全文获取类型
收费全文 | 66篇 |
免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 6篇 |
金属工艺 | 3篇 |
机械仪表 | 1篇 |
能源动力 | 1篇 |
轻工业 | 2篇 |
无线电 | 44篇 |
一般工业技术 | 3篇 |
冶金工业 | 1篇 |
自动化技术 | 5篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2015年 | 1篇 |
2013年 | 6篇 |
2012年 | 1篇 |
2011年 | 2篇 |
2010年 | 4篇 |
2009年 | 5篇 |
2008年 | 3篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有67条查询结果,搜索用时 0 毫秒
1.
The aim of this work is to study the reaction of ozone and combined ozone/hydrogen peroxide mixtures with the fluorescent brightener 28 in dilute aqueous solution using controlled experimental conditions. The kinetics were also evaluated under various experimental conditions. The main ozonation by-products have been identified by High Pressure Anionic Exchange Chromatography (HPAEC) and Gas Chromatography coupled with Mass Spectrometry (GC-MS) techniques and a reaction pathway is proposed. In order to confirm this mechanism, melamine and s-triazine have been treated under the same reaction conditions and their decomposition pathways were studied. 相似文献
2.
Abstract: Managing multiple ontologies is now a core question in most of the applications that require semantic interoperability. The semantic web is surely the most significant application of this report: the current challenge is not to design, develop and deploy domain ontologies but to define semantic correspondences among multiple ontologies covering overlapping domains. In this paper, we introduce a new approach of ontology matching named axiom-based ontology matching. As this approach is founded on the use of axioms, it is mainly dedicated to heavyweight ontologies, but it can also be applied to lightweight ontologies as a complementary approach to the current techniques based on the analysis of natural language expressions, instances and/or taxonomical structures of ontologies. This new matching paradigm is defined in the context of the conceptual graphs model, where the projection (i.e. the main operator for reasoning with conceptual graphs which corresponds to homomorphism of graphs) is used as a means to semantically match the concepts and the relations of two ontologies through the explicit representation of the axioms in terms of conceptual graphs. We also introduce an ontology of representation, called MetaOCGL, dedicated to the reasoning of heavyweight ontologies at the meta-level. 相似文献
3.
The microstructure of a Ti–48Al alloy cooled after a solution treatment in the -field is influenced by the cooling rate. In order to characterize the lamellar structure and to know the values of 2-volume fraction, width of 2-lamellae, and interlamellar spacing, we developed a method of measurement based on an observation of laths in the scanning electron microscope. The study revealed the heterogeneous distribution of the lamellar structure in a commercial purity Ti–48Al alloy cooled from the -field at a rate of 35°C/min. The evolution of 2-volume fraction with the cooling rate showed that the microhardness is determined by the quantity of 2-phase. The values of yield stress also increased and were all the less scattered as the structure became more perfectly lamellar. Yield stress and interlamellar spacing are linked by a Hall–Petch relation. 相似文献
4.
Diederik Verkest Julio Leao Da Silva Jr. Chantal Ykman Kris Croes Miguel Miranda Sven Wuytack Francky Catthoor Gjalt De Jong Hugo De Man 《The Journal of VLSI Signal Processing》1999,21(3):185-194
MATISSE is a design environment intended for developing systems characterized by a tight interaction between control and data-flow behavior, intensive data storage and transfer, and stringent real-time requirements. Matisse bridges the gap from a system specification, using a concurrent object-oriented language, to an optimized embedded single-chip hardware/software implementation. Matisse supports stepwise exploration and refinement of dynamic memory management, memory architecture exploration, and gradual incorporation of timing constraints before going to traditional tools for hardware synthesis, software compilation, and inter-processor communication synthesis. With this approach, specifications of embedded systems can be written in a high-level programming language using data abstraction. Application of MATISSE on telecom protocol processing systems in the ATM area shows significant improvements in area usage and power consumption. 相似文献
5.
Min Li Bruno Bougard Liesbet Van Der Perre Francky Catthoor 《Journal of Signal Processing Systems》2009,56(2-3):327-340
The flexibility and programmability of SDR come at the expense of reduced efficiency and increased energy consumption. This is usually considered as the penalty of SDR. However, the flexibility and programmability have great potentials for improving the system-wide efficiency if they are properly exploited. In this paper, we present a HSDPA chip equalizer that is explicitly designed for SDR implementations. The first SDR-specific feature of our work is the multi-mode operation based on heterogeneous algorithms. The proposed equalizer combines an optimized LMS variant (with subspace-aware extension) and an optimized SRI-RLS algorithm based on QRD. Instead of always applying the powerful SRI-RLS algorithm, the equalizer switches to simple LMS-variant when possible. With negligible BER degradation, the multi-mode operation can reduce 60% of the cycle-count on TI TMS320C6713 for 3GPP case 4 with 16QAM modulation. The proposed equalizer framework also incorporates a generic, robust and efficient scheme for equalization-length adaptation. The length-adaptation scheme can make very fast run-time decision based on an efficient policy-template, which is optimized with large training set at design time. We test 14 representative channel profiles specified in ITU-R M.1225, 3GPP TR 25.943 and 3GPP TS 25.101. Comparing to worst-case based design the length-adaptation achieves more than 10× cycle-count reductions for ten of the cases. 相似文献
6.
7.
Bert Geelen Vissarion Ferentinos Francky Catthoor Spyridon Toulatos Gauthier Lafruit Thanos Stouraitis Rudy Lauwereins Diederik Verkest 《Journal of Signal Processing Systems》2009,56(2-3):125-139
In the context of future dynamic applications, systems will exhibit unpredictably varying platform resource requirements. To deal with this, they will not only need to be programmable in terms of instruction set processors, but also at least partial reconfigurability will be required. In this context, it is important for applications to optimally exploit the memory hierarchy under varying memory availability. This article presents a mapping strategy for wavelet-based applications: depending on the encountered conditions, it switches to different memory optimized instantations or localizations, permitting up to 51% energy gains in memory accesses. Systematic and parameterized mapping guidelines indicate which localization should be selected when, for varying algorithmic wavelet parameters. The results have been formalized and generalized to be applicable to more general wavelet-based applications. 相似文献
8.
Min Li David Novo Bruno Bougard Claude Desset Antoine Dejonghe Liesbet Van Der Perre Francky Catthoor 《Journal of Signal Processing Systems》2011,63(1):13-25
The fast pacing diversity and evolution of wireless communications require a wide variety of baseband implementations within
a short time-to-market. Besides, the exponentially increased design complexity and design cost of deep sub-micron silicon
highly desire the designs to be reused as much as possible. This yields an increasing demand for reconfigurable/ programmable
baseband solutions. Implementing all baseband functionalities on programmable architectures, as foreseen in the tier-2 SDR,
will become necessary in the future. However, the energy efficiency of SDR baseband platforms is a major concern. This brings
a challenging gap that is continuously broadened by the exploding baseband complexity. We advocate a system level approach
to bridge the gap. Specifically, we fully leverage the advantages (programmability) of SDR platforms to compensate its disadvantages
(energy efficiency). Highly flexible and dynamic baseband signal processing algorithms are designed and implemented to exploit
the abundant dynamics in the environment and the user requirement. Instead of always performing the best effort, the baseband
can dynamically and autonomously adjust its work load to optimize the average energy consumption. In this paper, we will introduce
such baseband signal processing techniques optimized for SDR implementations. The methodology and design steps will be presented
together with 3 representative case studies in HSDPA, WiMAX and 3GPP LTE. 相似文献
9.
Sven Verdoolaege Martin Palkovič Maurice Bruynooghe Gerda Janssens Francky Catthoor 《Journal of Electronic Testing》2010,26(2):279-292
The application of loop and data transformations to array and loop intensive programs is crucial to obtain a good performance.
Designers often apply these transformations manually or semi-automatically. For the class of static affine programs, automatic
methods exist for proving the correctness of these transformations. Realistic multimedia systems, however, often contain constructs
that fall outside of this class. We present an extension of a widening based approach to handle the most relevant of these
constructs, viz. accesses to array slices, data dependent accesses and data dependent assignments, and report on some experiments
with non-trivial applications. 相似文献
10.
Many Fourier transform applications have to operate at fixed sample rates in the low to medium range, especially in signal processing systems. Hence, in order to arrive at efficient implementations, hardware-sharing is required as in microcoded architectures. In this paper, very efficient application-specific realizations spanning a wide throughput range are proposed for both DFT and FFT algorithms. Novel single-cycle address computations are presented for the FFT to obtain these results. Trade-offs between the architectural alternatives are provided too. These designs have been used as test-vehicles for the architectural strategy in an automated synthesis tool-box tuned towards signal processing applications.This research has been sponsored in part within the context of the ESPRIT97 project by the EC and the industrial partners Philips, Siemens, BTMC/Alcatel and Silvar/Lisco. 相似文献