Results 61 to 70 of about 323,219 (285)

Optimization of Experimental Conditions for Biodiesel Production [PDF]

open access: yes, 2012
This study is based on optimizing the experimental conditions of biodiesel production by base-catalyzed transesterification using waste cooking oil (WCO). In this study, the key parameters varied were methanol (20, 25, 30, 35, and 40%), sodium hydroxide (
Ayoola, A. A.   +3 more
core  

InP nanocrystals on silicon for optoelectronic applications

open access: yes, 2012
One of the solutions enabling performance progress, which can overcome the downsizing limit in silicon technology, is the integration of different functional optoelectronic devices within a single chip. Silicon with its indirect band gap has poor optical
Helm, Manfred   +10 more
core   +1 more source

Can Ti‐Based MXenes Serve as Solid Lubricants for Brake Applications? A Tribological Study

open access: yesAdvanced Engineering Materials, EarlyView.
This study explores the first implementation of Ti‐based MXenes materials in brake pad friction composite material. The resulting composite material exhibits a 48% reduction in the wear rate; alongside significant improvements are observed for thermal and mechanical properties.
Eslam Mahmoud   +7 more
wiley   +1 more source

On the very long term evolutionary behavior of hydrogen-accreting Low-Mass CO white dwarfs [PDF]

open access: yes, 1999
Hydrogen-rich matter has been added to a CO white dwarf of initial mass 0.516 \msun at the rates $10^{-8}$ and $2\times 10^{-8}$ \msun \yrm1, and results are compared with those for a white dwarf of the same initial mass which accretes pure helium at the
Amedeo Tornambé   +4 more
core   +3 more sources

Influence of Sample Preparation and Processing Procedures on the Thermal Diffusivity of MgO‐C Refractories

open access: yesAdvanced Engineering Materials, EarlyView.
The thermal diffusivity of MgO‐C refractories is highly sensitive to sample preparation and processing procedures. In this article, the effects of coking sequence, machining conditions, structural inhomogeneity, and graphite coating application on measurements using laser flash apparatus are systematically investigated.
Luyao Pan   +4 more
wiley   +1 more source

FLASH EVAPORATION ENHANCEMENT BY ELECTROLYSIS OF SATURATED WATER FLOWING UPWARDS IN VERTICAL PIPE

open access: yesJournal of Engineering, 2010
An experimental system was designed and built to produce the flash evaporation of upward water flow in a (1.8 m) vertical mounted glass test section pipe.
Akram. W. Izzat, Radwan Muhammad Addaiy
doaj   +1 more source

Bandgap narrowing in Mn doped GaAs probed by room-temperature photoluminescence

open access: yes, 2015
The electronic band structure of the (Ga,Mn)As system has been one of the most intriguing problems in solid state physics over the past two decades.
Gao, K.   +13 more
core   +1 more source

Thermoelectric Modules Incorporating MgAgSb and Mg3(Sb,Bi)2 Synthesized Using a Melting Method

open access: yesAdvanced Engineering Materials, EarlyView.
A scalable synthesis method for a thermoelectric material of MgAgSb is established. A thermoelectric power module of MgAgSb/Mg3(Sb,Bi)2 is fabricated, showing the conversion efficiency of 7.4% at ΔT = 315 K. The performance is comparable to conventional Bi2Te3 modules when they are operated with an air‐cooled heat exchanger.
Kazuo Nagase   +8 more
wiley   +1 more source

X-Ray Flashes in Recurrent Novae: M31N 2008-12a and the Implications of the Swift Non-detection

open access: yes, 2016
Models of nova outbursts suggest that an X-ray flash should occur just after hydrogen ignition. However, this X-ray flash has never been observationally confirmed.
Bode, Michael F.   +12 more
core   +1 more source

On Carbon Burning in Super Asymptotic Giant Branch Stars [PDF]

open access: yes, 2015
We explore the detailed and broad properties of carbon burning in Super Asymptotic Giant Branch (SAGB) stars with 2755 MESA stellar evolution models.
Farmer, R., Fields, C. E., Timmes, F. X.
core   +2 more sources

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