Search results for "ANO"

Tailoring the interaction between a gold nanocluster and a fluorescent dye by cluster size : creating a toolbox of range-adjustable pH sensors

2022

We present a novel strategy for tailoring the fluorescent azadioxatriangulenium (KU) dye-based pH sensor to the target pH range by regulating the pKa value of the gold nanoclusters. Based on the correlation between the pKa and surface curvature of ligand-protected nanoparticles, the pKa value of the gold nanoclusters was controlled by size. In particular, three different-sized para-mercaptobenzoic acid (p-MBA) protected gold nanoclusters, Au25(p-MBA)18, Au102(p-MBA)44, and Au210–230(p-MBA)70–80 were used as the regulator for the pH range of the KU response. The negatively charged gold nanoclusters enabled the positively charged KU to bind to the surface, forming a complex and quenching the …

Eemu Myntti : elämä ja ihmiskuvat

2008

Acoustic wave tunneling across a vacuum gap between two piezoelectric crystals with arbitrary symmetry and orientation

2022

It is not widely appreciated that an acoustic wave can “jump” or “tunnel” across a vacuum gap between two piezoelectric solids, nor has the general case been formulated or studied in detail. Here, we remedy that situation, by presenting a general formalism and approach to study such an acoustic tunneling effect between two arbitrarily oriented anisotropic piezoelectric semi-infinite crystals. The approach allows one to solve for the reflection and transmission coefficients of all the partial-wave modes, and is amenable to practical numerical or even analytical implementation, as we demonstrate by a few chosen examples. The formalism can be used in the future for quantitative studies of the …

Rakstura stipro pušu un attieksmes pret novecošanos saistība vēlīnā briedumā

2020

Pētījuma tēma: Rakstura stipro pušu un attieksmes pret novecošanos saistība vēlīnā briedumā Aktualitāte - Cilvēka dzīves gaitā viņam nākas saskarties ar dažādām pārmaiņām, jaunu sociālo lomu apgūšanu un arī tīri fizioloģiskām pārmaiņām, kas visbiežāk ir kaut kas nezināms un biedējošs. Līdzīgi arī tuvošanās pensionēšanās vecumam ir saistīta ar dažādām fiziskām, emocionālām un sociālām pārmaiņām, kas ir saistītas ar dabisku novecošanos. Taču ir svarīgi, lai novecošanās, tuvošanās vēlīnajam brieduma periodam, notiktu pēc iespējas pozitīvāk un veselīgāk. Ir tikuši veikti dažādi pētījumi par rakstura stipro sakarībām, piem., ar dzīves jēgas izjūtu (Littman-Ovadia & Steger, 2010), labāku noskaņoj…

Mācību pieturas kā metode Latvijas kultūras kanona apguvē kulturoloģijā

2020

Diplomdarba „Mācību pieturas kā metode Latvijas kultūras kanona apguvē kulturoloģijā” mērķis ir apzināt mācību pieturas kā metodes izmantošanas iespējas, temata „Latvijas kultūras kanons” apguvē kulturoloģijā vidusskolā. Tika pētīti Latvijas kultūras kanona izveides mērķi, tie salīdzināti ar citu Eiropas valstu kultūras sarakstu veidošanas nolūkiem. Darbā apskatīti mācību pieturu organizēšanas principi. Tika izstrādāti mācību stundu plāni, mācību pieturu materiāli Latvijas kultūras kanona vērtību apguvei šādās nozarēs: tautas tradīcijas, arhitektūra un dizains, kino, skatuves māksla. Izpētes procesa laikā tika secināts, ka metode veicina skolēnu aktivitātes un motivācijas pieaugumu. Darbs s…

Effects of Physical and Cognitive Training on Gait Speed and Cognition in Older Adults : A Randomized Controlled Trial

2021

Gait speed is a measure of health and functioning. Physical and cognitive determinants of gait are amenable to interventions, but best practices remain unclear. We investigated the effects of a 12‐month physical and cognitive training (PTCT) on gait speed, dual‐task cost in gait speed, and executive functions (EFs) compared to physical training (PT) (ISRCTN52388040). Community‐dwelling older adults, who did not meet physical activity recommendations, were recruited (n=314). PT included supervised walking/balance (once weekly) and resistance/balance training (once weekly), home exercises (2‐3 times weekly) and moderate aerobic activity 150 minutes/week in bouts of >10 minutes. PTCT included …

Consolidation tests on the graffiti of the Steri’s prison with nanotechnological Ca(OH)2 dispersed in iso-propanol

2009

The combination of weathering and human activities often induce pyhisicochemical alteration on the surface of wall paintings. One of the most still largely used restoration techniques for these works of art, is based on the application of organic polymers. Due to their ability to stick detached and powdered pigments,these products provide an immediate consolidating effects. Unfortunately, both their aging and their pyhisicochemical incompatibility with the inorganic support can have serious consequences also causing further damage to the work of art. In this paper a new technological approach is presented based on the use of Ca(OH)2 nanoparticles dispersed in isopropanol. Some applicative t…

Doslidžennâ bìologìčnoï aktivnostìvtorinnogo ekstraktu zì šrotu travimaterinki zvičajnoï (Origanum vulgare)

2015

Studied the antimicrobial activity of secondary extract from oregano herbs waste (Origanum vulgare)against 7 standard test strains of microrganisms. Minimum bactericidal concentration of the extract to Staphylococcus aureus ATCC 6538 P-is 3.125-6.25 mg/ml and 6.25-12.5 mg/ml to gram-negative bacteria and Candida albicans ATCC 10231.Total antioxidant activity determined by DPPH, secondary extract at a concentration of 400 ug/ml was 92 %. The tested extract had photoprotective activity. Obtained results confirm the perspective of using waste of oregano herbs for making extracts and creation on their basis of pharmaceuticals, veterinary drugs and cosmetics.

Biopolymer Recovery from Aerobic Granular Sludge and Conventional Flocculent Sludge in Treating Industrial Wastewater: Preliminary Analysis of Differ…

2022

The recovery of biopolymers from sewage sludge could be a crucial step in implementing circular economy principles in wastewater treatment plants (WWTP). In this frame, the present study was aimed at evaluating the simultaneous production of polyhydroxyalkanoates (PHA) and extracellular polymeric substances (EPS) obtainable from the treatment of agro-industrial wastewater. Two biological enrichment systems, aerobic granular sludge (AGS) and a conventional activated sludge operating as a sequencing batch reactor (SBR), were monitored for 204 and 186 days, respectively. The maximum biopolymers accumulation capacity was close to 0.60 mgPHA-EPS gVSS−1 in the AGS when operating at 3 kgCODm…

Electrochemical treatment of real wastewater with low or high conductivity

2018

In the last years, many efforts have been devoted to the development of electrochemical processes for the effective treatment of wastewater contaminated by organic pollutants resistant to conventional biological processes and/or toxic for microorganisms [1–5]. It was shown that some electrochemical approaches, including the direct anodic oxidation at suitable anodes such as boron-doped diamond (BDD) and/or electro-Fenton (EF) at suitable operating conditions and cells [1–6] can allow to treat effectively a very large number of organic pollutants. However, most of the investigations were performed using synthetic wastewater. Hence, it is now mandatory to study the problems connected to the p…