scholarly journals Local Polarization, Charge Compensation, and Chemical Interactions on Ferroelectric Surfaces: a Route Toward New Nanostructures

2001 ◽  
Vol 688 ◽  
Author(s):  
Dawn A. Bonnell ◽  
Sergei V. Kalinin
Keyword(s):  
Chemical Reactivity ◽  
Charge Compensation ◽  
Switching Behavior ◽  
New Approach ◽  
Domain Specific ◽  
Ferroelectric Surfaces ◽  
Local Polarization ◽  
Enthalpy And Entropy ◽  
Specific Reactivity ◽  
Entropy Of Adsorption

AbstractThe local potential at domains on ferroelectric surfaces results from the interplay between atomic polarization and screening charge. The presence of mobile charge affects surface domain configuration, switching behavior, and surface chemical reactions. By measuring the temperature and time dependence of surface potential and piezo response with scanning probe microscopies, thermodynamic parameters associated with charge screening are determined. This is illustrated for the case of BaTiO3 (100) in air, for which the charge compensation mechanism is surface adsorption and enthalpy and entropy of adsorption are determined. The local electrostatic fields in the vicinity of the domains have a dominant effect on chemical reactivity. Photoreduction of a large variety of metals can be localized to domains with the appropriate surface charge. It has been demonstrated that proximal probe tips can be used to switch polarization direction locally. Combining the ability to ‘write’ domains of local polarization with domain specific reactivity of metals, vapors of small molecules, and organic compounds leads to a new approach to fabricating complex nanostructures.

scholarly journals A new approach to improve the electrochemical performance of ZnMn2O4 through a charge compensation mechanism using the substitution of Al3+ for Zn2+

RSC Advances ◽  
2018 ◽  
Vol 8 (14) ◽  
pp. 7361-7368
Author(s):  
Xianyu Zhu ◽  
Jingbin Quan ◽  
Jichun Huang ◽  
Zheng Ma ◽  
Yixin Chen ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Charge Compensation ◽  
Compensation Mechanism ◽  
New Approach ◽  
A Charge

This work reports the nonequivalent substitution of ZnMn2O4. This is a new approach to improve the electrochemical performance of ZnMn2O4 through a charge compensation mechanism using the substitution of Al3+ for Zn2+.

AN OBJECT-BASED APPROACH TO MANAGING DOMAIN SPECIFIC THESAURI: SEMIAUTOMATIC THESAURUS CONSTRUCTION AND QUERY-BASED BROWSING

2002 ◽  
Vol 12 (04) ◽  
pp. 363-389 ◽  
Author(s):  
JAE HUN CHOI ◽  
JAE DONG YANG ◽  
DONG GILL LEE
Keyword(s):  
Object Oriented ◽  
Domain Expert ◽  
Considerable Part ◽  
New Approach ◽  
Domain Experts ◽  
Domain Specific ◽  
Object Based ◽  
Boolean Queries

In this paper, we propose a new approach for managing domain specific thesauri, where object-oriented paradigm is applied to thesaurus construction and query-based browsing. The approach provides an object-oriented mechanism to assist domain experts in constructing thesauri; it determines a considerable part of relationship degrees between terms by inheritance and supplies the domain expert with information available from other parts of the thesaurus being constructed or already constructed. In addition to that, it enables domain experts to incrementally construct the thesaurus, since the automatically determined relationship degrees can be refined whenever a more sophisticated thesaurus is needed. It may minimize domain experts' burden caused by the exhaustive specification of individual relationship. This approach also provides a query-based browsing facility, which enables users to find desired thesaurus terms without tedious browsing in the thesaurus. A browsing query can be formulated with terms rather ambiguous, yet capable of deriving the desired terms. This browsing query is useful especially when users want precise results. In other words, it is useful when they want to use only thesaurus terms carefully selected in reformulating Boolean queries. To demonstrate the feasibility of our approach, we fully implemented an object-based thesaurus system, which supports the semiautomatic thesaurus construction and the query-based browsing facility.

Computational Model of Domain-Specific Reactivity on Coated Ferroelectric Photocatalysts

2016 ◽  
Vol 120 (23) ◽  
pp. 12673-12684 ◽  
Author(s):  
James J. Glickstein ◽  
Paul A. Salvador ◽  
Gregory S. Rohrer
Keyword(s):  
Computational Model ◽  
Domain Specific ◽  
Specific Reactivity

scholarly journals In situ deposition/positioning of magnetic nanoparticles with ferroelectric nanolithography

2005 ◽  
Vol 20 (3) ◽  
pp. 712-718 ◽  
Author(s):  
Xiaojun Lei ◽  
Dongbo Li ◽  
Rui Shao ◽  
Dawn A. Bonnell
Keyword(s):  
Electron Hole ◽  
Reactive Metal ◽  
New Approach ◽  
Surface Electronic Structure ◽  
Multiple Components ◽  
In Situ Deposition ◽  
Ferroelectric Domains ◽  
Local Polarization ◽  
Direct Attachment

Ferroelectric nanolithography is a new approach to processing nanostructures, which can position multiple components made of various materials into predefined configurations. Local polarization in ferroelectric compounds is manipulated to control the surface electronic structure and direct attachment of molecules and particles. Here, the presence of optically excited electron-hole pairs on ferroelectric domains is confirmed, and reaction paths for photo reduction of several reactive metal particles are determined. Subsequent and simultaneous deposition of multiple metals is demonstrated, and the magnetic properties of Co based particles are confirmed.

scholarly journals Interactive, Orthogonal Hyperedge Routing in Schematic Diagrams Assisted by Layout Automatisms

2021 ◽  
pp. 20-27
Author(s):  
Stefan Helmke ◽  
Bernhard Goetze ◽  
Robert Scheffler ◽  
Gregor Wrobel
Keyword(s):  
Software Framework ◽  
Engineering Systems ◽  
Domain Specific Languages ◽  
New Approach ◽  
Design Task ◽  
Domain Specific ◽  
Design Object ◽  
Object Graph ◽  
Schematic Diagrams

AbstractSchematic diagrams are used in graph-based engineering systems. They focus mainly on the structure of the design object. Graph-based engineering systems help to solve a concrete design task. This is primarily realized by the application of domain-specific languages. The layout of schematic diagrams is of particular importance, and a neat representation is desirable. But automatically generated layouts cannot always fully match the intention of a modeler. To improve automatic layouts and enable a user-specific representation, an algorithm that allows interactive changes of the orthogonal hyperedge geometry was implemented. In this paper, we present this algorithm and give an overview of such interactions. Additionally, several reductions of the hyperedge geometry are shown. Furthermore, a local, automatic routing considering interactions on the hyperedge geometry is presented. The consideration of domain-specific semantics and the possibility of interactive changes is a new approach. All algorithms were implemented in a self-developed software framework.

Thermodynamics of Adsorption of Methyl Formate on Metal Dopant/Active Carbon Systems

1993 ◽  
Vol 58 (3) ◽  
pp. 474-482 ◽  
Author(s):  
Muhammad Afzal ◽  
Fazal Mahmood
Keyword(s):  
Free Energy ◽  
Active Carbon ◽  
Methyl Formate ◽  
Nitrogen Adsorption ◽  
Detailed Examination ◽  
Adsorption Affinity ◽  
Adsorption Data ◽  
Enthalpy And Entropy ◽  
Metal Doped ◽  
Entropy Of Adsorption

It has been found that doping of active carbon with metals (Ni, Cu, Zn, Cd) decreases its surface area due to dispersion of metal resides on the surface. A detailed examination of nitrogen adsorption indicates differences in the mode of dispersion of metals on the surface of active carbon. The adsorbing behavior of metal doped carbon for methyl formate was also studied as a function of temperature. From adsorption data, thermodynamic parameters such as free energy, enthalpy and entropy of adsorption were calculated using virial isotherm expression and interpreted. Results show that metal dopant/active carbon systems are synergic, exhibiting greater adsorption affinity for methyl formate than the sum of its constituents.

scholarly journals Efficient Dual Domain Decoding of Linear Block Codes Using Genetic Algorithms

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Ahmed Azouaoui ◽  
Mostafa Belkasmi ◽  
Abderrazak Farchane
Keyword(s):  
Quadratic Residue ◽  
Block Codes ◽  
Specific Information ◽  
Crossover Operator ◽  
Computationally Efficient ◽  
New Approach ◽  
Decoding Algorithms ◽  
Linear Block Codes ◽  
Domain Specific ◽  
Dual Domain

A computationally efficient algorithm for decoding block codes is developed using a genetic algorithm (GA). The proposed algorithm uses the dual code in contrast to the existing genetic decoders in the literature that use the code itself. Hence, this new approach reduces the complexity of decoding the codes of high rates. We simulated our algorithm in various transmission channels. The performance of this algorithm is investigated and compared with competitor decoding algorithms including Maini and Shakeel ones. The results show that the proposed algorithm gives large gains over the Chase-2 decoding algorithm and reach the performance of the OSD-3 for some quadratic residue (QR) codes. Further, we define a new crossover operator that exploits the domain specific information and compare it with uniform and two point crossover. The complexity of this algorithm is also discussed and compared to other algorithms.

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