Search results for " Phase"

Ozone absorption in aqueous phenol solutions

1977

Abstract The rate of ozone absorption in aqueous solutions of phenol was measured in a wetted-wall laboratory absorber. The liquid and gas flow rates were fixed as well as the pH and temperature. The phenol concentration was varied in the range 2–300 ppm and the ozone partial pressure over an eight fold range. The gas phase resistance to mass transfer was determined by absorbing SO2 from an SO2N2 mixture in KOH aqueous solutions. The results have been interpreted by means of a simple kinetic assumption.

Chemische charakterisierung des kettenaufbaus und kristallisationsverhaltens von copolymeren aus 3,3-bis(chlormethyl)oxetan und β-propiolacton

1974

Aus 3,3-Bis(chlormethyl)oxetan (1) und β-Propiolacton (2) wurden durch kationische Polymerisation Copolymere hergestellt, in denen Propiolactoneinheiten bis zu einem Molenbruch von 0,16 eingebaut sind. Das Copolymerisationsverhalten wurde untersucht, und die Copolymerisationsparameter wurden bestimmt. Die Copolymeren wurden kristallisiert und die Einkristalle hinsichtlich ihrer Zusammensetzung und Morphologie charakterisiert. Durch selektive Umesterung in den amorphen Bereichen der suspendierten Einkristalle wurde die Verteilung der aus β-Propiolacton gebildeten Einheiten (PL) uber den Kristall untersucht, und die Ergebnisse mit Abbauversuchen an den gelosten Copolymeren wurden verglichen. …

Zur Struktur der Produkte der Reaktion vonE/Z-1-Benzolsulfonyl-3-(1-pentenyl)-indol mit N-Phenylmaleinimid: Ein erster Beitrag zur Konfigurations- un…

1988

The products2,3 of the reaction ofE/Z-1-benzenesulfonyl-3-(1-pentenyl)-indole (1) and N-phenylmaleimide were analysed by1H-NMR spectroscopy. Exemplarily, the structure elucidation of theendo-cyclo-adduct2 b was achieved by using several NMR techniques (diff. NOE-, INDOR-measurements, decoupling experiments, spectra simulation). The1H-NMR-spectroscopically gained prediction of relative configuration and conformation of2 b was supported on X-ray analysis. The cyclohexene ring of the new cycloadducts adopts in the liquid phase and in the crystal a slightly twisted boat conformation.

Maturation of a Key Resource – The Germanium-68/Gallium-68 Generator: Development and New Insights

2011

(68)Ge/(68)Ga radionuclide generators have been investigated for almost fifty years, since the cyclotron-independent availability of positron emitting (68)Ga via the (68)Ge/(68)Ga system had always attracted researches working in basic nuclear chemistry as well as radiopharmaceutical chemistry. However, it took decades and generations of research (and researchers) to finally reach a level of (68)Ge/(68)Ga radionuclide generator designs adequate to the modern requirements of radiometal labelling chemistry. Nevertheless, most of the existing commercial generator systems address aspects of (68)Ge breakthrough and safe synthesis of (68)Ga radiopharmaceuticals by adopting eluate post-processing …

Application of pressurized fluid extraction to determine cadmium and zinc in plants

2006

Abstract A procedure for the determination of Cd and Zn in plants is proposed. The metals are extracted by pressurized fluid extraction (PFE). Operational conditions are: pressure 1500 psi, temperature 75 °C, static time 5 min, flush volume 35%, purge time 60 s, cycles 1 and 1,2-diaminocyclohexane- N , N , N ′, N ′-tetraacetic acid (CDTA) 0.01 M at pH 4.5 as extracting solution. Determination of Zn is carried out by flame atomic absorption spectroscopy and depending on the concentration level, Cd content is determined by flame or electrothermal atomic absorption spectroscopy. Certified samples of Virginia tobacco leaves, tea leaves, spinach leaves, poplar leaves, a commercial spinach sample…

The honeymoon phase – what we know today about the factors that can modulate the remission period in type 1 diabetes

2016

Niektórzy pacjenci z cukrzycą typu 1 (T1DM) często wkrótce po rozpoczęciu leczenia insuliną wymagają podaży jej mniejszych dawek. W piśmiennictwie zjawisko to określa się okresem remisji lub miesiąca miodowego. U większości pacjentów remisja jest jedynie częściowa, natomiast w bardzo rzadkich przypadkach może być również całkowita. Ostatnie doniesienia sugerują, że odpowiednie leczenie oraz opieka i kontrola w trakcie fazy miesiąca miodowego mogą potencjalnie wydłużyć ten okres lub nawet całkowicie zatrzymać proces destrukcji pozostałych komórek ß. Z tego powodu ten okres choroby budzi tak wielkie zainteresowanie. Faza remisji następuje zwykle około 3 miesiący po rozpoczęciu leczenia insuli…

Failures to act responsibly: The role of firm’s competitiveness in the post-scandal phase

2016

Shift-Invariant Canonical Polyadic Decomposition of Complex-Valued Multi-Subject fMRI Data with a Phase Sparsity Constraint

2020

Canonical polyadic decomposition (CPD) of multi-subject complex-valued fMRI data can be used to provide spatially and temporally shared components among groups with both magnitude and phase information. However, the CPD model is not well formulated due to the large subject variability in the spatial and temporal modalities, as well as the high noise level in complex-valued fMRI data. Considering that the shift-invariant CPD can model temporal variability across subjects, we propose to further impose a phase sparsity constraint on the shared spatial maps to denoise the complex-valued components and to model the inter-subject spatial variability as well. More precisely, subject-specific time …

THE PERFORATED BUILDING’S ENVELOPE: GUIDING THE EARLY DESIGN PHASES

In passato gli involucri edilizi perforati sono stati talvolta ricondotti ad alcuni elementi architettonici tradizionali (come, ad esempio, la ‘Mashrabiyya’), in cui gli elementi forati acquisiscono quasi significati archetipici, nell’assumere ruoli tecnologici e ambientali che rispecchiano i valori della comunità, le condizioni socio-economiche e le esigenze ambientali degli occupanti. Oggi, invece, l’involucro edilizio perforato costituisce una tendenza architettonica che ha iniziato a manifestarsi a livello globale all’inizio del nuovo millennio, alla quale ha contribuito l’emergere della tecnologia digitale con i suoi effetti sull’innovazione di tecniche, materiali, realizzazioni, prest…

A strong electroweak phase transition from the inflaton field

2016

We study a singlet scalar extension of the Standard Model. The singlet scalar is coupled non-minimally to gravity and assumed to drive inflation, and also couple sufficiently strongly with the SM Higgs field in order to provide for a strong first order electroweak phase transition. Requiring the model to describe inflation successfully, be compatible with the LHC data, and yield a strong first order electroweak phase transition, we identify the regions of the parameter space where the model is viable. We also include a singlet fermion with scalar coupling to the singlet scalar to probe the sensitivity of the constraints on additional degrees of freedom and their couplings in the singlet sec…