Core rigidities

Leonard-Barton, D. 1992. Core capabilities and core rigidities a paradox in managing new product development. Strategic Management journal, 13 111-125. 

This confidence stems from a unique capability to co-evolve with the fluid IT environment within which Infosys operates. Continuity and change are inherent in Infosys s operations as it uses the very resources and capabilities it has built in the past as platforms to explore and exploit emerging opportunities. Scalability lies in Infosys s ability to encapsulate its past experiences such that the accumulated stock and associated flows result not in core rigidities - the perpetuation of Infosys as it once was - but in dynamic capabilities that fuel its continual transformation. That is, Infosys represents a continually upgradable platform, a firm that is always in the making. 

As has been elaborated elsewhere, activation energies measured for the thermal atropisomerization of these porphyrins and their metal complexes can be correlated with the degree of core rigidity and/or distortion from planarity for the different compounds (31) ... 

Antler Pale beige to grey Opaque Warm Central core May show core Rigid Chalky-blue... 

On the other hand, sand casting cannot be employed for thin sections or intricate shapes, and the dimensional accuracy and Mil face finish is usually poor. In many cases, and particularly with very large castings, erosion of the mould face by the molten metal causes serious difficulties. T o overcome these the majority of developments in sand casting have been aimed at increasing mould and core rigidity. 

Furan hot-box resins are used in both ferrous and nonferrous foundries (66,67). In this process, resin and catalyst are intimately mixed with dry sand and then blown into heated metal boxes containing a cavity the shape of the desired core. In seconds, the surface of the sand mass hardens and, as soon as the core has cured sufficiently to be rigid and handleable the box is opened and the core removed. Automotive cores with exceUent dimensional accuracy and high strengths are made via this forty-year-old process. 

Another PVC siding is an extmded product of an internally ribbed, dual-wall profile. A conventional screw extmder, with a vacuum sizer cooled with water and air, forms a product about 20 cm wide with 160 mm walls and 80 mm ribs on 25 cm centers. The total thickness is about 0.64 cm. The ribs provide rigidity and strength and the dual-wall constmction adds thermal insulation. No backing or core is used. 

Door and Window Frames and Sashes. The first successflil application of rigid PVC for windows was as a cladding over a wood core to avoid the need for painting and repainting the sash and the exterior of the frame. Since then, extmded profiles of rigid PVC have been developed to allow... 

Processes in which solids play a rate-determining role have as their principal kinetic factors the existence of chemical potential gradients, and diffusive mass and heat transfer in materials with rigid structures. The atomic structures of the phases involved in any process and their thermodynamic stabilities have important effects on drese properties, since they result from tire distribution of electrons and ions during tire process. In metallic phases it is the diffusive and thermal capacities of the ion cores which are prevalent, the electrons determining the thermal conduction, whereas it is the ionic charge and the valencies of tire species involved in iron-metallic systems which are important in the diffusive and the electronic behaviour of these solids, especially in the case of variable valency ions, while the ions determine the rate of heat conduction. 

The secondary structure elements, formed in this way and held together by the hydrophobic core, provide a rigid and stable framework. They exhibit relatively little flexibility with respect to each other, and they are the best-defined parts of protein structures determined by both x-ray and NMR techniques. Functional groups of the protein are attached to this framework, either directly by their side chains or, more frequently, in loop regions that connect sequentially adjacent secondary structure elements. We will now have a closer look at these structural elements. 

Tbe term structural foam was originally coined by Union Carbide to describe an injection moulded thermoplastic cellular material with a core of relatively low density and a high-density skin. The term has also been used to describe rigid foams that are load bearing. Today it is commonly taken to imply both of the above requirements, i.e. it should be load bearing and with a core of lower density than the skin. In this section the broader load-bearing definition will be used. Whilst structural foams are frequently made from polymers other than polystyrene, this polymer is strongly associated with such products and it is convenient to deal with the topic here. 

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