scholarly journals Recent progress in 2D group-VA semiconductors: from theory to experiment

2018 ◽  
Vol 47 (3) ◽  
pp. 982-1021 ◽  
Author(s):  
Shengli Zhang ◽  
Shiying Guo ◽  
Zhongfang Chen ◽  
Yeliang Wang ◽  
Hongjun Gao ◽  
...  
Keyword(s):  
Recent Progress ◽  
Fundamental Properties

This review provides recent theoretical and experimental progress in the fundamental properties, electronic modulations, fabrications and applications of 2D group-VA materials.

CdS-Based photocatalysts

2018 ◽  
Vol 11 (6) ◽  
pp. 1362-1391 ◽  
Author(s):  
Lei Cheng ◽  
Quanjun Xiang ◽  
Yulong Liao ◽  
Huaiwu Zhang
Keyword(s):  
Recent Progress ◽  
Fundamental Properties ◽  
Photocatalytic Applications

The review summarizes the recent progress in the synthesis, fundamental properties, morphology, photocatalytic applications and challenges of CdS-based photocatalysts.

Chairman’s opening remarks

1968 ◽  
Vol 171 (1022) ◽  
pp. 2-2 ◽  
Keyword(s):  
Organic Chemistry ◽  
Recent Progress ◽  
Chemical Elements ◽  
Fundamental Properties ◽  
The Earth ◽  
Present Context ◽  
Boron Nitrogen ◽  
Boron Carbon

First I would like to express some doubt about the suitability of the adjective ‘anomalous’, which in the present context can only mean ‘unusual’. Nothing in Nature can be truly anomalous in the broad scheme of things. Furthermore, the programme shows that what we are looking for is indication from known terrestrial biochemistry of directions in which we may find possible extensions to other bio-logical systems of a novel type, even to some in which the role of chemical elements may be modified or more drastically changed. Recent progress in organic chemistry offers many suggestions such as the boron-nitrogen and boron-carbon and phosphorus-nitrogen combinations. Silicon has often been suggested as a basis for life chemistry under non-terrestrial conditions. All these ideas have to be entertained as possibilities, but my own belief is that the carbon-oxygen-nitrogen-hydrogen structures would always be preferred as the basis of life in a range of conditions approximating to those of the Earth. This view is based on the fundamental properties of compounds of these elements and the nature of the chemical links between their atoms. Phosphorus, sulphur and various metals have essential parts to play, mainly in the promotion of biochemical transformations.

Diophantine approximation

2021 ◽  
Vol 34 (2) ◽  
pp. 205-229
Author(s):  
Noriko Hirata-Kohno
Keyword(s):  
Number Theory ◽  
Diophantine Approximation ◽  
Recent Progress ◽  
Padé Approximation ◽  
Pade Approximation ◽  
Fundamental Properties ◽  
Subspace Theorem ◽  
Diophantine Problems

This article gives an introductory survey of recent progress on Diophantine problems, especially consequences coming from Schmidt’s subspace theorem, Baker’s transcendence method and Padé approximation. We present fundamental properties around Diophantine approximation and how it yields results in number theory.

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

1970 ◽  
Vol 28 ◽  
pp. 478-479
Author(s):  
Teruo Someya ◽  
Jinzo Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Fields ◽  
Quantitative Study ◽  
Recent Progress ◽  
Ferroelectric Domain ◽  
Resolving Power ◽  
Surface Pattern ◽  
Crystal Surfaces ◽  
One Dimensional ◽  
Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

The Nature of Oxide Surfaces: Topographic and Electronic Structure

1993 ◽  
Vol 51 ◽  
pp. 966-967
Author(s):  
Dawn A. Bonnell ◽  
Yong Liang
Keyword(s):  
Transition Metal Oxides ◽  
Electronic Structures ◽  
Recent Progress ◽  
Spatial Localization ◽  
Level Of Detail ◽  
Scanning Tunneling ◽  
Oxide Surfaces ◽  
Tunneling Microscopy ◽  
Considerable Effort ◽  
Complete Understanding

Recent progress in the application of scanning tunneling microscopy (STM) and tunneling spectroscopy (STS) to oxide surfaces has allowed issues of image formation mechanism and spatial resolution limitations to be addressed. As the STM analyses of oxide surfaces continues, it is becoming clear that the geometric and electronic structures of these surfaces are intrinsically complex. Since STM requires conductivity, the oxides in question are transition metal oxides that accommodate aliovalent dopants or nonstoichiometry to produce mobile carriers. To date, considerable effort has been directed toward probing the structures and reactivities of ZnO polar and nonpolar surfaces, TiO2 (110) and (001) surfaces and the SrTiO3 (001) surface, with a view towards integrating these results with the vast amount of previous surface analysis (LEED and photoemission) to build a more complete understanding of these surfaces. However, the spatial localization of the STM/STS provides a level of detail that leads to conclusions somewhat different from those made earlier.

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