Regulating structural dimensionality and emission colors by organic conjugation between SmIII at a fixed distance

2018 ◽  
Vol 47 (20) ◽  
pp. 6908-6916
Author(s):  
Hai-Bing Xu ◽  
Jie Wang ◽  
Xue-Li Chen ◽  
Peng Xu ◽  
Kang-Tai Xiong ◽  
...  
Keyword(s):  
Topological Structures ◽  
Fixed Distance ◽  
Structural Dimensionality

Linking by similar lengths but different conjugated diphosphine dioxides, various topological structures and emission colors of samarium(iii) complexes was achieved.

scholarly journals Some nano topological structures via ideals and graphs

2020 ◽  
Vol 28 (1) ◽  
Author(s):  
Abd El-Fattah A. El-Atik ◽  
Hanan Z. Hassan
Keyword(s):  
Topological Structures

scholarly journals Creating polar antivortex in PbTiO3/SrTiO3 superlattice

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Adeel Y. Abid ◽  
Yuanwei Sun ◽  
Xu Hou ◽  
Congbing Tan ◽  
Xiangli Zhong ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Phase Field ◽  
Driving Force ◽  
Topological Phase ◽  
Phase Field Simulation ◽  
Topological Structures ◽  
Field Simulation ◽  
Condensed Matters ◽  
Topological Phase Transitions ◽  
Insight Into

AbstractNontrivial topological structures offer a rich playground in condensed matters and promise alternative device configurations for post-Moore electronics. While recently a number of polar topologies have been discovered in confined ferroelectric PbTiO3 within artificially engineered PbTiO3/SrTiO3 superlattices, little attention was paid to possible topological polar structures in SrTiO3. Here we successfully create previously unrealized polar antivortices within the SrTiO3 of PbTiO3/SrTiO3 superlattices, accomplished by carefully engineering their thicknesses guided by phase-field simulation. Field- and thermal-induced Kosterlitz–Thouless-like topological phase transitions have also been demonstrated, and it was discovered that the driving force for antivortex formation is electrostatic instead of elastic. This work completes an important missing link in polar topologies, expands the reaches of topological structures, and offers insight into searching and manipulating polar textures.

Computational Capacity of Complex Memcapacitive Networks

2021 ◽  
Vol 17 (2) ◽  
pp. 1-25
Author(s):  
Dat Tran ◽  
Christof Teuscher
Keyword(s):  
Power Consumption ◽  
Small World ◽  
Fading Memory ◽  
Reservoir Computing ◽  
Topological Transformation ◽  
Trade Off ◽  
Topological Structures ◽  
Computational Capacity ◽  
Computational Capability ◽  
Comparable Performance

Emerging memcapacitive nanoscale devices have the potential to perform computations in new ways. In this article, we systematically study, to the best of our knowledge for the first time, the computational capacity of complex memcapacitive networks, which function as reservoirs in reservoir computing, one of the brain-inspired computing architectures. Memcapacitive networks are composed of memcapacitive devices randomly connected through nanowires. Previous studies have shown that both regular and random reservoirs provide sufficient dynamics to perform simple tasks. How do complex memcapacitive networks illustrate their computational capability, and what are the topological structures of memcapacitive networks that solve complex tasks with efficiency? Studies show that small-world power-law (SWPL) networks offer an ideal trade-off between the communication properties and the wiring cost of networks. In this study, we illustrate the computing nature of SWPL memcapacitive reservoirs by exploring the two essential properties: fading memory and linear separation through measurements of kernel quality. Compared to ideal reservoirs, nanowire memcapacitive reservoirs had a better dynamic response and improved their performance by 4.67% on three tasks: MNIST, Isolated Spoken Digits, and CIFAR-10. On the same three tasks, compared to memristive reservoirs, nanowire memcapacitive reservoirs achieved comparable performance with much less power, on average, about 99× , 17×, and 277×, respectively. Simulation results of the topological transformation of memcapacitive networks reveal that that topological structures of the memcapacitive SWPL reservoirs did not affect their performance but significantly contributed to the wiring cost and the power consumption of the systems. The minimum trade-off between the wiring cost and the power consumption occurred at different network settings of α and β : 4.5 and 0.61 for Biolek reservoirs, 2.7 and 1.0 for Mohamed reservoirs, and 3.0 and 1.0 for Najem reservoirs. The results of our research illustrate the computational capacity of complex memcapacitive networks as reservoirs in reservoir computing. Such memcapacitive networks with an SWPL topology are energy-efficient systems that are suitable for low-power applications such as mobile devices and the Internet of Things.

scholarly journals The solar cycle variation of topological structures in the global solar corona

2014 ◽  
Vol 565 ◽  
pp. A44 ◽  
Author(s):  
S. J. Platten ◽  
C. E. Parnell ◽  
A. L. Haynes ◽  
E. R. Priest ◽  
D. H. Mackay
Keyword(s):  
Solar Cycle ◽  
Solar Corona ◽  
Solar Cycle Variation ◽  
Topological Structures ◽  
Cycle Variation

Modulation of Electronic Properties of Single Wall Carbon Nanotubes by the Presence of an Ionic Shell

2006 ◽  
Vol 915 ◽  
Author(s):  
Vladimir Dobrokhotov ◽  
Chris Berven
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Band Structure ◽  
Metal Ion ◽  
Single Wall Carbon Nanotubes ◽  
Functionalized Carbon Nanotubes ◽  
Ion Sensing ◽  
Fixed Distance ◽  
Metal Ion Sensing ◽  
Heavy Metal Ion Sensing

AbstractWe report the change to the band structure of two types of carbon nanotubes due to the presence of an isolated, non-conducting, uniformly charged shell held at a fixed distance above their surfaces. We find that, depending on the chirality of the nanotube, the strain on the lattice causes the dispersion relationships to change. This change can result in a modification of the band structure which can induce a metal-semiconductor transition. We consider these effects as a possible mechanism for heavy-metal ion sensing by functionalized carbon-nanotubes.

Intramolecular light-induced electron transfer in a rigid, fixed-distance anthracene-N,N-dimethylaniline system. Exciplex-like behavior

1990 ◽  
Vol 112 (7) ◽  
pp. 2823-2824 ◽  
Author(s):  
Michael R. Wasielewski ◽  
David W. Minsek ◽  
Mark P. Niemczyk ◽  
Walter A. Svec ◽  
Nien Chu C. Yang
Keyword(s):  
Electron Transfer ◽  
Fixed Distance
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