四重氢键自组装体系的设计与应用

氢键是自然界中最基本的分子间弱相互作用力之一,是构筑超分子自组装体系的理想推动力。近年来,构筑性能优良的多重氢键组装体系已经成为超分子化学的一个热门研究领域。其中,四重氢键组装体系因具有较强的结合力、合成简单、结构易于修饰以及可预测的识别性能等优点,在构筑超分子组装体方面得到了广泛应用。本文综述了四重氢键组装体系的研究进展,重点介绍了各类四重氢键体系的设计思路及其应用。     

荧光液晶分子α-氰基二苯乙烯衍生物的合成与光学性质

合成了液晶化合物α-氰基二苯乙烯衍生物(Z)-2-(4-十二烷基氨基苯基)-3-(4-十二烷氧基苯基)丙烯腈(T3),化合物T3与其同系物(Z)-2-(4-氨基苯基)-3-(4-十二烷氧基苯基)丙烯腈(T2)的浓溶液和固体态在蓝绿光波段均有强的荧光发射。热重分析数据表明,两个化合物均有好的热稳定性。利用差式扫描量热分析和偏光显微镜研究了化合物T3的液晶性质,同时借助粉末XRD分析化合物T3的分子间排列方式,表明化合物T3形成近晶相液晶。     

高声强行波管装置

本文介绍飞机强度研究所小型高声强行波管的声学设计和消声降噪处理。     

颤振主动抑制的状态空间法

本文研究颤振主动抑制的状态空间法,首先建立了带有后缘控制面的二维翼段的数学模型;然后使用二次型性能指标求得了系统的最优控制规律。为了改善闭环系统的性能,文中提出了一种准则,给出了数值计算的例子,其结果是令人满意的。     

科普实验教学项目:地沟油-膨润土去污皂的制备及去污率测定*

本科普实验设计以地沟油和膨润土为主要原料,通过皂化反应制备地沟油-膨润土去污皂,主要包括简化地沟油纯化流程、优化皂化反应配方、美化产品,实验的观赏性和互动性强。在此基础上,通过制作科普视频、宣传手册、举办体验活动等方式,全面立体地向公众展现地沟油纯化过程、皂化现象及其背后的化学原理等。     

面向未来的化学——绿色化学

综述了绿色化学的发展背景与历史,重点介绍了绿色化学反应的基本原则以及绿色化学在原子经济、绿色原料、绿色催化剂、绿色溶剂、绿色化学产品等领域取得的进展,希望能够推动社会和民众对绿色化学的理解与认知。     

Pyridine-contained α-Cyanostilbenzene Schiff Base:Preparation,Crystal Structure and Photoluminescence

A novel pyridine-contained α-cyanostilbenzene Schiff base,(Z)-3-(4-butoxyphenyl)-2-(4-((E)-pyridin-2-yl-methyleneamino)phenyl)acrylonitrile(L), has been synthesized and characterized by 1H NMR, 13 C NMR, FT-IR spectra and single-crystal X-ray diffraction.Single-crystal data show that compound L belongs to the triclinic system, space group P1, with a =8.759(4), b = 10.779(4), c = 12.594(5) A, α = 65.873(4), β= 88.332(5), γ= 73.800(5)°, Mr= 381.46,V = 1037.2(7) A3, Z = 2, D= 1.221 g/cm-3, μ = 0.076 mm-1c, F(000) = 404, Rint = 0.0311, R(I 2σ(I)) = 0.0484, w R(I 2σ(I)) = 0.1544, R(all data) = 0.0484, w R(all data) = 0.1692,completeness to theta = 25.000 being 99.0% and GOF = 1.179. There are two kinds of intermolecular hydrogen bonds and one kind of C–H···π weak interaction between adjacent molecules. Compound L can be used as a candidate for desirable devices with high performance due to its good thermal stability and excellent optical performance.     

Synthesis,Crystal Structure,and Photoluminescence Properties of One Novel D-π-D Type α-Cyanostilbene Derivative

Researches on α-cyanostilbene derivatives demonstrated them to be promising AIE or AIEE structural molecules and potential photoelectric materials. One novel α-cyanostilbene derivative, namely(E)-2-(4-butoxyphenyl)-3-(4-(diethylamino)phenyl)acrylonitrile(BPDPA), has been designed, synthesized and characterized. The crystalline structure of BPDPA has been studied in detail. The single-crystal X-ray diffraction revealed BPDPA crystallizes in triclinic space group P1, with a = 12.860(5), b = 13.327(5), c = 15.016(5) , α= 72.650(5), β = 66.969(5),γ = 62.897(5), Mr = 696.95, V = 2085.6(13) 3, Z = 2, Dc = 1.110 g/cm-3, μ = 0.068 mm-1, F(000) = 752, Rint = 0.0264, R(I 2σ(I)) = 0.0649, wR(I 2σ(I) = 0.1724, R(all data) = 0.1321, wR(all data) = 0.2158, completeness to theta = 25.00 is 99.4% and GOF = 1.067. Like most reported α-cyanostilbene derivatives, BPDPA possesses a somewhat twisted molecular structure. UV-Vis and FL measurements showed an obviously bathochromic effect of BPDPA with increasing the polarity of the solvents.     

虚伪阻尼因子法在梁振动主动控制中的应用

本文研究了弹性梁在移动载荷作用下振动的主动控制,根据振动系统的特点提出了虚伪阻尼因子法.使用此方法可以方便求得黎卡提方程的初始迭代阵,以它进行迭代能保证计算稳定和快速收敛.文中还进一步讨论了主动控制的机理,计算了控制系统的响应,结果表明主动控制系统的响应优于被动控制.