642 research outputs found
KINETICS OF THE LOWER EXTEREMITIES IN ERGOMETER ROWING DEPEND ON BODY MASS INDEX
The aim of this study was to investigate the influence of body mass index (BMI) on the kinetics of the lower extremities in ergometer rowing. Our results indicate that BMI has a major impact on lower extremity kinetics in ergometer rowing. Significantly increased
knee joint torques with respect to external adduction and internal rotation were found. Furthermore, differences in hip and knee extension torques were found. The results indicate that obese individuals are at higher risk of overloading the knee joint during ergometer rowing
An optimal control perspective on diffusion-based generative modeling
We establish a connection between stochastic optimal control and generative
models based on stochastic differential equations (SDEs) such as recently
developed diffusion probabilistic models. In particular, we derive a
Hamilton-Jacobi-Bellman equation that governs the evolution of the
log-densities of the underlying SDE marginals. This perspective allows to
transfer methods from optimal control theory to generative modeling. First, we
show that the evidence lower bound is a direct consequence of the well-known
verification theorem from control theory. Further, we develop a novel
diffusion-based method for sampling from unnormalized densities -- a problem
frequently occurring in statistics and computational sciences.Comment: Accepted for oral presentation at NeurIPS 2022 Workshop on
Score-Based Method
THE IMPACT OF BODY MASS AND SKILL LEVEL ON ROWING KINEMATICS
Rowing is a non-weight-bearing aerobic full body exercise, which is often recommended for weight loss programs. Previous studies demonstrated that Body Mass Index (BMI) is correlated with changes in the kinematics of humans. We extend this area of research to compare the effect of both BMI and skill-level on the kinematics of the lower extremities during rowing. Findings highlight differences such as knee flexion, knee internal rotation,
hip extension, hip external rotation between normal weight and obese individuals. These findings suggest that injury risks are correlated to body type and previous skill level. This research indicates the need for adjustable setups for the rowing ergometer. This recommendation would not only increase comfort for all types of athletes, but reduce risks of injury and create the necessary conditions to accomplish a proper technique
Discovery of Non-radial pulsations in PQ Andromedae
We have detected pulsations in time-series photometry of the WZ Sge dwarf
nova PQ And. The strongest peak in the power spectrum occurs at a period of
10.5 minutes. Similar periods have been observed in other WZ Sge systems and
are attributed to ZZ Ceti type non-radial pulsations. There is no indication in
the photometry of an approximately 1.7 hour orbital period as reported in
previous spectroscopic observations.Comment: 7 pages, 5 figure
Distinct Contributions of Eroding and Depositional Profiles to Land-Atmosphere CO2 Exchange in Two Contrasting Forests
This work is licensed under a Creative Commons Attribution 4.0 International License.Lateral movements of soil organic C (SOC) influence Earth's C budgets by transporting organic C across landscapes and by modifying soil-profile fluxes of CO2. We extended a previously presented model (Soil Organic C Erosion Replacement and Oxidation, SOrCERO) and present SOrCERODe, a model with which we can project how erosion and subsequent deposition of eroded material can modify biosphere-atmosphere CO2 fluxes in watersheds. The model permits the user to quantify the degree to which eroding and depositional profiles experience a change in SOC oxidation and production as formerly deep horizons become increasingly shallow, and as depositional profiles are buried. To investigate the relative importance of erosion rate, evolving SOC depth distributions, and mineralization reactivity on modeled soil C fluxes, we examine two forests exhibiting distinct depth distributions of SOC content and reactivity, hydrologic regimes and land use. Model projections suggest that, at decadal to centennial timescales: (1) the quantity of SOC moving across a landscape depends on erosion rate and the degree to which SOC production and oxidation at the eroding profile are modified as deeper horizons become shallower, and determines the degree to which depositional profile SOC fluxes are modified; (2) erosional setting C sink strength increases with erosion rate, with some sink effects reaching more than 40% of original profile SOC content after 100 y of a relatively high erosion rate (i.e., 1 mm y−1); (3) even large amounts of deposited SOC may not promote a large depositional profile C sink even with large gains in autochthonous SOC post-deposition if oxidation of buried SOC is not limited; and (4) when modeled depositional settings receive a disproportionately large amount of SOC, simulations of strong C sink scenarios mimic observations of modest preservation of buried SOC and large SOC gains in surficial horizons, suggesting that C sink scenarios have merit in these forests. Our analyses illuminate the importance of cross-landscape linkages between upland and depositional environments for watershed-scale biosphere-atmosphere C fluxes, and emphasize the need for accurate representations and observations of time-varying depth distributions of SOC reactivity across evolving watersheds if we seek accurate projections of ecosystem C balances
Understanding young people's transitions in university halls through space and time
This article contributes to the theoretical discussion about young people's transitions through space and time. Space and time are complex overarching concepts that have creative potential in deepening understanding of transition. The focus of this research is young people's experiences of communal living in university halls. It is argued that particular space-time concepts draw attention to different facets of experience and in combination deepen the understanding of young people's individual and collective transitions. The focus of the article is the uses of the space-time concepts 'routine', 'representation', 'rhythm' and 'ritual' to research young people's experiences. The article draws on research findings from two studies in the North of England. © 2010 SAGE Publications
The Grizzly, March 18, 1988
Pledging Problems Nonexistent • Sexually Speaking • Those Amazing Meisters • Middle States Study Continues • Comprehensive Commiserations • Notes: Come See Mr. Ursinus; MontCo Science Fair in Gear; Forum Lecture • Winter Athletes Earn Kudos • Opener Nears for Women\u27s Lax • Catching Aerobics Fever • Baseball Begins Season • Minivan Makes the Grade • Much Ado About Somethinghttps://digitalcommons.ursinus.edu/grizzlynews/1208/thumbnail.jp
The Grizzly, March 19, 1982
New Room Selection Procedure Instituted • Thefts and Break-ins Challenge Campus Security • Board Activates New Program • Going to the Dogs? • USGA Notes • News Briefs: Special Olympics Returns: Hugger Needed!; Red Cross Bloodmobile Urges Volunteer Donors; Advertising Association Sponsors Career Conference • Newly Formed Astronomy Club Approved by SAC • Bach Birthday Concert • UC Track and Field: A Team to be Reckoned With • Blades Shred F&M • Lacrosse Looking for Improvement • Potsdam Frustrates UC Again • Women\u27s Basketball Takes Second in Cinderella MACs • Aqua Women Achieve Personal Best at MACs and Nationalshttps://digitalcommons.ursinus.edu/grizzlynews/1075/thumbnail.jp
- …