关于Sauer引理的一个推广

Sauer引理是统计学习理论中的基本结论．在许多实际问题中，需要研究N类模式识别问题．本文将Sauer引理推广到N类分类问题．     

乙醇三维内微肋热管的传热性能

采用实验研究的方法对三维内微肋热管的强化传热特性进行研究，首次报道了以乙醇为工质的三维内微肋热管的传热性能。在实验范围内，与光管相比，竖直放置时，沸腾换热系数可以提高98％—190％，凝结换热系数可以提高76％—178％。三维内微肋结构能够同时明显地强化热管的沸腾换热与凝结换热，可以有效地减小热管的内热阻。     

Sequence of Plasmodium falciparum chromosomes 2, 10, 11 and 14

The mosquito-borne malaria parasite Plasmodium falciparum kills an estimated 0.7-2.7 million people every year, primarily children in sub-Saharan Africa. Without effective interventions, a variety of factors-including the spread of parasites resistant to antimalarial drugs and the increasing insecticide resistance of mosquitoes-may cause the number of malaria cases to double over the next two decades. To stimulate basic research and facilitate the development of new drugs and vaccines, the genome of Plasmodium falciparum clone 3D7 has been sequenced using a chromosome-by-chromosome shotgun strategy. We report here the nucleotide sequences of chromosomes 10, 11 and 14, and a re-analysis of the chromosome 2 sequence. These chromosomes represent about 35% of the 23-megabase P. falciparum genome.     

重介质旋流器分选机理研究

物料分选过程 ,是整个体系能量降低的过程 ,从这一原理出发 ,不同性质的固体颗粒在重介质旋流器中将位于不同的位置 ,使不同性质的固体颗粒得以分离。固体颗粒在重介质旋流器中的运动轨迹大体呈圆锥螺旋线形状 ,实测出的密度线验证了该结论     

Enhancements of energetic particles near the heliospheric termination shock

The spacecraft Voyager 1 is at a distance greater than 85 au from the Sun, in the vicinity of the termination shock that marks the abrupt slowing of the supersonic solar wind and the beginning of the extended and unexplored distant heliosphere. This shock is expected to accelerate 'anomalous cosmic rays', as well as to re-accelerate Galactic cosmic rays and low-energy particles from the inner Solar System. Here we report a significant increase in the numbers of energetic ions and electrons that persisted for seven months beginning in mid-2002. This increase differs from any previously observed in that there was a simultaneous increase in Galactic cosmic ray ions and electrons, anomalous cosmic rays and low-energy ions. The low-intensity level and spectral energy distribution of the anomalous cosmic rays, however, indicates that Voyager 1 still has not reached the termination shock. Rather, the observed increase is an expected precursor event. We argue that the radial anisotropy of the cosmic rays is expected to be small in the foreshock region, as is observed.