船舶参-强横摇动力学系统的调和解分岔与次调和解分岔

应用平面周期系统的Poincaré映射、Poincaré定理以及m阶次调和解和Melnikov函数,系统地论证了船舶参-强激励非线性横摇动力学系统存在调和解和次调和解。     

SAPH400汽车结构用热轧钢的研制

SAPH400汽车结构用热轧钢的生产采用喂Re丝对夹杂物进行变性处理,使SAPH400钢具有良好的冷成型性能。钢的金相组织为铁素体＋少量的珠光体,无明显的带状组织。SAPH400钢质纯净、组织均匀、晶粒适中,适于复杂冷冲压成型加工,具有优良的综合性能,能满足用户的需要,是一种比较理想的代替普碳钢用于制造车架的新型材料。     

Comparison of vibration rolling,nonvibration rolling,and static stretching as a warm-up exercise on flexibility,joint proprioception,muscle strength,and balance in young adults

Warm-up is an essential component for optimizing performance before an exercise session. This study investigated that the immediate effects of vibration rolling (VR), nonvibration rolling (NVR), and static stretching as a part of a warm-up regimen on the flexibility, knee joint proprioception, muscle strength, and dynamic balance of the lower extremity in young adults. Compared with the preintervention, VR induced the range of motion of knee flexion and extension significantly increased by 2.5% and 6%, respectively, and isokinetic peak torque and dynamic balance for muscle strength and dynamic balance increased by 33%–35% and 1.5%, respectively. In the three conditions, most outcomes between VR and NVR were comparable; however, the participants had a significantly higher knee joint reposition error after NVR than after VR, indicating that NVR would have a hampering knee joint proprioception effect. In particular, compared with static stretching, VR significantly increased the quadriceps muscle strength by 2-fold and dynamic balance by 1.8-fold. These findings suggest that athletic professionals may take VR into account for designing more efficient and effective preperformance routine to improve exercise performances. VR has high potential to translate into an on-field practical application.     

Academic integrity: a quantitative study of confidence and understanding in students at the start of their higher education

Establishing a positive, proactive approach to issues such as plagiarism requires that students are equipped with the skills and experience to act with integrity, and that educators are fully aware of the attitudes and ability of students, particularly when they start university. This project used a questionnaire-based methodology to probe the attitudes, ability and confidence of undergraduates newly enrolled at a university in the UK, with a focus on concepts relating to written assignments. New undergraduates were confident in their understanding of plagiarism, yet performed poorly on simple tests of referencing. Students were generally of the opinion that academic misconduct should be modestly penalised compared to the standard penalties imposed by the UK higher education sector. Positive correlations were found between confidence, performance and recommended penalties, suggesting that confident students did better on tests of simple tests of referencing, and recommended more severe penalties for transgressions of academic integrity. These correlations were supported by findings that new postgraduates were more confident than new undergraduates, recommended more severe penalties and performed better in the simple tests of referencing. Findings are discussed in the context of educational needs identified for students, educators and institutions.     

PRB技术处理铀水冶尾矿酸性渗滤水的可行性研究

使用消石灰与炼锗煤渣混合物作为PRB材料,进行原位处理铀水冶尾矿酸性渗滤水的可行性实验研究.研究显示了PRB材料中和酸性渗滤水的效果很好,单位立方厘米的比例分别为1∶3、1∶4、1∶6的消石灰与炼锗煤渣混合物可以中和pH值为2.94的渗滤水体积分别为2.23 L、1.66 L、1.34 L;并且对U的去除有明显的效果,pH大于6时,穿透水中金属U的浓度都小于0.1 mg/L;pH大于7时,则穿透水中金属U的浓度大部分小于0.05 mg/L;实验过程中混合物的渗透性只有1∶3的降低,其它二种却没有影响.利用消石灰与炼锗煤渣混合物中和铀水冶尾矿酸性渗出水是可行的.     

镀锡板冲压黑线机理分析

通过预拉伸模拟出阀门用镀锡板冲压后板面黑线缺陷,结合扫描电镜以及能谱分析、三维轮廓仪详细分析了黑线产生原因,结果表明:(1)冲压前镀锡板的表面状态对冲压后表面有着直接影响,冲压后板面轧制纹路会放大,粗大突出的纹路会造成宏观上视觉黑线。(2)黑线缺陷处为板面高点,根据复印关系,板面高点对应轧辊低点,轧辊表面质量直接影响镀锡板板面形貌。(3)通过优化轧辊表面来提升板面形貌,从而解决冲压黑线问题。     

‘If this was real … ’: researching student meaning making in a digital rolling role drama

ABSTRACT

This article explores the interplay of the ‘live’ experience of drama learning in the classroom and curated digital content on learner meaning making, collaborative creation and subjectivities. It examines a case study conducted in an inner-city secondary school in Sydney, Australia, as part of a larger innovative international collaborative drama exercise entitled ‘The Water Reckoning Project’ (http://www.water-reckoning.net) which focussed on sustainability education. Data collected and analysed included ethnographic observations, video documentation and digital curation of students’ creative work, focus groups, and pre- and post-surveys. Findings of this study reveal the importance of the aesthetically charged, embodied experience of drama as the key driver of learning when integrating drama with digital technologies. This unique project enabled students to critically and creatively engage with significant real and fictional contexts, as well as issues of local and global relevance.     

锻钢轧辊质量控制

本文从制造和使用两个方面对锻钢轧辊的质量控制进行了分析。指出为了保证锻钢轧辊的使用特性,在轧辊制造上应建立严格的质量控制体系,使用上应制定切实可行的轧辊修磨制度。提出了质量控制的要点。     

梯度铝合金压制板材的热轧变形研究

研究了Alsi/al梯度铝合金压制板材在热轧大塑性变形后的组织、成分和性能变化,特别是梯度过渡区的塑性变形特征。结果说明:在变形温度为757K下,压制态合金板材经过热轧的大塑性变形后仍然保持着良好的梯度分布特征。随着变形量的增加,热轧板材梯度过渡层的非均匀性有所减少,芯部显微硬度值有所增加。     

计算机控制系统在带钢热连轧中的应用

介绍了以区域控制器群结构为主体的分布式计算机控制系统及其设计原则 ,该系统在带钢热连轧生产中得到了应用