Search results for "TSA"
showing 10 items of 521 documents
Tautas saimniecība: Savienotās republikas tautsaimniecības pārvaldes ekonomiskās problēmas. Darba ražīguma kāpinājuma problēmas rūpniecībā Latvijas P…
1990
Krājumā aplūkoti jaunā saimnieciskā mehānisma veidošonās jautājumi tautsaimniecības vadīšanā republikas ekonomiskās patstāvības apstākļos. Otrajā daļā doti zinātnisko pētījumu starprezultāti darba ražīguma kāpināšanā rūpniecībā un celtniecībā.
Humusvielu izcelsmes – īpašību izpēte izmantojot to multiparametru raksturojumu
2019
Humusvielu izcelsmes-īpašību izpēte izmantojot to multiparametru raksturojumu. Upska K., zinātniskais vadītājs prof., Dr. habil. chem. Kļaviņš M. prof. Dr.chem. Vīksna A. un, Kursa darbs, 62 lappuses, 22 attēli, 11 tabulas, 37 literatūras avoti, 2 pielikumi. Latviešu valodā. Bakalaura darbā tika apkopota zinātniskā literatūra par humusvielām, to izcelsmi, funkcijām biosfērā, ražošanas, izdalīšanas un pētīšanas metodēm. Tika noteikts humusvielu organiskais un neorganiskais elementsastāvs, kas sniedz informāciju par rūpnieciski ražotu humusvielas produktu kvalitāti. Izmantojot UV-Vis un FTIR molekulārās absorbcijas metodi tika uzņemti un analizēti humusvielu absorbcijas spektri. Izmantojot fl…
Living alone and positive mental health: a systematic review
2019
Background Living alone has become more common in today’s societies. Despite the high number of the population living alone, research directed towards the mental wellbeing issues related to living alone has been limited. This systematic literature review aimed to assess the association between living alone and positive mental health. Methods We conducted searches in Medline, Web of Science, Cochrane Library, CINAHL, PsycINFO, and other complementary databases from January 1998 to May 2019. Randomised trials and observational studies investigating adults over 18 years of age and living alone (defined as living in a single household or a household size of one person) were eligible. The primar…
The Effect of a Ketogenic Low-Carbohydrate, High-Fat Diet on Aerobic Capacity and Exercise Performance in Endurance Athletes: A Systematic Review and…
2021
A low-carbohydrate, high-fat (LCHF) diet has been proposed to enhance the fat utilization of muscle and the aerobic capacity of endurance athletes, thereby improving their exercise performance. However, it remains uncertain how the macronutrient intake shift from carbohydrate to fat affects endurance exercise training and performance. This study performed a systematic review and meta-analysis to explore the effects of a ketogenic low-carbohydrate, high-fat (K-LCHF) diet on aerobic capacity and exercise performance among endurance athletes. Searches were carried out in five electronic databases, and we followed the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) gu…
How to evaluate first aid skills after training: a systematic review
2022
Abstract Background To be able to help and save lives, laypersons are recommended to undergo first aid trainings. The aim of this review was to explore the variety of the elements of the measuring systems to assess the effects of first aid trainings on different aspects of first aid skills including practical skills, knowledge, and emotional perspectives. Methods This systematic literature review used Scopus and PubMed databases and searched for studies published between January, 2000, and December, 2020. Out of 2,162 studies meeting the search criteria, 15 studies with quantitative and repeatable evaluation methods to assess first aid skills after first aid training for adults were include…
Physical fitness profile in female horseback riders.
2019
BACKGROUND: The purpose of the present study was to examine the levels of endurance and neuromuscular performance variables in female horseback riders. METHODS: 52 female Finnish riders were involved (age 29.4±8.9 yrs, height 1.68±0.06 m, weight 67.5±10.0 kg), 19 show-jumping riders (SJ) and 33 eventing riders (E), riding-time minimum of 4 times/week, jumping level of minimum 1.06±0.11m. The measurements were maximal bilateral isometric leg press force (MVCLP), maximal unilateral isometric knee extension (MVCKE) and flexion forces (MVCKF), countermovement jump (CMJ), maximal isometric force of the trunk extensor and flexor muscles (MVCE, MVCF), weight distribution of the body (WD), handgrip…
Effects of strength vs. endurance training and their combination on physical performance characteristics in female horseback riders
2020
BACKGROUND: The purpose of this study was to investigate effects of strength (S), endurance (E) and concurrent strength and endurance (SE) training on neuromuscular and cardiorespiratory characteristics during the 12-week volume-equated protocols in female horseback riders. METHODS: Subjects (N=44) (29.4±8.9 yrs) were assigned to S (n=11), E (n=11), SE (n=13) and control (C) (n=9) groups. Training consisted of progressive S, E or SE training 3x/week and riding exercise 4-6x/week. The measurements included maximal isometric bilateral leg press force (MVCLP) and EMG of VL and BF muscles, rapid isometric force production (0-500ms), maximal force of trunk extensor/flexors (MVCE/MVCF), countermo…
Early Life Influences on Hearing in Adulthood : a Systematic Review and Two-Step Individual Patient Data Meta-Analysis
2021
Objectives: Adverse prenatal and early childhood development may increase susceptibility of hearing loss in adulthood. The objective was to assess whether indices of early development are associated with adult-onset hearing loss in adults ≥18 years. Design: In a systematic review and meta-analysis, four electronic databases were searched for studies reporting associations between indices of early development (birth weight and adult height) and adult-onset hearing loss in adults ≥18 years. We screened studies, extracted data, and assessed risk of bias. Authors were contacted to provide adjusted odds ratios from a logistic regression model for relationships between birth weight/adult height a…
Anodizing and post-anodizing processes to enhance corrosion resistance of Al alloys
2021
In this work the dependence of corrosion resistance of Al alloys AA 2024-T3 on sealing treatments was studied. AA 2024-T3 samples were anodized at 14 V in a bath containing sulfuric and tartaric acids. Anodized samples were sealed with four different treatments: hot water, vapour, hot water with salts and stirred hot water. Electrochemical Impedance Spectroscopy measurements were performed to estimate samples' corrosion resistance in a solution simulating sea water environment. Samples sealed in hot water showed the highest corrosion resistance.
Uso de los museos para contribuir a superar visiones deformadas de la ciencia
2017
El trabajo se centra en la aportación de la educación no reglada, y más concretamente de los museos de ciencia y tecnología, al proceso de alfabetización científica. La enseñanza de las ciencias no facilita, en general, la familiarización de los estudiantes con las estrategias propias del trabajo científico. Y lo mismo sucede con la educación científica proporcionada por museos, medios de difusión, etc. Por ello las concepciones de los estudiantes y de la ciudadanía sobre la naturaleza de la ciencia y la actividad científica muestran, habitualmente, graves deformaciones que no solo dificultan un aprendizaje significativo sino que provocan el desinterés y rechazo hacia los estudios tecnocien…