Carbon isotopic composition and genetic types of natural gas in the Sichuan Basin, China

The origin and genetic types of natural gas in the Sichuan Basin are still disputed.To classify the origin and genetic types in different areas,the paper analyzes the carbon isotopic composition of gases and geologic features in the Sichuan Basin.The results showed that the gas sourced from terrestrial layers is typically characterized by terrestrial origin and was mainly accumulated nearby to form reservoir.The carbon isotopic composition of gas showed a normal combination sequence distribution,suggesting that natural gas in continental strata is not affected by secondary alteration or that this deformation is very weak.The gas source is singular,and only gas from the southern and northern Sichuan Basin shows the characteristic of mixed sources.However,marine gas presents the characteristics of an oil-formed gas.The carbon isotopic composition of natural gas in the western and central part of the basin mostly distributes in a normal combination sequence,and few of them showed an inversion,indicating that the gas perhaps had not experienced secondary alteration.The carbon isotopic composition of marine-origin gas in the southern,northern and eastern Sichuan Basin displays a completely different distribution pattern,which is probably caused by different mixing ratio of gas with multi-source and multi-period.

HYPERBRANCHED AROMATIC POLYMERS OBTAINED VIA SELF-CONDENSATION

Hyperbranched aromatic polymers were prepared by Friedel-Crafts reaction with Lewis acid, AlCl3 and ZnCl2, as the catalysts. In this work, hyperbranched polybenzyl (PB) and poly(methylene)naphthalene (PN) were synthesized and characterized by H-1-NMR and GPC. In addition, their florescence properties were measured with steady-state florescence spectra in THF and ethylene dichloride. The quantum yields of polybenzyl and poly(methylene)naphthalene in ethylene dichloride are much larger than those in THE.

Acupuncture for 14 cases of Meige’s syndrome Ⅱ

Objective:To observe the clinical efficacy of acupuncture for Meige’s syndrome Ⅱ.Methods:Fourteen patients of Meige’s syndrome Ⅱ were treated with acupuncture.The acupoints included bilateral Tāichōng(太冲LR3),Sānyīnjiāo(三阴交SP6),Tāixī(太溪KI3),dance tremor control area of scalp acupuncture(舞蹈震颤控制区),Yángbái(阳白GB14),Sīzhúkōng(丝竹空TE23),Yíngxiāng(迎香LI20),Dìcāng(地仓ST4),Jiāchē(颊车ST6) and Xiàguān(下关ST7),and the needle retention continued for 40 min.The treatment was applied once a day,and there was a 5-day treatment and a 2-day rest every week.One course of treatment included a week,and there were 4 courses of treatment in total.After treatment,the clinical efficacy of the patients was evaluated.Results:4 cases were cured,9 cases were effective,1 case was ineffective,and the effective rate was 92.9%.Conclusions:Acupuncture had a satisfactory clinical therapeutic effect on patients of Meige’s syndrome Ⅱ.

Temperature-triggered phase transition in pyridazine hexafluorophosphate

The pyndazine hexafluorophosphate[C4H5N2]~＋[PF6]^-（1） undergoes a reversible phase transition around140 K,which was confirmed by the DSC measurement.Variable-temperature crystal structures determined at 293 K and 93 K show that the compound crystallizes in the same space group P21/c,indicating that 1 undergoes an iso-structural phase transition.As the temperature decreases,dielectric measurement of the title compound shows no significant change around the phase transition temperature.Classic hydrogen bonds are found between molecules at 293 K and 93 l〈 with similar packing arrangement.The most distinct difference between the low temperature and room temperature structures is the order-disorder transition of the hexafluorophosphate anion,which is probably the driving force of the phase transition.