Speech emotion recognition based on statistical pitch model

A modified Parzen-window method, which keep high resolution in low frequencies and keep smoothness in high frequencies, is proposed to obtain statistical model. Then, a gender classification method utilizing the statistical model is proposed, which have a 98% accuracy of gender classification while long sentence is dealt with. By separation the male voice and female voice, the mean and standard deviation of speech training samples with different emotion are used to create the corresponding emotion models. Then the Bhattacharyya distance between the test sample and statistical models of pitch, are utilized for emotion recognition in speech. The normalization of pitch for the male voice and female voice are also considered, in order to illustrate them into a uniform space. Finally, the speech emotion recognition experiment based on K Nearest Neighbor shows that, the correct rate of 81% is achieved, where it is only 73.85% if the traditional parameters are utilized.     

Enhanced slow light propagation in photonic crystal waveguides using angular properties of scatter elements

Applicability of the angular properties of scatter elements as a tool to achieve improved slow light performance with small group velocity dispersion and large bandwidth in photonic crystal waveguides is investigated. A polyatomic photonic crystal waveguide, including two scatter elements with different geometrical shapes in each primitive cell, is proposed to investigate the feasibility of our method. Numerical results show that a versatile control of the dispersion relation of slow light modes, with large normalized delay-bandwidth products ranging from 0.2085 to 0.3394, can be obtained using a unique geometrical parameter.     

N,N-二(2-羧基苯基)-2,6-吡啶二甲酰胺铕配合物的合成及光谱分析

合成了N,N-二(2-羧基苯基)-2,6-吡啶二甲酰胺(简称BCPD)铕配合物,通过元素分析、电导率测定、红外光谱及紫外光谱对其进行了结构表征。结果表明:标题配合物中稀土离子与配体以1∶1的方式结合,化学组成符合C23H21N3O8ClEu,并进一步探讨了配合物配位方式。固体荧光及荧光滴定光谱分析表明:配体与稀土离子间存在明显的"天线效应",铕离子在590,617 nm处的特征荧光敏化效果显著,因此该配合物有望成为理想的光致发光材料。     

Methane adsorption properties of N-doped graphdiyne: a first-principles study

Structural Chemistry - N-doped graphdiyne (N-graphdiyne) is a new kind of alkynyl carbon material whose structure resembles graphdiyne. This study describes the Mn-modified N-graphdiyne...     

光学系统时间畸变和色时间滞后的研究

本文对皮秒和飞秒技术中瞬态现象测量系统所用的特殊光学系统校正时间畸变和压缩色时间滞后的问题进行了讨论。实验证明用该方法设计研制的光学系统校正效果显着。     

一种多通道纳秒分幅相机

相机采用棱镜分光,薄片管增强象,电选通分幅。由四个薄片管组成四个通道,每一个通道代表一个单幅相机,分幅时序由专门电控电路进行控制,接触相机记录图象,最短曝光时间3ns,动态空间分辩率5～81lp/mm,最高分幅速率2×10⁸幅/秒,动态范围50°,在爆炸、激光、放电,光谱学等方面有广泛的应用。     

一缩二乙醇二甲基丙烯酸酯对真丝接枝的反应性

研究了一缩二乙二醇二甲基丙烯酸酯在空气存在下,用过硫酸钾(KPS)在水液 中对真丝的接枝。对接枝的条件,如单体、引发剂、甲酸(FA)和乳化剂OP的浓度以 及温度和时间对接枝率的影响进行了测试。发现了较佳的接枝条件是：温度 = 80 ℃,时间 = 30 min,[KPS] = 1.85% (owm),[OP] = 1% (owf),[FA] = 0.2%。 接枝率的大小可以用单体浓度来调节,接枝活化能是86.94 kJ/mol。     

A Novel Strategy for the Preparation of Reactively Compatibilized Polymer Blends with Oligomers Containing α‐Methyl Styrene Units

A novel strategy to prepare reactively compatibilized polymer blends is reported. An oligomer that consists of AMS (α‐methyl styrene) and GMA (glycidyl methacrylate) is initially synthesized. When this oligomer is melt blended with poly(propylene) (PP), the GMA units in the oligomer are successfully grafted onto the PP chain, which is proven by measuring the FT‐IR spectrum of the blended PP. When the oligomer is added to a blend of PP/Ny66, an in‐situ compatibilization occurs, which leads to an increase in torque values during blending, a decrease in crystallinity degree of Ny66, and is observed by SEM images of the resulting blends. The compatibilizing effects of the oligomer are also observed in PP/Ny6 and polyethylene/Ny6 blends. A relevant compatibilization mechanism is proposed.

     

Sol-Gel Synthesis of Hollow Zinc Ferrite Fibers

Hollow zinc ferrite fibers have been prepared via a facile citrate sol-gel process using Fe(OH)(HCOO)₂ prepared in laboratory and Zn(CH₃COO)₂⋅2H₂O as the original materials. The obtained hollow fibers were flexible and handlable with the outer diameter being 1–4 μm and the wall thickness less than 1 μm, and the fiber wall were made up of nanoparticles about 50 nm. Rheological behaviour of the precursor sol was tracked by Rheometer. The development of the gel fibers to zinc ferrite fibers was studied by IR, TG and XRD. Morphology observation of the fibers was given on SEM and TEM.     

ADSORPTION OF TANNIN FROM AQUEOUS SOLUTION ONTO MACROPOROUS CROSSLINKED POLY(N-VINYL-ACETAMIDE) VIA HYDROGEN BONDING

I INTRODUCTIONTannin is existed widely in the roots, stems and fruits of many plants 111. Tannin is stronglyastringent and puckery due to the hydrogen bonding between the phenolic hydroxyl groups intarmin and abide groups in Protein al. A series of PYOb\m won\d be abed if t~ is nOIremoved from the products made from plants. For example, the injection site of the patientwould be red and swollen if tannin had not been removed from the injection made from plantssuch as red-rooted sajvia; …