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排序方式: 共有5100条查询结果,搜索用时 156 毫秒
91.
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This contribution proposes the usage of Liquid Organic Hydrogen Carriers (LOHC) for the storage and subsequently the transport of renewable energy. It is expected that a significant share of future energy consumption will be satisfied with the import of energy coming from regions with high potential for renewable generation, e.g. the import of solar power from Northern Africa to Europe. In this context the transport of energy in form of chemical carriers is proposed supplementary to electrical transmission. Because of their high storage density and good manageability under ambient conditions Diesel-like LOHC substances could be transported within the infrastructure that already exists for the handling of liquid fossil fuels (e.g. oil tankers, tank trucks, pipelines, etc.). A detailed assessment of energy consumption as well as of transport costs is conducted that confirms the feasibility of the concept. 相似文献
94.
The effect of ultra-thin graphite on the morphology and physical properties of thermoplastic polyurethane elastomer composites 总被引:1,自引:0,他引:1
Olivia Menes Manuela Cano Adolfo Benedito Enrique Giménez Pere Castell Wolfgang K. Maser Ana M. Benito 《Composites Science and Technology》2012
Composites of thermoplastic polyurethane (TPU) and ultra-thin graphite (UTG) with concentrations ranging from 0.5 wt.% to 3 wt.% were prepared using a solution compounding strategy. Substantial reinforcing effects with increased loadings are achieved. Compared to neat TPU, values for storage modulus and shear viscosity are enhanced by 300% and 150%, respectively, for UTG concentrations of 3 wt.%. Additionally, an enhancement of thermal properties is accomplished. The crystallization temperature and thermal stability increased by 30 °C and 10 °C, respectively, compared to neat TPU. Furthermore, the use of oxidized UTG (UTGO) with its added functional oxygen groups suggests the presence of chemical interactions between UTG and TPU, which additionally impact on the thermal properties of the corresponding composites. Controlling the oxidation degree, thus offers further possibilities to obtain composites with tailored properties. The presented approach is straightforward, leads to homogeneous TPU-UTG composites with improved materials properties and is especially suitable for commercial UTG materials and further up-scaled production. 相似文献
95.
Aniello Esposito Mauro Ciappa Wolfgang Fichtner 《Microelectronics Reliability》2011,51(9-11):1673-1678
Scanning electron microscopy is still the technique of choice for imaging and for in-line measurement of critical dimensions and overlay accuracy in most of the core technology processes. In particular, critical dimension microscopy provides information about design template matching and edge placement errors through links with design having proven beneficial effects on process yield and product reliability. In this paper, the use of high performance computing is demonstrated to simulate linescans and 2D secondary electron images to be used in optical proximity error correction strategies for nanometer scale technologies. 相似文献
96.
97.
Tiesong Zhao Hanli Wang Sam Kwong C.-C. Jay Kuo Wolfgang A. Halang 《Journal of Visual Communication and Image Representation》2011,22(7):627-633
To enable robust video transmission over heterogeneous networks, the hierarchical B-picture prediction structure is employed in the state-of-the-art video coding standard H.264/SVC, aiming to produce scalable bitstreams with various frame rates. However, the exhaustive mode decision process with the hierarchical B-picture structure increases the computational complexity of H.264/SVC encoding dramatically. In this paper, a fast mode decision algorithm is proposed to speed up H.264/SVC encoding with the hierarchical B-picture structure, which is achieved by utilizing macroblock (MB) features, correlation of temporal–spatial neighboring MBs, and the discrepant characteristics of hierarchical layers. Extensive experimental results demonstrate that the proposed algorithm is able to reduce the encoding time of H.264/SVC significantly for video sequences with a wide range of resolutions, and meanwhile the video quality and compression ratio are well preserved. 相似文献
98.
Klaus Nolte Alexandros Kaloxylos Kostas Tsagkaris Thomas Rosowski Makis Stamatelatos Aristi Galani Eckard Bogenfeld Panagis Magdalinos Jens Tiemann Jens Gebert Paul Arnold Dirk von Hugo Nancy Alonistioti Panagiotis Demestichas Wolfgang Koenig 《International Journal of Network Management》2011,21(5):360-383
Future mobile networks are expected to be complex heterogeneous systems. On the one hand this will enable users to take advantage of a number of different access technologies. On the other hand it will seriously affect network management procedures since more extensive operations and decisions will have to be dealt with. To tackle these challenges a number of new dynamic mechanisms need to be designed. It is imperative that certain network management tasks have to be performed without human intervention to reduce the OPEX costs and achieve faster responses in different events. To achieve this goal, the introduction of self‐x functionalities, combined with cognitive mechanisms and the ability to reconfigure network entities and terminals, is required. Moreover, the introduction of a new pilot channel needs to be considered to assist the terminals in selecting the most suitable radio access technology according to their requirements. We present the functional architecture of an evolved network that was designed in the context of the EU‐funded IP project ‘E3: End‐to‐End Efficiency’. This architecture aims to enhance existing procedures usually performed in traditional operation and maintenance systems (e.g. spectrum management, network planning, configuration actions). We explain the rationale of our design and provide specific examples to illustrate the role of the different functional entities and their interfaces. A considerable part of this architecture has recently been approved as a feasibility study by the ETSI Committee Reconfigurable Radio System. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
99.
Antonio J. Gómez-Núñez Benjamín Vargas-Quesada Félix de Moya-Anegón Wolfgang Glänzel 《Scientometrics》2011,89(3):741-758
In order to re-categorize the SCImago Journal & Country Rank (SJR) journals based on Scopus, as well as improve the SJR subject
classification scheme, an iterative process built upon reference analysis of citing journals was designed. The first step
entailed construction of a matrix containing citing journals and cited categories obtained through the aggregation of cited
journals. Assuming that the most representative categories in each journal would be represented by the highest citation values
regarding categories, the matrix vectors were reduced using a threshold to discern and discard the weakest relations. The
process was refined on the basis of different parameters of a heuristic nature, including (1) the development of several tests applying different thresholds, (2) the designation of a cutoff, (3) the number of iterations to execute, and (4) a manual review operation of a certain amount of multi-categorized journals. Despite certain shortcomings related with journal classification,
the method showed a solid performance in grouping journals at a level higher than categories—that is, aggregating journals
into subject areas. It also enabled us to redesign the SJR classification scheme, providing for a more cohesive one that covers
a good proportion of re-categorized journals. 相似文献
100.
Two paradigmatic approaches to the normalisation of citation-impact measures are discussed. The results of the mathematical
manipulation of standard indicators such as citation means, notably journal Impact Factors, (called a posteriori normalisation)
are compared with citation measures obtained from fractional citation counting (called a priori normalisation). The distributions
of two subfields of the life sciences and mathematics are chosen for the analysis. It is shown that both methods provide indicators
that are useful tools for the comparative assessment of journal citation impact. 相似文献