Search results for "SED"
showing 10 items of 21612 documents
Temporal trends of heavy metals in sediment core from the gulf of Palermo (Sicily, Italy)
2009
The evaluation of long–term heavy metal concentrations in the Gulf of Palermo was carried out in this study. Measurements of Cr, Cu, Hg, Pb and Zn concentrations were performed by atomic absorption spectrophotometry (AAS) on dated fractions of a sediment core, dated by the 210Pbex method. They are found to cover a time period from 1951 to 2004. The constant sedimentation rate model was used for dating. Specific activities of 137Cs have also been measured in the sediment core sections as a check of the time scale derived by the 210Pbex method. A time-series analysis based on temporal decomposition was used in order to investigate the presence of heavy metal pollution trend. The additive comp…
Photoluminescence and Electron Spin Resonance of Silicon Dioxide Crystal with Rutile Structure (Stishovite)
2018
This work was supported by ERANET MYND. Also, financial support provided by Scientific Research Project for Students and Young Researchers Nr. SJZ/2017/2 realized at the Institute of Solid State Physics, University of Latvia is greatly acknowledged. The authors express our gratitude to R.I. Mashkovtsev for help in ESR signal interpretation. The authors are appreciative to T.I. Dyuzheva, L.M. Lityagina, N.A. Bendeliani for stishovite single crystals and to K. Hubner and H.-J. Fitting for stishovite powder of Barringer Meteor Crater.
Quaderni del Laboratorio Interdisciplinare di ricerca su Corpi, Diritti, Conflitti - I
2021
Il volume raccoglie i contributi dei relatori che hanno animato gli incontri e le attività seminariale del Laboratorio di ricerca Interdisciplinare di Corpi, Diritti, Conflitti, Dipartimento Culture e Società, Università di palermo, AA. 2018-2019/2019-2020
The Spatial Overlap of Police Calls Reporting Street-Level and Behind-Closed-Doors Crime: A Bayesian Modeling Approach
2021
Traditionally, intimate-partner violence has been considered a special type of crime that occurs behind closed doors, with different characteristics from street-level crime. The aim of this study is to analyze the spatial overlap of police calls reporting street-level and behind-closed-doors crime. We analyzed geocoded police calls in the 552 census-block groups of the city of Valencia, Spain, related to street-level crime (N = 26,624) and to intimate-partner violence against women (N = 11,673). A Bayesian joint model was run to analyze the spatial overlap. In addition, two Bayesian hierarchical models controlled for different neighborhood characteristics to analyze the relative risks. Resu…
The effect of defect location on coating fragmentation patterns under biaxial tension
2005
Fragmentation of a coating possessing orthogonal preferential crack propagation directions is modeled for equibiaxial tensile loading. Two plausible cracking scenarios are compared, caused by flaws randomly distributed over the area of the coating or along the coating fragment edges. The two fragmentation scenarios considered are shown to yield qualitatively different fragment patterns.
Experimental analysis, numerical and analytical modeling of shear strength mechanisms in Hybrid Steel Trussed Concrete Beams
2014
Modelling the evolution of periodicity in the periodical cicadas
2018
Background: Periodical cicadas (Magicicada spp.) have a life cycle that ends with the entire underground nymph population exhibiting a synchronized mass emergence to mate above ground. Previous studies have hypothesized that the periodical cicadas evolved from non-periodical cicadas by switching from a life-cycle length determined by body size to one determined by age. Questions: When can a mutation coding for fixed life-cycle length invade a resident population in which life-cycle length is variable? What determines the length of the fixed cycle? Methods: Numerical analysis of a mathematical model and simulations of an individual-based model. Results: If there is a sufficiently strong pred…
Coping with Uncertainty in an Agile Systems Development Course
2018
Uncertain and ambiguous environments are commonplace in information systems development (ISD) projects, and while different Agile frameworks welcome changes in organizational, technical, and business environments, the incurred uncertainty is known to negatively affect the development process and the quality of the final product. The effects of uncertainty on ISD projects have been studied in the past in real organizational contexts, but the effects of uncertainty on students in Agile systems development have received less attention from scholars. In this study, we measured the effects of experienced uncertainty on students’ performance in an Agile systems development course and how uncertai…
Uz stāstiem balstīti uzdevumi angļu valodas teksta izpratnes pilnveidei vidusskolā
2015
Diplomdarba nosaukums ir „Uz stāstiem balstīti uzdevumi angļu valodas teksta izpratnes pilnveidei vidusskolā”. Izvirzītais darba mērķis ir noskaidrot, kā uz stāstiem balstīti uzdevumi var palīdzēt pilnveidot vidusskolēnu teksta izpratni angļu valodas stundās. Atsevišķa gadījuma pētījums ir izvēlēts kā pētījuma metode, kas tika realizēts Siguldas Valsts ģimnāzijas 10. klases angļu valodas stundās. Tās dalībnieki bija 13 skolēni. Pētījuma laikā skolēni tika anketēti, analizēta skolēnu attieksme pret viņu obligātajiem mācību grāmatas tekstiem un viņu lasīšanas izpratne, aprakstīta skolēnu darbošanās angļu valodas stundās, kurās bija iekļauti uz stāstiem balstīti uzdevumi, un analizēta skolēnu …
Role of Cooperation with Stakeholders in Work-Based Learning Realization
2021
The research was supported by the NATIONAL RESEARCH PROGRAMME “LATVIAN HERITAGE AND FUTURE CHALLENGES FOR THE SUSTAINABILITY OF THE STATE” project “CHALLENGES FOR THE LATVIAN STATE AND SOCIETY AND THE SOLUTIONS IN INTERNATIONAL CONTEXT" (INTERFRAME-LV, Project No.VPP-IZM-2018/1-0005).