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This paper investigates the aeroacoustic properties of dual-stream co-axial supersonic jets, focusing on sound generation at the engine nozzle exit, which significantly contributes to cabin noise in supersonic civil aviation. The study delves into three primary noise-generating mechanisms present in supersonic jets: broadband shock-associated noise, jet screech, and turbulent mixing noise. While s
Migration can influence host–parasite dynamics in animals by increasing exposure to parasites, by reducing the energy available for immune defense, or by culling of infected individuals. These mechanisms have been demonstrated in several comparative analyses; however, few studies have investigated whether conspecific variation in migration distance may also be related to infection risk. Here, we a
Popular Abstract in English Among the forms of life found in extreme environments (e.g. high temperatures ‘thermo’ and oxygen deficient ‘anaerobe’), the thermoanaerobic bacteria emerge as a highly evolved and interesting subject of study. Bacteria living as microbial mats in decaying plant material possess a great potential not only to degrade complex biomass but also to produce special chemicals.A novel ethanol-producing thermoanaerobe Caloramator boliviensis 45BT (=DSM 22065T, =CCUG 57396T) was isolated from a hot spring of the Bolivian highlands. C. boliviensis possesses the ability to utilize a wide range of substrates and can efficiently convert hexoses and pentoses into ethanol with concomitant production of acetate, carbon dioxide and hydrogen as by-products of fermentation. However
Popular Abstract in Swedish Ett antal optiskt aktiva metalloorganiska Phe-AAn-Phe subenheter har syntetiserats via intramolekulär cyklisering av motsvarande bis(aminosyra)derivat. Bis(aminosyra)derivaten var i sin tur erhållna från en förbättrad multistegssyntes, vars nyckelsteg är Horner-Wadswort-Emmons olefinering av metalloorganiska aldehyder med fosfonylglycin-reagens, enantioselektiv hydrogenSeveral optically active organometallic Phe-AAn-Phe peptidomimetics and macrocyclic Phe-(Phe)n peptides have been synthesized by either intra- or intermolecular peptide bond formation of the corresponding bis(amino acid) derivatives. The key bis(amino acid) derivatives were available from an improved multi-step synthetic route, utilising Horner-Wadswort-Emmons olefination of organometallic aldehyd
Solid oxide fuel cells (SOFCs) are promising as energy producing device, which at this stage of its development will require extensive analysis and benefit from numerical modeling at different time-and length scales. In this study, two models based on finite element method (FEM) and Lattice Boltzmann model (LBM), respectively, are evaluated and compared for an anode-supported SOFC. First, a 3D mod
Bottom-up strategies can be effectively implemented for the fabrication of atomically precise graphene nanoribbons. Recently, using 10,10'-dibromo-9,9'-bianthracene (DBBA) as a molecular precursor to grow armchair nanoribbons on Au(111) and Cu(111), we have shown that substrate activity considerably affects the dynamics of ribbon formation, nonetheless without significant modifications in the grow
Two new pentadentate {N5} donor ligands based on the N4Py (N4Py = N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methylamine) framework have been synthesized, viz. [N-(1-methyl-2-benzimidazolyl)methyl-N-(2-pyridyl)methyl-N-(bis-2-pyridyl methyl)amine] (L1) and [N-bis(1-methyl-2-benzimidazolyl)methyl-N-(bis-2-pyridylmethyl)amine] (L2), where one or two pyridyl arms of N4Py have been replaced by correspon
To help meet emission standards, hydrogen sulfide (H2S) from geothermal production may be injected back into the subsurface, where basalt offers, in theory, the capacity to mineralize H2S into pyrite. Ensuring the viability of this pollution mitigation technology requires information on how much H2S is mineralized, at what rate and where. To date, monitoring efforts of field-scale H2S reinjection
The human brain performs tasks with an outstanding energy efficiency, i.e., with approximately 20 Watts. The state-of-the-art Artificial/Deep Neural Networks (ANN/DNN), on the other hand, have recently been shown to consume massive amounts of energy. The training of these ANNs/DNNs is done almost exclusively based on the back-propagation algorithm, which is known to be biologically implausible. Th
As greenhouse gas emissions are becoming a source of concern renewable fuels are becoming more and more interesting. Methanol is one such fuel. The main benefit of methanol is that it can be produced in two potentially carbon neutral ways. It can be produced from many sources of biomass, including wood, which makes it attractive in Sweden. In a long-term perspective it can also be produced from el
It is increasingly well-established that Homo sapiens’ significant influence and success as a species are due to our ability to cooperate – solving collective action problems. The evolutionary selection for this ability can be explained by the cumulative effect of cultural technologies and practices being imitated within the group and between generations. To gain new insight into the human evoluti
The rising levels of greenhouse gas emissions, especially of carbon dioxide, imposes a significant threat to the world, requiring new decarbonisation technologies. This thesis explores integrating a Power to X system with an existing biogas plant utilizing waste from salmon fishery. Three pathways for upgrading biogas to methanol or methane were investigated: (P1) direct carbon dioxide to methanol
Renewable energy expansion and carbon sink enhancement are central to developing sustainable climate pathways, yet the rapid deployment of renewable energy technologies is intensifying land-use competition and increasing the need for more resource-efficient siting strategies. Solar development on former peat extraction sites represents one such approach, as it enables the use of degraded land whil
A biohythane process based on wheat straw including: i) pretreatment, ii) H2 production using Caldicellulosiruptor saccharolyticus, iii) CH4 production using an undefined consortium, and iv) gas upgrading using an amine solution, was assessed through process modelling including cost and energy analysis. According to simulations, a biohythane gas with the composition 46–57% H2, 43–54% CH4 and 0.4%
We report on an experimental demonstration of spatially-resolved detection of atomic hydrogen in flames using a single-ended configuration yielding 656-nm lasing in the backward direction upon 2-photon pumping with 205-nm femtosecond laser pulses. Spatial resolution is achieved by temporally-resolved detection of the backward lasing using a streak camera. The method is demonstrated in CH4/O2 flame
Microsoft Word - Gohar Astvatsatryan.doc Gohar Astvatsatryan Master Thesis LUMES 1998/99 1 Lund, Sweden TABLE OF CONTENT ABSTRACT……………………………………………………………………………. 3 ACRONYMS ………………………………………………………………………….. 3 CHAPTER I: INTRODUCTION………………………………………………… 4 1.1. BACKGROUND: TOURISM AND SUSTAINABLE DEVELOPMENT……….. 4 1.2. GOALS AND OBJECTIVES…………………………………..………………… 5 1.3. SCOPE AND LIMITATIONS………………………………………
https://www.lumes.lu.se/sites/lumes.lu.se/files/astvatsatryan_gohar.pdf - 2026-07-10
Popular Abstract in Swedish Transportsektorn står för 63% av Sveriges använding av kol, olja och gas. Biobränslen som etanol, biodiesel och biogas står bara för 6.8% av energin som används för nationella transporter, biogas står för 12% av detta. Ökad produktion av biobränslen för transproter behöver inte betyda minskad produktion av jordbruks- och skogsråvaror för annat. Dels kan restprodukter anBiofuels are currently produced from agricultural crops, and an increasing use of crops for this application is expected in the EU in the years to come. The dominating crops cultivated in the EU for biofuel production today have a relatively large environmental impact. The European Energy Agency has identified several lignocellulosic crops, including industrial hemp, as more sustainable potential
Universitetslektor Kontaktinformation E-post: patrik [dot] eden [at] mgeo [dot] lu [dot] seOrganisation Miljö- och geovetenskapliga institutionen (MGeo) Hämtställe: 16 WebbplatsPatrik Edéns profil i Lunds universitets forskningsportalAndra roller Medlem i Strategiskt forskningsområde eSSENCE: The e-Science CollaborationForskningsprofil: Beräkningsvetenskap, artificiella neuronnätverk, maskininlärn
https://www.cec.lu.se/sv/patrik-eden - 2026-07-09
This paper presents a detector developed to protect the ESS spallation target. The detector is installed to receive a proton beam that has a peak current of 62.5 mA, an average power of 5 MW, and energy up to 2 GeV. It is designed to detect any part of the proton beam that goes outside a defined aperture, which is deemed as an errant beam condition. This detector is mainly used for machine protect
