The study of sex Structure and age characteristics of an important element of the
follow-up changes between different population groups, which are connected to a large degree
the demographic, social and economic characteristics, particularly since each population
group varying characteristics in terms of age, sex entail social, demographic, cultural and
economic implications, and from that the researcher has taken from Structure of sex and age
for population in the district of Tuz Khurmatu for (1997-2012 ) the subject of consideration
and maintain compared to see the contrast between them. Qualitative Research for installation
and the age of the urban and rural areas has touched the judiciary, as well as its respects.
The study showed a contrast ratio kind in the district of Tuz Khurmatu between urban and
rural areas and the province of Salahuddin according to 1997 census, with the percentage of
type in the judiciary (96 males per 100 females), which is lower than the amount of the
province (98 male). And height according to the population estimates for the year 2012, with
the percentage of type in the judiciary (106.4 males per 100 females), which is higher than the
proportion of the kind in the province and adult (105 male), and the record was attended by
eliminating a remarkable rise in the proportion of the type of (108.5 male per 100 females),
while it decreased in the countryside to reach (102 male). Can be explained by the migration
of males to urban areas, where diverse areas and employment opportunities compared to rural
areas, which determines the action only to agricultural activity. Forms Ahram population has
made it clear to eliminate aspects of him as a young characterized as a very broad base and
gradually Tenbj with sharp summit.
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Mass transfer has been studied at rotating cylinder electrodes fabricated with spiral-wound woven-wire meshes using reduction of copper as a test reaction. The experimental data were correlated by an empirical expression between the Sherwood number and the Reynolds number, both regarding the hydraulic diameter as a characteristic length. It was found that the Sherwood number was dependent upon the Reynolds number to the power of 0.521. An enhancement factor was adopted to compare the efficiency of the new rotating cylinder electrode with previous three-dimensional rotating cylinder electrodes. The results showed that the new type has a mass-transfer enhancement factor 2.3 times higher than those obtained with smooth rotating cylinder electr
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This systematic review aimed to investigate the relation between orthodontic treatment (OT) and the incidence of the gingival black triangle (GBT) after completing treatment with a fixed orthodontic appliance, as well as the associated risk factors and the level of alveolar bone. Electronic and hand searches were conducted in three electronic databases for relevant articles published up to March 2022. Retrieved articles went through a two-step screening procedure, and the risk of bias (RoB) was assessed by the Joanna Briggs Institute checklists. The incidence of GBT after OT was set as the primary outcome, while the secondary outcomes were the risk factors associated with GBT and alveolar bone loss following OT. Out of 421 papers, 5
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