用ASP.NET和C#动态绘制WEB震中分布图的一种方法

简述了NET、ASP．NET的特性及绘制图形的基本原理,介绍在地震目录查询服务中采用ASP．NET与C#,实现通过网页动态绘制地震震中分布图的一种方法。     

3D COMPUTER SIMULATION FOR LIGNIFICATION OF ANCIENT CHINESE TIMBER BUILDINGS

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅａｒｔｏｆａｎｃｉｅｎｔＣｈｉｎｅｓｅａｒｃｈｉｔｅｃｔｕｒｅｉｓｔｈｅｅｓｓｅｎｃｅｏｆｔｈｅＣｈｉｎｅｓｅｃｕｌｔｕｒａｌｈｅｒｉｔａｇｅｓ .Ｉｔｈａｓｉｍ ｐｏｒｔａｎｔｓｉｇｎｉｆｉｃａｎｃｅｆｏｒｓｔｕｄｙｉｎｇａｎｄｌｅａｒｎｉｎｇＣｈｉ ｎｅｓｅｃｕｌｔｕｒｅａｎｄｃｉｖｉｌｉｚａｔｉｏｎ .Ｉｔｉｓｏｆｇｒｅａｔｄｉｆｆｉｃｕｌ ｔｙ ,ｈｏｗｅｖｅｒ,ｔｏｌｅａｒｎｔｈｅｃｏｍｐｌｉｃａｔｅｄｓｔｒｕｃｔｕｒｅｏｆａｎｃｉｅｎｔＣｈｉｎｅｓｅａｒｃｈｉ…     

Estimating forest standing biomass in savanna woodlands as an indicator of forest productivity using the new generation WorldView-2 sensor

Accurate and up-to-date information on forest dendrometric traits, such as above ground biomass is important in understanding the contribution of terrestrial ecosystems to the regulation of atmsopheric carbon, especially in the face of global environmental change. Besides, dendrometric traits information is critical in assessing the healthy and the spatial planning of fragile ecosystems, such as the savanna dry forests. The aim of this work was to test whether red-edge spectral data derived from WorldView-2 multispectral imagery improve biomass estimation in savanna dry forests. The results of this study have shown that biomass estimation using all Worldview-2 raw spectral bands without the red-edge band yielded low estimation accuracies (R² of 0.67 and a RMSE-CV of 2.2 t ha^?1) when compared to when the red-edge band was included as a co-variate (R² of 0.73 and a RMSE-CV of 2.04 t ha^?1). Also, similar results were obseved when all WorldView-2 vegetation indices (without the red-edge computed ones), producing slightly low accuracies (R² of about 0.67 and a RMSE-CV of 2.20 t ha^?1), when compared to those obtained using all indices and RE-computed indices(R² of 0.76 and a RMSE-CV of 1.88 t ha^?1). Overall, the findings of this work have demontrated the potential and importance of strategically positioned bands, such as the red-edge band in the optimal estimation of indigeonus forest biomass. These results underscores the need to shift towards embracing sensors with unique and strategeically positioned bands, such as the forthcoming Sentinel 2 MSI and HysPIRI which have a global footprint.     

组合动力锚水动力特性数值模拟研究

作为海上浮式结构物的一种新型锚固基础,动力锚具有自安装、不受水深影响、适用范围广的特点。在动力锚的基础上研发的组合动力锚结合了动力锚自安装和板锚法向受荷的特点,具有安装快速、适用多种类型海床、承载效率高等性质。组合动力锚在水中自由下落时的水动力学特性（下落速度、方向稳定性等）会受到锚链、尾翼宽度和助推器质量等因素影响。若下落速度过小或方向稳定性过差,则会影响锚的安装成功率。采用计算流体动力学方法模拟流体对锚的冲击和锚在水中自由下落过程,以优化组合动力锚的尾翼尺寸;其次研究锚链作用力和助推器质量对组合动力锚下落速度和偏角的影响规律。计算结果表明：组合动力锚的拖曳阻力系数为0.45左右,尾翼宽度最优尺寸为翼板宽度的1.25倍。连接在锚眼处的锚链会减小组合动力锚的下落速度并加剧锚的偏转,需综合锚的下落速度和偏角来确定锚在水中下落高度。     

新型动力安装锚水动力学特性模型试验研究

相比于已有动力锚(鱼雷锚、多向受荷锚等),新型轻质动力安装锚借助助推器安装,具有质量轻、埋深大、承载效率高、在海床中下潜容易等特点。良好的水动力学特性(较小的拖曳阻力系数及稳定的下落垂直度)是确保动力安装锚准确、有效地安装到指定地点并贯入到设计深度的前提。通过4组10个工况的模型试验,研究了轻质动力安装锚的终端速度和拖曳阻力系数,及轻质动力安装锚和助推器的组合锚在水中自由下落时的方向稳定性。试验结果表明:优化后轻质动力安装锚的拖曳阻力系数为0.51~0.55,这有助于提高组合锚在水中的下落速度,从而提升组合锚的沉贯深度;增大助推器尾翼展弦比和选用轻质材料制作尾翼能减小组合锚的下落偏角,提高组合锚的方向稳定性。     

玻璃钢渔船船体骨架结构形式的研究

通过对玻璃钢渔船的五种船体骨架结构形式的弯曲试验,测得其力学性能。并且运用加权因素法对试验结果进行优化。研究结果表明按断面形状,梯形优于矩形;按断面结构,木质芯材优于泡沫芯材,泡沫芯材优于空心结构。     

河西走廊连通器效应探讨

分析讨论了河西走廊连通器的虹吸、连通以及狭管三个效应,并分别给出了其表达式。结果表明,河西走廊连通器的虹吸效应主要是传输各种物质和能量,连通器效应是产生垂直运动、激发重力波和产生翘翘板现象,而狭管效应主要是增强风速。文中还提出了在天气气候诊断分析中的应用问题。     

The defence of Japan

These articles concern two countries with broadly similar diplomatic and military alignments but with defence policies which appear to be evolving in opposite directions. In the first article, Keith Speed MP, Parliamentary Under-secretary of State for the Royal Navy until May 1981, offers a critique of UK naval policy as outlined in the Defence White Paper of June 1981. In the second article, Kaiji Yamaguchi, a professor of international law and member of the Japanese Navy, analyses Japan's defence imperatives in the light of Soviet activity in North-east Asia and US pressure on the Japanese government to increase its defence budget. Both articles highlight the dilemma posed by Soviet expansionism requiring a positive response from the West and a world recession which demands reductions in public spending.     

64层螺旋CT血管造影在头颈部血管病变中的临床应用

目的:探讨64层CTA在头颈部血管中的诊断价值.方法:收集头颈部血管CTA 200例,采用最大密度投影MIP、容积再现VRT、多平面重组MPR及Inspace软件中的减影技术进行三维重建,多角度观察,其中92例有豫、DSA及手术资料,采用双盲法,比较各种影像效果,总结出64层CTA的优缺点.结果:64层CTA用药少、辐射剂量小、扫描及成像速度快,图像清晰、立体感强并可任意方向旋转观察.VRT和MIP是最常用的方法,Inspace软件的减影技术能显示头颈部血管的全貌.结论:64层CTA可作为头颈部血管病变的常规筛选方法,可以普及使用.     

空间后方交会在航天相机检定中的应用

论述了利用空间后方交会方法对航天相机的内方位元素及星地相机主光轴间夹角进行在轨动态检定算法及其可行性，并通过实验验证了其算法的正确性。