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CEE 5794: Env. Eng. Principles John LittleProblem Set #1 page: 1VIRGINIA TECHDepartment of Civil & Environmental EngineeringFall Semester, 2009Problem Set #1(1) Beginning with a mass balance about a control volume, derive the full transientsolution to the lake model outlined in class for the case with rapid exchange (i.e.,equilibrium exists) between the well-mixed water and a thin layer of well-mixedsediments. Show all your working clearly and state the principal assumptions involved.Using the data given in the table below, work the following problems:Lake volume, V 200 × 106 m3Surface area of lake, A 10 × 106 m2Throughflow of river water, Q 0.5 × 106 m3⋅d-1Constant concentration of PCE in inlet river water, Cin 5 × 10-4 g⋅m-3Constant concentration of PCE in air, y 2 × 10-6 g⋅m-3Overall mass transfer coefficient for PCE at 20oC, KOL 3 × 10-6 m⋅s-1Henry’s Law constant for PCE at 20oC, m 0.5Sediment/Water partition coefficient for PCE at 20oC, Kd 10-3 m3⋅kg-1(a) Begin by neglecting the sediment interaction and assuming that the lake is initiallyfree of PCE. Plot the concentration versus time curve for the lake. Calculate the steadystatelake concentration and the time to steady-state (assume 95% of steady-state value).By comparing the magnitude of the terms in the forcing function and the time constant,determine which are the controlling phenomena.(b) Now include sediment interaction in your calculations. Assume that the sedimentoccupies 0.1% of the volume of the lake, and has a density of 2,000 kg m-3. Was itreasonable to neglect the sediment interaction for PCE? What value of Kd is required forthere to be a doubling in the time to steady-state? For this value of Kd, draw theconcentration versus time curve on the previous plot.

 

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Now that you have conceptualized your project, it is time to add more details to your project by incorporating time and cost estimates. Specifically, you will use ProjectLibre to create a work breakdown structure (WBS), a Gantt chart, and estimate the cost for various components of your project.

Prior to beginning work on this learning activity, review the assigned page ranges in Chapters 5 and 7 in your textbook. This week’s lecture will provide examples and additional information that may help you complete this learning activity. Note that this learning activity requires you to make up several components, including names and hourly salaries of your team members, duration of each task, and cost estimation of other items. Be sure to watch the Microsoft Project Tutorial—Understanding the Critical Path (Links to an external site.)Links to an external site. to prepare for this activity.

  • Open ProjectLibre, and start creating your work breakdown structure (WBS). Your work breakdown structure should have a minimum of five tasks with 12 subtasks in all.
  • Once the WBS is complete, you will need to complete the timeline for your project (the Gantt chart). Creating the Gantt chart timeline and appropriate dependencies will show the overall timeline of the project. Some key steps are below. Please refer to the video sources in the required and recommended resource sections for additional assistance.
    • If you have not already done so, indent the subtasks in your work breakdown structure.
    • Assign an appropriate amount of time for each task and subtask.
    • Assign task dependencies. Note some tasks can be done in parallel and other tasks may have a firm start date.
  • Once the Gantt chart is complete, you will begin adding resources and cost to your project. Some key steps are listed below to assist you.
    • Move to “Resource” option in ProjectLibre.
    • Include real or fictitious names of project team members (create at least five) and their salary information.
    • Add two to three other cost-bearing elements in your project plan (i.e., rental expense for a hotel conference room, purchasing an overhead projector, meal expense, etc.).
    • Go back to the WBS layout in ProjectLibre. Add an additional column called “cost” so that you see the cost for each line item.
  • Print a professional screen shot to share
    • Format your screen and resize your columns so that all the columns are visible. Save your work, take a screen shot showing your WBS, cost for each task, and Gantt chart. Embed the screen shot in this discussion thread.
    • To maintain continuity, reattach the screen shot of “Section 1: Project Overview” from Week 2’s Project Planning: Project Scope Management Interactive learning activity.

Guided Response: In this learning activity, you will act as an executive, the project sponsor, and/or the project team and review your classmates work. Review at least two of your peers’ work in its entirety and provide feedback. Does the work breakdown structure (WBS) contain logical grouping of all the tasks? Are you able to follow the sequence of events listed under WBS? Are the task dependencies clearly reflecting in the Gantt chart? Are the proposed time estimates reasonable? Is the cost captured for every line item in the project? Are the proposed cost estimation looks reasonable? What questions or clarifications are needed for this work to be complete? Is the work clear? Does it pass the airport test discussed in the Week 1 lecture?

Think of your own work. What have you learned by reviewing your classmates’ work that you can use to improve your own work? Note the final assignment in this course is to create a Project Management Training Manual, and in this assignment, you will be providing completed and updated example of the work you have submitted in these learning activities. If you see updates needed in your work, it is recommended that you make them now.

Your replies should be at least 100 words and add to the class’s body of knowledge. Initial replies need to be made early in the course week to provide suggestions feedback to other students in a timely manner. Continue to monitor the discussion forum until 5:00 p.m. on Day 7 and respond with robust dialogue to anyone who replies to your initial post.

CAREFULLY READ THIS ASSIGNMENT !!!!! YOU NEED THE PROGRAM TO COMPLETE THIS PROJECT. YOU CAN DOWNLOAD IT FOR FREE. BELOW I AM GOING TO ATTACH THE PORTFOLIO YOUR GONNA BE WORKING FROM TO COMPLETE THIS ASSIGNMENT.

THIS IS NOT AN ESSAY ASSIGNMENT ITS A PROGRAM ASSIGNMENT.  READ MESSAGE ABOVE !!!!!!!!!!!!

 

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For a data set obtained from a random sample, n=25 and x=48.25.  It is known that ó=4.8

A. What is the point estimate of µ?  Round to two decimal places.

B. What is the margin of error of estimate for part b? Round to two decimal places.

C. Make a 95% confidence interval for µ.  What is the lower limit? Round to two decimal places.

D. Make a 95% confidence interval for µ.  What is the upper limit?  Round to two decimal places.

Determine the sample size (n) for the estimate of µ for the following.

A. E=2.3, ó=15.40, confidence level = 95%.  Round to the nearest whole number.

B. E=4.1, ó=23.45, confidence level = 90%.  Round to the nearest whole number.

C. E=25.9, ó=122.25, confidence level = 99%. Round to the nearest whole number

 

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Reaction Paper Instructions

After watching (Boyz in the Hood, American History X, and Scheindler’s List) write a reaction paper 

describing your personal reaction to the movie. Discuss how you reacted emotionally, morally/ethically, 

and intellectually; then describe any physical reaction you may have had, as well. What did you learn 

from the movie? What stereotypes did you share with characters in the movie? Were your stereotypes 

incorrect? Discuss them. Finally list the ways that this movie illustrates basic concepts we cover in class. 

You should be able to write two pages on this assignment.

 

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