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1.
林金梅 《北方牧业》2014,(12):216+274
《机械基础》是机械类学生的重要专业技术基础课,该课程的教学效果直接影响着学生专业课程的学习。面对中职学生知识基础薄、学习自制力低的情况,如何提高《机械基础》教学质量,提高学生的学习兴趣和主动性,本文针对该教学的改进作一些探讨。  相似文献   

2.
《机械基础》是机械类学生的重要专业技术基础课,该课程的教学效果直接影响着学生专业课程的学习。面对中职学生知识基础薄、学习自制力低的情况,如何提高《机械基础》教学质量,提高学生的学习兴趣和主动性,本文针对该教学的改进作一些探讨。  相似文献   

3.
机械基础教学是工程类专业教育的关键性内容之一,机械基础知识在工程领域的应用具有较强的广泛性和基础性,在此过程中需要通过教学方法的改进和教学模式的创新,提高学课程的课堂教学效率,保证学生的学习效果.由于在教学实践中发现,学生在学习机械基础课程过程中出现学习兴趣不高、学习目标不明确等问题,部分学生的学习思维不够活跃,缺乏自主创新精神,因而本篇文章在此基础上,主要对机械基础实践教学新体系的改革必要性和改革方法进行研究与分析.  相似文献   

4.
《机械基础》是中等职业学校机械专业学生必修的一门专业基础课,传统教学课堂枯燥乏味,可在《机械基础》课堂中开展趣味性教学改革,整合教学内容,改革教学过程,改进教学方法和教学设计,丰富教学形式,从根本上提高教学效果。  相似文献   

5.
<公差配合与技术测量>是职业学校机械、机电类学生学习专业课程的基础,依据高职教育的培养目标以及机械专业对课程的基本要求,通过优化教学内容,改革教学方法,注重操作训练,提高了学生对课程的学习兴趣,对所学知识的运用能力,取得满意的教学效果.  相似文献   

6.
本文在国家大力推行职业院校实践教学改革的背景下,根据机械专业《机械基础》课程特色,从提高学生学习兴趣和创新能力入手,提出了适宜于当前学生特点的情感教学法,分析了情感教学法在实践教学中的应用。  相似文献   

7.
《机械制图》教学是技工学校机械类专业的必修课,该课程是其他专业课程和实习课程的基础,学生对《机械制图》课程掌握情况将会影响他对整个机械专业知识的掌握。所以在《机械制图》教学过程中,我们要灵活运用辅助教具,培养学生三维空间现象力,优化课堂教学,创设情境,建立良好师生关系,激发学生学习兴趣,提高教学效果。  相似文献   

8.
《机械制图》教学是技工学校机械类专业的必修课,该课程是其他专业课程和实习课程的基础,学生对《机械制图》课程掌握情况将会影响他对整个机械专业知识的掌握。所以在《机械制图》教学过程中,我们要灵活运用辅助教具,培养学生三维空间现象力,优化课堂教学,创设情境,建立良好师生关系,激发学生学习兴趣,提高教学效果。  相似文献   

9.
《机械工程基础》是非机械类专业的一门专业性较强、抽象概念较多的专业基础课。本课程包括的知识内容较多,范围较广,学生的重视程度不够,学习积极性不高,因而学习效果不尽如人意。针对这些情况,通过优化教学内容,改进教学方法,激发学生学习兴趣,调动学生学习的积极性和主动性,提高学生学习效果。  相似文献   

10.
车工实习作为高校机械专业学生的基础课程,是应用型大学实践教学环节的重要组成部分,承担着培养学生实际动手操作能力的任务。本文分析了目前课堂教学和实践教学中存在的问题,针对新形势下如何切实提高学生的实践技能做了思考和总结,取得了良好的教学效果。  相似文献   

11.
12.
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   

13.
采用高效液相色谱法测定癸氧喹酯干混悬剂的含量,在2-250μg/mL范围内,峰面积的常用对数与进样量浓度的常用对数呈良好的线性关系,R^2=1(n=5),平均回收率为99.24%~99.51%,RSD在0.05%~0.28%。此方法分析时间短,样品前处理简便、定量结果准确,重现性好,结果满意,为其质量控制提供了依据。  相似文献   

14.
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   

15.
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   

16.
用硝酸和高氯酸消化蜂蜜,使硒游离出来,在微酸性环境下,硒和2,3-二氨基萘(DAN)生成有较强荧光的物质,用环己烷萃取,在激发波长378nm,荧光波长518nm处测定其荧光强度。蜂蜜中硒含量范围:0.10~0.82μg/g。表明:蜂蜜应视为天然富硒营养品。  相似文献   

17.
乳酸杆菌益生作用机制的研究进展   总被引:2,自引:0,他引:2  
乳酸杆菌作为益生菌广泛用于人和动物。本文综述了乳酸杆菌改善宿主健康的机制。乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道。文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和 Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制。  相似文献   

18.
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   

19.
为贯彻落实《兽药生产质量管理规范》(简称《兽药GMP》),进一步推动兽药GMP实施进程,我部制定了《兽药生产质量管理规范检查验收办法》,现予公告。本公告自2003年6月1日起施行。附件:兽药生产质量管理规范检查验收办法二○○三年四月十日第一章 总则 第一条 为推动《兽药生产质量管理规范》(以下简称兽药GMP)的实施,规范兽药GMP检查验收工作,制定本办法。 第二条 农业部负责全国兽药GMP管理和检查验收工作;负责制修订兽药GMP检查验收管理规定;负责兽药GMP检查员队伍建设和监督管理工作,负责国际兽药贸易中GMP互认工作。 …  相似文献   

20.
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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