QUADRATIC METHOD IN DETECTING 4-TONES OF PUTONGHUA

分析了普通话四种声调的元音基音周期随时间变化的规律。根据对应四种声调的不同的变化曲线，利用二次分析方法建立了一个实时的四声检测差别规则，并在实践中证明了这种判别规则的实用性。     

基于DDPG算法的风力发电机变桨距控制研究

风电机组模型的不确定性以及风速等外部干扰严重影响风电机组输出功率的稳定性,基于准确风机参数的传统控制策略难以满足系统控制需求。因此,本文提出一种基于DDPG算法的风机变桨距控制器。借助强化学习仅需与环境交互无需建模的优势,以风机模型为训练环境,功率为奖励目标,变桨角度为输出,采用深度神经网络搭建Actor-Critic单元,训练最优变桨策略。采用阶跃、低湍流、高湍流三种典型风况对算法进行检测。仿真结果表明,不同风况下基于DDPG算法控制器的控制精度、超调量、调节时间等性能均优于传统比例-积分-微分控制器效果。     

小模数齿轮齿距误差的CNC测量技术

模数０．０７～０．２ ｍｍ的小模数齿轮测量在国内外是一个空白。在对其特 　　　　点及测量难点进行分析的基础上，探讨了一种小模数齿轮齿距ＣＮＣ自动测　　　　　　量系统，应用绝对法测量原理及切向对正技术。对测量原理、控制方法、测量　　　　　　精度等进行了分析。经实测验证，证明了其原理的正确性及系统的可行性，可　　　　　　以完成模数ｍ≥０．０７～０．２　ｍｍ齿轮齿距的测量。     

煤沥青的电化学加氢──Ⅰ．原料煤沥青的预处理和组成结构分析

为选择适于作为碳纤维原料的煤沥青，对三种中低温煤沥青的预处理和组成结构进行了研究，同时对其中的太钢煤沥青进行了热缩聚制取中间相沥青的结构变化分析。研究分析结果表明，只要经过合适的工艺路线进行处理，这三种煤沥青都有可能作为沥青基碳纤维的原料。     

甲壳素类液晶高分子的研究Ⅶ.N,O-苄基壳聚糖的胆甾螺旋行为

N ,O-苄基壳聚糖在浓溶液中形成胆甾液晶相 .用圆偏光二向色性谱 (CD)研究了这一聚合物的螺旋行为 ,主要包括螺距和螺旋方向 .浓度越高 ,螺距P越大 ,意味着胆甾相的扭转力随浓度增加而减弱 .CD谱图上观测到两类吸收 ,即在 5 70nm附近较宽但较强的吸收和 330nm附近较尖但较弱的吸收 .前者归属于胆甾相层片的超分子螺旋构象 ,而后者可以归属于分子链的螺旋构象 .改变浓度或溶剂性质时这两个层次的构象都会发生符号的变化 .提高浓度 (固定二氧六环为溶剂 )时两种螺旋结构先后发生反转 .以氯仿为溶剂 (固定浓度为 6 5 % )时两种螺旋结构均为左旋 (正Cotton效应 ) ,但二氧六环和四氢呋喃为溶剂时均变为右旋 (负Cotton效应 ) .溶剂的影响可能与溶剂和高分子间形成氢键的能力有关     

Super wide-band reflective polarisers from polymer stabilised liquid crystal films

A polymer stabilised liquid crystal film with the order and the molecular alignment of a smectic-A phase at a microscopic level, but with the planar molecular alignment of a chiral nematic phase at a macroscopic level, was prepared. This kind of order and alignment of the molecules of the liquid crystal resulted in the film reflecting circularly polarised incident light with the bandwidth of the spectrum over the wavelength range of 300–2500 nm.     

Ferroelectric compounds with chiral (S)-1-methylheptyloxycarbonyl terminal chain – their miscibility and a helical pitch

Compounds with the same chiral terminal chain but different structure of rigid core and non-chiral terminal chain were added to basic highly tilted ferroelectric compound in the aim of establishing whether the miscibility of phases, especially ferroelectric phase, exists in these compounds and what are the helical pitch and tilt angle temperature dependence in bicomponent systems. In certain systems, we obtained a mixture with very short helical pitch at broad temperature range of ferroelectric phase, which open opportunities for the formulation of multicomponent mixtures for fast switching ferroelectric liquid crystals modes.     

The influence of antiferroelectric compounds on helical pitch of orthoconic W-1000 mixture

The influence of six antiferroelectric compounds on the helical pitch of mixture W-1000, which was reported as long pitch orthoconic antiferroelectric liquid crystalline mixture, was checked by spectrophotometry and polarimetry methods. The electro-optical properties for the mixture with the longest pitch were measured. An improvement in electro-optical response due to the long pitch is reported. The novelty in electro-optical properties is the good symmetry response.     

大理白语的并列复合词

文章从结构类型和词素顺序两方面对大理白语中的并列结构复合词进行考察,通过分析总结得出：在满足语义原则的前提下,大理白语并列复合词的词素顺序主要受音高制约,当前后两个词素音高相同时则按主要元音的舌位或逻辑关系并列。     

浅谈SBS改性沥青的施工工艺控制要点

结合太原市和平南路大型养护维修工程中SBS改性沥青混凝土路面的施工实践，从拌和、摊铺、碾压、接缝等过程阐述该材料的施工工艺控制要点。