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排序方式: 共有127条查询结果,搜索用时 15 毫秒
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Markus Lazar Charalampos Anastassiadis 《International Journal of Engineering Science》2006,44(20):1571-1582
In this paper, following Noether’s theorem we investigate Lie point symmetries of linear theories of microstretch elasticity and micromorphic elasticity. We restrict our consideration to isotropic, compatible and homogeneous materials. Conservation and balance laws are derived, thereby extending results from micropolar elasticity. 相似文献
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Assessment of a modification to the Brinell method for determining solid wood hardness 总被引:1,自引:0,他引:1
Charalampos Lykidis Miltiadis Nikolakakos Evaggelos Sakellariou Dimitrios Birbilis 《Materials and Structures》2016,49(3):961-967
Purpose of this study was to assess a modification to the hardness determination method in order to mitigate the effect of visual measurements on the consistency of Brinell method and accuracy of the results. The amendment has been previously proposed by other researchers and refers to the automated determination of indentation diameter and relies on the ability of modern testing machines to accurately measure indentation depth, through which the calculation of indentation diameter is possible. From the results of this study it was shown that the hardness values acquired by the proposed modification presented statistically significant difference compared to those acquired using the visual method described in EN1534 (Wood and parquet flooring—determination of resistance to indentation (Brinell)—test method, 2000). Moreover, compared to the standard methodology, the application of the proposed amendment led to hardness values which are better correlated to density as well as Janka hardness for the six different solid wood species tested. Furthermore, the proposed modification resulted to hardness values which seem to be less affected by the presence of varnish coatings. 相似文献
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Vasilopoulos Ilias Asouti Varvara G. Giannakoglou Kyriakos C. Meyer Marcus 《Engineering with Computers》2021,37(1):449-459
Engineering with Computers - Multi-objective optimization has been rising in popularity, especially within an industrial environment, where several cost functions often need to be considered during... 相似文献
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Hyun‐Cheol Kim Charalampos Z. Patrikakis Nikos Minogiannis Pantelis N. Karamolegkos Alex Lambiris Kyuheon Kim 《ETRI Journal》2006,28(4):411-424
This paper presents a multimedia streaming platform for efficiently transmitting MPEG‐4 content over IP networks. The platform includes an MPEG‐4 compliant streaming server and client, supporting object‐based representation of multimedia scenes, interactivity, and advanced encoding profiles defined by the ISO standard. For scalability purposes, we employ an application‐layer multicast scheme for media transmission using overlay networks. The overlay network, governed by the central entity of the network distribution manager, is dynamically deployed according to a set of pre‐defined criteria. The overlay network supports both broadcast delivery and video‐on‐demand content. The multimedia streaming platform is standards‐compliant and utilizes widespread multimedia protocols such as MPEG‐4, real‐time transport protocol, real‐time transport control protocol, and real‐time streaming protocol. The design of the overlay network was architected with the goal of transparency to both the streaming server and the client. As a result, many commercial implementations that use industry‐standard protocols can be plugged into the architecture relatively painlessly and can enjoy the benefits of the platform. 相似文献
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Grigorios Itskos Pradeep K. Rohatgi Angeliki Moutsatsou John D. DeFouw Nikolaos Koukouzas Charalampos Vasilatos Benjamin F. Schultz 《Journal of Materials Science》2012,47(9):4042-4052
Eight types of A356 Al–fly ash composites were produced by pressure infiltration of high-Ca lignite fly ash. This type of
ash was used for the first time in Al-composites synthesis, and particularly by liquid metal infiltration techniques. After
examining mineralogy and chemistry, specific, narrow ash size fractions were used for the synthesis of composites, and properties
linked to microstructure and wear strength of the materials. The effect of using ground ash particles on the microstructure
and tribological performance of the composites was also investigated. It was concluded that using fine, high-Ca ash particles
can improve the properties of composites, and that using ash particles in a ground form can better facilitate the production
process of MMCs. 相似文献
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Katerina Diamantaki Charalampos Rizopoulos Dimitris Charitos Nikos Tsianos 《Personal and Ubiquitous Computing》2011,15(1):37-49
Multiuser location-aware applications present a new form of mediated communication that takes place within a digital as well
as a physical spatial context. The inherently hybrid character of locative media use necessitates that the designers of such
applications take into account the way communication and social interaction is influenced by contextual elements. In this
paper, an investigation into the communicational and social practices of users who participate in a location-based game is
presented, with an emphasis on group formation and dynamics, interpersonal communication, and experienced sense of immersion.
This investigation employs a methodological approach that is reliant on both qualitative and quantitative data analysis. A
series of this user experience study’s results are presented and discussed. 相似文献
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Vasilopoulos Nicholas L.; Cucina Jeffrey M.; McElreath Julia M. 《Canadian Metallurgical Quarterly》2005,90(2):306
This article presents the results of 2 studies that examine the effect of presenting a warning of response verification by others on the relationship between measures of personality and cognitive ability. In both a field study and a laboratory study, stronger correlations were generally found between measures of personality and cognitive ability when a warning of verification was present. The results from the studies also showed that the warning of verification was associated with slower item response latencies for certain personality scales, suggesting that exposure to the warning increased the complexity of the response decision. Results are discussed in terms of the effects of altering test instructions on the construct validity of personality measures used in applied settings. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献