Blar i NTNU Open på forfatter "Hjelme, Dag Roar"
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A finite element model of plasmonic particle arrays for glucose sensing by surface-enhanced Raman scattering
Malyshev, Roman (Master thesis, 2020)Optiske biosensorer basert på overflate-forsterket Ramanspredning (SERS) har vært forsket på i flere tiår, grunnet deres store applikasjonsområde. Kontinuerlige blodsukkermålinger er en anvendelse der slike innretninger ... -
A miniaturized ball-lensed fiber optic NIR transmission spectroscopy-based glucose sensor
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Larsen Jernelv, Ine; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar (Chapter, 2018)A novel ball-lensed fiber transmission sensor is presented aimed at in vivo continuous glucose monitoring of diabetics. Preliminary results yield 20 mM RMSE, limited by mechanical instability. The design enables flexibility ... -
A Review of Optical Methods for Continuous Glucose Monitoring
Jernelv, Ine Larsen; Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Hjelme, Dag Roar; Ellingsen, Reinold; Aksnes, Astrid (Journal article; Peer reviewed, 2018)Frequent glucose monitoring is a fundamental part of diabetes management, and good glucose control is important for long-term health outcomes. New types of electrochemical sensors that allow for continuous glucose monitoring ... -
A Review of the Role of Critical Parameters in the Design and Operation of Biogas Production Plants
Sarker, Shiplu; Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust (Journal article; Peer reviewed, 2019)Many operating parameters, individually or together, may influence the performance of anaerobic digestion towards biogas or digestate yield and quality maximization. The most preferred method of optimizing an anaerobic ... -
A Single Point, Multi-Parameter, Fiber Optic Sensor Based on a Combination of Interferometry and LSPR
Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar (Journal article; Peer reviewed, 2018)We demonstrate a new single point, multi-parameter, fiber optic sensor concept based on a combination of interferometric and plasmonic sensor modalities on an optical fiber end face. The sensor consists of an extrinsic ... -
Addressing Challenges in Fabricating Reflection-2 Based Fiber Optic Interferometers
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar (Journal article; Peer reviewed, 2019)abrication of multimode fiber optic interferometers requires accurate control of certain parameters to obtain reproducible results. This paper evaluates the consequences of practical challenges in fabricating reflection-based, ... -
Analysis of Boronic Acid Concentration in a Hydrogel by means of Fluorescence using Double Clad Fibers
Sandberg, Gabriel (Master thesis, 2021) -
Blood Glucose Control Using a Novel Continuous Blood Glucose Monitor and Repetitive Intravenous Insulin Boluses: Exploiting Natural Insulin Pulsatility as a Principle for a Future Artificial Pancreas
Skjaervold, Nils Kristian; Østling, Dan; Hjelme, Dag Roar; Spigset, Olav; Lyng, Oddveig; Aadahl, Petter (Journal article; Peer reviewed, 2013)The aim of this study was to construct a glucose regulatory algorithm by employing the natural pulsatile pattern of insulin secretion and the oscillatory pattern of resting blood glucose levels and further to regulate the ... -
Bowel Sounds Localisation
Angonin, Céline Annie Jacqueline (Master thesis, 2021)En lokalisering av tarmlyder på fire forskjellige deler av magen ble realisert. For å oppnå lokalisereringen, ble det konstruert en binær klassifikator ved hjelp av en støttevektormaskin og en enklere klassifikator basert ... -
Carbohydrate Yield and Biomethane Potential from Enzymatically Hydrolysed Saccharina latissima and Its Industrial Potential
Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust (Journal article; Peer reviewed, 2019)The demand for fuel for utilisation of machinery and transport has culminated in large amounts of fossil fuel usage in the last century. The environmental dangers attached with the usage of fossil fuels have created a large ... -
Classification of municipal solid waste using deep convolutional neural network model applied to multispectral images
Muri, Harald Ian; Hjelme, Dag Roar (Peer reviewed; Journal article, 2021)Minimization of the environmental impact of the incineration process and to produce energy efficiently are the most important considerations in obtaining efficient operation of waste-to-energy (WtE) plants. WtE operation ... -
Colorophone 2.0: A Wearable Color Sonification Device Generating Live Stereo-Soundscapes—Design, Implementation, and Usability Audit
Osiński, Dominik; Łukowska, Marta; Hjelme, Dag Roar; Michał, Wierzchoń (Peer reviewed; Journal article, 2021)The successful development of a system realizing color sonification would enable auditory representation of the visual environment. The primary beneficiary of such a system would be people that cannot directly access visual ... -
Combined temperature and RI sensor for exploring the phase transitions of ethanol solutions
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar (Chapter, 2018)A fiber optic interferometer based on core diameter mismatch is used in reflection mode to study the behavior of ethanol solutions with regards to concentration dependent thermal properties and phase transitions. A method ... -
Design of sensor system for slump test of fresh concrete
Thorvaldsen, Tobias (Master thesis, 2022)Å få et mål på konsistensen til fersk betong er essensielt for en bygningsarbeider for å vite om et spesifikt parti med betong kan brukes. Slumptesten er en av mange eksisterende metoder for å måle konsistensen til fersk ... -
Detection of Bowel Sounds using machine learning and the ability to use it in early meal detection
Laajab, Khadija (Master thesis, 2022)Denne oppgaven beskriver implementering av en tarmlyddetektor ved bruk av maskinlæring og muligheten til å bruke det i tidlig måltidsdeteksjon. En slik metode kan brukes til å optimalisere avanserte glukosemålere, som for ... -
Digitalization of colourimetric sensor arrays for volatile fatty acid detection in anaerobic digestion
Lamb, Jacob Joseph; Lien, Kristian Myklebust; Hjelme, Dag Roar (Journal article; Peer reviewed, 2019)During the process of converting the organic matter into methane, many volatile fatty acids (VFAs) are produced during acidogenesis and acetogenesis phases of the process. The main VFAs of interest are acetic acid, butyric ... -
Digitalization of Sustainable Energy Production Processes
Awais, Muhammad (Master thesis, 2021)Biogas production is growing as a renewable energy source. In order to maximize energy production, it is essential to ensure that the production process is economical and efficient. This report discusses the anaerobic ... -
Dual parameter fiber optic sensor combining a Fabry-Perot and a Mach-Zehnder interferometer
Hammarling, Krister; Wahl, Markus Solberg; Muri, Harald Ian; Engholm, Magnus; Hjelme, Dag Roar (Journal article, 2017)A new concept for dual parameter fiber optic sensor has been developed and characterized, both in a two-fiber and single-fiber configuration. The liquid sensor measures ethanol concentration with a stimuli responsive ... -
Effect of power ultrasound and Fenton reagents on the biomethane potential from steam-exploded birchwood
Lamb, Jacob Joseph; Islam, Md Hujjatul; Hjelme, Dag Roar; Pollet, Bruno; Lien, Kristian Myklebust (Journal article; Peer reviewed, 2019)The global demand for non-fossil energy sources is increasing rapidly. As a result, biogas presents a suitable alternative; however, first generation biofuels (e.g., sugar cane) potentially impact food crops globally. ... -
Effect of sensor location on continuous intraperitoneal glucose sensing in an animal model
Åm, Marte Kierulf; Kölle, Konstanze; Fougner, Anders Lyngvi; Dirnena-Fusini, Ilze; Bösch, Patrick Christian; Ellingsen, Reinold; Hjelme, Dag Roar; Stavdahl, Øyvind; Carlsen, Sven Magnus; Christiansen, Sverre (Journal article; Peer reviewed, 2018)In diabetes research, the development of the artificial pancreas has been a major topic since continuous glucose monitoring became available in the early 2000’s. A prerequisite for an artificial pancreas is fast and reliable ...