全文获取类型
收费全文 | 585篇 |
免费 | 31篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 7篇 |
综合类 | 1篇 |
化学工业 | 135篇 |
金属工艺 | 7篇 |
机械仪表 | 18篇 |
建筑科学 | 14篇 |
矿业工程 | 6篇 |
能源动力 | 12篇 |
轻工业 | 71篇 |
水利工程 | 3篇 |
石油天然气 | 3篇 |
武器工业 | 2篇 |
无线电 | 35篇 |
一般工业技术 | 104篇 |
冶金工业 | 104篇 |
原子能技术 | 12篇 |
自动化技术 | 83篇 |
出版年
2021年 | 18篇 |
2020年 | 9篇 |
2019年 | 11篇 |
2018年 | 14篇 |
2017年 | 12篇 |
2016年 | 21篇 |
2015年 | 17篇 |
2014年 | 17篇 |
2013年 | 44篇 |
2012年 | 21篇 |
2011年 | 35篇 |
2010年 | 23篇 |
2009年 | 23篇 |
2008年 | 28篇 |
2007年 | 23篇 |
2006年 | 21篇 |
2005年 | 21篇 |
2004年 | 16篇 |
2003年 | 13篇 |
2002年 | 13篇 |
2001年 | 9篇 |
2000年 | 5篇 |
1999年 | 10篇 |
1998年 | 28篇 |
1997年 | 16篇 |
1996年 | 15篇 |
1995年 | 13篇 |
1994年 | 6篇 |
1993年 | 13篇 |
1992年 | 10篇 |
1991年 | 9篇 |
1990年 | 6篇 |
1989年 | 10篇 |
1988年 | 7篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1971年 | 3篇 |
1969年 | 2篇 |
1940年 | 2篇 |
1912年 | 3篇 |
排序方式: 共有617条查询结果,搜索用时 140 毫秒
1.
Krzysztof Letachowicz Tomasz Gołębiowski Mariusz Kusztal Waldemar Letachowicz Wacław Weyde Marian Klinger 《Hemodialysis international. International Symposium on Home Hemodialysis》2015,19(4):E21-E23
We report a case of long‐term uneventful catheter use in a patient with previous recurrent vascular access dysfunction and infection. A single‐lumen tunneled catheter was inserted into the left internal jugular vein after a failed attempt of dual‐lumen permanent catheter placement. The follow‐up since device implantation has exceeded 5 years without any complications related to vascular access. 相似文献
2.
Marcelo Fernandes Cipreste Michele Rocha de Rezende Marlon Luiz Hneda Anderson Maia Peres Alexandre Alberto Chaves Cotta Verônica de Carvalho Teixeira Waldemar Augusto de Almeida Macedo Edésia Martins Barros de Sousa 《Ceramics International》2018,44(15):17800-17811
Hydroxyapatite (HA) nanoparticles (NPs) doped with different radioisotopes for use as theranostic systems play an important role in scientific research nowadays due to their ability to simultaneously act in the treatment and diagnosis of various types of cancers. In this work, we describe the synthesis and characterization of a hydroxyapatite/tenorite nanocomposite functionalized with folic acid, representing a nanotheranostic material with potential for application as an agent in positron emission tomography imaging systems and to act specifically in the treatment and diagnosis of osteosarcoma. 64Cu and 32P were produced by nuclear activation in the TRIGA reactor at CDTN. The obtained samples were characterized by XRD with Rietveld refinement, XAFS, SEM, BET, TGA, FTIR, CHN, ICP-AES, XPS and gamma spectroscopy. We investigated how CuO grows in HA NPs, the stability of the interactions between CuO and HA constituents and the interactions between folic acid and the surface of the HA NPs. The results indicate the formation of a second phase (tenorite) besides hydroxyapatite, and that the interactions between the two phases are stable, resulting in a nanocomposite. Furthermore, the activation of 64Cu and 32P inside the HA matrix, through the exposition to a neutron flux, produces a theranostic material of interest for biological tests. 相似文献
3.
Justyna Zygmuntowicz Paweł Falkowski Marcin Wachowski Konrad Cymerman Paulina Piotrkiewicz Waldemar Kaszuwara 《International Journal of Applied Ceramic Technology》2020,17(4):1731-1741
In the present research, the influence of sintering temperature on the microstructure and properties of Al2O3–Cu–Ni hybrid composites prepared by the Pulse Plasma Sintering (PPS) technique were described. In this research, three temperatures have been selected: 1250°C, 1300°C, and 1350°C. SEM observations were carried out to determine the distribution of the metallic phase in the composite depending on the sintering temperature. The conducted experiments and microscopic observations enabled a better understanding of the phenomena occurring between the ceramic matrix and metallic phase in the obtained materials. The mechanical properties like a hardness and fracture toughness were measured. The technology applied allowed us to obtain ceramic-metal composites with a homogeneous microstructure. It was found that the sintering temperature influences the selected physical and mechanical properties of the composites produced. It was found that samples produced at 1300°C are characterized by the highest relative density and the mechanical properties. 相似文献
4.
Universitärer Forschungscluster „Sustainable Technologies in Metal Production and Processing” (STMP)
H. Antrekowitsch H. Biedermann B. Buchmayr F. Ebner W. Eichlseder H. Harmuth W. Kepplinger F. Kessler W. Krieger K. Lorber A. Ludwig 《BHM Berg- und Hüttenm?nnische Monatshefte》2006,151(7):263-266
Foundation of a university research cluster — Co-operation along the value creation chain from raw materials to components — Evidence of joint performance offers — Utilization of synergies — Integration of Christian Doppler Laboratories — Flexible arrangement of co-operations and networks 相似文献
5.
Modeling of real physical processes by numerical methods is highly time-consuming and requires significant computational capacity. In some cases, tens or even hundreds of hours of high-power computing are needed to virtually model a real process that lasts one second. Processes that take many hours, such as drying, pose an even greater challenge. This problem can be solved in two ways: by using faster computers (such as computing clusters) or by significantly simplifying the modeled process (its geometry, physical phenomena, or the impact of individual factors). For this reason, all methods which speed up or minimize the number of simulations required to achieve the research objective should be analyzed. This article focuses on the latter approach, and it proposes a simple method for predicting the responses of a numerical model (values of any output parameter) to changes in input values (values of any input parameter). This method requires a base model, such as a numerical model which is qualitatively and quantitatively consistent with experimental observations, and a sensitivity analysis. This article discusses the mathematical and logical premises for the discussed model, and it proposes two methods for predicting numerical simulation results. Those methods are illustrated with examples which analyze the behavior of the Eulerian Multiphase Model and describe phase interactions based on Gidaspow's approach. The discussed example relies on data from a series of articles published by the authors in Drying Technology. This article was inspired by the observations made during a time-consuming process of modeling a spouted bed grain dryer, which was described in the above publications. The objective of this study was to discuss the advantages and possibilities created by sensitivity analyses of numerical models and to encourage their practical application. 相似文献
6.
7.
Waldemar Karwowski 《Theoretical Issues in Ergonomics Science》2013,14(1):76-91
According to the premise of ergonomics, system-human compatibility should be considered at all levels, including physical, perceptual, cognitive, emotional, social, organizational, and environmental considerations. This requires quantification of the inputs and outputs that characterize a set of system-human interactions. However, at the present time, no universal matrix for measurement of such compatibility exists. This paper proposes a new science of teleonomic artifact-human system compatibility. Symvatology, coined from two Greek words: 'symvatotis' (compatibility) and 'logos', will aim to discover and understand the various laws governing compatibility relations between people and the natural and artificial systems that surround them. Symvatology, which will observe, identify, describe, perform empirical investigations, and produce theoretical explanations about the natural phenomena of an artifact-human compatibility, should help to advance the progress of the ergonomics discipline by providing a methodology for design for compatibility, as well as design of compatibility between the artificial systems (technology) and humans. The paper also discusses some of the critical concepts of symvatology, including system design complexity, compatibility, entropy, system regulation, non-linear system behaviour, and chaos. 相似文献
8.
Applications of fuzzy‐based linguistic patterns for the assessment of computer screen design quality
Jerzy Grobelny Waldemar Karwowski Jozef Zurada 《International journal of human-computer interaction》2013,29(3):193-212
The main objective of this study was to develop a modeling framework which would unify different aspects of computer screen design and result in a quantitative criterion for an optimized computer screen format. The fuzzy set‐based linguistic design patterns were utilized as a tool to build this model. The linguistic patterns are based on categories of expressions related closely to natural language and truth values, which are close to a human designer's intuition. The proposed framework is capable of assessing the quality of computer screen design based on existing knowledge in human‐computer interface domain using the fuzzy‐based linguistic pattern approach. Exemplary patterns for an optimal screen density, information grouping, and some aspects of screen layout are presented, along with a sequence of calculations based on the exemplary screen format. This study showed that it is possible to achieve a rational and relatively easy to interpret assessment of different screen designs in the form of the degrees of truth. Such an evaluation criterion reflects the compatibility of a given screen design with the optimal one based on the current knowledge in the field. It is believed that the proposed methodological framework for computer screen design should significantly augment the efforts of human designers. 相似文献
9.
10.
Waldemar Krieger Evren Bayraktar Otto Mierka Lutz Kaiser Robin Dinter Julian Hennekes Stefan Turek Norbert Kockmann 《American Institute of Chemical Engineers》2020,66(6):e16953
The implementation of traditional sensors is a drawback when investigating mass transfer phenomena within microstructured devices, since they disturb the flow and reactor characteristics. An Arduino based slider setup is developed, which is equipped with a computer-vision system to track gas–liquid slug flow. This setup is combined with an optical analytical method allowing to compare experimental results against CFD simulations and investigate the entire lifetime of a single liquid slug with high spatial and temporal resolution. Volumetric mass transfer coefficients are measured and compared with data from literature and the mass transfer contribution of the liquid film is discussed. 相似文献