Let p be an odd prime,and let k be a nonzero nature number.Suppose that nonabelian group G is a central extension as follows1→G’→G→ZpK×…×ZpK,where G’≌Zpk,andζG/G’is a,direct factor of G/G’.Then G is a central product of an extraspeci
清丰柳子戏作为一个古老的稀有剧种,经过几个世纪的风雨历程,既有清朝中叶的鼎盛,又有京都花部的发展,因为有党和政府的密切关怀,柳子戏在五六十年代创造了辉煌.清丰柳子戏表
利用喷雾干燥重构微米级TiB2-SiC喷涂团聚粉,借助等离子喷涂成功制备了TiB2-SiC复合涂层。结果表明,包覆结构可减缓SiC高温分解,获得TiB2、SiC主相共存的复合涂层。通过显微
In this article,we refine certain earlier existing bounds for Berezin number of operator matrices.We also prove some new Berezin number inequalities for general n×n operator matrices.Further,we establish several upper bounds for Berezin number and general
数学思想包含数学文化与数学思维,是经过长期的探究和实践积累、提炼和总结出来的.在数学教育中,培养学生的数学思想能够让学生更好地理解数学原理,掌握数学规律,从而提高学
In this paper, we determine some nontrivial secondary Adams differentials on the fourth line Ext4,? A (Z/p, Z/p) of the classical Adams spectral sequence. Speci
This paper is mainly about holomorphic mappings associated with conic regions which are closely connected with k-ST(α). We introduce new subclasses of starlike
为了分析和掌握影响苏州现代服务业集聚区发展的主要因素,构建了影响服务业集聚区发展的指标体系并作因子分析。为了得到相关指标的数据,对178家苏州工业园区现代服务业集聚
研究了硫酸钠对锂渣复合水泥流变性及水化性能的影响。结果表明:随着Na2SO4掺量增加,复合水泥浆体中AFt量增加,黏度和剪切应力升高。Na2SO4的掺入增加了复合水泥水化早期AFt
以PFI磨为打浆设备,优化烟梗酶促打浆酶预处理条件,分析酶处理对浆料不同筛分纤维特征的影响.结果表明,酶用量0.5%、pH7、50℃处理4 h对打浆最有利.相同打浆度下,酶处理组磨浆能耗降低了37.21%.酶处理后浆料纤维主要分布在R30~R100内,其中R50、R100、R200纤维平均长度较对照分别增加了14.06%、15.69%和4.42%,纤维宽度也有所增加.酶处理组R50组分含量不变,但R100和R200组分减少了46.15%和18.24%,R350组分有所增加,经酶处理的R50纤维扭结指数减小