scholarly journals Effects of Growth Conditions on One-dimensional Nanorod Growth in REBa2Cu3O7-δ Films

2009 ◽  
Vol 44 (12) ◽  
pp. 535-542 ◽  
Author(s):  
Hideki KAI ◽  
Shigeru HORII ◽  
Ataru ICHINOSE ◽  
Ryusuke KITA ◽  
Kaname MATSUMOTO ◽  
...  
Keyword(s):  
Growth Conditions ◽  
One Dimensional ◽  
Nanorod Growth

Formation of Cr-rich Nano-clusters and Columns in (Zn,Cr)Te Grown by MBE

2009 ◽  
Vol 1183 ◽  
Author(s):  
Yôtarõ Nishio ◽  
Kôichirô Ishikawa ◽  
Shinji Kuroda ◽  
Masanori Mitome ◽  
Yoshio Bando
Keyword(s):  
Magnetic Properties ◽  
Substrate Temperature ◽  
Crystallographic Orientation ◽  
Vertical Direction ◽  
Growth Conditions ◽  
Chemical Analyses ◽  
Mbe Growth ◽  
One Dimensional ◽  
X Ray ◽  
Cr Content

AbstractThe correlation between the Cr aggregation and magnetic properties are investigated for the series of Zn1-xCrxTe films grown by MBE with a systematic variation of growth conditions. Structural and chemical analyses using TEM and energy-dispersive X-ray spectroscopy (EDS) reveal that the crystallinity and the Cr distribution change significantly with the substrate temperature during the MBE growth. For a relatively low average Cr content x ≅ 0.05, it is found that the crystal quality is improved with the increase of the substrate temperature. For a higher average Cr content x ≅ 0.2, the shape of Cr-rich regions is transformed from isolated clusters into one-dimensional nanocolumns with the increase of the substrate temperature. The direction of the nanocolumn formation changes depending on the crystallographic orientation of the grown films. In the magnetization measurements, anisotropic magnetic properties are observed in the films in which Cr-rich nanocolumns are formed in the vertical direction, depending on the relation between the direction of the nanocolumns and the applied magnetic fields.

scholarly journals Fourier multipliers on spaces of distributions

1986 ◽  
Vol 29 (3) ◽  
pp. 309-327 ◽  
Author(s):  
W. Lamb
Keyword(s):  
Banach Spaces ◽  
Growth Conditions ◽  
Fourier Multipliers ◽  
Bounded Operators ◽  
Vertical Strip ◽  
One Dimensional ◽  
The One ◽  
Image Position ◽  
Complex Valued

In [8], Rooney defines a class of complex-valued functions ζ each of which is analytic in a vertical strip α(ζ)< Res < β(ζ) in the complex s-plane and satisfies certain growth conditions as |Im s| →∞ along fixed lines Re s = c lying within this strip. These conditions mean that the functionsfulfil the requirements of the one-dimensional Mihlin-Hörmander theorem (see [6, p. 417]) and so can be regarded as Fourier multipliers for the Banach spaces . Consequently, each function gives rise to a family of bounded operators W[ζ,σ] σ ∈(α(ζ),β(ζ)), on , 1<p<∞.

Controlled synthesis of quasi-one-dimensional boron nitride nanostructures

2007 ◽  
Vol 22 (10) ◽  
pp. 2809-2816 ◽  
Author(s):  
Dai-Ming Tang ◽  
Chang Liu ◽  
Hui-Ming Cheng
Keyword(s):  
Boron Nitride ◽  
Catalyst Concentration ◽  
Structural Characteristics ◽  
Chemical Vapor ◽  
Growth Conditions ◽  
Chemical Vapor Deposition Method ◽  
One Dimensional ◽  
Experimental Parameters ◽  
Bn Nanostructures ◽  
Catalyst Chemical Vapor Deposition

A floating catalyst chemical vapor deposition method was developed for the synthesis of quasi-one-dimensional (1D) boron nitride (BN) nanostructures. By carefully tuning the experimental parameters such as growth temperature, floating catalyst concentration, and boron precursor, high quality 1D BN nanostructures including nanotubes, nanobamboos, and nanowires were selectively produced. The microstructures of the obtained 1D BN nanomaterials were characterized, and it was found that the nanostructures are composed of hexagonal BN phase with (002) planes stacking in different manners. A growth mechanism of the BN nanostructures was proposed based on the analysis of their structural characteristics and growth conditions.

scholarly journals Relationship between surface structure and one-dimensional nanorod growth in ErBa2Cu307−δfilms on vicinal SrTi03substrates

2010 ◽  
Vol 234 (1) ◽  
pp. 012022 ◽  
Author(s):  
Hideki Kai ◽  
Ataru Ichinose ◽  
Shigeru Horii ◽  
Yutaka Yoshida ◽  
Ryusuke Kita ◽  
...  
Keyword(s):  
Surface Structure ◽  
One Dimensional ◽  
Nanorod Growth

A Phragmén–Lindelöf principle for the equation of a surface of constant mean curvature

1994 ◽  
Vol 124 (1) ◽  
pp. 105-119 ◽  
Author(s):  
R. J. Knops ◽  
L. E. Payne
Keyword(s):  
Mean Curvature ◽  
Constant Mean Curvature ◽  
Growth Conditions ◽  
Infinite Strip ◽  
Dimensional Problem ◽  
One Dimensional ◽  
First Order ◽  
Lindelöf Principle ◽  
Class Of Functions ◽  
Longitudinal Distance

This paper studies the surface of constant mean curvature on a semi-infinite strip, and shows by means of a first-order differential inequality that the solution in a given measure either becomes asymptotically unbounded at least to polynomial order, or decays at most exponentially to the solution of an associated one-dimensional problem. A proof is also presented for uniqueness in the class of functions having bounded gradient and subject to specified growth conditions for large values of the longitudinal distance. Extensions of these results to the whole strip and to more general types of equations are also described.

Preparation of Porous Alumina Template for Nanostructure Fabrication

2014 ◽  
Vol 895 ◽  
pp. 21-24
Author(s):  
Kuan Ying Kok ◽  
Inn Khuan Ng ◽  
Nur Ubaidah Saidin ◽  
Suhaila Hani Illias
Keyword(s):  
Porous Alumina ◽  
Formation Rate ◽  
Growth Conditions ◽  
Nanostructure Fabrication ◽  
Alumina Template ◽  
One Dimensional ◽  
Alumina Films ◽  
Porous Alumina Template ◽  
Ordered Porous ◽  
Anodisation Process

Porous alumina films are widely used as templates for fabricating one-dimensional (1-D) nanostructures such as nanowires or nanotubes. Using a two-step anodisation process, we have successfully optimized the growth conditions for fabricating highly ordered porous alumina films with pore diameters ranging from 20 to 150 nm, to be used as templates for 1-D nanostructure synthesis. The effects of the anodisation conditions on pore structure and the formation rate of the films were systematically studied. It was found that low electrolyte temperatures and agitations decreased the growth rate of the films but favored the process of pore ordering. Removal of oxide layer formed from first anodisation process and removal of barrier oxide at pore ends had an important bearing on pore morphology. Besides the stand-alone porous alumina films, we have also fabricated porous alumina films on rod-shaped Al substrates.

scholarly journals Litters of self-replicating origami cross-tiles

2019 ◽  
Vol 116 (6) ◽  
pp. 1952-1957 ◽  
Author(s):  
Rebecca Zhuo ◽  
Feng Zhou ◽  
Xiaojin He ◽  
Ruojie Sha ◽  
Nadrian C. Seeman ◽  
...  
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
Directed Evolution ◽  
Exponential Growth ◽  
Growth Conditions ◽  
One Dimensional ◽  
Replication System ◽  
Speed Up ◽  
Self Replication ◽  
Dimensional Crystal

Self-replication and exponential growth are ubiquitous in nature but until recently there were few examples of artificial self-replication. Often replication is a templated process where a parent produces a single offspring, doubling the population in each generation. Many species however produce more than one offspring at a time, enabling faster population growth and higher probability of species perpetuation. We have made a system of cross-shaped origami tiles that yields a number of offspring, four to eight or more, depending on the concentration of monomer units to be assembled. The parent dimer template serves as a seed to crystallize a one-dimensional crystal, a ladder. The ladder rungs are then UV–cross-linked and the offspring are then released by heating, to yield a litter of autonomous daughters. In the complement study, we also optimize the growth conditions to speed up the process and yield a 103increase in the growth rate for the single-offspring replication system. Self-replication and exponential growth of autonomous motifs is useful for fundamental studies of selection and evolution as well as for materials design, fabrication, and directed evolution. Methods that increase the growth rate, the primary evolutionary drive, not only speed up experiments but provide additional mechanisms for evolving materials toward desired functionalities.

Metal-Induced Low-Temperature Crystallization of Amorphous SiGe on Insulating Films

2002 ◽  
Vol 744 ◽  
Author(s):  
M. Miyao ◽  
H. Kanno ◽  
I. Tsunoda ◽  
T. Sadoh ◽  
A. Kenjo
Keyword(s):  
Low Temperature ◽  
Annealing Temperature ◽  
Growth Conditions ◽  
The Other ◽  
One Dimensional ◽  
Insulating Films ◽  
Low Temperature Crystallization ◽  
Advanced System ◽  
Ge Doping ◽  
Temperature Crystallization

ABSTRACTMetal-induced low temperature (≤ 550 °C) crystallization of a-Si1-xGex (0 ≤ × ≤ 1 ) layers on SiO2 films has been investigated. For low Ge fractions below 20 %, Ge-doping enhanced plane growth was observed. This realized strain-free poly-Si0.8Ge0.2 films with large grains (18 μm). On the other hand, dendrite growth was dominant for intermediate Ge fractions with 40–60 %. Directions and widths of dendrites became straight and narrow with decreasing annealing temperature. As a result, very sharp needlelike crystals (width: 0.05 μm, length: 10 μm) were obtained at the optimized growth conditions (x: 0.4, annealing: 450 °C, 20 h). These new polycrystalline SiGe films on insulators should be used for the advanced system-in-displays and novel one-dimensional wires.

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