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Search Results: 1 - 10 of 15194 matches for " Marco Ezechieli "
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Injury rates of the German Women’s American Football National Team from 2009 to 2011
Marco Ezechieli,Stephan Berger,Christian-Heige Siebert,Oliver Miltner
Orthopedic Reviews , 2012, DOI: 10.4081/or.2012.e28
Abstract: American football is one of the leading causes of athletic-related injuries. Injury rates in female elite players are mostly unknown. We hypothesized that the injury rates of female was comparable to those in men’s football during practice, as well as games. From 2009 to 2011, injury data were collected from the German female national team during training camps, World Championship 2010 and International friendly matches. The injury was categorized by location on the body and recorded as fracture/dislocation, strain, concussion, contusion or other injury. Injury rates were determined based on the exposure of an athlete to a game or practice event. The injury rate was calculated as the ratio of injuries per 1000 athlete exposures (AE). The rate of injury was significantly higher during games (58.8/1000 AE) than practices [16.3/1000 AE, (P<0.01)]. Furthermore, the injury rate in the tryouts was significantly higher (24.05/1000 AE) compared to other training sessions with the national team (11.24/1000 AE). Our findings show that the injury rates in female elite American football players can be compared to those described for male players. Higher injury rates during matches than in training should also be underlined.
Peri-Urban Transformations in Agricultural Landscapes of Perugia, Italy  [PDF]
Marco Vizzari
Journal of Geographic Information System (JGIS) , 2011, DOI: 10.4236/jgis.2011.32011
Abstract: Urban fringes represent very complex landscapes because of their proximity and mutual dependency with cities and rural areas. These landscapes may be considered as transition entities characterized by fuzzy boundaries. An uncontrolled development of urban sprawl and land use changes in these areas may deter- mine negative impacts on all natural, economic and social components. Thus, urban fringes assume a key-role in modern landscape analysis, planning and management. Landscape analysis of these interfaces, as this study shows, can be effectively supported by GIS spatial modelling. The Settlement Density Index (SDI), developed through GIS spatial analysis techniques, expresses punctually the territorial gradients generated by the presence of settlements and allows the identification of the urban fringes in the two periods under invest-tigation. These areas are then characterized and analyzed quantitatively using detailed land use data. The comparison of the diachronic information highlights the transformations of peri-urban landscapes that appear mainly related to the modifications of spatial configuration of urban areas and to the changes of agricultural systems.
Multiple Lorentz Groups—A Toy Model for Superluminal Muon Neutrinos  [PDF]
Marco Schreck
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.310177
Abstract: In this article an idea is presented, which allows for the explanation of superluminal muon neutrinos. It is based on the introduction of a new superluminal, massless gauge boson coupling to the neutrino only, but not to other standard model particles. The model is discussed with regard to the Supernova 1987 (SN 1987) velocity bound on electron antineutrinos and the Cohen-Glashow constraint on superluminal neutrino propagation. The latter can be circumvented if— within the framework of the model—a sterile neutrino mixing with the active neutrino mass eigenstates is introduced. The suggestion of a sterile neutrino accounting for superluminal neutrinos has already been proposed in several papers. It is possible to choose mixing angles with the sterile neutrino sector such that the model respects both the SN 1987 bound and the muon neutrino travels superluminally.
Concept for Floating and Submersible Wireless Sensor Network for Water Basin Monitoring  [PDF]
Marco Allegretti
Wireless Sensor Network (WSN) , 2014, DOI: 10.4236/wsn.2014.66011
It will show the feasibility of a Wireless Sensor Network (WSN) devoted to monitoring water basin, river, lake, and sea both on the surface and in depth. The swarm of floating probes can be programmed to periodically sink some tens of meters below the surface, collecting data, characterizing water properties and then coming to the surface again. The life span of the probes may be assured by an on-board power supply or through batteries recharged by solar cells. The basic idea of the WSN is reported together with a detailed analysis of the operational constraints, the energy requirements, and the electronic and mechanical discussion.
Considerations on Mechanism Designs as Suitable for Cultural Heritage Evaluation  [PDF]
Marco Ceccarelli
Advances in Historical Studies (AHS) , 2013, DOI: 10.4236/ahs.2013.24022
Abstract: Technological developments can be considered part of Cultural Heritage that deserves to be preserved for historical records and memories to a large public. Such a preservation can be also useful from technical viewpoints both to track past evolutions and to understand future trends. In this paper both designs and approaches for mechanism design are illustrated as worthy of being considered elements of Cultural Heritage with both above mentioned values mainly but not only for engineers. Examples of mechanism inventions and design algorithms both for whole machines and mechanism components are reported to show how technical achievements are and can be considered for Cultural Heritage in a broad sense and application, not only for technical use.
Fragility Curves of Existing RC Buildings Based on Specific Structural Performance Levels  [PDF]
Marco Vona
Open Journal of Civil Engineering (OJCE) , 2014, DOI: 10.4236/ojce.2014.42011
Abstract: In seismic risk mitigation policies, fragility functions of existing buildings play a fundamental role. In this paper, a procedure to develop analytical fragility curves for Moment Resisting Frame Reinforced Concrete buildings is presented. The design of the selected building typologies was performed according to the codes at the time of construction using force-based methods and the state of the practice at the time of construction. A total of 216 building classes were defined, considering different ages, number of storeys, infill panels, plan dimensions, beam stiffness, and concrete strength. The investigated buildings can be considered low-engineered buildings, using no seismic codes or old seismic codes. The seismic capacity of the selected models representing the existing RC buildings has been evaluated through non-linear dynamic simulations. Seismic response has been analyzed, considering various peak and integral intensity measures and various response parameters, such as ductility demands and Interstorey Drift Ratio (IDR). A new relationship among structural performance, damage levels and interstorey drift ratios for each studied type is introduced, which is calibrated using the damage levels described in EMS98. It is important to highlight that in this study, different thresholds of IDR have been associated with different typologies, considering their different ductility member levels after their different structural responses. Fragility Curves (FCs) for the studied structural types are set up, developed and discussed.
A Software Package Generating Long Term and Near Real Time Predictions of the Critical Frequencies of the F2 Layer over Europe and Its Applications  [PDF]
Marco Pietrella
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.64029
Abstract: Long term prediction and near real time (nowcasting) maps of the critical frequency of the F2 layer (foF2), over the geographic area extending in latitude from 34°N to 60°N and in longitude from -5°W to 40°E, have been provided since 2006 by the DIAS (European Digital Upper Atmosphere Server) system. This work describes the software package PRODUCTION_DATABASE_foF2 & Extract_Real_Time_Grid_foF2 constituted by two original software packages called PRODUCTION_ DATABASE_foF2 and Extract_Real_Time_Grid_foF2 which have been developed in the framework of the ESA SSA Programme P2-SWE-1, in order to provide numerical grids of foF2 prediction on a mapping area more extended than that offered by the DIAS both in latitude (from 34°N to 80°N) and in longitude (from -10
Conscious Use of the Virtual Sphere Modeling in the Simulation of Passive Night Cooling of Buildings  [PDF]
Marco Simonetti
Open Journal of Energy Efficiency (OJEE) , 2016, DOI: 10.4236/ojee.2016.52006
Abstract: Night cooling of building is considered as a technology with a high potential of impact on air conditioning energy needs. Natural ventilation should be the first option for night cooling, for obvious reasons of energy savings. The evaluation of the capacity of the building to cool down its structures during night ventilation is of primary concern during preliminary design stage, even though night cooling with natural ventilation is among the most complex problem to be modelled in details. Some modelling options are available, assuming different simplifications in space and time. Among them, virtual sphere modelling has been proposed in the past as a quick way to perform dynamic simulation of the night cooling of buildings. In this paper, the theoretical origin of the virtual sphere model is recalled, underlining its limits in case of application to buoyancy driven night cooling of buildings. The limits can explain the disagreements of virtual sphere prediction with other methods reported in literature and may stimulate a more conscious application of the model and further improvements of the method.
E. U. Customs Obligation  [PDF]
Marco Lupi
Beijing Law Review (BLR) , 2019, DOI: 10.4236/blr.2019.101002
Abstract: In a world that is increasingly globalized and open to trade, customs law has become increasingly central to businesses and consumers. From 1 May 2016 there has been a real revolution in customs: in fact, many of the provisions contained in the EU regulation no. 952/2013 which established the new EU Customs Code. The new simplifications are based on a more intense digitalization of the dialogue between the company and customs and they aim to both reduce the time spent on customs clearance, and also to provide external users with the traceability of the entire import/export cycle and the carrying out of controls connected. The transition to the new one, however, was not clear, but in order to protect the legitimate interests of the economic operators and to guarantee the validity of the decisions taken and the authorizations issued in force of the previous Union customs legislation, a transitional period was envisaged, until 1 May 2019, to allow the adaptation of these decisions and authorizations to the new legal provisions (reassessment). This contribution analyzes, in light of the new rules of the code, the conditions in relation to which the customs debt and the taxable persons required to fulfil the obligations arise. Finally, brief elements are dedicated to the settlement of customs duties, such as the classification of goods, having regard to the indications provided by the Common Customs Tariff, the origin and value of products. This electronic document is a “live” template. The various components of your paper [title, text, heads, etc.] are already defined on the style sheet, as illustrated by the portions given in this document.
Embedding Authentication & Authorization in Discovery Protocols for Standard Based Publish/Subscribe Middleware: A Performance Evaluation  [PDF]
Fabrizio Ronci, Marco Listanti
Communications and Network (CN) , 2011, DOI: 10.4236/cn.2011.31006
Abstract: Standard based Pub/Sub middleware, such as OMG Data Distribution Service (DDS), could assume a key role in supporting computer communications requiring continuous state information updating, deterministic deadline to data delivering and real time information adjourning. This kind of capability could be well ex-ploited by Peer-To-Peer (P2P) systems, Internet-wide as long as private ones, like in Public Safety or Civil Protection Communication Systems; but Pub/Sub specifications, and DDS/RTPS (Real Time Publish Sub-scribe) as well, usually do not provide Authentication & Authorization (AA) mechanisms. In the present work two important novelties are assessed: a possible scheme to implement AA in DDS/RTPS networks and a time performance evaluation study about embedded Authentication in RTPS.
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