Search results for "Note"

A metal-responsive interdigitated bilayer for selective quantification of mercury( ii ) traces by surface plasmon resonance

2016

Reusable surface plasmon resonance chips allowing the quantitative and selective detection of mercury(II) ions in water at the 0.01 nM level are reported. The surface-modified gold sensor consists of a rarefied self-assembled monolayer of octanethiol topped with a Langmuir–Blodgett monolayer of an amphiphilic and highly-specific chelator. The interdigitated architecture confers to the bilayer a high packing density, surface coverage, and binding-group accessibility.

FIB-FESEM and EMPA results on Antoninianus silver coins for manufacturing and corrosion processes

2018

[EN] A set of ancient Antoninianus silver coins, dating back between 249 and 274¿A.D. and minted in Rome, Galliae, Orient and Ticinum, have been characterized. We use, for the first time, a combination of nano-invasive (focused ion beam-field emission scanning electron microscopy-X-ray microanalysis (FIB-FESEM-EDX), voltammetry of microparticles (VIMP)) and destructive techniques (scanning electron microscopy (SEM-EDX) and electron microprobe analysis (EMPA)) along with non-invasive, i.e., micro-Raman spectroscopy. The results revealed that, contrary to the extended belief, a complex Ag-Cu-Pb-Sn alloy was used. The use of alloys was common in the flourishing years of the Roman Empire. In th…

Artikulu lietojums projektu pārskatos

2019

Šī pētījuma mērķis ir izpētīt artikulu funkcijas projektu pārskatos. Pētījums atbild uz pētījuma jautājumu, kurš ir visbiežāk lietotais artikulu veids, kā arī ietver hipotēzi, norādot, ka visbiežāk lietotais artikulu veids ir noteiktais artikuls. Pētījuma metodes iekļauj diskursa analīzi ar kvalitatīvu un kvantitatīvu perspektīvu. Rezultāti atklāja, ka visbiežāk lietotais artikulu veids projektu pārskatos ir nulles artikuls. Turklāt, galvenā katra artikula funkcija ir sekojoša: noteiktais artikuls ir lietots, kad ir zināms konteksts, nenoteiktais – kad jauna ideja tiek piepazīstināta un nulles artikuls ir lietots ar lietvārdu daudzskaitļa formā. Kopumā, artikuli ir nozīmīga angļu valodas vā…

Näköpalautteeseen perustuvan harjoittelun vaikutus ikääntyneiden naisten tasapainoon : satunnaistettu, kontrolloitu interventiotutkimus

2005

Synergistic enhancement via plasmonic nanoplate-bacteria-nanorod supercrystals for highly efficient SERS sensing of food-borne bacteria

2017

Bio-sensing techniques utilizing metallic nanoparticles as a probe have gained more and more attention and play today an important role in the detection of bacteria. To date, although several sensing materials have been tested, there is still a long way to go to achieve a fast, low-cost, ultrasensitive and multifunctional substrate suitable for a universal biosensor for detection of bacterial cells. Here, we report a novel probe design based on anisotropic plasmonic nanoparticles organized to a biocompatible 3D bio-inorganic scaffold, i.e., nanoplate-bacteria-nanorod supercrystals (NBNS) with extremely high surface-enhanced Raman spectroscopic (SERS) activity as a model of synergistic plasm…

Asymmetric Synthesis of Chiral Bimetallic [Ag28Cu12(SR)24]4– Nanoclusters via Ion Pairing

2016

In this work, a facile ion-pairing strategy for asymmetric synthesis of optically active negatively charged chiral metal nanoparticles using chiral ammonium cations is demonstrated. A new thiolated chiral three-concentric-shell cluster, [Ag28Cu12(SR)24]4–, was first synthesized as a racemic mixture and characterized by single-crystal X-ray structure determination. Mass spectrometric measurements revealed relatively strong ion-pairing interactions between the anionic nanocluster and ammonium cations. Inspired by this observation, the as-prepared racemic mixture was separated into enantiomers by employing chiral quaternary ammonium salts as chiral resolution agents. Subsequently, direct asymm…

Soda samērīgums ar noziedzīgu nodarījumu Krimināllikuma 47. panta izpratnē

2015

Krimināllikuma 47. pantā ir noteikti atbildību mīkstinošie apstākļi, kuri tiek ņemti vērā soda noteikšanā. Konstatējot šos apstākļus, iespējams noteikt maigāku sodu Krimināllikuma Sevišķās daļas panta ietvaros, kā arī vainīgajai personai piemērot Krimināllikuma 49. un 55. pantu. Tiesām, sastādot nolēmumus, un prokuroram, sastādot priekšrakstu par sodu, ir rūpīgi jāizvērtē konstatēto atbildību mīkstinošo apstākļu daba un atbilstība likumdevēja gribai. Šobrīd spēkā esošais atbildību mīkstinošo apstākļu regulējums ir nepilnīgs un rada biežas, un nepamatotas interpretācijas iespējas, kas noved pie nesamērīga un netaisnīga soda mēra noteikšanas. Darba mērķis ir izpētīt Krimināllikuma 47. panta p…

Atbildību mīkstinošo un pastiprinošo apstākļu ietekme uz soda noteikšanu

2019

Maģistra darbs “Atbildību mīkstinošo un pastiprinošo apstākļu ietekme uz soda noteikšanu” saistīts ar soda noteikšanas vispārīgiem nosacījumiem, vēsturiskās attīstības tendencēm un gaitu, kā arī tiesu prakses izpēti saistībā ar atbildību mīkstinošo un pastiprinošo apstākļu konstatēšanu un interpretāciju soda noteikšanā. Darba mērķis ir apstiprināt mīkstinošo un pastiprinošo apstākļu nozīmīgumu soda noteikšanā, kā arī nepieciešamību pamatot to pielietošanas nosacījumus. Maģistra darba neatņemama sastāvdaļa ir arī soda noteikšanas vispārīgie principi, jo tie cieši saistīti ar taisnīguma būtību, iekļaujot atbildību mīkstinošo un pastiprinošo apstākļu institūtu. Pareiza soda noteikšana nav iesp…

Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

2021

Due to the high industrial interest for perovskite-based photovoltaic devices, there is an urgent need to fabricate them under ambient atmosphere, not limited to low relative humidity (RH) conditions. The formamidinium lead iodide (FAPI) perovskite α-black phase is not stable at room temperature and is challenging to stabilize in an ambient environment. In this work, we show that pure FAPI perovskite solar cells (PSCs) have a dramatic increase of device long-term stability when prepared under ambient air compared to FAPI PSCs made under nitrogen, both fabricated with N-methylpyrrolidone (NMP). The T80 parameter, the time in which the efficiency drops to 80% of the initial value, increases f…

An Atom-Economical Approach to Functionalized Single-Walled Carbon Nanotubes: Reaction with Disulfides

2013

Owing to their unique structure, thermal stability, and mechanical and electronic properties, single-walled carbon nanotubes (SWCNTs) have been a subject of continuous and intense interest. However, various applications in many fields, such as molecular electronics, solar cells, and nanomedicine, often require the development of reproducible protocols for the chemical modification of SWCNTs. In fact, one of the main drawbacks of the use of SWCNTs is their tendency to aggregate and intrinsic poor solubility, which prevent their manipulation and limit their potential. To date, several methods have been described for the chemical functionalization of SWCNTs; however, new versatile and reliable…