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排序方式: 共有281条查询结果,搜索用时 140 毫秒
1.
Co-operation of the Feynman DIagram ANAlyzer (DIANA) with the underlying operational system (UNIX) is presented. We discuss operators to run external commands and a recent development of parallel processing facilities and an extension in the spirit of a component model. 相似文献
2.
The self-diffusion coefficients of polystyrene dissolved in C6D6 were measured by means of pulsed field gradient n.m.r.. The dependence on the molecular weight was of the power of -2 in accordance with the reptation model. The concentration dependence was theoretically calculated within the blob concept which shows that in the crossover region the self-diffusion coefficient is determined only by the blob dimensions and the monomeric friction coefficient is constant. The calculated concentration dependence agrees well with that observed by the authors. 相似文献
3.
High-strength,high-temperature intermetallic compounds 总被引:1,自引:1,他引:0
R. L. Fleischer 《Journal of Materials Science》1987,22(7):2281-2288
Materials that are solid at high temperatures are in demand for high-temperature structural applications, and materials that have high values of strength-to-weight and stiffness-to-weight are desired for aircraft and space applications. Basic properties that are insensitive to processing history can be used to provide a preliminary ranking of single-phase substances. A compilation is presented of 293 intermetallic compounds (or metal-metalloid compounds) that melt at T 1500° C. By displaying the data by crystal structure on plots ofT
m against the specific gravity candidates for optimum specific strength and specific stiffness can be recognized for materials that are likely to have similar plastic properties. 相似文献
4.
Andreas Ruh Adam-Mwanga Dieckmann Richard Heldele Volker Piotter Robert Ruprecht Christian Munzinger Jürgen Fleischer Jürgen Haußelt 《Microsystem Technologies》2008,14(12):1805-1811
In the field of micro-technology the production of metallic and ceramic micro-components by powder injection molding (PIM)
has become a more and more established fabrication method. But in order to fulfill the demand for more complex-shaped high-precision
micro-components further development work has to be performed. This is especially true if more efficient production routes
for multi-component-micro-assemblies consisting of different materials or sub-components are envisaged. To meet these challenges,
investigations are performed to realize and to establish two primary shape micro-processes. These are two-component micro-injection
molding (2C-MicroPIM) and sinter-joining. The realization of these technologies will lead to a markedly reduction of the efforts
for handling, adjustment, and assembling of metallic and ceramic micro-assemblies. Furthermore, an increased integration level
and functionality can be yielded. For an effective transfer of scientific results to industrial applications the whole process
chain must be considered, from development and construction of the tooling as well as of the components to the quality assurance
and determination of the properties of the assemblies after sintering. These primary shape processes shall enable the mutual
processing of different materials within the fabrication process, so avoiding separate mounting or assembling steps. Additionally
fixed and loose junctions between at least two components shall be realized. The progress in research and development will
be demonstrated especially by the implementation of shaft-to-collar connections between micro-gearwheels and corresponding
shafts. Regarding two-component micro-injection molding, the tool construction for shaft-to-collar connections will be presented
as well as first experimental results on the properties of selected ceramic powders and feedstocks for the special requirements
of the 2C-MicroPIM process. With the assembly step being performed outside the injection molding tool before sinter-joining
different parts and geometries can be combined quite easily. The presented article gives an overview on the concept and on
preliminary testing results for the fabrication of a shaft-to-collar-connection. Additionally, a solution for an automated
assembly of a shaft and a toothed wheel outside the injection molding tool is presented. 相似文献
5.
We describe a compact fiber-optic setup for three-dimensional topometry. The measuring principle is based on low-coherence interferometry in combination with a confocal microscope. Integrating an optical arrangement based on compact disk optics together with fiber optics into one sensor yields a compact unit. The sensor has a numerical aperture of 0.45 and is suitable for measuring large surface slopes with high spatial resolution. Further, a depth measuring range of more than 1 mm can be achieved. The capabilities of our setup for three-dimensional measurements are demonstrated. 相似文献
6.
7.
Sharly Fleischer Yuri Khodorkovsky Erez Gershnabel Yehiam Prior Ilya Sh. Averbukh 《Israel journal of chemistry》2012,52(5):414-437
Spectroscopy aims at extracting information about matter through its interaction with light. However, when performed on gas and liquid phases as well as solid phases lacking long-range order, the extracted spectroscopic features are in fact averaged over the molecular isotropic angular distributions. The reason is that light–matter processes depend on the angle between the transitional molecular dipole and the polarization of the light interacting with it. This understanding gave birth to the constantly expanding field of “laser-induced molecular alignment”. In this paper, we attempt to guide the readers through our involvement (both experimental and theoretical) in this field in the last few years. We start with the basic phenomenon of molecular alignment induced by a single pulse, continue with selective alignment of close molecular species and unidirectional molecular rotation induced by two time-delayed pulses, and lead up to novel schemes for manipulating the spatial distributions of molecular samples through rotationally controlled scattering off inhomogeneous fields and surfaces. 相似文献
8.
9.
The use of light space-frame-structures made of extruded aluminum profiles is a considerable contribution to weight reduction in cars. Individual customer demands as well as new concepts for drives result in splitting the number of pieces into several variants and therefore are increasingly leading to a small batch production of this kind of space-frame-structures. Due to the use of innovative processes and the small batch character of the production, bigger deviations usually occur during the manufacturing of individual profiles. These deviations represent a serious challenge for the precise and automated assembly. In this paper, a method to compensate production related deviations for the assembly of space-frame-structures will be presented. The general approach is the machining of the end segments. During the first step a target structure will be analyzed. Based on this analysis, all profiles are classified according to their degrees of freedom and the associated suitability for compensation. Deviations that occur become visible at an early stage by comparing them with actual measured profile data. Based on this, a strategy for compensating existing deviations can be defined. By implementing the correlations in a flexible environment, an optimization of individual profiles under different basic conditions is therefore possible, and leads to an improved accuracy of the space-frame-structure that needs to be assembled. 相似文献
10.