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  • Compact CH4 sensor system based on a continuous-wave, low power consumption, room temperature interband cascade laser 

    Dong, Lei; Li, Chunguang; Sanchez, Nancy P.; Gluszek, Aleksander K.; Griffin, Robert J.; Tittel, Frank K. (2016)
    A tunable diode laser absorption spectroscopy-based methane sensor, employing a dense-pattern multi-pass gas cell and a 3.3 μm, CW, DFB, room temperature interband cascade laser (ICL), is reported. The optical integration ...
  • Spatial degrees-of-freedom in large-array full-duplex: the impact of backscattering 

    Everett, Evan; Sabharwal, Ashutosh (2016)
    The key challenge for in-band full-duplex wireless communication is managing self-interference. Many designs have employed spatial isolation mechanisms, such as shielding or multi-antenna beamforming, to isolate the ...
  • Differentiating between live and deadᅠMycobacterium smegmatisᅠusing autofluorescence 

    Wong, Cynthia; Ha, Ngan P.; Pawlowski, Michal E.; Graviss, Edward A.; Tkaczyk, Tomasz S. (2016)
    While there have been research efforts to find faster and more efficient diagnostic techniques for tuberculosis (TB), it is equally important to monitor a patient's response to treatment over time, especially with the ...
  • Overtone resonance enhanced single-tube on-beam quartz enhanced photoacoustic spectrophone 

    Zheng, Huadan; Dong, Lei; Sampaolo, Angelo; Patimisco, Pietro; Ma, Weiguang; Zhang, Lei; Yin, Wangbao; Xiao, Liantuan; Spagnolo, Vincenzo; Jia, Suotang; Tittel, Frank K. (2016)
    A single-tube on-beam quartz enhanced photoacoustic spectroscopy (SO-QEPAS) spectrophone, which employs a custom-made quartz tuning fork (QTF) having a prong spacing of 700 μm and operating at the 1st overtone flexural ...
  • State-Space Modeling of Two-Dimensional Vector-Exponential Trajectories 

    Rapisarda, P.; Antoulas, A.C. (2016)
    We solve two problems in modeling polynomial vector-exponential trajectories dependent on two independent variables. In the first one we assume that the data-generating system has no inputs, and we compute a state ...
  • Multi-quartz-enhanced photoacoustic spectroscopy 

    Ma, Yufei; Yu, Xin; Yu, Guang; Li, Xudong; Zhang, Jingbo; Chen, Deying; Sun, Rui; Tittel, Frank K. (2015)
    A multi-quartz-enhanced photoacoustic spectroscopy (M-QEPAS) sensor system for trace gas detection is reported. Instead of a single quartz tuning fork (QTF) as used in QEPAS technique, a dual QTF sensor platform was adopted ...
  • Compact sound-speed sensor for quartz enhanced photoacoustic spectroscopy based applications 

    Liu, Kun; Dong, Lei; Tittel, Frank K. (2015)
    A compact sound-speed sensor based on a phase difference method was developed. The sensor employs a U-shaped stainless steel tube with two holes located on its front and back ends, which serves as a sound wave guide. The ...
  • Video Compressive Sensing for Spatial Multiplexing Cameras Using Motion-Flow Models 

    Sankaranarayanan, Aswin C.; Xu, Lina; Studer, Christoph; Li, Yun; Kelly, Kevin F.; Baraniuk, Richard G. (2015)
    Spatial multiplexing cameras (SMCs) acquire a (typically static) scene through a series of coded projections using a spatial light modulator (e.g., a digital micromirror device) and a few optical sensors. This approach ...
  • Dictionary learning for data recovery in positron emission tomography 

    Valiollahzadeh, SeyyedMajid; Clark, John W. Jr.; Mawlawi, Osama (2015)
    Compressed sensing (CS) aims to recover images from fewer measurements than that governed by the Nyquist sampling theorem. Most CS methods use analytical predefined sparsifying domains such as total variation, wavelets, ...
  • Quartz enhanced photoacoustic H2S gas sensor based on a fiber-amplifier source and a custom tuning fork with large prong spacing 

    Wu, Hongpeng; Sampaolo, Angelo; Dong, Lei; Patimisco, Pietro; Liu, Xiaoli; Zheng, Huadan; Yin, Xukun; Ma, Weiguang; Zhang, Lei; Yin, Wangbao; Spagnolo, Vincenzo; Jia, Suotang; Tittel, Frank K. (2015)
    A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor, employing an erbium-doped fiber amplified laser source and a custom quartz tuning fork (QTF) with its two prongs spaced ∼800 μm apart, is reported. The sensor ...
  • Resting state functional MRI reveals abnormal network connectivity in neurofibromatosis 1 

    Tomson, Steffie N.; Schreiner, Matthew J.; Narayan, Manjari; Rosser, Tena; Enrique, Nicole; Silva, Alcino J.; Allen, Genevera I.; Bookheimer, Susan Y.; Bearden, Carrie E. (2015)
    Neurofibromatosis type I (NF1) is a genetic disorder caused by mutations in the neurofibromin 1 gene at locus 17q11.2. Individuals with NF1 have an increased incidence of learning disabilities, attention deficits, and ...
  • Quartz-enhanced conductance spectroscopy for nanomechanical analysis of polymer wire 

    Zheng, Huadan; Yin, Xukun; Zhang, Guofeng; Dong, Lei; Wu, Hongpeng; Liu, Xiaoli; Ma, Weiguang; Zhang, Lei; Yin, Wangbao; Xiao, Liantuan; Jia, Suotang; Tittel, Frank K. (2015)
    Quartz-enhanced conductance spectroscopy is developed as an analytical tool to investigate dynamic nanomechanical behaviors of polymer wires, in order to determine the glass transition temperature (Tg). A polymethyl ...
  • Quartz-enhanced photoacoustic spectroscopy exploiting tuning fork overtone modes 

    Sampaolo, A.; Patimisco, P.; Dong, L.; Geras, A.; Scamarcio, G.; Starecki, T.; Tittel, F.K.; Spagnolo, V. (2015)
    We report on a quartz-enhanced photoacoustic sensor (QEPAS) based on a custom-made quartz tuning fork (QTF) to operate in both the fundamental and the first overtone vibrational mode resonances. The QTF fundamental mode ...
  • Hollow core waveguide as mid-infrared laser modal beam filter 

    Patimisco, P.; Sampaolo, A.; Giglio, M.; Kriesel, J.M.; Tittel, F.K.; Spagnolo, V. (2015)
    A novel method for mid-IR laser beam mode cleaning employing hollow core waveguide as a modal filter element is reported. The influence of the input laser beam quality on fiber optical losses and output beam profile using ...
  • Estimating a common period for a set of irregularly sampled functions with applications to periodic variable star data 

    Long, James P.; Chi, Eric C.; Baraniuk, Richard G. (2016)
    We consider the problem of estimating a common period for a set of functions sampled at irregular intervals. The motivating problem arises in astronomy, where the functions represent a star’s observed brightness over time ...
  • Compact all-fiber quartz-enhanced photoacoustic spectroscopy sensor with a 30.72 kHz quartz tuning fork and spatially resolved trace gas detection 

    Ma, Yufei; He, Ying; Yu, Xin; Zhang, Jingbo; Sun, Rui; Tittel, Frank K. (2016)
    An ultra compact all-fiber quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor using quartz tuning fork (QTF) with a low resonance frequency of 30.72 kHz was demonstrated. Such a sensor architecture has the advantages ...
  • Crowdsourced estimation of cognitive decline and resilience in Alzheimer's disease 

    Allen, Genevera I.; Amoroso, Nicola; Anghel, Catalina; Balagurusamy, Venkat; Bare, Christopher J.; Beaton, Derek; Bellotti, Roberto; Bennett, David A.; Boehme, Kevin L.; Boutros, Paul C.; Caberlotto, Laura; Caloian, Cristian; Campbell, Frederick; Neto, Elias Chaibub; Chang, Yu-Chuan; Chen, Beibei; Chen, Chien-Yu; Chien, Ting-Ying; Clark, Tim; Das, Sudeshna; Davatzikos, Christos; Deng, Jieyao; Dillenberger, Donna; Dobson, Richard J.B.; Dong, Qilin; Doshi, Jimit; Duma, Denise; Errico, Rosangela; Erus, Guray; Everett, Evan; Fardo, David W.; Friend, Stephen H.; Frӧhlich, Holger; Gan, Jessica; St George-Hyslop, Peter; Ghosh, Satrajit S.; Glaab, Enrico; Green, Robert C.; Guan, Yuanfang; Hong, Ming-Yi; Huang, Chao; Hwang, Jinseub; Ibrahim, Joseph; Inglese, Paolo; Iyappan, Anandhi; Jiang, Qijia; Katsumata, Yuriko; Kauwe, John S.K.; Klein, Arno; Kong, Dehan; Krause, Roland; Lalonde, Emilie; Lauria, Mario; Lee, Eunjee; Lin, Xihui; Liu, Zhandong; Livingstone, Julie; Logsdon, Benjamin A.; Lovestone, Simon; Ma, Tsung-wei; Malhotra, Ashutosh; Mangravite, Lara M.; Maxwell, Taylor J.; Merrill, Emily; Nagorski, John; Namasivayam, Aishwarya; Narayan, Manjari; Naz, Mufassra; Newhouse, Stephen J.; Norman, Thea C.; Nurtdinov, Ramil N.; Oyang, Yen-Jen; Pawitan, Yudi; Peng, Shengwen; Peters, Mette A.; Piccolo, Stephen R.; Praveen, Paurush; Priami, Corrado; Sabelnykova, Veronica Y.; Senger, Philipp; Shen, Xia; Simmons, Andrew; Sotiras, Aristeidis; Stolovitzky, Gustavo; Tangaro, Sabina; Tateo, Andrea; Tung, Yi-An; Tustison, Nicholas J.; Varol, Erdem; Vradenburg, George; Weiner, Michael W.; Xiao, Guanghua; Xie, Lei; Xie, Yang; Xu, Jia; Yang, Hojin; Zhan, Xiaowei; Zhou, Yunyun; Zhu, Fan; Zhu, Hongtu; Zhu, Shanfeng; Alzheimer’s Disease Neuroimaging Initiative (2016)
    Identifying accurate biomarkers of cognitive decline is essential for advancing early diagnosis and prevention therapies in Alzheimer's disease. The Alzheimer's disease DREAM Challenge was designed as a computational ...
  • Changes in Optical Properties of Plasmonic Nanoparticles in Cellular Environments are Modulated by Nanoparticle PEGylation and Serum Conditions 

    Chen, Allen L.; Jackson, Meredith A.; Lin, Adam Y.; Figueroa, Elizabeth R.; Hu, Ying S.; Evans, Emily R.; Asthana, Vishwaratn; Young, Joseph K.; Drezek, Rebekah A. (2016)
    When plasmonic nanoparticles (NPs) are internalized by cells and agglomerate within intracellular vesicles, their optical spectra can shift and broaden as a result of plasmonic coupling of NPs in close proximity to one ...
  • Probing low-density carriers in a single atomic layer using terahertz parallel-plate waveguides 

    Razanoelina, Manjakavahoaka; Bagsican, Filchito Renee; Kawayama, Iwao; Zhang, Xiang; Ma, Lulu; Murakami, Hironaru; Vajtai, Robert; Ajayan, Pulickel M.; Kono, Junichiro; Tonouchi, Masayoshi (2016)
    As novel classes of two-dimensional (2D) materials and heterostructures continue to emerge at an increasing pace, methods are being sought for elucidating their electronic properties rapidly, non-destructively, and ...
  • Lenslet array tunable snapshot imaging spectrometer (LATIS) for hyperspectral fluorescence microscopy 

    Dwight, Jason G.; Tkaczyk, Tomasz S. (2017)
    Snapshot hyperspectral imaging augments pixel dwell time and acquisition speeds over existing scanning systems, making it a powerful tool for fluorescence microscopy. While most snapshot systems contain fixed datacube ...

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