1,561 research outputs found

    Science Fiction Double Feature: Trans Liberation on Twin Earth

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    What is it to be a woman? What is it to be a man? We start by laying out desiderata for an analysis of 'woman' and 'man': descriptively, it should link these gender categories to sex biology without reducing them to sex biology, and politically, it should help us explain and combat traditional sexism while also allowing us to make sense of the activist view that gendering should be consensual. Using a Putnam-style 'Twin Earth' example, we argue that none of the existing analyses in the feminist literature succeeds in meeting all of our desiderata. Finally, we propose a positive account that we believe can satisfy all the desiderata outlined. According to our theory, the genders 'woman' and 'man' are individuated not by their contemporary connections to sex biology, but by their historical continuity with classes that were originally closely connected to sex biology

    Inanimate Life

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    Inanimate Life is an open textbook covering a very traditional biological topic, botany, in a non-traditional way. Rather than a phylogenetic approach, going group by group, the book considers what defines organisms and examines four general areas of their biology: structure (their composition and how it comes to be), reproduction (including sex), energy and material needs, and their interactions with conditions and with other organisms. Although much of the text is devoted to vascular plants, the book comparatively considers ‘EBA = everything but animals’ (hence the title): plants, photosynthetic organisms that are not plants (‘algae’, as well as some bacteria and archaebacteria), fungi, and ‘fungal-like’ organisms. The book includes brief ‘fact sheets’ of over fifty organisms/groups that biologists should be aware of, ranging from the very familiar (corn, yeast) to the unfamiliar (bracket fungi, late-blight of potato). These groups reflect the diversity of inanimate life.https://knightscholar.geneseo.edu/oer-ost/1022/thumbnail.jp

    Alien Registration- Briggs, George (Old Town, Penobscot County)

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    https://digitalmaine.com/alien_docs/7348/thumbnail.jp

    A public health department in a community without Medicaid ; organizational response to multi-functional responsibility

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    Public health care institutions and especially public health agencies have been the focus of concern and consternation. The organizational development of the Department of Health Services in Maricopa County, Arizona, is described in which the Division of Public Health assumed broad responsibilities in the provision of primary care services. Both the organizational structure and the management system developed to support it have allowed the Division to maintain responsiveness, flexibility, and accountability in meeting its multiple functional responsibilitie

    Alien Registration- Briggs, George W. (Stockholm, Aroostook County)

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    https://digitalmaine.com/alien_docs/33373/thumbnail.jp

    The Changing Voice

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    Quantum sensors based on weak-value amplification cannot overcome decoherence

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    Sensors that harness exclusively quantum phenomena (such as entanglement) can achieve superior performance compared to those employing only classical principles. Recently, a technique based on postselected, weakly-performed measurements has emerged as a method of overcoming technical noise in the detection and estimation of small interaction parameters, particularly in optical systems. The question of which other types of noise may be combatted remains open. We here analyze whether the effect can overcome decoherence in a typical field sensing scenario. Benchmarking a weak, postselected measurement strategy against a strong, direct strategy we conclude that no advantage is achievable, and that even a small amount of decoherence proves catastrophic to the weak-value amplification technique.Comment: Published version with improvements to presentation, including clarifying our understanding of technical noise and quantum nois

    Bronchopulmonary dysplasia in a premature infant case report and literature review

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    Bronchopulmonary dysplasia is an important cause of morbidity and mortality in premature infants. The aim of this study is to present a premature, extremely low birth weight infant with bronchopulmonary dysplasia. A reviewof the case records of a child with recurrent respiratory distress and the relevant literature. A preterm, extremely low birth weight baby (birth weight was 0.8 Kg), delivered by emergency caesarian section for previous caesarian section and prolonged rupture of fetal membranes at 27 weeks gestational age. She had spontaneous breathing at birth (APGAR scores were 8 in one minute and 10 in 5 minutes). She developed respiratory distress with cyanosis and became oxygen dependent from the second week of life. Examination revealed severe dyspnoea with grunting respiration, tachypnoea, cyanosis and crackles in the lung fields. Chest X-ray showed hyper inf lat ion, r ight lower zone patchy consolidation with obliteration of the costophrenic angle. Echocardiography was however normal. She was successively managed with intermittent oxygen, dexamethasone, salbutamol and antibiotics (ceftriaxone). She was nursed in the incubator for 3 months. There was no episode of apneic attack throughout admission. She responded to treatment and was discharged home on intermittent oxygen therapy and nebulisation. The weight on discharge was 1.6kg. At 6 months of age, she is still having recurrent respiratory distress and supplemental oxygen at home. She is regular to follow up with recurrent episodes of wheeze requiring admissions. Bronchopulmonary dysplasia should be suspected in a premature extremely low birth weight infant with early recurrent respiratory distress.Key words: Bronchopulmonary dysplasia, prematurity, extreme lowbirth weight

    Seeing opportunity in every difficulty: protecting information with weak value techniques

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    A weak value is an effective description of the influence of a pre and post-selected 'principal' system on another 'meter' system to which it is weakly coupled. Weak values can describe anomalously large deflections of the meter, and deflections in otherwise unperturbed variables: this motivates investigation of the potential benefits of the protocol in precision metrology. We present a visual interpretation of weak value experiments in phase space, enabling an evaluation of the effects of three types of detector noise as 'Fisher information efficiency' functions. These functions depend on the marginal distribution of the Wigner function of the meter, and give a unified view of the weak value protocol as a way of protecting Fisher information from detector imperfections. This approach explains why weak value techniques are more effective for avoiding detector saturation than for mitigating detector jitter or pixelation.Comment: 17 pp, 4 figs, Quantum Stud.: Math. Found. (2018

    Airborne Radar for sUAS Sense and Avoid

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    A primary challenge for the safe integration of small UAS operations into the National Airspace System (NAS) is traffic deconfliction, both from manned and unmanned aircraft. The UAS Traffic Management (UTM) project being conducted at the National Aeronautics and Space Administration (NASA) considers a layered approach to separation provision, ranging from segregation of operations through airspace volumes (geofences) to autonomous sense and avoid (SAA) technologies for higher risk, densely occupied airspace. Cooperative SAA systems, such as Automatic Dependent Surveillance-Broadcast (ADS-B) and/or vehicle-to-vehicle communication systems provide significant additional risk mitigation but they fail to adequately mitigate collision risks for non-cooperative (non-transponder equipped) airborne aircraft. The RAAVIN (Radar on Autonomous Aircraft to Verify ICAROUS Navigation) flight test being conducted by NASA and the Mid-Atlantic Aviation Partnership (MAAP) was designed to investigate the applicability and performance of a prototype, commercially available sUAS radar to detect and track non-cooperative airborne traffic, both manned and unmanned. The radar selected for this research was a Frequency Modulated Continuous Wave (FMCW) radar with 120 degree azimuth and 80 degree elevation field of view operating at 24.55GHz center frequency with a 200 MHz bandwidth. The radar transmits 2 watts of power thru a Metamaterial Electronically Scanning Array antenna in horizontal polarization. When the radar is transmitting, personnel must be at least 1 meter away from the active array to limit nonionizing radiation exposure. The radar physical dimensions are 18.7cm by 12.1cm by 4.1cm and it weighs less than 820 grams making it well suited for installation on small UASs. The onboard, SAA capability, known as ICAROUS, (Independent Configurable Architecture for Reliable Operations of Unmanned Systems), developed by NASA to support sUAS operations, will provide autonomous guidance using the traffic radar tracks from the onboard radar. The RAAVIN set of studies will be conducted in three phases. The first phase included outdoor, ground-based radar evaluations performed at the Virginia Techs Kentland Farm testing range in Blacksburg, VA. The test was designed to measure how well the radar could detect and track a small UAS flying in the radars field of view. The radar was used to monitor 5 test flights consisting of outbound, inbound and crossing routes at different ranges and altitudes. The UAS flown during the ground test was the Inspire 2, a quad copter weighing less than 4250 grams (10 pounds) at maximum payload. The radar was set up to scan and track targets over its full azimuthal field of view from 0 to 40 degrees in elevation. The radar was configured to eliminate tracks generated from any targets located beyond 2000 meters from the radar and moving at velocities under 1.45 meters per second. For subsequent phases of the study the radar will be integrated with a sUAS platform to evaluate its performance in flight for SAA applications ranging from sUAS to manned GA aircraft detections and tracking. Preliminary data analysis from the first outdoor ground tests showed the radar performed well at tracking the vehicle as it flew outbound and repeatedly maintained a track out to 1000 meters (maximum 1387 meters) until the vehicle slowed to a stop to reverse direction to fly inbound. As the Inspire flew inbound tracks from beyond 800 meters, a reacquisition time delay was consistently observed between when the Inspire exceeds a speed of 1.45 meters per second and when the radar indicated an inbound target was present and maintained its track. The time delay varied between 6 seconds to over 37 seconds for the inbound flights examined, and typically resulted in about a 200 meter closure distance before the Inspire track was maintained. The radar performed well at both acquiring and tracking the vehicle as it flew crossing routes out past 400 meters across the azimuthal field of view. The radar and ICAROUS software will be integrated and flown on a BFD-1400-SE8-E UAS during the next phase of the RAAVIN project. The main goal at the conclusion of this effort is to determine if this radar technology can reliably support minimum requirements for SAA applications of sUAS. In particular, the study will measure the range of vehicle detections, lateral and vertical angular errors, false and missed/late detections, and estimated distance at closest point of approach after an avoidance maneuver is executed. This last metric is directly impacted by sensor performance and indicates its suitability for the task
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