Results 131 to 140 of about 3,445,936 (293)

Numerical analysis of a free piston problem

Mathematical Communications, 2010
The problem considered is the Stokes and Navier-Stokes flow through a system of two pipes in the gravity field; inside a vertical pipe there is a free heavy piston. Theoretical analysis, the existence and non-uniqueness of solution, has been completed recently by the authors.
Muha, Boris, Tutek, Zvonimir
openaire   +2 more sources

Continuous Respiratory Oscillometry in Pediatric Laparoscopic Surgery—The COMET Study

Pediatric Anesthesia, EarlyView.
ABSTRACT Background Laparoscopic appendectomy is the accepted surgical approach for appendicitis in centers worldwide. Laparoscopic surgery requires the creation of a pneumoperitoneum to facilitate surgical access. Laparoscopic surgery affects the respiratory mechanics of patients under general anesthesia.
Neil Hauser, Emanuela Zannin, Julie Nguyen, Anwen Taplin, Sara Vigevani, David Sommerfield, Raffaele Dellaca, R. Nazim Khan, Aine Sommerfield, Britta S. von Ungern‐Sternberg   +9 more
wiley   +1 more source

Simulation study on the operating characteristics of FPEG based on variable load control

Advances in Mechanical Engineering
To stabilize the operation of free-piston engine generators (FPEGs), a variable load control strategy is proposed to regulate piston motion. By dynamically adjusting the equivalent load to control the system’s total resistance, the strategy alters the ...
Yubo Meng, Ping Xu, Zuquan Jiang, Fengxiang Shao, Long Li, Jinliang Zhu   +5 more
doaj   +1 more source

Solids Conveying in Injection Molding Machines—Analytical Model for Smooth and Grooved Feed Sections Derived From DEM Simulations

Polymer Engineering &Science, EarlyView.
Understanding Solids Conveying in Injection Molding Machines – Dimensions. ABSTRACT Solids conveying is a key aspect for the design of polymer processing machines, especially for processes with high screw speeds, grooved feed sections, and material with low bulk density.
Jan Landgraeber, Volker Schoeppner, Dennis Kleinschmidt, Dominik Jonek, Nils Grieger   +4 more
wiley   +1 more source

Interplay Between Dispersion, Nucleation, and Crystallization in HDPE/Graphene Nanocomposites Processed Under Thermokinetic Conditions

Polymer Engineering &Science, EarlyView.
Thermokinetic processing controls graphene fragmentation and dispersion in HDPE, promoting heterogeneous nucleation and multistep crystallization. The balance between nucleation enhancement and chain mobility restriction governs the final crystalline structure and material performance.
Lucas J. S. Nascimento, Tainá dos S. Guatimosim, Fernanda T. G. Dias, Sandro C. Amico, Otávio Bianchi   +4 more
wiley   +1 more source

The free piston linear generator [PDF]

, 2012
The free piston linear generator (FPLG) is a compact electricity generation unit, which is being developed since the year 2003 at the German Aerospace Center (DLR). It is designed as a free-piston combustion engine with integrated linear generator.
Kock, Florian
core  

An Investigation in Poly (Lactic Acid)‐Cellulose Acetate Composites Used for the Controlled Release of Potassium Fertilizers

Polymer Engineering &Science, EarlyView.
Schematic graph of controlled release potassium for plant growth. ABSTRACT Biodegradable polymer–based controlled‐release fertilizers (CRFs) offer an environmentally friendly approach to enhancing nutrient use efficiency while minimizing ecological impacts.
Kaleum Meaney, Ke Gong, Yinshi Lu, Yin Zhu, Lena Madden, Declan Devine, Michael Gaffney, Crevan O'Donnell, Mario Culebras, Maurice N. Collins, Yuanyuan Chen   +10 more
wiley   +1 more source

A Simple Rheology‐Based Framework for Selecting Printing Parameters in Extrusion‐Based Hydrogel Additive Manufacturing

Polymer Engineering &Science, EarlyView.
An open analytical framework converts standard rheological measurements directly into the complete extrusion field and slicer‐ready printing parameters for Piston driven printers, enabling rapid operational window of printability in direct ink writing without CFD or machine learning. ABSTRACT Predicting whether a gel formulation will print successfully
Thiago M. C. Rodrigues, João V. R. C. dos Santos, Nicole P. Martins, Rossana Mara da Silva Moreira Thiré   +3 more
wiley   +1 more source

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

Polymer 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

Design and Development of a Modular Ballistic Pendulum for High‐Impulse Measurement in Contact and Near‐Field Explosive Loading

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT Measuring impulse from explosive charges in contact and near‐field configurations presents practical challenges due to wide variation in impulse magnitude. Ballistic pendula are widely used for impulse measurement, but many existing designs are limited to narrow operating envelopes or are poorly suited to repeated contact testing and tamped ...
R. Alford, R. Hazael, R. Critchley, L. Humphreys   +3 more
wiley   +1 more source