Search results for " function"
showing 10 items of 9395 documents
Aberrant brain functional networks in type 2 diabetes mellitus: A graph theoretical and support-vector machine approach
2022
ObjectiveType 2 diabetes mellitus (T2DM) is a high risk of cognitive decline and dementia, but the underlying mechanisms are not yet clearly understood. This study aimed to explore the functional connectivity (FC) and topological properties among whole brain networks and correlations with impaired cognition and distinguish T2DM from healthy controls (HC) to identify potential biomarkers for cognition abnormalities.MethodsA total of 80 T2DM and 55 well-matched HC were recruited in this study. Subjects’ clinical data, neuropsychological tests and resting-state functional magnetic resonance imaging data were acquired. Whole-brain network FC were mapped, the topological characteristics were ana…
Executive function and life-space mobility in old age
2018
Life-space assessment incorporates all movements in terms of the distance from home, the frequency of movement and the need of assistance for movement. Executive function (EF) is an important higher order cognitive ability that controls and guides people’s goal-directed actions. We examined the cross-sectional and longitudinal associations between EF and life-space mobility, and investigated if perceived walking difficulties, lower extremity performance, and transportation difficulties explain the association. Methods 157 community-dwelling persons aged 76–91 years participated in the study at the baseline, and 103 of them in 2-year follow-up study. Based on the distribution on the Trail Ma…
The combined effect of lower extremity function and cognitive performance on perceived walking ability among older people : a 2-year follow-up study
2018
Background We studied the combined effects of cognitive performance and lower extremity function on self-reported walking modifications and walking difficulty and on self-reported walking difficulty incidence over a 2-year follow-up. Methods A total of 848 community-dwelling older people aged 75-90 years participated at baseline, 816 at the 1-year follow-up, and 761 at the 2-year follow-up. Baseline lower extremity function was measured with the Short Physical Performance Battery (<10 vs. ≥10) and cognitive performance with the Mini-Mental State Examination (<24 vs. ≥24). Difficulty in walking 2 km was self-reported and categorized into no difficulties, no difficulties but walking modificat…
Kompleksy metali przejściowych z zasadami Lewisa jako prekursory katalizatorów polimeryzacji olefin. Cz. II. Postęp w komputerowym projektowaniu kata…
2001
Dokonano przeglądu prac dotyczących komputerowego projektowania katalizatorów do polimeryzacji olefin z punktu widzenia wpływu katalizatorów na przebieg tego procesu. Omówiono osiągnięcia w teoretycznym przewidywaniu katalitycznych właściwości kompleksów metali przejściowych, które dokonały się dzięki zrozumieniu mechanizmu polimeryzacji, charakteru centrów aktywnych, przyczyn aktywności takich katalizatorów oraz roli poszczególnych ich składników. Przedstawiono również zagadnienia, na których prawdopodobnie skupią się obecne i przyszłe prace teoretyczne w dziedzinie polimeryzacji koordynacyjnej (rola kokatalizatorów i zasad Lewisa dodawanych do układów katalitycznych, wpływ warunków doświa…
Functional structure of European forest beetle communities is enhanced by rare species
2022
Biodiverse communities have been shown to sustain high levels of multifunctionality and thus a loss of species likely negatively impacts ecosystem functions. For most taxa, however, roles of individual species are poorly known. Rare species, often most likely to go extinct, may have unique traits and functional roles. Alternatively, rare species may be functionally redundant, such that their loss would not disrupt ecosystem functions. We quantified the functional role of rare species by using captures of wood-living (saproxylic) beetle species, combined with recent databases of morphological and ecological traits, from three regions in central and northern Europe. Using a rarity index based…
Style partycypacji kulturalnej człowieka dorosłego : walidacja narzędzia pomiarowego
2017
Artykuł przedstawia proces walidacji narzędzia pomiarowego, diagnozującego style partycypacji kulturalnej człowieka dorosłego. Jego celem jest opis uzyskanych wyników w poszczególnych etapach walidacji oraz określenie związku pomiędzy stylami partycypacji kulturalnej a układami kultury prezentowanymi przez socjologów kultury. W związku z czym przedmiotem badań jest styl partycypacji kulturalnej człowieka dorosłego. Badania pilotażowe, jak i właściwe zostały przeprowadzone w województwie opolskim, próba badawcza kolejno liczyła 100, a następnie 400 respondentów. Za podstawę teoretyczno-metodologiczną rozważań przyjęto konstrukt teoretyczny Kazimierza Obuchowskiego, opisujący podmiotowy oraz …
Calculation of magnetic coupling constants with hybrid density functionals
2013
The currently available computational methods for the calculation of magnetic coupling constants with density functional theory have been reviewed. These methods include modern approximations to the exchangecorrelation functional, such as hybrid, range-separated and double-hybrid functionals, as well as approaches to treat the severe spin symmetry problems encountered in density functional calculations of magnetic interactions. In addition to the commonly used unrestricted Kohn–Sham formalism, density functional methods based on multireference wave functions and ensemble densities are also discussed. Performance of these models based on various studies has been summarized. The results indic…
Requirements for using simulation to design and assess wireless ATM handover solutions
1999
Wireless ATM (WATM) has been widely considered as a solution for broadband wireless services. Handover is one of the most important mobility support functions in the WATM network. Many handover solutions have been proposed, analysed, and benchmarked. Simulations have been broadly used to assess these solutions. However, there are many dilemmas in how simulation has been applied as a research methodology: heterogeneous simulation systems used, lack of comparison with other related work, biased conclusions, and unavailability of simulation models and systems to researchers. The WATM research community lacks a standard and commonly acceptable methodology for applying simulation. To address thi…
Līdzību pragmalingvistiskā analīze
2019
Bībeles stāsti, kurus Evaņģēlijā sauc par līdzību stāstiem vai parabolām ir biblisks žanrs, kas ir pētīts pēdējo desmitgāžu laikā. Šajā periodā šos stāstus sāka analizēt no tekstuālās, literārās, un vēsturiskās perspektīvas. Pētījumi atklāj, ka zinātniska pieeja ir nepieciešama, lai izprastu un izskaidrotu Bībeles stāstus. Darbā tiek izmantots novatoriska perspektīva un divu līmeņu parabolu nozīmju analīze. Semantiskās nozīmes analīzē tika pētīta teksta literārā nozīme, tā atklāja gan parabolu raksturīgās pazīmes, gan lingvistisko līdzekļu un stratēģiju izmantojumu burtiskās nozīmes izveidošanā. Pragmatiskās nozīmes analīzē uzmanība tika vērsta uz pārnesto un konteksta nozīmi. Pragmatiskās …
Apstākļi un darbības vārdu formas T.Hārdija romānā "Kāsterbridžas mērs"
2020
Šis pētījums tika uzsākts, ņemot vērā T.Hārdija darbu popularitātes kritumu un secīgu pieaugumu pēdējās desmitgades laikā, kā arī darbības vārdu un apstākļu nozīmi daiļliteratūrā. Pētījuma mērķis bija analizēt, kā autors lieto darbības vārdu formas un apstākļus romānā Kāsterbridžas mērs, raksturojot varoņus un pildot valodas funkcijas. Tika izmantota jauktā pētījuma metode, apvienojot diskursa analīzi un kvantitatīvu pieeju stilistiskajai analīzei. Pētījuma rezultātā tika atklāts, ka ar darbības vārdu formu palīdzību autors nosaka sižeta attīstības straujumu; tie apstākļi, kas galvenokārt izmantoti ar komunikācijas darbības vārdiem, ļauj izdarīt secinājumus par romāna varoņu īpašībām; starp…