Piezoelectric polarization promoted spatial separation of photoexcited electrons and holes in two-dimensional g-C3N4 nanosheets for efficient elimination of chlorophenols

2021 ◽  
pp. 126696
Author(s):  
Hua Lei ◽  
Qingshen He ◽  
Meixuan Wu ◽  
Yingying Xu ◽  
Pengfei Sun ◽  
...  
Keyword(s):  
Spatial Separation ◽  
Two Dimensional ◽  
Piezoelectric Polarization ◽  
Efficient Elimination

The Effect of Two-Dimensional and Three-Dimensional Distance on Apparent Motion

Perception ◽  
1983 ◽  
Vol 12 (3) ◽  
pp. 305-312 ◽  
Author(s):  
Kathleen Mutch ◽  
Isabel M Smith ◽  
Albert Yonas
Keyword(s):  
Motion Perception ◽  
Apparent Motion ◽  
Three Dimensional ◽  
Spatial Separation ◽  
Three Dimensions ◽  
Correspondence Problem ◽  
Two Dimensional ◽  
Motion Display ◽  
Specific Concern ◽  
Actual Depth

The problem of how the visual system matches corresponding inputs from one instant to the next to produce the perception of motion has been experimentally examined. The specific concern was whether this correspondence problem is solved prior to the interpretation of three-dimensional distance. Observers judged the degree of apparent motion between pairs of lights in a conflicting motion display. Spatial separation of the lights was varied in two and three dimensions in order to assess whether retinal distance, actual depth, or some combination of these provided critical information for correspondence. The results support Ullman's contention that only two-dimensional (retinal) distances are used in establishing correspondence in motion perception.

Two dimensional electron gases induced by spontaneous and piezoelectric polarization in undoped and doped AlGaN/GaN heterostructures

2000 ◽  
Vol 87 (1) ◽  
pp. 334-344 ◽  
Author(s):  
O. Ambacher ◽  
B. Foutz ◽  
J. Smart ◽  
J. R. Shealy ◽  
N. G. Weimann ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Gases ◽  
Piezoelectric Polarization

Two Dimensionality of the Correspondence Process in Apparent Motion

Perception ◽  
1978 ◽  
Vol 7 (6) ◽  
pp. 683-693 ◽  
Author(s):  
Shimon Ullman
Keyword(s):  
Motion Perception ◽  
Apparent Motion ◽  
Spatial Separation ◽  
Two Dimensional ◽  
Fundamental Process

A fundamental process underlying motion perception is the matching of corresponding elements in different views. In this correspondence process spatial separation between elements plays a major role. The relevant separation is shown by the current study to be the two-dimensional, uninterpreted distance, a finding that has an implication to the level at which the correspondence process is carried out. The current findings are compared with earlier results concerning ‘optimality’ of apparent motion to conclude that optimality cannot serve as a measure for the correspondence strength.

scholarly journals Spatially separating redox centers on 2D carbon nitride with cobalt single atom for photocatalytic H2O2production

2020 ◽  
Vol 117 (12) ◽  
pp. 6376-6382 ◽  
Author(s):  
Chiheng Chu ◽  
Qianhong Zhu ◽  
Zhenhua Pan ◽  
Srishti Gupta ◽  
Dahong Huang ◽  
...  
Keyword(s):  
Charge Separation ◽  
Carbon Nitride ◽  
Spatial Separation ◽  
Single Atom ◽  
Two Dimensional ◽  
Oxidation Activity ◽  
Center Edge ◽  
Simultaneous Loading ◽  
Photosynthetic Reactions ◽  
Redox Centers

Redox cocatalysts play crucial roles in photosynthetic reactions, yet simultaneous loading of oxidative and reductive cocatalysts often leads to enhanced charge recombination that is detrimental to photosynthesis. This study introduces an approach to simultaneously load two redox cocatalysts, atomically dispersed cobalt for improving oxidation activity and anthraquinone for improving reduction selectivity, onto graphitic carbon nitride (C3N4) nanosheets for photocatalytic H2O2production. Spatial separation of oxidative and reductive cocatalysts was achieved on a two-dimensional (2D) photocatalyst, by coordinating cobalt single atom above the void center of C3N4and anchoring anthraquinone at the edges of C3N4nanosheets. Such spatial separation, experimentally confirmed and computationally simulated, was found to be critical for enhancing surface charge separation and achieving efficient H2O2production. This center/edge strategy for spatial separation of cocatalysts may be applied on other 2D photocatalysts that are increasingly studied in photosynthetic reactions.

scholarly journals Gamma-Band Correlations in Primary Visual Cortex

2018 ◽  
Author(s):  
Xiaochen Morning Liu ◽  
Paula Sanz-Leon ◽  
P. A. Robinson
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Time Lag ◽  
Spatial Separation ◽  
Gamma Band ◽  
Two Dimensional ◽  
Neural Field Theory ◽  
Cross Correlations ◽  
Correlation Properties ◽  
Zero Time

Neural field theory is used to quantitatively analyze the two-dimensional spatiotemporal correlation properties of gamma-band (30 - 70 Hz) oscillations evoked by stimuli arriving at the primary visual cortex (V1), and modulated by patchy connectivities that depend on orientation preference (OP). Correlation functions are derived analytically under different stimulus and measurement conditions. The predictions reproduce a range of published experimental results, including the existence of two-point oscillatory temporal cross-correlations with zero time-lag between neurons with similar OP, the influence of spatial separation of neurons on the strength of the correlations, and the effects of differing stimulus orientations.

A theoretical design of photodetectors based on two-dimensional Sb/AlAs type-II heterostructures

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yifan Jia ◽  
Xing Wei ◽  
Zhihui Zhang ◽  
Jian Liu ◽  
Ye Tian ◽  
...  
Keyword(s):  
Spatial Separation ◽  
Band Alignment ◽  
Type Ii ◽  
Two Dimensional ◽  
Theoretical Design

Sb/AlAs heterostructures with direct-gap and type-II band alignment can effectively facilitate the spatial separation of photogenerated carriers.

Two-dimensional electron gases induced by spontaneous and piezoelectric polarization charges in N- and Ga-face AlGaN/GaN heterostructures

1999 ◽  
Vol 85 (6) ◽  
pp. 3222-3233 ◽  
Author(s):  
O. Ambacher ◽  
J. Smart ◽  
J. R. Shealy ◽  
N. G. Weimann ◽  
K. Chu ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Gases ◽  
Piezoelectric Polarization

Observation of Polarization and Two-Dimensional Electron Gas in AlGaN/GaN Heterostructure Using Scanning Nonlinear Dielectric Microscopy

2015 ◽  
Author(s):  
K. Hirose ◽  
N. Chinone ◽  
Y. Cho
Keyword(s):  
Spontaneous Polarization ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Nonlinear Dielectric ◽  
Piezoelectric Polarization ◽  
Polarization Profile ◽  
Dimensional Electron Gas ◽  
Gan Heterostructure

Abstract We measured AlGaN/GaN heterostructure using scanning nonlinear dielectric microscopy (SNDM) [1], which can measure both carrier and polarization profile in AlGaN/GaN heterostructure. As a result, GaN spontaneous polarization and AlGaN polarization which is sum of spontaneous polarization and piezoelectric polarization were clearly distinguished. Two dimensional electron gas (2DEG) was observed at the AlGaN/GaN interface. This results show that SNDM is useful method for evaluation of 2DEG profile and polarization profile in AlGaN/GaN heterostructure.

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