scholarly journals Reducing bias due to noise and attenuation in open-ocean echo integration data

2015 ◽  
Vol 72 (8) ◽  
pp. 2482-2493 ◽  
Author(s):  
Tim E. Ryan ◽  
Ryan A. Downie ◽  
Rudy J. Kloser ◽  
Gordon Keith
Keyword(s):  
Full Range ◽  
Ocean Basin ◽  
Open Ocean ◽  
Weather Extremes ◽  
Processing Efficiency ◽  
Acoustic Data ◽  
Basin Scale ◽  
Backscattering Strength ◽  
Integration Data

Abstract Measurements of mean volume backscattering strength (Sv, dB re 1 m−1) at ocean-basin scale were made using 38-kHz hull-mounted echosounders on ships of opportunity as part of Australia's Integrated Marine Observing System. The data were collected on vessels of various designs, none of which were purposely built for collecting high-quality acoustic data. A full range of weather extremes affected the quality of the data and could cause large biases in Sv. To remove first-order biases and improve processing efficiency, a sequence of new and existing data processing filters were applied in a semi-automated procedure. These filters were designed to mitigate the effects of three types of noise: impulsive (less than one ping), transient (multiple pings), and background (hours or longer). A filter was also applied to identify signals that were attenuated by air bubbles beneath the transducer. These filters were applied to data from transits across the Southwest Pacific, Indian, and Southern Oceans to produce quality-controlled Sv datasets that are now available from a publicly accessible repository. These filters may be relevant to other open-ocean acoustic observing endeavours, and one or more could be used to mitigate bias in data from a range of acoustic applications.

scholarly journals Transport by deep convection in basin-scale geostrophic circulation: turbulence-resolving simulations

2019 ◽  
Vol 865 ◽  
pp. 681-719
Author(s):  
Catherine A. Vreugdenhil ◽  
Bishakhdatta Gayen ◽  
Ross W. Griffiths
Keyword(s):  
Boundary Layer ◽  
Thermal Boundary Layer ◽  
Large Scale ◽  
Deep Convection ◽  
Ocean Basin ◽  
Open Ocean ◽  
Small Scale ◽  
Large Scale Circulation ◽  
Buoyancy Forcing ◽  
Basin Scale

Direct numerical simulations are used to investigate the nature of fully resolved small-scale convection and its role in large-scale circulation in a rotating $f$-plane rectangular basin with imposed surface temperature difference. The large-scale circulation has a horizontal geostrophic component and a deep vertical overturning. This paper focuses on convective circulation with no wind stress, and buoyancy forcing sufficiently strong to ensure turbulent convection within the thermal boundary layer (horizontal Rayleigh numbers $Ra\approx 10^{12}{-}10^{13}$). The dynamics are found to depend on the value of a convective Rossby number, $Ro_{\unicode[STIX]{x0394}T}$, which represents the strength of buoyancy forcing relative to Coriolis forces. Vertical convection shifts from a mean endwall plume under weak rotation ($Ro_{\unicode[STIX]{x0394}T}>10^{-1}$) to ‘open ocean’ chimney convection plus mean vertical plumes at the side boundaries under strong rotation ($Ro_{\unicode[STIX]{x0394}T}<10^{-1}$). The overall heat throughput, horizontal gyre transport and zonally integrated overturning transport are then consistent with scaling predictions for flow constrained by thermal wind balance in the thermal boundary layer coupled to vertical advection–diffusion balance in the boundary layer. For small Rossby numbers relevant to circulation in an ocean basin, vertical heat transport from the surface layer into the deep interior occurs mostly in ‘open ocean’ chimney convection while most vertical mass transport is against the side boundaries. Both heat throughput and the mean circulation (in geostrophic gyres, boundary currents and overturning) are reduced by geostrophic constraints.

scholarly journals Sounding out life in the deep using acoustic data from ships of opportunity

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
K. Haris ◽  
Rudy J. Kloser ◽  
Tim E. Ryan ◽  
Ryan A. Downie ◽  
Gordon Keith ◽  
...  
Keyword(s):  
Ocean Basin ◽  
Commercial Fishing ◽  
Acoustic Data ◽  
Ecosystem Carbon ◽  
Fishing Vessels ◽  
Biogeochemical Models ◽  
Basin Scale ◽  
Total Data ◽  
Spatio Temporal ◽  
New Research

AbstractShedding light on the distribution and ecosystem function of mesopelagic communities in the twilight zone (~200–1000 m depth) of global oceans can bridge the gap in estimates of species biomass, trophic linkages, and carbon sequestration role. Ocean basin-scale bioacoustic data from ships of opportunity programs are increasingly improving this situation by providing spatio-temporal calibrated acoustic snapshots of mesopelagic communities that can mutually complement established global ecosystem, carbon, and biogeochemical models. This data descriptor provides an overview of such bioacoustic data from Australia’s Integrated Marine Observing System (IMOS) Ships of Opportunity (SOOP) Bioacoustics sub-Facility. Until 30 September 2020, more than 600,000 km of data from 22 platforms were processed and made available to a publicly accessible Australian Ocean Data Network (AODN) Portal. Approximately 67% of total data holdings were collected by 13 commercial fishing vessels, fostering collaborations between researchers and ocean industry. IMOS Bioacoustics sub-Facility offers the prospect of acquiring new data, improved insights, and delving into new research challenges for investigating status and trend of mesopelagic ecosystems.

Spatial covariation in survival rates of Northeast Pacific pink salmon (Oncorhynchus gorbuscha)

2001 ◽  
Vol 58 (8) ◽  
pp. 1501-1515 ◽  
Author(s):  
Brian J Pyper ◽  
Franz J Mueter ◽  
Randall M Peterman ◽  
David J Blackbourn ◽  
Chris C Wood
Keyword(s):  
Spatial Scales ◽  
Pink Salmon ◽  
Survival Rates ◽  
Ocean Basin ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Geographical Regions ◽  
Basin Scale ◽  
Stock Recruitment ◽  
Best Fit

We examined spatial patterns of covariation in indices of survival rate (residuals from the best-fit stock- recruitment curve) across four decades among 43 wild pink salmon (Oncorhynchus gorbuscha) stocks from 14 geographical regions in Washington, British Columbia, and Alaska. We found strong evidence of positive covariation among stocks within each region and between certain adjacent regions (e.g., correlations from 0.3 to 0.7) but no evidence of covariation between stocks of distant regions (e.g., separated by 1000 km or more). This suggests that important environmental processes affecting temporal variation in survival rates of pink salmon from spawners to recruits operate at regional spatial scales rather than at the larger ocean basin scale. Based on limited fry abundance data, we found that this covariation in spawner-to-recruit survival rates may be strongly influenced by marine processes.

User Resistance to Health Information Technology

2019 ◽  
pp. 276-287
Author(s):  
Madison N. Ngafeeson
Keyword(s):  
Information Technology ◽  
Healthcare Costs ◽  
Full Range ◽  
Simple Explanation ◽  
It Adoption ◽  
Health It ◽  
User Resistance ◽  
It Implementation ◽  
Great Step

The use of information technology (IT) in healthcare to improve outcomes is now a global phenomenon. If effectively implemented and efficiently leveraged, these technologies will greatly lower healthcare costs, improve safety, and elevate the quality of health. Nevertheless, health IT implementation and adoption continues to meet challenges. Reports show that physicians, nurses, and other healthcare professionals continue to resist health IT. Researchers have proposed models to explain this notion, and till date, there still is a lack of an overarching paradigm to view the concept. Resistance is a complex phenomenon that defies simple explanation and analysis. It requires well-accepted theories or paradigms encompassing the full range of variables associated with it. Understanding and mitigating user resistance is a great step toward improving sector-wide adoption. In this chapter, the authors survey extant theories of resistance and provide a paradigmatic lens for leveraging this knowledge to practical solutions in health IT adoption.

Nursing Turbulence in Critical Care: Relationships With Nursing Workload and Patient Safety

2020 ◽  
Vol 29 (3) ◽  
pp. 182-191
Author(s):  
Jennifer Browne ◽  
Carrie Jo Braden
Keyword(s):  
Critical Care ◽  
Patient Safety ◽  
Quality Of Care ◽  
Full Range ◽  
Operational Definition ◽  
Nursing Workload ◽  
Turbulence Scale ◽  
Safety Risk ◽  
Care Relationships

Background Increased nursing workload can be associated with decreased patient safety and quality of care. The associations between nursing workload, quality of care, and patient safety are not well understood. Objectives The concept of workload and its associated measures do not capture all nursing work activities, and tools used to assess healthy work environments do not identify these activities. The variable turbulence was created to capture nursing activities not represented by workload. The purpose of this research was to specify a definition and preliminary measure for turbulence. Methods A 2-phase exploratory sequential mixed-methods design was used to translate the proposed construct of turbulence into an operational definition and begin preliminary testing of a turbulence scale. Results A member survey of the American Association of Critical-Care Nurses resulted in the identification of 12 turbulence types. Turbulence was defined, and reliability of the turbulence scale was acceptable (α = .75). Turbulence was most strongly correlated with patient safety risk (r = 0.41, n = 293, P &lt; .001). Workload had the weakest association with patient safety risk (r = 0.16, n = 294, P = .005). Conclusions Acknowledging the concepts of turbulence and workload separately best describes the full range of nursing demands. Improved measurement of nursing work is important to advance the science. A clearer understanding of nurses’ work will enhance our ability to target resources and improve patients’ outcomes.

Automation Tool Preparation in the Conditions of Production

2015 ◽  
Vol 770 ◽  
pp. 739-743 ◽  
Author(s):  
A.S. Yuanyushkin ◽  
D.V. Lobanov ◽  
D.A. Rychkov
Keyword(s):  
Comparative Analysis ◽  
Rational Design ◽  
Economic Effect ◽  
Optimal Choice ◽  
Processing Efficiency ◽  
Time Required ◽  
The Given ◽  
High Processing ◽  
Selection Of

The key task of the tool manufacturing is to create or to choose such a type of tool, which would permit to provide high processing efficiency, the best tool`s workability and the quality of the machined surfaces with minimum expenses and resources. The optimal choice of the constructive tool modifications from a variety of options takes much time required for the preparation of the tool to work. To solve this problem, we have developed software that allows you to create, organize and carry out a comparative analysis of structural instruments in order to identify rational option for the given conditions of production. Ordering and selection of a rational design of the instrument is carried out in accordance with established procedures of modeling and comparative analysis of design solutions. Application software can reduce design time technological process by 80...90%, and get a substantial annual economic effect.

scholarly journals A Minimal Metric for the Characterization of Acoustic Noise Emitted by Underwater Vehicles

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6644
Author(s):  
Giacomo Picardi ◽  
Clara Borrelli ◽  
Augusto Sarti ◽  
Giovanni Chimienti ◽  
Marcello Calisti
Keyword(s):  
Acoustic Noise ◽  
Acoustic Emissions ◽  
Remotely Operated Vehicles ◽  
Underwater Robots ◽  
Acoustic Disturbance ◽  
Marine Fauna ◽  
Acoustic Data

Underwater robots emit sound during operations which can deteriorate the quality of acoustic data recorded by on-board sensors or disturb marine fauna during in vivo observations. Notwithstanding this, there have only been a few attempts at characterizing the acoustic emissions of underwater robots in the literature, and the datasheets of commercially available devices do not report information on this topic. This work has a twofold goal. First, we identified a setup consisting of a camera directly mounted on the robot structure to acquire the acoustic data and two indicators (i.e., spectral roll-off point and noise introduced to the environment) to provide a simple and intuitive characterization of the acoustic emissions of underwater robots carrying out specific maneuvers in specific environments. Second, we performed the proposed analysis on three underwater robots belonging to the classes of remotely operated vehicles and underwater legged robots. Our results showed how the legged device produced a clearly different signature compared to remotely operated vehicles which can be an advantage in operations that require low acoustic disturbance. Finally, we argue that the proposed indicators, obtained through a standardized procedure, may be a useful addition to datasheets of existing underwater robots.

Deep diving with Clio

2020 ◽  
Vol 5 (48) ◽  
pp. eabf1499
Author(s):  
Jnaneshwar Das ◽  
Elizabeth Trembath-Reichert
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Ocean Basin ◽  
Deep Diving ◽  
Basin Scale

An autonomous underwater vehicle, named Clio, can sample ocean basin–scale biogeochemistry at depths up to 6000 meters.

Nature Conservation in Rangelands: Lessons From Research on Reserve Selection in New South Wales.

1992 ◽  
Vol 14 (2) ◽  
pp. 214 ◽  
Author(s):  
RL Pressey
Keyword(s):  
Conservation Planning ◽  
New South ◽  
Full Range ◽  
New South Wales ◽  
Reserve Selection ◽  
South Wales ◽  
Land Systems ◽  
The Difference ◽  
Selection Of

Information on the features to be protected in a system of conservation reserves is an obvious requirement. The quality of the data base will primarily determine the effectiveness of conservation planning in protecting the full range of natural features in a region. However, the way in which data are used to make decisions on the locations of protected areas is also critical. Rigorous procedures for reserve selection can make the difference between achieving reservation goals or not. Research on reserve selection in New South Wales over recent years has concerned both data bases and procedures for guiding decisions. Reserve planning in many regions is based largely on some form of land classification like vegetation types or land systems. There are good reasons for using such land classes to guide the selection of reserves and to judge their representativeness. Nevertheless, they can have considerable limitations as a basis for protecting all the species in a region. These limitations are reviewed with references to more detailed discussions of particular issues. The paper also reviews a variety of procedures for selecting reserves which have been tested and applied in New South Wales. Some of the recent procedures are conceptually simple but very useful in identifying the requirements of reservation goals and demonstrating the options available to planners for representing particular features. Three principles are proposed which should underpin any attempt at systematic conservation planning.

scholarly journals Determinants of quality of life in pediatric- and adult-onset multiple sclerosis

Neurology ◽  
2019 ◽  
Vol 94 (9) ◽  
pp. e932-e941 ◽  
Author(s):  
Kyla A. McKay ◽  
Olivia Ernstsson ◽  
Ali Manouchehrinia ◽  
Tomas Olsson ◽  
Jan Hillert
Keyword(s):  
Quality Of Life ◽  
Multiple Sclerosis ◽  
Psychological Status ◽  
Adult Onset ◽  
Processing Efficiency ◽  
Impact Scale ◽  
Neurologic Disability ◽  
Vas Scores ◽  
Eq Vas

ObjectiveTo evaluate quality of life (QoL), measured by the EQ-5D, in adults with pediatric-onset multiple sclerosis (POMS) or adult-onset multiple sclerosis (AOMS) and explore determinants of QoL in both groups.MethodsData were collected from the nationwide Swedish multiple sclerosis (MS) registry. Demographic characteristics, EQ-5D-3 level, Multiple Sclerosis Impact Scale (MSIS-29) score, Expanded Disability Status Scale (EDSS) score, Symbol Digit Modalities Test score, relapses, and disease-modifying therapy (DMT) exposure were collected on an approximately annual basis (2011–2019). Patients with definite MS with ≥2 EQ-5D measurements collected between ages 18 and 50 were included. The principal outcome was the EQ-5D visual analogue scale (EQ-VAS) score. Linear mixed models compared all available EQ-VAS scores between patients with POMS and patients with AOMS and determinants of EQ-VAS among patients with POMS and patients with AOMS (assessed separately).ResultsA total of 5,094 persons met inclusion criteria: 354 (6.9%) had POMS. A total of 21,357 unique EQ-5D scores were recorded. Most participants were female (70.0%) with a relapsing-onset disease course (98.1%). There was no difference in EQ-VAS scores between patients with POMS and patients with AOMS following adjustment for confounders (β-coefficient for patients with POMS vs patients with AOMS [reference]: 0.99; 95% confidence interval −0.89 to 2.87). Experiencing a relapse, severe neurologic disability (EDSS ≥6.0 vs <3.0), and higher MSIS-29 psychological score were consistently associated with lower QoL, while higher information processing efficiency and exposure to first-line DMTs were associated with higher QoL scores in both groups.ConclusionsThere were no differences in QoL between patients with POMS and patients with AOMS in adulthood. Findings provide support for a focus on reducing neurologic disability and improving psychological status as approaches to potentially improve the QoL of persons with MS.

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