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Localization Length Exponent in Quantum Percolation
Chang ,Iksoo,Lev, Zvi,Harris, A.B.,Adler, Joan,Aharony, Amnon 부산대학교 기초과학연구소 1995 부산대학교 기초과학연구소 연구논문집 Vol.15 No.-
Connecting perfect one-dimensional leads to sites i and j on the quantum percolation (QP) model, we calculate the transmission coefficient T_(ij)(E) atan energy E near the band center and the averages of ∑_(ij)T_(ij),∑_(ij)r²_(ij)T_(ij), and ∑_(ij)r⁴_(ij)T_(ij) to tenth order in the concentration p. In three dimensions, all three seried diverge at P_(q)=0.36^(+0.01)_(-0.02), with exponents τ=0.82^(+0.10)_(-0.15), τ+2ν. and τ+4ν. We find ν=0.38 ±0.07, differing from "usual" Anderson localization and violationg the bound ν ≥ 2/d of Chayer et al. [Phys. Rev. Lett. 57, 2999(1986)]. Thus, QP belongs to a new universality class.
Rony Cohena,Ayelet Halevy,Sharon Aharoni,Avinoam Shuper 대한신경과학회 2018 Journal of Clinical Neurology Vol.14 No.2
Background and Purpose The objective of this study was to determine if the MOXO visualandvocal-distractors-based continuous performance test distinguishes patients with attentiondeficit hyperactivity disorder (ADHD) and neurofibromatosis type 1 (NF1) from those withoutNF1. Methods Thirty-five patients (16 males; mean age 9.91 years) attending a multidisciplinaryNF1 clinic completed the MOXO test. The findings were compared to 532 healthy age-matchedstandardized control subjects (285 males) without ADHD. Results The overall performance in the MOXO text was significantly worse in the NF1group than in controls (p<0.01), but no group-specific pattern was identified. Impulsivity andhyperactivity were significantly more prominent in males than females (p<0.01). Comparedto controls, the NF1 group exhibited significantly more failures to respond to target stimuli inthe presence of visual distractors. Conclusions MOXO scores are abnormal in patients with NF1, but the test cannot differentiatebetween NF1 with ADHD characteristics and ADHD. The test highlights sex differences inADHD characteristics in NF1. Overreactivity to visual distractors may form part of the attentiondeficit in NF1.
Thick Corpus Callosum in Children
Aviv Schupper,Osnat Konen,Ayelet Halevy,Rony Cohen,Sharon Aharoni,Avinoam Shuper 대한신경과학회 2017 Journal of Clinical Neurology Vol.13 No.2
Background and Purpose A thick corpus callosum (TCC) can be associated with a very grave outcome in fetuses, but its clinical presentation in older children seems to be markedly different. Methods The corpus callosum (CC) was defined as thick based on observations and impressions. We reviewed cases of children who were diagnosed as TCC based on brain magnetic resonance imaging (MRI) studies. The pertinent clinical data of these children were collected, and their CCs were measured. Results Out of 2,552 brain MRI images, those of 37 children were initially considered as showing a TCC. Those initial imaging were reviewed by an experienced neuroradiologist, who confirmed the diagnosis in 34 children (1.3%): 13 had neurofibromatosis-1 (NF-1), 9 had epilepsy, 3 had macrocephaly capillary malformation (MCM) syndrome, 3 had autistic spectrum disorder, 1 had a Chiari-1 malformation, and 1 had increased head circumference. No specific neurologic disorder could be defined in seven children. The measured thickness of the CC in these children was comparable to those published in the literature for adults. Conclusions A TCC is a rare brain malformation that can be found in neuropathologies with apparently diverse pathognomonic mechanisms, such as NF-1 and MCM. It is not necessarily associated with life-threatening conditions, instead being a relatively benign finding, different in nature from that reported in fetuses.