InxGa1-xAs on a GaAs substrate.

A coherently strained quantum well laser has to be made from InxGa1-xAs on a GaAs substrate. If the minimum thickness of the region is 50 Ǻ, calculate the maximum composition of In that can be tolerated. Assume that the lattice constant of the alloy can be linearly interpolated from its components.

Use the following equation: mg (IDO – FDO) – Seed correction BOD5,

Given that the seed correction for BOD is 0.69 mg/L and the total volume is 300 mL, calculate the BOD for the raw data and report the results for each sample number. Use the following equation: mg (IDO – FDO) – Seed correction BOD5, L (sample ml)/(total volume) Raw Data for BOD Sample Number 1 2 3 4 IDO (initial DO) 8.82 8.78 9.94 8.75 FDO (final DO) 4.03 4.36 3.87 1.96 Sample volume (mL) 3 1 300 8

A two-storey residential building is to be constructed on a riverside plot (protected by a river wall) in South Downs, East Sussex.

A two-storey residential building is to be constructed on a riverside plot (protected by a river wall) in South Downs, East Sussex. The ground consists of a top 0.1m dark grey spongy-like soil over 3.9m thick made ground, overlying a 5m-thick river alluvium layer (granular sand and gravel) on chalk bedrock. The alluvium layer contains a lenses of silty soils which seems to be loess. A plan view of the site and a longitudinal cross section through the site are illustrated in Figure Q4. The residential building is shown as Block H on the plan drawing. With proper reasoning, recommend a foundation solution (shallow or pile) and comment on the possible design/construction challenges.

Conditional Probability Mass Function The random variable X is Bernoulli(p) with X=1 Px[x] = { P. 1 p, X=0. If X = 1

53 Conditional Probability Mass Function The random variable X is Bernoulli(p) with X=1 Px[x] = { P. 1 p, X=0. If X = 1, a point is selected at random from region A (A is the right-hand side shaded region), and if X = 0, a point is selected at random from region B (B is the left side shaded region), as shown in Figure 2 . If the random point is selected in an upper quadrant, we set Y = 1, and if the random point is selected in a lower quadrant, we set Y = 0. Answer items (a) and (b) assuming that the probability of a point falling inside a region is directly proportional to the area of that region. Note that the contour lines of the shaded regions follows quadratic equations. (a) Find the conditional probability mass function Pyx[Y = y X = x) for x = 0, 1 and y = 0, 1. (b) Find the Py[Y = 0). 3 1 u 0 -4 13 -2 1 1 2 3 4 B A Figure 2 Regions A and B (shaded only).

Find the worst case input required current for one of the load gates when the output of the driving gate (Vout=VIH.(10)

Given: Br=20, Vref-1.2V, VBE(on)=0.7V , VD(on)1,2=0.2V 2k 1.68k 2k Q3 NPN D1 Vi1 If Q1 NPN Q2 NPN -1.2V Vout D2 VI2 5.33k 23k -3.3V -3.3V Figure 3 (a) Find the function of the gate by giving the truth table. (2) (b) Find Vil. (3) (c) Find VIH. (3) (d) Lets say we have N number of load gates identical to the driving gate in Figure 3. Find the worst case input required current for one of the load gates when the output of the driving gate (Vout=VIH.(10) (e) Find lou when the output of the driving gate is ViH. (10) (1) Find N “I” from part d) and e). (2)

Assignment GaAs Oscillator 1. What is the threshold potential across one nano-metre?

Assignment GaAs Oscillator 1. What is the threshold potential across one nano-metre? (Hint: see Lab-Volt handout) 2. In Fig. 3-2 (Lab-Volt handout), indicate various energy bands (Hint: See Fig. In Streetman), and draw the corresponding E-k diagram 3. Using the values given in Lab-Volt handout, draw a parallel resonant circuit and give lumped element values for R, Land for generator oscillation frequency of 10 GHz 4. Resonant frequency of an air-filled cavity made with rectangular waveguide WR-90 for the fundamental TE10 mode is given by the equation given below. Calculate length of the resonant cavity: 10 = 2 ad /{a? + d? 30.5 where, a, b and d are the internal width, height and length of the waveguide To is the resonant wavelength C, speed of light is 2.997925 x 108 m/s f = 10 GHz 5. Calculate resonant frequency fo of the cavity, if all dimensions of the cavity change -10% and 10%. Is change in the resonant frequency symmetrical about fo ? C = foro fo > ان 5 Si GaAs 4 Upper valley 3 ΔΕ = 0. 3. T Energy (eV) Eg Lower valley Eg +++++ -1 -2 -3 L [111] X [100] X L [111] 5 [100] Wave vector

ASPHALT PAVING ON 12″ GRANULAR ‘A’ COMPACTED TO 100% PROCTOR DENSITY ON FILTER FABRIC GRANULAR ‘B’ COMPACTED TO 100% PROCTOR DENSITY IN 12″ LIFTS 180 4-6 EXCAVATION SECTION nts 10′-0″ 1-0″ 1-0″ 8′-0″ 2-25M (TYP. BOTH SIDES

2 / 2 100% + Perform a take off on the following items: 3000.01 SC CVL sawcut asphalt 2010.00 c 10 CVL box culvert bulk excavation 3101.00 CVL form for ( slab, walls and roof) 3301.00 CVL 35 mpa conc. for ( slab, walls and roof) 3162.00 key CVL keyway 3162.00 Ws CVL waterstop 3201.00 10m CVL 10M rebar 3201.00 15m CVL 15M rebar 3201.00 20m CVL 20M rebar 3201.00 25m CVL 25M rebar 3380.01 cf CVL concrete finish ( slab and roof only) 3166.00 st CVL wall snapties (for walls ) 3159.00 SO CVL strip and oil form (wall and roof forms only) 2225.00 gfa CVL granular A 2225.00 gfb CVL granular B 2145.00 ff CVL filter fabric 2511.00 HL3 CVL HL3 asphalt . • snapties are spaced @ 24″ o/c, EM for walls only concrete finishing is for inside of slab and top of roof wall forms are for the entire length of the tunnel at the ends they would put a sloped end cap that would hold the concrete in place strip and oil forms is for the walls and the underside of the roof . O 3″ ASPHALT PAVING ON 12″ GRANULAR ‘A’ COMPACTED TO 100% PROCTOR DENSITY ON FILTER FABRIC GRANULAR ‘B’ COMPACTED TO 100% PROCTOR DENSITY IN 12″ LIFTS 180 4-6 EXCAVATION SECTION nts 10′-0″ 1-0″ 1-0″ 8′-0″ 2-25M (TYP. BOTH SIDES) 1-82 1-10,10 1′-0″ 20M @ 4″O/C 25M @ 12″ 0/C 20M @12″ 0/C 12′-0″ 10-0″ 15M @ 6″ 0/C TYPICAL BOTH SIDES 20M @ 12″0/C TYPICAL BOTH SIDES 15M @12″ O/C 1-0″ KEYWAY W/ WATERSTOP TYPICAL 11-10-2 2-25M (TYP. BOTH SIDES) 10M @ 8″O/C 15M @12″ O/C TUNNEL SECTION nts 10.0 100 ST CLAIR EXPRESSWAY 250.0 230-0 8724 Dil Dil Dull, SITE PLANS 100 BOX CULVERT SITE PLAN 2021

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