基于听感知特征的英语句子重音检测

为了更有效地提取英语句子重音,提出了一种基于听感知特征的方法。根据音素特点,改进段长的归一化方法;根据听感知特性,引入半音程和响度特征,并以归一化的音节最高值代替其平均值,系统正确率达到78.7%,漏检率为9.37%。在此基础上,还提出了基于掩蔽效应的突显度模型,系统正确率提高到83.4%,漏检率下降到5.72%。实验表明,突显度模型更符合人的听感知,其性能接近人工标注的一致率(约为86%)。系统还具有文本无关和说话人无关的优点。     

高师美术专业基础教学中创造性思维的培养

高师美术基础教学不仅要注重专业技能训练，更应该注意学生在基本技能训练中加强创造性思维的培养。从多方面来分析、探讨怎样培养学生创造性思维的方法很有必要。     

Synthesis and applications of novel fluoroalkyl end‐capped cooligomers containing diphenylacetylene segments: a new approach to the surface arrangement of diphenylacetylene segments on the traditional organic polymer

Fluoroalkyl end‐capped cooligomers containing diphenylacetylene segments [R_F‐(DPMA)_x‐(Co‐M)_y‐R_F] were prepared by reaction of fluoroalkanoyl peroxide with 4‐(phenylethynyl)phenyl methacrylate (DPMA) and radical polymerizable comonomers such as N,N‐dimethylacrylamide (DMAA) and acryloylmorpholine (ACMO) under very mild conditions. Fluorinated cooligomers containing diphenylacetylene segments thus obtained exhibited a good solubility in a variety of organic solvents. These fluorinated cooligomers were also applied to the surface modification of traditional organic polymers such as poly(methyl methacrylate) (PMMA) to exhibit not only a good surface active property imparted by fluorine but also a fluorescent characteristic related to diphenylacetylene segments on their surface. In addition, these fluorinated cooligomers could form the nanometer size‐controlled fluorinated molecular aggregates in chloroform. Interestingly, some benzenes and biphenyl (BP) derivatives could interact with these fluorinated oligomeric aggregates as guest molecules, and in particular 2‐chloro‐5‐nitrobenzotrifluoride (CNB) was most effective for enhancing the fluorescent intensity of these guest molecules. Copyright © 2009 John Wiley & Sons, Ltd.     

鼻咽癌放疗后的听觉脑干电反应

观察到一组无脑干病损临床表现的鼻咽癌放疗患者听觉脑干电反应的改变，包括反应阈升高、波峰潜伏期延长和波峰同潜伏期延长等，反映了中耳、耳蜗、听神经和脑干的放射性损伤，提示ＡＢＲ在早期发现ＮＰＣ放疗所致脑干型放射性脑病方面有重要价值。     

Isolating Segments, Fixed Point Index, and Symbolic Dynamics: III. Applications

We prove the existence of complicated dynamics in some class of periodic systems on the plane. The proof is based on the continuation of the considered system to the model one.     

栀子花试管快速繁殖的研究

栀子花具芽茎段在适宜浓度的ＢＡ，Ｋｔ与ＮＡＡ的ＭＳ培养基中，可获得增殖芽丛。切割芽丛继代培养进行苗的增殖。ＮＡＡ利于出根，ＩＢＡ有助于根的伸长。２０ｄ试管苗生根率达１００％，小苗移栽成活率达８５％－９０％。     

聚苯乙烯微球表面的链段堆积状态

聚苯乙烯微球表面的链段堆积状态徐伟，陈殿勇，华中一，吕绪良，胡建华，府寿宽（复旦大学材料科学系，上海，２００４３３）（复旦大学高分子科学系）关键词聚苯乙烯微球，聚合物链段，聚集态，扫描隧道显微镜用微乳液聚合法制备的聚苯乙烯微球与常规聚苯乙烯相比有许多...     

Synthesis of biodegradable amphiphilic AB‐type diblock copolymers of lactide and depsipeptide with pendant reactive groups

The syntheses of amphiphilic AB‐type diblock copolymers composed of hydrophobic polylactide segment and hydrophilic polydepsipeptide segment with amino or carboxyl groups were performed. The protected cyclodepsipeptides cyclo[Glc‐Lys(Z)] and cyclo[Glc‐Asp(OBzl)] (where Glc is glycolic acid, Lys is lysine, Asp is aspartic acid, Z is benzyloxycarbonyl, and OBzl is benzyl) were first polymerized in tetrahydrofuran (THF) with potassium ethoxide as an initiator to obtain the corresponding protected polydepsipeptides. After the terminal hydroxyl groups of the protected polydepsipeptides were converted into the potassium alcoholates with K/naphthalene, L ‐lactide was polymerized in the presence of the corresponding polymeric alcoholates as macroinitiators in THF to obtain poly[Glc‐Lys(Z)]‐block‐poly(L ‐lactide) and poly[Glc‐Asp(OBzl)]‐block‐poly(L ‐lactide). Subsequent deprotection of Z and OBzl groups gave the objective amphiphiles poly(Glc‐Lys)‐block‐poly(L ‐lactide) and poly(Glc‐Asp)‐block‐poly(L ‐lactide), respectively. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1218–1225, 2002     

STUDY ON SEGMENTED POLYURETHANE WITH MIXED SOFT SEGMENTS OF POLYCHLOROMETHYL METHYL SILOXANE AND POLYTETRAMETHYLENE OXIDE

Two series of polyurethanes based on mixed polychloromethyl methyl siloxane and poly-tetramethylene oxide in different weight fractions were synthesized. The phase separation ofsamples was studied using DSC and dynamic mechanical property analysis. The results showedthat the introduction of chloromethyl group into polysiloxane increased its polarity and henceimproved the miscibilities with polytetramethylene oxide and polyurethane hard segment.Particularly, in the case of N-methyldiethanolamine extended materials, the surface and tensileproperties of these samples can be adjusted by various ratios of two soft segments.     

GIS中平面线元误差带的概率分析

将线元看作一个由许多无限接近的点构成的随机过程,这些点坐标的联合概率密度可以用来描述平面线元的概率,而平面线元落在某一区间内的概率,可以通过这些点在线元垂直方向的误差曲面构成的体积通过数值计算得到.采用数值积分方法计算了平面线元落在不同区间内的概率并进行模拟,最终得到平面线元误差指标和误差缓区带的合理确定方法.