共查询到20条相似文献，搜索用时 78 毫秒
1.
王国强 《课堂内外(高中版)》2009,(6)
何为"蝴蝶效应"?意思是说:蝴蝶扇动翅膀,导致其身边的空气系统发生变化,并引起微弱气流的产生,而微弱的气流又会引起它周围空气或其他系统相应的变化,由此引起连锁反应,最终导致其他 相似文献
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“一只蝴蝶在巴西轻拍翅膀,可以导致一个月后美国德克萨斯州的一场龙卷风。”这是美国气象学家、混沌理论之父爱德华·洛伦兹提出的“蝴蝶效应”。其原因在于,蝴蝶翅膀的运动,导致其身边的空气系统发生变化,并引起微弱气流的产生,而微弱气流的产生又会引起它四周空气或其他系统产生相应的变化,由此引起连锁反应,最终导致其他系统的极大变化。 相似文献
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早产儿皮肤薄、娇嫩,当遇到轻微外力或磨擦时,很容易引起损伤和感染。新生儿抵抗力弱,任何原因引起的早产儿皮肤破损、擦伤都容易引起感染,所以保持早产儿皮肤的清洁卫生,减少对其皮肤的刺激,是早产儿皮肤护理的重要一环。 相似文献
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青少年是社会的未来,祖国的希望,青少年是否健康成长关系到祖国的兴衰成败。从引起青少年违法犯罪的家庭环境、学校环境、社会环境分析了其成因,并针对其原因提出了一些对策措施建议,以期引起社会的关注,为青少年成长构建健康、良好的社会环境。 相似文献
5.
要注意选择家访的对象
一般而言,如下几类学生应作为首选对象：思想不稳定,波动较大,而教师一时又找不到原因的;学习急剧滑坡,需要引起关注的;有不良习惯,需要家长与教师一起来帮助其改变的;出现了严重错误,需要引起家长高度重视的;家庭生活困难,需要教师了解其具体隋况的;家庭出现问题,对其带来思想包袱和负面影响的;师生之间产生矛盾、关系紧张,需要家长做学生工作的;可能患有某种疾病,需要引起家长注意的。 相似文献
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过程导向的教学观——来自蝴蝶效应的启示 总被引：4，自引：0，他引：4
一、蝴蝶效应——注重过程
一只南美洲亚马逊流域热带雨林中的蝴蝶,偶尔扇动几下翅膀,就可能会在两周后引起美国德克萨斯州的一场龙卷风。这就是气象学家洛仑兹提出的蝴蝶效应。其原因在于,蝴蝶翅膀的运动导致其身边的空气系统发生变化,并引起微弱气流的产生． 相似文献
8.
史占华 《河北北方学院学报(医学版)》1995,(1)
脑脊液分流术是先生性、继发性脑积水,为防止高颅压、脑疝的重要辅助治疗措施。各种脑脊液分除流术险引起独特的并发症(如脑室一腹腔分流术引起的腹部并发症,脑室-心房分流术引起的心血管并发症等)外,都可引起颅内并发症。其临床最常见的并发症有: 一、颅内感染:颅内感染是脑脊液分流术引起的常见并发症,发生率4-10％。George等,回顾25年间800例分流术,感染 相似文献
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吴守文 《湖州师范学院学报》1998,(5)
要提高学生数学能力,就必须注意激发学生的求知欲,培养他们学习数学的兴趣.其具体做法可从引起学生对学习的期待;引起学生的认知冲突;引起学生紧张的心理活动;给学生予成功的满足;保持刺激的新颖和变化等方面实施,从而有效地提高数学教学效率 相似文献
10.
巴甫洛夫说过：人们的每一句话,都要引起别人大脑皮层中的一个兴奋点,从而使其理解这些话进而形成概念并记忆。越是引起较强的兴奋,理解亦较深,记忆亦更巩固。 相似文献
11.
彭勇宜 《湖南城市学院学报》2002,19(3):45-47
人工诱导鱼类细胞融合是细胞工程中的一项重要技术 .鱼类细胞是一种比较理想的融合材料 .概述了鱼类细胞融合研究的发展和主要成果 ,鱼类细胞融合技术主要包括病毒法、PEG法、电融合法、激光微束法 .同时指出了鱼类细胞融合中的值得继续探讨的问题 相似文献
12.
Deepa Subramanyam 《Resonance》2013,18(6):514-521
Cellular reprogramming involves the conversion of a specialized cell into a cell which possesses properties similar to an embryonic stem cell. The Nobel Prize for Physiology or Medicine, 2012, was awarded jointly to two researchers, Sir John Gurdon and Shinya Yamanaka, for their creative and brilliant discovery involving the conversion of a mature differentiated cell into an immature cell, capable of giving rise to all the cell types in the body. This article discusses the manifold implications of this discovery. 相似文献
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Stem cells constitute an important class of cells in the body that have the ability to perpetuate themselves and remain in an uncommitted state by a process of self-renewal as well as to specialize into new cell types. Their ability to differentiate into multiple cell types marks the tremendous potential of stem cells for tissue repair and organ regeneration. Realization of this potential is rapidly opening up unexplored avenues for curing several ailments including diabetes and neurodegenerative diseases. However, very little is understood about the basic biology of stem cells. For example, what are the biochemical tags that allow us to identify stem cell? Which are the signaling pathways that regulate their function? How does the environment (niche) influence major decisions made by stem cell? Is stem cell therapy the end to all woes, or is there a flip side to the story? This article aims to give an overview of the current status of stem cell research and raises some alarming issues related to stem cell-based therapies. 相似文献
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M. Gail Jones James Minogue Tom Oppewal Michelle P. Cook Bethany Broadwell 《Journal of Science Education and Technology》2006,15(5-6):345-351
Science instruction is typically highly dependent on visual representations of scientific concepts that are communicated through textbooks, teacher presentations, and computer-based multimedia materials. Little is known about how students with visual impairments access and interpret these types of visually-dependent instructional materials. This study explored the efficacy of new haptic (simulated tactile feedback and kinesthetics) instructional technology for teaching cell morphology and function to middle and high school students with visual impairments. The study examined students’ prior experiences learning about the cell and cell functions in classroom instruction, as well as how haptic feedback technology impacted students’ awareness of the 3-D nature of an animal cell, the morphology and function of cell organelles, and students’ interest in the haptic technology as an instructional tool. Twenty-one students with visual impairment participated in the study. Students explored a tactile model of the cell with a haptic point probe that allowed them to feel the cell and its organelles. Results showed that students made significant gains in their ability to identify cell organelles and found the technology to be highly interesting as an instructional tool. The need for additional adaptive technology for students with visual impairments is discussed.This material is based upon work supported by the National Science Foundation under Grant Numbers 0354578 and 0411656 相似文献
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刘宏 《淮南师范学院学报》2007,9(5):12-14
骨骼肌卫星细胞通过激活、基因表达、增殖分化途径主要形成成肌干细胞,维持、修复骨骼肌结构和功能.卫星细胞的活性受多种因素影响.主要从卫星细胞的激活、基因表达、增殖分化等活性和影响卫星细胞活性的各种相关因素两大方面对骨骼肌卫星细胞进行综述. 相似文献
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ZITOUNI Bariza BEN MOUSSA Hocine OULMI Kafia 《浙江大学学报(A卷英文版)》2007,8(9):1500-1504
The dimensions and the materials type limit the performance of fuel cell. The increase of the temperature in electrodes and electrolyte of the cell,is due to the over potential of activation (transfer of load),the over potential Ohmic (resistance of polarization),the over potential of reaction (heat released by the chemical reaction) and the over potential of diffusion. In this paper,we studied the thermo-electrical performance of an intermediate temperature solid oxide fuel cell (IT-SOFC) with electrode supported. The aim of this work is to study this increasing temperature of a single cell of an IT-SOFC under the influence of the following parameters: heat sources,functioning temperature and voltages of the cell,geometric configuration and materials type. The equation of energy in one dimension is numerically resolved by using the method of finite volumes. A computing program (FORTRAN) is developed locally for this purpose in order to obtain fields of temperature in every element of the cell. 相似文献
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燃料电池是具有较高的能源利用率又不污染环境的能源利用方式.目前,燃料电池的研究正在向商业化阶段过渡.固体氧化物燃料电池的应用在我国有着得天独厚的优势,我国在燃料电池方面的研究已经步入世界先进行列. 相似文献
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介绍太阳电池的物理原理,表征太阳电池特性的物理参数,阐述了大学物理实验中的太阳电池特性测试仪的结构原理及其实验内容和测试的方法、测试内容,并对实验进行分析总结. 相似文献
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通过建立大鼠有氧游泳训练和过度游泳训练运动心脏模型,观察长期不同负荷训练后心肌细胞HSP70的表达情况,探讨运动诱导心肌细胞HSP70表达的规律,旨在为进一步研究运动员心脏提供实验依据．研究结果表明,运动训练可诱导心肌细胞HSP70表达增强,并且HSP70的表达与运动负荷存在一定的关系,随运动负荷增加,其表达呈上升趋势． 相似文献