Search results for "C.M.M."
showing 10 items of 1066 documents
Relating magnetization, structure and rheology in ferrofluids with multi-core magnetic nanoparticles
2020
Abstract Due to their magnetic moments solubilized magnetic nanoparticles are able to spontaneously assemble into dipolar mesostructures, which affect the flow behavior. Multi-core magnetic nanoparticles developed for biomedical applications have enhanced magnetic properties and show significant magnetoviscous effect, but the quantitative interpretation of this phenomenon is incomplete. We apply rheological measurements, magnetic granulometry and dimensional scaling to show the existence of a master curve for magnetorheology of these materials. Using the developed approach the magnetoviscous effect can now be interpreted in a unified way within the stochastic chain model.
High field magnetization of the colloidal Mn–Zn ferrite
1999
Abstract The magnetic properties of a hydrocarbon based colloid (stabilized by oleic acid) of polydisperse chemically co-precipitated Mn 0.5 Zn 0.5 Fe 2 O 4 particles are discussed in the paper. Two fractions are separated from an initial ferrofluid sample by centrifugation. X-ray diffraction measurements show the crystal structure of the particles and a broadened shape of the diffraction lines. Mean particle diameters 6.2 nm (the light fraction) and 9.7 nm (the heavy one) were determined by TEM measurements. The magnetization of the colloids is measured by VSM up to 12 T. A significant slope in the magnetization curves in the high field region is displayed for both samples in the temperatu…
Evaluation of vapor mass transfer in various membrane distillation configurations: an experimental study
2011
Vapor mass transfer phenomena in four different membrane distillation (MD) configurations were examined through a self-built laboratory scale experimen- tal apparatus: Air Gap MD, Sweeping Gas MD, Vacuum Sweeping Gas MD and Vacuum MD. Vapor fluxes were measured and compared with those predicted by various models, showing that MD performance under usual processing conditions is severely controlled by the permeate side resistance to mass transfer.
Eight-Membered Rings With Two Heteroatoms 1,5
2022
This chapter titled “Eight-membered Rings with two Heteroatoms 1,5” deals eight-membered rings with two heteroatoms in a 1,5-relationship, namely 1,5-diazocine, 1,5-oxazocine, 1,5-thiazocine, 1,5-dioxocin, 1,5-oxathiocin, and 1,5-dithiocin and covers the literature from 2007 to October 2020 (SciFindern search) reporting the chemistry of uncondensed derivatives, diheterocines fused to carbocycles and heterocycles, as well as bridged diheterocines. Among them, the 1,5-diazocine ring system is by far the largest class, based on the number of publications which constituted the 87% of the total amount of the references reported in the range of interest of CHEC IV. Thus, 1,5-diazocines were divid…
ESTUDIO SOBRE EL LENGUAJE Y LAS FUNCIONES EJECUTIVAS DE UN CASO DE SÍNDROME DE X-FRÁGIL
2014
Abstract:STUDY ON LANGUAGE AND EXECUTIVE FUNCTIONS OF A CASE OF FRAGILE X SYNDROMEThe main objective of this study is to compare a subject with a clinical diagnosis of Fragile X Syndrome with other disorders (ADHD, Mental Retardation and ASD) in executive functioning and language. The language variables analyzed are lexical knowledge, lexical access, free induced verbal fluency, comprehension instruction and verbal reasoning. On the other hand, the executive functioning variables evaluated are visual and auditory memory, visual and auditory attention, and visual and auditory planning and inhibition. After evaluation, it is checked that Fragile X Syndrome resembles to Mental Retardation and …
Time-resolved buildup of twisted indirect exchange interaction in two-dimensional systems
2019
We study theoretically the time-domain dynamics of the spin-dependent Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between driven magnetic impurities localized in a spin-orbit-coupled two-dimensional system. Particular attention is given to the influence of the spin-orbit coupling (SOC) on the system's dynamical response to a time-dependent precessional motion of the localized magnetic moment. We show that, via the RKKY mechanism, a flip of the spin $z$ component of one localized moment affects all $x,\phantom{\rule{4pt}{0ex}}y$, and $z$ spin components of the other localized moment. The Friedel oscillations and the transient spin current triggered by the time-varying localized spin dep…
Episodic memories: how do the hippocampus and the entorhinal ring attractors cooperate to create them?
2020
AbstractThe brain is capable of registering a constellation of events, encountered only once, as an episodic memory that can last for a lifetime. As evidenced by the clinical case of the patient HM, memories preserving their episodic nature still depend on the hippocampal formation, several years after being created, while semantic memories are thought to reside in neocortical areas. The neurobiological substrate of one-time learning and life-long storing in the brain, that must exist at the cellular and circuit level, is still undiscovered. The breakthrough is delayed by the fact that studies jointly investigating the rodent hippocampus and entorhinal cortex are mostly targeted at understa…
Natural co-occurrence of mycotoxins in wheat grains from Italy and Syria
2014
This article describes the application of an analytical method for the detection of 25 mycotoxins in wheat grain based on simultaneous extraction using matrix solid-phase dispersion (MSPD) followed by liquid chromatography coupled to tandem mass spectrometry, a hybrid triple quadrupole-linear ion trap mass spectrometer (QTrapÒ). Information Dependent Acquisition (IDA), an extra confirmation tool for samples that contain the target mycotoxins, was used. The analysis of 40 Syrian and 46 Italian wheat grain sam- ples interestingly showed that Syrian samples were mainly contaminated with ochratoxin A and aflatox- ins, whereas Italian samples with deoxynivalenol and 15-acetyldeoxynivalenol. Emer…
Mycobiota and co-occurrence of mycotoxins in Capsicum powder
2011
This study aimed to: (1) determine the mycobiota of Capsicum powder samples, paying a special attention to the mycotoxigenic moulds; (2) evaluate the contamination levels of aflatoxins (AF), ochratoxin A (OTA), zearalenone (ZEA), deoxynivalenol (DON), T2 and HT2 toxins in those samples. Thirty-two samples were obtained through the methods of sampling established by the European Union legislation. Aspergillus and Eurotium were the most frequently found genera. Aspergillus section Nigri had the higher relative frequency in the samples, A. niger aggregate being the most representative group of this section. Other potentially mycotoxigenic Aspergillus, Fusarium and Penicillium species were foun…
Fusarium species, chemotype characterisation and trichothecene contamination of durum and soft wheat in an area of central Italy
2015
BACKGROUND Fusarium head blight (FHB) of wheat is an important disease causing yield losses and mycotoxin contamination. The aim of the work was to detect and characterise trichothecene producing Fusarium species in durum and soft wheat cultivated in an area of central Italy in 2009 and 2010 and to determine trichothecene contamination by LC-MS/MS in the grain. RESULTS F. graminearum s. str. was the most frequent species. In 2009, the occurrence of F. avenaceum and F. poae was higher than in 2010. Among F. graminearum strains, the 15-acetyl deoxynivalenol (15-ADON) chemotype could be found more frequently, followed by nivalenol (NIV) and 3-ADON chemotypes, while all F. culmorum isolates bel…