Design and performance of a minielectrochemical cell for spatial resolution of two-dimensional structures

1991 ◽  
Vol 63 (23) ◽  
pp. 2777-2786 ◽  
Author(s):  
Jason N. Howard ◽  
Carl A. Koval
2021 ◽  
Vol 9 (6) ◽  
pp. 479-498
Author(s):  
Konstantin Boltar ◽  
Igor Burlakov ◽  
Natalya Iakovleva ◽  
Alekcey Polessky ◽  
Peter Kuznetsov ◽  
...  

In this paper, we report on the design, the fabrication, and performance of SWIR photomodules using sensitive two-dimensional arrays based on InGaAs-heterostructures. The de- sign of suggested InGaAs-heterostructure includes InAlAs wideband barrier layer and high sensitive absorber InGaAs layer which are increasing the uniformity and operability of focal plane array (FPA), so the number of defect elements are less than 0.5 %. The possibilities of spectral range expanding into short-wavelength to 0.5 μm and into long-wavelength to 2.2 μm regions have been considered. The operation principals of active-pulse system for 0.9–1.7 μm spectral range based on InGaAs 320256 FPA with 30 μm pitch have been presented. The investigations showed that the infrared gated-viewing system based on the InGaAs 320256 FPA provided a spatial resolution of 0,6 m.


2020 ◽  
Author(s):  
Qi-Chao Sun ◽  
Tiancheng Song ◽  
Eric Anderson ◽  
Tetyana Shalomayeva ◽  
Johannes Förster ◽  
...  

Abstract Magnetic-domain structure and dynamics play an important role in understanding and controlling the magnetic properties of two-dimensional magnets, which are of interest to both fundamental studies and applications. However, the probe methods based on the spin-dependent optical permeability and electrical conductivity can neither provide quantitative information of the magnetization nor achieve nanoscale spatial resolution. These capabilities are essential to image and understand the rich properties of magnetic domains. Here, we employ cryogenic scanning magnetometry using a single-electron spin of a nitrogen-vacancy center in a diamond probe to unambiguously prove the existence of magnetic domains and study their dynamics in atomically thin CrBr3. The high spatial resolution of this technique enables imaging of magnetic domains and allows to resolve domain walls pinned by defects. By controlling the magnetic domain evolution as a function of magnetic field, we find that the pinning effect is a dominant coercivity mechanism with a saturation magnetization of about 26μB/nm2 for bilayer CrBr3. The magnetic-domain structure and pinning-effect dominated domain reversal process are verified by micromagnetic simulation. Our work highlights scanning nitrogen-vacancy center magnetometry as a quantitative probe to explore two-dimensional magnetism at the nanoscale.


Author(s):  
Hiroaki Shishido ◽  
Kazuma Nishimura ◽  
The Dang Vu ◽  
Kazuya Aizawa ◽  
Kenji M Kojima ◽  
...  

Author(s):  
L Malard ◽  
Lucas Lafetá ◽  
Renan Cunha ◽  
Rafael Nadas ◽  
Andreij Gadelha ◽  
...  

Raman spectroscopy is established as a valuable tool to study and characterize two-dimensional (2D) systems, but it exhibits two drawbacks: a relatively weak signal response and a limited spatial resolution....


2006 ◽  
Vol 31 (2) ◽  
pp. 20-31
Author(s):  
Jia Beisi

Habraken points out that the architectural studio failed to bring students to basic questions in the architecture of everyday environments. Till criticizes that in a studio, it is only the professional value represented by the teachers that prevails. To investigate the reasons of the allegation, this paper introduces a learning model defined by David A. Kolb, in which a learning process consists of two dimensional movements: i.e., prehension (concrete experiences vs. abstract conceptualization) and transformation (reflection and experiment). The paper then inquires into Schön's observation in the studio learning mode characterized as reflection-in-action. It is found that this studio is mainly dealing with the transformation dimension, and prehension dimension is either suppressed or represented by the teacher's experiences and conceptions. The paper discovers that the cause of problems raised by Habraken and Till is the inherent lack of substance in the prehension dimension. The paper assesses a studio programme in which the basic questions of built environment were systematically introduced. It analyzes the students' reactions and performance in line with students' learning styles found using Kolb's Learning Style Inventory (LSI). It suggests that the students' learning activities are more diversified than what Schön could perceive. There is a possibility to adapt students' personal experience and abstract conceptualization which may play into the studio. By enhancing diversity of learning styles rather than letting one's learning style (reflection-in-action) prevail, the studio may become a platform in which students may learn from each other.


2016 ◽  
Vol 850 ◽  
pp. 144-151 ◽  
Author(s):  
Mehmet Fidan ◽  
Ömer Nezih Gerek

The Mycielski method is a prospering prediction algorithm which is based on searching and finding largest repeated binary patterns. It uses infinite-past data to devise a rule based prediction method on a time series. In this work, a novel two-dimensional (image processing) version of the Mycielski algorithm is proposed. Since the dimensionality definition of “past” data increases in two-dimensional signals, the proposed algorithm also needs to handle how the boundaries of the pixel cliques are iteratively extended in the neighborhood of a current pixel. The clique extension invokes novel similarity search strategies that depend on the chosen physical distance metric. The proposed prediction algorithm is used for predictive image compression and performance comparisons with other predictive coding methods are presented.


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