全文获取类型
收费全文 | 2350篇 |
免费 | 150篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 50篇 |
综合类 | 2篇 |
化学工业 | 435篇 |
金属工艺 | 30篇 |
机械仪表 | 57篇 |
建筑科学 | 95篇 |
矿业工程 | 2篇 |
能源动力 | 78篇 |
轻工业 | 217篇 |
水利工程 | 16篇 |
石油天然气 | 5篇 |
无线电 | 210篇 |
一般工业技术 | 486篇 |
冶金工业 | 470篇 |
原子能技术 | 18篇 |
自动化技术 | 332篇 |
出版年
2023年 | 35篇 |
2022年 | 44篇 |
2021年 | 81篇 |
2020年 | 58篇 |
2019年 | 60篇 |
2018年 | 59篇 |
2017年 | 43篇 |
2016年 | 83篇 |
2015年 | 68篇 |
2014年 | 73篇 |
2013年 | 131篇 |
2012年 | 152篇 |
2011年 | 188篇 |
2010年 | 137篇 |
2009年 | 97篇 |
2008年 | 126篇 |
2007年 | 118篇 |
2006年 | 96篇 |
2005年 | 68篇 |
2004年 | 61篇 |
2003年 | 49篇 |
2002年 | 45篇 |
2001年 | 25篇 |
2000年 | 25篇 |
1999年 | 23篇 |
1998年 | 79篇 |
1997年 | 57篇 |
1996年 | 31篇 |
1995年 | 37篇 |
1994年 | 22篇 |
1993年 | 24篇 |
1992年 | 20篇 |
1991年 | 15篇 |
1990年 | 16篇 |
1989年 | 15篇 |
1988年 | 9篇 |
1987年 | 13篇 |
1986年 | 11篇 |
1985年 | 13篇 |
1984年 | 12篇 |
1983年 | 15篇 |
1982年 | 12篇 |
1981年 | 20篇 |
1980年 | 10篇 |
1979年 | 12篇 |
1978年 | 9篇 |
1977年 | 11篇 |
1976年 | 15篇 |
1974年 | 10篇 |
1973年 | 9篇 |
排序方式: 共有2503条查询结果,搜索用时 0 毫秒
1.
Hammons Joshua A. Tumey Scott J. Idell Yaakov Jeffries Jason R. 《JOM Journal of the Minerals, Metals and Materials Society》2020,72(1):176-186
JOM - Alpha-radiation damage in metals is a concern for long-term radioactive storage and systems that produce nuclear energy. Accurate prediction of irradiated material properties and failure... 相似文献
2.
3.
Tolulope Joshua Ashaolu 《International Journal of Food Science & Technology》2021,56(8):3719-3725
Fervid interests on nanoparticles are increasing within the scientific and non-scientific communities, as they are utilised in food and non-food applications. The versatility of emerging applications of nanoparticles makes them potentially harmful to the food, healthcare and environment sectors, and thus necessitates the development of nanonutraceuticals from nutritional substances such as antioxidants, vitamins, fatty acids, fibres, probiotics and prebiotics. This review excavated state of the art on nanotechnology applications such as gold and selenium particles, nanolayers, nanobeads, nanoemulsions and nanofibers to probiotics and prebiotics for the synthesis of anticancer, antimicrobial, antioxidant and photo-reactive products among others, and finally delved into other noteworthy considerations like safety. It is concluded that available literature on the current status of nanoprobiotics and prebiotics are exhaustive, despite their huge potentials and applications. 相似文献
4.
Bram H. Frohock Jessica M. Gilbertie Dr. Jennifer C. Daiker Dr. Lauren V. Schnabel Dr. Joshua G. Pierce 《Chembiochem : a European journal of chemical biology》2020,21(7):933-937
The failure of frontline antibiotics in the clinic is one of the most serious threats to human health and requires a multitude of novel therapeutics and innovative approaches to treatment so as to curtail the growing crisis. In addition to traditional resistance mechanisms resulting in the lack of efficacy of many antibiotics, most chronic and recurring infections are further made tolerant to antibiotic action by the presence of biofilms. Herein, we report an expanded set of 5-benzylidene-4-oxazolidinones that are able to inhibit the formation of Staphylococcus aureus biofilms, disperse preformed biofilms, and, in combination with common antibiotics, are able to significantly reduce the bacterial load in a robust collagen-matrix model of biofilm infection. 相似文献
5.
Timothy Zurrer Kenneth Wong Jonathan Horlyck Emma C. Lovell Joshua Wright Nicholas M. Bedford Zhaojun Han Kang Liang Jason Scott Rose Amal 《Advanced functional materials》2021,31(9):2007624
The vast chemical and structural tunability of metal–organic frameworks (MOFs) are beginning to be harnessed as functional supports for catalytic nanoparticles spanning a range of applications. However, a lack of straightforward methods for producing nanoparticle-encapsulated MOFs as efficient heterogeneous catalysts limits their usage. Herein, a mixed-metal MOF, NiMg-MOF-74, is utilized as a template to disperse small Ni nanoclusters throughout the parent MOF. By exploiting the difference in Ni O and Mg O coordination bond strength, Ni2+ is selectively reduced to form highly dispersed Ni nanoclusters constrained by the parent MOF pore diameter, while Mg2+ remains coordinated in the framework. By varying the ratio of Ni to Mg in the parent MOF, accessible surface area and crystallinity can be tuned upon thermal treatment, influencing CO2 adsorption capacity and hydrogenation selectivity. The resulting Ni nanoclusters prove to be an active catalyst for CO2 methanation and are examined using extended X-ray absorption fine structure and X-ray photoelectron spectroscopy. By preserving a segment of the Mg2+-containing MOF framework, the composite system retains a portion of its CO2 adsorption capacity while continuing to deliver catalytic activity. The approach is thus critical for designing materials that can bridge the gap between carbon capture and CO2 utilization. 相似文献
6.
Joshua C. Price Simon J. Levett Valentin Radu David A. Simpson Aina Mogas Barcons Christopher F. Adams Melissa L. Mather 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(22)
Fluorescent nanodiamonds (fNDs) containing nitrogen vacancy (NV) centers are promising candidates for quantum sensing in biological environments. This work describes the fabrication and implementation of electrospun poly lactic‐co‐glycolic acid (PLGA) nanofibers embedded with fNDs for optical quantum sensing in an environment, which recapitulates the nanoscale architecture and topography of the cell niche. A protocol that produces uniformly dispersed fNDs within electrospun nanofibers is demonstrated and the resulting fibers are characterized using fluorescent microscopy and scanning electron microscopy (SEM). Optically detected magnetic resonance (ODMR) and longitudinal spin relaxometry results for fNDs and embedded fNDs are compared. A new approach for fast detection of time varying magnetic fields external to the fND embedded nanofibers is demonstrated. ODMR spectra are successfully acquired from a culture of live differentiated neural stem cells functioning as a connected neural network grown on fND embedded nanofibers. This work advances the current state of the art in quantum sensing by providing a versatile sensing platform that can be tailored to produce physiological‐like cell niches to replicate biologically relevant growth environments and fast measurement protocols for the detection of co‐ordinated endogenous signals from clinically relevant populations of electrically active neuronal circuits. 相似文献
7.
Smith J. David; Beran Michael J.; Redford Joshua S.; Washburn David A. 《Canadian Metallurgical Quarterly》2006,135(2):282
Although researchers are exploring animals' capacity for monitoring their states of uncertainty, the use of some paradigms allows the criticism that animals map avoidance responses to error-causing stimuli not because of uncertainty monitored but because of feedback signals and stimulus aversion. The authors addressed this criticism with an uncertainty-monitoring task in which participants completed blocks of trials with feedback deferred so that they could not associate reinforcement signals to particular stimuli or stimulus-response pairs. Humans and 1 of 2 monkeys were able to make cognitive, decisional uncertainty responses that were independent of feedback or reinforcement history within a task. This finding unifies the comparative literature on uncertainty monitoring. The dissociation of performance from reinforcement has theoretical implications, and the deferred-feedback technique has many applications. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
8.
This paper presents an overview of our recent work on the use of soft lithography and two-phase fluid flow to form arrays of droplets. The crucial issues in the formation of stable arrays of droplets and alternating droplets of two sets of aqueous solutions include the geometry of the microchannels, the capillary number, and the water fraction of the system. Glass capillaries could be coupled to the PDMS microchannels and droplets could be transferred into glass capillaries for long-term storage. The arrays of droplets have been applied to screen the conditions for protein crystallization with microbatch and vapor diffusion techniques. 相似文献
9.
10.
Joshua Israelsohn 《电子设计技术》2004,11(6):72-72,74,76,78,80
这是分上下篇连载的下篇(上篇见5月份的本刊),介绍了几个基本概念,使你能开始考虑如同进行低噪声设计。 相似文献