Results 101 to 110 of about 628,696 (290)

Lamp reliability studies for improved satellite rubidium frequency standard [PDF]

, 1982
In response to the premature failure of Rb lamps used in Rb atomic clocks onboard NAVSTAR GPS satellites experimental and theoretical investigations into their failure mechanism were initiated.
Eckert, H. U., Frueholz, R. P., Jones, P. F., Volk, C. H., Wun-Fogle, M.   +4 more
core   +1 more source

The temporal trends and short‐ and long‐term mortality of people with acute myocardial infarction and rheumatoid arthritis: a nationwide cohort study

Arthritis Care &Research, Accepted Article.
Aims We investigated whether a diagnosis of rheumatoid arthritis (RA) affects the quality of inpatient acute myocardial infarction (AMI) care and long‐term mortality post‐AMI. Methods We analysed data from 784,091 adults, 6,047 with a diagnosis of RA, from England and Wales hospitalised with AMI between 2005 and 2019 from the MINAP registry, linked ...
Megan Butler, Nicholas Weight, Muhammad Rashid, Rodrigo Bagur, Purvi Parwani, Samantha Hider, Edward Roddy, Robert Butler, Mamas A Mamas   +8 more
wiley   +1 more source

Hopfield Neural Networks for Online Constrained Parameter Estimation With Time‐Varying Dynamics and Disturbances

International Journal of Adaptive Control and Signal Processing, EarlyView.
This paper proposes two projector‐based Hopfield neural network (HNN) estimators for online, constrained parameter estimation under time‐varying data, additive disturbances, and slowly drifting physical parameters. The first is a constraint‐aware HNN that enforces linear equalities and inequalities (via slack neurons) and continuously tracks the ...
Miguel Pedro Silva
wiley   +1 more source

Estimating Bus Travel Time Using Survival Models

برنامه‌ریزی و بودجه, 2019
The prevailing model in the studies that estimate bus travel time is the linear regression which assumes the limit of the normal distribution for all observations.
Amir Reza Mamdoohi, Amin Delfan Azari, Mehrdad Alomoradi   +2 more
doaj  

Reliable Method to Detect Alloy Soldering Fractures under Accelerated Life Test

Applied Sciences, 2019
In this research, we investigated the development and design of the Accelerated Life Test (ALT) and its approach to the waste of material. The development of a reliability model is based on the moment at which failure appears.
M.A. Zamora-Antuñano, O. Mendoza-Herbert, M. Culebro-Pérez, A. Rodríguez-Morales, Juvenal Rodríguez-Reséndiz, J.E.E. Gonzalez-Duran, N. Mendez-Lozano, C.A. Gonzalez-Gutierrez   +7 more
doaj   +1 more source

Bistable Mechanisms 3D Printing for Mechanically Programmable Vibration Control

Advanced Engineering Materials, EarlyView.
This work introduces a 3D‐printed bistable mechanism integrated into tuned mass dampers (TMDs) for mechanically adaptive passive vibration suppression. Through optimized geometry, the bistable design provides adaptable vibration reduction across a broad range of scenarios, achieving effective vibration mitigation without complex controls or external ...
Ali Zolfagharian, Frédéric Demoly, Mohammad Lakhi, Bernard Rolfe, Mahdi Bodaghi   +4 more
wiley   +1 more source

Reply to “Matters arising: cost-effectiveness of first-line immunotherapy combinations with or without chemotherapy for advanced non-small cell lung cancer: a modelling approach”

BMC Cancer
In this article, we read with great attention the correspondence by Bullement et al., regarding our published study on cost-effectiveness of first-line immunotherapy combinations with or without chemotherapy for advanced non-small cell lung cancer.
Wen Hui, Zhixiang Gao, Min Zhu, Huazhang Wu, Yuanyi Cai   +4 more
doaj   +1 more source

Estimating Covariances and Goodness of Fit Plots for Accelerated Failure Time Models

Axioms
Let the response variable Y be the time until an event such as death. Assume that there are p predictors x1,…,xp and that the response variable is right censored.
David J. Olive, Sanjuka Johana Lemonge
doaj   +1 more source

Pre-Production and Quality Assurance of the Mu2e Calorimeter Silicon Photomultipliers

, 2017
The Mu2e electromagnetic calorimeter has to provide precise information on energy, time and position for $\sim$100 MeV electrons. It is composed of 1348 un-doped CsI crystals, each coupled to two large area Silicon Photomultipliers (SiPMs). A modular and
Cervelli, F., Cordelli, M., Di Falco, S., Diociaiuti, E., Donati, S., Donghia, R., Ferrari, A., Giovannella, S., Happacher, F., Martini, M., Miscetti, S., Morescalchi, L., Muller, S., Pedreschi, E., Pezzullo, G., Sarra, I., Spinella, F.   +16 more
core   +1 more source

Enhancing Corrosion Resistance and Mechanical Strength of 3D‐Printed Iron Polylactic Acid for Marine Applications via Laser Surface Texturing

Advanced Engineering Materials, EarlyView.
Laser surface texturing significantly improves the corrosion resistance and mechanical strength of 3D‐printed iron polylactic acid (Ir‐PLA) for marine applications. Optimal laser parameters reduce corrosion by 80% and enhance tensile strength by 25% and ductility by 15%.
Mohammad Rezayat, Mojtaba Karamimoghadam, Mohammadreza Lalegani Dezaki, Ali Zolfagharian, Giuseppe Casalino, Antonio Mateo, Mahdi Bodaghi   +6 more
wiley   +1 more source