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排序方式: 共有217条查询结果,搜索用时 15 毫秒
1.
介绍Excel2 0 0 0与普通的计算法相结合 ,AutoCAD2 0 0 4与普通的图解法相结合的方法快速、准确获取高炉壳圆锥管段下料所需数据 ,以供人工号料 ,半自动切割或数控切割。 相似文献
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The effect of SO2 on catalytic activity for NO reduction to N2 by methanol in excess oxygen over $\gamma$ -alumina has been investigated. SCR activity increased initially upon exposure of a fresh $\gamma$ -alumina catalyst to SO2 which is attributed to formation of Brønsted acid sites. Longer exposure to SO2 leads to a decline in catalytic activity to a lower steady-state NOx reduction activity which is independent of the SO2 content in the feed gas. 相似文献
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We address the problem of robust and efficient treatment of element collapse and inversion in corotational FEM simulations of deformable objects in two and three dimensions, and show that existing degeneration treatment methods have previously unreported flaws that seriously threaten robustness and physical plausibility in interactive applications. We propose a new method that avoids such flaws, yields faster and smoother degeneration recovery and extends the range of well‐behaved degenerate configurations without adding significant complexity or computational cost to standard explicit and quasi‐implicit solvers. 相似文献
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Multi‐dimensional data originate from many different sources and are relevant for many applications. One specific sub‐type of such data is continuous trajectory data in multi‐dimensional state spaces of complex systems. We adapt the concept of spatially continuous scatterplots and spatially continuous parallel coordinate plots to such trajectory data, leading to continuous‐time scatterplots and continuous‐time parallel coordinates. Together with a temporal heat map representation, we design coordinated views for visual analysis and interactive exploration. We demonstrate the usefulness of our visualization approach for three case studies that cover examples of complex dynamic systems: cyber‐physical systems consisting of heterogeneous sensors and actuators networks (the collection of time‐dependent sensor network data of an exemplary smart home environment), the dynamics of robot arm movement and motion characteristics of humanoids. 相似文献
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Protel DXP 2004软件是一款应用广泛的印制电路板设计软件,学习该软件比较容易入门,但是要熟练掌握并且灵活处理软件使用中的常见问题并非易事。从电气规则检查、载入网络表、制作元件封装等方面,分析Protel DXP 2004软件操作中的常见问题及产生原因,并提出了解决这些问题的方法。 相似文献
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Vegetation water content during SMEX04 from ground data and Landsat 5 Thematic Mapper imagery 总被引:1,自引:0,他引:1
M. Tugrul Yilmaz Lyssa D. Goins Vern C. Vanderbilt 《Remote sensing of environment》2008,112(2):350-362
Vegetation water content is an important parameter for retrieval of soil moisture from microwave data and for other remote sensing applications. Because liquid water absorbs in the shortwave infrared, the normalized difference infrared index (NDII), calculated from Landsat 5 Thematic Mapper band 4 (0.76-0.90 μm wavelength) and band 5 (1.55-1.65 μm wavelength), can be used to determine canopy equivalent water thickness (EWT), which is defined as the water volume per leaf area times the leaf area index (LAI). Alternatively, average canopy EWT can be determined using a landcover classification, because different vegetation types have different average LAI at the peak of the growing season. The primary contribution of this study for the Soil Moisture Experiment 2004 was to sample vegetation for the Arizona and Sonora study areas. Vegetation was sampled to achieve a range of canopy EWT; LAI was measured using a plant canopy analyzer and digital hemispherical (fisheye) photographs. NDII was linearly related to measured canopy EWT with an R2 of 0.601. Landcover of the Arizona, USA, and Sonora, Mexico, study areas were classified with an overall accuracy of 70% using a rule-based decision tree using three dates of Landsat 5 Thematic Mapper imagery and digital elevation data. There was a large range of NDII per landcover class at the peak of the growing season, indicating that canopy EWT should be estimated directly using NDII or other shortwave-infrared vegetation indices. However, landcover classifications will still be necessary to obtain total vegetation water content from canopy EWT and other data, because considerable liquid water is contained in the non-foliar components of vegetation. 相似文献
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传统的信息发布系统主要是通过采用网页编辑工具结合编写某种动态技术的源代码来实现的,本文详细的介绍了如何通过Dreamweaver MX 2004的操作来代替手写代码,进而实现基于ASP技术的信息发布系统. 相似文献