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Thermal Conductivity of ZnO Single Nanowire
Yuldashev, Sh. U.,Yalishev, V. Sh.,Cho, H. D.,Kang, T. W. American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.2
<P>The thermal conductivity of a single ZnO nanowire with diameter of similar to 150 nm was measured using a four-point-probe 3 omega method over a temperature range of 140-300 K. The measured thermal conductivity of ZnO nanowire is strongly reduced compared to bulk ZnO crystal due to the enhanced phonon-boundary and impurity (isotope) scattering. The maximum of the thermal conductivity is shifted to a higher temperature than that of bulk counterpart. Temperature dependent measurements show that beyond the low-temperature maximum, the thermal conductivity decreases with temperature as T-1.5 indicating strong impurity (isotope) scattering at intermediate and high temperatures.</P>
Magnetoelectric effect in GaMnAs /P(VDF-TrFE) composite multiferroic nanostructures
Yuldashev, S.U.,Yalishev, V.Sh.,Yunusov, Z.A.,Lee, S.J.,Jeon, H.C.,Kwon, Y.H.,Lee, G.T.,Park, C.M.,Kang, T.W. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.suppl2
The electric-field effect on the Curie temperature of the ferromagnetic semiconductor GaMnAs and ferroelectric polyvinylidene fluoride with trifluoroethylene P(VDF-TrFE) multiferroic nanostructures have been investigated. The Curie temperatures of GaMnAs layers were determined from the temperature dependencies of the resistivity at zero magnetic field and the anomalous Hall effect measurements. Under the electric-field potential with different polarities applied to the ferroelectric gate the shift of the Curie temperature in GaMnAs has been observed. The shift of T<SUB>C</SUB> is due to the variation of the hole concentration in the ferromagnetic layer induced by the gate electric field.
Orthopedic Manifestations of Type I Camurati-Engelmann Disease
Yuldashev, Alisher J.,Shin, Chang Ho,Kim, Yong Sung,Jang, Woo Young,Park, Moon Seok,Chae, Jong Hee,Yoo, Won Joon,Choi, In Ho,Kim, Ok Hwa,Cho, Tae-Joon 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.1
<P><B>Background</B></P><P>Camurati-Engelmann disease (CED) is a rare genetic skeletal disorder characterized by limb pain, muscle emaciation and weakness, and cortical thickening of the diaphysis of long bones. It is caused by mutations in the transforming growth factor beta 1 (TGFB1) (type I) or other unknown gene(s) (type II). We present 8 consecutive patients with type I CED.</P><P><B>Methods</B></P><P>We retrospectively reviewed medical records and radiographs of type I CED patients with special reference to the mode of presentation, process of diagnostic work-up, and disease course. They were 4 sporadic patients, and two pairs of mother and son.</P><P><B>Results</B></P><P>We categorized the mode of presentation into three groups. Group I had 4 patients who mainly presented with motor disturbances in young age. They drew medical attention for waddling gait, awkward ambulation or running, difficulty in going upstairs, or a positive Gower's sign at age 4 to 6 years. Subsequent development of limb pain and radiographic abnormality led to the diagnosis of CED at age 6 to 29 years. Group II had 3 patients who mainly presented with limb pain at age 15, 20, and 54 years, respectively. Radiographic evaluation and molecular genetic test led to the diagnosis of CED. The remaining 1 patient (group III) was asymptomatic until age 9 years when bony lesions at the tibiae were found incidentally. For the last 10 years, he intermittently complained of leg pain in the morning or after sports activities, which did not interfere with daily life. All the patients in group I showed a body mass index in the underweight range (< 18.4 kg/m<SUP>2</SUP>). At the latest follow-up, 4 patients in groups I and II required medication for the limb pain.</P><P><B>Conclusions</B></P><P>CED presents with a wide range of severity. Awareness of this rare disease entity may be the key to timely correct diagnosis. This disease entity should be considered in the differential diagnosis of limb pain or motor disturbance in children to avoid unnecessary diagnostic work-up.</P>