Studies on photoionization

Imperial Users onl

Stress Corrosion Cracking of Stainless Steels used in Manufacturing Brine Circulating Pumps used in Desalination Plants.

In earlier works, characterization and stress corrosion cracking of casings of brine recirculation pumps used in desalination plants was investigated. These casings, which were manufactured from two types of Ni resist ductile irons, were reported to show different service lives. Material selection of casings is believed to be one of possible factors to extend the service lives of these pumps. Two types of stainless steels; UNS S31603 and UNS S32750 were recommended as substitutes to Ni resist ductile irons. In this work, mechanical, metallurgical, electrochemical and stress corrosion cracking (SCC) tests were conducted on as received samples, made from these two types of stainless steels. As stress corrosion cracking rig was constructed, calibrated and connected to an internet webcam for monitoring purposes. Results have shown considerable higher yield and tensile strengths and corrosion resistance for the UNS S32750 over the UNS S31603. Electrochemical tests confirmed this behavior and have shown reproduced pitting attack illustrated by measured pitting potentials and visual observations for the UNS S31603 samples. UNS S32750 samples have shown no signs of pitting. Furthermore, stress corrosion cracking tests in the hot brine environment have shown less resistance to stress corrosion for UNS S31603 samples as demonstrated by sample cracking failures after few days of stress corrosion testing. No stress corrosion cracking was observed for UNS S32750 samples under the same testing conditions

Retracted: Performance Analysis of Internet of Things Protocols Based Fog/Cloud over High Traffic

This article was withdrawn and retracted by the Journal of Fundamental and Applied Sciences and has been removed from AJOL at the request of the journal Editor in Chief and the organisers of the conference at which the articles were presented (www.iccmit.net). Please address any queries to [email protected]

Taxonomical study of Caroxylon jordanicola (Eig) Akhani & Roalson (Amaranthaceae) in Al-Tar Caves, Karbala, Iraq

The present study dealt with the morphological, anatomical,trichomespollen grains,and ecological characteristics of Caroxylon jordanicola (EigAkhani & Roalson (Amaranthaceae) in Al-Tar Caves, Karbala, Iraq which belongs to the Amaranthaceae family. The results of the present study demonstrated that There are distinctive characteristics of the studied species distinguish it from other species and facilitate its diagnosis. The sample was diagnosed using the taxonomic keys of the Iraqi flora and the flora of neighboring countriesIn addition to some available research. The results of the morphological and anatomical features investigation provide really significant taxonomical value to distinguish the species. The results that showed that this species is annual to 40 cm, semi- spherical, lower leaves 1-3 cm, caduceus, other leaves to 2.5 mm, with broad, has non-glandular trichomes and glandular trichomes. The species recorded 7 μm the average thickness of the cuticle layer. cortex thickness was also recorded and measured, which was 210 μm. the average thickness of Phloem was 40μm, It has the presence of a bundle cap fibers (Bundle sheath) which consists of sclerenchyma fibers that appear in a ring around the Phloem. The average thicknesof  xylem was 190 μm and  pith thickness was 240 μm

Morphoanatomical study of some species from fabaceae family in Iraq

The current study dealt with comparative morphological and anatomical study of different species of Leguminosae family in Iraq. The study included seven species : Albizia lebbeck Benth. , Alhagi maurorum Medik. , Cassia sopheral Roxb. , Leucaena leucocephala Lam. , Medicago sativa Boiss., Trifolium repens Boiss, Vicia tenuifolia Roth. .The morpho-anatomical study is very important to distinguish between them. Samples of the study were collected from different areas in Iraq during flowering period between 2021-2022. In the present research, cuticular and epidermal anatomical features were described, in addition to the anatomical features of stems, leaves and petiole. Results showed that some of the morphological and anatomical characters of studied parts have good taxonomic value to distinguish between above studied species. Epidermis characters have taxonomic significance , espeically the nature of anticilinal walls and types of stomatal complexes , while dimensions of stem cells and the rates of the length of stomata were limited taxonomic importance . The general shapes of cross – sections of stem showed great taxonomic significance for isolation species , as well as cortex thickness .

Studying the Effect of Roughness of Wet Road on Critical Speed of Vehicle

Hydroplaning is one the most dangerous phenomena which effect on the safety of driving cars on wet roads, then, the critical speed of slipping cars is an important parameter in the hydroplaning ,and depends on the properties of the following three parameters: tires, water layer and road surface. The road texture is the main property of road specifications which affect directly on the critical speed of the vehicle. In the present work, the properties of road roughness and influence of surface texture on critical speed of vehicle are studied with variation of the following parameters: thickness and dynamic viscosity of water on the road surface and the vehicle load. The results showed that increasing the road surface roughness and the vehicle load both has a appositive influence on the critical speed (increase)of the vehicle, while increasing the dynamic viscosity and thickness of the water layer on the road surface has a negative influence on the critical speed (decrease) of the vehicle