In this research work the interaction between waves and horizontal slotted submerged breakwater has been investigated using numerical model.Two-dimensional numerical model based on the SOLA-VOF (SOLution Algorithm-Volume Of Fluid) method developed for wave interaction with fixed submerged breakwater has been updated in this research to study the wave interaction with horizontal slotted submerged breakwater. From the developed two-dimensional numerical model water surface profile, velocity components, magnitude of pressure around breakwater of different porosities (n=0.4, 0.5 and 0.6) and the value of F (VOF function) that represents fraction of volume occupied by fluid at any time are obtained. This study is expected to serve as a useful model to analyze wave deformation due to horizontal slotted submerged breakwater and will be important for designing submerged porous breakwater as a coastal protection measure.

Substitution of chromium in Mn-Zn ferrite and its effect on structural and magnetic properties has been studied. Samples were synthesized by combustion method and sintered at various temperatures (Ts). XRD patterns indicate that the samples are of single phase cubic spinel structure. The lattice parameter decreases with increase with substitution of Cr3+ content. Average grain size (D), bulk density (ρB), initial permeability (μi / ), Néel temperature (TN) decrease with the increase in chromium content. ρB was found to increase with increase in Cr3+ content as the Ts is increased. The Ts affect the densification, grain growth and μi / of the samples. μi / strongly depends on D, density and intragranular porosity. TN was found to decrease with the increase in Cr3+ concentration. This is attributed to the weakening of A-B interaction. The sharp fall of μi / at TN indicates that the compositions are homogeneous. Saturation magnetization (Ms), Coercive field (Hc), Residual induction (Br) were studied as a function of Cr3+ content. The Ms was found to decrease with the increase of Cr3+ content, which is attributed to the dilution of A-B interaction. The inclusion of Cr3+ caused the Ms, Br and hysteresis losses to decrease.

In Bangladesh, the major challenges in producing highly customized products like prosthetics are the fulfillment of the demand in least possible time and cost. This study aims to mitigate these problems associated with the concurrent production system by incorporating Cloud Based Design and Manufacturing (CBDM) which refers to a service-oriented collaborative product design and development model where service consumers are capable of selecting, configuring, and utilizing customized product manufacturing resources and services ranging from computer-aided engineering design software to rapidly reconfigurable shared manufacturing resources. The study includes an overview of the current situation of prosthetic production and the possible benefits and challenges of CBDM implementation in Bangladesh. It also presents a comparison between three production models for transtibial prosthetic in perspective of Bangladesh including traditional, combined and CBDM method depending on production time, capacity and unit product cost. Approximate production time and capacity is determined by simulating each model in ARENA simulation software and unit product cost is calculated by conventional costing method. Analysis of these production models has proven CBDM to be helpful in transtibial prosthetic production when incorporated with the traditional manufacturing process resulting in achieving higher capacity, shortest delivery time and least possible cost which can provide a promising approach to implement CBDM in Bangladesh in the future.

Condensate water generated from air conditioning system is often treated as wastewater and discharged to the building drainage system. In this study, controlled experiments have been carried out to assess generation of condensate water under different weather and operational conditions. The most important parameters affecting condensate water generation are time, difference between outdoor and indoor temperature and humidity. The difference between outdoor and indoor humidity has been found to affect generation of condensate water most significantly; as the difference increases, water generation increases. Water generation also increases as the difference between indoor and outdoor temperature increases. The experimental results have been used to develop and validate an empirical relationship for estimating generation of condensate water. Apart from estimation of condensate water generation in residential and commercial buildings, the relationship could be used to properly design condensate water drainage system of air conditioners. The quantity of condensate water generated from air conditioning system appears to be quite significant. Recycling of condensate water could reduce water demand from city water supply system particularly during the hot and humid months of the year, thus reducing pressure on precious ground and surface water resources.

Data growth in the Bangladeshi telecom market has reduced the prominence of traditional wire line broadband technologies such as digital subscriber line and cable modem. These technologies are not efficient enough to meet the customers’ demand for high-bandwidth applications such as high-speed internet access, video-on-demand, high definition TV, IPTV and online gaming. In this scenario, fibre-tothe- home (FTTH) technology, which offers advantages like high bandwidth capacity and the delivery of high speed, high quality and multi-play services (data, voice and video) through a single channel, presents a strong business opportunity for telecom operators. Gigabit Passive Optical Networks (GPON) is a burning technology in the world. Full Service Support, including voice (TDM), Ethernet, ATM, leased lines, and others. Strong Operations, Administration, Maintenance, and Provisioning (OAM&P) capabilities offering end-toend service management. GPON not only provides substantially higher efficiency as a transport network, but also delivers simplicity and superb scalability for future expansion in supporting additional services. To deploy FTTx Network by GPON technology has some obstacle but it has good flavor. GPON technology is cheaper than typical Ethernet Network. Sometimes it (GPON) saves more than seven to Eight times cost then Ethernet. Not only the developed country but also the developing country like, India, Bangladesh, Bhutan are using GPON technology.