云南省西花蓟马种群遗传多样性ISSR分析

本研究运用简单序列重复区间标记(ISSR)技术对云南省西花蓟马进行遗传多样性分析。结果表明:筛选的12条引物共扩增出93个条带,其中多态性条带比率达64.52%;引物的平均多态信息量(PIC)、标记指数(MI)分别为0.36、2.97,种群间遗传距离介于0.000——0.318之间,说明云南省西花蓟马的遗传多样性较丰富。UPGMA聚类分析和主坐标分析(PCOA)结果一致,云南省45个西花蓟马种群分为五大类,且相同气候带的西花蓟马种群大多聚为一类。     

棕榈蓟马在作物上的种群消长、田间分布和抽样技术研究

棕榈蓟马在栽培条件下,2月中旬-3月中旬平均增长速度最快,r为0．137;在反季节栽培的长豇豆上棕榈蓟马成、若虫分布为“聚集分布”。在每株10～100头密度时,取样技术应取85～48株样本。     

三种药剂对榕母管蓟马不同虫态的毒力测定

榕母管蓟马是一种榕树上的主要害虫,以成虫、若虫吸取植物组织内汁液危害。文章用浸叶法测定吡虫啉、艾绿士、毒死蜱三种药剂对榕母管蓟马不同虫态进行室内毒力测定。结果表明:各药剂对榕母管蓟马各龄虫态的防治效果依次为:毒死蜱>艾绿士>吡虫啉;毒死蜱二龄、三龄、成虫的致死中浓度(LC50)分别为0.019、0.063、0.142mg/L;单一药剂对榕母管蓟马不同虫态的室内毒力强弱依次为:二龄若虫>三龄若虫>成虫。     

特定曲线在普通铣床上的加工

介绍了在小薄壁圆柱套筒面上加工两段螺旋槽的新方法。根据待加工的螺旋槽的各种技术参数,设计了一种靠模加工机构,在普通立铣床上就可以实现螺旋槽的加工,既简单方便,又节省成本。着重介绍了这种机构中各个零件的结构特征、相对位置、装配关系、运动范围、动作顺序;待加工件的装夹方式;与这种机构相配的机点工装、刀具的相对位置和动作顺序。在加工类似的螺旋槽时,利用这种机构,就省去了利用电脑铣床加工时的大量辅助时间和昂贵的加工费用。     

让不同的人在数学上得到不同的发展

<正>倘若推敲一下《数学课程标准》(2011年版)中各种理念、措施在实际教学中的落实情况,毋庸讳言,有一句话是这些年来我们一直未能充分展开讨论并深入实施的,那就是让不同的人在数学上得到不同的发展。这一理念在提出之初就很令教师费解,因为在应试教育的字典里,是没有不同这一词条的。与之相反,这些年来人们所追求的恰恰是人人在数学上都能得到同样的高分。不信我们做个假设,一个班学生     

让不同的学生在数学上得到不同的发展

<正>数学是人们对客观世界定性把握和定量刻画、逐渐抽象概括、形成方法和理论,并进行广泛应用的过程。数学作为一种普遍适用的技术,有助于人们收集、整理、描述信息,建立数学模型,进而解决问题,直接为社会创造价值。     

混沌神经元时间序列研究及其在图像加密上的应用

通过不衰减自反馈项从而保持暂态混沌神经元的混沌搜索机制,产生了一类新的混沌动力系统。     

不同PFC策略在变频空调上的应用研究

对无源PFC和有源PFC电路在变频机KFR-26BP上进行相关测试,结果表明,有源PFC谐波电流比无源PFC小,在低电压时,整机性能方面有源PFC要优于无源PFC,而在小功率范围内,无源PFC较有源PFC有一定的成本优势。     

统计过程控制在大型生产线上的应用

针对汽车安全件物料初加工生产过程中,物料硬度质量监控存在的只关注结果而忽视过程的问题,应用统计过程控制(SPC)技术工具,分析物料硬度过程能力指数等过程稳定性内容.结果表明:物料硬度特性得到明显改善,过程稳定性得到很大提高,说明SPC技术工具对于监控、测量、识别、分析、判断、改善生产过程的质量特性波动和问题趋势,具有一定的实用价值,值得推广和应用.     

中国与东盟电机等产品在日本市场上的竞争力比较分析

文章采用2000-2008年的数据,应用修正的国际市场占有率和可比净出口指数两个指标分析比较了中国和东盟电机等产品在日本市场上的竞争力状况。结果显示:在整个研究期内,中国电机等产品在日本市场上的占有率和可比净出口指数均高于东盟同类产品,其竞争力较东盟强。但从世界贸易的范畴来看,中国电机等产品在日本市场上的竞争力还应从提高出口产品附加值等方面来提升。     

The effects of socioeconomic status on healthy life expectancy among different age groups of Japanese suburban elderly

This study aims to elucidate the effects of socio-economic status (SES), physical disability, comorbidity, and long-term care (LTC) on healthy life expectancy (HALE) among the suburban elderly in Japan. A questionnaire survey was conducted among all residents aged 65 years and older in a suburban area of Tokyo in 2001, with two follow-up studies being conducted in 2004 and 2007. In all, 7905 respondents were included for analysis. Data analysis was performed using survival analysis, factor analysis, and structural equation modeling. The results indicated that improvement in SES of the elderly is associated with an extended life expectancy of living with good health particularly with regard to enhancing daily living capabilities and preventing the need for LTC. Significant age disparities were found in the relationship between SES and HALE among the Japanese suburban elderly. Furthermore, increased age and declining physical health within the high SES category appeared to override the significant effects of SES on HALE for the Japanese suburban elderly.     

The permeable university: Academic life in an age of special interests

Universities, like other institution, are both governed and managed. The processes of govermance within American universities have changed dramatically in recent years. To a significant degree, both the causes and the nature of the changes track changes in the larger surrounding political environment. In the final analysis, the future success of universities rests on the ability of university presidents to play the kind of leadership role that the national policy requires of the President of the United States.     

关于F.Smarandache简单函数的均值

主要利用解析的方法研究了函数d（p（n））的均值性质,并给出了它的两个有趣的渐近公式.     

国人不同年龄组和不同性别胫骨前肌的肌纤维型分布

研究了三个年龄组及不同性别胫骨前肌肌纤维型的分布,结果表明胫骨前肌浅部Ⅰ型肌纤维三个年龄组的分布比例平均为69.4%,深部Ⅰ型肌纤维三个年龄组的分布比例平均为70%.三个年龄组间进行显著性差异t检验的结果表明各年龄组间的肌纤维型分布统计学上无显著性差异(t检验t＜t0.05),但仍可见随年龄增加Ⅰ型肌纤维比例增加的趋势.男女性Ⅰ型肌纤维的分布比例平均为70%,经t检验表明不同性别间Ⅰ型肌纤维的分布在统计学上无差异(t检验t=0＜t0.05).     

模糊控制分区方法研究

针对基本模糊控制解析式控制粗糙的问题,介绍了一种比较适用的模糊控制表(F.C表)分区方法,并在模糊控制解析式中引入动态调整因子,仿真取得了满意的控制效果。     

The impacts of different types of workload allocation models on academic satisfaction and working life

Increasing demands on academic work have resulted in many academics working long hours and expressing dissatisfaction with their working life. These concerns have led to a number of faculties and universities adopting workload allocation models to improve satisfaction and better manage workloads. This paper reports on a study which examined the workload models in use across a large Australian university. Analysis revealed that the various models could be categorised into three types. The pros, cons and impacts of these three categories of model were compared from both a management and staff perspective. The study found that while models of all types can lay the foundation for equitable distribution of workload, some categories of model can have unintended consequences with negative effects on the work culture and hence staff satisfaction.     

The Audio-Visual Department of N.O.F.

A broadening of vision in the educational field led, in 1966, to the establishment of the N.O.F., the Dutch Foundation for Educational Films, with special responsibility for the production and distribution of tape-recordings and records for educational use.