高校高等数学课程教学的有效性思考

高校高等数学的教学和学习对于学生来说意义重大,高等数学在很大程度上是学生进入各个专业的工具和敲门砖,同时一些数学思维、能力的培养和形成同样也使得学生在解决其他问题的时候受益匪浅。因此,基于高等数学教学的如此重大作用,笔者对提高高等数学教学的有效性方面做了深入的研究和分析。     

基于网络教学平台和Mathematica的高等数学实验教学模式研究

文章针对传统模式下高等数学课程教学中存在的学生中心地位不突出、综合实践能力培养落实不到位等问题,结合现代教学理念和教学技术的发展,分析了开设高等数学实验项目的必要性和可行性。文章介绍了笔者在近几年的教学实践中构建的基于网络教学平台和Mathematica软件的“学生中心,能力核心,问题主线”的高等数学实验教学模式。通过教学案例展示了高等数学实验教学的组织实施过程和教学平台、数学软件在辅助教学中的应用,分析了高等数学实验教学在激发学生学习兴趣、培养学生综合实践能力和创新能力等方面的积极作用。     

积分在初等数学中的应用

积分是高等数学的基础,是人类文化的宝贵财富,能否用高等数学乃至现代数学的思想、观点和方法来分析、认识初等数学的内容,高屋建瓴地处理教材,也是高等学校数学专业学习的一个重要问题。本文从十二个方面论述了积分在初等数学中的应用,以说明积分对初等数学研究和教学的指导作用。     

数学在电气自动化的应用分析

高等数学在电气自动化中的应用是非常广泛的。高等数学是学校电气自动化专业学生所需要学习的重要学科。本文主要阐述了高等数学的特点以及地位,然后具体通过实际教学中的案例分析了高等数学在电气自动化中的具体应用,希望对电气自动化专业的学生学习高等数学有一定的借鉴性意义。     

组建数学兴趣小组提高学生创新能力——高等数学教学方法与实践

文章针对目前高等数学教学中存在的问题,提出了高等数学教学要转变教学观念,在教学中突出学生的创造性主体地位,以组建数学兴趣小组教学模式改变学生传统的学习状态,激发学生学习的积极性、主动性,真正达到培养学生创新能力的目标。     

Matlab在师范院校高等数学教学中的应用

高等数学是师范院校理科非数学专业的重要基础课程,该课程内容多,概念抽象,理论严密,对学生后继课程的学习以及研究生入学考试都有重要的作用。然而近些年大学生对高等数学的学习兴趣不浓,期末考试不及格的学生非常多。由此本文提出将传统高等数学教学方式进行适当的改革,将具有强大计算和绘图功能数学应用软件Matlab应用到高等数学教学中去,并给出了由matlab求微积分运算、极限、绘图的实例,作为教学的辅助手段,使枯燥的手工计算与计机算相结合提高学生学习的兴趣,从而也提高了课堂教学的效率。     

高等数学教学中开展数学实验的思考

本文结合目前普通高校学生学习高等数学的现状,提出将数学实验融入到高等数学教学中的必要性以及方法和途径。     

数学建模与计算机关系研究

高等数学与计算机教学具有内在相关性，尤其是在数学建模应用中，根据计算机学科发展来发挥数学建模理论的作用及效果，有助于增强学生对高等数学的理解和应用能力。基于此，本文笔者就从高等数学建模理论与计算机技术的关系研究入手，来阐述建模嵌入在计算机辅助教学中的重要潜力。     

数学与应用数学教学中存在的问题与对策

高等数学作为一门基础学科,高度的抽象性、严密的逻辑性和广泛的应用性.学习数学的过程主要目的是为了培养学生的逻辑思维能力,对学生以后的学习具有很大帮助.文章主要论述现阶段数学教学中出现的问题,并提出相应的解决对策.     

论高等数学中分组合作学习的教学策略

针对目前高职院校中高等数学教学中存在的问题,本文阐述了根据学生的数学基础、学习习惯等,采取分组合作教学的教学方法和策略,同时介绍了分组合作教学在南京信息职业技术学院中的具体应用。     

商会自治的基石——商会自治规范研究

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。     

癸氧喹酯干混悬剂含量测定的改进

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。     

猪毛色遗传的研究进展

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。     

Comparison of 2 methods of centesis of the bursa of the biceps brachii tendon of horses

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.     

不同样本商品蜂蜜中硒含量的测定

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。     

乳酸杆菌益生作用机制的研究进展

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。     

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.     

Mechanism of Action of Probiotic Function of Lactobacilli

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.     

中华人民共和国农业部公告 第267号

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。 …