Bangladesh, a standout amongst the most crowded regions of Asia is at present experiencing Major energy emergency. Years of unconsciousness, absence of potential assets, labor, innovation and investment have taken the circumstance to an emergency level. Commercial energy consumption depends on natural gas (around 70%) trailed by coal, oil and hydropower. At present there is a huge difference between demand and generation of electricity. A step of building a nuclear power plant named Rooppur Nuclear Power Plant (RNPP) is taken by Government to fulfill this crying need. Bangladesh has planned to establish two Russian nuclear power reactors in operation (Rooppur-1 & Rooppur-2). The power plant will be built at Rooppur, 200 km north-west of Dhaka, at Paksey union on the bank of the Padma in the Ishwardi subdistrict of Pabna District, in the northwest of the nation. This paper discusses the prospect of green power generation using RNPP and evaluates different parameters whether it is a proper decision or not and also provides some necessary recommendations regarding the implementation of Rooppur Nuclear Power Plant.

Methanol-to-Gasoline Process involves the chemical transformation of Natural gas into usable gasoline range products. The objective of this work was to conduct a techno-economic analysis of Methanol-to-Gasoline Process, identifying heat integration, recycle and cost saving opportunities in the Process, and determining the Present-day Profitability of the Process. Aspen Hysys v8.6 was used in the model simulation, with an Auto-thermal Reformer being Used in modelling Synthesis Gas Manufacture, and a Plug Flow Tubular Reactor used in the methanol synthesis, with kinetic data similar to that of the commercial Cu/ZnO/Al2O3 Catalyst. The Gasoline synthesis reactor was modelled as a conversion reactor, with 94% conversion based on the CuO/ZnO/HZSM-5 zeolite conversion yield. It was also discovered, that starting with 10.02MMscfD of natural gas, we obtained 1462 Barrels/day of Gasoline, 82 Barrels/day of Methanol and 147 Barrels/day of Di-Methyl Ether. The total Capital Cost came to $172,360,500, the Operating Cost of $21,808,945 annually, and Gross annual revenue came to $26,575,626, with annual savings of $4,766,681. After Heat Integration and product recycle, a savings of $7,303,009 was realized (74% reduction). The simple payback period of 36.2 years and a Net-present value of -$94million after 20 years, indicating that the MTG process is not viable under the present economic situation. The results of the sensitivity analysis show that the MTG process will be profitable within the 1st 20 years when the price of natural gas falls $500/MMscf or is completely free, or when the interest rate falls 5% or when the inflation rate rises above 20%. The reason for its non-profitability was discovered to be its water to hydrocarbon volume distribution, with water being 53.32% and Gasoline was 46.68%.

Weirs are the most extensively used hydraulic structures in the different fields of hydraulics, environmental, irrigation, and chemical engineering, as flow measuring and flow control devices in open Channels. The object of the present paper is to study the effect of the geometry of crump weir on the coefficient of discharge (Cd) under different flow conditions. The experimental work was conducted in rectangular laboratory flume; fifteen physical models were used with five upstream angles (17o, 22o, 27o, 32o and 37o) and three different crest heights (10, 15 and 20) cm under free flow conditions. The results show that Cd value will increase with the decrease of crest height as well as with increasing flow rate; it is also directly proportional to the upstream slope and inversely to the downstream slope. Computational fluid dynamic (FLOW 3D) were used to conduct new experiments.An empirical relation was obtained to estimate the coefficient of discharge Cd under different height and upstream slopes crump weirs.

The aim of this study is to assess the state of plant biodiversity in the natural rangelands of transhumant cattle herds in the Classified Forest of Upper Alibori (CFUA), Northern Benin. Forty-five (45) phytosociological plots were carried out using the Braun-Blanquet method. The phytosociological data were submitted to Detrended Correspondence Analysis (DCA) under the software R.3.3.2 with a package vegan. The results revealed that the natural rangelands of the CFUA have 178 species belonging to 45 families of which the most abundant and dominant are the Poaceae, Caesalpiniaceae, Combretaceae and Rubiaceae. Three (3) types of pasture were highlighted: Detarium microcarpum and Pennisetum polystachion ; Isoberlinia doka and Brachiaria stigmatisata; Prosopis africana and Pennisetum pedicellatum. The most abundant and dominant biological types on these natural rangelands are phanerophytes followed by therophytes. However, Sudanese species are the most abundant and dominant. This shows that pastures in this protected area are relatively undisturbed. The unsweetened and invasive species such as Senna obtusifolia, Hyptis suaveolens, Loudetia togoensis, etc. were also observed in this natural rangeland. It follows from this study that the natural rangelands of CFUA are degraded due to the strong agropastoral pressure.