全文获取类型
收费全文 | 1709篇 |
免费 | 47篇 |
国内免费 | 11篇 |
专业分类
电工技术 | 7篇 |
综合类 | 168篇 |
化学工业 | 270篇 |
金属工艺 | 29篇 |
机械仪表 | 9篇 |
建筑科学 | 768篇 |
矿业工程 | 7篇 |
能源动力 | 42篇 |
轻工业 | 154篇 |
石油天然气 | 2篇 |
无线电 | 31篇 |
一般工业技术 | 157篇 |
冶金工业 | 18篇 |
原子能技术 | 1篇 |
自动化技术 | 104篇 |
出版年
2024年 | 2篇 |
2023年 | 20篇 |
2022年 | 21篇 |
2021年 | 44篇 |
2020年 | 45篇 |
2019年 | 19篇 |
2018年 | 17篇 |
2017年 | 20篇 |
2016年 | 28篇 |
2015年 | 30篇 |
2014年 | 189篇 |
2013年 | 81篇 |
2012年 | 124篇 |
2011年 | 152篇 |
2010年 | 141篇 |
2009年 | 144篇 |
2008年 | 106篇 |
2007年 | 99篇 |
2006年 | 93篇 |
2005年 | 83篇 |
2004年 | 51篇 |
2003年 | 46篇 |
2002年 | 30篇 |
2001年 | 37篇 |
2000年 | 38篇 |
1999年 | 25篇 |
1998年 | 15篇 |
1997年 | 17篇 |
1996年 | 8篇 |
1995年 | 6篇 |
1994年 | 9篇 |
1993年 | 2篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1954年 | 1篇 |
排序方式: 共有1767条查询结果,搜索用时 93 毫秒
1.
Mohamed R. Rizk Muhammad G. Abd El-Moghny 《International Journal of Hydrogen Energy》2021,46(1):645-655
We report on glycerol electro-oxidation in alkaline medium at macroporous Ni electrodes decorated with Cu particles. Macroporous Ni film is electrodeposited, using hydrogen bubbles as dynamic templates, atop of a Cu substrate. This film shows good electrocatalytic activity towards glycerol oxidation reaction (GOR). The Ni film is further decorated with Cu via spontaneous deposition from CuSO4 solution. This is done to enhance the catalytic activity of the film towards GOR. The morphology of the Cu-decorated Ni film is controlled using various additives such as KCl and (NH4)2SO4 which are added to the Cu deposition bath. The as-prepared Cu-decorated Ni films are characterized by electrochemical measurements, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). It is found that these additives have tremendous effects on the morphology and the electrocatalytic activity of the decorating Cu particles.The decorated Ni foam showed superior electrocatalytic activity towards the GOR, as confirmed by the negative shift in the onset oxidation potential (ca. 100 mV) together with an increase in oxidation current that is up to 1.5-fold during the cyclic voltammetry (CV) measurements, compared to the undecorated Ni foam. 相似文献
2.
基于非物质视角下分析珠绣装饰设计语言的整体特征,文章认为材料、图纹、工艺是促进其装饰设计语言变化的重要构成元素,同时以案例分析分别从视觉形态、符号指代、形式序列及思维界域等角度对珠绣装饰设计语言的演绎现状进行归纳。分析表明:人文意识的介入使珠绣装饰设计建立起全新的审美观念和创作模式,并基于艺术和技术的彼此糅合衍生出装饰设计语言的诸多表达形式,从而为现代珠绣的装饰创新运用提供灵感来源及设计思路。 相似文献
3.
婴戏纹饰即描绘儿童游戏时的画作,是中国人物画的一种,更是陶瓷装饰中常见的传统题材。其主要以儿童为主要绘画对象,表现儿童纯真,或借以其他物象,组成吉祥图案,在我国陶瓷绘画上广泛运用,有着深刻的社会形态特征和思想文化的背景。其始于唐代,兴盛于宋金,明清两朝日臻成熟,并延续至今。在西方艺术史当中,儿童形象大都通过神话人物或宗教相关的艺术品走进人们视野,用以表现某些宗教思想或精神诉求。本文主要探讨陶瓷婴戏纹饰在我国历史发展历程中的演变概况,以及笔者对我国陶瓷婴戏纹饰和西方艺术品中儿童形象横向对比下的一些思考。 相似文献
4.
祈寿纹样是指传达祈求长寿愿望的纹样,构成题材与造型表现多样。文章基于江南大学、北京服装学院和东华大学服饰博物馆的93件带有祈寿纹样传世服饰品,从装饰题材和形式美的角度,对祈寿纹样的造型特征进行了归纳与总结,比较出祈寿纹样在近代男装、女装、童装中的不同表现形式,并进一步结合实例探析祈寿纹样的文化意蕴。研究认为,祈寿纹样造型包括艺术化变形与具象写实两种,纹样组合自由多变,在不同着装人群服饰中造型差异明显;祈寿纹样作为一种装饰载体,是民间百姓“护子佑子”的精神寄托,婚庆佳节和谐合好、生日诞辰长寿不老的美好祝愿。 相似文献
5.
《Ceramics International》2020,46(2):1690-1696
Preparation of cupric oxide-silicon dioxide nanoparticles was carried out using a sol-gel method. Cupric oxide-silicon dioxide nanoparticles were decorated by different weight percent of platinum (0.5, 1.0, 3.0 and 5.0 wt %) using method of photoassisted deposition. XRD remarks revealed that XRD patterns for all samples are composed of cupric oxide. Therefore, silicon dioxide is amorphous and decoration of cupric oxide-silicon dioxide nanoparticles by platinum has no effect on the formed phase. Also, due to low percent of platinum there are no peaks for platinum oxide or platinum. Cupric oxide has bandgap energy absorb in visible region but has high e-h recombination rate. Decoration of cupric oxide-silicon dioxide nanoparticles by platinum was decreased bandgap energy from 2.38 to 1.91 eV and also decrease rate of e-h recombination rate. The photocatalytic activity of platinum decorated cupric oxide-silicon dioxide nanoparticles was measured under visible light for Acridine orange dye degradation. 100% of Acridine orange dye can be degraded using 3.0 wt % of platinum decorated cupric oxide-silicon dioxide photocatalyst, 1.2 g/L dose of platinum decorated cupric oxide-silicon dioxide photocatalyst and 30 min reaction time. 3.0 wt % of platinum decorated cupric oxide-silicon dioxide photocatalyst has photocatalytic stability for five times. 相似文献
6.
A strongly electron deficient and high triplet energy host for blue emitters was developed by decorating a dibenzofuran modified biphenyl backbone structure with multiple CN units. Two hosts, 6,6′-bis(6-cyanodibenzo[b,d]furan-4-yl)-[1,1′-biphenyl]-3,3′-dicarbonitrile(CNDBF1) and 2,2′-bis(6-cyanodibenzo[b,d]furan-4-yl)-[1,1′-biphenyl]-4,4′-dicarbonitrile(CNDBF2), were derived from the CN decoration strategy for application in blue organic light-emitting diodes requiring high triplet energy host. They showed high triplet energy above 2.79 eV and acted as the electron transport type host based on the strong electron deficiency. The mixture of the CNDBF1 and CNDBF2 hosts with a hole transport type 3,3′-di(9H-carbazol-9-yl)-1,1′-biphenyl host performed as the exciplex host of a blue phosphor and accomplished high external quantum efficiency of 22.7% in the blue phosphorescent organic light-emitting diodes. 相似文献
7.
8.
9.
《Ceramics International》2015,41(8):9878-9884
The provenance of cobalt mineral of the blue decoration in Yuan Qinghua porcelain would reveal the technological and cultural interaction between ancient China and the Islamic world. However, the limitation of conventional methods in the determining trace elements of the blue decoration hampered the deep research on provenance of the cobalt mineral. In the paper, we employed the good advantage of Laser-ablation-inductively-coupled-plasma-mass-spectroscopy (LA-ICP-MS) to determine the major element and trace elements of blue decoration of the different type of Qinghua successfully. The blue decoration of all different types of samples shared the same characteristics of higher FeO and lower Mn, which suggested the potter adopted the non-native cobalt material of China to paint the Yuan Qinghua in Jingdezheng, and the difference on the outside appearance of blue decoration of different samples were supposed to be related to the tenor of ore, the different treatment process of cobalt material and the firing process in the kiln. In addition, the significant differences on the element concentrations of Cu, Ni, Pb, Zr and Sb in the blue decoration between Yuan Qinghua and the Islamic blue and white wares of 13–14th century provided a new evidence to discuss the provenance of the cobalt of Yuan Qinghua porcelain. 相似文献
10.
装配式装修作为一个全新的课题被提出,其课题价值受到愈来愈多人的重视。其所体现的特征如标准化设计、工厂化生产、装配(式)化施工、一体化装修、(智能)信息化管理等概念,也被认为符合整个建筑业装配化发展的大趋势。本文探讨了校企合作在推动产业与学科建设、培养适应产业发展需求人才等方面的重要作用,为装配式装修人才培养模式提供参考。 相似文献