Search Results - "Siivola, E."

Particle Size Magnifier for Nano-CN Detection by Vanhanen, J., Mikkilä, J., Lehtipalo, K., Sipilä, M., Manninen, H. E., Siivola, E., Petäjä, T., Kulmala, M.

“…A new particle size magnifier (PSM) for detection of nano-CN as small as ∼1 nm in mobility diameter was developed, calibrated and tested in atmospheric…”
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Thin-film thermoelectric devices with high room-temperature figures of merit by Venkatasubramanian, Rama, Siivola, Edward, Colpitts, Thomas, O'Quinn, Brooks

“…Thermoelectric materials are of interest for applications as heat pumps and power generators. The performance of thermoelectric devices is quantified by a…”
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New foliage growth is a significant, unaccounted source for volatiles in boreal evergreen forests by Aalto, J, Kolari, P, Hari, P, Kerminen, V.-M, Schiestl-Aalto, P, Aaltonen, H, Levula, J, Siivola, E, Kulmala, M, Bäck, J

“…Estimates of volatile organic compound (VOC) emissions from forests are based on the assumption that foliage has a steady emission potential over its lifetime,…”
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Spatiotemporal analysis of lake chlorophyll-a with combined in situ and satellite data by Kallio, K., Malve, O., Siivola, E., Kervinen, M., Koponen, S., Lepistö, A., Lindfors, A., Laine, M.

“…We estimated chlorophyll- a (Chl-a) concentration using various combinations of routine sampling, automatic station measurements, and MERIS satellite images…”
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Characterization of a Herrmann-type high-resolution differential mobility analyzer by Kangasluoma, J., Attoui, M., Korhonen, F., Ahonen, L., Siivola, E., Petäjä, T.

“…Aerosol instrument characterization and verification for nanometer-sized particles requires well-established generation and classification instruments. A…”
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On the diurnal cycle of urban aerosols, black carbon and the occurrence of new particle formation events in springtime São Paulo, Brazil by Backman, J, Rizzo, LV, Hakala, J, Nieminen, T, Manninen, HE, Morais, F, Aalto, P P, Siivola, E, Carbone, S, Hillamo, R

“…Large conurbations are a significant source of the anthropogenic pollution and demographic differences between cities that result in a different pollution…”
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Annual particle flux observations over a heterogeneous urban area by Järvi, L., Rannik, Ü., Mammarella, I., Sogachev, A., Aalto, P. P., Keronen, P., Siivola, E., Kulmala, M., Vesala, T.

“…Long-term eddy covariance particle number flux measurements for the diameter range 6 nm to 5 μm were performed at the SMEAR III station over an urban area in…”
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Basic characteristics of atmospheric particles, trace gases and meteorology in a relatively clean Southern African Savannah environment by Laakso, L., Laakso, H., Aalto, P. P., Keronen, P., Petäjä, T., Nieminen, T., Pohja, T., Siivola, E., Kulmala, M., Kgabi, N., Molefe, M., Mabaso, D., Phalatse, D., Pienaar, K., Kerminen, V.-M.

“…We have analyzed one year (July 2006–July 2007) of measurement data from a relatively clean background site located in dry savannah in South Africa. The…”
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Transportable Aerosol Characterization Trailer with Trace Gas Chemistry: Design, Instruments and Verification by Petäjä, T., Vakkari, V., Pohja, T., Nieminen, T., Laakso, H., Aalto, P.P., Keronen, P., Siivola, E., Kerminen, V.-M., Kulmala, M., Laakso, L.

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Tree stem diameter variations and transpiration in Scots pine: an analysis using a dynamic sap flow model by Perämäki, M, Nikinmaa, E, Sevanto, S, Ilvesniemi, H, Siivola, E, Hari, P, Vesala, T

“…A dynamic model for simulating water flow in a Scots pine (Pinus sylvestris L.) tree was developed. The model is based on the cohesion theory and the…”
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Field measurements of ultrasonic acoustic emissions and stem diameter variations. New insight into the relationship between xylem tensions and embolism by Hölttä, T, Vesala, T, Nikinmaa, E, Perämäki, M, Siivola, E, Mencuccini, M

“…We examined interrelated xylem water tensions and embolism dynamics under field conditions by simultaneously monitoring ultra-acoustic emissions and changes in…”
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Effect of variations of PAR on CO2 exchange estimation for Scots pine by Vesala, T, Markkanen, T, Palva, L, Siivola, E, Palmroth, S, Hari, P

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Data fusion system for monitoring water quality: Application to chlorophyll-a in Baltic sea coast by Gunia, M., Laine, M., Malve, O., Kallio, K., Kervinen, M., Anttila, S., Kotamäki, N., Siivola, E., Kettunen, J., Kauranne, T.

“…We present an operational system for multi-sensor data fusion implemented at the Finnish Environment Institute. The system uses Ensemble Kalman filter and…”
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Tree scale distributed multipoint measuring system of photosynthetically active radiation by Palva, L, Markkanen, T, Siivola, E, Garam, E, Linnavuo, M, Nevas, S, Manoochehri, F, Palmroth, S, Rajala, K, Ruotoistenmäki, H, Vuorivirta, T, Seppälä, I, Vesala, T, Hari, P, Sepponen, R

“…A tree scale distributed multipoint measuring system of photosynthetically active radiation (PAR) has been designed. The system is divided into a central unit,…”
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Large external ΔT and cooling power densities in thin-film Bi2Te3-superlattice thermoelectric cooling devices by Bulman, G. E., Siivola, E., Shen, B., Venkatasubramanian, R.

“…Experimental I-V-Tc-ΔT data of thin-film superlattice thermoelectric modules is used to determine the internal ΔT, cross-plane Seebeck coefficient, effective…”
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Wintertime subarctic new particle formation from Kola Peninsula sulfur emissions by Sipilä, Mikko, Sarnela, Nina, Neitola, Kimmo, Laitinen, Totti, Kemppainen, Deniz, Beck, Lisa, Duplissy, Ella-Maria, Kuittinen, Salla, Lehmusjärvi, Tuuli, Lampilahti, Janne, Kerminen, Veli-Matti, Lehtipalo, Katrianne, Aalto, Pasi P, Keronen, Petri, Siivola, Erkki, Rantala, Pekka A, Worsnop, Douglas R, Kulmala, Markku, Jokinen, Tuija, Petäjä, Tuukka

“…The metallurgical industry in the Kola Peninsula, north-west Russia, form, after Norilsk, Siberia, the second largest source of air pollution in the Arctic and…”
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Anthropogenic and biogenic influence on VOC fluxes at an urban background site in Helsinki, Finland by Rantala, Pekka, Järvi, Leena, Taipale, Risto, Laurila, Terhi K, Patokoski, Johanna, Kajos, Maija K, Kurppa, Mona, Haapanala, Sami, Siivola, Erkki, Petäjä, Tuukka, Ruuskanen, Taina M, Rinne, Janne

“…We measured volatile organic compounds (VOCs), carbon dioxide (CO2) and carbon monoxide (CO) at an urban background site near the city centre of Helsinki,…”
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Quantifying spatial variability of photosynthetically active radiation within canopies using a multipoint measuring system by Palva, L, Garam, E, Siivola, E, Sepponen, R, Hari, P

“…A multipoint measuring system of photosynthetically active radiation (PAR) was used to investigate the effect of the number and position of measuring points in…”
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In-plane thermoelectric properties of freestanding Si/Ge superlattice structures by Venkatasubramanian, R., Siivola, E., Colpitts, T.S.

“…Freestanding, thin-film Si/Ge superlattice (SL) structures over a wide range of periods, from /spl sim/300 /spl Aring/ to /spl sim/10 /spl Aring/, have been…”
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Vertical profiles of sub-3 nm particles over the boreal forest by Leino, Katri, Lampilahti, Janne, Poutanen, Pyry, Väänänen, Riikka, Manninen, Antti, Buenrostro Mazon, Stephany, Dada, Lubna, Franck, Anna, Wimmer, Daniela, Aalto, Pasi P., Ahonen, Lauri R., Enroth, Joonas, Kangasluoma, Juha, Keronen, Petri, Korhonen, Frans, Laakso, Heikki, Matilainen, Teemu, Siivola, Erkki, Manninen, Hanna E., Lehtipalo, Katrianne, Kerminen, Veli-Matti, Petäjä, Tuukka, Kulmala, Markku

“…This work presents airborne observations of sub-3 nm particles in the lower troposphere and investigates new particle formation (NPF) within an evolving…”
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