Search results for "HP"
showing 10 items of 1505 documents
A handy and accessible tool for identification of Sn(II) in toothpaste.
2021
AbstractAn easily accessible colorimetric probe, a carbazole–naphthaldehyde conjugate (CNP), was successfully prepared for the selective and sensitive recognition of Sn(II) in different commercially-available toothpaste and mouth wash samples. The binding mechanism of CNP for Sn2+ was confirmed by UV–Vis, 1H, and 13C NMR titrations. The proposed sensing mechanism was supported by quantum chemical calculations. Selective detection of Sn(II) in the nanomolar range (85 nM), among other interfering metal ions, makes it exclusive. Moreover, Sn2+ can be detected with a simple paper strip from toothpaste, which makes this method handy and easily accessible. The potential application of this system…
IDENTIFICATION AND QUANTIFICATION OF PHENOLIC COMPOUNDS FROM RED GRAPE POMACE
2018
The wine industry generates a great amount of waste every year, thus its valorization is of most importance. This study uses red, fermented pomace from Cabernet Sauvignon and Feteasca Neagra cultivars. The phenolic compounds were extracted using four different extractions and the content of total polyphenols was determined using a spectrophotometrical method. Several phenolic compounds were analyzed using an HPLC method. The Cabernet Sauvignon pomace had the highest content of total polyphenols and total phenolic compounds analyzed and of quercetin, rutin, ferulic acid and resveratrol, while the Feteasca Neagra pomace had the highest content of gallic acid, syringic acid, cinamic acid and (…
On the effects of transmit power control on the energy consumption of WiFi network cards
2009
Transmit power control has been largely proposed as a solution to improve the performance of packet radio systems in terms of increased throughput, spatial reuse and battery lifetime for mobile terminals. However, the benefits of transmit power control schemes on these different performance figures may strongly depend on the employed PHY technology and channel access mechanism. In this paper, we focus on the effects of power control on the energy consumption of WiFi network cards. By means of several experimental tests carried out under different operation conditions and modulation schemes, we try to justify why the reduction of the transmission power has a marginal effect on the overall en…
The prolyl-isomerase PIN1 is essential for nuclear Lamin-B structure and function and protects heterochromatin under mechanical stress.
2021
Summary: Chromatin organization plays a crucial role in tissue homeostasis. Heterochromatin relaxation and consequent unscheduled mobilization of transposable elements (TEs) are emerging as key contributors of aging and aging-related pathologies, including Alzheimer’s disease (AD) and cancer. However, the mechanisms governing heterochromatin maintenance or its relaxation in pathological conditions remain poorly understood. Here we show that PIN1, the only phosphorylation-specific cis/trans prolyl isomerase, whose loss is associated with premature aging and AD, is essential to preserve heterochromatin. We demonstrate that this PIN1 function is conserved from Drosophila to humans and prevents…
Recommendations of the LHC Dark Matter Working Group: Comparing LHC searches for dark matter mediators in visible and invisible decay channels and ca…
2019
Physics of the Dark Universe 26, 100377 (2019). doi:10.1016/j.dark.2019.100377
Tīmekļa lietotne sadzīves pakalpojumu pietekšanai
2018
Tīmekļa lietotne sadzīves pakalpojumu pieteikšanai (turpmāk - sistēma “E-meistars”) ir paredzēta sadzīves pakalpojumu sniegšanai un saņemšanai. Sistēmā paredzētas 2 galvenās lietotāju grupas - pakalpojumu sniedzēji (meistari) un saņēmēji (klienti). Klienti var pieteikt radušos problēmu kādā no piedāvātajām sadzīves pakalpojumu kategorijām un meistari pieteikties problēmas novēršanai. Klients tad var brīvi izvēlēties meistaru, kuru algos problēmas novēršanai. Šis dokuments satur sistēmas “E-meistars” programmatūras prasību specifikāciju (PPS), kurā aprakstītas sistēmas prasības, kā arī programmatūras projektējuma aprakstu (PPA), kurā ir noteikta sistēmas realizācija. Dokumentā atrodams arī p…
Projektu pārvaldības aplikācija
2017
Projektu pārvaldības sistēma ir tīmekļa vietne, kas domāta darba grupām un arī nelieliem uzņēmumiem veidot un pārvaldīt kopīgus projektus, lietotājiem atvieglojot projektu kontroli un plānošanu. Lietotne ļauj veikt uzskaiti par projektu uzdevumiem atbilstoši ievadītajiem datiem un veidot uzdevumus, norādīt projekta statusu, pievienot komentārus un failus kā arī katram lietotājam izveidot savas individuālās piezīmes. Sistēma izstrādāta ar atvērtā pirmkoda rīkiem – Laravel PHP, jQuery, Bootstrap un citiem.
Mykoob konsultāciju grafika funkcionalitātes izstrāde
2015
“Mykoob” mācību sociālais tīkls ir elektroniska skolu pārvaldības sistēma. Sistēmai trūka konsultāciju grafika sadaļa, kuras izstrāde tiek aprakstīta šajā darbā. Šīs sistēmas sadaļas mērķis ir piedāvāt ērtāku veidu, kā skolas mācībspēkam sniegt informāciju skolēniem un viņu vecākiem par konsultāciju laikiem, vietām un tēmām. Autora izvirzītie uzdevumi ietver ar jaunas sistēmas sadaļas palīdzību atvieglot skolu mācībspēka darbu, palielināt izglītojamo interesi par papildus izglītošanos ārpus obligātajām nodarbībām kā arī palielināt vecāku līdzdalību izglītojamo skolas dzīvē. Projekts veidots pēc iteratīvā programmatūras izstrādes modeļa. Sistēmas klienta puses risinājumi izstrādāti izmantojo…
Applicability of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) bark extract as a precursor of rigid carbon foam and activated carbon
2023
Hybrid aspens have long attracted scientific interest, but the research on their use as feedstocks for chemical applications are still very limited. The bark biomass of the poplar species contains many valuable extractives that can be utilized as value-added products. This paper examines the applicability of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) bark extract as a precursor of rigid carbon foam and activated carbon. To explore this, the study considers 1) the basic chemical composition of the bark in terms of added value potential, 2) the basic chemical composition of the bark extract and the effect of its pretreatment on the extract composition, 3) the production of rigi…
Behaviour of Extractives in Norway Spruce (Picea abies) Bark during Pile Storage
2022
The current practices regarding the procurement chain of forest industry sidestreams, such as conifer bark, do not always lead to optimal conditions for preserving individual chemical compounds. This study investigates the standard way of storing bark in large piles in an open area. We mainly focus on the degradation of the most essential hydrophilic and hydrophobic extractives and carbohydrates. First, two large 450 m3 piles of bark from Norway spruce (Picea abies) were formed, one of which was covered with snow. The degradation of the bark extractives was monitored for 24 weeks. Samples were taken from the middle, side and top of the pile. Each sample was extracted at 120 °C with both n-h…