Dissimilar design

See Design Diversity and Dissimilar Design for additional related information. 

In multiple-version dissimilar software, a set of two or more computer programs are developed separately (and independently) to satisfy the same functional requirements. Errors specific to one of the versions should be detected by comparison of the outputs between the different versions. When multiple-version dissimilar software is used in redundant computer systems, the likelihood of the same errors in both systems is theoretically significantly reduced, thereby achieving a higher level of safety for the system. Multiple-version dissimilar software involves applying the dissimilar design concept to software. 

Even though the substrates are quite dissimilar, adhesive bonding of composite material is comparable to that of aluminum. Only aspects unique to composites will be discussed here. There are many details of composite part design, manufacture and performance that are not necessarily related to adhesive bonding that also will not be discussed. 

Dissimilar metals should be in contact (either directly or by means of a conductive path such as water, condensation, etc.) only when the functional design so dictates. 

The formation of crevices between dissimilar metals should be avoided. Corrosion at such connections is generally more severe than either galvanic or crevice corrosion alone. Also, crevices between metals and certain types of plastics or elastomers may induce accelerated rates of combined crevice and chemical attack. Testing is recommended prior to establishing final design specifications. 

Design —good design to minimise exposed dissimilar metal couples, radius sharp edges and avoid water traps. Allow for protection of mating faces. 

Great care must he exercised at wall-to-floor junctions and all changes of direction of walls and ceilings. In the case of a wall-to-floor junction, this will often occur at two dissimilar types of construction, i.e. preformed wall panels to in situ floor insulation. A satisfactory continuous vapour barrier needs careful design. 

Thus, it is necessary to allow for the fact that two widely dissimilar materials have been combined into a single unit. In the basic design approach certain fundamental assumptions are made. The first, and most important assumption, is that the two materials act together. With a load applied (stretching, compression, twisting, etc.) the fibers and plastic under load is the same that is, the... 

The life of equipment subjected to corrosive environments can be increased by proper attention to design details. Equipment should be designed to drain freely and completely. The internal surfaces should be smooth and free from crevasses where corrosion products and other solids can accumulate. Butt joints should be used in preference to lap joints. The use of dissimilar metals in contact should be avoided, or care taken to ensure that they are effectively insulated to avoid galvanic corrosion. Fluid velocities and turbulence should be high enough to avoid the deposition of solids, but not so high as to cause erosion-corrosion. 

These two seemingly dissimilar applications have a common basis—both are examples of the pressure-sensitive release of a chemical. How are these products designed Tiny spherical capsules (microcapsules or microspheres) with a glass or polymer shell are filled with a liquid core and glued onto paper. For a scratch-and-sniff ad, the core of the microcapsules contains a liquid with the desired scent for carbonless paper, a liquid ink or dye is encapsulated within the... 

Many suitable molecules can be designed, with end-groups chosen for SAM formation with dissimilar metal electrodes. For instance, two Au and one A1 electrode could be used. The molecule 0 2A would have two -SH terminations to bond to Au, and one -COOH end group (on D2) to bond to Al. The electron path between the two Au electrodes would traverse a donor moiety Dj with low IPD and an acceptor moiety A, while the path from the Al electrode to the second Au electrode would traverse a weaker donor moiety D2 (with larger IPd) and the common acceptor moiety A. The larger electron current would flow between the two Au electrodes, because the intra-molecular electron mobility would be larger Dj —> A, while the smaller electron current would flow D2 —> A. The smaller... 

Dissimilarity and clustering methods only describe the compounds that are in the input set voids in diversity space are not obvious, and if compounds are added then the set must be re-analyzed. Cell-based partitioning methods address these problems by dividing descriptor space into cells, and then populating those cells with compounds [67, 68]. The library is chosen to contain representatives from each cell. The use of a partition-based method with BCUT descriptors [69] to design an NMR screening library has recently been described [70]. 

---