doi:10.1088/1757-899X/1090/1/012070

Details

Publication Date

Mon Mar 01 2021

Journal Name

Iop Conference Series: Materials Science And Engineering

Volume

1090

DOI

10.1088/1757-899X/1090/1/012070

Choose Citation Style

Statistics

View publication

2

Statistics

(2)

Structural Design According to Constructal Theory in Architecture

Constructal theory

Structural design

structural efficiency

Architectural form

material

Aseel Abdulhaleem

Bahjat Rashad

...Show More Authors

Abstract<p>Constructal theory plays a major role in the conceptual design stage of the structural system in architecture. It provides a conceptual framework for predicting the form depending on natural systems to model those systems geometrically according to the constructal law that works in two directions: the first is towards predicting the general form of the structural system, and the second is the physical application of the law in the process of detailed design of the parts of the system. The aim of this paper is to determine the mechanism adopted in the structural design according to the constructal theory, assuming that the structural design according to the constructal theory achieves high structural efficiency. The paper depends in its theoretical framework on the clarification of the concepts of constructal theory, the mechanism of constructal law work, and then the verification of its compliance with the applicable rules to achieve high efficiency. The paper concludes a set of indicators that can be adopted in assessing the level of structural efficiency - at the level of form and material - of architecturally designed structures according to the constructal theory. The research concluded that constructal theory contributes significantly to research on the origins of living systems, and to employ them in the process of creating the architectural form on one hand, and enhancing the structural efficiency of the structural performance on the other hand.</p>

View Publication Preview PDF

Quick Preview PDF

Publication Date

Wed Jan 01 2020

Journal Name

Technologies And Materials For Renewable Energy, Environment And Sustainability: Tmrees20

Change detection of the land cover for three decades using remote sensing data and geographic information system

The changes in the land cover using geographical information systems and remote sensing techniques for the period (1990 - 2019) for part of the Baghdad governorate in central Iraq are detected and monitored. In this research

four satellite scenes with different sensors were used the TM

ETM+

and OLI

which were obtained by Landsat-5

Landsat-7 and Landsat-8 satellites

respectively. Maximum likelihood method supervised classification is adopted as the main classifier to distinguish different land cover types in the study region. The results showed that there are ten different classes in the values of their reflectance. This study proved that any landcover of the earth’s surface can be studied and determined by its spectral characteristics. The change for each class of the land cover for the study area was determined within the study period. The results of the study confirmed the possibility of identifying the types of land cover and finding the percentage of changes that occur in it and detecting it with high efficiency using the remote sensing technique.

Muna Aref

Amal Jabbar

...Show More Authors

View Publication

(3)

Publication Date

Mon Apr 06 2020

Journal Name

August

INFLUENCE OF SOME FACTOR ON SOMATIC EMBRYOS INDUCTION AND GERMINATION OF DATE PALM CV BARHI BY USING CELL SUSPENSION CULTURE TECHNIQUE

This study was done to examine different concentrations of mercuric chloride (Hgcl2) for Explants sterilization and different concentration of NAA) mg/L with 2iP for their effect on initiation primary callus and subsequent embryogenesis in Phoenix dactyliferae cultivar Barhi. Leaf primordial and shoot tips were excised from 2-3 years old offshoot. The result showed that contamination percentage decreased with an increase in concentration of Hgcl2 for two explants where in the control (0.0)% gave highest value 75% and 62.5% of contamination for leaf primordial and shoot tip respectively while the addition (0.1)% gave a significant decrease 37.5 and 0% for explants respectively. The Explants were inoculated onto Murashiege and Skoog

1962 (MS) medium supplemented with 2iP 3mg/L and containing 0

25

50 or 100 mg/L of NAA

the addition (50) mg/L of NAA gave highest value 68.8% in percentage of callus initiation with significant difference from addition 0% gave lowest value (18.8)%

as well Explants of shoot tip gave significant difference was 53.1% while leaf primordial gave 28.1%

Primary callus was transferred to fresh MS medium containing (0

5

10 and 20) mg/L of NAA with 3mg/L 2iP

Results were recorded after 12 weeks. A highest value of embryonic callus induction percentage or fresh weight and dry weight 87.5% or 1.56g and 0.47g for the character respectively for the treat 20 mg/L while control treatment 0.0 gave the lowest value 12.5% or 0.37g and 0.14g for same character respectively. Inoculated 1g fresh biomass into a 250 ml Erlenmeyer flask containing 50 ml MS liquid medium supplemented with NAA 20mg/L and agitated at 150 rpm by shaker to making suspension culture the measurements of packed cell volume ( pcv) or fresh and dry weight taken weekly for 12 weeks

maximum values were reached in the eighth week of PCV and fresh weight but the dry weight reached to highest value in seventh week

then the curve began to decline gradually until it reached stability in the last two weeks. The cell suspension was Diluted to different initial cell density of 100

500

10000

50000 and 100000 cells /ml with hemocytometer. The initial cell number of (10000) cells gave significant different of plating efficiency PE (11.6)% while (100) cells gave lowest value 1.8% of PE.

Ali A.

...Show More Authors

View Publication

1 2 3 4 ... 1789 1790 1791 1792