浅谈机械设备单机车核算及管理

文章谈了机械设备的完好率、利用率指标如何计算,单机车核算利润如何计算,并从施工管理的角度对如何提高单机车核算效益提出了几条建议,旨在为企业的机械设备单机车核算提供参考.     

Log-gamma函数在有理点的值和e~απ的超越性

Γ（x）:=integral fromn=0 to ∞(e^-tt^x-1dt),x>0为gamma函数。设f（x）:=logΓ（x）+logΓ（1-x）,x∈Q(0,12]。证明如果存在有理数y0∈Q(0,12],使得f（y0）=logΓ（y0）+logΓ（1-y0）∈Q,则集合{eαπ|α∈珚Q}中恰好有一个代数数,即e-f（y0）π,且e-f（y0）π=sinπy0。     

卡诺图在时序逻辑电路自启动教学中的应用

自启动是时序逻辑电路设计教学过程中必须考虑的问题,也是数字电路课程教学的重点和难点内容。本文详细介绍了电路不能自启动的原因,并举例说明在时序电路设计教学中,可基于次态卡诺图化简,预先设计好无效状态的次态,实现逻辑电路的自启动。结合卡诺图的方法,使学生更易于掌握时序逻辑电路的设计以及解决自启动问题。     

Diversity and life-history traits of wild bees (Insecta: Hymenoptera) in intensive agricultural landscapes in the Rolling Pampa,Argentina

The decline of bees is a major concern due to their vital role in pollinating many crops and wild plants. Some regions in South America, and especially the Pampas, are amongst those parts of the world where stressors of bee populations have been little studied. The Pampas has been intensively transformed for agriculture, being presently one of the most productive areas of agricultural commodities in the world. Here, we aim to provide first insights on the taxonomic and functional composition of bee assemblages in the Rolling Pampa, the most intensively managed part of the Pampas. Soybean (herbicide-tolerant genetically modified varieties) is the predominant crop in this region. Bees were sampled with coloured pan traps. Sampling points were located on field margins in either the cropped or the semi-natural grassland area of a farmland site devoted to annual cropping. A total of 2384 individuals were caught, representing 33 taxa [mainly (morpho)species]. The subgenus Lasioglossum (Dialictus) largely dominated captures (78% of the total abundance) and was relatively abundant in the entire study area, suggesting that some species are likely to reach their ecological requirements in cropped areas. No-till fields and field margins may provide large areas for these below-ground nesting species, while their polylectic food preferences allow them to collect pollen on a wide range of plant species, among them possibly soybean. On the contrary, the richness and the abundance of other taxa were higher in the semi-natural area than in the cropped area. Among them, above-ground nesting or oil-collecting species, which have more specialised nesting and floral requirements, were highly associated with the semi-natural area. Our findings highlight the large dominance of L. (Dialictus) species in this highly intensively managed landscape, and the urgent need of preserving semi-natural habitats to maintain species-rich and functionally diverse bee communities in the Pampas.     

分子生物学综合性实验创新教学改革与探索

综合性实验着重于学生综合运用知识与基本技能的培养,有利于培养学生独立分析与解决问题、科研思维和创新意识的能力。结合分子生物学实验课程实际情况,提出了传统教学存在的问题,改革与探讨了综合性实验的内容与要求、方案的设计、实验结果的评价、实验的指导与管理等方面。     

论《宠儿》的后现代叙事策略

美国当代黑人女作家托尼.莫里森在小说《宠儿》中使用了多角度叙事、碎片叙事模式等后现代主义创作手法,形成了自己独特的后现代叙事风格。通过分析小说中多角度叙事、碎片叙事模式、＂重现回忆＂（re-memory）,控诉奴隶制对美国黑人身心所造成的伤害和扭曲,揭示美国黑人昔日的悲惨境遇,呼唤黑人共同关注自己的未来。     

食品分析实验课程改革的几点思考

本文对食品分析实验课程改革进行了研究,明确食品分析课程实验教学的本质,结合食品分析的课程特点,设置增强学生实践能力的实验项目,创新教学的思路和手段,加强学生实践能力和安全操作意识的培养,为社会输送应用型人才。     

概率在产品寿命预测中的应用

对于产品寿命的状况，给出一种概率统计的新方法。     

“多角度、交叉式”教学改革的研究与实践

结合高等学校电类专业培养应用型人才的社会背景,提出采用多门课程联合、多角度参与式教学模式.使师生的交集最大化,增强学生的参与感和自主性,使教学更具针对性,同时使学生对所学课程的理解更具系统性,切实实现培养应用型人才的目标.     

傈僳族、普米族高中生基本颜色词的概念结构——兼与摩梭高中生基本颜色词概念结构比较

采用自由分类法考察傈僳族和普米族高中生对11种基本颜色词的分类,并同摩梭高中生比较。结果表明,傈僳族高中生基本颜色词的概念结构有两个维度:①彩色/非彩色;②亮色/暗色。11个基本颜色词被分为非彩色,暗杂色,花朵、水果色和背景色4类。普米族高中生基本颜色词的概念结构有两个维度:①彩色/非彩色;②单色/杂色。11个基本颜色词被分为非彩色、暗杂色、彩色及红粉色4类。傈僳族、普米族和摩梭人对11种基本颜色词的分类既有共性,也有差异,体现了遗传、环境、文化和教育对颜色认知的影响。研究还表明,地理环境通过生产方式影响人类的颜色认知。