Kinds Of Distribution Patterns Research Articles

Pattern of spatio-temporal variability of extreme precipitation and flood-waterlogging process in Hanjiang River basin

Based on the uniform distributed rainfall data in the Hanjiang River basin, the characteristics of spatio-temporal variability of extreme precipitation and flood-waterlogging process are diagnosed in terms of index definition and mathematical statistics. The study found that: (1) no significant trends of extreme rainfall for the entire basin were tested, but there was a jump variation in 1990s from abundance to dryness, accompanied by 20-year main periodic oscillation. Since 2000, the frequency of extremely heavy rain has increased significantly. (2) there is a spatial distribution pattern of lower in the northeast and higher in the southwest, and decreasing from upstream to downstream in the annual means of extreme precipitation. High-value centers are concentrated in the southwestern mountainous areas and the plains in the downstream, which are prone to form the distribution pattern of Central-North Radiation Type and Southeast-Northwest Type. (3) basin usually suffers 5–6 waterlogging processes per year, most of which were light or moderate grade, lasting 2–4 days. Since 2000, the flood-waterlogging process has shown evolution characteristics in increasing of the intensity, frequency, duration, and fluctuation, having strong continuity in the future. (4) affecting by climate and topography, spatial distribution of flood-waterlogging is uneven. Downstream and southwest of upstream are regularly the high-value centers, which are easy to form three kinds of distribution patterns, namely Northeast Radiation Type, Middle-lower Radiation Type and Middle-upper Radiation Type. Since the 21st century, the Hanzhong area and the watershed below Xiangyang both often encountered flood-waterlogging processes of high-intensity, long-duration, and high-frequency, which easy to induce flood disasters. Spatio-temporal variability of extreme precipitation and flood-waterlogging is a direct result of the rational development and utilization of water resources. We expect the results here to provide a deep insight into flood-waterlogging and serve as a reference for the watershed flood disaster response, rain-flood utilization, and optimal allocation of water resources.

Megalithic culture at the Suco Lor site Bondowoso

This research examines the megalithic culture at the Suco Lor Site, Bondowoso. The research objectives were: (i) to make an inventory of the number of archaeological remains of megalithic culture in the Suco Lor Site; (ii) analyzing the distribution, types, and functions of the archaeological remains of megalithic culture; (iii) reconstructing a picture of the religious, social and economic life of the supporting megalithic community. The research design used a historical research design with a cultural archeology approach. Primary data were collected using field survey techniques; Secondary data were collected using interview techniques and documentary techniques. The interpretation of the data was carried out hermeneutically using form analysis techniques, context analysis, comparisons, and ethnoarcheological analogies. The results of the study are as follows. First, the number of megalithic cultural archaeological remains at the Suco Lor Site is 241 with a typology consisting of 11 types. Second, there are two kinds of distribution patterns (group close together and single distribution). Third, the megalithic community in the Suco Lor Site has recognized religion which is oriented towards the cult of ancestors. Their social life has recognized the pattern of permanent housing in complex social life arrangements, which are also egalitarian in character. They are familiar with and master various technologies (pottery making, stone mining, and carving) and are thought to have been able to utilize metal technology. The subsistence pattern relies on agriculture as the main subsistence, as well as mixing food, trade and (presumably) livestock as supporting subsistence.

Megalithic Culture at the Maskuning Kulon Site Pujer Bondowoso

This study examines the megalithic culture at the MaskuningKulon Site, Bondowoso. This site is one of the megalithic sites located in MaskuningKulon Village, Pujer District, Bondowoso Regency. The research objectives were: (i) to make an inventory of the number of archaeological remains of megalithic culture at the Maskuning Kulon Site; (ii) analyzing the distribution, types and functions of the archaeological remains of the megalithic culture; (iii) reconstructing a picture of the religious life/belief system, social, and economy of the supporting communities. This research design uses historical research design with cultural archeology approach. Primary data were collected using field survey techniques; Secondary data were collected using interview techniques and documentary techniques. The interpretation of the data was carried out hermeneutically using form analysis techniques, context analysis, comparisons, and ethnoarchaeological analogies. The results of the study are as follows. First, the total number of megalithic cultural archaeological remains found at the MaskuningKulon Site is 58. Second, there are two kinds of distribution patterns (group close together and single distribution). Typology consists of 1 type. Third, the megalithic community at the Maskuning Kulon site has recognized religion which is oriented towards ancestor worship.Their social life is confirmed to have recognized the pattern of permanent housing in complex social life arrangements: differentiated and stratified, as well as egalitarian in character. They already know and master the technique of making pottery. The subsistence pattern relies on agriculture as the main subsistence, as well as gathering food, trade and it is suspected that agriculture is the supporting subsidence.

Numerical simulations of development of snowdrifts on long-span spherical roofs

This study aims to provide a multiphase approach that could better consider the snow drifting development on a building roof and then apply it to the investigation of the snowdrift development on a long-span spherical roof. Firstly, the CFD prediction accuracy for the flow field and the snowdrift on a two-level step building is examined by comparing simulated results with that of a field measurement. The windward snowdrift caused by building's blocking effect and trajectories of snow particles under the action of aerodynamic force and gravity are both well reproduced by incorporating an additional source term and a slip term into the transport equations. Secondly, the prediction accuracy of the snowdrift formed on a spherical roof is confirmed through the comparison with a wind tunnel test. The snow slipping effect at the edge of the roof is also well reproduced by considering the angle of repose of the snow. Based the validated approach, the snowdrift characteristics on a long-span spherical roof are investigated under different inflow velocity conditions. Three kinds of distribution patterns, i.e., the full-span balanced distribution, half-span unbalanced distribution and transitional distribution between them, are observed. Furthermore, the predicted results correspond well with the resultant design codes developed by ISO 4355. Finally, the size effect of the building roof on snowdrifts is explored by simulating the snowdrift on the spherical roofs with different spans. It is found that the spherical roof would have to bear a larger snow load with the increasing roof span, namely, the long-span spherical roof has more risks due to the adverse snow load.

Chaotic dynamics of a non-autonomous nonlinear system for a smart composite shell subjected to the hygro-thermal environment

In this research, nonlinear dynamic behaviors of multiscale composites doubly curved shells have been investigated by employing multiple scales Perturbation Method. Three-phase composites shells with polymer/Carbon nanotube/fiber (PCF) according to Halpin–Tsai model have been assumed. The displacement- strain of nonlinear vibration of multiscale laminated doubly curved shells via higher order shear deformation (HSDT) theory and using Green–Lagrange nonlinear shell theory is obtained. The governing equations of composite doubly curved shell have been derived by implementing Hamilton’s principle and shell considered to be simply supported. For investigating correctness and accuracy, this paper is validated by other previous researches. Finally, bifurcation diagram, phase portraits and Poincare maps are investigated. The results indicate different dimensionless force; curvature ratio and kind of distribution pattern have strong influence on nonlinear vibration control of the composite multiscale doubly curved shell.

Hydrocarbon Distribution Pattern in the Upper Ordovician Carbonate Reservoirs and its Main Controlling Factors in the West Part of Northern Slope of Central Tarim Basin, NW China

The northern slope of Tazhong palaeo-uplift has become a key target field for petroleum exploration in Tarim Basin. A major breakthrough is made in the Upper Ordovician oil and gas exploration in the west part of northern slope. Oil and gas near the Tazhong I slope-break zone occurred in Liang2 section was dominated by condensate gas reservoir, while oil reservoir was mainly inward distributed in Liang3 section. The crude oils in this region in physical properties characterized by low density, low viscosity, low freezing point, low sulfur content, medium wax content. And the natural gas in chemical components was featured by low-medium nitrogen content, low-medium carbon dioxide content and medium-high hydrogen sulfide content. In the plane direction, oil and gas exhibited a “oil in the interior, gas in the exterior” distribution pattern, and mainly located in a depth range of 0∼60 m below the top of the Liang3 section in the longitudinal direction. The distribution patterns displayed in physical properties and chemical compositions of oil and gas are controlled by multiple influencing factors. The results of above comprehensive studies suggested that vertical overriding of reef-bank-type reservoirs in Liang2 section and karst reservoirs in Liang3 section provided superior reservoir conditions; faults and fractures not only formed reservoir space and improved reservoir quality, also promoted the development of karst reservoirs and provided good migration pathway for hydrocarbon accumulation; one of the nonnegligible factors leading to this kind of distribution pattern for the Upper Ordovician oil and gas reservoirs is shale content in the compact carbonate formation; multi-sources and multi-stages of hydrocarbon filling are absolutely necessary controlling factor for this kind of distribution pattern in the whole block.

Putting placozoans on the (phylogeographic) map

[Extract] The Phylum Placozoa, once considered monotypic, turns out to be surprisingly diverse despite the morphological simplicity and apparent uniformity of these small and often overlooked animals. A paper by Eitel & Schierwater (2010) in this issue of Molecular Ecology, based on a world-wide collecting program, greatly increases our knowledge of the distribution of specific placozoan haplotypes, more than doubles the number of genetically characterized sites, and reports the first genetic data for isolates from the Eastern Atlantic and Indian Ocean. This paper is also important in that it marks an early attempt to map haplotypes with different kinds of distribution patterns.

Mineral resource analysis by parabolic fractals

Elemental concentration distributions in space have been analyzed using different approaches. These analyses are of great significance for the quantitative characterization of various kinds of distribution patterns. Fractal and multi-fractal methods have been extensively applied to this topic. Traditionally, approximately linear-fractal laws have been regarded as useful tools for characterizing the self-similarities of element concentrations. But, in nature, it is not always easy to find perfect linear fractal laws. In this paper the parabolic fractal model is used. First a two dimensional multiplicative multi-fractal cascade model is used to study the concentration patterns. The results show the parabolic fractal (PF) properties of the concentrations and the validity of non-linear fractal analysis. By dividing the studied area into four sub-areas it was possible to show that each part follows a non-linear parabolic fractal law and that the dispersion within each part varies. The ratio of the polynomial coefficients of the fitted parabolic curves can reflect, to some degree, the relative concentration and dispersal distribution patterns. This can provide new insight into the ore-forming potential in space. The parabolic fractal evaluations of ore-forming potential for the four subareas are in good agreement with field investigation work and geochemical mapping results based on analysis of the original data.

Distribution Patterns of Pentacyclic Triterpenoid Hydrocarbons in Low‐Mature Source Rocks from Eastern China

Abstract: Four typical distribution patterns of pentacyclic triterpenoid hydrocarbons (types A‐D) are distinguished in the low‐mature source rocks from eastern China. Type A has a relatively high content of pentacyclic triterpenes. It exists in immature sediments and the distribution and abundance of triterpenes vary with the maturity of the sediments. An unknown C30 triterpene (UCT2) has also been detected in very shallow sediments. This compound is very unstable and disappears rapidly with the increase of depth. Type B is characterized by a relatively high amount of 17α(H), 21β(H)‐30‐homohopane. This kind of distribution pattern is common in coals and terrestrial sediments of low maturity. Type C has a relatively high content of diahopane and neohopane series. The analysis shows that this distribution pattern may have an indirect relationship with the input of higher plants despite its microbial source. There are C30—unconfirmed triterpane (UCT2) and a relatively high content of C35 hopane in type D. The distribution patterns of pentacyclic triterpenoids are varied under influences of biological sources, diagentic and sedimentary environments, thermal maturity etc. Therefore, they can provide useful information about the source rocks. Based on geochemical characteristics of the source rocks, the authors postulated that the type B and type C patterns are mainly related to suboxic‐anoxic environments. Type D indicates the reducing to anoxic environment, in which C30‐UCT3 may be related to some specific biological source in saline environments. The precursors and thermal evolution of some triterpenoid hydrocarbons are also discussed herein.

Longitudinal distribution of trace elements in the atmosphere of an industrial area from neutron activation analysis

Industrial units play a significant role in atmospheric pollution. Industrial exhausts deteriorate the atmospheric quality causing unhygienic environment for the people working in the vicinity. This work presents a study of the longitudinal distribution of trace elements of the Sheikhupura industrial area. Three kinds of distribution patterns were observed and are discussed in detail. The results are based on the neutron activation analysis of 16 trace elements.