Search results for "material"
showing 10 items of 32550 documents
Complex multilayer carbon structures for green energetics
2017
The authors greatly acknowledge the IMIS2 project of the National Reform Programme of Latvia for financial support. The publication costs of this article were covered by the Estonian Academy of Sciences and the University of Tartu.
Restoration of a XVII Century’s predella reliquary: From Physico-Chemical Characterization to the Conservation Process
2021
We report on the restoration of a XVII century’s predella reliquary, which is a part of a larger setup that includes a wall reliquary and a wooden crucified Christ, both belonging to the church of “Madre Maria SS. Assunta”, in Polizzi Generosa, Sicily, Italy. The historical/artistic and paleographic research was flanked successfully by the scientific objective characterization of the materials. The scientific approach was relevant in the definition of the steps for the restoration of the artefact. The optical microscopy was used for the identification of the wood species. Electron microscopy and elemental mapping by energy-dispersive X-ray (EDX) was successful in the identification of the l…
Antifouling Mortars for Underwater Restoration
2022
This research has focused on the assessment of the compositional features and mechanical and antifouling performances of two different mortars formulated for an underwater setting, and which contain Mg(OH)2 as an antifouling agent. Regarding the mechanical characterization, the uniaxial compressive strength and flexural strength were measured. The composition of the materials was explored by differential thermal/thermogravimetric analysis (DTA-TG), X-ray diffraction analysis (XRPD), and scanning electronic microscopy (SEM) coupled with EDS microanalysis. The assessment of the biological colonization was evaluated with colorimetric analysis and image analysis. The results suggest that both m…
Physicochemical investigation of surfactant-coated gold nanoparticles synthesized in the confined space of dry reversed micelles
2006
Abstract Gold nanoparticle/surfactant composites have been synthesized by a novel reduction reaction in the confined space of dry sodium bis(2- ethylhexyl)sulfosuccinate (AOT) or lecithin reversed micelles dispersed in n-heptane and cyclohexane, respectively. The reaction was carried out by adding an opportune amount of anhydrous hydrazine/tetrahydrofuran solution to a suspension of HAuCl4-containing dry reversed micelles dispersed in organic solvent. UV–vis investigation ascertained the formation of stable metal gold nanoparticles and the analysis of FT-IR spectra highlighted the formation of an oriented surfactant monolayer at the nanoparticle surface. Simple evaporation under vacuum of t…
Approccio Metodico alla Riprogettazione di un Semirimorchio
2003
Economic competition leads to continuous development of new products and processes, but it is opposed by the decrease of speed of characteristics improvement and by the consequent tendency of the market to saturation. Redesign assumes in this context a particular remark because it cans allowing the acceleration of process of performances increase. This objective needs a methodical and structured approach that can leading, even, to the modification of product concept. In this work it has been studied the possibility of reducing the mass of a road semitrailer, by intervening on its structural elements. Some solutions, characterized by new topology and/or materials, have been examined and a st…
Introduction
2020
The material dimension of cult practices and ritual communication in ancient sanctuaries is the central issue of all contributions gathered in the book, which has been framed within three complementary areas of enquiry. Firstly, the architectural settings of sanctuaries was examined beyond temple buildings to appraise the wider context of their structural and spatial complexity. Secondly, the material culture of votive deposition and religious feasting is analysed in terms of performative characteristics and through the lens of anthropological approaches. Thirdly, the significance of gender in cultic practice is investigated in light of the fresh data retrieved from the field.
Recupero e rigenerazione urbana della cava e dell’area dello Stazzone in contrada Cappuccini. Luci e ombre sotto piazza sant’Anna.
2021
In questo saggio sono illustrati gli studi su un’area marginale del centro storico di Alcamo condotti da un gruppo di ricerca del Circes, costituito dai proff. Tiziana Campisi (coordinamento e direzione della unità di ricerca), Simona Colajanni e Manfredi Saeli (componenti dell’unità di ricerca) e - per allora – dall’allieva ingegnere Alessandra Foderà, con la collaborazione esterna del geologo dott. Antonio Bambina. Il centro storico di Alcamo, per la sua complessità e articolazione, può costituire un contesto particolarmente idoneo per supportare sperimentazioni progettuali basati sulla utilizzazione dei più aggiornati strumenti di recupero e rigenerazione. Negli ultimi anni, infatti, la …
Investigation of a Gravel-Bed River’s Pattern Changes: Insights from Satellite Images
2021
Changes in river pattern have been documented in the literature. The recognition of islands and vegetated patches, which is indicative of the evolution processes, requires simultaneous information at different points and at different times and field studies are still difficult and scarce. The present work, focusing the attention on a gravel-bed river, explores the possibility to conduct a first-step pattern changes analysis by identifying the evolution of the morphological features and taking information of islands and vegetated patches from satellite images easily available from Google Earth. The study is conducted by combining the information taken from both the satellite images and the f…
The Influence of Nanoparticle Shape on Protein Corona Formation
2020
Nanoparticles have become an important utility in many areas of medical treatment such as targeted drug and treatment delivery as well as imaging and diagnostics. These advances require a complete understanding of nanoparticles' fate once placed in the body. Upon exposure to blood, proteins adsorb onto the nanoparticles surface and form a protein corona, which determines the particles' biological fate. This study reports on the protein corona formation from blood serum and plasma on spherical and rod‐shaped nanoparticles. These two types of mesoporous silica nanoparticles have identical chemistry, porosity, surface potential, and size in the y ‐dimension, one being a sphere and the other a …
Photoluminescent Detection of Human T-Lymphoblastic Cells by ZnO Nanorods.
2020
The precise detection of cancer cells currently remains a global challenge. One-dimensional (1D) semiconductor nanostructures (e.g., ZnO nanorods) have attracted attention due to their potential use in cancer biosensors. In the current study, it was demonstrated that the possibility of a photoluminescent detection of human leukemic T-cells by using a zinc oxide nanorods (ZnO NRs) platform. Monoclonal antibodies (MABs) anti-CD5 against a cluster of differentiation (CD) proteins on the pathologic cell surface have been used as a bioselective layer on the ZnO surface. The optimal concentration of the protein anti-CD5 to form an effective bioselective layer on the ZnO NRs surface was selected. …