Several condensed matter systems are being studied with potential applications to quantum computation, including experimental systems like quantum dots, SQUIDs, and theoretical models like the toric code and the quantum dimer model.

Several competing models, although correctly dealing with the conformation of each individual peptide chain, gave way to the triple-helical " Madras " model, which provided an essentially correct model of the molecule's quaternary structure although this model still required some refinement .< ref > The packing structure of collagen has not been defined to the same degree outside of the fibrillar collagen types, although it has been long known to be hexagonal or quasi-hexagonal.

Several experimental treatments have shown promise in animal models.

Several three-cylinder, two-stroke-cycle models were built while most engines had straight or in-line cylinders.

* Several models of participation are possible: firstly, a model in which the employees form part of the supervisory board or of the administrative board, as the case may be ; secondly, a model in which the employees are represented by a separate body ; and finally, other models to be agreed between the management or administrative boards of the founder companies and the employees or their representatives in those companies, the level of information and consultation being the same as in the case of the second model.

Several models of " simplified English " have been suggested for teaching English as a foreign language:

Several companies were building and selling Lisp Machines in the 1980s: Symbolics ( 3600, 3640, XL1200, MacIvory and other models ), Lisp Machines Incorporated ( LMI Lambda ), Texas Instruments ( Explorer and MicroExplorer ) and Xerox ( InterLisp-D workstations ).

Several computational models of vocabulary acquisition have been proposed so far.

Several models have been proposed for understanding the activities required to manage material movements across organizational and functional boundaries.

Several other minor refinements were made to stethoscopes, until in the early 1960s Dr. David Littmann, a Harvard Medical School professor, created a new stethoscope that was lighter than previous models and had improved acoustics.

Several economic models exist for vegetable farms: farms may grow large quantities of a few vegetables and sell them in bulk to major markets or middlemen, which requires large growing operations ; farms may produce for local customers, which requires a larger distribution effort ; farms may produce a variety of vegetables for sale through on-farm stalls, local farmer's markets, u-pick operations.

Several models, both phenomenological and analytical, have been developed to describe the energetics of Auger transitions.

Several previous unsuccessful attempts to unite the colonies were made, with proposed political models ranging from unitary, to loosely federal.

Several models for the origin of gamma-ray bursts postulated that the initial burst of gamma rays should be followed by slowly fading emission at longer wavelengths created by collisions between the burst ejecta and interstellar gas.

Several fashion models who were deemed to commercial and too curvacious were fed up with industry standard and took a different approach.

Several U. S. Navy warship models are on display, and a flight simulator for the new F-35 Lightning II is featured.

Several theoretical models have been developed to explain sensorimotor calibration in terms of synaptic plasticity within the cerebellum.

Several Peugeot models were assembled in Australia, commencing with the 203 in 1953.

Several pornographic actors and glamour models also act as fetish models.

Several boat and ship models were found in the tomb of Tutankhamen, dating to the Sixth Dynasty, and at Meketra ( 2061-2010BC ).

Several models have been created to describe coming out as a process for gay and lesbian identity development, e. g. Dank, 1971 ; Cass, 1984 ; Coleman, 1989 ; Troiden, 1989.

Several such models have been suggested.

Several models have been introduced to social comparison, including the Self-Evaluation Maintenance Model ( SEM ) ( Tesser, 1988 ), Proxy Model ( Wheeler et al., 1997 ), the Triadic Model and the Three-Selves Model.

Several materials or combinations of materials can be used to construct a satisfactory feed bunk.

Several other oxidation states are known, which range from + 2 to + 7 and can be identified by their characteristic optical absorption spectra.

Several ways of implementing this exist, and hot-wire devices can be further classified as CCA ( constant-current anemometer ), CVA ( constant-voltage anemometer ) and CTA ( constant-temperature anemometer ).

Several intact arched stone bridges from the Hellenistic era can be found in the Peloponnese in southern Greece

Several topics that might be covered here are instead covered there because much more can be said about them in a human context.

Several species of fungi can be used for bioleaching.

Several CPUs can be combined in a single processing chip.

Several uses of the copula can be categorized:

Several kinds of descriptive categorizations can be applied broadly to the elements, including consideration of their general physical and chemical properties, their states of matter under familiar conditions, their melting and boiling points, their densities, their crystal structures as solids, and their origins.

Several countries can use the same name for their own distinct currencies ( for example, dollar in Australia, Canada and the United States ).

Several in vitro studies indicated that high concentrations of chromium ( III ) in the cell can lead to DNA damage.

Several simple games can be played to select one person from a group, either as a straightforward winner, or as someone who is eliminated.

Several kinds of cytochrome exist and can be distinguished by spectroscopy, exact structure of the heme group, inhibitor sensitivity, and reduction potential.

Several types of chocolate can be distinguished.

Several other quantities can be used to describe the composition of a mixture.

Several of the treasuries can be identified, among them the Siphnian Treasury, dedicated by the city of Siphnos whose citizens gave a tithe of the yield from their gold mines until the mines came to an abrupt end when the sea flooded the workings.

Several well-known criteria can be used to establish a probable diagnosis.

Several qualitative observations can be made of diffraction in general:

Several unofficial remakes of Duck Hunt have been released which enable the player to shoot the dog. The dog makes a cameo appearance in the NES game Barker Bill's Trick Shooting ( another Zapper game ) and he can be shot.

Several generations of an aphid population can exist over the lifespan of a single leaf.

Several types of brain lesions can occur in individuals with TSC and 60 %-90 % of people with TSC develop epilepsy.

Several measurements can be done on the F responses, including minimal and maximal latencies, and F wave persistence.

Several other points can be considered which contradict the " cathedral glass flow " theory:

Several " Harold and Maude " fans have since built similar hearses from E-Types and photos of them can be found online.

Several ancient written precursors to Hamlet can be identified.