Search results for "PSU"

Abstract nouns as metadiscursive shells in academic discourse

2018

El discurs acadèmic es caracteritza per l’abundància de noms abstractes, com ara anàlisi, recerca, procés, concepte, aproximació o rol. Considerats mecanismes cohesius, atès que el seu significat discursiu es determina per referència al context en què apareixen, han rebut denominacions diverses en la bibliografia anglosaxona (anaphoric, signaling, carrier, shell o metadiscursive nouns). A partir de les propostes de Schmid (2000) i Jiang i Hyland (2016, 2017), aquest article explora la funció metadiscursiva d’aquests noms com a encapsuladors d’informacions complexes en un corpus de resums acadèmics elaborats per estudiants universitaris per als seus Treballs de Final de Grau. El treball abor…

Synthesis of mesoporous silica nanoparticles (MSNs) and encapsulation of cisplatin for targeted cancer therapies

2014

The aim of this PhD thesis is to elaborate mesoporous silica nanoparticles (MSNs) able to sustain the release of cisplatin into the intracellular compartments of solid tumors. The parametric study shows that morphological, structural and textural properties of MSNs-MCM-41, synthesized by sol-gel reaction by using TEOS as a silica source and CTAB as a structure-directing agent, depend on pH, stirring speed, temperature and extraction process of CTAB. The synthesis atmosphere has to be controlled in order to avoid the presence of ethanol and carbonate species which are responsible of necks between particles generating unstable suspensions of MSNs.MSNs were functionalized in order to control t…

Always on the move? Measured physical activity of 3-year-old preschool children

2015

Zvaigžņotā Debess: 2014/15, Ziema (226)

2014

Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: J.Stradiņš. Vestige of Otto Schmidt in Latvia (abridged) ; Leonora Roze. All-Union Conference in Latvian State University (abridged) ; DEVELOPMENTS in SCIENCE: K.Schwartz. Gravitational Waves and Cosmic Inflation ; DISCOVERIES: A.Alksnis. Light Echoes from Supernova 2014J in Galaxy M82 ; A.Alksnis. Discovery of the Benešov Meteorites 20 Years after the Bolide Event ; I.Pundure. Giant Filament on the Sun Watched by NASA's SDO ; I.Pundure. MAVEN’s Mars Exploration Mission Started ; SPACE RESEARCH and EXPLORATION: R.Misa. Plasma Engines and Ad Astra Rocket Company ; LATVIAN SCIENTISTS: J.Freimanis. Reviewing My 60 Years of Life (concluded) ; KĀRLI…

General Applications of Viscoelastics

2000

The many and diverse physicochemical characteristics of viscoelastic substances impose both their desired and undesired effects clinically. As there is no single ideal substance to meet clinical stipulations, individual viscoelastic characteristics should be considered with respect to demand. Georg Eisner described viscoelastic agents as a tool for space-occupying measures (in tissues, in space or on surfaces) applied by the use of special techniques (Eisner, 1980; Eisner, 1983). In surgery, viscoelastic substances protect tissues and cells from mechanical trauma, serve to separate tissues, occupy space, break away adhesions, stop bleeding, coat, act as manipulative instruments and move tis…

Testing Soil Encasing Materials for Measuring Hydraulic Conductivity of a Sandy-Loam Soil by the Cube Methods

2008

The Cube Method (CM) and the Modified Cube Method (MCM) were developed for measuring vertical (K v ) and horizontal (K h ) saturated hydraulic conductivity of a single soil sample. By these methods, a cube of soil is carved out in situ and a suitable material is applied to enclose the cube in a tightly fitting casing before moving the sample to the laboratory. Problems may be associated with the use of gypsum, originally used to encase soil. The suitability of molten wax and expandable polyurethane foam to encase a soil cube was tested for a sandy-loam soil. Wax-treated samples yielded lower conductivity results than untreated samples by a maximum factor of 3.7. The observed discrepancies w…

Valorization of natural drug products : from extraction to encapsulation

2020

This thesis was carried out at the Laboratory of Pharmacognosy and the Laboratory of Pharmaceutical technology, at the UFR Sciences de Santé, circonscription Pharmacy, in the University of Burgundy Franche-Comté, to find new natural molecules to encapsulate. First of all, we focused on the natural saponins from plants of the Vietnam biodiversity and the french horticulture, belonging to the three genera Dracaena, Cordyline (Asparagaceae) and Weigela (Caprifoliaceae). The work led to the successful isolation and elucidation of 42 natural saponins using various chromatographic techniques. The structures were determined by ESI mass spectrometry and NMR spectroscopy. Among the 17 pure compounds…

Encapsulation of Xenon by a Self-Assembled Fe4L6 Metallosupramolecular Cage

2015

We report (129)Xe NMR experiments showing that a Fe4L6 metallosupramolecular cage can encapsulate xenon in water with a binding constant of 16 M(-1). The observations pave the way for exploiting metallosupramolecular cages as economical means to extract rare gases as well as (129)Xe NMR-based bio-, pH, and temperature sensors. Xe in the Fe4L6 cage has an unusual chemical shift downfield from free Xe in water. The exchange rate between the encapsulated and free Xe was determined to be about 10 Hz, potentially allowing signal amplification via chemical exchange saturation transfer. Computational treatment showed that dynamical effects of Xe motion as well as relativistic effects have signific…

Interaction of CaSO4 with water vapour at high relative humidity

2010

16 pages. Prepublication en attente d'un complément expérimental; Soluble anhydrite β-CaSO4 reacts with water vapour at room temperature to form CaSO4-0.5H2O at 20-30% RH and CaSO4-0.6H2O at 70-80% RH. At higher RH, additional water uptake can only add-up to an adsorbed water layer. The present work provides evidence that a small amount of the adsorbent dissolves in the adsorbed layer and gypsum starts precipitating at 97-98 %RH even though condensation of the vapour phase does not take place. After several days the adsorbent is almost entirely and irreversibly converted. The kinetics of weight gain clearly discriminates between adsorption and dissolution-precipitation. If a minute amount o…

Irreversible modifications of the porous microstructure of soluble anhydrite β-CaSO4 induced by hydration-dehydration cycles

2006

26 pages; The internal surface area of hexagonal (soluble) primary anhydrite CaSO4 produced by dehydration of gypsum decreases by about 70 % when the anhydrite is successively subjected to rehydration and dehydration at room temperature in humid air and in vacuum respectively. In the rehydration step, the hemihydrate is formed; its dehydration yields secondary anhydrite. Additional hydration-dehydration cycles in the same conditions have a much smaller effect. The first cycle also brings about a modification of the t-plot, which reveals that the micropores of primary anhydrite are irreversibly healed. Mercury intrusion porosimetry shows that the primary dehydration of gypsum also generates …