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11.
Social housing in Australia is at a significant juncture. High levels of housing stress, increasing levels of socio-spatial polarisation and reduced government funding are posing complex policy challenges. Social mix policies are one response to these challenges, arising from the problematisation of social housing estates as socially excluded. This problematisation is examined through case studies of two Sydney social housing renewal projects: Telopea and Riverwood North. Drawing on interviews with government, private-sector and not-for-profit housing practitioners, the paper identifies two distinct discourses of social exclusion within this problematisation—culture of poverty discourse and equity discourse—that shape the implementation of social mix. These discourses reveal that implementing social mix is more complex than simply managing the cohabitation of residents in different tenures. Rather, the practice of social mix is embedded within discourses about the nature and causes of social exclusion. These discourses, in their turn, inform the multiple and sometimes conflicting aspirations pursued through social mix policies. 相似文献
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The problem of estimating the proportion of lithological (ore) types in volumes of mineral deposits is considered when an auxiliary variable Z(z) is observed along with the lithology L(x) at x. The process {Z(x)} is assumed to be stationary and an assumption on the statistical relationship between {Z(x)} and {L(x)} processes is made. Consequently, the second-order stationarity of {L(x)} is not required. A method using the kriged distribution of the auxiliary variable is proposed. A case study illustrating the procedure is given. 相似文献
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Javier Ruiz-Tagle 《Urban geography》2016,37(3):352-372
Public policies of social mixing have been enacted as the reversal of what segregation and concentrated poverty are presumed to have produced: intensified social problems (i.e., “neighborhood effects”). In addition, the pervasive discourses of diversity have provided more support for the idea of social mixing. Studies on planned and unplanned diverse neighborhoods have shown how certain diverse patterns can emerge and endure over time. Yet these studies have failed to explain how such demographic diversity becomes integration. In this article, I draw on a multidimensional perspective of socio-spatial integration to present a qualitative case study of the Cabrini Green/Near North area in Chicago—a neighborhood with a long history of segregation and recent socially engineered diversity. The case shows how contentious this new coexistence has been, and how segregation has been shifting its mechanisms of enforcement from housing to other spheres of life. I conclude with reflections on four dimensions of socio-spatial integration, and on the troubling policy and theoretical implications of the “social mix” paradigm. 相似文献
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由于硼(B)在自然界中分布较集中,平均丰度低,而且11B和10B之间质量差大,分馏效应显著,故元素硼及其同位素组成可以作为判定硼来源的指相标志和沉积环境。老挝龙湖钾盐矿区是呵叻高原钾盐矿在老挝境内最主要的矿区之一,ZK309钻孔在龙湖矿区具有代表性,通过对该钻孔盐岩上覆碎屑层的硼元素及其同位素的分析,B含量(56×10-6~103×10-6, wt.%),平均值为73×10-6;?11B的范围为+7.44‰到+11.62‰,平均+8.96‰,介于海水的?11B值(+39.5‰)及陆相地下水的δ11B值(-3±5‰)之间,B的含量认为中盐段岩盐层沉积后期曾明显有水流体的活动,这种水流体表现出偏向于淡水、咸水混合水特征,而B同位素研究认为粘土矿物的吸附作用是?11B降低的主要因素。 相似文献
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To simulate geological models comprising several litho-types—or facies—we need first to estimate their proportions, which are often poorly known. The corresponding uncertainties can be modelled using a Bayesian approach for inverting the multinomial distribution. The result obtained is known as the Dirichlet distribution. It can be simulated by decomposition into independent conditional distributions. Application of the model is extended to the case of nonstationary proportions and, with some approximation, to the case of correlated spatial data. The mathematical developments presented in the appendices provide a more precise and general definition of the distribution, several decomposition formulae into independent variables, the determination of remarkable stability properties, and the resulting consequences for the conditional and marginal distributions. 相似文献
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A new approach to null correlations of proportions 总被引:1,自引:0,他引:1
J. Aitchison 《Mathematical Geology》1981,13(2):175-189
Much work on the statistical analysis of compositional data has concentrated on the difficulty of interpreting correlations between proportions with an assortment of tests for nullcorrelations, for independence except for the constraint, F-independence of bounded variables, neutrality in the mean and in the median. This paper questions the appropriateness of characterizing the dependence structure of proportions in terms of such concepts, suggests an alternative method of modeling, develops necessary distribution theory and tests, and illustrates the methodology in applications. 相似文献
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The experimental results on adsorption of ions pb2+, Zn2+ and Ag+ onto mineral surfaces in a mix system show that the reaction kinetics of adions adsorbed onto mineral surfaces was mainly
controlled by their diffusion rates in solution. The concentration variations can be fit for the second-order rate equation
with good determined coefficients r = 0.800 5—0.979 7. In the near neutral solution, the concentration of exchanged ions K+ and Na+ related to reaction time can be described by the fint-order rate equation with r = 0.855 7–0.997 7. Meanwhile, the complex
diffusionexchange rate equation is suitable for describing the ca2
+ concentration variation, as ions Pb2
+ and Zn2+ were adions. Experimental data show that the amount of ions K+, Na+and Ca2+ release is much more than that of adion decrement in solution. This fact may suggest that the complexstion reaction of adions
Pb2+, Z2+ and Ag+ with the mineral surfaces was the major reaction process while adions were not entering the phyllosilicate interlayers or
CaCO3 lattice to exchange the ions K+, Na+ and Ca2+ at room temperature.
Project supported by the National Natural Science Foundation of China (Grant No. 49773206) and the Natural Science Foundation
of Guangdong Province (Grant No. 960504) 相似文献