全文获取类型
收费全文 | 597篇 |
免费 | 22篇 |
专业分类
电工技术 | 2篇 |
综合类 | 1篇 |
化学工业 | 134篇 |
金属工艺 | 44篇 |
机械仪表 | 42篇 |
建筑科学 | 4篇 |
能源动力 | 20篇 |
轻工业 | 27篇 |
石油天然气 | 1篇 |
无线电 | 73篇 |
一般工业技术 | 126篇 |
冶金工业 | 81篇 |
原子能技术 | 7篇 |
自动化技术 | 57篇 |
出版年
2023年 | 2篇 |
2022年 | 9篇 |
2021年 | 16篇 |
2020年 | 9篇 |
2019年 | 15篇 |
2018年 | 17篇 |
2017年 | 18篇 |
2016年 | 13篇 |
2015年 | 17篇 |
2014年 | 23篇 |
2013年 | 48篇 |
2012年 | 54篇 |
2011年 | 47篇 |
2010年 | 31篇 |
2009年 | 25篇 |
2008年 | 31篇 |
2007年 | 24篇 |
2006年 | 15篇 |
2005年 | 23篇 |
2004年 | 11篇 |
2003年 | 20篇 |
2002年 | 13篇 |
2001年 | 15篇 |
2000年 | 9篇 |
1999年 | 12篇 |
1998年 | 38篇 |
1997年 | 23篇 |
1996年 | 9篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有619条查询结果,搜索用时 0 毫秒
81.
Moo-Young Huh Hyun-Chul Kim Jong-Jin Park Olaf Engler 《Metals and Materials International》1999,5(5):437-443
In order to investigate the evolution of through-thickness texture gradients in various ferritic steel sheets, samples of
a deep drawing steel, a ferritic stainless steel and a low carbon steel were deformed by cold rolling with and without application
of a lubricant during the deformation process. The hot band texture of all samples examined showed notable through-thickness
texture gradients. The evolution of the cold rolling texture in the ferritic stainless steel and the low carbon steel in a
solution-treated state was nearly independent of the lubrication during rolling. However, in the deep drawing steel and the
as-received low carbon steel, the lubrication played an important role in the formation of the through-thickness texture gradients.
Whereas the samples rolled with lubrication showed uniform textures throughout the sheet thickness, in the samples rolled
without lubrication pronounced shear textures were observed on the sheet surface. The evolution of these through-thickness
texture gradients is discussed in terms of inhomogeneous strain states computed by an FEM model.
This article is based on a presentation made in the symposium “ ’99 International Symposium on Textures of Materials”, held
at Sunchun National University, Sunchun, April 21–22, 1999 under the auspices of The Korean Institute of Metals and Materials
and The Research and Development Center for Automobile’s Parts and Materials. 相似文献
82.
Effects of work hardening models on low-cycle fatigue evaluations of coiled tubing with CT-100 steel
Tae-Young Ryu Jae-Boong Choi Nam-Su Huh Soo-Chang Kang Ki-Seok Kim 《Journal of Mechanical Science and Technology》2018,32(11):5055-5061
In the present study, low-cycle fatigue life of a coiled tubing (CT) with a CT-100 steel was evaluated by using various work hardening models. Tensile and low-cycle fatigue tests were performed, and experimental results were used to calibrate material model constants. A nonlinear finite element model was constructed in the ABAQUS program by using a CT fatigue test machine. During the test cycles, bending and straightening conditions were repeated and histories of strains were collected. The multiaxial low-cycle fatigue life was calculated by using Manson–Coffin relation and Tresca criterion. The kinematic and combined hardening models can be used to evaluate the fatigue life of CT, and their results are conservative compared with the fatigue test results. Results of the present study can be used as the basic data in establishing CT fatigue analysis. 相似文献
83.
Kunsoo Huh Daegun Hong Jeffrey L. Stein 《Journal of Mechanical Science and Technology》2005,19(11):1998-2006
The lane departure avoidance systems have been considered promising to assist human drivers in AVCS (Advanced Vehicle Control
System). In this paper, a lane departure monitoring and control system is developed and evaluated in the hardware-in-the-loop
simulations. This system consists of lane sensing, lane departure monitoring and active steering control subsystems. The road
image is obtained based on a vision sensor and the lane parameters are estimated using image processing and Kalman Filter
technique. The active steering controller for avoiding the lane departure is designed based on the lane departure metric.
The proposed lane departure avoidance system is realized in a steering HILS (hardware-in-the-loop simulation) tool and its
performance is evaluated with a driver in the loop. 相似文献
84.
Jeung -Soo Huh Jae -Chang Kim Jeong -Ok Lim K. F. Jensen 《Metals and Materials International》1997,3(2):103-107
The growth of high quality ZnSe by organometallic vapor phase epitaxy (OMVPE) has been investigated fortertiary-butyl allyl selenide (tBASe), combined with dimethylzinc-triethylamine (DMZn : NEt3). Single crystalline ZnSe films were grown on GaAs at temperature as low as 350°C with a reasonable growth rate (~1 µm/h). Secondary ion mass spectrometry (SIMS) spectra show a negligible carbon incorporation in ZnSe films from tBASe even at high VI/II ratio, in contrast the carbon concentration of 1021 cm-3 in ZnSe films grown from diallyl selenide (DASe)and methylallylselenide (MASe). Good surface morphology, crystalline and interface quality of ZnSe on (001) GaAs are confirmed by scanning electron microscopy, double crystal diffractometry (DCD) and Rutherford backscattering spectrometry (RBS). Photoluminescence at 10K shows sharp near-band-edge excitonic spectra. 相似文献
85.
Hoon Huh Jin Hyuck Heo Hyoung Wook Lee 《International Journal of Machine Tools and Manufacture》2003,43(4):345-350
This paper is concerned with the optimization of process parameters for a roller leveller that is an indispensable piece of equipment to eliminate the undesirable curvature of a thin-walled aluminum pipe. Optimization of process parameters has been carried out for a multi-staggered-type 14-roller leveller. A finite element model of a multi-staggered 14-roller leveller was constructed for numerical analysis. The analysis is carried out with the fractional model and the Taguchi method for evaluation of the effect of process parameters such as the intermesh and the slanted angle of rollers. The response variable is set to the plastic strain along the pipe length. The optimum combination of process parameters is determined from the numerical result and confirmed by experiments. The comparison of the numerical result with the experimental one shows good coincidence for its validity and reliability. 相似文献
86.
D. Burdette D. Albani E. Chesi N.H. Clinthorne E. Cochran K. Honscheid S.S. Huh H. Kagan M. Knopp C. Lacasta M. Mikuz P. Schmalbrock A. Studen P. Weilhammer 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2009,609(2-3):263-271
Very high resolution images can be achieved in small animal PET systems utilizing solid state silicon pad detectors. As these systems approach sub-millimeter resolutions, the range of the positron is becoming the dominant contribution to image blur. The size of the positron range effect depends on the initial positron energy and hence the radioactive tracer used. For higher energy positron emitters, such as and , which are gaining importance in small animal studies, the width of the annihilation point distribution dominates the spatial resolution. This positron range effect can be reduced by embedding the field of view of the PET scanner in a strong magnetic field. In order to confirm this effect experimentally, we developed a high resolution PET instrument based on silicon pad detectors that can operate in a 7 T magnetic field. In this paper, we describe the instrument and present initial results of a study of the effects of magnetic fields up to 7 T on PET image resolution for and point sources. 相似文献
87.
Huh SH Kim CY Riu DH Taguchi Y Nakajima A 《Journal of nanoscience and nanotechnology》2008,8(4):1959-1964
We have investigated the nanosurface-confined anisotropic growth of ordered-ellipsoidal Fe nanogranules when an Fe plume was deposited at a slanting angle onto an anodized aluminum oxide (AAO) film. Layer-by-layer growth was also investigated. This growth is driven by two critical factors: (1) a new rhombic AAO cell and (2) the slanting deposition of the Fe plume. During slanting deposition, the rhombic AAO cell induces strong restrictions in the nucleation site, growth direction, and granular size; therefore, the degree of freedom during growth is restricted. The magnetic dipoles of the ordered Fe nanogranules are placed along the long axis of the ellipsoid at an angle of 180 degrees (antiparallel) due to the demagnetizing field, shape anisotropy, and magnetic dipole-to-dipole interactions. 相似文献
88.
An effective, efficient, and robust reliability analysis algorithm is proposed for non-linear structures, where seismic loading can be applied in the time domain. The method is developed specifically for steel frame structures considering all major sources of non-linearity, including geometry, material, and partially restrained (PR) connections. The non-linearity due to PR connections is modeled by moment-relative rotation curves using the four-parameter Richard model. For seismic excitation, the loading, unloading, and reloading behavior at PR connections is modeled using moment-relative rotation curves and the Masing rule. The proposed algorithm intelligently integrates the response surface method, the finite element method, the first-order reliability method, and an iterative linear interpolation scheme. The uncertainties in all the random variables including the four parameters of Richard model are considered. Two unique features of the proposed algorithm are that (1) actual earthquake time histories can be used to excite structures in the presence of major sources of non-linearity and uncertainty and (2) it is possible to estimate the risk corresponding to both the serviceability and strength limit states. The algorithm is verified using the Monte Carlo simulation technique. The verified algorithm is first used to study the reliability of a frame structure in the presence of PR connections with different degrees of flexibility. Then the algorithm is used to estimate the reliability of a frame structure excited by 13 actual recorded earthquake time histories, 12 of them recorded during the Northridge earthquake of 1994. As expected, the reliabilities of the frame are found to be quite different, when excited by several time histories of the Northridge earthquake. 相似文献
89.
90.
Phosphorescent OLEDs: Sky‐Blue Phosphorescent OLEDs with 34.1% External Quantum Efficiency Using a Low Refractive Index Electron Transporting Layer (Adv. Mater. 24/2016) 下载免费PDF全文