多媒体手段在物理教学中的几点尝试

多媒体技术的发展为职教物理教学提供了更为便利的方法。它把声音、图像、动画、影像等结合起来,突破时间和空间的障碍,把自然界中的现象真切、丰富、立体化的展现出来,激发学生的学习积极性和主动性,提高教学效率。     

试论物理信息题建模策略

信息题的命题形式是当前考试命题热点，它以最新科技动态或将物理史实作为知识的载体，考查学生提取信息、获取新知识，再运用新知识，解决实际问题的能力．由于取材新颖，学生在解决过程中往往感到困惑；笔者经过近几年的观察与研究，认为其根本问题在于物理建模思维的缺损．     

谈谈观察方式

 观察就是人们有目的、有计划地通过自己的感官去反映自然界各种事物现象的活动。观察是一种感性认识活动,离开观察,人们就无法感知五光十色的自然界和丰富多彩的社会生活,也无法从事各种社会实践活动;观察是思维的前提,没有观察,人们就不能进行思维、情感和意志等活动;一切科学实验及科学规律的新发现,都是建立在周密的、精确系统的观察基础之上的。巴甫洛夫一直把“观察、观察、再现察”作为座右铭,并告诫学生:“不学会观察,你就永远当不了科学家”。所谓观察方式,就是为获取观察对象的信息而采取的不同观察途径、手段和形式。随着社会的发展和观察实践的深入,人类开展观察的方式日趋丰富。     

Correlations of Active Galactic Nuclei with Microquasars

Correlations of active galactic nuclei （AGNs） with microquasars are discussed based on the coexistence of the Blandford-Znajek （BZ） and magnetic coupling （MC） processes （CEBZMC） in black hole （BH） accretion disk. The proportions of several quantities of BH systems for both AGNs and microquasars are derived by combining the observational data with CEBZMC. It is shown that the square of the magnetic field at the BH horizon is inversely proportional to the BH mass, while the accretion rate of the disk is proportional to the BH mass. In addition, the very steep emissivity indexes from the recent XMM-Newton observations of the nearby bright Seyfert 1 galaxy MCG-6-30-15 and the microquasars XTE J1650-500 are well fitted by considering the MC effects on the disk radiation. These results suggest strongly the correlations of A GNs with microquasars.     

Co离子注入TiO2薄膜的显微结构和磁性研究

利用直流磁控溅射技术在玻璃衬底上沉积了TiO₂薄膜,并对其进行了Co离子注入,最后在真空中500 ℃退火50 min,得到系列薄膜样品. 利用剥离-分散方法制备了薄膜的透射电镜样品,并用扫描电镜(SEM)、X射线能量散射谱(EDX)和高分辨透射电镜(HRTEM)对样品做了近似原位观察,研究了薄膜样品中不同Co离子注入深度的成分分布和显微结构. 结果表明,薄膜呈锐钛矿结构,Co元素主要分布在薄膜表层,Co离子的注入使TiO₂薄膜的晶粒被部分破坏,并形成CoO,而5 关键词： 2薄膜')" href="#">Co注入TiO₂薄膜 电镜原位观察 室温铁磁性     

自制教具为实验教学添光彩

物理课中的演示实验很多，演示实验的成功与否，质量高低，对提高物理教学质量有举足轻重的作用．如何提高演示实验教学的质量呢？自制教具是一条很好的途径．它不但能补充仪器不足，减轻学校经费开支，更重要的是能提高教学质量，而且有助于培养师生的动手操作能力、观察能力、独立分析问题和解决问题的能力以及实事求是的科学态度、创新意识和创造能力；同时也使学生受到良好的科技意识教育．笔者结合多年的实验研究，认为从以下几个方面进行教学，可使实验教学取得很好的效果．     

GISAXS and SAXS studies on the spatial structures of Co nanowire arrays

The spatial structures of magnetic Co nanowire array embedded in anodic aluminium membranes were investigated by grazing incidence small angle X-ray scattering (GISAXS) and conventional small angle X-ray scattering (SAXS) techniques. Compared with SEM observation, the GISAXS and SAXS measurements can get more overall structural information in a large-area scale. In this study, the two-dimensional GISAXS pattern was well reconstructed by using the IsGISAXS program. The results demonstrate that the hexagonal lattice formed by the Co nanowires is distorted (a ≈ 105 nm, b ≈ 95 nm). These Co nanowires are isolated into many structure domains with different orientations with a size of about 2 μm. The SAXS results have also confirmed that the nanopore structures in the AAM can be retained after depositing Co nanowires although the Co nanowires can not completely but only just fill up the nanopores. These results are helpful for understanding the global structure of the Co nanowire array.     

维丁胶性钙佐治婴幼儿非感染性腹泻临床观察

我院儿科自 1999年 2月以来应用维丁胶性钙佐治婴幼儿非感染性腹泻 ,取得了较好效果 :1　资料与方法1.1对象男 74例 ,女 3 2例 .年龄 48天～ 3岁 ,1岁以内 78例 ( 73 .6% ) .母乳喂养 66例 ( 62 % ) ,混合喂养 2 1例 ( 19.8% ) ,人工喂养 19例 ( 17.9% ) .诊断标准按中国腹泻病诊断治疗方案[1] ,病例选择除外有脓血便及中度以上脱水 ,大便镜检白细胞 >5个 /ＨＰ患儿 .腹泻天数 1～ 4ｄ 72例 ( 68% ) ,≥ 5ｄ 3 4例 ( 3 2 % ) ;腹泻频度 <5次 /ｄ 5 8例 ( 5 5 % ) ,>5次 /ｄ 48例( 45 % ) .除腹泻外 ,伴呕吐 3 4例 ( 3 2 % ) ,发热 2 7例 ( 2…     

Characterizing variable for the critical point in momentum space

The possible experimentally observable signal in momentum space for the critical point, which is free from the contamination of statistical fluctuations, is discussed. It is shown that the higher order scaled moment of transverse momentum can serve as an appropriate signal for the critical point, provided the transverse momentum distribution has a sudden change when energy increases passing through this point. A 2-D percolation model with a linear temperature gradient is constructed to check this suggestion. A sudden change of third order scaled moment of transverse momentum is observed.