共查询到19条相似文献，搜索用时 281 毫秒
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石剑锋 《南通职业大学学报》2013,(3):90-93
喷油器垫片分选关系到喷油器产品的品质,传统垫片分选需大量工人进行人工分选,属于劳动密集型工作,为降低工人的劳动强度,设计了4040A型喷油器垫片分选控制系统。分选机采用PLC作为主控系统,通过伺服电机控制模拟压力,在运动过程中测量喷油体组件和后顶针组件的长度,再经计算选出合适的垫片;同时介绍了垫片分选机的工作过程、实现方法等。运行结果表明,该控制系统能实现自动测量、自动选取垫片的功能,达到预期效果。 相似文献
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曾其科 《河北能源职业技术学院学报》2021,21(1)
金属垫片被广泛地用于高温、高压、强腐蚀介质的法兰联接中,是压力容器和管道中常见的密封形式。本文建立了螺栓-法兰-垫片联接系统模型,分析了预紧状态和工作状态平面金属垫片的应力应变。结果显示,垫片高应力区域出现在外圆周部分,圆周外沿首先发生塑性变形;介质压力作用加剧了垫片塑形变形,对垫片轴向变形量影响较大。 相似文献
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分析我国设计标准给出的垫片最小宽度N_(min)计算公式的局限性,提出N_(min)的确定应参考实际的使用经验,综合考虑材料的强度、垫片比压和面积等因素。 相似文献
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为了提高垫片零件的加工效率,本设计采用多工位级进模加工.本文介绍了该零件的级进模的工艺分析、模具结构、工作过程以及关键零件的设计. 相似文献
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通过构造Sierpinski垫片含含有多整数参数的覆盖序列，利用Sierpinski垫片的自相似性以及相关参数为序数指标，得到Sierpinski垫片的Hausdorff测度的较好上界；并以此为基础构造凸集进行覆盖，得到了更好的上界估计。 相似文献
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给出了Sierpinski垫片的Hausdorff测度上方估值的一个算法,用计算机实现后,得到了Sierpinski垫片的Hausdorff测度的较好的估值。 相似文献
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环氧树脂改性沥青混合料性能试验研究 总被引：2，自引：0，他引：2
为了解我国自主研制的环氧树脂改性沥青混合料的路用性能,采用马歇尔、劈裂、车辙、小梁弯曲和复合梁疲劳等试验,对其材料特性和路用性能进行了全面的试验研究,并与SMA10混合料的性能进行了对比研究.车辙和复合梁疲劳试验结果表明,环氧树脂改性沥青混合料具有良好的高温稳定及疲劳性能;与SMA10混合料相比,环氧树脂改性沥青混合料具有良好的抗水损害及低温抗开裂性能.研究表明,新型国产环氧树脂改性沥青混合料以其优异的性能和良好的经济优势为我国大跨径钢桥桥面铺装提供了一种新的铺装材料. 相似文献
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转移阻抗法测试EMI衬垫屏蔽效能 总被引：4，自引：0，他引：4
文沛先 《武汉职业技术学院学报》2003,2(1):43-47
本文介绍了用屏蔽室测量法、模搅拌小室(MSC)方法、ASTM方法、直流电阻法和转移阻抗法测试EMI衬垫的屏蔽性能。并且根据穿透EMI衬垫的能量与衬垫的转移阻抗成反比的原理，着重探讨了用转移阻抗法进行屏蔽效能测试的原理、测试系统结构和计算方法。 相似文献
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AbstractResilience can be viewed as successful adaptation despite challenging or threatening circumstances (e.g. poverty). This article reports on an investigation of which the primary aim was to establish how additional educational support enhances adolescents’ resilience and academic performance. A quantitative approach was followed using two schools. One was a poverty-stricken school where additional educational support was officially offered, while the other school offered normal required tuition and was located in a middle class suburb. In total, 117 Grade 9 and 10 learners participated in the research. The results indicated that resilience related positively to academic performance and to other factors which are associated with academic performance such as teacher-learner relationships, parental involvement and study methods. Additional educational support to poverty-stricken learners resulted in higher resilience and academic achievement. Amongst the variables used in the investigation, additional educational support explained the largest proportion of the variance in academic achievement, followed by resilience and cognitive development. 相似文献
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张永兴 《重庆大学学报(英文版)》2003,2(2)
1. Introduction In October 2000, the Chongqing government received an exciting message. The Planning Committee of China approved the feasibility reports on Changshengqiao sanitary landfill projects supported by a loan from World Bank. This indicates that the Chinese government and local governments of different ranks have come to realize the importance of city environment and sanitation, and it also stands for the termination of simple and easy landfills. Before 2015, two modern sanitary l… 相似文献
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This paper presents a semi-analytical method to solve one dimensional consolidation problem by taking consideration of varied compressibility of soil under cyclic loading. In the method, soil stratum is divided equally into n layers while load and consolidation time are also divided into small parts and time intervals accordingly. The problem of one-dimensional consolidation of soil stratum under cyclic loading can then be dealt with at each time interval as one-dimensional linear consolidation of multi-layered soils under constant loading. The compression or rebounding of each soil layer can be judged by the effective stress of the layer. When the effective stress is larger than that in the last time interval, the soil layer is compressed, and when it is smaller, the soil layer rebounds. Thus, appropriate compressibility can be chosen and the consolidation of the layered system can be analyzed by the available analytical linear consolidation theory. Based on the semi-analytical method, a computer progra 相似文献
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针对学生计算机基础能力的差异和计算机基础课程模块化的特点,对计算机基础实验教学进行改革。采用模块化的分层教学方法,把实验的每个模块划分为三个层次,对不同层次的学生在实验课上实行分层培养。 相似文献
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程值军 《咸阳师范学院学报》2011,26(6)
研究经典分形集Sierpinski三角垫的Hausdo廿测度的上界估计,构造了Sierpinski5-垫的某种覆盖六边形,给出了这个覆盖集中小三角形的个数以及覆盖的直径的计算公式,据此获得了Sierpinski三角垫的Hausdorff测度的一个更好的上界估计值Hs（S）≤137781/109286×（2431/3072）s≈0.870 031 853. 相似文献
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林本 《福建教育学院学报》2010,11(2):47-51
文章以二手访谈资料为依据,探讨了如何从优势视角出发,对网络成瘾的青少年进行辅导。在研究中,我们将网络成瘾看作是成瘾青少年的一种非常规的抗逆力表现形式,认为抗逆力有三种构成因素：外部支持因素、内在保护因素以及效能因素。通过对案例的分析,我们可以看到抗逆力的三种构成要素在网络成瘾中得以建构的过程。 相似文献
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Resilience, defined as positive adaptation and functioning following exposure to significant adversity, is an important topic of investigation in child welfare. The current study used data from the Ontario Looking After Children (OnLAC) project to estimate the prevalence of behavioral resilience (i.e., lower frequency of conduct and emotional problems, higher frequency of prosocial behavior) in 531 5–9 year olds living in out-of-home care, and to determine how behaviorally-resilient children are functioning in other domains (i.e., peer relationships and academic performance). Furthermore, hierarchical linear modeling was used to examine the contribution of four levels of analysis (i.e., child, family, child welfare worker, and child welfare agency) on behaviors and to identify the contribution of predictor variables within each of these levels. Findings indicated that 50–70% of children exhibited resilience on one behavioral outcome while approximately 30% showed resilience on at least two of the outcomes. Also, 8.4–9.6% exhibited resilience on one of the behavioral outcomes in addition to peer relationships and academic performance. The child level accounted for the highest proportion of total explained variance in behavioral outcomes, followed by the family-, child welfare worker-, and child welfare agency-levels. A number of child and foster family variables predicted behavioral functioning. Findings indicate that it is important to inquire about children's functioning across multiple domains to obtain a comprehensive developmental assessment. Also, child and foster family characteristics appear to play considerable roles in the promotion of behavioral resilience. 相似文献