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本文在对现行课程教学目标的价值取向进行分析的基础上,对素质教育背景下素质教育与认知教育的关系及素质教育背景下认知教育的特点进行了理性思考,然后就课程教学目标价值取向中应注意的问题提出了自己的看法。 相似文献
2.
材料科学与工程专业本科生生产实习的改革与实践 总被引：8，自引：0，他引：8
生产实习是大学教学过程中的重要实践环节。针对目前生产实习存在的问题,我们将以前在国有大型企业的定点实习改为在多个不同性质、不同规模、不同领域的企业进行。并根据课程学习的进展情况分成两个阶段,第一阶段以参观、调研为主;第二阶段以培养学生动手能力和综合解决实际问题的能力为主。经过三届本科生的试点,证明这种方法不仅使学生获得了极大的收获,而且加强了学校与企业间的联系。此外,还能缓解了生产实习经费不足的矛盾,具有一定的推广价值。 相似文献
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大材料专业“材料科学基础”课程的教改认识与实践 总被引：9，自引：0，他引：9
本文根据天津大学材料学院材料科学与工程专业教学改革的目标,讨论了相关《材料科学基础》课程教改中的一些热点问题及教改实践。“材料科学基础”是材料科学与工程专业较为基础和重要的课程,在公共基础课和专业课程之间起着一个必经的桥梁作用。材料学院在专业设置齐全、专业积淀较厚的背景下,利用学科门类齐全的优势,在加强基础、拓宽专业、注意理论体系的贯通融合、与专业课的衔接等方面进行了探索和三大材料专业知识结构的优化重组,初步建立了大材料专业“材料科学基础”课程的新教学体系,从中取得了一些较好的教改效果和经验。 相似文献
4.
“材料力学性能”课程的教学改革与实践 总被引：1，自引：0，他引：1
“材料力学性能”是材料科学与工程专业本科生的学科基础课程。针对“材料力学性能”课程的教学现状,并考虑到材料学科的发展趋势及高等教育改革的基本要求,我们本着调整教学体系、优化教学内容、知识教育与素质教育并重、基础知识与前沿知识并举、注重培养学生创新能力、多媒体与双语辅助教学等形式和原则,对课程进行了教学改革和实践。经过两届的教学实践证明,这种教学改革的尝试是基本成功的,学生的收效很大。 相似文献
5.
Thin plates of 21% Cr ferritic stainless steel welded by pulsed gas tungsten arc welding at different pulse frequencies were investigated for the microstructure characteristics and hardness behavior.The welds contained columnar grains in the outer part and fine equiaxed grains in the central region due to the pulsed process. 相似文献
6.
如何让专业课教学更贴近工程 总被引：2，自引：1，他引：2
如何在素质教育的背景下,利用现有的教育资源,让专业课教学更贴近工程实际,是摆在我们高等教育面前的重要任务。本文就此问题结合大学本科金属材料工程专业的专业课教学改革实际提出了多元化课堂教学模式结合开放性研究型综合课程实验教学的新思路。 相似文献
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The characteristics of microstructure, mechanical property and corrosion behavior of Cr26Mo3.5 super stainless steel joints by pulse tungsten inert gas(P-TIG)welding and laser welding were investigated. The results indicate that the widths of the center equiaxed grain zone(EGZ)and the columnar grain zone(CGZ)increase with the increase of heat input in both welding processes. The precipitates of Nb and Ti carbides and nitrides are formed in the weld metal(WM)and the heat affected zone(HAZ). The joints by laser welding show better tensile and corrosion resistance properties than those by P-TIG welding due to the heat concentration and lower heat input. The tensile strength and elongation increase with the decrease of heat input, and the fracture mode of the joints turns into ductile-brittle mixed fracture from ductile fracture when the welding method turns into P-TIG welding from laser welding. Moreover, the corrosion resistance of all joints declines slightly with the increase of heat input. Hence, laser welding is more suitable for welding Cr26Mo3.5 super stainless steel in engineering applications. 相似文献
8.
This paper introduces the complexity and particularity of tube-sphere intersection weld(J-groove weld) and establishes the mathematical model of tube-sphere intersection trajectory.Based on the characteristics of J-groove welds,the computational process of welding gun orientation is first simplified.Then the kinematic algorithm of a welding robot is obtained according to screw theory and exponential product formula.Finally,Solidworks and SimMechanics are employed to simulate the kinematics of the welding robot,which proves the feasibility of the kinematic algorithm. 相似文献
9.
The behaviors of YAG laser welding process of ferritic stainless steel with activating fluxes were investigatedin this study. Some conventional oxides, halides and carbonates were applied in laser welding. The resultsshowed that the effect of oxides on the penetration depth was more remarkable. Most activating fluxes improved thepenetration more effectively at low power than that at high power. The uniform design was adopted to arrange theformula of multicomponent activating fluxes, showing that the optimal formula can make the penetration depth up to2.23 times as large as that without flux, including 50% ZrO2, 12.09% CaCO3, 10.43% CaO and 27.48% MgO. Throughthe high-speed photographs of welding process, CaF2 can minimize the plasma volume but slightly improve the penetrationcapability. 相似文献
10.
The links of Motoman HP6 arc welding robot are considered as an open kinematic chain which consists of a series of rotational joints through concatenation. One end of the open chain is fixed to the base or the earth, and the other end which is free fastens the end executor to complete various duties. Each link of this arc welding robot has four kinds of Denavit-Hartenberg parameters: common normal length between two adjacent links, angle of two adjacent joints, distance between the crossing of common normal length and two joints axes, and angle of two adjacent links. The displacement relation between each link of the Motoman HP6 arc welding robot is introduced, and the kinematic positive-going solution and the kinematic passive-going solution are calculated. 相似文献