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A single zircon grain dated by ion probe with a minimum age of 3432±30 Ma was found in a microgranite dyke, which cuts norite of 916±11 Ma Hakefjorden Complex at Älgön on the Swedish west coast north of Gothenburg. Zircons are a rare accessory mineral in this dyke. They could be classified by morphology as orthocrysts and xenocrysts. Data from four orthocrysts show that the dyke originated between

It has been known from multi-zone simulations that HCCI combustion can be significantly affected by temperature stratification of the in-cylinder gas. With the same combustion timing (i.e., crank angles at 50% heat release, denoted as CA50), large temperature stratification tends to prolong the combustion duration and lower down the in-cylinder pressure-rise-rate. With low pressure-rise-rate HCCI

Popular Abstract in Swedish Denna avhandling handlar om modeller för plana solfångare, transparent isolering och verkningsgradsfaktorer. En ekvation för energiutbytet från en glasad plan solfångare härleds genom att modellera verkningsgradsfaktorn, F´, som en summa av en konstant och en temperaturberoende del. Ett alternativt sätt att testa en plan solfångare, baserat på denna modell, föreslås. EThis thesis deals with models of flat plate collectors, transparent insulation and efficiency factors. An equation for the energy output from a glazed flat plate collector is derived by modelling the collector efficiency factor, F´ as the sum of a constant and a temperature dependent part. An alternative way of testing a flat plate collector, based on this model, is suggested. A complete set of a

Recent experiments and numerical studies have showed that piston geometry has a significant effect on the homogeneous charge compression ignition (HCCI) process. There are two effects generated by the combustor geometry: the geometry affects the flow/turbulence in the cylinder; the geometry also affects the temperature stratification. The temperature stratification is more directly responsible for

Ribbed channel flows are encountered in numerous engineering applications to promote turbulence and enhance heat transfer in various cooling passages, e.g., in turbine blades and at combustor walls. Numerical simulations have become an increasingly useful tool for studying the behavior of fluids in rib-roughened channels to provide insights into the complex turbulence structures and flow separatio

BIOM02, BION02, BION03 You can perform a master's degree project in biology, if you are enrolled in the Master´s program in Biology at Lund University, and have completed 45 credits of relevant advanced level courses within the programme (specific for each specialisation). Students on the master's programme in Biology usually take courses the first year of the Master'enroll for the project during

https://www.biologyeducation.lu.se/education/courses/degree-projects/biology-masters-degree-project - 2026-05-29

Peatland trees are valuable archives of paleoclimatic information; however, gaps persist in understanding the relationships between tree growth, peatland hydrology, and hydroclimate variables. While previous research in peatlands has mainly focused on tree-ring widths (TRW), yielding inconclusive results, the potential of stable carbon (δ13C) and oxygen (δ18O) isotopes in tree rings remains unexpl

Abstract in Italian Negli ultimi trent’anni il sindacato ha iniziato a perdere valenza sotto il profilo nazionale, questo soprattutto a causa del declino degli iscritti a tali organizzazioni. Declino che ha interessato, bene o male, tutti i paesi occidentali, dall’Europa agli Stati Uniti d’America. Ciononostante (o proprio per questo), gli studiosi delle relazioni industriali e della sociologia de

https://www.lu.se/sites/www.lu.se/files/eche_2014_awardedapplications.xlsx - 2026-05-31

Background Increased cancer risk after psoriasis has been observed in previous studies, whereas little is known about the prognosis in cancer patients with previously diagnosed psoriasis. Objectives We aimed at examining the cancer-specific and overall mortality among psoriatic cancer patients compared with the reference population. Methods The population-based Swedish registers were used to ident

https://www.sol.lu.se/media/utbildning/dokument/kurser/FRAB12/20261/FRAB12.pdf - 2026-05-30

An experimental and numerical study on mechanical properties, such as strength, elastic modulus, creep and shrinkage, of Self-Compacting Concrete, SCC, and the corresponding properties of Normal Compacting concrete, NC, is outlined in this article. The study included eight mix proportions of sealed or air-cured specimens with water-binder ratio, w/b, varying between 0.24 and 0.80. Half of the mixe

Popular Abstract in Swedish Vår forskningsgrupp har tidigare påvisat kraftiga förändringar i genuttryck för neurotrofiner, en familj av tillväxtfaktorer för nervceller, och deras receptorer i kortikala och hippokampala nervceller vid olika hjärnskador. Det är till stora delar okänt vilken funktion neurotrofiner har efter hjärnskador, men neurotrofinsvaret skulle kunna vara en skyddande mekanism ocThis study explores the role of brain-derived neurotrophic factor (BDNF) for neuronal vulnerability and neurogenesis following cerebral ischemia in the rat. Cerebral ischemia results in selective neuronal cell loss in specific brain regions. We here demonstrate the rank order of vulnerability in two regions affected by global forebrain ischemia, i.e., hippocampus and striatum, by combining specifi