Synthesis of New Conjugated Diynes Containing Carbamate Groups, and Study of Their Properties

Carbamates of monoacetylene and diacetylene series were synthesized and characterized. A catalytic system CuI-pyrrolidine was applied for the first time to a synthesis of symmetrical diacetylenes by oxidative dimerization of terminal acetylenes. The comparative activity of diynes obtained was studied in the photoinitiated solid-phase topochemical polymerization. Diyne carbamates undergoing thermal polymerization were obtained for the first time.     

Conformational behaviour of 3-phenyl- and 3-carbomethoxy-substituted cyclopropene derivatives

According to MNDO calculated heats of formation for various 3-substituted cyclopropenes the π-acceptor methoxycarbonyl as well as the π-donor group phenyl both prefer a non-bisected orientation with respect to the three-membered ring. Temperature dependent NMR chemical shifts seem to confirm this behaviour for the free molecules. In the crystalline state, however, 1,2,3-triphenylcyclopropene (3e) and 3-isopropyl-1,2,3-triphenylcyclopropene (3f) both adopt a conformation with a bisected orientation of the 3-phenyl groups.     

Increase of polymeric chain conjugation length in UV irradiated monolayer of hydroxyalkadiynyl N-arylcarbamate derivative

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Variations in the parameters of scattered signals and the ionosphere connected with plasma modification by high-power radio waves

We describe the results of using the incoherent scatter technique to observe time-altitude variations in regular parameters of the ionospheric plasma and wave disturbances, which accompanied periodic modification of the near-Earth plasma by radio waves emitted by the “Sura” facility. A distinctive feature of the experiments was that the processes in the ionosphere were diagnosed at a distance of about 1000 km from the facility. It was found that the spectrum composition of wave disturbances in the electron density was changing noticeably during the active experiment. Quasi-periodic processes in the ionosphere were observed with a delay of about 40–60 min. The relative amplitude of wave disturbances was equal to 0.02–0.10, and the periods were equal to 30, 60, 120, and 150–180 min. The observed effect can be explained by the generation and/or amplification of traveling ionospheric disturbances. The results of theoretical estimations agree well with the observational data.     

钕玻璃的光泵感应热畸变

本文对钕玻璃的光泵感应热畸变作了理论分析,给出了光泵感应热畸变与钕玻璃热光性质的关系,并对高重复率脉冲器件和单次脉冲器件作了热畸变的定量测量,实验结果在一定程度上与理论分析相符。     

微量量热法研究温度对两种石油菌生长的影响

本文采用微量量热法测定了两种石油菌在不同温度下的生长热谱图. 按限制性条件下微生物生长模型 ,用三点法进行了数学处理, 得出了生长速率常数(k) ; 计算机拟合 k-T 非线性方程,得到了石油菌 I,II的最佳生长温度( To pt)分别为 322. 07K 和 322. 85K. 按阿仑尼乌斯公式和过渡态理论计算得到有关热动力学函数, 并根据所得结果对两种石油菌的生长代谢过程进行了热动力学分析.