Length-frequency estimation for yellowfin tuna (Thunnus albacares) caught by commercial fishing gear in the Eastern Pacific Ocean

ENGLISH: Methods of collecting samples for the purpose of estimating the numbers and weights of fish caught, by length interval, are described. Several models for two-stage sampling are described, and the equations for the estimators and their variances are given. The results from a brief simulation study are used to show the differences between estimates made with the different models. Estimators for the average weights of fish in the catch and their variances are also described. These average weights are used to provide improved estimates of the total annual catches of yellowfin taken from the eastern Pacific Ocean, east of 150°W, between 1955 and 1990. SPANISH: Se describen los métodos de recoger de muestreo para estimar el número o peso de peces capturados, por intervalo de talla. Se describen varios modelos para el muestreo de dos etapas, y se presentan las ecuaciones para los estimadores y sus varianzas. Se usan los resultados de un breve estudio de simulación para indicar las diferencias entre estimaciones realizadas con los distintosmodelos. También se describe un estimador para el peso promedio de peces en la captura y su varianza. Se usan estos estimadores para calcular estimaciones mejoradas de las capturas anuales totales de aleta amarilla tomadas del Océano Pacífico oriental, al este de 150°W, entre 1955 y 1990. (PDF contains 41 pages.

1942-10-27, Norris to Parents

This collection contains seven correspondence from 2ndLt. Norris K. Calkins, USAAF to his parents during the Second World War. Also included are ten correspondence to his parents in regards to his missing in action and subsequent killing in action status. Ephemera from his father Norris R. Calkins from the First World War is also included.https://digitalcommons.chapman.edu/nkcalkins_correspondence_from/1002/thumbnail.jp

1943-05-13, Norris to Parents

This collection contains seven correspondence from 2ndLt. Norris K. Calkins, USAAF to his parents during the Second World War. Also included are ten correspondence to his parents in regards to his missing in action and subsequent killing in action status. Ephemera from his father Norris R. Calkins from the First World War is also included.https://digitalcommons.chapman.edu/nkcalkins_correspondence_from/1006/thumbnail.jp

1943-03-13, Norris to Parents

This collection contains seven correspondence from 2ndLt. Norris K. Calkins, USAAF to his parents during the Second World War. Also included are ten correspondence to his parents in regards to his missing in action and subsequent killing in action status. Ephemera from his father Norris R. Calkins from the First World War is also included.https://digitalcommons.chapman.edu/nkcalkins_correspondence_from/1003/thumbnail.jp

1943-05-05, Norris to Parents

This collection contains seven correspondence from 2ndLt. Norris K. Calkins, USAAF to his parents during the Second World War. Also included are ten correspondence to his parents in regards to his missing in action and subsequent killing in action status. Ephemera from his father Norris R. Calkins from the First World War is also included.https://digitalcommons.chapman.edu/nkcalkins_correspondence_from/1004/thumbnail.jp

1943-05-10, Norris to Mother

This collection contains seven correspondence from 2ndLt. Norris K. Calkins, USAAF to his parents during the Second World War. Also included are ten correspondence to his parents in regards to his missing in action and subsequent killing in action status. Ephemera from his father Norris R. Calkins from the First World War is also included.https://digitalcommons.chapman.edu/nkcalkins_correspondence_from/1005/thumbnail.jp

1942-06-17, Norris to Father

This collection contains seven correspondence from 2ndLt. Norris K. Calkins, USAAF to his parents during the Second World War. Also included are ten correspondence to his parents in regards to his missing in action and subsequent killing in action status. Ephemera from his father Norris R. Calkins from the First World War is also included.https://digitalcommons.chapman.edu/nkcalkins_correspondence_from/1001/thumbnail.jp

1942-05-10, Norris to Mother

This collection contains seven correspondence from 2ndLt. Norris K. Calkins, USAAF to his parents during the Second World War. Also included are ten correspondence to his parents in regards to his missing in action and subsequent killing in action status. Ephemera from his father Norris R. Calkins from the First World War is also included.https://digitalcommons.chapman.edu/nkcalkins_correspondence_from/1000/thumbnail.jp

A Multiscale Dynamo Model Driven by Quasi-geostrophic Convection

A convection-driven multiscale dynamo model is developed in the limit of low Rossby number for the plane layer geometry in which the gravity and rotation vectors are aligned. The small-scale fluctuating dynamics are described by a magnetically-modified quasi-geostrophic equation set, and the large-scale mean dynamics are governed by a diagnostic thermal wind balance. The model utilizes three timescales that respectively characterize the convective timescale, the large-scale magnetic evolution timescale, and the large-scale thermal evolution timescale. Distinct equations are derived for the cases of order one and low magnetic Prandtl number. It is shown that the low magnetic Prandtl number model is characterized by a magnetic to kinetic energy ratio that is asymptotically large, with ohmic dissipation dominating viscous dissipation on the large-scales. For the order one magnetic Prandtl number model the magnetic and kinetic energies are equipartitioned and both ohmic and viscous dissipation are weak on the large-scales; large-scale ohmic dissipation occurs in thin magnetic boundary layers adjacent to the horizontal boundaries. For both magnetic Prandtl number cases the Elsasser number is small since the Lorentz force does not enter the leading order force balance. The new models can be considered fully nonlinear, generalized versions of the dynamo model originally developed by Childress and Soward [Phys. Rev. Lett., 29, p.837, 1972], and provide a new theoretical framework for understanding the dynamics of convection-driven dynamos in regimes that are only just becoming accessible to direct numerical simulations

An exploration of occupation in nursing home residents with dementia

Objectives: This study evaluated the sitting room environment of two nursing homes in Ireland, using interactive occupation and social engagement as outcome measures and defining these rooms as occupational spaces. Method: Snapshot observational recordings were made in the main sitting rooms during the periods of time when the rooms were in most active use. Narrative information was also recorded. Results: Residents were more likely to occupy their time in the main sitting room passively, rather than in interactive occupation and social engagement. The nursing home residents with dementia spent approximately 70% of their daily time in the main sitting room areas in states of occupational disengagement. Discussion: Additional insight is provided through pragmatic narrative descriptions of the functioning of the main sitting room environment in terms of interactive occupation and social engagement. Relevance: The research study demonstrates a methodology for evaluating the sitting room areas of a care environment, using interactive occupation and social engagement as outcome measures,which can be used for descriptive and comparative insights into the performance of care environments