Joe Bruin has a big lawn in front of his house that is 30 meters wide and 20 meters long. Josephine makes him go out and mow the grass every weekend, so several years ago, he bought a fancy John Deere riding mower , which he loves to ride around his yard. The mower has a gasoline engine that is rated at 20 horsepower. To mow his lawn each week, Joe needs to use the mower for about 30 minutes, and the average power used by the mower during this period is 5 horsepower. Joe has a very healthy lawn that generates a lot of lawn clippings, and after doing the EPSS 101 biofuels lab, Joe gets the idea that 3 if he converted his mower to run on biofuelds instead of gasoline, then maybe he could use biofuels generated from his lawn clippings to power his mower

a. Calculate the weekly fuel energy requirements for Joe’s riding mower. (Hint. Don’t forget to include the efficiency of the mower’s internal combustion engine)

b. Calculate the chemical energy content of the clippings produced by Joe’s lawn each week, assume solar insolation is 5.62 kWH per square meter per day (Hint. Start with the amount of sunlight the lawn absorbs each week and then use the photosynthetic efficiency of corn to calculate the chemical energy content of the grass that grows each week)

c. Use your answer from Part b to calculate the mass of grass clippings produced by Joe’s lawn each week. Given that the density of grass clippings is 667 pounds per cubic yard, how many 50-gallon trash cans would be required to hold the clippings? (Hint: Convert the energy content you calculated for Part b to dry biomass content, and then assume that the grass clippings are 80% water)

d. Joe’s first idea is to use solar power to dry the grass clippings. Then, he would mod his riding mower to install a Stirling engine in place of the gasoline engine, and then power the engine by burning the grass clippings. Compare the fuel energy that could be provided by burning the grass clippings in this manner each week to the energy needs of Joe’s riding mower. Independent of the significant air pollution that would be generated by burning the clippings, would this scheme work? Could the clippings power Joe’s mower? Would there be any energy left over for other purposes?

e. Josephine works in a biology lab at UCLA and they have recently come up with a magic strain of bacteria that converts cellulose (the dominant organic component of grass clippings) into glucose. To create ethanol fuel, Joe and Josephine put the wet grass clippings into barrels, and then add an equal mass of water, plus a cup of the magic bacteria, and then they let it sit for two weeks while the cellulose is converted to glucose. Then, Joe takes the resulting glucose solution and adds yeast to ferment the solution to produce a 15% ethanol solution, which takes an additional week. Then, every week, he burns additional grass clippings in a large still to distill the 15% ethanol solution to create a 95% ethanol solution. The resulting distillate is clean-burning fuel, which Joe uses to power his riding mower, which he has, of course, modified to run on ethanol. Ignoring the fact that the magic strain of bacteria doesn’t really exist, will this scheme work? Would the clippings provide enough ethanol to power Joe’s mower? Would there be any additional ethanol left over for other purposes, like powering Joe’s car, or to create alcoholic beverages to 4 drink when Joe’s friends come over to watch UCLA football games on Saturday afternoons?

f. If Joe could find a way to use biofuels to power his mower, would this whole operation be sustainable? Discuss the needs of Joe’s lawn for water and nutrients. Discuss the demands on Joe’s time. Do you think Joe would have enough time to run his home biofuel operation and also have time to invite his friends over to watch football games on weekends?

§Take any two sectors (cement/ automobiles/ oil/ bottled drinking water, garments/ furniture/ refrigerators, etc) and draw their distribution/supply networks.

§ Comment on their supply chain uncertainty

§ Identify 4 or more supply chain metrics of each sector’s supply chain.

Draw/Paste supply chain network of sector-1

Draw/Paste supply chain network of sector-2

Supply Chain metrics Sector1 and 2

1- Create a life cycle inventory flow chart analysis for the steel. The document should have the following components including important data (amounts, percentages, etc.):

- material flows

- e*nergy use

- water use

- waste flows

The flow chart should besimilar to what we have in this link:

https://www.dropbox.com/s/6ndzh1hotdsewbe/life%20cycle%20inventory%20flow%20_1.pdf?dl=0

(please in print type)

(Torsion Expirement) strenght of materials (+200 words)

Describe the behavior of the material as it respond to increasing load. Pay special attention tot the region above the yield where linerar elastic theory no longer applies

Can you describe a physical life phenomena (not from your research – but you realize in your day to day life) which needs flux integral and concurrently the divergence theorem.

MCQ : Compressible flow

Nitrogen is escaping from a pressurized bottle (internal temperature 300 K, internal pressure 650 kPa) through an open valve that happens to be shaped like a converging-diverging nozzle, with an area ratio of 10 on the diverging side of the throat. What area ratio at the shock is required to get the exit pressure from the nozzle to equal atmospheric pressure (100 kPa)? (It’s a fairly complex calculation, so your answer may differ by 1 or 2 in the least significant figure shown.) a)1.53 b)8.32 c)8.67 d)9.62

MATLAB 2017b

The trajectory of a projectile is given by:

Write a program which will draw the trajectory for seconds. Make sure to label, title and grid your graph.

Please list and discuss 5 translational opportunities based on the research in designing football helmets to be safe and minimal brain impact injury.

What are some ways that professional collaborations can be managed to reduce the possibility of research misconduct?

Determine the critical resolved shear stress for an iron crystal which deforms by simultaneous slip on (110) [111], (110) [111], (110)[111], and (110) [111] when the tensile stress along [010] is 95.2 MPa. {Manual calculations perfectly OK. But it would be good to do this on a spreadsheet.}

One method in which gear tooth interference can be avoided is to lengthen the pinion teeth and shorten the gear teeth. A 12 tooth pinion with a diametral pitch of 2 teeth/in and a pressure angle of (φ = 20°) is to be meshed with a 60 tooth gear at a center distance of 18 inches. Calculate the maximum addendum length of the gear teeth if there is to be no interference. Then calculate the addendum length of the pinion which will give a contact ratio of 1.6 if the maximum addendum length of the gear is used.

Fluid Mechanics question:

Describe the processes in a wind turbine from a) the perspective of a system and b) from the perspective of a control system

What does Lean Manufacturing try to accomplish? How? Why? Where? When? What message don’t we want Lean to represent, Why? Why is visual management so important? Provide 3 examples from your personal experiences and what would occur if they did not exist?

Things never seem to slow down, particularly on your existing subsea project. While all this activity is going on with the new oil zones, SIT issues, you and your team have to keep up with the design, procurement, fabrication, testing and installation scope for the rest of the subsea project.

The latest problem involves the subsea connectors used throughout your project. Before you hired on, decisions were made to use an older model so-called legacy connection system, which had been used successfully in the past in this area by your company. This particular connection system had not been used in a long time by anyone, and although this connection system load capacities were known, there has been a change to the API Standards that require connector load capacities be re-calculated using different methods and factors. And while your new order for the old design connection system was progressing for your project, the revised design calculations were made, and they are sitting on your desk for review. As your luck would have it, to general surprise the calculations using the current methods proved the connector load capacities to be much smaller than previously shown in the legacy project documentation, which was all that your company had when the decision was made to use this system. Changing the connector system to a different design is a last resort, as it would delay the project by more than a year. You have been asked to investigate this and recommend an action plan.

Question 1. What are the minimum ten key concerns here, and what are your recommendations for how to approach this?