Search results for "laatu"

Dark matters : contrasting responses of stream biofilm to browning and loss of riparian shading

2022

Concentrations of terrestrial-derived dissolved organic carbon (DOC) in freshwater ecosystems have increased consistently, causing freshwater browning. The mechanisms behind browning are complex, but in forestry-intensive regions browning is accelerated by land drainage. Forestry actions in streamside riparian forests alter canopy shading, which together with browning is expected to exert a complex and largely unpredictable control over key ecosystem functions. We conducted a stream mesocosm experiment with three levels of browning (ambient vs. moderate vs. high, with 2.7 and 5.5-fold increase, respectively, in absorbance) crossed with two levels of riparian shading (70% light reduction vs.…

Sunlit surface waters : exploring the photochemical reactivity of dissolved organic carbon

2017

In surface waters, solar radiation can photochemically mineralise the dissolved organic carbon (DOC, a measure of dissolved organic matter, DOM) to dissolved inorganic carbon (DIC). This DIC photoproduction constitutes an essential yet vague flux in the aquatic carbon cycling. The present thesis is based on the empirical assessment of the DOC photochemical reactivity, which was determined as the spectral apparent quantum yields (AQY) for DIC photoproduction. First, AQYs were determined in DOM solutions to quantify the impact of pH and DOM-associated iron. Then boreal lake waters were used for assessing the alteration of DOC photoreactivity due to water quality and catchment property. By sim…

Coupling of iron and dissolved organic matter in lakes–selective retention of different size fractions

2023

AbstractIncreasing concentration of iron (Fe) is observed in many boreal lakes, such as for the present study in Oslo Østmark, SE-Norway (1983–2018). As Fe-regulating processes are complex and dynamic, the link between mobilizing and retention processes is still not well understood. A seasonal study (2017–2018) from two headwaters, with medium and high dissolved organic matter (DOM) concentrations, showed that the loading of Fe to the lakes was highly dependent on flow conditions. Significantly higher values of Fe were related to autumn and winter periods with high runoff of highly colored and aromatic DOM compared to a severe drought period with minimum Fe values in the lakes. Compared to …

When Customer base is not loyalty! : Differences in the Consumers' Appraisal of Performance of Mobile Telecommunications Service Providers in Port Ha…

2017

Reports from both local and international telecommunications agencies attest that Nigerian telecommunications industry is the fastest growing in Africa and one of the fastest growing in the world. Currently, the sector boasts of about 157 million active subscribers being serviced by four dominant operators. However, there have been strident calls by consumers to the regulatory agencies to apply sanctions to the operators as a result of persistent poor quality of service. As a matter of fact, all the service providers do not deliver uniform level of service. This study is therefore aimed at examining the differences in the consumers’ appraisal of the quality of service and offerings of the s…

Disability, Health-Related Quality of Life and Mortality in Lumbar Spine Fusion Patients : A 5-Year Follow-Up and Comparison With a Population Sample

2022

Study Design: Prospective follow-up study. Objectives: We aimed to assess the effect of lumbar spine fusion (LSF) on disability, health-related quality of life and mortality in a 5-year follow-up, and to compare these results with the general population. Methods: 523 consecutive LSF operations were included in a prospective follow-up. Disability was assessed by the Oswestry Disability Index (ODI), and HRQoL by the 36-item Short Form (SF-36) questionnaire using the physical and mental summary scores (PCS and MCS). The patients were compared with an age-, sex-, and residential area matched general population cohort. Results: The preoperative ODI in the patients was 46 (SD 16), and the change …

Lukiopetuksen laatu : erityisopettajat, luokanopettajat, huoltajat ja oppilaat lukiopetuksen laadun arvioijina

2002

Tiimityö ja luottamus laboratoriossa

2000

Elämänlaatu päihdeongelmaisen läheisellä

2010

Tutkimuksen tarkoituksena oli selvittää päihdeongelmaisten henkilöiden läheisten elämänlaatua. Tutkittavat olivat Minnesota-hoidon perushoidossa olevien päihdeongelmaisten täysi-ikäisiä läheisiä (n = 41), joiden elämänlaatua tutkittiin Maailman terveysjärjestön (WHO) WHOQOL-BREF-kyselyllä ja läheissuhteen etäisyyden kyselyllä. Tutkimuksen tavoitteena oli tutkia läheisten yleistä elämänlaatua ja terveystyytyväisyyttä sekä fyysistä, henkistä ja sosiaalista elämänlaatua ja elämänlaadun ympäristöulottuvuutta. Lisäksi tarkasteltiin yleisen elämänlaadun ja terveystyytyväisyyden yhteyttä elämänlaadun ulottuvuuksiin sekä läheisen taustatietojen ja läheissuhteen etäisyyden yhteyttä koettuun elämänla…

Toolbox for Distance Estimation and Cluster Validation on Data With Missing Values

2022

Missing data are unavoidable in the real-world application of unsupervised machine learning, and their nonoptimal processing may decrease the quality of data-driven models. Imputation is a common remedy for missing values, but directly estimating expected distances have also emerged. Because treatment of missing values is rarely considered in clustering related tasks and distance metrics have a central role both in clustering and cluster validation, we developed a new toolbox that provides a wide range of algorithms for data preprocessing, distance estimation, clustering, and cluster validation in the presence of missing values. All these are core elements in any comprehensive cluster analy…

Adolescents with poorly controlled type 1 diabetes : psychological flexibility is associated with the glycemic control, quality of life and depressiv…

2021

This study investigates the role of psychological flexibility in relation to glycaemic control (HbA1c) and quality of life among adolescents with poorly-controlled diabetes. Adolescents (n = 65, aged 12–16 years) completed the Children and Adolescents Mindfulness Measure (CAMM), the Diabetes Acceptance and Action Scale for Children and Adolescents (DAAS), the Depression Scale (RBDI), and the Health-Related Quality of Life Scale (KINDL-R). HbA1c values were collected from medical records. A higher level of psychological flexibility was associated with better glycaemic control, better quality of life, and lower levels of depressive and anxiety symptoms. Mediation analysis showed that diabetes…