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Determine the carburizing time necessary to achieve a carbon concentration of 0.35 wt% at a position 2 mm into an iron–carbon alloy that initially contains 0.10 wt% C. The surface concentration is to be maintained at 1.30 wt% C, and the treatment is to be conducted at 1000C. Use the diffusion data for -Fe?
Can you explain the differences in partitioning among several compartments in terms of mass distribution and the compounds physical and chemical properties. For example, TCE mass distribution in air, water, soil, sediment, suspended solids and biota ..
The drinking water standard for dioxin is 3 x 10-8 mg/L. Using EPA exposure factors for residential consumption, what lifetime risk would this pose? What concentration would correspond to a risk of 10-6? The following data and assumptions apply: Data..
A square building (15 m × 15 m in plan) is to be constructed on a site where the soil profile consists of 3m of clay with an over-consolidation ratio that varies from 5 at the surface to 2 at 3m overlying a 5m thick clay
A rural town with sewered population of 4,500 has a daily wastewater flow of 1,590 m3/day with an average BOD of 280 mg/L including industrial wastes. The industrial discharges to the municipal sewers are 57 m3/day at 1,800 mg/L BOD
The specifications for a project specify that the in-situ soil must be compacted to 98% of its maximum Modified Proctor Density. What is the range of water contents of the in-situ soil that will meet this criteria?
The channel entrance is rounded and smooth (negligible head loss at entrance), and the reservoir water surface is 2.5 m above the bed of the channel at the entrance. hf=0.00019*Q2, where Q (in m3/s) is the discharge in the channel.
Estimate the steady state PM10 concentration assuming a PM10 deposition velocity of 0.12 cm/s, prevailing wind velocity of 2.5 m/s, and a constant emission flux of PM10 0.82 mg/m2-s.
if the BOD5 of waste is 327 mg/l, what sample size (in percent) should be selected to yield an oxygen consumption of 4.8 mg/l
a). Determine the state of stresses in the walls and indicate these stresses (including arrows to denote the direction of the stresses) on the element below. b). Then, determine the maximum in-plane shear stress on the wall of the pipe using Mohr's..
Head loss and sunshine striking a pipeline cause the temperature of the water flowing inside to rise by 2 degrees Celsius between two measuring points. Find the heat gain in J/N and cal/N.
A dye mill has a highly coloured wastewater with a flow of 32 million L/day. One suggestion has been to use biological measn to treat the watewater and remove the colour, so a pilot study is performed.
An 8-inch water main with a flow rate of 14 ft3/sec raises 100-feet. At the beginning of the main the pressure is 110 psig and drops to 50-psig at the end. For this water main calculate the head loss
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