Almost all the oil and gas reservoirs developed in marine sedimentary strata of China have undergone processes of multi-phase reservoir formation and later modi
本文提出了二个新的种群增长方程,方程Ⅰ和方程Ⅱ.对Gause的草履虫实验数据的拟合结果表明,这二个方程与逻辑斯谛方程相比,可以有效地降低拟合的残差平方和.
本文论证了局势决策乃是随机优势原则下的Markowitz模型的一种特殊情况和局势决策所具有的优良性质,证实了局势决策的可行性,从而获得了一种简便易行的实用决策方法。
<正> 1、两个命题命题1.设有限状态马氐链的转移概率阵为(p_(ij))n×n,通过有限次交换不同的行和对应的列后变为(p_(i′j))n×n,若p′_(ii+1)>0,i=1,2,……,n-1;p_(n
The silver contents of organic matter in the host rocks of the Songxi shale-hosted Ag-Sb deposit of northeastern Guangdong, South China, have been directly dete
要实现由“师本教育”向“生本教育”的转变,即把“以老师的教为本”的教育转向“以学生的学为本”的教育,首先要尊重学生,营造民主平等的课堂环境,其次要课堂让权,激发学生的学习
The conservation of geological remains in China, especially in renowned sites with historical or cultural significance, has long been paid attention to. As the
Based on the natural and social conditions as well as hydrogeological characteristics of the Ryukyu limestone, a major aquifer in the Ryukyu Islands, a concepti
Fluorite mineralization occurs along fractures and cracks of Middle Eocene and Pliocene limestones and marls in the north and northeast of the P?hrenk region (?
从全国各病区筛选的19个代表菌株,在三套(中国,日本和IRRI)16个鉴别品种上进行测试,获得4个病情指标,即病斑长度,病组,日增速率和日增百分率,采用不同的的病情指标作方差分析,所得结果不完全一致