Search results for "LTE"

Sunscreen analysis

2005

Although there are no official analytical methods for UV filters determination in sunscreen cosmetics, their maximum content are regulated by legislation, and then analytical methods to control these products are necessary. In this paper, analytical methods for UV filters determination in cosmetics, which can be found in the literature, are reviewed. The usefulness of the analytical methods, techniques and sample preparation is discussed. The analytical methods used for the determination of UV filters in other type of samples are commented upon. Moreover, a brief overview of the European Union legislation concerning UV filters is included.

Enhanced styrene removal in a two-phase partitioning bioreactor operated as a biotrickling filter: Towards full-scale applications

2017

Abstract Styrene vapor abatement was investigated in a two-phase partitioning bioreactor operated as a biotrickling filter (TPPB-BTF). The removal performance of the TPPB-BTF was simultaneously compared with a conventional BTF, which served as a control. Industrial-grade silicone oil was used as the non-aqueous phase in the TPPB-BTF due to its high affinity for styrene. Both bioreactors were operated at styrene inlet concentrations ranging from 55 to 323 mg C m −3 and empty bed residence times (EBRT) of 15–30 s, corresponding to pollutant loading rates of 13–77 g C m −3  h −1 . Both bioreactors exhibited styrene removal efficiencies (REs) higher than 90% at an EBRT of 30 s. Nevertheless, th…

Filter-based infrared detectors for high temperature size exclusion chromatography analysis of polyolefins: calibration with a small number of standa…

2012

Infrared detection has been shown to be very appropriate for high temperature analysis of polyolefins. After some early reports in which dispersive or single-band filter-based detectors were applied, Fourier transform detectors have been described for this application, in order to improve the method sensitivity. Modern simple filter-based detectors prove, however, comparable sensitivity while providing a number of practical advantages when coupled to chromatographic systems: reduced cell volume, simplified hardware, continuous generation of absorbance chromatograms, as well as simpler data collection and processing. A practical method for calibration, using multiple-band signals obtained wi…

Taxane analysis by high performance liquid chromatography-Nuclear magnetic resonance spectroscopy ofTaxus species

1998

High performance liquid chromatography–nuclear magnetic resonance spectroscopic analyses of taxane diterpenoids from three Taxus species were carried out employing a stopped-flow technique. Several taxanes have been identified from 500 mg leaf samples without prior isolation. © 1998 John Wiley & Sons, Ltd.

Analytical-numerical methods for investigation of hidden oscillations in nonlinear control systems

2011

The method of harmonic linearization, numerical methods, and the applied bifurcation the- ory together discover new opportunities for analysis of oscillations of control systems. In the present survey analytical-numerical algorithms for hidden oscillation localization are discussed. Examples of hidden attrac- tor localization in Chua's circuit and counterexamples construction to Aizerman's conjecture and Kalman's conjecture are considered.

Nuevos actores de la no violencia

2001

La sostenibilidad, un nuevo pensamiento. Intervención de José Vidal-Beneyto

2003

Número monográfico sobre "El nuevo horizonte de la Sostenibilidad". Fundación Santander Central Hispano.

Die Lehre von der Beihilfe

1892

Eine zur Erlangung des Grades eines Magisters des Strafrechts der Juristischen Fakultät der Kaiserlichen Universität zu Dorpat vorgelegte Abhandlung

Les cimetières celtiques du Bassin parisien (VIIe-IIe siècle av. J.-C.) : systèmes typologique et chronologique

2016

International audience; Les cimetières celtiques du Bassin parisien ont livré un riche ensemble d’artefacts. Leur analyse est restée longtemps difficile en l’absence de nomenclature utilisable. Luc Baray offre ici une synthèse complète des systèmes typologique et chronologique, s’appuyant sur plusieurs centaines d’objets mis au jour dans 1 500 sépultures, qui ont été décrits et classés en 905 types différents. Fondée sur une analyse morphométrique fine, cette étude propose six grands systèmes de classement typologiques pour les céramiques, les parures (torques, bracelets, bagues, anneaux de cheville, boucles d’oreilles, perles, pendeloques), les accessoires vestimentaires (fibules, ceinture…

Optimized Multipactor-Resistant Wedge-Shaped Waveguide Bandpass Filters

2013

[EN] Wedge-shaped waveguides present a certain advantage with respect to rectangular waveguides regarding their resistance to multipactor discharges. In this paper, the optimal configuration for the wedge geometry is investigated based on theoretical results, on a precise multipactor prediction tool, and on previous experience. In addition, design rules are presented, which allow us to achieve for wedge-shaped filters electrical performances comparable to the ones of rectangular waveguide filters, while at the same time improving the multipactor-free power range. As a proof of concept, two three-pole bandpass filters with equivalent electrical characteristic of 150-MHz bandwidth, centered a…