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1. A drug is diffusing from the surface of a spherical pill through a radial shell with thickness d1. The radius of the pill is r1. The drug concentration at the pill surface is c1 and the concentration outside the shell is c2. The diffusion coefficient of the solute is D. From first principles, derive a steady state expression for the drug concentration c(r) and flux, J(r), inside the shell. 2. Estimate the diffusivity of a spherically shaped protein with a MW of 36,000 in water at 37oC. 3. Estimate the diffusivity of the same solute in problem # 2 through cylindrical pores of a membrane that is 28 nm in diameter. Assume that the molecule enters the pores of the membrane from a well-stirred bulk solution. Thank you.
If a sonusoidal waveform has a frequency fo=1,010Hz and is sampled with fs=100Hz, what value of fa is perceived from the samples
A potentiometer with a total range of 350° is supplied with a voltage of 12 Vdc. Find the output voltage for an angle of 135°. An absolute optical rotary encoder has five tracks. How many bits is the output
what is the phase and Vrms of a 1KΩ resistor connected to a bridge circuit of two inductors (50 and80mH) on the right and two capacitors (90 and 75nF) on left side ofthe bridge.
The pressure of the gas within the bag remains at 1 atm and its temperature remains at room temperature 20.0 Celsius. How many moles 'n' have been introduced into the bag by the time its volume reaches 22.4 L
A 1 load draws 6 MW at 0.8 power factor lagging. Determine the reactive power required from a parallel capacitor to bring the power factor of the parallel combination up to 0.93
A long hallway has three doors, one at each end and one in the middle. A switch is located at each door to operate the incandescent lights along the hallway. Label the switches A, B, and C.
Let x[n], y[n] and w[n] denote three finite-lenght sequences of lenghts N, M, and L, respectively with the first sample of each sequence occuring at n=0. What is the lenght of the sequence x[n] * y[n] * w[n]
Imagine a circuit consisted of two DC power sources of 12 volt and 10 volts. The negative terminals of these power sources are wired together. Assume that the positive terminals of these power sources are labeled as A and B respectively.
consumed from three phase network with phase to phase voltage 220 V an apparent power is (5+1.7) kVA .how big will be load's impedance for the one phase for scheme connected in the "star"
A 1 kHz sine wave signal with a power level -10 dBm is applied to the input of the amplifier. What is the power at the amplifier output?
A polar binary pulse are required with peak amplitude Ap= 1mV, the channel noise is rms 192.3 μV theshold detection not used. 1 & 0 are equally likely. Find the detection error probability. Also find the error probability for a)ON, OF.
in a balanced three-phase wye system the source is an abc-sequence set of voltage. the load voltage on the a phase is Van= 108.58
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