3~k元域上的三次方程根的简况

Ｆ是一个３ｋ元域，ｘ３＋ａｘ２＋ｂｘ＋ｃ＝０是Ｆ上的三次方程。该文证明方程ｘ３＋ａｘ２＋ｂｘ＋ｃ＝０在Ｆ中有一根，或一根与二重根，或三个互异的根，或没有根。     

A Dynamic Forecasting System with Applications in Production Logistics

Production logistics involve the co-ordination of ac tivities such as production and materials control (PMC), inventory management, p roduct life cycle management, etc. Those activities demand for an accurate forec asting model. However, the conventional methods of making sell and buy decision based on human forecast or conventional moving average and exponential smoothing methods is no longer be sufficient to meet the future need. Furthermore, the un derlying statistics of the market information change ...     

一个算术函数的误差项估计

设ψ(n)是Dedekind函数,∑n≤x=nψ(n)=αx E(x),其中α是常数,E(x)是误差项.主要目的是利用经典的复积分理论及解析方法研究了E(x)的平方积分均值,得到了一个较为精确的估计式.     

L函数的一类二次均值公式

设整数ｎ≥３，定义二次均值 其中表示对模ｎ的所有偶特征求和．证明了下列公式： 其中 φ（ｎ）为Ｅｕｌｅｒ函数。     

瑞利噪声环境中水下目标辐射信号增强算法

提出了基于高阶累积量广义函数迭代的自适应滤波算法，证明了该算法的收敛性，给出了广义函数的几种具体表示式。用该算法对瑞利噪声环境中水下目标辐射信号谱增强进行了仿真研究。结果表明：该算法具有很强的抑制瑞利(白或色)噪声的能力。因此，该算法在提高水下探测系统对水下目标的检测能力方面有重要的应用价值。     

生长素对乔纳金苹果试管苗生根的影响

以三倍体苹果品种乔纳金试管苗顶部茎段为试材，将其接种于添加不同生长素及其组合的MS(基本培养基)中，研究IAA、IBA、NAA 3种生长素对苹果试管苗生根的不同效应。结果表明：3种生长素均可诱导乔纳金试管苗生根，且组合处理的效应普遍优于单种激素，其中以MS IBA 0．8mg／L IAA 0．7mg／L为最好，其生根率达92％。     

Researching on quadrature conversion structures For an UWB demonstrative receiver

1. INTRODUCTION As the development of technologies of digital signal processing and integrated circuits, the structure of wireless communication system has been improved. Many schemes for software defined radio (SDR) systems have been developed since 1995, and they can be divided into five tiers of solutions according to their developing history and their definitions[1]. The five tiers are conventional hardware-implemented scheme; software-controlled radio scheme; SDR, that implements m…     

PEAK COVARIANCE STABILITY OF A RANDOM RICCATI EQUATION ARISING FROM KALMAN FILTERING WITH OBSERVATION LOSSES

We consider the stability of a random Riccati equation with a Markovian binary jump coefficient. More specifically, we are concerned with the boundedness of the solution of a random Riccati difference equation arising from Kalman filtering with measurement losses. A sufficient condition for the peak covariance stability is obtained which has a simpler form and is shown to be less conservative in some cases than a very recent result in existing literature. Furthermore, we show that a known sufficient condition is also necessary when the observability index equals one.     

原始地应力及力学参数的测定

本文根据孔壁应力解除法获得的量测应变,提出了采用最优化方法直接确定岩体的泊松比和原始地应力。实例表明,这样获得的原始地应力更符合实际——对应最小的量测残差。