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.

中国东部盆地油气藏同生断层的定量研究

在中国东部松辽、渤海湾和三水盆地,其中、新生界砂泥岩沉积地层广泛地发育着因重力滑塌作用而形成的同生正断层。用断层两盘同层位地层厚度的比值,不仅可以定量研究断层的发育,揭示断层本身的特征和规律性,而且还对与断层相关油气藏的形成条件,即油气运移、聚集和保存条件起控制作用。文中以上述三个盆地的油气藏为例,论述了同生断层的定量研究方法及其在相关油气藏形成过程中的地质作用。

山东道地药材丹参脂溶性成分指纹图谱及多指标成分同时定量研究

目的：建立山东道地药材丹参脂溶性成分指纹图谱，并对其三种脂溶性成分同时进行含量测定。方法：Sciences—InertSustainC．8色谱柱；乙腈-0．02％磷酸溶液梯度洗脱；流速1．0mL／min；温度30℃。结果：10批次丹参指纹图谱标定20个共有峰，相似度均≥0．940；丹参酮Ⅰ、丹参酮ⅡA、隐丹参酮在0．11～2．2、0．0521．04和0．043～0．086μg之间呈良好的线性关系。结论：所建立的方法可靠、结果稳定，为丹参药材的质量评价提供参考依据。

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.

我国近五年来注意偏向研究的文献计量分析

目的:了解我国近五年注意偏向研究的文献状况。方法:采用"注意偏向"为检索词,对中文期刊全文数据库(CNKI)中收录的关于注意偏向研究的相关文献进行了较为系统全面的文献计量分析。结果:注意偏向研究的文献逐年增长;研究注意偏向的学科主要是心理学(64.29%);期刊的类型中,最主要的期刊是中国临床心理学杂志(11.43%);研究机构以西南大学为首(14.29%)。结论:注意偏向已引起社会广泛关注,但目前对注意偏向的研究主要集中在高校,且各大高校分布不均衡。

牛奶蛋白纤维与再生纤维素纤维混合物的定量化学分析研究

文章通过研究牛奶蛋白改性聚丙烯腈纤维和再生纤维素纤维的结构特点,以及在37%盐酸中的溶解性能,探索出一种牛奶蛋白改性聚丙烯腈纤维和再生纤维素纤维混合物化学定量分析的新方法—37%盐酸法。

近红外光谱法快速测定天花粉药材水分

目的利用近红外漫反射技术和化学计量学的方法对天花粉药材的水分进行快速定量分析。方法用积分球漫反射测定样品的近红外漫反射光谱,定量模型的预处理方法为多元散射校正(MSC)和一阶微分处理,波长范围为5 855~5 760 cm^(-1)、5 200~4 832 cm^(-1)和4 512~4 292 cm^(-1),回归方法为偏最小二乘法(PLS)。结果定量模型的最佳主因子数为6,内部交叉验证均方差RMSECV为0.442,决定系数R2为0.9964,外部验证预测均方差(RMSEP)为0.364,系统精密度RSD为1.3%,方法精密度RSD为2.2%。结论建立预测模型对天花粉药材的水分进行测定时可行的,该法分析快速简便,结果准确。

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.

特征图谱、一测多评与模式识别相结合的茵陈【茵陈蒿(绵茵陈)】配方颗粒质量评价分析

目的:建立特征图谱、一测多评和化学模式识别分析相结合的茵陈【茵陈蒿(绵茵陈)】配方颗粒质量评价方法。方法:利用制备的15批茵陈【茵陈蒿(绵茵陈)】标准汤剂和3批配方颗粒建立了HPLC特征图谱,并对其中6个主要成分建立一测多评法进行含量测定。采用AcclaimTMRSLC 120 C18(100 mm×2.1 mm,2.2μm)色谱柱,以乙腈-0.05%磷酸水溶液为流动相,梯度洗脱,流速0.4 mL·min^(-1),检测波长327 nm。进行相似度评价、聚类分析(HCA)及主成分分析(PCA)。计算指标成分从饮片到标准汤剂及配方颗粒的转移率。结果:15批茵陈【茵陈蒿(绵茵陈)】标准汤剂和3批配方颗粒特征图谱相似度>0.85,共确定了8个共有峰。HCA、PCA的分析结果显示茵陈【茵陈蒿(绵茵陈)】配方颗粒与标准汤剂成分一致性较好。15批茵陈【茵陈蒿(绵茵陈)】标准汤剂中新绿原酸、绿原酸、隐绿原酸、异绿原酸B、异绿原酸A、异绿原酸C含量分别为1.87~5.23、7.44~15.26、2.85~8.18、3.05~6.14、0.99~3.93、3.23~10.38 mg·g^(-1),饮片到标准汤剂的转移率分别为23.85%~37.28%、19.57%~31.93%、28.15%~45.88%、22.34%~36.59%、16.64%~28.36%、21.81%~39.19%。茵陈【茵陈蒿(绵茵陈)】配方颗粒指标成分含量、转移率与标准汤剂接近。结论:所建立所建指纹图谱及一测多评分析方法可用于茵陈【茵陈蒿(绵茵陈)】配方颗粒的质量评价及工艺研究。

邻苯二甲酸酯类标准物质核磁共振定量方法的建立

目的:建立以核磁共振定量法(简称qNMR法)测定邻苯二甲酸酯标准物质含量。方法:仪器为配备5 mm BBO探头的Bruker Ascend 500 MHz核磁共振仪,采集一维定量氢谱,90°脉冲,延迟时间的d1为20 s,温度为25℃,采样次数为128次。以富马酸为内标,对12种邻苯二甲酸酯类标准物质进行定量研究。结果:12种邻苯二甲酸酯标准物质qNMR法测定结果与对照品标定的质量平衡法定值结果基本一致。结论:采用qNMR法研究建立邻苯二甲酸酯标准物质含量测定方法,方法快捷、准确,是对标准物质量值定量测定的一种良好的补充。

基于SE-DEA模型的城乡居民收入差距影响因素研究:以大连市为例

以城乡居民收入相对差距为研究对象,针对大连市城市化进程中的具体情况,分析了影响这一指标的主要因素,应用SE-DEA模型具体比较了2001年至2011年间各个影响因素对大连市城乡居民收入相对差距的作用特点,计算结果表明,社会保障、财政支农及教育投入等制度安排的改进能够影响大连市城乡居民收入差距但效果不能尽如人意.最后提出了若干对策与建议.