scholarly journals Detection of temporal structure depends on spatial structure

1999 ◽  
Vol 39 (18) ◽  
pp. 3033-3048 ◽  
Author(s):  
Sang-Hun Lee ◽  
Randolph Blake
Keyword(s):  
Spatial Structure ◽  
Temporal Structure

scholarly journals DEM Based Study on Shielded Astronomical Solar Radiation and Possible Sunshine Duration under Terrain Influences on Mars by Using Spectral Methods

2021 ◽  
Vol 10 (2) ◽  
pp. 56
Author(s):  
Siwei Lin ◽  
Nan Chen
Keyword(s):  
Solar Radiation ◽  
Spatial Structure ◽  
Sunshine Duration ◽  
Temporal Structure ◽  
Temporal Distribution ◽  
Planetary Science ◽  
Shielding Effect ◽  
Critical Area ◽  
Martian Surface ◽  
Test Region

Solar radiation may be shielded by the terrain relief before reaching the Martian surface, especially over some rugged terrains. Yet, to date, no comprehensive studies on the spatial structure of shielded astronomical solar radiation (SASR) and the possible sunshine duration (PSD) on Mars have been conducted by previous researchers. Previous studies generally ignored the influences of the terrain on the SASR and PSD, which resulted in a corresponding unexplored field on SASR. The purpose of this paper is to study the Martian spatial-temporal structure of SASR and the PSD under terrain influences. In this paper, the theory of Earth’s SASR, the previous Martian SASR model and the theory of planetary science were combined to propose the SASR model that can be applied to Mars. Then, with the spectrum method theory of geography, we defined two new concepts of spectrums to explore the spatial-temporal distribution of SASR and PSD in different Martian landforms. We found SASR and PSD on Mars were significantly influenced by terrain relief and latitude and showed sufficient regularity, which can be concluded as a gradual attenuation with terrain relief and a regularity of latitude anisotropy. The latitude anisotropy feature is a manifestation of the terrain shielding effect. With the latitude varying, SASR and PSD at different temporal scale generally showed different features with those of Earth, which may be attributed to the imbalanced seasons caused by Martian moving orbits and velocity. Compared to PSD, SASR showed more regular variation under terrain relief and was more influenced by the terrain relief which revealed that SASR is more sensitive to terrain relief than PSD. Additionally, the critical area is a quantitative index to reflect the stable spatial structure of SASR and PSD in different landforms and may be viewed as the minimum test region of sample areas. The corresponding result of the experiments herein indicated that either spectrum can effectively depict the spatial-temporal distribution of SASR and PSD on Mars under terrain relief and deepen the understanding of the variation of SASR and PSD influences by terrain. The critical area of either spectrum can be employed to explore and determine the stable spatial structure of SASR and PSD in different landforms. The proposed Martian SASR model and the new spectral method theory shed new light on revealing the spatial-temporal structure of SASR and PSD under terrain influences on Mars.

scholarly journals Structural organization of sacred landscapes

2019 ◽  
Vol 28 (3) ◽  
pp. 487-494 ◽  
Author(s):  
O. Mishchenko
Keyword(s):  
Spatial Structure ◽  
Structural Organization ◽  
System Analysis ◽  
Temporal Structure ◽  
Morphological Structure ◽  
Human Perception ◽  
Sacred Landscape ◽  
Sacred Landscapes ◽  
Anthropogenic Landscape ◽  
Special Respect

The article presents the results of scientific developments concerning the structural organization of sacred landscapes. The methodological basis of the study is the concept of constructive-geographic analysis, which is based on the approaches of the natural and the humanitarian sciences. The system approach to the study of sacred landscapes as a holistic organized territorial structure and a set of methods is used in this work, in particular: structural and logical generalization and system analysis, comparative and geographical, historical and geographical. The author considers the significance of the notion of sacral landscape as being broader than religion per se, and considers it a natural, natural-anthropogenic and anthropogenic system associated with certain symbols of life, myths, significant events, and , indeed ,religious feelings that are of great importance to a person or group of people and requires special respect and protection. The structural organization of all sacred landscapes is characterized  by their properties and spatial structure and is closely connected with their social and functional purpose. As a result, such territorial systems can be divided into: confessional, taphal, active, abnormal. The sacred landscape is characterized by polystructurality, that is, the presence of spatial, temporal and morphological structure. In the spatial structure of the sacral landscape, the following components can be distinguished: the sacred object, anthropogenic and technogenic component, the landscape structure and a person with his/   her spiritual experience. In addition, such a structure has a hierarchical construction, where individual, local, regional, national and global levels can be distinguished. This article presents the peculiarities of the temporal structure of sacral landscapes and outlines the external, internal, and the functioning time. Particular attention is paid to the characteristic of internal time, where one can distinguish the following phases of development: the formation of a natural, natural-anthropogenic or anthropogenic landscape; the creation of a spiritual component; loss of sacred human perception of a natural, natural-anthropogenic or anthropogenic landscape; the disappearance of the natural or natural- anthropogenic landscape. Taking into account the morphological structure of the sacred landscape, it is substantiated that religious objects serving as markers of sacred landscapes cannot correspond to one or another morphological unit of the landscape, that is, completely repeat its outlines and boundaries. However, there is a correlation between the type of landscape and the features of the sacred objects that were formed there.

scholarly journals Characterization of dynamic evolution of the spatio-temporal variation of rain-field in Hong Kong

2015 ◽  
Vol 47 (2) ◽  
pp. 468-482 ◽  
Author(s):  
Peng Liu ◽  
Yeou-Koung Tung
Keyword(s):  
Hong Kong ◽  
Spatial Structure ◽  
Temporal Structure ◽  
Radar Data ◽  
Small Scale ◽  
Large Set ◽  
Time Space ◽  
Main Challenge ◽  
Geostatistical Approach ◽  
Spatio Temporal

A significant part of Hong Kong has hilly terrain with relatively short flow concentration time and, hence, is susceptible to the threat of flash floods and landslides during intense convective thunderstorms and tropical cyclones. For places like Hong Kong, a rainfall model that could adequately capture small-scale temporal and spatial variations would be highly desirable. The main challenge in rain-field modeling is to capture and describe the dynamic time-space evolution of the rainfall during rainstorm events. In this study, radar data with a high spatial (1 km2) and temporal (6 min) resolution of four rainstorm events in Hong Kong are analyzed. A geostatistical approach based on indicator variograms of rain-fields is used. The spatial structure of a rain-field is found to be highly anisotropic and should be adequately considered in the model. Variability of the spatial structure of a rain-field was described well by the main features of the variograms. Moreover, it is possible to identify whether multiple rainstorm centers exist by comparing the mean length and range. In order to establish reliable statistics on the spatial and temporal structure of rain-fields in Hong Kong, this approach could be applied to a large set of rainstorm events in this same region in the future.

scholarly journals Integrating the Eigendecomposition Approach and k-Means Clustering for Inferring Building Functions with Location-Based Social Media Data

2021 ◽  
Vol 10 (12) ◽  
pp. 834
Author(s):  
Feng Gao ◽  
Guanping Huang ◽  
Shaoying Li ◽  
Ziwei Huang ◽  
Lei Chai
Keyword(s):  
Social Media ◽  
Spatial Structure ◽  
Human Activities ◽  
Temporal Structure ◽  
Activity Patterns ◽  
Urban Spatial Structure ◽  
Social Media Data ◽  
Function Identification ◽  
Effective Principal ◽  
Media Data

Understanding the relationship between human activity patterns and urban spatial structure planning is one of the core research topics in urban planning. Since a building is the basic spatial unit of the urban spatial structure, identifying building function types, according to human activities, is essential but challenging. This study presented a novel approach that integrated the eigendecomposition method and k-means clustering for inferring building function types according to location-based social media data, Tencent User Density (TUD) data. The eigendecomposition approach was used to extract the effective principal components (PCs) to characterize the temporal patterns of human activities at building level. This was combined with k-means clustering for building function identification. The proposed method was applied to the study area of Tianhe district, Guangzhou, one of the largest cities in China. The building inference results were verified through the random sampling of AOI data and street views in Baidu Maps. The accuracy for all building clusters exceeded 83.00%. The results indicated that the eigendecomposition approach is effective for revealing the temporal structure inherent in human activities, and the proposed eigendecomposition-k-means clustering approach is reliable for building function identification based on social media data.

scholarly journals Direct N-Body Simulations with a Recursive Center of Mass Reduction and Regularization

1985 ◽  
Vol 113 ◽  
pp. 275-284 ◽  
Author(s):  
J. G. Jernigan
Keyword(s):  
Spatial Structure ◽  
Numerical Method ◽  
Numerical Algorithm ◽  
Temporal Structure ◽  
Center Of Mass ◽  
Core Collapse ◽  
Body System ◽  
Mass Reduction ◽  
The Core ◽  
Force Calculation

We report on an investigation of the core collapse of an initially bound system of 1024 point masses based on a new numerical method which incorporates a recursive center of mass reduction of the N-body system and includes regularization of the two body encounters. A tree which organizes the point masses into a logarithmic hierarchy is the primary feature of the numerical algorithm. The spatial structure of the tree allows for rapid force calculation while the associated temporal structure allows for variable time steps. Simulations are calculated for several core collapse times in an effort to follow the end point evolution of the system. The point-like nature of the interactions are maintained throughout the simulations.

scholarly journals EXTENDED ANALYSIS OF TYPES OF STRIDE PATTERN AND PACING STRATEGY IN 400 M HURDLE RUN

2021 ◽  
Author(s):  
Janusz Iskra ◽  
Marin Ćorluka ◽  
Janez Vodicar ◽  
Krzysztof Maćkała
Keyword(s):  
Spatial Structure ◽  
International Association ◽  
Temporal Structure ◽  
Technical Training ◽  
Temporal Parameters ◽  
Pacing Strategy ◽  
Structure Space ◽  
The World ◽  
Extended Analysis ◽  
Effective Use

The study aims to evaluate the strategy of men’s 400 m hurdles (400 mH) run of the best hurdlers in the world, implementing five types of stride pattern. The analysis included 243 individual runs of 114 leading world hurdlers at a distance of 400 mH, participating in the international championship (39) in 1968-2015. Data was obtained from own sources, published literature, and projects implemented by the IAAF (International Association of Athletics Federations) during the major athletics competitions. The parameters analyzed in the study included the temporal parameters and the spatial structure (space parameters) of 400 mH race. The adopted strategy of the 400 mH run determines significant differences in the temporal structure of the first part of the run and the spatial structure in its second part. Additionally, the differences determining the time strategy in the 400 mH run concern the distance from the first to the fifth hurdle. The number of steps is of particular importance in the second part of the distance, mainly between the 6th and 8th hurdles. The stride patterns determine the course of the competition (pacing strategy) in the 400mH run. In 400 mH training, about 30% time should be devoted to technical training, which will strengthen the effective use of “weaker” lead leg (attacking leg).

Observations of the spatial structure of interstellar hydrogen

1967 ◽  
Vol 31 ◽  
pp. 45-46
Author(s):  
Carl Heiles
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Velocity Dispersion ◽  
Temperature Variations

High-resolution 21-cm line observations in a region aroundlII= 120°,b11= +15°, have revealed four types of structure in the interstellar hydrogen: a smooth background, large sheets of density 2 atoms cm-3, clouds occurring mostly in groups, and ‘Cloudlets’ of a few solar masses and a few parsecs in size; the velocity dispersion in the Cloudlets is only 1 km/sec. Strong temperature variations in the gas are in evidence.

Results of Spatial Structure of Atmosphere Radiation in a Spectral Range (1.5–2) µm Research

2018 ◽  
pp. 7-13
Author(s):  
Anton M. Mishchenko ◽  
Sergei S. Rachkovsky ◽  
Vladimir A. Smolin ◽  
Igor V . Yakimenko
Keyword(s):  
Spatial Structure ◽  
Unmanned Aerial Vehicle ◽  
Wavelength Range ◽  
Spectral Range ◽  
Near Ir ◽  
Optoelectronic Systems ◽  
Aerial Vehicle

Results of experimental studying radiation spatial structure of atmosphere background nonuniformities and of an unmanned aerial vehicle being the detection object are presented. The question on a possibility of its detection using optoelectronic systems against the background of a cloudy field in the near IR wavelength range is also considered.

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