全文获取类型
收费全文 | 187篇 |
免费 | 0篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 20篇 |
金属工艺 | 5篇 |
机械仪表 | 1篇 |
建筑科学 | 14篇 |
能源动力 | 1篇 |
轻工业 | 88篇 |
石油天然气 | 1篇 |
一般工业技术 | 17篇 |
冶金工业 | 6篇 |
自动化技术 | 32篇 |
出版年
2016年 | 1篇 |
2013年 | 48篇 |
2011年 | 1篇 |
2009年 | 2篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 6篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 7篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 5篇 |
1987年 | 9篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 2篇 |
1983年 | 8篇 |
1982年 | 12篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 4篇 |
1968年 | 3篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1965年 | 1篇 |
1942年 | 1篇 |
排序方式: 共有187条查询结果,搜索用时 46 毫秒
1.
Directional solidification studies of gelatinized corn starch-water mixtures were undertaken in order to examine, in situ, the freezing behavior of this food model. The solidification rate was controlled by varying sample cell velocity as it moved from a 25°C hot stage to a -25°C cold stage. While freezing at cell velocities ≤7.5 μm/sec, starch granules were alternately pushed or entrapped by the advancing solid-liquid interface producing a segregated structure consisting of alternating high-starch and low-starch bands. At a cell velocity of 10 μm/sec, the frozen product was homogeneous. The relationship between the solid-liquid interface velocity and segregation behavior was quantified and compared to an existing model of particle-interface interactions. 相似文献
2.
Lithium chloride yielded better extraction of fish muscle protein than sodium or potassium chloride under most conditions. In addition, constancy of extracted protein was better with lithium compared to potassium or sodium chlorides with respect to blending time, salt concentration, pH, temperature and foaming. With stored red hake muscle, LiCl was superior to NaCl with better extractability of protein and more linear reduction of extractability with storage time. Evidence indicated the superior performance of lithium compared to sodium was due to stabilization by lithium chloride of fish proteins towards denaturation. 相似文献
3.
An integrated system for the acquisition, normalisation and recognition of moving faces in dynamic scenes is introduced. Four face recognition tasks are defined and it is argued that modelling person-specific probability densities in a generic face space using mixture models provides a technique applicable to all four tasks. The use of Gaussian colour mixtures for face detection and tracking is also described. Results are presented using data from the integrated system. 相似文献
4.
MILES PADGETT JOHANNES COURTIAL L. ALLEN SONJA FRANKE-ARNOLD STEPHEN BARNETT 《Journal of Modern Optics》2013,60(5-6):777-785
We calculate the anticipated correlation between measurements of the orbital angular momentum of the signal and idler beams for parametric down-conversion. These calculations apply to the experiments where the orbital angular momentum state is measured by the use of computer-generated holograms. Displacement of these holograms with respect to the beam axis allows the measurement of superpositions of Laguerre—Gaussian modes. The correlations between such superposition modes of the signal and idler beams show their entanglement and could be used for Bell-type tests of nonlocality. 相似文献
5.
The class of exponential smoothing models which vary the values of their parameters to adapt to changing conditions in a time series are referred to as adaptive forecasting techniques. In this article criteria for evaluating forecasting models are presented and the features of a simple exponential smoothing model that are exploited by the adaptive techniques are discussed. Several adaptive forecasting schemes are described and classified, and examples of the performance of these techniques are presented. 相似文献
6.
We use retrodictive quantum theory to describe cavity field measurements by successive atomic detections in the micromaser. We calculate the state of the micromaser cavity field prior to detection of sequences of atoms in either the excited or ground state, for atoms that are initially prepared in the excited state. This provides the POM elements, which describe such sequences of measurements. 相似文献
7.
8.
A limited survey was carried out to determine the nitrosamine content of several varieties of alcoholic beverages (beer and ale, whiskey, wine, cider, etc.) sold in Canada. Of 22 samples of different beers and ales analyzed all but one contained traces of dimethylnitrosamine; the overall mean level found was 1.5 ppb. Only one Canadian rye and one Scotch whiskey out of a total of 13 samples contained traces of either dimethylnitrosamine or diethylnitrosamine. All the 8 wines and 7 cider samples were negative. 相似文献
9.
STEPHEN MUGGLETON 《人工智能实验与理论杂志》2013,25(1):121-130
Abstract Inductive logic programming (ILP) involves the synthesis of logic programs from examples. In terms of scientific theory formation ILP systems define observational predicates in terms of a set of theoretical predicates. However, certain basic theorems indicate that with an inadequate theoretical vocabulary this is not always possible. Predicate invention is the augmentation of a given theoretical vocabulary to allow finite axiomatization of the observational predicates. New theoretical predicates need to be chosen from a well-defined universe of such predicates. In this paper a partial order of utilization is described over such a universe. This ordering is a special case of a logical translation. The notion of utilization allows the definition of an equivalence relationship over new predicates. In a manner analogous to Plotkin, clause refinement is defined relative to given background knowledge and a universe of new predicates. It is shown that relative least clause refinement is defined and unique whenever there exists a relative least general generalization of a set of clauses. Results of a preliminary implementation of this approach are given. 相似文献
10.
DONALD H. HAMMOND STEPHEN M. CROW SANDRA J. HARTMAN 《International journal of systems science》2013,44(11):2255-2260
Clark et al ( 1992)reported on the use of a computer simulation model to show that significant reduction in customer ‘ waiting time’ could be achieved by new management policies for multi-station service organizations. They modelled a multi-phase queuing structure and showed reductions in the system variable ‘ time in system’ when servers were pooled at the first reception desk, rather than having single servers at multiple desks to provide service. Their model also demonstrated a greater savings in system transit time when the servers moved with the customers through subsequent tasks (multi-phase systems) This paper uses classical queuing theory to evaluate these results. We conclude that Clark et al' s findings can be supported through use of the classical waiting line formulas. 相似文献