The roles of buckled geometry and water environment in the excitonic properties of graphitic C3N4

Nanoscale ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 3738-3743 ◽  
Author(s):  
Jiuyu Sun ◽  
Xingxing Li ◽  
Jinlong Yang
Keyword(s):  
Water Environment ◽  
Excitation Mechanism ◽  
Excitonic Properties ◽  
Insight Into

An insight into the photo-excitation mechanism of 2D photocatalyst g-C3N4 in a water environment.

A late Cisuralian (early Permian) brachiopod fauna from the Taungnyo Group in the Zwekabin Range, eastern Myanmar and its biostratigraphic, paleobiogeographic, and tectonic implications

2021 ◽  
pp. 1-31
Author(s):  
Hai-peng Xu ◽  
Kyi Pyar Aung ◽  
Yi-chun Zhang ◽  
G.R. Shi ◽  
Fu-long Cai ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Cold Water ◽  
Water Environment ◽  
Climatic Conditions ◽  
Early Permian ◽  
The North ◽  
Southern Thailand ◽  
Brachiopod Fauna ◽  
Insight Into ◽  
Different Parts

Abstract The tectonic evolution of the Sibumasu Block during the Permian remains controversial, and Permian faunas and their paleobiogeographic affinities provide some insight into its paleogeographic and tectonic evolutionary histories. In this paper, a new brachiopod fauna dominated by Spinomartinia prolifica Waterhouse, 1981 is described from the uppermost part of the Taungnyo Group in the Zwekabin Range, eastern Myanmar. This brachiopod fauna includes 23 species and its age is well constrained as late Kungurian by the associated conodonts, i.e., Vjalovognathus nicolli Yuan et al., 2016 and Mesogondolella idahoensis (Youngquist, Hawley, and Miller, 1951), contrary to the late Sakmarian age given to the same brachiopod faunas previously reported from southern Thailand and Malaysia. Based on comprehensive comparisons of the Cisuralian brachiopod faunas and other data in different parts of the Sibumasu Block, we consider that they are better subdivided into two independent stratigraphic assemblages, i.e., the lower (earlier) Bandoproductus monticulus-Spirelytha petaliformis Assemblage of a Sakmarian to probably early Artinskian age, and the upper (younger) Spinomartinia prolifica-Retimarginifera alata Assemblage of a late Kungurian age. The former assemblage is a typical cold-water fauna, mainly composed of Gondwanan-type genera, e.g., Bandoproductus Jin and Sun, 1981, Spirelytha Fredericks, 1924, and Sulciplica Waterhouse, 1968. The latter assemblage is strongly characterized by an admixture of both Cathaysian and Gondwanan elements, as well as some genera restricted to the Cimmerian continents. Notably, the spatial distribution pattern of these two separate brachiopod assemblages varies distinctly. The Sakmarian cold-water brachiopod faunas have been found in association with glacial-marine diamictites throughout the Sibumasu Block including both the Irrawaddy and Sibuma blocks. In contrast, the Kungurian biogeographically mixed brachiopod faunas are only recorded in the Irrawaddy Block, unlike the Sibuma Block that contains a contemporaneous paleotropical Tethyan fusuline fauna. Thus, it appears likely that by the end of Cisuralian (early Permian), the Sibumasu Block comprised the Irrawaddy Block in the south with cool climatic conditions, and the Sibuma Block in the north with a temperate to warm-water environment, separated by the incipient Thai-Myanmar Mesotethys.

Functionalizingλ-AlOOH Surface with Silanol -- an Ab-initio Study

2007 ◽  
Vol 1000 ◽  
Author(s):  
Petri Lehtinen ◽  
Guido Grundmeier ◽  
Alexander Blumenau
Keyword(s):  
Ab Initio ◽  
Adsorption Process ◽  
Water Environment ◽  
Water Molecules ◽  
Organic Film ◽  
Oh Groups ◽  
Inorganic Films ◽  
Adsorption Of Water ◽  
Zinc Coatings ◽  
Insight Into

AbstractOn HDG-steel, zinc coatings are used for corrosion protection. Part of that coating is composed of aluminum and this leads to the creation of aluminum oxide film on the coating with thicknesses of 2-3 nanometers. This layer is an amorphous boehmite film.Boehmite, or λ-AlOOH, has several application areas, but for us the interesting ones are related to an area where the surface is functionalized, for example in a way that the organic and inorganic films can be “glued” together. A good candidate for the interface is the silanol molecule. The idea is that the OH-groups of the molecule attach on the inorganic film and the methyl groups on the organic film and hence promote adhesion between the two.We present theoretical ab-initio results of adsorption of water and silanol molecules on the λ AlOOH (0001)-surface. Since the experimental adsorption of the silanol on the boehmite surface is done in water environment, the adsorption process is therefore a competing process. We will present some result of adsorption of silanol in the presence of water molecules to get an insight into this process.

scholarly journals A MD Simulation and Analysis for Aggregation Behaviors of Nanoscale Zero-Valent Iron Particles in Water via MS

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Ying Zhao ◽  
Dongmei Liu ◽  
Huan Tang ◽  
Jing Lu ◽  
Fuyi Cui
Keyword(s):  
Particle Size ◽  
Water Environment ◽  
Simulation System ◽  
Theoretical Research ◽  
Initial Distance ◽  
Aggregation Behaviors ◽  
Dynamics Simulations ◽  
Existing Form ◽  
Materials Studio ◽  
Insight Into

With the development of nanotechnology, more nanomaterials will enter into water environment system. Studying the existing form of nanomaterials in water environment will help people benefit from the correct use of them and to reduce the harm to human caused by them for some nanomaterials can bring polluting effect. Aggregation is a main behavior for nanoparticle in water environment. NZVI are used widely in many fields resulting in more NZVI in water environment. Molecular dynamics simulations and Materials Studio software are used to investigate the microaggregation behaviors of NZVI particles. Two scenes are involved: (1) particle size of NZVI in each simulation system is the same, but initial distance of two NZVI particles is different; (2) initial distance of two NZVI particles in each simulation system is the same, but particle size of NZVI is different. Atomistic trajectory, NP activity, total energy, and adsorption of H2O are analyzed with MS. The method provides new quantitative insight into the structure, energy, and dynamics of the aggregation behaviors of NZVI particles in water. It is necessary to understand microchange of NPs in water because it can provide theoretical research that is used to reduce polluting effect of NPs on water environment.

Strain Rate Calculation Approach in Environmental Fatigue Evaluations

2010 ◽  
Author(s):  
Mark A. Gray ◽  
Matthew C. Salac ◽  
David H. Roarty ◽  
E. Lyles Cranford
Keyword(s):  
Strain Rate ◽  
Water Environment ◽  
Reactor Water ◽  
Regulatory Documents ◽  
Penalty Factor ◽  
Starting Point ◽  
Asme Code ◽  
Rate Calculation ◽  
License Renewal ◽  
Insight Into

Fatigue usage factor evaluations including the effects of reactor water environment have been performed in numerous nuclear plant license renewal efforts. A large number of these evaluations have used the environmental fatigue penalty factor, Fen, approach prescribed in various regulatory documents. The Fen equations require input of strain rate, but the prescribing documents do not provide methodology or criteria for the quantification of the strain rate to be input. As a result, numerous approaches have been offered and studied. This paper presents an approach used by Westinghouse to include strain rate in an automated calculation of Fen based on the modified rate approach to integrated strain rate applications. The starting point of the approach is ASME Code Section III NB-3200 fatigue analysis. With environmental fatigue evaluations in new plant designs now emerging in ASME Code criteria, strain rate considerations remain part of the discussion. The intent of this paper is to provide further insight into this process.

scholarly journals How seaweeds release the excess energy from sunlight to surrounding sea water

2017 ◽  
Vol 19 (24) ◽  
pp. 15745-15753 ◽  
Author(s):  
Kenichi Koizumi ◽  
Makoto Hatakeyama ◽  
Mauro Boero ◽  
Katsuyuki Nobusada ◽  
Hirokazu Hori ◽  
...  
Keyword(s):  
Liquid Water ◽  
Marine Algae ◽  
Sea Water ◽  
Water Environment ◽  
Electron Excitation ◽  
Excess Energy ◽  
Insight Into

We report an atomistic insight into the mechanism regulating the energy released by a porphyra-334 molecule, the ubiquitous photosensitive component of marine algae, in a liquid water environment upon an electron excitation.

scholarly journals A generalized Stark effect electromodulation model for extracting excitonic properties in organic semiconductors

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Taili Liu ◽  
Yishu Foo ◽  
Juan Antonio Zapien ◽  
Menglin Li ◽  
Sai-Wing Tsang
Keyword(s):  
Organic Semiconductors ◽  
Stark Effect ◽  
Optical Effect ◽  
Organic Film ◽  
Reflection And Transmission ◽  
Continuum State ◽  
Transmission Modes ◽  
Properties Of Materials ◽  
Excitonic Properties ◽  
Insight Into

Abstract Electromodulation (EM) spectroscopy, a powerful technique to monitor the changes in polarizability p and dipole moment u of materials upon photo-excitation, can bring direct insight into the excitonic properties of materials. However, extracting Δp and Δu from the electromodulation spectrum relies on fitting with optical absorption of the materials where optical effect in different device geometries might introduce large variation in the extracted values. Here, we demonstrate a systematic electromodulation study with various fitting approaches in both commonly adopted reflection and transmission device architectures. Strikingly, we have found that the previously ascribed continuum state threshold from the deviation between the measured and fitting results is questionable. Such deviation is found to be caused by the overlooked optical interference and electrorefraction effect. A generalized electromodulation model is proposed to incorporate the two effects, and the extracted Δp and Δu have excellent consistency in both reflection and transmission modes in all organic film thicknesses.

Strain Rate Calculation Approach in Environmental Fatigue Evaluations

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Mark A. Gray ◽  
Matthew C. Salac ◽  
David H. Roarty ◽  
E. Lyles Cranford
Keyword(s):  
Strain Rate ◽  
Water Environment ◽  
Reactor Water ◽  
Regulatory Documents ◽  
Penalty Factor ◽  
Starting Point ◽  
Asme Code ◽  
Rate Calculation ◽  
License Renewal ◽  
Insight Into

Fatigue usage factor evaluations including the effects of reactor water environment have been performed in numerous nuclear plant license renewal efforts. A large number of these evaluations have used the environmental fatigue penalty factor, Fen, approach prescribed in various regulatory documents. The Fen equations require input of strain rate, but the prescribing documents do not provide methodology or criteria for the quantification of the strain rate to be input. As a result, numerous approaches have been offered and studied. This paper presents an approach used by Westinghouse to include strain rate in an automated calculation of Fen based on the modified rate approach (MRA) to integrated strain rate applications. The starting point of the approach is ASME Code Section III NB-3200 fatigue analysis. With environmental fatigue evaluations in new plant designs now emerging in ASME Code criteria, strain rate considerations remain part of the discussion. The intent of this paper is to provide further insight into this process.

Interference Effects in Two-Step Reaction Processes

1972 ◽  
Vol 50 (7) ◽  
pp. 700-702 ◽  
Author(s):  
D. G. Burke ◽  
J. C. Waddington
Keyword(s):  
Simple Expression ◽  
Single Step ◽  
Excitation Mechanism ◽  
Interference Effects ◽  
Reaction Paths ◽  
Reaction Processes ◽  
Insight Into

In reaction studies on even–even target nuclei, one is frequently interested in a state for which (a) the population by single-step processes is forbidden, (b) the dominant excitation mechanism is by two-step processes, and (c) two competing reaction paths are involved. A simple expression is given for such cases which offers some insight into the effects of interference between these two paths. A comparison of the predictions of this expression with several types of experiment is presented. In particular, an interpretation is presented for some recent (3He, α) reaction results which could not previously be explained.

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