This paper focuses on the finite element (FE) response sensitivity and reliability analyses considering smooth constitutive material models. A reinforced concrete frame is modeled for FE sensitivity analysis followed by direct differentiation method under both static and dynamic load cases. Later, the reliability analysis is performed to predict the seismic behavior of the frame. Displacement sensitivity discontinuities are observed along the pseudo-time axis using non-smooth concrete and reinforcing steel model under quasi-static loading. However, the smooth materials show continuity in response sensitivity at elastic to plastic transition points. The normalized sensitivity results are also used to measure the relative importance of the material parameters on the structural responses. In FE reliability analysis, the influence of smoothness behavior of reinforcing steel is carefully noticed. More efficient and reasonable reliability estimation can be achieved by using smooth material model compare with bilinear material constitutive model.

Cavitation and cavitation-induced noise are harmful to both marine propellers and marine wildlife. Thus, it is required to reduce cavitation in marine propellers by developing the best design marine propellers. Moreover, proper material should be selected during the construction of marine propellers to withstand high-pressure loads. This paper presents an evaluation of the hydrodynamic characteristics such as cavitation and cavitation-induced noise of AU-outline GAWN series and B-series marine propellers at 0˚, 5˚, 10˚, and 15˚ rake angles using Computational Fluid Dynamics (CFD) analysis. Moreover, the study aims to find out the optimized propeller material among Nickel-Aluminum-Bronze (NAB), S2 glass, Aluminum 6061, and carbon fiber reinforced plastic (CFRP) materials. It is concluded that the lowest cavitation noises are 153.3 dB and 153.1 dB at a 10° rake angle for AU-outline GAWN series and B-Series marine propellers respectively. S2 glass is observed to be the optimum material at low rake angles, while CFRP is the optimum material at high rake angles compared to all other potential materials for both AU-outline GAWN series and B-series propellers.

Introduction: Treatment with misoprostol as per protocol is becoming widely recognized as a low cost and easy to use means of uterine evacuation. In contrast, post abortion care (PAC) with Dilatation evacuation and curettage (D, E & C), Manual Vacuum Aspiration (MVA) are costly and complicated procedures specially in inexperienced hands. Objective: To see the outcome of the patients treated with misoprostol as per the guideline. Materials and Methods: This prospective study was carried out at CMH Momenshahi from October 2016 to March 2017. 50 patients with 1st trimester abortion was selected, treated with directly observed doses of misoprostol. For incomplete abortion 600μgm orally, for missed abortion and blighted ovum 600 μgm sublingually, 3 hourly 3 doses. Then followed up after 7 days with an USG of pelvic organs report. Data was collected, processing was done using SPSS version 20. Results: Among 50 patients 10 were primigravida, 40 were multigravida. Their age ranged from 20-38 years. 11 had previous miscarriages. Gestational age ranged from 5-12 week. Symptoms were vaginal bleeding in 23, pain abdomen in 15 and both in 12 patients. 28 patients needed parenteral analgesia. Expulsion of product of conception occurred from 30 minutes to 96 hrs after administration of last dose. Surgical evacuation was done in 15 (30%) patients. Indications were excessive P/V bleeding and retained product of conception. Emergency curettage for bleeding was done in 4 patients. 5 patients needed readmission. All 50 patients attended after 7 days. Conclusion: Management of 1st trimester abortion with misoprostol as per guideline is highly satisfactory. But it requires patience, effective counselling and follow up. If we can follow these, we can reduce surgical interventions and its complications considerably. JAFMC Bangladesh. Vol 17, No 1 (June) 2021: 39-41

The design of a propeller plays a significant role in naval architecture. Optimization of various design factors is the primary concern for effective and efficient propulsion. This study investigates the optimization of the B-series marine propellers using three different methods, i.e. (i) a non-linear constrained single-objective optimization approach using the Non-Dominated Sorting Genetic Algorithm (NSGA-II), (ii) a python package for dynamic optimization based optimization software ‘Gekko’, (iii) an iterative approach and results were compared with each other. Efficiency is considered as the single objective function whereas three constraints are imposed: cavitation, thrust and strength. Analogous characteristics have been found in the comparison of results from all three methods. Comparing the various factors, this study suggests that, Gekko can be used as the optimization algorithm.

No abstract