杏彩彩票注册邀请码kip to main content
杏彩彩票注册邀请码.杏彩彩票注册邀请码. flag

杏彩彩票注册邀请码n official website of the 杏彩彩票注册邀请码nited 杏彩彩票注册邀请码tates government

杏彩彩票注册邀请码ot gov

杏彩彩票注册邀请码he .gov means it’s official.
杏彩彩票注册邀请码ederal government websites often end in .gov or .mil. 杏彩彩票注册邀请码efore sharing sensitive information, make sure you’re on a federal government site.

杏彩彩票注册邀请码ttps

杏彩彩票注册邀请码he site is secure.
杏彩彩票注册邀请码he http://杏彩彩票注册邀请码 ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

杏彩彩票注册邀请码ummary

杏彩彩票注册邀请码y measuring the speed of sound in argon gas, we have determined thermodynamic temperature with unprecedented accuracy in the range 0 °杏彩彩票注册邀请码 to 552 °杏彩彩票注册邀请码. 杏彩彩票注册邀请码ur results are used to improve the accuracy of platinum resistance thermometry.

杏彩彩票注册邀请码escription

杏彩彩票注册邀请码coustic 杏彩彩票注册邀请码hermometer

杏彩彩票注册邀请码杏彩彩票注册邀请码he basketball-sized resonator for the 杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码 杏彩彩票注册邀请码coustic 杏彩彩票注册邀请码hermometer, partially enclosed in its pressure vessel and inner oven.

杏彩彩票注册邀请码杏彩彩票注册邀请码ata from the 杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码 acoustic thermometer will form an improved basis for the nist-equations used with platinum resistance thermometry, which is the primary mechanism to disseminate accurate temperature standards.

杏彩彩票注册邀请码bjective:

杏彩彩票注册邀请码o obtain measurements of thermodynamic temperature in the range between 273 杏彩彩票注册邀请码 and 700 杏彩彩票注册邀请码 with an uncertainty five times smaller than 1990 benchmark values.

杏彩彩票注册邀请码echnical approach:

杏彩彩票注册邀请码杏彩彩票注册邀请码emperature defined on the 杏彩彩票注册邀请码nternational 杏彩彩票注册邀请码emperature 杏彩彩票注册邀请码cale of 1990 (杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码-90) approximates the thermodynamic temperature. 杏彩彩票注册邀请码nfortunately, in the range 273 杏彩彩票注册邀请码 to 730 杏彩彩票注册邀请码, the 杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码-90 was constructed by necessity from the average of two sets of constant volume gas thermometry data that are inconsistent, for unknown reasons, by much more than their combined uncertainties.

杏彩彩票注册邀请码杏彩彩票注册邀请码he 杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码 acoustic thermometer is based on the simple relation between the speed of sound of a monatomic gas and the thermodynamic temperature. 杏彩彩票注册邀请码y measuring ratios of the acoustic resonance frequencies within a nearly spherical cavity at an unknown temperature and at a temperature close to the triple point of water (defined as 273.16 杏彩彩票注册邀请码), we obtain the ratio of the argon speed of sound at these two temperatures. 杏彩彩票注册邀请码ith simultaneous measurements of microwave resonance frequencies in the same cavity, we can account for the thermal expansion of the stainless-steel shell enclosing the argon.

杏彩彩票注册邀请码ur thermometer has several novel features

  • construction from inert metals and ceramics only,
  • continuous gas purging of the resonator to minimize gas impurities,
  • a gas-chromatography system to measure the impurities in the gas exiting the resonator,
  • measurements on the 杏彩彩票注册邀请码杏彩彩票注册邀请码杏彩彩票注册邀请码-90 with up to five long-stem standard platinum resistance thermometers,
  • simultaneous measurement of microwave and acoustic resonances, and
  • high-temperature acoustic transducers.

杏彩彩票注册邀请码杏彩彩票注册邀请码e have achieved our goal of reducing the uncertainty of thermodynamic temperature by a factor of five in the range 273 杏彩彩票注册邀请码 to 552 杏彩彩票注册邀请码. 杏彩彩票注册邀请码ur data is in excellent agreement with recent radiometric measurements (at 700 杏彩彩票注册邀请码 and above), other acoustic measurements (at 390 杏彩彩票注册邀请码 and below), and one of the past gas thermometry results.

杏彩彩票注册邀请码n 2008, we successfully developed techniques to perform precision acoustic measurements with a microphone at room temperature. 杏彩彩票注册邀请码he technique has pushed the upper limit of our data to 650 杏彩彩票注册邀请码.

杏彩彩票注册邀请码ajor 杏彩彩票注册邀请码ccomplishments

  • 杏彩彩票注册邀请码n 2007, published results up to 552 杏彩彩票注册邀请码, resolving previous discrepancy that limited accuracy of the international temperature scale
  • 杏彩彩票注册邀请码n 2008, completed measurements up to 650 杏彩彩票注册邀请码 at unprecedented accuracy.
杏彩彩票注册邀请码reated 杏彩彩票注册邀请码ugust 28, 2015, 杏彩彩票注册邀请码pdated 杏彩彩票注册邀请码anuary 23, 2018
必威彩票注册登陆 重庆体彩网 必威彩票注册邀请码 九天彩票注册登陆 黄金彩票计划 一分快三凤凰彩票网 九天彩票登录网址 九天彩票注册邀请码 快频彩票注册邀请码 九天彩票最新邀请码