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Tiberius Brastaviceanu

Open Source 3-D Printed Nutating Mixer - Appropedia, the sustainability wiki - 0 views

www.appropedia.org/rce_3-D_Printed_Nutating_Mixer

open science open hardware OSH catalog

shared by Tiberius Brastaviceanu on 10 Oct 23 - No Cached
  • Tiberius Brastaviceanu on 10 Oct 23
     
    "As the open source development of additive manufacturing has led to low-cost desktop three-dimensional (3-D) printing, a number of scientists throughout the world have begun to share digital designs of free and open source scientific hardware. Open source scientific hardware enables custom experimentation, laboratory control, rapid upgrading, transparent maintenance, and lower costs in general. To aid in this trend, this study describes the development, design, assembly, and operation of a 3-D printable open source desktop nutating mixer, which provides a fixed 20° platform tilt angle for a gentle three-dimensional (gyrating) agitation of chemical or biological samples (e.g., DNA or blood samples) without foam formation. The custom components for the nutating mixer are designed using open source FreeCAD software to enable customization. All of the non-readily available components can be fabricated with a low-cost RepRap 3-D printer using an open source software tool chain from common thermoplastics. All of the designs are open sourced and can be configured to add more functionality to the equipment in the future. It is relatively easy to assemble and is accessible to both the science education of younger students as well as state-of-the-art research laboratories. Overall, the open source nutating mixer can be fabricated with US$37 in parts, which is 1/10th of the cost of proprietary nutating mixers with similar capabilities. The open source nature of the device allow it to be easily repaired or upgraded with digital files, as well as to accommodate custom sample sizes and mixing velocities with minimal additional costs."
Francois Bergeron

iWorx :: Organ/Tissue Bath Systems - 0 views

www.iworx.com/content

hardware medical instrument company

shared by Francois Bergeron on 14 Jun 11 - No Cached
  • iWorx offers 4-channel (M4) or single-channel (M1) Myograph systems from Radnoti Glass Technology. These systems are designed for researchers performing contractile force studies on small ring samples with sizes ranging from 60 mm to over 1 mm in diameter. Examples include mouse aortic rings and small intestinal ring samples as well as micro-vessel preparations like mesenteric arteries.The Myograph systems include myograph chambers with transducers and amplifiers, a base with sliding wrist rest, temperature controllers, stands, tubing kits and all other essential items to conduct an experiment.iWorx offers a myograph normalization module (LS-20NM) which calculates the optimal pretension settings for each sample prior to conducting an experiment.
Kurt Laitner

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.
  • Clearly the resulting distribution of these different types of particles is entirely different.
  • The analogy here is with goods that any number of people can share or that only one person can have.
  • ...4 more annotations...
  • explore the space between these extremes
  • a single object/state can be shared with a relatively small number of users/particles
  •  Preventing oversubscription ensures that the population of users sample a wider range of DVDs, which in turn provides a broader range of recommendations.
  • Retailers are not just interested in renting DVDs or selling books or whatever. They want to maximise profits.
  • 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.
Francois Bergeron

Mirroring Plastics - silver or "spray chrome" plastic and non-glass substrates - 0 views

angelgilding.com/Mirroring_Plastics.html

shared by Francois Bergeron on 08 Sep 11 - No Cached
  • Plastic can be as glossy as glass but, unlike glass, it is hydrophobic – it repels water. If water does not flow smoothly over the surface, the mirroring chemicals will not deposit evenly. There are two ways to overcome this problem: You can flood the surface with so much water (or mirroring chemicals) that the beads merge into a smooth sheet. This technique works best using our mirror bath technique where the object to be mirrored is submerged in the chemicals. It is only practical for small objects. You can use a wetting agent (a type of surfactant) to break the surface tension on the plastic before you apply the mirroring chemicals. There are many types of plastic and each type has its own chemistry and surface characteristics. We have tested our Wetting Agent on some types of acrylic, polycarbonate and polyurethane. We have not tested it on all types of plastic. You should test it on a sample of your substrate to confirm that it works. See Cleaning and Polishing for more information on wetting agents.
  • Effect of Wetting Agent on Plexiglas®
Kurt Laitner

Forget the Foundations - In These Times - 0 views

inthesetimes.com/...forget_the_foundations

Madonna Thunderhawk financing foundation activism paper

shared by Kurt Laitner on 06 Jun 14 - No Cached
  • Their “actions” didn’t involve writing grant proposals, discussing their concerns with a board of directors or contacting state agencies. They tested water samples themselves, and, in 1979, produced a study revealing high levels of radioactive contamination, a high percentage of pregnancies complicated by excessive bleeding or terminated in abortion and large numbers of children born with birth defects. Despite their work, the Centers for Disease Control and Indian Health Services discredited the study, and WARN wasn’t vindicated until the South Dakota School of Mines substantiated their claims that same year.
  • But unlike Erin Brockovich, this tale of local activists fighting against faceless institutions doesn’t have a happy ending: The Nuclear Regulatory Commission simply raised the level of “acceptable contamination,” and Indian Health Services started providing bottled water in one area. Congress authorized a new water pipeline to the reservation in 2002–only to have the funding diverted by the financial demands of the wars in Iraq and Afghanistan.
  • who defer responsibility onto do-nothing organizations, only later to complain about their lack of agency
  • ...12 more annotations...
  • that foundations perpetuate First World interests and free-market capitalism, thus preserving many of the problems radical activists wish to eradicate, such as the unregulated concentration of wealth.
  • Foundations were created in the early 20th century by multimillionaire robber barons, such as John D. Rockefeller and Andrew Carnegie, to evade corporate and estate taxes.
  • foundations divert money away from the collective tax base
  • who are more interested in supporting milquetoast reformers than social-justice organizations
  • federal and state funding for education and healthcare has shrunk
  • This is a culture of noblesse oblige, Ahn writes, where the “privileged are obliged to help those less fortunate, without examining how that wealth was created or the dangerous implications of conceding such power to the wealthy.”
  • is the power those with money wield over community leaders.
  • consequently realigning their interests (i.e., maintaining their jobs) with maintaining the system
  • This allegiance keeps community leaders from challenging the root causes of social inequities–the social-change work–at the same time that they pedal to keep up by providing for the needs of individuals devastated by institutional exploitation.
  • Kivel concedes this is valuable work, but points out the inherent injustice of this paradigm: “When temporary shelter becomes a substitute for permanent housing, emergency food a substitute for a decent job … we have shifted our attention from the redistribution of wealth to the temporary provision of social services to keep people alive.”
  • University of Southern California Professor Ruth Wilson Gilmore urges contemporary grassroots activists to stop seeking a “pure way of doing things.” “Many are looking for an organizational structure and a resource capability that will somehow be impervious to co-optation,”
  • transitioning from foundation support to a volunteer collective reliant solely on grassroots dollars
Kurt Laitner

The Link Economy and Creditright - Geeks Bearing Gifts - Medium - 3 views

medium.com/...y-and-creditright-95f938b503be

contributory value accounting dimVal *jeffjarvis creditright

shared by Kurt Laitner on 07 May 15 - No Cached
  • Online, content with no links has no value because it has no audience
  • News Commons used Repost as the basis of a content- and audience-sharing network among dozens of sites big and small in the state’s new ecosystem
  • Huffington Post and Twitter can get thousands of writers — including me — to make content for free because it brings us audience and attention.
  • ...25 more annotations...
  • Consider an alternative to syndication. I’ll call it reverse syndication. Instead of selling my content to you, what say I give it to you for free? Better yet, I pay you to publish it on your site. The condition: I get to put my ad on the content. I will pay you a share of what I earn from that ad based on how much audience you bring me.
  • That model values the creation of the audience
  • If content could travel with its business model attached, we could set it free to travel across the web, gathering recommendations and audience and value as it goes
  • She searched Google for “embeddable article” and up came Repost.us, already created by entrepreneur and technologist John Pettitt. Repost very cleverly allowed embeddable articles to travel with the creator’s own brand, advertising, analytics, and links.
  • First, he found that the overlap in audience between a creator’s and an embedder’s sites generally ran between 2 and 5 percent. That is to say, the embedders brought a mostly new audience to the creator’s content.
  • Instead, Pettitt found that click-through ran amazingly high: 5 to 7 percent — and these were highly qualified clicks of people who knew what they were going to get on the other side of a link
  • I call this creditright. We need a means to attach credit to content for those who contribute value to it so that each constituent has the opportunity to negotiate and extract value along the chain, so that each can gain permission to take part in the chain, and so that behaviors that benefit others in the chain can be rewarded and encouraged
    • Kurt Laitner
      Kurt Laitner on 07 May 15
       
      so *net basically, or OVN contributory value accounting
  • Each creator’s ads traveled with its content — though that wasn’t necessarily optimal, because an ad for a North Jersey hairdresser wouldn’t perform terribly well with South Jersey readers brought in through embedding.
  • key factor in its failure: Repost could find many sites willing and eager to make their content embeddable. It didn’t find enough sites to embed the content.
  • But the embedders got nothing aside from the free use of content — content that was just a link away anyway
  • Our ultimate problem in media is that we do not have sufficient technical and legal frameworks for alternate business models.
  • That formula was the key insight behind Google: that links to content are a signal of its value; thus, the more links to a page from sites that themselves have more links, the more useful, relevant, or valuable that content is likely to be
  • Silicon Valley’s: Those people are your fans who are bringing value to you by sending you audiences and by contributing their creativity, and you’d be wise to build your businesses around making it easier, not harder, for them to get and share your content when and how they want it.
  • And so, we came to agree that we need new technological and legal frameworks flexible enough to enable multiple models to support creativity.
  • Hollywood’s side: People who download our content without buying it or who remix it without our permission — and the platforms that facilitate these behaviors — are stealing from us and must be stopped and punished.
  • Imagine you are a songwriter. You hear a street poet and her words inspire you to write a song about her, quoting her in the piece. You go to a crowdfunding platform — Kickstarter, Indiegogo, or Patreon — to raise money for you to go into the studio and perform and distribute your song. Another songwriter comes along and remixes it, making a new version and also sampling from others’ songs. Both end up on YouTube and Soundcloud, on iTunes and Google Play. Audience members discover and share the songs. A particularly popular artist shares the remixed version on Twitter and Facebook and it explodes. A label has one of its stars record it. The star appears on TV performing it. A movie studio includes that song in a soundtrack. There are many constituents in that process: the subject, the songwriter, the patrons, the fans, the remixer, the distributor, the label, the star, the show, the studio, and the platforms. Each contributed value.
  • Each may want to recognize value — but not all will want cash. There are other currencies in play: The poet may want credit and fame; the songwriter may want to sell concert tickets; the patrons may want social capital for discovering and supporting a new artist; the remixer may want permission to remix; the platforms may want a cut of sales or of subscription revenue; the show may want audience and advertising; the studio will want a return on its investment and risk.
  • I’ve suggested they would be wiser to seek another currency from Google: data about the users, helping build better services for readers and advertisers and thus better businesses
  • We will need a way to attach metadata to content, recording and revealing its source and the contributions of others in the chain of continuing creation and distribution.
  • We need a marketplace to measure and value their contributions and a means to negotiate rewards and permissions
  • We need payment structures to handle multiple currencies: data as well as money
  • And we need a legal framework to allow the flexible exploration of new models, some of which we cannot yet imagine.
  • It took many more years for society to develop principles of free speech to balance the economic and political interests of those who would attempt to control a new tool of speech.
  • We must reimagine the business of media and news from the first penny, asking where value is created, who contributes to it, where it resides, and how to extract it
  • Thus, we need new measures of value
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