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基于火焰发射光谱的转动温度和振动温度的测量

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物理学报 2011年第10期60卷 454-460页

作者：彭志敏丁艳军翟晓东清华大学热能系电力系统与发电设备控制与仿真国家重点实验室北京100084

利用光学多通道分析仪(OMA)对酒精和煤油在大气中燃烧时的火焰发射光谱进行了分析.实验发现上述火焰发射光谱在275—600nm波段范围内存在多支辐射强度很大的带状分子光谱,其中以OH自由基A2Σ+→X2Πr(300—330nm),CH自由基A2Δ→X2Π(41... 详细信息

利用光学多通道分析仪(OMA)对酒精和煤油在大气中燃烧时的火焰发射光谱进行了分析.实验发现上述火焰发射光谱在275—600nm波段范围内存在多支辐射强度很大的带状分子光谱,其中以OH自由基A2Σ+→X2Πr(300—330nm),CH自由基A2Δ→X2Π(410—440nm)和C2自由基A3Πg→X3Πu(500—520nm)电子带系的发射光谱最为强烈.实验中采用高分辨率光栅对OH自由基A2Σ+→X2Πr和CH自由基A2Δ→X2Π电子带系发射光谱的精细结构进行了分析.与此同时,本文基于分子光谱理论计算了不同转动温度和振动温度条件下OH自由基A2Σ+→X2Πr和CH自由基A2Δ→X2Π电子带系发射光谱的强度分布,同时通过理论计算光谱和实验光谱进行比较确定了酒精燃烧火焰的转动温度和振动温度.

关键词：火焰发射光谱谱线强度转动温度振动温度

The extended McEvily model for fatigue crack growth analysis of Metal Structures

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The extended McEvily model for fatigue crack growth analysis...

2007年船舶力学学术会议暨《船舶力学》创刊十周年纪念学术会议

作者： Wang Yi-fei~1 Cui Wei-cheng~2 Wu Xiao-yuan~1 Wang Fang~1 Huang Xiao-ping~1 1 state key laboratory of Ocean engineering,Shanghai Jiao Tong university,Shanghai 200030,china 2 china Ship Scientific Research Center,Wuxi 214082,china

An extended McEvily model for fatigue crack growth analysis of metal structures is proposed in this *** comparing with the previous work,the extension is mainly concerned with the following two aspects:(1) the slope of the fatigue crack growth rate curve is regarded as a variable rather than a fixed value for different materials;(2)both the maximum stress intensity factor at the crack opening level,K and the effective stress intensity factor range at the threshold level,ΔK are functions of load ratio,R and they are determined by the curve fitting *** indicate that the value of K tends to decrease slightly as load ratio increases where crack closure is experimentally *** to the present data obtained through the nonlinear least squares fitting method and discussions on the experimental results in the published literature,the parameter ΔK increases with increasing load ratios where crack closure exists and decreases at high load ratios where the experimental data are closure *** method is also put forward in this paper to determine material constants in the crack growth rate *** between the predicted results and the corresponding experimental data with different load ratios reveals that the extended McEvily model can account for the load ratio effect *** on the previous work this model can also be expected to explain other fatigue phenomena.

关键词： fatigue crack growth threshold effective stress intensity factor range load ratio crack closure

Decision System for Geological Disaster Using Artificial Neural Network and GIS

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Decision System for Geological Disaster Using Artificial Neu...

2011 4th IEEE International Conference on Computer Science and Information Technology(ICCSIT 2011)

作者： Baiyan Su and Qiang Xu state key laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu university of Technology Chengdu 610059 china

Geological hazards are very harmful for human life. To measure the hazards and made correct decisions,this paper designs a decision system based on artificial neural network and Geographic Information System（GIS）.To improve the performance of the neural network,a novel differential evolution algorithm is used to train the connecting weights. The system makes full use of the functions of GIS and neural network,and is capable of visualization evaluation for the hazards.

关键词： geological disaster artificial neural network GIS decision system

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锅炉类型与粉煤灰的物相特征

同济大学学报（自然科学版） 2003年第8期31卷 990-994页

作者：刘芳顾国维韩作振同济大学污染控制与资源化研究国家重点实验室上海200092 山东科技大学地球科学信息与工程学院山东泰安271019

介绍了沸腾炉与煤粉炉的类型以及煤粒的燃烧方式 ,探讨了燃料中的矿物质在锅炉中的相转变过程 ,并利用X射线衍射仪分析了燃煤电厂和矸石、煤泥电厂所用燃料及所排粉煤灰的物相特征 .经分析发现 ,燃煤电厂产生的粉煤灰中物相组分以非晶... 详细信息

介绍了沸腾炉与煤粉炉的类型以及煤粒的燃烧方式 ,探讨了燃料中的矿物质在锅炉中的相转变过程 ,并利用X射线衍射仪分析了燃煤电厂和矸石、煤泥电厂所用燃料及所排粉煤灰的物相特征 .经分析发现 ,燃煤电厂产生的粉煤灰中物相组分以非晶质的玻璃体为主 ,另外含有石英、莫来石及少量长石等 ;而煤泥电厂与矸石电厂产生的粉煤灰中虽也含有玻璃体 ,但数量相对较少 ,矿物质是以石英为主 ,此外还含有长石。

关键词：沸腾炉煤粉炉锅炉类型粉煤灰物相特征煤粒燃烧方式物相组分相转变

OPTICAL ABSORPTION OF CO-DOPED SILICA GEL-DERIVED GLASSES

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OPTICAL ABSORPTION OF CO-DOPED SILICA GEL-DERIVED GLASSES

第8届国际材联电子材料国际研讨会

作者： XX.Duan, D.R.Yuan state key laboratory of Crystal Materials, Shandong university, Jinan 250100, china

Materials doped with transition metal cobalt (Ⅱ) ions (Co) present different colors when Co ions located in different symmetry sites, so cobalt can be used as a "color indicator". Furthermore, Co ions can act as one kind of active ions in many materials. A number of materials doped with Co ions are used as passive Q switches or tunable laser in the near-infrared region because they possess saturable absorption or exhibit strong and broad luminescence hands In this paper we mainly discussed the (?)

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CASE-BASED REASONING IN PRODUCT INNOVATION DESIGN

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CASE-BASED REASONING IN PRODUCT INNOVATION DESIGN

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： WANG Wei, ZHAO Jianghong state key laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan university, Changsha, 410082, china

The present research depicts the process and patterns of product innovation design with case-based reasoning (CBR) by a cognitive approach. By using protocol analysis and sketch analysis, the present

关键词： Product design design innovation CAD case-based reasoning cognition experiment.

RESEARCH ON A METHOD OF INJECTION MOLDING MACHINE CONFIGURATION DESIGN BASED ON INSTANCES

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RESEARCH ON A METHOD OF INJECTION MOLDING MACHINE CONFIGURAT...

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： WEI Zhe, TAN Jianrong, FENG Yixiong *state key laboratory of CAD&CG, Zhejiang university, Hangzhou 310027, china

To reduce the repeated work during the configuration design of injection molding machine and to improve the configuration design efficiency of the product which is complex, single-designed and individ

关键词： Configuration design instance system integration function interference injection molding machine.

NEW 3D LINE CLIPPING ALGORITHM AGAINST SPHERICAL SURFACE WINDOW

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NEW 3D LINE CLIPPING ALGORITHM AGAINST SPHERICAL SURFACE WIN...

International Technology and Innovation Conference 2006

作者： DENG Weiyan LU Guodong CHEN Long state key laboratory of CAD&CG Zhejiang university Hangzhou 310027 china

＜正＞A new method for 3D（three dimensional） line clipping against spherical surface window is presented. The new approach will play an important role in 3D clothing design and clipping. To reduce the times of judgment of the correlativity between lines and the spherical surface window, a new concept of projecting encoding is put forward. By projecting the circumscribed-cube and the circumscribed- dodecahedron of the spherical surface window to the 2D（two dimensional） coordinate system respective, 3D line clipping can be simplified to 2D line clipping, then six-figure code of the line which to be clipped can be simplified to four-figure code. What is more significant, most of the line segments that are completely outside of the window can be quickly discarded by projecting encoding. At the same time, Comparing the generalized distance and generalized height with the radius of sphere, all the line segments that are completely inside of the window and the remaining lines that are outside of the window can also be quickly identified. At last, the efficiency of the new algorithm established in this paper is compared with the efficiency of the common method. Experiment results show that the new algorithm has a higher efficiency and a better stability.

关键词： Spherical surface window 3D line clipping circumscribed-cube circumscribed-dodecahedron projecting encoding.

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一个工作流定义工具的设计及实现

计算机工程与应用 2004年第15期40卷 110-113页

作者：严芬殷新春扬州大学工学院计算机科学与工程系扬州225009

该文介绍了一个适合于软件企业定义其项目开发流程的,基于图形方式的工作流定义工具的设计及实现。该工具是根据软件企业达到CMM三级标准的要求和对软件开发过程进行管理的一般思想来考虑的。

关键词：工作流流程定义 CMM 项目过程定义标准过程过程裁剪