有关透镜组合基点基面公式的讨论

本文以两个共轴透镜组成的光学系统为例,结合具体的光路图,推导出主点和节点的计算公式,其过程简单,物理意义清晰。     

白桦派文学创作主题阐析

日本大正时代重要的文学流派——白桦派的创作主题是反对战争、反对压迫、追求和平，反对旧道德对自我的束缚，同情弱小者，表现强烈的自我意识。这一主题是与第一次世界大战前后活跃的民主主义社会思潮紧密联系的。本文试图对其创作主题的内容及其产生的社会背景进行分析。     

QR码在手机图书馆中的应用

QR码作为二维码中的一种,具有容量大、可靠性高等优势。伴随手机图书馆的逐步建设,QR码与短信、手机网站等结合,广泛应用于书目联机查询系统(OPAC)、研读间预约等场景,促使图书馆服务的时空、方式得到拓展和延伸。简要介绍QR码的基本情况后,针对目前手机图书馆中QR码的几种具体应用形式进行分析,并指出该技术在图书馆推广过程中需要注意的问题。随着3G时代的到来、智能手机的普及,QR码在图书馆服务中将发挥更大的作用。     

Relative bioavailability and pharmacokinetic comparison of two different enteric formulations of omeprazole

In order to comply with the requirements for a drug listed in China, the study was developed to compare the pharmacokinetics and relative bioavailability of two different enteric formulations of omeprazole (OPZ) in healthy Chinese subjects. A total of 32 volunteers participated in the study. Plasma concentrations were analyzed by nonstereospecific liquid chromatography/tandem mass spectrometric (LC-MS/MS) method. After administration of a single 40-mg dose of the two OPZ formulations, the comparative bioavailability was assessed by calculating individual AUC_0−t (the area under the concentration-time curve from time zero to the last measurable concentration), AUC_0−∞ (the area under the concentration-time curve extrapolated to infinity), C _max (the maximum observed concentration), and T _peak (the time to C _max) values of OPZ, 5-hydroxyomeprazole (OH-OPZ), and omeprazole sulfone (OPZ-SFN), respectively. The 90% confidence intervals (CIs) of AUC_0−t , AUC_0−∞, and C _max were 85.4%–99.0%/88.8%–98.6%/87.6%–99.4%, 85.5%–99.2%/89.0%–98.6%/88.5%–101.3%, and 72.3%–87.6%/79.6%–91.1%/88.4%–99.1% for OPZ/OH-OPZ/OPZ-SFN, respectively, and T _peak values did not differ significantly. In this study, the test formulation of OPZ in fasting healthy Chinese male volunteers met the Chinese bioequivalance standard to the reference formulation based on AUC, C _max, and T _peak.     

90后学生特点分析及教育策略

90后与80后学生有不同的心理与行为特点,对他们的教育是中高职学校面临的新问题。本文对90后成长的时代背景、心理和行为特征进行了分析,提出了对90后学生的教育思路和策略。     

小型光电跟踪系统中基于Hough变换的形状检测

REVS-50M型小型光电跟踪系统的图像处理部分采用颜色阈值的方法检测手动靶标,由于相同颜色的物体进入图像检测区域而导致误跟踪。针对此问题进行改进,应用Hough变换检测形状的方法检测圆形手动靶标,消除了误跟踪,实现了转台对靶标的正确跟踪,创造了良好的实验条件。     

Mining subtopics from text fragments for a web query

Web search queries are often ambiguous or faceted, and the task of identifying the major underlying senses and facets of queries has received much attention in recent years. We refer to this task as query subtopic mining. In this paper, we propose to use surrounding text of query terms in top retrieved documents to mine subtopics and rank them. We first extract text fragments containing query terms from different parts of documents. Then we group similar text fragments into clusters and generate a readable subtopic for each cluster. Based on the cluster and the language model trained from a query log, we calculate three features and combine them into a relevance score for each subtopic. Subtopics are finally ranked by balancing relevance and novelty. Our evaluation experiments with the NTCIR-9 INTENT Chinese Subtopic Mining test collection show that our method significantly outperforms a query log based method proposed by Radlinski et al. (2010) and a search result clustering based method proposed by Zeng et al. (2004) in terms of precision, I-rec, D-nDCG and D#-nDCG, the official evaluation metrics used at the NTCIR-9 INTENT task. Moreover, our generated subtopics are significantly more readable than those generated by the search result clustering method.     

班级梦与班主任管理艺术

近年来,由于受到功利主义、个人主义等因素影响,班主任管理工作面临学生价值观念冲突、心理失衡、行为失范、班级凝聚力低等因素的挑战。基于此,本文从"班级梦"入手,以班主任作为班级的领军人物,探讨新的学生工作思路和途径,以期对班主任管理艺术的提升有所启发。     

幼儿园校车安全管理的对策研究——以《校车安全管理条例》实施为背景

《校车安全管理条例》可以说为幼儿园校车管理画出了一条清晰可辨的安全线,但《条例》对幼儿园校车采取的是“不提倡,特殊情况下允许”的态度.目前,幼儿园校车安全事故的归责主要依据“过错推定责任”原则,其责任认定主要依据《侵权责任法》.研究者认为,幼儿园应建立健全校车安全管理制度,对相关人员加强交通安全教育,建立校车交通事故应急救援预案,做好校车、驾驶人员档案管理工作,强化证据意识,等等,以确保幼儿园校车安全管理工作落到实处.     

文化哲学视角中的休闲体育透视

如何休闲、提高我们的生活和生命质量,将是一个事关社会和人类自身健康和谐发展的重要话题.当今.休闲体育已经发展成为我们这个时代主要的特征之一.成为人类社会文化活动的重要组成部分,成为与我们每个人的生命状态忠息相关的文化领域.本文试图从文化哲学的视角.透视休闲体育的精神底蕴.