The experimental studies on the carbon and nitrogen budgets of Pseudeuphausia sinica

Abstract-The carbon and nitrogen budgets were estimated on the adult females, juveniles and post-furcilia larvae of Pseudeuphausia sinica fed on newly hatching nauplii of Artemia salina in the laborato-ry. It was found that the ingestion rate was linearly related to the food concentration, suggesting highfeeding potential. The linear correlation could be established between the respirating rate (carbon con-sumption rate) and carbon ingestion rate, as well as carbon assimilation rate. The regression coefficients(i.e.specific dynamic action coefficients) were in the range from 9% to 16% (ingested C) or 10% to17% (assimilated C) respectively, with lower in the post-furcilia larvae. There also existed a linearcorrelation equation between estimated total nitrogen excretion rate and the rates of nitrogen ingestionand assimilation separately, except for the juveniles. The defecation rates increased with the increase ofthe ingestion rate; as a result, assimilation efficiency was not related to the ingestion rat     

利用波浪折绕射模型和风浪成长公式计算临港重现期波要素

本文通过波浪折绕射模型和浅水风浪成长公式的联合计算得到了杭州湾北岸海域的不同方向、不同重现期和不同水位条件下的波浪场分布,结果表明该海域以东向浪为主。描述了50年一遇、不同方向、不同水位条件下的波浪特征。     

Verification of A Numerical Harbour Wave Model

A numerical model for wave propagation in a harbour is verified by use of physical models.The extended time-dependent mild slope equation is employed as the governing equation,and the model is solved by use of ADI method containing the relaxation factor.Firstly,the reflection coefficient of waves in front of rubble-mound breakwaters under oblique incident waves is determined through physical model tests,and it is regarded as the basis for simulating partial reflection boundaries of the numerical model.Then model tests on refraction,diffraction and reflection of waves in a harbour are performed to measure wave height distribution.Comparative results between physical and numerical model tests show that the present numerical model can satisfactorily simulate the propagation of regular and irregular waves in a harbour with complex topography and boundary conditions.     

网络视角下旅游产业集群差异及成因——基于多案例的比较研究

旅游产业集群具有网络属性,从网络角度研究产业集群已成为当前研究的趋势。但学术界大部分关于旅游产业集群的研究都是移植产业集群的理论成果,鲜有比较视野下的旅游产业集群差异及其成因分析。从旅游产业集群的网络化特征出发,以产业组织理论的SCP范式为分析框架,选择平遥古城旅游产业集群、剑门蜀道旅游产业集群、黄陂乡村旅游产业集群、杭州西湖国际旅游综合体4个典型案例为研究对象,运用分析归纳法得出不同类型旅游产业集群的网络结构、网络行为和网络绩效间的关系和差异,并解释了造成集群绩效差异的原因。     

西昆仑北缘库斯拉甫一带中元古代岩浆活动及地质意义

西昆仑北缘库斯拉甫一带侵入前寒武纪结晶基底(Ch)的中元古代两期岩体,早期以喀特列克岩体为代表,年龄为1 567 Ma,晚期以阿孜巴勒迪尔岩体为代表,年龄为1 423 Ma。早期岩体(δoPt)具有贫硅、高钙、中碱和准铝质等特征; 岩性主要为钙碱性石英闪长岩,岩石稀土总量为168.4×10^-6～374.38×10^-6、轻重稀土比值为9.3～18.23,中等负铕异常(δEu=0.53～0.82)。晚期岩体(ηγPt)具有富硅、高碱、富钾、强过铝质和全铁含量高等特征; 岩性主要为碱性二长花岗岩,岩石具高的10⁴*Ga/Al比值(3.01～3.5),很高的REE含量(375.68×10^-6～1 075.46×10^-6),高LREE/HREE(7.07～16.87)和高(La_N/Yb_N)(8.32～25.2)及强烈负Eu异常(δEu=0.25～0.31)。通过对两期岩体(δoPt和ηγPt)同位素年龄、矿物学、岩石化学、微量元素及稀土元素等特征系统地研究,认为西昆仑北缘在中元古代发生两次明显的岩浆-构造事件,早期事件(δoPt的侵位)与兴地运动(Ⅰ幕)有关; 晚期事件(ηγPt的侵位)在时间及区域上与兴地运动(Ⅱ幕)比较吻合; 早期岩浆(δoPt)可能存在部分幔源物质的加入,显示Ⅰ型花岗岩的特征,可能属于造山期后花岗岩类; 晚期岩浆(ηγPt)可能经历过下地壳的部分熔融或较高程度的分异演化过程,属于A2型花岗岩的范畴。两期岩浆活动可能为古塔里木板块的固结-裂解提供了新的证据及裂解模式的补充。     

尚义葛令夭高铬花岗岩(Closepet-like)——新太古代古缝合带的新证据

在华北克拉通北部,太古代麻粒岩古陆核与陆外沉积盆地(红旗营子群)之间已经厘定出一个晚太古代的古洋壳残片(Wang et al., 2009)。此残片南北两侧又发现了低Al₂O₃ 型TTG岩体(2512±19Ma)、富钾高铬的深熔花岗岩(Closepet-like),含Cr 97×10^-6~308×10^-6,以及含大量密集的煌斑岩脉的含石英的二长岩(Sanukitoid-like)等三类在成因上与俯冲带密切相关的岩体。低Al₂O₃型TTG是在角闪麻粒岩亚相条件下由俯冲中的滑片部分熔融所生成。深熔花岗岩是TTG再熔融的产物,而它们的基性化演化和Cr的增高是幔源岩浆与富钾深熔花岗岩经复杂的岩浆混合和交代改造的结果。     

Paleoenvironmental reconstruction of central-western Argentina from analysis of Late-Pleistocene mammal droppings

Plant macrofossils studied in coprolites from small-sized, medium-sized and large mammals, dated by ¹⁴C to ca. 30.8–24 and 9 kybp, allowed to record changes in local vegetation and its relation with geomorphological units. Paleobotanical samples were determined using microhistological analysis. We found that plant associations and the vegetation–geomorphology relation were similar in the two periods analyzed. According to this study, the Monte plant formation would reflect certain stability during the analyzed period in arid central-western Argentina, although this does not imply the absence of variations in plant structure.     

中国西部古亚洲与特提斯两大构造域划分问题讨论

构造域是岩石圈划分中最大一级构造分区,一般将大洋岩石圈及与相邻大陆相互作用的构造带归为同一构造域,其实质是强调以大洋岩石圈为主导动力源.在梳理青藏高原北部造山带、天山-兴蒙造山带数十条蛇绿构造混杂岩带时代、性质的基础上,结合古生代古地理编图研究成果,提出中华古陆(地)块群在古生代时期为介于古亚洲洋和特提斯洋间的陆链.现今的天山-兴蒙造山带是古亚洲洋与不同性质陆块相互作用的结果,属古亚洲构造域组成部分,秦、祁、昆造山带是特提斯洋与中华古陆(地)块群相互作用结果,属特提斯构造域有机组成部分.     

中国新石器时代古玉溯源及其成矿地质条件分析

根据中国新石器时代考古发掘出土玉器的分布范围,针对相关区域的地质构造特征及软玉矿床的成矿地质条件,进行了分区成矿预测。借此,对我国新石器时代古玉的来源做了探索。