Search results for "550"
showing 10 items of 1192 documents
Ultrathin Tropical Tropopause Clouds (UTTCs) : I. Cloud morphology and occurrence
2003
Abstract. Subvisible cirrus clouds (SVCs) may contribute to dehydration close to the tropical tropopause. The higher and colder SVCs and the larger their ice crystals, the more likely they represent the last efficient point of contact of the gas phase with the ice phase and, hence, the last dehydrating step, before the air enters the stratosphere. The first simultaneous in situ and remote sensing measurements of SVCs were taken during the APE-THESEO campaign in the western Indian ocean in February/March 1999. The observed clouds, termed Ultrathin Tropical Tropopause Clouds (UTTCs), belong to the geometrically and optically thinnest large-scale clouds in the Earth's atmosphere. Individual UT…
Highly resolved observations of trace gases in the lowermost stratosphere and upper troposphere from the Spurt project: an overview
2005
International audience; During SPURT (Spurenstofftransport in der Tropopausenregion, trace gas transport in the tropopause region) we performed measurements of a wide range of trace gases with different lifetimes and sink/source characteristics in the northern hemispheric upper troposphere (UT) and lowermost stratosphere (LMS). A large number of in-situ instruments were deployed on board a Learjet 35A, flying at altitudes up to 13.7 km, at times reaching to nearly 380 K potential temperature. Eight measurement campaigns (consisting of a total of 36 flights), distributed over all seasons and typically covering latitudes between 35° N and 75° N in the European longitude sector (10° W?20° E), …
In Situ, Airborne Instrumentation: Addressing and Solving Measurement Problems in Ice Clouds
2012
The workshop on in situ airborne instrumentation: addressing and solving measurement problems in ice clouds, June 25-27, 2010, Oregon, aimed to identify unresolved questions concerning ice formation and evolution in ice clouds, assess the current state of instrumentation that can address these problems, introduce emerging technology that may overcome current measurement issues, and recommend future courses of action to improve our understanding of ice cloud microphysical. Eleven presentations were made covering measurement challenges associated measuring the composition and concentration of all the modes of ice nuclei (IN), measuring the morphology, mass, surface, and optical properties of …
Ultrathin Tropical Tropopause Clouds (UTTCs): II. Stabilization mechanisms
2003
Abstract. Mechanisms by which subvisible cirrus clouds (SVCs) might contribute to dehydration close to the tropical tropopause are not well understood. Recently Ultrathin Tropical Tropopause Clouds (UTTCs) with optical depths around 10-4 have been detected in the western Indian ocean. These clouds cover thousands of square kilometers as 200-300 m thick distinct and homogeneous layer just below the tropical tropopause. In their condensed phase UTTCs contain only 1-5% of the total water, and essentially no nitric acid. A new cloud stabilization mechanism is required to explain this small fraction of the condensed water content in the clouds and their small vertical thickness. This work sugges…
In-Situ observation of New Particle Formation in the upper troposphere/lower stratosphere of the Asian Monsoon Anticyclone
2020
Abstract. During the monsoon season of the year 2017 the airborne StratoClim mission took place in Kathmandu, Nepal with eight mission flights of the M-55 Geophysica in the upper troposphere/lower stratosphere (UT/LS) of the Asian Monsoon Anticyclone (AMA) over northern India, Nepal and Bangladesh. More than hundred events of New Particle Formation (NPF) were observed. In total, more than two hours of flight time were spent under NPF conditions as indicated by the abundant presence of ultrafine aerosols, i.e. with particle diameters dp smaller than 15 nm, which were in-situ detected by means of condensation nuclei counting techniques. Mixing ratios of ultrafine particles (nuf) of up to ~ 50…
Application Development from Prototype to Beta : A Case Study of the Application SeafarerCV
2018
Master's thesis Multimedia and Educational Technology MM500 - University of Agder 2018 When the prototype of a software product is completed and approved, development of a betaready resource is often the natural step toward a future final release. This process contains many steps that may prove vital to the eventual success or downfall of a future product. Technologies must be chosen, design methodologies must be followed, and care must be given to provide the final product with a solid foundation to build upon. This thesis follows such a development process for the development of resources for beta-testing. This process, as well as the human centered design approaches, and the resulting re…
Spectral calibration of hyperspectral imagery using atmospheric absorption features
2006
One of the initial steps in the preprocessing of remote sensing data is the atmospheric correction of the at-sensor radiance images, i.e., radiances recorded at the sensor aperture. Apart from the accuracy in the estimation of the concentrations of the main atmospheric species, the retrieved surface reflectance is also influenced by the spectral calibration of the sensor, especially in those wavelengths mostly affected by gaseous absorptions. In particular, errors in the surface reflectance appear when a systematic shift in the nominal channel positions occurs. A method to assess the spectral calibration of hyperspectral imaging spectrometers from the acquired imagery is presented in this p…
SmartCrowding™ : Bruk av SmartCrowding™ i komplekse situasjoner ved Stavanger Universitetssykehus
2019
Masteroppgave helse- og sosialinformatikk HSI500 - Universitetet i Agder 2019 Background: Over the past years, over-filled hospital wards, critical and complex situations has created an increased amount of difficulties in Norwegian hospitals. This is also true for Stavanger University Hospital. In order to better tradethese challenging situations, Stavanger University Hospital decided to implement «plan for høy aktivitet»(«plan for high activity»), and «Smartcrowding™» as Multi Criteria Decision Analyses Software. The intended purpose of these tools is to ensure a higher level of patient safety, as well as to generate a common understandingof the activity level at Stavanger University Hospi…
Kan brist i alarmkjeden unngås? : Delphistudie med funn av faktorer som er viktige for kvalitetssikring i et velferdsteknologisk responssenter
2016
Masteroppgave i helse- og sosialinformatikk- Universitetet i Agder, 2016 The future brings with it an increased number of elderly in need of aid or assistance. One way of meeting these challenges is an increased usage of healthcare technological solutions. Through media, it is illustrated that there have been several unfortunate incidents related to the handling of personal alarm systems. This has happened not only when receiving an alarm at the responsecenter, but also with the turn-out at the place of emergency. The goal with this study is to identify important factors that are necessary to secure the quality at the responsecenters when the alarms are received and how they are forwarded a…
Brukeradopsjon av ACOS Individuell plan hos plankoordinatorene : En studie med kombinerte metoder om påvirkningsfaktorer for plankoordinatorenes bruk…
2018
Masteroppgave i helse- og sosialinformatikk HSI500 - Universitetet i Agder 2018 Individual care plan is a comprehensive plan to assist users in need of long-term and coordinated services. Individual care plan is one of several service areas in the municipality digitized for better flow of work procedures, lower costs and increased user involvement. The ACOS IP program enables electronic IP in the municipalities. The study has investigated which main factors affect the plan coordinators user adoption of ACOS IP. User adoption looks at why and how a program is used. The purpose is to look at it from the plan coordinator's perspective, but also how the management at the coordinating unit's fra…