Results 31 to 40 of about 82,410 (303)

Preanalytical nonconformity management regarding primary tube mixing in Brazil [PDF]

Journal of Medical Biochemistry, 2017
Background: The multifaceted clinical laboratory process is divided in three essential phases: the preanalytical, analytical and postanalytical phase. Problems emerging from the preanalytical phase are responsible for more than 60% of laboratory errors ...
Lima-Oliveira Gabriel, Guidi Gian Cesare, Pacifici Guimaraes Andre Valpassos, Abol Correa Jose, Lippi Giuseppe   +4 more
doaj  

Kink oscillations of flowing threads in solar prominences [PDF]

, 2011
Recent observations by Hinode/SOT show that MHD waves and mass flows are simultaneously present in the fine structure of solar prominences. We investigate standing kink magnetohydrodynamic (MHD) waves in flowing prominence threads from a theoretical ...
Ahn, Andries, Andries, Andries, Arregui, Ballester, Berger, Cao, Carbonell, Chae, Chae, De Pontieu, Dymova, Díaz, Díaz, Díaz, Edwin, Erdélyi, Goossens, Jess, Joarder, Joarder, Kucera, Lin, Lin, M. Goossens, Morton, Morton, Morton, Nakariakov, Ning, Ofman, Okamoto, Oliver, Oliver, R. Soler, Schmieder, Soler, Soler, Soler, Terra-Homem, Terradas, Terradas, Terradas, Terradas, Tomczyk, Tomczyk, Torrence, Van Doorsselaere, Verth, Wang, Wang, Zirker   +52 more
core   +1 more source

CFD simulation of a hyperloop capsule inside a closed environment

Results in Engineering, 2021
One of the most restrictive conditions in ground transportation is traveling through a tunnel at high speed. In those conditions waves are propagated, increasing the pressure upstream the object, and so, the drag compared to the open flow case.
Federico Lluesma-Rodríguez, Temoatzin González, Sergio Hoyas   +2 more
doaj   +1 more source

A Physical Limit to the Magnetic Fields of T Tauri Stars [PDF]

, 1998
Recent estimates of magnetic field strengths in T Tauri stars yield values $B=1$--$4\,{\rm kG}$. In this paper, I present an upper limit to the photospheric values of $B$ by computing the equipartition values for different surface gravities and effective
Biermann L., Bouvier J., Donati J.-F., Guenther E. W., Johnstone R. M., Johnstone R. M., Kuker M., Landolfi M., Pedro N. Safier   +8 more
core   +3 more sources

Design and Analysis of Guidance Function of Permanent Magnet Electrodynamic Suspension

Technologies, 2022
Inspired by the guidance principle in the electromagnetic levitation system, a new permanent magnet electrodynamic suspension (PM EDS) structure with ferromagnetic guidance track is proposed and analyzed in this paper.
Yuqing Xiang, Zigang Deng, Hongfu Shi, Kaiwen Li, Ting Cao, Bin Deng, Le Liang, Jun Zheng   +7 more
doaj   +1 more source

Performance enhancement of an evacuated tubes solar collector using Forchheimer’s saturated porous media with embedded nanofluid

Advances in Mechanical Engineering, 2022
The evacuated tube solar collector is a proper choice for converting solar energy into heat since it is efficient, practical, and cost-effective. In the current study, the role of nanofluid in porous medium was numerically investigated to improve the ...
Hamzeh M Duwairi, Mohammad Alrbai, Mohammad B Al-Dweik   +2 more
doaj   +1 more source

Novel high precision low-cost dual axis sun tracker based on three light sensors

Heliyon, 2022
This study aims to test a new type of dual axes solar tracker based on just three Light Dependent Resistors (LDR) as optical sensors in order to achieve a high precision sun tracking that satisfies the requirements of solar concentration systems.
Youssef Boukdir, Hamid EL Omari
doaj   +1 more source

Method of purifying metallurgical grade silicon employing reduced pressure atmospheric control [PDF]

, 1979
A method in which a quartz tube is charged with chunks of metallurgical grade silicon and/or a mixture of such chunks and high purity quartz sand, and impurities from a class including aluminum, boron, as well as certain transition metals including ...
Chaney, R. E., Ingle, W. M., Thompson, S. W.   +2 more
core   +1 more source

Removing Oxide Layers and Retaining Oxide‐Free Steel Surfaces by Polishing in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this study, the efficacy of wet mechanical polishing under an oxygen‐free atmosphere for deoxidation and the retention of an oxide‐free steel surface are elucidated using X‐ray photoelectron spectroscopy. The methodology proved successful; however, the results were highly dependent on the preparation of the solvents used to clean the samples after ...
Friedrich Bürger, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +2 more
wiley   +1 more source

Investigation of the Hottel–Whillier–Bliss Model Applied for an Evacuated Tube Solar Collector

Eng
The goal of this research is to examine the applicability of the Hottel–Whillier–Bliss model, developed for flat-plate collectors, to evacuated tube solar collectors.
Márton Rátkai, Gábor Géczi, László Székely   +2 more
doaj   +1 more source