Results 61 to 70 of about 8,538 (212)

An analysis of Nigerian freshwater fishes: those under threat and conservation options [PDF]

, 2005
The study assessed qualitatively the threat status of all nigerian freshwater fishes using such criteria as rarity, size at maturity, mode of reproduction, human population density, habitat degradation, pollution and range of each species among others ...
Bankole, N.O., Olaosebikan, B.D.
core  

Consistently Simulating a Wide Range of Atmospheric Scenarios for K2-18b with a Flexible Radiative Transfer Module

, 2020
The atmospheres of small, potentially rocky exoplanets are expected to cover a diverse range in composition and mass. Studying such objects therefore requires flexible and wide-ranging modeling capabilities.
Godolt, M., Grenfell, J. L., Haus, R., Herbst, K., Kappel, D., Rauer, H., Scheucher, M., Schreier, F., Wunderlich, F.   +8 more
core   +1 more source

A Hybrid Model Reference Adaptive and Regressive‐Form Sliding Mode Control in Discrete Domain: Robustness Under System Uncertainty

Engineering Reports, Volume 7, Issue 12, December 2025.
A novel MRASMC framework is developed, with a sliding surface derived from a regressive structure and parameters adaptively updated. An adaptive trigger condition enhances disturbance rejection without requiring complex observers or full system models.
Nhut Thang Le, Cong Toai Truong, Van Tu Duong, Tan Tien Nguyen, Huy Hung Nguyen   +4 more
wiley   +1 more source

Robust MRAC-based adaptive control of a Doubly Fed Induction Generator (DFIG) in a Wind energy system using a fractional order Integrator

Algerian Journal of Signals and Systems, 2020
This paper presents a robust control of doubly fed induction generator for wind generation system. The whole system is presented in d-q-synchronous reference frame.
Sihem Djebbri, Hanane Balaska, Samir LADACI   +2 more
doaj   +1 more source

Feed‐Forward PID‐Based Cooperative Control Strategy for Air Mass Flow and Pressure in PEMFC Systems

Energy Science &Engineering, Volume 13, Issue 11, Page 5172-5197, November 2025.
This manuscript presents an 86 kW proton exchange membrane fuel cell (PEMFC) with a feed‐forward PID control strategy, tested in an engine environment. The air mass flow and pressure changes are analyzed across three stages: loading, de‐loading, and wide range of sudden load drop. Experimental results demonstrate the control strategy's effectiveness of
Xinhao Bian, Gang Chen, Na Li, Liang Tong, Rui Yang, Boyang Shen   +5 more
wiley   +1 more source

The Development and Challenges of PET/MRI Dual‐Modality Imaging Probes—An Update

Journal of Magnetic Resonance Imaging, Volume 62, Issue 5, Page 1245-1259, November 2025.
ABSTRACT The integration of Positron emission tomography (PET) with Magnetic resonance imaging (MRI) combines the functional imaging capabilities of PET with the high‐resolution anatomical detail of MRI, creating a synergistic platform for advanced diagnostic imaging and image‐guided therapies. Central to the success of this dual‐modality system is the
Maryam Sabbaghan, Saumya Nigam, Isabella Kasabasic, Medha Manepalli, Ping Wang, Jinda Fan   +5 more
wiley   +1 more source

Model reference adaptive control of a nonsmooth dynamical system [PDF]

, 2006
In this paper a modified model reference adaptive control (MRAC) technique is presented which can be used to control systems with nonsmooth characteristics. Using unmodified MRAC on (noisy) nonsmooth systems leads to destabilization of the controller.
B.A. Huberman, B.M. Vinagre, C.W. Wu, D. J. Wagg, D. Virden, D. W. Virden, D.J. Wagg, D.P. Stoten, E.Y.L. Gu, G.A. Gonzalez, G.J. Rey, G.R. Ronki Lamooki, H.K. Qammar, I.M.Y. Mareels, J.A. Leach, L. Yang, M. de la Sen, M. Di Bernardo, P.A. Ioannou, S. A. Neild, S. Townley, S. Townley, V. Petrov, V.H. Nascimento, X. Dong   +24 more
core   +1 more source

Optimized UAV‐Based Relay Algorithm for Enhanced Emergency Wireless Coverage in Disaster Areas

Engineering Reports, Volume 7, Issue 8, August 2025.
An optimized UAV‐based relay algorithm is proposed to enhance emergency wireless coverage in disaster areas. By dynamically adjusting UAV positions and employing energy‐efficient routing, the approach minimizes path loss, improves Device‐to‐Device (D2D) communication, and ensures reliable connectivity for disaster response, enabling seamless ...
Deepika Rani Sona, Kalapraveen Bagadi, Visalakshi Annepu, Olutayo O. Oyerinde, Mekala Manikanta, Kakarla Akash Gangireddy, Swaroop Dintakurthi, Kondreddy Santhosh Kumar Reddy   +7 more
wiley   +1 more source

A Review of Modeling and Control Techniques for Unmanned Aerial Vehicles

Engineering Reports, Volume 7, Issue 6, June 2025.
By systematically classifying UAV modeling techniques and comparing control methods, this paper addresses a notable gap in the current literature. Furthermore, it highlights emerging trends and challenges in UAV control systems, providing valuable insights to guide future research toward enhancing the stability, efficiency, and adaptability of ...
Elisabeth Andarge Gedefaw, Nardos Belay Abera, Chala Merga Abdissa   +2 more
wiley   +1 more source

A Model Reference Adaptive Control Approach to Terrain Following Flight Control System

Düzce Üniversitesi Bilim ve Teknoloji Dergisi
Automatic Flight Control System (AFCS) Terrain Following (TF) mode allows military aircraft to fly at a certain altitude above ground level at a low altitude. TF mode reduces the probability of aircraft detection by enemy airborne radars.
Berk İnan, İbrahim Aliskan
doaj   +1 more source