Development of postproduction machinery for Jatropha curcas seeds

submitted by: UP Los Baños

A report on the project to (1) develop a set of machinery for the following operations: (i) harvesting, (ii) husking, (iii) shelling, and (iv) cleaning, (2) design and develop a system for the proper (i) drying and (ii) storage of Jatropha seeds, and (3) test and evaluate the developed technologies.

Dr. Arnold R. Elepaño
Institute of Agricultural Engineering
College of Engineering and Agro-Industrial Technology
University of the Philippines Los Baños

Drying of poly(ethylene oxide) droplet viewed from beneath

submitted by: David Fairhurst
Drying of a 75μL droplet of 20% poly(ethylene oxide) solution in water, viewed from beneath using an inverted microscope (Nikon Eclipse TE2000-S) with 2x objective lens. The image measure 5mm across and the frame rate is increased by a factor of 300. The bright specks in the droplet are small clusters of polymer that would not dissolve, and help to visualise the flow within the droplet. Pinned drying (stage 1) occurs for the first 5 seconds, during which there is clear evidence for...

Drying of 40% poly(ethylene oxide) droplet

submitted by: David Fairhurst
Drying of a 75μL droplet of 40% poly(ethylene oxide) solution in water. The duration of the experiment was approximately 2 hours, the distance across the image approximately 10mm. Timings given below are given relative to the video, to aid identification of the various stages and processes. The droplet shows a very short stage 1, around 1 second. The contact angle increases until 3 seconds and bootstrap deposition (stage 3) continues until 4 seconds. However, there is still liquid inside...

Drying of 25% poly(ethylene oxide) droplet

submitted by: David Fairhurst
Drying of a 75μL droplet of 25% poly(ethylene oxide) solution in water. The duration of the experiment was approximately 2 hours, the distance across the image approximately 10mm. Timings given below are given relative to the video, to aid identification of the various stages and processes. The droplet exhibits stage 1 pinned drying for the first 5 seconds. However, the solid deposit is already much thicker for this droplet, than those with lower concentration. As the contact angle is...

Drying of 8% poly(ethylene oxide) droplet

submitted by: David Fairhurst
Drying of a 75μL droplet of 8% poly(ethylene oxide) solution in water. The duration of the experiment was approximately 2 hours, the distance across the image approximately 10mm. Timings given below are given relative to the video, to aid identification of the various stages and processes. The droplet exhibits pinned drying (stage 1) for around the first 5 seconds, at which point the contact line depins and the droplet undergoes a dewetting transition (stage 2) until 9 seconds. At this...

Drying of 5% poly(ethylene oxide) droplet

submitted by: David Fairhurst
Drying of a 75μL droplet of 5% poly(ethylene oxide) solution in water. The duration of the experiment was approximately 2 hours, the distance across the image approximately 10mm. Timings given below are given relative to the video, to aid identification of the various stages and processes. The droplet exhibits pinned drying (stage 1) for around the first 5 seconds, before depinning when the contact angle becomes lower than the measured receding contact angle. Stage 2 and bootstrap...

Biology of Algae

submitted by: scivee-team

An overview of the biology of algae and microorganisms.