1 A Group Of Researchers Conducted An Experiment To Determine Which Vaccine Is More 2858721

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1.A group of researchers conducted an experiment to determine which vaccine is more effective for preventing getting the flu. They tested two different types of vaccines: a shot and a nasal spray. To test the effectiveness, 1000 participants were randomly selected with 500 people getting the shot and 500 the nasal spray. Of the 500 people were treated with the shot, 80 developed the flu and 420 did not. Of the people who were treated with the nasal spray, 120 people developed the flu and 380 did not. The level of significance was set at .05. The proportion of people who were treated with the shot who developed the flu = .16, and the proportion of the people who were treated with the nasal spray was .24. The calculated p value = .0008.

We have to research Is there any significant difference between two typres of vaccine i.e, a shot and nasal spray used for preventing nasal spray?

 
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1 According To The Ef Is The Human Population Living At Beyond Or Below The Earth S 2766987

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1. According to the EF, is the human population living at, beyond or below the Earth’s natural biocapacity? For how long has this been the case? Is this sustainable? (4 marks) 2. According to the EF, is the Chinese population living at, beyond or below China’s natural biocapacity? For how long has this been the case? Is this sustainable? (4 marks) 3. If you assume that EF grows at a constant yearly rate, what is the approximate slope of the EF relationship with time for China? And what is its units? Give the equation of, and sketch this line, with EF on the vertical axis and year on the horizontal axis. (EF for 2012 is 3.4 and for 1961 was approximately 1). (4 marks) 4. If you assume that biocapacity grows at a constant yearly rate, what is the approximate slope of the biocapacity relationship with time for China? And what is its units? Give the equation of, and sketch this line, with biocapacity on the vertical axis and year on the horizontal axis. (biocapacity for 2012 is 0.9 and for 1961 was approximately 1). (4 marks) 5. If this trend continues, what will EF and biocapacity be in 2050? (Hint: use your equation from questions 3 and 4.) What will biocapacity minus EF be in 2050? Will there be a deficit or reserve? (4 marks) 6. Use the data presented in Figure 1 to suggest a policy to make land use sustainable. (4 marks)
The model describes the evolution of a population over time ??. ??(??) = ??0?? (??-??)?? (1) where ??0 is the population at time ?? = 0. 1. If the initial population is ??0 = 2000, the annual birth rate ?? = 0.03 (3% exponential birth rate) and annual death rate ?? = 0.02 (2% exponential death rate), what is the population after 1 year? Explain this result. (4 marks) 2. Find an expression for the growth rate (population change) of the population in terms of time and the parameters. Hint: differentiating with respect to time gives a rate of change. (4 marks) 3. If ??
The model in equation (1) in Part A describes a population untouched by humans: there is no harvesting. We can model what happens if we harvest ?? individuals from the population each period. The unlimited population growth with harvesting model is given by ??(??) = ???? (??-??)?? + ??-???? (??-??)?? (??-??) (2) where ?? is the birth rate, ?? is the death rate, and ?? is the number of individuals taken from the population in each period. 1. Confirm that the rate of population change is ????(??) ???? = (?? – ??)??(??) – ??. (3) (5 marks) 2. Give the meaning of the expression in equation (3). (4 marks) 3. Let ??0 = ??(0) = 2000, ?? = 0.05 and ?? = 0.02. At what rate can the population be harvested sustainably? Hint: The sustainable harvest, ??, will be the value that causes no change in the overall population, i.e. ????(??) ???? = 0. (4 marks) 4. Suppose an ecosystem is being sustainably harvested at exactly its replacement rate, and the population is constant. Now suppose the population experiences a brief disease epidemic, which causes 4% of individuals to perish. What will happen to the population if harvesting continues at the same rate? (4 marks) 5. Suppose a population of fish that follows this model is being harvested sustainably, as before. What will happen in the long run if, one day, a fisherman decides to throw one of the fish back? (4 marks) 6. This type of model is often said to have a “knife-edge” equilibrium. Explain what this means. (4 marks) 7. Governments often levy fishing quotas in areas where populations are at risk. Does this model shed any light on the effectiveness (or otherwise) of these policies? (Hint: what if someone cheats?) (4 marks)
A model linking these ideas was first proposed by a French mathematician Pierre Verhulst in 1838. The Verhulst model can be written as: ??(??) = ??0?? ???? 1+ ??0(?? ????-1) ?? (4) where ??0 is the initial population level. For simplicity, we’ll write the net reproduction rate simply as ??, rather than in terms of births and deaths. 1. What is the growth rate if the initial population is zero? (4 marks) 2. When the population is initially at its carrying capacity, i.e. ??0 = ??, what is the population at time ??? How does the population level change when the growth rate r increases? (4 marks) 3. Differentiate (4) to show that the rate of population growth at time t is ????(??) ???? = ????(??) (1 – ??(??) ?? ) (5) Remember to use the quotient rule to differentiate (4). You will find it easier if you carefully look for the terms that you expect to see in the final expression, and factor those out. (5 marks) 4. Does the population grow faster when it is above the environment’s carrying capacity (N>K), or below it (??

Attachments:

V2.pdf

 
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1 A For The Circuit Shown In Figure 1 Sketch The Voltage Waveform Across The Seconda 2866555

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1. (a) For the circuit shown in FIGURE 1 sketch the voltage waveform across the secondary winding of the transformer. On the same diagram sketch the load voltage waveform. The sketches should take into account diode voltage drops. Indicate the following on the sketches: (i) when diodes are conducting and in what order (ii) when the capacitor is charging and discharging (b) With the aid of the above voltage waveform sketches, briefly explain the operation of the circuit. Document Preview:

(a) For the circuit shown in FIGURE 1 sketch the voltage waveform across the secondary winding of the transformer. On the same diagram sketch the load voltage waveform. The sketches should take into account diode voltage drops. Indicate the following on the sketches: when diodes are conducting and in what order when the capacitor is charging and discharging With the aid of the above voltage waveform sketches, briefly explain the operation of the circuit. T1 vSECONDARYDD1ESUPPLY2 D3D4 C1vCRL 10 : 1 FIG. 1 Teesside University Open Learning© Teesside University 2011 Created with an evaluation copy of Aspose.Words. To discover the full versions of our APIs please visit: https://products.aspose.com/words/ The source voltage for the power supply circuit shown in FIGURE 1 is mains, i.e. 230 V rms at a frequency of 50 Hz. Calculate the following for a load resistance of 25 ? and a smoothing capacitance of 1000 µF: rms and peak voltage across the secondary winding of the transformer the peak voltage across the capacitor the peak-to-peak and rms ripple voltages the load d.c. voltage and current. Model the power supply circuit using PSPICE and use the simulation to plot the load and ripple voltages, the current in the capacitor and a diode. Compare the waveforms with the values calculated above and attempt to account for any discrepancies. Briefly explain the function and operation of TR1, TR2, R1 and R1 in the circuit shown in FIGURE 2. R2 TR1 Created with an evaluation copy of Aspose.Words. To discover the full versions of our APIs please visit: https://products.aspose.com/words/ R1 TR2 Voltage regulator InOut Common Created with an evaluation copy of Aspose.Words. To discover the full versions of our APIs please visit: https://products.aspose.com/words/ VINRLOAD FIG. 2 Teesside University Open Learning© Teesside University 2011 Created with an evaluation copy…

Attachments:

em201852abd95….doc

 
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1 A What Is The Relationship If Any Between The Amount Shown In The Adjusted Trial B 1416007

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1.

a)

What is the relationship, if any,between the amount shown in the adjusted trial balance column for an account and that account and that account’s ledgerbalance?

 
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1 A Flat Turbine Agitator With A Disk Having Six Blades Is Installed In A Tank The T 2811351

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1. .A flat turbine agitator with a disk having six blades is installed in a tank. The tank diameter is1.83 m, the turbine diameter is 0.61 m, Dt = H, and the width W is 0.122 m. The tank contains four baffles, each having a width of J = 0.15 m. The turbine is operated at 90 rpm and the liquid in the tank has a viscosity of 10 cps and a density of 929 kg/m3. It is desired to design a small pilot plant unit with a vessel volume of 2 L so that the effects of various process variables on the system can be studied in the laboratory. The rates of mass transfer appear to be important in this system, so the scale down should be on this basis. Design the new system specifying sizes, rpm and power.
2.An ideal gas flows isetropically through a converging-diverging nozzle. At a section in the converging portion of the nozzle, A1= 0.1 m2, p1= 600 kPa (abs), T1= 20 ? C, and Ma1 = 0.6. For section (2) in the diverging part of the nozzle, determine A2, p2 and T2 if Ma2 = 3 and the gas is air.
3.Air is injected into a 50 m long horizontal pipeline (of 42 mm diameter) carrying a clay slurry of density 1452 kg/m 3. The rheological behaviour of the slurry follows the power-law model, with m = 5.55 Pa sn and n = 0.35. The volumetric flow rates of air and liquid are 7.48 and 1.75 m3/h, respectively. The air is introduced into the pipeline at 20°C and at a pressure of 1.2 bar. Ascertain the flow pattern occurring in the pipeline. Estimate (a) the average liquid holdup at the midpoint, (b) the pressure gradient for the two phase flow, (c) the maximum achievable drag reduction and the air velocity to accomplish it.

 
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1 A With Reference To The Phasor Diagram State What Is 2850138

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1. (a) With reference to the phasor diagram, state what is meant by the load angle of a synchronous motor. (b) What is the value of this angle when the motor runs on no-load? 2. (a) Sketch the curve of the power factor characteristic of a synchronous motor as the excitation current changes.
(b) (i) With reference to the curve in part (a), when the excitation is increasing initially state whether the power factor is leading or lagging.
(ii) Explain, with the help of a phasor diagram for one phase, briefly what happens as the excitation increases further.
3. Explain briefly with the aid of phasor diagrams, how the synchronous machine stator current can be varied if the load is constant.
4. (a) State and explain briefly the main methods of excitation of a synchronous induction motor.
(b) Identify which method of excitation is most commonly used in modern machines.

Attachments:

Synchronous-I….docx

 
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1 A Firm S Workforce Is On Average 20 Years Away From Retiring The Firm S Workers Su 2717400

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1. a firm’s workforce is on average 20 years away from retiring. The firm’s workers Suppose could find similar work in other companies earning $40,000 per year. Also, suppose that workers who shirk their work have a .30 chance of being dismissed.

a. For simplicity, assume that workers could find a job in an alternative company with no search costs. What would the firm have to pay to impose shirking costs of $60,000 on the average worker during his (her) work life expectancy? Show your work.

b. Find three salary-probability of dismissal combinations that would yield shirking costs of $60,000 for the average worker over his (her) work life expectancy.

2. Suppose a firm is considering installing cameras and using spy software on the computers at the office to monitor its workers in addition to hiring additional supervisors. The firm estimates that increasing the probability of catching workers who shirk by .01 costs the company $10,000 per year. For example, in the problem above when going from 0.30 to 0.31, it would cost the firm $10,000 per year. How much would the firm have to spend in order to impose shirking costs of $75,000 on its average worker? Show your work. Assume that

· the firm’s work force is on average 20 years away from retiring

· that the firm’s workers could find similar work in other companies earning $40,000

· that the company currently pays its workers $42,000

· and that the current probability of catching workers who shirk is 0.30,

 
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1 A The Fibonacci Numbers Are The Numbers In The Following Integer Sequence Called T 2739217

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1.(a) The Fibonacci numbers are the numbers in the following integer sequence, called the Fibonaccisequence, and are characterised by the fact that every number after the first two is the sum of the two preceding ones: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 114, … etc.

By definition, the first two numbers in the Fibonacci sequence are 0 and 1, and each subsequent number is the sum of the previous two. We define Fib(0)=0, Fib(1)=1, Fib(2)=1, Fib(3)=2, Fib(4)=3, etc. The first 22 Fibonacci numbers given below:

Fib(0)Fib(1)Fib(2)Fib(3)Fib(4)Fib(5)Fib(6)Fib(7)Fib(8)Fib(9)Fib(10)011235813213455Fib(11)Fib(12)Fib(13)Fib(14)Fib(15)Fib(16)Fib(17)Fib(18)Fib(19)Fib(20)Fib(21)89144233377610987159725844181676510946Write a MARIE program to calculate Fib(n), where the user inputs n. For example, if the user inputs 7, the program outputs the value 13; if the user inputs 15, the program outputs the value 610; if the user inputs 20, the program outputs the value 6765 etc. You need to write and run the program using MARIE simulator. Please include appropriate comments to make your code readable.[10 marks](b) For some values of n, your program will not produce correct results. You can check this by gradually increasing the values of n and checking for the correct outputs. What is the maximum value of n for which your program produces a correct result? Why? Please comment on this [5 marks].2.You are designing an instruction set for your computer. All the instructions are of same size (11 bits long). The size of an address field is 4 bits. You have already designed six 2-address instructions and 30 1-address instructions. How many 0-address instructions still you can fit? Justify your answer. [7 marks]3. Write codes to implement the expression: A= (B + C) * (D – E) on 3-, 2-, 1- and 0-address machines. In accordance with programming language practice, computing the expression should not change the values of its operands. [8 marks]Rationale

This assessment task covers topics on CPU operation and Instruction Set Architecture, and has been designed to ensure that you are engaging with the subject content on a regular basis. More specifically it seeks to assess your ability to:

  • be able to investigate the internal operation of the Central Processing Unit (CPU) and describe how it is used to execute instructions;
  • be able to investigate and describe in detail the essential elements of computer organisation including internal bus, memory, Input/Output ( I/O) organisations and interfacing standards and discuss how these elements function;

Marking criteriaCriteriaHD (85%-100%)DI (75%-84%)CR (65%-74%)PS (50%-64%)FL (0%-49%)Simulating and investigating of internal operations of CPU and it’s instruction executionThe code meets the specification. Code is well documented with comments. The program produces correct outputs in every input situations. Code meets specification and is well documented with comments. Minor errors in explanationse.Code meets specification. Most of the time produces correct results, however does not produce correct results for special inputs. Little documentation and comments.Code meets specification but has errors in operation. Little commenting. Basic idea is expressed by the codes and explanations.Code does not meet the specification. Comprehension of internal elements of computer organisationAnswers are corrects. All steps are correctly shown.All codes are accurately written.All answers are correct with a minor error. All codes are correct except a minor error.Few minor errors in calculating the address spaces. The steps show the clear understanding of the address space calculation.All codes written correctly however the order were not maintained correctly.The final result is not correct, however the calculations show the basic understanding of the instruction set architecture.More than half of the codes are correct.No attempt or incorrect calculations showing no or minimum understanding of the topic.Codes do not meet the specification.

Presentation

File naming convention: When you upload files to the TURNITIN for this subject, please use your student ID and Assignment number to name your files. For example, 123456_Assignment2.doc or 123456_Assignment2.mas (where 123456 is your Student ID)

Please also adhere to the following formatting rules:1. For Q1(a) you need to submit a *.mas file.2. Please compose the answers of 1(b), 2 and 3 in a document file (doc or docx format). Please do not submit in pdf formats. Please upload the document in the TURNITIN within deadline.
3. You may put the mas file and document file in a folder, compress the folder and upload the compressed file to the TURNITIN. You may also upload the two files separately.4. The first page (cover page) of the document file should have the following information clearly mentioned:a. Your full name
b. Your Student ID
c. Subject Code (ITC544)
d. Assessment item number and name (Assignment 2: MARIE & ISA)4. Each page should have page numbers in “page x of y” format (including the cover page).
5. You DO NOT need to provide any references for any of the questions.

 
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1 A Tiltrotor Aircraft Shown In Figure 1 A Is Both An Airplane And A Helicopter It C 3209538

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1. A tiltrotor aircraft shown in Figure 1-a is both an airplane and a helicopter. It can position its engine in a vertical position for takeoff and landing as a helicopter, and then rotate its engine 90 degrees to a horizontal configuration for cursing as an airplane. The altitude control system of the helicopter mode is shown in Figure 1-b. • Determine the root locus of this system as K varies between zero (0) and infinity (infinity). • Determine the range of K for a stable system • For K = 280, find the response y(t) to a unit step input r(t), and the corresponding Percentage overshoot (PO) and the settling time (T_s, with 2% criterion) • For K = 280, and r(t) = 0, find the response y(t) to a unit step disturbance 2. An arm of a space robot is shown in Figure 2-1 with its corresponding block diagram shown in Figure2-b. Perform the following tasks: • For a proportional controller Gc=Kp, determine the value of Kp such that the percentage overshoot P.O.-3%. • Plot the system response to a unit step input for the value of Kp determined in the previous task • Design a proportional -derivative controller (PD) using ITAE method with wn = 8 • Determine the required prefilter Gp(S). • Determine the system response to a step input after you add the PD and prefilter to the system. • Design a proportional-integral controller (PI) and a prefdilter using ITAE method. • Determine the system response to a step input after you add the Pi and prefilter to the system. • Design a proportional-integral-derivative controller (PID) and a prefilter using ITAE method such that the settling time T, <4 sec based on a 2% criterion. • What is your recommendation for the most appropriate controller among P, PD, PI, and PID for this system? TAs Controller Arm R- Gas) GO sEs+9 Fig 2-6 F’3 2-a Document Preview:

1

Attachments:

work–3-.pdf

 
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1 A Tower And A Monument Stand On A Level Plane The Angles Of Depression Of The Top 3599211

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1. a tower and a monument stand on a level plane . the angles of depression of the top and bottom of the monument viewed from the top of the tower are 13 degrees and 31 degrees respectively. the height of the tower is 145ft. find the height of the monument.

 
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