Search results for "HDI"
showing 10 items of 789 documents
Kicking Tongues de Karen King-Aribisala : Journeys Into Otherness
2009
Disponible en ligne: http://e-crit3224.univ-fcomte.fr/download/3224-ecrit/document/numero_1/l_article_joseph-vilain_149_64.pdf; Cette communication proposait d'utiliser la notion de « translation » définie par Salman Rushdie dans son célèbre articles sur les « patries imaginaires » pour comprendre comment Kicking Tongues, de Karen King-Aribisala, utilise et transforme les Canterbury Tales de Chaucer pour créer une œuvre hybride et, étonnamment, nigériane
Ibuprofen degradation using a Co-doped carbon matrix derived from peat as a peroxymonosulphate activator
2021
The wider presence of pharmaceuticals and personal care products in nature is a major cause for concern in society. Among pharmaceuticals, the anti-inflammatory drug ibuprofen has commonly been found in aquatic and soil environments. We produced a Co-doped carbon matrix (Co-P 850) through the carbonization of Co2+ saturated peat and used it as a peroxymonosulphate activator to aid ibuprofen degradation. The properties of Co-P 850 were analysed using field emission scanning electron microscopy, energy filtered transmission electron microscopy and X-ray photoelectron spectroscopy. The characterization results showed that Co/Fe oxides were generated and tightly embedded into the carbon matrix …
Microscopic Insights Into the Formation of Methanesulfonic Acid–Methylamine–Ammonia Particles Under Acid-Rich Conditions
2022
Understanding the microscopic mechanisms of new particle formation under acid-rich conditions is of significance in atmospheric science. Using quantum chemistry calculations, we investigated the microscopic formation mechanism of methanesulfonic acid (MSA)–methylamine (MA)–ammonia (NH3) clusters. We focused on the binary (MSA)2n-(MA)n and ternary (MSA)3n-(MA)n-(NH3)n, (n = 1–4) systems which contain more acid than base molecules. We found that the lowest-energy isomers in each system possess considerable thermodynamic and dynamic stabilities. In studied cluster structures, all bases are protonated, and they form stable ion pairs with MSA, which contribute to the charge transfer and the stab…
Modeling atmospheric aging of small-scale wood combustion emissions: distinguishing causal effects from non-causal associations
2022
Small-scale wood combustion is a significant source of particulate emissions. Atmospheric transformation of wood combustion emissions is a complex process involving multiple compounds interacting simultaneously. Thus, an advanced methodology is needed to study the process in order to gain a deeper understanding of the emissions. In this study, we are introducing a methodology for simplifying this complex process by detecting dependencies of observed compounds based on a measured dataset. A statistical model was fitted to describe the evolution of combustion emissions with a system of differential equations derived from the measured data. The performance of the model was evaluated using simu…
Saturation vapor pressure characterization of selected low-volatility organic compounds using a residence time chamber
2023
Saturation vapor pressure (psat) is an important thermodynamic property regulating the gas-to-particle partitioning of organic compounds in the atmosphere. Low-volatility organic compounds (LVOCs), with sufficiently low psat values, primarily stay in the particle phase and contribute to aerosol formation. Obtaining accurate information on the psat of LVOCs requires volatility measurements performed at temperatures relevant to atmospheric aerosol formation. Here, we present an isothermal evaporation method using a residence time chamber to measure psat for dry single-compound nanoparticles at 295 K. Our method is able to characterize organic compounds with psat spanning from 10−8 to 10−4 Pa …
Predicting liquid–liquid phase separation in ternary organic–organic–water mixtures
2023
Liquid–liquid phase separation (LLPS) affects the water uptake of aerosol particles in the atmosphere through Kelvin and Raoult effects. This study investigates LLPS in ternary mixtures containing water and two organic compounds, using a conductor-like screening model for real solvents (COSMO-RS). COSMO-RS found LLPS in all of the studied mixtures containing water and proxies for primary and secondary organic aerosol (POA and SOA, respectively), due to the limited solubility of the hydrophobic POA proxies in water. The computations predict additional three-phase states in some of the SOA–POA–water mixtures at relative humidity (RH) close to 100%, which was not observed in experiments, likel…
Antecedents and consequences of long-term unemployment
2001
Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet
2018
Breaking through the nitrogen ceiling Single-molecule magnets could prove useful in miniaturizing a wide variety of devices. However, their application has been severely hindered by the need to cool them to extremely low temperature using liquid helium. Guo et al. now report a dysprosium compound that manifests magnetic hysteresis at temperatures up to 80 kelvin. The principles applied to tuning the ligands in this complex could point the way toward future architectures with even higher temperature performance. Science , this issue p. 1400
Hukkuvien hätähuudoista postmodernin uususkontoihin : Kotimaa-lehden lähetystyökuva vuosina 1965, 1975, 1985 ja 1995
1997
Aktiivisen ikääntymisen diskurssi Helsingin Sanomien pääkirjoitusaukeamalla vuosina 2000-2015
2022
Aktiivisen ikääntymisen politiikkaa on pidetty ratkaisuna ikääntymisen haasteisiin. Tarkastelen artikkelissani, miten aktiivisen ikääntymisen diskurssi näkyy Helsingin Sanomien pääkirjoitusaukeaman teksteissä vuosina 2000–2015.Foucault´laisella diskurssianalyysilla tutkin, millaisten aladiskurssien kautta diskurssi rakentuu ja millaisia subjektipositioita on varattu ikääntyneille. Tulosten mukaan työuran pidentäminen näkyy aineistossa vahvasti ja ikääntyneet nähdään resurssina. Yhteiskunnalta odotetaan kuitenkin varautumista väestön ikääntymiseen, esimerkiksi hoivakustannuksiin ja ikäystävällisen ympäristön tarpeeseen. Toisaalta ikääntyneiden poliittiseen aktiivisuuteen suhtaudutaan risti…