Progress and recent trend in MILD combustion

Moderate or intense low oxygen dilution(MILD)combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs.However,due to the lack of the fundamental knowledge on this combustion,there is a misconception that MILD combustion should be established by high preheating of the air,which has limited its application.Our research and development on this combustion has been performed for several years. We have found that the requ...     

Preparation of Gd_(0.3)Ce_(0.7)O_(1.85-x) Single Buffer Layer for Coated Conductor Using a Novel-PACSD Method

To increase the critical thickness of CeO2 single buffer layer, the polymer assisted chemical solution deposition (PACSD) approach has been adopted to prepare a single buffer layer of Gd0.3Ce0.7O1.85-x (GCO) on bi-axially textured Ni-5%W alloy substrate, and the influences of different annealing temperatures on texture and microstructure of the buffer layer has also been studied in this paper. The results demonstrate that a well textured, dense and smooth GCO single buffer layer with thickness of 180 nm has...     

INVESTIGATION OF DOMINANT FREQUENCIES IN TRANSITION REYNOLDS NUMBER RANGE OF FLOW AROUND A CIRCULAR CYLINDER PARTⅡ: THEORETICAL DETERMINATION OF THE RELATIONSHIP BETWEEN VORTEX SHEDDING AND TRANSITION FREQUENCIES AT DIFFERENT REYNOLDS NUMBERS

An attempt has been made to explore whether the power relation can be obtained from theoretical considerations. The classical laminar and turbulent boundary layer concepts have been employed to determine appropriate values of the scaling lengths associated with vortex shedding and shear layer frequencies to predict the power law relationship with Reynolds number. The predicted results are in good agreement with experimental results. The findings will provide a greater insight into the overall phenomenon involved.     

龙凤呈祥

介绍了我们在设计中如何充分运用传统文化元素,在原有龙形水系基础上创造了凤凰山这景观造型,以体现龙凤呈祥的主题;通过绿色游憩空间的规划设计、各种设施的建立和完善的管理,希望创造一个愉快、舒适、安全的观赛和游览环境;制定各种可持续运营措施、运用相关新技术,以恢复和重建奥林匹克公园园区生态环境.充分发挥"绿色奥运,科技奥运和人文奥运"理念.     

THE EROSIVE PROCESS IN ABRASIVE WATERJET CUTTING OF POLYMER MATRIX COMPOSITES

１．ＩｎｔｒｏｄｕｃｔｉｏｎＤｕｅｔｏｔｈｅｉｒｓｕｐｅｒｉｏｒｐｈｙｓｉｃａｌａｎｄｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓ,ｐｏｌｙｍｅｒｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓ（ＰＭＣ）ａｒｅｂｅｉｎｇｉｎｃｒｅａｓｉｎｇｌｙｕｓｅｄｉｎｉｎｄｕｓｔｒｙ．Ｈｏｗｅｖｅｒ,ｔｈｅｐｒｏｃｅｓｓｉｎｇｏｆｔｈｅｓｅｍａｔｅｒｉａｌｓｉｓｓｔｉｌｌｌｉｍｉｔｅｄｔｏｔｈｅｔｒａｄｉｔｉｏｎａｌｂａｎｄｓａｗｃｕｔｔｉｎｇ．Ｔｈｉｓｐｒｏｃｅｓｓｉｓａｓｓｏｃｉａｔｅｄｗｉｔｈｌｏｗｃｕｔｑｕａｌｉｔｙ,…     

COMPUTATIONAL SCHEME FOR SIMULATING PLASMA DYNAM-ICS DURING PLASMA-IMMERSION ION IMPLANTATION

Plasma--immersionionimplantation(Pill)isapowerfultechniqueforsurfacemodificationofmaterials[1'2].InthePillprocess)theobjectbeingimplantedisimmersedinaplasmaandrepeatedlypulsedtoahigh,negativevoltage(scallto--100kV).AtypicaltargetgeometryisshowninFig.la.Theapplicationofthisbiascreatesasheaththatexpandsintothesurroundingplasma,uncoveringpositiveionsandacceleratingthemtothetargetsurfaCe,wheretheymaybeimplanted.Theseimplantedionsmodifythesurfacewhiletightdimensionaltolerancesaremaintained.Aprin…     

澳大利亚水资源管理及水权制度建设的经验与启示

根据赴澳大利亚水资源的现状、管理体制的考察和学习,总结澳洲水资源管理和水权制度建设的经验,针对目前江西水权制度建设工作提出建议。     

Petrological characteristics,geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province,China

The alkali-rich rocks,spreading along the suture zone of Jingsha River,refer to the alkali-rich porphyry rocks,which emplace during the Himalaya epoch in northwest of Yunnan Province,and consist of syenit,syenit porphyry,monzonite porphyry and granite porphyry.Petrological chemical analysis results suggest that silica is poor and aluminum is rich,and high potassium large ion lithophile elements(LILE),light rare earth element(LREE) and Sr are obviously detracted in these rocks.High field strength elements(HF...     

确定学习与基于数据的建模及控制

确定学习运用自适应控制和动力学系统的概念与方法, 研究未知动态环境下的知识获取、表达、存储和利用等问题. 针对产生周期或回归轨迹的连续 非线性动态系统, 确定学习可以对其未知系统动态进行局部准确建模, 其基本要 素包括: 1)使用径向基函数(Radial basis function, RBF)神经网络; 2)对于周期(或回归)状态轨迹 满足部分持续激励条件; 3)在周期(或回归)轨迹的邻域内实现对非线性系统动态的局部准确神经网络逼近(局部准确建模); 4)所学的知识以时不变且空间分布的方式表达、以常值神经网络权值的方式存储, 并可在动态环境下用于动态模式的快速识别或者闭环神经网络控制. 本文针对离散动态系统, 扩展了确定学习理论, 提出一个根据时态数据序列对离散动态系统进行建模与控制的框架. 首先, 运用确定学习原理和离散系统的自适应辨识方法, 实现对产生时态数据的离散非线性系统的未知动态进行局部准确的神经网络建模, 并利用此建模结果对时态数据序列进行时不变表达. 其次, 提出时态数据序列的基于动力学的相似性定义, 以及对离散动态系统产生的时态数据序列(亦可称为动态模式)进行快速识别方法. 最后, 针对离散非线性控制系统, 实现了基于时态数据序列对控制系统动态的闭环辨识(局部准确建模). 所学关于闭环动态的知识可用于基于模式的智能控制. 本文表明确定学习可以为时态数据挖掘的研究提供新的途径, 并为基于数据的建模与控制等问题提供新的研究思路.     

Preparation of La-Ni Based Alloys Used in Ni-Metal Hydride Bateries by Mechanical Alloying

ＰｒｅｐａｒａｔｉｏｎｏｆＬａＮｉＢａｓｅｄＡｌｏｙｓＵｓｅｄｉｎＮｉＭｅｔａｌＨｙｄｒｉｄｅＢａｔｅｒｉｅｓｂｙＭｅｃｈａｎｉｃａｌＡｌｏｙｉｎｇＬｉＤｏｎｇｐｅｉ，ＹｉｎｇＱｉｍｉｎｇ，ＺｈａｎｇＪｉａｎ（李东培）（应启明）（张健）Ｇｅｎｅｒ...