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Facetted aluminium dendrites

Description

In this system, pro-eutectic aluminium dendrites form with facetted morphologies. Such morphologies are uncommon but are a consequence of the diluteness of the aluminium in the melt. The rest of the melt has solidified as a fine Al-Sn eutectic.

Subjects

alloy | aluminium | dendrite | eutectic | facet | facetted dendrite | metal | tin | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

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Concentration - Practice Questions

Description

Ten question interactive test on amount and concentration

Subjects

dilute | solution | medics | maths | amount | concentration | Biological Sciences | Medicine and Dentistry | Biological sciences | dentistry | C000 | A000

License

Attribution-Share Alike 2.0 UK: England & Wales Attribution-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-sa/2.0/uk/ http://creativecommons.org/licenses/by-sa/2.0/uk/

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Particle technology : dilute particle systems

Description

This open educational resource was released through the Higher Education Academy Engineering Subject Centre Open Engineering Resources Pilot project. The project was funded by HEFCE and the JISC/HE Academy UKOER programme.

Subjects

ukoer | engscoer | cc-by | engcetl | loughborough university | higher education | learning | loughboroughunioer | engineering | richard holdich | particles | particle technology | bsc | beng | meng | msc | stokes drag | terminal settling velocity | stokes settling equation | particle reynolds number | heywood tables | archimedes principle | industrial clarification | camp hazen settling basin | Engineering | H000

License

Attribution 2.0 UK: England & Wales Attribution 2.0 UK: England & Wales http://creativecommons.org/licenses/by/2.0/uk/ http://creativecommons.org/licenses/by/2.0/uk/

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Facetted aluminium dendrites

Description

In this system, pro-eutectic aluminium dendrites form with facetted morphologies. Such morphologies are uncommon but are a consequence of the diluteness of the aluminium in the melt. The rest of the melt has solidified as a fine Al-Sn eutectic.

Subjects

alloy | aluminium | dendrite | eutectic | facet | facetted dendrite | metal | tin | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Particle technology two phase flow rheology and powders

Description

This open educational resource was released through the Higher Education Academy Engineering Subject Centre Open Engineering Resources Pilot project. The project was funded by HEFCE and the JISC/HE Academy UKOER programme.

Subjects

particle technology | rheograms | pneumatic conveying | hydraulic conveying | powder flow | apparent viscosity | dodge and metzner | wilkinson equation | generalised reynolds number | dilute phase flow | saltation velocity | bulk density | mass flow | engscoer | ukoer | engcetl | loughborough university | loughboroughunioer | richard holdich | engineering | Engineering | H000

License

Attribution 2.0 UK: England & Wales Attribution 2.0 UK: England & Wales http://creativecommons.org/licenses/by/2.0/uk/ http://creativecommons.org/licenses/by/2.0/uk/

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RJN0000PC0059

Description

Mouth Pipetting (Java, Indonesia): An outdated method for plating, mouth pipetting these samples was particularly dangerous as they were diluted soil samples with anthrax spores. Chelsea, College of Veterinary Medicine, Cornell University, (www.vet.cornell.edu/) USA

Subjects

anthrax | zoonoses | biosecurity | laboratory | java | indonesia | cornell | usa | svmsvet | vph

License

http://creativecommons.org/licenses/by-nc-sa/2.0/

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RJN0000PC0059

Description

Mouth Pipetting (Java, Indonesia): An outdated method for plating, mouth pipetting these samples was particularly dangerous as they were diluted soil samples with anthrax spores. Chelsea, College of Veterinary Medicine, Cornell University, (www.vet.cornell.edu/) USA

Subjects

anthrax | zoonoses | biosecurity | laboratory | java | indonesia | cornell | usa | svmsvet | vph

License

http://creativecommons.org/licenses/by-nc-sa/2.0/

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Nottingham Vet School | FlickR

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Two phase flow, rheology and powder flow

Description

This open educational resource was released through the Higher Education Academy Engineering Subject Centre Open Engineering Resources Pilot project. The project was funded by HEFCE and the JISC/HE Academy UKOER programme.

Subjects

particle technology | rheograms | pneumatic conveying | hydraulic conveying | powder flow | apparent viscosity | dodge and metzner | wilkinson equation | generalised reynolds number | dilute phase flow | saltation velocity | bulk density | mass flow | engscoer | ukoer | engcetl | loughborough university | loughboroughunioer | richard holdich | engineering | non-newtonian | particles | Engineering | H000

License

Attribution 2.0 UK: England & Wales Attribution 2.0 UK: England & Wales http://creativecommons.org/licenses/by/2.0/uk/ http://creativecommons.org/licenses/by/2.0/uk/

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Economic Democracy: Degeneration and possible solutions

Description

As we have seen, degeneration is a real possibility as well as a theoretical one. So does this mean that the cooperative sector is doomed to remain marginal at best? The video looks at evidence that a number of countries have thriving worker cooperative sectors. But it would also be unwise on that basis to simply dismiss concerns about the viability of cooperatives. The video looks at the evidence that some of the problems facing cooperatives - particularly with regard to the creation of new ones - have been successfully solved by the institutional arrangements of the group of cooperatives in the Basque city of Mondragon in Spain. The approach in Mondragon has been to create a cooperative bank at the heart of the network of worker cooperatives. Pooling deposits from both cooperative employees and bank members from all over Spain, this institution is able to provide finance and technical assistance to people interested in setting up new cooperatives. Additionally, the group prevents various forms of degeneration by making it impossible for cooperative employees to sell their shares, and by limiting the proportion of the workforce that can be made up of hired, non-member workers (although it is also true that the latter proportions have been rising, reaching 30% and even in some cases 40% - a practice that threatens to dilute the cooperative character of the organization and lead to full-fledged degeneration if left unchecked).

Subjects

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Economic Democracy: External finance for conventional and labour-managed firms

Description

External finance for conventional and labour-managed firms The evidence from the US plywood cooperatives, Israeli Kibbutzim and the Mondragon cooperatives, bears out the key theoretical predictions of Block 3, namely that cooperatives need external finance to be viable in the long-term. We also know, from Block 3, that this presents a problem for cooperatives, and provides an explanation of the Pangloss Theorem. Conventional firms can issue a mixture of: debt (bonds) with a fixed rate of return, carrying no control rights, all risk borne by firm insiders, and equity (shares) with a dividend chosen by the firm, shareholders have control rights, risk is borne by shareholders with diversified portfolios. Conventional firms can choose the optimal degree of external finance, and allocate risk efficiently. This process gives control rights to outside owners (shareholders) as a quid pro quo for bearing risk. Cooperatives cannot use equity finance because it would dilute insiders' (i.e. workers') right to manage. Vanek (1975) and McCain (1977) showed in theory that these financing problems would disappear if the financial environment included a new type of financial asset called performance bonds. These are titles to a dividend, the amount of which varies with the firm's performance (e.g. value-added or income per worker). They carry no voting rights or other power to influence the firm's management. McCain (1977) speculates on a possible extension of his argument: "Suppose that the [performance] bonds are bought by some social agency such as a state or regional bank. The optimality of external finance with [performance] bonds means that the firm will willingly choose [an efficient financial structure]..." (Remarks in square brackets added.) We next consider how McCain's "social agency" might work in practice. References These articles discuss the external finance and performance bond arguments in some detail. They are quite technical and are not required reading for the course, but will be of interest to students with some background in economics. R McCain: (1977) On the optimal financial environment for worker cooperatives, Zeitschrift fur Nationalokonomie, vol. 37, 1977 Jaroslav Vanek (1975) The Basic Theory of Financing of Participatory Firms, in Self-Management: Economic Liberation of Man, (J Vanek, ed.), Penguin, 1975

Subjects

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