全文获取类型
收费全文 | 92篇 |
免费 | 1篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 9篇 |
金属工艺 | 15篇 |
机械仪表 | 7篇 |
建筑科学 | 2篇 |
能源动力 | 8篇 |
轻工业 | 8篇 |
无线电 | 7篇 |
一般工业技术 | 27篇 |
冶金工业 | 10篇 |
自动化技术 | 3篇 |
出版年
2023年 | 2篇 |
2021年 | 4篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 5篇 |
2015年 | 1篇 |
2014年 | 7篇 |
2013年 | 6篇 |
2012年 | 3篇 |
2011年 | 10篇 |
2010年 | 15篇 |
2009年 | 11篇 |
2008年 | 6篇 |
2007年 | 1篇 |
2006年 | 3篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2000年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有97条查询结果,搜索用时 15 毫秒
31.
Kleber S. Cruz Elisangela S. Meza Frederico A.P. Fernandes José M.V. Quaresma Luiz C. Casteletti Amauri Garcia 《Metallurgical and Materials Transactions A》2010,41(4):972-984
Alloys of Al-Sn and Al-Si are widely used in tribological applications such as cylinder liners and journal bearings. Studies
of the influence of the as-cast microstructures of these alloys on the final mechanical properties and wear resistance can
be very useful for planning solidification conditions in order to permit a desired level of final properties to be achieved.
The aim of the present study was to contribute to a better understanding about the relationship between the scale of the dendritic
network and the corresponding mechanical properties and wear behavior. The Al-Sn (15 and 20 wt pct Sn) and Al-Si (3 and 5 wt
pct Si) alloys were directionally solidified under unsteady-state heat flow conditions in water-cooled molds in order to permit
samples with a wide range of dendritic spacings to be obtained. These samples were subjected to tensile and wear tests, and
experimental quantitative expressions correlating the ultimate tensile strength (UTS), yield tensile strength, elongation,
and wear volume to the primary dendritic arm spacing (DAS) have been determined. The wear resistance was shown to be significantly
affected by the scale of primary dendrite arm spacing. For Al-Si alloys, the refinement of the dendritic array improved the
wear resistance, while for the Al-Sn alloys, an opposite effect was observed, i.e., the increase in primary dendrite arm spacing improved the wear resistance. The effect of inverse segregation, which is
observed for Al-Sn alloys, on the wear resistance is also discussed. 相似文献
32.
Amauri J. Paula Rodrigo Parra Maria A. Zaghete Jos A. Varela 《Materials Letters》2008,62(17-18):2581-2584
One-dimensional nanostructures of KNbO3 have attracted a great interest in the scientific community, mainly because of their promising application as nanoelectromechanical systems (NEMS). However, the synthesis of KNbO3 structures becomes complex due to the natural tendency to form non-stoichiometric potassium niobates. In this context, we report on the crystallization of one-dimensional KNbO3 nanostructures through the reaction between Nb2O5 and KOH under microwave-assisted hydrothermal synthesis (M-H). The use of this synthesis method made possible a very fast synthesis of singlecrystalline powders. Based on SEM, TEM and XRD characterizations, the influence of the synthesis time and the reactants concentration in the structure and morphology of the resultant KNbO3 was established. The conditions that favor the crystallization of nanofingers were determined to be small amounts of Nb2O5 and short reaction times. 相似文献
33.
Alessandra Cremasco Célia M.A. Freire Amauri Garcia Rubens Caram 《Electrochimica acta》2008,53(14):4867-4874
Since the 1980s, the titanium alloys show attractive properties for biomedical applications where the most important factors are, firstly, biocompatibility, corrosion and mechanical resistances, low modulus of elasticity, very good strength to weight ratio, reasonable formability and osseointegration. The aim of this study was to investigate the effects of two different heat treatments; furnace cooling and water quenching, on the general electrochemical corrosion resistance of Ti-35 wt%Nb alloy samples immersed in a 0.9% NaCl (0.15 mol L−1) solution at 25 °C and neutral pH range. The samples were obtained using a non-consumable tungsten electrode furnace with a water-cooled copper hearth under argon atmosphere. The microstructural pattern was examined by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). In order to evaluate the electrochemical corrosion behavior of such Ti-Nb alloy samples, corrosion tests were performed by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. Analyses of an equivalent circuit have also been used to provide quantitative support for the discussions and understanding of the corrosion behavior. It was found that water quenching provides a microstructural pattern consisting of an alpha-martensite acicular phase which decreases the material electrochemical performance due to the stress-induced martensitic transformation. 相似文献
34.
35.
Stéfani D Paula AJ Vaz BG Silva RA Andrade NF Justo GZ Ferreira CV Filho AG Eberlin MN Alves OL 《Journal of hazardous materials》2011,189(1-2):391-396
The removal of oxidation debris from the oxidized carbon nanotube surface with a NaOH treatment is a key step for an effective functionalization and quality improvement of the carbon nanotube samples. In this work, we show via infrared spectroscopy and ultrahigh resolution and accuracy mass spectrometry that oxidation debris obtained from HNO(3)-treated multiwalled carbon nanotubes is a complex mixture of highly condensed aromatic oxygenated carbonaceous fragments. We have also evaluated their cytotoxicity by using BALB/c 3T3 mouse fibroblasts and HaCaT human keratinocytes as models. By knowing the negative aspects of dissolved organic carbon (DOC) to the water quality, we have demonstrated the removal of these carbon nanotube residues from the NaOH solution (wastewater) by using aluminium sulphate, which is a standard coagulant agent used in conventional drinking water purification and wastewater treatment plants. Our results contribute to elucidate the structural and proactive safety aspects of oxidation debris from oxidized carbon nanotubes towards a greener nanotechnology. 相似文献
36.
Júlia Hauck Tiburski Amauri Rosenthal Rosires Deliza Ronoel L. de Oliveira GodoySidney Pacheco 《Food research international (Ottawa, Ont.)》2011,44(7):2326-2331
Yellow mombin (Spondias mombin L.) is a tropical fruit with increasing acceptance in both national and international fruit markets. The aim of this work was to evaluate the centesimal composition, mineral content, total phenolics, antioxidant activity, and characterize the carotenoids of frozen yellow mombin pulp. Results indicated that the yellow mombin pulp contained an important amount of potassium and copper. The antioxidant activity and total phenolic values scored 17.5 mmol TEAC g−1 and 260 mg galic acid/100 g respectively, higher than those reported for other fruits. Five carotenoids were identified, ??-cryptoxanthin, lutein, zeinoxanthin, ?? and ?? carotene, being ??-cryptoxanthin the major one, accounting for the high level of pro-vitamin A activity in the pulp. A 100 g portion of yellow mombin pulp can provide more than 37% of the recommended daily allowance of vitamin A. 相似文献
37.
Marcolino Fernandes Jos Carlos Pires No Cheung Amauri Garcia 《Materials Characterization》2003,51(5):301-308
Nonmetallic inclusions are harmful to the mechanical properties of every kind of steel produced worldwide. The greater the size of the inclusion present in the structure of a determined kind of steel, the greater its negative effect on the quality of the steel. Therefore, the objective of this work was to investigate the size, the quantity, the shape and the chemical composition of nonmetallic inclusions formed throughout the refining process of silicon-killed, low-carbon steel, as a function of the treatment time in a ladle furnace, trying to ensure the flotation of inclusions bigger than 25 μm. This investigation was carried out using a scanning electron microscope (SEM), with an analysis system using energy dispersive spectometry (EDS). Based on this work, it was possible to know more precisely the nature of the inclusions, the necessary time to ensure flotation of large inclusions, the efficiency of the slag to capture the inclusions, and the inclusion level of the steel throughout its refining process to try to obtain a higher quality steel product. 相似文献
38.
39.
C. E. H. Ventura A. Hassui 《The International Journal of Advanced Manufacturing Technology》2013,65(9-12):1681-1689
One of the main operations in the manufacturing of molds and dies is the opening of the initial pocket, from which more complex geometries are machined, in order to obtain the negative shape of the final product. Since this is a rough operation, high cutting forces and significant tool wear are observed. Aiming to reduce such parameters, several strategies of tool entry and internal cut of the pocket have been proposed. In this context, this work aims to evaluate the cutting forces in the different parts of a pocket milling, using three different strategies, which are composed by the tool, cutting conditions, tool entry, and tool trajectory (I: ramp entry with spiral internal cut, II: helical entry with zigzag internal cut, and III: plunge entry). The results obtained for strategies I and II showed an increase in the forces in the direction perpendicular to the face in which flank wear occurred and a sharp increase in force at points where the tool changes trajectory. In strategy III, the occurrence of tool fracture due to chip recut led to very high force values. 相似文献
40.