全文获取类型
收费全文 | 213篇 |
免费 | 10篇 |
专业分类
223篇 |
出版年
2025年 | 3篇 |
2024年 | 10篇 |
2023年 | 8篇 |
2022年 | 3篇 |
2021年 | 9篇 |
2020年 | 11篇 |
2019年 | 3篇 |
2018年 | 12篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 9篇 |
2013年 | 28篇 |
2012年 | 11篇 |
2011年 | 6篇 |
2010年 | 11篇 |
2009年 | 14篇 |
2008年 | 12篇 |
2007年 | 12篇 |
2006年 | 9篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 5篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1990年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
排序方式: 共有223条查询结果,搜索用时 0 毫秒
51.
长沙风篷岭M1出土漆器检测研究 总被引:2,自引:2,他引:0
长沙市风篷岭M1出土漆器百余件,为研究该批漆器的制造工艺及保护修复方法。选取多个样品采用扫描电子显微镜、X荧光光谱仪、红外光谱仪、X射线衍射仪等进行含水率、木胎种质、漆膜和漆灰成分多项检测。结果显示:木胎漆器含水率远大于夹纻胎;木胎漆器材质有楠木、梓木等;底漆层厚度大于面漆层;漆膜中的红色颜料为HgS,黑色颜料为C,白色颜料中含Ag较高;漆灰中含有大量SiO_2和CaO。本研究成果为研究夹苎胎漆器制作工艺提供了可靠依据。 相似文献
52.
环氧树脂类粘结材料目前已成为文物保护工作中常用的粘结材料。但是,在一些应用案例中经常发现环氧树脂类粘结材料有变色、脆化、剥落等老化现象。为了了解环氧类粘结材料的老化规律,摸清材料成分、配方和环境因素的影响,以通用双酚A型环氧树脂为主剂与各种典型固化剂、稀释剂、偶联剂等配制成黏结材料,模拟自然界极端环境条件,通过反复的破坏循环实验,探讨典型环氧类粘结材料的老化过程和机理。 相似文献
53.
为了了解上海松江广富林遗址出土周代铜器合金配比和加工工艺特点,对18件该地区出土周代铜器进行检测分析。使用X射线荧光光谱仪(XRF)和金相显微镜分析青铜样品的成分组成及金相显微组织并发现:样品中铅锡青铜器占绝大多数,器物含铅量普遍较高,且大多含少量砷;器物基本都是铸造成形,仅有少量实用工具、农具刃口进行过热锻等加工处理,以提高使用性能。结果反映了当时工匠对铸造合金配比和加工工艺的认知和技术水平,也体现了吴越地区独特的青铜技术体系与文化,能够为南方史前及先秦文化的发展脉络提供更多可供探讨的资料。 相似文献
54.
Ken MacLean 《History & Anthropology》2013,24(3):281-303
In 2006, the Museum of Ethnology organized a special exhibit on everyday life in Hanoi during the “subsidy period”, the term increasingly used to describe the decade of high socialism that began in 1975 with the reunification of a divided Vietnam and ended in 1986 with the official introduction of market reforms known as ??i m?i (Renovation). The representational strategies, which linked the collectivism of the past with the individualism of the present, prompted a nationwide discussion regarding the significance of a moment that previously had no clear name or place in official accounts due to the severe hardships it produced. The details presented demonstrate how the rehabilitation of this decade has expanded the political boundaries of what state institutions can present as having historical and ethnographic value in Vietnam as well as opened new avenues for comparative studies with (former) socialist states elsewhere. 相似文献
55.
《Journal of archaeological science》2013,40(7):3046-3057
The existing documentary history of Chinese porcelain ordered for the Portuguese market (mainly Ming dynasty.) is reasonably advanced; nevertheless detailed laboratory analyses able to reveal new aspects like the number and/or diversity of producing centers involved in the trade with Portugal are lacking.In this work, the chemical characterization of porcelain fragments collected during recent archaeological excavations from Portugal (Lisbon and Coimbra) was done for provenance issues: identification/differentiation of Chinese porcelain kilns used. Chemical analysis was performed by instrumental neutron activation analysis (INAA) using the Portuguese Research Reactor. Core samples were taken from the ceramic body avoiding contamination form the surface layers constituents. The results obtained so far point to: (1) the existence of three main chemical-based clusters; and (2) a general attribution of the porcelains studied to southern China kilns; (3) a few samples are specifically attributed to Jingdezhen and Zhangzhou kiln sites. In a chronological point of view, for the studied samples we assist to an increasing improvement of the production procedure from late 15th till the 17th centuries of the Chinese porcelains sent to Portugal, especially enhanced by the association of late porcelains with refining processes of the original raw material, consistent with removal of more heavy minerals. In the case of some samples a kiln attribution was possible, but for the majority of the samples we haven't found yet the specific kilns. 相似文献
56.
一批中国古代镶嵌玻璃珠化学成分的检测报告 总被引:4,自引:0,他引:4
结合外束质子激发X荧光(proton induced X-ray emission,PIXE)和能量色散X射线荧光(energy dispersive X-ray emission,EDXRF)分析技术,对中国新疆、湖北、四川、广东出土的古代镶嵌玻璃珠的化学成分进行了检测.结果表明:新疆拜城克孜尔墓地出土的西周-春秋时期镶嵌玻璃珠为CaO-MgO-SiO2玻璃,战国时期中国境内的PbO-BaO-SiO2和Na2O-CaO-SiO2镶嵌玻璃珠是同时存在的.本文亦对相关问题进行了一些讨论,并提出了部分今后的工作建议. 相似文献
57.
58.
Patricia Fara 《Interdisciplinary science reviews : ISR》2017,42(4):381-394
ABSTRACTUnder the leadership of soprano Frances M Lynch, Minerva Scientifica deploys sung theatrical performances to encourage, celebrate and demonstrate the achievements of women in science and music. Based on collaborative discussions between practising female scientists and contemporary classical composers, the events staged by Minerva Scientifica are receiving high acclaim not only as educational and musical experiences for general audiences, but also for enhancing scientists’ appreciation of their own work. Adopting a historical approach, this article first explores the relationships between three pairs – women and science, music and science, women and music – before giving a more detailed account of the project’s evolution since 2011. 相似文献
59.
The trace element boron is present in most ancient glasses as an impurity, and high boron (≥ 300 ppm) marks raw material sources that are geologically specific and relatively uncommon. Recent analyses of Byzantine glass with high boron contents suggest that glass‐making was not limited to the traditional regions of the Levant and Egypt, and a production origin in or near western Anatolia is proposed. Glass bracelets from ?i?n al‐Tīnāt in southern Turkey give fresh evidence for the production and circulation of high‐boron glasses that closely correlates with object typology. The patterning of findspots suggests that high‐boron glass was closely connected to the Byzantine world. 相似文献
60.
Mònica Aguilera Véronique Zech-Matterne Sébastien Lepetz Marie Balasse 《Environmental Archaeology》2018,23(4):323-337
ABSTRACTConsiderable archaeobotanical datasets describe cereal cultivation in north-eastern France, from the Iron Age to the Roman period. This study aims to complement these by using stable isotope analysis on charred cereal grains. Soil fertility was investigated through δ15N and δ13C analyses of 1480 charred cereal grains, dated from the Late La Tène to the Late Antiquity periods. In the Île-de-France, charred grain Δ13C values suggested good hydric conditions, with drier episodes in the 1st and 3rd century AD; while in Champagne, the lower Δ13C values for spelt reflect the lower water holding capacity of the chalky soils. A wide range of cereal δ15N values (0.8–8.7‰) implies a wide range of soil fertility conditions. Jouars-Pontchartrain and Palaiseau (Île-de-France) yielded the highest cereal δ15N values, whereas Acy-Romance (Champagne) delivered among the lowest. From these three sites, the δ15N values of red deer bone collagen were used to estimate the reference δ15N values for unmanured plants. Unlike in Acy-Romance, there were significant differences in Palaiseau and Jouars-Pontchartrain, indicating that the cultivated cereals inherited their high δ15N values from manured soil. At Jouars-Pontchartrain, the δ15N value (almost 9‰) suggested a high trophic level manuring source, possibly from pig and/or human faeces. 相似文献