Search

平成21年度より、宮城教育大学と仙台市天文台の連携企画の一つとして、理科実験教室「スペースラボ in 仙台市天文台」の実践を行っており、宇宙や天文に関するテーマによる2時間半の実験教室を仙台市天文台で開催した。今回は、平成21年度と22年度の2年間にわたって実施した分子のキラリティをテーマとした化学実験の実践結果について報告する。

A lot of junior high schools and high schools hope to use molecular models of DNA in life science classes. A lot of comments regarding their willingness to make a molecular model of DNA are sent to us.However, it is not easy for the student to make a complete molecular model of DNA Recently, we developed a simplified molecular model using the socket and dimple method. The model is composed of six kinds of classified balls, which symbolize adenine, thymine, cytosine, guanine, phosphate group, and deoxyribose, respectively. The students can easily study the mechanism of the reproduction of DNA by using this model.

Fullerene C_ is a soccer ball-like molecule which has 12 pentagons and 20 hexagons. All carbon atoms in this molecule take the same chemical bond style, a single 108° angle and two 120° angles, for chemical bonds. Fullerene pointer developed in this laboratory makes it possible to set the chemical bond points having the above bond angles on the surface of a carbon ball. Firstly, 12 pentagons were made using 108° angle points on a carbon ball, and then these pentagons were connected to each other using 120° angle points. During the connection of pentagons, hexagons were formed naturally and the shape of the molecular model became that of a soccer ball. Thus, anyone is able to make a molecular model of fullerene easily.

A new molecular model manufacturing method which utilized the familiar materials of toothpicks and styrene-foam balls as bonds and atoms respectively was developed. Generally, carbon, nitrogen and oxygen atoms in various organic compounds observed in organisms are situationed in the sp^2 or sp^3 hybrid orbitals. Because connection points for these hybrid orbitals are not fixed on the spherical surface of styrene-foam balls, these points need to be set up by a suitable method. A pointer applied to instrumentation technology of spherical surfaces was developed and setting of bond connection points became possible and easy. In application, this new technique makes manufacturing of any molecular model possible.

航空宇宙技術研究所 6-7 JUN. 1996 東京 日本, National Aerospace Laboratory 6-7 JUN. 1996 Tokyo Japan, 2枚の直交平板のコーナ領域における、姿勢制御システム(RCS)用窒素分子ジェットと極超音速窒素分子希薄気流の干渉の、モンテカルロ直接シミュレーションを改良型擬衝突(INC)法を用いて行った。分子モデルは、弾性衝突に対して可変性軟球(VSS)モデルを、回転非弾性衝突に対して統計的非弾性断面積(SICS)分子モデルを用いた。平板表面圧を欧州宇宙機関(ESA)から提供された実験結果と比較した。, The Monte Carlo direct simulation of the interaction of a Reaction Control System (RCS) nitrogen jet with a hypersonic rarefied nitrogen flow in the corner region of two perpendicular flat plates is performed using the Improved Null-collision (INC) technique. The molecular model is taken as the Variable Soft Sphere (VSS) model for elastic collisions and the Statistical Inelastic Cross Section (SICS) model for rotationally inelastic collisions. The plate surface pressure is compared with the experimental results provided by the European Space Agency (ESA)., 資料番号: AA0000685038, レポート番号: NAL SP-34

航空宇宙技術研究所 7-9 Jun. 1995 東京 日本, National Aerospace Laboratory 7-9 Jun. 1995 Tokyo Japan, 円柱周りの極超音速窒素希薄気体流のモンテカルロ直接シミュレーションを、最近提案した弾性および回転振動非弾性断面を用いて実行した。振動励起、衝突セル当たりの分子数、振動レベルのステップ数の切断の影響を討議した。, The Monte Carlo direct simulation of the hypersonic rarefied nitrogen flow over a circular cylinder is implemented using the recently proposed elastic and rotationally and vibrationally inelastic cross sections. The effects of the vibrational excitation, molecular number per collision cell, and truncation of the number of vibrational level step are briefly discussed., 資料番号: AA0000294019, レポート番号: NAL SP-30