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1.
Demosthenes Kivotides 《Journal of Low Temperature Physics》2007,148(3-4):287-291
We analyse a numerical solution of a mathematical model of thermal superfluid turbulence. We elaborate on key points of the
statistical phenomenology and point out their impact on fundamental issues of general turbulence theory. 相似文献
2.
Ilias Maglogiannis Demosthenes Vouyioukas Chris Aggelopoulos 《Personal and Ubiquitous Computing》2009,13(1):95-101
This paper presents an integrated system for emotion detection. In this research effort, we have taken into account the fact
that emotions are most widely represented with eye and mouth expressions. The proposed system uses color images and it is
consisted of three modules. The first module implements skin detection, using Markov random fields models for image segmentation
and skin detection. A set of several colored images with human faces have been considered as the training set. A second module
is responsible for eye and mouth detection and extraction. The specific module uses the HLV color space of the specified eye
and mouth region. The third module detects the emotions pictured in the eyes and mouth, using edge detection and measuring
the gradient of eyes’ and mouth’s region figure. The paper provides results from the system application, along with proposals
for further research. 相似文献
3.
Konstantinos Agathos Eleni Chatzi Stéphane P. A. Bordas Demosthenes Talaslidis 《International journal for numerical methods in engineering》2016,105(9):643-677
A variation of the extended finite element method for three‐dimensional fracture mechanics is proposed. It utilizes a novel form of enrichment and point‐wise and integral matching of displacements of the standard and enriched elements in order to achieve higher accuracy, optimal convergence rates, and improved conditioning for two‐dimensional and three‐dimensional crack problems. A bespoke benchmark problem is introduced to determine the method's accuracy in the general three‐dimensional case where it is demonstrated that the proposed approach improves the accuracy and reduces the number of iterations required for the iterative solution of the resulting system of equations by 40% for moderately refined meshes and topological enrichment. Moreover, when a fixed enrichment volume is used, the number of iterations required grows at a rate which is reduced by a factor of 2 compared with standard extended finite element method, diminishing the number of iterations by almost one order of magnitude. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
4.
Lazarou C Karaolis M Matalas AL Panagiotakos DB 《Computer methods and programs in biomedicine》2012,108(2):706-714
Data mining is a computational method that permits the extraction of patterns from large databases. We applied the data mining approach in data from 1140 children (9-13years), in order to derive dietary habits related to children's obesity status. Rules emerged via data mining approach revealed the detrimental influence of the increased consumption of soft dinks, delicatessen meat, sweets, fried and junk food. For example, frequent (3-5times/week) consumption of all these foods increases the risk for being obese by 75%, whereas in children who have a similar dietary pattern, but eat >2times/week fish and seafood the risk for obesity is reduced by 33%. In conclusion patterns revealed from data mining technique refer to specific groups of children and demonstrate the effect on the risk associated with obesity status when a single dietary habit might be modified. Thus, a more individualized approach when translating public health messages could be achieved. 相似文献
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6.
Wayne M. Cranton Sharron L. Wilson Demosthenes C. Koutsogeorgis Richard Hedgley Stephen Lipiec 《Thin solid films》2007,515(24):8534-8538
The feasibility of low-temperature fabrication of transparent electrode elements from thin films of antimony-doped tin oxide (SnO2:Sb, ATO) has been investigated via inkjet printing, rf magnetron sputtering and post-deposition excimer laser processing. Laser processing of thin films on both glass and plastic substrates was performed using a Lambda Physik 305i excimer laser, with fluences in the range 20-100 mJ cm− 2 reducing sheet resistance from as-deposited values by up to 3 orders of magnitude. This is consistent with TEM analysis of the films that shows a densification of the upper 200 nm of laser-processed regions. 相似文献
7.
SA Petropoulos D Daferera CA Akoumianakis HC Passam MG Polissiou 《Journal of the science of food and agriculture》2004,84(12):1606-1610
Essential oils obtained by simultaneous distillation–extraction (SDE) from leaves, petioles and roots of three types of parsley (turnip‐rooted, plain leaf and curly leaf type), sown on three different dates, were analysed by GC‐MS (gas chromatography–mass spectrometry) analysis. Parsley plants were found to produce mainly β‐phellandrene, 1,3,8‐p‐menthatriene, α‐,p‐dimethylstyrene, myristicin, β‐myrcene and apiole. In some cases α‐ and β‐pinene were also found, whereas β‐elemene was detected, especially in the curly leaf type. The growth stage, plant tissue and date of sowing, as well as the climate conditions, all had a significant effect on the essential oil composition by altering the ratio of the above substances. Copyright © 2004 Society of Chemical Industry 相似文献
8.
Christos?Pitsavos Demosthenes?B?PanagiotakosEmail author Christine?Chrysohoou Ioanna?Papaioannou Lambros?Papadimitriou Dimitrios?Tousoulis Christodoulos?Stefanadis Pavlos?Toutouzas 《Nutrition journal》2003,2(1):1
Objectives
In this work we investigated the effect of the consumption of the Mediterranean diet on coronary risk, in subjects with the metabolic syndrome. 相似文献9.
This research explores the design of practice toolkits as components, distinct from community management systems, allowing members of a virtual community to engage in the practice the community is about. Our analysis is informed by two case studies in different application domains each presenting alternative but complementary insights to the design of computer-mediated practice toolkits. The first case study describes how established practices in music performance are encapsulated in a suitably augmented music notation toolkit so as to support the learning objectives of virtual teams engaged in music master classes. The second case study presents experience with the development of a toolkit for engaging in the practice of vacation package assembly. This time the virtual team is a cross-organization virtual community of practice whose members streamline their efforts by internalizing and performing in accordance to a new (virtual) practice. Findings from the two studies reveal two distinct orientations in the design of practice toolkits. Specifically, in application domains where practices are well established (i.e., music performance), the toolkit serves as the medium for reconstructing an existing practice in virtual settings. In contrast, when cross-organization collaboration is involved (i.e., vacation package assembly), the toolkit should be designed so as to encapsulate a “meta”-practice, exhibiting both boundary and locality. 相似文献
10.
This paper advances a proposition for the engineering of interactive computer-based environments capable of exhibiting alternative interactive embodiments to cope with diversity in users, interaction platforms and usage contexts. Such systems are referred to as Multiple Metaphor Environments (MME). The theoretical underpinnings of an MME rely on a conception of HCI design as mapping functions in a machine-oriented language (target domain) to symbols in a user-oriented language (source domain), and vice versa. Such a conception, which is rooted in developments in communication theory and the philosophy of language, constitutes the baseline for formulating a proposal for the design of MME. The proposal comprises a set of engineering principles, process-oriented guidelines and design techniques intended to facilitate a detailed account of how interactive systems could be designed to cope with diversity. To aid the articulation of the various properties of MME, we refer to concrete case studies that provide exemplars of novel insights and promising design practices towards the specification of MME. 相似文献