1.1 689 info:srw/schema/1/mods-v3.3xml journalArticle published yes 5 M. Fisk author J. Andersson author R. du Rietz author Sylvio Haas author b4b5ac47-eb2c-44e9-a223-3c6876b3fb3f Stephen Hall author a88b779b-533c-4903-9de0-ecde29c1963e MAX IV Laboratory v1000329 department Solid Mechanics v1000231 department eSSENCE: The e-Science Collaboration v1001240 department Microstructural evolution during the early stages of ageing (less than one hour) in a Ni-Cr-Fe based superalloy Inconel 718 (IN718) has been investigated using Small-Angle X-ray Scattering (SAXS). The effects of precipitate kinetics on the precipitate size distribution are compared indirectly with SAXS measurements by using Vickers microhardness data. The microhardness increased after 4 min of ageing at a temperature of 760 degrees C, although the recorded SAXS data did not reveal the precipitate size distribution. This indicates that the precipitates had not evolved enough to be detected, but still a small number of precipitates increased the yield strength. After ageing the alloy for the shortest period for which data were available, 8 min, clear evidence of precipitates could be found from the SAXS data, showing that the gamma '' - precipitates are about 6 nm in width and 3 nm in height. (C) 2014 Elsevier B.V. All rights reserved. https://portal.research.lu.se/en/publications/383c4306-1b53-4140-b790-49e378ad6c90 Elsevier 2014 eng Nucleation SAXS Vickers microhardness Nickel based superalloys Age hardening IN718 Physical Sciences Mechanical Engineering Natural Sciences 1873-4936 4656267 000340331300025 84903696081 10.1016/j.msea.2014.06.036 http://dx.doi.org/10.1016/j.msea.2014.06.036 yes 612 202 207 https://www.scopus.com/pages/publications/84903696081 383c4306-1b53-4140-b790-49e378ad6c90 2016-04-01T09:48:05+02:00 2025-10-14T12:45:16+02:00 2016-04-01T09:48:05+02:00 1 info:srw/schema/1/mods-v3.3xml conference paper published yes 3 Anders Sjöström author 4a2e9a11-8db0-47b0-ab0d-5bfb2679b2dd Jonas Lindemann author 55a2d39e-aaec-494f-b1a8-b8bd0601fa5e Ross Church author 1c71e6db-e317-451d-8e29-847b94cb39c9 Structural Mechanics v1000228 department Lund Observatory v1000643 department Conference on Integrated Modeling of Complex Optomechanical Systems To meet the ever increasing demand for computational speed and use of ever larger datasets, multi GPU installations look very tempting. Lunarc and the Theoretical Astrophysics group at Lund Observatory collaborate on a pilot project to evaluate and utilize multi-GPU architectures for scientific calculations. Starting with a small workshop in 2009, continued investigations eventually lead to the procurement of the GPU-resource Timaeus, which is a four-node eight-GPU cluster with two Nvidia m2050 GPU-cards per node. The resource is housed within the larger cluster Platon and share disk-, network-and system resources with that cluster. The inauguration of Timaeus coincided with the meeting "Computational Physics with GPUs" in November 2010, hosted by the Theoretical Astrophysics group at Lund Observatory. The meeting comprised of a two-day workshop on GPU-computing and a two-day science meeting on using GPUs as a tool for computational physics research, with a particular focus on astrophysics and computational biology. Today Timaeus is used by research groups from Lund, Stockholm and Lule in fields ranging from Astrophysics to Molecular Chemistry. We are investigating the use of GPUs with commercial software packages and user supplied MPI-enabled codes. Looking ahead, Lunarc will be installing a new cluster during the summer of 2011 which will have a small number of GPU-enabled nodes that will enable us to continue working with the combination of parallel codes and GPU-computing. It is clear that the combination of GPUs/CPUs is becoming an important part of high performance computing and here we will describe what has been done at Lunarc regarding GPU-computations and how we will continue to investigate the new and coming multi-GPU servers and how they can be utilized in our environment. https://portal.research.lu.se/en/publications/38c9a19e-fc6d-447d-ab30-cfd7e1cd6a31 SPIE 2011 2011-08-15 - 2011-08-17 Kiruna, Sweden eng GPU LUNARC PARALLELIZATION PARALLEL TOOLBOX MATLAB CUDA Mechanical Engineering Astronomy, Astrophysics and Cosmology 0277-786X 1996-756X 2493915 000297925400035 84255162449 10.1117/12.915780 http://dx.doi.org/10.1117/12.915780 yes 8336 83360 83360 https://www.scopus.com/pages/publications/84255162449 38c9a19e-fc6d-447d-ab30-cfd7e1cd6a31 2016-04-01T09:48:22+02:00 2026-01-14T05:02:06+01:00 2016-04-01T09:48:22+02:00 2 info:srw/schema/1/mods-v3.3xml journalArticle published yes 5 Patrik Lundin author c0aa7064-1c09-4e72-bf2a-5878c57237b5 Lorenzo Cocola author 190304ad-8fc1-49ba-a2dc-a8efd1fa5ab0 Märta Lewander author 909f784d-3969-4f58-962f-ecb071498c60 Annika Olsson author c98a031c-5cca-40c6-8133-9e410a9bb9d4 Sune Svanberg author 6c4fbfa4-9292-434b-b63d-9dcd5771412a Atomic Physics v1000622 department Packaging Logistics v1000238 department Lund Laser Centre, LLC v1000184 department Abstract in Undetermined<br/>The oxygen concentration in the headspace of a large number of liquid food containers is assessed with non-intrusive diode laser absorption spectroscopy. The results are compared to those given by a traditional intrusive measurement method. The upper portions of the containers are made of translucent but non-transparent plastic materials, through which the laser light is diffusively transmitted. Measurements are performed both on packages with modified atmosphere and with normal air conditions. It is concluded that the novel non-intrusive technique provides oxygen concentrations that generally differ by less than one percentage point from the reference sensor values. https://portal.research.lu.se/en/publications/f79fda9c-ebf3-4cbf-92c6-fed45b7ab3b4 https://portal.research.lu.se/files/1348982/2535200.pdf application/pdf 536902 LU/LTH access Elsevier 2012 eng Non-intrusive Laser Spectroscopy Headspace Gas sensing Modified atmosphere Packaging logistics Other Mechanical Engineering Atom and Molecular Physics and Optics http://www.sciencedirect.com/science/article/pii/S0260877412001409 yes 0260-8774 2436999 000304577500010 84860231069 10.1016/j.jfoodeng.2012.03.008 http://dx.doi.org/10.1016/j.jfoodeng.2012.03.008 yes 111 4 612 617 https://www.scopus.com/pages/publications/84860231069 f79fda9c-ebf3-4cbf-92c6-fed45b7ab3b4 2016-04-01T09:52:57+02:00 2026-05-29T11:54:09+02:00 2016-04-01T09:52:57+02:00 3 info:srw/schema/1/mods-v3.3xml journalArticle published yes 9 Fredrik Lindelöw author 0c2e68d5-2854-412b-a0d7-c5d5eb12c147 Magnus Heurlin author fa977bbb-9275-461c-96d7-c8192880c1a0 Gaute Otnes author 4dae2f40-3f87-42a7-99d0-3fdfa00d80d0 Vilgaile Dagyte author 4563a443-8a2d-4134-aa7e-8a70a1c6e102 David Lindgren author 29584c8e-9006-4a2a-bc18-acf7fcb14923 Olof Hultin author b3f58cbc-81c2-4244-a2a8-82046b82e694 Kristian Storm author 39f172de-8a98-4a8d-9c11-9f15d6f721d7 Lars Samuelson author a76146c1-e127-4e10-8c5b-43367155a302 Magnus Borgström author f964e2e8-371c-4083-a42d-47c9ffe04c87 Solid State Physics v1000623 department NanoLund: Centre for Nanoscience v1000190 department In order to push the development of nanowire-based solar cells further using optimized nanowire diameter and pitch, a doping evaluation of the nanowire geometry is necessary. We report on a doping evaluation of n-type InP nanowires with diameters optimized for light absorption, grown by the use of metal-organic vapor phase epitaxy in particle-assisted growth mode using tetraethyltin (TESn) as the dopant precursor. The charge carrier concentration was evaluated using four-probe resistivity measurements and spatially resolved Hall measurements. In order to reach the highest possible nanowire doping level, we set the TESn molar fraction at a high constant value throughout growth and varied the trimethylindium (TMIn) molar fraction for different runs. Analysis shows that the charge carrier concentration in nanowires grown with the highest TMIn molar fraction (not leading to kinking nanowires) results in a low carrier concentration of approximately 10(16) cm(-3). By decreasing the molar fraction of TMIn, effectively increasing the IV/III ratio, the carrier concentration increases up to a level of about 10(19) cm(-3), where it seems to saturate. Axial carrier concentration gradients along the nanowires are found, which can be correlated to a combination of changes in the nanowire growth rate, measured in situ by optical reflectometry, and polytypism of the nanowires observed in transmission electron microscopy. https://portal.research.lu.se/en/publications/7ca3197d-03ae-4df0-a564-a2ebf3103516 IOP Publishing 2016 eng Hall effect nanowires resistivity doping carrier concentration InP Nano-technology Energy Engineering Condensed Matter Physics (including Material Physics, Nano Physics) 0957-4484 8728564 000368897100025 84954570009 26762762 10.1088/0957-4484/27/6/065706 http://dx.doi.org/10.1088/0957-4484/27/6/065706 yes 27 6 065706 https://www.scopus.com/pages/publications/84954570009 7ca3197d-03ae-4df0-a564-a2ebf3103516 2016-04-01T09:54:43+02:00 2025-10-14T11:32:33+02:00 2016-04-01T09:54:43+02:00 4 info:srw/schema/1/mods-v3.3xml journalArticle published yes 2 Per Ståhle author 6d203fae-9c9f-481a-b4eb-c7c039da2c1b Eskil Hansen author ca6f6b04-f461-4141-a734-316f9e7cfd23 Solid Mechanics v1000231 department Mathematics (Faculty of Engineering) v1000667 department Partial Differential Equations project Numerical Analysis and Scientific Computing project The evolution of surfaces exposed to an aggressive environment and mechanical load is studied. This is a process of stress corrosion that leads to pitting, crack initiation and growing cracks. In conventional fracture analyses a known or a postulated crack is required. A serious complication is that a large part of the lifetime of a crack or a surface flaw is spent during the initiation of the crack. The knowledge of the mechanisms leading from a pit, flaw, scratch, etc. to a crack is very limited. The motivation for the present study is to provide a model that will increase the understanding of the transition from stress induced surface roughening and pitting to growing cracks. The evolution of the originally flat surface involves free strain energy, chemical energy and gradient energy. A phase field model is used to capture the driving forces that the free energy causes. The flat surface is unstable and develop a waviness. Initially while the waves are shallow a spectrum of favoured spatial frequencies are found to be in accordance with the Asaro-Tiller-Grinfeld theory. Later the surface curvature becomes larger at the depressions than at the higher parts of the surface. This increases the growth rate of formed pits. The pits finally develop into cracks. Also massive branching of pits and cracks is observed. (C) 2014 Elsevier Ltd. All rights reserved. https://portal.research.lu.se/en/publications/811b5d06-9d5d-4b89-acc4-7ae7bb8f7c23 Elsevier 2015 eng Stress corrosion Crack initiation Surface morphology Phase field model Anti-plane strain Mathematical Sciences Physical Sciences Applied Mechanics 1350-6307 5069986 000347757600002 84911869294 10.1016/j.engfailanal.2014.07.025 http://dx.doi.org/10.1016/j.engfailanal.2014.07.025 yes 47 241 251 10 https://www.scopus.com/pages/publications/84911869294 The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Solid Mechanics (011094009), Numerical Analysis (011015004) 811b5d06-9d5d-4b89-acc4-7ae7bb8f7c23 2016-04-01T09:59:06+02:00 2026-02-12T11:06:20+01:00 2016-04-01T09:59:06+02:00 5 info:srw/schema/1/mods-v3.3xml journalArticle published yes 15 Jenny Rissler author 18e92696-32fc-4edd-80ed-da7f82295054 Erik Nordin author be63c4b0-c560-480e-84b0-c0f43902a5ad Axel Eriksson author e20446b9-4411-46ea-8cc6-ab4545dc11c8 Patrik Nilsson author 3710e59e-d4a4-4ee1-bb26-d762b103cb1d Mia Frosch author 86d4b98a-1abb-45e0-bbe7-022160d49588 Moa Sporre author 02c199e7-fd10-433f-9d28-8a0a79d963f2 Aneta Wierzbicka author 5c0829b5-5e98-439b-9a2b-2439cd3e7a7d Birgitta Svenningsson author 352c4675-a8c7-46b2-8b13-b145c1fba4e5 Jakob Löndahl author d2a273a0-e461-4d73-afca-b2f449e89741 Maria Messing author 58c1f702-a995-45cc-beb6-d4fc9b4b04a7 Staffan Sjögren author b45cd64c-9a03-4944-8e4e-327356046894 Jette G Hemmingsen author Steffen Loft author Joakim Pagels author 7f6ee433-447b-4cd4-aa9b-aa9cac69d168 Erik Swietlicki author 728b37a5-4444-4673-9a7c-26b7c3219bfe Nuclear physics v1000629 department Ergonomics and Aerosol Technology v1000237 department Solid State Physics v1000623 department MERGE: ModElling the Regional and Global Earth system v1000618 department In urban environments, airborne particles are continuously emitted, followed by atmospheric aging. Also, particles emitted elsewhere, transported by winds, contribute to the urban aerosol. We studied the effective density (mass-mobility relationship) and mixing state with respect to the density of particles in central Copenhagen, in wintertime. The results are related to particle origin, morphology, and aging. Using a differential mobility analyzer-aerosol particle mass analyzer (DMA-APM), we determined that particles in the diameter range of 50-400 nm were of two groups: porous soot aggregates and more dense particles. Both groups were present at each size in varying proportions. Two types of temporal variability in the relative number fraction of the two groups were found: soot correlated with intense traffic in a diel pattern and dense particles increased during episodes with long-range transport from polluted continental areas. The effective density of each group was relatively stable over time, especially of the soot aggregates, which had effective densities similar to those observed in laboratory studies of fresh diesel exhaust emissions. When heated to 300 °C, the soot aggregate volatile mass fraction was ∼10%. For the dense particles, the volatile mass fraction varied from ∼80% to nearly 100%. https://portal.research.lu.se/en/publications/9936aeb5-d42a-4b5e-b0b7-8fa22621ec00 https://portal.research.lu.se/files/1475258/5052040.pdf application/pdf 6648863 no The American Chemical Society (ACS) 2014 eng Subatomic Physics Production Engineering, Human Work Science and Ergonomics Condensed Matter Physics (including Material Physics, Nano Physics) 1520-5851 4455765 24798545 000336952000030 84901925165 24798545 10.1021/es5000353 http://dx.doi.org/10.1021/es5000353 48 11 6300 6308 https://www.scopus.com/pages/publications/84901925165 The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Ergonomics and Aerosol Technology (011025002), Nuclear Physics (Faculty of Technology) (011013007), Solid State Physics (011013006) 9936aeb5-d42a-4b5e-b0b7-8fa22621ec00 2016-04-01T10:00:28+02:00 2026-03-11T18:37:14+01:00 2016-04-01T10:00:28+02:00 6 info:srw/schema/1/mods-v3.3xml journalArticle published yes 8 Karl-Johan Nogenmyr author 69960488-bc42-4f7d-a50b-f3eb40957c3e Per Petersson author 1dc220c8-3d93-4e78-aaec-c75ab23ce80b Xue-Song Bai author 3e6a21e3-2b84-4020-aab0-02b01f93c653 C. Fureby author Robert Collin author 18b4d40b-2391-4278-8e7c-2aaf6e997b6a Andreas Lantz author ba1ca458-759d-47cf-b9cc-33ab4a05df2e Mark Linne author 37789239-07ad-440f-91ec-767e4fbc7769 Marcus Aldén author 31a62b03-f895-4a38-815a-bc986ff44328 Fluid Mechanics v1000210 department Combustion Physics v1000625 department eSSENCE: The e-Science Collaboration v1001240 department Lund Laser Centre, LLC v1000184 department This paper presents numerical and experimental investigations of the structure and stabilization of a low swirl turbulent stratified lean premixed methane/air flame. Large-eddy simulations are performed using a two-scalar flamelet model based on mixture fraction for predicting the stratification in the fuel/air mixture and a level-set G-function for tracking the flame. Measurements are carried out with LDV for velocity field and simultaneous PLIF of OH radicals and fuel tracer acetone to identify the structures of the flame. The leading edge flame front is observed to exhibit large-scale flame front wrinkling with a particular W-shaped front frequently occurring. This structure is formed due to the interaction of flame front with the large-scale flow motion in the inner low speed zone and the outer high-speed shear-layer of the burner. The W-structures are formed and destroyed periodically at 15 Hz. The flame stabilization is shown to be dictated by the large-scale vortex rings in the shear-layer. This flame stabilization mechanism is rather different from that found in typical bluff-body stabilized flames and high-swirl flames. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved. https://portal.research.lu.se/en/publications/cc4ce9db-540f-40a1-967d-b8d7b78d7b91 Elsevier 2011 eng Low-swirl flame Lean premixed flame stabilization Flame structures Laser diagnostics Large eddy simulation Atom and Molecular Physics and Optics Fluid Mechanics 1540-7489 1870198 000285780200173 78650894277 10.1016/j.proci.2010.06.011 http://dx.doi.org/10.1016/j.proci.2010.06.011 yes 33 1567 1574 https://www.scopus.com/pages/publications/78650894277 cc4ce9db-540f-40a1-967d-b8d7b78d7b91 2016-04-01T10:03:34+02:00 2026-05-29T11:53:22+02:00 2016-04-01T10:03:34+02:00 7 info:srw/schema/1/mods-v3.3xml journalArticle published yes 8 Rikard Wellander author 922f85d5-5cdf-4e0f-8f53-052582265b74 Joakim Rosell author f3ccfa33-ac89-4d54-b394-0e32aae0694e Mattias Richter author 5f7a5ba9-345d-49a1-a2d3-05d140fe557b Marcus Aldén author 31a62b03-f895-4a38-815a-bc986ff44328 Öivind Andersson author 6c8ba8ef-efd0-4f18-a099-1432b09b4ac3 Bengt Johansson author d6ec4da1-f655-4a7c-aad2-46cd46dadec2 Jeudi Duong author d512f2ad-0b27-4196-9f38-01c24f41f185 Jari Hyvönen author f948825e-6553-403b-bb14-3769fe04ccdb Combustion Physics v1000625 department Sustainable energy systems v1000207 department Lund Laser Centre, LLC v1000184 department In this work the pre- to main chamber ignition process is studied in a Wärtsilä 34SG spark-ignited lean burn four-stroke large bore optical engine (bore 340 mm) operating on natural gas. Unburnt and burnt gas regions in planar cross-sections of the combustion chamber are identified by means of planar laser induced fluorescence (PLIF) from acetone seeded to the fuel. The emerging jets from the pre-chamber, the ignition process and early flame propagation are studied. Measurements reveal the presence of a significant temporal delay between the occurrence of a pressure difference across the pre-chamber holes and the appearance of hot burnt/burning gases at the nozzle exit. Variations in the delay affect the combustion timing and duration. The combustion rate in the pre-chamber does not influence the jet propagation speed, although it still has an effect on the overall combustion duration. PLIF images also show that there is mainly lean unburnt gas, originating from the main-chamber, that exit the pre-chamber in the initial phase of ignition, indicating incomplete mixing of the gases in the pre-chamber prior ignition. These findings are also supported by CFD modeling performed on the Wärtsilä 34SG combustion system. Similar to the air entrainment in a diesel spray, the jets exiting the pre-chamber causes pronounced entrainment of compressed fresh charges into the burning jets, thus promoting heat transfer and subsequent ignition. https://portal.research.lu.se/en/publications/98443a00-a07b-4fb5-88b0-20366bcd71c8 SAE 2014 eng Atom and Molecular Physics and Optics Other Mechanical Engineering 1946-3944 4858040 84903385227 10.4271/2014-01-1330 http://dx.doi.org/10.4271/2014-01-1330 yes 7 2 928 936 https://www.scopus.com/pages/publications/84903385227 98443a00-a07b-4fb5-88b0-20366bcd71c8 2016-04-01T10:04:50+02:00 2026-05-29T11:56:13+02:00 2016-04-01T10:04:50+02:00 8 info:srw/schema/1/mods-v3.3xml journalArticle published yes 16 Eric Baudoin author 74ac5bb0-fd6b-4efb-ab2b-e6f114bbefdc Xue-Song Bai author 3e6a21e3-2b84-4020-aab0-02b01f93c653 Beibei Yan author 3c2ce608-f0fd-4a57-a923-94475ac62129 C. Liu author R. Yu author 34d3ba48-c5e9-42a9-aa54-54c232704540 Andreas Lantz author ba1ca458-759d-47cf-b9cc-33ab4a05df2e Seyed Mohammad Hosseini author 12418793-ed99-4812-af74-7643775c706d B. Li author A. Elbaz author M. Sami author Zhongshan Li author beb91039-a9db-4bf6-a411-5ac48da9a67e Robert Collin author 18b4d40b-2391-4278-8e7c-2aaf6e997b6a G. Chen author Laszlo Fuchs author 62a72c7c-3f3b-44d8-b3fb-678fc33ea125 Marcus Aldén author 31a62b03-f895-4a38-815a-bc986ff44328 M.S. Mansour author eSSENCE: The e-Science Collaboration v1001240 department Fluid Mechanics v1000210 department Combustion Physics v1000625 department Lund Laser Centre, LLC v1000184 department Abstract in Undetermined<br/>The stabilization characteristics and local extinction structures of partially premixed methane/air flames were studied using simultaneous OH-PLIF/PIV techniques, and large eddy simulations employing a two-scalar flamelet model. Partial premixing was made in a mixing chamber comprised of two concentric tubes, where the degree of partial premixing of fuel and air was controlled by varying the mixing length of the chamber. At the exit of the mixing chamber a cone was mounted to stabilize the flames at high turbulence intensities. The stability regime of flames was determined for different degree of partial premixing and Reynolds numbers. It was found that in general partially premixed flames at low Reynolds numbers become more stable when the level of partial premixing of air to the fuel stream decreases. At high Reynolds numbers, for the presently studied burner configuration there is an optimal partial premixing level of air to the fuel stream at which the flame is most stable. OH-PLIF images revealed that for the stable flames not very close to the blowout regime, significant local extinction holes appear already. By increasing premixing air to fuel stream successively, local extinction holes grow in size leading to eventual flame blowout. Local flame extinction was found to frequently attain to locations where locally high velocity flows impinging to the flame. The local flame extinction poses a future challenge for model simulations and the present flames provide a possible test case for such study. https://portal.research.lu.se/en/publications/604bff98-5f9a-4961-9939-3eaaab482252 Springer 2013 eng Partially premixed flames Flame stabilization Local quenching Flame holes Atom and Molecular Physics and Optics Fluid Mechanics 1573-1987 3290426 000315042000004 84878444856 10.1007/s10494-012-9414-z http://dx.doi.org/10.1007/s10494-012-9414-z yes 90 2 269 284 https://www.scopus.com/pages/publications/84878444856 604bff98-5f9a-4961-9939-3eaaab482252 2016-04-01T10:05:00+02:00 2026-05-29T11:55:13+02:00 2016-04-01T10:05:00+02:00 9 info:srw/schema/1/mods-v3.3xml journalArticle published yes 5 Bo Zhou author 6a7641be-2f4f-4d79-951b-7b1875e600f4 Christian Brackmann author ad156c09-6998-44f6-a990-0033c0a5f0e4 Zhongshan Li author beb91039-a9db-4bf6-a411-5ac48da9a67e Marcus Aldén author 31a62b03-f895-4a38-815a-bc986ff44328 Xue-Song Bai author 3e6a21e3-2b84-4020-aab0-02b01f93c653 Combustion Physics v1000625 department Fluid Mechanics v1000210 department Lund Laser Centre, LLC v1000184 department https://portal.research.lu.se/en/publications/f537f00c-ed07-45db-99a9-8ad066f854f9 Elsevier 2015 eng Atom and Molecular Physics and Optics Fluid Mechanics Energy Engineering 1540-7489 4933894 000348048800033 84964200360 10.1016/j.proci.2014.06.107 http://dx.doi.org/10.1016/j.proci.2014.06.107 yes 35 2 1409 1416 8 https://www.scopus.com/pages/publications/84964200360 f537f00c-ed07-45db-99a9-8ad066f854f9 2016-04-01T10:09:30+02:00 2026-05-29T11:57:05+02:00 2016-04-01T10:09:30+02:00 10 info:srw/schema/1/mods-v3.3xml journalArticle published yes 9 Bo Li author 5eec7611-427c-4bf6-b443-5d7cab58a222 Malin Jonsson author 9595ee50-a3e0-4b12-9edc-d5ee042ea001 Martin Algotsson author 59547f3a-80c6-4f4c-8d59-07d27bc9ab32 Joakim Bood author b628624d-9fc0-4363-b36b-a7c8800f5992 Zhongshan Li author beb91039-a9db-4bf6-a411-5ac48da9a67e Olof Johansson author 3bfab6a3-c6c3-4c08-b0b5-69daba4da085 Marcus Aldén author 31a62b03-f895-4a38-815a-bc986ff44328 Martin Tunér author cf1a72d1-293c-4eb9-8a19-8a65f936bffb Bengt Johansson author d6ec4da1-f655-4a7c-aad2-46cd46dadec2 Combustion Physics v1000625 department Sustainable energy systems v1000207 department Lund Laser Centre, LLC v1000184 department A photofragmentation laser-induced fluorescence (PF-LIF) technique was applied to an HCCI engine for hydrogen peroxide (H2O2) measurements. A pump-probe strategy was adopted with the pump laser (266 nm) photolyzing H2O2, and with the probe laser (283 nm) detecting the generated OH photofragments. An on-line calibration process was performed by introducing a known amount of vaporized H2O2/water solution into the engine cylinder. Crank-angle resolved mass fractions of H2O2 were obtained, and for the first time, single-shot imaging of H2O2 was realized in the HCCI engine. It has also been verified that the PF-LIF signal originates mainly from H2O2 with a smaller interference from HO2. The crank-angle resolved experimental data were compared to mass fractions calculated with the software package Digital Analysis of Reaction Systems (DARS). The calculated H2O2 profile agrees well with the experimental results regarding mass fraction level, while the shapes of the profiles deviate slightly. Calculated mass fractions of HO2 indicate that interfering signal contributions from HO2 is the major reason for the deviation. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved. https://portal.research.lu.se/en/publications/ef44e020-f29e-407f-84a1-e342b3820a28 Elsevier 2013 eng Photofragmentation laser induced fluorescence Hydrogen peroxide HCCI engine Mass fraction Two-dimensional imaging Other Mechanical Engineering Atom and Molecular Physics and Optics 1540-7489 3476858 000313131800191 84872019500 10.1016/j.proci.2012.05.080 http://dx.doi.org/10.1016/j.proci.2012.05.080 yes 34 3573 3581 https://www.scopus.com/pages/publications/84872019500 ef44e020-f29e-407f-84a1-e342b3820a28 2016-04-01T10:11:29+02:00 2026-05-29T11:55:08+02:00 2016-04-01T10:11:29+02:00 11 info:srw/schema/1/mods-v3.3xml conference paper published yes 10 Beibei Yan author 3c2ce608-f0fd-4a57-a923-94475ac62129 Bo Li author 5eec7611-427c-4bf6-b443-5d7cab58a222 Eric Baudoin author 74ac5bb0-fd6b-4efb-ab2b-e6f114bbefdc Changye Liu author ce74b5ff-76ad-4b6f-a9f0-54acbb7c576a Zhiwei Sun author 4fb882e8-837b-4a1b-9755-6d0d414db265 Zhongshan Li author beb91039-a9db-4bf6-a411-5ac48da9a67e Xue-Song Bai author 3e6a21e3-2b84-4020-aab0-02b01f93c653 Marcus Aldén author 31a62b03-f895-4a38-815a-bc986ff44328 G. Chen author M. S. Mansour author Fluid Mechanics v1000210 department Combustion Physics v1000625 department eSSENCE: The e-Science Collaboration v1001240 department Lund Laser Centre, LLC v1000184 department 6th Miditerranean Combustion Symposium Experiments are carried out on partially premixed turbulent flames stabilized in a conical burner. The investigated gaseous fuels are methane, methane diluted with nitrogen, and Mixtures of CH4, CO, CO2, H-2 and N-2, Simulating typical products from gasification of biomass, and co-firing of gasification gas with methane. The fuel and air are partially premixed in concentric tubes. Flame stabilization behavior is investigated and significantly different stabilization characteristics are observed in flames with and without the cone. Planar laser induced fluorescence (LIF) imaging of a fuel-tracer species, acetone, and OH radicals is carried out to characterize the flame structures. Large eddy simulations of the conical flames are carried out to gain further understanding of the flame/flow interaction in the cone. The data show that the flames with the cone are more stable than those without the cone. Without the cone (i.e. jet burner) the critical jet velocities for blowoff and liftoff of biomass derived gases are higher than that for methane/nitrogen mixture with the same heating values, indicating the enhanced flame stabilization by hydrogen in the mixture. With the cone the stability of flames is not sensitive to the compositions of the fuels, owing to the different flame stabilization mechanism in the conical flames than that in the jet flames. From the PLIF images it is shown that in the conical burner, the flame is stabilized by the cone at nearly the same position for different fuels. From large eddy simulations, the flames are shown to be controlled by the recirculation flows inside cone, which depends on the cone angle, but less sensitive to the fuel compositions and flow speed. The flames tend to be hold in the recirculation zones even at very high flow speed. Flame blowoff occurs when significant local extinction in the main body of the flame appears at high turbulence intensities. (C) 2009 Elsevier Inc. All rights reserved. https://portal.research.lu.se/en/publications/6127c34f-4dcd-4066-9a01-84848f4c20c6 Elsevier 2010 2009-06-07 - 2009-06-11 Corsica, France eng Local flame extinction Flame stability Conical burner Low calorific gas flames Partially premixed flames Fluid Mechanics Atom and Molecular Physics and Optics 0894-1777 1879-2286 1588416 000275363600023 75449098663 10.1016/j.expthermflusci.2009.10.011 http://dx.doi.org/10.1016/j.expthermflusci.2009.10.011 yes 34 3 412 419 https://www.scopus.com/pages/publications/75449098663 6127c34f-4dcd-4066-9a01-84848f4c20c6 2016-04-01T10:19:31+02:00 2026-06-03T11:44:03+02:00 2016-04-01T10:19:31+02:00 12 info:srw/schema/1/mods-v3.3xml journalArticle published yes 5 Adam Kristensson author 6cda9f30-ff27-4860-bd68-0e234d291ba5 Jenny Rissler author 18e92696-32fc-4edd-80ed-da7f82295054 Jakob Löndahl author d2a273a0-e461-4d73-afca-b2f449e89741 Christer Johansson author Erik Swietlicki author 728b37a5-4444-4673-9a7c-26b7c3219bfe Nuclear physics v1000629 department Ergonomics and Aerosol Technology v1000237 department NanoLund: Centre for Nanoscience v1000190 department MERGE: ModElling the Regional and Global Earth system v1000618 department Particle size distributions and hygroscopic growth were studied in a town in Sweden with extensive emissions from wood combustion. The average deposited fraction of particle number, surface area and volume dose in the human respiratory tract was estimated using the data set, as well as the typical deposition pattern of the two dominant particle source types: wood combustion and traffic exhaust. As far as we know, this is the first report on the deposited fraction and hygroscopicity of ambient particles from domestic wood combustion in the literature. The use of PM2.5 as a substitute for the deposited dose was also tested. Source/receptor modeling and the hygroscopicity measurements showed that wood combustion and traffic exhaust are dominant sources, and that these particles have a low water uptake. Number fractions of 38 and 69% of the wood combustion and traffic particles, respectively, were deposited in the respiratory tract, and 53% of the particles were deposited as an average for the whole period. The deposited fraction of the surface area and volume dose was also calculated for wood combustion particles, with the result being 22% for both parameters. The results also revealed that the PM2.5 average over more than 10 hours correlated well (r(2) &gt; 0.80) with the deposited surface area and volume dose. This means that PM2.5 can be used as proxy for the deposited dose when examining health effect relationships during short-term exposure studies if the averaging time is sufficient, while a PM2.5 proxy is not recommended for shorter averaging times. https://portal.research.lu.se/en/publications/0315da5c-e6c9-4abc-9e12-979a2d1f88a4 Taiwan Association for Aerosol Research 2013 eng H-TDMA ICRP MPPD DMPS Residential wood combustion Lung deposition Production Engineering, Human Work Science and Ergonomics Subatomic Physics 2071-1409 3935670 000318974500004 84873021537 10.4209/aaqr.2012.07.0194 http://dx.doi.org/10.4209/aaqr.2012.07.0194 yes 13 1 24 35 https://www.scopus.com/pages/publications/84873021537 The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007), Ergonomics and Aerosol Technology (011025002) 0315da5c-e6c9-4abc-9e12-979a2d1f88a4 2016-04-01T10:22:21+02:00 2026-01-14T20:01:55+01:00 2016-04-01T10:22:21+02:00 13 info:srw/schema/1/mods-v3.3xml journalArticle published yes 5 Märta Lewander author 909f784d-3969-4f58-962f-ecb071498c60 Patrik Lundin author c0aa7064-1c09-4e72-bf2a-5878c57237b5 Tomas Svensson author 58447cab-e9b6-4a24-8718-3c74133b3664 Sune Svanberg author 6c4fbfa4-9292-434b-b63d-9dcd5771412a Annika Olsson author c98a031c-5cca-40c6-8133-9e410a9bb9d4 Atomic Physics v1000622 department Packaging Logistics v1000238 department Lund Laser Centre, LLC v1000184 department The increase in chilled food consumption requires enhanced food safety and quality assurance. Food deteriorating processes are affected by the presence of oxygen, combined with factors such as time and temperature. To slow down deterioration processes and prolong shelf life, traditional packaging methods are being replaced by Modified Atmosphere Packaging (MAP), for example. Oxygen, which is naturally present in the headspace of most food packages, is then reduced and controlled.<br/><br> Many sensing techniques for food quality assurance have been developed; however, almost all are intrusive, increasing the complication level and causing sample waste. The purpose of this article is to introduce a non-intrusive technique (GASMAS) for measuring gas composition in the headspace of liquid food packages. The GASMAS method uses diode laser absorption spectroscopy combined with diffuse light propagation to analyze gas located inside solids and liquids. By illuminating the package from the outside and analyzing the scattered light that emerges, the absorption from the gas inside the headspace can be studied. <br/><br> The GASMAS technique was evaluated on a series of carton packages with high quality orange juice and a nitrogen headspace. A clear variation in oxygen content was measured for samples with different storage times. The results demonstrate the possibility of using the GASMAS method for non-intrusive quality measurements in food products and packaging. They also indicate the potential for non-intrusive quality assurance applications without waste of samples. A further development of the technique could include “in-line” quality control of packed food items throughout the food packaging supply chain. https://portal.research.lu.se/en/publications/ca6bfde7-d1eb-4a1f-8f19-f2fed15be5da https://portal.research.lu.se/files/1789566/2607774.pdf application/pdf 251219 LU/LTH access John Wiley & Sons Inc. 2011 eng Liquid food quality Packaging quality Non-intrusive measurements Headspace gas composition Modified atmosphere food packaging logistics Packaging logistics Atom and Molecular Physics and Optics Other Mechanical Engineering http://onlinelibrary.wiley.com/doi/10.1002/pts.934/pdf yes 0894-3214 1757080 000294223800002 80051543922 10.1002/pts.934 http://dx.doi.org/10.1002/pts.934 yes 24 5 271 280 https://www.scopus.com/pages/publications/80051543922 ca6bfde7-d1eb-4a1f-8f19-f2fed15be5da 2016-04-01T10:22:31+02:00 2026-05-29T11:53:20+02:00 2016-04-01T10:22:31+02:00 14 info:srw/schema/1/mods-v3.3xml journalArticle published yes 10 Cerina Wittbom author 80246e58-8934-424f-a0c7-fa288b4be3cf Axel Eriksson author e20446b9-4411-46ea-8cc6-ab4545dc11c8 Jenny Rissler author 18e92696-32fc-4edd-80ed-da7f82295054 Jonatan Carlsson author a4f1c8cf-b347-46fe-831d-067e2ba49fad P. Roldin author 8ae68db4-3b2b-440f-b594-9f36c5e93573 Erik Nordin author be63c4b0-c560-480e-84b0-c0f43902a5ad Patrik Nilsson author 3710e59e-d4a4-4ee1-bb26-d762b103cb1d Erik Swietlicki author 728b37a5-4444-4673-9a7c-26b7c3219bfe Joakim Pagels author 7f6ee433-447b-4cd4-aa9b-aa9cac69d168 Birgitta Svenningsson author 352c4675-a8c7-46b2-8b13-b145c1fba4e5 Nuclear physics v1000629 department Ergonomics and Aerosol Technology v1000237 department MERGE: ModElling the Regional and Global Earth system v1000618 department Particles containing soot, or black carbon, are generally considered to contribute to global warming. However, large uncertainties remain in the net climate forcing resulting from anthropogenic emissions of black carbon (BC), to a large extent due to the fact that BC is co-emitted with gases and primary particles, both organic and inorganic, and subject to atmospheric ageing processes. In this study, diesel exhaust particles and particles from a flame soot generator spiked with light aromatic secondary organic aerosol (SOA) precursors were processed by UV radiation in a 6m3 Teflon chamber in the presence of NOx. The time-dependent changes of the soot nanoparticle properties were characterised using a Cloud Condensation Nuclei Counter, an Aerosol Particle Mass Analyzer and a Soot Particle Aerosol Mass Spectrometer. The results show that freshly emitted soot particles do not activate into cloud droplets at supersaturations &lt;= 2 %, i. e. the BC core coated with primary organic aerosol (POA) from the exhaust is limited in hygroscopicity. Before the onset of UV radiation it is unlikely that any substantial SOA formation is taking place. An immediate change in cloud-activation properties occurs at the onset of UV exposure. This change in hygroscopicity is likely attributed to SOA formed from intermediate volatility organic compounds (IVOCs) in the diesel engine exhaust. The change of cloud condensation nuclei (CCN) properties at the onset of UV radiation implies that the lifetime of soot particles in the atmosphere is affected by the access to sunlight, which differs between latitudes. The ageing of soot particles progressively enhances their ability to act as cloud condensation nuclei, due to changes in: (I) organic fraction of the particle, (II) chemical properties of this fraction (e. g. primary or secondary organic aerosol), (III) particle size, and (IV) particle morphology. Applying kappa-K hler theory, using a kappa SOA value of 0.13 (derived from independent input parameters describing the organic material), showed good agreement with cloud droplet activation measurements for particles with a SOA mass fraction &gt;= 0.12 (slightly aged particles). The activation properties are enhanced with only a slight increase in organic material coating the soot particles (SOA mass fraction &lt; 0.12), however not as much as predicted by K hler theory. The discrepancy between theory and experiments during the early stages of ageing might be due to solubility limitations, unevenly distributed organic material or hindering particle morphology. The change in properties of soot nanoparticles upon photochemical processing clearly increases their hygroscopicity, which affects their behaviour both in the atmosphere and in the human respiratory system. https://portal.research.lu.se/en/publications/635ed97c-2d46-4729-bcef-26d021255235 https://portal.research.lu.se/files/1903444/5323066.pdf application/pdf 1053099 no Copernicus GmbH 2014 eng Subatomic Physics Production Engineering, Human Work Science and Ergonomics 1680-7324 4709750 000341993100022 84901948343 10.5194/acp-14-9831-2014 http://dx.doi.org/10.5194/acp-14-9831-2014 14 18 9831 9854 https://www.scopus.com/pages/publications/84901948343 The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Ergonomics and Aerosol Technology (011025002), Nuclear Physics (Faculty of Technology) (011013007) 635ed97c-2d46-4729-bcef-26d021255235 2016-04-01T10:30:23+02:00 2026-01-14T23:20:48+01:00 2016-04-01T10:30:23+02:00 15 info:srw/schema/1/mods-v3.3xml journalArticle published yes 6 Maria Messing author 58c1f702-a995-45cc-beb6-d4fc9b4b04a7 Christian Svensson author 70c112fa-6459-47c3-8a90-7218fcbbab87 Joakim Pagels author 7f6ee433-447b-4cd4-aa9b-aa9cac69d168 Bengt Meuller author 630a81d5-1f04-45cd-9752-9056424525da Knut Deppert author 3f4dbf76-594b-4cfa-baf9-cd0eafdc12e4 Jenny Rissler author 18e92696-32fc-4edd-80ed-da7f82295054 Solid State Physics v1000623 department Ergonomics and Aerosol Technology v1000237 department NanoLund: Centre for Nanoscience v1000190 department MERGE: ModElling the Regional and Global Earth system v1000618 department Abstract For nanotoxicology investigations of air-borne particles to provide relevant results it is ever so important that the particle exposure of, for example cells, closely resembles the "real" exposure situation, that the dosimetry is well defined, and that the characteristics of the deposited nanoparticles are known in detail. By synthesizing the particles in the gas-phase and directly depositing them on lung cells the particle deposition conditions in the lung is closely mimicked. In this work we present a setup for generation of gas-borne nanoparticles of a variety of different materials with highly controlled and tunable particle characteristics, and demonstrate the method by generation of gold particles. Particle size, number concentration and mass of individual particles of the population are measured on-line by means of differential mobility analyzers (DMA) and an aerosol particle mass analyzer (APM) whereas primary particle size and internal structure are investigated by transmission electron microscopy. A method for 3 estimating the surface area dose from the DMA-APM measurements is applied and we further demonstrate that for the setup used, a deposition time of around 1 hour is needed for deposition onto cells in an air liquid interface chamber, using electrostatic deposition, to reach a toxicological relevant surface area dose. https://portal.research.lu.se/en/publications/35b57e2e-de39-495b-bf1e-92423e13d2f7 Informa Healthcare 2013 eng Condensed Matter Physics (including Material Physics, Nano Physics) Production Engineering, Human Work Science and Ergonomics 1743-5404 2608480 000322836800001 22630037 84881266765 22630037 10.3109/17435390.2012.697589 http://dx.doi.org/10.3109/17435390.2012.697589 yes 7 6 1052 1063 https://www.scopus.com/pages/publications/84881266765 35b57e2e-de39-495b-bf1e-92423e13d2f7 2016-04-01T10:31:26+02:00 2026-01-14T23:45:30+01:00 2016-04-01T10:31:26+02:00 16 info:srw/schema/1/mods-v3.3xml journalArticle published yes 16 Erik Nordin author be63c4b0-c560-480e-84b0-c0f43902a5ad Axel Eriksson author e20446b9-4411-46ea-8cc6-ab4545dc11c8 Pontus Roldin author 8ae68db4-3b2b-440f-b594-9f36c5e93573 Patrik Nilsson author 3710e59e-d4a4-4ee1-bb26-d762b103cb1d Jonatan Carlsson author a4f1c8cf-b347-46fe-831d-067e2ba49fad Maija Kajos author Heidi Hellén author Cerina Wittbom author 80246e58-8934-424f-a0c7-fa288b4be3cf Jenny Rissler author 18e92696-32fc-4edd-80ed-da7f82295054 Jakob Löndahl author d2a273a0-e461-4d73-afca-b2f449e89741 Erik Swietlicki author 728b37a5-4444-4673-9a7c-26b7c3219bfe Birgitta Svenningsson author 352c4675-a8c7-46b2-8b13-b145c1fba4e5 Mats Bohgard author 5a3baf81-b2c1-4605-8cd7-3c78c16a67dc Markku Kulmala author Mattias Hallquist author Joakim Pagels author 7f6ee433-447b-4cd4-aa9b-aa9cac69d168 EpiHealth: Epidemiology for Health v1001239 department NanoLund: Centre for Nanoscience v1000190 department Ergonomics and Aerosol Technology v1000237 department https://portal.research.lu.se/en/publications/c56f61bf-ed65-4bfd-8238-c7a608221fa1 https://portal.research.lu.se/files/1957825/5052038.pdf application/pdf 1017347 no Copernicus GmbH 2013 eng Subatomic Physics Production Engineering, Human Work Science and Ergonomics 1680-7324 3351182 000321766300017 84879924477 10.5194/acp-13-6101-2013 http://dx.doi.org/10.5194/acp-13-6101-2013 13 12 6101 6116 16 https://www.scopus.com/pages/publications/84879924477 Available Open access at : http://www.atmos-chem-phys.net/13/6101/2013/acp-13-6101-2013.pdf c56f61bf-ed65-4bfd-8238-c7a608221fa1 2016-04-01T10:34:31+02:00 2025-10-14T10:12:27+02:00 2016-04-01T10:34:31+02:00 17 info:srw/schema/1/mods-v3.3xml journalArticle published yes 8 Emilie Öström author 451b2e99-c09f-409a-9f65-12671ce8b9b9 Pontus Roldin author 8ae68db4-3b2b-440f-b594-9f36c5e93573 A. Rusanen author D. Mogensen author Niku Kivekäs author 22b8dd1b-956a-4fd0-8c7d-dfa8f5ea8ad3 R. Väänänen author M. Boy author Erik Swietlicki author 728b37a5-4444-4673-9a7c-26b7c3219bfe Ergonomics and Aerosol Technology v1000237 department Nuclear physics v1000629 department MERGE: ModElling the Regional and Global Earth system v1000618 department Biogenic volatile organic compounds (BVOCs) emitted by vegetation play an important role for aerosol mass loadings since the oxidation products of these compounds can take part in the formation and growth of secondary organic aerosols (SOA). The concentrations and properties of BVOCs and their oxidation products in the atmosphere are poorly characterized, which leads to high uncertainties in modeled SOA mass and properties. In this study, the formation of SOA has been modeled along an air-mass trajectory over northern European boreal forest using two aerosol dynamics box models where the prediction of the condensable organics from the gas-phase oxidation of BVOC is handled with schemes of varying complexity. The use of box model simulations along an air-mass trajectory allows us to compare, under atmospheric relevant conditions, different model parameterizations and their effect on SOA formation. The result of the study shows that the modeled mass concentration of SOA is highly dependent on the organic oxidation scheme used to predict oxidation products. A near-explicit treatment of organic gas-phase oxidation (Master Chemical Mechanism version 3.2) was compared to oxidation schemes that use the volatility basis set (VBS) approach. The resulting SOA mass modeled with different VBS schemes varies by a factor of about 7 depending on how the first-generation oxidation products are parameterized and how they subsequently age (e.g., how fast the gas-phase oxidation products react with the OH radical, how they respond to temperature changes, and if they are allowed to fragment during the aging process). Since the VBS approach is frequently used in regional and global climate models due to its relatively simple treatment of the oxidation products compared to near-explicit oxidation schemes, a better understanding of the above-mentioned processes is needed. Based on the results of this study, fragmentation should be included in order to obtain a realistic SOA formation. Furthermore, compared to the most commonly used VBS schemes, the near-explicit method produces less-but more oxidized-SOA. https://portal.research.lu.se/en/publications/427d76df-c140-4362-a98f-3cf16a4f7173 Copernicus GmbH 2014 eng Subatomic Physics Production Engineering, Human Work Science and Ergonomics Earth and Related Environmental Sciences 1680-7324 4857281 000344985700018 84909592065 10.5194/acp-14-11853-2014 http://dx.doi.org/10.5194/acp-14-11853-2014 14 21 11853 11869 https://www.scopus.com/pages/publications/84909592065 The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007), Centre for Environmental and Climate Research (CEC) (011085000), Ergonomics and Aerosol Technology (011025002) 427d76df-c140-4362-a98f-3cf16a4f7173 2016-04-01T10:41:06+02:00 2026-01-14T02:47:38+01:00 2016-04-01T10:41:06+02:00 18 info:srw/schema/1/mods-v3.3xml journalArticle published yes 6 Jakob Löndahl author d2a273a0-e461-4d73-afca-b2f449e89741 Winfried Möller author Joakim Pagels author 7f6ee433-447b-4cd4-aa9b-aa9cac69d168 Wolfgang G Kreyling author Erik Swietlicki author 728b37a5-4444-4673-9a7c-26b7c3219bfe Otmar Schmid author Nuclear physics v1000629 department Ergonomics and Aerosol Technology v1000237 department NanoLund: Centre for Nanoscience v1000190 department MERGE: ModElling the Regional and Global Earth system v1000618 department Abstract Determination of the respiratory tract deposition of airborne particles is critical for risk assessment of air pollution, inhaled drug delivery, and understanding of respiratory disease. With the advent of nanotechnology, there has been an increasing interest in the measurement of pulmonary deposition of nanoparticles because of their unique properties in inhalation toxicology and medicine. Over the last century, around 50 studies have presented experimental data on lung deposition of nanoparticles (typical diameter≤100 nm, but here≤300 nm). These data show a considerable variability, partly due to differences in the applied methodologies. In this study, we review the experimental techniques for measuring respiratory tract deposition of nano-sized particles, analyze critical experimental design aspects causing measurement uncertainties, and suggest methodologies for future studies. It is shown that, although particle detection techniques have developed with time, the overall methodology in respiratory tract deposition experiments has not seen similar progress. Available experience from previous research has often not been incorporated, and some methodological design aspects that were overlooked in 30-70% of all studies may have biased the experimental data. This has contributed to a significant uncertainty on the absolute value of the lung deposition fraction of nanoparticles. We estimate the impact of the design aspects on obtained data, discuss solutions to minimize errors, and highlight gaps in the available experimental set of data. https://portal.research.lu.se/en/publications/0faba5ba-7ae3-466b-8da0-feb9c5b22c8d https://portal.research.lu.se/files/2119137/4457812.pdf application/pdf 510531 LU/LTH access Mary Ann Liebert, Inc. 2014 eng aerosol engineered nanoparticles dosimetry health inhalation NSAM ultrafine particles pulmonary lung deposition Subatomic Physics Production Engineering, Human Work Science and Ergonomics 1941-2703 4143063 24151837 000340520400082 84905443848 10.1089/jamp.2013.1044 http://dx.doi.org/10.1089/jamp.2013.1044 yes 27 4 229 254 https://www.scopus.com/pages/publications/84905443848 The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007), Ergonomics and Aerosol Technology (011025002) 0faba5ba-7ae3-466b-8da0-feb9c5b22c8d 2016-04-01T10:46:20+02:00 2026-03-12T13:56:54+01:00 2016-04-01T10:46:20+02:00 19 info:srw/schema/1/mods-v3.3xml conference paper published yes 4 Nina Reistad author be1fcef5-305d-4468-bba6-c0fcda2c9caa Mallory Mayjonade author Aylin Ahadi author d38bfadd-3ef3-4031-9183-b9615b0f1534 Stefan Andersson-Engels author 2c00e38d-5b81-4925-be2b-a4773725d864 Atomic Physics v1000622 department Mechanics v1000252 department Joint Meeting of the 1st SPIE Conference on Biophotonics South America (BSA) / 15th World Congress of the International-Photodynamic-Association (IPA) Diffuse reflectance spectroscopy (DRS) is a rapid, non-invasive optical method widely adopted to gain diagnostic information of tissue. The most flexible approach to this method is a fiber-optic contact-probe used with a spectroscopy system. A challenge of this method is that the external pressure brought by the probe can significantly affect the tissue optical properties as well as the light coupling into the probe, and thus influence the collected DRS-spectrum. In this study we investigate and characterize the effect of probe pressure on DRS-spectra obtained with a calibrated loaded-spring system used with a fiber optic probe in the range (400 – 1600) nm. A multilayer FE-model of the indentation is developed to get a better insight of the distribution of pressure and stresses inside the skin under indentation. https://portal.research.lu.se/en/publications/7ff17e50-09d3-4519-a837-7a38342ca2b1 SPIE 2015 2015-05-23 - 2015-05-25 Rio de Janeiro, Brazil eng Diffuse reflectance spectroscopy probe contact pressure finite element simulation biomechanical tissue optical properties. Atom and Molecular Physics and Optics Applied Mechanics 0277-786X 1996-756X 5336565 000359467600066 84938948510 10.1117/12.2180917 http://dx.doi.org/10.1117/12.2180917 yes 9531 953143 953143 8 https://www.scopus.com/pages/publications/84938948510 7ff17e50-09d3-4519-a837-7a38342ca2b1 2016-04-01T10:48:17+02:00 2026-01-14T05:50:29+01:00 2016-04-01T10:48:17+02:00 20 1.1subject all "1* 203*"subjectall1* 203*