Based on the object oriented data structure of Voronoi diagram, the algorithm of the trimmed offset generating and the optimal too l path planning of the pocket machining for multiply connected polygonal domains are ...Based on the object oriented data structure of Voronoi diagram, the algorithm of the trimmed offset generating and the optimal too l path planning of the pocket machining for multiply connected polygonal domains are studied. The intersection state transition rule is improved in this algorithm. The intersection is between the trimmed offsets and Voronoi polygon. On this basis, the trimmed offset generating and the optimal tool path planning are mad e with three stacks(I stack, C stack and P stack)in different monotonous pouches of Voronoi diagram. At the same time, a merging method of Voronoi diagram an d offsets generating for multiply connected polygonal domains is also presented. The above algorithms have been implemented in NC machining successfully, and the efficiency is fully verified.展开更多
Based on studying the ontogenetic development of Calceola sandalina in the Early Devonian Yukiang Formation from Guangxi Zhuang Autonomous Region, South China, it is for the first time to issue the evidence indicating...Based on studying the ontogenetic development of Calceola sandalina in the Early Devonian Yukiang Formation from Guangxi Zhuang Autonomous Region, South China, it is for the first time to issue the evidence indicating the existence of sexual dimorphism in Calceola sandalina. The new discovery will add important data on sexual dimorphism throughout the non-colonial fossil metazoan, and it also may throw lights on studying the taxonomy and phylogeny of Calceola sandalina and its relevant taxa.展开更多
对某番茄酱生产企业提供的辐照杀菌（辐照剂量≥15 k Gy）的5 L无菌袋进行菌落计数、分离和鉴定。3 L无菌水反复漂洗,滤膜过滤后进行平板菌落计数,分离纯化后采用16S r DNA和dna J序列分析分别鉴定到属和种。结果表明,5批次的样品中均...对某番茄酱生产企业提供的辐照杀菌（辐照剂量≥15 k Gy）的5 L无菌袋进行菌落计数、分离和鉴定。3 L无菌水反复漂洗,滤膜过滤后进行平板菌落计数,分离纯化后采用16S r DNA和dna J序列分析分别鉴定到属和种。结果表明,5批次的样品中均有细菌检出,数量在5-132 CFU/袋,9个典型菌落经过16S rDNA序列分析后,分别属6个属,其中栖水菌属（Enhydrobacter）、不动杆菌属（Acinetobacter）和考克斯菌属（Kocuria）各1株,微球菌属（Micrococcus）、微杆菌属（Microbacterium）和芽孢杆菌属（Bacillus）各2株;dna J序列分析则将一株葡萄球菌C8-3鉴定到种-表皮葡萄球菌（Staphylococcus epidermidis）。辐照杀菌的无菌袋虽然微生物数量不高,但是依然残留了一些耐辐照的细菌,它们或多或少会给内装食品带来一定的食品安全隐患或影响食品保质期。展开更多
文摘Based on the object oriented data structure of Voronoi diagram, the algorithm of the trimmed offset generating and the optimal too l path planning of the pocket machining for multiply connected polygonal domains are studied. The intersection state transition rule is improved in this algorithm. The intersection is between the trimmed offsets and Voronoi polygon. On this basis, the trimmed offset generating and the optimal tool path planning are mad e with three stacks(I stack, C stack and P stack)in different monotonous pouches of Voronoi diagram. At the same time, a merging method of Voronoi diagram an d offsets generating for multiply connected polygonal domains is also presented. The above algorithms have been implemented in NC machining successfully, and the efficiency is fully verified.
基金Supported by the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (NIGPAS)
文摘Based on studying the ontogenetic development of Calceola sandalina in the Early Devonian Yukiang Formation from Guangxi Zhuang Autonomous Region, South China, it is for the first time to issue the evidence indicating the existence of sexual dimorphism in Calceola sandalina. The new discovery will add important data on sexual dimorphism throughout the non-colonial fossil metazoan, and it also may throw lights on studying the taxonomy and phylogeny of Calceola sandalina and its relevant taxa.
