15,533 results on '"Stephenson P"'
Search Results
2. Superfluid-tight cryogenic receiver with continuous sub-Kelvin cooling for EXCLAIM
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Dahal, Sumit, Ade, Peter A. R., Anderson, Christopher J., Barlis, Alyssa, Barrentine, Emily M., Beeman, Jeffrey W., Bellis, Nicholas, Bolatto, Alberto D., Braianova, Victoria, Breysse, Patrick C., Bulcha, Berhanu T., Cataldo, Giuseppe, Colazo, Felipe A., Chevres-Fernandez, Lee-Roger, Cho, Chullhee, Chmaytelli, Danny S., Connors, Jake A., Costen, Nicholas P., Cursey, Paul W., Ehsan, Negar, Essinger-Hileman, Thomas M., Glenn, Jason, Golec, Joseph E., Hays-Wehle, James P., Hess, Larry A., Jahromi, Amir E., Jenkins, Trevian, Kimball, Mark O., Kogut, Alan J., Kramer, Samuel H., Leung, Nicole, Lowe, Luke N., Mauskopf, Philip D., McMahon, Jeffrey J., Mikula, Vilem, Mirzaei, Mona, Moseley, Samuel H., Mugge-Durum, Jonas W., Nellis, Jacob, Noroozian, Omid, Okun, Kate, Oxholm, Trevor, Parekh, Tatsat, Pen, Ue-Li, Pullen, Anthony R., Rahmani, Maryam, Ramirez, Mathias M., Roberson, Cody, Rodriguez, Samelys, Roselli, Florian, Sapkota, Deepak, Shire, Konrad, Siebert, Gage L., Siddique, Faizah, Sinclair, Adrian K., Somerville, Rachel S., Stephenson, Ryan, Stevenson, Thomas R., Switzer, Eric R., Termini, Jared, Timbie, Peter T., Trenkamp, Justin, Tucker, Carole E., Visbal, Elijah, Volpert, Carolyn G., Watson, Joseph, Weeks, Eric, Wollack, Edward J., Yang, Shengqi, and Yung, Aaron
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Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a balloon-borne telescope designed to survey star formation over cosmological time scales using intensity mapping in the 420 - 540 GHz frequency range. EXCLAIM uses a fully cryogenic telescope coupled to six on-chip spectrometers featuring kinetic inductance detectors (KIDs) to achieve high sensitivity, allowing for fast integration in dark atmospheric windows. The telescope receiver is cooled to $\approx$ 1.7 K by immersion in a superfluid helium bath and enclosed in a superfluid-tight shell with a meta-material anti-reflection coated silicon window. In addition to the optics and the spectrometer package, the receiver contains the magnetic shielding, the cryogenic segment of the spectrometer readout, and the sub-Kelvin cooling system. A three-stage continuous adiabatic demagnetization refrigerator (CADR) keeps the detectors at 100 mK while a $^4$He sorption cooler provides a 900 mK thermal intercept for mechanical suspensions and coaxial cables. We present the design of the EXCLAIM receiver and report on the flight-like testing of major receiver components, including the superfluid-tight receiver window and the sub-Kelvin coolers., Comment: 13 pages, 7 figures, 1 table
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- 2024
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3. Stacking fault segregation imaging with analytical field ion microscopy
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Morgado, F. F., Stephenson, L. T., Bhatt, S., Freysoldt, C., Neumeier, S., Katnagallu, S., Subramanyam, A. P. A., Pietka, I., Hammerschmidt, T., Vurpillot, F., and Gault, B.
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Condensed Matter - Materials Science - Abstract
Stacking faults (SF) are important structural defects that play an essential role in the deformation of engineering alloys. However, direct observation of stacking faults at the atomic scale can be challenging. Here, we use the analytical field ion microscopy (aFIM), including density-functional theory informed contrast estimation, to image local elemental segregation at SFs in a creep-deformed solid solution single crystal alloy of Ni-2 at.% W. The segregated atoms are imaged brightly, and time-of-flight spectrometry allows for their identification as W. We also provide the first quantitative analysis of trajectory aberration, with a deviation of approximately 0.4 nm, explaining why atom probe tomography could not resolve these segregations. Atomistic simulations of substitutional W atoms at an edge dislocation in fcc Ni using an analytic bond-order potential indicate that the experimentally observed segregation is due to the energetic preference of W for the center of the stacking fault, contrasting with e.g., Re segregating to partial dislocations. Solute segregation to SF can hinder dislocation motion, increasing the strength of Ni-based superalloys. Yet direct substitution of Re by W envisaged to lower superalloys' costs, requires extra consideration in alloy design since these two solutes do not have comparable interactions with structural defects during deformation.
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- 2024
4. Building Bridges: A Mentor Education Program for Occupational Therapy Practitioners
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Sara J. Stephenson, Cynthia Ivy, Montana Vonier, and Danielle Sweets
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Mentoring in occupational therapy is a crucial role that many practitioners undertake and there is a paucity of mentor education specific to occupational therapists. Authors present an innovative approach to mentor education through a novel three-part online mentor training series. Developed by faculty teaching at Northern Arizona University's (NAU) entry level Occupational Therapy Doctorate (OTD) program, the series incorporated adult learning theory and the stages of mentoring through the lens of occupational therapy. The training series received positive feedback from participants, who found it straightforward, relevant, and applicable to their work settings. Literature emphasizes the increasing demand for quality mentors in occupational therapy as the field expands and the need for mentor education to support professional development. Although there is limited literature on mentor support in occupational therapy, studies in related fields have highlighted the effectiveness of mentor training programs. Authors suggest that the establishment of a mentoring practice community can bridge OTD program expectations with clinical and community practice realities and build mentor capacities. Overall, this work emphasizes the significance of mentorship and the need for formal mentor education in occupational therapy to foster professional growth and ensure the availability of quality mentors for students and new professionals.
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- 2024
5. 'Virtual-Togethering!' Principles for Mitigating Apathy in Graduate Courses
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Sandria S. Stephenson and Zeynep A. Kelani
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The purpose of the study is to understand which of the seven principles by Arthur W. Chickering & Zelda Gamson (1987) are amenable to graduate students in a virtual or other online learning environment, and to evaluate the external validity of the seven principles in the context of online teaching. It concludes with a Hierarchical Principles Model, which repurposes these seven principles for faculty to use as a best practice technique to mitigate apathy in virtual masters' courses. The data are based on a survey of students pursuing graduate courses online. Among the seven principles, encouraging student-faculty interaction is perceived to be the "most" effective for these participants. They also suggest prompt feedback was the "most" appealing and beneficial. They perceived communicating high expectations was the "least" appealing principle, while encouraging student-student interaction created the "most" hindrance to online learning. Moreover, from a generic perspective, managing their own study time and flexibility is what students liked "best" about virtual learning. What they found "least" effective is their perceived limited communication or interaction with faculty. Furthermore, the findings suggest online graduate students, while perceived to be non-traditional, still expect faculty to be constantly engaged online. Although Chickering & Gamson did not give a hierarchical arrangement to their seven principles, the results and efficacy of this study suggests that when adopted to online learning for masters' students, the principles need to be reordered in a Hierarchical Principles Model, which we developed to be used as a best practice approach for online teaching and learning in masters' courses.
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- 2024
6. Pursuit and escape drive fine-scale movement variation during migration in a temperate alpine ungulate.
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John, Christian, Avgar, Tal, Rittger, Karl, Smith, Justine, Stephenson, Logan, Stephenson, Thomas, and Post, Eric
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Altitudinal migration ,Bighorn sheep ,Elevational migration ,Endangered species ,Green wave hypothesis ,Migration phenology ,iSSA ,Animals ,Animal Migration ,Seasons ,Climate Change ,Sheep ,Bighorn ,Ecosystem ,Sheep - Abstract
Climate change reduces snowpack, advances snowmelt phenology, drives summer warming, alters growing season precipitation regimes, and consequently modifies vegetation phenology in mountain systems. Elevational migrants track spatial variation in seasonal plant growth by moving between ranges at different elevations during spring, so climate-driven vegetation change may disrupt historic benefits of migration. Elevational migrants can furthermore cope with short-term environmental variability by undertaking brief vertical movements to refugia when sudden adverse conditions arise. We uncover drivers of fine-scale vertical movement variation during upland migration in an endangered alpine specialist, Sierra Nevada bighorn sheep (Ovis canadensis sierrae) using a 20-year study of GPS collar data collected from 311 unique individuals. We used integrated step-selection analysis to determine factors that promote vertical movements and drive selection of destinations following vertical movements. Our results reveal that relatively high temperatures consistently drive uphill movements, while precipitation likely drives downhill movements. Furthermore, bighorn select destinations at their peak annual biomass and maximal time since snowmelt. These results indicate that although Sierra Nevada bighorn sheep seek out foraging opportunities related to landscape phenology, they compensate for short-term environmental stressors by undertaking brief up- and downslope vertical movements. Migrants may therefore be impacted by future warming and increased storm frequency or intensity, with shifts in annual migration timing, and fine-scale vertical movement responses to environmental variability.
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- 2024
7. High Voltage (~2 kV) field-plated Al0.64Ga0.36N-channel HEMTs
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Alam, Md Tahmidul, Chen, Jiahao, Stephenson, Kenneth, Mamun, Md Abdullah-Al, Mazumder, Abdullah Al Mamun, Pasayat, Shubhra S., Khan, Asif, and Gupta, Chirag
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Physics - Applied Physics - Abstract
High voltage (~2 kV) AlGaN-channel HEMTs were fabricated with 64% Aluminum composition in the channel. The average on-resistance was ~75 ohm. mm (~21 miliohm. cm^2) for LGD = 20 microns. Breakdown voltage reached >3 kV (tool limit) before passivation however it reduced to ~2 kV after SiN surface passivation and field plates. The apparent high breakdown voltage prior to passivation can possibly be attributed to the field plate effect of the charged trap states of the surface. The breakdown voltage and RON demonstrated a strong linear correlation in a scattered plot with ~50 measured transistors. In pulsed IV measurements with 100 microsecond pulse width and 40 V of off-state bias (tool limit), the dynamic RON increased by ~5% compared to DC RON and current collapse was <10%., Comment: 4 pages, 6 figures
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- 2024
8. Seasonal variation of Saturn's Lyman-$\alpha$ brightness
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Stephenson, P., Koskinen, T. T., Brown, Z., Quémerais, E., Lavvas, P., Moses, J. I., Sandel, B., and Yelle, R.
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Astrophysics - Earth and Planetary Astrophysics ,Physics - Space Physics - Abstract
We examine Saturn's non-auroral (dayglow) emissions at Lyman-$\alpha$ observed by the {Cassini/UVIS} instrument from 2004 until 2016, to constrain meridional and seasonal trends in the upper atmosphere. We separate viewing geometry effects from trends driven by atmospheric properties, by applying a multi-variate regression to the observed emissions. The Lyman-$\alpha$ dayglow brightnesses depend on the incident solar flux, solar incidence angle, emission angle, and observed latitude. The emissions across latitudes and seasons show a strong dependence with solar incidence angle, typical of resonantly scattered solar flux and consistent with no significant internal source. We observe a bulge in Ly-$\alpha$ brightness that shifts with the summer season from the southern to the northern hemisphere. We estimate atomic hydrogen optical depths above the methane homopause level for dayside disk observations (2004-2016) by comparing observed Lyman-$\alpha$ emissions to a radiative transfer model. We model emissions from resonantly scattered solar flux and a smaller but significant contribution by scattered photons from the interplanetary hydrogen (IPH) background. During northern summer, inferred hydrogen optical depths steeply decrease with latitude towards the winter hemisphere from a northern hemisphere bulge, as predicted by a 2D seasonal photochemical model. The southern hemisphere mirrors this trend during its summer. However, inferred optical depths show substantially more temporal variation between 2004 and 2016 than predicted by the photochemical model.
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- 2024
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9. GAVEL: Generating Games Via Evolution and Language Models
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Todd, Graham, Padula, Alexander, Stephenson, Matthew, Piette, Éric, Soemers, Dennis J. N. J., and Togelius, Julian
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Computer Science - Artificial Intelligence - Abstract
Automatically generating novel and interesting games is a complex task. Challenges include representing game rules in a computationally workable form, searching through the large space of potential games under most such representations, and accurately evaluating the originality and quality of previously unseen games. Prior work in automated game generation has largely focused on relatively restricted rule representations and relied on domain-specific heuristics. In this work, we explore the generation of novel games in the comparatively expansive Ludii game description language, which encodes the rules of over 1000 board games in a variety of styles and modes of play. We draw inspiration from recent advances in large language models and evolutionary computation in order to train a model that intelligently mutates and recombines games and mechanics expressed as code. We demonstrate both quantitatively and qualitatively that our approach is capable of generating new and interesting games, including in regions of the potential rules space not covered by existing games in the Ludii dataset. A sample of the generated games are available to play online through the Ludii portal., Comment: 9 pages, 4 figures, 4 pages appendices
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- 2024
10. A Near Quantum Limited Sub-GHz TiN Kinetic Inductance Traveling Wave Parametric Amplifier Operating in a Frequency Translating Mode
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Faramarzi, Farzad, Sypkens, Sasha, Stephenson, Ryan, Eom, Byeong H., Leduc, Henry, Chaudhuri, Saptarshi, and Day, Peter
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Quantum Physics - Abstract
We present the design and experimental characterization of a kinetic-inductance traveling-wave parametric amplifier (KI-TWPA) for sub-GHz frequencies. KI-TWPAs amplify signals through nonlinear mixing processes supported by the nonlinear kinetic inductance of a superconducting transmission line. The device described here utilizes a compactly meandered TiN microstrip transmission line to achieve the length needed to amplify sub-GHz signals. It is operated in a frequency translating mode where the amplified signal tone is terminated at the output of the amplifier, and the idler tone at approximately 2.5~GHz is brought out of the cryostat. By varying the pump frequency, a gain of up to 22 dB was achieved in a tunable range from about 450 to 850~MHz. Use of TiN as the nonlinear element allows for a reduction of the required pump power by roughly an order of magnitude relative to NbTiN, which has been used for previous KI-TWPA implementations. This amplifier has the potential to enable high-sensitivity and high-speed measurements in a wide range of applications, such as quantum computing, astrophysics, and dark matter detection.
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- 2024
11. Phase-sensitive pump-probe measurement of the complex nonlinear susceptibility of silicon across the direct band edge
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Cruz, C. D., Stephenson, J. C., and Wahlstrand, J. K.
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Physics - Optics - Abstract
Pump-probe supercontinuum (SC) spectral interferometry in reflection is used to measure time-dependent variations in the complex dielectric function ($n$, $k$) over the visible wavelength range in bulk silicon. Changes in $n$ ($\Delta n$) due to a near infrared pump pulse are derived from transient fluctuations in the reflected SC probe amplitude, as is measured in conventional pump-probe experiments. Additionally, modifications to $k$ ($\Delta k$) are derived from phase shifts in the reflected SC. The ultrafast response is attributed to two-photon absorption ($\Delta k$) and the optical Kerr effect ($\Delta n$), enabling measurement of effective two-photon ($\beta$) and Kerr ($n_2$) coefficients. The onset of strong two-photon absorption as the two-photon energy is tuned through the $E_1$ = 3.4 eV direct band edge of silicon is observed for the first time to our knowledge. These constitute the first measurements of the complex nonlinear response of a bulk medium from reflectivity alone. The technique allows straightforward spectroscopic measurements of the $\chi^{(3)}$ nonlinear response at the surface of absorbing materials., Comment: 10 pages, 5 figures
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- 2024
12. Making Waves: Reflections on SEERNet's Progress towards Enabling Next Generation of Education Research
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Digital Promise, Empirical Education Inc., Stefani Pautz Stephenson, and Jeremy Roschelle
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SEERNet is a network of Digital Learning Platforms, researchers, and practitioners with the vision to leverage DLPs as research infrastructure, enabling researchers to ask and answer important questions about learning in ways that are grounded in realistic, widespread use of learning technologies. A first wave of work established the foundation for the research community. The network looks now towards a second wave of work that clarifies research opportunities and builds capacity for the types of research that can be supported. A third wave seeks to expand the network's efforts towards broader aspirations for better science, engineering, practitioner engagement, and community.
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- 2023
13. Trans and Non-Binary Student Experiences in UK Higher Education. HEPI Report 174
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Higher Education Policy Institute (HEPI) (United Kingdom), Josh Freeman, and Rose Stephenson
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This report explores the experiences of trans and non-binary students across UK higher education. It compiles new and existing data, alongside interviews with students and academics, to outline the journey from application, through study, to post-graduation. It highlights the unique combination of challenges trans and non-binary students face, including lower academic readiness, financial difficulties, mental health issues and challenges in gaining employment. Key recommendations are made for improving inclusion and support, making this report an essential resource for educational institutions committed to enhancing diversity and equity.
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- 2024
14. Testing the simplicity of strategy-proof mechanisms
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Brown, Alexander L., Stephenson, Daniel G., and Velez, Rodrigo A.
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Economics - Theoretical Economics ,Computer Science - Computer Science and Game Theory - Abstract
This paper experimentally evaluates four mechanisms intended to achieve the Uniform outcome in rationing problems (Sprumont, 1991). Our benchmark is the dominant-strategy, direct-revelation mechanism of the Uniform rule. A strategically equivalent mechanism that provides non-binding feedback during the reporting period greatly improves performance. A sequential revelation mechanism produces modest improvements despite not possessing dominant strategies. A novel, obviously strategy-proof mechanism, devised by Arribillaga et al. (2023), does not improve performance. We characterize each alternative to the direct mechanism, finding general lessons about the advantages of real-time feedback and sequentiality of play as well as the potential shortcomings of an obviously strategy-proof mechanism.
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- 2024
15. Non-Monotonic Relations of Galaxy Star Formation, Radius, and Structure at Fixed Stellar Mass
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Stephenson, Jimena, Rodriguez-Puebla, Aldo, Faber, S. M., Primack, Joel R., Avila-Reese, Vladimir, Calette, A. R., Cannarozzo, Carlo, Kakos, James, Cano-Díaz, Mariana, Koo, David C., Shankar, Francesco, and Morell, D. F.
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Astrophysics - Astrophysics of Galaxies - Abstract
We investigate the relation between galaxy structure and star formation rate (SFR) in a sample of $\sim2.9\times10^{4}$ central galaxies with $z<0.0674$ and axial ratios $b/a>0.5$. The star-forming main sequence (SFMS) shows a bend around the stellar mass of $M_\ast\leq{}M_c=2\times10^{10}{}M_{\odot}$. At $M_\ast\leq{}M_c$ the SFMS follows a power-law $\text{SFR}\propto{}M_\ast^{0.85}$, while at higher masses it flattens. $M_c$ corresponds to a dark matter halo mass of $M_\text{vir}\sim{}10^{11.8}M_{\odot}$ where virial shocks occurs. Some galaxy structure (e.g., half-light radius, $R_e$) exhibits a non-monotonic dependence across the SFMS at a fixed $M_\ast$. We find $\text{SFR}\propto{R_e^{-0.28}}$ at fixed $M_\ast$, consistent with the global Kennicutt-Schmidt (KS) law. This finding suggests that galaxy sizes contribute to the scatter of the SFMS. However, at $M_\ast>M_c$ the relationship between SFR and $R_e$ diminishes. Low-mass galaxies above the mean of the SFMS have smaller radii, exhibit compact and centrally concentrated profiles resembling green valley (GV) and quiescent galaxies at the same mass, and have higher $M_{\text{H}_2}/M_\text{HI}$. Conversely, those below the SFMS exhibit larger radii, lower densities, have no GV or quiescent counterparts at their mass and have lower $M_{\text{H}_2}/M_\text{HI}$. The above data suggest two pathways for quenching low-mass galaxies, $M_\ast\leq{}M_c$: a fast one that changes the morphology on the SFMS and a slow one that does not. Above $M_c$, galaxies below the SFMS resemble GV and quiescent galaxies structurally, implying that they undergo a structural transformation already within the SFMS. For these massive galaxies, CG are strongly bimodal, with SFMS galaxies exhibiting negative color gradients, suggesting most star formation occurs in their outskirts, maintaining them within the SFMS., Comment: 30 pages, 28 figures, submitted to MNRAS
- Published
- 2024
16. Further Understanding of a Local Gaussian Process Approximation: Characterising Convergence in the Finite Regime
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Stephenson, Anthony, Allison, Robert, and Pyzer-Knapp, Edward
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Mathematics - Statistics Theory ,Statistics - Machine Learning - Abstract
We show that common choices of kernel functions for a highly accurate and massively scalable nearest-neighbour based GP regression model (GPnn: \cite{GPnn}) exhibit gradual convergence to asymptotic behaviour as dataset-size $n$ increases. For isotropic kernels such as Mat\'{e}rn and squared-exponential, an upper bound on the predictive MSE can be obtained as $O(n^{-\frac{p}{d}})$ for input dimension $d$, $p$ dictated by the kernel (and $d>p$) and fixed number of nearest-neighbours $m$ with minimal assumptions on the input distribution. Similar bounds can be found under model misspecification and combined to give overall rates of convergence of both MSE and an important calibration metric. We show that lower bounds on $n$ can be given in terms of $m$, $l$, $p$, $d$, a tolerance $\varepsilon$ and a probability $\delta$. When $m$ is chosen to be $O(n^{\frac{p}{p+d}})$ minimax optimal rates of convergence are attained. Finally, we demonstrate empirical performance and show that in many cases convergence occurs faster than the upper bounds given here., Comment: 27 pages (10 main text), 8 figures
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- 2024
17. Non-volatile spin transport in a single domain multiferroic
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Husain, Sajid, Harris, Isaac, Meisenheimer, Peter, Mantri, Sukriti, Li, Xinyan, Ramesh, Maya, Behera, Piush, Taghinejad, Hossein, Kim, Jaegyu, Kavle, Pravin, Zhou, Shiyu, Kim, Tae Yeon, Zhang, Hongrui, Stephenson, Paul, Analytis, James G., Schlom, Darrell, Salahuddin, Sayeef, Íñiguez-González, Jorge, Xu, Bin, Martin, Lane W., Caretta, Lucas, Han, Yimo, Bellaiche, Laurent, Yao, Zhi, and Ramesh, Ramamoorthy
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Condensed Matter - Materials Science - Abstract
Antiferromagnets have attracted significant attention in the field of magnonics, as promising candidates for ultralow-energy carriers for information transfer for future computing. The role of crystalline orientation distribution on magnon transport has received very little attention. In multiferroics such as BiFeO$_3$ the coupling between antiferromagnetic and polar order imposes yet another boundary condition on spin transport. Thus, understanding the fundamentals of spin transport in such systems requires a single domain, a single crystal. We show that through Lanthanum(La) substitution, a single ferroelectric domain can be engineered with a stable, single-variant spin cycloid, controllable by an electric field. The spin transport in such a single domain displays a strong anisotropy, arising from the underlying spin cycloid lattice. Our work shows a pathway to understand the fundamental origins of spin transport in such a single domain multiferroic., Comment: 15 pages, 9 figure
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- 2024
18. [Ne v] emission from a faint epoch of reionization-era galaxy: evidence for a narrow-line intermediate mass black hole
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Chisholm, J., Berg, D. A., Endsley, R., Gazagnes, S., Richardson, C. T., Lambrides, E., Greene, J., Finkelstein, S., Flury, S., Guseva, N. G., Henry, A., Hutchison, T. A., Izotov, Y. I., Marques-Chaves, R., Oesch, P., Papovich, C., Saldana-Lopez, A., Schaerer, D., and Stephenson, M. G.
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Astrophysics - Astrophysics of Galaxies - Abstract
Here we present high spectral resolution $\textit{JWST}$ NIRSpec observations of GN42437, a low-mass (log(M$_\ast/M_\odot)=7.9$), compact ($r_e < 500$pc), extreme starburst galaxy at $z=5.59$ with 13 emission line detections. GN42437 has a low-metallicity (5-10% Z$_\odot$) and its rest-frame H$\alpha$ equivalent width suggests nearly all of the observed stellar mass formed within the last 3 Myr. GN42437 has an extraordinary 7$\sigma$ significant [Ne V] 3427 $\mathring{\rm A}$ detection. The [Ne V] line has a rest-frame equivalent width of $11\pm2\mathring{\rm A}$, [Ne V]/H$\alpha =0.04\pm0.007$, [Ne V]/[Ne III] 3870$\mathring{\rm A} = 0.26\pm0.04$, and [Ne V]/He II 4687 $\mathring{\rm A} = 1.2\pm0.5$. Ionization from massive stars, shocks, or high-mass X-ray binaries cannot simultaneously produce these [Ne V] and low-ionization line ratios. Reproducing the complete nebular structure requires both massive stars and accretion onto a black hole. We do not detect broad lines nor do the traditional diagnostics indicate that GN42437 has an accreting black hole. Thus, the very-high-ionization emission lines powerfully diagnose faint narrow-line black holes at high-redshift. We approximate the black hole mass in a variety of ways as log(M$_{\rm BH}/M_\odot) \sim 5-7$. This black hole mass is consistent with local relations between the black hole mass and the observed velocity dispersion, but significantly more massive than the stellar mass would predict. Very-high-ionization emission lines may reveal samples to probe the formation and growth of the first black holes in the universe., Comment: 18 pages, submitted to MNRAS. Comments encouraged
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- 2024
19. A 4-8 GHz Kinetic Inductance Travelling-Wave Parametric Amplifier Using Four-Wave Mixing with Near Quantum-Limit Noise Performance
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Faramarzi, Farzad, Stephenson, Ryan, Sypkens, Sasha, Eom, Byeong H., LeDuc, Henry, and Day, Peter
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Quantum Physics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Kinetic inductance traveling-wave parametric amplifiers (KI-TWPA) have a wide instantaneous bandwidth with near quantum-limited performance and a relatively high dynamic range. Because of this, they are suitable readout devices for cryogenic detectors and superconducting qubits and have a variety of applications in quantum sensing. This work discusses the design, fabrication, and performance of a KI-TWPA based on four-wave mixing in a NbTiN microstrip transmission line. This device amplifies a signal band from 4 to 8~GHz without contamination from image tones, which are produced in a separate higher frequency band. The 4 - 8~GHz band is commonly used to read out cryogenic detectors, such as microwave kinetic inductance detectors (MKIDs) and Josephson junction-based qubits. We report a measured maximum gain of over 20 dB using four-wave mixing with a 1-dB gain compression point of -58 dBm at 15 dB of gain over that band. The bandwidth and peak gain are tunable by adjusting the pump-tone frequency and power. Using a Y-factor method, we measure an amplifier-added noise of $ 0.5 \leq N_{added} \leq 1.5$ photons from 4.5 - 8 GHz.
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- 2024
20. Distributed Model Predictive Control for Cooperative Multirotor Landing on Uncrewed Surface Vessel in Waves
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Stephenson, Jess, Duncan, Nathan T., and Greeff, Melissa
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Computer Science - Robotics ,Electrical Engineering and Systems Science - Systems and Control - Abstract
Heterogeneous autonomous robot teams consisting of multirotor and uncrewed surface vessels (USVs) have the potential to enable various maritime applications, including advanced search-and-rescue operations. A critical requirement of these applications is the ability to land a multirotor on a USV for tasks such as recharging. This paper addresses the challenge of safely landing a multirotor on a cooperative USV in harsh open waters. To tackle this problem, we propose a novel sequential distributed model predictive control (MPC) scheme for cooperative multirotor-USV landing. Our approach combines standard tracking MPCs for the multirotor and USV with additional artificial intermediate goal locations. These artificial goals enable the robots to coordinate their cooperation without prior guidance. Each vehicle solves an individual optimization problem for both the artificial goal and an input that tracks it but only communicates the former to the other vehicle. The artificial goals are penalized by a suitable coupling cost. Furthermore, our proposed distributed MPC scheme utilizes a spatial-temporal wave model to coordinate in real-time a safer landing location and time the multirotor's landing to limit severe tilt of the USV.
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- 2024
21. Cumulant Tensors in Partitioned Independent Component Analysis
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Garrote-López, Marina and Stephenson, Monroe
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Mathematics - Statistics Theory ,15A69, 62R01, 62H25 - Abstract
In this work, we explore Partitioned Independent Component Analysis (PICA), an extension of the well-established Independent Component Analysis (ICA) framework. Traditionally, ICA focuses on extracting a vector of independent source signals from a linear combination of them defined by a mixing matrix. We aim to provide a comprehensive understanding of the identifiability of this mixing matrix in ICA. Significant to our investigation, recent developments by Mesters and Zwiernik relax these strict independence requirements, studying the identifiability of the mixing matrix from zero restrictions on cumulant tensors. In this paper, we assume alternative independence conditions, in particular, the PICA case, where only partitions of the sources are mutually independent. We study this case from an algebraic perspective, and our primary result generalizes previous results on the identifiability of the mixing matrix.
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- 2024
22. Significant noise improvement in a Kinetic Inductance Phonon-Mediated detector by use of a wideband parametric amplifier
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Ramanathan, Karthik, Wen, Osmond, Aralis, Taylor, Thakur, Ritoban Basu, Bumble, Bruce, Chang, Yen-Yung, Day, Peter K., Eom, Byeong Ho, LeDuc, Henry G., Sandoval, Brandon J., Stephenson, Ryan, and Golwala, Sunil R.
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Physics - Instrumentation and Detectors ,Astrophysics - Instrumentation and Methods for Astrophysics ,High Energy Physics - Experiment - Abstract
Microwave Kinetic Inductance Detectors (MKIDs) have been demonstrated as capable phonon sensors when coupled to crystalline substrates, and have been proposed as detectors for next-generation rare-event searches such as for the direct detection of dark matter. These Kinetic Inductance Phonon Mediated (KIPM) detector designs, favoring large superconducting absorber volumes and high readout powers, are oftentimes limited in their sensitivity by low temperature amplifier noise introduced in the signal readout chain. We report here an effort to couple a wideband Kinetic Inductance Travelling Wave Parametric Amplifier (KI-TWPA), operated near the Standard Quantum Limit of minimal added amplifier noise, to sensors spanning a 70 MHz bandwidth at 3.5 GHz. This results in a ~5x improvement in the inferred detector energy resolution in the best sensor and highlights the potential of constructing O(100) meV resolving phonon-mediated particle detectors. We detail limitations introduced by lossy passive components, degraded RF responsivity, and microphysical noise sources like two-level systems (TLS), in achieving ultimate quantum-limited system noise levels., Comment: 7 pages, 4 figures
- Published
- 2024
23. Reviewing the use of the Brief Religious Coping Scale (Brief RCOPE) across diverse cultures and populations
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Saunders, Nicola and Stephenson, Zoe
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- 2024
- Full Text
- View/download PDF
24. Comprehensive molecular profiling of multiple myeloma identifies refined copy number and expression subtypes
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Skerget, Sheri, Penaherrera, Daniel, Chari, Ajai, Jagannath, Sundar, Siegel, David S., Vij, Ravi, Orloff, Gregory, Jakubowiak, Andrzej, Niesvizky, Ruben, Liles, Darla, Berdeja, Jesus, Levy, Moshe, Wolf, Jeffrey, Usmani, Saad Z., Christofferson, Austin W., Nasser, Sara, Aldrich, Jessica L., Legendre, Christophe, Benard, Brooks, Miller, Chase, Turner, Bryce, Kurdoglu, Ahmet, Washington, Megan, Yellapantula, Venkata, Adkins, Jonathan R., Cuyugan, Lori, Boateng, Martin, Helland, Adrienne, Kyman, Shari, McDonald, Jackie, Reiman, Rebecca, Stephenson, Kristi, Tassone, Erica, Blanski, Alex, Livermore, Brianne, Kirchhoff, Meghan, Rohrer, Daniel C., D’Agostino, Mattia, Gamella, Manuela, Collison, Kimberly, Stumph, Jennifer, Kidd, Pam, Donnelly, Andrea, Zaugg, Barbara, Toone, Maureen, McBride, Kyle, DeRome, Mary, Rogers, Jennifer, Craig, David, Liang, Winnie S., Gutierrez, Norma C., Jewell, Scott D., Carpten, John, Anderson, Kenneth C., Cho, Hearn Jay, Auclair, Daniel, Lonial, Sagar, and Keats, Jonathan J.
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- 2024
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25. Using joint species distribution modelling to predict distributions of seafloor taxa and identify vulnerable marine ecosystems in New Zealand waters
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Stephenson, Fabrice, Bowden, David A., Rowden, Ashley A., Anderson, Owen F., Clark, Malcolm R., Bennion, Matthew, Finucci, Brittany, Pinkerton, Matt H., Goode, Savannah, Chin, Caroline, Davey, Niki, Hart, Alan, and Stewart, Rob
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- 2024
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26. Trends in Burdens of Disease by Transmission Source (USA, 2005–2020) and Hazard Identification for Foods: Focus on Milkborne Disease
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Stephenson, Michele M., Coleman, Margaret E., and Azzolina, Nicholas A.
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- 2024
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27. Protective and Enabling Factors That Facilitate Undercover Police Work: A Qualitative Study
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Cajada, Lucia, Stephenson, Zoe, and Bishopp, Darren
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- 2024
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28. Imaging in pelvic exenteration—a multidisciplinary practice guide from the ESGAR-SAR-ESUR-PelvEx collaborative group
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Nougaret, Stephanie, Lambregts, Doenja M. J., Beets, Geerard L., Beets-Tan, Regina G. H., Blomqvist, Lennart, Burling, David, Denost, Quentin, Gambacorta, Maria A., Gui, Benedetta, Klopp, Ann, Lakhman, Yulia, Maturen, Kate E., Manfredi, Riccardo, Petkovska, Iva, Russo, Luca, Shinagare, Atul B., Stephenson, James A., Tolan, Damian, Venkatesan, Aradhana M., Quyn, Aaron J., and Forstner, Rosemarie
- Published
- 2024
- Full Text
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29. Comparative Safety Analysis of Nabilone Versus Opioids: A Population-Based Cohort Study
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Vozoris, Nicholas T., Fu, Longdi, Austin, Peter C., Stephenson, Anne L., Gill, Sudeep S., Chow, Chung-Wai, Ryan, Clodagh M., and To, Teresa
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- 2024
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30. Archaeological evidence of an ethnographically documented Australian Aboriginal ritual dated to the last ice age
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David, Bruno, Mullett, Russell, Wright, Nathan, Stephenson, Birgitta, Ash, Jeremy, Fresløv, Joanna, Delannoy, Jean-Jacques, McDowell, Matthew C., Mialanes, Jerome, Petchey, Fiona, Arnold, Lee J., Rogers, Ashleigh J., Crouch, Joe, Green, Helen, Urwin, Chris, and Matheson, Carney D.
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- 2024
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31. Recalibration of missing low-frequency variability and trends in the North Atlantic Oscillation
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Eade, R., Stephenson, D. B., Scaife, A. A., and Smith, D. M.
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- 2024
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32. Sexual Agreement Discussions Among Adolescent Sexual Minority Men in the USA
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Washington, Catherine, Gamarel, Kristi E., Darbes, Lynae A., Hightow-Weidman, Lisa B., Sullivan, Patrick, and Stephenson, Rob
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- 2024
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33. Genotypes and phenotypes of motor neuron disease: an update of the genetic landscape in Scotland
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Leighton, Danielle J., Ansari, Morad, Newton, Judith, Cleary, Elaine, Stephenson, Laura, Beswick, Emily, Carod Artal, Javier, Davenport, Richard, Duncan, Callum, Gorrie, George H., Morrison, Ian, Swingler, Robert, Deary, Ian J., Porteous, Mary, Chandran, Siddharthan, and Pal, Suvankar
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- 2024
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34. Estimation of the electric field in atom probe tomography experiments using charge state ratios
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Tegg, Levi, Stephenson, Leigh T., and Cairney, Julie M.
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Physics - Instrumentation and Detectors ,Condensed Matter - Materials Science - Abstract
(Kingham 1982) provided equations for the probability of observing higher charge states in atom probe tomography (APT) experiments. These "Kingham curves" have wide application in APT, but cannot be analytically transformed to provide the electric field in terms of the easily-measured charge state ratio (CSR). Here we provide a numerical scheme for the calculation of Kingham curves and the variation in electric field with CSR. We find the variation in electric field with CSR is well-described by a simple two or three-parameter equation, and the model is accurate to most elements and charge states. The model is applied to experimental APT data of pure aluminium and a microalloyed steel, demonstrating that the methods described in this work can be easily applied to a variety of APT problems to understand electric field variations.
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- 2024
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35. Modeling future cliff-front waves during sea level rise and implications for coastal cliff retreat rates.
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Dickson, M, Stephenson, W, Thompson, C, Young, A, and Matsumoto, Hironori
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It is often assumed that future coastal cliff retreat rates will accelerate as global sea level rises, but few studies have investigated how SLR (sea level rise) might change cliff-front wave dynamics. Using a new simple numerical model, this study simulates the number and type (breaking, broken, or unbroken) of cliff-front waves under future SLR scenarios. Previous research shows breaking waves deliver more energy to cliffs than broken waves, and unbroken waves generate minimal impact. Here, we investigated six cliff-platform profiles from three regions (USA, New Zealand, and UK) with varied tidal ranges and wave climates. Model inputs included 2013-2100 hindcast/forecast incident wave height and tidal water level, and three future SLR scenarios. Results show the number of both cliff-front breaking and broken waves generally increase for a high-elevation (relative to tide) cliff-platform junction. In contrast, breaking/broken wave occurrence decrease by 38-92% for a near-horizontal shore platform with a low-elevation cliff-platform junction under a high SRL scenario, leading to high (96-97%) unbroken wave occurrence. Overall, results suggest the response of cliff-front waves to future SLR is complex and depends on shore platform geometries and SLR scenarios, indicating that future cliff retreat rates may not homogeneously accelerate under SLR.
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- 2024
36. Gastrulation-stage gene expression in Nipbl+/− mouse embryos foreshadows the development of syndromic birth defects
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Chea, Stephenson, Kreger, Jesse, Lopez-Burks, Martha E, MacLean, Adam L, Lander, Arthur D, and Calof, Anne L
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Reproductive Medicine ,Biomedical and Clinical Sciences ,Cardiovascular ,Congenital Structural Anomalies ,Rare Diseases ,Intellectual and Developmental Disabilities (IDD) ,Genetics ,Pediatric ,Brain Disorders ,Animals ,Mice ,Cell Cycle Proteins ,De Lange Syndrome ,Gastrulation ,Gene Expression ,Mutation ,Phenotype - Abstract
In animal models, Nipbl deficiency phenocopies gene expression changes and birth defects seen in Cornelia de Lange syndrome, the most common cause of which is Nipbl haploinsufficiency. Previous studies in Nipbl+/- mice suggested that heart development is abnormal as soon as cardiogenic tissue is formed. To investigate this, we performed single-cell RNA sequencing on wild-type and Nipbl+/- mouse embryos at gastrulation and early cardiac crescent stages. Nipbl+/- embryos had fewer mesoderm cells than wild-type and altered proportions of mesodermal cell subpopulations. These findings were associated with underexpression of genes implicated in driving specific mesodermal lineages. In addition, Nanog was found to be overexpressed in all germ layers, and many gene expression changes observed in Nipbl+/- embryos could be attributed to Nanog overexpression. These findings establish a link between Nipbl deficiency, Nanog overexpression, and gene expression dysregulation/lineage misallocation, which ultimately manifest as birth defects in Nipbl+/- animals and Cornelia de Lange syndrome.
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- 2024
37. Optimized experiment design and analysis for fully randomized benchmarking
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Kwiatkowski, Alex, Stephenson, Laurent J., Knaack, Hannah M., Collopy, Alejandra L., Bowers, Christina M., Leibfried, Dietrich, Slichter, Daniel H., Glancy, Scott, and Knill, Emanuel
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Quantum Physics - Abstract
Randomized benchmarking (RB) is a widely used strategy to assess the quality of available quantum gates in a computational context. RB involves applying known random sequences of gates to an initial state and using the statistics of a final measurement step to determine an effective depolarizing error per step of the sequence, which is a metric of gate quality. Here we investigate the advantages of fully randomized benchmarking, where a new random sequence is drawn for each experimental trial. The advantages of full randomization include smaller confidence intervals on the inferred step error, the ability to use maximum likelihood analysis without heuristics, straightforward optimization of the sequence lengths, and the ability to model and measure behaviors that go beyond the typical assumption of time-independent error rates. We discuss models of time-dependent or non-Markovian errors that generalize the basic RB model of a single exponential decay of the success probability. For any of these models, we implement a concrete protocol to minimize the uncertainty of the estimated parameters given a fixed time constraint on the complete experiment, and we implement a maximum likelihood analysis. We consider several previously published experiments and determine the potential for improvements with optimized full randomization. We experimentally observe such improvements in Clifford randomized benchmarking experiments on a single trapped ion qubit at the National Institute of Standards and Technology (NIST). For an experiment with uniform lengths and intentionally repeated sequences the step error was $2.42^{+0.30}_{-0.22}\times 10^{-5}$, and for an optimized fully randomized experiment of the same total duration the step error was $2.57^{+0.07}_{-0.06}\times 10^{-5}$. We find a substantial decrease in the uncertainty of the step error as a result of optimized fully randomized benchmarking.
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- 2023
38. Switch Points of Bi-Persistence Matching Distance
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Brooks, Robyn, Hacker, Celia, Landi, Claudia, Mahler, Barbara I., and Stephenson, Elizabeth R.
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Computer Science - Computational Geometry ,Mathematics - Algebraic Topology ,55N31, 62R40 - Abstract
In multi-parameter persistence, the matching distance is defined as the supremum of weighted bottleneck distances on the barcodes given by the restriction of persistence modules to lines with a positive slope. In the case of finitely presented bi-persistence modules, all the available methods to compute the matching distance are based on restricting the computation to lines through pairs from a finite set of points in the plane. Some of these points are determined by the filtration data as they are entrance values of critical simplices. However, these critical values alone are not sufficient for the matching distance computation and it is necessary to add so-called switch points, i.e. points such that on a line through any of them, the bottleneck matching switches the matched pair. This paper is devoted to the algorithmic computation of the set of switch points given a set of critical values. We find conditions under which a candidate switch point is erroneous or superfluous. The obtained conditions are turned into algorithms that have been implemented. With this, we analyze how the size of the set of switch points increases as the number of critical values increases, and how it varies depending on the distribution of critical values. Experiments are carried out on various types of bi-persistence modules., Comment: 30 pages, 10 figures. Comments welcome
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- 2023
39. Nanoporous gold thin films as substrates to analyze liquids by cryo-atom probe tomography
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Woods, E. V., Saksena, A., El-Zoka, A. A., Stephenson, L. T., Schwarz, T. M., Singh, M. P., Aota, L. S., Kim, S. -H., Schneider, J., and Gault, B.
- Subjects
Condensed Matter - Materials Science ,Physics - Applied Physics - Abstract
Cryogenic atom probe tomography (cryo-APT) is being developed to enable nanoscale compositional analyses of frozen liquids. Yet, the availability of readily available substrates that allow for the fixation of liquids while providing sufficient strength to their interface, is still an issue. Here we propose the use of 1-2 microns thick binary alloy film of gold-silver (AuAg) sputtered onto flat silicon, with sufficient adhesion without an additional layer. Through chemical dealloying, we successfully fabricate a nanoporous substrate, with open-pore structure, which is mounted on a microarray of Si posts by lift out in the focused-ion beam, allowing for cryogenic fixation of liquids. We present cryo-APT results obtained after cryogenic sharpening, vacuum cryo-transfer and analysis of pure water on top and inside the nanoporous film. We demonstrate that this new substrate has the requisite characteristics for facilitating cryo-APT of frozen liquids, with a relatively lower volume of precious metals. This complete workflow represents an improved approach for frozen liquid analysis, from preparation of the films to the successful fixation of the liquid in the porous network, to cryo-atom probe tomography.
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- 2023
40. Quasar Sightline and Galaxy Evolution (QSAGE) -- III. The mass-metallicity and fundamental metallicity relation of $z \approx$ 2.2 galaxies
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Stephenson, H. M. O., Stott, J. P., Cullen, F., Bielby, R. M., Amos, N., Dutta, R., Fumagalli, M., Tejos, N., Burchett, J. N., Crain, R. A., and Prochaska, J. X.
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We present analysis of the mass-metallicity relation (MZR) for a sample of 67 [OIII]-selected star-forming galaxies at a redshift range of $z=1.99 - 2.32$ ($z_{\text{med}} = 2.16$) using \emph{Hubble Space Telescope} Wide Field Camera 3 grism spectroscopy from the Quasar Sightline and Galaxy Evolution (QSAGE) survey. Metallicities were determined using empirical gas-phase metallicity calibrations based on the strong emission lines [OII]3727,3729, [OIII]4959,5007 and H$\beta$. Star-forming galaxies were identified, and distinguished from active-galactic nuclei, via Mass-Excitation diagrams. Using $z\sim0$ metallicity calibrations, we observe a negative offset in the $z=2.2$ MZR of $\approx -0.51$ dex in metallicity when compared to locally derived relationships, in agreement with previous literature analysis. A similar offset of $\approx -0.46$ dex in metallicity is found when using empirical metallicity calibrations that are suitable out to $z\sim5$, though our $z=2.2$ MZR, in this case, has a shallower slope. We find agreement between our MZR and those predicted from various galaxy evolution models and simulations. Additionally, we explore the extended fundamental metallicity relation (FMR) which includes an additional dependence on star formation rate (SFR). Our results consistently support the existence of the FMR, as well as revealing an offset of $0.28\pm0.04$ dex in metallicity compared to locally-derived relationships, consistent with previous studies at similar redshifts. We interpret the negative correlation with SFR at fixed mass, inferred from an FMR existing for our sample, as being caused by the efficient accretion of metal-poor gas fuelling SFR at cosmic noon., Comment: 15 pages, 10 figures. This paper has been accepted for publication in MNRAS
- Published
- 2023
41. Cooperative AI via Decentralized Commitment Devices
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Sun, Xinyuan, Crapis, Davide, Stephenson, Matt, Monnot, Barnabé, Thiery, Thomas, and Passerat-Palmbach, Jonathan
- Subjects
Computer Science - Artificial Intelligence ,Computer Science - Cryptography and Security ,Computer Science - Computer Science and Game Theory ,Computer Science - Multiagent Systems - Abstract
Credible commitment devices have been a popular approach for robust multi-agent coordination. However, existing commitment mechanisms face limitations like privacy, integrity, and susceptibility to mediator or user strategic behavior. It is unclear if the cooperative AI techniques we study are robust to real-world incentives and attack vectors. However, decentralized commitment devices that utilize cryptography have been deployed in the wild, and numerous studies have shown their ability to coordinate algorithmic agents facing adversarial opponents with significant economic incentives, currently in the order of several million to billions of dollars. In this paper, we use examples in the decentralization and, in particular, Maximal Extractable Value (MEV) (arXiv:1904.05234) literature to illustrate the potential security issues in cooperative AI. We call for expanded research into decentralized commitments to advance cooperative AI capabilities for secure coordination in open environments and empirical testing frameworks to evaluate multi-agent coordination ability given real-world commitment constraints., Comment: NeurIPS 2023- Multi-Agent Security Workshop
- Published
- 2023
42. Show Me the Money -- An Exploration of the Gender Pay Gap in Higher Education. HEPI Report 171
- Author
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Higher Education Policy Institute (HEPI) (United Kingdom), Durham University (United Kingdom), and Rose Stephenson
- Abstract
This comprehensive report delves into the persistent gender pay gap within the UK's higher education sector. Despite an environment where women are increasingly visible in both student and staff roles, a wage disparity remains, with women earning on average 11.9% less than their male counterparts across all roles. The report quantifies the gap and celebrates the sector's progress which outpaces the national rate of improvement. However, it also uncovers substantial variances across institutions and brings to light the structural and procedural barriers that continue to hinder gender pay equity. Through research and interviews with institutions and recruitment firms, the report identifies best practices and pinpoints areas that demand attention. This report is a call for action, offering strategic recommendations for institutions that aim to understand and bridge the gender pay gap. It is a critical resource for policymakers and institutions, and advocates striving for gender parity in higher education and bey
- Published
- 2024
43. Intersectionality of Self-Reported Food Insecurity and Perceived Stress of College Students at a Land-Grant Southeastern Higher Education Institution during the COVID-19 Pandemic
- Author
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OoNorasak, Kendra, Barr, Makenzie, Pennell, Michael, Hardesty, Dylan, Yokokura, Kotomi, Udarbe, Samantha, and Stephenson, Tammy
- Abstract
College food insecurity (FI) and poor psychosocial health are prevalent public health issues in the U.S., yet often overlooked. Since the COVID-19 pandemic, repercussions on these critical inequity issues remain unclear. During the summer months of 2020, this cross-sectional survey examined associations between students' self-reported FI and perceived stress (PSS-10), one aspect of poor psychosocial health. Among respondents, 31.3% were food insecure and 37.8% were laid off or temporarily furloughed. This study adds important findings about college FI and perceived stress to the limited literature regarding college student health during the pandemic. A more rigorous study design with a larger, nationally or regionally representative sample is recommended for future studies. To address both complex issues of college FI and stress, a multifaceted interdisciplinary approach, well-supported by college administrators, would be warranted.
- Published
- 2023
44. The Mindful Interactions (MI) Tool: Promoting Student Mental Health in Tertiary Education
- Author
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Elspeth Stephenson and Helen Yost
- Abstract
This conceptual paper introduces the Mindful Interactions (MI) tool designed to enable university teaching academics to promote student mental health and in so doing, impact positively on academic outcomes. The MI tool is comprised of three elements: "understandings" to provide theoretical guidance which inform pedagogy, "practices" to provide strategies for translating theory into practice, and "guiding principles" which provide a catalyst for critical reflexion, challenge existing beliefs, and create a shared vision from which to work. Relationships are at its core, acknowledging that university students report teacher-student relationships as key to their mental health. Issues related to university student mental health, of which psychological distress is an important component, have been well documented and exacerbated since the onset of COVID-19, increasing demands on universities to meet student mental health needs. It is contended in this paper that understanding the causes of psychological distress, particularly in relation to Adverse Childhood Experiences, offers an alternative lens through which to view student mental health. This lens suggests additional ways of thinking about how university teaching academics and universities might proactively respond to student mental health needs. Cultural Historical Activity Theory informed the theoretical framework for the study, whilst two 'approaches' (the 'Three Pillars of Trauma-informed Care' and 'Trust Based Relational Intervention') along with associated trauma literature underpinned the development of the MI tool.
- Published
- 2023
45. The Use of Multisensory Environments with Individuals with Developmental Disabilities: A Systematic Review
- Author
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Stephenson, Jennifer and Carter, Mark
- Published
- 2024
- Full Text
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46. Childcare use and the social-emotional and behavioural outcomes of late-preterm and early-term born children at age 5: An analysis of the All Our Families longitudinal cohort
- Author
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Stephenson, Nikki, Tough, Suzanne, McMorris, Carly, Williamson, Tyler, McDonald, Sheila, and Metcalfe, Amy
- Published
- 2024
- Full Text
- View/download PDF
47. International Care programs for Pediatric Post-COVID Condition (Long COVID) and the way forward
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Brackel, Caroline L. H., Noij, Lieke C. E., Vijverberg, Susanne J. H., Legghe, Camille L., Maitland-van der Zee, Anke H., van Goudoever, Johannes B., Buonsenso, Danilo, Munblit, Daniel, Sigfrid, Louise, McFarland, Sammie, Anmyr, Lena, Ashkenazi-Hoffnung, Liat, Bellinat, Ana P. N., Dias, Nathália L. S., Edwards, Amy, Fashina, Tomini, Juraški, Romana Gjergja, Gonçalves, Ana L. N., Hansted, Edita, Herczeg, Vivien, Hertting, Olof, Jankauskaite, Lina N., Kaswandani, Nastiti, Kevalas, Rimantas, Krivácsy, Péter, Lorenz, Michael, Malone, Laura A., McVoy, Molly, Miller, David W., Morrow, Amanda K., Nugawela, Manjula D., Oliveira, Carlos R., Oliveira, Pablo R. S., Osmanov, Ismael M., Overmars, Isabella M., Paintsil, Elijah, Pinto Pereira, Snehal M., Prawira, Yogi, Putri, Nina Dwi, Ramos, Regina C. F., Rasche, Marius, Ryd-Rinder, Malin, De Rose, Christina, Samitova, Elmira, Jovanović, Tatjana Savić, Say, Daniela, Scott, Janet T., Shachar-Lavie, Iris, Shafran, Roz, Shmueli, Einat, Snipaitiene, Ausra, Stephenson, Terence, Ténai, Nikolett, Tosif, Shidan, Turkalj, Mirjana, Valentini, Piero, Vasconcelos, Luydson R. S., Villard, Li, Vilser, Daniel, Hashimoto, Simone, and Terheggen-Lagro, Suzanne W. J.
- Published
- 2024
- Full Text
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48. Rotorcraft source noise characterization via acoustic snapshot array: development and evaluation
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Stephenson, James H. and Houston, Mary L.
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- 2024
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49. Morphology shapes community dynamics in early animal ecosystems
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Stephenson, Nile P., Delahooke, Katie M., Barnes, Nicole, Rideout, Benjamin W. T., Kenchington, Charlotte G., Manica, Andrea, and Mitchell, Emily G.
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- 2024
- Full Text
- View/download PDF
50. Climate research on big ocean islands
- Author
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Aucan, Jerome, Ebrahim, Ameer, Kotra, Krishna Kumar, Latai-Niusulu, Anita, Mancina, Carlos A., Mycoo, Michelle, Nashath, Mariyam, Stephenson, Tannecia, and Theys, Sarina
- Published
- 2024
- Full Text
- View/download PDF
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