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UNIVERSALS [6 records]

Record 1 2008-05-28

English

Subject field(s)
  • Machine-Tooling (Metallurgy)
  • Automatic Control (Machine Tools)
CONT

The Stewart platform consists of two plates connected by six mobile and extensible legs. The lower or base plate is immobile. The upper or mobile plate has six degrees of freedom, three rotational and three translational. The platform is highly stable and easy to control. The platform's six legs each have two parts, an upper and a lower leg, with a piston-like cylindrical DoF between each pair of parts. The legs are connected to the base plate and the top plate by universal joints at each end of each leg.(These universals are not just sets of abstract DoFs. Each also contains a spider-like body, while also having two DoFs.) The upper part of each leg can slide into and out of the lower leg, allowing each leg to be varied in length. The position and orientation of the mobile platform(top plate) varies depending on the lengths to which the six legs are separately adjusted. Once the top is connected to the legs, the entire Stewart platform assembly has 36 DoFs. Only six DoFs are independent, the same as the top plate would have if it were disconnected. You can think of these independent DoFs as the six adjustable leg lengths or as equivalent to the six DoFs of the mobile plate.

OBS

Geodetic Technology trademarked "hexapod" for a Stewart platform in a machine tool context. However, apparently this has not stopped other machine tool manufacturers from using the term. A Free CNC software package, the Enhanced Machine Controller (EMC) [1] is capable of driving a stewart platform using standard G-codes such as used for milling machines, etc.

French

Domaine(s)
  • Usinage (Métallurgie)
  • Commandes automatiques (Machines-outils)
CONT

La plateforme de Stewart [...] est un type de robot parallèle constitué de six actionneurs. Elle a six degrés de liberté : les trois coordonnées de translation ainsi que les angles de tangage, roulement et lacet (Angles d'Euler). Les six jambes sont actionnées pour changer de longueur et [faire] varier l'orientation de la plateforme [...]

OBS

Les plateformes de Stewart ont des applications dans la technologie des machine-outils et des grue, la recherche sous-marine, la simulation de vol, les antennes paraboliques, les télescopes et la chirurgie orthopédique.

Spanish

Save record 1

Record 2 2005-12-01

English

Subject field(s)
  • Security Devices
  • CBRNE Operations
CONT

... to mutually develop a commercially available bio-terror "smoke" detector, which will combine the ... spore detection technology with Universal’s aerosol capture device ...

French

Domaine(s)
  • Dispositifs de sécurité
  • Opérations CBRNE

Spanish

Save record 2

Record 3 2000-03-20

English

Subject field(s)
  • Philosophy (General)
DEF

The principles of the Nominalists, a sect of philosophers in the Middle Ages who argued that universals, or the terms used to note the genera or species of things, are not proper designations of things that exist but as mere names for the resemblances and evidences of things. This sect founded the University of Leipzig.

French

Domaine(s)
  • Philosophie (Généralités)
DEF

Doctrine pour laquelle l'idée générale n'est rien d'autre que le nom ou le terme qui la désigne.

Spanish

Save record 3

Record 4 1998-07-17

English

Subject field(s)
  • Management Theory
DEF

Management theory that the three universals interacting in any organization are a people; b production or goods or services(the theory is not limited to manufacturing organizations, and the services might be either those sold to a customer or those provided for other parts of the organization) ;and c the management hierarchy. A practical demonstration of grid theory is in the managerial grid.

French

Domaine(s)
  • Théories de la gestion

Spanish

Save record 4

Record 5 1991-06-04

English

Subject field(s)
  • Management Operations (General)
  • Management Theory
  • Training of Personnel
DEF

Developed by R. R. Blake and J. S. Mouton, this is a graphic illustration of the two opposing universals in managerial attitudes and behavior patterns, one being a "concern for people" and the other a "concern for production or services. "It may be used as a base for review, analysis, evaluation and discussion in terms of one's own attitudes and behavior with the objective of working toward possible integration of the two opposing concerns in training for better leadership, management, business, teamwork or intergroup relations skills.

French

Domaine(s)
  • Opérations de la gestion (Généralités)
  • Théories de la gestion
  • Perfectionnement et formation du personnel
OBS

Représentation schématique imaginée par R.-R. Blake et J.-S. Mouton, montrant les possibilités de concilier les deux principaux styles du management : celui des tenants de l'école de la gestion scientifique, et celui des tenants de l'école des relations humaines. En exposant toutes les orientations que le management peut prendre, cette grille exprime comment en dégager des styles de management plus nuancés. La grille tient compte de ce que les diverses théories du management ne diffèrent finalement que par la manière dont elles combinent deux caractéristiques essentielles, deux "dimensions", à savoir : le degré d'intérêt porté par la Direction de l'entreprise aux problèmes humains, d'une part, le degré d'intérêt porté aux impératifs de la production, d'autre part.

Spanish

Save record 5

Record 6 1989-12-01

English

Subject field(s)
  • Diachronic Linguistics and Etymology

French

Domaine(s)
  • Linguistique diachronique et étymologie

Spanish

Save record 6

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