نتایج جستجو برای: bifeo3 nmps

تعداد نتایج: 1323  

Journal: :Physical review letters 2008
H W Jang S H Baek D Ortiz C M Folkman R R Das Y H Chu P Shafer J X Zhang S Choudhury V Vaithyanathan Y B Chen D A Felker M D Biegalski M S Rzchowski X Q Pan D G Schlom L Q Chen R Ramesh C B Eom

Direct measurement of the remanent polarization of high quality (001)-oriented epitaxial BiFeO3 thin films shows a strong strain dependence, even larger than conventional (001)-oriented PbTiO3 films. Thermodynamic analysis reveals that a strain-induced polarization rotation mechanism is responsible for the large change in the out-of-plane polarization of (001) BiFeO3 with biaxial strain while t...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سمنان 1393

بیسموت فریت یکی از مهمترین ترکیبات مورد مطالعه در دهه ی اخیر است. در تحقیق حاضر، سنتز نانوذرات bifeo3، برای اولین بار به روش هیدروترمال آب فوق بحرانی بررسی شده است. بازده تولید نانوذرات bifeo3 به روش طراحی آزمایش باکس بنکن بهینه شد. تأثیر پارامترهای دما، زمان و ph بر بازده ارزیابی گردید. نتایج نشان می دهند که نانوذرات bifeo3 با اندازه ی متوسط nm 80-30 به روش هیدروترمال فوق بحرانی با موفقیت سنتز...

Journal: :Development 2017
Hana Goto Samuel C Kimmey Richard H Row David Q Matus Benjamin L Martin

Mesoderm induction begins during gastrulation. Recent evidence from several vertebrate species indicates that mesoderm induction continues after gastrulation in neuromesodermal progenitors (NMPs) within the posteriormost embryonic structure, the tailbud. It is unclear to what extent the molecular mechanisms of mesoderm induction are conserved between gastrula and post-gastrula stages of develop...

2015
Yaming Jin Xiaomei Lu Junting Zhang Yi Kan Huifeng Bo Fengzhen Huang Tingting Xu Yingchao Du Shuyu Xiao Jinsong Zhu

For rhombohedral multiferroelectrics, non-180° ferroelectric domain switching may induce ferroelastic and/or (anti-)ferromagnetic effect. So the determination and control of ferroelectric domain switching angles is crucial for nonvolatile information storage and exchange-coupled magnetoelectric devices. We try to study the intrinsic characters of polarization switching in BiFeO3 by introducing ...

2006
Gregory Shakhnarovich Sung-Phil Kim Michael J. Black

Neural motor prostheses (NMPs) require the accurate decoding of motor cortical population activity for the control of an artificial motor system. Previous work on cortical decoding for NMPs has focused on the recovery of hand kinematics. Human NMPs however may require the control of computer cursors or robotic devices with very different physical and dynamical properties. Here we show that the ...

2012
Antonio Perejón Nahum Masó Anthony R. West Pedro E. Sánchez-Jiménez Rosalía Poyato José M. Criado Luis A. Pérez-Maqueda

Phase-pure powders of stoichiometric BiFeO3 have been prepared by mechanosynthesis. Ceramics sintered by either conventional heating in air or spark plasma sintering (SPS) followed by oxidative anneal in air are highly insulating with conductivity e.g. ~10 Scm at 300 °C and activation energy 1.15(2) eV, which are comparable to those of a good-quality BiFeO3 single crystal. By contrast, the as-p...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده شیمی 1391

در کار پژوهشی حاضر نانو پروسکیت bifeo3 و گونه های دوپه شده آن با برخی عناصر لانتانیدی و واسطه به روش «سُل – ژل » سنتز گردید سپس ساختار و خواص آنها با بهره گیری از xrd، ft-ir، uv-vis ، edx ، sem ، map analysis ، vsm ،bet و gc مورد مطالعه وبررسی قرار گرفت. نتایج آنالیز xrd نشان داد که در سیستم های دوپه شده تا 14% مولی از عناصر دوپه شونده x=0/14))، نمونه ها بصورت پروسکیت تک فاز می باشند، از آنالیز ...

Journal: :Chemical communications 2013
Shun Li Jianming Zhang Md Golam Kibria Zetian Mi Mohamed Chaker Dongling Ma Riad Nechache Federico Rosei

Hybrid photocatalysts consisting of single crystalline BiFeO3 nanowires and laser ablated Au nanoparticles were synthesized by a functionalization-step-free solution process. The 1.0 wt% Au nanoparticle decorated BiFeO3 nanowires exhibit ~30 times higher photocatalytic activity for water oxidation than that exhibited by the parent wires during the first 4 h.

Herein, it has been shown that the bismuth ferrite magnetic nanoparticles (BFO-MNPs) are new, efficient and recyclable catalysts for the synthesis of polyhydroquinoline derivatives by the Hantzsch reaction. The one-pot four-component cyclocondensation reaction of dimedone, aromatic aldehydes, ethyl acetoacetate and ammonium acetate was carried out under solvent-free conditions. The...

Journal: :Blood 1997
J L Vaerman P Moureau F Deldime P Lewalle C Lammineur F Morschhauser P Martiat

Antisense oligodeoxyribonucleotides (ODNs) are now being extensively investigated in an attempt to achieve cell growth suppression through specific targeting of genes related to cell proliferation, despite increasing evidence of non-antisense cytotoxic effects. In the context of anti-BCR/ABL antisense strategies in chronic myeloid leukemia, we have reexamined the antiproliferative effect of pho...

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