工作流程,并通过模型分析验证了这种方法的可行性。 展开更多
关键词 Creo parametric 计算机辅助工业设计 混合式建模
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