Search results for "SDA"
showing 10 items of 99 documents
Impact of the Hypoechogenicity Criteria on Thyroid Nodule Malignancy Risk Stratification Performance by Different TIRADS Systems
2021
Background: Various Thyroid Imaging and Reporting data systems (TIRADS) are used worldwide for risk stratification of thyroid nodules. Their sensitivity is high, while the specificity is suboptimal. The aim of the study was to compare several TIRADS systems and evaluate the effect of hypoechogenicity as a sign of risk of malignancy on the overall assessment of diagnostic accuracy. Methods: The prospective study includes 274 patients with 289 thyroid nodules to whom US and risk of malignancy were assessed according to four TIRADS systems—European (EU-TIRADS), Korean (K-TIRADS), TIRADS by American College of Radiology (ACR TIRADS), and modified Kwak et al. TIRADS (L-TIRADS) systems, in which …
Soil chemical and biochemical properties of a salt-marsh alluvial Spanish area after long-term reclamation
2009
Marisma, one of the largest salt-marsh alluvial areas in SW Spain, has been reclaimed since 1970 by artificial drainage and amendment with phosphogypsum (PG) so as to reduce Na+ saturation. Within the reclaimed area, two 250- × 20-m plots were treated as follows: (1) amendment with 25 Mg/ha of PG every 2 to 3 years between 1979 and 2003 (plot PY); (2) like PY but PG treatment stopped after 1997 (plot DR). A contiguous virgin Marisma salt-marsh plot (MV), neither drained nor amended, was the control. In MV, soil microbial biomass C, most enzyme activities and total organic C content were much greater than in PY and DR soils, despite the salinity stress. The decrease in soil organic matter co…
Ikdienas ieradumu un viscerālo tauku ietekme uz muguras lejasdaļas sāpēm cilvēkiem ar normālu ķermeņa masas indeksu
2019
Darba nosaukums: Ikdienas ieradumu un viscerālo tauku ietekme uz muguras lejasdaļas sāpēm cilvēkiem ar normālu ĶMI. Tiek uzskatīts, ka mugurkaulāja problēmas, tāpat kā aptaukošanās ir izplatīta problēma straujā dzīvesveida izmaiņu un tehnoloģiju attīstības dēļ. Tomēr nav skaidri izprasts patoģenēzes mehānisms, kas rada muguras lejasdaļas sāpes. Kā dažus no iespējamiem iemesliem literatūrā atzīmē faktorus, kas tieši vai netieši saistīti ar viscerālo tauku uzkrāšanos (Schepper et al. 2010; De Almeida et al. 2007). Taukaudu veidošanās process ir sarežģīts un vēl nav pietiekami izskaidrots (Currie et al. 2012). Mērķis: Noskaidrot ikdienas paradumu ietekmi uz muguras lejasdaļas sāpēm un šo sāpju…
Evaluation of the effect of chance correlations on variable selection using Partial Least Squares -Discriminant Analysis
2013
Variable subset selection is often mandatory in high throughput metabolomics and proteomics. However, depending on the variable to sample ratio there is a significant susceptibility of variable selection towards chance correlations. The evaluation of the predictive capabilities of PLSDA models estimated by cross-validation after feature selection provides overly optimistic results if the selection is performed on the entire set and no external validation set is available. In this work, a simulation of the statistical null hypothesis is proposed to test whether the discrimination capability of a PLSDA model after variable selection estimated by cross-validation is statistically higher than t…
The Potsdam Open Source Radio Interferometry Tool (PORT)
2021
The Potsdam Open Source Radio Interferometry Tool (PORT) is the very long baseline interferometry (VLBI) analysis software developed and maintained at the GFZ German Research Centre for Geosciences. Chiefly, PORT is tasked with the timely processing of VLBI sessions and post-processing activities supporting the generation of celestial and terrestrial reference frames. In addition, it serves as a framework for research and development within the GFZ's VLBI working group and is part of the tool set employed in educating young researchers. Starting out from VLBI group delays, PORT estimates station and radio sources positions, as well as Earth orientation parameters, tropospheric parameters, a…
Taxonomic and environmental implication of pedotechnique in large scale farming
2016
Abstract Human activities that involve deep modifications of the soils and a substantial deterioration of their features are numerous and very diverse. Such activities are considered as pedotechniques and, in large-scale farming, are used only under the boost of significant economic returns. In these last decades, the pedotechniques used to tailor soils suitable for table vine cultivation in the Acate valley (Sicily, Italy), not only led to objective difficulties in the classification of these deeply transformed soils but also, to several environmental hazards. In this work after considering the pedotechniques used in tailoring suitable soil for table vine cultivation, we propose to introdu…
Impact of phosphate fertilization and arboreal mycorrhization on the development of micropropagated walnut rootstocks
2021
This phD is part of the CASDAR MycoAgra project. The aim of the PhD is to understand mycorrhiza mechanisms in an agroforestry integrated culture system between walnut tree and corn culture; and to found out mycorrhiza impact on the global production. To identify which cultivation practices permit the best mycorrhiza fungi development, our study is organized in two axes of work: - We first want to know the impact of interculture on the common mycorrhizal network. - And the impact of nitrogen content in the soil on the common mycorrhizal network To the end, we expect to purpose to farmers crop itineraries that used as less as we can synthetic fertilizers, through alternative system.
Observations of land use transformations during the Neolithic using exploratory spatial data analysis: contributions and limitations
2010
International audience; The settlement pattern analysis in archaeology implies some methodological questions. In this paper, we question some issues about the use of geostatistical methods for the observation of land use transformations during the Neolithic. We have developed two examples in Burgundy (France): the first one on a regional scale and the second one on a micro-regional scale. Using different ESDA approaches (Ripley’K function, Nearest Neighbour Distance, Kernel Density Estimation), we would like to underline what the methodological and archaeological contributions and their limits are. Both experiences point out that the results obtained depend not only on the analytical scale,…
Emocionāli vizuāla stimula ietekme uz zīlītes diametru un sirdsdarbības frekvenci
2016
Bakalaura darbs ir uzrakstīts latviešu valodā uz 31 lapām. Tas satur 18 attēlus, 1 tabulu, 3 pielikumus un 31 atsauci uz literatūras avotiem. Darba mērķis: novērtēt, vai dažādu emocionālo noskaņu vizuālie stimuli ietekmē acs zīlītes diametra un sirdsdarbības frekvences izmaiņas jaunu, pieaugušu cilvēku grupā. Metode: Sirdsdarbības frekvence un zīlītes diametrs tika reģistrēts, skatoties emocionāli pozitīvus, negatīvus un neitrālus attēlus. Rezultāti: Negatīvs emocionāli vizuāls stimuls acs zīlītes diametru palielināja, un tas bija statistiski nozīmīgi, salīdzinot ar neitrālu (p=0,0001) un pozitīvu (p=0,00007) stimulu. Secinājumi: Emocionāli negatīvam vizuālam stimulam ir visizteiktākā ietek…
Nasdaq Baltic kapitāla un parāda vērtspapīru tirgus un tā attīstības iespējas
2020
Bakalaura darba tēma ir „Nasdaq Baltic kapitāla un parāda vērtspapīru tirgus un tā attīstības iespējas”. Temata aktualitāti autors pamato ar relatīvi zemo vērtspapīru tirgus kapitalizāciju Latvijā un Baltijā kopumā, tirgus nozīmi valstu tautsaimniecībā un tā ietekmi ekonomiskās izaugsmes nodrošināšanā. Bakalaura darbā tiek analizēts akciju un parāda vērtspapīru tirgus teorētiskie aspekti un to nozīme ekonomikā, sākotnējā publiskā vērtspapīru piedāvājuma nozīme un sekundārais vērtspapīru tirgus. Tiek izpētīta Latvijas vērtspapīru tirgus līdzšinējā attīstība līdz Nasdaq Baltic izveidei, analizējot kopējo Nasdaq Baltic emitentu struktūru, akcentējot Latvijas tirgus daļu, identificējot un klasi…