关于职业教育发展的动力机制

不合理社会结构的存在引发的问题表现在以下几个方面：（1）“金字塔”型的社会分层是不合理的社会结构的主要表现;（2）社会分层是导致教育不公平的因素之一：（3）社会分层在某种程度上忽略了对底层的关怀。职业教育的出现意味着学校体系的分化．不同类型和阶段的学校教育．有着迥然不同的培养目标和职业前景．     

应用于海底地层钻探机器人的自推进钻头设计及自推进效果对比分析（英文）

目的：海底地层钻探机器人作为一种新型的海底地层地质调查手段具有广阔的应用前景。本文旨在分析并设计一种新型的自推进式螺旋钻头,以减小机器人在地层中运动时的前端阻力。创新点：1.通过理论建模分析,推导出新型自推进螺旋钻头的螺旋升角与土壤钻屑排出运动的关系;2.建立仿真模型,成功模拟钻头在海底土壤中的钻进过程,并通过其贯入力和扭矩分析其自推进效果;3.设计试验装置,成功模拟钻头在土壤中的钻进过程,并通过其贯入力和扭矩进一步验证其自推进效果。方法：1.通过理论推导,构建螺旋叶片升角与土壤钻屑排出运动之间的关系,得到具有设计优势的新型自推进钻头。2.通过Abaqus有限元仿真软件,采用耦合欧拉-拉格朗日方法进行钻头钻进过程的仿真分析,可视化观察钻头钻进过程对周围土壤的扰动范围（图9）;对比自推进钻头与传统锥形钻头在相同转速下轴向贯入力上的差别,确定其自推进效果的优势（图10）。3.通过试验,进一步验证所设计的自推进钻头在配制的模拟海底土壤中的减阻钻进效果（图14）。结论：1.自推进钻头钻进过程对周围土壤的影响范围小于传统锥形钻头;2.自推进钻头能够靠排出土屑提供推进力,因而有着更小的钻进阻力;3...     

扰动波频率■与波数K的关系

分层流是指受到铅直方向密度变化的影响而主要沿水平方向运动的流体、海洋、大气运动都属于这一类、这类流体在地球问题中很重要,文献[1]中讨论了分层流中扰动波的波速随波数k的增大而减小.本文讨论分层流中主要是二维振幅波扰动波频率■与波数k的关系.     

高等职业学校实施英语分层教学的问题探究

现阶段,高等职业学校实施英语分层教学存在以下问题：（1）对分层教学模式不清,简单地把分层教学理解为教学环节的分层。（2）分层教学脱离学校大环境独立进行。（3）高等职业学校英语教师的自身素质制约分层教学的有效开展。能否处理好这些问题,关系到高职院校英语学科分层教学探索的成功与否。     

水化硅酸钙应力松弛特性的分子动力学研究（英文）

目的：水化硅酸钙（C-S-H）是波特兰水泥的主要水化产物,是影响水泥基材料粘弹性机制的主要成分之一。然而,人们还未能在原子层面上完全理解水泥基材料在外加变形作用下随时间变化的粘弹性响应。本文旨在通过建立不同钙硅比的C-S-H模型,以分子动力学模拟的方式系统研究不同因素对水化硅酸钙应力松弛性能的影响。创新点：1.基于分子动力学模拟,获得C-S-H的应力松弛特性;2.研究应变状态、钙硅比和内部水含量对C-S-H应力松弛的影响,揭示其在应力松弛过程中所涉及的内部结构及能量变化。方法：1.通过各原子基团的均方位移在应力松弛过程中考虑C-S-H层间区域的粘度变化;2.基于时间相关函数,在不同应变状态、钙硅比以及温度的条件下研究C-S-H层间区域涉及到的化学键断裂与重组;3.阐明氢键网络和C-S-H形态对不同含水量下C-S-H应力松弛特性演变的影响。结论：1.在不同的初始变形条件下,C-S-H应力松弛响应均会发生,并显示出非均质特征;2.钙硅比的增大以及温度的提高会导致水分子、羟基和层间钙原子的运动加快,从而引起C-S-H层间区域的粘度降低,进而导致C-S-H的初始应力及残余应力降低;3.由于水分...     

直布罗陀海峡密度流成因的力学分析

现行高中《地理》教材关于洋流的形成 ,有这样一段话 :“大气运动和近地面风带 ,是海洋水体运动的主要动力 .…各个海域因海水的温度、盐度不同 ,导致海水密度分布不均 ,引起海水的流动 ,叫做密度流 .如图3-1 0所示 (见本文图 1 ) ,受地中海地区气候的影响 ,地中海蒸发旺盛 ,周围又无大河流入 ,海水的盐度高 ,密度大 ,水面降低 .与地中海相邻的大西洋海水 ,盐度比地中海低 ,密度小 ,水面比地中海高 .于是 ,大西洋表层海水便经由直布罗陀海峡流入地中海 ,地中海底部海水由海峡底层流入大西洋 .…”图 1　直布罗陀海峡两侧海水盐度剖面及海水…     

从课堂观察角度分析初中数学教师课堂提问情况

通过课堂观察表中数据显示分析,中学数学课堂教学中存在：（1）提出问题的类型单一;（2）教师对学生课堂表现关注度不够;（3）教师在提问中缺乏策略意识等问题。主要对策有：（1）教师要认真学习数学专业知识。（2）教师要积极参与学科教学知识技能的交流与培训。（3）教师要关注分层问题的设计。（4）教师要给学生足够的思考时间。（5）教师要充分尊重有不同见解的学生,注重生成新的课堂资源。     

色噪声对分子马达定向流向的影响

推导了在乘性色噪声驱动下分子马达定态几率流的表达式。通过解析计算和数值模拟得到,加性白噪声不能驱动分子以达产生定向运动;在一维周期惯性锯齿势中,随着噪声强度的增加,定态几率流增大;随着噪声自关联时间参数的增加定态几率流反而减小。     

面向认知公差的精密冲压工艺适应性设计方法（英文）

目的:精密冲压工艺过程中环境变量的波动导致工件出现破裂和皱褶等缺陷。探讨精密冲压工艺过程中环境变量(工件材质、冲压速度、压力、模具间隙和温度变化等)对冲压质量的影响,研究适应性工艺设计方法,提高精密冲压工件的质量。创新点:1.通过马尔科夫模型方程,推导出环境变量与精密加工波动公差之间的关系;2.建立试验模型,成功模拟适应性冲压工艺过程。方法:1.通过实验分析,推导出冲压过程中的晶粒流动和强度变化对成型零件的尺寸公差波动产生较大的影响(图2和3);2.通过理论推导,构建环境变量与加工波动公差之间的关系,得到适应性的工艺参数调节方案(公式16);3.通过仿真模拟,运用适应性设计方法在精密冲压过程中对工艺参数进行适应性调节,验证所提方法的可行性和有效性(图5)。结论:1.精密冲压过程中工艺参数需要根据不同的环境变量进行调节;2.环境变量与加工波动公差之间存在映射关系,运用隐马尔科夫模型实现关联表征;3.运用适应性设计方法对精密冲压工艺参数进行调节,加工波动公差明显减小,工件质量得到提高。     

湿式三相高速磁阻电机搅拌损失的特性研究（英文）

目的：传统干式电机在高速工况下存在动密封磨损和油液泄露等问题。1.本文通过电机湿式化提出一种湿式三相高速磁阻电机泵的新结构以去除动密封。2.简化电机泵结构并提高集成度,以通过油液的循环流动改善电机散热问题。3.集中研究电机湿式化后所引起的搅拌损失问题,为后续湿式电机搅油阻力矩的减阻优化提供一种较好的计算方法。创新点：1.提出一种新型湿式三相高速磁阻电机泵,并通过O型密封圈来构成湿式耐高压结构,避免了高速工况下的动密封磨损、油液泄露和发热严重等问题;2.通过理论分析,推导出湿式电机搅油阻力矩的解析模型;3.基于计算流体力学（CFD）建立湿式电机搅油的仿真模型,并对其运行过程中所受到的阻力矩和内部流场状态进行分析;4.设计制造实验样机,搭建湿式电机搅油的实验台架,并测试不同转速和温度下的搅油阻力矩。方法：1.通过理论分析,建立湿式电机搅油阻力矩的解析模型（公式(26)）;2.通过仿真模拟,对电机运行过程中内部流场状态（图9和10）与其受到的流体阻力矩（图11和12）进行分析,验证解析模型的有效性（图13和14）;3.通过湿式电机搅油样机和实验台架（图15和16）测试不同转速和温度下的搅油阻...     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.