Strengthening of Edge and Corner Columns using Concrete Jackets

Strengthening of columns using concrete jackets depends on friction at the interface between them. So strengthening of edge and corner columns in only one story needs a large cross section area due to the shortage of friction length which leads to architectural issues. This research aims to study strengthening the edge and corner columns using a concrete Jacket in more than one story which increases the friction area between the Jacket and the original column. As a result, the load transferred from original column to the jacket will be increased. Thirteen models were done using ANSYS program to study the effect of various factors on the Jacket capacity such as the number of strengthened floors, the Jacket type (two sides or three sides), and whether there were shear connectors or not. The results showed that in the case of the edge and corner columns, it is preferable to strengthen the column by making a concrete Jacket on at least two or three floors to increase the surface area, which leads to increase the friction and thus increases the capacity of the strengthened column by an acceptable percentage. The results of ANSYS models were compared with the Indian code IS 15988 (2013) and the results were shown differently because the code equations depend on the presence of a full bond between the concrete column and the Jacket, which does not occur, but rather the load is transferred by friction between the Jacket and the original column. Doi: 10.28991/cej-2021-03091716 Full Text: PD

Role of new oral antithrombin in management of thrombophilia presented with multiple infarctions (cerebral, myocardial and pulmonary embolism)

AbstractBackgroundThromboembolic disease is a major cause of mortality and morbidity Current anticoagulant therapies have several caveats in the clinical use. New oral antithrombin (Dabigatran) provides comparable or superior thromboprophylaxis in multiple thromboembolic disease indications compared to standard of care.Aim of this workTo evaluate the role of a new oral antithrombin, in management of thrombophilia presented with multiple infarctions (cerebral infarction, myocardial infarction, pulmonary embolism or infarction).Patient and methodsThis work was done on 100 patients with thrombophilia associated with multiple infarctions (cerebral infarction, myocardial infarction, pulmonary embolism or infarction). They were divided into 2 groups Group I: treated by LMW heparin. Group II: treated by dabigatran. The following was done for all patients. Thorough history taking, complete physical examination, investigations including CT, D Dimer, INR, APTT, Platelet count, Chest X ray P/A and lateral view, CT chest and/or Brain, ECG, CKMB and troponin when needed.ResultsThe percentage of Stroke/TIA, AF/MI, PE, mixed and peripheral thrombotic events were 30, 24, 23, 26 and 6 patients respectively

Synthesis and Single Crystal X-Ray Structure of New (2E)-2-[3-(1H-Imidazol-1-yl)-1-phenylpropylidene]-N-phenylhydrazinecarboxamide

Synthesis, spectroscopic characterization and X-ray crystal structure of a new (2E)-2-[3-(1H-imidazol-1-yl)-1-phenylpropylidene]-N-phenylhydrazinecarboxamide (4) are reported. The stereochemistry of the title compound 4, C19H19N5O, about the imine bond [1.296 (4) Å] was assigned to have (E)-configuration. In the urea moiety, the N–H entities are trans to each other, and one of these forms is an intramolecular N–H⋯H hydrogen bond. The compound crystallizes in the monoclinic space group P21/c with a = 5.8093 (2) Å, b = 20.5575 (6) Å, c = 14.0355 (5) Å, α = 90.00°, β = 97.365° (2), γ = 90.00°, V = 1662.36 (10) Å3, and Z = 4. The molecules are packed in crystal structure by weak intermolecular hydrogen interactions