Results 111 to 120 of about 57,287 (288)

The Critical Role of Economies of Scale: A Techno‐Economic Assessment of Small‐ Versus Large‐Scale Biogas Upgrading in Rural Tanzania

Energy Science &Engineering, EarlyView.
Small‐scale biogas upgrading can improve methane quality but remains financially unattractive to individual rural households. Community‐scale implementation substantially lowers energy costs, demonstrating that economies of scale are critical to making purified biogas a viable clean‐cooking option in Tanzania.
Emmanuel Nsekela, Louis Macours, Kenneth Dries, Wim Deferme, Nyangi Chacha, Allard C.R. van Riel   +5 more
wiley   +1 more source

A Cross‐Species Hormone Knowledge Base With Multi‐Dimensional Data Integration and Intelligent Query Assistance

iMetaMed, EarlyView.
AHormoneDB is a no‐code platform that combines DOID‐standardized hormone–disease associations, regulatory prediction, and retrieval‐augmented generation‐based querying. In acromegaly, it nominated PTPN1 as a previously underappreciated candidate, demonstrating its capacity to accelerate mechanistic discovery.
Xingxing Huang, Yulong Bai, Jinfei Zhang, Lihong Zhang, Yongqiang Xing, Zhihui Zhang, Yuanping Lu   +6 more
wiley   +1 more source

Etude, modélisation et réalisation d’un convertisseur DC/AC pour système de pompage photovoltaïque de 4 kVA

Revue des Énergies Renouvelables, 2013
L’estimation des pertes par effet joule de l’étage de puissance est une étape incontournable, lors de la conception d’un convertisseur. En effet, cette estimation nous permet de mieux évaluer les performances du commutateur, de bien dimensionner le ...
S. Chikhi, M.D. Draou, F. Chikhi, A. Mehdaoui, A. Mammeri   +4 more
doaj  

Modelagem e controle de retificadores PWM trifásicos conectados a geradores síncronos a ímãs permanentes em sistemas de conversão de energia eólica [PDF]

, 2011
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia ElétricaNo século XXI, mudanças são esperadas nas formas em que a produção de energia ocorre.
Collier, Daniel Augusto Figueirêdo
core  

High Dynamic Range Turbo‐FLASH B1 Mapping for Characterizing Multi‐Transmit Multi‐Receive RF Arrays, Validated at 7 T and 11.7 T

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Transmit (B1+) and receive (B1−) sensitivities of parallel‐transmit/receive RF array are a prerequisite for modern ultra‐high‐field MRI. Their accurate mapping remains challenging for coils with high transmit dynamic range, particularly in regions with low combined‐mode B1+ magnitude, where standard reconstruction is impaired by noise.
Natalia Dudysheva, Franck Mauconduit, Michel Luong, Alexis Amadon, Nicolas Boulant, Vincent Gras   +5 more
wiley   +1 more source

A Physics‐Informed Koopman Operator Framework for Decentralized Discrete‐Time Sequential Control of a Modular Aerial Parcel Delivery Robot

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT This paper presents a Physics‐Informed Koopman Operator (PIKO) framework integrated with a discrete‐time Sequential Action Control (SAC) for real‐time, decentralized control of a modular aerial parcel delivery robot composed of multiple independently actuated propeller modules.
Archit Krishna Kamath, Peng Shi, Ramesh K. Agarwal   +2 more
wiley   +1 more source

Real‐Time Fractional Control of an Electrohydraulic System Using Low‐Cost Technology

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Advances in control methods for electrohydraulic systems (EHS) improve performance by addressing nonlinearities and unknown parameters, although most studies are limited to numerical simulations. Furthermore, research with experimental validation often relies on high‐performance computing equipment, specialized data acquisition cards, and ...
Edgar H. Robles‐Sauceda, Felipe J. Torres, Antonio J. Balvantín‐García, Miroslava Cano‐Lara, Juan Pablo Ramírez, Israel Martínez   +5 more
wiley   +1 more source

An Integrated Numerical and Bollard Pull Evaluation Approach for Early‐Stage Resistance and Thrust Assessment of a Small Craft

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Early‐stage hydrodynamic assessment of slender multihull vessels is challenged by limited geometric maturity, uncertain propulsion integration, and strong sensitivity to operating conditions. Under such constraints, reliance on a single analytical or numerical method may lead to misleading design decisions due to oversimplification or ...
Chairat Napasaksri, Napat Intaraksa, Chalermkiat Nuchturee, Ramil Kesvarakul, Sarawuth Srinakaew   +4 more
wiley   +1 more source

Digital PWM waveform generation using adders, not counters [PDF]

, 2004
An alternative approach to digital PWM generation using an adder rather than a counter is presented. This offers several advantages. The resolution and gain of the pulse width modulator remain constant regardless of the module clock frequency and PWM ...
Walker, Geoffrey
core  

Advanced resampling techniques for PWM amplifiers in real-time applications

, 2017
Regularly sampled pulse width modulation (PWM) has been a mainstay of the power electronics community since the advent of digital controllers. In this form of PWM the modulating signal is sampled only at either the peaks and/or the troughs of the ...
Ledwich, Gerard F., Burstinghaus, Edward J., Pezeshki, Houman, Walker, Geoffrey R., Broadmeadow, Mark A. H.   +4 more
core   +1 more source