共查询到20条相似文献，搜索用时 62 毫秒
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高中物理教材中的“传感器的简单应用”的学生实验中，有一实验项目为计数器原理．我们制作了一个简易而又精确的计数器，可供学生课外制作参考． 相似文献
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为突破“法拉第电磁感应定律”教学难点,利用常规材料制作了一款简易的定量验证电磁感应定律的组合装置.详尽介绍了该教具的创新点、制作原理和主要用途.该教具与数字化手段相结合,测量精确、读数快捷、操作方便、实用性强,有较强的推广价值. 相似文献
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在Flash课件的制作过程中,需要对声音素材实现精确控制。介绍了用Flash软件中的Sound对象控制声音素材的具体实现方法。 相似文献
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郑泽芝 《山西教育(综合版)》2000,(13)
计算机辅助教学方式作为现代教育技术的推广和应用 ,正日益受到人们的重视 ,其中的 CAI课件制作随处可见 ,从计算机公司到大中小学教师 ,纷纷加入到 CAI课件制作队伍之中。如何使制作的 CAI课件达到实用、有效又经济的目的呢 ?本文提出一些策略与大家共商。一、精选题目选题是制作 CAI课件的关键一步。因为不是各学科的所有内容都适宜制作 CAI课件 ,所以精确选题既能体现教师的教学看法、水平 ,又可减少不必要的浪费和重复。制作 CAI课件要考虑教学效果、经济效益。对于那些可以用常规教学法 (如投影仪、幻灯片 )就能很好地实现教学… 相似文献
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齐雪明 《中国校外教育(理论)》2010,(3):56-56
蒙版是Photoshop中最准确的选择工具和遮盖工具,是制作图像特殊效果的重要技术。利用蒙版可以自由、精确地选择形状、色彩区域。从某种程度上讲,它是Photoshop中最准确的选择工具。 相似文献
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毛细管电泳中固定套管式电极定位装置的改进 总被引：1，自引：1，他引：0
研究采用固定套管式电极调节定位方式,实现了工作电极与毛细管检测端口的完美对接。将两石英玻璃套管(内径400μm)经精确准直后固定在检测池中,工作电极由细微的石英玻璃毛细管(外径375μm,内径200μm)制作而成,工作时只需将制作的工作电极和电泳毛细管(石英玻璃质,外径375μm)分别插入套管,在两套管(间距约3 mm)中部轻微接触对接即可。该方法定位精确,操作简单方便,工作效率高,检测重现性好,较目前市面上部分使用的三维自由调节方式和螺杆调节方式的检测池有明显的优势和实用意义。 相似文献
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廖春蓝 《宁波职业技术学院学报》2007,11(2):49-51
以采用AT90S8535型AVR单片机设计制作的智能玩具车为例,介绍了AVR单片机的特点和工作机理。阐述了基于AVR单片机的精确驱动控制系统的设计与开发方法,对智能玩具的开发设计具有一定的参考和推广价值。 相似文献
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邓祖才 《四川职业技术学院学报》2012,22(5):142-146
在工业生产中,经常会有许多金属薄板制件.这些金属板制件在制作过程中必须先在金属板上画出展开图,然后划线、下料、工序加工成型,最后焊接或铆接而成.利用图解法可以较为方便地制作这些制件的表面展开图,从而实现金属板件的精确下料. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献