Search results for "articles"
showing 10 items of 9626 documents
High-Precision Q-Value Measurement Confirms the Potential of 135Cs for Absolute Antineutrino Mass Scale Determination
2020
The ground-state-to-ground-state β-decay Q value of Cs135(7/2+)→Ba135(3/2+) has been directly measured for the first time. The measurement was done utilizing both the phase-imaging ion-cyclotron resonance technique and the time-of-flight ion-cyclotron resonance technique at the JYFLTRAP Penning-trap setup and yielded a mass difference of 268.66(30) keV between Cs135(7/2+) and Ba135(3/2+). With this very small uncertainty, this measurement is a factor of 3 more precise than the currently adopted Q value in the Atomic Mass Evaluation 2016. The measurement confirms that the first-forbidden unique β--decay transition Cs135(7/2+)→Ba135(11/2-) is a candidate for antineutrino mass measurements wit…
Study of Long-Lived particles beyond the Standard Model at LHCb
2022
Long-lived particles are predicted in many extensions of the Standard Model but the experimental detection is very challenging because they decay out of the first trackers and usually scape to the trigger decisions. In this work we review several new physics models and summarize the experimental status concerning the related searches. We revise the capabilities of the high level trigger system of the LHCb experiment and evaluate the effect of the trigger to detect long-lived particles for two models: a previous work where Dark Higgs Model is assumed, and another one studied for first time in this work, the Composite Higgs involving light scalars signatures. A Montecarlo study about the deca…
The modelling of the behaviour of solid inclusions in the EM induced recirculated turbulent flows of liquid metal
2014
Promocijas darbā skaitliski un eksperimentāli pētītas noslēgtas elektromagnētiski ierosinātas šķidrā metāla turbulentās plūsmas ar cietām daļiņām. Šādas plūsmas veidojas metalurģiskajās indukcijas krāsnīs. Darbā ir izveidots uz LES plūsmas aprēķina pieejas bāzēts Lagranža modelis ar paplašinātu spēku kopu inerciālo daļiņu pārneses aprakstam. Veikts eksperimentāls daļiņu koncentrācijas pētījums kvazi-stacionārā stāvoklī, izmantojot jaunu ideju: ferromagnētiskās daļiņas izmantotas kā nevadošu daļiņu fiziskais modelis šķidrajā metālā - tas ir pirmais zināmais eksperimentālais darbs cietu ieslēgumu sadalījuma analīzē elektormagnētiski ierosinātu šķidro metālu plūsmu iekšienē. Eksperiments pierā…
Neutron Radiography Visualization of Solid Particles in Stirring Liquid Metal
2015
Abstract This paper presents the analysis of the first dynamic neutron radiography experiment that visualized motion of solid particles in liquid metal, which was stirred by a system of four counter-rotating magnets. The paper also contains the quantitative results derived from neutron images: the distribution of particle concentration, number of admixed particles and velocities as functions of the magnet rotation speed.
Fight evolution with evolution: plasmid‐dependent phages with a wide host range prevent the spread of antibiotic resistance
2013
The emergence of pathogenic bacteria resistant to multiple antibiotics is a serious worldwide public health concern. Whenever antibiotics are applied, the genes encoding for antibiotic resistance are selected for within bacterial populations. This has led to the prevalence of conjugative plasmids that carry resistance genes and can transfer themselves between diverse bacterial groups. In this study, we investigated whether it is feasible to attempt to prevent the spread of antibiotic resistances with a lytic bacteriophage, which can replicate in a wide range of gram‐negative bacteria harbouring conjugative drug resistance–conferring plasmids. The counter‐selection against the plasmid was sh…
Unraveling the nature of universal dynamics in O(N) theories
2020
Many-body quantum systems far from equilibrium can exhibit universal scaling dynamics which defy standard classification schemes. Here, we disentangle the dominant excitations in the universal dynamics of highly occupied N-component scalar systems using unequal-time correlators. While previous equal-time studies have conjectured the infrared properties to be universal for all N, we clearly identify for the first time two fundamentally different phenomena relevant at different N. We find all N >= 3 to be indeed dominated by the same Lorentzian "large-N" peak, whereas N = 1 is characterized instead by a non-Lorentzian peak with different properties, and for N = 2, we see a mixture of two cont…
Study of scintillation light collection, production and propagation in a 4 tonne dual-phase LArTPC
2020
The $3 \times 1 \times 1$ m$^3$ demonstrator is a dual phase liquid argon time projection chamber that has recorded cosmic rays events in 2017 at CERN. The light signal in these detectors is crucial to provide precise timing capabilities. The performances of the photon detection system, composed of five PMTs, are discussed. The collected scintillation and electroluminescence light created by passing particles has been studied in various detector conditions. In particular, the scintillation light production and propagation processes have been analyzed and compared to simulations, improving the understanding of some liquid argon properties.
Folate-targeted gold nanorods for effective combined photothermal-chemotherapy of osteosarcoma
2016
Osteosarcoma (OS) is the most common primary malignant neoplasm of bone. The annual incidence of osteosarcoma is 8-11 per million in the age group of 15-19 years. Despite its rarity, it has been reported to be the second leading cause of cancer-related deaths in children and young adults. In particular with regard to OS therapy, a variety of nanostructures have been exploited in the areas of OS imaging. Among them, Gold nanorods (AuNRs) have unique optical and chemical-physical properties that make them appealing for biomedical applications such as photothermal therapy, drug delivery and imaging of solid tumors. The noble metal core is biologically inert, contributing to low toxicity and go…
NIR LASER-RESPONSIVE FOLATE-TARGETED GOLD NANORODS AS EFFICIENT THERANOSTIC TOOL FOR OSTEOSARCOMA TREATMENT
2017
Folate-targeted gold nanorods (GNRs) are here proposed as selective theranostic agents for osteosarcoma treatment. Taking advantage of the attractive physiochemical and optical properties of GNRs they can be proposed as effective and selective platform to obtain a targeted intracellular drug release, photothermal therapy and cancer imaging, which may improve therapeutic outcomes of osteosarcoma. An amphiphilic polysaccharide graft-copolymer, named INU-LA-PEG-FA, and a folic acid functionalized α,β-poly(N-2-hydroxyethyl)-D,L-aspartamide (PHEA-FA), have been synthesized to act as coating agents for GNRs. The obtained polymer-coated GNRs were characterized in terms of size, shape, zeta potenti…
Darbības vārdu savienojumi ar postpozīcijām veidi rakstos par jaunuzņēmumiem
2019
Ziņu portāli ir vieni no izplatītākajiem informācijas avotiem, kuri informē par jaunākajām aktualitātēm pasaulē. Attiecīgi, ir ļoti svarīgi apzināt valodas lietojumu un tās atspoguļojumu ziņu rakstos. Tādēļ šī pētījuma mērķis ir pētīt valodas lietojumu rakstos par jaunuzņēmumiem, precīzāk, darbības vārdus ar postpozīcijām un to semantiskās un sintaktiskās īpašības. Lai sasniegtu mērķi, pētījums balstās uz 30 ziņu rakstiem par jaunuzņēmumiem, pēta 220 darbības vārdus ar pospozīcijām un to pielietojumu. Teorētiskā literatūra atklāja ka darbības vārdi ar postpozīcijām ir komplicēti to pārnesto nozīmju un gramatisko īpašību dēļ. Pētījuma rezultāti atspoguļo visbiežāk izmantotos darbības vārdus …