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when food supplies have been exhausted populations die away this exponential decay is described by a simple
as a waste moves downstream exertion of the oxygen demand removes oxygen from the water and exchange with the air
1 a waste contains 100 mgl of acetic acid ch3cooh and 50 me of nh3-n determine the theoretical carbonaceous oxygen
1 a new wastewater-treatment plant proposes a discharge of 5 m3s of treated waste to a river state regulations prohibit
1 a waste has an ultimate cbod of 1000 mgl and a kl of 01 day-1 what is its 5-day cbod2 calculate the ultimate bod of a
the project tasks are outlined on the following pages the student must produce a typed report including equations
figure 5-11 showed world population growth over the past 2000 yearsa what population-growth model apparently describes
a 100 mw steam station uses coal of calorific value 6400 kcalkgthermal efficiency of the station is 30 and electrical
organic carbon c and ammonia nitrogen nh3 are oxidized to carbon dioxide co2 and nitrate no3- respectively by bacteria
the relation between water evaporated w kg coal consumption c kg and kwh generated per 8-hour shift for a steam
a copper rod of 40mm dai surroundedhighly by a cast iron tube of 80mm external dia the ends being firmly fasten
for each of the cases below assuming all other things unchanged describe the effect of the following parameter
it has been estimated that a minimum run off of approximately 94 m3sec will be available at a hydraulic project with a
1 a stream with a temperature of 25degc has a dissolved-oxygen concentration of 4 mgl what is the dissolved-oxygen
a river traveling at a velocity of 10 kmday has a dissolved-oxygen content of 5 mgl and an ultimate cbod of 25 mgl at
a 132 kv line with 1middot956 cm dia conductors is built so that corona takes place if the line voltage exceeds 210 kv
the blades of the portable fan generate a 4-n thrust t as shown compute the moment mo of this force about the rear
a 3-phase line has conductors 2 cm in diameter spaced equilaterally 1 m apartif the dielectric strength of air is 30 kv
water for a hydro-electric station is obtained from a reservoir with a head of 100 metrescalculate the electrical
the figure shows a simply supported beam with vertical forces 2p and p located at a and 2a respectively from the left
consider the simple triangular cantilever truss in exercise 216 and choose a 1 ea 1 and p 1a create a data file
the figure shows an n-type cantilever truss loaded by concentrated vertical force of magnitude p at the tip joint da
the figure shows a typical v-truss a-b from a building crane in this exercise the truss is considered as plane the
the figure shows a simply supported roof truss of length a and height h with vertical loads p at nodes e f and g