Results 121 to 130 of about 753,354 (337)

A origem da salinidade no Continente Antártico The origin of salinity in the Antarctic Continent

Revista de Ciências Agrárias, 2010
A Antártica é o mais perfeito laboratório natural do planeta para estudos de mudanças ambientais. Partindo dessa premissa, este estudo teve como objetivo realizar uma revisão sobre a origem dos sais presentes no continente antártico, sendo pormenorizado ...
Arcângelo Loss, Celeste Queiroz Rossi, Marcio Rocha Francelino   +2 more
doaj  

Analyzing the Thermal Behavior and Phase Transitions of ZnSnO₃ Prepared via Chemical Precipitation

Engineering Proceedings
ZnSnO3 ceramics were prepared via chemical precipitation at various calcination temperatures of 200, 300, 400, 500, and 600 °C. The prepared ceramics were analyzed using thermogravimetric analysis–differential scanning calorimetry (TGA–DSC), X-ray ...
Ragupathi Indhumathi, Arumugasamy Sathiya Priya, Baskar Sumathi Samyuktha   +2 more
doaj   +1 more source

One-pot synthesis of zinc oxide nanoparticles via chemical precipitation for bromophenol blue adsorption and the antifungal activity against filamentous fungi. [PDF]

Sci Rep, 2021
Akpomie KG, Ghosh S, Gryzenhout M, Conradie J.   +3 more
europepmc   +1 more source

Elinvar Materials: Recent Progress and Challenges

Advanced Engineering Materials, EarlyView.
Elinvar materials, exhibiting temperature‐invariant elastic modulus, are critical for precision instruments and emerging technologies. This article reviews recent progress in the field, with a focus on the anomalous thermoelastic behavior observed in key material systems.
Wenjie Li, Yang Ren
wiley   +1 more source

A comparative study of hydroxyapatite nanoparticles synthesized by different routes

Química Nova, 2012
In this study, bioactive hydroxyapatite nanoparticles were prepared by two different methods: wet chemical precipitation and biomimetic precipitation. The aim was to evaluate the morphology, particle-size, crystallinity and phases of the powders obtained
Adrian Paz, Dainelys Guadarrama, Mónica López, Jesús E. González, Nayrim Brizuela, Javier Aragón   +5 more
doaj   +1 more source

Titan's lakes chemical composition: sources of uncertainties and variability

, 2011
Between 2004 and 2007 the instruments of the CASSINI spacecraft discovered hydrocarbon lakes in the polar regions of Titan. We have developed a lake-atmosphere equilibrium model allowing the determination of the chemical composition of these liquid areas.
A.G.M. Ferreira, Aharonson, Brown, Carruth, Cordier, Crespin, D. Cordier, Dubouloz, Dymond, Edejer, Flasar, Fulchignoni, Giauque, Hayes, Hildebrand, Hébrard, J.I. Lunine, Jennings, L.Q. Lobo, Landau, Lavvas, Lavvas, Lebonnois, Lorenz, Lorenz, Lunine, Majer, McKay, Metropolis, Muhleman, Niemann, O. Mousis, P. Lavvas, P. Rannou, Poling, S. Lebonnois, Somayajulu, Stiles, Stofan, Tegeler, Tokano, Tokano, Turtle, Vuitton, Wall   +44 more
core   +4 more sources

Laser Metal Deposition of Aluminum Alloys 7075 and 5083 with the Addition of Volatile Alloying Elements through Powder Blending

Advanced Engineering Materials, EarlyView.
This study investigates laser metal deposition of aluminum alloys EN AW‐7075 and EN AW‐5083, using powder blending to compensate zinc and magnesium evaporation. In situ alloying and ex situ alloying with ZnAl12 and AZ91 preserve near‐standard compositions and improve mechanical properties.
Finn Bendixen, Anastasiya Toenjes, Annika Bohlen, Thomas Seefeld   +3 more
wiley   +1 more source

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons [PDF]

, 2020
María Agustina Guitar, U.P. Nayak, Dominik Britz, Frank Mücklich   +3 more
openalex   +1 more source

Chemical evolution of the early Martian hydrosphere [PDF]

The chemical evolution of the early Martian hydrosphere is discussed. The early Martian ocean can be modeled as a body of relatively pure water in equilibrium with a dense carbon dioxide atmosphere. The chemical weathering of lavas, pyroclastic deposits,
Schaefer, M. W.
core   +1 more source

Kecerdasan emosi dalam kalangan pelajar Diploma Pendidikan Lepasan Ijazah (DPLI) Universiti Tun Hussein Onn Malaysia [PDF]

, 2013
Kecerdasan emosi dapat dijadikan sebagai panduan bagi mewujudkan pendidikan yang berkualiti serta sebagai asas pemerolehan ilmu pengetahuan bagi seseorang pendidik dalam menjalankan tugasnya sebagai seorang guru.
Che Ani, Rashida
core