试论信息技术与物理实验教学的整合

论述了在“课改”的新形势下，为了提高物理实验教学的效益，克服传统物理教学之弊端，必须搞好信息技术与物理实验教学的整合工作。     

海岛地区英语教学现状调查与思考——以浙江舟山地区英语教学为例

本文以问卷的形式通过对海岛地区英语教学现状的调查，分析了教法与大纲要求不和谐的主要原因和师资培训中存在的实际问题，对海岛地区如何改进师资培训，提高英语教学质量提出建议。     

英语不定冠词用法浅析

英语不定冠词在英语中使用率很高,英语名词中的可数和不可数特点使中国的英语初学者难以掌握不定冠词的用法。英语的不可数名词不能冠以不定冠词,但当不可数名词受到形容词或介词短语的修饰或限定时却变成可数名词,因而可以受到不定冠词的修饰,表示某种个别的或特殊的情况。     

A learning-based method to detect and segment text from scene images

This paper proposes a learning-based method for text detection and text segmentation in natural scene images. First, the input image is decomposed into multiple connected-components (CCs) by Niblack clustering algorithm. Then all the CCs including text CCs and non-text CCs are verified on their text features by a 2-stage classification module, where most non-text CCs are discarded by an attentional cascade classifier and remaining CCs are further verified by an SVM. All the accepted CCs are output to result in text only binary image. Experiments with many images in different scenes showed satisfactory performance of our proposed method.     

自由是真善美的统一——“自由”定义考略

本文拟对“自由”定义之演变略作考辩,旨在说明自由应理解为人的活动状态和境界.自由不只是如马列经典作家所言,是“对必然的认识和对客观世界的改造”,而是人的活动的自觉自为自主状态,自由是真善美的统一.自由作为表明人与客观必然性关系的总概念,就其发展趋势和归宿而言,是人类活动的最佳状态和最高境界.     

Shear capacity of reinforced concrete columns strengthened with CFRP sheet

INTRODUCTION There is increased need in recent years for strengthening or rehabilitation of existing reinforced concrete structures adversely affected by overloading, construction material deterioration, seismic loads, structural deformation, etc. An effective method for increasing the shear capacity of reinforced concrete columns is the use of externally bonded carbon fiber reinforced plastic (CFRP) systems (ACI, 2002). FRP systems were first applied to reinforced concrete col-umns i…     

Molecularly imprinted polymers as the extracted sorbents of clenbuterol ahead of liquid chromatographic determination

A pre-treatment methodology for clenbuterol hydrochloride (CLEN) isolation and enrichment in a complex matrix environment was developed through exploiting molecularly imprinted polymers (MIPs). CLEN-imprinted polymers were synthesized by the combined use of ally-β-cyclodextrin (ally-β-CD) and methacrylic acid (MAA), allyl-β-CD and acrylonitrile (AN), and allyl-β-CD and methyl methacrylate (MMA) as the binary functional monomers. MAA-linked allyl-β-CD MIPs (M-MAA) were characterized by Fourier transform-infrared (FT-IR) spectroscopy and a scanning electron microscope (SEM). Based upon the results, M-MAA polymers generally proved to be an excellent selective extraction compared to its references: AN-linked allyl-β-CD MIPs (M-AN) and MMA-linked allyl-β-CD MIPs (M-MMA). M-MAA polymers were eventually chosen to run through a molecularly imprinted solid-phase extraction (MISPE) micro-column to enrich CLEN residues spiked in pig livers. A high recovery was achieved, ranging from 91.03% to 96.76% with relative standard deviation (RSD) ≤4.45%.     

In vitro remineralization of hybrid layers using biomimetic analogs

Resin-dentin bond degradation is a major cause of restoration failures. The major aim of the current study was to evaluate the impact of a remineralization medium on collagen matrices of hybrid layers of three different adhesive resins using nanotechnology methods. Coronal dentin surfaces were prepared from freshly extracted premolars and bonded to composite resin using three adhesive resins (FluoroBond II, Xeno-III-Bond, and iBond). From each tooth, two central slabs were selected for the study. The slabs used as controls were immersed in a simulated body fluid (SBF). The experimental slabs were immersed in a Portland cement-based remineralization medium that contained two biomimetic analogs (biomineralization medium (BRM)). Eight slabs per group were retrieved after 1, 2, 3, and 4 months, respectively and immersed in Rhodamine B for 24 h. Confocal laser scanning microscopy was used to evaluate the permeability of hybrid layers to Rhodamine B. Data were analyzed by analysis of variance (ANOVA) and Tukey’s honest significant difference (HSD) tests. After four months, all BRM specimens exhibited a significantly smaller fluorescent area than SBF specimens, indicating a remineralization of the hybrid layer (P≤0.05). A clinically applicable biomimetic remineralization delivery system could potentially slow down bond degradation.     

试论现代远程教育在终生学习中的作用

近几年来,教育观念和教育手段都在发生着前所未有的变化,尤其是教育手段的变化使得传统教育正在面临着根本性变革;在教育部发表的《面向21世纪教育振兴行动计划》中,将发展远程教育,构建终生学习体系作为其中的一项重要内容.本文在分析终生学习特征的基础上,论述现代远程教育在终生学习中的作用.