基态修正的GIS数据库增量更新建模

为了对GIS数据库增量更新中的增量信息、版本数据库进行组织和管理,本文采用基态修正模型,将版本数据作为基态、版本数据对应的增量信息作为修正,分别设计了其存储的数据结构,并给出了基于该模型的增量更新流程。以1∶2000地形图数据的增量更新为例,开发了空间数据库增量更新原型系统,实现了多个增量信息文件的组织存储、快速集成到历史数据中,能够满足GIS数据库增量更新的需求。     

城市道路交通状态信息服务系统设计与实现

通过对交通信息服务系统的现状分析,本文提出了基于浮动车数据的城市道路交通状态信息服务系统设计方案,阐述了系统的交通工程理论和系统技术基本原理,结合需求分析设计了系统的功能结构,重点研究了一种高效的数据存储管理设计方法,最后结合目前流行的富客户端技术研究了系统实现问题,提出了未来的发展趋势。     

Restructuring and socially managed flexibility in the Norwegian hotel industry

The article explores processes of restructuring firms in the Norwegian hotel industry in the light of constant negotiations between neoliberalisation and countermeasures in the social-democratic welfare state, and the effects of this restructuring on labour. Inspired by scholarship on neoliberal restructuring, the article examines how competitive strategies in the hotel industry are shaped by intensified competition, by the interface of industry regulations, labour market regulations, and social security, and by the labour movement. Social-democratic welfare states are not insulated from neoliberal currents in either accumulation or regulation, and the concept of socially managed flexibility proves helpful in examining regulatory resistance to neoliberalisation. As in other advanced economies, the Norwegian hotel industry faces increased competition through intensification of labour efforts and strategies to increase flexibility, especially numerical flexibility aimed at cutting costs. Norwegian labour market regulations to some extent curb numerical flexibility for cost-cutting purposes, and the centralised labour movement plays an important role in this regard. Nonetheless, the hotel industry has found room to manoeuvre. The article reveals the state's difficulties in managing flexibility in a way that permits numerical flexibility, yet prevents cost-cutting that leads to intensified labour efforts at the lower end of the service sector.     

The local impact of increased numbers of state employees on start-ups in Norway

ABSTRACT

The purpose of the article is to assess the impact of concentrations of state employees on local growth and development. Local multiplier effect theory suggests that the increased local demand for state employees, especially highly skilled employees, would stimulate the local supply of goods and services, and hence local development. However, other theories of regional development have shown that factors such as having a university or city size may also explain why some municipalities with a high percentage of state employees grow faster than others. Following a multilevel panel data analysis of Norwegian municipalities, the author found that the percentage of state employees did not have any effect on local development, measured in terms of the relative number of start-up firms or population growth. While there was a small positive effect of state employees in the bivariate model, state employees did not have a significant effect on local development when controlling for relevant factors such as municipality size or the presence of universities. The author concludes that the relocation of state employees may be a rather limited tool for stimulating local and regional growth and, if applied, policymakers should consider how the relocation could stimulate place-sensitive development in individual municipalities.     

A Roche model for uniformly rotating rings

A Roche model for describing uniformly rotating rings is presented, and the results are compared with the numerical solutions to the full problem for polytropic rings. In the thin ring limit, the surfaces of constant pressure including the surface of the ring itself are given in analytical terms, even in the mass-shedding case.     

Relativistic mean-field theory equation of state of neutron star matter and a Maxwellian phase transition to strange quark matter

The equation of state of neutron star matter is examined in terms of the relativistic mean-field theory, including a scalar-isovector δ-meson effective field. The constants of the theory are determined numerically so that the empirically known characteristics of symmetric nuclear matter are reproduced at the saturation density. The thermodynamic characteristics of both asymmetric nucleonic matter and β-equilibrium hadron-electron npe-plasmas are studied. Assuming that the transition to strange quark matter is an ordinary first-order phase transition described by Maxwell's rule, a detailed study is made of the variations in the parameters of the phase transition owing to the presence of a δ-meson field. The quark phase is described using an improved version of the bag model, in which interactions between quarks are accounted for in a one-gluon exchange approximation. The characteristics of the phase transition are determined for various values of the bag parameter within the range B ∈ [60,120]MeV/fm³ and it is shown that including a δ-meson field leads to a reduction in the phase transition pressure P ₀ and in the concentrations n _N and n _Q at the phase transition point. Translated from Astrofizika, Vol. 52, No. 1, pp. 147–164 (February 2009).     

SMS在新一代天气雷达运行状态监视报警中的应用

引言 新一代天气雷达具有观测时空分辨率高、连续工作等一系列特点,决定了它在现代气象观测业务中的重要地位。由于新一代天气雷达观测时间密度大,处于24h工作状态,不可避免会出现故障,依靠人工对其运行状态进行完全监视不可能实现,很多突如其来的故障不是马上就会引起雷达值班人员的注意,所以有必要建立新一代天气雷达运行状态监视和报警系统。     

辽东湾北部浅海区底泥砷元素形态特征

依据2006年辽东湾浅海评价资料,分析了辽东湾北部浅海底泥的砷元素全量和各形态的含量,对砷元素全量和存在形态的分布特征及相关性进行了系统研究,并探讨了其环境生态效应.结果表明:底泥中的砷含量为较高水平,存在形态主要为残渣态、腐植酸结合态和铁锰氧化态,而水溶态、碳酸盐结合态、离子交换态和强有机结合态含量较少.除砷的强有机结合态以外,全量和其他6种形态有很好的相关性,分布特征一致,高值区都分布在锦州湾及附近.并且生态效应明显,底泥中砷的腐殖酸结合态、铁锰氧化态、离子交换态与脉红螺中砷有显著相关性,碳酸盐结合态与锯缘青蟹和口虾蛄中砷有一定的相关性.     

Non-symmetrical sparking may hint “zits” on a pulsar surface

Pulsar electrodynamics could be relevant to the physics of stellar surface, which remains poorly understood for more than half a centenary and is difficult to probe due to the absence of direct and clear observational evidence. Nevertheless, highly sensitive telescopes (e.g., China's Five-hundred-meter Aperture Spherical radio Telescope, FAST) may play an essential role to solve the problem since the predicted surface condition would have quite different characteristics in some models of pulsar structure, especially after the establishment of the standard model of particle physics. For instance, small hills (or “zits”) may exist on solid strangeon star surface with rigidity, preferential discharge, that is, gap sparking, may occur around the hills in the polar cap region. In this work, with the 110-min polarization observation of PSR B0950 $$08 targeted by FAST, we report that the gap sparking is significantly non-symmetrical to the meridian plane on which the rotational and magnetic axes lie. It is then speculated that this asymmetry could be the result of preferential sparking around zits which might rise randomly on pulsar surface. Some polarization features of both single pulses and the mean pulse, as well as the cross-correlation function of different emission regions, have also been presented.