BCK代数的极大元扩张

引进了 BCK代数的一种新的扩张方法——极大元扩张法 ,使得其他扩张法 ,如拟交错扩张法、有界 BCK代数的 Iseki扩张 ,都是极大元扩张法的特殊情况 .而且讨论了极大元扩张的其他性质 .     

区间上满的扩张Markov自映射的迭代根

考虑区间上满的扩张 Markov自映射 ,给出了区间上满的扩张 Markov自映射具有指定阶的迭代根的充分必要条件 .     

江浙沪建筑声学互访活动在南京举行

受江苏省声学学会和建筑学会邀请,上海市声学学会和浙江省声学学会代表团一行１０人于２００１年５月１５日－１７日在南京进行了访问和学术交流。在宁期间参观了江苏省设计院和南京大学近年来完工的紫金大剧院、江苏省艺术学院音乐厅和扬州大剧院等,举行了《剧场建筑与声学设计》学术报告会。上海现代设计集团章奎生声学研究所交流了他们近两年完成的２０余个文化建筑和体育建筑的声学设计,同济大学王季卿教授作了《古戏台建筑声学设计》学术报告,南京大学孙广荣教授、东南大学甄开源教授和柳孝图教授分别作了《音乐厅音质设计》、《檀…     

半素环的(1,σ)导子扩张

本文给出了半素环的自同构和（ １,σ）导子的扩张命题,这推广了［１］中的一些结论,然后借助半素环的广义中心里的幂等元在（１,σ）导子扩张模上建立起拓扑空间,从拓扑学角度给出（１,σ）导子扩张模的结构定理．     

关于Banach空间非扩张半群的强收敛定理

在Banach空间框架下,建立了几个关于非扩张半群显式迭代序列的强收敛定理．所得结果不仅推广和改进了Shioji-Takahashi,Suzuki,Xu以及Aleyner-Reich等人的相应结果,而且还部分肯定地回答了Suzuki和Xu提出的两个公开问题．     

Improved Denitrification of Municipal Sludge in Biofilm-electrode Reactor

The denitrification of municipal sludge was improved by combining biofilm process with the electro-chemical effect in a single novel reactor. Experiments in this reactorl-electric current 60 mA, hydraulic reten-tion time (HRTs) 6.0h] showed that the removal of CODcr, ammonia nitrogen and total nitrogen in the biofilm-electrode reactor were 2.5%, 1.2%, 14.9%, respectively, higher than those in a traditional biofilm reactor.     

Newtonian forms for the motion of particles and photons in dilaton spacetime

Using Newtonian forms for equations of motion, we consider the motion of particles and photons in the dilaton spacetime. Some classical gravitational effects, such as the bending of light rays, the perihelion advance of a planet, the delay of radar echo, and the gravitational redshifts, have been investigated. The results show that the gravitational effects arising from the dilaton can be observed provided that the dilaton is large enough.     

Three-dimensional simulation on explosions of hydrogen atomic clusters irradiated by an intense femtosecond laser pulse

Using classic particle dynamics simulations, the interaction process between an intense femtosecond laser pulse and icosahedral hydrogen atomic clusters H_{13}, H_{55} and H_{147} has been studied. It is revealed that with increasing number of atoms in the cluster, the kinetic energy of ions generated in the Coulomb explosion of the ionized hydrogen clusters increases. The expansion process of the clusters after laser irradiation has also been examined, showing that the expansion scale decreases with increasing cluster size.     

第6届欧洲地中海地区激光诱导裂析谱会议

本届会议于2011年9月11至15日在土耳其沿地中海东部城市Izmir cesme市召开。现就会议内容择要报道如下:就火星探测方面而言,在模拟<0℃的火星条件下用激光诱导裂析谱技术检测火星上冰、土壤与     

Local and long-range transport influences on PM2.5 at a cities-cluster in northern China,during summer 2008

Hourly PM2.5 concentrations were observed simultaneously at a cities-cluster comprising 10 cities/towns in Hebei province in China from July 1 to 31, 2008. Among the 10 cities/towns, Baoding showed the high- est average concentration level （161.57μg/m3） and Yanjiao exhibited the lowest （99.35 μg/m3 ）. These observed data were also studied using the joint potential source contribution function with 24-h and 72-h backward trajectories, to identify more clearly the local and countrywide-scale long-range transport sources. For the local sources, three important influential areas were found, whereas five important influential areas were defined for long-range transport sources. Spatial characteristics of PM2.5 were determined by multivariate statistical analyses. Soil dust, coal combustion, and vehicle emissions might be the potential contributors in these areas. The results of a hierarchical cluster analysis for back trajectory endpoints and PM2.s concentrations datasets show that the spatial characteristics of PM2.5 in the cities-cluster were influenced not only by local sources, but also by long-range transport sources. Different cities in the cities-cluster obtained different weighted contributions from local or long-range transport sources. Cangzhou, Shijiazhuang, and Baoding are near the source areas in the south of Hebei province, whereas Zhuozhou, Yangfang, Yanjiao, Xianghe, and Langfang are close to the sources areas near Beijing and Tianjin.