基于PLC的抽油机变频控制柜的研究

游梁式抽油机拖动系统一直存在几个主要问题:一是系统效率比较低;二是带有冲击的周期性交变载荷;三是能耗较大;四是半负荷或者轻负荷问题十分严重.针对上面游梁式抽油机拖动系统中存在的一系列问题,分析研究了抽油机的工作原理、负载特性,并对油田所采用的各种节能措施进行了比较,明确了各种节能措施的优缺点,在此基础上对抽油机电机变频调速控制系统的研究.     

籽粒苋病害调查与防治研究

通过1996 ～1998 年的系统调查与试验研究,查明江西籽粒苋病害19 种,其中真菌病害13种,细菌病害3 种,病毒病害2 种,线虫病害1 种;对以上病害的症状、病原物及发生情况进行了描述。根据籽粒苋病害发生态势,确定了主要防治对象并提出综合防治策略及措施。     

求解二元多项式最大公因式的结矩阵算法

应用结矩阵和结多项式的性质, 通过引入结最小多项式和标准结基解矩阵等概念, 探讨结矩阵、结多项式与求解二元多项式最大公因式的关系． 给出一种求解二元多项式最大公因式的新方法．     

一次突发性暴雨过程分析

通过分析１９９６年８月９日陕西暴雨过程的环流背景、影响系统、能量场、稳定度和地面中尺度系统特征及演变,揭示了突发性暴雨过程的物理机制和要素场特征     

谈谈自行车运动

用动量矩定理分析了自行车运动的动态稳定性,给出了自行车运动的稳定范围．     

调控pH值提高木聚糖酶活力的研究

通过控制产酶过程ｐＨ 值能有效提高里氏木霉木聚糖酶活力。结果表明,当控制产酶ｐＨ 为４ ．０ 时,有利于提高木聚糖酶活力,且此ｐＨ 对提高β－ 木糖苷酶活力的影响更大。ｐＨ 调控时间不宜过长,一般应以控制１ ～２ ｄ 后让其自由发展为宜。     

Cumulate complex xenoliths in the Early Mesozoic in eastern Inner Mongolia

Mafic xenoliths occur in Mesozoic diorites from nine localities in eastern Inner Mongolia from the Da Hinggan Mts. to Huabei craton. Their petrologic and geochemical features suggest that they are an intact suite of cumulate complex whose mineral assemblages contain typical patent mantle metasomatism minerals such as pargosite, phlogopite and apatite. Their REEs and trace element characteristics suggest a comagmatic relationship in these cumulates with different compositions. Isotopic dating of the xenoliths indicates that they are products of the mantle magmatic underplating in the Early Mesozoic (237–224 Ma), and they may provide direct evidence for the crust-mantle interaction and vertical accretion of continental crust under a background of the mantle upwelling in the Early Mesozoic in Huabei region.     

The Rb-Sr age and geological implication of alkaline syenitic complex from Liangtun-Kuangdonggou at Gaixian, eastern Liaoning Province

Liangtun-Kuangdonggou complex, 30 km southeast of Gaixian Town, Liaoning Province, is composed of aegirine-augite hornblende syenite, aegirine-augite syenite, hornblende syenite, pyroxene syenite and syeno-aegirinolite. Rb-Sr isotopic data to the complex are reported and used for discussion of chronology and geological implication. They show that the complex occurred in early Proterozoic and is a tectonic sign of extension setting. Moreover, the date indicates that the Liaohe Group, which is metamorphic wall rock of the complex, formed over 1 900 Ma ago.     

巢蜜蜂新型蜜源饲料糖液的研究

对巢蜜蜂饲料专用糖液的制备进行了研究,筛选出该糖液的最佳生产工艺条件。经检测糖液的重金属含量明显低于国家卫生标准     

阶调印花中新坐标色差评价方法研究

提出了一种用于原色染料网目阶调印花中的新坐标色差评价方法。建立了新坐标色差评价的数学模型, 并用实验进行了验证。该方法能准确计算色相差和彩度差, 从而保证了阶调印花质量。