Receipt, 9 December 1871

https://egrove.olemiss.edu/aldrichdocs/1069/thumbnail.jp

Fiber Coil Resonator for Optical Gain

We have developed a cheap design for a device using 3D printed parts and simple motors to fabricate a rare earth metal doped fiber coil amplifier. We also have measurements for bending losses in a small coil and absorption of the solar spectrum in an EDFA. This research will result in the creation of a design researchers can download, 3D print, and assemble to create their own fiber coils to whatever specifications are needed. These fabricated optical devices can be used for military laser defense systems, optical concentration such as solar concentrators, microfiber resonator coils or fiber coil gyroscopes. A rare earth metal doped fiber will be tightly wrapped around an acrylic tube with no gap between rings of the coil so that when the rings are epoxied together with a similar refractive index epoxy and removed from the glass tube, it creates an effective cylinder. Because this fiber is wrapped around in many windings, a long path is created for the signal wavelength to be amplified through while the device itself is compact enough to be portable and implemented in smaller areas. This will allow for very large gain in a device that is structured to take up little space in a small volume as opposed to a cumbersome great length in a fiber many meters long

Prime ideals and the ideal-radical of a distributively generated near-ring

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/46292/1/209_2005_Article_BF01111100.pd

Tachycardia-bradycardia syndrome: Electrophysiological mechanisms and future therapeutic approaches (Review)

Sick sinus syndrome (SSS) encompasses a group of disorders whereby the heart is unable to perform its pacemaker function, due to genetic and acquired causes. Tachycardia‑bradycardia syndrome (TBS) is a complication of SSS characterized by alternating tachycardia and bradycardia. Techniques such as genetic screening and molecular diagnostics together with the use of pre-clinical models have elucidated the electrophysiological mechanisms of this condition. Dysfunction of ion channels responsible for initiation or conduction of cardiac action potentials may underlie both bradycardia and tachycardia; bradycardia can also increase the risk of tachycardia, and vice versa. The mainstay treatment option for SSS is pacemaker implantation, an effective approach, but has disadvantages such as infection, limited battery life, dislodgement of leads and catheters to be permanently implanted in situ. Alternatives to electronic pacemakers are gene‑based bio‑artificial sinoatrial node and cell‑based bio‑artificial pacemakers, which are promising techniques whose long-term safety and efficacy need to be established. The aim of this article is to review the different ion channels involved in TBS, examine the three‑way relationship between ion channel dysfunction, tachycardia and bradycardia in TBS and to consider its current and future therapies.GT was supported by the BBSRC and YC is supported by the ESRC for their PhD studies. GT is grateful to the Croucher Foundation of Hong Kong for supporting his clinical assistant professorship

Spatiotemporal variation in harbor porpoise distribution and foraging across a landscape of fear

Funding information: Marine Alliance for Science and Technology for Scotland; Marine Scotland Science; University of AberdeenPeer reviewedPublisher PD

Comparing distribution of harbour porpoise using Generalized Additive Models and hierarchical Bayesian models with Integrated Nested Laplace Approximation

Open Access via Elsevier agreement Acknowledgments We thank colleagues at the University of Aberdeen, Moray First Marine, NERI, Hi-Def Aerial Surveying Ltd and Ravenair for essential support in the field, particularly Tim Barton, Bill Ruck, Rasmus Nielson and Dave Rutter. L.D.W. was supported by the Marine Alliance for Science and Technology for Scotland (MASTS), the University of Aberdeen and Marine Scotland Science. Collaboration between the University of Aberdeen and Marine Scotland was supported by the Marine Collaboration Research Forum (MarCRF). Digital aerial surveys in 2010 were funded by Moray Offshore Renewables Ltd and 2014 by Marine Scotland. Additional funding for analysis of the combined datasets was provided by Marine Scotland. Collaboration between the University of Aberdeen and Marine Scotland was supported by MarCRF.Peer reviewedPublisher PD

Balancing structural complexity with ecological insight in Spatio‐temporal species distribution models

1. The potential for statistical complexity in species distribution models (SDMs) has greatly increased with advances in computational power. Structurally complex models provide the flexibility to analyse intricate ecological systems and realistically messy data, but can be difficult to interpret, reducing their practical impact. Founding model complexity in ecological theory can improve insightgained from SDMs. 2. Here, we evaluate a marked point process approach, which uses multiple Gaussian random fields to represent population dynamics of the Eurasian crane Grus grus in a spatio-temporal species distribution model. We discuss the role of model components and their impacts on predictions, in comparison with a simpler binomial presence/absence approach. Inference is carried out using Integrated Nested Laplace Approximation (INLA) with inlabru, an accessible and computationally efficient approach for Bayesian hierarchical modelling, which is not yet widely used in SDMs. 3. Using the marked point process approach, crane distribution was predicted to be dependent on the density of suitable habitat patches, as well as close to observations of the existing population. This demonstrates the advantage of complex model components in accounting for spatio-temporal population dynamics (such as habitat preferences and dispersal limitations) that are not explained by environmental variables. However, including an AR1 temporal correlation structure in the models resulted in unrealistic predictions of species distribution; highlighting the need for careful consideration when determining the level of model complexity. 4. Increasing model complexity, with careful evaluation of the effects of additional model components, can provide a more realistic representation of a system, which is of particular importance for a practical and impact-focused discipline such as ecology (though these methods extend to applications for a wide range of systems). Founding complexity in contextual theory is not only fundamental to maintaining model interpretability but can be a useful approach to improving insight gained from model outputs

Balancing structural complexity with ecological insight in Spatio‐temporal species distribution models

1. The potential for statistical complexity in species distribution models (SDMs) has greatly increased with advances in computational power. Structurally complex models provide the flexibility to analyse intricate ecological systems and realistically messy data, but can be difficult to interpret, reducing their practical impact. Founding model complexity in ecological theory can improve insightgained from SDMs. 2. Here, we evaluate a marked point process approach, which uses multiple Gaussian random fields to represent population dynamics of the Eurasian crane Grus grus in a spatio-temporal species distribution model. We discuss the role of model components and their impacts on predictions, in comparison with a simpler binomial presence/absence approach. Inference is carried out using Integrated Nested Laplace Approximation (INLA) with inlabru, an accessible and computationally efficient approach for Bayesian hierarchical modelling, which is not yet widely used in SDMs. 3. Using the marked point process approach, crane distribution was predicted to be dependent on the density of suitable habitat patches, as well as close to observations of the existing population. This demonstrates the advantage of complex model components in accounting for spatio-temporal population dynamics (such as habitat preferences and dispersal limitations) that are not explained by environmental variables. However, including an AR1 temporal correlation structure in the models resulted in unrealistic predictions of species distribution; highlighting the need for careful consideration when determining the level of model complexity. 4. Increasing model complexity, with careful evaluation of the effects of additional model components, can provide a more realistic representation of a system, which is of particular importance for a practical and impact-focused discipline such as ecology (though these methods extend to applications for a wide range of systems). Founding complexity in contextual theory is not only fundamental to maintaining model interpretability but can be a useful approach to improving insight gained from model outputs

Word processing as an act of collaboration: description of a media artwork

As described in an earlier contribution to the JMP (Photography as an act of collaboration - Vol 15, Issue 3), my research explores the possibilities and implications of treating the camera and the photographic process as an active collaborator in the creation of scenes, events and ‘moments’ that did not exist until brought into being by the act of photographing them. The media artwork described here is the result of an experiment to explore the possibility of establishing a similarly collaborative relationship with the ‘agency’ of word-processing software that I have endeavoured to establish with the medium of photography. Despite comprehensively stripping the original text of both sense and sequence, the resulting text not only retains an uncanny degree of consistency with both the style and meaning of the original, but also reveals insights which had been only latent within the original. The result would appear to reinforce the findings of my previous research in photographic practice: that, by giving up conscious, rational control over the means of expression, we can (sometimes) create the conditions necessary for a constructive and often illuminating dialogue with the deus ex machina