A spontaneous benomyl-resistant mutant ofPodospora anserina exhibiting a diurnal growth rhythm

Summary A spontaneous mutant ofP. anserina isolated by screening for benomyl resistance exhibited a diurnal growth rhythm dependent on light-dark cycles. The rhythmic character, the benomyl resistance and a growth rate reduced to 50% of that of the wild type were inherited together over more than 10 generations. The locus was mapped on linkage group II, 0.35 map units distal to the locusz (=0.81 map units from the centromere).     

International interdependence of business cycles in the manufacturing industry: The use of leading indicators for forecasting and analysis

This article introduces new leading indicators for fifteen industrialized countries which enable the business cycle in manufacturing to be forecast fairly reliably between 4 and 6 months ahead. These indicators are based on an improved variant of the NBER method, yielding a composite leading indicator characterized by less erratic movements and clear turning points. The indicators are used to explore the international interdependence of business cycles and to examine the degree to which this interdependence is affected by growing economic integration, as in the EC. For each of the countries studied, the various foreign economies affecting the local business climate are identified. Since the business cycles of some countries clearly lead those of others, this international interdependence can be used to further improve the predictive power of the leading indicators in the lagging countries.     

自动识别给定层段沉积旋回性质的新方法

应用马尔柯夫过程理论和计算机技术分析了地层岩性序列．提出一种根据转移概率矩阵和熵分析确定给定层段地层沉积旋回性质的新方法，通过对两口井九个井段资料的实际处理，证明该方法是可行的，计算机解释结果与手工解释结果完全吻合。     

有向图中弧数和回路

本文部分解决了Heydemann等提出的一个猜想。也就是证明了每一阶为n的强连通有向图D,如果最小半次至少为3,至少n~2-6n+21条弧,则D存在长至少n-1的回路。     

VERTEX-DISJOINT QUADRILATERALS IN BIPARTITE GRAPHS

H. Wang considered the minimum degrees condition that G has large vertex-disjoint cycles in bipartite graphs. Motivated by this, we consider the small vertex-disjoint cycles in bipartite graphs in this paper. We prove the following result: Let m > 3, n > 2 and k >1 be three integers. Let G = (V1,V2;E) be a bipartite graph with | V1| = | V2| =n > 2k 1. If the minimum degreefor any cycle C of G with length 2m, then G contains k vertex-disjoint cycles of length 4. Moreover, the degrees condition is sharp.     

冻融循环作用对土质边坡稳定性的影响

为研究冻融循环作用对土质边坡稳定性的影响,利用强度折减法,通过大型有限元软件ABAQUS计算获得边坡的稳定安全系数,与简化Bishop法获得的理论安全系数进行比较,并以特征部位位移发生突变作为破坏判据,研究了坡度和冻融循环次数对边坡稳定性的影响。结果表明:采用有限元中边坡整体失稳的三种判据得到的安全系数相差不大,且与简化Bishop法得到的理论解误差很小;当坡度一定时,边坡的安全系数随冻融循环次数增加逐渐降低,并最终趋于稳定;当冻融循环次数一定时,边坡安全系数随坡角的减小而增大,即边坡越平缓,安全系数越大,边坡稳定性越好,可为边坡稳定性影响因素的探究提供参考。     

川西坳陷中-南段须家河组层序地层格架与生储盖组合

以地表露头、钻井岩芯、测井曲线和地震剖面的沉积相、基准面旋回与层序界面特征的综合分析为依据,将川西坳陷中-南段须家河组划分为2个超长期、4个长期和13个中期旋回层序.在此基础上,根据高分辨率层序地层旋回等时对比法则,运用二分时间单元分界线(层序界面和洪泛面)为优选时间-地层对比位置,以长期旋回层序为年代地层框架和中期旋回层序为等时地层对比单元,对川西坳陷须家河组进行了等时地层对比和建立高分辨率层序地层格架,并对地层格架中的沉积充填作用和生、储、盖组合特征进行了详细分析.     

一类具有常数存放率的三次kolmogorov系统的定性分析

对一类食饵种群具有常数存放率的三次kolmogorov系统:(dx)/(dt)=x(a0+a1x-a2x2-a3y-a4y2-a5xy)+k,(dy)/(dt)=y(bx2-d),进行定性分析,得到该系统不存在极限环和存在极限环的充分条件.