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# Topic: Reversible

###### In the News (Wed 24 Apr 19)

 Reversible Logic PhysComp '96 was held in Boston in November of 1996. Reversible computing at MIT is a large and active area of research, with investigations reaching from the levels of the physics of computation and theory of reversible computing, through the circuit techniques for implementing reversible logic, to the development of instruction sets and programming languages which support fully reversible computation." This brief introduction to reversible logic is provided courtesy of Ralph C. Merkle. www.zyvex.com /nanotech/reversible.html   (846 words)

 Reversible process (thermodynamics) - Wikipedia, the free encyclopedia In thermodynamics, a reversible process, or reversible cycle if the process is cyclic, is a process that can be "reversed" by means of infinitesimal changes in some property of the system without loss or dissipation of energy. A reversible process changes the state of a system in such a way that the net change in the combined entropy of the system and its surroundings is zero. Reversible processes define the boundaries of how efficient heat engines can be in thermodynamics and engineering: a reversible process is one where no heat is lost from the system as "waste", and the machine is thus as efficient as it can possibly be (see Carnot cycle). en.wikipedia.org /wiki/Reversible_process_(thermodynamics)   (567 words)

 Reversible computing - Wikipedia, the free encyclopedia The term reversible computing refers to any computational process that is (at least to some close approximation) reversible, i.e., time-invertible, meaning that a time-reversed version of the process could exist within the same general dynamical framework as the original process. For example, within the context of deterministic dynamical frameworks, a necessary condition for reversibility is that the transition function mapping states to their successors at a given later time should be one-to-one. The implementation of reversible computing thus amounts to learning how to characterize and control the physical dynamics of mechanisms to carry out desired computational operations so precisely that we can accumulate a negligible total amount of uncertainty regarding the complete physical state of the mechanism, per each logic operation that is performed. en.wikipedia.org /wiki/Reversible_computing   (782 words)

 UF RESEARCHER: “REVERSIBLE” COMPUTERS MORE ENERGY EFFICIENT, FASTER   (Site not responding. Last check: 2007-10-13) So-called “reversible computing” would not only reduce computer chips’ power consumption, it also could boost their speed, because these chips are becoming so fast that the heat they generate limits the speed at which they can operate without overheating and malfunctioning. In fact, unless reversible computing is achieved, computer chips are expected to reach their maximum performance capabilities within the next three decades, effectively halting the rapid advances in speed that have driven the information technology revolution, Frank said. Reversible computing seeks to configure integrated circuits in such a way that they can use their current state to recover previous states - in other words, rather than building up and tossing away unwanted information, the chips “uncompute” it fluidly, with little power expenditure or heat generation. www.napa.ufl.edu /2003news/efficientcomputer.htm   (789 words)

 What's Reversible Computing?   (Site not responding. Last check: 2007-10-13) Such a computation is "reversible" since the reconstruction of previous states could be applied to allow progressing backwards through the computer's sequence of states, in a time-reversed fashion. Also, reversibility isn't an all-or-nothing proposition; if the overhead of total reversibility is too high, it can be greatly reduced by allowing information to be thrown away occasionally, while still allowing almost all of the benefits of the reversibility to be realized. Reversible computing may have applications in computer security and transaction processing, but we anticipate that the main long-term benefit will be to allow faster, smaller computers. www.cise.ufl.edu /research/revcomp/what.html   (327 words)

 Reversible Process -- from Eric Weisstein's World of Physics A reversible process is one in which the timescale is assumed to be so slow that every intermediate state deviates only infinitesimally from equilibrium. A good approximation to a reversible process would be realized by removing the sand one grain at a time and carefully recording the thermodynamic variables (temperature and pressure in this case) after each grain of sand is removed. This would be a reversible expansion and one could individually return the grains of sand one at a time and reproduce each intermediate state exactly, thus reversing the transformation. scienceworld.wolfram.com /physics/ReversibleProcess.html   (168 words)

 Reversible Container A Reverse Iterator adaptor whose base iterator type is the container's iterator type. A Reverse Iterator adaptor whose base iterator type is the container's const iterator type. It follows from this that the reverse iterator type and the const reverse iterator type may also be the same. www.sgi.com /tech/stl/ReversibleContainer.html   (189 words)

 Reversible and size adjustable hat - Patent 5488740   (Site not responding. Last check: 2007-10-13) The reversible sailors hat includes two hats lying inside of the other with each hat having a crown and a brim secured edge to edge with the crown by a seam. The hat may be quickly and easily reversed and/or styled in a variety of different ways to greatly increase the usefulness of the hat and its adaptability to be worn with a variety of different clothes. The outer and inner surfaces of the forward crown portion of the cap include indicia indicating upstream and downstream directions, respectively, the downstream direction being disposed for viewing by a person portioned to the front of the cap when the cap is worn with the red side thereof to the left of the wearer. www.freepatentsonline.com /5488740.html   (2410 words)

 Reversible Agents   (Site not responding. Last check: 2007-10-13) After reviewing the general concept of reversible computation, this paper will describe several different types of fundamental entropy costs that agents must apparently pay, including costs to achieve goals states, to observe a changing world, to run indefinitely in finite memory, and to exchange messages with other agents. But recently it has been shown that such losses are not intrinsic to computer logic; "reversible" (one to one) gates can be designed with no logical losses, and with bits of entropy lost to friction per instruction inverse in the time allowed to execute each instruction at low temperature. For concreteness, one may image the agent's CPU to be implemented in reversible rod logic [4], where state is held in the position of short solid rods. hanson.gmu.edu /reverse.html   (3732 words)

 Reversible knit stitch patterns Esther Bozak pioneered this concept on the net, and has for years made available her really good set of free patterns for reversible scarves. Check out the full write-up for our reversible version, which is mostly garter stitch with a Bohus twist. It's eminently reversible, and has a very cool, lacey sort of texture, which in our opinion would make great scarves, either in chenille or in Merino Frappe. www.fuzzygalore.biz /patterns/reversible.shtml   (639 words)

 Tycon II reversible necktie - Patent 6687914   (Site not responding. Last check: 2007-10-13) The reversible necktie configuration as in claim 1, wherein said releasable attaching mechanism comprises a reversible zipper having a zipper strip attached to said respective outboard edges of each of said lateral flaps, at least one of said zipper strips including a zipper clasp. The reversible necktie configuration as in claim 1, further comprising a tab member disposed so as to extend from a narrower longitudinal end of said planar member, said tab comprising a button hole for releasable attachment to a button of a wearer's shirt in either of said necktie configurations. The reversible necktie configuration as in claim 6, wherein said tab is pivotally attached to said planar member so as to pivot with movement of said planar member when said tab is attached to a wearer's shirt. www.freepatentsonline.com /6687914.html   (2649 words)

 reversible records - independent house music @ boston.   (Site not responding. Last check: 2007-10-13) reversible's dj/artist chris reavey will begin a bimonthly residency at aries lounge in raleigh, NC beginning on oct 29th and continuing on new years eve. reversible dj/artist eli wilkie will be representing the reversible family on sept 9th at aries. reversible is no stranger to the balance record pool chart, REV 001, reversible first release by agent 001 (steve porter and eli wilkie) topped the prestigious music chart for weeks followed by records vinyl sales for the label. www.reversiblerecords.com   (653 words)

 Reversible Process Thermodynamic - Engineers Edge   (Site not responding. Last check: 2007-10-13) A reversible process for a system is defined as a process that, once having taken place, can be reversed, and in so doing leaves no change in either the system or surroundings. In reality, there are no truly reversible processes; however, for analysis purposes, one uses reversible to make the analysis simpler, and to determine maximum theoretical efficiencies. Therefore, the reversible process is an appropriate starting point on which to base engineering study and calculation. www.engineersedge.com /thermodynamics/reversible_process.htm   (243 words)

 GCiron sells reversible plate compactors. Reversible Plate Compactors have two eccentric weights that allow smooth transition for forward or reverse travel, plus increased compaction force as the result of dual weights. Due to their weight and force, reversible plates are ideal for semi-cohesive soils. Unlike forward plates, the reversible’s forward travel may be stopped and the machine will maintain its force for “spot” compaction. www.gciron.com /SearchResults.asp?Cat=56   (675 words)

 Reversible Omega Necklace A reversible process (or reversible cycle if the process is cyclic), in thermodynamics, is a process that can be "reversed" by means of infinitesimal changes in some property ofthe system (Sears and Salinger, 1986). Reversible processes define the boundaries of how efficient heat engines can be in thermodynamicsand engineering: a reversible process is one where no heat is lost from the system as "waste" (or "disorder"), and the machine isthus as efficient as it can possibly be (see Carnot cycle). Reversible processes are always quasistatic, but the converse is not alwaystrue (Sears and Salinger, 1986). www.altvetmed.com /face/43887-reversible-omega-necklace.html   (667 words)

 Brainboost - what is reversible encryption Using reversible encryption is essentially the same as storing the passwords in plain - text, or not using any encryption at all.. Storing passwords using reversible encryption is essentially the same as storing plaintext versions of the passwords.. I ve previously blogged about storing password in plain text, and figured that reversible encryption is tantamount to storing in plain text.. www.brainboost.com /search.asp?Q=what+is+reversible+encryption&lfmq=1   (177 words)

 Puzzle 20.- Reversible Primes 13 is the least reversible non palindrome prime because 31 is also a prime. 10^2003-1+(k-999999999)*10^997 is a reversible prime with 2003 digits for the following nine k: 107671501, 158957701, 168586801, 268720301, 292300601, 318811301, 689715601, 856978001, 996358669. In each case the decimal prime and the reverse is k and reverse(k) with 997 9's on both sides. www.primepuzzles.net /puzzles/puzz_020.htm   (317 words)

 REVERSIBLE LEATHERS - Maximum Protection for Serious Bikers" Cordura™ water resistant reversible lining, reversible front and side zippers, wind flap on Cordura™ side to keep wind and water out, zippered cuffs, four zippered front pockets on leather side that match the Cordura™ pockets inside. Cordura™ water resistant reversible lining, wind/rain flap covering the reversible front zipper, a reversible side zipper for more sitting comfort, a removable leather belt, a removable Cordura™ belt, two front and two back zippered vents, and two slash zippered front lap pockets. Cordura™ water resistant reversible lining, back is wide adjustable kidney support on back, reversible leg zippers, one snap pocket on hip which matches the pocket inside if reversed. leathercatalog.net /cgi-bin/html_web_store.cgi?page=reversibles.htm&...   (632 words)

 Reversible Errors - Scott Turow Instead it's a dying convict's claim that the crime played out quite differently that sets the whole chain of events going: Erno Erdai makes a pretty convincing case that Rommy is innocent. Reversible Errors is partly a legal procedural, following the steps of appeals and rulings, but Turow doesn't focus too much on the legal minutiae. Reversible Errors is a solid legal thriller, but not an exceptional one, a decent read but not a truly gripping one. www.complete-review.com /reviews/popus/turows.htm   (1369 words)

 FuelCellStore.com's What Is A Fuel Cell fuel cell, hydrogen, fuel cells, alternative energy, proton exchange membrane, ...   (Site not responding. Last check: 2007-10-13) The overall electrochemical process of a fuel cell is called "reverse hydrolysis," or the opposite of hydrolyzing water to form hydrogen and oxygen. Only certain fuel cell types are reversible, that is, can also accomplish the electrochemistry associated with both the production of electricity from fuel and oxidant and the production of fuel and oxidant from water when supplied with electricity. The Reversible fuel cell concept is one that incorporates a reversible fuel cell that can accomplish both hydrolysis and reverse hydrolysis in the same cell. www.fuelcellstore.com /information/how_fuelcells_work.htm   (332 words)

 Reversible Rules   (Site not responding. Last check: 2007-10-13) An advantage of reversible cellular automata for cryptography is that both encryption and decryption can be performed in an entirely data-parallel fashion. Here the reversible CA function 1) as a way to introduce full nonlinearity into the system, compensating for the partial linearity of the irreversible rules, and 2) as a way to globally broadcast the information in the link (see section 2.2.1) to the entire block and in a single iteration. Figure 2a shows the evolution of an initial random block of length 256 for 256 generations where the block is interpreted as composed of cells with 2 possible states. www.santafe.edu /~hag/crypto/node8.html   (375 words)

 Wallababy :: Reversible Baby Slings I can reverse the sling to wear the print or just the solid color, depending on my mood. Reverse it to keep your baby clean until you get home to wash it. The Wallababy Reversible Sling is extremely easy to wash and care for. www.wallababy.com   (349 words)

 Reversible Merino Wool Jacket   (Site not responding. Last check: 2007-10-13) Reversible Merino Wool Jacket is available at a great price in Magellans.com. Magellan's was founded by people who love travel for its ability to enrich our lives and increase our appreciation for the world in which we live. Reverses from warm tan to fl for two different looks. www.exclamationagiftshop.com /travel/Reversible_Merino_Wool_Jac.shtml   (172 words)

 Wired News: Chip Design Reverses a Hot Trend In fact, it originated at IBM in the early 1960s and is currently being investigated at a number of universities. But so far, the only company to have designed a reversible processor for commercial use is a little-known startup called Adiabatic Logic. Frank said managers at IBM were "generally positive" about the idea of using reversible computing during a presentation he made recently at the company's offices in Yorktown Heights, New York. www.wired.com /news/technology/0,1282,61118,00.html?tw=wn_techhead_1   (787 words)

 Mike's Reversible Computing Page For the longer term, we argue that the laws of physics imply that the most efficient computers that can physically exist will necessarily be composed out of reversible or nearly-reversible processing elements, and that therefore it is important for the future success of computer science to study the design and programming of these reversible architectures. The MIT reversible computing project's students have all graduated, and its faculty are currently focusing on other projects. This is a paper and talk presented at Nanotech '97 which discusses asymptotic scaling issues and compares the performance of a variety of reversible and irreversible technologies. www.cise.ufl.edu /~mpf/rc/home.html   (1162 words)

 Reversible ischemic neurologic deficit: Is it a stroke? - MayoClinic.com   (Site not responding. Last check: 2007-10-13) Signs and symptoms of reversible ischemic neurologic deficit are identical to a stroke, including: Other causes of RIND include a blood clot moving to the brain from another part of the body (embolism), most often from the heart. Treatment of reversible ischemic neurologic deficit depends on its underlying cause. www.mayoclinic.com /health/reversible-ischemic-neurologic-deficit/AN00185   (366 words)

 Amazon.com: Reversible Errors: A Novel: Books: Scott Turow   (Site not responding. Last check: 2007-10-13) In the first chapter of Scott Turow's REVERSIBLE ERRORS, the reader meets Arthur Raven, a typically (for the genre) jaded lawyer assigned to a pro bono capital case. The protagonist in REVERSIBLE ERRORS is attorney Arthur Raven. With REVERSIBLE ERRORS, Turow proves his understanding of the proper weave of legal jargon and tactics into "lay" jargon. www.amazon.com /Reversible-Errors-Novel-Scott-Turow/dp/0374281602   (1680 words)

 IT Architect | Get Mean, Go Green | January 5, 2004   (Site not responding. Last check: 2007-10-13) Reversible computers, or adiabatic systems, recycle their energy to give off extremely little heat, enabling computing power to continue growing where existing technology would falter. Frank has already developed a new set of reversible circuit designs over the last few years, and with the creation of a power supply, will have the core elements to create a fully functional reversible computer system. At its simplest, reversible computing is a form of computing in which the system's entropy is nearly constant-no information is discarded, or at least the amount of information that's ever discarded is reduced. www.itarchitect.com /shared/article/showArticle.jhtml?articleId=17200267&classroom=   (1676 words)

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