Towards an Electronic Kilogram Physics 250 Victor Acosta NOTE: Almost everything in this report was taken from NIST websites. The Old Standard: "Le Gran K" Held In Sevres, France Only 1/7 SI units using physical artifact m/m = 30 ppb Ideas for New Standard X-Rays in Si
Avogadros #, NA 340 ppb (2003) Watt-balance: EM vs. G Planck Constant, h 52 ppb (2005) Link to "invariant" quantum phenomena ? The Watt Balance Balance Gravity Force with EMF Find value for h,
Plancks Constant 2R h me c 2 Physics Faraday's Law
1 c E l B a v z z F I
z Animation (if it works) Measurements: Voltage Hg Battery Stabilized I-Source Zener Diode Iind.
RDVM Josephson Array Voltage nfh 2e Determine f with GPS Atomic clock Measurements: Velocity 3 HeNe Laser systems give v and z Easily referenced to Meter standard: HeNe = 632.99139822 nm
Measurement: Current Iind. Use DVM (Josephson ref.) to measure V across R Get R via Quantum Hall Effect RH h j e2
DVM Measurement: Gravity When scale is balanced F I v m 1
J VJ g vHeNe RH Easy to reference gravity! Use nearby gravimeter < 10 meters away Reference with HeNe, GPS Watt-Balance UC
Basic references (error mode) Mass (force) Voltage, square error (current, voltage) nW/W 15 2 Resistance (current) 10 Time, linear error (voltage, current, velocity) 0.5
Length (velocity) 3 Local gravity acceleration (force) 30 TOTAL RMS 52
Native Americans of New York State Mrs. Martin Grade 4 Vocabulary Iroquois Algonquians Haudenosaunee wigwam League of Nations hunter-gatherers Sachems nomads Wampum artifacts Clan archaeologist Longhouse natural resource artifacts Tools: arrowheads leaf shaped knives part of a post Objects used...
Lesson: The Cell Cycle Agriscience Instructor: Student Objectives 1) Diagram and label the cell cycle and understand of each phase. 2) Identify cells in each stage of the cell cycle. 3) Understand how the cell controls cell division. Understanding the...
Times New Roman Arial Monotype Sorts Dad's Tie MS_ClipArt_Gallery Slide 1 Protein Synthesis: overview The Triplet Code Transcription, I Transcription, II mRNA modification Translation, I Translation, II Translation, III Mutations: genetic material changes in a cell
WORLD WAR I THE WAR TO END ALL WARS At the beginning of the War, there were 2 alliances in place. The first was called the Triple Alliance, but it grew and became known as the Central Powers: Germany, Austria-Hungary,...
Looping the Flow Open Issues in our Simple Model The Stored-Program Computer Anatomy of a von Neumann Computer Instruction Set Architecture (ISA) MIPS Programming Model a representative simple RISC machine Some MIPs Memory Nits MIPS Register Nits MIPS Instruction Formats...
March Hemoglobinuria Transient, occurs after forceful contact of body with hard surfaces....joggers, soldiers after long march, bongo drum players. Hemoglobinuria; schistocytes may be present on smear.
Search Engines Richard A Fisher From deadlock.com tutorial Introduction What are search engines Don't take sweets from strangers Treat your web like your resume Agenda How search engines work Choosing keywords Preparing your pages Submitting your pages Yahoo How They...
Download Presentation
Ready to download the document? Go ahead and hit continue!
