Search results for "Drag"
showing 10 items of 179 documents
Dracocephalum ruyschiana L. (Svētezers, Livlande)
2020
Nordischer Drachenkopf. Karl Reinhold Kupffer Anmerkung: Von Herr Raudsep erhalten als bei Heiligensee in Livland gesamellt. Ende des 19., Anfang des 20. Jahrhunderts. /// Ruiša pūķgalve. Uzraksts: no Raudsepa kunga saņemts kā pie Svētezera Livlandē ievākts. 19.gadsimta beigas, 20. gadsimta sākums. /// Northern Dragon-head. Annotation: received from Mr. Raudsepp as collected at Svētezers in Livland.Late 19th century, early 20th century. [Attēls no LU Muzeja kolekcijas Herbarium Balticum (RIG I); (BOT2791_5).]
Dracocephalum ruyschiana L. (Ogres Kangari)
1977
Ruiša pūķgalve, atradne: Ogres rajonā, Ogres Kangaros, granstkarjera A galā priežu meža klajumiņā dienvidrietumu nogāzē, kopā ar Onobrychis, Geranium sanguineum, Filipendula hexapetala, Trifolium montanum (esparsete, asinssarkanā gandrene, lielziedu vīgrieze, kalnu āboliņš). /// Northern Dragon-head, deposit: In Ogre district, Ogres Kangaros, at the eastern end of the gravel quarry in the pine forest clearing on the south-west side, together with Onobrychis, Geranium sanguineum, Filipendula hexapetala, Trifolium montanum. [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1029_7)]
Dracocephalum ruyschiana L. (Silciems)
1979
Atradne: Rīgas rajona Silciemā, Allažu mežniecības 14. kvartālā, Silciema-Mežmuižas ceļa kreisajā pusē. Zilā un rozā forma. /// Riga district Silciem, 14 th quarter of the Forestry of Allazi, on the left side of the Silciem-Mezmuiza Road. Blue and pink shapes. // [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1029_1)]
Dracocephalum ruyschiana L. (Ļaudona)
1979
Ruiša pūķgalve, atradne: Madonas rajona Ļaudona, 2 km uz dienvidiem priežu mētrājā, stāvas nogāzes augšējā daļā. /// Northern Dragon-head, deposit: Laudon in Madona district, 2 km south in the pine moorland, in the upper part of the steep slope. /// [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1029_8)]
CFD Simulation of Particle Distribution in Stirred Vessels
2000
In this work the particle concentration distribution in two-phase stirred tanks is simulated on the basis of information on the three-dimensional flow field, as obtained by numerical solution of the flow equations (CFD) using the well known k –ɛ « turbulence model. Two modelling approaches are attempted. In the simpler method the flow field is first simulated neglecting the influence of the solid phase; on the basis of the resulting flow field a very simple sedimentation model is employed for solving the solids mass balance equations in order to compute the particle concentration field. In this case no inertial effects on the solid particles are considered, so that the convective and diffus…
Particle drag coefficients in turbulent fluids
1998
Abstract An accurate estimation of particle settling velocities, and/or of particle drag coefficients, is required for modelling purposes in many industrially important multiphase processes involving the suspension of millimetre and sub-millimetre size particles in a liquid phase. It is known that the settling velocity of particles in a turbulent fluid may be significantly different from that in the still fluid, depending on turbulence and particle characteristics. Despite the wide range of processes that would benefit from a thorough understanding of this phenomenon, experimental data and reliable correlations are still lacking in the scientific literature, especially for the case of the a…
Influence of the quadratic term in the alongwind stochastic response of SDOF structures
1996
A parametric study, regarding the influence of the quadratic pressure term, which is often neglected in the literature, on the stochastic alongwind response of a single-degree-of-freedom (SDOF) structure subjected to wind action, is presented. The results are reported in terms of percentages of difference in the evaluation of the response, by considering and neglecting the quadratic pressure term. The changing parameters considered are: the terrain drag coefficient, the structure height, the structure natural radian frequency, the structure damping coefficient and the wind reference mean velocity. The response stochastic analysis has been carried out in the time domain, by means of the mome…
Determination of hydrodynamic drag forces and drag coefficients on human leg/foot model during knee exercise.
2000
Objective. The purpose of this laboratory experiment was to measure hydrodynamic drag forces in barefoot/hydro-boot conditions and accordingly, to determine the coefficients of drag on human leg/foot model during simulated knee extension–flexion exercise. Design. The prosthesis of the human lower leg was set in a water tank and connected into an isokinetic force dynamometer to measure resistive forces during knee motion. Background. Quantifying resistance for aquatic exercises has been a challenge in hydrotherapy. The use of models of foot/leg provides a practical method to calculate coefficients of drag and to estimate resistance for rehabilitation purposes in musculoskeletal and amputee p…
Impact of Noah-LSM Parameterizations on WRF Mesoscale Simulations: Case Study of Prevailing Summer Atmospheric Conditions over a Typical Semi-Arid Re…
2021
The current study evaluates the ability of the Weather Research and Forecasting Model (WRF) to forecast surface energy fluxes over a region in Eastern Spain. Focusing on the sensitivity of the model to Land Surface Model (LSM) parameterizations, we compare the simulations provided by the original Noah LSM and the Noah LSM with multiple physics options (Noah-MP). Furthermore, we assess the WRF sensitivity to different Noah-MP physics schemes, namely the calculation of canopy stomatal resistance (OPT_CRS), the soil moisture factor for stomatal resistance (OPT_BTR), and the surface layer drag coefficient (OPT_SFC). It has been found that these physics options strongly affect the energy partiti…
Natural resins: chemical constituents and medicinal uses
2011
Plants and their exudates are used worldwide for the treatment of several diseases and novel drugs continue to be developed through phytochemical research. There are more than 20,000 species of high vegetables, used in traditional medicines that are sources of potential new drugs. Following the modern medicine and drug research advancing, chemically synthesized drugs have replaced plants as the source of most medicinal agents in industrialized countries. However, in developing countries, the majority of the world’s population cannot afford pharmaceutical drugs and use their own plant based indigenous medicines. Several exudates from plants are well-known in folk medicine since ancient time,…