Results 121 to 130 of about 16,235 (210)

Highly Versatile Hydrogenative Functionalizations of Phthalimides Catalyzed by an Ag‐Alumina Zeolite Nanocomposite: One‐Pot Synthesis of 3‐Substituted Isoindolinones

open access: yesAdvanced Synthesis &Catalysis, Volume 368, Issue 9, 5 May 2026.
Heterogeneous‐catalyzed selective and versatile hydrogenative functionalizations of phthalimides have been developed for the first time. By using a solid nanocomposite formed by [Ag/Al2O3] material in combination with [H‐BETA] zeolite as cocatalyst, a broad range of 3‐functionalized isoindolinones have been accesed in one‐pot from phthalimides, H2 and ...
Carles Lluna‐Galán   +2 more
wiley   +1 more source

Design and optimization of processes for recovering rare earth elements from end‐of‐life permanent magnets

open access: yesAIChE Journal, Volume 72, Issue 5, May 2026.
Abstract Recovery of rare earth elements (REEs) from end‐of‐life (EOL) products represents a strategic opportunity to strengthen the domestic supply chain for rare earth elements. This work presents a superstructure‐based optimization framework for finding the most economical processing pathway for different EOL rare earth permanent magnets (REPMs ...
Chris Laliwala   +6 more
wiley   +1 more source

Synthesis of Hydrocarbon Fuels From Dimethyl Ether Through Co‐Oligomerization of Olefins

open access: yesChemie Ingenieur Technik, Volume 98, Issue 5, Page 262-270, May 2026.
This work investigates the impact of higher olefins and typical impurities from a preceding Dimethyl ether‐to‐Olefins (DtO) process on olefin oligomerization for sustainable fuel production. Several key properties of the kerosene fraction comply with the ASTM D7566 22a standard for sustainable aviation fuels, whereas some important properties of the ...
Marc Pfennings   +5 more
wiley   +1 more source

Mask breathing system for the Apollo command module [PDF]

open access: yes
Breathing mask for Apollo command module ...
Price, D. F., Tanner, R. N.
core   +1 more source

Baseline design of the filters for the LAD detector on board LOFT

open access: yes, 2014
The Large Observatory for X-ray Timing (LOFT) was one of the M3 missions selected for the phase A study in the ESA's Cosmic Vision program. LOFT is designed to perform high-time-resolution X-ray observations of black holes and neutron stars.
Barbera, M.   +6 more
core   +1 more source

Synergistic Enhancement of Modified‐PVDF Humidity Sensitivity via Chemical Adsorption‐Ionic Conductivity and its Application in Intelligent Powered Air‐Purifying Respirator

open access: yesENERGY &ENVIRONMENTAL MATERIALS, Volume 9, Issue 3, May 2026.
The study developed a PVDF/SiO2 humidity sensor with superhydrophobic properties and integrated the humidity sensor into the intelligent powered air‐purifying respirator (IPAPR) for breath monitoring. Coupled with the Gated Recurrent Unit (GRU) machine learning prediction algorithm, it enables feedforward control of the fan to achieve respiratory ...
Xinjian He   +9 more
wiley   +1 more source

An ultraviolet–visible spectroscopy system for studying real‐time pressure effects on enzyme activity

open access: yesLimnology and Oceanography: Methods, Volume 24, Issue 5, May 2026.
Abstract Investigations of hydrostatic pressure effects on microbial enzymatic processing are challenging but critical for understanding element cycling in the world's oceans. In this study, we developed and tested a stainless‐steel pressure cell capable of withstanding up to 110 MPa of hydrostatic pressure (equivalent to ~ 11,000 m depth), featuring ...
Maria Papadimitraki   +6 more
wiley   +1 more source

Polyhydroxyalkanoates as Sustainable Agricultural Plastics: Processing Strategies, Performance, and Environmental Perspectives

open access: yesMacromolecular Materials and Engineering, Volume 311, Issue 5, May 2026.
This review highlights polyhydroxyalkanoates (PHAs) as biodegradable materials for agricultural plastics. It outlines how composition, processing, and formulation strategies shape material properties and end‐of‐life behavior. Applications in films and foams are discussed alongside current limitations in cost and scalability, emphasizing emerging ...
Giulia de Simão de Sousa   +4 more
wiley   +1 more source

Technical report analysis and design: Study of solid rocket motors for a space shuttle booster, volume 2, book 1, supplement 1 [PDF]

open access: yes
An analysis and design effort was conducted as part of the study of solid rocket motor for a space shuttle booster. The 156-inch-diameter, parallel burn solid rocket motor was selected as its baseline because it is transportable and is the most cost ...

core   +1 more source

Hydraulic calipers [PDF]

open access: yes, 1969
Hydraulic calipers determine area of annular openings in irregular or concealed passages. With modifications the device could be adapted to investigations of cross-sectional changes in heat flow passages, ducts, conduits, and heat exchanger ...
Benson, J. A.
core   +1 more source

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