Search results for "material"

1,1,4,4-Tetramethylpiperazinediium dibromide

2009

A small quantity of the title compound, C8H20N22+·2Br−, was formed as a by-product in a reaction between a diamine and an alkyl bromide. The asymmetric unit contains half of a centrosymmetric dication and a bromide anion. In the crystal, weak intermolecular C—H...Br hydrogen bonds consolidate the crystal packing.

Harnessing Molecular Fluorophores in the Carbon Dots Matrix: The Case of Safranin O

2022

The origin of fluorescence in carbon dots (C-dots) is still a puzzling phenomenon. The emission is, in most of the cases, due to molecular fluorophores formed in situ during the synthesis. The carbonization during C-dots processing does not allow, however, a fine control of the properties and makes finding the source of the fluorescence a challenging task. In this work, we present a strategy to embed a pre-formed fluorescent molecule, safranin O dye, into an amorphous carbonaceous dot obtained by citric acid carbonization. The dye is introduced in the melted solution of citric acid and after pyrolysis remains incorporated in a carbonaceous matrix to form red-emitting C-dots that are strongl…

Controlling the crystal growth of potassium iodide with a 1,1'-bis(pyridin-4-ylmethyl)-2,2'-biimidazole ligand (L) – formation of a linear [K4I4L4]n …

2018

The crystal growth of potassium iodide was controlled by using the neutral organic 1,1′-bis(pyridin-4-ylmethyl)-2,2′-biimidazole (L) ligand as a modifier. The selected modifier allows the preservation of original cubic [K4I4] units and their arrangement into a linear ligand-supported 1D chain. The supported [K4I4] cubes are only slightly distorted compared to the cubes found in pure KI salt. The N–K binding of the ligand to the KI salt, as well as weak I⋯H, N⋯H, and N⋯I interactions, stabilizes the structure to create a unique 1D polymer of neutral potassium iodide ionic salt inside the [K4I4L4]n complex.

University, Health and Society. Materials docents

2018

El document forma part dels materials docents programats mitjançant l'ajut del Servei de Política Lingüística de la Universitat de València Teaching materials for the subject "University, Health, Society", in the curriculum of the grade of Medicine. It includes the Syllabus or teaching programme, Slides of the power point presentation, materials for the practical activities, and complementary information. Teaching materials for the subject "University, Health, Society", in the curriculum of the grade of Medicine. It includes the Syllabus or teaching programme, Slides of the power point presentation, materials for the practical activities, and complementary information.

Ehdotus ihmistä suhteellistavaksi sanastoksi

2021

”Ehdotus ihmistä suhteellistavaksi sanastoksi” käsittelee ja esittelee teoriasuuntausta, joka tunnetaan ”posthumanistisena”, keskittyen erityisesti sen käsitteisiin ja termeihin. Posthumanistinen ajattelu pyrkii käsitteelliseen uudistamiseen, jotta tunnistaisimme paremmin ne suhteellisuudet, joiden varassa ja lomassa ihmisten elämä ja merkitykset muotoutuvat – ja ne historiat, joissa ihminen on muotoutunut erilliseksi. Ehdotamme sanastoa, joka suhteellistaa juuri tätä käsitteellistä, kartesiolaisen humanismin ihmistä. Yhtäältä seuraamme käsitteellisen ajattelun muotoutumista erilaisten kontekstien paineissa, toisaalta pysähdymme tarkastelemaan tiettyjä, työskentelyssämme tärkeitä käsitteitä…

Nonlinear Absorption and Refraction of Picosecond and Femtosecond Pulses in HgTe Quantum Dot Films

2021

We report measurements of the saturated intensities, saturable absorption, and nonlinear refraction in 70-nm thick films containing 4 nm HgTe quantum dots. We demonstrate strong nonlinear refraction and saturable absorption in the thin films using tunable picosecond and femtosecond pulses. Studies were carried out using tunable laser pulses in the range of 400–1100 nm. A significant variation of the nonlinear refraction along this spectral range was demonstrated. The maximal values of the nonlinear absorption coefficients and nonlinear refractive indices determined within the studied wavelength range were −2.4 × 10−5 cm2 W−1 (in the case of 28 ps, 700 nm probe pulses) and −3 × 10−9 cm2 W−1 …

Trait Hedonism and the Distribution of Savoring and Positive Emotion States in Everyday Life.

2022

International audience; The present study aimed at (1) identifying the emotion regulation processes that can explain the trait hedonism positive emotions relationship, and (2) determining whether this relationship varies according to which part of the distribution of positive emotions is considered. To this end, the intensity of the positive emotions felt by 84 adult participants, and the intensity of their engagement in savoring, were assessed twice a day over a month period, using an Experience Sampling Method. Participants’ distributions of these variables were then related to their level of trait hedonism, assessed with a common questionnaire. Results suggested that, as expected, the tr…

Multilayer porous PLA scaffolds for tissue engineering applications

2013

Rat Cardiac progenitor cells and their application in cell therapy

2015

cells and the subsequent heart failure. When the pharmacological approach no longer complies with the disease evolution, organ transplantation appears to be the only treatment able to rescue the patient life. Cell therapy promises to be clinically efficient and would allow circumventing many limitations of organ transplantation, such as organ low availability, major surgical procedures, high costs and longterm immunosuppression [1]. We designed porous Poly-Lactic Acid (PLLA) and Fibroin scaffolds to deliver CPCs in the heart, we isolated and characterized CPCs for the expression of c-Kit, MDR-1 and Sca-1 by flow cytometry, we tested their degree of differentiation in vitro studying the expr…

Experimental Observation of a Large Low-Frequency Band Gap in a Polymer Waveguide

2018

The quest for large and low-frequency band gaps is one of the principal objectives pursued in a number of engineering applications, ranging from noise absorption to vibration control, and to seismic wave abatement. For this purpose, a plethora of complex architectures (including multiphase materials) and multiphysics approaches have been proposed in the past, often involving difficulties in their practical realization. To address the issue of proposing a material design that enables large band gaps using a simple configuration, in this study we propose an easy-to-manufacture design able to open large, low-frequency complete Lamb band gaps exploiting a suitable arrangement of masses and stif…