Search results for "performance"
showing 10 items of 4457 documents
HPTLC Phenolic Profiles as Useful Tools for the Authentication of Honey
2018
The present study reveals the utility of high-performance thin-layer chromatographic (HPTLC) fingerprinting of phenolic constituents for the authentication of monofloral honeys. The obtained data enables a more complete assessment of honey quality and the identification of emerging threats to honey quality. The developed procedure facilitates differentiation of varietal honeys and detection of honey adulterations. We used an HPTLC fingerprint analysis to determine the characteristic patterns of different honey types (willow, buckwheat, heather, pine honeydew, and manuka honey). The HPTLC chromatograms were used to determine the differences in the botanical origin of the honey samples on the…
Thermoeconomic Analysis Under Dynamic Operating Conditions for Space Heating and Cooling Systems in Small Residential Buildings
2018
Due to the social concern for energy savings and ecological improvement necessity in the performance of buildings, new analysis tools emerged. Thermoeconomics connects the physics and economics of energy conversion processes through the second law of thermodynamics. A limited number of thermoeconomic applications in buildings have been proposed, due to the difficulties in dealing with very irregular energy load profiles and unsteady plant operating conditions, which require the use of dynamic approaches that increase the complexity of the method. The present study highlights the potential of thermoeconomics as a support for decision making, due to the capability to identify trade-offs betwe…
''No Gender Difference in Peak Performance in Ultra-Endurance Swimming Performance - Analysis of the 'Zurich 12-h Swim' from 1996 to 2010''
2012
Eichenberger, Evelyn | Knechtle, Beat | Christoph, Alexander Rust | Knechtle, Patrizia | Lepers, Romuald | Rosemann, Thomas; International audience; ''The aims of the study were to [1] investigate the performance trends at the 'Zurich 12-h Swim' in Switzerland from 1996 to 2010; and [2] determine the gender difference in peak performance in ultra-endurance swimming. In total, 113 male and 53 female swimmers competed in this indoor ultra-endurance event while swimming in a heated pool. The number of male participants significantly increased (r(2) = 0.36, P = 0.04) over time while the participation of females remained unchanged (r(2) = 0.12, P = 0.26). In the age group 0.05). The best perform…
False-positive LSD testing in urine samples from intensive care patients.
1998
Unexpected positive results for lysergic acid diethylamide (LSD) were found in urine samples from 12 patients in an intensive care unit in a routine screening using the CEDIA DAU assay. None of these test results could be confirmed by high-performance liquid chromatography analysis, but all samples contained the mucolytic drug ambroxol. Further studies demonstrated that ambroxol exhibits a significant cross-reactivity in the CEDIA DAU LSD assay. Therefore, positive LSD results obtained with the CEDIA DAU assay have to be critically evaluated, particularly during the cold season, when infections of the respiratory tract often result in more frequent use of mucolytic medications.
Assays for Detection of Fungal Hallucinogens Such as Psilocybin and Psilocin
2016
Abstract Methods applicable to the detection of hallucinogenic indole compounds, namely psilocybin, psilocin, and related molecules, that have been developed so far for purposes of mycological research, toxicological studies, or forensic investigations are described in this chapter. The most current literature as well as some interesting older publications are cited, providing a historical overview of the subject. Methods of qualitative and quantitative analysis are presented. Additionally, preliminary purification steps and sample treatment before the exact quantitative determination are proposed. The methods described utilized various analytical techniques for the measurement of psilocybi…
The affect of contact force sensations on user performance in virtual assembly tasks
2007
International audience; Abstract The development of a realistic virtual assemblyenvironment is challenging because of the complexity of the physical processes and the limitation of available VRtechnology. Many research activities in this domain pri-marily focused on particular aspects of the assembly task such as the feasibility of assembly operations in terms of interference between the manipulated parts. The virtualassembly environment reported in this research is focusedon mechanical part assembly. The approach presented ad-dresses the problem of part-to-part contacts during themating phase of assembly tasks. The system describedcalculates contact force sensations by making their inten-s…
Extending SSD lifetime in database applications with page overwrites
2013
Flash-based Solid State Disks (SSDs) have been a great success story over the last years and are widely used in embedded systems, servers, and laptops.One often overlooked ability of NAND flash is that flash pages can be overwritten in certain circumstances. This can be used to decrease wear out and increase performance.In this paper, we analyze the potential of overwrites for the most used data structure in database applications: the B-Tree. We show that with overwrites it is possible to significantly reduce flash wear out and increase overall performance.
Dynamic Potential of Feedback in Self-Regulated Learning and Motivation of Children with Mathematical Learning Difficulties
2017
Ovim istraživanjem želio se ispitati učinak vrste povratnih informacija (feedback-a) na učenje i motivaciju djece s teškoćama u učenju matematike. Procijenjena je izvedba 76-ero djece - polaznika petih razreda na zadacima računanja, kao i njihova motivacija za rješavanje matematičkih zadataka, s obzirom na vrstu povratne informacije: trenutnu korektivnu povratnu informaciju te odgođenu konvencionalnu povratnu informaciju. Rezultati istraživanja pokazali su da su djeca imala značajno bolji rezultat kada im je bila pružena trenutna korektivna povratna informacija, nego kada im je pružena odgođena konvencionalna povratna informacija. Rezultati također ukazuju da pružanje trenutne povratne info…
Non-Thermal Ultrasonic Extraction of Polyphenolic Compounds from Red Wine Lees
2020
This study presents the results of conventional aqueous (CE) and non-conventional ultrasound-assisted (UAE) extractions of polyphenolic compounds from lees extracts of red wine varieties (Merlot and Vranac). The effect of ultrasound extraction time (t, s), and amplitude (A,%) from a 400 W ultrasound processor with different ultrasonic probes diameters (Ds, mm) on the amount and profile of polyphenolic compounds in the obtained extracts was investigated and compared to CE. The optimal conditions resulting in maximum extraction of phenolic compounds were: Probe diameter of 22 mm, amplitude 90% and extraction time for Vranac wine lees 1500 s and for Merlot wine lees extraction time of 1361 s. …
Happy-Productive Teams and Work Units: A Systematic Review of the ‘Happy-Productive Worker Thesis’
2019
The happy-productive worker thesis (HPWT) assumes that happy employees perform better. Given the relevance of teams and work-units in organizations, our aim is to analyze the state of the art on happy-productive work-units (HPWU) through a systematic review and integrate existing research on different collective well-being constructs and collective performance. Research on HPWU (30 studies, 2001-2018) has developed through different constructs of well-being (hedonic: team satisfaction, group affect; and eudaimonic: team engagement) and diverse operationalizations of performance (self-rated team performance, leader-rated team performance, customers' satisfaction, and objective indicators), t…