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Search Publications by: Michal Chojnacky (Fed)

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Displaying 1 - 13 of 13

Kerr-induced synchronization of a cavity soliton to an optical reference

December 13, 2023
Author(s)
Gregory Moille, Jordan Stone, Michal J. Chojnacky, Curtis Menyuk, Kartik Srinivasan
The phase-coherent frequency division of a stabilized optical reference laser to the microwave domain is made possible by optical-frequency combs (OFCs). OFC-based clockworks lock one comb tooth to a reference laser, which probes a stable atomic transition

ITS-90 SPRT Calibration from the Ar TP to the Zn FP

March 30, 2023
Author(s)
Michal J. Chojnacky, Tobias Herman, Ken Hill, Steffen Rudtsch, Inseok Yang, Petrus Paulus Maria Steur, Roberto Dematteis, Lopardo Lopardo, Fernando Sparasci, Catherine Martin, Lara Risegari, Januarius Widiatmo, Tohru Nakano, Ikuhiko Saito, Klaus Natorf Quelhas, Patricia Giorgio, Jianping Sun, Jintao Zhang, Jonathan Pearce, Jayne Gray
This is a report to the Consultative Committee for Thermometry (CCT) on the key comparison 9 of SPRT calibration on the International Temperature Scale of 1990 (ITS-90) from 83.8058 K (the Ar triple point) to 692.677 K (the Zn freeze point). The comparison

Calibration Stability of Data Loggers Used for Vaccine Temperature Monitoring

March 6, 2023
Author(s)
Michal J. Chojnacky, Sam Smith, Bethany Rodman, Tobias Herman
Continuous temperature monitoring of vaccines during distribution and storage is critical to ensuring vaccination efficacy. Exposure to inappropriate storage temperatures can degrade vaccine potency, putting products and patients at risk if excursions go

Optimizing Data Logger Setup for Vaccine Temperature Monitoring

September 1, 2015
Author(s)
Michal J. Chojnacky, Luis Chaves Santacruz, W Wyatt Miller, Gregory F. Strouse
Accidental freezing of refrigerated vaccine represents a significant public and private healthcare cost. Freeze-damaged vaccines lose their effectiveness, putting communities at risk. U.S. immunization programs have strengthened vaccine storage and

Data Logger Thermometers for Vaccine Temperature Monitoring

November 23, 2012
Author(s)
Michal J. Chojnacky
Complete and accurate records of vaccine temperature history are vital to preserving drug potency and patient safety, yet many vaccine providers do not use continuous temperature monitoring systems in their vaccine refrigerators. We evaluated the

Thermal Analysis of a Small Pharmaceutical Refrigerator for Vaccine Storage

November 23, 2012
Author(s)
Michal J. Chojnacky
Each year, billions of dollars of vaccines are stored in refrigerators at the facilities of a variety of medical providers. Many vaccines must be maintained in the range 2 °C to 8 °C to retain product potency. As an extension to our study of household and

Thermal Analysis of Refrigeration Systems Used for Vaccine Storage

August 2, 2012
Author(s)
Michal J. Chojnacky, Gregory F. Strouse
The CDC administers over $3 billion worth of vaccines per year through the Vaccines for Children program. Vaccine storage temperature is critical to maintaining drug potency, and as much as one-third of delivered vaccines are wasted due to thermal

The Residual Resistance Ratio of High-Purity Platinum

August 22, 2011
Author(s)
Weston L. Tew, William E. Murdock, Michal J. Chojnacky, Dean C. Ripple
High-purity platinum wire is produced for use in both Standard Platinum Resistance Thermometers (SPRTs) and type S and type R thermocouples. The resistance ratio W(T90) and thermoelectric characteristics of the wire are a function of chemical purity and

Thermal Analysis of Refrigeration Systems Used for Vaccine Storage

November 2, 2009
Author(s)
Michal J. Chojnacky, W Wyatt Miller, Dean C. Ripple, Gregory F. Strouse
Each year, billions of dollars of vaccines are stored in refrigerators at the facilities of a variety of medical providers. Many vaccines must be maintained in the range 2 °C to 8 °C to retain product potency. We have tested the performance of two types of