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How Particle Physics Is Improving Recommendation Engines | MIT Technology Review - 0 views

www.technologyreview.com/...proving-recommendation-engines

rival vs non-rival goods recommendation particle physics

shared by Kurt Laitner on 17 Jan 13 - No Cached

how to deal with recommendations for objects whose value diminishes with the number of people who use it.
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Clearly the resulting distribution of these different types of particles is entirely different.
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The analogy here is with goods that any number of people can share or that only one person can have.
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explore the space between these extremes
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a single object/state can be shared with a relatively small number of users/particles
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 Preventing oversubscription ensures that the population of users sample a wider range of DVDs, which in turn provides a broader range of recommendations.
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Retailers are not just interested in renting DVDs or selling books or whatever. They want to maximise profits.
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Kurt Laitner on 17 Jan 13

Interesting discussion of rival and nov-rival goods recommendations engine. Goes to scarcity vs abundance, how to manage deamnd for scarce goods.

<div class="cArrow"> </div><div class="cContentInner">Interesting discussion of rival and nov-rival goods recommendations engine. Goes to scarcity vs abundance, how to manage deamnd for scarce goods.</div>

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Open Source Completely 3-D Printable Centrifuge - Appropedia, the sustainability wiki - 0 views

www.appropedia.org/etely_3-D_Printable_Centrifuge

open science open hardware OSH catalog

shared by Tiberius Brastaviceanu on 10 Oct 23 - No Cached

Tiberius Brastaviceanu on 10 Oct 23

"Centrifuges are commonly required devices in medical diagnostics facilities as well as scientific laboratories. Although there are commercial and open source centrifuges, the costs of the former and the required electricity to operate the latter limit accessibility in resource-constrained settings. There is a need for low-cost, human-powered, verified, and reliable lab-scale centrifuges. This study provides the designs for a low-cost 100% 3-D printed centrifuge, which can be fabricated on any low-cost RepRap-class (self-replicating rapid prototyper) fused filament fabrication (FFF)- or fused particle fabrication (FPF)-based 3-D printer. In addition, validation procedures are provided using a web camera and free and open source software. This paper provides the complete open source plans, including instructions for the fabrication and operation of a hand-powered centrifuge. This study successfully tested and validated the instrument, which can be operated anywhere in the world with no electricity inputs, obtaining a radial velocity of over 1750 rpm and over 50 N of relative centrifugal force. Using commercial filament, the instrument costs about U.S. $25, which is less than half of all commercially available systems. However, the costs can be dropped further using recycled plastics on open source systems for over 99% savings. The results are discussed in the context of resource-constrained medical and scientific facilities."

<div class="cArrow"> </div><div class="cContentInner">"Centrifuges are commonly required devices in medical diagnostics facilities as well as scientific laboratories. Although there are commercial and open source centrifuges, the costs of the former and the required electricity to operate the latter limit accessibility in resource-constrained settings. There is a need for low-cost, human-powered, verified, and reliable lab-scale centrifuges. This study provides the designs for a low-cost 100% 3-D printed centrifuge, which can be fabricated on any low-cost RepRap-class (self-replicating rapid prototyper) fused filament fabrication (FFF)- or fused particle fabrication (FPF)-based 3-D printer. In addition, validation procedures are provided using a web camera and free and open source software. This paper provides the complete open source plans, including instructions for the fabrication and operation of a hand-powered centrifuge. This study successfully tested and validated the instrument, which can be operated anywhere in the world with no electricity inputs, obtaining a radial velocity of over 1750 rpm and over 50 N of relative centrifugal force. Using commercial filament, the instrument costs about U.S. $25, which is less than half of all commercially available systems. However, the costs can be dropped further using recycled plastics on open source systems for over 99% savings. The results are discussed in the context of resource-constrained medical and scientific facilities."</div>

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