基于等标污染负荷法的工业废水污染源分析与评价——以绵阳市为例

对2013年绵阳市工业废水污染源及其污染物的年排放量进行了调查,并采用等标污染负荷法对其进行评价,分析了绵阳市的水污染特征.结果表明,绵阳市的主要工业污染物为COD、氨氮和石油类,主要工业废水污染源有24家企业,黑色金属铸造业废水污染源排列首位.该研究结果可为绵阳市的水环境保护及污染源总量控制提供科学、合理的依据.     

圆管分层两相流问题的解析方法

管道输运工程中经常遇到两相流问题,因此需要预测对流体施加的压力大小以指导运输。拟对圆直管道分层两相流-层流模型做研究,用解析方法计算出圆管任一截面处流体的速度分布,并验证两层流体交界面处的摩擦力与其平均速度差值呈近似线性关系的结论。以此为基础,可以通过计算截面速度分布得到流体与管壁的摩擦力,通过输运流体所需达到的速度得到分界面处摩擦力,最终反推出运输流体所需要施加的压力差大小。     

随机变系数线性结构关系EV模型的参数估计

利用随机加权正交回归最小二乘法给出了随机变系数线性结构关系EV模型中的参数估计。     

浅谈高等数学与工程数学的区别与联系

本文通过概述高等数学和工程数学的相关内容,阐述了二者在实际应用中的重要性,并通过简单的例子来说明二者的区别与联系,进一步证明了二者存在的意义。     

Indoor air quality risk assessment on the Canadian campus by a multilevel integrated weighted average method

Increasing incidents of indoor air quality (IAQ) related complaints lead us to the fact that IAQ has become a significant occupational health and environmental issue. However, how to effectively evaluate IAQ under different scale of multiple indicators is still a challenge. The traditional single-indicator method is subjected to uncertainties in assessing IAQ due to different subjectivity on good or bad quality and scalar differences of data set. In this study, a multilevel integrated weighted average IAQ method including initial walking through assessment (IWA) and two-layers weighted average method are developed and applied to evaluate IAQ of the laboratory building at the University of Regina in Canada. Some important chemical parameters related to IAQ in terms of volatile organic compounds (VOCs), methanol (HCHO), carbon dioxide (CO2), and carbon monoxide (CO) are evaluated based on 5 months continuous monitoring data. The new integrated assessment result can not only indicates the risk of an individual parameter, but also able to quantify the overall IAQ risk on the sampling site. Finally, some recommendations based on the result are proposed to address sustainable IAQ practices in the sampling area.     

Calculating method of contact stress for non-circular gears

According to Hertz theory, the difference of contact stress for non-circular gears and equivalent gears is compared in the paper, a calculating method of contact stress for non-circular gears by using equivalent gears is researched, and computing formulas of power and rotation speed for equivalent gears are deduced. A numerical simulation of contact stress for non-circular gears has also been conducted based on the finite element method. By the comparison of fitting curves, the feasibility of using equivalent gears instead of non-circular gears to calculate the contact stress is testified.     

构建高职院校特色文化育人模式

适应时代发展,高职院校应积极彰显精神文化,提升学生职业素养、人文素养、科学素养,彰显制度文化,培养学生工作文化风范,营造职企文化融通氛围,彰显课程文化、实践文化、校园文化,立体多元,构建具有鲜明企业文化特色的高职育人模式。     

军校融合型心理健康教育的路径与方法探究--以《思想道德修养与法律基础》课程为视角

融合型心理健康教育课程是指在学校常规教育教学活动中,形成融合型心理健康教育课程,在实践中注重挖掘课程中的内在心理健康教育资源,并引入心理健康教育的方法和技术,帮助学生完善心理机能的一种课程形式。将心理健康教育融入军校《思想道德修养云法律基础》课程教学,要遵循“以问题为牵引”“以心理学知识为媒介”“以实践性教学为载体”的教学路径,并采取团体心理辅导、课堂情景体验、项目化培训等多种方法,不断加强学员的心理品质。     

基于MATLAB的无约束优化问题对称秩-1法与BFGS法之探讨

对称秩-1法和BFGS法是用拟牛顿法求解无约束优化问题时最常见的两种方法,它们都具有计算简单、收敛速度快等优点.探讨两种方法的算法格式、收敛速度和计算精度问题,同时利用MATLAB软件编程进行实例求解.结果表明:在解的迭代次数和精确度方面,BFGS算法均明显优于对称秩-1法.     

CDIO构思环节在软件工程课程教学中的应用

学生由于缺少大型软件项目的开发经验,在学习软件工程课程时感觉比较抽象和枯燥,而且较难理解和应用相关知识.针对该问题,在课程教学过程中引入CDIO的教学理念,通过构思环节来引导学生主动思考,提升学生的学习兴趣,提高人才培养质量.