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Journal articles on the topic 'Condition-dependent signals'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Buchanan, Katherine L. "Stress and the evolution of condition-dependent signals." Trends in Ecology & Evolution 15, no. 4 (2000): 156–60. http://dx.doi.org/10.1016/s0169-5347(99)01812-1.

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Schantz, Torbjörn von, Staffan Bensch, Mats Grahn, Dennis Hasselquist, and Håkan Wittzell. "Good genes, oxidative stress and condition–dependent sexual signals." Proceedings of the Royal Society of London. Series B: Biological Sciences 266, no. 1414 (1999): 1–12. http://dx.doi.org/10.1098/rspb.1999.0597.

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Garratt, Michael, and Robert C. Brooks. "Oxidative stress and condition-dependent sexual signals: more than just seeing red." Proceedings of the Royal Society B: Biological Sciences 279, no. 1741 (2012): 3121–30. http://dx.doi.org/10.1098/rspb.2012.0568.

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The links between fitness, health, sexual signals and mate choice are complex and subject to ongoing study. In 1999, von Schantz et al . made the valuable suggestion that oxidative stress may be an important missing piece of this complex puzzle. Their suggestion has been enthusiastically tested, with over 300 studies citing their paper, but most effort has concerned carotenoid-based (and to a lesser extent melanin-based) visual signals, predominantly in birds and fishes. Today, we know a great deal more about oxidative stress and related physiology, in both a pathological and regulatory sense,

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Hill, Geoffrey E. "Condition-dependent traits as signals of the functionality of vital cellular processes." Ecology Letters 14, no. 7 (2011): 625–34. http://dx.doi.org/10.1111/j.1461-0248.2011.01622.x.

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Brepson, Loïc, Yann Voituron, and Thierry Lengagne. "Condition-dependent ways to manage acoustic signals under energetic constraint in a tree frog." Behavioral Ecology 24, no. 2 (2012): 488–96. http://dx.doi.org/10.1093/beheco/ars189.

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Galeotti, P., R. Sacchi, M. Fasola, D. Pellitteri Rosa, M. Marchesi, and D. Ballasina. "Courtship displays and mounting calls are honest, condition-dependent signals that influence mounting success in Hermann's tortoises." Canadian Journal of Zoology 83, no. 10 (2005): 1306–13. http://dx.doi.org/10.1139/z05-130.

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Like other terrestrial tortoises, the courtship behaviour of Hermann's tortoises (Testudo hermanni Gmelin, 1789) is based on a multiple signalling system that involves visual, olfactory, tactile, and acoustic signals. In this study, we analysed relationships between male morphology, hematological profile, courtship intensity, vocalizations, and mounting success in Hermann's tortoises breeding in semi-natural enclosures to investigate the effects of male condition on signals exhibited during courtship and on their mounting success. Results showed that mounting success of Hermann's tortoise male

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Burmeister, Sabrina S., Verónica G. Rodriguez Moncalvo, and Karin S. Pfennig. "Differential encoding of signals and preferences by noradrenaline in the anuran brain." Journal of Experimental Biology 223, no. 18 (2020): jeb214148. http://dx.doi.org/10.1242/jeb.214148.

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ABSTRACTSocial preferences enable animals to selectively interact with some individuals over others. One influential idea for the evolution of social preferences is that preferred signals evolve because they elicit greater neural responses from sensory systems. However, in juvenile plains spadefoot toad (Spea bombifrons), a species with condition-dependent mating preferences, responses of the preoptic area, but not of the auditory midbrain, mirror adult social preferences. To examine whether this separation of signal representation from signal valuation generalizes to other anurans, we compare

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Baskar, P., S. Padmanabhan, and M. Syed Ali. "Novel delay-dependent stability condition for mixed delayed stochastic neural networks with leakage delay signals." International Journal of Computer Mathematics 96, no. 6 (2018): 1107–20. http://dx.doi.org/10.1080/00207160.2018.1439581.

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Mas, Flore, and Mathias Kölliker. "Differential effects of offspring condition-dependent signals on maternal care regulation in the European earwig." Behavioral Ecology and Sociobiology 65, no. 2 (2010): 341–49. http://dx.doi.org/10.1007/s00265-010-1051-8.

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Bittner, Kai, and Hans Georg Brachtendorf. "Optimal frequency sweep method in multi-rate circuit simulation." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 4 (2014): 1189–97. http://dx.doi.org/10.1108/compel-11-2012-0346.

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Purpose – Radio-frequency circuits often possess a multi-rate behavior. Slow changing baseband signals and fast oscillating carrier signals often occur in the same circuit. Frequency modulated signals pose a particular challenge. The paper aims to discuss these issues. Design/methodology/approach – The ordinary circuit differential equations are first rewritten by a system of (multi-rate) partial differential equations in order to decouple the different time scales. For an efficient simulation the paper needs an optimal choice of a frequency-dependent parameter. This is achieved by an addition

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Harris, Sarah, Matti Kervinen, Christophe Lebigre, Thomas W. Pike, and Carl D. Soulsbury. "Full spectra coloration and condition-dependent signaling in a skin-based carotenoid sexual ornament." Behavioral Ecology 31, no. 3 (2020): 834–43. http://dx.doi.org/10.1093/beheco/araa031.

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Abstract Carotenoid-based traits commonly act as condition-dependent signals of quality to both males and females. Such colors are typically quantified using summary metrics (e.g., redness) derived by partitioning measured reflectance spectra into blocks. However, perceived coloration is a product of the whole spectrum. Recently, new methods have quantified a range of environmental factors and their impact on reflection data at narrow wavebands across the whole spectrum. Using this approach, we modeled the reflectance of red integumentary eye combs displayed by male black grouse (Lyrurus tetri

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Drea, Christine M. "Design, delivery and perception of condition-dependent chemical signals in strepsirrhine primates: implications for human olfactory communication." Philosophical Transactions of the Royal Society B: Biological Sciences 375, no. 1800 (2020): 20190264. http://dx.doi.org/10.1098/rstb.2019.0264.

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The study of human chemical communication benefits from comparative perspectives that relate humans, conceptually and empirically, to other primates. All major primate groups rely on intraspecific chemosignals, but strepsirrhines present the greatest diversity and specialization, providing a rich framework for examining design, delivery and perception. Strepsirrhines actively scent mark, possess a functional vomeronasal organ, investigate scents via olfactory and gustatory means, and are exquisitely sensitive to chemically encoded messages. Variation in delivery, scent mixing and multimodality

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Pellitteri-Rosa, Daniele, Roberto Sacchi, Paolo Galeotti, Manuela Marchesi, and Mauro Fasola. "Courtship Displays Are Condition-Dependent Signals That Reliably Reflect Male Quality in Greek Tortoises,Testudo graeca." Chelonian Conservation and Biology 10, no. 1 (2011): 10–17. http://dx.doi.org/10.2744/ccb-0840.1.

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Furlow, F. Bryant. "The Crying Game." Evolution of Communication 1, no. 1 (1997): 35–57. http://dx.doi.org/10.1075/eoc.1.1.03fur.

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Evolutionary models of offspring solicitation systems have emphasized the potential for offspring manipulation of parents and the role of signal production costs in limiting exaggeration of need by offspring. Another, neglected possible evolutionary function of offspring solicitation is competition with siblings for access to limited parental resources via condition-dependent displays of probable offspring contributions to parental fitness. In this brief review of the behavioral ecological literature, I report that offspring phenotypic quality is indeed a common positive correlate of parental

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Lv, Zhi Jun, Qian Xiang, and Jing Zhu Pang. "An Artificial Immune Algorithm Based Intelligent Monitoring System in Grinding Process." Advanced Materials Research 189-193 (February 2011): 2759–63. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2759.

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Grinding is widely used as a precision process for machining difficult-to-cut materials. Grinding productivity is still greatly dependent on the experience and skill of human operators. Focusing on the indirect method, an attempt was made to build up an intelligent system to monitor the condition of grinding wheels with force signals and the acoustic emission (AE) signals. An artificial immune algorithm based multi-signals processing method was presented in this paper. The intelligent system is capable of incremental supervised learning of grinding conditions and quickly pattern recognition, a

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Akematsu, Yoshiaki, Hiromitsu Gotho, Takayuki Tani, Hideaki Murayama, Tsuyoshi Matsuo, and Kazuro Kageyama. "Monitoring of the High-Technology Nailing of CFRTP Material under Ultrasonic Vibration by Acoustic Emission Method." Materials Science Forum 1009 (August 2020): 25–30. http://dx.doi.org/10.4028/www.scientific.net/msf.1009.25.

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In this study, the potential to monitor the high-technology nailing of carbon fiber reinforced thermoplastic material (CFRTP) under ultrasonic vibration was investigated by acoustic emission (AE) method. AE signals were detected by a piezoelectric AE sensor during high-technology nailing under ultrasonic vibration. This paper describes some experimental results on AE signal characteristics and observation of the high-technology nailing. In order to investigate the effects of machining condition, we focused on RMS voltage, which is dependent on the energy parameter of the AE signal. It was foun

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Hui, Kar Hoou, Lim Meng Hee, M. Salman Leong, and Ahmed M. Abdelrhman. "Time-Frequency Signal Analysis in Machinery Fault Diagnosis: Review." Advanced Materials Research 845 (December 2013): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amr.845.41.

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Growing demand of machines such as gas turbine, pump, and compressor in power generation, aircraft, and other fields have yielded the transformation of machine maintenance strategy from corrective and preventive to condition-based maintenance. Real-time fault diagnosis has grabbed attention of researchers in looking for a better approach to overcome current limitation. The parameters of health condition in machinery could be monitored thus faults could be detected and diagnosed by using signal analysis approach. Since some fault signals are non-stationary or time dependent in nature, therefore

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LONG, FEI, and DONGCHENG MEI. "ASYMMETRIC EFFECTS ON STOCHASTIC RESONANCE IN THE BISTABLE SYSTEM SUBJECT TO CORRELATED NOISES." International Journal of Modern Physics B 26, no. 24 (2012): 1250125. http://dx.doi.org/10.1142/s0217979212501251.

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Asymmetric effects on the stochastic resonance (SR) in the bistable system with correlated noises are investigated. Based on the theory of signal-to-noise ratio (SNR), the expressions of SNR are derived for the case of the additive signal and the case of the multiplicative signal, respectively. Through the numerical computation, it is found in both cases of additive and multiplicative periodic signals (i) The asymmetric effects on SR phenomenon in the system induced by the multiplicative noise is dependent of initial conditions, i.e., the asymmetric parameter r weakens the SR for the initial c

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Bianciardi, Marta, Masaki Fukunaga, Peter van Gelderen, Jacco A. de Zwart, and Jeff H. Duyn. "Negative BOLD-fMRI Signals in Large Cerebral Veins." Journal of Cerebral Blood Flow & Metabolism 31, no. 2 (2010): 401–12. http://dx.doi.org/10.1038/jcbfm.2010.164.

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Reductions in blood oxygenation level dependent (BOLD)-functional magnetic resonance imaging (fMRI) signals below baseline levels have been observed under several conditions as negative activation in task-activation studies or anticorrelation in resting-state experiments. Converging evidence suggests that negative BOLD signals (NBSs) can generally be explained by local reductions in neural activity. Here, we report on NBSs that accompany hemodynamic changes in regions devoid of neural tissue. The NBSs were investigated with high-resolution studies of the visual cortex (VC) at 7T. Task-activati

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KASLOVSKY, DANIEL N., and FRANÇOIS G. MEYER. "NOISE CORRUPTION OF EMPIRICAL MODE DECOMPOSITION AND ITS EFFECT ON INSTANTANEOUS FREQUENCY." Advances in Adaptive Data Analysis 02, no. 03 (2010): 373–96. http://dx.doi.org/10.1142/s1793536910000537.

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Huang's Empirical Mode Decomposition (EMD) is an algorithm for analyzing nonstationary data that provides a localized time-frequency representation by decomposing the data into adaptively defined modes. EMD can be used to estimate a signal's instantaneous frequency (IF) but suffers from poor performance in the presence of noise. To produce a meaningful IF, each mode of the decomposition must be nearly monochromatic, a condition that is not guaranteed by the algorithm and fails to be met when the signal is corrupted by noise. In this work, the extraction of modes containing both signal and nois

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Maruska, Karen P., and Julie M. Butler. "Endocrine Modulation of Sending and Receiving Signals in Context-Dependent Social Communication." Integrative and Comparative Biology 61, no. 1 (2021): 182–92. http://dx.doi.org/10.1093/icb/icab074.

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Abstract Animal communication requires senders to transmit signals through the environment to conspecific receivers, which then leads to context-dependent behavioral decisions. Sending and receiving sensory information in social contexts, however, can be dramatically influenced by an individual’s internal state, particularly in species that cycle in and out of breeding or other physiological condition like nutritional state or social status. Modulatory substances like steroids, peptides, and biogenic amines can influence both the substrates used for sending social signals (e.g., motivation cen

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David, Morgan, Yannick Auclair, Sasha R. X. Dall, and Frank Cézilly. "Pairing context determines condition-dependence of song rate in a monogamous passerine bird." Proceedings of the Royal Society B: Biological Sciences 280, no. 1753 (2013): 20122177. http://dx.doi.org/10.1098/rspb.2012.2177.

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Condition-dependence of male ornaments is thought to provide honest signals on which females can base their sexual choice for genetic quality. Recent studies show that condition-dependence patterns can vary within populations. Although long-term association is thought to promote honest signalling, no study has explored the influence of pairing context on the condition-dependence of male ornaments. In this study, we assessed the influence of natural variation in body condition on song rate in zebra finches ( Taeniopygia guttata ) in three different situations: during short and long encounters w

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Slade, J. W. G., M. J. Watson, and E. A. MacDougall-Shackleton. "Birdsong signals individual diversity at the major histocompatibility complex." Biology Letters 13, no. 11 (2017): 20170430. http://dx.doi.org/10.1098/rsbl.2017.0430.

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The major histocompatibility complex (MHC) plays a key role in vertebrate immunity, and pathogen-mediated selection often favours certain allelic combinations. Assessing potential mates' MHC profiles may provide receivers with genetic benefits (identifying MHC-compatible mates and producing optimally diverse offspring) and/or material benefits (identifying optimally diverse mates capable of high parental investment). Oscine songbirds learn songs during early life, such that song repertoire content can reflect population of origin while song complexity can reflect early life condition. Thus bir

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Deb, Rittik, Sambita Modak, and Rohini Balakrishnan. "Baffling: a condition-dependent alternative mate attraction strategy using self-made tools in tree crickets." Proceedings of the Royal Society B: Biological Sciences 287, no. 1941 (2020): 20202229. http://dx.doi.org/10.1098/rspb.2020.2229.

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Intense sexual selection in the form of mate choice can facilitate the evolution of different alternative reproductive strategies, which can be condition-dependent. Tree cricket males produce long-distance acoustic signals which are used by conspecific females for mate localization and mate choice. Our study shows that baffling, an acoustic call amplification strategy employed by male tree crickets using self-made tools, is a classic example of a condition-dependent alternative strategy. We show that though most males can baffle, less preferred males, such as smaller and lower-amplitude caller

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Feige, Bernd, Klaus Scheffler, Fabrizio Esposito, Francesco Di Salle, Jürgen Hennig, and Erich Seifritz. "Cortical and Subcortical Correlates of Electroencephalographic Alpha Rhythm Modulation." Journal of Neurophysiology 93, no. 5 (2005): 2864–72. http://dx.doi.org/10.1152/jn.00721.2004.

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Neural correlates of electroencephalographic (EEG) alpha rhythm are poorly understood. Here, we related EEG alpha rhythm in awake humans to blood-oxygen-level-dependent (BOLD) signal change determined by functional magnetic resonance imaging (fMRI). Topographical EEG was recorded simultaneously with fMRI during an open versus closed eyes and an auditory stimulation versus silence condition. EEG was separated into spatial components of maximal temporal independence using independent component analysis. Alpha component amplitudes and stimulus conditions served as general linear model regressors

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Campese, Antonio F., Annette I. Garbe, Fangrong Zhang, Fabio Grassi, Isabella Screpanti, and Harald von Boehmer. "Notch1-dependent lymphomagenesis is assisted by but does not essentially require pre-TCR signaling." Blood 108, no. 1 (2006): 305–10. http://dx.doi.org/10.1182/blood-2006-01-0143.

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Overexpression of intracellular Notch plays an important role in the generation of human acute lymphoblastic T cell leukemia (T-ALL). In mouse models, it was shown that Notch-dependent T-ALL required pre-TCR signaling. Here we show that pre-TCR signaling is required to condition mice for Notch-dependent transformation but that it is not required to sustain malignant growth of T-ALL. In contrast to previous studies, we found that disease development does not require pre-TCR but that it can be accelerated in Rag2-/- mice by transient mimicking of pre-TCR signals. (Blood. 2006;108:305-310)

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Marler, Jeffrey A., and Craig A. Champlin. "Sensory Processing of Backward-Masking Signals in Children With Language-Learning Impairment As Assessed With the Auditory Brainstem Response." Journal of Speech, Language, and Hearing Research 48, no. 1 (2005): 189–203. http://dx.doi.org/10.1044/1092-4388(2005/014).

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The purpose of this study was to examine the possible contribution of sensory mechanisms to an auditory processing deficit shown by some children with language-learning impairment (LLI). Auditory brainstem responses (ABRs) were measured from 2 groups of school-aged (8–10 years) children. One group consisted of 10 children with LLI, and the other group (control) consisted of 10 children with normally developing language. The ABR was elicited with a brief tone burst presented either alone (no-masking condition) or immediately followed by a longer duration noise burst (backward-masking condition)

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Silva, Rui, and António Araújo. "A Novel Approach to Condition Monitoring of the Cutting Process Using Recurrent Neural Networks." Sensors 20, no. 16 (2020): 4493. http://dx.doi.org/10.3390/s20164493.

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Condition monitoring is a fundamental part of machining, as well as other manufacturing processes where, generally, there are parts that wear out and have to be replaced. Devising proper condition monitoring has been a concern of many researchers, but there is still a lack of robustness and efficiency, most often hindered by the system’s complexity or otherwise limited by the inherent noisy signals, a characteristic of industrial processes. The vast majority of condition monitoring approaches do not take into account the temporal sequence when modelling and hence lose an intrinsic part of the

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Shin, Ki Hong. "A New Signal Processing Technique to Estimate Velocity Dependent Dynamic Friction Coefficient." Key Engineering Materials 321-323 (October 2006): 1241–44. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1241.

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In general, dynamic friction coefficient in a dry surface condition is dependent on the relative velocity between two sliding bodies. A conventional method of estimating the velocity dependent dynamic friction coefficient is time consuming and requires a special jig to measure the friction forces. In this paper, a new technique called the state space mapping method is proposed based on the nonlinear dynamics of a 1-DOF friction oscillator. One body is constructed as a single degree of freedom system and another body is formed as a moving base that may be built as a rotating disk or a horizonta

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Sharoh, Daniel, Tim van Mourik, Lauren J. Bains, et al. "Laminar specific fMRI reveals directed interactions in distributed networks during language processing." Proceedings of the National Academy of Sciences 116, no. 42 (2019): 21185–90. http://dx.doi.org/10.1073/pnas.1907858116.

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Interactions between top-down and bottom-up information streams are integral to brain function but challenging to measure noninvasively. Laminar resolution, functional MRI (lfMRI) is sensitive to depth-dependent properties of the blood oxygen level-dependent (BOLD) response, which can be potentially related to top-down and bottom-up signal contributions. In this work, we used lfMRI to dissociate the top-down and bottom-up signal contributions to the left occipitotemporal sulcus (LOTS) during word reading. We further demonstrate that laminar resolution measurements could be used to identify con

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de Moraes, Pedro Z., Pedro Diniz, Esteban Fernandez-Juricic, and Regina H. Macedo. "Flirting with danger: predation risk interacts with male condition to influence sexual display." Behavioral Ecology 30, no. 5 (2019): 1265–72. http://dx.doi.org/10.1093/beheco/arz073.

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AbstractSexual signaling coevolves with the sensory systems of intended receivers; however, predators may be unintended receivers of sexual signals. Conspicuous aerial displays in some species may place males at high risk of predation from eavesdropping predators. There are three different hypotheses to explain how signaling males can deal with increased predation risk: (1) males invest in survival by decreasing signal conspicuousness; (2) males invest in reproduction by increasing signal conspicuousness; and (3) male response is condition-dependent according to his residual reproductive value

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Wang, Jia, and Zhigang Li. "Degradation model of multi-signals based on a novel feature-selection criterion." Structural Health Monitoring 17, no. 6 (2017): 1491–502. http://dx.doi.org/10.1177/1475921717746091.

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In most data-driven prognostics approaches, features extracted from measurements are used in the model to indicate the degradation process and determine the reliability in real time. However, many features with physical meaning commonly exhibit no variation until a failure occurs, which leaves little time to conduct maintenance strategies or replacement policies. Hence, this research presents a novel feature-selection criterion, which enables to select a feature with an obvious trend throughout the entire life, thereby avoiding the problem mentioned. In addition, for reliability estimation and

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Gabirot, Marianne, Pilar López, and José MartÍn. "Female mate choice based on pheromone content may inhibit reproductive isolation between distinct populations of Iberian wall lizards." Current Zoology 59, no. 2 (2013): 210–20. http://dx.doi.org/10.1093/czoolo/59.2.210.

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Abstract The Iberian wall lizard Podarcis hispanica forms part of a species complex with several morphologically and genetically distinct types and populations, which may or may not be reproductively isolated. We analyzed whether female mate choice based on males’ chemical signals may contribute to a current pre-mating reproductive isolation between two distinct populations of P. hispanica from central Spain. We experimentally examined whether females choose to establish territories on areas scent-marked by males of their own population, versus areas marked by males of the other population. Re

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Rodríguez-Ruiz, Gonzalo, Jesús Ortega, José Javier Cuervo, Pilar López, Alfredo Salvador, and José Martín. "Male rock lizards may compensate reproductive costs of an immune challenge affecting sexual signals." Behavioral Ecology 31, no. 4 (2020): 1017–30. http://dx.doi.org/10.1093/beheco/araa047.

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Abstract Sexual signals can be evolutionarily stable if they are condition dependent or costly to the signaler. One of these costs may be the trade-off between maintaining the immune system and the elaboration of ornaments. Experimental immune challenges in captivity show a reduction in the expression of sexual signals, but it is not clear whether these detrimental effects are important in nature and, more importantly, whether they have reproductive consequences. We designed a field experiment to challenge the immune system of wild male Carpetan rock lizards, Iberolacerta cyreni, with a bacter

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Ahow, Maryse, Le Min, Macarena Pampillo та ін. "KISS1R Signals Independently of Gαq/11 and Triggers LH Secretion via the β-Arrestin Pathway in the Male Mouse". Endocrinology 155, № 11 (2014): 4433–46. http://dx.doi.org/10.1210/en.2014-1304.

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Abstract Hypothalamic GnRH is the master regulator of the neuroendocrine reproductive axis, and its secretion is regulated by many factors. Among these is kisspeptin (Kp), a potent trigger of GnRH secretion. Kp signals via the Kp receptor (KISS1R), a Gαq/11-coupled 7-transmembrane–spanning receptor. Until this study, it was understood that KISS1R mediates GnRH secretion via the Gαq/11-coupled pathway in an ERK1/2-dependent manner. We recently demonstrated that KISS1R also signals independently of Gαq/11 via β-arrestin and that this pathway also mediates ERK1/2 activation. Because GnRH secretio

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Meddour, Cherif, and Malika Kedir-Talha. "NEW METHOD EXPLOITING A HYBRID TECHNIQUES FOR FETAL CARDIAC SIGNAL EXTRACTION." Biomedical Engineering: Applications, Basis and Communications 31, no. 04 (2019): 1950027. http://dx.doi.org/10.4015/s1016237219500273.

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According to WHO, 2.6 million babies die during pregnancy. Good monitoring during the prenatal period could provide a significant reduction of this mortality rate. This is possible by detection and extraction of the fetal electrocardiogram (FECG). Extraction of that information is complex due to other noise coming from the mother and within the fetus that drowns out the fetal heart signal. However, new technology and improved filtering technique have provided ways to more accurately and efficiently gather various electrical components regarding fetal heart condition. In this paper, we propose

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Coronel, Aníbal, Fernando Huancas, Ian Hess, Esperanza Lozada, and Francisco Novoa-Muñoz. "Analysis of a SEIR-KS Mathematical Model For Computer Virus Propagation in a Periodic Environment." Mathematics 8, no. 5 (2020): 761. http://dx.doi.org/10.3390/math8050761.

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In this work we develop a study of positive periodic solutions for a mathematical model of the dynamics of computer virus propagation. We propose a generalized compartment model of SEIR-KS type, since we consider that the population is partitioned in five classes: susceptible (S); exposed (E); infected (I); recovered (R); and kill signals (K), and assume that the rates of virus propagation are time dependent functions. Then, we introduce a sufficient condition for the existence of positive periodic solutions of the generalized SEIR-KS model. The proof of the main results are based on a priori

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Porr, Bernd, and Florentin Wörgötter. "Isotropic Sequence Order Learning." Neural Computation 15, no. 4 (2003): 831–64. http://dx.doi.org/10.1162/08997660360581921.

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In this article, we present an isotropic unsupervised algorithm for temporal sequence learning. No special reward signal is used such that all inputs are completely isotropic. All input signals are bandpass filtered before converging onto a linear output neuron. All synaptic weights change according to the correlation of bandpass-filtered inputs with the derivative of the output. We investigate the algorithm in an open- and a closed-loop condition, the latter being defined by embedding the learning system into a behavioral feedback loop. In the open-loop condition, we find that the linear stru

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Whiting, Martin J., Jonathan K. Webb, and J. Scott Keogh. "Flat lizard female mimics use sexual deception in visual but not chemical signals." Proceedings of the Royal Society B: Biological Sciences 276, no. 1662 (2009): 1585–91. http://dx.doi.org/10.1098/rspb.2008.1822.

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Understanding what constrains signalling and maintains signal honesty is a central theme in animal communication. Clear cases of dishonest signalling, and the conditions under which they are used, represent an important avenue for improved understanding of animal communication systems. Female mimicry, when certain males take on the appearance of females, is most commonly a male alternative reproductive tactic that is condition-dependent. A number of adaptive explanations for female mimicry have been proposed including avoiding the costs of aggression, gaining an advantage in combat, sneaking c

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Nakandhrakumar, Ramasamay S., D. Dinakaran, S. Satishkumar, and M. Gopal. "Influence of Sensor Positioning in Tool Condition Monitoring of Drilling Process through Vibration Analysis." Advanced Materials Research 984-985 (July 2014): 564–69. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.564.

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In this study, the relationship between vibration and tool wear and also influence of sensor positioning in tool codition monitoring were investigated during drilling. For this purpose, a series of experiment were conducted in a CNC vertical milling machine using drilling cycle. A 6 mm diameter HSS drill and EN24 as workpiece material were used in these experiments. The vibration was measured in the transverse direction of sensor which is positioned on the workpiece with constant distance from the holes to be drilled for monitoring tool wear as in previous studies. But, positioning of sensor i

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Liu, Tiejun, Dujian Zou, Chengcheng Du, and Ying Wang. "Influence of axial loads on the health monitoring of concrete structures using embedded piezoelectric transducers." Structural Health Monitoring 16, no. 2 (2016): 202–14. http://dx.doi.org/10.1177/1475921716670573.

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Piezoceramic-based smart aggregate has been widely used to evaluate early-age concrete strength and to detect damage in concrete structures. In these structural health monitoring systems, they are generally verified and calibrated through experiments under load-free condition. However, the stress levels of actual concrete members are different. The microstructures of concrete will change with the variation of external load, and the high-frequency waves used in the monitoring system may be highly sensitive to these changes. In this study, the effects of axial compressive loading on the monitori

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D’Aniello, Biagio, Barbara Fierro, Anna Scandurra, Claudia Pinelli, Massimo Aria, and Gün R. Semin. "Sex differences in the behavioral responses of dogs exposed to human chemosignals of fear and happiness." Animal Cognition 24, no. 2 (2021): 299–309. http://dx.doi.org/10.1007/s10071-021-01473-9.

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AbstractThis research focuses on sex differences in the behavioral patterns of dogs when they are exposed to human chemosignals (sweat) produced in happy and fear contexts. No age, breed or apparatus-directed behavior differences were found. However, when exposed to fear chemosignals, dogs’ behavior towards their owners, and their stress signals lasted longer when compared to being exposed to happiness as well as control chemosignals. In the happy odor condition, females, in contrast to males, displayed a significantly higher interest to the stranger compared to their owner. In the fear condit

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RAPP, P. E., C. J. CELLUCCI, T. A. A. WATANABE, and A. M. ALBANO. "QUANTITATIVE CHARACTERIZATION OF THE COMPLEXITY OF MULTICHANNEL HUMAN EEGS." International Journal of Bifurcation and Chaos 15, no. 05 (2005): 1737–44. http://dx.doi.org/10.1142/s0218127405012764.

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In this contribution, eleven different measures of the complexity of multichannel EEGs are described, and their effectiveness in discriminating between two behavioral conditions (eyes open resting versus eyes closed resting) is compared. Ten of the methods were variants of the algorithmic complexity and the covariance complexity. The eleventh measure was a multivariate complexity measure proposed by Tononi and Edelman. The most significant between-condition change was observed with Tononi–Edelman complexity which decreased in the eyes open condition. Of the algorithmic complexity measures test

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Hernández, América, Margarita Martínez-Gómez, René Beamonte-Barrientos, and Bibiana Montoya. "Colourful traits in female birds relate to individual condition, reproductive performance and male-mate preferences: a meta-analytic approach." Biology Letters 17, no. 9 (2021): 20210283. http://dx.doi.org/10.1098/rsbl.2021.0283.

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Colourful traits in females are suggested to have evolved and be maintained by sexual selection. Although several studies have evaluated this idea, support is still equivocal. Evidence has been compiled in reviews, and a handful of quantitative syntheses has explored cumulative support for the link between condition and specific colour traits in males and females. However, understanding the potential function of females' colourful traits in sexual communication has not been the primary focus of any of those previous studies. Here, using a meta-analytic approach, we find that evidence from empi

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Owen, M. A., and D. C. Lahti. "Sexual dimorphism and condition dependence in the anal pad of the small Indian mongoose (Herpestes auropunctatus)." Canadian Journal of Zoology 93, no. 5 (2015): 397–402. http://dx.doi.org/10.1139/cjz-2014-0288.

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Secondary sexual traits tend to be sexually dimorphic, and theory predicts that such traits should also be condition-dependent in a sex-specific manner. We investigate these phenomena in a field study of the small Indian mongoose (Herpestes auropunctatus (Hodgson, 1836); formerly Herpestes javanicus (É. Geoffroy Saint-Hillaire, 1818)), in the first attempt at understanding secondary sexual traits and sexual selection in this species. Small Indian mongooses are solitary and nonterritorial, and they likely depend on chemical (scent) rather than visual or acoustic signals for communication. Addit

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Qi, Dong, Min Tang, Shiwen Chen, Zhixin Liu, and Yongjun Zhao. "DOA Estimation and Self-Calibration under Unknown Mutual Coupling." Sensors 19, no. 4 (2019): 978. http://dx.doi.org/10.3390/s19040978.

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In practical applications, the assumption of omnidirectional elements is not effective in general, which leads to the direction-dependent mutual coupling (MC). Under this condition, the performance of traditional calibration algorithms suffers. This paper proposes a new self-calibration method based on the time-frequency distributions (TFDs) in the presence of direction-dependent MC. Firstly, the time-frequency (TF) transformation is used to calculate the space-time-frequency distributions (STFDs) matrix of received signals. After that, the estimated steering vector and corresponding noise sub

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BROWN, GREGORY G., SANDRA S. KINDERMANN, GREG J. SIEGLE, ERIC GRANHOLM, ERIC C. WONG, and RICHARD B. BUXTON. "Brain activation and pupil response during covert performance of the Stroop Color Word task." Journal of the International Neuropsychological Society 5, no. 4 (1999): 308–19. http://dx.doi.org/10.1017/s1355617799544020.

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Patterns of brain activation associated with covert performance of the Stroop Color–Word task were studied in young, healthy, adult volunteers using blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI). Comparisons of the incongruous Stroop condition were made with both color naming and word reading baselines. Areas of the left and right anterior cingulate, the right precuneus, and the left pars opercularis displayed larger BOLD signal responses during the incongruous Stroop condition than during baseline conditions. Activation of BOLD signals in these areas was hig

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Tao, Wei, Zhiqian Lu, Qiaozhi He, Pengfei Lv, Qian Wang, and Hui Zhao. "Research on the Temperature Characteristics of the Photoacoustic Sensor of Glucose Solution." Sensors 18, no. 12 (2018): 4323. http://dx.doi.org/10.3390/s18124323.

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In order to weaken the influence of temperature on photoacoustic (PA) measurements and compensate PA signals with a proposed theoretical model, the relationship of PA signal amplitude with temperature, under the condition of different glucose concentrations and different light intensities, was studied in this paper. First, the theoretical model was derived from the theory of the PA effect. Then, the temperature characteristics of the PA signals were investigated, based on the analyses of the temperature-dependent Grüneisen parameter in glucose solution. Next, the concept of a PA temperature co

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Smart, W. C., J. A. Coffman, and T. G. Cooper. "Combinatorial regulation of the Saccharomyces cerevisiae CAR1 (arginase) promoter in response to multiple environmental signals." Molecular and Cellular Biology 16, no. 10 (1996): 5876–87. http://dx.doi.org/10.1128/mcb.16.10.5876.

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CAR1 (arginase) gene expression responds to multiple environmental signals; expression is induced in response to the intracellular accumulation of arginine and repressed when readily transported and catabolized nitrogen sources are available in the environment. Up to 14 cis-acting sites and 9 trans-acting factors have been implicated in regulated CAR1 transcription. In all but one case, the sites are redundant. To test whether these sites actually participate in CAR1 expression, each class of sites was inactivated by substitution mutations that retained the native spacing of the CAR1 cis-actin

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Nash, Austin L., Alexandra H. M. Jebb, and Daniel T. Blumstein. "Is the propensity to emit alarm calls associated with health status?" Current Zoology 66, no. 6 (2020): 607–14. http://dx.doi.org/10.1093/cz/zoaa020.

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Abstract The production and structure of animal signals may depend on an individual’s health status and may provide more than one type of information to receivers. While alarm calls are not typically viewed as health condition dependent, recent studies have suggested that their structure, and possibly their propensity to be emitted, depends on an individual’s health condition and state. We asked whether the propensity of yellow-bellied marmots (Marmota flaviventer) to emit calls is influenced by their immunological or parasite status, by quantifying both trap-elicited and natural calling rates

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