Results 151 to 160 of about 107,395 (302)

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

open access: yesLimnology and Oceanography: Methods, EarlyView.
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

SPIKE-2: a Practical Stirling Engine for Kilowatt Level Solar Power [PDF]

open access: yes
Recent advances in the art of free piston Stirling engine design make possible the production of 1-10kW free piston Stirling linear alternator engine, hermetically sealed, efficient, durable and simple in construction and operation.
Beale, W. T.
core   +1 more source

Convergence of Organ‐on‐a‐Chip and Freeform Printing of Sacrificial Poly(2‐cyclopropyl‐2‐oxazoline) Enables the Generation of Perfusable Endothelialized Channels in Hydrogels

open access: yesMacromolecular Rapid Communications, EarlyView.
We employ freeform printing of thermo‐responsive poly(2‐oxazoline) to directly fabricate suspended sacrificial vascular templates within Organ‐on‐a‐chip devices. This enables circular, perfusable channels down to 200 µm without post‐processing.
Giulia Maria Di Gravina   +7 more
wiley   +1 more source

Free-piston Stirling technology for space power [PDF]

open access: yes
An overview is presented of the NASA Lewis Research Center free-piston Stirling engine activities directed toward space power. This work is being carried out under NASA's new Civil Space Technology Initiative (CSTI).
Slaby, Jack G.
core   +1 more source

Finite‐Time Disturbance Observer‐Based Nonlinear Robust Adaptive Control of Hydraulic Manipulator With Parameter Identification

open access: yesInternational Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Hydraulic manipulators exhibit strong coupling, pronounced nonlinearities, and significant modeling uncertainties, which hinder high‐precision motion control. This paper proposes a finite‐time disturbance observer–based nonlinear robust adaptive control (RAC‐FTDO) framework enhanced by a physically consistent dynamic parameter identification ...
Tianyu Gao   +3 more
wiley   +1 more source

Material Development and Foam Extrusion Processing of Thermoplastic Starch‐Based Compounds

open access: yesPolymer Engineering &Science, EarlyView.
Schematic representation of the project: a compound material based on thermoplastic starch and PBAT is developed for further processing in the foam extrusion process to achieve a flexible foam sheet with a low density and fine‐pored foam structure. ABSTRACT An investigation into the properties of starch‐based compounds is conducted to determine their ...
Tien Viet Anh Vu   +4 more
wiley   +1 more source

Characteristics, properties and limitations of per‐ or polyfluoroalkyl substances (PFASs) and fluoropolymers

open access: yesPolymer International, EarlyView.
An overview and categorization of man‐made per‐ or polyfluoroalkyl substances (PFASs) including low‐molar‐mass and high‐molar‐mass fluorochemicals, and their international regulations is presented. Though certain PFASs are toxic, bioaccumulative and cross the human cellular membranes, others, such as fluoropolymers, are safe, reliable and involved in ...
Bruno Améduri
wiley   +1 more source

Model free piston Stirling engine

open access: yesThe Proceedings of the Symposium on Stirlling Cycle, 2003
Shoichi YOSHIHARA, Takeshi HOSHINO
openaire   +2 more sources

RE-1000 free-piston Stirling engine hydraulic output system description [PDF]

open access: yes
The NASA Lewis Research Center was involved in free-piston Stirling engine research since 1976. Most of the work performed in-house was related to characterization of the RE-1000 engine.
Geng, Steven M., Schreiber, Jeffrey G.
core   +1 more source

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