scholarly journals Analysis of morphometric data for drainage basins in Hafr Al Batin city, northeast of Saudi Arabia using GIS: تحليل المعطيات المورفومترية لأحواض التصريف بمدينة حفر الباطن - شمال شرق المملكة العربية السعودية باستخدام نظم المعلومات الجغرافية (GIS)

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Nawaf bin Hamed Al-Buhaithi
Keyword(s):  
Morphometric Data ◽  
Unit Hydrograph ◽  
Drainage Basins ◽  
Dimensionless Unit ◽  
Matrix Properties ◽  
The Matrix ◽  
Arc Gis ◽  
Morphological Variables ◽  
The City ◽  
Geomorphological Analysis

This study provides a geomorphological analysis of the properties of the valleys of the city of Hafr al-Batin using Geographic information systems (GIS) techniques that helped extract the parametric properties and the matrix properties used in the application of the SCS dimensionless Unit hydrograph to calculate the flow Peak of each valley. The results of the application of this model have shown that Seoul's studied valleys flow during periods varying from one water basin to another between 4.38 hours in the basin (1) F 26.44 hour in the tub (9) and at a size between 30.00 M 3/sec (1) F 257.58 M 3/sec in pelvis (10), and at speeds of between 1.50 m/sec (2) F (5 (f 2.37 m/sec in Basin (9)). The spatial analysis outputs of ARC GIS also assisted in the extraction of 12 morphological variables and 11 variable scales, which helped to classify studied streams by every variable.

Effect of Laser Pre-Treatment on the Machining Performance of Aluminum/SiC MMC

2003 ◽  
Vol 125 (4) ◽  
pp. 378-384 ◽  
Author(s):  
Stuart Barnes ◽  
Richard Morgan ◽  
Andrew Skeen
Keyword(s):  
Tool Wear ◽  
Wear Mechanism ◽  
Laser Heating ◽  
Surface Damage ◽  
Edge Condition ◽  
Machining Performance ◽  
Matrix Properties ◽  
The Matrix ◽  
Pre Treatment ◽  
Measuring Tool

Although the abrasive reinforcement in MMCs primarily controls their machining behavior, the properties of the matrix also exert an influence. A 1200 W diode laser was used, due to the large footprint (5×0.3 mm) and the short wavelength (0.94 μm) to pre-treat a 2618 (18% SiC) alloy. The laser heating and self-quenching of the material modified the matrix properties. Machining performance was then assessed by measuring tool wear and edge condition, cutting forces, surface finish, and sub-surface damage. Results indicated that pre-treatment gave less wear, lower forces, and less sub-surface damage although abrasion remained the primary wear mechanism.

scholarly journals Distribution of hospitals through Baghdad province using Geographic Information System

2021 ◽  
Vol 1 (137) ◽  
pp. 73-80
Author(s):  
Zahraa Najim
Keyword(s):  
Information System ◽  
Geographic Information System ◽  
Research Study ◽  
Geographic Information ◽  
Arc Gis ◽  
The City

This research study the distribution of hospitals in the province of Baghdad Using geographic information system to focus on the shortage of hospitals in specific regions in comparison with other regions. In the distribution of hospitals in the city of Baghdad using Arc GIS program, we noticed that there is a shortage in the number of hospitals in the city of Kadhimiya, Sadr city and other areas compared to the increase in the population in these areas. There are enough hospitals in the area of Andalus square.

scholarly journals Cyanate Ester Resin/Silica subnanocomposites and their superiority over nanocomposites due to fundamental role of constrained interfacial dynamics

2021 ◽  
Vol 2103 (1) ◽  
pp. 012100
Author(s):  
V A Bershtein ◽  
A M Fainleib ◽  
D A Kirilenko ◽  
P N Yakushev
Keyword(s):  
Positive Impact ◽  
Sol Gel ◽  
Cyanate Ester ◽  
Interfacial Dynamics ◽  
Cyanate Ester Resin ◽  
Sol Gel Process ◽  
Matrix Properties ◽  
Interfacial Areas ◽  
The Matrix

Abstract The study of nanostructure, thermal and relaxation properties (by HAADF-STEM, EDXS, DMA and DSC), combined with the calculations of interparticle distances and interfacial areas, has been performed for a series of the hybrid Cyanate Ester Resin (CER)/Si02 polymer composites with 0.01 to 10 wt.% Si02 units introduced via a sol-gel process. The absence of clusterization, arising only subnanometric Si02 nodes and their quasi-regular distribution within the amorphous matrix, with the shortest distances between nodes, provided their exceptional positive impact on the matrix properties at ultra-low Si02 contents of 0.03-0.1 wt.%. The superiority of these subnanocomposites over the nanocomposites was determined by the role of constrained interfacial dynamics over the whole matrix.

scholarly journals Votive altars: domestic signals to inhabit the Sacred

2019 ◽  
Vol 2 (3) ◽  
pp. 31
Author(s):  
Claudio Gambardella ◽  
Valentina Sapio
Keyword(s):  
Visual Arts ◽  
Word Meaning ◽  
Living Space ◽  
Mediterranean Countries ◽  
Catholic Religion ◽  
The Matrix ◽  
Human World ◽  
The Mediterranean ◽  
The City ◽  
Over Time

“Sacred” is an Indo-European word meaning “separate”. The Sacred, therefore, [. . . is] a quality that is inherent in that which has relation and contact with powers that man, not being able to dominate, perceives as superior to himself, and as such attributable to a dimension [. . . ] thought however as ”separate” and ”other” with respect to the human world » Galimberti, (2000). The so-called votive altar, autonomous or attached to a major building often present in the Mediterranean countries, belong to the dimension of the Sacred.Votive altars - present in an old neighborhood of peasant origin in the suburbs of Naples called Ponticelli - are almost always placed in the interstices between street and courtyard (a self-built residential typology modeled over time by the inhabitants and which often forms the matrix of many neighborhoods popular Neapolitan). They keep and exhibit little sculptures and drawings of Jesus, Madonnas, and Saints of the Catholic religion, mixed with ancestors portraits and photos of relatives dead of the inhabitants, drawing on the ancient domestic cult of the Romans of Lari and Penati; it is certainly not a consciously cultured reference, but a mysterious ”feeling” that is common among primitive and popular cultures and that unravels through the centuries unscathed. Placed at the entrance of the living space, the altar expresses the sign of a difference, of a territorial change, separates ”ours” from ”yours”, welcomes, does not reject, but marks an open and inclusive threshold.With the paper, we want to study this phenomenon of ”primitive” culture and not regulated by laws, a mix of diffuse sacredness and popular magic, deepening the ”design” aspects of it, building an abacus in which to highlight potential and free references to the visual arts of these ”design works without designers”, and finding out new signs of the Sacred in the City in our time.

Reconciling the Animal and the City in Photography

2019 ◽  
pp. 174-192
Author(s):  
Youngjune Lee
Keyword(s):  
South Korean ◽  
The Past ◽  
The Matrix ◽  
The City

By carefully analyzing South Korean photographer Kim Kichan's works on the ordinary people's lives in the streets of Seoul in the 1970s, this chapter problematizes two photographic ideologies that have informed South Korea's anticolonial minjung nationalism: photography as a truthful record of reality and as a nostalgic emblem of the past. Instead of indexing such notions of linear history, this chapter treats Kim Kichan's works as the interfaces located among diverse forces and elements in the matrix of history that far exceed the nationalist horizon of minjung imaginary. More specifically, Kim Kichan's photographs foreground the three-partite relationship ofhuman-animal-environment in narrow streets, providing a significant axis around which the very notion of the human and its agency are redefined.

scholarly journals Lack of Spatial Approach in Urban Density Policies: The Case of the Master Plan of Tehran

2020 ◽  
Vol 12 (18) ◽  
pp. 7285
Author(s):  
Mostafa Ghadami ◽  
Andreas Dittmann ◽  
Taher Safarrad
Keyword(s):  
Spatial Structure ◽  
Statistical Tests ◽  
Area Ratio ◽  
Master Plan ◽  
Urban Spatial Structure ◽  
Floor Area Ratio ◽  
Spatial Approach ◽  
Arc Gis ◽  
Geographic Weighted Regression ◽  
The City

This paper aims to investigate the approach of density policies in the Tehran Master Plan and the consequences of ignoring the macro spatial scale in density policymaking. In this study, the floor area ratio (FAR) regulations of the Master Plan of Tehran (which are defined by specific land use zones) are used as one of the main densification tools. Then, employing the Getis–Ord Local G and geographic weighted regression (GWR) statistical tests, Arc GIS 10.3 software, and population and employment variables, the spatial outcomes of the Master Plan density policies were modeled. In this research, both population and employment (job) variables and their relationship were utilized to depict the urban spatial structure of the city. The model will show the resulting spatial structure of Tehran if the densification policies of the plan are realized. The findings of the research are surprising, as they indicate that the Master Plan’s densification policies would worsen the current spatial structure by disrupting the current population and employment spatial structure and neglecting their logical relationships. In fact, the Master Plan would change the current polycentric structure into a highly dispersed structure due to its densification approach, which is mainly based on the neighborhood micro scale.

scholarly journals Urbanisation Footprints and the Distribution of Air Quality in Nairobi City, Kenya

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Maurice O Oyugi
Keyword(s):  
Air Quality ◽  
Correlation Coefficients ◽  
Target Population ◽  
Urban Morphology ◽  
Morphological Parameter ◽  
Land Uses ◽  
Morphological Variables ◽  
The Relationship ◽  
The City ◽  
Morphological Variable

Various postulations on the relationship between urban morphology and air quality are qualitative. This fails to establish the strength of the contributions of each morphological parameter in the spatial distribution of the air quality. It is this gap in knowledge that this study sought to fill by modelling the correlation existing between the urban morphological variables of development density, land uses, biomass index and air quality values of Nairobi city. While 30 development zones of the city constituted the target population, IKONOS satellite imagery of the city for the year 2015 was utilised in establishing the development densities, land uses and biomass index. The parameters were transformed into numerical surrogates ranging from 1 to 10 with lower values accorded to zones with low biomass index, the highest development density, noxious land uses, high gaseous concentrations and vice-versa. Pearson’s correlation coefficients (r), coefficients of determination (R), t-tests and the Analysis of Variance (F-tests) with levels of significance being 95% were used to determine the strengths, significances and consistencies of the established relationships. The study established that development density is the most significant morphological variable influencing the distribution of air quality. This is followed by biomass index and to a weaker extent, land uses.

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