"无言的教化者"与"会说话的建筑"--关于建筑的道德教育功能的思考

建筑所具有的文化性、伦理性和艺术性 ,使建筑在某种程度上具有道德教化的功能 ,虽然这种功能有时是抽象而隐性的 ,但它对人的品德形成的影响是不可忽视的。尤其是作为一种隐性德育课程的校园建筑 ,和一些能够营造出独特道德教育环境或氛围的特殊建筑 ,其道德教育的功能更为自觉和明显。     

Influence of TiO<Subscript>2</Subscript> on the alkali resistance and structure of invert glass

Through measuring the alkali resistance of the invert glass and the quanity of SiO₂ and TiO₂ migrating fron the glass into the solution, the influence of TiO₂ on the alkali resistance of the glass is discussed and its structure is also analyzed by infrared spectroscopy. It is concluded that TiO₂ has double functions for the alkali resistance of the invert glass. On the one hand, both TiO₂ polarizing the secondary ions in glass and TiO₂ isomorphism replacement of SiO₂ make the alkali resitance of the glass decrease. On the ther hand, TiO₂ patching network and anti-erosion covering help to increase the alkali resistance. ZHAO Qing-lin: Born in 1972 Funded by the National Natural Science Foundation of China(No. 59372081)     

一种新的相干信源DOA估计算法: 加权空间平滑协方差矩阵的Toeplitz矩阵拟合

文献[1]提出的最优加权空间平滑技术可以使相干源存在时的信源协方差矩阵恢复为对角阵.由于文献[1]中导出的最优权矩阵是空间信源方位的函数矩阵,本文利用最优加权空间平滑后阵列协方差矩阵的Toeplitz性,构造了一个全新的优化拟合的代价函数,并基于此提出了一种相干源方位估计的新算法.与文献[1]不同,算法的实现不需要方位估计的先验知识和协方差矩阵的去噪预处理.分辨性能的蒙特卡罗仿真实验表明,新算法对空间相干信源的分辨性能优于常规的空间平滑算法和最大似然算法,在小阵列和信源空间间隔较近时,算法的优越性尤为突出.     

印鉴识别相似度的计算框架

印鉴识别是计算机图像处理和模式识别技术的重要应用．基于模板匹配提出了一种印鉴识别相似度的算法框架，并应用于实际的印鉴识别过程．修正了经典相似度公式不能直接应用于实际的印鉴识别系统的问题，将差异像素点的特征信息加入到该算法中，使真假印鉴与预留印鉴匹配后的相似度结果很好地分布在阈值的两边．同时，为了使算法更加可靠和高效，引入多测度的相似度进行印鉴识别．实验结果表明，在不同层次的匹配级别上使用不同测度的相似度可以提高算法效率，而由多种相似测度综合而成的多测度相似度具有很强的区分性和鲁棒性．     

Ar+激光辐照下离体猪鼻咽组织的热响应特性

为了获得用于鼻咽癌(NPC)光活检的Ar^ 激光对鼻咽组织的安全光剂量阈值，实验测定了离体猪鼻咽组织在Ar^ 激光辐照下不同位置的温度分布，重点研究了辐照功率密度和波长对组织中温度分布的影响。实验结果表明，组织中的温度分布与探测位置、激光波长以及激光辐照功率密度有关。在同一波长激光辐射下，组织中的温度随着辐照激光功率密度的增大而增大，当辐照功率密度达到1．85W／cm^2时，鼻咽组织黏膜下层的温度可超过41．5℃；在相同功率密度激光的辐照下，波长为514．5nm的激光照射鼻咽组织时的光热效应较488nm波长明显。     

大线能量焊接耐火耐候建筑用钢的性能试验及应用研究

对武钢研制的大线能量焊接耐火耐候建筑用钢的力学性能、焊接性能与其典型应用进行了研究。试验结果表明：该钢具有优良的综合力学性能，在600℃温度下的屈服强度均高于其室温下屈服强度的2／3，完全满足建筑结构用钢耐火安全性的强度许用指标；该钢具有低的焊接冷裂纹敏感性，能承受大线能量(50～100kJ／cm)焊接；该钢在大型建筑应用中的实际效果良好。     

版面分析中表格与图形的鉴别

在版面分析过程中,有时会将表格误判为图形或将图形误判为表格。为避免对误判的表格或图形进行识别而产生的错误结果,文章提出了一种根据表格框线信息和表格单元信息来区分表格与图形的方法。该方法结合表格的结构特征,提出了作为一个表格的重要组成要素的表格框线和表格单元所必须满足的若干约束条件,通过验证每个条件是否得到满足来区分表格与图形。实验表明,该方法能有效地区分绝大多数表格与图形,极大地降低了对表格与图形的误判率。     

多自由度系统非线性参数识别的灵敏度方法

为了识别多自由度系统的非线性参数（3次阻尼系数、3次刚度系数和干摩擦力），提出一种基于灵敏度分析用测量响应（位移、速度或加速度）识别非线性参数的方法。将结构抽象为由线性和非线性阻尼、刚度连接的集中质量系统，用四阶Runge—Kutta法求解多自由度非线性系统的振动响应和振动响应对非线性参数的灵敏度。假定非线性参数为零初值，根据计算响应与测试响应的差值，由基于正则化的阻尼最小二乘法迭代识别系统的非线性参数值。算例表明，该方法可以有效地识别多自由度系统的非线性参数。     

Experimental study on the controlled air oxidation of sawdust in a packed-bed reactor

The controlled air oxidation technology is a promising way of disposing medical waste, which has been a huge challenge in China. It converts waste through partial oxidation into a gaseous mixture, small quantities of char and condensable compounds. But operational performance of the primary chamber of the controlled air incinerator is poorly understood, leading to difficulty in control. In this paper, a packed-bed reactor was established to study the effect of O₂ concentration on sawdust oxidation. The feed gas flow rate was kept constant at 0.6 m³/h at room temperature (26 °C) with O₂ concentrations varied from 6% to 12%. Temperature profiles of the beds, product yields and gas compositions in the out-of-bed fuel gas were measured in detail. The results showed that the sawdust beds achieved low temperatures for the given O₂ concentrations and leveled off in the oxidation processes. The bed temperatures increased and the solid yields decreased with the increase of O₂ concentrations. When the O₂ concentration was 10%, the gas yield reached a minimum and the liquid reached a maximum correspondingly. When the O₂ concentration increased from 6% to 10%, the peak concentrations of CO and CH₄ in the gas yield increased. However, when the O₂ concentration exceeded 10%, CO and CH₄ concentrations decreased. As O₂ concentration varied from 6% to 12%, CO₂ concentration increased continuously. This study provides a fundamental insight that the reaction processes could be well regulated by means of adjusting the feed air in practical units.     

Persistence energy transfer between inequivalent Eu2+ ions in CaAl2Si2O8:Eu2+

Persistence energy transfer between Eu²⁺ ions in CaAl₂Si₂O₈:Eu²⁺ has been observed, which mainly due to the complexity of the system, brought about by the different crystallographic sites.With the increase of Eu²⁺ concentration, a persistent down-converted afterglow from blue to green was observed due to efficient persistence energy transfer from Eu₁ to Eu₂ which located at inequivalent sites in CaAl₂Si₂O₈:0.19Eu²⁺. When some of the trapped carries are released from the traps (T₁) via thermal activation, they are returned to the excited state of Eu₁, and rapidly transfer their energy to Eu₂, which contribute to the observation of tunable persistent color.