113,078 research outputs found
How does the pre-massage and post-massage 2-glass test compare to the meares-stamey 4-glass test in men with chronic prostatitis/chronic pelvic pain syndrome?
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The thermal decomposition reactions of bis(pyridine-2-aldoxime)-copper(II) complexes
No full textThe thermal properties of [Cu(HL)L]Cl (HL = pyridine-2-aldoxime), [Cu(HL)2]Cl2, and CuL2 were studied in vacuo and in dynamic N2 and O2 gas atm. by thermogravimetry (TG), differential TG, DTA, UV-visible, IR, diffuse reflectance, and mass spectra. The initial decompn. temp. is affected by the no. of acid hydrogens in the complex; the thermal stability sequence in vacuo is: [Cu(HL)LCl > [Cu(HL)2]Cl2 > CuL2. The thermal decompn. reactions occur in several sep. steps, the 1st of which gives rise to partial ligand decompn., the redn. of Cu(II) to Cu(I), and the conversion of the residual HL into acid amide
Convolutional Autoencoder for the Spatiotemporal Latent Representation of Turbulence
No full textTurbulence is characterised by chaotic dynamics and a high-dimensional state space, which make this phenomenon challenging to predict. However, turbulent flows are often characterised by coherent spatiotemporal structures, such as vortices or large-scale modes, which can help obtain a latent description of turbulent flows. However, current approaches are often limited by either the need to use some form of thresholding on quantities defining the isosurfaces to which the flow structures are associated or the linearity of traditional modal flow decomposition approaches, such as those based on proper orthogonal decomposition. This problem is exacerbated in flows that exhibit extreme events, which are rare and sudden changes in a turbulent state. The goal of this paper is to obtain an efficient and accurate reduced-order latent representation of a turbulent flow that exhibits extreme events. Specifically, we employ a three-dimensional multiscale convolutional autoencoder (CAE) to obtain such latent representation. We apply it to a three-dimensional turbulent flow. We show that the Multiscale CAE is efficient, requiring less than 10% degrees of freedom than proper orthogonal decomposition for compressing the data and is able to accurately reconstruct flow states related to extreme events. The proposed deep learning architecture opens opportunities for nonlinear reduced-order modeling of turbulent flows from data.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Aerodynamic
α-blockers and antibiotics, alone or in combination, improve symptoms in men with chronic prostatitis/chronic pelvic pain syndrome.
No full textMaltodextrins as drying auxiliary agent for the preparation of easily resuspendable nanoparticles
No full textTo increase the long-term stability of poly(D,L-lactide-co-glycolide) nanoparticles (NP) a drying step is mandatory. Spray- and freeze-drying can induce their irreversible aggregation and, therefore, the use of a drying auxiliary agent is necessary. The aim of this work was to explore the ability of four grades of maltodextrins (MDX) as NP’s auxiliary agent in spray- and freeze-drying.
PLGA NP were prepared by the solvent displacement method, using a polymer with a Tg of 36.5 °C. Compatibility was evaluated by DLS, after stirring NP with solutions of MDX (DE2, DE6, DE12 and DE38) at 2, 4 and 8% w/v concentrations using water or 0.9% NaCl as dispersants. Spray-drying process conditions were optimized by a Design of Experiment. Freeze-drying cycles were designed based on the thermal properties of MDX solutions. Dried products were reconstituted in water or 0.9% NaCl under gentle stirring and characterized by DLS after 5, 30 and 60 min.
NP had a monomodal size distribution with a size of about 160 nm and a Z-potential (z) of -31 mV. NP were compatible with all the aqueous solutions of MDX at all concentrations, even if DLS revealed a slight increment of NP size as a function of MDX grade and concentration. A concomitant increase of z was less evident for MDX DE2 and DE38 compared to DE6 and DE12, with values of about -26 and -24 mV, respectively. In 0.9% NaCl solution, only MDX DE2 and DE38 did not induce NP aggregation. These results appeared related to the organization of MDX onto NP surface, since both the z and the apparent persistence length of hydrated MDX [1] followed the same trend. Independently of the drying method, after reconstitution of the dried products, MDX DE2 was not effective in preserving NP features (size>400 nm). Conversely, MDX DE38 allowed an easy and complete reconstitution of NP. Its optimal concentrations resulted in the 2-4% w/v range. Indeed, monodisperse NP were obtained after 5 min of reconstitution independently of medium ionic strength (spray-dried product prepared by 2%w/v MDX DE38: 172±12 nm; freeze-dried product prepared by 4%w/v MDX DE38: 188±6 nm).
In conclusion, MDX DE38 appears an efficacious drying auxiliary agent for NP at concentrations lower than those reported in literature for polyols and sugars, independently of the drying process.
References
[1] Aeberhardt K., De Saint Laumer J.Y., Bouquerand P.E., Normand V. Ultrasonic wave spectroscopy study of sugar oligomers and polysaccharides in aqueous solutions: The hydration length concept. International Journal of Biological Macromolecules, 36(5), 275–282, 2005
Altre cause di obbligazioni
No full textGESTIONE DI AFFARI, PAGAMENTO DELL’INDEBITO, OBBLIGAZIONI NATURALI, PAGAMENTO DELL'INDEBITO, ARRICCHIMENTO SENZA CAUS
Reaction of chromium(III) and iron(III) with pyridine-2-aldoxime in acidic aqueous medium
No full textMolar absorptivities and equil. consts. for 1:1, 1:2, 1:3, and 2:1 Cr3+ and Fe3+ complexes with pyridine-2-aldoxime were detd. in 0.5M NaClO4 at 25° by spectrophotometry. Hydrolysis occurs above pH 5.5 and 4.0, resp. The mononuclear complexes contain only M-N bonds (to oxime and pyridine N). The dinuclear complexes must contain M-O bonds (to oxime
Prostatic calcifications and symptoms of chronic prostatitis/chronic pelvic pain syndrome
No full textRe: Samplaski et al.: Inclusion of erectile domain to UPOINT phenotype does not improve correlation with symptom severity in men with chronic prostatitis/chronic pelvic pain syndrome. (Urology 2011;78:653-658).
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