Results 11 to 20 of about 1,674,359 (231)

Seed-assisted H-[B]-ZSM-5 borosilicate: Investigating the effect of promoter level on catalytic production of propylene from methanol

open access: yesCatalysis Communications, 2023
Boron was implemented to promote the catalytic behavior of H-ZSM-5 zeolite in methanol to propylene (MTP) process. A series of crystalline borosilicates with different boron contents were synthesized using a seed-assisted hydrothermal technique and ...
Hossein Roohollahi   +3 more
doaj   +1 more source

DISPERSION IN A TWO-PHASE FLOW SULZER COLUMN

open access: yesStudia Universitatis Babes-Bolyai Chemia, 2023
An experimental study based on the pulse-response technique was performed in a Sulzer packed-bed column in order to establish the residence time distribution for four different liquid flow rates, namely 200, 400, 600 and 800 L/h and five different gas ...
Eugenia Teodora IACOB TUDOSE
doaj   +1 more source

The effect of aging processes on tribo-metallurgy properties of al based ternary alloys product by P/M technique [PDF]

open access: yesScience of Sintering, 2020
In this study, Al matrix composites consisting of different amounts of Zn, Cu, and Mg were produced using the powder metallurgy technique. In the alloying, powders were ball milled for 120 min via mechanical alloying. After alloying process, the
Kaplan Yavuz   +4 more
doaj   +1 more source

Spectrophotometric Determination of Amoxicillin Using New Organic Reagent via Different Analytical Methods

open access: yesIndonesian Journal of Chemistry, 2023
New and simple spectrophotometric method was applied for amoxicillin determination by oxidative coupling with an organic reagent 1-(4-aminophenyl)-3-(5-(4-nitrophenyl)-furan-2-yl)-yl)-prop-2-en-1-one (H) to form an orange colored dye with λmax of 490 nm.
Helen Abd Alhassan Mahmood   +2 more
doaj   +1 more source

Efficient finite element numerical solution of the variable coefficient fractional subdiffusion equation

open access: yesAdvances in Difference Equations, 2019
Based on the weighted and shifted Grünwald formula, a fully discrete finite element scheme is derived for the variable coefficient time-fractional subdiffusion equation.
Lin He, Juncheng Lv
doaj   +1 more source

Comparison of Metabolic Rates of Young of the Year Beluga (Huso huso), Sterlet (Acipenser ruthenus) and Bester Hybrid Reared in a Recirculating Aquaculture System

open access: yesFishes, 2021
In the present study, oxygen consumption of two sturgeon species, beluga (Huso huso), sterlet (Acipenser ruthenus), and their hybrid reared in a recirculating aquaculture system were compared over body intervals from 54–107 g to determine the ...
Mirela Crețu   +3 more
doaj   +1 more source

Wiener-Hopf solution for impenetrable wedges at skew incidence [PDF]

open access: yes, 2006
A new Wiener-Hopf approach for the solution of impenetrable wedges at skew incidence is presented. Mathematical aspects are described in a unified and consistent theory for angular region problems.
Lombardi, Guido, V.G, Daniele
core   +1 more source

Research on Friction and Wear Performance of TiB2 Based Self-lubricating Ceramic composites

open access: yesMATEC Web of Conferences, 2017
TiB2 based self-lubricating ceramic composites with the addition of different content of h-BN were prepared by hot pressing technique and their mechanical properties were tested.
Ding Huagang
doaj   +1 more source

2D Gain Enhancement Based on Single-Layer SIW Corrugated Technique with Slot Array Feeder

open access: yesInternational Journal of Antennas and Propagation, 2018
Novel slot-array-based SIW corrugated technique is demonstrated to achieve 2D gain enhancement, namely, sharpening the beamwidths in both E-plane and H-plane.
Mingtuan Lin, Chenglong Lin
doaj   +1 more source

Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging

open access: yesJournal of Imaging, 2023
This work reports on a terahertz tomography technique using constant velocity flying spot scanning as illumination. This technique is essentially based on the combination of a hyperspectral thermoconverter and an infrared camera used as a sensor, a ...
Abderezak Aouali   +3 more
doaj   +1 more source

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