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ENVIRONMENTAL SCIENCE AND ENGINEERING
I NEED AN EXPERT TUTOR WHO CAN MAKE A GOOD QUALITY OUTPUT.
Answer the following question:
1. List three reasons why the BOD (Biological Oxygen Demand) rate constant may vary.
2. What are the indications of low BOD (Biological Oxygen Demand)?
3. What are processes involved in water treatment?
4. What is Beer's law?
5. What is the difference between disinfection and sterilization?
Find the frequency of a repeating waveform whose period is - 1/60 s, 0.01 s, 34 ms, and 25 ms.
Develop the VHDL text file for a binary down-counter to divide a frequency by 32. Use Q as the outputs and CLK as the falling edge clock input.
The input power is 0.78 watts. The efficiency of the amplifier must be at least 61%. What must the gain of the amplifier be, how much power is at the output, and how much power is dissipated
Create the Walsh code matrix for a W16. (c) For IS-95, on the forward link, list the Walsh code assigned to the various logical channels (hint: there are 64 Walsh codes)
The surface concentration is fixed at N0=1.8e20/cm^2 when diffusing boron into a uniformly doped n-type substrate. The atomic diffusion constant for boron in Si at the temperature of 950 C is 3.0e-15 cm^2/s.
Find the mathematical expression for the current through the coil once the switch is closed. - Find the mathematical expression for the voltage across the coil during the same transient period.
Load the circuit file for Section 14-5c. Design a circuit using a monostable multivibrator that will convert a 10-kHz, 70% duty cycle square wave into a 50% duty cycle square wave. Demonstrate your waveforms to your instructor.
The design guidelines for a circuit call for using only 1/4 W resistors. This means that the resistors are only capable of dissipating .25W of power without sustaining damage. The maximum voltage level in the circuit is known to be 12 V.
Sketch the voltage and current along the system for t = 0-.
Calculate the p.d. developed across a 750 Ω resistor when the current flowing
In the following code, all signals are 1-bit std_logic. Draw a logic diagram that corresponds to the code. Assume that a D flip-flop with CE is available.
A coil with resistance 3Ω and inductance 100 mH is connectedin series with a capacitor of 50 pF, a resistor of 6Ω, and asignal generator that gives 110 V rms at all frequencies. Calculate ωo ,Q, and B at resonance of the resultant series RLC circu..
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