The Guitar as an Open-Air Instrument in the Early Romantic Era

In the first decades of the nineteenth century, playing music outdoors became a popular trend in Europe and North America. This largely reflected the Romantic ideal of coming closer to nature, whose allure played a significant role in contemporary education, literature, art, fashion, and music. By investigating a wide variety of written and pictorial sources, as well as surviving instruments in museum collections, this article discusses the development of the guitar as an “open-air” instrument as epitomised by the invention of guitar variants for use “on the go”. Moreover, the article sheds new light on the guitar’s connections to other portable wind and keyboard instruments, such as the csakan or the orphica, which were designed to provide musical accompaniment “al fresco”

A generalized binding framework for the Low Level Reader Protocol (LLRP)

Includes bibliographical references (p. 63).Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.This Master of Engineering Thesis describes the design, implementation and testing of an XML binding framework for the RFID Low Level Reader Protocol (LLRP). LLRP is a recently released protocol which standardizes the interface between RFID readers and RFID middleware. The proposed framework serializes wire objects to the schema of the LLRP binary messages and parameters. The framework also validates the produced XML elements against the LLRP data model. The framework includes a data serialization mechanism on the reader's side and allows for easy and efficient data updates as an RFID Network simulator.by Dimitrios Poulopoulos.M.Eng

The Impact of Religious Beliefs and Practices on Coping with Health Challenges Posed by Covid-19

In the midst of the Covid-19 pandemic, the aim of the present study was to investigate to what extent the undergraduate students of the Department of Dentistry, Aristotle University of Thessaloniki, felt the need to come closer to their own religiosity, spirituality, or faith. Materials and methods: Empirical research was conducted by means of an anonymous questionnaire, comprising demographics and items focusing on religiosity, spirituality, and faith. The survey results were processed using “MICROSOFT EXCEL IBM SPSS STATISTICS 24” statistical processing software. Results:  To overcome health dilemmas, the wide majority of students did not focus on religious & spiritual practices (70% & 66.7%) while at the same time, their religiosity & spirituality was not enhanced (74% & 78%). However, for the same period, 53% of the students stated that their faith was enhanced. Conclusions: While overall students’ religiosity & spirituality indicators were low, for the same period they stated that their faith in overcoming health distress was strengthened, which triggers new questions and prompts further research in the field of humanities.&nbsp

Ising thin films with modulations and surface defects

Properties of magnetic films are studied in the framework of Ising models. In particular, we discuss critical phenomena of ferromagnetic Ising films with straight lines of magnetic adatoms and straight steps on the surface as well as phase diagrams of the axial next-nearest neighbour Ising (ANNNI) model for thin films exhibiting various spatially modulated phases.Comment: 6 pages, 4 figures include

Photochemical degradation of organic pollutants in wastewaters

In the present work, the photochemical treatment of a synthetic wastewater in a batch recycle photochemical reactor using ultraviolet irradiation (254 nm, 6 W), hydrogen peroxide and ferric ions was studied. Reactor volume was 250 mL with 55.8 mL of irradiated volume in the annular photoreactor. The synthetic wastewater was composed mainly of organic carbon. The effect of initial total carbon (136-1080 mg L-1), initial H2O2 amount (1332-5328 mg L-1), pH, and Fe(III) presence (2-40 ppm), on total carbon (TC) removal was studied. Each experiment lasted 120 min, and the process was attended via pH and TC concentration. Direct photolysis in the absence of any oxidant had practically no effect on TC removal. Regarding the effect of initial TC concentration in the wastewater keeping the same initial hydrogen peroxide concentration (2664 mg L-1), it was observed that for 136-271 mg L-1 TC, around 60% TC removal was achieved, while when initial TC was increased at 528 mg L-1, the TC removal observed decreased to 50%. For a further increase in TC at 1080 mg L-1, TC removal dropped to 14%. Initial pH adjustment of the wastewater resulted in slight variations of the TC removals achieved. Finally, adding Fe(III) in the process was beneficial in terms of TC removal obtained. Particularly, the addition of 40 ppm Fe(III) in the presence of 2664 mg L-1 H2O2 and initial TC equal to 528 mg L-1 increased the TC removal from 50% to 72%

Photocatalytic treatment of a synthetic wastewater

This work aimed at investigating the photocatalytic treatment of a synthetic wastewater using UV light (254 nm, 6 W), TiO2 catalyst and H2O2 in a batch recycle annular photoreactor. The total volume of the solution was 250 mL while the irradiated volume in the annular photoreactor with 55.8 mL. Each experiment lasted 120 min and samples were sent for Total Carbon and HPLC analysis. The stock wastewater had initial total carbon 1118 mg L-1. The effect of the presence of phenol in the wastewater on total carbon (TC) removal was also studied. It was shown that the photocatalytic treatment was effective only when initial TC was decreased to 32 mg L-1, whereas the optimum TiO2 concentration was 0.5 g L-1, leading to a TC removal up to 56%. For the same initial carbon load, the optimum H2O2 concentration was found to be 67 mg L-1 resulting in 55% TC removal. Combining, however, TiO2 and H2O2 did not lead to better performance, as 51% TC removal was observed. In contrast, when initial carbon in the wastewater was partially substituted by phenol, the combination of catalyst and hydrogen peroxide was beneficial. Specifically, when 10 ppm of phenol were added keeping the same initial TC concentration, UV/TiO2 treatment resulted in 46% TC removal and 98% phenol conversion, whereas using additionally H2O2 led to 100% phenol conversion after 45 minutes and 81% TC removal

Photocatalytic treatment of organic pollutants in a synthetic wastewater using UV light and combinations of TiO2, H2O2 and Fe(III)

In this study, the photocatalytic treatment of an organic wastewater with/without phenolic compounds by means of ultraviolet irradiation, titanium dioxide and hydrogen peroxide was examined in an annular photoreactor. Specifically, the effect of initial total carbon concentration, catalyst loading and H2O2 amount on the removal of total carbon was first examined in the case of a synthetic organic wastewater. The influence of partial carbon substitution by phenol, 2-chlorophenol, 2,4-discholophenol, trichlorophenol, and 4-nitrophenol on total carbon removal and target compounds’ conversion was studied keeping constant the initial organic carbon load. It was shown that the process applied was effective in treating the wastewater for initial total carbon 32 mg L-1, 0.5 g L-1 TiO2, and 66.6 mg L-1 H2O2. Applying UV/TiO2 and UV/H2O2, 58% and 53% total carbon removals were achieved, respectively, but combining TiO2 and H2O2 did not result in a better performance in the case of the synthetic wastewater without any phenolic compounds. In contrast, when a phenolic compound was added, the addition of H2O2 was beneficial, eliminating the differences observed from one phenolic compound to another. The total carbon removals observed were lower than the corresponding final conversions of the target phenolic compounds. Finally, the electric energy per order values were calculated and found to range in 52–248 kWh/m3/order, being dependent from the process applied and the phenolic compound present in the wastewater