7,897 research outputs found

    A 3-D Track-Finding Processor for the CMS Level-1 Muon Trigger

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    We report on the design and test results of a prototype processor for the CMS Level-1 trigger that performs 3-D track reconstruction and measurement from data recorded by the cathode strip chambers of the endcap muon system. The tracking algorithms are written in C++ using a class library we developed that facilitates automatic conversion to Verilog. The code is synthesized into firmware for field-programmable gate-arrays from the Xilinx Virtex-II series. A second-generation prototype has been developed and is currently under test. It performs regional track-finding in a 60 degree azimuthal sector and accepts 3 GB/s of input data synchronously with the 40 MHz beam crossing frequency. The latency of the track-finding algorithms is expected to be 250 ns, including geometrical alignment correction of incoming track segments and a final momentum assignment based on the muon trajectory in the non-uniform magnetic field in the CMS endcaps.Comment: 7 pages, 5 figures, proceedings for the conference on Computing in High Energy and Nuclear Physics, March 24-28 2003, La Jolla, Californi

    AdS_4 x CP^3 superstring and D=3 N=6 superconformal symmetry

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    Motivated by the isomorphism between osp(4|6) superalgebra and D=3 N=6 superconformal algebra we consider the superstring action on the AdS_4 x CP^3 background parametrized by D=3 N=6 super-Poincare and CP^3 coordinates supplemented by the coordinates corresponoding to dilatation and superconformal generators. It is also discussed the relation between the degeneracy of fermionic equations of motion and the action kappa-invariance in the framework of the supercoset approach.Comment: revtex, 12 pages. Version accepted to Phys. Rev. D; v4 corrected misprints in Eqs.(65), (71); v5 corrected discussion of Z_4 grading on page

    ΠΠ°Π΄Π΅ΠΆΠ½ΠΎΡΡ‚ΡŒ конструкции ячССк радиоэлСктронной Π°ΠΏΠΏΠ°Ρ€Π°Ρ‚ΡƒΡ€Ρ‹ ΠΏΡ€ΠΈ Π²Π½Π΅ΡˆΠ½ΠΈΡ… мСханичСских воздСйствиях

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    Π ΠΎΠ·Π³Π»ΡΠ΄Π°Ρ”Ρ‚ΡŒΡΡ Π²ΠΏΠ»ΠΈΠ² Π½Π°ΠΏΡ€ΡƒΠΆΠ΅Π½ΡŒ Ρƒ Π²ΠΈΠ²ΠΎΠ΄Π°Ρ… мікросхСм, ΠΌΡ–ΠΊΡ€ΠΎ-Π·Π±Ρ–Ρ€ΠΎΠΊ, Ρ‚Π° Ρƒ Ρ—Ρ… паяних з’єднаннях, Ρ‰ΠΎ Ρ” Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚ΠΎΠΌ Π΄Ρ–Ρ— Π·ΠΎΠ²Π½Ρ–ΡˆΠ½Ρ–Ρ… ΠΌΠ΅Ρ…Π°Π½Ρ–Ρ‡Π½ΠΈΡ… Π²ΠΏΠ»ΠΈΠ²Ρ–Π² – Π²Ρ–Π±Ρ€Π°Ρ†Ρ–ΠΉ Ρ‚Π° ΡƒΠ΄Π°Ρ€Ρ–Π² – Π½Π° ΠΏΠΎΠΊΠ°Π·Π½ΠΈΠΊΠΈ надійності Ρ‡Π°Ρ€ΡƒΠ½ΠΊΠΈ Π°Π΄Ρ–ΠΎΠ΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Π½ΠΎΠ³ΠΎ Π°ΠΏΠ°Ρ€Π°Ρ‚Ρƒ.he influence of pressure in conclusions of microcircuits, microassembly, and in them solder connections, as result of action of external mechanical loadings – vibrations and impacts – on parameters of reliability of a cell of the radioelectronic device is considered.РассматриваСтся влияниС напряТСний Π² Π²Ρ‹Π²ΠΎΠ΄Π°Ρ… микросхСм, микросборок, ΠΈ Π² ΠΈΡ… паяных соСдинСниях, ΠΊΠ°ΠΊ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚ дСйствия Π²Π½Π΅ΡˆΠ½ΠΈΡ… мСханичСских Π½Π°Π³Ρ€ΡƒΠ·ΠΎΠΊ – Π²ΠΈΠ±Ρ€Π°Ρ†ΠΈΠΉ ΠΈ ΡƒΠ΄Π°Ρ€ΠΎΠ² – Π½Π° ΠΏΠΎΠΊΠ°Π·Π°Ρ‚Π΅Π»ΠΈ надСТности ячСйки радиоэлСктронного Π°ΠΏΠΏΠ°Ρ€Π°Ρ‚Π°

    ГипСрслучайныС Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½Ρ‹Π΅ характСристики конструкций радиоэлСктронных срСдств

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    Розглянуті ΠΌΠ΅Ρ‚ΠΎΠ΄ΠΈ визначСння Ρ„ΡƒΠ½ΠΊΡ†Ρ–ΠΎΠ½Π°Π»ΡŒΠ½ΠΈΡ… ΠΏΠΎΠΊΠ°Π·Π½ΠΈΠΊΡ–Π² Π Π•Π— ΠΏΡ–Π΄ час проСктування Π½Π° основі Ρ‚Π΅ΠΎΡ€Ρ–Ρ— Π³Ρ–ΠΏΠ΅Ρ€Π²ΠΈΠΏΠ°Π΄ΠΊΠΎΠ²ΠΈΡ… явищThe methods of definition of the designs radioelectronic apparatus parameters during designing on the basis of the hyperbolic-accidental phenomena are consideredРассмотрСны ΠΌΠ΅Ρ‚ΠΎΠ΄Ρ‹ опрСдСлСния ΠΏΠΎΠΊΠ°Π·Π°Ρ‚Π΅Π»Π΅ΠΉ конструкций Π Π­Π‘ ΠΏΡ€ΠΈ ΠΏΡ€ΠΎΠ΅ΠΊΡ‚ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠΈ Π½Π° основС Ρ‚Π΅ΠΎΡ€ΠΈΠΈ гипСрслучайных явлСни

    Heavy quark potential in lattice QCD at finite temperature

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    Results of the study of lattice QCD with two flavors of nonperturbatively improved Wilson fermions at finite temperature are presented. The transition temperature for m_{\pi}/m_{\rho} \sim 0.8 and lattice spacing a \sim 0.12 fm is determined. A two-exponent ansatz is successfully applied to describe the heavy quark potential in the confinement phase.Comment: 3 pages, 1 figure, talk given at the 5th International Conference on Quark Confinement and the Hadron Spectrum, Gargnano, Italy, 10-14 Sep 200

    ΠŸΡ€ΠΈΠ½Ρ†ΠΈΠΏΡ‹ проСктирования конструкцій радиоэлСктронных Π°ΠΏΠΏΠ°Ρ€Π°Ρ‚ΠΎΠ² с ΠΎΠΏΡ‚ΠΈΠΌΠ°Π»ΡŒΠ½Ρ‹ΠΌΠΈ показатСлями качСства

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    Розглянуті ΠΏΡ€ΠΎΠ±Π»Π΅ΠΌΠΈ, Ρ‰ΠΎ Π²ΠΈΠ½ΠΈΠΊΠ°ΡŽΡ‚ΡŒ ΠΏΡ–Π΄ час проСктування ΠΎΠΏΡ‚ΠΈΠΌΠ°Π»ΡŒΠ½ΠΈΡ… конструкцій Ρ€Π°Π΄Ρ–ΠΎΠ΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Π½ΠΎΡ— Π°ΠΏΠ°Ρ€Π°Ρ‚ΡƒΡ€ΠΈ, Π° Ρ‚Π°ΠΊΠΎΠΆ ΠΌΠ΅Ρ‚ΠΎΠ΄ΠΈ створСння Ρ†Ρ–Π»ΡŒΠΎΠ²ΠΎΡ— Ρ„ΡƒΠ½ΠΊΡ†Ρ–Ρ— ΠΏΡ€ΠΈΡΡ‚Ρ€ΠΎΡŽ, Ρ‰ΠΎ Π·Π°Π±Π΅Π·ΠΏΠ΅Ρ‡Π°Ρ‚ΡŒ Π½Π°ΠΉΠ²ΠΈΡ‰Ρ– ΠΏΠΎΠΊΠ°Π·Π½ΠΈΠΊΠΈ якості об’єкту проСктування.The problems arising at designing of optimum designs of radioelectronic modules the equipment, and also methods of creation of criterion function of the device ensuring best parameters of quality of object of designing are considered.РассмотрСны ΠΏΡ€ΠΎΠ±Π»Π΅ΠΌΡ‹, Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡŽΡ‰ΠΈΠ΅ ΠΏΡ€ΠΈ ΠΏΡ€ΠΎΠ΅ΠΊΡ‚ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠΈ конструкций радиоэлСктронной Π°ΠΏΠΏΠ°Ρ€Π°Ρ‚ΡƒΡ€Ρ‹, Π° Ρ‚Π°ΠΊΠΆΠ΅ ΠΌΠ΅Ρ‚ΠΎΠ΄Ρ‹ создания Ρ†Π΅Π»Π΅Π²ΠΎΠΉ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ устройства, ΠΎΠ±Π΅ΡΠΏΠ΅Ρ‡ΠΈΠ²Π°ΡŽΡ‰ΠΈΠ΅ Π½Π°ΠΈΠ²Ρ‹ΡΡˆΠΈΠ΅ ΠΏΠΎΠΊΠ°Π·Π°Ρ‚Π΅Π»ΠΈ качСства ΠΎΠ±ΡŠΠ΅ΠΊΡ‚Π° проСктирования

    ΠžΠΏΡ‚ΠΈΠΌΠΈΠ·Π°Ρ†ΠΈΡ размСщСния Ρ‚Π΅ΠΏΠ»ΠΎΠ²Ρ‹Π΄Π΅Π»ΡΡŽΡ‰ΠΈΡ… Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½Ρ‹Ρ… ΡƒΠ·Π»ΠΎΠ² ΠΈ элСктрорадиоэлСмСнтов Π½Π° ΠΏΠ΅Ρ‡Π°Ρ‚Π½ΠΎΠΉ ΠΏΠ»Π°Ρ‚Π΅

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    Π ΠΎΠ·Π³Π»ΡΠ΄Π°ΡŽΡ‚ΡŒΡΡ ΠΌΠ΅Ρ‚ΠΎΠ΄ΠΈ Ρ‚Π° ΠΏΡ€ΠΎΠ³Ρ€Π°ΠΌΠ° Π°Π²Ρ‚ΠΎΠΌΠ°Ρ‚ΠΈΠ·ΠΎΠ²Π°Π½ΠΎΠ³ΠΎ розміщСння Ρ‚Π΅ΠΏΠ»ΠΎΠ²ΠΈΠ΄Ρ–Π»ΡΡŽΡ‡ΠΈΡ… Ρ„ΡƒΠ½ΠΊΡ†Ρ–ΠΎΠ½Π°Π»ΡŒΠ½ΠΈΡ… Π²ΡƒΠ·Π»Ρ–Π² Ρ‚Π° Π΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΡ€Π°Π΄Ρ–ΠΎΠ΅Π»Π΅ΠΌΠ΅Π½Ρ‚Ρ–Π² Π½Π° Π΄Ρ€ΡƒΠΊΠΎΠ²Π°Π½Ρ–ΠΉ ΠΏΠ»Π°Ρ‚Ρ– Ρ€Π°Π΄Ρ–ΠΎΠ΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Π½ΠΎΠ³ΠΎ Π°ΠΏΠ°Ρ€Π°Ρ‚Ρƒ, які Π·Π°Π±Π΅Π·ΠΏΠ΅Ρ‡ΡƒΡŽΡ‚ΡŒ ΠΎΠΏΡ‚ΠΈΠΌΠ°Π»ΡŒΠ½Ρ–ΡΡ‚ΡŒ Ρ‚Π΅ΠΏΠ»ΠΎΠ²ΠΎΠ³ΠΎ Ρ€Π΅ΠΆΠΈΠΌΡƒThe methods and program of the automated accommodation of functional units and radioelements allocating is warmly on the printedcircuit-board of the radioelectronic device ensuring an optimality of a thermal mode are consideredΠ Π°ΡΡΠΌΠ°Ρ‚Ρ€ΠΈΠ²Π°ΡŽΡ‚ΡΡ ΠΌΠ΅Ρ‚ΠΎΠ΄Ρ‹ ΠΈ ΠΏΡ€ΠΎΠ³Ρ€Π°ΠΌΠΌΠ° Π°Π²Ρ‚ΠΎΠΌΠ°Ρ‚ΠΈΠ·ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ размСщСния Ρ‚Π΅ΠΏΠ»ΠΎΠ²Ρ‹Π΄Π΅Π»ΡΡŽΡ‰ΠΈΡ… Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½Ρ‹Ρ… ΡƒΠ·Π»ΠΎΠ² ΠΈ элСктрорадиоэлСмСнтов Π½Π° ΠΏΠ΅Ρ‡Π°Ρ‚Π½ΠΎΠΉ ΠΏΠ»Π°Ρ‚Π΅ радиоэлСктронного Π°ΠΏΠΏΠ°Ρ€Π°Ρ‚Π°, ΠΎΠ±Π΅ΡΠΏΠ΅Ρ‡ΠΈΠ²Π°ΡŽΡ‰ΠΈΠ΅ ΠΎΠΏΡ‚ΠΈΠΌΠ°Π»ΡŒΠ½ΠΎΡΡ‚ΡŒ Ρ‚Π΅ΠΏΠ»ΠΎΠ²ΠΎΠ³ΠΎ Ρ€Π΅ΠΆΠΈΠΌ
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