127,847 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Q&As Data
No full textThis is the data set which was used for performing analyses in the article entitled 'Concept Based Auto-Assignment of Healthcare Questions to Domain Experts in Online Q&A Communities' submitted to the International Journal of Medical Informatics
Data of subjects living with disabilities in the city of Ahvaz, Iran
No full textThe dataset divided into two data files and one help file: (a) Spatial data of people living with disability (point feature format file), (b) Spatial data of people living with disability aggregated into the Ahvaz city neighborhoods (polygon feature format file) and (c) Help file. Two data files are presented in shapefile format (*.shp) and for all these layers, a suitable Geographic Coordinate System (GCS) has been defined for using in Geographical Information Systems (GISs). The jittering method has been applied to preserve the confidentiality of disabled subjects. The help file is prepared in Excel file format (*.xlsx) for both data files in a single sheet. (2021-03-09)
Passiivisten bioreaktoreiden kehittäminen erityyppisten vähähiilisten jätevesien käsittelyyn kylmissä ilmasto-olosuhteissa
No full textAbstractWoodchip bioreactors have been used as an engineered solutions for mitigating nitrate from contaminated water. However, their year-round treatment performance and possible solutions for enhancing their removal efficiency under cold climate conditions still needs more research. In this thesis, we investigated nitrogen removal from aquaculture and mine-influenced water as an indoor and outdoor treatment system under several experimental conditions. This thesis attempts to identify design parameters (e.g., optimal hydraulic retention time (HRT) and nitrate removal rate) and enhancement solutions for woodchip bioreactors under cold climate conditions such as additional carbon source, hydraulic design and use of a floating aquatic as a hybrid system. The results show that woodchip bioreactors can successfully remove nitrate from recirculating aquaculture system (RAS) discharge and mine-influenced water under cold climate conditions. Two-year results from a full-scale woodchip bioreactor showed that selected design parameters from a laboratory-scale were sufficient to complete denitrification at the full-scale. The denitrification followed first-order reaction for RAS effluent and optimal HRT ranged between 1.5 to 2 d to achieve a nitrate removal rate of 25.8 g NO-3-N m-3d-1 and 74% removal efficiency. A layer of 50 cm of dry woodchips combined with snow cover (20‐30 cm) was sufficient to prevent frost, the water temperature never dropped lower than 7.3 °C during cold winter conditions (minimum air temperature = -24.7 ℃). Design of the hybrid unit was improved by inserting two inner plates along the water flow and adding floating hook-moss improved the hydraulic efficiency from poor (λ=0.06) to satisfactory (λ=0.51) which led to higher removal rates.Original papersOriginal papers are not included in the electronic version of the dissertation.Kiani, S., Kujala, K., T. Pulkkinen, J., Aalto, S. L., Suurnäkki, S., Kiuru, T., Tiirola, M., Kløve, B., & Ronkanen, A.-K. (2020). Enhanced nitrogen removal of low carbon wastewater in denitrification bioreactors by utilizing industrial waste toward circular economy. Journal of Cleaner Production, 254, 119973. https://doi.org/10.1016/j.jclepro.2020.119973Self-archived versionKiani, S., Lehosmaa, K., Kløve, B., & Ronkanen, A.-K. (2022). Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions. Ecological Engineering, 177, 106562. https://doi.org/10.1016/j.ecoleng.2022.106562Self-archived versionPulkkinen, J. T., Ronkanen, A.-K., Pasanen, A., Kiani, S., Kiuru, T., Koskela, J., Lindholm-Lehto, P., Lindroos, A.-J., Muniruzzaman, M., Solismaa, L., Klöve, B., & Vielma, J. (2021). Start-up of a “zero-discharge” recirculating aquaculture system using woodchip denitrification, constructed wetland, and sand infiltration. Aquacultural Engineering, 93, 102161. https://doi.org/10.1016/j.aquaeng.2021.102161Self-archived versionKiani, S., Khan, U. A., T. Pulkkinen, J., Kujala, K., Kløve, B., Ronkanen, A.-K. (2022).
Design parameters of woodchip bioreactors under cold climate conditions (from laboratory to full scale). Manuscript in preparation.TiivistelmäPuuhakebioreaktoreita on käytetty puhdistusratkaisuna veden nitraattipitoisuuden vähentämiseksi. Niiden ympärivuotinen käsittelyteho ja mahdolliset ratkaisut poistotehokkuuden parantamiseksi kylmissä ilmasto-olosuhteissa vaativat kuitenkin lisätutkimuksia. Tässä opinnäytetyössä tutkittiin typenpoistoa vesiviljelyn ja kaivosten puhdistusta vaativista vesistä sisä- ja ulkokäsittelyjärjestelmänä useissa koeolosuhteissa. Tässä työssä tunnistettiin suunnitteluparametreja (esim. optimaalinen HRT ja nitraatinpoistonopeus) ja parannusratkaisuja puuhakebioreaktoreille kylmissä ilmasto-olosuhteissa, kuten lisähiililähde, hydraulinen suunnittelu ja kelluvan vesikasvattamon käyttö hybridijärjestelmänä. Tulosten perusteella puulastubioreaktoreilla voidaan onnistuneesti poistaa nitraattia sekä sisäisen kierron kalankasvattamojen (RAS) että kaivosten kuormittamasta vedestä kylmissä ilmasto-olosuhteissa. Kahden vuoden tulokset täysimittaisella puuhakebioreaktorilla osoittivat, että laboratoriomittakaavassa valitut suunnitteluparametrit riittivät täyteen denitrifikaatioon täysimittaisessa mittakaavassa. Denitrifikaatio noudatti ensimmäisen järjestyksen reaktiota RAS- järjestelmänjäteveden osalta, ja optimaalinen HRT-aika vaihteli 1,5 ja 2 päivän välillä, jotta saavutettiin 25,8 g NO-3-N m-3d-1 ja 74 prosentin poistotehokkuus. 50 cm:n kerros kuivaa puuhaketta yhdistettynä lumipeitteeseen (20‐30 cm) riitti estämään järjestelmänjäätymisen, eikä veden lämpötila laskenut kokeen aikana alle 7,3 °C:n kylmien talviolosuhteiden aikana (ilman alin lämpötila = -24,7 ℃). Hybridiyksikön suunnittelua parannettiin lisäämällä kaksi sisälevyä veden virtauksen suuntaisesti ja kelluvaa koukkusammalta lisäämällä parannettiin hydraulista tehokkuutta huonosta (λ=0,06) tyydyttävään (λ= 0,51), mikä johti suurempiin poistomääriin.OsajulkaisutOsajulkaisut eivät sisälly väitöskirjan elektroniseen versioon.Kiani, S., Kujala, K., T. Pulkkinen, J., Aalto, S. L., Suurnäkki, S., Kiuru, T., Tiirola, M., Kløve, B., & Ronkanen, A.-K. (2020). Enhanced nitrogen removal of low carbon wastewater in denitrification bioreactors by utilizing industrial waste toward circular economy. Journal of Cleaner Production, 254, 119973. https://doi.org/10.1016/j.jclepro.2020.119973Rinnakkaistallennettu versioKiani, S., Lehosmaa, K., Kløve, B., & Ronkanen, A.-K. (2022). Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions. Ecological Engineering, 177, 106562. https://doi.org/10.1016/j.ecoleng.2022.106562Rinnakkaistallennettu versioPulkkinen, J. T., Ronkanen, A.-K., Pasanen, A., Kiani, S., Kiuru, T., Koskela, J., Lindholm-Lehto, P., Lindroos, A.-J., Muniruzzaman, M., Solismaa, L., Klöve, B., & Vielma, J. (2021). Start-up of a “zero-discharge” recirculating aquaculture system using woodchip denitrification, constructed wetland, and sand infiltration. Aquacultural Engineering, 93, 102161. https://doi.org/10.1016/j.aquaeng.2021.102161Rinnakkaistallennettu versioKiani, S., Khan, U. A., T. Pulkkinen, J., Kujala, K., Kløve, B., Ronkanen, A.-K. (2022).
Design parameters of woodchip bioreactors under cold climate conditions (from laboratory to full scale). Manuscript in preparation.Academic dissertation to be presented with the assent of the Doctoral Programme Committee of Technology and Natural Sciences of the University of Oulu for public defence in the Arina auditorium (TA105), Linnanmaa, on 8 December 2022, at 12 noonAbstract
Woodchip bioreactors have been used as an engineered solutions for mitigating nitrate from contaminated water. However, their year-round treatment performance and possible solutions for enhancing their removal efficiency under cold climate conditions still needs more research. In this thesis, we investigated nitrogen removal from aquaculture and mine-influenced water as an indoor and outdoor treatment system under several experimental conditions. This thesis attempts to identify design parameters (e.g., optimal hydraulic retention time (HRT) and nitrate removal rate) and enhancement solutions for woodchip bioreactors under cold climate conditions such as additional carbon source, hydraulic design and use of a floating aquatic as a hybrid system. The results show that woodchip bioreactors can successfully remove nitrate from recirculating aquaculture system (RAS) discharge and mine-influenced water under cold climate conditions. Two-year results from a full-scale woodchip bioreactor showed that selected design parameters from a laboratory-scale were sufficient to complete denitrification at the full-scale. The denitrification followed first-order reaction for RAS effluent and optimal HRT ranged between 1.5 to 2 d to achieve a nitrate removal rate of 25.8 g NO-3-N m-3d-1 and 74% removal efficiency. A layer of 50 cm of dry woodchips combined with snow cover (20‐30 cm) was sufficient to prevent frost, the water temperature never dropped lower than 7.3 °C during cold winter conditions (minimum air temperature = -24.7 ℃). Design of the hybrid unit was improved by inserting two inner plates along the water flow and adding floating hook-moss improved the hydraulic efficiency from poor (λ=0.06) to satisfactory (λ=0.51) which led to higher removal rates.Tiivistelmä
Puuhakebioreaktoreita on käytetty puhdistusratkaisuna veden nitraattipitoisuuden vähentämiseksi. Niiden ympärivuotinen käsittelyteho ja mahdolliset ratkaisut poistotehokkuuden parantamiseksi kylmissä ilmasto-olosuhteissa vaativat kuitenkin lisätutkimuksia. Tässä opinnäytetyössä tutkittiin typenpoistoa vesiviljelyn ja kaivosten puhdistusta vaativista vesistä sisä- ja ulkokäsittelyjärjestelmänä useissa koeolosuhteissa. Tässä työssä tunnistettiin suunnitteluparametreja (esim. optimaalinen HRT ja nitraatinpoistonopeus) ja parannusratkaisuja puuhakebioreaktoreille kylmissä ilmasto-olosuhteissa, kuten lisähiililähde, hydraulinen suunnittelu ja kelluvan vesikasvattamon käyttö hybridijärjestelmänä. Tulosten perusteella puulastubioreaktoreilla voidaan onnistuneesti poistaa nitraattia sekä sisäisen kierron kalankasvattamojen (RAS) että kaivosten kuormittamasta vedestä kylmissä ilmasto-olosuhteissa. Kahden vuoden tulokset täysimittaisella puuhakebioreaktorilla osoittivat, että laboratoriomittakaavassa valitut suunnitteluparametrit riittivät täyteen denitrifikaatioon täysimittaisessa mittakaavassa. Denitrifikaatio noudatti ensimmäisen järjestyksen reaktiota RAS- järjestelmänjäteveden osalta, ja optimaalinen HRT-aika vaihteli 1,5 ja 2 päivän välillä, jotta saavutettiin 25,8 g NO-3-N m-3d-1 ja 74 prosentin poistotehokkuus. 50 cm:n kerros kuivaa puuhaketta yhdistettynä lumipeitteeseen (20‐30 cm) riitti estämään järjestelmänjäätymisen, eikä veden lämpötila laskenut kokeen aikana alle 7,3 °C:n kylmien talviolosuhteiden aikana (ilman alin lämpötila = -24,7 ℃). Hybridiyksikön suunnittelua parannettiin lisäämällä kaksi sisälevyä veden virtauksen suuntaisesti ja kelluvaa koukkusammalta lisäämällä parannettiin hydraulista tehokkuutta huonosta (λ=0,06) tyydyttävään (λ= 0,51), mikä johti suurempiin poistomääriin
Performance and emission characteristics of a CI engine using nano particles additives in biodiesel-diesel blends and modeling with GP approach
No full textThe performance and the exhaust emissions of a diesel engine operating on nano-diesel-biodiesel blended fuels has been investigated. Multi wall carbon nano tubes (CNT) (40, 80 and 120 ppm) and nano silver particles (40, 80 and 120 ppm) were produced and added as additive to the biodiesel-diesel blended fuel. Six cylinders, four-stroke diesel engine was fuelled with these new blended fuels and operated at different engine speeds. Experimental test results indicated the fact that adding nano particles to diesel and biodiesel fuels, increased diesel engine performance variables including engine power and torque output up to 2% and brake specific fuel consumption (bsfc) was decreased 7.08% compared to the net diesel fuel. CO2 emission increased maximum 17.03% and CO emission in a biodiesel-diesel fuel with nano-particles was lower significantly (25.17%) compared to pure diesel fuel. UHC emission with silver nano-diesel-biodiesel blended fuel decreased (28.56%) while with fuels that contains CNT nano particles increased maximum 14.21%. With adding nano particles to the blended fuels, NOx increased 25.32% compared to the net diesel fuel. This study also presents genetic programming (GP) based model to predict the performance and emission parameters of a CI engine in terms of nano-fuels and engine speed. Experimental studies were completed
to obtain training and testing data. The optimum models were selected according to statistical criteria of root mean square error (RMSE) and coefficient of determination (R2). It was observed that the GP model can predict engine performance and emission parameters with correlation coefficient (R2) in
the range of 0.93–1 and RMSE was found to be near zero. The simulation results demonstrated that GP model is a good tool to predict the CI engine performance and emission parameters
Pragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
Free vibration of FG-CNT reinforced composite skew cylindrical shells using the Chebyshev-Ritz formulation
No full textIn the present research, the free vibration characteristics of a skew cylindrical panel made of functionally graded carbon nanotube reinforced composites (FG-CNTRCs) is investigated. A dual distribution of CNTs is considered across the panel thickness, namely a uniform and a nonuniform distribution. A refined rule of mixtures approach is applied to estimate the mechanical properties of the composite body, by means of the introduction of some efficiency parameters. A first order shear deformation shell theory (FSDT) is also combined with the Donnell's kinematic assumptions to determine the basic governing equations of the problem for thin-to-moderately thick shells. The governing equations are here referred to an oblique coordinate system, in order to handle any kind of boundary conditions. With the aid of the Ritz method, a system of homogeneous equations governs the eigenvalue problem, whose shape functions are built on Chebyshev polynomials. This system allows to compute the natural frequencies of the shell. A comparative evaluation of the formulation is performed to demonstrate its accuracy and efficiency. Further parametric studies are aimed at exploring the sensitivity of the response to some reinforcement parameters, as the volume fraction or the distribution of CNTs within the matrix
Dr. Edwin Wright Collection: Author Unknown
No full textNotes - The author relates several short stories about his neighbours including Alex McDonell, homesteading and life around Meanook and Athabasca (1 page
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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