GIC4117 2×1.7MV串列加速器高能注入靶室的改进

通过更换丝杠和更新电机控制系统增大了靶盘纵向扫描范围,解决了扫描过程中纵向电机经常停转问题,并使靶室可装载10 cm(4 in)片子;通过隔离外界干扰电信号、精确控制扫描面积和对二次电子抑制电极的改进使注量测量误差达到了实验要求.     

外力J（t）作用下一维谐振子的传播子计算

用路径积方法计算了外力J(t)=f0t(f0为常量）作用下谐振子的传播子，并由此求得能量本征函数与本征值。     

铁路既有曲线整正测量方法

给出了全站仪任意点设站测量既有曲线上点的坐标的方法 ,对曲线整正中的半径选择 ,缓和曲线长度选配 ,拨距计算方法进行了探讨 ,讨论的方法及推导的公式可以直接应用于既有曲线整正作业     

Reproductive Biology and Prospects for Conservation of Caldesia parnassifolia (Alismataceae)——A Threatened Monocot in China

Caldesia parnassifolia (Bassi ex Linn.) Parl. in China has declined in number in recent years and is increasingly faced with the risk of extirpation arising from anthropogenic changes associated with rapid urbanization and expansion of both agriculture and infrastructure. To aid in provision of the data needed for effective conservation of the species, studies on the habitat, pollination ecology, and breeding system of C.parnassifolia were carried out on natural populations occurring in Southeastern China. Flowering in the study populations extended for more than eighty days beginning in early summer. Floral anthesis occurred in the morning hours and proceeded rapidly, lasting about 45 min. Flowers lasted ca.8h. Caldesia parnassifolia is self-compatible; however autogamy resulted in lower seed set than geitonogamy and xenogamy as well as free pollination. The data on pollen/ovule (P:O) ratio is consistent with a partially selfing and outcrossing mating system. Interpopulational crosses yielded similar seed set to within-population crosses. Agamospermy did not occur in the study populations. Propagation is achieved through seeds as well as through turions which commonly occur in the inflorescences. Flies (Insecta; Diptera) were the most frequent visitors to the flowers of C.parnassifolia; however bees (Insecta;Hymenoptera )composed a larger proportion of effective pollinators. The Syrphidae species Sphaerophoria indiana (Bigot) presents evidence of oligolectic foraging behavior. Recommendations are made on the immediate steps necessary for conservation of Caldesia species in China.     

高阶谱估计技术概述

近年来,对高阶谱(Higher-Order spectrum或Polyspectra)估计技术的研究得到新的发展,且高阶统计方法在许多领域中得到应用.本文对高阶谱估计技术的发展历史进行了简单的回顾,并着重介绍了双谱(Bispectrum)也称三阶谱(Third-Order Spectrum)估计方法的新进展.     

应用量本利分析原理进行物资经营预测

<正> 对于多品种的物资经营企业,往往因物资品种结构或销售价格结构变化较大,而影响企业盈亏预测的准确程度。如何消除或缩小这种影响,本文介绍应用量本利分析原理进行物资经营预测。一、绘制物资经营利润图绘制物资经营利润图首先要把物资总成本分解为变动成本和固定成本。变动成本随销售收入或其他经营能力利用度的变动而增减,包括物资销售原价、营业税、摊销的进货费用、保管费、物资损耗、利息、管理费、其他(旅差费、广告费、水电费)等。固定成本则与经营能力利用度无关,其发生额固定不变,包括仓储费、管理费中所剩的其他成本、工资、职工福利费、工会经费、折旧费、租凭费、修理费、低值易耗品摊销、劳动保护费、办公费、保险费、房产     

关于各向异性介质中热传导方程表达式的商榷

指出和论证某已发表论中热传导方程的表达式有误，并给出正确的表达式。     

利于计算曲线点串的差分算法

结合Bézier的幂基形式,介绍了一种计算曲线点串的差分算法,并对该算法和其它同类方法做了比较分析,说明差分算法确实是一种提高计算速度的有效方法.