scholarly journals Non-traditional Oils: Analysis of Regional Distribution and Reserves of Heavy Oil and Natural Bitumen

2020 ◽  
Vol 6 (7) ◽  
pp. 226-234 ◽  
Author(s):  
T. Yarboboev ◽  
Sh. Sultanov ◽  
F. Aminov ◽  
D. Navotova
Keyword(s):  
Spatial Distribution ◽  
Heavy Oil ◽  
Regional Distribution ◽  
Oil Industry ◽  
Distribution Patterns ◽  
Natural Bitumen ◽  
Heavy Oils

The spatial distribution of heavy oils and natural bitumen’s depending on their reserves is analyzed. It is shown that due to the deterioration of the structure of the reserve in the direction of increasing the share of hard-to-recover oils, the role of heavy oils and natural bitumen’s in the overall hydrocarbon balance increases. Analysis of reserves showed that most of their world reserves are concentrated in Canada, Venezuela, and Russia. The results of studies of the distribution patterns of heavy oils and natural bitumen’s can be used in improving methods of field search and in solving other problems of the oil industry.

scholarly journals Spatial Distribution of Picophytoplankton in Southeastern Coast of Peninsular Malaysia Using Flow Cytometry

2021 ◽  
Vol 29 (3) ◽  
Author(s):  
Roswati Md Amin ◽  
Md Suffian Idris ◽  
Nurul Asmera Mudiman ◽  
Noor Hazwani Mohd Azmi ◽  
Hing Lee Siang
Keyword(s):  
Flow Cytometry ◽  
Spatial Distribution ◽  
Distribution Patterns ◽  
Southwest Monsoon ◽  
Peninsular Malaysia ◽  
Percentage Contribution ◽  
Southeastern Coast ◽  
Ocean Productivity ◽  
The Impact

The distribution of picocyanobacteria from two genera, Synechococcus and Prochlorococcus, and picoeukaryotes in surface water (0.5 m) was investigated by flow cytometry in the southeastern coast of Peninsular Malaysia during the Southwest monsoon in August 2014. During the cruise, Synechococcus cells were predominant throughout the study area, contributing as much as 50% to the total picophytoplankton population, whereas picoeukaryotes and Prochlorococcus constituted only 31% and 19% of the population, respectively. Spatially, Synechococcus and picoeukaryotes were more dominant in coastal waters, while Prochlorococcus appeared to be more highly abundant in offshore waters. Furthermore, the percentage contribution of each population to total picophytoplankton also exhibited different spatial distribution patterns along a coastal-offshore gradient. The percentage contribution of Synechococcus was spatially constant throughout the study area, while the fraction contributed by picoeukaryotes showed a reduced contribution from coastal to offshore waters. In contrast, Prochlorococcus exhibited an increased proportion to total picophytoplankton across a coastal-offshore gradient, suggesting the increasing importance of this population in offshore waters of the study area. As revealed by Canonical Correlation Analysis, the abundance of Synechococcus and picoeukaryotes increased significantly with reducing dissolved oxygen levels and pH, and with increasing total chlorophyll. In contrast, temperature was the only factor influencing the abundance of Prochlorococcus significantly increased with decreasing water temperature in the study area. Overall, results of the present study provide valuable information on the role of regional environmental factors in the distribution and dominance of picophytoplankton communities that are not only critical for the ocean productivity but also the impact on the carbon cycle in the study area.

scholarly journals The role of root buds in the regeneration of Casearia sylvestris Swartz (Salicaceae) in the cerrado, São Carlos, São Paulo state, Brazil

Hoehnea ◽  
2014 ◽  
Vol 41 (3) ◽  
pp. 345-352 ◽  
Author(s):  
Maristela Imatomi ◽  
João Paulo Souza ◽  
Sonia Cristina Juliano Gualtieri ◽  
Alfredo Gui Ferreira
Keyword(s):  
Spatial Distribution ◽  
Distribution Patterns ◽  
Fire Effects ◽  
Size Class ◽  
Paulo State ◽  
Casearia Sylvestris ◽  
Underground System ◽  
Burnt Areas ◽  
Root Buds

The present work describes the fire effects on the population structure of Casearia sylvestris Swartz (Salicaceae). Diameter and height structure as well as spatial distribution patterns of the root sprouts were analyzed pre- and post-fire. The morphology and anatomy of the underground system were also analyzed in order to investigate the nature and origin of sprouts from this system. In this study, a 10-ha of Cerrado area was sampled from February to November 2006; in August, a fire burned roughly 80% of the study area, allowing us to compare the data collected pre- and post-fire. Our findings show that the underground systems consisted of specialized roots and buds originated close to the vascular cambium. The spatial distribution of the root sprouts became clustered pre- and post-fire and most of the root sprouts were concentrated in the first size class, indicating that the sprouts from roots play an important role in the recovery of this species in burnt areas.

Role of mycorrhizal associations in tree spatial distribution patterns based on size class in an old-growth forest

Oecologia ◽  
2019 ◽  
Vol 189 (4) ◽  
pp. 971-980 ◽  
Author(s):  
T. Sasaki ◽  
M. Konno ◽  
Y. Hasegawa ◽  
A. Imaji ◽  
M. Terabaru ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Distribution Patterns ◽  
Size Class ◽  
Old Growth ◽  
Spatial Distribution Patterns ◽  
Old Growth Forest ◽  
Mycorrhizal Associations

Modeling spatial distribution of the unionid mussels and the core-satellite hypothesis

1998 ◽  
Vol 38 (7) ◽  
pp. 73-79 ◽  
Author(s):  
Hooi-Ling Lee ◽  
Donald DeAngelis ◽  
Hock-Lye Koh
Keyword(s):  
Spatial Distribution ◽  
Life Cycle ◽  
Success Rate ◽  
Distribution Patterns ◽  
Fish Host ◽  
Limited Movement ◽  
Unionid Mussels ◽  
Species Characteristics ◽  
Major Factors ◽  
Fish Hosts

This paper discusses the spatial distribution patterns of the various species of the Unionid mussels as functions of their respective life-cycle characteristics. Computer simulations identify two life-cycle characteristics as major factors governing the abundance of a species, namely the movement range of their fish hosts and the success rate of the parasitic larval glochidia in finding fish hosts. Core mussels species have fish hosts with large movement range to disperse the parasitic larval glochidia to achieve high levels of abundance. Species associated with fish host of limited movement range require high success rate of finding fish host to achieve at least an intermediate level of abundance. Species with low success rate of finding fish hosts coupled with fish hosts having limited movement range exhibit satellite species characteristics, namely rare in numbers and sparse in distributions.

The role of gas flow distributions on CO2 mineralization within monolithic cemented composites: coupled CFD-factorial design approach

2021 ◽  
Author(s):  
Iman Mehdipour ◽  
Gabriel Falzone ◽  
Dale Prentice ◽  
Narayanan Neithalath ◽  
Dante Simonetti ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Factorial Design ◽  
Material Properties ◽  
Gas Flow ◽  
Design Approach ◽  
Processing Conditions ◽  
Gas Processing ◽  
Co2 Mineralization

Optimizing the spatial distribution of contacting gas and the gas processing conditions enhances CO2 mineralization reactions and material properties of carbonate-cementitious monoliths.

scholarly journals Spatio-temporal distribution patterns of Plutella xylostella (Lepidoptera: Plutellidae) in a fine-scale agricultural landscape based on geostatistical analysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jian-Yu Li ◽  
Yan-Ting Chen ◽  
Meng-Zhu Shi ◽  
Jian-Wei Li ◽  
Rui-Bin Xu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Plutella Xylostella ◽  
Agricultural Landscape ◽  
Seasonal Pattern ◽  
Distribution Patterns ◽  
Geostatistical Analysis ◽  
Distribution Model ◽  
Detailed Knowledge ◽  
Fine Scale ◽  
Spatio Temporal

AbstractA detailed knowledge on the spatial distribution of pests is crucial for predicting population outbreaks or developing control strategies and sustainable management plans. The diamondback moth, Plutella xylostella, is one of the most destructive pests of cruciferous crops worldwide. Despite the abundant research on the species’s ecology, little is known about the spatio-temporal pattern of P. xylostella in an agricultural landscape. Therefore, in this study, the spatial distribution of P. xylostella was characterized to assess the effect of landscape elements in a fine-scale agricultural landscape by geostatistical analysis. The P. xylostella adults captured by pheromone-baited traps showed a seasonal pattern of population fluctuation from October 2015 to September 2017, with a marked peak in spring, suggesting that mild temperatures, 15–25 °C, are favorable for P. xylostella. Geostatistics (GS) correlograms fitted with spherical and Gaussian models showed an aggregated distribution in 21 of the 47 cases interpolation contour maps. This result highlighted that spatial distribution of P. xylostella was not limited to the Brassica vegetable field, but presence was the highest there. Nevertheless, population aggregations also showed a seasonal variation associated with the growing stage of host plants. GS model analysis showed higher abundances in cruciferous fields than in any other patches of the landscape, indicating a strong host plant dependency. We demonstrate that Brassica vegetables distribution and growth stage, have dominant impacts on the spatial distribution of P. xylostella in a fine-scale landscape. This work clarified the spatio-temporal dynamic and distribution patterns of P. xylostella in an agricultural landscape, and the distribution model developed by geostatistical analysis can provide a scientific basis for precise targeting and localized control of P. xylostella.

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