全文获取类型
收费全文 | 241篇 |
免费 | 23篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 68篇 |
金属工艺 | 14篇 |
机械仪表 | 5篇 |
建筑科学 | 4篇 |
能源动力 | 7篇 |
轻工业 | 46篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 12篇 |
一般工业技术 | 34篇 |
冶金工业 | 38篇 |
原子能技术 | 5篇 |
自动化技术 | 25篇 |
出版年
2023年 | 3篇 |
2022年 | 7篇 |
2021年 | 10篇 |
2020年 | 2篇 |
2019年 | 11篇 |
2018年 | 10篇 |
2017年 | 12篇 |
2016年 | 12篇 |
2015年 | 8篇 |
2014年 | 8篇 |
2013年 | 19篇 |
2012年 | 12篇 |
2011年 | 13篇 |
2010年 | 13篇 |
2009年 | 14篇 |
2008年 | 7篇 |
2007年 | 7篇 |
2006年 | 10篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 7篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 7篇 |
1997年 | 13篇 |
1996年 | 7篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有264条查询结果,搜索用时 15 毫秒
61.
C Castel Aznar J Tamarit Torres F Hervás Olivares V Pozuelo Escudero 《Canadian Metallurgical Quarterly》1976,23(135):239-261
We have studied the effect of the i.v. administration of 1 g tolbutamide upon glycemia, insulinemia and serotoninemia in normal subjects and obese patients. We have seen an elevation of the last two variables in direct relationship with the previous blood sugar levels. The baseline serotonin level in obese people is higher than in normals, but the tolbutamide induced elevation is of a lesser magnitude. We believe this fact is due to the competitive action of insulin, as our obese patients have shown to have a "hyperinsulinism" with "disinsulinism". 相似文献
62.
F. L. S. Cuppo A. García‐Valenzuela J. A. Olivares 《Color research and application》2013,38(3):177-187
In this work, we discuss the effect of surface roughness on the measurement of the diffuse to near‐normal viewing reflectance factor of coatings and evaluate its impact on the corresponding color coordinates. We compare specular component included (SCI) and excluded measurements. We introduce a gloss‐factor to account for surface roughness in specular component excluded measurements. We present experimental results on samples with different degrees of surface roughness. Samples in this study were chosen to expose the contribution of the surface in the reflectance factor. For slightly rough surfaces, the influence on the measured reflectance factor depends on whether the specular‐component is included or excluded. As the surface roughness increases, the specular‐excluded reflectance factor increases approaching its value with the SCI further roughness lead to similar measurement results in both configurations. © 2012 Wiley Periodicals, Inc. Col Res Appl, 38, 177–187, 2013. 相似文献
63.
Rodolfo Bonifacio Stefano Olivares Paolo Tombesi David Vitali 《Journal of Modern Optics》2013,60(12):2199-2211
Abstract Decoherence may be due to the fluctuations of some classical variable or parameter of a system, and not only to the entanglement with the environment. Here we derive a model-independent formalism for this non-dissipative decoherence, which is then applied to describe the decoherence observed in some recent Rabi oscillation experiments. 相似文献
64.
O. Olivares‐Xometl N. V. Likhanova R. Martínez‐Palou M. A. Domínguez‐Aguilar 《工业材料与腐蚀》2009,60(1):14-21
The effect of 2‐(2‐heptadec‐8‐enyl‐4,5‐dihydro‐imidazol‐1‐yl)‐ethylamine on the corrosion behavior of mild steel in aqueous hydrochloric acid was investigated using weight loss measurements, polarization scans, electrochemical impedance, and X‐ray photoelectron spectroscopy (XPS). The inhibition efficiencies and coverage degrees increased with the concentration of inhibitor but decreased proportionally with temperature. It appears that the steric hindrance of the aliphatic chain on the imidazoline ring adsorption may affect inhibitor efficiency. Polarization curves showed that the oleic imidazoline (OI) acted essentially as a mixed type inhibitor, in which the blocking of active sites occurred. As a result of film formation, impedance spectra revealed a considerable increase in the charge transfer resistance as indicated by the second capacitive loop. XPS depth profile analysis observed the presence of nitrogen and carbon species on the inhibitor film, which were associated to the OI. 相似文献
65.
Experimental bird-strike tests were conducted using a dead chicken of 8lb with a speed of 250kts that hit on leading edge bay in composite material made with aluminium alloy 2024-T3, core panel of honeycomb and GLARE cover plates. A validated simulation methodology has been developed in order to use a reference in further bird test certification procedure on the fin of the C27-J aircraft. 相似文献
66.
Flórez YN Moratal D Forner J Martí-Bonmatí L Arana E Guajardo-Hernández U Millet-Roig J 《Magma (New York, N.Y.)》2006,19(2):78-87
Objective: Quantification of the cerebrospinal fluid (CSF) flow through the aqueduct of Sylvius by means of magnetic resonance imaging (MRI) is subject to interobserver variability due to the region of interest (ROI) selection. Our objective is to develop a semiautomatic measurement method to achieve reproducible quantitative analysis of CSF flow rate and stroke volume. Material and methods: MR examinations were performed using a 1.5 T scanner with a phase contrast sequence (velocity encoding [V
enc] of 20 cm/s, FOV = 160, 3 mm slice thickness, image matrix size = 256×256, TR = 53 ms, TE = 11 ms, NSA = 2, flip angle = 15° and 23 frames per cardiac cycle with peripheral retrospective pulse gating). Our method was developed using MATLAB R7. Errors introduced by background offset and possible aliased pixels were automatically detected and corrected if necessary in order to calculate the flow parameters that characterize CSF dynamics. The semiautomatic seed method reproducibility was evaluated and compared with the radius method by two observers analysing 21 healthy subjects. Results: The measurements using the semiautomatic seed method reduced the interobservers variability (intra-class correlation [ICC] = 1.0 for stroke volume and for volumetric flow rate) versus the radius method (ICC = 0.46 for stroke volume and 0.65 for flow rate). Normal stroke volume (39.19 ± 20.13 μl/cycle), flow rate (3.81 ± 2.81 ml/min), maximal mean systolic velocity (5.27 ± 1.3 cm/s) and maximal mean diastolic velocity (4.20 ± 1.4 cm/s) were calculated with the half moon and aliasing corrected seed method. Conclusions: Semiautomatic measurements (seed method with half moon background and aliasing correction) allow a generalization of the calculus of flow parameters with great consistency and independency of the operator. 相似文献
67.
The higher incidence of inflammatory diseases in Western countries might be related, in part, to a high consumption of saturated
fatty acids and n−6 polyunsaturated fatty acids (PUFA) and an insufficient intake of n−3 fatty acids. The purpose of this
study was to examine the effects of dietary n−3 fatty acids on innate and specific immune response and their anti-inflammatory
action in models of contact and atopic dermatitis. Balb/C mice were fed for 3 wk either n−6 or n−3 PUFA-fortified diets. After
inducing a contact or an atopic dermatitis, immunological parameters were analyzed to evaluate the anti-inflammatory potential
of these n−3 PUFA. n−3 PUFA reduced innate and specific immune responses through inhibition of TH1 and TH2 responses, increase of immunomodulatory cytokines such as IL-10, and regulation of gene expression. The inhibition of both
kinds of responses was confirmed by the anti-inflammatory effect observed in contact and atopic dermatitis. Reduction in weight,
edema, thickness, leukocyte infiltration, and enhancement of antioxidant defenses in the inflamed ears of mice from both models
along with the prevention of delayed-type hypersensitivity induced in atopic dermatitis proved n−3 PUFA efficacy. Our data
suggest that dietary fish oil-derived n−3 fatty acids have immunomodulatory effects and could be useful in inflammatory disorders. 相似文献
68.
69.
The fundamental requirements for the optimum mechanical interface between a glow discharge ion source and a mass spectrometer are described in this paper. Specifically, the properties of a typical glow discharge ion source are compared and contrasted to those of a typical inductively coupled plasma ion source. The critical parameters and theoretical considerations of glow discharge and inductively coupled plasma ion source interfaces are reviewed, and the results of experiments using both quadrupole and time-of-flight mass spectrometers with a glow discharge source are presented. The experimental results clarify several important problems in the glow discharge ion sampling process. Our findings indicate that a shock wave structure does not occur in the supersonic expansion of the glow discharge ion source. Ions of different masses have similar initial kinetic energies in the glow discharge; thus, the angle of the skimmer cone is not a critical parameter for efficient ion beam extraction. Another consquence is that space charge effects in glow discharge ion sources repel heavy ions farther off axis than light ions. Thus, there are distinct and fundamental differences between glow discharge and inductively coupled plasma ion sources which are relevant to both ion sampling and ion extraction processes. 相似文献
70.