PPT文件中的动画制作及在教学中的应用

介绍了利用PowerPoint软件的自定义动画中的"进入"、"强调"、"退出"、"动作路径"四类效果,制作教学中常用的化学结构式、图表、原理图、选择题等的动画制作的方法,以及常用图表的讲解、重点内容的强调、利用现有矢量性质剪帖画改制成自己所需图画的简易方法.PPT文件制作动画,操作简单,避免了超链接的麻烦,形成的文件小,便于拷贝,可制作出具有Flash效果的漂亮、生动的动画,丰富了教学内容、提升了教学效果.     

Effect of high pressure on rearrangement of organosilicon peroxides

Conclusions The thermal rearrangement of organosilicon peroxides to alkoxysiloxanes proceeds with a substantial decrease in the volume activation effect.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 484–485, February, 1978.     

Synthesis and structure—activity relationships of cyclopropane-containing analogs of pharmacologically active compounds

The review summarizes information on cyclopropane as an independent pharmacophore group and as a fragment for modification of pharmacological activity level of medicines used in practice. The advantages of a cyclopropane fragment over its bioisosteres are that, on the one hand, this fragment imposes conformational rigidity on the molecules of physiologically active compounds and, on the other hand, the replacement of acyclic terminal and “linker” groups with a cyclopropane fragment increases the metabolic stability of the target structures and extends the scope of their therapeutic action.     

Composites obtained via matrix and pseudo-matrix processes (polymerization and new phase formation)

A variety of composites comprising complexes between macromolecules and growing species such as macromolecules or particles may be prepared using matrix or pseudo-matrix processes. Matrix polycondensation of silica acid in the presence of poly(ethylene glycol) and other polymers in benzene resulting in formation of interpolymer complex (IPC) poly(silica acid)-matrix or composites including the IPC is regarded as an example of matrix processes providing the possibility to synthesize an IPC or composite which cannot be (or hardly may be) obtained by other ways: Theoretical aspects of pseudo-matrix processes in which pseudo-matrix macromolecule recognizes (i.e., forms a complex with) a particle of forming new phase and terminates its subsequent growth are discussed. Experimental data dealing with reduction of Ni(II) in polymer solutions and formation of nano-composites ‘polymer - metallic nickel’ including small particles (3–5 nm in diameter) with narrow size distribution are presented.     

The electret properties of tetrafluoroethylene-hexafluoropropylene copolymer films modified in glow discharge

The electret properties of tetrafluoroethylene-hexafluoropropylene copolymer films modified in direct-current discharge were studied. It was shown that the treatment of the films mounted on the anode had an insignificant effect on the relaxation of negative homocharge despite substantial changes in the chemistry of the surface. However, the low-temperature relaxation process responsible for the instability of the electret state in the untreated film is completely suppressed in the case of decay of positive homocharge. Deep traps associated with high-temperature relaxation processes in the polymer are simultaneously eliminated from the spectrum of surface states.     

Change in the surface properties of poly(vinylidene fluoride) films by treatment in direct-current discharge

It has been found that treatment in dc discharge results in a substantial and time-invariant increase in the surface energy of poly(vinylidene fluoride) films. This effect is obviously due to the formation of oxygen-containing groups on the polymer surface, a fact that is corroborated by Fourier-transform IR spectroscopy and X-ray photoelectron spectroscopy data. It has been shown that dc discharge is more effective in altering the contact properties of the polymer surface than low-frequency glow discharge.     

Influence of meta-extended rigid-core,complementary hydrogen bonding and flexible chain on polymorphism in Schiff-base liquid crystals: (4)MeOBD(3)AmBA:nOBAs

ABSTRACT

Schiff-base complementary hydrogen-bonded liquid crystals (HBLC), viz., (4)_MeOBD(3)_AmBA:nOBAs with flexible chain length for n = 3,4,5,6,7,8,9,10,11 and 12 are reported. ¹H; ¹³C-NMR and Infra-Red spectroscopy used to confirm the formation of HBLCs. LC phases and transition temperatures (T_c) determined by polarised optical microscopy (POM) and differential scanning calorimetry (DSC). T_c and enthalpy (?H) determined by DSC also. Odd-Even effect observed at clearing and melting transitions. Influence of Schiff base and Oxygen as bridging atom promote smectic phase abundance. HBLCs exhibit tetra- or penta-phase variance. Maximum (penta) phase variance is exhibited by n = 8 and 12 with long flexible chain. Prevalent abundance of quasi-two-dimensional (2D) LC phases of SmF and SmI is observed. Nematic phase is quenched. Lower (n = 4) and intermediate (n = 6) members exhibited SmB_cryst phase. Predominant occurrence of enantiotropic LC phases is noticed. All members exhibited 3D tilted SmG phase. A-C transition exhibited by intermediate homologues (for n = 7, 8, 9 and 10) is found to be either second order or with very small enthalpy. Phase diagram reveals the abundance of multi-critical points with LC phasesinvolving exotic symmetries. Influence of meta-extended rigid core, complementary HB and flexibility is studied for the LC phase abundance with characteristic structural order. POM and DSC results are discussed in the wake of reports in other achiral calamitic LCs.     

Alteration in the surface properties of direct-current discharge-treated tetrafluoroethylene-vinylidene fluoride copolymer films

A change in the contact properties of the surface of tetrafluoroethylene-vinylidene fluoride copolymer films by a dc discharge treatment has been studied, depending on the treatment time and the discharge current. It has been shown that the treatment of the films at the anode and cathode leads to a significant decrease in the contact angle and an increase in the total surface energy and its polar term. The change in the contact properties of the plasma-modified films during storage and heating has been studied as well. The experiments have shown that the formation of polyconjugated structures and crosslinking of macromolecules take place in the film surface layer during long-term treatment at the anode (>60 s, 50 mA), processes that result in an acetone-insoluble layer. The composition and surface structure of the films have been examined by Fourier-transform IR spectroscopy and X-ray photoelectron spectroscopy. The formation of new oxygen-containing groups and double bonds on the polymer surface and crosslinking of macromolecules in the case of anode treatment have been revealed. It has been found experimentally that the discharge treatment increases the peel strength in the Scotch® 810/copolymer film system.