Discussion on marine source rocks thermal evolvement patterns in the Tarim Basin and Sichuan Basin,west China

Taking marine source rocks of lower Paleozoic in the Tarim Basin and Paleozoic ones in the Sichuan Basin as examples, their sedimentation process could be classified into four styles: continuous subsidence with deep sedimentation in early stage, continuous subsidence with deep sedimentation in later stage, that deeply buried-uplift-shallowly buried, and that shallowly buried-uplift-deeply buried. Unlike that in East China, the marine source rocks evolvement patterns did not accord with sedimentation styles one by one in superimposed basins in west China. Taking local geothermal field into account, four types of source rock evolvement patterns were built: that evolved fast in early stage, evolved fast in middle stage, evolved continuously and evolved in multistage. Among them, the 1st pattern contributed little to the present industrial oil pools directly, but paleo-oil reservoirs and gases cracked from crude oils were main exploration targets. Although some gases were found in the 2nd pattern, the scale was not big enough. For the 3rd and 4th patterns, the hydrocarbon potential depended on organic matters maturity in early stage. For relatively low mature rocks, it was possible to generate some oils in later stage; otherwise the main products were gases. Paleo-oil reservoirs remained fairly well in the Sichuan Basin, and most source rocks underwent kerogen-oil-gas processes, which was useful reference to gas exploration in the Tarim Basin.     

有界随机噪声激励下非线性系统的安全盆分叉

研究了带有平方项的非线性系统在确定性周期外力和有界随机噪声激励下,系统安全盆的侵蚀现象,并提出了随机安全盆分叉的概念。计算表明,由于随机扰动的影响,系统的随机安全盆分叉点发生了偏移。而增加系统的阻尼,减小系统的非线性强度,可以增大系统的安全盆区域。     

文化传统与都市经验——上海文化研究之反思

目前上海文化研究在史料的整理和史实的梳理上取得了不小的成就,可是由城市研究激发的深入犀利的理论思考则乏善可陈.绝大多数研究著作只不过使用不同的材料,来证明"现代化"叙事的正确和"发展主义"意识形态的不可抗拒.从"文化传统"和"都市经验"的角度来反思上海文化研究的现状,希望能在充分发掘上海经验的同时,提供另一种回应中国现代性问题的方式.     

与A反可换矩阵空间的维数

给定复数域上n阶矩阵A,所有与A反可交换的矩阵集合构成Mn(C)的子空间,称为与A反可换矩阵空间.研究了该空间的维数问题,分别给出了矩阵A相似于对角形和Jordan标准形时,计算与A反可换矩阵空间维数的公式.     

跌落水流时台阶式溢洪道消力池跃前断面压力修正系数

台阶式溢洪道与平底消力池连接,在跌落水流流况下,比较跃前断面压力修正系λ=1和λ>1两种情况,当λ=1时消能率普遍偏大,其消能率的相对误差最大可达7%左右,随Hdam/yc增大,误差减小。当坝坡相同、坝高一定时,台阶个数与消能率无关,并不影响其误差的大小。λ值与yp/y1呈现非常好的线性相关性,其相关系数r=0.9999以上。     

小窗口蚁群算法解决旅行商问题的应用与分析

本文先介绍基本蚁群算法模型,并应用此法对TSP(旅行商问题)进行了求解。然后运用小窗口蚁群算法解决TSP问题,通过与基本蚁群算法的比较,认为小窗口蚁群算法无论是在解的优化上还是运行时间上都优基本蚁群算法。     

广义华南弧

在华南弧的范围内,除了山系呈弧形分布外,水系、盆地、海岸线也是弧形的,作者对此称之为广义华南弧.     

Fm′3m′磁空间群不可约共表示的计算

介绍了求磁空间群共表示的一种方法，以及Fm′3m′磁空间群的结构，并用此方法对Fm′3m′磁空间群第一布里渊区中X点的共表示进行了计算．     

浅论20世纪80年代的户籍制度改革

新时期的农村改革使农村出现了大批剩余劳动力,为了避免这些农村人口涌进城市,国家出台了允许农民自理口粮到集镇落户的政策.虽然这个政策的实质并不是为了改革传统的户籍迁移制度,但是它首次触动了这个"禁区",开启了农民走出农村的大门.     

误差四边形及其解算

为防止小次数观测中出现大误差的小概率事件,本文对点位误差分布进行了探讨,井论证了前方交会点位误差的分布范围为四边形,提出“误差四边形”一词。分析了在同等条件下,用误差四边形解决问题比用误差椭圆等方法更客观,合理。最后提出其简易解算方法。