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Displaying 29726 - 29750 of 143727

The Performance of an Auxiliary Heat Pump Water Heater Installed in a Dual-Tank System in a Net-Zero Energy Residence

January 27, 2016

Author(s)

Tania Ullah, William M. Healy

In the effort to achieve low-energy operation of residential buildings, advanced water heating technologies are vitally important. This paper explores the year-long performance of a 189 L (50 gal) heat pump water heater (HPWH) serving as an auxiliary unit

Handheld Real-Time PCR Device

January 26, 2016

Author(s)

Christian D. Ahrberg, Robert Ilic, Andreas Manz, Pavel Neu?il

Here we report one of the smallest real-time PCR system up to date with approximate size of 100 mm × 60 mm × 33 mm. The system is an autonomous unit requiring an external 12 V power supply. Four simultaneous reactions are performed in form of virtual

Mechanically mediated microwave frequency conversion

January 26, 2016

Author(s)

Florent Q. Lecocq, Jeremy B. Clark, Raymond W. Simmonds, Jose A. Aumentado, John D. Teufel

We report the observation of efficient and low-noise frequency conversion between two microwave modes, mediated by the motion of a mechanical resonator subjected to radiation pressure. We achieve the coherent conversion of more than 10^{12} photons/s with

Modulating the Electrical Conductivity of Metal-Organic Framework Films with Intercalated Guest P-Systems

January 26, 2016

Author(s)

Zhiyong Guo, Dillip K. Panda, Krishnendu Maity, David Lindsey, T. Gannon Parker, Thomas E. Albrecht-Schmitt, Jorge L. Barreda-Esparza, Peng Xiong, Wei Zhou, Sourav Saha

The access to electroactive metal-organic frameworks (MOFs) and the ability to manipulate their electrical conductivity with external stimuli are vital for the realization of MOF-based sensors and electronic devices. A blue-colored electroactive MOF (BMOF)

Toward Autonomous Mobile Sensor Networks Technology

January 26, 2016

Author(s)

Kamran Sayrafian, Hamid Mahboubi, Amir G. Aghdam

Mobile sensor networking technology has attracted considerable attention in various research communities in recent years due to their widespread applications in civilian and military environments. One objective when using mobile sensors is to obtain

A TWSTFT calibration guideline and the use of a GPS calibrator for UTC TWSTFT link calibration

January 25, 2016

Author(s)

Zhiheng Jiang, Demetrios Matsakis, Victor S. Zhang, Hector Esteban, Dirk Piester, Shinn-Yan Lin

Two-Way Satellite Time and Frequency Transfer (TWSTFT) links were first introduced to the Coordinated Universal Time (UTC) generation in 1999 [1,19]. These TWSTFT links were calibrated by alignment with the corresponding GPS time links, of which the

An Auto-Regressive Moving-Average Time Scale Algorithm (ARMA) for Synchronizing Networked Clocks

January 25, 2016

Author(s)

Judah Levine

I will report on a study of the usefulness of ARMA time scale algorithms to synchronize clocks on a digital network. The algorithm acquires periodic time differences between a local system clock and a remote time server by means of any of the standard

Consultative Committee on Ionizing Radiation: Impact on Radionuclide Metrology

January 25, 2016

Author(s)

Lisa R. Karam, G Ratel

In response to the CIPM MRA, and to improve radioactivity measurements in the face of advancing technologies, the CIPMs consultative committee on ionizing radiation developed a strategic approach to the realization and validation of measurement

Equation of State for the Thermodynamic Properties of trans-1,3,3,3-Tetrafluoropropene [R1234ze(E)]

January 25, 2016

Author(s)

Monika Thol, Eric Lemmon

An equation of state for the calculation of the thermodynamic properties of the hydrofluoro-olefin (HFO) refrigerant R-1234ze(E) is presented. The equation of state (EOS) is expressed in terms of the Helmholtz energy as a function of temperature and

Ethernet Time Transfer through a U.S. Commercial Optical Telecommunications Network, Part 2

January 25, 2016

Author(s)

Marc A. Weiss, Lee Cosart, James Hanssen

There is a need to back up critical timing infrastructure at the national level. This paper provides an update on a joint project employing commercial equipment to send national timing signals through a telecommunication network. This experiment connects

GPS Jamming and GPS Carrier-Phase Time Transfer

January 25, 2016

Author(s)

Jian Yao, Marc A. Weiss, Charles Curry, Judah Levine

This paper studies the impact of GPS jamming on GPS carrier-phase time transfer. To study this issue, at NIST, we have installed a commercial GPS jamming detector since 2014 April. During 2014 April 2015 April, the detector detected more than 100 jamming

Lateral Tip Control Effects in CD-AFM Metrology: The Large Tip Limit

January 25, 2016

Author(s)

Ronald G. Dixson, Ndubuisi G. Orji, Ryan Goldband

Sidewall sensing in CD-AFMs usually involves continuous lateral dithering of the tip or the use of a control algorithm and fast response piezo actuator to position the tip in a manner that resembles touch-triggering of coordinate measuring machine (CMM)

Evaluation of microbial qPCR workflows using engineered Saccharomyces cerevisiae

January 24, 2016

Author(s)

Sandra M. Da Silva, Lindsay Harris, Nathanael David Olson, Steven Lund, Autumn S. Downey, Zvi Kelman, Marc L. Salit, Jayne D. Morrow

Aims: We describe the development and interlaboratory study of modified Saccharomyces cerevisiae as a candidate material to evaluate a full detection workflow including DNA extraction and quantitative polymerase chain reaction (qPCR). Methods and results

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