中国城市人口户籍迁移的估算及时空特征——新型城镇化的落户政策导向

基于户籍人口自然与机械增长的分解,估算2011-2017年全国地级及以上城市的户籍迁移人口,对比分析户籍迁移和人口流动的时空特征,评估国家新型城镇化战略中按规模等级引导城市落户政策的影响.结果表明,近年来,中国户籍迁移日趋活跃,人口迁移与流动的空间格局高度耦合;迁入热点区主要集中在沿海三大城市群,迁出地较为分散,以长江...     

高倾角地层地震勘探在新疆尼勒克煤田勘探中的应用

尼勒克井田的浅表层地震地质条件差，深部地质构造复杂，地层倾角大。通过建立地质构造模型，反演出高倾角地层的地震记录，针对高倾角地层地震反射波的特点，采用小道距观测，在资料处理方法上着重注意原始资料分析、静校正处理、反褶积测试、叠前偏移技术等环节。该区勘探结果表明：在高倾角地层从事地震勘探，首先要根据地震地质条件作好构造模型及反演记录，着重做好变观措施，其次选取合理的处理模块，做好叠前偏移技术，兼顾干扰波去除，即可获得满意的勘探效果。     

石油和天然气运移、聚集的特征

虽然石油和天然气都是流体矿产，但它们的物理性质有很大不同，诸如：密度、粒度、溶解度、表面张力、扩散性等等，从而引起它们在运移和聚集特征上也有很大不同，这些不同的特征决定了天然气勘探的时空领域比石油更广阔，然而却比石油更难于保存下来。     

弹性波有限元逆时偏移技术研究

改善弹性波有限元逆时偏移剖面的质量是目前该方法面临的难题,为此,首先在有限元方程中,合理地加入边界力项,并找到准确的成像条件,以及对炮集资料用惠更斯（Huygens）原理消除直达波和面波干扰等措施,提高了复杂含油气结构的偏移剖面质量．本文重点研究单分量资料弹性波偏移的可靠性,利用单分量、抽炮集资料,模拟实际资料处理典型含油气构造,得到了高质量的自激自收和炮集资料的偏移剖面．     

盆地模拟水动力油气二次运移隐式多重网格法

本文提出一种高效率求解油气二次运移的方法,以水动力为油气运移模型,采用多重网格加速方法．典型油气二次运移的计算表明：该多重网格加速方法极大地提高了求解油气二次运移的偏微分方程速度,其计算工作量为O（N）（N为网格节点数）,解的收敛速度与网格尺度无关,当网格密度增加时,仍能保证偏微分方程解的稳定性．本文在数值模拟之后,对东营凹陷的实际资料进行了处理,其计算结果表明本文提出的多重网格方法对油气运移的计算有良好的实用意义．     

老龄化背景下候鸟旅游移民迁移驱动力 ——以三亚为例

以三亚为例,基于对256位候鸟旅游移民的实地调研,采用因子分析及方差分析等方法,探讨了候鸟旅游移民迁移驱动力的结构、强度及群体差异.结果表明:1)三亚候鸟旅游移民经济收入和文化水平相对较高,但也存在显著的内部差异;2)三亚候鸟旅游移民迁移驱动力由风景环境、社会资本、社会象征、城市服务、生活方式、家庭氛围及健康养生等7个...     

The new blackbirds? Vanuatu guestworkers in New Zealand

An agricultural guestworker scheme for Pacific island states began in New Zealand in 2007 to remedy domestic agricultural labour shortages. Vanuatu was one of the first countries to take advantage of the scheme. After a pilot venture in 2007 greater numbers of workers were recruited in 2008. In Tanna, the recruits, though mainly male, represented a cross‐section of the population. Their objectives were income generation for education fees, house building and eventually small business development. Early returnees acquired significant capital and met some of these objectives. The scheme has benefited both countries and the first generation of guestworkers.     

Estimating the Accuracy of Geographic Variation in Indigenous Population Counts

The ABS 2006 Post-Enumeration Survey was extended to include a sample of localities from the whole of Australia, thereby providing an estimate of census net undercount reflective of the enumeration in remote Indigenous settlements for the first time. The results revealed substantial undercounting of the Indigenous population in certain jurisdictions. At the same time, census counts in many locations were substantially higher than demographic factors could account for. The analytical and policy issues that arise from this revolve around a simple question: what credence can we give to observed spatial patterns of Indigenous population change? This paper seeks to provide an answer by establishing the spatial relationship between population change and net migration at the small area level. This reveals the detailed geography of census undercount and ‘overcount’ with the former common in remote areas and the latter most evident in regional towns and cities. The findings raise important policy issues about the proper interpretation of Indigenous population change data and the nature of estimates used to determine fiscal resourcing for Indigenous policies and programs.