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The entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes was numerically performed by using a Reynolds stress model. The simulations were conducted for a smooth tube and five cases of corrugated tubes with Reynolds number (Re) ranging from 10,020 to 40,060 at a constant wall temperature condition. The effects of corrugation pitch and heig
The main aim of the present thesis is to demonstrate the efficient quantum memories for light employing coherent processes in rare-earth-ion-doped crystals. Rare-earth (RE) ions between lanthanum, with atomic number 57, and lutetium, with atomic number 71, have a partly filled 4f shell, which is spatially inside the full shells 5s, 5p, and 6s. Therefore, 4f-4f transitions are shielded from environ
We have used density functional methods to calculate fully relaxed potential energy curves of the seven lowest electronic states during the binding of O-2 to a realistic model of ferrous deoxyheme. Beyond a Fe-O distance of similar to 2.5 Angstrom, we find a broad crossing region with five electronic states within 15 kJ/mol. The almost parallel surfaces strongly facilitate spin inversion, which is
The lean stability limit of a prototype syngas burner is investigated. The burner is a three sector system, consisting of a separate igniter, stabilizer and Main burner. The ignition sector, Rich-Pilot-Lean (RPL), can be operated with both rich or lean equivalence values, and serves to ignite the Pilot sector which stabilizes the Main combustion sector. The RPL and Main sectors are fully premixed,
Green Hydrogen has been hailed as a game changer in climate actions, yet both global hydrogen markets and governance frameworks remain underdeveloped. The EU aims to pioneer a regulatory pathway, embedding hydrogen into its decarbonization governance framework. Centered on renewable hydrogen, the EU moves beyond “color-coding” technical classifications towards an emission-intensity-based legal def
Professor Contact details Email: leif [dot] lonnblad [at] fysik [dot] lu [dot] se Phone: +46 46 222 77 80Organisation Particle and nuclear physics Visiting address: Sölvegatan 14A, Lund Room number: K233 Service point: 14 WebpageLeif Lönnblads profile in Lund University research portalResearchQCD Phenomenology and Monte Carlo Event Generators.TeachingTheoretical Particle Physics (FYTN18) and (Expl
https://www.particle-nuclear.lu.se/leif-lonnblad - 2026-07-02
Dr. Abu Sebastian, IBM Research – Zurich, ZwitzerlandNanoscience Colloquium entitled "Brain-inspired Computing using Phase Change Memory Devices" Abstract: There is a significant need to build efficient non-von Neumann computing systems for highly data-centric artificial intelligence related applications. Brain-inspired computing is one such approach that shows significant promise. Memory is expe
https://www.nano.lu.se/abstract-brain-inspired-computing-using-phase-change-memory-devices-abu-sebastian-ibm-research - 2026-07-01
In 2024, Jennifer moved from Sydney, Australia to Lund, Sweden to start her PhD studies at the TNU, supervised by Pof. Åsa Petersén. In utilizing novel AAV-vectors and crossbreeding of animal models, Jennifer’s project aims to elucidate the specific hypothalamic circuitries important for the control of metabolism and emotion, with relevance to Huntington’s Disease, Amyotrophic Lateral Sclerosis an
https://www.huntington-research.lu.se/team/jennifer-oraha-phd-student - 2026-07-01
We present high-order harmonic generation results obtained with different laser systems a 1 ps 1053 nm Nd-glass laser a 2 ps 616 nm synchronously pumped dye laser a 36 ps 1064 nm mode-locked Nd-YAG laser and the second harmonics (308 nm and 532 nm) of the latter two systems. We investigate the influence of the laser pulse width the excitation wavelength (from the near infrared to the ultraviolet)
Using spectra of RR Lyrae stars in the Small Magellanic Cloud (SMC) a metallicity snapshot from an early epoch in the history of the SMC could possibly be obtained. The SMC, one of our closest neighbours in the Local Group of galaxies, offers the opportunity to study another galaxy close-up. The history of the SMC can be traced using the chemical characteristics of its different generations of sta
The bifunctional dCTP deaminase-dUTPase (DCD-DUT) from Methanocaldococcus jannaschii catalyzes the deamination of the cytosine moiety in dCTP and the hydrolysis of the triphosphate moiety forming dUMP, thereby preventing uracil from being incorporated into DNA. The crystal structure of DCD-DUT has been determined to 1.88-Å resolution and represents the first known structure of an enzyme catalyzing
Phospholipid metabolism, including phosphatidylcholine (PC) biosynthesis, is crucial for various biological functions and is associated with longevity. Phosphatidylethanolamine N-methyltransferase (PEMT) is a protein that catalyzes the biosynthesis of PC, the levels of which change in various organs such as the brain and kidneys during aging. However, the role of PEMT for systemic PC supply is not
In the coming renewables-based energy transition, global electricity consumption is expected to double by 2050, entailing widespread end-use electrification, with significant impacts on energy efficiency. We develop a long-run, worldwide societal exergy analysis focused on electricity. Our 1900–2017 electricity world database contains the energy carriers used in electricity production, final end-u
This project aims to study wide angle scattering events at LDMX through simulation. LDMX is a fixed target experiment searching for missing momentum of the beam electrons to identify dark matter signals. It consists of a tracking system around the thin tungsten target placed in a 1.5 T magnetic field, to measure the momentum of electrons before and after the target, and calorimeters (electromagnet
Gas engines (fuelled with CNG, LNG or Biogas) for generation of power and heat are, to this date, taking up larger shares of the market with respect to diesel engines. In order to meet the limit imposed by the TA-Luft regulations on stationary engines, lean combustion represents a viable solution for achieving lower emissions as well as efficiency levels comparable with diesel engines. Leaner mixt
