Results 191 to 200 of about 3,349,636 (246)

Diffusion‐Weighted Imaging for the Evaluation of the Sacroiliac Joint in Pediatric Patients

Arthritis Care &Research, EarlyView.
Objective Maturational signal in the sacroiliac joint (SIJ) of skeletally immature youth is often misinterpreted as inflammation. Diagnostic tools that improve specificity are greatly needed. Apparent diffusion coefficient (ADC) values from diffusion‐weighted imaging (DWI), when used with standard imaging, may enhance diagnostic accuracy.
Michael L. Francavilla, Timothy G. Brandon, Dmitry Khrichenko, Rui Xiao, Nancy A. Chauvin, Asef Khwaja, Pamela F. Weiss   +6 more
wiley   +1 more source

Testing a Personalized Approach to Chronic Low Back Pain: A Randomized Controlled Trial in Older Veterans

Arthritis Care &Research, EarlyView.
Objective We aimed to test the efficacy of personalized treatment of older veterans with chronic low back pain (CLBP) delivered by Aging Back Clinics (ABCs) as compared with usual care (UC). Methods Two hundred ninety‐nine veterans aged 65 to 89 with CLBP from three Veterans Affairs (VA) medical centers underwent baseline testing, randomization to ABC ...
Debra K. Weiner, Angela Gentili, Meika A. Fang, Edward Garay, Laura Lawson, Lenore Joseph, Cathy C. Lee, Michelle I. Rossi, Beverly Thorn, Subashan Perera   +9 more
wiley   +1 more source

Clinical Conditions Associated With a High Antinuclear Antibody Titer in Individuals Without Autoimmune Disease

Arthritis Care &Research, EarlyView.
Objective Antinuclear antibodies (ANAs) are present at high titers in 2% of the general population, but their clinical significance in individuals without an autoimmune (AI) disease is not known. We tested the hypothesis that the presence of a high ANA titer in non‐AI conditions is associated with disease.
Matthew Chung, John P. Shelley, Gul Karakoc, John Still, Xiaodi Ruan, Jonathan Mosley, C. Michael Stein, Vivian K. Kawai   +7 more
wiley   +1 more source

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Direct Power Control and Space Vector Modulation‐Based Direct Power Control for Brushless Doubly‐Fed Reluctance Generator

IEEJ Transactions on Electrical and Electronic Engineering, 2023
This paper deduces the quantitative relationship between the flux vectors and the power of power winding (PW) in brushless doubly‐fed reluctance generator (BDFRG). On this basis, the direct power control (DPC) theory of BDFRG is established, which makes up the deficiency that the DPC theory of BDFRG is only based on qualitative analysis in the existing
Long Shi, Shi Jin
openaire   +1 more source

Light-powered direction-controlled micropump

Nano Research, 2018
A micropump induces the flow of its surrounding fluids and is extremely promising in a variety of applications such as chemical sensing or mass transportation. However, it is still challenging to manipulate its pumping direction. In this study, we examine a binary micropump based on perovskite and poly[(2-methoxy-5-ethylhexyloxy)-1,4-phenylenevinylene]
Mingtong Li, Yajun Su, Hui Zhang, Bin Dong   +3 more
openaire   +1 more source

Direct power control for Universal Power Flow Controller series converter

2010 IEEE Energy Conversion Congress and Exposition, 2010
To maximize the power flow in a transmission grid while maintaining stability, unnatural power flows can be enforced by a Unified Power Flow Controller. Theoretically the control of active and reactive power flow can be without overshoot or cross coupling.
Jan Verveckken, Fernando Silva, Dionisio Barros, Johan Driesen   +3 more
openaire   +1 more source

Direct power control of shunt active filter

2007 European Conference on Power Electronics and Applications, 2007
This paper presents a new control method entitled direct power control (DPC) for shunt active power filtering, which is applied to eliminate line current harmonics and compensate reactive power. Its main goal is to rebuild active and reactive powers to be compared to references values using hysteresis control.
Chaoui, Abdelmadjid, Gaubert, Jean-Paul, Krim, Fateh, Rambault, Laurent   +3 more
openaire   +2 more sources

Direct Control of Power System Dynamics

2021
One of the main causes of power system instability is low-damped inter-area oscillations. It is important to damp out low-frequency oscillations effectively and to provide necessary precautions in order to avoid major separations of power systems and cascading blackouts.
Gerard Ledwich, Arash Vahidnia
openaire   +1 more source

Direct power control for distributed PV power system

Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2003
A novel approach to the DSP-based control of photovoltaic (PV) energy storage systems for distributed PV module is presented. A DSP is used to implement the power feedback control, maximum power point tracking (MPPT) and unfalsified control for the PV system. A MPPT control with duty ratio versus PV module output power has been developed.
null Mao-Lin Chiang, null Chih-Chiang Hua, null Jong-Rong Lin   +2 more
openaire   +1 more source

A novel predictive direct power control

11th International Conference on Electrical Power Quality and Utilisation, 2011
In this paper a recently introduced predictive direct power control (P-DPC) method for three-phase power rectifiers is improved by using a more accurate mathematical model. In general P-DPC is a parameter dependent approach and inaccuracies in mathematical model, wrong estimation of the inductor or even filtering the feedback signals may result in ...
Mohsen Mesbah, Mohammad A.S. Masoum, Syed Islam   +2 more
openaire   +1 more source