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.

中国三大海洋经济圈海洋经济韧性的差异与成因

以2011—2020年十年间三大海洋区域为研究单元,通过时空比较分析法对各研究单元的海洋经济韧性指数和变化趋势进行分析。结果显示十年间海洋经济韧性指数总体波动不大,前期保持平稳,中后期表现为先降后升。在空间上长三角地区韧性指数综合最高,说明其海洋经济发展较为成熟。

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.

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.

职业培训机构与高职院校就业模式差异性研究

作为高等教育的一部分,高职院校面临严峻的就业形势。而同样具有职业教育性质的职业培训机构,其就业市场却保持着良好的发展态势。通过考察研究和就业模式的对比分析,职业培训机构与高职院校在就业能力培养、就业渠道拓展、就业机构设置、就业指导服务等方面均存在着差异。在对比分析的基础上,提出了优化高职院校就业模式的思考和对策。

企业家资本对新创企业绩效的影响——基于模糊集定性比较分析与必要条件分析方法

企业家资本是影响新创企业绩效的重要因素。为探究企业家资本不同形式及其协同作用与高水平新创企业绩效之间的关系,以115家新创企业为样本,采用模糊集定性比较分析(fsQCA)与必要条件分析(NCA)相结合的方法分析企业家资本不同形式及其组态对新创企业绩效的影响。研究表明,影响新创企业绩效的企业家资本条件具有“多重并发”“殊途同归”的特点,单一形式的企业家资本不能构成高水平新创企业绩效的必要条件或充分条件;存在两种引致高水平新创企业绩效的企业家资本组态,分别是企业家经济资本协同型组态、企业家心理资本协同型组态,且企业家经济资本与企业家心理资本之间存在一定的替代关系;存在两种引致非高水平新创企业绩效的企业家资本组态,一种是企业家人力资本、社会资本、心理资本均缺乏的组态,另一种是企业家经济资本水平高,但人力资本、心理资本匮乏的组态;企业家资本组态与新创企业绩效具有因果非对称性,引致高水平新创企业绩效条件组态的反面并非引致非高水平新创企业绩效的充分条件组态。为实现高水平新创企业绩效,企业家应根据自身资本状况,有针对性地积累不同形式的资本,而非仅重视某一种形式资本的积累;充分重视企业家人力资本、心理资本等内在资本,根据自身情况选择合适的发展路径;多学习借鉴创业企业成功经验,探寻高水平新创企业绩效之源,而非仅重视对失败经验的总结。

河南男排在2011-2012全国联赛中与前四强球队的比较

本文以2011-2012全国男排联赛中,河南男排和前四名的球队作为研究对象。从球队队员的身体条件、得分能力和防守能力等方面,对河南队和前四名的球队进行了比较研究,发现河南男排在身体条件上与前四强的球队统计学上无显著性差异。技术统计显示,河南队在得分能力和防守上和前四强的球队有一定差距,在此基础上提出相关建议。

余吾煤业3~#煤层瓦斯解吸扩散规律研究

通过对S1206、S5202工作面煤样吸附解吸实验,进行吸附解吸实验数据处理,进而求解不同工作面煤样瓦斯吸附常数值,对比分析不同煤样吸附解吸的差别,得出余吾煤业3~#煤层的瓦斯解吸扩散规律,这为对加快余吾煤业安全掘进速度、高效开采提供了重要的参考意义。

滇南少数民族地区初中生身体素质调查与比较分析——以红河哈尼族彝族自治州蒙自市某两所初中为例

为了解滇南少数民族地区初中生身体素质的发展情况,采用指标测试法(测试指标包括50米跑、立定跳远、引体向上(男)、仰卧起坐(女)、800米跑(女)、1000米跑(男)及坐位体前屈)和数理统计法对滇南少数民族地区中学生身体素质进行研究。研究结果发现:(1)除了初一、初二女生,各年级男女生的速度素质都优于合格标准(P<0.01);(2)男生上肢力量均低于或刚刚达到合格标准(P>0.01);女生腰腹力量初一女生低于合格标准,初二和初三优于合格标准(P<0.01);下肢力量,初三男女生均低于或刚达到合格标准(P>0.01),其它年级男女生优于优于合格标准);(3)各年级男女生的耐力素质、柔韧素质都显著优于合格标准(P<0.01)。此外,从城市班和农村班的比较来看,除女生速度素质和腰腹力量方面,农村班学生均优于城市班学生,但差异不显著(P>0.01)。

蒿甲醚注射液无菌检查方法的适用性试验比较

目的:拟定一个更适用于蒿甲醚注射液的无菌检查方法,以更好地控制其质量。方法:分别采用直接接种法和薄膜过滤法对蒿甲醚注射液进行无菌检查,并对两种方法的试验过程和结果进行比较。结果:直接接种法中,含蒿甲醚注射液的试验组各试管中金黄色葡萄球菌、枯草芽孢杆菌、生孢梭菌24 h均生长良好,大肠埃希菌、黑曲霉、白色念珠菌48 h均生长良好;薄膜过滤法中,含蒿甲醚注射液的试验组各滤瓶中金黄色葡萄球菌24 h均生长良好,其他5个菌在48 h均生长良好。表明该供试品在薄膜过滤法的试验量及检验条件下无抑菌作用或其抑菌作用可以忽略不计,可选择薄膜过滤法作为蒿甲醚注射液的无菌检查方法。结论:两种方法的方法适用性试验阳性菌均生长良好。但由于薄膜过滤法在操作和结果的准确性等方面有较为明显的优势,因此建议蒿甲醚注射液的无菌检查法按薄膜过滤法进行。

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.

营商环境生态、全要素生产率与城市高质量发展的多元模式——基于复杂系统观的组态分析

优化城市营商环境,促进全要素生产率是实现经济高质量发展的重要抓手。如何优化营商环境促进全要素生产率是有待回答的重要管理问题。鉴于营商环境是一种复杂生态,本文基于复杂系统观,结合QCA、NCA和DEA方法,从组态视角分析了我国城市营商环境生态与全要素生产率的复杂关系。研究发现:(1)单个营商环境要素并非是高全要素生产率的必要条件,但是优化市场环境和提升人力资源水平对城市高全要素生产率发挥着普适的作用。说明通过发挥市场机制和人力资本知识溢出效应,优化营商环境建立统一大市场,有助于促进城市高质量发展。(2)3类营商环境生态可以产生城市高全要素生产率,包括技术效率型市场驱动、渐进创新型市场驱动、政府轻推的突破创新型市场驱动,呈现出我国城市高质量发展的多元路径和复杂机制。特别是在法治环境等比较健全的营商环境下,政府与市场的共生关系表现为政府以“轻推之手”有效地激发市场主体活力,产生创新驱动的高质量发展。此外,本文发现了2类营商环境生态会导致非高全要素生产率,一是营商环境生态中各要素均表现不佳,二是在市场环境和市场活力不足的环境下,即使政府加大公共服务和支出,“重手”推动经济,也不能实现城市高质量发展。本文研究发现对中国城市优化营商环境,实现统一大市场下城市高质量发展的多元模式具有重要的理论与实践启示。