山地城市“城镇更新型”城市组团模式研究——以江西德兴市为例

在城市化快速发展过程中,山地城市的空间扩展因受用地条件的限制而难以满足发展的要求,外延式的空间发展模式面临转型．以江西省德兴市为例,在分析山地城市空间发展转型内在要求的基础上,借鉴山地城市组团结构的经验,首次提出了“城镇更新型”城市组团模式作为山地城市空间转型的发展策略,以实现城市内涵式、集约型的可持续发展．     

一种新型双染料敏化的非水溶性光致聚合物全息记录材料

介绍了一种新型双染料敏化的非水溶性光致聚合物材料的制备及应用前景.材料能同时对红光和蓝光敏感,用红光和蓝光分别对材料曝光,测得两者的最大衍射效率分别76%和81%,相应的最大折射率调制度分别为0.0025和0.0021,说明该材料具有超高密度全息存储的潜力,并为下一步发展全色记录材料打下了良好的基础.存储实验表明,再现图像清晰明亮,图像间无串扰,适合双波长复用全息存储.稳定性验证表明,全息图具有良好的稳定性和耐候性,因此该材料是一种比较理想的全息记录材料.     

一种新的非水溶性光致聚合物全息干版的溶剂

讨论了溶剂对非水溶性光致聚合物全息干版的质量及对其全息性能的影响,通过大量试验筛选出一种新的较佳的溶剂.该溶剂与成膜物、光敏剂、单体等成份匹配较好,适合刮涂法、挤压涂法和自然流平涂制干版.涂出的干版厚度均匀、平滑、颜色均匀、膜干时间合适及保存期长;拍摄的反射全息图清晰明亮.     

现代铸造系统的集成框架研究

为了进一步提高铸造企业竞争力,需要对铸造过程中的设备、工艺技术等组合即现代铸造系统进行一体化研究。在分析了现代铸造系统体系结构基础上,提出了一种现代铸造系统的集成运行框架。给出了现代铸造系统的体系结构,介绍了该体系结构中的工艺技术、铸造设备、辅助软件、管理方法、人员和信息5个组成部分,并分析了现代铸造系统的层次性、复杂性、高效性及协调性特点。阐述了集成框架的用户层、信息软件层、设备层、网络层及数据库层的具体任务和组成。     

Nd isotopic variations and its implications in the recent sediments from the northern South China Sea

The chondrite-normalized REE distribution patterns in recent sediments from the northern South China Sea and surrounding areas are similar, with the HREE values being almost equal to or slightly higher, and the La_N/Lu_N ratio being lower, than PAAS standards. However, samples from the Xijiang River, a major branch of the Pearl River system, show opposite trends, i.e., with slightly lower HREE values and higher La_N/Lu_N ratio than PAAS. The distribution of Nd isotopes in sediments from the northern South China Sea was controlled by the Pearl River and the inshore area of South China, respectively. The volume of ε_Nd(0) from inshore areas of southern China is apparently higher than that from the Pearl River, and ε_Nd(0) values in offshore sediments and Taiwan Island are between these values. The results clearly show that ε_Nd(0) volume in the northeastern South China Sea is higher than in the southwest part of the northern South China Sea, indicating different source rock types. The main source rock of the Pearl River sediment is carbonate types and affects sediment deposition in the southwest of the northern South China Sea, while the source rock in the inshore area of southern China, mainly Mesozoic and Cenozoic granites, contributes to sediments in the northeastern area of the northern South China Sea. Due to different source rock types, the HREE values and the volume of ε_Nd(0) in recent sediments supplied by the inshore area of southern China are higher than those from the Pearl River. Over 80% of the rapidly accumulated sediments on the northern slope of the South China Sea in the southeast of Dongsha Islands area were derived from Taiwan Island and from inshore areas of South China, with only less than 20% from the Pearl River. Supported by National Natural Science Foundation of China (Grant Nos. 40276019, 40238060 and 40621063), and National Basic Research Program of China (Grant No. 2007CB819501)     

半刚性基层抗冲刷性能分析

文章分析半刚性基层的裂缝产生原因,大多数并非承栽力不足引起,而是抗冲刷能力不足导致使用寿命缩短,进一步通过冲刷试验来分析基层抗冲刷性能特点,同时得出从冲刷试验到数据处理方面相关建议.     

作文课中的乐趣

教学中,教师应通过各种途径和方法,激发学生写作兴趣,从而提高写作水平,体会写作乐趣.     

最大刚度下单孔静压圆盘止推气体轴承的参数优化

根据已知承载力求最大静刚度的设计准则,采用不可压缩流简化方法,推导出显含圆盘止推轴承结构参数的等效刚度计算式.图解法分析结果表明,轴承的最大刚度点位于设计平面内稳定性约束条件和供气孔直径约束条件的交点;数值优化计算的结果与图解法一致,计算方法可行.     

山葡萄五味果汁中成分及总能量的测定

根据国标及相关文献对山葡萄五味果汁中的总糖含量、蛋白含量、维生素含量及总能量分别进行了测定,明确了山葡萄五味果汁的营养成分,分别测出其糖的含量为7.16g/100mL,蛋白的含量为0.00g／100mL维生素C的含量为8.08mg/100mL,维生素B1的含量为0.31mg/100mL,并计算出每100mL饮品的能量为150.48KJ/100mL.为消费者了解该果汁饮品的成分提供了科学的参考.