Shear strengthening of reinforced concrete beams using NSM/EBR techniques

Abdel-kareem, Ahmed H.,Debaiky, Ahmed S.,Makhlouf, Mohamed H.,Abdel-baset, M. Techno-Press 2021 Advances in concrete construction Vol.12 No.1

This paper presents the experimental results of research into the behavior of shear-enhanced reinforced concrete R.C beams using steel stirrups, Fiber Reinforced Polymers FRP rods, and Fiber Reinforced Polymers FRP strips. This enhancement was accomplished by the Near Surface Mounted technique NSM. The NSM technique contains a groove on the outside surface of the concrete member to adjust the depth to be less than the cover of the member. After cleaning, the epoxy paste was used to fill half of the groove's depth. In the groove, the particular FRP element is then installed. Finally, the groove is filled with epoxy and the outside surface of the concrete is levelled with so much epoxy. This method enables the fiber reinforcement polymer FRP materials is covered completely by epoxy. The objective of this research is to study the effect of NSM technique on shear resistance for stressed beam. 13 experimental studies of half-scale R.C beams were involved in this paper. The experimental program included two specimens strengthened with steel stirrups, eight specimens strengthened with stirrups of Glass Fiber Reinforced Polymer GFRP rods with the shape of deferent end anchorage and angle, two specimens strengthened with externally bonded GFRP strips. The remaining un-strengthened specimen was allocated for comparison as a control one. The test results included ultimate load of capacity, deflection, cracking, and failure mode. All beams enhanced with GFRP rods showed a capacity improvement ranging from 14% to 85% compared to the reference beam, and compared to the reference beam, beams enhanced with GFRP strips showed a capacity improvement ranging from 7% to 22%.

Pectoral nerve blocks for transvenous subpectoral pacemaker insertion in children: a randomized controlled study

Elhaddad Ahmed Mohamed,Hefnawy Salwa Mohamed,El-Aziz Mohamed Abd,Ebraheem Mahmoud Mostafa,Mohamed Ahmed Kareem 대한마취통증의학회 2023 Korean Journal of Anesthesiology Vol.76 No.5

Background: Postoperative pain management after pacemaker insertion routinely requires opioid agents, nonsteroidal anti-inflammatory drugs, or paracetamol. However, interest in opioid-sparing multimodal pain management to minimize postoperative narcotic use has increased recently. This study aimed to assess the pectoral nerve (PECS) block versus standard treatment on postoperative pain control and opioid consumption in pediatric patients after transvenous subpectoral pacemaker insertion.Method: In this randomized controlled study, 40 pediatric patients underwent transvenous subpectoral pacemaker insertion with either congenital or postoperative complete heart block. Patients were randomly assigned to two groups: Group C (control) received conventional analgesic care without any block and Group P (pectoral) received a PECS block. Demographics, procedural variables, postoperative pain, and postoperative opioid consumption were compared between the two groups.Results: In children undergoing transvenous subpectoral pacemaker insertion, the PECS block was associated with a longer procedure time; however, the cumulative dose of fentanyl and atracurium was reduced and the hemodynamic profile was superior in Group P compared with Group C intraoperatively. Postoperatively, the PECS block was associated with lower postprocedural pain scores, which was reflected by the longer interval before the first call for rescue analgesia and lower postoperative morphine consumption, without an increase in the rate of complications.Conclusion: Ultrasound-guided PECS blocks are associated with a good intraoperative hemodynamic profile, reduced postoperative pain scores, and lower total opioid consumption in children undergoing transvenous subpectoral pacemaker placement.

Reduced Fertility and Fecundity among Patients with Bipolar I Disorder and Schizophrenia in Egypt

Hader Mansour,Kareem Kandil,Warda Fathi,Mai Elassy,Ibtihal Ibrahim,Hala Salah,Amal Yassin,Hanan Elsayed,Salwa Tobar,Hala El-Boraie,Ahmed Eissa,Mohamed Elhadidy,Nahed E. Ibrahim,Wafaa El-Bahaei,Vishwaj 대한신경정신의학회 2011 PSYCHIATRY INVESTIGATION Vol.8 No.3

Objective To evaluate reproduction among patients with bipolar I disorder (BP1) or schizophrenia (SZ) in Egypt. Methods BP1 patients (n=113) were compared with community based, demographically balanced controls (n=124) and SZ patients (n=79, DSM-IV). All participants were evaluated using structured interviews and corroborative data were obtained from relatives. Standard indices of procreation were included in multivariate analyses that incorporated key demographic variables. Results Control individuals were significantly more likely to have children than BP1 or SZ patients (controls 46.8%, BP1 15.9%, SZ 17.7%), but the BP1-SZ differences were non-significant. The average number of children for BP1 patients (0.37±0.9) and SZ patients (0.38±0.9) was significantly lower than for controls (1.04±1.48) (BP1 vs controls, p<0.001; SZ vs controls, p<0.001). The frequency of marriages among BP1 patients was nominally higher than the SZ group, but was significantly lower than controls (BP1: 31.9% SZ: 27.8% control: 57.3%). Even among married individuals, BP1 (but not SZ) patients were childless more often than controls (p=0.001). The marital fertility, i.e., the average number of children among patients with conjugal relationships for controls (1.8±1.57) was significantly higher than BP1 patients (1.14±1.31, p=0.02), but not significantly different from SZ patients (1.36±1.32, p=0.2). Conclusion Selected reproductive measures are significantly and substantially reduced among Egyptian BP1 patients. The reproductive indices are similar among BP1 and SZ patients, suggesting a role for general illness related variables. Regardless of the cause/s, the impairment constitutes important, under-investigated disability. Objective To evaluate reproduction among patients with bipolar I disorder (BP1) or schizophrenia (SZ) in Egypt. Methods BP1 patients (n=113) were compared with community based, demographically balanced controls (n=124) and SZ patients (n=79, DSM-IV). All participants were evaluated using structured interviews and corroborative data were obtained from relatives. Standard indices of procreation were included in multivariate analyses that incorporated key demographic variables. Results Control individuals were significantly more likely to have children than BP1 or SZ patients (controls 46.8%, BP1 15.9%, SZ 17.7%), but the BP1-SZ differences were non-significant. The average number of children for BP1 patients (0.37±0.9) and SZ patients (0.38±0.9) was significantly lower than for controls (1.04±1.48) (BP1 vs controls, p<0.001; SZ vs controls, p<0.001). The frequency of marriages among BP1 patients was nominally higher than the SZ group, but was significantly lower than controls (BP1: 31.9% SZ: 27.8% control: 57.3%). Even among married individuals, BP1 (but not SZ) patients were childless more often than controls (p=0.001). The marital fertility, i.e., the average number of children among patients with conjugal relationships for controls (1.8±1.57) was significantly higher than BP1 patients (1.14±1.31, p=0.02), but not significantly different from SZ patients (1.36±1.32, p=0.2). Conclusion Selected reproductive measures are significantly and substantially reduced among Egyptian BP1 patients. The reproductive indices are similar among BP1 and SZ patients, suggesting a role for general illness related variables. Regardless of the cause/s, the impairment constitutes important, under-investigated disability.

Two-dimensional silicon carbide monolayer as a promising drug delivery vehicle for hydroxyurea anti-cancer drug

Adel Mohaned,Kadhim Mustafa Mohammed,Muttashar Halah Hasan,Hachim Safa Kareem,Abdullaha Sallah Ahmed,Rheima Ahmed Mahdi 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6

In nanobiotechnology, organic molecule-containing two-dimensional nano-structured materials are considered crucial for developing horizontal bio-inorganic nano-devices for pharmaceutical applications. We present a complete review of the application of silicon carbide monolayer (SiCML) for smart drug delivery of hydroxyurea (HU) through density functional theory computations. Also, interacting host-guest complexes with different approaching orientations, the charge transport, and the interaction strength were scrutinized. It was found that the application of HU together with SiCML was significantly effective for bio-functionalization with −35.86 kcal/mol interaction energy. The charge transfer from HU to the SiCML was confirmed by Hirshfeld method. The findings of the current study provide useful insights into research on the application of functionalized nano-biomaterials for drug delivery, nano-medicine, and other related fields.

Determination of Surface Currents on Circular Microstrip Antennas

Wa"il A. Godaymi,Abdul-Kareem Abd Ali Mohammed,Zeki A. Ahmed 한국전자파학회JEES 2012 Journal of Electromagnetic Engineering and Science Vol.12 No.4

This work aims to present a theoretical analysis of the electric and magnetic surface current densities of a circular microstrip antenna (CMSA) as a body of revolution. The rigorous analysis of these problems begins with the application of the equivalence principle, which introduces an unknown electric current density on the conducting surface and both unknown equivalent electric and magnetic surface current densities on the dielectric surface. These current densities satisfy the integral equations (IEs) obtained by canceling the tangential components of the electric field on the conducting surface and enforcing the continuity of the tangential components of the fields across the dielectric surface. The formulation of the radiation problems is based on the combined field integral equation. This formulation is coupled with the method of moments (MoMs) as a numerical solution for this equation. The numerical results of the electric and magnetic surface current densities on the outside boundary of a CMSA excited by TM ₁₁- and TM ₂₁- modes are presented. The radiation pattern is calculated numerically in the two principle planes for a CMSA and gives a good results compared with measured results published by other research workers.