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HCCI (Homogeneous Charge Compression Ignition) is a very control-intensive combustion concept which has been studied for over a decade because of its favorable combination of high efficiency and low emissions. Various optimal control methods have been applied to HCCI and this chapter gives an overview of them. Optimal control of HCCI can be divided into model based and non-model based where MPC is
Partially premixed combustion is a compression ignited combustion strategy where high exhaust gas recirculation (EGR) levels in combination with early or late injection timing result in a prolonged ignition delay yielding a more premixed charge than with conventional diesel combustion. With this concept it is possible to get low smoke and NOx emissions simultaneously. Accurate control of injection
Previous research carried out by the authors described the role of dual-fuel combustion efficiency on overall engine efficiency at high diesel substitution ratio. At low loads, high diesel substitution ratios result in excessive total unburned hydrocarbon emissions due to bulk flame quenching, and consequently lower substitution ratios in combination with intake air heating, throttling and increas
The effects of fuel properties on the performance and emissions of an engine running in partially premixed combustion mode were investigated using nine test fuels developed in the gasoline boiling point range. The fuels covered a broad range of ignition quality and fuel chemistry.The fuels were characterized by performing a load sweep between 1 and 12 bar gross IMEP at 1000 and 1300 rpm. A heavy d
Extreme weather events like floods are expected to become more common asclimate change continues, putting health at risk. Systems should be able tocontinue delivering essential health services when shocked by events like floodsand provide care for the expected new health needs caused by the shock.Resilient health systems have the capacity to maintain their functions and tochange when shocked, enab
Active pre-chamber configurations are considered a valuable solution for improving the operation of the internal combustion engine, in the view to overcome the many challenges it has been made to face. Combining this technology with the use of natural gas, a fuel that has increasing availability and interest in the market share, it is possible to burn ultra-lean mixtures (with air-to-fuel ratios,
Purpose: The research community has focused on defining reliable biomarkers for the early detection of the pathological hallmarks of Alzheimer’s disease (AD). In 2017, the Geneva AD Biomarker Roadmap initiative adapted the framework for the systematic validation of oncological biomarkers to AD, with the aim to accelerate their development and implementation in clinical practice. The aim of this wo
Additions B and E to LXX Esther have been variously dated from the second century BCE to the first century CE. This study links the two Greek Additions, on the one hand, with Philo’s writings through the concept of the “evil-hating justice” and, on the other hand, with the historical persons and events related to the Jewish-Alexandrian conflict of 38-41 CE, and dates their composition or final red
A search for heavy resonances decaying into a W or Z boson and a Higgs boson produced in proton-proton collisions at the Large Hadron Collider at s=13 TeV is presented. The analysis utilizes the dominant W→qq¯′ or Z→qq¯ and H→bb¯ decays with substructure techniques applied to large-radius jets. A sample corresponding to an integrated luminosity of 139 fb-1 collected with the ATLAS detector is anal
This investigation concerns written output produced by Swedish learners of English as a second language (L2) and French as a third language (L3). The analysed texts were rated according to the Common European Framework of Reference for Languages (CEFR), which is a widespread and language-independent document commonly used to assess communicative competence based on six main proficiency levels (A1,
In Sweden, the food and agricultural sector is highly concentrated, especially in the food refinement and retail sectors, with a few major actors holding significant market power. This concentration poses challenges for smaller agri-food companies in Skåne, Sweden. This thesis aims to in depth exploring the challenges smaller agri-food companies face today. The thesis employs a case study approach
The aim of this paper is to examine the media coverage of Antena 3 on the anti-lockdown protests that took place on 2 October 2021 in Bucharest, Romania, as a way of understanding the impact on the public narratives and political discourse of the employment of conspiracy theories by the media. By exploring the allure, politicization, and mentality of conspiracy theories, along with utilizing disc
The situation for the environment is in many ways dire. However, amidst all the negative environmental developments it is easy to neglect the successes that have actually happened. With the aim of better understanding what factors facilitated such a success this thesis analyses one such case, namely emissions of dioxins and chlorinated waste from the pulp and paper industry in Sweden. Dioxins were
Studier av palaeostormfloder ger bakgrund till inom vilka intevall stormar av olika storlek förväntas återkomma och träffa olika områden. Denna information kan användas vid modellering, riskbedömning och stadsplanering. Genom att använda de marina ekvationerna av Nittrouer och Sternberg (1981; The formation of sedimentary strata in an allochthonous shelf environment: the Washington continental sheStudies of palaeostorm surges provides background into at what frequencies storms of different magnitudes are expected to return and hit different areas. This information can be used when modelling, doing risk assesments and city planing. Using the marine equations of Nittrouer and Sternberg (1981; The formation of sedimentary strata in an allochthonous shelf environment: the Washington continenta
Acute respiratory distress syndrome (ARDS) is a life-threatening condition with mortality rates between 30-50%. Although in vitro models replicate some aspects of ARDS, small and large animal models remain the primary research tools due to the multifactorial nature of the disease. When using these animal models, histology serves as the gold standard method to confirm lung injury and exclude other
