Research in Physics
RESEARCH ACTIVITIES IN THE DEPARTMENT OF PHYSICS
The Department of Physics has active and vibrant research program in Experimental Nuclear Physics, Computational Physics, and Atmospheric Sciences (Atmospheric Physics, Climate and Weather modeling). The researchers and their areas of research are provided below in alphabetical order
Current Research focus: Investigations in Intermediate Energy Physics. This includes the following activities at Jefferson Lab
- The nucleon Form Factors (FF) program, Experiments E12-09-16, E12-09-19, dedicated to the measurement of the neutron electromagnetic form factor ratio GEn/GMn in double polarized, quasi-elastic 3He(e,e’n)pp scattering at momentum transfers Q2 of 5-10.2 (GeV/c)2, and the neutron to the proton magnetic form factor ratio GMn/GMp in quasi-elastic scattering off the deuteron at Q2 up to 18 (GeV/c)2.
- The Møller experiment E12-09-05, which measures the parity-violating asymmetry APV in the scattering of longitudinally polarized 11 GeV electrons off the atomic electrons in a liquid hydrogen target (Møller scattering),
- The Hall C, GEn Collaboration (E12-11-009) which proposes to extend previous measurements of GEn from deuterium and through recoil polarimetery to Q2 =6.88 (GeV/c)2
- Construction of the Quartz Hodoscope for the trigger system of the Hall-C super HMS spectrometer, a crucial component for the Jefferson Lab 12 GeV physics program in Hall C.
- Jefferson Lab Hall-C SANE experiment. The experiment is dedicated to study the spin structure of the proton. The experiment is in the data analysis phase.
- Other research interests include: (1) Development of nuclear and particle physics instrumentation (2) Medical Physics: Imaging, Application and exploration of nuclear physics potential in medicine. (3) Nuclear Power (4) Physics Education
SOME RELEVENT PUBLICATIONS
- Polarization components in p0 photoproduction at photon energies up to 5.6 GeV, W. Luo et al., Phys. Rev. Lett., 108, 222004 (2012)
- A New Measurement of the p0 Radiative Decay Width”, I. Larin et al., Phys. Rev. Lett., Vol.106, No.16, 2011
- Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV2, A.J.R. Puckett et al. JLAB-PHY-10-1155, May 2010. (Published Jun 18, 2010). 12pp.
Published in Phys. Rev. Lett.104:242301, 2010.
- Applications of quark-hadron duality in F(2) structure function, S.P. Malace et al., JLAB-PHY-09-944, May 2009. (Published Sep 2009). 33pp. Published in Phys. Rev. C80:035207, 2009.
- Probing Quark-Gluon Interactions with Transverse Polarized Scattering. K. Slifer et al.. JLAB-PHY-08-893, Dec 2008. (Published Sep 3, 2010). 5pp. Published in Phys. Rev. Lett.105:101601, 2010.
- Electroproduction of Eta Mesons in the S(11)(1535) Resonance Region at High Momentum Transfer.
M.M. Dalton et al. JLAB-PHY-08-817, Apr 2008. 30pp. Phys. Rev.C80:015205, 2009.
- Neutral Pion Electroproduction in the Resonance Region at High Q2. A.N. Villano et al. JLAB-PHY-09-996, Jun 2009. 40pp. Published in Phys.Rev.C80:035203, 2009.
- Proton spin structure in the resonance region, F.R. Wesselmann et al., Phys. Rev. Lett. 98:132003, 2007
- Proton GE/GM from Beam-Target Asymmetry, M. K. Jones, et al., Phys. Rev. 74:035201, 2006.
- The ratio of proton electromagnetic form factors via recoil polarimetry at Q2=1.13 GeV/c)2”, G. McLachlan, …, A. Ahmidouch, … et al., Nucl. Phys. A764:261-273, 2006.
- Measurements of The Neutron Electric to Magnetic Form-Factor Ratio GEn/GMn from the 2H(e,e'n)1H Reaction to Q2=1.45 (GeV/c)2, B. Plaster et al., Phys.Rev.C73:025205, 2006.
Opportunities for students:- Funding availability, source etc.
Research scholarships are available for qualified students, both graduate and undergraduate.
Research Assistant positions available
The Jefferson Lab Moller collaboration, the Jefferson Lab SANE collaboration, Jefferson Lab – Hall C, NC State University, Hampton University, Argonne National Lab, Rutgers University, Florida International University, Kent State University, Norfolk State University, Old Dominion University, CEA Saclay (France), LNS Saclay (France), IPNO Orsay (France), ISN Grenoble (France), etc …
Dr. Solomon Bililign
Additional information about Dr. Bililign's research can be found here.
Atmospheric Physics and Chemistry Research The Bililign Group
Elucidating the chemical and optical properties of particles produced during combustion (Biomass burning)
With an estimated total climate forcing of +1.1 W•m-2, black carbon (BC) and brown Carbon (BrC) are the most important of human emissions in terms of their climate forcing in the present-day atmosphere; second to CO2. BC is produced during the combustion of carbon-based fuels when oxygen is insufficient for complete combustion, which occurs during biomass burning (BB). In addition to climate forcing, recent observational and modeling efforts have shown that biomass aerosols can strongly affect a storm's lightning activity. Violent tornadoes in the Southeast and Central US during the spring are often accompanied by smoke from biomass burning in Central America. The inclusion of aerosol-cloud-radiation interactions in weather forecasts may help improve the predictability of these extreme events. This can also help improve the timeliness and accuracy of severe weather alerts within future operational forecast systems.
The New NC A&T Smog Chamber (Dimensions 9 Cubic Meters)
In the atmosphere, biomass aerosols from fires are subject to extensive chemical processing in the atmosphere as they are exposed to sunlight, other pollutants, biogenic VOC’s and oxidants such as ozone, hydroxyl radicals, and NOx, causing the particles to evolve chemically and physically. Variations in optical properties of soot particles due to internal mixing in the atmosphere and aging remain highly uncertain, considerably hindering efforts to assess their impact on climate and weather. The laboratory measurement of the detailed optical properties of BB aerosols as they age is extremely important in understanding aerosol climate impacts. This is done using an indoor smog chamber.
The work in our laboratory focuses on:
- The study of chemical composition and optical properties of biomass burning aerosols emitted from biomass fuels in East Africa.
- Measurement of particulate scattering, absorption, and extinction across the entire solar spectrum impact regional climate. Most current measurements are limited to a single or few wavelengths, whereas our setup allows measurement of featured absorption cross sections over a wide range of wavelengths.
- Understanding the relationship between the change in optical properties and chemical composition due to aging is still a challenge. Changes in optical properties of soot particles due to internal mixing in the atmosphere and aging will be investigated in this project for the fuel sources in the selected region. Aging of aerosols will be simulated in our indoor smog chamber.
Aerosol optical properties measurement facility
- Ultra-performance liquid chromatography (UPLC) coupled in-line to both a diode array detector (DAD) and high-resolution quadrupole time-of-flight mass spectrometer equipped with an electrospray ionization source will be used to chemically characterize aerosol samples produced in our chamber experiments at UNC-Chapel Hill- Dr. Jason D. Surratt’s Lab.
- Radiative properties of light absorbing carbon aerosols are strongly dependent on the morphological factors (shape and fractal dimensions) which change with the aging of aerosols. The optical properties of soot aerosols as they age and evolve from chain-like structures into closely packed compact clusters will be investigated using T-matrix theory using computational facilities at NCA&T-CSE Department (Dr. Kenneth Flurchick), and images are taken using JSNN facilities.
The Multiphase Heterogeneous Chemistry of SO2 under wintertime conditions
NCA&T Team was part of the Wintertime Investigation of Transport, Emissions, and Reactivity (WINTER 2015). WINTER is an atmospheric chemistry campaign that focuses on wintertime emissions and chemical processes in the Northeastern US. The project has three goals:
(1) to characterize the chemical transformations of wintertime emissions with an equal focus on nocturnal and multiphase processes as on photochemistry;
(2) to assess the dominant mechanism of secondary aerosol formation and quantify the geographical distribution of inorganic and organic aerosol types during winter; and
(3) to provide constraints on wintertime emission inventories for urban areas, power plants and agricultural areas, and characterize the export pathways of primary pollutants to the North Atlantic.
NCA&T team (Jaime Green and Marc Fiddler) will examine the heterogeneous uptake of SO2 in the presence of non-precipitating clouds during the wintertime. Investigations examining the modification of the mass transport, oxidation, and atmospheric lifetimes of SO2 due to winter conditions will take place. Analysis of SO2 emissions from power plants by a comparison of SO2/CO2 and NOy/CO2 between aircraft and Air Markets Database will be investigated.
Jamie Greene in the NSF -C-130 part of WINTER campaign
Dr. Marc Fiddler inside the NSF-C-130- Part of the WINTER Campaign
- Measurement of the Henry's law coefficient and first order loss rate of Isocyanic Acid (HNCO) and other pyrogenic species in the liquid phase in conjunction with
HNCO and inorganic acid measurements during the California Research at the Nexus of Air Quality and Climate (CalNex 2010) and work at NCA&T used the mass Spectrometer Facility (IRC-007)
Mass Spectrometer Facility
- Determine the fate and removal rate of molecules produced in biomass burning via photolysis
The inability to account for the quantity of OH radical observed in the atmosphere has recently prompted an investigation into absorption of visible and near infrared light that leads to photolysis. For molecules that contain N-H and O-H bonds, vibrational overtones can have relatively intense absorption features. For some compounds, absorption due to these overtones, whose wavelengths are in the near IR and visible range of the spectrum, this can introduce enough energy into the molecule to photodissociate it. We use a combination of UV spectroscopy and CRDS to determine absolute vibrational overtone absorption cross sections. Using this data with dissociation information derived from theoretical calculations, we can determine the photolysis lifetimes (J) as a function of solar zenith angle (SZA), altitude, temperature, latitude, and longitude. We have used this method for measuring acetic and peracetic acid, and may expand this work to other relevant compounds.
Hand-held air quality measurements during the Front Range Air Pollution and Photochemistry Experiment (https://www2.acom.ucar.edu/frappe)
NCA&T undergraduates (ASME) and EES PhD Student (now Dr. Singh) participated in the Field campaign in Boulder Colorado in the summer of 2014.
Most Recent Publications
- Damon Michael Smith , Marc Nicholas Fiddler , Kenneth Sexton , Tashell Dowdell, Solomon Bililign, “Construction and Characterization of an Indoor Smog Chamber for Measuring Chemical and Optical Properties of Biomass Burning Aerosols as a Function of Age”
- Tashell Marie Dowdell , Damon Michael Smith , Marc Nicholas Fiddler , Kenneth Sexton 2 and Solomon Bililign, “Characterization of Wall Loss in an Indoor Smog Chamber,”
- Singh, S., Fiddler, M. N., Bililign, S. Measurement of size dependent single scattering albedo of fresh biomass burning aerosols using the extinction-minus-scattering technique with a combination of cavity ring-down spectroscopy and nephelometry. Atmospheric Chemistry and Physics -Published for Discussion (http://www.atmos-chem-phys-discuss.net/acp-2016-298
- Singh, Sujeeta; Fiddler, Marc N.; Smith, Damon; Bililign, Solomon. Error analysis in the determination of aerosol optical properties using cavity ring-down spectroscopy, integrating nephelometry, and the extinction-minus-scattering method, 2014, Aerosol Science and Technology, in press, doi: 10.1080/02786826.2014.984062. http://www.tandfonline.com/doi/abs/10.1080/02786826.2014.984062#.VG4WFmdAeuH
- Bililign, S., Schimmel, K. A., Roop, J. P., Meyerson, G. D. (2015). A university without departments and colleges -A new structure to strengthen disciplinary and interdisciplinary education and research. International Journal for Innovation Education and Research, 3(11).
- Barth, M. C.; Cochran, A. K.; Fiddler, M. N.; Roberts, J. M.; Bililign, S. Numerical modeling of the cloud chemistry effects on isocyanic acid (HNCO), Journal Geophysical Research-Atmospheres, 2013, 118(15), 8688-8701, doi: 10.1002/jgrd.50661 http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50661/abstract
- S. Bililign. The need for interdisciplinary research and education for sustainable human development to deal with global challenges, International Journal of African Development, 2013, Vol. 1, Number 1, Article 8. http://scholarworks.wmich.edu/ijad/vol1/iss1/8/
- Keith A. Schimmel; Muktha Jost; Tyrette Sherlone Carter; Shawn Raquel Watlington; Terrie Ruth McManus; Solomon Bililign; Terry White Worrell; Yuh-Lang Lin. Middle and high school teacher professional development, American Society for Engineering Education Annual Conference and Exposition, 2012, Refereed proceeding.
- S. Bililign, Y.-L. Lin, R. Davis, S. Ilias, L. Kurkalova, Y. Kyei, Y. Rastigeyev and G. Uzochukwu. Effects of global warming on North Carolina, International Journal of Climate Change Impacts and Responses, 2011, Vol. 3 Issue 2, 53-70. http://ijc.cgpublisher.com/product/pub.185/prod.140
- Begashaw, Israel; Fiddler, Marc N.; Bililign, Solomon; Brown, Steven S. Measurement of the fourth O-H overtone absorption cross section in acetic acid using cavity ring-down spectroscopy, The Journal of Physical Chemistry A, 2011, 115, 753-761, doi: 10.1021/jp1087338 http://pubs.acs.org/doi/abs/10.1021/jp1087338
- Fiddler, Marc N.; Begashaw, Israel; Mickens, Matthew A.; Collingwood, Michael S.; Assefa, Zerihun; Bililign, Solomon. Laser spectroscopy for atmospheric and environmental sensing. Sensors, 2009, 9 (12), 10447-10512, doi:10.3390/s91210447 http://www.mdpi.com/1424-8220/9/12/10447
Current Active Collaborations
- Addis Ababa University: Ethiopia; 2004-present: geosciences, atmospheric sciences, and statistical physics.
- UNC-Chapel Hill- Aerosol chemical Properties
- Appalachian State- NSF-IRES
- Colorado State University- Atmospheric Sciences
- NCAR-Atmospheric Chemistry Division: Geoff Tyndall; John Orlando, Mary Barth
- NOAA-ESRL- Atmospheric Chemistry Division: Jim Roberts, Steve Brown, Ranajit Talukda
Dr. Samuel Danagoulian
Current Research focus
The research is mainly associated with scientific program at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory or JLAB, Newport News, VA).
Spin Asymmetries on the Nucleon Experiment (SANE, JLAB experiment E07-003)
A Precise Measurement of the Neutral Pi-meson Lifetime at Jefferson Laboratory (PrimEx, JLAB experiments E-02-103, E-08-023)
Neutron Electromagnetic Form Factor Measurement using 8.8 GeV and 6.6 GeV Beam Energies and BigBite Spectrometer in Hall A (E12-06-121)
Ultra precise measurement of the weak mixing angle by measuring the parity-violating asymmetry APV in Moller Scattering (the Moller Experiment E12-09-05)
Investigation of photodisintegration of deuterium at low energy for the purpose of cancer treatment.
Observation of the 7He hypernucleus by the (e, e’K+) reaction. … A. Ahmidouch, … S. Danagoulian,…A. Gasparian et.al. HKS (JLab E01-011) Collaboration. Submitted to the PRL 2012
Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV. …A. Ahmidouch, … S. Danagoulian, et.al. SANE Collaboration. Phys. Rev. Lett. 108, 222004 (2012)
Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies. …A. Ahmidouch, … S. Danagoulian, et.al. Phys. Rev. C 85, 015202 (2012)
New Measurement of the π0 Radiative Decay Width. … A. Ahmidouch, …S.Danagoulian, …A. Gasparian (PRIMEX Collaboration). Phys. Rev. Lett. 106, 162303 (2011)
Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q2 = 8.5 GeV^2. …A. Ahmidouch, … S. Danagoulian, et.al.SANE Collaboration. Phys.Rev.Lett.104:242301, 2010
“Hypernuclear spectroscopy at JLab Hall C”. … A. Ahmidouch, …S.Danagoulian, …A. Gasparian , et.al.HKS (JLab E01-011) Collaboration, Nucl.Phys.A835:121-128,2010.
Neutral pion electroproduction in the resonance region at highQ2. … A. Ahmidouch,… S. Danagoulian, et.al. Phys.Rev.C80:035203,2009
NSF funding available for students
UMas, MIT, ANL, UVA, Duke U., FIU, UMD, YerPI (Armenia), Tohoku U. (Japan), KEK (Japan) etc.
Dr. Ashot Gasparian
“Photoproduction of Pseudoscalar Mesons off Nuclei at Forward Angles”, S. Gevorkyan, A. Gasparian, L. Gan, I Larin, M. Khandaker Published in: Phys. Rev. C80, (2009), 055201.
Photoproduction of p+p - meson pairs on the proton”, M. Battaglieri, et al. Published in: Phys. Rev. D8, (2009), 072005.
“Neutral Pion Electroproduction in the Resonance Region at High Q2”, A.N. Villano, et al. Published in: Phys. Rev. C80, (2009),035203.
“Hypernuclear spectroscopy at JLab Hall C”, O. Hashimoto, et al. Published in: Nucl.Phys. A835:121-128, 2010.
“Incoherent Photoproduction of Pseudoscalar Mesons off Nuclei at Forward Angles”, S. Gevorkyan, A. Gasparian, L. Gan, I. Larin, M. Khandaker Published in: hep-ph arXiv: 0908.1297, submitted to Phys. Rev. C, in 2010.
Dr. Ken Flurchick
Research Group Members:
Variable Star Systems: B,Griego - Physics MS Student
Energetic Solids A. Crite - CSEPhD Student
Current Research focus:
Variable Star Systems
Utilizing the availability of powerful simple-to-use CCD cameras, synchronization electronics for tracking stars and to connect longitudinally distinct telescopes and small (around 10 to 14 inch reflecting) telescopes, the Global Network of Astronomical Telescopes (GNAT) has completed several full sky surveys. The data pipeline to reduce the photometry data and to analyze the data to find and classify variable stars is an enormous task.
In conjunction with GNAT-MOTESS (Collaboration to conduct a variable star survey which is a deep, wide-field variability survey conducted over several years with a total sky coverage of 300 square degrees. GNAT: is the Global Network of Astronomical Telescopes is a non-profit foundation. MOTESS-Moving Object and Transient Event Search System) .The research here is to analyze the luminosity data from the stellar images in the sky survey. The data analysis includes the identification of spurious data in the image, duplicate data due to overlapping image frames and other bad data in the luminosity data.
These research activities are divided into these major topics:
Stellar Image Data Pipeline: Generation of the luminosity data for the catalogs and the clean-up of MG catalogs. This work is performed in close collaboration with the GNAT team. Several new statistical methods have been developed to analyze the light curves (LC)for spurious data. These methods are being applied to the new catalog data. Also, other work focuses on generating the instrumental photometry data, using the existing data pipeline.
Mining the Catalogs: Using the catalogs to identify variable stars and candidate eclipsing systems.
Eclipsing Star Systems: Using the catalog data plus follow-on observations to identify (and model) the eclipsing star system candidates.
Astronomy Education using the Dynamic Web : This work is in collaboration with Dr. R. Culver at Colorado State University to use the capabilities of the dynamic web to introduce astronomical concepts.
Energetic Solids are a class of molecular solids in which bond dissociation can rapidly occur in response to mechanical energy of a shock compression. This process is poorly understood. Current work is investigating phase changes of the solids prior to the molecular bond dissociation.
Molecular crystals possess the property that the constituents of the lattice, the molecules, bond together in the crystal without altering their intrinsic structure. The study of energetic solids and their behavior under uniform stress due to shock fronts is important. To determine electronic and structural information about these crystals is crucial. As the molecules which make up the constituents of the lattice are not significantly altered by the crystal field, calculations using the generally avaiable DFT functionals should give good results. The caveat for this approach is the level of approximation for any particular functional.
W.F. Perger, S. Vutukuri, Z.A. Dreger , Y.M. Gupta and K. M. Flurchick “First-Principles Vibrational Studies of Pentaerythritol Crystal under Hydrostatic Pressure” Chemical Physics Letters, 422, 10 May 2006, 397-401.
K.M. Flurchick, “DFT Functionals and Molecular Geometries”, Chemical Physics Letters Volume 421, 15 April 2006, 540-543.
Chopade, P.; Flurchick, K.M.; Bikdash, M.; "A Novel Visualization Technique for Smart Power Grid Analytics: Contingency, Security and Economics Aspects", submitted for IEEE 2012 Power and Energy Conference at University of Illinois at Urbana-Champaign, Illinois, February 24 - 25, 2012.
Dr Warren Perger, Michigan Technological University
Dr. Eric Craine, Western Research Inc.
Dr. Roger Culver, Colorado State University
Dr. Lee Bartolottil, East Carolina University
Dr. Abebe Kebede
Ratios in Higher Order Statistics (RHOS) Values of Seismograms for Improved Automatic P-Phase Arival Detection (Dugda Mulugeta and Abebe Kebede)
Submitted to Geoscience and Remote Sensing Letters, 2010
Dr. Yuh-Lang Lin
[PhD students] James Spinks (EES), Galen Smith (EES), Van Nguyen (CSE), Cheikna Baber (EES), Riem Rostom (EES), Patrick Pete (EES), Stephany Taylor (EES); [MS students] Jose Garcia-Rivera (Physics), Nimrod Micael (Physics); [Physics BS students] Delonte Duff (ASME), Justin Riley (ASME), Percey Williams (ASME), Cameron Anderson (ASME); [Recent Graduates] Yi-Chih Huang (PhD-EES, 2012), Cristina Carrasco (MS-Phys), Ian Colon (MS-Phys), Van Nguyen (MS-CSE)
Current Research focus
Research interests include: study of cloud microphysics parameterization, mesoscale dynamics and modeling (orographic rain, gravity and mountain waves, moist convection, wake vortices), severe local storms, tropical waves and cyclones, and forest fires. Research topics include:
Hurricane Research (with collaborators listed): Simulations and Dynamics of
African easterly waves and jets (Collaborators: Dr. G. Tang, Dr. L. Liu; EES student: J. Spinks)
Effects of ocean spray, sea-surface temperature, and orography on tropical cyclone intensity (Dr. Y. Rastigejev, Physics Student: J. Garcia-Rivera, CSE student: V. Ng; ASME student: Justin)
Rapid intensification of hurricanes (Physics MS graduate: C. Carrasco; Physics student: J. Garcia-Rivera)
Orographic and coastal effects on landfalling hurricanes (Collaborator: Dr. L. Liu; CSE student: V. Ng, EES Students: S. Taylor, R. Rostom)
Environments conducive to tornado outbreaks in 2011 and 2012 (Collaborator: Dr. L. Liu; ASME students: Delonte, Percey, Cameron)
Data assimilation for severe storm initiation (EES student: C. Baber)
Effects of aerosols on torndo genesis (Physics student: N. Micael)
Orographic effects on tornado outbreaks (EES student: G. Smith)
Hurricane-induced tornado outbreaks (EES student: P. Pete)
Coupling of Atmospheric & Hydrological Models [Korea collaborators: Dr. Y. Jung, Dr. Kim]
Orographic Rain Dynamics (Taiwan collaborators: Dr. C-S Chen et al.)
Categorization of TCs over Madagascar Mountains (Madagascar collaborators: Rakotomavo, Dr. Raholijao)
Orographic effects on MJO (Taiwan collaborators: Dr. Hsu et al.)
Recent Publications: (Please see http://mesolab.ncat.edu => publications for a complete list)
Five recent publications
Lin, Y.-L., L. Liu, G. Tang, J. Spinks, and W. Jones, 2012: Origin of pre-Debby (2006) African easterly wave and mesoscale convective system. Meteor. Atmos. Phys., in review.
Shen, B.-W., W.-K. Tao, and Y.-L. Lin, 2012: Genesis of twin tropical cyclones as revealed by a global mesoscale model: The role of mixed Rossby gravity waves. J. Geophys. Res., in press.
Shen, B.-W., W.-K. Tao, and Y.-L. Lin, A. Laing, 2012: Genesis of twin tropical cyclones as revealed by a global mesoscale model: The role of mixed Rossby gravity waves. J. Geophys. Res., J. Geophys. Res., Vol. 117, D13114, doi:10.1029/2012JD017450.
Bililign, B., Y.-L. Lin, R. Davis, S. Ilias, L. Kurkalova, Y. Kyei, Y. Rastigeyev, G. Uzochukwu, and S, Bae, 2012: Effects of global warming on North Carolina. Int’l J. Climate Change: Impacts and Responses, Vol. 3, Issue 2, 51-70.
Chen, C.-S., Y.-L. Lin, N.-N. Hsu, C.-L. Liu, and C.-Y. Chen, 2011: Orographic effects on localized heavy rainfall events over southwestern Taiwan on 27 and 28 June 2008 during the post-Mei-Yu period. Atmos. Research, 101, 595-610.
Five representative publications
Lin, Y.-L., and L. Crosby Savage III, 2011: Effects of landfall location and the approach angle of a cyclone vortex encountering a mesoscale mountain range. J. Atmos. Sci., 68, 2095-2106.
Lin, Y.-L., 2007: Mesoscale Dynamics. Cambridge University Press, 630pp.
Lin, Y.-L., S.-Y. Chen, C. M. Hill, and C.-Y. Huang, 2005: Control parameters for tropical cyclones passing over mesoscale mountains, J. Atmos. Sci., 62, 1849-1866.
Lin, Y.-L., 1990: A theory of cyclogenesis forced by diabatic heating. Part II: A semigeostrophic approach. J. Atmos. Sci., 47, 1755-1777.
Lin, Y.-L., R. D. Farley, and H. D. Orville, 1983: Bulk parameterization of the snow field in a cloud model. J. Clima. Appli. Meteor., 22, 1065-1092.
Opportunities for students: Funding availability, source etc.
Integrating NASA Science, Technology and Research in Undergraduate Curriculum and Training (INSTRUCT), NASA
HBCU-RISE Center for Advanced Multi-scale Computational Algorithms (AMCA), NSF
Impact of the NASA Reanalysis (MERRA) Data on the Predictability of Tropical Cyclone Formation and Tropical Waves, NASA (pending)
IGERT in Extreme Weather and Climate Change, NSF (pending)
Battlefield Weather Prediction in Complex Terrain, DoD (pending)
Collaborators – Embedded in the description of current research focus (above)
Dr. Ronald Pedroni
Current Research focus: Experimental nuclear physics; topics include:
Research at the Triangle Universities Nuclear Laboratory (TUNL) located on the campus of Duke University in Durham, NC. Under a collaborative grant with Duke University from the National Science Foundation (NSF) and the Department of Homeland Security (DHS), measurements important for interpreting gamma-ray scans of cargo containers have and are being made at the Duke Free Electron Laser Laboratory (DFELL) using the High Intensity Gamma-ray Source (HIgS). These include measurements of nuclear resonance fluorescence (NRF) cross sections and polarization asymmetries on actinides and other special nuclear materials and high-precision gamma-ray attenuation measurements in the energy range of 3 to 20 MeV.
Research at the Thomas Jefferson National Accelerator Facility (JLab) located in Newport News, VA. There are three topics for this research: a) measurements of the lifetime of the neutral pi meson (p°) (PrimEx) in Experimental Hall B , b) measurements of the lifetime of the eta meson (η) in the new Experimental Hall D, and measurement of the charge radius of the proton.
Publications Related to the NSF/DHS Projects:
Measurement of the 241Am(n,2n) reaction cross section from 7.6 MeV to 14.5 MeV, A.P. Tonchev, C.T. Angell, M. Boswell, A.S. Crowell, B. Fallin, S. Hammond, C.R. Howell, A. Hutcheson, H.J. Karwowski, J.H. Kelley, R.S. Pedroni, W. Tornow, J.A. Becker, D. Dashdorj, J. Kenneally, R.A. Macri, M.A. Stoyer, C.Y. Wu, E. Bond, M.B. Chadwick, J. Fitzpatrick, T. Kawano, R.S. Rundberg, A. Slemmons, D.J. Vieira, and J.B. Wilhelmy, Physical Review C 77, 054610 (2008).
Cross sections for 238U(n,n'γ) and 238U(n,2nγ) reactions at incident neutron energies between 5 and 14 MeV, A. Hutcheson, C. Angell, J.A. Becker, A.S. Crowell, D. Dashdorj, B. Fallin, N. Fotiades, C.R. Howell, H.J. Karwowski, T. Kawano, J.H. Kelley, E. Kwan, R.A. Macri, R.O. Nelson, R.S. Pedroni, A.P. Tonchev and W. Tornow, Physical Review C 80, 014603 (2009).
Neutron-deuteron analyzing power data at 19.0 MeV, G.J. Weisel, W. Tornow, B.J. Crowe, III, A.S. Crowell, J.H. Esterline, C.R. Howell, J.H. Kelley, R.A. Macri, R.S. Pedroni, R.L. Walter and H. Witała, Physical Review C 81, 024003 (2010) .
Discrete deexcitations in 235U below 3 MeV from nuclear resonance fluorescence, E. Kwan, G. Rusev, A.S. Adekola, F. Dönau, S.L. Hammond, C.R. Howell, H.J. Karwowski, J.H. Kelley, R.S. Pedroni, R. Raut, A.P. Tonchev and W. Tornow, Physical Review C 83, 041601 (2011).
Nuclear Data Measurements on Actinides Using The High Intensity Gamma-Ray Source, R.S. Pedroni, A. Adekola, C.W. Arnold, S.L. Hammond, A. Harrell, C.R. Howell, H.J. Karwowski, J. Kelley, E. Kwan, R. Raut, G. Rich, G. Rusev, D. Ticehurst, A.P. Tonchev and W. Tornow, collaboration talk presented at the 4th Annual Academic Research Initiative Grantees Conference from April 26-28, 2011 in Alexandria, VA.
Publications Related to the JLab Projects:
Nuclear targets for a precision measurement of the neutral pion radiative width, P. Martel et al., (PrimEx Coll.: see below), Nuclear Instruments and Methods in Physics Research A612 (2009) 46.
New Measurement of the π0 Radiative Decay Width, I. Larin et al., (PrimEx Coll.: see below), Physical Review Letters 106, 162303 (2011).
Opportunities for students: Some funding is available for one undergraduate student and one graduate student from the NSF/DHS
TUNL (NSF/DHS): Calvin R. Howell, Michael J. Theiren and Werner Tornow.
JLab: Ashot Gasparian, The PrimEx Collaboration, The Hall D/GlueX Collaboration and The Proton Charge Radius Collaboration.
Dr. Chih-Kuan Tung
Field of Specialization
Experimental Biological and Soft Condensed Matter Physics
My research focuses on using quantitative microfluidic experiments to understand how living cells interact with their physical environment, and the underlying universal physics within those systems. By building a microfluidic model that mimics the physical environment of female reproductive tract for mammalian sperm, we work on understanding the guiding principles for surface topography and fluid flow, as well as how viscoelasticity influences sperm migration. We also use the dynamical systems and statistical mechanics to help us draw the underlying physical principles.
Publications on Google Scholar and PubMed.
Dr. Jing Zhang
Current Research focus
1. High Resolution Regional Reanalysis with the WRF-Var Modeling System
With great support from BOEM/DoI, we are conducting an environmental study for the Chukchi/Beaufort Seas with a final goal to generate 30-year high-resolution regional reanalysis with an optimized WRF-Var modeling system. Preliminary results demonstrate that high-resolution regional reanalysis outperforms most global reanalyses as shown below.
2. Arctic Marginal Ice Zone Wind Field Analysis
The Arctic Marginal Ice Zone areas are experiencing substantial changes recently, such as drastic retreat of sea ice, increased storm invasion, a large fluctuation in the surface pressure pattern. In this study we are focusing the area’s wind field analysis, including wind field climatology, changes, and extremes, and its interactions with sea ice changes with funding support from BOEM/DoI.
3. Arctic Storm Activity and its impacts on the Arctic Sea Ice
Synoptic storms play an important contributing role in the rapidly changing Arctic climate system. In this study funded by NSF, we will investigate the physical processes and mechanism of those persistent storm systems over the Arctic Ocean and their impacts on the Arctic sea ice.
4. Storm Activity and Poleward Moisture Transport
Inspired by two studies “Enhanced poleward moisture transport and amplified northern high-latitude wetting trend” (Zhang et al 2012, Nature Climate Change) and “Climatology and Interannual Variability of Arctic Cyclone Activity: 1948–2002” (Zhang et al. 2004, Journal Climate), this study will focus on analyzing the roles of synoptic cyclone systems in poleward moisture transport.
5. Dynamic Downscaling of CMIP5 Climate Scenarios
Sponsored by NSF, a dynamic downscaling of CMIP5 climate scenarios will be downscaled and the downscaled storm activity is a focus in this study.
Most Recent 5 Publications:
Stegall*, S. T., and J. Zhang, 2012, Wind Field Climatology, Changes, and Extremes in the Chukchi/Beaufort Seas and Alaska North Slope during 1979-2009, Journal of Climate, JCLI-D-11-00532, in press.
Zhang, X., J. He, J. Zhang, I. Polaykov, R. Gerdes, J. Inone, & P. Wu, 2012: Enhanced Poleward Moisture Transport Amplifies the Northern High-Latitude Wetting Trend, Nature Climate Change, DOI: 10.1038/NCLIMATE1631, 2012.
Petrich, C., H. Eicken, J. Zhang, J. Krieger, Y. Fukamachi, and K. I. Ohshima, 2011: Coastal landfast sea ice decay and break-up in northern Alaska: Key processes and seasonal prediction, J. Geophys. Res., 117, C02003, doi:10.1029/2011JC007339. 19 PP.
Zhang, J. and X. Zhang, 2010, A Soil Moisture Assimilation Scheme using Satellite-retrieved Skin Temperature in Mesoscale Weather Forecast Model. Atmosphere Research, doi: 10.1016/j.atmosres.2009.09.003.
Bourne*, S.M., U.S. Bhatt, J. Zhang, and R. Thoman, 2010, Surface-based Temperature Inversions in Alaska from a Climate Perspective, Atmosphere Research, doi: 10.1016/j.atmosres.2009.09.013
* student authors
Most Representative 5 Publications:
Zhang, J., U.S. Bhatt, W.V. Tangborn, and C.S. Lingle, 2007, Climate Downscaling for Estimating Glacier Mass Balances in Northwestern North America: Validation with a USGS Benchmark Glacier, Geophysical Research Letters, doi:10.1029/2007GL031139.
Zhang, J. and J.E. Walsh, 2007, Relative Impacts of Vegetation Coverage and Leaf Area Index on Climate Change in a Greener North, Geophysical Research Letters, 34, L15703, doi:10.1029 /2007GL030852.
Zhang, J. and J.E. Walsh, 2006, Thermodynamic and Hydrological Impacts of Increasing Greenness in Northern High Latitudes, Journal Hydrometeorology, 7, 1147-1163.
Zhang, X., J.E. Walsh, J. Zhang, U.S. Bhatt, and M. Ikeda, 2004, Climatology and Interannual Variability of Arctic Cyclone Activity, 1948-2002, Journal Climate, 17, 2300-2317.
Zhang, J., and Y. Ding, 1999: An improved land surface processes model and its simulation experiment: land surface processes model and its "off-line" tests and performance analyses, Acta Meteorologica Sinica, 13, 257-277.