基于主成分分析法对乳制品营养成分分析

乳制品与人们的日常生活息息相关,乳制品的价格各不相同,不同的价格背后所反映出的是营养成分的不同,为了探讨营养成分对乳制品价格的影响,本文在对乳制品进行调查统计的基础上运用主成分分析对乳制品的特征进行提取,实现了主成分分析用于乳制品营养成分定量分析的建模方法.结果表明:乳制品的营养成分特征性指标主要为蛋白质、碳水化合物、脂肪、钠、钙、能量组成;能量和钙则是这些营养成分里面对价格的影响较大的因子.此结论基本上是合理的,对于消费者选购合适的乳制品具有一定的指导作用,可以帮助消费者更为理想地消费乳制品.     

集优债务融资破解中小企业融资难的对策探讨

区域集优债务融资具有"短、频、快"的特点,能够很好地满足中小企业融资的需求。积极发展区域集优债务融资业务,对促进新疆中小企业发展,加快跨越式发展的进程,具有不可忽视的重要作用。为此,应高度重视区域集优债务融资模式的重要性,积极遵循其特点。努力构建各方面齐心协力推进的机制,共同用好区域集优直接融资这一有效措施。积极发展新疆的区域集优直接融资业务,推进社会融资规模合理增长,各发债主体、主承销商应与有关部门加强协作,大力实施"自治区重点企业债务融资余额增长计划",共同推进新疆直接融资业务健康发展。     

Accelerated matrix recovery via random projection based on inexact augmented Lagrange multiplier method

In this paper, a unified matrix recovery model was proposed for diverse corrupted matrices. Resulting from the separable structure of the proposed model, the convex optimization problem can be solved efficiently by adopting an inexact augmented Lagrange multiplier (IALM) method. Additionally, a random projection accelerated technique (IALM+RP) was adopted to improve the success rate. From the preliminary numerical comparisons, it was indicated that for the standard robust principal component analysis (PCA) problem, IALM+RP was at least two to six times faster than IALM with an insignificant reduction in accuracy; and for the outlier pursuit (OP) problem, IALM+RP was at least 6.9 times faster, even up to 8.3 times faster when the size of matrix was 2 000×2 000.     

主轴承孔采用加工中心加工的质量和效率研究分析

针对发动机缸体主轴承孔加工精度高,公差规定严的要求,加工中采用缸体底面及底面两定位销孔定位的方式,选择合适的加工方式和刀具在加工中心上进行加工,可有效保证其加工精度。     

美、英、澳三国中小学校长遴选制度述评

本文介绍了美、英、澳三国中小学校长遴选制度的发展状况及校长遴选的目的、原则和方法,并提出了对我国校长选用的借鉴.     

The relationship between behavioural integrity,competence, goodwill,trustworthiness, and motivating language of a principal

Utilising the oral language of a principal leading an inner-city at-risk elementary school in a large urban school district in the southwestern USA, the researchers tested behavioural integrity and the dimensions of source credibility (competence, goodwill, and trustworthiness) as antecedents to Motivating Language Theory and the ML Model. Teacher perception data at the Title I elementary school was used for this quantitative study. Over 95% of the teachers responded to a survey each year for a three-year period. Each year, there were statistically significant correlations between each of the antecedents and motivating language. The antecedents accounted for 66–75% of the total variance for motivating language depending on the year based on regression analysis. The results of this study extend the field of Motivating Language Theory and the ML Model, and further explain how the work of principals is accomplished.     

Muscle force characteristics of male and female collegiate cross-country runners during overground running

ABSTRACT

Males and females demonstrate unique running mechanics that may contribute to sex-related differences in common running related injuries. Understanding differences in muscle forces during running may inform intervention approaches, such as gait retraining addressing muscle force distribution. The purpose of this study was to compare muscle force characteristics and inter-trial variability between males and females during running. Twenty female and 14 male collegiate cross-country runners were examined. Three-dimensional kinetic and kinematic data were collected during overground running and used to estimate muscle forces via musculoskeletal modelling. Principle components analysis was used to capture the primary sources of variance from the muscle force waveforms. The magnitude of the forces for the hamstrings, gastrocnemius, and soleus muscles were higher across the majority of stance in male runners regardless of footstrike pattern. Males also demonstrated greater inter-trial variability in the timing of the peak gluteus maximus force and the magnitude of local peaks in the gastrocnemius force waveform. Male and female collegiate cross-country runners appear to employ unique lower extremity muscle force characteristics during overground running.     

H3(-1)中具有一个常主曲率的曲面

文章讨论H 3(-1)了中具有一个常主曲率的曲面,得到了另一主曲率与该常主曲率之间的关系。     

关于解析几何中二次曲线诸概念的图形表达初探

在课堂教学中，二次曲线诸概念因其抽象性不易被学生理解，然而一旦用几何图形配以相应的规律性概括，则立刻显得深入浅出，通俗易懂，本文就是关于这一问题的初步探索     

我国目前自杀的主要特点、社会心理分析与对策

从社会心理学的角度，探讨了自杀问题研究的意义、我国目前自杀的主要特点及社会心理分析，并就自杀的防范提出了宏观和微观的对策。