基于系统耦合的旅游业与新型城镇化协调发展分析——以云南省为例

以云南省为例,分析了新型城镇化系统与旅游业系统之间的耦合机理,采用熵值赋权法测度了其旅游业和新型城镇化的发展水平;继而在此基础上,利用系统耦合模型和协调发展度模型度量了两个子系统之间的耦合度和耦合协调度。结果表明:1明显地出现了以昆明为中心的新型城镇化水平的3级空间等级扩散,第2圈层呈现"V"字形空间分布;2滇西北、滇中、滇南的旅游业发展水平要高于其他地区;3从各市(州)的耦合协调发展度来看,昆明为优质协调,丽江为中级协调,迪庆、西双版纳为初级协调,昭通为轻度失调,其他市(州)为勉强协调和濒临失调。     

Combined effects of water temperature and copper ion concentration on catalase activity in Crassostrea ariakensis

A central composite experimental design and response surface method were used to investigate the combined effects of water temperature(18–34℃) and copper ion concentration(0.1–1.5 mg/L) on the catalase(CAT) activity in the digestive gland of C rassostrea ariakensis. The results showed that the linear effects of temperature were significant(P 0.01), the quadratic effects of temperature were significant( P 0.05), the linear effects of copper ion concentration were not significant(P 0.05), and the quadratic effects of copper ion concentration were significant(P 0.05). Additionally, the synergistic effects of temperature and copper ion concentration were not significant(P 0.05), and the effect of temperature was greater than that of copper ion concentration. A model equation of CAT enzyme activity in the digestive gland of C. ariakensis toward the two factors of interest was established, with R 2, Adj. R 2 and Pred. R 2 values as high as 0.943 7, 0.887 3 and 0.838 5, respectively. These findings suggested that the goodness of fit to experimental data and predictive capability of the model were satisfactory, and could be practically applied for prediction under the conditions of the study. Overall, the results suggest that the simultaneous variation of temperature and copper ion concentration alters the activity of the antioxidant enzyme CAT by modulating active oxygen species metabolism, which may be utilized as a biomarker to detect the effects of copper pollution.     

Effects of salinity and body mass on oxygen consumption and ammonia excretion of mudskipper Boleophthalmus pectinirostris

We evaluated the effects of salinity andbody mass on the oxygen consumption rate and ammonia excretion rate of mudskipper Boleophthalmus pectinirostris under laboratory conditions.Salinity and body mass had highly significant effects on the oxygen consumption rate(R_O) and ammonia excretion rate(R_N)(P0.01).The interactive effects between salinity and body mass onR_O and R_N were insignificant(P0.05)and highly significant(P0.01),respectively.R_O and R_N of B.pectinirostris decreased significantly as the individual body mass increased.The relationship between R_O and body mass was represented by R_O=aW~b(R~2=0.956,P0.01).The relationship between R_N and the body mass of B.pectinirostris was represented by R_N=cW~d(R~2=0.966,P0.01).The R_O/R_N(O:N) ratios increased significantly as the salinity increased from 12 to 27,but decreased as salinity increased from 27 to 32.The atomic O:N ratios were significantly higher at27 than at other salinity levels.The average O:N ratio was 25.25.Lipid and carbohydrate were the primary energy sources and protein was the secondary energy source within the salinity range 12-32.R_O and R_N were significantly higher at 27 than at other salinity levels.Our results suggest that the optimum salinity level for B.pectinirostris is 27.     

赣北钨矿成岩成矿期次及与赣南钨矿对比分析

<正>江西是我国重要的钨矿生产基地,尤以赣南的大脉型黑钨矿著称。近年来,赣北地区钨多金属矿床取得了重要的找矿突破。其中,大湖塘和朱溪两个世界级超大型钨矿床的发现改变了江西"南钨北铜"的传统观念。本文根据赣北地区各矿区成岩成矿同位素年代学数据,确定赣北钨矿成矿期次,同     

基于高分辨率遥感数据的稀有金属矿化带勘查

以西昆仑大红柳滩地区花岗伟晶岩型稀有金属矿化带为研究对象,以World View-2高空间分辨率数据为主要信息源,在影像图制作的基础上,有针对性地进行图像增强处理,突出控矿要素和矿化信息,开展该矿种的遥感综合解译;利用ASTER数据开展与花岗伟晶岩型稀有金属成(控)矿作用相关的异常信息提取;配合适量的野外查证,分析其高分辨率遥感特征及成矿地质条件,建立遥感地质找矿模型。结果表明,利用高分辨率遥感卫星数据为主的数据源能够快速圈定找矿有利地段,满足西昆仑大红柳滩地区稀有金属矿勘查和资源评价需求,可为在相同或类似地区开展此类工作提供借鉴。     

砂土中水平矩形锚板竖向拉拔承载全域内三维统一力学模型与承载力计算方法研究

水平矩形锚板竖向拉拔属于典型的三维问题,但极限状态下锚周土体滑动面形态受锚板长宽比、埋深比两个变量共同影响,表征难度大。结合ABAQUS软件三维数值模拟和二维滑动面分析结果,三维滑动面在其埋深范围内任一水平剖面上的几何形态可用4段分别与锚板长边、短边平行且相等的直线段以及4段1/4圆弧线组成的闭合图形描述;直线段与对应锚边的水平距离由长边中心竖向对称面内的滑动面决定,该二维滑动面形态仅取决于埋深比,可使用对数螺旋线形态函数进行表征。构建出了水平矩形锚板竖向拉拔承载三维力学分析模型,分析了该模型存在的4种工况。结合模型的分解与合并开展隔离体的力学极限平衡分析,推导建立了水平矩形锚板竖向拉拔承载力计算方法,该方法可在长宽比和埋深比全域范围内使用。通过与5个试验案例,3种计算方法的对比分析表明,新方法在各种密实状态砂土地基中均表现最好,具有很好的适用性。     

青海省兴海县赛什塘铜矿床矽卡岩矿物学特征及地质意义

赛什塘铜矿位于东昆仑造山带东端的鄂拉山地区,是中国西部重要的矽卡岩型铜矿之一。矽卡岩形成于印支期石英闪长岩与中—下三叠统地层Tb2 1-2岩性段的接触带,矿体主要呈似层状、透镜状产于外接触带矽卡岩中。Tb2 1-2岩性段由中性火山岩、大理岩及变质粉砂岩构成,其中变安山质凝灰岩及安山岩与铜矿化有着密切的空间关系。岩相学研究表明,含铜矽卡岩的形成经历了矽卡岩阶段、退化蚀变阶段、石英-硫化物阶段及石英-碳酸盐阶段。矽卡岩阶段形成石榴子石、辉石及硅灰石,退化蚀变阶段则形成绿帘石、角闪石及磁铁矿,石英-硫化物阶段大量金属硫化物发生沉淀。电子探针分析表明,石榴子石与辉石矿物组分分别为Gro0.00~91.00And7.02~100.00(Pyr+Alm+Spe)0.00~4.27与Di12.80~98.08Hd2.41~79.80(Jo+Jd+Opx)0.00~13.47,表明其属于典型的钙矽卡岩类。空间上,靠近石英闪长岩与安山岩接触带处,钙铝榴石和绿帘石更富集,而向大理岩的一侧以钙铁榴石为主,并常见硅灰石及含Mn的钙铁辉石。矿物学特征及矿物成分的变化显示:从矽卡岩阶段到石英-硫化物阶段,流体性质呈幕式的变化,成矿流体至少经历了2次氧化还原性质的转变,这种变化可能与成矿流体中大气降水的不断加入有关。赛什塘铜矿属于矽卡岩型矿床,以石英闪长岩为主的岩浆活动携带了大量的热量及流体,侵入到中—下三叠统地层中,与围岩地层发生物质交换的同时,引起了大理岩、变质粉砂岩与中性火山岩之间的双交代作用,是导致矽卡岩和矿体形成的重要机制。     

中国近海海洋锋和锋面预报研究进展

海洋锋是水文要素特性不同的2个水团之间的狭窄过渡带,是一种重要的中尺度海洋现象,对渔业、军事和海洋环境保护等许多领域有重要影响,已经成为近年来物理海洋学以及海洋交叉学科中的重要课题之一。中国近海由于众多环流、水团和涡旋在此交汇,海洋锋现象十分显著,近年来,我国学者对中国近海的海洋锋产生机制和变化规律取得了一定的进展。首先从实测水文资料分析、遥感资料分析和数值模拟3个方面分别回顾了黄海、东海、南海北部等中国近海海域海洋锋的研究进展。对于海洋锋的预报研究,我国起步较晚,但目前对近海海洋锋预报的需求十分迫切。回顾总结了国外海洋锋预报的进展,集中介绍了黑潮锋、冰岛—法罗群岛锋、湾流锋和墨西哥湾锋面涡旋的预报方法和现状,最后对如何开展中国近海海洋锋预报提出思考和展望。     

辽宁省特色小镇空间结构分形及优化研究

运用聚集维数、网格维数、关联维数等地理数学方法,结合ArcGIS10.2软件研究空间结构特征及优化.研究发现:①辽宁省特色小镇空间聚集作用较强,西柳镇中心性明显,对其他特色小具有一定的吸附作用并在附近存在多分形特征;②在发展过程中特色小镇具有集中于线状区域的趋势.系统空间演化是以局部区域部分城市为节点,通过内部道路系统要素进行能量传递而形成的分形特征;③牛鸭维数β=0.9819趋近于1,表明辽宁省特色小镇之间的交通通达性较好;④加强特色小镇之间的合作、提高交通网络通达度、构建旅游空间格局对优化空间结构有重要影响.基于分形理论探寻空间结构特征及优化,为辽宁省构建特色小镇产业群提供参考.