Assuming that the number of newly infected cases and deaths of COIVD19 reached a flatten point at that time and the vaccines are started to be administered to students and teachers. Schools will reopen but probably in a very different way than what has normally been done.
Propose a model of a learning environment for the Intro to Engineering Design (IED) class that would provide students successful learning experience while still honoring the social distancing and safe practice.
â€¢ There are about 3 sections of IED with 32 students each.
â€¢ Students will have instant challenges, hands-on activities, team projects, individual assignments besides the lessons.
â€¢ They will also learn technical drawings, 3D modeling using an auto CAD software that is free for them to download and works with both PC and Mac.
â€¢ Students need to be at least 6 feet apart from one another, must wear some personal protective equipment (PPE)
â€¢ Budget (imaginary) is $10,000.
â€¢ The classroom size is approximately 20 ft x 40 ft x 10 ft and has 2 doors. Currently desktop computers are placed on the counters along 3 of the 4 walls around the room. There are 8 tables for group work in the middle of the room, each table can seat 4 students. All chairs and tables are on wheels.
â€¢ The design could be all virtual learning, all classroom, or a combination of both.
â€¢ Your model can be a drawing, a CAD design, a physical built structure, or a combination of those. You may use color pencils & markers, 3D model software, construction paper, lego, playdough, toy figures, cardboard, popsicle sticks, any materials available to you.
â€¢ Schedule, length of the class period, class size, and safety protocols are parts of the design.
A video presentation, of about 3 to 4 minutes, with the narration of details of the learning environment design, and the description and reason/purpose of each of its features.
â€¢ Design: 30 points (at least 5 detailed features with reason)
layer, the reaction mixture must be left overnight so overall this is a very time-consuming way of synthesising gold nanostructures.21 Another structure that has been proposed is gold chitosan nanocomposites (Zhang et al, 2012), in particular for application in photothermal therapy thanks to their absorption in the NIR region of the spectrum. The synthesis of these structures is detailed below. First, gold nanoparticles were synthesised using a one-step reaction, where 3mM sodium thiosulfate was quickly added to 1.71mM chloroauric acid, then vortexed for 20 seconds.22 Next, carboxymethylated chitosan to coat the gold nanoparticles was prepared according to the method reported by Chen et al (2003)23, by combining 10g of chitosan, 13.5g of sodium hydroxide and 100mL of solvent (20mL of deionised water and 80mL of isopropanol) in a 500mL flask for one hour. 15g of monochloroacetic acid was then dissolved using 20mL isopropanol, added slowly to the mixture in the flask over a period of 30 minutes, then left to react at ~60°C for four hours. Ethyl alcohol (80% purity) was used to bring the reaction to a halt and remove additional salt and water, before the product was vacuum-dried. A solution of carboxymethylated chitosan was prepared by dissolving 1g of the product in 100mL of deionised water. A stock solution was also prepared of chitosan, by dissolving 1g of chitosan with 100mL of water. The final step is to coat the gold nanoparticles with the chitosan and carboxymethylated chitosan, and purify them. This is achieved by centrifuging he chitosan and carboxymethylated chitosan solutions for ten minutes and dialysing for 48 hours. The three types of chitosan coated gold nanoparticles prepared were as follows: chitosan coated gold nanoparticles; carboxymethylated chitosan coated gold nanoparticles; chitosan/carboxymethylated chitosan coated gold nanoparticles. The appropriate chitosan solution was added to one of three solutions of gold nanoparticles, left to mix for a full day, and then centrifuged to remove impurities, unwanted components, and any excess chitosan. After centrifugation, the precipitate was suspended in deionised water.9 Compared to the previous method proposed by Gao et al, gold-chitosan nanocomposites are comparatively inexpensive to make – whilst the chloroauric acid is costly, the other materials required are of low cost and likely to be found in a typical laboratory; in particular chitosan is easy to come by and is widely used as a dietary supplement24. A low molecular weight of chitosan is also required, which contributes to a lower cost (as before, all other materials were priced assuming the highest purity would be required). The bare gold nanoparticles synthesised for the initial stage of the r>GET ANSWER