全文获取类型
| 收费全文 | 124篇 |
| 免费 | 1篇 |
专业分类
| 125篇 |
出版年
| 2023年 | 2篇 |
| 2022年 | 1篇 |
| 2021年 | 1篇 |
| 2020年 | 5篇 |
| 2019年 | 6篇 |
| 2018年 | 9篇 |
| 2017年 | 6篇 |
| 2016年 | 10篇 |
| 2015年 | 3篇 |
| 2014年 | 2篇 |
| 2013年 | 27篇 |
| 2012年 | 7篇 |
| 2011年 | 7篇 |
| 2010年 | 9篇 |
| 2009年 | 4篇 |
| 2008年 | 2篇 |
| 2007年 | 1篇 |
| 2006年 | 6篇 |
| 2005年 | 1篇 |
| 2003年 | 2篇 |
| 2002年 | 3篇 |
| 2001年 | 1篇 |
| 2000年 | 2篇 |
| 1999年 | 1篇 |
| 1995年 | 1篇 |
| 1993年 | 1篇 |
| 1987年 | 1篇 |
| 1983年 | 1篇 |
| 1982年 | 1篇 |
| 1980年 | 1篇 |
| 1979年 | 1篇 |
排序方式： 共有125条查询结果，搜索用时 15 毫秒
71.
72.
Yoshimitsu Fukushima Luis Fabián Bonilla Oona Scotti John Douglas 《Journal of Earthquake Engineering》2013,17(5):712-724
We classify sites based on their predominant period computed using average horizontal-to-vertical (H/V) response spectral ratios and examine the impact of this classification scheme on empirical ground-motion models. One advantage of this classification is that deep geological profiles and high shear-wave velocities are mapped to the resonance frequency of the site. We apply this classification scheme to the database of Fukushima et al. [2003], for which stations were originally classified as simply rock or soil. The calculation of average H/V response spectral ratios permits the majority of sites in the database to be unambiguously classified. Soft soil conditions are clearly apparent using this technique. Ground-motion prediction equations are then computed using this alternative classification scheme. The aleatoric variability of these equations (measured by their standard deviations) is slightly lower than those derived using only soil and rock classes. However, perhaps more importantly, predicted response spectra are radically different to those predicted using the soil/rock classification. In addition, since the H/V response spectral ratios were used to classify stations the predicted spectra for different sites show clear separation. Thus, site classification using the predominant period appears to be partially mapped into the site coefficients of the ground-motion model. 相似文献
73.
74.
75.
Evelyn Romina Vallone Raúl Ignacio Vezzosi Alberto Luis Cione 《Alcheringa: An Australasian Journal of Paleontology》2017,41(3):369-377
Vallone, E.R., Vezzosi, R.I. & Cione, A.L. February 2017. First fossil fish (Teleostei, Siluriformes) from the Late Pleistocene of Santa Fe Province, Argentina. Alcheringa 00, 000–000. ISSN 0311-5518.
The record of fossil fish from the Pleistocene of Argentina is poor. Here we describe the first ichthyofauna from Late Pleistocene riverbank beds in the Salado River of Santa Fe Province, Argentina. The material consists of isolated pectoral and dorsal fin spines, together with skull fragments. Four species-level taxa referable to three families can be identified: Pterodoras granulosus (Doradidae), Pimelodus cf. maculatus and Pimelodus cf. albicans (Pimelodidae) and cf. Hypostomus sp. (Loricariidae). Specimens attributed to Pterodoras granulosus and Pimelodus maculatus represent a minimum age for origin of these taxa. The Salado River assemblage includes the richest record of Pleistocene catfishes yet documented from southern South America.
Evelyn Romina Vallone [evelynvallone@conicet.
76.
José Luis Molina Luis Martínez-Cháfer Francesc Xavier Molina-Morales Miranda J. Lubbers 《European Planning Studies》2018,26(6):1160-1180
So far, the relationship between Industrial Districts (IDs; clusters of interconnected local industries) and migrant enclaves (areas with a high concentration of international migrants from a single nationality) has been studied mostly by focusing on the emergence of ‘ethnic enclave economies’ within the district and/or by highlighting racist conflicts that achieved notoriety in the media. In this study, we contend that there is a more general and complex interaction between the two phenomena. This interaction is mediated by the local context, national regulations, and the organization of the international market, among other factors. By focusing on the case of the ceramic ID of Castelló de la Plana (Spain), we show how this ID with a high rate of job formality, combined with other job opportunities and a unique ‘institutional completeness’, set up the conditions for a non-conflictive Romanian migrant enclave that reached 14% of the town’s total population in 2012. Finally, and also considering another case study of ID and migrant enclave (Prato, and its Chinese enclave), we suggest a model of interaction that should be interpreted taking into account the general dynamics of the international organization of value and the requirements of flexibility and reduction of costs that frame IDs. 相似文献
77.
78.
João Pedro Tereso Pablo Ramil-Rego Yolanda Álvarez González Luis López González Rubim Almeida-da-Silva 《Journal of archaeological science》2013
The highest platforms of As Laias, a settlement located in northwest Iberia, were used for storage during the Iron Age and until the turn of the Era. In this time-span, the whole hilltop – the croa – was a walled enclosure mostly used for storage and due to recurrent fires affecting the settlement's terraces, abundant plant remains were preserved in overlying wattle and daub storage structures. 相似文献
79.
Maria Lucia Refinetti Martins Alvaro Luis dos Santos Pereira 《European Planning Studies》2019,27(6):1129-1145
This article aims to highlight the main arguments that sought to justify the incorporation and legitimization of Urban Regeneration in the urban policy agenda in Brazil. It shows how the convergence between different and even conflicting propositions related to urban development provided ideological support to the construction of discourses in which urban regeneration is portrayed as beneficial to society as a whole, and how recent international ideas on urban development were incorporated in urban policies of contemporary Brazil, considering our local socio-economic and political environment, planning tradition and regulatory frameworks. The focus will be on Rio de Janeiro and particularly São Paulo given the key role these two cities play in defining urban policy paradigms, guiding government agendas and exporting regulatory models to other parts of Brazil. 相似文献
80.
Teen employment is a very important socioeconomic phenomenon because of its consequences on human capital formation. We assess the relation between teen employment and poverty, education, and unemployment in the city of Rosario, using information from the 2010 Argentina Census disaggregated at census block level. We use two different spatial models: The spatial lag model (SLM) and a linear regression model with the spatial component filtered (filtering model, FM). Given the nature of the variables employed, multicollinearity is an issue. One of the techniques proposed in the literature to deal with multicollinearity problems is principal component regression (PCR). We develop an adaptation of such methodology to be used in the SLM. Both models are estimated using their traditional methodologies (instrumental variables for the SLM and OLS for the FM) and using PCR. Although results are similar between the two models, depending on the methodology used in the estimations they differ greatly. Under traditional methodologies estimations show high variability, instability, and contradictory outcomes, but under PCR, results behave according to the literature. 相似文献