检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

英语特殊隐喻研究及其汉译

上海翻译 2009年第1期 15-19页

作者：傅敬民上海商学院外语学院上海201400

英汉语言在表达相同信息时,由于思维视角的不同,往往会采用不同的表达取向。其中,英汉在隐喻的使用上就存在诸多方面的差异。本文以英语中特殊隐喻为研究对象,在分析探讨英语特殊英语隐喻存在理据的同时,结合汉译中存在的问题,对英语特... 详细信息

英汉语言在表达相同信息时,由于思维视角的不同,往往会采用不同的表达取向。其中,英汉在隐喻的使用上就存在诸多方面的差异。本文以英语中特殊隐喻为研究对象,在分析探讨英语特殊英语隐喻存在理据的同时,结合汉译中存在的问题,对英语特殊隐喻的汉译予以思维视角的探讨。本文认为,英语特殊隐喻的汉译同样存在着由于两种语言与思维所存在的差异而带来的问题,在汉译时必须按照汉语的语言机制和思维习惯做不同的处理。

关键词：隐喻语言思维翻译

Trajectory Planning for Automated Driving Based on Ordinal Optimization

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2017年第1期22卷 62-72页

作者： Xiaoxin fu Yongheng Jiang Dexian Huang Kaisheng Huang jingchun Wang Department of Automation Tsinghua UniversityBeijing 100084 China Department of Automobile Engineering Tsinghua UniversityBeijing 100084 China

This paper proposes an approach based on Ordinal Optimization（OO） to solve trajectory planning for automated driving. As most planning approaches based on candidate curves optimize the trajectory curve and the velocity profile separately, this paper formulates the problem as an unified Non-Linear Programming（NLP） model,optimizing the trajectory curve and the acceleration profile（acceleration is the derivative of velocity） *** a hybrid optimization algorithm named OODE, developed by combining the idea of OO and Differential Evolution（DE）, is proposed to solve the NLP model. With the acceleration profile optimized ＂roughly＂, OODE computes and compares ＂rough＂（biased but computationally-easier） curve evaluations to select the best curve from candidates, so that a good enough curve can be obtained very efficiently. Then the acceleration profile is optimized again ＂accurately＂ with the selected curve. Simulation results show that good enough solutions are ensured with a high probability and our method is capable of working in real time.

关键词： ordinal optimization trajectory planning automated driving autonomous vehicle rough evaluation

Preparation of Polylactide Composite with Excellent Flame Retardance and Improved Mechanical Properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第12期36卷 1385-1393页

作者： Chu-Bo Sun Hong-Da Mao Feng Chen Qiang fu College of Polymer Science and Engineering Sichuan University State Key Laboratory of Polymer Materials Engineering

Despite the good biodegradable and mechanical properties, poly（lactic acid） still suffers from a highly inherent flammability, which restricts its applications in the electric and automobile fields. In order to improve the flame retardancy of PLA, in this work, melamine polyphosphate （MPP） and zinc bisdiethylphosphinate （ZnPi） were firstly incorporated into PLA, and the synergistic effect of them on flame retardance of PLA was investigated using limiting oxygen index （LOI）, UL-94 vertical measurement, scanning electron microscopy （SEM） and cone calorimeter tests etc. The results showed that PLA composite with 15 wt% of MPP/ZnPi （3：2） had the best flame-retardant efficiency with LOI value of 30.1 and V0 rating in UL-94 tests, which was far better than using MPP or ZnPi alone. What is more, although a wide range of flame retardants have been developed to reduce the flammability, so far, they normally compromise the mechanical properties of PLA. On the premise of maintaining good fiame-retardant performance, we improved the toughness of flame- retardant PLA composite, and the impact strength of flame-retardant PLA composite was more than tripled （8.08 kJ/m2） by adding thermoplastic urethanes （TPU）. This work offers an innovative method for the design of the unique integration of extraordinary flame retardancy and toughening reinforcement for PLA materials.

关键词： Synergistic effect Flame retardant Poly(lactic acid) Impact strength

Microstructure and Anticorrosion Property of AT13 Coatings Made by Combination of Nanoparticles Doping and Plasma Spraying Technique

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第05B期25卷 964-969页

作者： LIChun-fu DAIJia-lin WANGBin ZHANGYing HETao-e LUOPing-ya StatekeyLaboratoryofOilandGasReservoirGeologyandExploitation（SouthwestPetroleumInstitute ChengduChina）／／MaterialScienceandEngi8neeringCollegeSouthwestPetroleumInstituteChengduChina MaterialScienceandEngi8neeringCollege SouthwestPetroleumInstituteChengduChina

Al2O3+13wt%TiO2 (AT13) particles were doped with 5%～30% nanoparticles and prefabricating powders were prepared by renewed granulation. AT13 coatings were prepared on the surface of steel 45# by air plasma spraying technique with the prefabricating powders. The microstructures of the AT13 prefabricating powders and the resulting coatings were investigated by SEM and EDS and XRD. The samples were undergone corrosion in the medium of 10% H2SO4 aqueous solution at temperature 80℃. The results indicate that the blistering time of coatings in the corrosive medium was increased with the increase of doped nanoparticle concentration while the time from blistering to spalling is independent of nanoparticle concentration. The results revealed that the structure of prefabricating powders was a twisted micrometer grade particle with dimension of 40-60μm, encapsulated by nanoparticles. The homogeneity of element distribution in coatings was improved and porosity was reduced. The phases of (Al2O3) 5.333 and orthorhombic Al2TiO5 were identified . The fracture analysis confirmed that there is a large amount of vermiculate whiskers with diameter of 10nm and length of 100～200 nm in coatings and the fracture type of coatings was the ductile trans-granular fracture.

关键词：显微结构等离子喷涂纳米颗粒掺杂防腐性能 AT13涂层

Combinatorial Optimization of Ba/Fe-cordierite Solid Solution （Ba0.05Fe0.1Mg）2Al4Si5O18 for High Infrared Radiance Materials

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2012年第3期25卷 345-351,374页

作者： fu-han Tang Jian-dong Zhuang Fan Fei Qian Liu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences ShanEhai 200050 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

A combinatorial chemistry method was employed to screen the Ba2＋ and Fe3＋ incorporated into cordierite structure （Ba0.05Fe0.1Mg）2A14Si5018 for exploring of high infrared radiance materials. A series of square-type sample array that consists of 7×7 compositions was syn- thesized by ink-jetting nitrate solutions into micro-reactor wells in a ceramic plate and then heat-treated at high temperatures. X-ray diffraction and infrared thermograph were used to analyze the effects of Ba2＋/Fe3＋ incorporating on the lattice distortion of cordierite and resultant changes in infrared radiance properties. Based on the results of X-ray phase analy- sis and radiance measurement of the scale-up prepared samples, the optimal Ba2＋ and Fe3＋ co-adding amount was determined to be 5%Ba2＋ plus 10%Fe3＋. Moreover, the infrared emissivity of the optimal composition at 100 ℃ was found to be higher than 0.8 in a wide wavelength range of 5-24μm. The research work demonstrates a promising application of Ba2＋/Fe3＋ cordierite solid solution as a kind of infrared heating materials for energy saving.

关键词： Cordierite Solid solution Combinatorial ink-jetting solution Infrared radiance enhancement

Active generalized predictive control of turbine tip clearance for aero-engines

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2013年第5期26卷 1147-1155页

作者： Peng Kai Fan Ding Yang Fan fu Qiang Li Yong School of Power and Energy Northwestern Polytechnical University Aeronautics and Astronautics Engineering College Air Force Engineering University School of Flight Technology Civil Aviation Flight University of China

Active control of turbine blade tip clearance continues to be a concern in design and control of gas turbines. Ever increasing demands for improved efficiency and higher operating temperatures require more stringent tolerances on turbine tip clearance. In this paper, a turbine tip clearance control apparatus and a model of turbine tip clearance are proposed; an implicit active generalized predictive control （GPC）, with auto-regressive （AR） error modification and fuzzy adjustment on control horizon, is presented, as well as a quantitative analysis method of robust per- turbation radius of the system. The active clearance control （ACC） of aero-engine turbine tip clear- ance is evaluated in a lapse-rate take-off transient, along with the comparative and quantitative analysis of the stability and robustness of the active tip clearance control system. The results show that the resultant active tip clearance control system with the improved GPC has favorable steadystate and dynamic performance and benefits of increased efficiency, reduced specific fuel consump- tion, and additional service life.

关键词： Active clearance control(ACC) Aero-engine Aircraft Generalized prcdictivc control (GPC) Global convergence Robust perturbation radius Turbine tip clearance

Layered virtual machine migration algorithm for network resource balancing in cloud computing

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2018年第1期12卷 75-85页

作者： Xiong fu Juzhou CHEN Song DENG Junchang WANG Lin ZHANG School of Computer and Technology Nanjing University of Posts and Telecommunications Nanjing 210023 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210023 China Institute of Advanced Technology Nanjing University of Posts and Telecommunications Nanjing 210023 China

Due to the increasing sizes of cloud data centers, the number of virtual machines （VMs） and applications rises quickly. The rapid growth of large scale Internet services re- suits in unbalanced load of network resource. The bandwidth utilization rate of some physical hosts is too high, and this causes network congestion. This paper presents a layered VM migration algorithm （LVMM）. At first, the algorithm will divide the cloud data center into several regions according to the bandwidth utilization rate of the hosts. Then we bal- ance the load of network resource of each region by VM migrations, and ultimately achieve the load balance of net- work resource in the cloud data center. Through simulation experiments in different environments, it is proved that the LVMM algorithm can effectively balance the load of network resource in cloud computing.

关键词： virtual machine migration cloud computing,layered theory load balancing

Temporal and spatial changes in nutrients and chlorophyll-a in a shallow lake,Lake Chaohu, China: An 11-year investigation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第6期25卷 1117-1123页

作者： Libiao Yang Kun Lei Wei Meng Guo fu Weijin Yan River and Coastal Environment Research Center Chinese Research Academy of Environmental Sciences Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Temporal and spatial changes of total nitrogen （TN）, total phosphorus （TP） and chlorophyll-a （Chl-a） in a shallow lake, Lake Chaohu, China, were investigated using monthly monitoring data from 2001 through 2011. The results showed that the annual mean concentration ranges of TN, TP, and Chl-a were 0.08-14.60 mg/L, 0.02-1.08 mg/L, and 0.10-465.90 ~tg/L, respectively. Our data showed that Lake Chaohu was highly eutrophic and that water quality showed no substantial improvement during 2001 through 2011. The mean concentrations of TP, TN and Chl-a in the western lake were significantly higher than in the eastern lake, which indicates a spatial distribution of the three water parameters. The annual mean ratio of TN：TP by weight ranged from 10 to 20, indicating that phosphorus was the limiting nutrient in this lake. A similar seasonality variation for TP and Chl-a was observed. Riverine TP and NH4＋ loading from eight major tributaries were in the range of 1.56× 10^4-5.47 × 10^4 and 0.19 × 104-0.51 × 10^4 tons/yr over 2002-2011, respectively, and exceeded the water environmental capability of the two nutrients in the lake by a factor of 3-6. Thus reduction of nutrient loading in the sub-watershed and tributaries would be essential for the restoration of Lake Chaohu.

关键词： eutrophication Lake Chaohu nitrogen phosphorus

基于人工靶向免疫疗法的红外手部痕迹目标提取

在线全文

学校读者我要写书评

暂无评论

电子与信息学报 2018年第2期40卷 346-352页

作者：付冬梅孙静杨焘北京科技大学自动化学院北京100083

红外手部热痕迹图像是特殊的模糊图像,该文提出一种人工靶向免疫疗法对其进行手部目标提取。首先依据序列图像中像素灰度的变化趋势设计了先天性免疫识别进行初分割;然后借鉴免疫的提呈机制,根据热扩散特性定义同心圆模板提取特征;基于... 详细信息

红外手部热痕迹图像是特殊的模糊图像,该文提出一种人工靶向免疫疗法对其进行手部目标提取。首先依据序列图像中像素灰度的变化趋势设计了先天性免疫识别进行初分割;然后借鉴免疫的提呈机制,根据热扩散特性定义同心圆模板提取特征;基于模板特征对模糊像素集适应性免疫识别;最后,指尖指谷病变检测分析,实施靶向治疗,保证了手的形态特征。与分水岭、SOM网络以及近几年研究成果进行了比较,表明提出的算法在目标提取率、绝对误差率均优于现有算法,提取结果更符合手的形态,同时扩展了应用热痕迹信息的时间跨度。

关键词：模糊红外图像模板特征免疫网络靶向免疫疗法