Characterization of polylactic acid films for food packaging as affected by dielectric barrier discharge atmospheric plasma

Dielectric barrier discharge (DBD) air plasma is a novel technique for in-package decontamination of food, but it has not been yet applied to the packaging material. Characterization of commercial polylactic acid (PLA) films was done after in-package DBD plasma treatment at different voltages and treatment times to evaluate its suitability as food packaging material. DBD plasma increased the roughness of PLA film mainly at the site in contact with high voltage electrode at both the voltage levels of 70 and 80 kV. DBD plasma treatments did not induce any change in the glass transition temperature, but significant increase in the initial degradation temperature and maximum degradation temperature was observed. DBD plasma treatment did not adversely affect the oxygen and water vapor permeability of PLA. A very limited overall migration was observed in different food simulants and was much below the regulatory limits. Industrial relevance: In-package DBD plasma is a novel and innovative approach for the decontamination of foods with potential industrial application. This paper assesses the suitability of PLA as food packaging material for cold plasma treatment. It characterizes the effect of DBD plasma on the packaging material when used for in-package decontamination of food. The work described in this research offers a promising alternative to classical methods used in fruit and vegetable industries where in-package DBD plasma can serve as an effective decontamination process and avoids any post-process recontamination or hazards from the package itself.

Estimation of satellite antenna phase center offsets for Galileo

Satellite antenna phase center offsets for the GalileoInOrbitValidation(IOV) and FullOperationalCapability (FOC) satellites are estimated by two different analysiscenters based on tracking data of a global GNSS network. The mean x- and y-offsets could be determined with a precision of a few centimeters. However, daily estimates of thex-offsets of the IOV satellites show pronounced systematic effects with a peak-to-peak amplitude of up to 70 cm that depend on the orbit model and the elevation of the Sun above the orbital plane. For the IOV y-offsets, no dependence on the orbit model exists but the scatter strongly depends on the elevation of the Sun above the orbital plane. In general, these systematic effects are significantly smaller for the FOC satellites. The z-offsets of the two analysis centers agree within the 10–15 cm level, and the time series do not show systematic effects. The application of an averaged Galileo satellite antenna model obtained from the two solutions results in a reduction of orbit day boundary discontinuities by up to one third—even if an independent software package is used.

A synthesis method for broad-band antenna impedance matching networks /

Vita.

Analysis and design of the log-periodic dipole antenna.

At head of title: Antenna Laboratory.

The equiangular spiral antenna /

"Contract AF33(616)-3220 Project No. 6(7-4600), Task No. 40572, Wright Air Development Center."

The characteristic impedance of the fin antenna of infinite length /

"Contract No. AF33(616)-3220 Project No. 6(7-4600) Task 40572 Wright Air Development Center"

Directional characteristics of a u-shaped slot antenna /

"Contract AF33(616)-3220 Project No. 6(7-4600) Task 40572 Wright Air Development Center"

An analytical study of spaced loop ADF antenna systems /

"Contract No. AF33(616)-3220 Project No. 6(7-4600) Task 40572 Wright Air Development Center."

Input impedance of a spherical ferrite antenna with a latitudinal current /

"Contract No. AF33(616)-310 RDO No. R-112-110 SR-6f2"

A unidirectional equiangular spiral antenna /

"Contract AF33(616)-3220 Project No. 6(7-4600) Task 40572 Wright Air Development Center"

The asymmetrically excited spherical antenna /

"Contract No. AF33(616)-310 RDO No. R-112-110 SR-6f2"

Coupling of antenna elements to a circular surface waveguide /

"Contract No. AF33(616)-310 RDO No. R-112-110 SR-6f2"

Evaluation of cross-correlation methods in the utilization of antenna systems /

Contract AF33(616)-6079 Project No. 9-(13-6278) Task 40572. Sponsored by: Wright Air Development Center"

Non-planar logarithmically periodic antenna structures /

"Contract AF33(616)-3220 Project No. 6(7-4600) Task 40572 Wright Air Development"

An analytical and experimental study of the ionized flow field about a hemisphere cylinder and its effect on the radiation pattern of a slot antenna

Mode of access: Internet.