Results 71 to 80 of about 293,641 (360)

Formal [3+2] Cycloaddition Reactions of Electron-Rich Aryl Epoxides with Alkenes under Lewis Acid Catalysis Affording Tetrasubstituted Tetrahydrofurans [PDF]

, 2020
We report on the regio- and stereoselective synthesis of tetrahydrofurans by reaction between epoxides and alkenes in the presence of a Lewis acid. This is an unprecedented formal [3+2] cycloaddition reaction between an epoxide and an alkene.
Cuca-Suárez, Luís, González, Florenci, Macías-Villamizar, Víctor, Rodríguez, Santiago   +3 more
core   +1 more source

A Case‐Based Reasoning Approach to Model Manufacturing Constraints for Impact Extrusion

Advanced Engineering Materials, EarlyView.
A hybrid modeling approach is presented that combines constraint‐based process modeling and case‐based reasoning. The model formalizes manufacturing constraints and integrates simulation data to model complex manufacturing processes. The approach supports manufacturability analysis during product design through an adaptive modeling environment.
Kevin Herrmann, Eduard Ortlieb, Hendrik Wester, Paul Christoph Gembarski, Bernd‐Arno Behrens, Roland Lachmayer   +5 more
wiley   +1 more source

Desidrogenação do etilbenzeno sobre compostos de ferro e alumínio

Química Nova, 2003
Chromium and potassium-doped iron oxides are widely used as industrial catalysts in the dehydrogenation of ethylbenzene to produce styrene. They have several advantages but deactivate with time, because of the loss of potassium.
Oliveira Alcinéia Conceição, Rangel Maria do Carmo   +1 more
doaj  

Experimental Study on Laser Lap Welding of Aluminum–Steel with Pre-Fabricated Copper–Nickel Binary Coating

Crystals
In order to solve the problem of poor weld quality caused by brittle metal compounds in the welding of dissimilar metals between aluminum and steel, a pre-welding treatment method of prefabricated copper–nickel binary coating between aluminum and steel ...
Hua Zhang, Huiyan Gu, Dong Ma
doaj   +1 more source

Assessing the Ecological Value: Monetizing Process Innovations in Tailored Forming

Advanced Engineering Materials, EarlyView.
This article introduces a method for evaluating the sustainability of innovations, even with limited data. The method is illustrated through an analysis of the “Tailored Forming” technology, which explores the impact of sustainability on economic value added.
Jonas Schneider, Jan Westing, Matthias Schmidt, Peter Nyhuis, Vivian Katharina Kuprat   +4 more
wiley   +1 more source

Compound Formation and Microstructure of As-Cast High Entropy Aluminums [PDF]

Metals, 2018
The aim of this work is to study the microstructure of four high entropy alloys (HEAs) produced by large scale vacuum die casting. Al40Cu15Mn5Ni5Si20Zn15, Al45Cu15Mn5Fe5Si5Ti5Zn20, Al35Cu5Fe5Mn5Si30V10Zr10, and Al50Ca5Cu5Ni10Si20Ti10 alloys formed a mixture of different structures, containing intermetallic compound (IC) and solid solution (SS) phases ...
Jon Sanchez, Iban Vicario, Joseba Albizuri, Teresa Guraya, Natalia Koval, Jose Garcia   +5 more
openaire   +6 more sources

IR ion spectroscopy in a combined approach with MS/MS and IM-MS to discriminate epimeric anthocyanin glycosides (cyanidin 3-O-glucoside and -galactoside) [PDF]

, 2019
Anthocyanins are widespread in plants and flowers, being responsible for their different colouring. Two representative members of this family have been selected, cyanidin 3-O-β-glucopyranoside and 3-O-β-galactopyranoside, and probed by mass spectrometry ...
Botta, B., Cesa, S., Chiavarino, B., Corinti, D., Crestoni, M. E., Fornarini, S., Ingallina, C., Maccelli, A., Mannina, L., Quaglio, D., Tintaru, A.   +10 more
core   +2 more sources

Mechanisms of Increasing Weld Depth during Temporal Power Modulation in High‐Power Laser Beam Welding

Advanced Engineering Materials, EarlyView.
Temporal power modulation increases weld depth in high‐power laser beam welding of dissimilar round bars by nearly 20% compared to same average continuously welded welding power. The mechanism of action also applies to sheet welding and depends on the inertia of keyhole depth for the modulated laser beam power.
Jan Grajczak, David Reynders, Christian Nowroth, Jens Twiefel, Jörg Wallaschek, Sarah Nothdurft, Jörg Hermsdorf, Stefan Kaierle   +7 more
wiley   +1 more source

DEVELOPMENT OF CASTING TECHNOLOGIES DURING FORMATION OF PROPERTIES OF ALUMINUM-BASED MATERIALS WITH CARBON OF DIFFERENT STRUCTURAL CONDITION

Литьë и металлургия, 2015
The paper gives an assessment of existing casting methods used for manufacturing products from aluminum materials with carbon filling compounds. It presents results of comparative studies of properties of aluminum materials in which microcrystalline ...
A. T. Volochko
doaj  

Effect of Boron-Zinc-Aluminum-Silicium Compounds on the Fire Performance of Ultra-Low Density Fiberboards (ULDFs)

BioResources, 2016
B-Zn-Si-Al compounds, as a modification of Si-Al compounds, is made of sodium silicate, zinc sulfate, borax and aluminum sulfate, acting as a fire retardant during the preparation of ultra-low density fiberboards (ULDFs).
Zhenzeng Wu, Tingjie Chen, Min Niu, Yongqun Xie, Xiaodong (Alice) Wang   +4 more
doaj   +1 more source