Search results for "VOLUME"
showing 10 items of 1932 documents
Dobór metody oceny czystości mikrobiologicznej powietrza w zakładach przemysłu spożywczego
2016
Small-angle neutron scattering from lecithin reverse micelles
1996
Abstract We report new results of small-angle neutron scattering from cyclohexane- d 12 /lecithin/water micellar solutions, performed as a function of the water content, w 0 , the temperature, T and the dispersed-phase volume fraction, ф. The data from dilute samples can be interpreted in terms of the existence of giant cylindrical reverse micelles, in good agreement with the current idea of an unlimited micellar growth with ф. In contrast, the appearance of a sharp interference maximum at high concentrations ( ф > 0.15 ) suggests that the current hypothesis of a gel structure interpreted as a random network of entangled micelles can be assumed to be incorrect, and that there must be some c…
Free-volume Study in GeS2-Ga2S3-CsCl Chalcohalide Glasses Using Positron Annihilation Technique
2015
Abstract Positron annihilation lifetime spectroscopy combined with Doppler broadening of annihilation radiation was applied to study free-volume entities in Ge-Ga-S glasses having different amount of CsCl additives. It is shown that the structural changes caused by CsCl additives can be adequately described by positron trapping modes determined within two-state model. The results testify in a favor of rather unchanged nature of corresponding free-volume voids responsible for positron trapping in the studied glasses, when mainly concentration of these traps is a subject to most significant changes with composition.
Estudio del desarrollo y la función renal, y de aspectos implicados en el síndrome metabólico del adulto, en gemelos con peso dispar al nacimiento. V…
2022
Barker DJP et al fueron los primeros en resaltar, hace 33 años, la importancia que tiene el peso al nacimiento como factor de riesgo para el desarrollo en el adulto de enfermedad isquémica del corazón, principal causa de mortalidad a nivel mundial. Posteriormente, a esta hipótesis de la programación fetal de las enfermedades del adulto, se incluyeron otras enfermedades crónicas no transmisibles como hipertensión arterial, la diabetes mellitus tipo 2 y la obesidad, formando parte todas ellas del llamado síndrome metabólico o síndrome de resistencia insulínica, junto a dislipemia. Cada una de ellas por separado, incrementan el riesgo de sufrir enfermedad isquémica del corazón y aceleran la ap…
Volumetriskā ekrāna gaišuma uztvere
2019
Bakalaura darbs ir uzrakstīts latviešu valodā uz 32 lappusēm. Tas satur 9 attēlus, 3 tabulas, 51 atsauci uz literatūras avotiem. Darba mērķis bija raksturot gaišuma uztveri redzes stimuliem uz dažādām volumetriskā ekrāna plaknēm. Pētījumā piedalījās 15 dalībnieki vecumā no 20 līdz 25 gadiem. Redzes stimuli tika demonstrēti uz diviem ekrāniem – volumetriskā ekrāna un šķidro kristālu ekrāna. Psihofizikālā testa laikā tika noteikta vismazākā atšķirība abu redzes stimulu gaismas intensitātē, pie kuras dalībnieki uzskatīja stimulus par vienādi gaišiem uz abiem ekrāniem. Iegūtie rezultāti būtiski atšķīrās indivīdu starpā, tomēr vidējās gaišuma uztveres sliekšņa vērtības nebija atšķirīgas, kad vie…
A fully automatic method for biological target volume segmentation of brain metastases
2016
Leksell Gamma Knife is a mini-invasive technique to obtain a complete destruction of cerebral lesions delivering a single high dose radiation beam. Positron Emission Tomography (PET) imaging is increasingly utilized for radiation treatment planning. Nevertheless, lesion volume delineation in PET datasets is challenging because of the low spatial resolution and high noise level of PET images. Nowadays, the biological target volume (BTV) is manually contoured on PET studies. This procedure is time expensive and operator-dependent. In this article, a fully automatic algorithm for the BTV delineation based on random walks (RW) on graphs is proposed. The results are compared with the outcomes of…
The effect of plasticity in crumpling of thin sheets
2008
Bridging the gap between theoretical and experimental work to understand the effect of plasticity on the crumpling of thin sheets into a small volume has proved difficult. A realistic numerical model now makes a distinction between elastic and elasto-plastic behaviour. Crumpling a thin sheet of material into a small volume requires energy for creating a network of deformations such as vertices and ridges1,2. Scaling properties of a single elastic vertex3,4,5 or ridge have been analysed theoretically6,7,8, and crumpling of a sheet by numerical simulations1,9,10. Real materials are however elasto-plastic11,12,13,14,15 and large local strains induce irreversible plastic deformations. Hence, a …
CO 2 output and δ 13 C(CO 2 ) from Mount Etna as indicators of degassing of shallow asthenosphere
1997
An estimated average CO2 output from Etna's summit craters in the range of 13±3 Mt/a has recently been determined from the measured SO2 output and measured CO2/SO2 molar ratios. To this amount the CO2 output emitted diffusely from the soil (≈ 1 Mt/a) and the amount of CO2 dissolved in Etna's aquifers (≈ 0.25 Mt/a) must be added. Data on the solubility of CO2 in Etnean magmas at high temperature and pressure allow the volume of magma involved in the release of such an amount of this gas to be estimated. This volume of magma (≈ 0.7 km3/a) is approximately 20 times greater than the volume of magma erupted annually during the period 1971–1995. On the basis of C-isotopic data of CO2 collected in…
Chapter 16 Pre-eruptive vapour and its role in controlling eruption style and longevity at Soufrière Hills Volcano
2014
We use volatiles in melt inclusions and nominally anhydrous phenocrysts, with volcanic gas flux and composition, and textural analysis of mafic inclusions to estimate the mass of exsolved vapour prior to eruption at Soufriere Hills Volcano (SHV). Pre-eruptive andesite coexists with exsolved vapour comprising 1.6–2.4 wt% of the bulk magma. The water content of orthopyroxenes indicates a zone of magma storage at pressures of approximately 200–300 MPa, whereas melt inclusions have equilibrated at shallower pressures. Inclusions containing >3 wt% H2O are enriched in CO2, suggesting flushing with CO2-rich gases. Intruding mafic magma contains >8 wt% H2O at 200–300 MPa. Rapid quenching is accompa…
Effect of the abundance of three predominating copepod species on adequate sample volume and sample size in Bransfield Strait (Antarctic Peninsula) a…
1992
The effect on adequate sample size and sample volume of the abundances of three predominant copepod species, Metridia gerlachei, Calanus propinquus and Calanoides acutus, were studied in Bransfield Strait (Antarctic Peninsula) in the austral summer of 1988–1989 and waters north of the Weddell Sea in 1989–1990. Copepod abundances were higher in the area north of the Weddell Sea, with the exception of Metridia gerlachei, which was evenly distributed over both areas. Local (intra-station) patchiness was not found, indicating random distribution over small areas. In the assessment of inter-station variability in Bransfield Strait, with standard error of the mean set arbitrarily at 20% of the av…