Search results for " Satu"
showing 10 items of 360 documents
Effect of cultivation techniques on the hydrodynamic and mechanical behaviour of the "Lauragais-terreforts"
1993
The effect of various seed bed preparations on hydrodynamic and mechanical parameters was studied experimentally by simulated rainfall on clayeyloamy soils Lauragais, which had developed on chalky molasse on a slope greater than 12 %. The level of soaked up rain ("pluie d'imbibition", Pi) is closely connected to the inital degree of saturation of the soil ; it varies from 10 to 24 mm when the soil is humid and increases when the soil is dry (14 to 47 mm). But when the soil surface is crusted the Pi is less and seems to be no longer controlled by the degree of water in the soil. Treatments with fine structural elements show the fewest possibilities of infiltration during the soaking up stage…
Elementu satura izvērtējums Pardenču laukā Skrīveros augušās parastajās apšubekās (Leccinum Auranriacum)
2015
Elementu satura izvērtējums Pardenču laukā Skrīveros augušās parastajās apšubekās (Leccinum Aurantiacum) Haļiullina A., zinātniskais vadītājs Dr. chem. Rudoviča V. Bakalaura darbs, 41 lappuses, 10 tabulas, 31 literatūras avoti, 4 pielikumi. Latviešu valodā. Bakalaura darbā tika noteikta cinka (Zn), vara (Cu), svina (Pb), hroma (Cr), kadmija (Cd) un arsēna (As) masas daļa parastajās apšubekās (Leccinum Aurantiacum). Sēnes tika lasītas Skrīveros LLU Zemkopības zinātniskā institūta (ZZI) apsaimniekotajos laukos ierīkotā daudzfunkcionālā plantācijā. Augsnes mēslošanai, kurā auga sēnes, tika izvēlēti šādi mēslošanas līdzekļi - pelni, dūņas, digestāts. Elementu masas koncentrācijas šķīdumos tika …
Alma Mater: 2012/ Ziema
2012
Ocean acidification affects fish spawning but not paternity at CO2 seeps
2016
Fish exhibit impaired sensory function and altered behaviour at levels of ocean acidification expected to occur owing to anthropogenic carbon dioxide emissions during this century. We provide the first evidence of the effects of ocean acidification on reproductive behaviour of fish in the wild. Satellite and sneaker male ocellated wrasse (Symphodus ocellatus) compete to fertilize eggs guarded by dominant nesting males. Key mating behaviours such as dominant male courtship and nest defence did not differ between sites with ambient versus elevated CO2 concentrations. Dominant males did, however, experience significantly lower rates of pair spawning at elevated CO2 levels. Despite the higher r…
Aptiekas klientu un farmaceitu viedoklis par dekspantenolu saturošu ziežu un krēmu lietošanu
2018
Aptuveni 15% no visiem ģimenes ārstu apmeklējumiem ir saistīti ar sausas ādas problēmām; īpaši ziemas periodā šī problēma saasinās arī Latvijā. Dažiem cilvēkiem sausa āda rada maz izteiktus traucējumus, citiem tā var kļūt par hronisku problēmu, ādas sausuma izraisīta nieze var būtiski pasliktināt pacienta dzīves kvalitāti. Bakalaura darba mērķis: izpētīt dekspentanolu saturošu ziežu un krēmu lietošanas nozīmi ādas veselības uzlabošanā un ādas bojājumu mazināšanā. Bakalaura darba uzdevumi: Apskatīt teorētiskās atziņas par ādu, ādas veselību ietekmējošiem faktoriem un tās bojājumiem, emolientu nozīmi ādas veselības uzlabošanā, dekspentanolu saturošiem krēmiem un ziedēm kā emolientu veidu, kā…
Phase Plane Analysis of Web Drying
2004
The mathematical model which describes the web drying in the papermaking machine has been carried out in the collaboration between our institute and joint-stock company “Paper Mill ‘Ligatne’” engineers. The general principles of this develpopment were underlined in the report [zz00]. Under some simplifying assumptions this model can be reduced to the nonlinear moisture — temperature phase plane equation. This equation promotes to obtain significant physical parameters used in the mathematical model, clarifies the causes which allow to optimize the papermaking machine drying cylinders temperature regime. The phase plane equation also explains the parabolic temperature distribution in a serie…
H∞ fuzzy control of DC-DC converters with input constraint
2012
Published version of an article in the journal: Mathematical Problems in Engineering. Also available from the publisher at: http://dx.doi.org/10.1155/2012/973082 Open access This paper proposes a method for designing H∞ fuzzy control of DC-DC converters under actuator saturation. Because linear control design methods do not take into account the nonlinearity of the system, a T-S fuzzy model and a controller design approach is used. The designed control not only handles the external disturbance but also the saturation of duty cycle. The input constraint is first transformed into a symmetric saturation which is represented by a polytopic model. Stabilization conditions for the H∞ state feedba…
Performance Analysis of Basic Turbo-Roundabouts in Urban Context
2012
AbstractA turbo roundabout is a new type of canalized multilane intersection in which the physical separation between lanes helps to prevent side collisions when crossing the roundabout. This paper presents an estimation of capacity, delays and level of service of basic turbo roundabouts in undersaturation conditions, considering both vehicle flow and pedestrian traffic. The traffic performance model was developed by evaluating the capacity for each entry lane. Owing to the geometric features of the intersection, the total entry capacity is obtained by considering different values of the pedestrian impedance factor and degree of saturation at both the right-turn and left-turn lanes.
GA-based Off-Line Parameter Estimation of the Induction Motor Model Including Magnetic Saturation and Iron Losses
2020
This paper, starting from recent papers in the scientific literature dealing with Rotating Induction Motor (RIM) dynamic modelling, as a first step, improves its space-vector dynamic model, including both the magnetic saturation and iron losses; The main original aspects of the proposed model are the following: 1) the magnetic saturation of the iron core has been described on the basis of both current versus flux and flux versus current functions, 3) it includes the iron losses, separating them in hysteresis and eddy current ones, 4) it includes the effect of the load on the magnetic saturation. Afterwards, it proposes an off-line technique for the estimation of electrical parameters of thi…
Hidden oscillations in stabilization system of flexible launcher with saturating actuators
2013
Abstract In the paper the attitude stabilization system of the unstable flexible launcher with saturating input is considered. It is demonstrated that due to actuator saturation the system performance can significantly degrade. The analytical-numerical method is applied to demonstrate possibility of hidden oscillations and localize their attractor.