Results 81 to 90 of about 1,790,414 (217)

DIFFERENTIATED INFRASTRUCTURAL CITIZENSHIP: Claims‐Making and the Limits to Transformative Urbanization in a Fast‐Growing Small City

International Journal of Urban and Regional Research, EarlyView.
Abstract This article develops the concept of differentiated infrastructural citizenship (DIC) to explain how infrastructural citizenship is materially mediated, socially differentiated, and unevenly exercised in a rapidly urbanizing small city. It advances scholarship on infrastructural citizenship and everyday claims‐making as political participation
Nidhi Subramanyam
wiley   +1 more source

Spectroscopic Quantification of Metallic Element Concentrations in Liquid-Propellant Rocket Exhaust Plumes

Aerospace
Accurate quantification of metallic contaminants in rocket exhaust plumes serves as a critical diagnostic indicator for engine wear monitoring. This paper develops a hybrid method combining atomic emission spectroscopy (AES) theory with a genetic ...
Siyang Tan, Song Yan, Xiang Li, Tong Su, Qingchun Lei, Wei Fan   +5 more
doaj   +1 more source

THE TRANSCALAR POLITICS AND SPATIAL IMPLICATIONS OF INVESTMENTS IN SHOPPING MALLS IN AFRICAN CITIES: A Study of Accra's West Hills Mall, Ghana

International Journal of Urban and Regional Research, EarlyView.
Abstract A surge in the number of shopping malls across many African cities reflects capital's responses to the continent's growing middle class and deepening neoliberal globalization. This article develops an analysis of the transcalar nature of these urban investments using the case of the West Hills Mall (WHM) in the Greater Accra Metropolitan Area (
Rosina Sheburah Essien, George Owusu, Kofi Kekeli Amedzro, Musah Aziba Issah, Jennifer Robinson, John Spyropoulos   +5 more
wiley   +1 more source

One-Dimensional simulation of internal ballistic of a Hybrid Rocket Engine [PDF]

علوم، فناوری و کاربردهای فضایی
A one-dimensional code was developed to simulate the performance of hybrid rocket engines. In this code, the conservation equations of mass, momentum and energy are solved in one-dimensional and inviscid form.
Hadi Rezaei
doaj   +1 more source

The Mysterious Stranger and Modern Enchantment

The British Journal of Sociology, EarlyView.
ABSTRACT Sociological accounts of modernity have long emphasized rationalization, alienation, and the attenuation of affective intensity. While these diagnoses capture crucial dynamics of modern social order, they leave underexplored a persistent and generative dimension of social life: enchantment.
Dmitry Kurakin
wiley   +1 more source

Region‐of‐interest geometry optimization for shooting‐distance estimation from flash‐pulse infrared thermography of gunshot residue on textile targets

Journal of Forensic Sciences, EarlyView.
Abstract Shooting‐distance estimation from gunshot‐residue (GSR) patterns on textiles is affected by substrate properties, residue distribution, and region‐of‐interest (ROI) definition. This study evaluated how ROI geometry influences muzzle‐to‐target distance regression from flash‐pulse infrared thermography of GSR‐related thermal patterns.
Petr Volf, Marek Sokol, Jan Hejda, Martin Valenta, Rudolf Vávra, Lýdie Leová, Patrik Kutílek   +6 more
wiley   +1 more source

Hybrid Rocket Engine Burnback Simulations Using Implicit Geometry Descriptions

Aerospace
The performance of hybrid rocket engines is significantly influenced by the fuel geometry. Burnback simulations, to determine the fuel surface and fluid volume, are therefore an important tool for preliminary design.
Jan Erik Zeriadtke, Joël Martin, Viola Wartemann   +2 more
doaj   +1 more source

Investigation of Dual-Vortical-Flow Hybrid Rocket Engine without Flame Holding Mechanism

International Journal of Aerospace Engineering, 2018
A 250 kgf thrust hybrid rocket engine was designed, tested, and verified in this work. Due to the injection and flow pattern of this engine, this engine was named dual-vortical-flow engine.
A. Lai, T.-H. Chou, S.-S. Wei, J.-W. Lin, J.-S. Wu, Y.-S. Chen   +5 more
doaj   +1 more source

On the Conceptual Overstretch of Weaponized Interdependence in Lithium and Rare‐Earth Element Markets

Global Policy, EarlyView.
ABSTRACT This paper critically examines the conceptual overstretch of weaponized interdependence (WI) in analyses of China's dominance over lithium and rare‐earth element (REE) markets. Although WI has become a central framework for interpreting EU–China economic relations, its application to raw materials often extends beyond the theory's original ...
Lucas Miailhes
wiley   +1 more source

Comparative Thermodynamic and Preliminary Performance Assessment of N₂O, Gaseous O₂, and LOX for a 1 kN Hybrid Rocket Engine

Aerospace
Hybrid rocket engines offer a compromise between safety, controllability, and performance, making them attractive for small-scale propulsion systems. However, oxidizer selection remains a critical early-stage design decision that cannot be determined ...
Sebastian Valencia, Jaime Enrique Orduy, Zahir Rojas   +2 more
doaj   +1 more source