212 research outputs found
Molecule Statistical Thermodynamics Simulation of Nanoindentation of Single Crystal Copper with EAM Potential
No full textThe quasistatic nanoindentation process of a spherical indenter in a single crystal copper is investigated with the molecular statistical thermodynamics (MST) method based on the embedded atom method (EAM) potential. The indentation modulus obtained in the MST simulation is 129.9GPa, which agrees well with the theoretical prediction (129GPa). In the elastic regime, the obtained maximum displacement of the indenter is two times the contact depth and the contact area is qualitatively proportional to the contact depth, which agrees well with Hertzian elastic theory of contact. The MST simulation can reproduce the nucleation of dislocation as well. Moreover, the efficiency of the MST method is about 8 times higher than that of traditional MD simulations
Functional and field performance of epoxy asphalt technology-state-of-the-art
No full textThere is an increasing demand for high strength and more durable materials in the asphalt technology market. In response to the demand, epoxy asphalt mixture (EAM) is one relatively new technology for use as a paving material in flexible pavements. There are various research works carried out on the laboratory and field performance of EAM. However, comprehensive research covering functional and field (F&F) performance of EAM is lacking. The main purpose of this review is to bridge this gap via the analysis of the functional properties of EAM. Consequently, the field performance of EAM in different case studies is reviewed and the serviceability of EAM in various transportation infrastructure is investigated. This paper also reviews the life cycle cost and maintenance of EAM. The major findings indicate that EAM shows superior F&F performance compared to the traditional hot and warm asphalt mixture. Additionally, the use of EAM is beneficial in the structure of pavements in tunnels and on bridge decks. In conclusion, the higher F&F performance of EAM supports the development of better performing pavements for various applications
The Reproducibility of Reference Landmarks in the External Acoustic Meatus (EAM) on Cone Beam Computed Tomography (CBCT) Images
No full textObjective: The aim of the present study is to identify a more reliable reference point in three-dimensional cephalometric analysis to replace the Porion point used in two-dimensional analysis, enhancing the accuracy of assessments. Methods: The methodology assessed potential alternative landmarks for three-dimensional cephalometric analysis. Utilizing a segmenting technique, anatomical landmarks were accurately pinpointed from the external acoustic meatus of 26 Cone Beam Computed Tomography (CBCT) scans. These landmarks were chosen for their clear and unambiguous detectability. To assess reproducibility, each landmark was replicated twice with a one-week interval by a master’s student. Reproducibility was quantitatively evaluated by analyzing the absolute difference per axis. Results: Five possible candidate landmarks were identified: the most anterior, posterior, superior, and inferior points of the external acoustic meatus (EAM) and a notch delineating the epitympanic recess. The reproducibility of pinpointing these landmarks ranged from 0.56 mm to 2.2 mm. The absolute mean differences between measurements were 0.46 mm (SD 0.75) for the most anterior point, 0.36 mm (SD 0.44) for the most posterior point, 0.25 mm (SD 0.26) for the most superior point, 1.11 mm (SD 1.03) for the most inferior point, and 0.78 mm (SD 0.57) for the epitympanic notch. Conclusions: The most superior point of the EAM might successfully replace the Porion as an anatomical reference.</p
Open Data in Engineering Asset Management: A Case Study into the possibilities and challenges of using Open Data in Engineering Asset Management
No full textThe use of Open Data (OD) in an Engineering Asset Management (EAM) context is largely unexplored. Even though research into OD is moving forward, this knowledge is not fully usable in EAM because of the complexity and the specific characteristics of EAM. The research is centred around the case study that has taken place. As input for the case study, a literature review has been conducted to summarize and analyse the existing knowledge of OD and EAM. This created a starting point for the case study. A case about the traffic situation around the IJsselbruggen and the VIA15 project (A12) has been selected to research the possibilities to use OD with the goal to evaluate the current traffic measures and investigate the possibilities for Data-Driven Decision Making (DDDM). The combined results of the literature review and the case study have been reviewed by a group of experts in an expert workshop session. Besides there critical opinion about the research, the experts where also asked about their view on the use of OD in the EAM sector.Engineering and Policy Analysi
GeSn/SiGeSn Multiple-Quantum-Well Electroabsorption Modulator With Taper Coupler for Mid-Infrared Ge-on-Si Platform
No full textWe propose a taper coupler electroabsorption modulator (EAM) composed of GeSn/SiCeSn multiple-quantum-well (MQW) on Ge-on-Si platform for mid-infrared (2 mu m) integrated optical active devices. The epitaxial design is performed by calculating the absorption spectra of GeSn/SiGeSn MQW using many-body theory to investigate the extinction characteristics of GeSn MQW waveguides. Two types of taper couplers are considered for connecting Ge-rib waveguide and GeSn-MQW-highmesa waveguide efficiently. One is an adiabatic taper coupler (ATC) type EAM and it is useful for thin Ge-buffer structure in terms of the extinction ratio. Another is a resonant taper coupler (RTC) type EAM and it is superior to ATC type EAM for thick Ge-buffer. It is confirmed that RTC type EAM can obtain the high extinction characteristics with low-loss and shorter device length (6.87 dB, -3.97 dB, and 215 mu m) compared with conventional ATC type EAM for thick Ge-buffer (5.67 dB, -4.9 dB, and 340 mu m)
Dangerous Liaisons: Relationships between design, craft and art
No full textThe introductory essay [co-authored] examines the background and current interconnections between design, craft and the fine arts. This Special Issue was able to expand the debate by showing how attitudes to materials – from 19C sculpture to current fashion – appropriate craftsmanship to reinvigorate notions of handmaking
Keeping the head straight:Standardizing reference plane orientation in CBCT scans for accurate assessment
No full textThis thesis investigates how to improve the accuracy and reliability of three-dimensional (3D) cephalometric analysis by developing a new reference plane for orienting CBCT scans. Across five studies, the research evaluates anatomical landmarks in the external acoustic meatus (EAM), examines their symmetry, and introduces the ACTA plane as a novel alternative to the traditional Frankfurt Horizontal (FH) plane.The first studies focused on identifying consistent landmarks within the EAM. Among the evaluated points, the most superior point (MSP) proved to be the most reliable, while the most inferior point (MIP) and the epitympanic notch (EN) showed greater variability due to their complex anatomy. Automated segmentation improved visualisation but also highlighted limitations in distinguishing subtle structures.Next, the symmetry of the EAM was assessed. The EAM was found to be largely symmetric, supporting the MSP as a potential reference for 3D imaging. A new coordinate system was introduced to reduce variability caused by CBCT scanner positioning, enabling more accurate comparison between left and right cranial structures.The ACTA plane was then developed using internal midsagittal references and external orbital points, avoiding reliance on the Porion—an inconsistent landmark in 3D imaging. Reorienting scans with the ACTA plane improved examiner reliability, particularly for landmarks traditionally difficult to locate.Finally, the ACTA plane was compared to the FH plane. Both produced similar angular orientations, but the FH plane was less stable due to challenges in identifying Porion3D. The ACTA plane therefore offers a more reproducible alternative for 3D skull orientation.Overall, this thesis supports the ACTA plane as a promising new standard for CBCT orientation in 3D cephalometry
Brothers in Arms. The National Liberation Front (EAM) and the Jews of the Greece
No full textThe book is an attempt to describe the relationship between the Eamic resistance movement and the Jewish element of Greece during the Occupation and is formed around the following themes: contacts of Jewish and Eamic resistance organizations from the beginning of the Occupation, contacts during the period of persecution, the grounded experience of survival in Free Greece, the persecution of Jews as communists during the Civil War. The presence of Jews in ELAS is studied separately as a pre-eminent condition for the formation of a resistance Jewish identity. In an attempt to assemble the divergent stories - and periodicals - of the Resistance and the Holocaust into a coherent narrative, the study attempts to outline the participation of Jews in the Eamic Resistance, to record and evaluate in their local and temporal context, specific actions of the EAM during of racial persecution and discuss issues of identity, ideology and memory. The book is both a product of archival and bibliographic research, as well as a study of oral testimonies, part of which were collected by the author himself in the framework of the periodical exhibition "Competitor. Greek Jews in the National Resistance "of the Jewish Museum of Greece (EME), 2014-2015, which he curated
Pneumococcal disease in the Netherlands : Background information for the Health Council of the Netherlands
No full textDe pneumokok is de belangrijkste veroorzaker van ernstige infecties als longontsteking, bloedvergiftiging en hersenvliesontsteking. Deze infecties komen het meest voor bij ouderen en bij kinderen onder de vijf jaar. Bij ouderen is longontsteking verreweg de belangrijkste ziekte. In Nederland krijgen ongeveer 10.000 patiënten per jaar een ernstige pneumokokkeninfectie en hebben vooral ouderen een hoge kans om hieraan te overlijden (10 tot 15 procent). Het ministerie van VWS heeft de Gezondheidsraad gevraagd een advies uit te brengen over pneumokokkenvaccinatie om de ziektelast van pneumokokkenziekte bij ouderen te verminderen. Daartoe heeft het RIVM de momenteel beschikbare wetenschappelijke informatie over deze ziekte bijeengebracht. Het gaat onder meer om het aantal mensen dat ziek wordt van pneumokokken in Nederland, en de effectiviteit en veiligheid van verschillende pneumokokkenvaccins bij kinderen en ouderen. Er zijn twee pneumokokkenvaccins geregistreerd voor ouderen; een vaccin dat tegen dertien typen beschermt en een vaccin tegen 23 typen. Sinds 2006 worden zuigelingen binnen het Rijksvaccinatieprogramma (RVP) gevaccineerd tegen pneumokokkenziekte. De vaccinatie richtte zich eerst tegen zeven typen en sinds 2011 tegen tien typen. Door deze vaccinatie is pneumokokkenziekte bij kinderen sterk afgenomen. Vaccinatie van kinderen heeft ook invloed op de mate waarin pneumokokkentypen bij ouderen voorkomen. Hierdoor is het aantal ouderen dat ziek wordt van typen waartegen kinderen worden gevaccineerd, afgenomen. Het aantal zieke ouderen door typen pneumokken die niet zijn opgenomen in het vaccin voor kinderen, is echter toegenomen. Hierdoor is het aantal zieke ouderen nog steeds hoog.Pneumococci are the key pathogens causing severe infections such as pneumonia, septicaemia and meningitis. These infections are commonest in elderly people and in children aged under five. Among elderly people, pneumonia is by far the most significant disease. In the Netherlands, about 10,000 patients a year get a severe pneumococcal infection and elderly people in particular have a high risk of this infection being fatal (10 to 15 per cent). The Dutch Ministry of Health, Welfare and Sport has asked the Health Council of the Netherlands to provide recommendations about vaccinations against pneumococci in order to reduce the burden of pneumococcal disease among elderly people. To that end, the National Institute for Public Health and the Environment (RIVM) has collated the scientific information that is currently available about this disease. This includes the number of people who are made ill by pneumococci in the Netherlands and the effectiveness and safety of various pneumococcal vaccines in children and in elderly people. Two pneumococcal vaccines are licensed for use in elderly people, one vaccine that protects against thirteen types and one against 23 types. Since 2006, the national immunisation programme (NIP) has vaccinated infants against pneumococcal disease. This vaccination was against seven types at first, and has been expanded to ten since 2011. These vaccinations have greatly reduced pneumococcal disease among children. Vaccinating children also has an effect on the extent to which various types of pneumococcus are found in elderly people. As a result, there has been a reduction in the number of elderly people who are falling ill from the types of pneumococcus that children are vaccinated against. There has, however, been an increase in the number of elderly people falling ill from types of pneumococcus that have not been included in the vaccine for children. Consequently, the number of sick elderly people is still high.Ministerie van VWS ; Gezondheidsraa
Describing the “Integrated” in Integrated Ecosystem Assessments
No full textNo abstracts are to be cited without prior reference to the author. Within the Theme Session: “One size does not fit all – what does an Integrated Ecosystem Assessment mean to YOU?”, multiple perspectives on, approaches to, and interpretations of an integrated ecosystem assessment (IEA) and its components as a key element and foundation for an ecosystem approach to management (EAM), will be presented and discussed. This submission by the session coconveners will serve as an introductory and overview presentation, and will: 1) Examine the role of IEA in EAM. 2) Explore the relationship of 'integrated' ecosystem assessments with and in contrast to more narrow thematic or sectoral assessments towards fully implemented EAM through IEA. This analysis will consider several potential stages of integration, including human dimensions (socio-economic) aspects. We will consider the role of thematic and sector-based assessments within an integrated assessment and suggest an iterative process for IEA production and application towards full EAM
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