Search results for "-n"
showing 10 items of 5782 documents
Immunohistochemical evaluation of metallothionein in palatal mucosal cells of mice treated with 4NQO
2006
Objective: Metallothionein (MT) may play a preventive role in various carcinogenic process. 4NQO is an alkaline compound and potent mutagen that causes the formation of DNA adducts. The purpose of this study was to evaluate the immunoexpression of MT in palatal cells of mice submitted to the carcinogen 4NQO. Study design: C57BL/6 mice received applications of 4NQO to palate for periods of 8, 16, 20 and 24 weeks (experimental group). A control group received only applications of propylene glycol for the same periods. Subsequently animals of experimental and control groups were sacrificed and the palate was histologically analysed and MT immunohistochemistry performed. Results: Although morph…
Pseudospectrum of Reissner-Nordström black holes: Quasinormal mode instability and universality
2021
Black hole spectroscopy is a powerful tool to probe the Kerr nature of astrophysical compact objects and their environment. The observation of multiple ringdown modes in gravitational waveforms could soon lead to high-precision gravitational spectroscopy, so it is critical to understand if the quasinormal mode spectrum is stable against perturbations. It was recently shown that the pseudospectrum can shed light on the spectral stability of black hole quasinormal modes. We study the pseudospectrum of Reissner-Nordstr\"om spacetimes and we find a spectral instability of scalar and gravitoelectric quasinormal modes in subextremal and extremal black holes, extending similar findings for the Sch…
An equation to calculate the availability for the k-out-of-n system
2016
Reliability and availability (R&A) analyses are primary phases in management of complex systems and play a fundamental role in products and services quality. Management of maintenance activities has to be based on optimisation to simultaneously improve the operative conditions of the system. Maintenance optimization can be effeectively pursued by the RCM (Reliability-centered maintenance) approach. The authors demonstrate the global improvement of R&A by applying the RCM to the results derived by the FMECA (Failure Modes Effects and Criticality Analysis). Many efforts have been made to improve traditional methodologies of analysis, mainly tending to reduce the imprecision on data related to…
Titanocene Selenide Sulfides Revisited: Formation, Stabilities, and NMR Spectroscopic Properties
2019
[TiCp2S5] (phase A), [TiCp2Se5] (phase F), and five solid solutions of mixed titanocene selenide sulfides [TiCp2SexS5−x] (Cp = C5H5−) with the initial Se:S ranging from 1:4 to 4:1 (phases B–E) were prepared by reduction of elemental sulfur or selenium or their mixtures by lithium triethylhydridoborate in thf followed by the treatment with titanocene dichloride [TiCp2Cl2]. Their 77Se and 13C NMR spectra were recorded from the CS2 solution. The definite assignment of the 77Se NMR spectra was based on the PBE0/def2-TZVPP calculations of the 77Se chemical shifts and is supported by 13C NMR spectra of the samples. The following complexes in varying ratios were identified in the CS2 solutions of …
Proximity Effect in Superconducting Heterostructures with Strong Spin-Orbit Coupling and Spin Splitting
2019
It has been shown that singlet Cooper pairs can be converted into triplet ones and diffuse into a ferromagnet over a long distance in a phenomenon known as the long-range proximity effect (LRPE). This happens in materials with inhomogeneous magnetism or spin-orbit coupling (SOC). Most of the previous studies focus on the cases with small SOC and exchange field. However, the physics was not clear when SOC and exchange field strength are both much greater than the disorder strength. In this work, we consider a two dimensional system with a large Rashba-type SOC and exchange field in the case where only one band is partially occupied. We develop a generalized quasiclassical theory by projectin…
Limits to CO2-Neutrality of Burning Wood. (Review)
2016
Abstract Consumption of wood as a source of energy is discussed with respect to efficiency and restraints to ensure sustainability of the environment on the grounds of a simple analytical model describing dynamics of biomass accumulation in forest stands – a particular case of the well-known empirical Richards’ equation. Amounts of wood harvested under conditions of maximum productivity of forest land are presented in units normalised with respect to the maximum of the mean annual increment and used to determine the limits of CO2-neutrality. The ecological “footprint” defined by the area of growing stands necessary to absorb the excess amount of CO2 annually released from burning biomass is…
Sakārtotie svārstīgie nestriktie Hamahera agregācijas operatori daudzkritēriju lēmumu pieņemšanā
2017
Bakalaura darba ir veltīts sakārtotie svārstīie nestriktie Hamahera agregācijas operatoru un to pielietojums daudzkritēriju lēmumu pieņemšanā. Darbā aprakstīti tādi jēdzieni, kā t-norma, t-konorma, involūcija, svārstīga nestrikta kopa, svārstīgu nestriktu elementu sakārtojums, kuri nepieciešami, lai definētu sakārtotu svārstīgo nestrikto agregācijas operatoru. Balstoties uz šiem operātoriem aprakstīts daudzkritēriju lēmumu pieņemšanas modelis, kas ilustrēts ar praktiskiem piemēriem.
Drugie stanowisko prześwietlika platanowego Corythucha ciliata (Say, 1832) (Hemiptera: Heteroptera: Tingidae) na Górnym Śląsku
2022
The sycamore lace bug Corythucha ciliata (Say, 1832) has a North American origin and is one of the most abundant and widespread pests on plane trees (Platanus spp.) across the globe. It has been introduced to Europe, South America, Asia, Australia, and Africa during the last sixty years. In Poland, it has been recorded since 2009 in 28 localities distributed in four of its southern zoogeographical regions. The present paper describes the second record of this species in Upper Silesia.
CCDC 846271: Experimental Crystal Structure Determination
2012
Related Article: G.Callebaut, S.Mangelinckx, L.Kiss, R.Sillanpaa, F.Fulop, N.De Kimpe|2012|Org.Biomol.Chem.|10|2326|doi:10.1039/c2ob06637h
Sähköisten kirjojen hylkäämisen syyt
2016
Sähköinen kirja ei ole yleistynyt odotetulla tavalla. Tutkimuksen tavoitteena oli selvittää, millaisia syitä potentiaaliset käyttäjät kertovat sille, etteivät käytä sähköistä kirjaa vapaa-ajan lukuharrastuksessa. Tutkimuksen aineistona oli kahdeksan haastattelua, jotka toteutettiin teemahaastatteluna. Haastateltavat valittiin sillä perusteella, että he eivät olleet käyttäneet sähköistä kirjaa tai olivat keskeyttäneet niiden käytön. Aineistoa analysoitiin teemoittelun ja laskemisen avulla. Lisäksi tarkasteltiin, missä vaiheessa innovaation omaksumisprosessia sähköinen kirja hylättiin ja mitkä tekijät voisivat vaikuttaa niiden myöhempään omaksumiseen. Tutkimuksen mukaan yleisin sähköisen kirj…