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项目式教学是通过"科研项目驱动、在做中学"的方式引导学生完成实际科研项目来达到课程的教学目标,形成以科研项目为主线、以学生为主体的新型教学模式.在实际的功能材料器件基础课程教学改革实践过程中,选取实际的科研项目来创设理论与实践平台,以小组协作的方式开展学习,加深了学生对课程知识体系和能力培养要求的理解,培养了问题分析、... 相似文献
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为探索以“学生为中心”的Python程序设计课程教学手段和策略,文章提出一种知识生态社区化模式的Python课程教学实践方法。该方法以DICE知识生态为基础,在完善和优化知识分布、知识互动、知识竞争、知识演化各阶段的教学设计内容基础上,建立了一种针对Python程序设计课程的知识社区新模式,通过知识演化过程后的交叉融合和科技知识传播,激发学生主动学习与本课程相关的课程内容和专业科技知识。教学实践表明,文章所提方法可以学生为中心,引导和促进学生主动学习和个性化学习,夯实学生的理论基础,并增加学生Python程序设计的知识储备。 相似文献
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以提高学生教育质量为基本点,分析了甘肃农业大学草业科学专业"草类植物种子学"课程教学面临的问题,即课堂教学"以教师为中心",大学生的主动、自主学习不足,重理论、轻实践,创新和创业教育欠缺,部分学生缺乏学习动力,学习积极性不高。针对以上问题,从优化课程内容、强化实践教学、鼓励学生参与科研项目、实践教学中处理好验证性和探索性实验的关系、鼓励批判性思考和学习、开展案例教学和课程考核体系改革等方面作了较详尽的阐述,从而促使草类植物种子学课程建设向高水平方向迈进。 相似文献
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论述了以“整合教学内容、优化教学方法、丰富实践教学、注重道德教育”为主旨的《乳制品工艺学》课程教学改革体系的建设与实践,坚持以学生为本,全面提高课程教学质量. 相似文献
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针对非化学专业基础化学实验课程教学现状和存在的问题,在对研究性教学进行理论分析的基础上,结合课程特点探索了以学生为主体的研究性教学的实施环节和保障措施.实践表明,研究性教学的实施对提高学生的实践能力、研究能力和创新能力具有积极推动作用,同时也提出了非化学专业基础化学实验课程开展研究性教学需要进一步解决的问题. 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献