Twin Cities Orthopedics

New Results on the Polyak Stepsize: Tight Convergence Analysis and Universal Function Classes

Abstract. In this paper, we revisit a classical adaptive stepsize strategy for gradient descent: the Polyak stepsize (PolyakGD), originally proposed in Polyak [ USSR Comput. Math. Math. Phys., 9 (1969), pp. 14–29]. We study the convergence behavior of PolyakGD from two perspectiv...

Ideathons as anti-oppressive social work pedagogy: a case study with counternarrative

Anti-oppressive practice is central to social work, yet social work education offers limited opportunities for students to negotiate power and practice collective responses to structural oppression. This qualitative case study examined participants’ experiences of the Digital Jus...

Trapped Topologies in Semiflexible Diblock Copolymer Melts

Abstract Diblock copolymer melts with roughly symmetric composition produce a fluctuating, network-like morphology in the disordered state that converts to lamellae upon cooling through the order–disorder transition. Using dissipative particle dynamics simulations, we document th...

StrucNS reveals interaction-weighted network topology as the driving predictor of absolute stability of natural and de novo proteins

MOTIVATION: Folded protein function requires stability, yet mapping structure and sequence to a fitness landscape remains difficult. The protein fold is the physical realization of complex, spatially-sensitive physicochemical interactions; quantitatively elucidating how these sub...

Fluid–structure interaction dynamics of cervical lymphatic vessel pumping and valvular function

A substantial portion of cerebrospinal fluid (CSF) drains through cervical lymphatic vessels (CLVs), a pathway mediated by basal and dorsal meningeal lymphatics. Impaired drainage along this route has been implicated in ageing, Alzheimer's disease and traumatic brain injury. Desp...

Electron Beam Radiolysis-Assisted Growth of Rutile TiO2 Thin Films

Abstract A new approach for growing crystalline thin films is developed that takes advantage of electron beam radiolysis as a constructive force to rearrange atoms into a crystalline structure. It is demonstrated that by irradiating the surface of a TiO2 film by an electron beam...

Algebraic Localization Implies Exponential Localization in Non-periodic Insulators

Abstract Exponentially-localized Wannier functions are a basis of the Fermi projection of a Hamiltonian consisting of functions which decay exponentially fast in space. In two and three spatial dimensions, it is well understood for periodic insulators that exponentially-localized...

Five-expert PDE: lean formalization

Lean formalization for the explicit solution of the 5-expert PDE.

Level Playing Fields According to American Youth: How Young People Understand and Navigate Meritocracy in Sports

This paper draws on interviews with a large and diverse cross-section of youth (N = 81) in the Twin Cities of Minnesota to explore how American young people understand, experience, and act upon ideals of meritocracy and fairness in youth sports. Qualitative thematic coding yields...

Rebuilding the identifiable city: a trauma–informed framework for shelter, recovery and urban identity after earthquakes

Purpose This paper aims to develop a trauma-informed built-environment framework for post-earthquake recovery in seismic cities, connecting safety, shelter, urban identity, sensory continuity, participation and belonging. Design/methodology/approach An integrative conceptual revi...

Group trends in posttraumatic stress disorder and suicidal ideation over the 10 years after traumatic brain injury among veterans/service members: A VA model systems study

Abstract Objective To identify group‐based patterns in suicidal ideation (SI) and posttraumatic stress disorder (PTSD) symptoms over the first 10 years after traumatic brain injury (TBI) among Veterans and Service Members (V/SMs). Setting V/SMs enrolled in the Department of Veter...

Ancient DNA preservation in the Caribbean

Abstract Ancient DNA (aDNA) analysis has transformed how we study human migration, species dispersals and environmental change, but poor preservation remains a major challenge. This is especially true in tropical settings, where hot and humid conditions accelerate DNA decay. Beca...

Evaluating the Implementation Fidelity of the REJOIN (Using Exercise to Relieve Joint Pain and Improve Aromatase Inhibitor Adherence in Older Breast Cancer Survivors) Pilot Trial

Implementation fidelity (IF), the extent to which interventions are delivered as intended, is essential for assessing program integrity and informing future dissemination/scalability. The REJOIN pilot trial adapted Fit & Strong! ( F&S! ) to deliver an education/exercise intervent...

Areostationary Satellite Station Keeping via a Natural Motion Trajectory and Predictive Control

Areostationary Mars orbit (AMO) satellites will play an important role in future expeditions to the Martian surface due to their strength as navigation and communication satellites. Perturbative forces experienced by an AMOR satellite will cause it to drift from its nominal orbit...

Robust inference and correlates from genetic associations with personality

Personality traits describe stable differences in how people think, feel and behave, and how they interact with and experience their social and physical environments1,2. Many questions remain unanswered about associations between DNA and personality traits, such as their robustne...

Frogs, filters, and faraway lands: honoring the inimitable neuroethology of Peter Narins

This Special Issue of the Journal of Comparative Physiology A continues the journal’s tradition of recognizing pioneering neuroethologists by honoring Peter M. Narins. A former Associate Editor of the Journal and an influential colleague to researchers worldwide, Peter has profou...

Neighborhood effects on Black adolescents’ obesity risk: The mediating role of family experiences

We examined longitudinal associations between neighborhood environments (walkability, area deprivation, and traffic volume) and obesity risk, tested sex differences, and evaluated family experiences as mediators. Participants were 1325 Black youth (52% male; M age = 9.5) and care...

Economic and Environmental Implications of Ride-Hailing and Vehicle Age Limits for Car Sales Markets

Problem definition: Ride-hailing poses significant challenges to Original Equipment Manufacturers (OEMs) as it offers an affordable mobility option, and thus may lead to lower new car ownership. Yet, its more intense competition with the sales of used cars in secondary markets (a...

Tuft dendrite spikes are accompanied by selective input from distinct functional networks

The tuft dendrites of layer 5 neurons can support regenerative events - dendritic spikes - that have been proposed to coordinate context-specific engagement and plasticity within cortical networks. However, it remains unclear whether tuft spikes are accompanied by input activity...

A Dynamic Auroral Ionospheric Density Profile Reveals a Planetary-Scale Cavity at Jupiter

Low-altitude measurements above Jupiter’s main auroras have shown the presence of persistent auroral density depletions. This low density regime strongly favors auroral acceleration by inertial Alfvén waves to explain the predominance of energetic (100–1000 keV) broadband electro...