The Fractal Dimension of River Length Based on the Observed Data by Ni Zhihui, Wu Lichun, Wang Ming-hui, Yi Jing, Zeng Qiang

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Some Observations on the Accelerated Ageing of Thick-Film Resistors by K. J. Wilson, P. E. Spencer, F. N. Sinnadurai

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Observations and Modeling of the Climatic Impact of Land-Use Changes by Xiangzheng Deng, Burak Güneralp, Hongbo Su

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Atrophic Myenteric and Submucosal Neurons Are Observed in Parkinson’s Disease by Bodil Ohlsson, Elisabet Englund

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Coronavirus Disease-19 associated arthritis – An observational study by Debanjali Sinha, Sumantro Mondal, Alakendu Ghosh

“…Various rheumatological manifestations have been reported during or after COVID-19 infection, but data are scarce. In this observational study, we have tried to analyze the clinical characteristics of COVID-19 associated arthralgia/arthritis. …”
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Acute electrocardiographic changes during smoking: an observational study by Balram Bhargava, Sandeep Singh, Ambuj Roy, Sivasubramanian Ramakrishnan, Nitish Naik, Kinjal Bhatt, Akhilesh K Dubey, Sandeep Seth

“…Objective To study the temporal relationship of smoking with electrophysiological changes.Design Prospective observational study.Setting Tertiary cardiac center.Participants Male smokers with atypical chest pain were screened with a treadmill exercise test (TMT). …”
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General Solution and Observability of Singular Differential Systems with Delay by Jiang Wei

“…A general description for the solutions of singular differential systems with delay is given and a necessary and sufficient condition for exact observability of singular differential systems with delay is derived.…”
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Observing the Craft of Mentoring Students During the Year Abroad by Lesley Harbon

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Observations of Anomalous Microwave Emission from HII Regions by Clive Dickinson

“…I give a summary of the observations of Anomalous Microwave Emission (AME) from HII regions. …”
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Multisynchronization of Chaotic Oscillators via Nonlinear Observer Approach by Ricardo Aguilar-López, Rafael Martínez-Guerra, Juan L. Mata-Machuca

“…The Chen oscillator is employed as a benchmark model and a nonlinear observer is proposed to reach synchronicity between the master and the slaves’ oscillators. …”
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Observability and uniqueness theorem for a coupled hyperbolic system by Boris V. Kapitonov, Joel S. Souza

Subjects: “…Observability…”
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Observations of Loki Patera by Juno during Close Flybys by Alessandro Mura, Rosaly M. C. Lopes, Federico Tosi, Francesca Zambon, Roberto Sordini, Peter J. Mouginis-Mark, Julie Rathbun, Scott Bolton, Jani Radebaugh, Alberto Adriani, Andrea Cicchetti, Davide Grassi, Melissa Mirino, Raffaella Noschese, Giuseppe Piccioni, Christina Plainaki, Giuseppe Sindoni

“…We also observed many small (∼3 km wide), closely spaced (∼10 km apart) islands that have persisted in the same locations for at least 45 years, since first being imaged by Voyager 1. …”
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Can We Observe the Gravitational Quantum States of Positronium? by P. Crivelli, V. V. Nesvizhevsky, A. Yu. Voronin

“…We consider the feasibility of observing the gravitational quantum states of positronium. …”
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A Note on the Observability of Temporal Boolean Control Network by Wenping Shi, Bo Wu, Jing Han

“…This paper investigates the observability problem of temporal Boolean control networks. …”
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Comparing Two Observational Systems in the Assessment of Knee Pain by Shannon Fuchs-Lacelle, Thomas Hadjistavropoulos, Donald Sharpe, Jaime Williams, Ronald Martin, Diane LaChapelle

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Observations on the Feeding Habits of Robber Flies. Part I. by S. W. Bromley

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Particle approximations of Wigner distributions for n arbitrary observables by Ralph Sabbagh, Olga Movilla Miangolarra, Hamid Hezari, Tryphon T. Georgiou

“…It is shown that the Wigner distribution associated with these observables can be rigorously approximated by such measures. …”
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Towards Quantifying the Uncertainty in Estimating Observed Scaling Rates by Haider Ali, Hayley J. Fowler, David Pritchard, Geert Lenderink, Stephen Blenkinsop, Elizabeth Lewis

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The Observer’s Guide to the Gamma-Ray Burst Supernova Connection by Zach Cano, Shan-Qin Wang, Zi-Gao Dai, Xue-Feng Wu

“…The discussion presented here places emphasis on how observations, and the modelling of observations, have constrained what we know about GRB-SNe. …”
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Observations on Breeding Behavior of Pachydiplax Longfpennis (Odonata:Libellulidae) by Carol Walser Robey

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