16 research outputs found
Prevención de lesiones y entrenamiento de la fuerza en runners
No full textEl presente webinar fue dictado por Pablo Carroni, Federico Wickel y Rodrigo Amoroso y organizado por la Sede este de la Universidad Juan Agustín Maza, en el marco de una charla en la que se varios expertos comentan sobre las lesiones en runners y el entrenamiento de fuerza desde sus diferentes campos. Podés ver también este webinar en nuestro canal de Youtube: https://www.youtube.com/watch?v=W3kYzEc5v1Y&list=PLtrc2io3FDLOv4DCcuEHHAj8XSniotGAw&index=3
A MONOGRAPH OF THE GENUS HERITIERA* Aiton** (StercuL) (including Argyrodendron F. v. M. and Tarrietia Bl.)
No full text The genera Heritiera Ait., Argyrodendron F.v.M. and Tarrietia Bl. are united.The genus comprises 29 species ranging from India, Malaysia, New Guineaand the Pacific region to tropical Australia (2 species, of which one extends to Celebes)and 2 species in tropical Africa. The following ten species are described here for the first time: Heritieraarafurensis Kosterm., H. aurea Kosterm., H. burmensis Kosterm., H. catappa Kosterm,H. cordata Kosterm., H. globosa Kosterm., H. macroptera Kosterm., H. novoguineensis Kosterm, H. percoriacea Kosterm., and H. pterospermoides Kosterm. The following ten new combinations are created: Heritiera actinophylla(Bailey) Kosterm. (basionym: Tarrietia actinophylla Bailey), H. albiflora (Ridley)Kosterm. (basionym: Tarrietia albiflora Ridley), H. borneensis (Merr.) Kosterm. (basio-nym: Tarrietia borneensis Merr.), H. densiflora (Pellegrin) Kosterm. (basionym:Tarrietia densiflora (Pellegrin) Aubreville et Normand), H. jaranica (Bl.) Kosterm.(basionym: Tarrietia javanica Bl.), H. kiinstleri (King) Kosterm. (basionym: Tarrietiakunstleri King), H. peralata (Domin) Kosterm. (basionym: Tarrietia peralata Domin),H. simplicifolia (Mast.) Kosterm. (basionym: Tarrietia simplicifolia Mast.), H. suma-trana (Miq.) Kosterm. (basionym: Tarrietia sumatrana Miq.), and H. trifoliolata (F.v. M.) Kosterm. (basionym: Argyrodendron trifoliolatum F. v. M.).The following fifteen species are reduced to synonymy: Argyrodendron amboinensis Haberlandt; Heritiera acuminata Wall, ex Kurz, H. annamensis Lecomte,H. minor Lam. H. tothila (Gaertn.) Kurz, H. vespertilio Kurz; Tarrietia actinodendronGuilfoyle, T. amboinensis Hochr, T. Argyrodendron Benth., T. carroni Moore, T. curtisii King, T. perakensis King, T. riedeliana Oliv., T. rubiginosa Kosterm. andT. - unifoliolata Ridley. The following seven species are excluded from the genus: Heritiera attenuataWall., H. grandis Fisch. ex Steud., H. spectabilis Baill., H. tinctoria Blanco; Tarrietia barteri (Mast.) Hochr., T. erythrosiphon (Baill.) Hochr. and T. perrieri Hochr
CFD Based Development of a Fuel-Air Premixer for a Retrofittable Catalytic Combustion System
No full textCoupling Lipid Nanoparticle Structure and Automated Single‐Particle Composition Analysis to Design Phospholipase‐Responsive Nanocarriers
No full textLipid nanoparticles (LNPs) are versatile structures with tunable physicochemical properties that are ideally suited as a platform for vaccine delivery and RNA therapeutics. A key barrier to LNP rational design is the inability to relate composition and structure to intracellular processing and function. Here we combine Single Particle Automated Raman Trapping Analysis (SPARTA®) with small angle scattering (SAXS / SANS) techniques to link LNP composition with internal structure and morphology and to monitor dynamic LNP - phospholipase D (PLD) interactions. Our analysis demonstrates that phospholipase D, a key intracellular trafficking mediator, can access the entire LNP lipid membrane to generate stable, anionic LNPs. PLD activity on vesicles with matched amounts of enzyme substrate was an order of magnitude lower, indicating that the LNP lipid membrane structure can be used to control enzyme interactions. This represents an opportunity to design enzyme-responsive LNP solutions for stimuli-responsive delivery and diseases where PLD is dysregulated
Apoptotic proteins as prognostic markers and indicators of radiochemosensitivity in stage II/III rectal cancers
No full textImpact d’un algorithme basé sur la procalcitonine dans la prise en charge des occlusions grêliques sur brides
No full textAuthor response: Regulatory coiled-coil domains promote head-to-head assemblies of AAA+ chaperones essential for tunable activity control
No full textHigh pressure catalytic combustion
No full textThe study of catalyst behavior at pressure up to 12 bar during CH4, H2, CO and their mixtures combustion is the main purpose of this PhD thesis. Actually the interest towards catalytic combustion as an alternative route to produce electric power is renewed due to the use of Low-Btu fuels. Therefore the research activity was focused notably on CH4 but also on H2 and CO combustions and on the effect of their addition on methane combustion at variable pressure.
At this purpose it was necessary to design and realize an innovative lab scale plant which operates at temperatures up to 1000°C and pressure up to 12 bar and, with the proper reactor configuration and operative conditions, in two different operating modes: isothermal and auto-thermal.
The active phases considered in this experimental activity are a conventional Pt catalyst (1%wt), and a more thermally stable catalyst, a supported perovskite (20%wt LaMnO3), and a bi-functional Pt-perovskite catalyst. Perovskites are cheap and show an activity only slightly lower compared to noble metals at condition relevant for GT engines. Moreover their behavior under pressure is quite unknown. The need for low combustor pressure drops makes necessary the use of an appropriate substrate. For this reason particular attention was devoted to deposit efficaciously the catalysts powders over appropriate planar (α-Al2O3) and honeycomb monolithic (cordierite) substrates.
The materials used in this thesis were completely characterized by means of temperature programmed reductions of the different catalysts under H2 or CO flows. Results revealed that the reducibility of the catalysts, characteristic temperatures and reduction degrees strongly depends on the reducing agent. In particular, H2 is the most reducing agent for Pt, while perovskite preferentially interacts with CO. The bi-functional Pt-perovskite catalyst show intermediate properties with respect to the single phases.
Since the availability of reliable heterogeneous kinetic data is necessary for the correct description of the catalytic processes, CH4, CO and H2 combustions under isothermal conditions have been separately studied on the perovskite and the noble metal catalyst. Particular attention was devoted to study the fluid dynamics of the reactor and to characterize the mass transfer properties of the systems in order to find the conditions free from diffusion limitations. Moreover a proper reactor model was developed in order to find the best kinetic models.
Concerning the Pt catalyst, H2 combustion apart, in all cases it was possible to derive a simple reaction rate well fitting all experimental data; fractional rate expressions, derived from models including both fuel and oxygen adsorption, provided the best description of the experimental results. With regard to the Perovskite catalyst, in the investigated temperature range methane combustion rate can be expressed with a single fractional equation taking into account only methane adsorption. An apparent linear reaction rate could be used to fit the data only at atmospheric pressure. As a consequence, the extension of such kinetics at higher pressures leads to an overestimation of the reaction rate. The evidence that oxygen dependence is negligible is in agreement with literature data and is due to the occurrence of the reaction with lattice oxygen. On the contrary, both CO and H2 combustions on perovskite are influenced by changes of oxygen partial pressure. In both cases, the best models suggest the reaction of at least a fraction of the fuel with α-oxygen, generally weakly bonded to the catalyst surface. Moreover, according to the strong CO affinity with perovskite the CO combustion rate must take into account the negative effect of CO accumulation on the surface, leading to a less than linear reaction order with respect to the fuel.
As a general conclusion, excluding some conditions of H2 combustion on Pt, the effect of pressure on the combustion kinetics is positive even if less than linear.
Concerning the effect of the pressure under autothermal conditions, it was found that methane can be ignited simply by increasing the pressure, due to two concomitant effects: higher reaction rates, according to the conclusions of the kinetic study, and longer contact times, due to the reduction of the flow velocity. Moreover, once ignited, the pressure can be lowered without the occurrence of quenching phenomena, i.e. keeping stable operation.
A positive effect of Low BTU fuels co-feeding on methane light off has been detected on perovskite-based catalysts, eventually doped with Pt. As a matter of fact, lower pre-heating temperatures are needed in order to ignite methane. Ignition occurrence could be obtained by changing the operating pressure too. The main reason of such effect is due to thermal causes. As a matter of fact, depending on the catalyst formulation, low BTU fuels can be easily converted in the first part of the reactor and the produced heat increases the temperature (and consequently the kinetics) downstream up to the imbalance between generated and exchanged heat is reached
