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Theoretical study on setup of expanded-base pile considering cavity contraction

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Journal of Central South University 2015年第11期22卷 4355-4365页

作者：齐昌广刘干斌王艳邓岳保 Faculty of Architectural Civil Engineering and Environment Ningbo University

When an expanded-base pile is installed into ground, the cavity expansion associated with penetration of the enlarged pile base is followed by cavity contraction along the smaller-diameter pile shaft. In order to account for the influence of cavity contraction on the change of bearing capacity of expanded-base pile, a theoretical calculation methodology, predicting the setup of expanded-base pile, was established by employing the cavity contraction theory to estimate the shaft resistance of expanded-base pile, and horizontal consolidation theory to predict the dissipation of excess pore pressure. Finally, the numerical solutions for the setup of expanded-base pile were obtained. The parametric study about the influence of cavity contraction on setup of expanded-base pile was carried out, while a field test was introduced. The parametric study shows that the decrements in radial pressure and the maximum pore water pressure after considering cavity contraction are increased as the expanded ratio(base diameter/shaft diameter) and rigidity index of soil are raised. The comparison between calculated and measured values shows that the calculated results of ultimate bearing capacity for expanded-base pile considering cavity contraction agree well with the measured values; however, the computations ignoring cavity contraction are 2.5-3.0 times the measured values.

关键词： expanded-base pile setup cavity contraction numeri

A Comparative Study of Numerical Models for Wave Propagation and setup on Steep Coral Reefs

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China Ocean Engineering 2019年第4期33卷 424-435页

作者： ZHANG Shan-ju ZHU Liang-sheng ZOU Kai South China University of Technology School of Civil Engineering and Transportation

Complex factors including steep slopes, intense wave breaking, large bottom friction and remarkable wave setup should be considered while studying wave propagation over coral reefs, and how to simulate wave propagation and setup on coral reefs efficiently has become a primary focus. Several wave models can be used on coral reefs as have been published, but further testing and comparison of the reliability and applicability of these models are needed. A comparative study of four numerical wave models (i.e., FUNWAVE-TVD, Coulwave, NHWAVE and ZZL18) is carried out in this paper. These models’ governing equations and numerical methods are compared and analyzed firstly to obtain their differences and connections;then the simulation effects of the four wave models are tested in four representative laboratory experiments. The results show that all four models can reasonably predict the spectrum transformation. Coulwave, NHWAVE and ZZL18 can predict the wave height variation more accurately;Coulwave and FUNWAVE-TVD tend to underestimate wave setup on the reef top induced by spilling breaker, while NHWAVE and ZZL18 can predict wave setup relatively accurately for all types of breakers;NHWAVE and ZZL18 can predict wave reflection by steep reef slope more accurately. This study can provide evidence for choosing suitable models for practical engineering or establishing new models.

关键词： coral reefs steep slope Boussinesq equations wave propagation and setup wave breaking numerical simulation comparative study

A Compact setup of Saturated Absorption Spectroscopy for Diode Laser Frequency Stabilization

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Chinese Physics Letters 2012年第7期29卷 114-117页

作者： ZHANG Xian HUANG Kai-Kai XU Hao XU Zhou-Xiang LI Nan LU Xuan-Hui Institute of Optics Department of PhysicsZhejiang UniversityHangzhou 310027

A novel setup of saturated absorption spectroscopy (SAS) is *** is based on laser reflections at surfaces of a sample vapor *** only needs one cell and one photodiode and is more compact than conventional setups of *** spectrum is similar to a conventional *** frequency stabilization performance of an external-cavity diode laser with this setup is investigated.A frequency stability of 1.1 × 10^(-11) is achieved at an averaging time of 60s in the Allen variance measurements.

关键词： setup Compact stabilization

NARRATING CHECKS AND BALANCES?THE setup OF FINANCERELATED ADMINISTRATIVE DOCUMENTS AND INSTITUTIONS IN 5TH AND 4TH CENTURY BC ATHENS

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Journal of Ancient Civilizations 2019年第2期34卷 211-227,328页

作者： Sven Günther IHAC NENUChangchun

The setup and narratives of finance-related administrative documents and powers tell the story and fate of the Athenian *** the one hand,one can see the permanently repeated and impressive statement of stability that did not only astonish contemporaries,especially critics of the democratic *** was mirrored in the frequent publication of financial *** were more representative in various aspects than informative in the sense of a real transparent ***,the many offices mentioned both in the literary and epigraphic documents reflect the constant mistrust in,and restriction of,the accumulation of power in the democratic *** the other hand,these formalities and standardized formulas do clearly not carry the whole story,and are superseded in the course of the 4th century by informal powerconglomerations.

关键词： setup finance statement

An Improved Ant Colony Algorithm for a Single-machine Scheduling Problem with setup Times

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武汉理工大学学报 2006年第S3期28卷 956-961页

作者： YE Qiang LIU Xinbao LIU Lin YANG Shanglin School of Management,Hefei University of Technology,Hefei 230009,China, School of Management Hefei University of TechnologyHefei 230009China

Motivated by industrial applications we study a single-machine scheduling problem in which all the jobs are mutu- ally independent and available at time *** machine processes the jobs sequentially and it is not idle if there is any job to be pro- *** operation of each job cannot be *** machine cannot process more than one job at a time.A setup time is needed if the machine switches from one type of job to *** objective is to find an optimal schedule with the minimal total jobs’completion *** the sum of jobs’processing time is always a constant,the objective is to minimize the sum of setup *** colony optimization(ACO)is a meta-heuristic that has recently been applied to scheduling *** this paper we propose an improved ACO-Branching Ant Colony with Dynamic Perturbation(DPBAC)algorithm for the single-machine schedul- ing *** improves traditional ACO in following aspects:introducing Branching Method to choose starting points;im- proving state transition rules;introducing Mutation Method to shorten tours;improving pheromone updating rules and introduc- ing Conditional Dynamic Perturbation *** results show that DPBAC algorithm is superior to the traditional ACO algorithm.

关键词： DPBAC algorithm ant colony optimization algorithm single-machine scheduling problem setup time

Automatic Generation of setup for CNC Spring Coiler Based on Case-based Reasoning

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武汉理工大学学报 2006年第S3期28卷 1016-1019页

作者： KU Xiangchen~(1,2) WANG Runxiao~1 LI Jishun~2 WANG Dongbo~1 (1.School of Mechatronics Engineering,Northwestern Polytechnical University,Xi’an 710072,China, 2.School of Mechatronics Engineering,Henan University of Science and Technology,Lnoyang 471003,China) School of Mechatronics Engineering Northwestern Polytechnical UniversityXi'an 710072China School of Mechatronics Engineering Henan University of Science and TechnologyLuoyang 471003China School of Mechatronics Engineering Northwestern Polytechnical UniversityXi'an 710072China School of Mechatronics Engineering Henan University of Science and TechnologyLuoyang 471003China

When producing special-shape spring in CNC spring coiler,the setup of the coiler is often a manual work using a trial-and-error *** a result,the setup of coiler consumes so much time and becomes the bottleneck of the spring production *** order to cope with this situation,this paper proposes an automatic generation system of setup for CNC spring coiler us- ing case-based reasoning(CBR).The core of the study contains:(1)integrated reasoning model of CBR system;(2)spatial shape describe of special-shape spring based on feature;(3)coiling case representation using shape feature matrix;and(4)case similari- ty measure *** automatic generation system has implemented with C++Builder 6.0 and is helpful in improving the automaticity and efficiency of spring coiler.

关键词： case-based reasoning CNC spring coiler setup automatic generation shape feature

Changes in the investment and the setup of production and sales in the auto industry

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中国汽车（英文版） 2003年第8期 14-19页

In 2002, the total investment in fixed assets of the auto industry was over 300 billion yuan. But the problems of investment scattering and insufficient R & D capabilities have not been resolved, which will restrain t... 详细信息

关键词： assets restrain insufficient quarter Nissan Ningbo setup indust suffered Sunny

Single Machine Scheduling Problem with Controllable setup and Job Processing Times and Position-Dependent Workloads

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Single Machine Scheduling Problem with Controllable Setup an...

Application of Variance Component Analysis (ANOVA) in setup Errors and PTV Margins for Lung Cancer with Stereotactic Body Radiation Therapy (SBRT)

作者： Chengxin Luo Geng Zhang Department of basic courses Guangdong University of science and technology

This paper concerns with a single-machine scheduling problem in which each job has a setup before being processed,the setup time and the processing time of jobs are controllable by allocating a continuously nonrenewable resource,*** is different from that of [13],in which a job only has a processing time,but without a setup *** assume that each setup and processing time of jobs has a workload that is both job and *** the problem investigated,the total amount of resource for setup and processing times does not exceed an up bound,*** objective is to determine the setup sequence,the job sequence and the resource allocation scheme to minimize *** show that the problem can be solved in polynomial time and present an optimal algorithm.

关键词： Scheduling setup Position-dependent workload Makespan Resource assumption

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2018年第4期7卷 522-538页

作者： Xiaotian Huang Jun Zhang Conghua Xie Yunfeng Zhou Hong Quan School of Physics and Technology Wuhan University Wuhan China Department of Radiation and Medical Oncology Zhongnan Hospital of Wuhan University Wuhan China

Purpose: To investigate the feasibility of applying ANOVA newly proposed by Yukinori to verify the setup errors, PTV (Planning Target Volume) margins, DVH for lung cancer with SBRT. Methods: 20 patients receiving SBRT to 50 Gy in 5 fractions with a Varian iX linear acceleration were selected. Each patient was scanned with kV-CBCT before the daily treatment to verify the setup position. Two other error calculation methods raised by Van Herk and Remeijer were also compared to discover the statistical difference in systematic errors (Σ), random errors (σ), PTV margins and DVH. Results: Utilizing two PTV margin calculation formulas (Stroom, Van Herk), PTV calculated by Yukinori method in three directions were (5.89 and 3.95), (5.54 and 3.55), (3.24 and 0.78) mm;Van Herk method were (6.10 and 4.25), (5.73 and 3.83), (3.51 and 1.13) mm;Remeijer method were (6.39 and 4.57), (5.98 and 4.10), (3.69 and 1.33) mm. The volumes of PTV using Yukinori method were significantly smaller (P 0.05) among three methods. Conclusions: In lung SBRT treatment, due to fraction reduction and high level of dose per fraction, ANOVA was able to offset the effect of random factors in systematic errors, reducing the PTV margins and volumes. However, no distinct dose distribution improvement was founded in target volume and organs at risk.

关键词： SBRT KV-CBCT PTV Margin setup Errors DVH