Contol of HIV/AIDS. As of 2012. the number of people living worldwide with Human Immunodeficiency Virus/Acquired Immune Deficiency Syndrome (HIV/ AIDS) was estimated at 35 million. with 23 million new infections per year and 1.6 million deaths due to the disease {UNAIDS, 2013). Currently there is no known cure for the disease, and HIV cannot be completely ehminated in an infected individual. Drug combinations can be used to maintain the virus numbers at low levels, which helps prevent AIDS from developing. A common treatment for HIV is the administration of two types of drugs: reverse transcriptase inhibitors (RTIs) and protease inhibitors (PIs). The amount in which each of these drugs is administered is varied according to the amount of HIV viruses in the body (Craig, 2004). Draw a block diagram of a feedback system designed to control the amount of HIV viruses in an infected person. The plant input variables are the amount of RTIs and PIs dispensed. Show blocks representing the controller, the system under control, and the transducers. Label the corresponding variables at the input and output of every block.
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Control Systems Engineering
- Macro farms Ltd can purchase two types of fertilizer which contain the following percentage Nitrate Phosphate Potash Type X 18 5 2 Type Y 3 2 5 For certain type of crop, the following minimum quantities (kg) are required Nitrate Phosphate Potash 100 50 40 Type X cost GHS10 per kg and type Y cost GHS5 per kg. The company currently buys 1,000 kg of each type and wishes to minimize it expenditure on fertilizers.Required 1. What is the minimum expenditure that can be incurred on fertilizer? 2. Find the savings the company can make by switching from it current policy to your recommendation.arrow_forwardCalorimeters are devices that are commonly used to measure the heating value of fuels. For example, a Junkers flow calorimeter is used to measure the heating value of gaseous fuels. A bomb calorimeter, on the other hand, is used to measure the heating value of liquid or solid fuels, such as kerosene, heating oil, or coal. Perform a search to obtain information about these two types of calorimeters. Write a brief report discussing the principles behind the operation of these calorimeters.arrow_forwarde IY: %VY OLD ? د ميکانيك شهري 2021.pdf UNIVERSITY OF BASRAH - COLLEGE OF ENGINEERING DEPARTMENT OF CIVIL ENGINEERING Subject: Engineering Mechanics-Static Class: 1st year, 1st term Exam. : Semester Date: 16/3/2021 Examiner: Dr. Mazin, Dr. Aqeel, Dr.Ahid and Dr.Jaffar Time: 1.5Hours Q1] (10 Marks) A- In Fig.A , If the resultant force acting on the bracket is to be 642 N directed along the positive x axis, determine the magnitude of F. B- In Fig.B , Determine the magnitude of the resultant force acting on the screw eye and its direction measured clockwise from the x axis. C- In Fig.C , Resolve the 100N force into components along the u and v axes, and determine the magnitude of each of these components. D- In Fig.D, Determine the moment of the force about point O. 300 N 60N 25° 32 45° 60° 505 N 50° 40N Fig. A 50 N Fig. B 400 N 100N 28° 18 2.12 m Fig. C 2.12 m Fig.D Q2] (10 Marks) A- In Fig.A , Replace the loading system by an equivalent resultant force and specify where the resultant's…arrow_forward
- At 250C, the interfacial tension between water and n – octyl alcohol is 8.50 dyne/cm. if the surface tension of n-octyl is 27.53 dyne/cm and that of the water is 72.75 dyne/cm, predict whether water spreads on the alcohol by calculating a) Work of cohesion of n-octyl b) Work of adhesion and c) the spreading coefficient of water on the alcohol. Will alcohol spread on water?arrow_forwardProblem 1: (50 points) In Avengers 2, Captain America's improved shield is made from unobtainium, a new material that will soon be available in a store near you. Unobtainium has the normal stress- strain diagram shown. The proportional limit, the elastic limit and the yield point are identical in this material. o [MPa] 2001 175 150 125 100 Fig.1 Normal stress-strain 75 50 25 0 0. 0.05 0.1 0.15 0.2 0.25 Unobtainium has a Poisson's ratio of 0.3. a. [6pts] Identify the yield point oy, the ultimate stress ou and the fracture stress of. Include units. c. [25pts] A bar of unobtainium has a length of 1.5 m, a width of 100mm and a height of 50 mm, as shown. The cross-sectional area is 50mm 100mm = 5 x 10-³m². The bar is subjected to an axial force of 375 kN. Find the normal stress in a cross-section of the bar. b. [5pts] How do you find Young's modulus from this graph? Find its value with units. whesta fins dus al hoss P = 375 KN 1.5 m 0.3 50 mm 100 mm & [mm/mm] Is the material within its…arrow_forwardHobe Acrobat Pro omments Forms Tools Advanced Window Help Sign E Forms - Multimedia Comment Collaborateiim Secure A 8 (2 of 114) SUR 8O 122% Find ions 44918h/21/ 1709 12:01 PM Page 8 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. 2-2. If 0 = 60° and T= 5kN, determine the magnitude of the resultant force acting on the eyebolt and its direction measured clockwise from the positive x axis. T 8 kN The parallelogram law of addition and the triangular rule are shown in Figs. a and b, respectively. Applying the law of cosines to Fig. b, Fr =52+ g2arrow_forward
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- The population of a community is known to increase at a rate proportional to the number of people present at time t. If an initial population P, has doubled in 7 years, how long will it take to triple? (Round your answer to one decimal place.) yr How long will it take to quadruple? (Round your answer to one decimal place.) yr еВookarrow_forwardالمزید äs jliis OWES .. elaiyls – DROPBOX X IMG 20210429 11...7.jpg ... For conservative system: Select one: O the work may be constant O both radial and transverse forces should be conservative forces O the force should be tangential O the force should be central O the angular momentum should be constant 16 of 17arrow_forwardYou are developing a porous membrane for use in a dialysis system. The membrane must be able to retain both protein and glucose on the inlet side and allow other, smaller molecules to flow through. You have found that the membrane is 0.25 mm thick and contains long, rectangular pores with a width of 0.1 microns. 57% of the 50 cm^2 membrane surface area is covered with pores. A test fluid (viscosity = 1.5 cP, density = 1015 kg/m^3) is passed through the membrane. You can assume that the test fluid has a composition similar to that of blood plasma. An initial test is run at physiological conditions, and you observe that the flow rate of fluid through the membrane is 500 cm^3/min. Given this data, what must the hydrodynamic pressure drop across the membrane in your test system be in pascals?arrow_forward
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