夸克与胶子碎裂动力学之间的一个定性差别

提出了一种基于研究喷注内部动力学起伏的区别夸克与胶子喷注性质的新方法。用蒙特—卡洛方法证明了横动量阶乘矩的标度性质在这两类喷注中非常不同。对于夸克喷注，随着分割数的增大而很快地趋于饱和；而对于胶子喷注。趋于饱和很慢，这样就得到了夸克与胶子碎裂动力学之间的一个定性差别。     

夸克喷注和胶子喷注内部动力学起伏的蒙特卡洛研究

用改进的角度法则从3-喷注事件中挑选出胶子喷注和夸克喷注，直接对这两种喷注中的动力学起伏的特性进行了蒙特卡洛研究，发现在Pt方向上夸克喷注内部的动力学起伏比胶子喷注内部的动力学起伏要强，从而给出了夸克和胶子在强子化碎裂过程中的动力学性质上的区别。     

舟山群岛异常气候长期变化与发展趋势的研究

根据舟山市气象台1954年和上海市中心气象台1873年以来的年降水、气温资料,通过波谱分析,定量研究分析了舟山群岛130年来的旱涝、冷暖气候年际分布和周期性演变过程,同时预测了今后10年的变化趋势.     

Seasonal cycles of abundance of the flora and fauna associated with Cladophora albida (Huds.) Kütz in rockpools

Seasonal data for one year on the flora and fauna associated with Cladophora albida (Huds.) Kütz from four rockpools (3 high-shore, 1 mid-shore) on Great Cumbrae Island, Firth of Clyde, Scotland are presented. A total of 131 858 animals was censussed. The mid-shore pool had a significantly lower annual mean density than the high-shore pools. Only at the most exposed site was a distinct seasonal trend apparent (lowest faunal density in spring, highest in summer). Species number showed no marked seasonal fluctuations neither did equitability. The lowest diversity was found in the mid-shore pool. Epiphytic cyanobacteria were present throughout the year. Diatoms were absent in the summer; possibly because of intense grazing by meiofaunal herbivores. The reduction in overall faunal density in the mid-shore pool was caused by the absence of large numbers of nematodes at this site related to the reduced availability of detritus and sand grains, perhaps reflecting greater wave scouring at this level on the shore. Large meiofaunal populations overwinter successfully in Cladophora in these ice-free latitudes and sheltered waters. Nematodes and harpacticoid copepods dominate the fauna of Cladophora in these permanent pools. Even populations in high-shore situations are remarkably stable. The rhombognathid mites, the polychaetes Fabricia sabella and Janua pagenstecheri and the chironomid larvae all showed little or no seasonal fluctuations in numbers, though most harpacticoid copepods, ostracods, turbellarians and archiannelids had very definite population maxima. Cladophora also acts as a nursery ground for species whose adults live elsewhere on rocky shores.     

滑动窗口MF-DFA方法在大坝变形监测中的运用

为了探索大坝变形与时间序列的相关性,通过引入滑动窗口技术对多重分形消除趋势波动法MF-DFA进行改进,与传统的MF-DFA计算结果进行比较分析.实例结果表明多重分形更能刻画大坝变形过程,滑动窗口MF-DFA法比传统MF-DFA法的精度更高,定标指数H(q)值更快趋于较稳定的值,同时从整体上描述变形数据序列的相关性,为后续预测提供依据.     

气压脉动仪及湍流大气中的气压脉动频谱特征研究

基于自制气压脉动仪在内蒙古科尔沁地区大气边界层与大气环境综合实验站2019年夏季的观测资料,计算气压脉动特征参数,分析气压频谱及气压标准差特征.结果表明,自制气压脉动仪能够反映气压的快速变化,频率响应接近1 Hz;气压脉动方差谱曲线在0.0006～0.5 Hz的频率范围内满足n?2标度率,峰值频率低于风速和温度;不同稳...     

江淮分水岭生态脆弱性特征及对策研究

江淮分水岭自然经济系统的波动性、人类不合理利用自然资源与生态脆弱性三者之间在空间分布和成因上均有密切的联系.本文分析了江淮分水岭生态脆弱性特征及其原因,并从克服农业生产的制约因素、维护农业生态系统稳定性角度提出江淮分水岭生态脆弱性消除对策.     

位相和振幅涨落对激光辐射的影响

用统计学原理研究了位相涨落和振幅涨落时对激光辐射的互相干函数和频谱密度的影响,得到了热辐射情况下导出的自相干函数和强度涨落相干函数间的关系式在激光辐射情况下不再适用的结论。     

Coupling controls of neotectonism and paleoclimate on the Quaternary sediments of the Yangtze （Changjiang） coast

1 Introduction The Quaternary sediments of the Yangtze coast, re-garding their distribution and origin, have been intensively discussed over the last decades since they are deeply in-volved into many aspects of Quaternary study, such as sea-level fluctuations, paleoclimate change and sediment facies evolution[1―6]. A painstaking effort has been made on the sediment study, which tends to elucidate what the primary control on sediment deposition and sedimentary facies formation is. Of note, nu…     

关于Hayman的两个问题

研究了亚纯函数的微分多项式f’f与f’—f~3的值分布问题,部分地解决了Hayman提出的两个著名问题。