简介:通过对△^pn与△^pn(A)两类复杂性语言中的多项式图灵完全集之间关系的研究,证明了L^pn、H^pn等计算复杂性语言类的递归可表示性。
简介:Itisprovedthatisa(Δ+1)-colorablegraph,soarethegraphsG×PnandC×Cn,wherePnandCnarerespectivelythepathandcyclewithnvertices,andΔthemaximumedgedegreeofthegraph.TheexactchromaticnumbersoftheproductgraphsPr1×Pr2×…×PrnandC3k×C2m1×C2m2×…×C2mnarealsopresented.Thusthetltalcoloringconjectureisprovedtobetrueformanyothergraphs.
简介:TheelectricalnonlinearityofsiliconmodulatorsbasedonreversedPNjunctionswasfoundtoseverelylimitthelinearityofthemodulators.Thiseffect,however,wasinadvertentlyneglectedinpreviousstudies.Consideringtheelectricalnonlinearityinsimulation,a32.2dBdegradationintheCDR3(i.e.,thesuppressionratiobetweenthefundamentalsignalandintermodulationdistortion)ofthemodulatorwasobservedatamodulationspeedof12GHz,andthespuriousfreedynamicrangewassimultaneouslydegradedby17.4dB.ItwasalsofoundthatthelinearityofthesiliconmodulatorcouldbeimprovedbyreducingtheseriesresistanceofthePNjunction.Thefrequencydependenceofthelinearityduetotheelectricalnonlinearitywasalsoinvestigated.
简介:ThePNjunctionphotodiodeisfabricatedwithhighresistivityP-typesilicon(ρ=12000Ω·cm).TheexperimentalC-Vcurveswithandwithoutlaserradiationweremeasured.Therelativechangeofcapacitancecanbegreaterthan100%,whichismuchgreaterthantherelativechangeforlowresistivityP-typesilicon.Therelativechageofcaacitancewithandwithoutlaserradiationatzerobiasis121.7%.