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1.
Guanyao Huang Ashwin Lall Chen-Nee Chuah Jun Xu 《Journal of Network and Systems Management》2011,19(1):84-110
Discovering icebergs in distributed streams of data is an important problem for a number of applications in networking and
databases. While previous work has concentrated on measuring these icebergs in the non-distributed streaming case or in the
non-streaming distributed case, we present a general framework that allows for distributed processing across multiple streams
of data. We compare several of the state-of-the-art streaming algorithms for estimating local elephants in the individual
streams. However, since an iceberg may be hidden by being distributed across many different streams, we add a sampling component
to handle such cases. We provide a novel taxonomy of current sketches and perform a thorough analysis of the strengths and
weaknesses of each scheme under various QoS metrics, using both real and synthetic Internet trace data. We summarize their
performance and discuss the implications for the future design of sketches. 相似文献
2.
Carlos A. Montoya Jean-Paul Lallès Stephen Beebe Pascal Leterme 《Food research international (Ottawa, Ont.)》2010,43(2):443-449
This article proposes a new way to improve the protein quality of the common bean (Phaseolus vulgaris). It is based on the natural variability found in the different types of phaseolin, its main storage protein (40–50% of the total protein). Despite the fact that it is deficient in methionine content, phaseolin still represents the main source of that amino acid in the seed. More than 40 genetic variants, differing in subunit number (2–6) and molecular weight (40–54 kDa) have been analyzed. The similarity of the amino acid composition among phaseolins, suggests that a nutritional improvement cannot be expected from that side. Conversely, important variation in phaseolin susceptibility to proteolysis (ranging from 57% to 96% after cooking) has been observed, increasing the theoretical availability of methionine by up to 37%. Therefore, breeding programs based on highly-digestible phaseolin types could lead to the production of beans with higher protein quality. 相似文献
3.
4.
The assembly-level reliability of the 0.8 mm pitch flex-substrate BGA, 0.65 mm pitch elastomer-on-flex package, and 0.5 mm pitch partial array BGA has been characterized in thermal fatigue, out-of-plane deformation, low frequency repeated bending, and thermal aging. Non-linear finite element models have been used to identify and predict the dominant failure mechanisms and identify the assembly parameters which have a dominant impact on reliability. The model predictions have been verified with accelerated test data. The results have been bench marked against other technologies including 1.5 mm pitch OMPACTM and 1 mm pitch, 196 I/O Glob-top BGA. 相似文献
5.
Sjofn Sigurgisladottir Santosh P. Lall Christopher C. Parrish Robert G. Ackman 《Lipids》1992,27(6):418-424
Salmonid fish require long-chain n−3 fatty acids in their diet. The digestibility of different chemical forms of fish oil
fatty acids, fed as triacylglycerols, free fatty acids or ethyl esters, was examined in 300 g farmed Atlantic salmon (Salmo salar) using cholestane as an indicator of fat absorptionin lieu of the chromium oxide (Cr2O3) which is commonly used as a marker in digestibility studies. It was established that the two digestibility markers gave
similar results. Conveniently, cholestane does not require a separate analysis if fatty acids are to be determined by appropriate
gas-liquid chromatography. The long-chain polyunsaturated fatty acids were particularly well absorbed, the apparent digestibility
being 90–98% when feeding triacylglycerols or free fatty acids. However, the digestibility of monounsaturated fatty acids
(75–94%) was lower, and lower still for saturated fatty acids (50–80%). Ethyl esters of fatty acids were significantly less
well absorbed (P<0.05) than were the corresponding fatty acids in free acid or triacylglycerol form. Irrespective of dietary fat type, only
free fatty acids were identified in feces, indicating total hydrolysis of triacylglycerols and ethyl esters.
Presented in part at the World Aquaculture Society meeting, June 10–14, 1990, Halifax, Canada. 相似文献
6.
This study evaluated the sexual knowledge (including contraceptive and reproductive knowledge), contraceptive use, and self-esteem among a sample of 158 male and female United States Navy sailors assigned to Navy ships. In spite of the fact that men and women viewed themselves as relatively knowledgeable with respect to contraception, results showed substantial knowledge deficits. Women demonstrated significantly greater sexual knowledge than men, and contraceptive/ reproductive knowledge was highly correlated with self-reported use of contraceptives. Finally, self-esteem was highly correlated with sexual knowledge and certain contraceptive use behaviors. 相似文献
7.
ABSTRACT: Conjugated linoleic acid (CLA) is found naturally in dairy and beef products at levels of 0.2% to 2% of the total fat. A more concentrated source of dietary CLA, low in saturated fat, would be highly desirable to obtain optimum CLA levels of about 3 g/d. We recently reported photoisomerization of soy oil with iodine catalysis to be a simple way of producing CLA in laboratory without high-energy input or expensive enzymes and microorganisms. However, a long irradiation time of 144 h has been a limitation for this technique to be of practical value. The objectives of this study were to build a pilot plant unit to rapidly produce high-CLA soy oil by photoirradiation and optimize the processing parameters to obtain high-CLA soy oil. Degassed oil with dissolved-iodine catalyst was irradiated by UV lamps in an illuminated laminar flow unit (ILFU). The ILFU consists of 2 borosilicate glass plates in a silicone lined stainless steel frame. The static mode of operation yielded 5.7% of total CLA isomers and performed twice as well than the continuous mode with 2.5% of total CLA. Irradiating oil in a static mode with reflective surfaces increased the CLA yields 3-fold to 16.4%. About 22% of total CLA isomers can be rapidly produced from soy oil linoleic acid with 0.35% iodine catalyst in a 0.5-cm-thick oil layer maintained at 48 °C for 12 h. The peroxide value and GC-MS analysis did not identify any volatile compounds characteristic of lipid oxidation. This study is a definitive step toward the commercialization of large-scale production of CLA-rich soy oil. 相似文献
8.
Pattern Analysis and Applications - A feature based on a single modality such as color or texture is not sufficient to investigate the appearance variation across multiple images. In this paper, a... 相似文献
9.
In this paper new techniques are developed for the analysis of linear time-varying (LTV) systems. These lead to a formally simple treatment of robust control problems for LTV systems, allowing methods more usually restricted to time invariant systems to be employed in the time-varying case. As an illustration of this methodology, the so-called H∞ synthesis problem is solved for LTV systems 相似文献
10.
Influence of Surface Segregation on Wetting of Sn-Ag-Cu (SAC) Series and Pb-Containing Solder Alloys
M. J. Bozack J. C. Suhling Y. Zhang Z. Cai P. Lall 《Journal of Electronic Materials》2011,40(10):2093-2104
Wetting of Sn-Ag-Cu (SAC) series solder alloys to solid substrates is strongly influenced by surface segregation of low-level
bulk impurities in the alloys. We report in situ and real-time Auger electron spectroscopy measurements of SAC alloy surface compositions as a function of temperature as
the alloys are taken through the melting point. A dramatic increase in the amount of surface C (and frequently O) is observed
with temperature, and in some cases the alloy surface is nearly 80 at.% C at the melting point. The C originates from low-level
impurities incorporated during alloy synthesis and inhibits wetting because C acts as a blocking layer to reaction between
the alloy and substrate. A similar phenomenon has been observed over a wide range of (SAC and non-SAC) alloys synthesized
by a variety of techniques. That solder alloy surfaces at melting have a radically different composition from the bulk uncovers
a key variable that helps to explain the wide variability in contact angles reported in previous studies of wetting and adhesion. 相似文献