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Search Publications

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Displaying 3701 - 3725 of 74035

Towards Metrological Traceability for DNA Fragment Ratios in GM Quantitation. Part A The Effect of DNA Extraction Methods on the Quantitative Determination of Bt176 Corn by Real-Time PCR

October 12, 2021
Author(s)
Ph Corbisier, W Boothaerts, S Giorio, Heinz Schimmel, M J. Burns, A Baoutina, K R. Emslie, S Furui, Y Kurosawa, Marcia J. Holden, H H. Kim, Y M. Lee, M Kawaharasake, D. W. Sin, J. Wang
An international CCQM-P60 pilot study involving 8 national metrological institutes was organized to investigate if the quantification of genetically modified (GM) corn powder by real-time PCR was affected by the DNA extraction methods applied. Four

Towards Optimization of Patterned Superhydrophobic Surfaces

October 12, 2021
Author(s)
Bharat Bhushan, Michael Nosonovsky, Yong C. Jung
Experimental and theoretical study of wetting properties of patterned Si surfaces with cylindrical flat-top pillars of various sizes and pitch distances is presented. The values of the contact angle (CA), contact angle hysteresis (CAH) and tilt angle (TA)

Toxic Potency Values for Smoke from Products and Materials

October 12, 2021
Author(s)
J L. Neviaser, Richard Gann
Many devices have been used to generate data on the toxic potency of smoke from burning products and materials. This paper critically reviews those apparatus and sorts them by the combustion conditions (related to a type of fire) producing the smoke, the

Transient Phenoxyl Radicals: Formation and Properties in Aqueous Solutions

October 12, 2021
Author(s)
S Steenken, Pedatsur Neta
This chapter discusses the various methods of formation of phenoxyl radicals (oxidation of phenols by metal ions, by free radicals and radical cations, reaction of phenols with hydroxyl radicals, autoxidation of phenols, etc.) and the properties of

Transition-Edge Sensors

October 12, 2021
Author(s)
Kent D. Irwin, Gene C. Hilton
In recent years, superconducting transition-edge sensors (TES) have emerged as powerful, energy-resolving detectors of single photons from the near infrared through gamma rays and sensitive detectors of photon fluxes out to millimeter wavelengths. The TES

Tribological Performance of Head-Disk Interface Due to Nanoasperity Impacts

October 12, 2021
Author(s)
Tze J. Chuang, Stephen M. Hsu
During the track accessing mode ofa hard disk drive, theflying height of the slider over thedisk surface becomes smaller and smaller as the demand in data storage density increases. As aresult, the propensity of glide avalanche is bound to increase when

Tunable Multiferroic Properties in Nanocomposite PbTiO3-CoFe2O4 Epitaxial Thin Films

October 12, 2021
Author(s)
Makoto Murakami, K S. Chang, M A. Aronova, C L. Lin, M-H Yu, Jason Hattrick-Simpers, M. Wuttig, Ichiro Takeuchi, C Gao, S E. Lofland, Leonid A. Bendersky
We report on the synthesis of PbTiO3-CoFe2)4 (PTO-CFO) multiferroic nanocomposite and continuous turning of their ferroic properties as a function of composition on thin-film composition spreads. Highest dielectric constant and non-linear dielectric signal

Tuning the Fragility of Polymer Melts With Antiplasticizer Additives

October 12, 2021
Author(s)
Robert A. Riggleman, K Yoshimoto, Jack F. Douglas, J J. de Pablo
Using molecular dynamics simulations, we have developed and analyzed a model that exhibits antiplasticization behavior by decreasing the glass transition temperature, increasing the density of the system below the glass transition temperature of the pure

Tuning the Mean-Field Energy in a Fermi Gas of Atoms

October 12, 2021
Author(s)
C A. Regal, Deborah S. Jin
An exotic superfluid phase has been predicted for an ultracold gas of fermionic atoms. Experimenters have cooled these gases into the quantum degenerate regime and explored collisional effects. However, quantum mechanical many-body interaction phenomena

Two Sides Ignition Over a Thin PMMA Sheet in Microgravity

October 12, 2021
Author(s)
Y N. Nakamura, Takashi Kashiwagi, S L. Olson, K K. Nishizawa, O -. Fujita
A series of the experiments was conducted in microgravity to study the ignition characteristics of a thin PMMA sheet (thicknesses of 0.2 mm and 0. 4 mm) using a CO2 laser as an external radiant source. Two separate ignition events were observed, the first

Two Stage Forming: Experimental and FE Analysis

October 12, 2021
Author(s)
M C. Oliveira, A J. Baptista, J L. Alves, L F. Menezes, D E. Green, Thomas H. Gnaupel-Herold, Mark Iadicola, Timothy J. Foecke, T B. Stoughton
One of the present challenges in sheet metal forming is to simulate sequential production stages, from the initial blank sheet to the final part ready for assembly. In this context, it is fundamental to evaluate the forming characteristics of the materials

Ultrafast Spin Phenomena in Highly Excited N-Doped GaAs

October 12, 2021
Author(s)
R Bratschitsch, Z Chen, Steven T. Cundiff
We perform time-resolved Faraday rotation exeriments on undoped and n-doped GaAs samples at high optical excitation densities. The Faraday rotation signal linearly increases with optical excitation density. The excitation dependence of the electron g

Ultrasonic Melt Temperature Measurement During Extrusion

October 12, 2021
Author(s)
J Shen, Eric Edwards, C L. Thomas, Anthony J. Bur
An ultrasonics sensor, which can be used at polymer processing temperatures, was developed and used to monitor temperature of a polymer extrudate. This was accomplished by establishing a calibration function between the measured ultrasonics velocity and

Understanding Deviations in Lithographic Patterns Near Interfaces: Characterization of Antireflective Coatings (ARC) and the ARC/Resist Interface

October 12, 2021
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Daniel A. Fischer, S Sambasivan, Eric K. Lin, Wen-Li Wu, Douglas Guerrero, Yijun Wang, R Puligadda
Interactions between a bottom anti-reflective coating (BARC) and a photo-resist can critically impact lithographic patterns. For example, a lithographic pattern can shrink or spread near a BARC interface, a process called undercutting or footing

Universal RNA Reference Materials for Gene Expression

October 12, 2021
Author(s)
M Cronin, K Ghosh, F Sistare, J Quackenbush, V L. Vilker, C D. O'Connell
A NIST sponsored workshop entitled Metrology and Standards Needs for Gene Expression Technologies: Universal RNA Standards was held on March 28-29, 2003 to define the need for standardization of the biological component of RNA based molecular assays

University Involvement in ATP and Effect on Project Outputs

October 12, 2021
Author(s)
F A. Moris, C Chang, Andrew J. Wang
Universities play a key role in the U.S. innovation system. Universities are engaged in research at the scientific and technological frontier. Private companies may choose to collaborate with universities to gain access to eminent researchers and/or to

Unusual DNA Conformations From Intron 21 of the PKD1 Gene Cause Mutagenesis

October 12, 2021
Author(s)
A Bacolla, A Jaworski, A Larson, J P. Jakupciak, C D. O'Connell, R D. Wells
Intron 21 of the polycystic kidney disease 1 (PKD1) gene contains a 2.5 kbp of purine-pyrimidine asymmetry [poly(R-Y)] predicted to adopt unusual DNA structures (slipped, triplexes, tetraplexes)and proposed to cause mutations in the gene. The poly (R-Y)
Displaying 3701 - 3725 of 74035