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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
251

Messverfahren zur Bestimmung der Partikelanzahlkonzentration in Umweltaerosolen

Hillemann, Lars 02 July 2013 (has links)
Die natürliche Umgebungsluft enthält Aerosolpartikel, deren Größe von wenigen Nanometern bis zu einigen Mikrometern reicht. Insbesondere anthropogenen ultrafeinen Partikeln, die kleiner als 100 nm sind, werden negative Wirkungen auf die menschliche Gesundheit zugeschrieben. Die gravimetrische Messung der Partikelmassekonzentration erfasst ultrafeine Partikel nur ungenügend, da die Masse dieser Partikel sehr gering ist. Deutlich empfindlicher gelingt die Quantifizierung ultrafeiner Partikel durch die Messung der Partikelanzahlkonzentration. Die Arbeit beschreibt ein Verfahren zur Messung der Anzahlkonzentration von Partikeln in Umweltaerosolen. Es verknüpft die elektrische Aufladung der Partikel mit deren Klassierung im elektrischen Feld und ihre Mengenbestimmung anhand der elektrischen Ladung. Mittels des entwickelten Sensormodells gelingt die Verbindung der gemessenen Rohdaten mit der Anzahlgrößenverteilung der Partikel durch eine Kernfunktion in einer Fredholmschen Integralgleichung erster Art. Zur Dateninversion wird diese Gleichung in diskreter Form als lineares Gleichungssystem genutzt. Dessen Koeffizienten bilden die Kernmatrix, welche mit einer neu entwickelten Methode experimentell bestimmt wird. Vergleichsmessungen zeigen eine gute Übereinstimmung des Verfahrens mit Referenzverfahren der Aerosolmesstechnik und unterstreichen die Eignung des Verfahrens zur Partikelquantifizierung in Umweltmessnetzen.
252

OBD-II monitor using smartphone and cloud solutions : For ECO driving

Olofsson, Didrik January 2022 (has links)
Fuel consumption of transportation vehicles account for nearly 27% of CO2 emissions from fossil fuel. The environmental impact of of transportation can be lowered with effective ECOfriendly driving. As modern vehicles are equipped with the on-board diagnostics (OBD) system that provides vehicle’s self-diagnostic data which is accessible to from the OBD-II socket in vehicles. The aim of this thesis is to design and implement such a monitor system that consists of an OBD-II reader (containing a Bluetooth communication module) to fetch data from the OBD-II socket and then, via a smartphone, send the data to a cloud server for analysis and visualisation. For this purpose, an ELM327 Bluetooth module (an off-the-shelf OBD-II dongle) was bought, an application has been created for an Android smartphone, and a cloud server has been created using ThinkSpeak (an online solution for cloud data collection and visualisation).   As a result, such monitor system has been implemented at low cost, and then tested and evaluated together with a Toyota Prius driving a round-trip between the Swedish cities of Uppsala and Arlanda. The test results have shown that the system is successful in gathering data from the OBD-II socket and then sending visualizing data. It needs, however, further work to increase the user-friendliness and accuracy of the gathered information from the vehicle. / OBD-II är en internationell standard i fordon som är obligatorisk i moderna bilar möjliggör att med hjälp av hårdvara läsa av information från bilen under färd. Det medför att man kan överföra data så som hastighet, bränsleförbrukning och motortemperaturfrån bilen till en annan tjänst där det presenteras för föraren. Metoden går ut på att transmittera informationen som läses av sensorer i bilen till en internettupkopplad mobiltelefon som för över informationen till en molntjänsst. Datan från bilen ska sedankompletteras med positionsinformation från mobilenhetens GPS enhet. Detta medför att skapandet av en applikation som kan uppfylla målen blir är en central del av projektet. ELM327 är en hårdvarumodul som är designad för att kopplas till ett OBD-II uttag. Modulen kan då läsa av data från CAN bussen i bilen och sedan konverterainformationen till en Bluetooth enhet. En mobiltelefon kan då kommunicera med Bluetooth enheten genom att skapa en Android applikation i utveklarverktyget Androidstudio. Applikationen för sedan över datan till molntjänsten ThingSpeak, som är designat för IoT project. ThingSpeak har en implementering av MatLab, en programmerings plattform för ingenjörer, som låter användaren analysera och visualiseradata i molntjänsten. En begränsning som uppstår är hur mycket pengar som investeras i projetet vilket har inflytande på hur ofta datan kan uppdateras i molntjänsten, vilket påverkar nogrannheten i resultatet. I tesen diskuteras även begränsningarna av systemet och olika utvecklingsmöjligheter av projektet.
253

Wearable Heart Sound and EKG Recorder

Larson, Grace R 01 June 2020 (has links) (PDF)
Acute congestive heart failure is a leading cause of morbidity and mortality. Patients often undergo repeated hospitalizations with an annual cost in excess of $32B dollars. Early detection of impending acute congestion allows for pharmaceutical interdiction that prevents hospitalization, improves outcomes, and reduces healthcare spending. A subcutaneous implantable monitoring device that detects impending acute congestive heart failure by using heart sounds may provide a valuable tool that can be used to titrate heart failure medications to prevent acute heart failure requiring hospitalization. The device may be used to measure changes in the intervals between the R-wave and S1 and S2 heart sounds, and to detect evolving S3 and S4 heart sounds consistent with volume overload. The amplitudes of S1 and S3 heart sounds change as heart failure patients' symptoms worsen. Designing a non-invasive, external device, capable of recording heart sounds and EKGs in patients undergoing pharmaceutical regression of acute congestive heart failure in a hospital setting may give important insight into the nature of heart sound and EKG changes that occur in patients during progression of acute heart failure while they lead their day-to-day lives. This thesis details the design of a portable, non-invasive device, worn externally on the left-pectoral muscle, capable of continuously recording human EKG signals and heart sounds (through custom MEMS accelerometer technology) over a period of two days. Hardware testing for the scope of this thesis exclusively involved healthy volunteers.
254

Two- And Three-Plane Job Risk Classification Using Motion Capture: An Examination Of The Marras Et Al. Model, 1993

Cappelli, Tara Marie 10 December 2005 (has links)
Lower Back Disorders account for 16-19% of work related claims and 33-41% of dollars paid in workers? compensation (as cited in Marras, 1999), with impacts to society approaching $100 billion dollars annually (as cited in Marras et al., 1999). Dr. William Marras engineered a device to track trunk kinematics in order to develop a Job Risk Classification Model for predicting high-risk group probability of lower back injury. The device has been validated, but other technologies such as 3-D motion capture can potentially gather the same data. This study examined the use of motion capture to apply two- and three-plane lifting tasks to the Marras model and compare results with commonly used assessment techniques. Regardless of the fact that the Marras model results were drastically different from NIOSH and RULA, motion capture was able to gather all necessary data for running the models and has a promising future in ergonomic assessments.
255

Use of the Ambulatory Phonation Monitor with College Professors of Performing Arts

Niehaus, Amanda Jo 08 March 2010 (has links)
No description available.
256

Development of the real-time data acquisition system for Philips Patient Monitor

Guo, Fei 29 August 2014 (has links)
No description available.
257

Mindfulness, Cortisol, and Sexual Minorities: Investigation of the effects of Mindfulness on Diurnal Cortisol Patterns in Sexual Minorities

Sinegar, Samantha E. 22 June 2017 (has links)
No description available.
258

Development of an Optical Heart Rate Monitor using a Microchip PIC24-microcontroller based development board

Rakurthi, Aparna 21 September 2012 (has links)
No description available.
259

Validity of a commercially-available, low-cost, wrist-mounted accelerometer in a laboratory and free-living environment

Newton, Andrew T. 14 December 2016 (has links)
No description available.
260

Characteristics of a real-time digital terrain database Integrity Monitor for a Synthetic Vision System

Campbell, Jacob January 2001 (has links)
No description available.

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