Quantification of aeroacoustic noise sources from wind turbines

One of the major environmental concerns regarding wind energy is an increase in noise levels, both in the atmosphere and the ocean. In this study, the generation and propagation of aeroacoustic noise from wind turbines were studied using available measurements together with several signal processing tools, as well as some well-known models within the field. The thesis starts by introducing some general and more advanced concepts regarding wind energy and aeroacoustics. Observational measurements conducted in a gust wind tunnel on a scaled wind turbine model were used to quantify noise characteristics from wind turbines. The experiment was conducted using 48 microphones in a ring array, with a known distance from the source. Then, a simple beamforming algorithm based on delay-and-sum in both 1D and 2D has been applied to identify the distribution of acoustic source strength on the turbine blade and subregions. An open-source program for the Amiet model was adjusted for studying the turbulence interaction and noise generation on the same NACA4412-airfoil, with some simplifications applied. Next, the low-frequency Parabolic Equation model (PE-model) for an inhomogeneous atmosphere was used to study the effect of different atmospheric stability conditions on noise propagation from a wind turbine. Tests for three stability conditions (stable, neutral, and unstable) for variations of source frequencies, as well as for different topography were presented and discussed. The studies conducted in this thesis illustrate the complexity of aeroacoustic noise and the different parts that need to be accounted for in the development of new wind farms, both onshore and offshore.Masteroppgåve i energiENERGI399

Comparative transcriptomics of wood formation in angiosperms and gymnosperms

Wood, or secondary xylem, is formed during secondary growth and serves as a structural element as well as part of a plants vascular system. Secondary xylem is largely comprised of cells with lignified secondary cell walls to which the rigidity of the tissue is attributed. Secondary growth is observed throughout the plant kingdom but is most prominent in trees. Trees are seed-producing, vascular plants that are divided into two groups based on their method of reproduction: angiosperms and gymnosperms. Most tree species belong to the group of flowering plants, the angiosperms, which are estimated to have evolved 200 million years after the first gymnosperms. Despite this ancient divergence, wood formation as a phenotype is conserved between the gymnosperms and angiosperms. Much is understood about the various processes involved in secondary growth, but little is known about the more ancient, underlaying mechanisms governing wood formation. For this thesis, high-resolution transcriptomics was used to capture the similarities in wood formation across three gymnosperm species and three angiosperm species. Orthologs conserved between the pairs of species were identified using co-expression network analysis, thereby combining similarity in molecular function with biological function. Orthologs conserved across all pairs of species were identified using sub-networks, cliques. The genes conserved across all species were involved in various processes associated with secondary growth, and certain genes were suggested as marker gene candidates for the various tissues. These genes included homologs of PHLOEM PROTEIN2 (PP2), CELL DIVISION CONTROLL2 (CDC2) and transcription factors for formation of actin filaments

Geologic controls on fluid flow and seismic imaging of faults in carbonate rocks : Insights from quantitative outcrop analysis and reflection seismic modeling

Utforsking av undergrunnen har historisk sett hovudsakleg vore drive av økonomiske insentiv gjennom leiting etter hydrokarbon og andre geologiske ressursar. I nyare tid, derimot, har geologiens rolle i det grøne skiftet fått aukande fokus. Undergrunnen er svært viktig for blant anna CO2- og hydrogenlagring, grunnvassressursar og geotermisk energi, og avgjerande for alle disse bruksområda er strukturar som forkastingar og sprekkenettverk, og deira kontroll på væskestraum i undergrunnen. Hovudfokuset i denne avhandlinga er å forbetre forståinga av undergrunnen gjennom to overordna tema; (i) kontrollen forkastings- og sprekkenettverk har på væskestraum og reaksjonar mellom væsker og bergartar, og (ii) seismisk avbilding av slike forkastingar og deira væske-bergart reaksjonsprodukt i undergrunnen. Sjølv om det er generell einigheit i at geologiske strukturer utøver sterk kontroll på væskestraum, har få forsøkt å kvantifisere dette forholdet. I samsvar med tema (i) ovanfor byrjar denne avhandlinga difor med å kvantifisere og visualisere forholdet mellom væskestraum og strukturell kompleksitet (Artikkel 1). Ved hjelp av sementerte haugar med lav porøsitet som bevis for paleo-væskestraum, nyttast topologi for å karakterisere og visualisere strukturell kompleksitet i lokaliserte område, og kvantitativt dokumentere deira korrelasjon med områder for lokalisert paleo-væskestraum. Artikkel 2 gir ei oversikt over geologiske kontrollar på væskestraum i sedimentære bergartar, basert på ein kombinasjon av litteraturanalyse og studie av eksempel frå felt der jernoksidutfelling blir brukt som bevis for paleo-væskestraum. Artikkelen dokumenterer eit vidt spenn av kontrollar på væskestraum og inkluderer alt frå enkle geologiske heterogeniteter til meir komplekse nettverk av strukturar, og dokumenterer og kvantifiserer topologien til både sprekkenettverk og hybridnettverk beståande av ein kombinasjon av sprekker og sedimentære avsetningsstrukturar som fungerer som leiarar for væskestraum. Eit viktig verktøy for kartlegging av slike væskeleiande strukturar i undergrunnen er seismiske refleksjonsdata. I tråd med Tema (ii), undersøkjer Artikkel 3 effekten av småskala forkastingar (nær eller under seismisk oppløysing) på seismiske bilde ved hjelp av seismisk modellering. Hovudmålet i denne artikkelen er å dokumentere effekten som forkastingar under- eller på grensa til seismisk oppløysing kan ha på seismiske data. For eksempel illustrerer artikkelen korleis subtile forandringar i ein refleksjon kan vere resultat av små forkastingar i undergrunnen, noko som er viktig ny innsikt og som mogleg kan bidra til å forbetre tolking av strukturar i seismikk. I tillegg til avbilding av forkastingar i seg sjølv, er også produkta av væske-bergart interaksjon av interesse, og det er derfor viktig å også forstå deira seismiske signatur. Ved hjelp av seismisk modellering av forkastingskontrollerte dolomittar i ei kalksteinsdominert sone i Suezbukta, blir seismisk avbilding av både massive og stratigrafisk kontrollerte dolomittkroppar undersøkt med varierande geologiske og geofysiske parametrar i Artikkel 4. Resultata i denne artikkelen gir ny innsikt i korleis forkastingskontrollerte hydrotermale dolomittkroppar blir avbilda i seismiske data; artikkelen dokumenterer at dei generelle trendane og nærværet av dolomitt i undergrunnen er mogleg å slutte frå seismiske data, men identifisering av individuelle, stratigrafisk kontrollerte dolomittkroppar er ikkje stadfesta mogleg. Funna frå denne avhandlinga fremjar den grunnleggande forståinga av sentrale geologiske kontrollar på væskestraum i undergrunnen, og avbilding av potensielt strøymingskontrollerande forkastingar og deira bergreaktive produkt i refleksjonsseismiske data. Den nye innsikta presentert i avhandlinga har eit breitt spekter av implikasjonar og nytteområde, for eksempel for lokalisering av økonomisk betydelege førekomstar av nyttige mineral, i risikovurdering for CO2- og hydrogenlagring, grunnvasshandtering, lokalisering av forureining, og meir.Exploration of the sub-surface has historically largely been driven by economic incentives through potential hydrocarbon recovery, but more recently the role of subsurface geology in the green shift has gained more focus. The subsurface are highly important for CO2- and hydrogen storage, freshwater resources, and geothermal energy to name a few, and crucial for all these are structures such as faults and their conjugate damage zones, veins, joints, and deformation bands, as well as the depositional architecture of the host rock. This thesis aim to improve our understanding of the sub-surface through two overarching themes, (i) fault and fracture networks and their controls on fluid flow and fluid-rock interaction, and (ii) the seismic imaging of such faults and their fluid-rock reactive products in the subsurface. Despite the consensus that structures exert strong control on fluid flow, few have attempted to quantify this relationship. In accordance with theme (i) above, this thesis therefore starts by quantifying and visualizing the relationship between fluid flow and structural complexity; using low-porosity cemented mounds as a record of paleo-fluid flow and topological characterization, zones of past fluid flow and areas of structural complexity are correlated and documented. Further, an overview of controls on fluid flow is given through literature review and documentation of outcrops using iron oxide precipitates as proxy for paleo-fluid flow; the fluid flow controls are ranging from simple geological heterogeneities to more complex networks of structures, and through topological characterization, the connectivity of fracture networks and hybrid networks are documented. The structures controlling flow can be found at all scales, but as the most commonly used tool for subsurface investigation is seismic imaging many of these will fall below seismic resolution. Following theme (ii), we investigate the effect of sub-seismic faults on seismic imaging using synthetic seismic from outcrop analogues and prove that under the right conditions, faults with throw as low as 5 m still produce distortion of reflections. But not only fault and fractures but also the products of fluid-rock interaction are of interest to explore in the subsurface, and hence it is important to understand their seismic signature. Using seismic modelling of fault-controlled dolomites in a limestone-dominated succession in the Golf of Suez it is found that the presence of both stratabound and massive dolomite bodies can be inferred, although only the massive dolomite can be distinguished individually. The findings form this thesis have implications for the fundamental understanding of how fluids are controlled in the subsurface, and present examples of how these controls might be imaged in reflection seismic data. This is in turn critical for a variety of processes and areas such as locating economically significant ore deposits, hydrocarbon seal risk assessment, prediction of earthquakes, groundwater management, and more. Due to the vast number of processes that are controlled by sub-surface fluid flow it is of both environmental, societal, and economic interest to be able to predict and understand fluid flow pathways, how they interact to form networks, and how they and their fluid-rock interactive products might be portrayed in reflection seismic data.Doktorgradsavhandlin

Operatørgrensesnitt, topside kommunikasjon for fjernstyrt undervannsfartøy og styring av ROV og Manipulator.

Denne bacheloroppgaven innebar utvikling av et overflatesystem for et fjernstyrt undervannsfartøy (ROV) som ble skapt av tverrfaglige grupper i studentorganisasjonen UiS Subsea. ROV-en ble utformet for å oppfylle betingelsene for MATE-konkurransen, som arrangeres i Colorado, USA, tidlig på sommeren. Overflatesystemet krevde tre hovedimplementeringer for å oppfylle sitt formål. Det første var en etablert forbindelse mellom overflate og undervannsdelen ved hjelp av UDP og TCP. Det andre var å legge til manøvreringsmuligheter for ROV-en og manipulatoren ved bruk av kontrollere. Det tredje var det grafiske brukergrensesnittet (GUI) for å presentere all relevant informasjon fra ROV-en. Systemet var modulært, noe som innebar at det var enkelt å endre og implementere nye funksjoner. Det var basert på fjorårets overflatesystem, men har blitt betydelig endret på grunn av andre behov og krav. Det hadde en god struktur, med effektive klasser. Prosjektet ble delt inn i deloppgaver for å forenkle implementeringsprosessen og øke effektiviteten. Denne tilnærmingen resulterte i det endelige produktet - overflatesystemet. ROV-en var styrbar, GUI-et viste nødvendig informasjon, og dataflyten fungerte bra. Systemet vil bli ytterligere forbedret i forkant av MATE-konkurransen, men dette vil ikke bli inkludert i bacheloroppgaven da endringene vil bli gjort etter fristen for innlevering av oppgaven.This bachelor thesis consisted of creating a topside system for a remotely operated vehicle (ROV) that was created by interdisciplinary groups in the student organization UiS Subsea. The ROV was created to satisfy the conditions for the MATE competition, which takes place in Colorado, USA, in early summer. The topside system required three main implementations to fulfill its purpose, the first being an established connection between the topside and subside using UDP and TCP, the second was adding maneuverability to the ROV and Manipulator with the use of controllers, and the third being the graphical user interface (GUI) to present all the relevant information from the ROV. The system was modular, which meant it was easy to change and implement functionalities. It was based on last year’s topside system but has been changed significantly because of other needs and requirements. It had a good structure, with well-functioning classes. The project was broken down into sub-tasks to simplify the implementation process and increase efficiency. This approach resulted in the total final product - the topside system. The ROV was controllable, the GUI displayed the necessary information, and the data flow worked well. The system will be further improved toward the MATE competition, which will not be included in the bachelor as the changes will be made after the bachelor thesis deadline

Operatørgrensesnitt, topside kommunikasjon for fjernstyrt undervannsfartøy og styring av ROV og Manipulator.

Denne bacheloroppgaven innebar utvikling av et overflatesystem for et fjernstyrt undervannsfartøy (ROV) som ble skapt av tverrfaglige grupper i studentorganisasjonen UiS Subsea. ROV-en ble utformet for å oppfylle betingelsene for MATE-konkurransen, som arrangeres i Colorado, USA, tidlig på sommeren. Overflatesystemet krevde tre hovedimplementeringer for å oppfylle sitt formål. Det første var en etablert forbindelse mellom overflate og undervannsdelen ved hjelp av UDP og TCP. Det andre var å legge til manøvreringsmuligheter for ROV-en og manipulatoren ved bruk av kontrollere. Det tredje var det grafiske brukergrensesnittet (GUI) for å presentere all relevant informasjon fra ROV-en. Systemet var modulært, noe som innebar at det var enkelt å endre og implementere nye funksjoner. Det var basert på fjorårets overflatesystem, men har blitt betydelig endret på grunn av andre behov og krav. Det hadde en god struktur, med effektive klasser. Prosjektet ble delt inn i deloppgaver for å forenkle implementeringsprosessen og øke effektiviteten. Denne tilnærmingen resulterte i det endelige produktet - overflatesystemet. ROV-en var styrbar, GUI-et viste nødvendig informasjon, og dataflyten fungerte bra. Systemet vil bli ytterligere forbedret i forkant av MATE-konkurransen, men dette vil ikke bli inkludert i bacheloroppgaven da endringene vil bli gjort etter fristen for innlevering av oppgaven.This bachelor thesis consisted of creating a topside system for a remotely operated vehicle (ROV) that was created by interdisciplinary groups in the student organization UiS Subsea. The ROV was created to satisfy the conditions for the MATE competition, which takes place in Colorado, USA, in early summer. The topside system required three main implementations to fulfill its purpose, the first being an established connection between the topside and subside using UDP and TCP, the second was adding maneuverability to the ROV and Manipulator with the use of controllers, and the third being the graphical user interface (GUI) to present all the relevant information from the ROV. The system was modular, which meant it was easy to change and implement functionalities. It was based on last year’s topside system but has been changed significantly because of other needs and requirements. It had a good structure, with well-functioning classes. The project was broken down into sub-tasks to simplify the implementation process and increase efficiency. This approach resulted in the total final product - the topside system. The ROV was controllable, the GUI displayed the necessary information, and the data flow worked well. The system will be further improved toward the MATE competition, which will not be included in the bachelor as the changes will be made after the bachelor thesis deadline

Operatørgrensesnitt, topside kommunikasjon for fjernstyrt undervannsfartøy og styring av ROV og Manipulator.

Denne bacheloroppgaven innebar utvikling av et overflatesystem for et fjernstyrt undervannsfartøy (ROV) som ble skapt av tverrfaglige grupper i studentorganisasjonen UiS Subsea. ROV-en ble utformet for å oppfylle betingelsene for MATE-konkurransen, som arrangeres i Colorado, USA, tidlig på sommeren. Overflatesystemet krevde tre hovedimplementeringer for å oppfylle sitt formål. Det første var en etablert forbindelse mellom overflate og undervannsdelen ved hjelp av UDP og TCP. Det andre var å legge til manøvreringsmuligheter for ROV-en og manipulatoren ved bruk av kontrollere. Det tredje var det grafiske brukergrensesnittet (GUI) for å presentere all relevant informasjon fra ROV-en. Systemet var modulært, noe som innebar at det var enkelt å endre og implementere nye funksjoner. Det var basert på fjorårets overflatesystem, men har blitt betydelig endret på grunn av andre behov og krav. Det hadde en god struktur, med effektive klasser. Prosjektet ble delt inn i deloppgaver for å forenkle implementeringsprosessen og øke effektiviteten. Denne tilnærmingen resulterte i det endelige produktet - overflatesystemet. ROV-en var styrbar, GUI-et viste nødvendig informasjon, og dataflyten fungerte bra. Systemet vil bli ytterligere forbedret i forkant av MATE-konkurransen, men dette vil ikke bli inkludert i bacheloroppgaven da endringene vil bli gjort etter fristen for innlevering av oppgavenThis bachelor thesis consisted of creating a topside system for a remotely operated vehicle (ROV) that was created by interdisciplinary groups in the student organization UiS Subsea. The ROV was created to satisfy the conditions for the MATE competition, which takes place in Colorado, USA, in early summer. The topside system required three main implementations to fulfill its purpose, the first being an established connection between the topside and subside using UDP and TCP, the second was adding maneuverability to the ROV and Manipulator with the use of controllers, and the third being the graphical user interface (GUI) to present all the relevant information from the ROV. The system was modular, which meant it was easy to change and implement functionalities. It was based on last year’s topside system but has been changed significantly because of other needs and requirements. It had a good structure, with well-functioning classes. The project was broken down into sub-tasks to simplify the implementation process and increase efficiency. This approach resulted in the total final product - the topside system. The ROV was controllable, the GUI displayed the necessary information, and the data flow worked well. The system will be further improved toward the MATE competition, which will not be included in the bachelor as the changes will be made after the bachelor thesis deadline

The relationship between fluid flow, structures, and depositional architecture in sedimentary rocks: An example-based overview

Fluid flow in the subsurface is fundamental in a variety of geological processes including volcanism, metamorphism, and mineral dissolution and precipitation. It is also of economic and societal significance given its relevance, for example, within groundwater and contaminant transport, hydrocarbon migration, and precipitation of ore-forming minerals. In this example-based overview, we use the distribution of iron oxide precipitates as a proxy for palaeofluid flow to investigate the relationship between fluid flow, geological structures, and depositional architecture in sedimentary rocks. We analyse and discuss a number of outcrop examples from sandstones and carbonate rocks in New Zealand, Malta, and Utah (USA), showing controls on fluid flow ranging from simple geological heterogeneities to more complex networks of structures. Based on our observations and review of a wide range of the published literature, we conclude that flow within structures and networks is primarily controlled by structure type (e.g., joint and deformation band), geometry (e.g., length and orientation), connectivity (i.e., number of connections in a network), kinematics (e.g., dilation and compaction), and interactions (e.g., relays and intersections) within the network. Additionally, host rock properties and depositional architecture represent important controls on flow and may interfere to create hybrid networks, which are networks of combined structural and stratal conduits for flow.publishedVersio

”Å ha et barn sammen” : Ein studie av fosterforeldre sine forhandlingar med barneverntenesten.

Denne studien handlar om kontakta mellom fosterforeldre og barnevernteneste. Bakgrunnen for temaet er at denne kontakta kan ha betyding for kvaliteten på fosterheimstiltaka og innverknad på fosterbarna sine oppvekstvilkår. Ved å ta utgangspunkt i fosterforeldra sine opplevingar, kan forståinga av kontaktforholdet utvidast. Dermed kan også handlingsrepertoaret til aktørane i verksemda utvidast. Problemstillinga er som følgjer: Korleis forstår fosterforeldra kontakta dei har med barneverntenesten? For å belyse problemstillinga, har eg intervjua ti fosterforeldre frå åtte fosterfamiliar om deira erfaringar frå kontakt med barneverntenesten. Datamaterialet vert konstruert og analysert etter kvalitativ metode med særleg vekt på omgrepa posisjonering og forhandling. Forhandling vert lagt som ein premiss for studien og er eit overordna analytisk perspektiv. Studien viser ein stor variasjon i fosterforeldra sine opplevingar av samhandling med barneverntenesten. Studien viser også rørslene i denne samhandlinga ved at endringar i konteksten medfører endringar i posisjonar og at fosterforeldre også er med på å skape seg posisjonar. Ulike posisjonar medfører ulike forhandlingsmåtar. Forhandlingane viser til at betydningar ikkje er fastlagde, men i stadig forandring. Fosterforeldra forhandlar både med seg sjølv og barnevernarbeidarane om korleis dei skal forstå hendingar. Kompetanse og veiledning er to sentrale områder i kontakta mellom fosterforeldre og barnevernteneste som eg har sett nærmare på. Studien viser at fosterforeldra ser det som viktig at barnevernarbeidaren kjenner barnet og/eller fosterfamilien, og at denne kjennskapen vert sett på som det viktigaste grunnlaget for kompetanse hos barnevernarbeidarane. Studien viser også at fosterforeldra opplever seg som likestilte med barnevernarbeidarane når det gjeld kompetanse på barna. Dei ser på barnevernarbeidarane som kompetente når dei anerkjenner fosterforeldra sin posisjon som den som kjenner barnet best og går i dialog med dei om barnet sitt beste, forutan å utføre dei formelle oppgåvene. Fosterforeldra forventar ikkje nødvendigvis at barnevernarbeidarane skal ha ekspertkunnskap om barn, men må sørgje for å opprette kontakt med andre instansar når barnet viser spesiell åtferd. 6 Fosterforeldra i denne studien oppfattar i utgangspunktet veiledning som råd om korleis dei skal forholde seg i konkrete situasjonar dei står oppe i med barna. Undervegs i intervjua med fosterforeldra reflekterar dei over veiledningsomgrepet, og forståinga av omgrepet forandrar seg til å omfatte meir enn konkrete råd. Studien viser at veiledning handlar om å reflektere over situasjonar og erfaringar med ein annan person som er i stand til å ta deira perspektiv.This research study covers the contact and relationship between foster parents and child welfare services. The reason I chose this subject is that this relationship could influence both the quality level of the decisions made to help the foster parents and also the quality of the living conditions of the foster children. By focusing on foster parents’ point of view, the understanding of this two sided relationship could expand and the ways of action increase. The topic sentence is: How do foster parents interpret the relationship they have with the child welfare service? I have interviewed ten different foster parents from eight different families regarding their experience with child welfare services. The research material has been constructed and analyzed using a qualitative method with emphasizes on the concepts positioning and negotiations. Negotiation was a premise for the research project and is an overall analytical perspective. The study shows that there is a variation in foster parents experiences of cooperation with the child welfare services. Furthermore, the study shows the dynamic factor in this cooperation by positions that change with contextual change. Additionally, the study shows that also the foster parents plays a role in achieving their positions in the relationship. Different positions leads to different forms of negotiation. These negotiations indicate the fact that interpretations are not static, but in continuous change. The foster parents negotiate both with themselves and the child welfare employees regarding how to interpret and understand incidents that happens. I have also taken a closer look at the two terms competency and supervising in my study. They are two crucial areas in the relationship and cooperation between foster parents and child welfare. My research shows that foster parents see it as important that the child welfare employee has knowledge about the child under custody and/or the foster family where the child is under custody. According to the foster parents interviewed, this knowledge is considered the most important in the employee’s competency level. Foster parents see themselves as equally knowledgeable about the children as a child welfare official. Furthermore, the study shows that foster parents consider child welfare employees as competent in situations where the employees acknowledge foster parents as the ones who know the foster child the best and communicate with the foster parents about what the child 8 needs, in addition to doing their official tasks. Foster parents don’t necessary expect that the officials should be subject matter experts about children in general, but instead take necessary steps to get in touch with other services when and if the child shows sign of abnormal behavior. The foster parents in this study initially understand supervising as advice of how to behave in specific situations with the child. However, during the interviews I experienced that the foster parents began to reflect more about the content of the term itself, and that their interpretation of supervising was readjusted to a deeper understanding of the term. The study shows that supervising is about being able to reflect on situations and experiences with another person who is able to see things from the foster parents’ perspective.Master i sosialt arbei

A Trend for Increased Risk of Revision Surgery due to Deep Infection following Fast-Track Hip Arthroplasty

Rates of revision surgery due to deep infection following total hip arthroplasty (THA) increased at a Norwegian hospital following implementation of fast-track procedures. The purpose of this study was to determine whether selected demographic (age and sex) and clinical (body mass index, American Society of Anesthesiologists (ASA) classification, surgery duration, length of hospital stay, cemented versus uncemented prosthesis, and fast-track procedures) factors were associated with higher risk of revision surgery due to deep infection following THA. In a prospective designed study 4,406 patients undergoing primary THA between January 2001 and January 2013 where included. Rates of infection-related revision surgery within 3 months of THA were higher among males and among patients who received fast-track THA. Adjusting for sex and age, the implemented fast-track elements were significantly associated with increased risk of revision surgery. Risk of infection-related revision surgery was unrelated to body mass index, physical status, surgery duration, length of hospital stay, and prosthesis type. Because local infiltration analgesia, drain cessation, and early mobilization were introduced in combination, it could not be determined which component or combination of components imposed the increased risk. The findings in this small sample raise concern about fast-track THA but require replication in other samples

Identifying prostate cancer and its clinical risk in asymptomatic men using machine learning of high dimensional peripheral blood flow cytometric natural killer cell subset phenotyping data

We demonstrate that prostate cancer can be identified by flow cytometric profiling of blood immune cell subsets. Herein, we profiled natural killer (NK) cell subsets in the blood of 72 asymptomatic men with Prostate-Specific Antigen (PSA) levels < 20 ng ml-1, of whom 31 had benign disease (no cancer) and 41 had prostate cancer. Statistical and computational methods identified a panel of eight phenotypic features (CD56dimCD16high, CD56+DNAM−1−, CD56+LAIR−1+, CD56+LAIR−1−, CD56brightCD8+, CD56+NKp30+, CD56+NKp30−, CD56+NKp46+) that, when incorporated into an Ensemble machine learning prediction model, distinguished between the presence of benign prostate disease and prostate cancer. The machine learning model was then adapted to predict the D’Amico Risk Classification using data from 54 patients with prostate cancer and was shown to accurately differentiate between the presence of low-/intermediate-risk disease and high-risk disease without the need for additional clinical data. This simple blood test has the potential to transform prostate cancer diagnostics