A. Chadwick

Searching for Ariel’s Aliens with the CRISPI (Compositional Regolith and Icy Surface analysis via Particle Impact) Mass Spectrometer SmallSat Flyby Mission

Zach Ulibarri, Saima Jamal, Ashin Alex, Lucas Arzoumanian et autres

CRISPI (Compositional Regolith and Icy Surface analysis via Particle Impact) is a proposed ridealong in-situ mass spectrometer (MS) smallsat mission to provide synergistic astrobiology science at Ariel to the Uranus Orbiter and Probe (UOP) mission. By utilizing a high-resolution impact ionization MS …

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High-Torque Momentum Control for Spacecraft Docking Dynamics

A. Chadwick, Mason A. Peck

The increasing need for refueling and servicing of on-orbit spacecraft motivates a fresh look at the dynamic behaviors of interconnected spacecraft. The sudden changes in attitude dynamics during connection events demand high-torque actuation, ideally through power-efficient momentum-control systems. This study examines the …

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Electric Vertical Take-Off and Landing (eVTOL) Vehicle Reliability and Safety Analysis

Karla Raigoza, A. Chadwick, Chiranth Kishore

Abstract With the expansion of cosmopolitan areas resulting in an increase of traffic and overcrowding came the creation of the urban air mobility (UAM) market. One technology that has been growing swiftly within the UAM market in the last decade is that …

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59 Orcadian Rhythm of Corticosterone, Prolactin and Thyroid Hormones in Serum and Endocrine Glands of Post-hatch Chicks, Incubated at Different Temperatures

E.R. K�hn, E. Decuypere, L.M. COLEN, A. Chadwick et autres

Relationship between Hypothalamic Serotoninergic Activity and Prolactin and Growth Hormone Secretion in the Domestic Cockerel

Terence R. Hall, Stephen A K Harvey, A. Chadwick

Cockerels were injected with drugs which affect brain serotoninergic activity. Concentrations of plasma prolactin and growth hormone have been measured and correlated with hypothalamic serotonin and 5-hydroxyindole acetic acid (5HIAA) levels. Tryptophan concentrations in the brain and the activity of monoamine oxidase …

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The Effect of Thyrotropin-Releasing Hormone (TRH) and Somatostatin (GHRIH) on Growth Hormone and Prolactin Secretion in vitro and in vivo in the Domestic Fowl (Gallus domesticus)

Steve Harvey, Colin Guy Scanes, A. Chadwick, Nicholas J. Bolton

The effects of thyrotropin-releasing hormone (TRH) on growth hormone (GH) and prolactin (Prl) secretion have been investigated in vitro and in vivo in domestic fowl. In both conscious and anaesthetized immature chickens the administration (i.v.) of TRH (2.5 and 25 microgram/kg) significantly …

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Influence of Nest Deprivation on Behaviour, Hormonal Concentrations and on the Ability to Resume Incubation in Domestic Hens (Gallus domesticus)

Gérard Leboucher, Marie‐Annick Richard‐Yris, A. Chadwick, Daniel D. Guemene

Abstract In this study, we investigated the influence of the length of nest deprivation period (3 vs. 6 d) on the ability to renest of incubating hens. We focused on the hens' behaviour, particularly on nesting and calls, on their prolactin, luteinizing …

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Influence of the Presence of Chicks on the Ability to Resume Incubation Behavior in Domestic Hens (Gallus domesticus)

Marie‐Annick Richard‐Yris, A. Chadwick, Daniel D. Guemene, Huguette Grillou-Schuelke et autres

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Respective effects of chicks and nest on behavior and hormonal concentrations of incubating domestic hens

Gérard Leboucher, Marie‐Annick Richard‐Yris, Daniel D. Guemene, A. Chadwick

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Maternal behaviour in domestic hens: does previous incubating and maternal experience influence maternal responsiveness?

G. Leboucher, Marie‐Annick Richard‐Yris, John Williams, A. Chadwick

The experiments presented here were designed to investigate the influence of previous incubating and maternal experience on maternal responsiveness of the hen. During the first experiment, newly-hatched chicks were introduced into the nest of 10 incubating hens (Vedette JV 15 strain). These …

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Effect of estrogen on calcium homeostasis and pituitary hormones in the growing chick

Barbara A. Sommerville, Colin Guy Scanes, R. Swaminathan, A. D. Care et autres

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Induction of maternal behavior in incubating and non-incubating hens: Influence of hormones

Marie‐Annick Richard‐Yris, Gérard Leboucher, A. Chadwick, Danielle Hélène Garnier

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