An Integrated Characterization Strategy on Board for Recycling of poly(vinyl butyral) (PVB) from Laminated Glass Wastes

: Polyvinyl butyral (PVB) is widely used as an interlayer material in laminated glass applications, mainly in the automotive industry, but also for construction and photovoltaic applications. Post-consumed laminated glass is a waste that is mainly landfilled; nevertheless, it can be revalorized upon efficient separation and removal of adhered glass. PVB interlayers in laminated glass are always plasticized with a significant fraction in the 20-40% w/w range of plasticizer, and they are protected from the environment by two sheets of glass. In this work, the aim is to develop a thorough characterization strategy for PVB films. Neat reference PVB grades intended for interlayer use are compared with properly processed (delaminated) post-consumed PVB grades from the automotive and construction sectors. Methods are developed to open opportunities for recycling and reuse of the latter. The plasticizer content and chemical nature are determined by applying well-known analytical techniques, namely, FT-IR, TGA, NMR. The issue of potential aging during the life cycle of the original laminated material is also addressed through NMR. Based on the findings, a sensor capable of directly sorting PVB post-consumer materials will be developed and calibrated at a later stage

Technological and typological investigation of late roman glass mosaic tesserae from ancient Messene, Greece

The present paper aims at investigating Late Ro- man mosaic tesserae excavated in 2008 at the sanctuary of Isis and Sarapis, an archaeological site of ancient Messene situated in the south-western Peloponnese region of Greece. In order to further understand the production of tesserae during Roman times, both archaeological and scientific aspects will be considered, however, emphasis will be placed on the scientific analysis of the tesserae this in turn, leading to concrete findings which can further contribute to existing studies

Static and Dynamic Analysis of Linear Piezoelectric Structures Using Higher Order Shear Deformation Theories

This paper explores the effects of shear deformation on piezoelectric materials and structures that often serve as substrate layers of multilayer composite sensors and actuators. Based on higher-order shear elastic deformation and electric potential distribution theories, a general mathematical model is derived. Governing equations and the associated boundary conditions for a piezoelectric beam are developed using a generalized Hamilton’s principle. The static and dynamic behavior of the piezoelectric structure is investigated. A bending problem in static analysis and a free vibration problem in dynamic analysis are solved. The obtained results are in very good agreement with the results of the exact two dimensional solution available in the literature

Original Varnish Recipes in Post-Byzantine Painting Manuals

During the last decades, manuscripts have become increasingly available through digitization and deposition in online repositories. This trend has very much facilitated primary source research, as scholars are no longer subjected to time- and effort-consuming processes such as travel, applications for photography permissions, and so on. In this framework, the authors set forth the results of research that deals with post-Byzantine panel-painting varnish recipes which were found in a hitherto unpublished Greek painting manual dating back to 1824. The recipes in consideration are compared to those existing in the renowned “Hermeneia” by Dionysios of Fourna (early 18th century) painter’s manual. A brief discussion dealing with various pertinent terms, along with a note on data deriving from the analytical investigation of varnish samples stemming from post-Byzantine icons are also included in this work. The study reveals a shift towards lean and intermediate varnish recipes during the early 19th century that might reflect the progression of resins and oleoresins, and the gradual replacement of oil-based varnishes. In addition, a unique recipe describing various methods of varnish application is transcribed and commented upon. Finally, the analytical data revealed an unexpected employment of a protein-based varnish in a mid-19th century icon

Original Varnish Recipes in Post-Byzantine Painting Manuals

During the last decades, manuscripts have become increasingly available through digitization and deposition in online repositories. This trend has very much facilitated primary source research, as scholars are no longer subjected to time- and effort-consuming processes such as travel, applications for photography permissions, and so on. In this framework, the authors set forth the results of research that deals with post-Byzantine panel-painting varnish recipes which were found in a hitherto unpublished Greek painting manual dating back to 1824. The recipes in consideration are compared to those existing in the renowned “Hermeneia” by Dionysios of Fourna (early 18th century) painter’s manual. A brief discussion dealing with various pertinent terms, along with a note on data deriving from the analytical investigation of varnish samples stemming from post-Byzantine icons are also included in this work. The study reveals a shift towards lean and intermediate varnish recipes during the early 19th century that might reflect the progression of resins and oleoresins, and the gradual replacement of oil-based varnishes. In addition, a unique recipe describing various methods of varnish application is transcribed and commented upon. Finally, the analytical data revealed an unexpected employment of a protein-based varnish in a mid-19th century icon

By the Hand of Angelos? Analytical Investigation of a Remarkable 15th Century Cretan Icon

A 15th century St Theodoros icon of outstanding quality is on display at the Zakynthos Ecclesiastical Art Museum. On the basis of certain stylistic characteristics, this icon has been attributed to the legendary Cretan painter Angelos Akotantos. In order to explore the latter attribution, the icon was subjected to examination via multispectral imaging, while microsamples were investigated through an optical microscope (OM), a scanning electron microscope coupled with an energy dispersive analyzer (SEM-EDX), μ-Raman and X-ray diffraction (XRD). The data were evaluated in the light of the findings of recent analytical studies conducted on several genuine Angelos icons. Identified materials include gypsum, gold leaf, bole, natural ultramarine, lead white, charcoal, green earth, red lake, minium, cinnabar, and red and yellow ochres. The identified materials resemble those employed by Angelos, while the identification of ultramarine is of particular significance, as this extremely expensive and rather rare pigment was very often used by the particular painter. Moreover, multispectral imaging reveals notable painting technique similarities between the icon in consideration and known Angelos icons, while cross sections of corresponding samples exhibit almost identical structures. Overall, the present work considerably strengthens the suggestion that the St Theodoros icon in consideration was painted by Angelos and also widens our knowledge regarding the late Byzantine painting

Pore Structure and Gas Diffusion Features of Ionic Liquid-Derived Carbon Membranes

In the present study, the concept of Ionic Liquid (IL)-mediated formation of carbon was applied to derive composite membranes bearing a nanoporous carbon phase within their separation layer. Thermolytic carbonization of the supported ionic liquid membranes, prepared by infiltration of the IL 1-methyl-3-butylimidazolium tricyanomethanide into the porous network of Vycor® porous glass tubes, was applied to derive the precursor Carbon/Vycor® composites. All precursors underwent a second cycle of IL infiltration/pyrolysis with the target to finetune the pore structural characteristics of the carbonaceous matter nesting inside the separation layer. The pore structural assets and evolution of the gas permeation properties and separation efficiency of the as-derived composite membranes were investigated with reference to the duration of the second infiltration step. The transport mechanisms of the permeating gases were elucidated and correlated to the structural characteristics of the supported carbon phase and the analysis of LN2 adsorption isotherms. Regarding the gas separation efficiency of the fabricated Carbon/Vycor® composite membranes, He/CO2 ideal selectivity values as high as 4.31 at 1 bar and 25 °C and 4.64 at 0.3 bar and 90 °C were achieved. In addition, the CO2/N2 ideal selectivity becomes slightly improved for longer second-impregnation times

Inferences from the human skeletal material of the Early Iron Age cemetery at Agios Dimitrios, Fthiotis, Central Greece

The Geometric cemetery of Agios Dimitrios (850–740 B.C.) yielded a human osteological sample, with an MNI of 51 and equal numbers of males and females and adults and subadults. This site is of significant archaeological importance, as it provides information on human health status, diet, and activity patterns as well as mortuary behavior for a little studied time period. The results, including a) stable carbon and nitrogen isotopic data suggesting a C3 low-protein plant diet, b) relatively high infant mortality, c) low stature estimates, d) significant prevalence of possible anemic conditions, and e) high dental infection and loss rates, all point to a rapidly increasing, stressed, and relatively malnourished population which did not exploit nearby marine resources, experienced suboptimal living conditions, and could not reach its biological potential. Furthermore, the study of this group provides evidence of equal burial treatment of all age and sex categories, no dietary differences in terms of sex and status, and no sex differentiation in pathological conditions

Molecular Diagnosis of Hypertrophic Cardiomyopathy (HCM): In the Heart of Cardiac Disease

Hypertrophic cardiomyopathy (HCM) is an inherited myocardial disease with the presence of left ventricular hypertrophy (LVH). The disease is characterized by high locus, allelic and phenotypic heterogeneity, even among members of the same family. The list of confirmed and potentially relevant genes implicating the disease is constantly increasing, with novel genes frequently reported. Heterozygous alterations in the five main sarcomeric genes (MYBPC3, MYH7, TNNT2, TNNI3, and MYL2) are estimated to account for more than half of confirmed cases. The genetic discoveries of recent years have shed more light on the molecular pathogenic mechanisms of HCM, contributing to substantial advances in the diagnosis of the disease. Genetic testing applying next-generation sequencing (NGS) technologies and early diagnosis prior to the clinical manifestation of the disease among family members demonstrate an important improvement in the field

Non-Destructive Characterization of Selected Types of Films and Other Layers via White Light Reflectance Spectroscopy (WLRS)

In this work, we consider White Light Reflectance Spectroscopy (WLRS) as an optical methodology for the accurate, fast and non-destructive measurement of film thickness in the 1 nm to the 1 mm range and for applications that include microelectronics, photonics, bioanalysis and packaging. Films to which WLRS is applicable can be either homogeneous or layered-composite ones, while thickness and composition might be fixed or varying with time; in the latter case, real-time monitoring of the kinetics of processes such as certain transitions, film dissolution and bioreactions is possible. We present the basic principles of WLRS and a selection of characteristic application examples of current interest, and we also briefly compare WLRS with alternative methods for film measurement