UML-based performance engineering possibilities and techniques

An information system's performance in relation to time and resources is largely determined by the design selected in software development. Performance engineering's core concept accounts for a software system's performance from the earliest development phases. Unfortunately, these measures are not performed explicitly during software development, primarily because of deadline pressure, the information system's complexity, or lack of knowledge of what PE means. The authors overview UML-based PE, analyze corresponding approaches, and examine the advantages of the tools available     

Differentialthermoanalytische Untersuchungen zur effektivität einiger Stabilisatoren bei Polyäthylenterephthalat

The thermooxidative resistance of poly(ethylene terephthalate), synthesized in the presence of different stabilizers as well as combinations of stabilizers as well as combinations of stabilizers, is studied with the help of the dynamic and isothermal DTA-method. The stabilization coefficients (by the dynamic DTA) and the characteristic induction periods (by the isothermal DTA) are determined. A good correlation is established between the data obtained by both methods.     

Stereospecific analysis of triglycerides from apple seed endosperm

Triglyceride composition and stereospecific distribution of fatty acids in apple seed oil are reported. Results are compared with proposed distribution theories.     

Die mechanisch-chemische degradation von polymeren bei der verarbeitungstemperatur

There is a number of questions that remains unanswered by the literature regarding mechano-chemical degradation of plastics at the temperatures of processing. The investigations described here were carried out to determine the degree to which different polymers are degraded at the temperatures of processing under the influence of mechanical forces and to determine the relationship between melt viscosity and degree of degradation, as well as to understand the mechanism and the kinetics of degradation.     

Patulin in fruit juices: occurrence,bioaccessibility, and risk assessment for Serbian population

This paper reports the first study of patulin occurrence in fruit juices and risk assessment related to patulin intake by children, adolescents and adults in Serbia. During 3 consecutive years (2013–2015), 142 fruit (apple or multi-fruit) juices were collected from the market and analysed using HPLC-UV. Patulin was found in 51.4% of juices with 0.7% of the samples in excess of the legal limit of 50 μg kg^?1 (mean 4.3 μg kg^?1). Apple juices showed significantly higher percentage of contaminated samples (74.0% vs 27.5%), as well as higher mean patulin content (6.4 vs 2.1 μg kg^?1) when compared with the multi-fruit ones. Bioaccessibility of patulin in fruit juices was studied using the standardised in vitro digestion method. A mean of 21.6% of the initial patulin amount reached the end of the intestinal phase showing a significant reduction of this toxin during the human digestion process. Risk assessment of patulin intake by Serbian children, adolescents and adults, conducted by deterministic and probabilistic approaches and including the bioaccessibility results, revealed no health concern. Although patulin alone does not represent risk, further research should consider its co-occurrence with other toxic substances in food and potential adverse effects of their mixtures.     

Determination of energy and spatial distribution of oxide border traps in In0.53Ga0.47As MOS capacitors from capacitance–voltage characteristics measured at various temperatures

In this work, we have systematically studied the frequency dispersion of the capacitance–voltage (C–V) characteristics of In_0.53Ga_0.47As metal–oxide-semiconductor (MOS) capacitors in accumulation region at various temperatures based on a distributed border traps model. An empirical method to evaluate the frequency and temperature dependent response of the border traps distributed along the depth from the interface into the oxide is established. While the frequency dependent response results from the dependence of the time constant of the border traps on their depths, the temperature dependent response is ascribed to the thermal activated capture cross-section of the border traps due to the phonon-related inelastic capturing process. Consequently, it is revealed that the frequency dispersion behaviors of the accumulation capacitance at different temperatures actually reflect the spatial distribution of the border traps. On this basis, we propose a methodology to extract the border trap distribution in energy and space with emphasis on analyzing the C–V characteristics measured from low to high temperatures in sequence.