Effect of Dietary Phosphorus on the Growth and Body Components of Juvenile Synechogobius hasta

The effect of dietary phosphorus on the growth and body components of juvenile Synechogobius hasta was determined. Different percentages of dietary phosphorus (0.63, 0.77, 0.93, 1.06, 1.22 and 1.36) were tested by feeding the fish (body weight, 15.81 g ± 0.32 g; 20 individuals each group; 3 groups each percentage) at a surplus of 5%–10% above satiation for 35 d. Dietary phosphorus did not significantly affect the specific growth rate, feed intake, feed conversion ratio and protein efficiency rate. Nitrogen ...     

和田玉的鉴定与评估

新疆和田玉是世界软玉品种中最好的一种,有“玉王”之称。该文对和田玉的矿物组成、化学成分及物理性质进行了鉴定分析,提出了和田玉原料及玉器的评估方法。     

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A VERTICAL DISTRIBUTION MODEL OF NUTRIENTS AND DISSOLVED OXYGEN IN THE SOUTHERN TAIWAN STRAIT

Sinoe vertical transport of nutrients and dissolved oxygen are quite important in the water col-umn and have drawn serious attention these recent years, a one-dmension numerical model is tried to simulate the vertical distribution of nutrients and dissolved oxygen in June at two research sites in the southemTaiwan Strait. Physical transport parameters are calibrated by temperature simulation, and thenare used to simulate the profiles of NO_3, PO_4 and dissolved oxygen. The simulation was generally success-ful for both stations. The importance of various factors, such as upwelling tidal current andbiogeochemical activities, which influence the vertical distribution of nutrients and dissolved oxygen, is revealed by analysis of the modeling results. Some important rates, fluxes and ratios are also estimated anddiscussed on the basis of simulation.     

局部型地形因子并行计算方法研究

 随着分析区域的扩展及需求精度的提高,数据-计算密集型地形分析亟需通过并行化来满足用户的时间响应需求。局部型地形因子是以一定半径的分析窗口(通常为3×3)计算且具有单元计算结果独立性的地形信息,是数字地形分析的基本参数。本文在分析局部型地形因子串行算法特征的基础上,以坡度算法为样本,对局部型地形因子的并行计算方法进行了深入研究。从数据并行的角度,对并行计算环境下的数据划分粒度、方式及结果融合策略进行了分析,构建了局部型地形因子的并行计算方法。利用SRTM陆地表面地形DEM数据,设计了坡度并行计算的实验以验证其方法的正确性和实用性。实验结果表明,本文提出的并行计算方法顾及了任务、数据及计算环境,可快速对局部型地形因子串行算法进行并行化改造,提高算法的执行效率,具有较好的并行性能。     

系统偏差常数弧段估计策略对多系统静态精密单点定位的影响

为探讨系统偏差最优估计策略,利用IGS提供的GPS、BDS、GLONASS和Galileo 四系统的观测数据以及GFZ提供的精密卫星钟差和精密轨道产品,将系统偏差（ISB）按照高斯白噪声、20 min、30 min、1 h、2 h分段常数进行单天静态解,分别获得E、N、U方向上的坐标偏差,分析不同系统偏差求解策略下多系统融合PPP的收敛时间和定位精度。结果表明,在多系统融合静态PPP中,从观测模型强度与定位结果稳定性和可靠性角度综合考虑,对ISB采用20 min分段常数估计策略是最优的,静态PPP收敛时间在30 min左右,收敛后的定位精度E方向优于2 cm、N方向优于1 cm、U方向优于5 cm。     

EVALUATION OF ECOLOGICAL SERVICES OF JILIN PROVINCE, NORTHEAST CHINA

1INTRODUCTIONEcosystem services can be divided into two major cat-egories, one is system function, and the other is sys-tem services and goods provision, which provide not only materials such as food and medicine, but also support and maintenance of whole system. Ecological services contribute to the whole economic system, both directly and indirectly, and consequently repre-sent parts of the total value of our economy system (COSTANZA etal., 1997; GUO etal., 2001). Sustainable d…     

Histological and Histochemical Analyses of the Cuttlebone Sac of the Golden Cuttlefish Sepia esculenta

The secretion function of mantle is closely related to shell formation in some bivalves and gastropods. Up to now, few researches have been reported for cuttlebone formation in the class Cephalopoda. In this study, the structure and secretion function of cuttlebone sac of the golden cuttlefish Sepia esculenta was analyzed using the histological and histochemical methods. The results showed that high and columnar cells located in sac epithelium, and flat cells existed near the base membrane. A lot of fibroblasts were found in the lateral mantle collective tissue. Some mucus, mucopolysaccharide and alkaline phosphatase (ALP) were found in the sac. The ultrastructural characteristics of Quasi-connective-tissue-calcium cells (QCTCC) were observed using a transmission electron microscope (TEM). The relationship between cuttlebone sac secretion function and shell formation was discussed.     

Comprehensive evaluation on urban sustainable development of Harbin City in Northeast China

It is an effective way in realizing urban coordinated and sustainable development to establish a series of indicators and to evaluate urban environmental and socioeconomic development. According to the characteristics of Harbin City in Northeast China, an indicator system including five subsystems and 37 indicators was established for comprehensive evaluation on urban sustainable development. The development indexes of all urban subsystems and complex system were calculated quantitatively using the comprehensively integrated methods composed of Principle Component Analysis, Analytic Hierarchy Process and weighed index method, and then the comprehensive level of urban sustainable development and the degree of urban interior coordination were analyzed. The results indicated that 1) the overall urban development presented an uptrend, however, the interior development was not well balanced from 1996 to 2006; 2) the development in each subsystem presented a strong fluctuation; and 3) the development in resources subsystem showed a downtrend. Based on those results, the suggestions of urban sustainable development were put forward at the end.     

基于热力图数据的杭州商业综合体活力影响因素分析

为了防止商业综合体建设过剩,形成商业综合体之间的恶性竞争。本文基于微信易出行插件里面的城市热力图数据,以杭州市5个商业综合体为例,获取可以量化的热力值数据,对不同类型的商业综合体活力影响因素进行对比分析研究。研究发现：① 城市商业综合体布局密度、周边用地用途、销售模式、内部功能布局以及内部空间活力5个要素对商业综合体活力的影响最明显;② 商业综合体的高密度布局对其活力存在抑制作用,通过对比各个服务半径内的商业综合体的活力变化,发现商业综合体合理的服务半径应该大于1.0 km。商业综合体周边的居住用地、广场和公园用地对其活力具有增强作用,办公用地对商业综合体活力的影响较弱;③ 针对不同消费对象制定的不同销售模式,也会对商业综合体活力变化产生显著影响;④ 在公共活动空间相对缺乏的区域内,以零售为主且兼具城市公共活动空间的商业综合体比以主力店为主的商业综合体的活力更高,空间利用率越高的商业综合体活力也越高,商业综合体承担部分城市公共活动空间的职能对商业综合体的活力起到了提升作用。