109 research outputs found
Preparing narrow velocity distributions for quantum memories in room-temperature alkali-metal vapors
No full textQuantum memories are a crucial technology for enabling large-scale quantum networks through synchronization of probabilistic operations. Such networks impose strict requirements on quantum memory, such as storage time, retrieval efficiency, bandwidth, and scalability. On- and off-resonant ladder protocols on warm atomic vapor platforms are promising candidates, combining efficient high-bandwidth operation with low-noise on-demand retrieval. However, their storage time is severely limited by motion-induced dephasing caused by the broad velocity distribution of atoms composing the vapor. In this paper, we demonstrate velocity selective optical pumping to overcome this decoherence mechanism. This will increase the achievable memory storage time of vapor memories. This technique can also be used for preparing arbitrarily shaped absorption profiles, for instance, preparing an atomic frequency comb absorption feature
Raman quantum memory with built-in suppression of four-wave-mixing noise
No full textQuantum memories are essential for large-scale quantum information networks. Along with high efficiency, storage lifetime, and optical bandwidth, it is critical that the memory adds negligible noise to the recalled signal. A common source of noise in optical quantum memories is spontaneous four-wave mixing. We develop and implement a technically simple scheme to suppress this noise mechanism by means of quantum interference. Using this scheme with a Raman memory in warm atomic vapor, we demonstrate over an order of magnitude improvement in noise performance. Furthermore we demonstrate a method to quantify the remaining noise contributions and present a route to enable further noise suppression. Our scheme opens the way to quantum demonstrations using a broadband memory, significantly advancing the search for scalable quantum photonic networks
Don\u27t Forget the Smallest Creatures and Get Rebugging
No full textVicki Hird, author of Rebugging the Planet: The Remarkable Things that Insects (and Other Invertebrates) Do – And Why We Need to Love Them More, will be talking about how we can avoid \u27insectageddon\u27, and help the invertebrates to survive and thrive in so many ways. Her book talks of their importance - from food to waste disposal and from culture to clothes - and why they are at risk. Climate change, habitat loss, and pollution in many forms are a big part of the problem. Rebugging our attitudes will be a good start, helping those around us understand the role and importance of all the invertebrates. Gardening and supporting local green spaces to be bug friendly will be critical and she will explore how to go further in what you eat, the clothes you buy and how you act politically locally and nationally. These can all make a huge difference too to the invertebrates. You may be inspired and find the bugs beautiful... Come with questions, leave with a new plan to rebug your life. See www.rebuggingtheplanet.orghttps://scholarworks.boisestate.edu/ideas_of_nature_gallery/1032/thumbnail.jp
Don\u27t Forget the Smallest Creatures and Get Rebugging (Lecture)
No full textVicki Hird, author of Rebugging the Planet: The Remarkable Things that Insects (and Other Invertebrates) Do – And Why We Need to Love Them More, will be talking about how we can avoid \u27insectageddon\u27, and help the invertebrates to survive and thrive in so many ways. Her book talks of their importance - from food to waste disposal and from culture to clothes - and why they are at risk. Climate change, habitat loss, and pollution in many forms are a big part of the problem. Rebugging our attitudes will be a good start, helping those around us understand the role and importance of all the invertebrates. Gardening and supporting local green spaces to be bug friendly will be critical and she will explore how to go further in what you eat, the clothes you buy and how you act politically locally and nationally. These can all make a huge difference too to the invertebrates. You may be inspired and find the bugs beautiful... Come with questions, leave with a new plan to rebug your life. See www.rebuggingtheplanet.or
Don\u27t Forget the Smallest Creatures and Get Rebugging (Flyer)
No full textVicki Hird, author of Rebugging the Planet: The Remarkable Things that Insects (and Other Invertebrates) Do – And Why We Need to Love Them More, will be talking about how we can avoid \u27insectageddon\u27, and help the invertebrates to survive and thrive in so many ways. Her book talks of their importance - from food to waste disposal and from culture to clothes - and why they are at risk. Climate change, habitat loss, and pollution in many forms are a big part of the problem. Rebugging our attitudes will be a good start, helping those around us understand the role and importance of all the invertebrates. Gardening and supporting local green spaces to be bug friendly will be critical and she will explore how to go further in what you eat, the clothes you buy and how you act politically locally and nationally. These can all make a huge difference too to the invertebrates. You may be inspired and find the bugs beautiful... Come with questions, leave with a new plan to rebug your life. See www.rebuggingtheplanet.or
Taxonomy, phylogenetic and biogeographical relationships of African grassland Francolins (Genus: Scleroptila)
No full textBibliography: leaves 23-28.The potential for using a combination of molecular and whole-organismal data has opened up new avenues for avian taxonomy, phylogenetics and biogeography. Such a multifaceted approach is used here to identify diagnosable taxa within the Orange River Francolin Scleroptila levaillanloides species complex and resolve evolutionary relationships between these taxa and other mono-and polytypic forms within the Red-winged Group of francolins (= genus Scleroplila sensli lalo). Mitochondrial cytochrome-b DNA sequence data (±250 b.p.) from 50 individuals and 19 morphological characters extracted from reports in published literature were employed to achieve these aims. These characters were analysed separately and also in combination using maximum parsimony (DNA sequences and organismal data), maximum likelihood (DNA sequences) and distance (DNA sequences) analyses. Monophyly of the Red-winged Group plus the Ring-necked Francolin Dendroperdix slreptophorus was supported by all the analyses (bootstrap support ranged from 50%-94%) except distance analysis. The Orange River Francolin complex was found to be non-monophyletic. Two distinct clades were identified, one comprising taxa from southwestern and the other from northeastern Africa. Morphological analysis yielded a distinct clade of the southwestern Orange River Francolin. The other polytypic species and assemblages thereof show poor resolution. The results of this study clearly demonstrate a need for further assessment of the taxonomic status of Scleroptila spp. and their phylogenetic relationships
Patterns of uterine prolapse in dairy cows and prognosis after treatment
No full textIn a 12-month study undertaken in a 9-veterinarian dairy practice of 220 000 cows in 340 herds, 200 (0.9%) developed prolapses mostly (155/169 with data) in the first 24 h after calving. Most cows (130/200) had prolapses during autumn and winter months, and assistance was required in 47 of 200 calvings that resulted in prolapses. Treatment of 196 affected cows consisted of cleansing and replacement of the uterus, insertion of perivulvar retention sutures, local and systemic administration of antibiotics, and parenteral administration of dexamethasone and oxytocin. Calcium was administered to cows with milk fever (117) and to multiparous cows without milk fever attended by veterinarian (8). Crude recovery rate after 2 weeks was 72.4%, but recovery was significantly better if the calf was born alive, the cows was primiparous, the cow did not have stage-3 milk fever, or if the cow was attended by veterinarian. Time to treatment was not significantly associated with recovery, but affected cows were treated mostly (127/156) within 2 h of occurrence of the prolapse. By multivariable analysis, presence of a liveborn calf, parity and lack of stage-3 milk fever, but not attending veterinarian, were significant prognostic indicators of 2-week survival.ID: 6633; Accession Number: 19902214323. Publication Type: Journal Article. Language: English. Number of References: 8 ref. Registry Number: 7440-70-2, 50-02-2, 55812-90-3, 2265-67-7, 1879-72-7, 312-93-6, 1926-94-9, 16978-57-7, 2392-39-4, 7743-96-6, 50-56-6. Subject Subsets: Veterinary Science; Veterinary Scienc
Patterns and determinants of rectal prolapse in a herd of pigs
No full textA prospective cohort study was designed to describe the patterns and to determine the factors associated with the risk of rectal prolapse in a commercial swine herd in California, USA. Thirty (1.0%) of 2862 pigs prolapsed between 12 and 28 weeks of age with the peak incidence occurring in 14- to 16-week-old pigs. The overall prolapse rate was 9.1 cases per 100 000 days at risk. Prolapse rates were highest during the winter and autumn months. Other factors associated with an increased risk of prolapse were maleness (relative risk 2.3), birth weight less than 1000 g (relative risk 3.4), Yorkshire boar A (relative risk 2.8) and dams of litter number 1 (relative risk 14.9), 2 (relative risk 8.2) and 3 (relative risk 9.8). No evidence was found to support the hypotheses that diarrhoea and coughing are factors associated with a risk of prolapse
How do migrants become Canadian citizens?
No full textThe second edition of "Questioning Sociology: Canadian Perspectives" offers a collection of twenty-three readings that encourage students to challenge commonplace assumptions and to reflect critically on the social world they inhabit. Contributed by prominent Canadian scholars, these readings explore provocative sociological questions and are designed to lead students into debates about key social and theoretical topics. Also covering a number of important Canadian issues, including sovereignty for Quebec and Indigenous peoples, maritime economic transition, and immigration and citizenship, this text prompts students to engage thoughtfully with issues that are relevant to their lives. In doing so, it encourages readers to develop a critical 'sociological imagination'. This edition features new chapters on family, mental illness, the environment, women in prison, media, and 'deserted questions' in sociology. Covering a range of important sociological topics and offering highly accessible pedagogy, this text is ideal for students who are new to the study of sociology
Ethical dilemmas: a student reflection on safeguarding in adult domestic abuse
No full textThis reflective account discusses a case where a patient refused a safeguarding referral after disclosing domestic abuse to a student paramedic on an MSc programme. The author examines the medical, ethical and legal evidence when determining whether the right path was taken in caring for this patient. It is argued that the care delivered was lawful and ethical but the student paramedic did not have sufficient awareness of the support options available to those experiencing domestic abuse. Their oversimplification of the dilemma to the patient having capacity to refuse referral omitted key aspects of the medico-legal framework, potentially to the detriment of the patient's care. Reflective learning has allowed the author to recognise the limits of his understanding of the complex medico-ethico-legal framework surrounding domestic abuse, consent, coercion and controlling behaviour. In response, he has established a new methodology to assess the underlying reasons for refusing a safeguarding referral
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