The Effect of Integrating Design Problems on Learning Mathematics in an Architecture College

A number of universities and colleges have developed mathematics courses based on the relationship between architecture and mathematics. Igor Verner and Sarah Maor report on a study of learning mathematics in professional context in one of the architecture colleges in Israel, with a focus on assessment and educational research. This paper considers in detail applied contents and learning activities in the course and our way forward in order to discuss them with the NEXUS community.     

喜马拉雅碰撞造山带和羌塘盆地的瑞雷波频散与三维速度结构

本文利用我国地震台站数字记录的瑞雷波资料，通过适配滤波频时分析技术和网格频散反演方法，求得了喜马拉雅碰撞造山带和羌塘盆地的瑞雷波频散和群速度的三维结构，再结合其它地球物理资料，研究了该区不同构造地带的地壳与上地幔结构，深层过程和三维模式、并探讨了青藏高原大陆物质运移的运动学过程和动力学机制。     

不完全Cholesky共轭梯度法及其在地电场计算中的应用

本文给出了解大型稀疏线性方程组的不完全Ｃｈｏｌｅｓｋｙ共轭梯度（ＩＣＣＧ）算法全过程，包括矩阵的高效一维压缩存储，系数矩阵的不完全因子化及最后的共轭梯度求解。该方法收敛快速，稳定，且内存要求相对小得多，通过点源二维地电场的有限差分计算实例，说明了ＩＣＣＧ方法较之直接方法有更大的潜在优势，是地电三维正演的强有力工具。     

"An examination of the relations among career subscales": Correction to Fuqua and Newman (1989).

Reports an error in "An examination of the relations among career subscales" by Dale R. Fuqua and Jody L. Newman (Journal of Counseling Psychology, 1989[Oct], Vol 36[4], 487-491). It was incorrectly reported that a principal-components analysis with varimax rotation was performed. In fact, principal-axis factoring with varimax rotation was performed, and it is the results of this analysis that are reported in Table 2 of the article. In principal-axis factoring communalities are used on the main diagonal of the correlation matrix. Initially, these communalities are equal to the squared multiple correlation of the variable with the other variables in the set. An iteration procedure is used to improve these initial estimates of communalities. Another point of clarification is that in the principal-axis factoring reported in Table 2, we used listwise deletion of missing data, whereas we calculated the correlations reported in Table 1 by using pairwise deletion of missing data. The effect of these different procedures is that the factor analysis (N = 98) was based on a slightly different correlation matrix that the one reported in Table 1, and consequently, Table 2 cannot be exactly reproduced by factoring the correlations reported in Table 1. Also, the sign of the correlation of the Career Decision Profile Choice-Work Importance (row 13) and Decidedness (column 7) subscales (.37) is given as positive in Table 1, whereas it was in fact negative. (The following abstract of the original article appeared in record 1990-03287-001.) We examined 13 career subscales contained in 4 measures of career indecision to determine how different measures relate to one another and how many dimensions may exist across these different instruments. Ss completed career instruments and measures of state and trait anxiety, which were included to aid in the interpretation of factors. Correlations provide some evidence of the convergent validity of the subscales. A factor analysis yielded a three-factor solution accounting for 55.9% of the variance. The first and most general factor was interpreted as a component that represented information about occupations and self. The second factor was interpreted as a more indecisive component and was positively correlated with anxiety. The third factor seemed to be an affective comfort component but failed to relate to anxiety as was expected. Theoretical and practical implications of these findings are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

机械图样尺寸的智能化识别与标注

尺寸的智能化识别与标注是克服尺寸信息重复的有效方法,文中阐述了尺寸信息与图形信息的密切关系,从而为实现精减尺寸输入信息获得充分根据。文中还提供了尺寸识别和标注的图形处理方法,现已用此法在计算机上初步实现。并提出这项工作还需改进的方面和展望。     

三维强化抛光振动台的理论建模与固有模态仿真研究

本文建立了具有五个自由度的三维振动强化抛光装置的动力学模型 ,基于MATLAB对此系统进行了数值仿真 ,确定了该系统的各阶固有频率和固有模态 ,并对固有模态进行了运动仿真 ,由此提供了振动台的结构参数 ,又为动态响应计算和分析打下基础。     

厚壁管件对接焊数字式传感自动跟踪控制器的研制

研制了一种全集成电路数字式传感双向自动跟踪控制器，该控制器可同时实现横向和纵向双向自动跟踪，跟踪精度高，抗干扰能力强，适用于Ｕ形和Ｖ形坡口的对接焊，且不受焊接方法和材料的限制。介绍了这种控制器的系统组成、工作原理、性能和使用考核结果     

用随机分形实现遥感影像的立体造型

随机分形是产生自然景物计算机图像合成的有效方法。将随机分形应用于三维地理信息图像造型中，产生反映地理高程信.色的自然图形，并进一步将图形与遥感图像结合，把传统的平面遥感图像构造成自然三维立休遥感图，产生直观的、有实用价值的立体图形.     

Chain dimensions of crystallizable polymers in the solid and melt states

Small angle neutron scattering (SANS) data were obtained on hydrogenated polybutadiene, a crystallizable polymer (α_c≈0.4), which is equivalent in chemical microstructure to polyethylene with ca. 18 ethyl groups per 1000 main chain carbon atoms. One linear sample (M=62 400) and one 3-arm star (M=104 400) were used; labelled species were prepared by deuteration of the parent polybutadienes. Scattering curves were obtained in both the solid state and the melt with mixtures containing up to 30% of the labelled species. The results indicated random mixing in the melt and the rapidly crystallized solid, and only a very slight amount of segregation in the slowly crystallized solid. The scattering curves conformed to predictions for random coil molecules over a wide range of scattering vectors. The radius of gyration obtained was the same in the solid and melt states, and in close agreement with θ solvent values for polyethylene.     

基于DGM和TDNN的火电行业NOx排放量变权组合预测

从区域火电行业NOx排放量预测问题的离散灰色、非线性和动态性等特征出发,建立了基于离散灰色预测模型(discrete grey model,DGM)和时延神经网络(time-delayed neural network,TDNN)模型的变权组合预测模型.其中,时延神经网络模型与传统静态神经网络(如BP、RBF神经网络)相比较,更能反映系统的动态特征,有利于提高预测的准确性;在组合变权系数确定上,采用了等维递补多项式拟合方法,提高组合预测的拟合精度.最后,以国家权威部门公布的1994-2009年火电行业相关历史数据为基础,对未来7年我国火电行业NOx排放量进行预测研究和分析.结果表明:从预测平均相对误差来看,变权组合预测为0.846％,而TDNN为1.296％,离散灰色预测则为3.472％,变权组合预测模型的预测精度明显高于单项预测模型;从预测结果趋势走向来看,组合预测结果与实际趋势最接近,较单项预测有更高的吻合度,预测结果准确可靠.