Search results for "flow [Keywords]"
showing 10 items of 469 documents
Darbu plānošanas optimizācijas problēmu risināšana ar binārās programmēšanas metodēm
2016
Darbā aprakstītas trīs dažādas flow shop problēmas ar uzdevumu minimizēt kopējo darbu izpildes laiku: permutation flow shop problēma, blocking flow shop problēma un no-wait flow shop problēma. Katrai no problēmām ir atrasts atbilstošais lineārās programmēšanas uzdevums ar veseliem un bināriem mainīgajiem. Problēmu risināšanai ir aprobētas divas klasiskās metodes, ko izmando diskrētās programmēšanas uzdevumiem: Gomorī apgriešanas metode un sazarošanās un robežu algoritms. Skaitliskie aprēķini tika veikti, izmantojot datorprogrammu LPSolve IDE.
Polypropylene/polyhedral oligomeric silsesquioxane nanocomposites – study of free volumes, crystallinity degree and mass flow rate
2016
Nanokompozyty polipropylen/poliedryczne oligomeryczne silseskwioksany (PP/POSS) przygotowano metodą mieszania w stanie stopionym polimeru. Wpływ struktury oraz ilości zastosowanych nanonapełniaczy POSS na objętości swobodne w polipropylenie określono z zastosowaniem spektroskopii czasów życia pozytonów (PALS). Ustalono zależności pomiędzy parametrami PALS: czasem życia o-Ps (τ3) i natężeniem (I3) składowej o-Ps oraz wartościami stopnia krystaliczności (Xc ) i masowego wskaźnika szybkości płynięcia (MFR) badanych materiałów. Obecność nanonapełniaczy POSS wpłynęła na liczbę i rozmiary objętości swobodnych w polimerze, co spowodowało zmianę mikrostruktury osnowy polipropylenowej. Wraz ze zwięk…
Research in reduction of meters under registration: experience and results achieved in field tests and in laboratory in Palermo
2010
Practical Strategies for Stable Operation of HFF-QCM in Continuous Air Flow
2013
Currently there are a few fields of application using quartz crystal microbalances (QCM). Because of environmental conditions and insufficient resolution of the microbalance, chemical sensing of volatile organic compounds in an open system was as yet not possible. In this study we present strategies on how to use 195 MHz fundamental quartz resonators for a mobile sensor platform to detect airborne analytes. Commonly the use of devices with a resonant frequency of about 10 MHz is standard. By increasing the frequency to 195 MHz the frequency shift increases by a factor of almost 400. Unfortunately, such kinds of quartz crystals tend to exhibit some challenges to obtain a reasonable signal-to…
Phytoplankton dynamics in a shallow, hypertrophic reservoir (Lake Arancio, Sicily)
1994
Phytoplankton abundance and composition in the hypertrophic man-made Lake Arancio was analyzed, based on a programme of weekly sampling from May 1990 to November 1991 and supported by measurements of limnological parameters. The highest value of phytoplankton biomass (78 mg l-1) was observed in October 1990, during a bloom of the desmid Closterium limneticum var. fallax, while the lowest (0.15 mg l-1) was measured in April 1991. During spring, autumn and winter 1990, species of the genus Closterium dominated the community, in the sequence: C. aciculare, C. limneticum var. fallax, C. limneticum. The summer community was more diverse with the predominance of organisms belonging to Chlorophyce…
Entropic model application to identify cross-sectional flow effect on velocity distribution in a large amplitude meandering channel
2020
Abstract Literature shows the application of the entropy concept in open channels flow. No existing research has been addressed to the application of the entropy concept for evaluating the effect of secondary flow which especially develops in curved channels. The purpose of this paper is to explore the possibility to evaluate the effect of the secondary flow on the stream-wise velocity distribution starting only from the knowledge of the surface velocity and the entropic concept application. The analysis is conducted with the aid of data collected in a large-amplitude meandering laboratory flume for two different values of the width-to-depth ratio. Results show that the location of the maxi…
Blood Flow Restriction Exercise: Considerations of Methodology, Application, and Safety
2020
Comment on "Measuring the flow resistance of submerged grass"
2004
In this short note, the experimental data of Wilson and Horritt (2002.Hydrological Processes16: 2589–2598), jointlywith the measurements by Kouwenet al. (1969.Journal of Irrigation and Drainage Division, ASCE95: 329–342)and by Raffaelliet al. (2002 InProceedings XXVIII Convegno di Idraulica e Costruzioni Idrauliche, Cosenza, Italy;223–230), arefirstly used to test Kouwen’s approach. All experimental data are then used to calibrate aflow resistanceequation that was theoretically deduced by dimensional analysis and self-similarity theory
Cztery swobody wspólnego rynku Euroazjatyckiej Unii Gospodarczej
2016
Flow barriers : What prevents software developers from experiencing flow in their work
2022
Software development requires high problem-solving skills and creativity, making it a profession with good opportunities to become immersed in a flow experience. The characteristics of flow experience are absorption, enjoyment, and intrinsic motivation toward the activity. This study aims to better understand the barriers that prevent software developers from experiencing flow at work. Previous research has mostly examined software developers’ productivity, flow being one component of productive workdays. This study addresses the research gap by exploring the barriers to experiencing flow in software development. A qualitative questionnaire was used to gather data about flow experiences fro…