全文获取类型
收费全文 | 189篇 |
免费 | 19篇 |
出版年
2024年 | 1篇 |
2021年 | 1篇 |
2020年 | 7篇 |
2019年 | 10篇 |
2018年 | 7篇 |
2017年 | 7篇 |
2016年 | 11篇 |
2015年 | 11篇 |
2014年 | 11篇 |
2013年 | 28篇 |
2012年 | 5篇 |
2011年 | 13篇 |
2010年 | 9篇 |
2009年 | 10篇 |
2008年 | 5篇 |
2007年 | 10篇 |
2006年 | 2篇 |
2005年 | 3篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 6篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1970年 | 2篇 |
1966年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有208条查询结果,搜索用时 15 毫秒
51.
L. L. Dai Z. P. Li C. Q. Zhao J. Yuan L. L. Hou C. S. Wang B. T. Fuller Y. W. Hu 《International Journal of Osteoarchaeology》2016,26(5):885-896
Located in the Central Plains of China, the early Xia Dynasty site of Xinzhai (2050 BC–1750 BC) with large archaeological features and exquisite artifacts of jade and copper is pivotal for probing the origin and formation of Chinese civilisation. Here, stable isotope ratios analysis, supplemented by zooarchaeological results, was used to investigate the exploitation and management of animals utilised by humans. It was demonstrated that a diverse pattern of animal raising and exploitation was present at the Xinzhai site. The domestic pigs were fed with substantial amounts of millets or their byproducts to guarantee a food source for the dietary demands of the humans. Dogs were also found to have consumed large amounts of C4 protein sources, likely in the form of human food scraps or leftovers. The domestic herbivores, sheep and cattle, showed different dietary characteristics in that the former mainly grazed in the natural environment, while the latter species were fed with large amounts of C4 products. This intra‐species variation was somewhat related to their physiological characteristics but seems to have been more determined by their different status in social and ritual activities. Thus, this research at Xinzhai provides a glimpse of the organisation of animal resources during the initial formation of Chinese civilisation. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
52.
The adsorption onto other minerals of charged gold nanoparticles, carried by gas ascending from the Earth’s interior, is an important component of their transport and deposition in surficial cover such as alluvial, aeolian, and glacial sediments. To simulate the adsorption of these particles, an experiment was conducted in which a flow of air that contained gold nanoparticles was passed upward through a sample of alluvium from the middle–lower reaches of the Yangtze River. These experiments showed that gold nanoparticles are adsorbed on kaolinite, halloysite, goethite, and hematite in the alluvial cover. Both the gold nanoparticles and minerals (i.e., kaolinite, halloysite, goethite, and hematite) carry surface charges that provide them with excellent adsorption properties. This study showed that the specific mineral composition of surficial alluvial cover affects the concentration of gold nanoparticles in the ascending gas. This phenomenon may plausibly be used in exploration for concealed gold, copper–gold, and silver–gold deposits in areas of thick alluvial cover. Geofluids (2010) 10 , 438–446 相似文献
53.
This paper presents new chronological data applied to the problem of providing a date for the construction of a prehistoric building, with a case study from the Old Scatness Broch, Shetland. The innovative methodology employed utilises the combination of radiocarbon and optically stimulated luminescence (OSL) dates with the archaeological information, which includes the stratigraphic relationships of sampled deposits, context information, and evidence relating to the formation of the deposit. This paper discusses the scientific validity of the dates produced, and the advantages that the methodology employed at this site offers for archaeological interpretation. The combined dating evidence suggests that the broch at Old Scatness is earlier than the conventionally accepted dates for broch construction. More broadly it shows the value of integration of the specialists at the planning stages of the excavation. The application of a Bayesian statistical model to the sequences of dates allowed investigation of the robustness of the dates within the stratigraphic sequences, as well as increasing the resolution of the resulting chronology. In addition, the value of utilising multiple dating techniques on the same deposit was demonstrated, as this allowed different dated events to be directly compared as well as issues relating to the formation of the sampled deposit. This in turn impacted on the chronological significance of the resulting dating evidence, and therefore the confidence that could be placed in the results. 相似文献
54.
Y. Z. Zhangsun Z. Y. Jin F. Z. Feng J. H. Tian H. G. Wang C. C. Zhao F. Huang X. T. Wu 《Archaeometry》2021,63(1):122-141
The provenance of the highly radiogenic lead (HRL) contained in Chinese Shang bronzes has attracted great scholarly attention in recent years. A new study of the Hanzhong Shang bronzes has put forward a hypothesis that the HRL metal may come from the adjacent Qinling Mountains. This article reanalyses the lead isotope ratios and alloy compositions of the Hanzhong bronzes. Combining the analytical results, the modern ore data and the slags from Guanzhong area, we propose that there is no direct evidence to identify Qinling as the provenance of HRL metal (especially lead). Whilst over 80% of the Hanzhong bronzes contain HRL, the indigenous artefacts containing both HRL and special alloying elements (As, Sb, Ni) account only for minor portions. This fact cannot verify that HRL originates from Qinling, and even makes it difficult to prove that most of the Hanzhong bronzes use local metal resources. An alternative argument might be that the HRL used in Hanzhong derived from the Shang dynasty. The use of HRL reflects a unified system for allocating metal resources centred on the Shang kingdom, which has great significance for further understanding of the resource circulation patterns among different bronze cultures and locations during the Shang period. 相似文献
55.
Mary Fearnley-Sander Z. Mawardi Effendi Isnarmi Zulfahmi Wahidul Basri Nurhizrah Gistituati 《Australian journal of political science》2001,36(2):325-345
This paper is a case study examination of the orientation of adolescents in West Sumatra towards the New Order Pancasila, Indonesia's state ideology, before and during the transition from the New Order regime. Pancasila in the New Order affirmed an integralist identity of interest between the state and the citizen, and between citizens at all levels of society. Integralism runs counter to the differentiated interests, institutions and identities of political community in liberalism. The concern of the paper is what effect a schooling in integralism had on students' receptivity to the prospect of an alternative, liberal model of politics; and whether that receptivity could be ascribed to political learning from the transition. The study found that students at elite schools shifted away from Pancasila and integralism in the year of Suharto's fall, while those at poorer schools did not; and that high levels of expressed support for Pancasila were good predictors of integralistic views on a series of attitudinal variables. 相似文献
56.
F. Bernardini A. De Min D. Lenaz Z. Kasztovszky P. Turk A. Velušček V. Szilágyi C. Tuniz E. Montagnari Kokelj 《Archaeometry》2014,56(2):175-202
In this paper we show the results of a study concerning 42 axes, mainly discovered in the Copper Age pile dwellings of Ljubljansko barje (central Slovenia) and in the neighbouring areas of Caput Adriae. The studied shaft‐hole axes, characterized by homogeneous typology but slightly different raw materials, have been called ‘Ljubljana‐type’ axes (Lt). The raw materials show a common OIB‐like signature and metamorphic and spilitization features that recall oceanic conditions. The typological and geochemical characteristics and the very high percentage of Lt axes among the polished stone axe assemblages of Ljubljansko barje suggest that the raw material was probably gathered from one or more relatively small outcrops close to Ljubljansko barje. Similar igneous rock types outcrop in the presumably Palaeozoic diabase/shale complex (Eisenkappler Diabaszug), intruded by the northern Karawanken plutonic belt. A probable provenance from this area, particularly rich in copper ore deposit, would confirm the important role of Ljubljansko barje as a metallurgical district, as well as a strong relation between lithic raw materials and Cu cultivation districts during the Copper age. 相似文献
57.
Z. Bai I. Anteri E. kori K. Vilovi . Anelinovi 《International Journal of Osteoarchaeology》2014,24(4):540-542
During the anthropological analysis of skeletal material dated in the 16th–19th century from St Katarina monastery in Split, a female skull with occipitalization of atlas has been found. Anterior part of atlas and foramen magnum were fused, with numerous perforations on auricular surface of atlas. As the age at death was estimated at more than 70 years, it is most likely that this woman had progressive course of illness. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
58.
Drawing on the debate over dolphin captivity in Singapore, we examine the ways in which human–animal relationships are contested. Departing from most animal geography studies which often focused on the conflictual spatial transgressions of animals into human spaces, we use the idea of ‘captivity’ as a heuristic to posit that human–animal relationships are necessarily moral, spatially enmeshed in contestations over what is (un)natural and increasingly entwined in legal geographies. While such an argument mirrors other sites of animal captivity (for example, zoos), dolphin captivity sits in a more ambiguous legal terrain than most other captive animals in zoos. Moreover, the very ‘nature’ of dolphins makes debates over their ‘authenticity’ ever more complex. The moralities of cetaceans are simultaneously underpinned by questions of the spatial (‘captive sites’ and ‘open seas’), the socio-cultural (‘charismatic animals’) and the legal (‘regulatory frameworks governing their welfare and whether they are endangered or not’). Hitherto, cetaceans are less researched (compared to terrestrial creatures) in animal geographies with even fewer studies focusing on cetacean captivity. We call for an expanded notion of ‘captivity’ that is relative, relational and non-absolute and underpinned by the notions of ‘nature’. In so doing, we align ourselves more with the anti-captivity camp. 相似文献
59.
This study reconstructs the palaeohydrogeologic evolution of the shallow‐to‐moderate Mesozoic subsidence history for the Mecsekalja Zone (MZ), a narrow metamorphic belt in the eastern Mecsek Mountains, Hungary. Brittle deformation of the MZ produced a vein system with a cement history consisting of five sequential carbonate generations and one quartz phase. Vein textures suggest different fluid‐flow mechanisms for the parent fluids of subsequent cement generations. Combined microthermometric and stable‐isotope measurements permit reconstruction of the character of subsequent fluid generations with different flow types, as defined by vein textures, yielding new information regarding the hydraulic behaviour of a metamorphic crystalline complex. Textural observations and geochemical data suggest that fracture‐controlled flow pathways and externally derived fluids were typical of some flow events, while percolation through the rock matrix and the relationship to the Cretaceous volcanism and dyke emplacement were typical of others. The difference in the mode of calcite deposition from pervasive fluids (i.e. pervasive carbonatisation along grain boundaries versus deposition in antitaxial veins) between two calcite generations related to the volcanism inspired a stress‐dependent model of antitaxial vein growth. Textural and isotope variations in a vein generation produced by the same parent fluid indicate rock‐dependent hydraulic behaviour for different rock types, distinct action of the contemporaneous fracture systems and different extents of fluid–rock interaction. Cathodoluminescence microscopy and fluid‐inclusion microthermometry shed light on the possible role of hydraulic fracturing in the formation of massive calcite. The time of formation was estimated from the isotope composition of the oldest calcite generation and its presumptive relationship with the sedimentary sequences to the north, whereas microthermometry permitted conciliation of the reconstructed flow sequence with the Mesozoic subsidence history of the Mórágy Block (including the MZ). 相似文献
60.
The objective of this study is to obtain quantitative evidence of pore‐scale immiscible fluid distribution in oil‐wet and water‐wet porous media using X‐ray computed microtomography. Temporal and spatial saturation profiles, as well as surface and interfacial areas, are thoroughly analyzed through cycles of drainage and imbibition using samples with different wetting characteristics but similar pore structures. The population of individual immiscible fluid structures (‘blobs’) was also evaluated. The specific nonwetting phase surface areas of both porous media are found to be in close correlation with the specific solid surface area. On the other hand, the differing wetting strengths of the two porous media affect the curvature of the fluid–fluid interface and thus the specific meniscus interfacial area of the two porous media. Although the magnitude of the specific meniscus interfacial areas is different, they both trend toward a maximum at wetting phase saturations of 0.35–0.55. The differences in wetting characteristics are also apparent in the blob populations. The number of blobs in the oil‐wet porous media is three times greater than that of the water‐wet porous media at similar saturations; the increase in population is a result of the increase in the amount of smaller blobs inhabiting the smaller pore spaces. The surface areas of individual blobs as a function of the individual blob volumes are found to closely agree with the specific surface area of a sphere at blob volumes below the minimum individual grain volume and with the specific pore space surface area above this volume. These results show how wettability and saturation history influence the distribution of immiscible fluids within the pore space. 相似文献