Search results

Filter

Filetype

Your search for "*" yielded 535014 hits

Investigation of Different Valve Geometries and Valve Timing Strategies and their Effect on Regenerative Efficiency for a Pneumatic Hybrid with Variable Valve Actuation

In the study presented in this paper a single-cylinder Scania D12 diesel engine has been converted to work as a pneumatic hybrid. During pneumatic hybrid operation the engine can be used as a 2-stroke compressor for generation of compressed air during vehicle deceleration and during vehicle acceleration the engine can be operated as an air-motor driven by the previously stored pressurized air.The

Obesity and metabolic disturbances in adamantinomatous craniopharyngioma patients

An adamantinous craniopharyngioma (CP) is rare benign pituitary tumour often growing invasively and thereby affecting the hypothalamus. The recurrence rate in CP is high and therapy of choice is surgery, followed by cranial radiotherapy (CRT) in about half of the patients. Patients with CP have a 3-19 fold higher cardiovascular mortality in comparison to the general population. The majority of pat

Investigation of the Combustion Characteristics with Focus on Partially Premixed Combustion in a Heavy Duty Engine

Partially Premixed Combustion (PPC) has shown its potential by combining high combustion controllability with emission characteristics that are close to those of an HCCI engine. In order to get PPC the ignition delay needs to be long enough for the fuel and air to mix prior to combustion. This can be achieved by injecting the fuel sufficiently early while running with high EGR.In order to find outPartially Premixed Combustion (PPC) has shown its potential by combining high combustion controllability with emission characteristics that are close to those of an HCCI engine. In order to get PPC the ignition delay needs to be long enough for the fuel and air to mix prior to combustion. This can be achieved by injecting the fuel sufficiently early while running with high EGR.In order to find out

IDAC-Dose 2.1, an internal dosimetry program for diagnostic nuclear medicine based on the ICRP adult reference voxel phantoms

Background: To date, the estimated radiation-absorbed dose to organs and tissues in patients undergoing diagnostic examinations in nuclear medicine is derived via calculations based on models of the human body and the biokinetic behaviour of the radiopharmaceutical. An internal dosimetry computer program, IDAC-Dose2.1, was developed based on the International Commission on Radiological Protection

Sensitivity Analysis of Partially Premixed Combustion (PPC) for Control Purposes

Partially Premixed Combustion (PPC) is a promising advanced combustion mode for future engines. In order to investigate the sensitivity of PPC to exhaust gas recirculation (EGR) rate, intake gas temperature, intake gas pressure, and injection timing, these parameters were swept individually at three different loads in a single cylinder diesel engine with gasoline-like fuel.A factor of sensitivity

Gender aspects on exercise-induced ECG changes in relation to scintigraphic evidence of myocardial ischaemia

Background: This retrospective study aimed to determine the diagnostic performance of exercise-induced ST response in relation to findings by myocardial perfusion single photon emission computed tomography (MPS), with focus on gender differences, in patients with suspected or established stable ischemic heart disease. Methods: MPS findings of 1 021 patients (518 females) were related to the exerci

Lactate improves SAPS 3 prognostication

Introduction: Lactate concentration is known to be a strong predictor of mortality, but is not included in any of the major intensive care scorings systems such as the Simplified Acute Physiology Score (SAPS 3). The objective of this study was to investigate the prognostic value of lactate concentration when combined with SAPS 3. Materials and methods: In the period of 2008 to June 2017 the genera

Multi Cylinder Partially Premixed Combustion Performance Using Commercial Light-Duty Engine Hardware

This work investigates the performance potential of an engine running with partially premixed combustion (PPC) using commercial diesel engine hardware. The engine was a 2.01 SAAB (GM) VGT turbocharged diesel engine and three different fuels were run - RON 70 gasoline, RON 95 Gasoline and MK1 diesel. With the standard hardware an operating range for PPC from idle at 1000 rpm up to a peak load of 10

Untargeted antifungal therapy in adult patients with complicated intra-abdominal infection : A systematic review

Background: Systematic reviews comparing untargeted antifungal treatment with placebo or no treatment in critically ill patients have provided conflicting results. We aimed to assess patient-important benefits and harms of untargeted antifungal therapy vs. placebo or no treatment in adult patients with complicated intra-abdominal infection. Methods: We conducted a systematic review with meta-analy

An In-Cycle based NOx Reduction Strategy using Direct Injection of AdBlue

In the last couple of decades, countries have enacted new laws concerning environmental pollution caused by heavy-duty commercial and passenger vehicles. This is done mainly in an effort to reduce smog and health impacts caused by the different pollutions. One of the legislated pollutions, among a wide range of regulated pollutions, is nitrogen oxides (commonly abbreviated as NOx). The SCR (SelectIn the last couple of decades, countries have enacted new laws concerning environmental pollution caused by heavy-duty commercial and passenger vehicles. This is done mainly in an effort to reduce smog and health impacts caused by the different pollutions. One of the legislated pollutions, among a wide range of regulated pollutions, is nitrogen oxides (commonly abbreviated as NOx). The SCR (Select

Orellanine specifically targets renal clear cell carcinoma

Renal cell carcinoma (RCC), arising from the proximal tubule in the kidney, accounts for approximately 85% of kidney cancers and causes over 140,000 annual deaths worldwide. In the last decade, several new therapies have been identified for treatment of metastatic RCC. Although these therapies increase survival time compared to standard care, none of them has curative properties. The nephrotoxin o

Role of interferons in SLE

Systemic lupus erythematosus (SLE) is a chronic inflammatory autoimmune disease that affects many different organ systems, with excessive production of type I interferons (IFNs) and autoantibodies against nucleic acids as hallmarks. Activation of the type I IFN system in SLE is due to continuous stimulation of plasmacytoid dendritic cells by endogenous nucleic acids, leading to sustained type I IF

Steady state fuel consumption optimization through feedback control of estimated cylinder individual efficiency

Engine efficiency is often controlled in an indirect way through combustion timing control. This requires a priori knowledge of where to phase the combustion for different operating points and conditions. With cylinder individual efficiency estimation, control strategies aiming directly at fuel consumption optimization can be developed. It has previously been shown that indicated efficiency can beEngine efficiency is often controlled in an indirectway through combustion timing control. This requires a prioriknowledge of where to phase the combustion for differentoperating points and conditions. With cylinder individual efficiencyestimation, control strategies aiming directly at fuelconsumption optimization can be developed. It has previouslybeen shown that indicated efficiency can be estim

Engaging Students using GitHub as a Learning Management System

Student engagement is an important factor when it comes to the learning process. Students who do not feel engaged in their studies risk surface learning, are more likely to fail their exams and might even drop out of their education. The teaching community has tried different methods in order to increase student engagement. One of them is the Contributing Student Pedagogy (CSP), where students con

Improvisational approaches to supervision dialogue

The reflective processes in which supervisors and doctoral students indulge together may be improvisatory to an important extent. Based on a literature review and a small interview study, I argue that there are important similarities between musical improvisation and supervision dialogue regarding, for instance, the need for structure as well as continuous impulse fluidity, and the need for recept