Teachers and students opinion regarding updated MBBS curriculum 2012 in a teaching hospital.

The modern concept of a curriculum originally derived from the Latin word for a race course. Undergraduate medical education is part of a continuum of education and training.The new curriculum is structured to provide a balance among learning opportunities through integrated teaching system. This study was carried out to explore the views of teachers and students regarding the current undergraduate medical curriculum. This cross-sectional descriptive study was conducted between October 2019 to October 2020 among the teachers and students of a private medical college and hospital (MH Samorita medical collegesandhospital) in Dhaka Bangladesh. The sample size were 100 in total. Most of the participants suggested for changes in overall existing MBBS curriculum. Highest satisfaction was seen in content related to learning objectives that were 90% and highest dissatisfaction was seen in Phase distribution of subjects that were 89%.However, they were satisfied with present pattern of course content, objectives, evaluation system and carry on system. Teachers and students evaluation may prove useful if analyzed further to overcome the shortcomings of existing MBBS curriculum. Bangladesh Journal of Medical Education Vol.13(1) January 2022: 27-32

A Method Based on Only Currents for Determining Fault Direction in Radial Distribution Networks Integrated with Distributed Generations

Nowadays, more distributed generations (DGs) are connected to a radial distribution network, so conventional overcurrent relays cannot operate correctly when a fault occurs in the network. This study proposes a method to determine the fault direction in a three-phase distribution network integrated with DGs. The obtained pre-fault and fault currents are utilized to extract their phasors by the fast Fourier transform, and the phase angle difference between the positive-sequence components of the pre-fault and fault currents is used. Moreover, the method only uses the local current measurement to calculate and identify the phase angle change of the fault current without using the voltage measurement. Matlab/Simulink software is used to simulate the three-phase distribution network integrated with DGs. The faults with different resistances are assumed to occur at backward and forward fault locations. The simulation results show that the proposed method correctly determines the fault direction.

Spatial phase retrieval of vortex beam using convolutional neural network

Vortex beam (VB) possessing spatially helical phase–front has attracted widespread attention in free-space optical communication, etc. However, the spiral phase of VB is susceptible to atmospheric turbulence, and effective retrieval of the distorted conjugate phase is crucial for its practical applications. Herein, a convolutional neural network (CNN) approach to retrieve the phase distribution of VB is experimentally demonstrated. We adopt a spherical wave to interfere with VB for converting its phase information into intensity changes, and construct a CNN model with excellent image processing capabilities to directly extract phase–front features from the interferogram. Since the interference intensity is correlated with the phase–front, the CNN model can effectively reconstruct the wavefront of conjugate VB carrying different initial phases from a single interferogram. The results show that the CNN-based phase retrieval method has a loss of 0.1418 in the simulation and a loss of 0.2344 for the experimental data, and remains robust even in turbulence environments. This approach can improve the information acquisition capability for recovering the distorted wavefront and reducing the reliance on traditional inverse retrieval algorithms, which may provide a promising tool to retrieve the spatial phase distributions of VBs.

High-temperature nitridization of zirconium, production of ceramic and metal-ceramic refractory structures

Based on the results of the work performed, the nature of the phase distribution in the resulting material, structural and morphological differences between the layered metal-ceramic and ceramic structures were established. The temperature range of zirconium nitride synthesis from 1500 to 2400° C is investigated, and the possibility of successful synthesis of nitride ceramics by the indicated method at temperatures significantly exceeding the melting point of the metal is shown.

Effect of nanodiamond particle sizes on damping properties of ZK60 magnesium matrix composites

The aim of the research is to ensure that the material has functional mechanical properties as well as high-damping value. The microstructure, elemental composition, second phase distribution and interface structure of the Mg-based composite with different particle sizes were characterized by Optical Microscope(OM), X-Ray Diffractometer(XRD), Scanning Electron Microscope(SEM), Transmission Electron Microscope(TEM) and Energy Dispersive Spectrometer (EDS). The mechanical and damping properties of the ZK60 magnesium matrix composites were investigated an Instron5982 universal tester and Dynamic Mechanical Analysis (DMA). The results indicate that nanodiamond(ND) can disperse well in the composites. The elastic modulus of composite can reach 9.9GPa after reinforcement phase being added. Under certain conditions,the damping value can reach beyond 2.5×10-1, which is 117% of other composite. High-temperature damping depends on grain boundary slip and interface slip. The interfacial damping depends on the difference in the incoherent interface and thermal expansion coefficient between the nanodiamond and ZK60 matrix to slip and improve the damping value.