对5~15年树龄广西马尾松在相同蒸煮工艺、相同打浆工艺条件下进行制浆性能与造纸性能的研究。结果表明:12年生马尾松的蒸煮细浆得率最高,其次为10年生;几种树龄的马尾松本色浆的平均纤维长度均在1.9 m m以上,长宽比均高于59;10年生马尾...对5~15年树龄广西马尾松在相同蒸煮工艺、相同打浆工艺条件下进行制浆性能与造纸性能的研究。结果表明:12年生马尾松的蒸煮细浆得率最高,其次为10年生;几种树龄的马尾松本色浆的平均纤维长度均在1.9 m m以上,长宽比均高于59;10年生马尾松浆的手抄片具有较高的抗张指数和耐破指数,且优于某公司以进口松木为原料生产的本色松木浆。这表明10年树龄的广西马尾松可用于制浆且具有较好的制浆性能。展开更多
Structures behave multi-directionally when subjected to earthquake excitation. Thus, it is essential to evaluate the effect of multidirectional loading on the dynamic response and seismic performance of reinforced con...Structures behave multi-directionally when subjected to earthquake excitation. Thus, it is essential to evaluate the effect of multidirectional loading on the dynamic response and seismic performance of reinforced concrete bridge columns in order to develop more advanced and reliable design procedures. To investigate such effects, a 1/4 scaled circular reinforced concrete bridge column specimen was tested under two horizontal and one vertical components of a strong motion that has long duration with several strong pulses. Damage progress of reinforced concrete columns subjected to strong excitation was evaluated from the test. The test results demonstrate that the lateral force response in the principal directions become smaller than computed flexural capacity due to the bilateral flexural loading effects, and that the lateral response is not significantly affected by the fluctuation of the axial force because the horizontal response and axial force barely reached the maximum simultaneously due to difference of the predominant natural periods between the vertical and the horizontal directions. Accuracy of fiber analyses is discussed using the test results.展开更多
通过对复合材料及其先进制造技术进行分析,结合铺放工艺性,提出基于三角网格的复合材料丝束可铺放性分析技术。在现有丝束基准路径和等距路径规划方法中融入分析机制,并系统分析丝束中心线转弯半径和角度偏差等指标。通过分析结果建立...通过对复合材料及其先进制造技术进行分析,结合铺放工艺性,提出基于三角网格的复合材料丝束可铺放性分析技术。在现有丝束基准路径和等距路径规划方法中融入分析机制,并系统分析丝束中心线转弯半径和角度偏差等指标。通过分析结果建立分区机制,将原铺层面进行区域划分,并独立进行丝束几何规划,提高制品质量。结合CATIA二次开发工具CAA在Microsoft Visual Studio 2005平台上实现丝束几何生成与分析功能,并对分析结果与分区结果的正确性进行验证。此研究为复合材料先进制造技术的发展提供了重要思路。展开更多
文摘对5~15年树龄广西马尾松在相同蒸煮工艺、相同打浆工艺条件下进行制浆性能与造纸性能的研究。结果表明:12年生马尾松的蒸煮细浆得率最高,其次为10年生;几种树龄的马尾松本色浆的平均纤维长度均在1.9 m m以上,长宽比均高于59;10年生马尾松浆的手抄片具有较高的抗张指数和耐破指数,且优于某公司以进口松木为原料生产的本色松木浆。这表明10年树龄的广西马尾松可用于制浆且具有较好的制浆性能。
基金NEES/E-Defense Collaboration ResearchProjects for Bridges of the National Research Institute forEarth Science and Disaster Prevention (NIED), Japan.
文摘Structures behave multi-directionally when subjected to earthquake excitation. Thus, it is essential to evaluate the effect of multidirectional loading on the dynamic response and seismic performance of reinforced concrete bridge columns in order to develop more advanced and reliable design procedures. To investigate such effects, a 1/4 scaled circular reinforced concrete bridge column specimen was tested under two horizontal and one vertical components of a strong motion that has long duration with several strong pulses. Damage progress of reinforced concrete columns subjected to strong excitation was evaluated from the test. The test results demonstrate that the lateral force response in the principal directions become smaller than computed flexural capacity due to the bilateral flexural loading effects, and that the lateral response is not significantly affected by the fluctuation of the axial force because the horizontal response and axial force barely reached the maximum simultaneously due to difference of the predominant natural periods between the vertical and the horizontal directions. Accuracy of fiber analyses is discussed using the test results.
文摘通过对复合材料及其先进制造技术进行分析,结合铺放工艺性,提出基于三角网格的复合材料丝束可铺放性分析技术。在现有丝束基准路径和等距路径规划方法中融入分析机制,并系统分析丝束中心线转弯半径和角度偏差等指标。通过分析结果建立分区机制,将原铺层面进行区域划分,并独立进行丝束几何规划,提高制品质量。结合CATIA二次开发工具CAA在Microsoft Visual Studio 2005平台上实现丝束几何生成与分析功能,并对分析结果与分区结果的正确性进行验证。此研究为复合材料先进制造技术的发展提供了重要思路。
