Theory and practice of regional integration based on the EurAsEC model (Russian point of view)

Adel Galiakberov,Adel Abdullin 한양대학교 아태지역연구센터 2014 Journal of Eurasian Studies Vol.5 No.2

This article shows Russian point of view on the evolution of Eurasian integration as related to plans to create a Eurasian economic entity based on the EurAsEC model that began with the creation of the Customs Union and Common Economic Space. The article analyzes the legal theory of Russian authors of EurAsEC, based on a review of this integration and the legal documents of this process. The article details the institutional mechanism of the functioning of Eurasian integration and its legal characteristics, and gives a short legal history. The article shows that integration of post-Soviet countries based on EurAsEC is more successful than integration based on the CIS model despite the lack of supranational power of the institutions of EurAsEC.

Adel Al Kharafi (World Federation of Engineering Organization-WFEO)

Adel Al Kharafi 대한토목학회 2011 대한토목학회지 Vol.59 No.13

Some reproductive characteristics of honeybee drones in relation to their ages

Adel M. MAZEED,Karem M. MOHANNY2 한국곤충학회 2010 Entomological Research Vol.40 No.5

The number of spermatozoa, length of testis, length of mucus gland and weights of drones were estimated in caged and free honeybee drones in relation to their ages. For this purpose, three Carniolan colonies were used as sources of drones and two were used as nursery colonies. The drones were held either in cages or freely in the queenless part of the nursery colonies. Measurements were carried out on samples of drones taken at 3-day intervals from 1–3, 4–6, 7–9, 10–12 and 13–15 days old. While the number of spermatozoa in drone testes decreased in both caged and free drones as the drone age increased, it increased gradually in the seminal vesicles. The results also showed that weight of drones and length of testes decreased, but the length of the mucus gland did not significantly differ with age. Further, the drones' weight, length of mucus gland and total number of spermatozoa tend to be slightly larger in the caged than in free drones. The total number of spermatozoa in all parts of the reproductive organs was lower in the older than younger drones; thus, the number of spermatozoa in the newly emerged drones does not help to predict the real number reaching the queen during mating.

Factors affecting in vitro embryo production: insights into dromedary camel

Adel R. Moawad,Ibrahim M. Ghoneim,Gamal M. Darwish,Magdy R. Badr,Diya A. El-Badry,Abou Bakr A. EL-Wishy 사단법인 한국동물생명공학회 2020 한국동물생명공학회지 Vol.35 No.2

The Dromedary camel (Camelus dromedaries) is an important species because of its ability to produce good quality meat, milk, and fibers under harsh environmental conditions. Camels are also crucial for transportation, racing, and as draft animals in agriculture. Therefore, dromedary camels play a critical role in the economy for millions of people living in the arid part of the world. The inherent capability of camels to produce meat and milk is highly correlated with their reproductive performance. Compared with other domestic species, the reproductive efficiency in camelids is low. Although recent reproductive technologies such as in vitro fertilization (IVF) and somatic cell nuclear transfer (SCNT) have been successfully applied to camelids and the birth of live offspring following these technologies has been reported; in vitro embryo production (IVP) has lagged in this species. The development of the IVP system for dromedary camels may be a useful tool for the genetic improvement of this species. IVP in farm animals includes three main steps; in vitro maturation (IVM) of an oocyte, IVF of a matured oocyte, and in vitro culture (IVC) of fertilized oocyte up to the blastocyst stage. This review aims to summarize various factors that influence oocyte quality, IVM, and in vitro embryo development in dromedary camel.

Directed strongly regular graphs and their codes

Adel Alahmadi,Ahmad Alkenani,김종락,Minjia Shi,Patrick Sole 대한수학회 2017 대한수학회보 Vol.54 No.2

The rank over a finite field of the adjacency matrix of a directed strongly regular graph is studied, with some applications to the construction of linear codes. Three techniques are used: code orthogonality, adjacency matrix determinant, and adjacency matrix spectrum.

Behavior of hybrid concrete beams with waste rubber

Adel A. Al-Azzawi,Noora Saad,Dalia Shakir 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.23 No.4

The studies on the applications of waste materials in concrete have been increased in Iraq since 2003. In this research, rubber wastes that resulting from scrapped tires was added to concrete mix with presence of superplasticizer. The mechanical properties of concrete and workability of concrete mixes were studied. The used rubber were ranging in size from (2-4) mm with addition percentages of (0.1% and 0.2%) by volume of concrete. The results of mechanical properties of concrete show that rubber enhance the ductility, and compressive and tensile strength compared to concrete without it. Also, the flexural behavior of hybrid strength concrete beams (due to using rubber at the bottom or top layer of section) was investigated. The rubber concrete located at bottom layer gives higher values of ultimate loads and deflections compared to the beam with top layer. A similar response to fiber concrete beam (all section contains 0.1% rubber) was recognized. Finite element modeling in three dimensions was carried for the tested beams using ABAQUS software. The ultimate loads and deflection obtained from experimental and finite elements are in good agreements with average difference of 8% in ultimate load and 20% in ultimate deflection.

Finite element study the seismic behavior of connection to replace the continuity plates in (NFT/CFT) steel columns

Adel Younesi,Omid Rezaifar 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.1

The use of box columns has been increased due to the rigidity in rigid orthogonal moment resisting frames. On the other hand, the installation and welding of necessary horizontal continuity plates inside the columns are both labor-consuming and costly tasks. Accordingly, in this paper, a new beam-to-box column connection by trapezoidal external stiffeners and horizontal bar mats is presented to provide seismic parameters. The proposed connection consists of eight external stiffeners in the level of beam flanges and five horizontal bar mats in Concrete Filled Tube (CFT) columns. The new connection effectively alleviates the stress concentration and moves the plastic hinge away from the column face by horizontal external stiffeners. In addition, the result shows that proposed connection has provided the required strength and rigidity of connection, so that the increased strength, 8.08% and rigidity, 3.01% are compared to connection with internal continuity plates, also the results indicate that this connection can offer appropriate ductility and energy dissipation capacity for its potential application in moment resisting frames in seismic region. As a result, the proposed connection can be a good alternative for connection with continuity plates.

Investigation of Likelihood of Cracking in Reinforced Concrete Bridge Decks

Adel ElSafty,Ahmed Abdel-Mohti 한국콘크리트학회 2013 International Journal of Concrete Structures and M Vol.7 No.1

One of the biggest problems affecting bridges is the transverse cracking and deterioration of concrete bridge decks. The causes of early age cracking are primarily attributed to plastic shrinkage, temperature effects, autogenous shrinkage, and drying shrinkage. The cracks can be influenced by material characteristics, casting sequence, formwork, climate conditions, geometry, and time dependent factors. The cracking of bridge decks not only creates unsightly aesthetic condition but also greatly reduces durability. It leads to a loss of functionality, loss of stiffness, and ultimately loss of structural safety. This investigation consists of field, laboratory, and analytical phases. The experimental and field testing investigate the early age transverse cracking of bridge decks and evaluate the use of sealant materials. The research identifies suitable materials, for crack sealing, with an ability to span cracks of various widths and to achieve performance criteria such as penetration depth, bond strength, and elongation. This paper also analytically examines the effect of a wide range of parameters on the development of cracking such as the number of spans, the span length, girder spacing, deck thickness, concrete compressive strength, dead load, hydration, temperature, shrinkage, and creep. The importance of each parameter is identified and then evaluated. Also, the AASHTO Standard Specification limits liveload deflections to L/800 for ordinary bridges and L/1000 for bridges in urban areas that are subject to pedestrian use. The deflection is found to be an important parameter to affect cracking. A set of recommendations to limit the transverse deck cracks in bridge decks is also presented.

Assessment of the risk factors associated with multidrug-resistant tuberculosis in Sudan: a case-control study

Adel Hussein Elduma,Mohammad Ali Mansournia,Abbas Rahimi Foroushani,Hamdan Mustafa Hamdan Ali,Asrar M A,Salam Elegail,Asma Elsony,Kourosh Holakouie-Naieni 한국역학회 2019 Epidemiology and Health Vol.41 No.-

OBJECTIVES: The emergence of multidrug-resistant tuberculosis (MDR-TB) is a major challenge for the global control of tuberculosis (TB). The aim of this study was to determine the risk factors associated with MDR-TB in Sudan. METHODS: This case-control study was conducted from May 2017 to February 2019. Patients newly diagnosed with MDR-TB were selected as cases, and controls were selected from TB patients who responded to first-line anti-TB drugs. A questionnaire was designed and used to collect data from study participants. Logistic regression was used to evaluate associations between risk factors and MDR-TB infection. The best multivariate model was selected based on the likelihood ratio test. RESULTS: A total of 430 cases and 860 controls were selected for this study. A history of previous TB treatment (adjusted odds ratio [aOR], 54.85; 95% confidence interval [CI], 30.48 to 98.69) was strongly associated with MDR-TB infection. We identified interruption of TB treatment (aOR, 7.62; 95% CI, 3.16 to 18.34), contact with MDR-TB patients (aOR, 5.40; 95% CI, 2.69 to 10.74), lower body weight (aOR, 0.89; 95% CI, 0.87 to 0.91), and water pipe smoking (aOR, 3.23; 95% CI, 1.73 to 6.04) as factors associated with MDR-TB infection. CONCLUSIONS: Previous TB treatment and interruption of TB treatment were found to be the main predictors of MDR-TB. Additionally, this study found that contact with MDR-TB patients and water pipe smoking were associated with MDR-TB infection in Sudan. More efforts are required to decrease the rate of treatment interruption, to strengthen patients’ adherence to treatment, and to reduce contact with MDR-TB patients.

Bone regeneration and graft material resorption in extraction sockets grafted with bioactive silica-calcium phosphate composite (SCPC) versus non-grafted sockets: clinical, radiographic, and histological findings

Adel-Khattab, Doaa,Afifi, Nermeen S.,el Sadat, Shaimaa M. Abu,Aboul-Fotouh, Mona N.,Tarek, Karim,Horowitz, Robert A. Korean Academy of Periodontology 2020 Journal of Periodontal & Implant Science Vol.50 No.6

Purpose: The purpose of the present study was to evaluate the effect of silica-calcium phosphate composite (SCPC) granules on bone regeneration in extraction sockets. Methods: Ten patients were selected for a split-model study. In each patient, bone healing in SCPC-grafted and control ungrafted sockets was analyzed through clinical, radiographic, histomorphometric, and immunohistochemical assessments 6 months postoperatively. Results: A radiographic assessment using cone-beam computed tomography showed minimal ridge dimension changes in SCPC-grafted sockets, with 0.39 mm and 1.79 mm decreases in height and width, respectively. Core bone biopsy samples were obtained 6 months post-extraction during implant placement and analyzed. The average percent areas occupied by mature bone, woven bone, and remnant particles in the SCPC-grafted sockets were 41.3%±12%, 20.1%±9.5%, and 5.3%±4.4%, respectively. The percent areas of mature bone and woven bone formed in the control ungrafted sockets at the same time point were 31%±14% and 24.1%±9.4%, respectively. Histochemical and immunohistochemical analyses showed dense mineralized bundles of type I collagen with high osteopontin expression intensity in the grafted sockets. The newly formed bone was well vascularized, with numerous active osteoblasts, Haversian systems, and osteocytes indicating maturation. In contrast, the new bone in the control ungrafted sockets was immature, rich in type III collagen, and had a low osteocyte density. Conclusions: The resorption of SCPC granules in 6 months was coordinated with better new bone formation than was observed in untreated sockets. SCPC is a resorbable bone graft material that enhances bone formation and maturation through its stimulatory effect on bone cell function.