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The Influence of Meteorological Parameters on Birch Pollen Concentration in the Air
No full textBakalaura darba tēma ir meteoroloģisko rādītāju ietekme uz bērza ziedputekšņu koncentrāciju gaisā. Par pētījuma objektu tika ņemti tieši bērza ziedputekšņi, jo bērzs ir visbīstamākais elpceļu un cita veida alerģijas izraisītājs Latvijas teritorijā. Darbā tiek raksturots kādā veidā meteoroloģiskie rādītāji (temperatūra, nokrišņu daudzums, vēja stiprums un virziens, gaisa spiediens, relatīvais mitrums, mākoņu daudzums) ietekmē ziedputekšņu koncentrāciju. Tiek sniegta jauna interpretācija bērza ziedputekšņu sezonas sākuma datumiem.
Darbu veido 5 pamatnodaļas ar 12 apakšnodaļām, ko ilustratīvi papildina 12 attēli un 4 tabulas darba pamatnodaļā un 9 pielikumos.
Atslēgvārdi: Aerobioloģija, aerobioloģiskais monitorings, Burkard uztvērējs, ziedputekšņu koncentrācija, ziedputekšņu transports, bērzs, meteoroloģiskie rādītāji.The theme of this Bachelor Paper is „The influence of Meteorological parameters on Birch pollen Concentration in the Air”. Investigation object is birch pollen, because of the fact that birch is the most dangerous founder of the respiratory tract and other types of allergy. The paper describes how the meteorological indices (temperature, wind speed and direction, rainfall, cloudiness, level of humidity) impact birch pollen concentration in the air. The author of the paper worked out the new birch pollen interpretation for the dates of pollination season start.
The paper consists of 5 chapters with 12 sub-chapters, 12 figures, 4 tables and 9 appendixes.
Key words: Aerobiology, pollen concentration, Burkard pollen trap, pollen transportation, birch, meteorological parameter
Ģeotelpisko un temporālo putekšņu sezonas izmaiņu prognozēšana Eiropā ar statistisko un deterministisko modelēšanu
No full textPromocijas darbs ir pētījums par temporālo un ģeotelpisku putekšņu sezonas prognozēšanu. Pētījuma pirmā daļā, pēc 12 gadu diennakts datiem tika izveidots lokāls modelis diennakts putekšņu prognozēšanai Rīgā ar precizitāti virs 80%. Otrā pētījumā tika izveidots universāls modelis nākamā gada sezonālā putekšņu indeksa prognozēšanai Ziemeļeiropā ar precizitāti līdz 92%. Promocijas darba trešā daļa tika veltīta olīvu putekšņu modeļu ansambļa izveidei Eiropā. Pierādīts, ka sešu modeļu ansamblis darbojas ievērojami labāk par katru atsevišķu modeli. Tika secināts, ka ir iespējams prognozēt putekšņu daudzumu gaisā dažādos temporālos mērogos – pēc meteoroloģiskās situācijas aprēķināt nākamā gada sezonālo putekšņu indeksu un pēc lokālās meteoroloģiskās prognozes datiem, prognozēt diennakts putekšņu koncentrāciju noteiktā vietā.The thesis introduces forecasting of the temporal and geospatial patterns of pollen season in Europe through complex, multi-step transformation of data and parametric statistical analysis. The first part develops a local flowering model for Riga based on 12 years of data and it’s accuracy exceeds 80%. The second model shows regional-scale predictions of seasonal pollen index for the region of Northern Europe is universally applicable to the entire region with accuracy up to 92%. The third part describes an optimised ensemble built over simulations of six forecasting models for olive pollen over Europe in 2014 and it noticeably improves the accuracy of the pollen forecasts generated by the individual models and simple ensembles built over their predictions
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Investigation of Birch Pollen Concentrations in Air and It Influencing Factors for the Years 2003-2009 in Latvia
No full textMaģistra darba tēma ir bērza putekšņu koncentrācijas gaisā un to noteicošo faktoru izpēte Latvijā 2003.-2009. gadā. Darbā tiek raksturots, kādā veidā bērza produktivitātes periodiskums, putekšņu sezonas garums un meteoroloģiskie rādītāji (gaisa un augsnes temperatūra, nokrišņu summas, gaisa relatīvais mitrums, vēja virziens un stiprums, gaisa spiediens) ietekmē bērza putekšņu koncentrāciju gaisā. Tiek aprakstītas, raksturotas un analizētas dažādas bērza putekšņu sezonas definīcijas un tās aprēķināšanas metodes.
Izteikta gaisa temperatūras ietekme tika konstatēta pirms sezonas vai bērza putekšņu sezonas sākumā, savukārt pārējo meteoroloģisko rādītāju ietekme jūtama visas sezonas garumā.
Atslēgas vārdi: aerobioloģija, bērza putekšņu koncentrācija, bērza putekšņu sezona, meteoroloģiskie rādītāji, Latvija.The title of the master thesis is the investigation of birch pollen concentration in the air and its influencing factors in Latvia in the years 2003-2009. The paper describes how the influencing factors (periodicity of birch pollen productivity; length of pollen season; meteorological indices such as air and soil temperature, precipitation, relative humidity, wind speed and direction, atmospheric pressure) impact birch pollen. The definitions of birch pollen seasons and evaluative methods have been described and analysed.
The influence of air temperature is stated before and at the beginning of the birch pollen season, however, the influence of the other meteorological indices is felt during the whole birch pollen season.
Keywords: aerobiology, birch pollen concentration, birch pollen season, meteorological parameters, Latvia
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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