Analysis on Morphological Variations among Six Wild Groups of Anthocidaris crassispina from South China Sea

In order to study the morphological variations among wild Anthocidaris crassispina groups in the southeast coast of China, six groups collected from Daya Bay, Egong Bay, Hailing Island, and Nan＇ao Island in Guangzhou Province, Weizhou Island in Guangxi Province and Ningde City in Fujian Province were analyzed in this paper. Six morphometric traits were measured and the degrees of morphological variations among wild Anthocidaris crassispina groups were compared using four multivariate analyses, one-way ANOVA analysis, variation coefficient method, cluster analysis and discriminant analysis. The results of one-way ANOVA analysis showed that there were significant differences in the six morphometric traits between Weizhou Island＇s population and the other five groups. The variation coefficient analysis showed that the difference between the Weizhou Island＇s population and Hailing Is- land＇s population reached the interspecific level. The results of cluster analysis showed that the morphometric characters of Daly Bay＇s population, Egong Bay＇s population and Nan＇ao＇s population were more similar, but the groups from Weizhou Island and Ningde City were the most divergent. The discriminant analysis showed that the identification accuracy of A. crassispina was 47.8%-86%, and the total dis- criminant accuracy was 65.3%. All the analysis results above suggest that certain morphological variation has been generated among A. crassispina groups from differ- ent origins due to geographical isolation and different environmental factors.

Asymptotic analysis of outwardly propagating spherical flames

Asymptotic analysis is conducted for outwardly propagating spherical flames with large activation energy. The spherical flame structure consists of the preheat zone, reaction zone, and equilibrium zone. Analytical solutions are separately obtained in these three zones and then asymp- totically matched. In the asymptotic analysis, we derive a correlation describing the spherical flame temperature and propagation speed changing with the flame radius. This cor- relation is compared with previous results derived in the limit of infinite value of activation energy. Based on this correla- tion, the properties of spherical flame propagation are inves- tigated and the effects of Lewis number on spherical flame propagation speed and extinction stretch rate are assessed. Moreover, the accuracy and performance of different mod- els used in the spherical flame method are examined. It is found that in order to get accurate laminar flame speed and Markstein length, non-linear models should be used.

Research on the Correlation between Meteorological Factors and Flue-cured Tobacco Chemical Components in Different Altitudes of Lincang Region

In this study, the relationship between major meteorological factors and tobacco chemical components in different altitudes of Yongde County, Lincang Region of Yunnan Province was studied using correlation analysis and path analysis methods.The results showed that there was a difference on meteorological factors in different altitudes, causing different impacts on chemical components of flue-cured tobacco; contents of nicotine and total nitrogen decreased with the rising of altitude, conversely, total sugar and reducing sugar contents increased with the rising trend of altitude, and the differences on the contents of potassium （K） and chlorine（CI）, and the ratio of K to CI in different altitudes were not significant, at the altitude of 1 250-1 450 m, each chemical component indicator was better. The correlation between main meteorological factors and conventional chemical components of tobacco leaves was as follows： contents of reducing sugar and total sugar increased with the increase of rainfall and relative humidity, and decreased with the increase of sunshine duration; nicotine content increased with the increase of accumulated temperature and sunshine duration; total nitrogen （N） content increased with the increase of daily mean temperature and accumulated temperature; sugar-alkali ratio increased with the increase of rainfall. Path analysis showed that the direct effect of sunshine duration on reducing sugar and total sugar of tobacco leaves was faint, but the indirect effect was obvious; meanwhile, the direct and indirect effects of it on nicotine and total N were the greatest.

TACE治疗中晚期原发性肝癌108例生存分析

目的探讨经导管肝动脉化疗栓塞术(TACE)治疗中晚期原发性肝癌(primary liver cancer,PLC)的生存率及其影响因素。方法回顾性分析108例接受TACE治疗的中晚期PLC患者临床资料;寿命表法计算生存率,Log-rank法单因素分析预后因素,Cox比例风险模型确定独立危险因素。结果 TACE治疗后6、12、24、36、48月生存率分别为59.26%、34.41%、14.03%、10.23%、5.12%;单因素分析显示,肿瘤最大直径、门静脉癌栓及远处转移是影响生存率的重要因素,Cox比例风险回归模型分析显示肿瘤最大直径>10 cm、存在门静脉癌栓是影响生存率的独立危险因素。结论 TACE是治疗中晚期PLC的有效方法;肿瘤大小和门静脉癌栓是影响患者预后的重要因素。

Comparison between Microwave Coherent and Incoherent Scattering Models in Corn Field

[Objective] The aim was to compare and analyze microwave coherent and incoherent scattering models in a corn field. [Method] In the research, based on a coherent scattering model （Stile）, we proposed a coherent scattering model exclusive for corn, in which, physical optics （PO） and infinite-length dielectric cylinder were used to calculate single-scattering matrices of corn leaves and stalks. In addition, coherent components produced from interaction among the scattering mechanisms were also considered and this coherent model was compared with the Michigan Mi- crowave Canopy Scattering （MIMICS） model. The measured data in a corn filed in Gongzhuling in Jilin Province were used as the input parameters of the coherent and incoherent models. We simulated backscattering coefficients of VV and HH po- larization at L and C bands and made a comparison between the simulation results. [Result] The simulation results at L-band were poor, which indicated that we could not find regularity at early growth stage of vegetation. In addition, comparisons be- tween coherent and incoherent scattering models proved that the coherence triggered by the scattering mechanism was small. [Conclusion] In the research, we analyzed differences between coherent and incoherent scattering models with change of incident angle, and further analysis on the differences with change of vegetation and soil needed to be made in future.

子宫颈鳞癌中RON表达及其与预后的关系

目的:探讨子宫颈鳞癌中RON表达与临床病理指标的联系及其预后价值。方法:采用免疫组化法检测RON在子宫颈鳞癌、子宫颈上皮内瘤变及慢性宫颈炎中的表达情况及定位分布,分析其与临床病理因素的关系,同时综合临床病理资料及随访数据对子宫颈鳞癌患者进行预后分析。结果:RON蛋白在正常宫颈组织、CIN、宫颈鳞癌组织中的高表达率分别为10%、37.5%、69.6%。宫颈鳞癌组织中RON蛋白高表达与FIGO分期、淋巴结转移有关(P<0.05),而与患者年龄及肿瘤的分化程度无关(P>0.05)。Kaplan-Meier法进行单因素生存分析,RON蛋白表达阳性患者及阴性患者的无瘤生存期分别为(23.27±2.10)月、(37.33±2.30)月;Log-rank检验结果显示,两组患者的无瘤生存期比较,差异有统计学意义(χ2=13.510,P<0.001)。结论:RON蛋白在宫颈癌的发生、发展、临床分期与淋巴结转移中发挥了重要作用,有望成为预测宫颈癌病情进展的一个潜在的分子标记物。

VON NEUMANN STABILITY ANALYSIS OF SYMPLECTIC INTEGRATORS APPLIED TO HAMILTONIAN PDEs

Discusses the symplectic integration of separable Hamiltonian ordinary and partial differential equations (PDE). Results of a von Neumann analysis; Spectra of linearized Hamiltonian PDEs.