基于多尺度高斯核的分布式正则化回归学习算法

针对工业、信息等领域出现的基于较大规模、非平稳变化复杂数据的回归问题,已有算法在计算成本及拟合效果方面无法同时满足要求.因此,文中提出基于多尺度高斯核的分布式正则化回归学习算法.算法中的假设空间为多个具有不同尺度的高斯核生成的再生核Hilbert空间的和空间.考虑到整个数据集划分的不同互斥子集波动程度不同,建立不同组合系数核函数逼近模型.利用最小二乘正则化方法同时独立求解各逼近模型.最后,通过对所得的各个局部估计子加权合成得到整体逼近模型.在2个模拟数据集和4个真实数据集上的实验表明,文中算法既能保证较优的拟合性能,又能降低运行时间.     

秦皇岛市人民公园规划设计

以一个典型的设计实例为载体，介绍了设计师在公园设计中，将公园与城市街区空间相融合；景观设计凹刻城市地域特征和文脉等层面的思考。     

体现科技特色,创造共生环境--潍坊国家高新技术产业开发区中心广场规划(中标方案)

高新技术开发区是一种新的产业空间。论述了潍坊国家高新技术产业开发区中心广场规划的构思过程。着重探讨了如何在高新区既创造高科技特色，又能体现人与环境的共生的创作思路和理念。     

Fatigue crack growth analysis of a square hollow section T-joint

Stress concentration sites are always found at the brace and chord intersection corners of any rectangular welded tubular joint. As a result, fatigue cracks are liable to be initiated and propagated from these corners. In this paper, the 3D fatigue crack growth under the weld toe of a square hollow section welded T-joint is simulated using boundary element method. In accordance with the 3D analyses, fatigue crack growth is predicted using a model based on the Paris’ law and stress intensity factors. Good agreement between the experimental and predicted crack growth and crack shape development is obtained. Based on this crack growth analysis, the fatigue life of a specimen is predicted and compared with the standard S-N curve for hollow section joints. It is found that the standard S-N curve is safe and slightly conservative.     

方钢管混凝土柱与钢梁连接节点滞回性能的简化计算模型

本文从钢管混凝土梁柱节点的梁、柱及节点区域的变形及其弯矩———转角恢复力模型与出发,建立了分析梁端荷载———位移滞回曲线与弯矩———转角滞回曲线的简化计算模型,利用Matlab编制相应的计算程序,计算结果吻合于实测结果。此类简化分析有助于组合结构节点设计与工程应用。     

时报广场的兴衰

纽约时报广场的都市更新历时10多年，几经周折，现在终于基本完成，今日的时报广场恢复了昔日的辉煌，又注入了时代的勃勃生机，再次成为都市交响乐中一个最高潮 的乐章。本文简要回溯了时报广场近几十年里兴衰的历史背景，以及失败的都市更新的尝试，郑重分析了被完成的都市更新计划中所采用的一些重要原则，参照建成现实，对比设计者的提案，希望能够从中得出在都市更新中，尤其是如何对待城市历史，如何融入时代精神方面，值得借鉴的点滴经验。     

浅议城市设计中经营城市理念的运用——以大雁塔北广场为例

研究在城市设计中运用经营城市理念后对设计工作产生的意义和影响.通过归纳分析城市设计和经营城市的相关概念,并结合评析大雁塔北广场的设计实例,阐述了经营城市思想在城市设计中的作用.最后得出了结论:现代城市设计运用经营城市理念,将会创造一个经济效益、社会效益、生态效益等效益最优化的人本主义城市.     

挖掘地域文脉层，塑造广场新景观——西湖文化广场环境景观方案设计

广场作为城市的公共交往空间,在古今中外各时期均有不同特点.当前我国的广场景观设计与建设应注意挖掘地域的文化特色,应综合考虑视觉信息传达与空间弹性使用两个层面的问题,只有这样才能塑造广场新景观,弘扬我国的广场文化.     

创造多维复合的城市广场空间——以义乌市鸡鸣山广场为例

义乌市鸡鸣山广场规划顺应地形，把鸡鸣山广场主体分成多个高度不一、尺度较小的分区广场，并通过小尺度空间的穿插与交融，形成与城市整体空间体系相匹配的大尺度空间，采用延山引水、营造绿色的生态环境空间、营造丰富的视觉效果等措施，把丘陵地貌的劣势变为优势。     

Nonlinear behavior of concrete-filled stainless steel stiffened slender tube columns

This paper investigates the nonlinear behavior of concrete-filled high strength stainless steel stiffened slender square and rectangular hollow section columns. The stiffened slender tubes had overall depth-to-plate thickness (D/t) ratios ranging 60–160. The concrete strengths covered normal and high-strength concrete. The investigation focused on short axially loaded columns. A nonlinear finite element (FE) model has been developed to study the behavior of the concrete-filled stiffened tube columns. A parametric study was conducted to investigate the effects of cross-section geometry and concrete strength on the behavior and strength of the columns. The results of the concrete-filled stiffened tube columns were compared with the results of the companion concrete-filled unstiffened tube columns. It is shown that the concrete-filled stiffened slender tube columns offer a considerable increase in the column strength and ductility than the concrete-filled unstiffened slender tube columns. The column strengths obtained from the FE analysis were compared with the design strengths calculated using the American specifications and Australian/New Zealand standards. A design equation was proposed for concrete-filled stainless steel stiffened slender tube columns. It is shown that the proposed modified equation provides more accurate design strengths compared to the American and Australian/New Zealand predictions.