Microscopic Spatial Distribution of Bound Excitons in High-Quality ZnO

2005 ◽  
pp. 1065-0
Author(s):  
F. Bertram ◽  
Daniel Forster ◽  
J. Christen ◽  
N. Oleynik ◽  
Armin Dadgar ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
High Quality

scholarly journals Edelmetallgegenstände als Quellen zu sozialen Prozessen der Spätawarenzeit (8.–9. Jahrhundert n. Chr.)

2021 ◽  
Vol 72 (2) ◽  
pp. 417-452
Keyword(s):  
Spatial Distribution ◽  
Precious Metal ◽  
Eighth Century ◽  
Carpathian Basin ◽  
Early Medieval ◽  
High Quality ◽  
Cultural Changes ◽  
Archaeological Material ◽  
Metal Artefacts ◽  
The Social

Abstract The present paper analyses the precious metal artefacts, scarcely known in the huge archaeological material of the “late Avar period” (eighth to early ninth centuries AD). Unlike in the previous era the majority of the gold and silver objects of the late Avar period are stray finds; in particular high-quality goldsmith's artefacts are absent in the grave assemblages of the eighth century. The significance of precious metal objects in grave assemblages reached its low ebb around the middle of the late Avar period; afterwards not only new object types appeared but a new grave-horizon emerged comprising precious metal objects. This paper, based on the quality and morphology of the objects, their archaeological contexts as well as their spatial distribution, draws a conclusion concerning the social and cultural changes in the early medieval Carpathian Basin.

Microscopic spatial distribution of bound excitons in high-quality ZnO

2004 ◽  
Vol 272 (1-4) ◽  
pp. 785-788 ◽  
Author(s):  
F. Bertram ◽  
D. Forster ◽  
J. Christen ◽  
N. Oleynik ◽  
A. Dadgar ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
High Quality

scholarly journals A Novel Approach to Bridging Physical, Cultural, and Socioeconomic Indicators with Spatial Distributions of Agricultural Heritage Systems (AHS) in China

2020 ◽  
Vol 12 (17) ◽  
pp. 6921
Author(s):  
Guilin Liu ◽  
Domenico M. Doronzo
Keyword(s):  
Spatial Distribution ◽  
Rural Areas ◽  
Land Surface ◽  
Local Governments ◽  
Eastern China ◽  
Agricultural Products ◽  
Western China ◽  
Socioeconomic Indicators ◽  
High Quality ◽  
Clustered Distributions

This paper aimed at analyzing the spatial distribution and variation of agricultural heritage systems (AHSs) in China. In particular, the spatial relationships between AHS sites and influencing factors were analyzed by employing a spatial analysis approach, i.e., solving for cause–effect relations. Then, two reasonable pathways for protecting AHSs were proposed following this methodology. The results showed that the number of AHS sites in eastern China was larger than in western China. This peculiar distribution is thought to be affected by distinctive natural resource endowments and sociocultural traits of local agricultural systems. Indeed, a series of natural, sociocultural, and economic factors were analyzed to reveal their relationships with AHSs. In China, AHS sites have excellent and unique natural conditions, and their clustered distributions positively correlate with the spatial distribution of high-quality agricultural products and the biological abundance index; on the other hand, they negatively correlate with the relief degree of the land surface and GDP. Further results showed that regions with AHSs were mainly located in rural areas of major Chinese cultural zones. In conclusion, two pathways of implementation of high-quality agricultural products and agro-tourism were proposed in order to play an integrated economic, social, and ecological function for protecting AHSs in China. These scientific findings may encourage local governments to protect AHSs and the transition of rural communities.

scholarly journals A Clustering-Based Bubble Method for Generating High-Quality Tetrahedral Meshes of Geological Models

2020 ◽  
Vol 10 (15) ◽  
pp. 5292
Author(s):  
Bowen Wang ◽  
Yingjie Sun ◽  
Nengxiong Xu ◽  
Gang Mei
Keyword(s):  
Spatial Distribution ◽  
Tetrahedral Mesh ◽  
High Quality ◽  
Element Analysis ◽  
Triangulated Surface ◽  
Tetrahedral Meshes ◽  
Node Distribution ◽  
Geological Models ◽  
Point Set ◽  
Surface Meshes

High-quality mesh generation is critical in the finite element analysis of displacements and stabilities of geological bodies. In this paper, we propose a clustering-based bubble method for generating high-quality tetrahedral meshes of geological models. The proposed bubble method is conducted based on the spatial distribution of the point set of given surface meshes using the clustering method. First, the inputted geological models consisting of triangulated surface meshes are divided into several parts based on spatial distribution of point set, which can be used for the determination of the positions and radii of initial bubbles. Second, a procedure based on distance of nearby bubbles is used to obtain the initial size of bubbles. Third, by enforcing the forces acting on bubbles, all bubbles inside the 3D domain reach an equilibrium state by the motion control equations. Finally, the center nodes of the bubbles can form a high-quality node distribution in the domain, and then the required tetrahedral mesh is generated. Comparative benchmarks are presented to demonstrate that the proposed method is capable of generating highly well-shaped tetrahedral meshes of geological models.

Koalas on Kangaroo Island: from introduction to pest status in less than a century

2004 ◽  
Vol 31 (3) ◽  
pp. 267 ◽  
Author(s):  
Pip Masters ◽  
Toni Duka ◽  
Steve Berris ◽  
Graeme Moss
Keyword(s):  
Spatial Distribution ◽  
Population Size ◽  
Population Survey ◽  
Population Control ◽  
Control Program ◽  
Management Program ◽  
Population Estimate ◽  
High Quality ◽  
Pest Status ◽  
Sampling Approach

In less than a century the ecological profile of koalas on Kangaroo Island has shifted from that of a species introduced for conservation purposes to one of pest status. Between 1923 and 1925, 18 koalas were released on Kangaroo Island. Their numbers increased rapidly and in 1997 a population-control program was implemented based on a population estimate of 5000 koalas. During the course of this program, it became clear that the koala population on Kangaroo Island was much greater and more widely distributed than previously thought, hence a more comprehensive population survey was carried out.In 2000–01 the koala population size was calculated using a stratified sampling approach based on five 'catchment units' and three habitat classifications that were known to support koalas. The koala population was estimated to be ~27 000 koalas in 2001. There were substantial differences in koala density in the low-, medium- and high-quality habitat within each catchment unit, and therefore large differences in the spatial distribution of koalas across Kangaroo Island. This revised population estimate has substantial ramifications for the Kangaroo Island Koala Management Program that was set in place in 1997.

scholarly journals Spatial Distribution of Dislocations in Relation to a Substructure in High-Quality GaN Film

2013 ◽  
Vol 19 (S5) ◽  
pp. 127-130
Author(s):  
Mino Yang ◽  
Chong-Don Kim ◽  
Hee-Goo Kim ◽  
Cheol-Woong Yang
Keyword(s):  
Spatial Distribution ◽  
Dislocation Density ◽  
Domain Boundary ◽  
Boundary Structure ◽  
High Quality ◽  
Dislocation Distribution ◽  
Density Of Dislocations ◽  
Domain Boundaries ◽  
Distribution Of Dislocations ◽  
Gan Film

AbstractThe dislocation distribution of high-quality single-crystal gallium nitride (GaN) films grown by the hybrid vapor phase epitaxy was analyzed. This study examined the domain structure of GaN from the dislocation distribution on the macroscale by optical microscopy. The surface structure of GaN consisted of domains with microcolumns as the substructure. The inner domains contained a lower density of dislocations but a large number of these dislocations were observed along the domain boundaries. The existence of a domain boundary structure doubly increased the total dislocation density.

scholarly journals The influence of spatial distribution of producer services on high quality development of manufacturing industry

2021 ◽  
Vol 292 ◽  
pp. 03018
Author(s):  
LiXian Chen ◽  
XinMing Cai ◽  
KaiZhang Zou
Keyword(s):  
Economic Development ◽  
Spatial Distribution ◽  
Manufacturing Industry ◽  
Geographical Location ◽  
Quality Development ◽  
Producer Services ◽  
High Quality ◽  
Development Level ◽  
The Impact

Based on the provincial data of China from 2004 to 2018, this paper empirically tests the impact of the spatial distribution of producer services on the high-quality development of manufacturing. It is found that the spatial distribution of producer services significantly promotes the high-quality development of manufacturing, and there is no heterogeneity of geographical location and economic development level.

scholarly journals Analysis and forecast spatiotemporal distribution of thunderstorms and hail the territory of Belarus

2019 ◽  
pp. 35-45
Author(s):  
Piotr S. Lopukh ◽  
Katsiaryna S. Berazhkova
Keyword(s):  
Spatial Distribution ◽  
Rapid Growth ◽  
Temporal Patterns ◽  
Weather Forecast ◽  
Spatiotemporal Distribution ◽  
High Quality ◽  
Instrumental Data ◽  
Real Mode ◽  
To Receive

The article is devoted to the study of the problem of ensuring the safety of aircraft during take-off and landing. Thunderstorm and hail is one of the most dangerous meteorological phenomena in aviation. To prevent accidents associated with these phenomena, it is necessary to clearly understand the patterns of their occurrence and spatial distribution. In connection with the rapid growth of passenger and cargo traffic, it is necessary to be able to receive and provide actual meteorological information in real mode, as well as to be able to receive high-quality and timely weather forecast. To study the spatial-temporal patterns of the distribution of thunderstorms and hail, Belgidromet’s meteorological instrumental data for 1989–2016 was processed, synoptic maps were analyzed in comparison with calculated forecasts, including WRF, and maps were made using ArcGIS.

scholarly journals High-Quality Economic Development in Huaihe Economic Zone Level Measurement and Evaluation

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xin Sun ◽  
Shu Fang ◽  
Su Zhang
Keyword(s):  
Spatial Distribution ◽  
Time Lag ◽  
Evaluation Index System ◽  
Quality Development ◽  
Huaihe River ◽  
High Quality ◽  
Urban Competitiveness ◽  
Economic Zone ◽  
Development Levels ◽  
The Huaihe River

This article constructs a comprehensive evaluation index system from four aspects: economic vitality, innovation efficiency, green development, and people’s lives. Use the entropy method to comprehensively measure the urban competitiveness level of 25 counties and cities in the economic zone, clarify the differences in their high-quality development levels, and use spatial econometric analysis methods to study the spatial agglomeration and dispersion and spatial convergence of regional urban competitiveness. The results show that the following: (1) the overall high-quality development level of the Huaihe River Eco-Economic Zone is not high, and the overall time and space characteristics is “high in the east and low in the west”; (2) there is a positive spatial autonomy in urban competitiveness and the spatial distribution of the Huaihe River, and relevantly, the degree of closeness of spatial associations between cities is generally low; (3) the gap between the level of urban competitiveness in Jiangsu Province is shrinking, the development of other provinces has a time lag effect, and there are differences in the level of urban competitiveness. Finally, to promote the high-quality development of the Huaihe Economic Zone, we must follow the law of the basin and the characteristics of spatial distribution and implement targeted strategies.

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