341 research outputs found
FIGURE 4. A–D. U. hirtella s.l., E–G. U. velascoensis, H. U. tridentata, I. U. tricolor, J. U. biceps, K. U. bicolor, L. U. chapadensis, M–N. U. pantaneira, O. U. trinervia. Images C. Rivadavia, D. Rohrbacher, E–G in Unveiling Utricularia amethystina's true colours: a taxonomic revision of one of the largest species complexes (U. sect. Foliosa, Lentibulariaceae)
No full textFIGURE 4. A–D. U. hirtella s.l., E–G. U. velascoensis, H. U. tridentata, I. U. tricolor, J. U. biceps, K. U. bicolor, L. U. chapadensis, M–N. U. pantaneira, O. U. trinervia. Images C. Rivadavia, D. Rohrbacher, E–G. by Marcos Cardoso, J., K. Gonella.Published as part of Baleeiro, Paulo C., Gonella, Paulo M., Sano, Paulo T. & Jobson, Richard W., 2022, Unveiling Utricularia amethystina's true colours: a taxonomic revision of one of the largest species complexes (U. sect. Foliosa, Lentibulariaceae), pp. 29-54 in Phytotaxa 576 (1) on page 43, DOI: 10.11646/phytotaxa.576.1.2, http://zenodo.org/record/744086
Return to physical activity after high tibial osteotomy or unicompartmental knee arthroplasty: a systematic review and pooling data analysis
No full textBACKGROUND: The 2 most common definitive surgical interventions currently performed for the treatment of medial osteoarthritis of the knee are medial opening wedge high tibial osteotomy (HTO) and medial unicompartmental knee arthroplasty (UKA). Research exists to suggest that physically active patients may be suitably indicated for either procedure despite HTO being historically indicated in active patients and UKA being more appropriate for sedentary individuals.PURPOSE: To help consolidate the current indications for both procedures regarding physical activity and to ensure that they are based on the best information presently available.STUDY DESIGN: Systematic review.METHODS: A search of the literature via the MEDLINE, Embase, and PubMed databases was conducted independently by 2 reviewers in accordance with the PRISMA (Preferred Reporting Items for Systematic Meta-Analyses) guidelines. Studies that reported patient physical activity levels with the Tegner activity score were eligible for inclusion. Patient demographics, operative variables, and patient-reported outcome scores were abstracted from the included studies.RESULTS: Thirteen eligible studies were included, consisting of 401 knees that received HTO (399 patients) and 1622 that received UKA (1400 patients). The patients' mean age at surgery was 48.4 years for the HTO group and 60.6 years for the UKA group. Mean follow-up was 46.6 months (HTO) and 53.4 months (UKA). All outcome scores demonstrated an equal or improved score for activity and knee function regardless of the operation performed. Operative variables during HTO had a larger effect on outcome than during UKA.CONCLUSION: Patients who underwent HTO were more physically active pre- and postoperatively, but patients undergoing UKA experienced an overall greater increase in their physical activity levels and knee function according to Tegner and Lysholm scores. Activity after HTO may be influenced by operative factors such as the implant used and the decision to include a graft material in the osteotomy gap, although this requires further research. Some studies found that patients were able to return to physical activity postoperatively despite having an age or body mass index that would traditionally be a relative contraindication for HTO or UKA.</p
Testing for the best alternative with an application to performance measurement
No full textSuppose that we are searching for the maximum of many unknown and analytically untractable quantities or, say, the 'best alternative' among several candidates. If our decision is based on historical or simulated data there is some sort of selection bias and it is not evident if our choice is significantly better than any other. In the present work a large sample test for the best alternative is derived in a rather general setting. The test is demonstrated by an application to financial data and compared with the Jobson-Korkie test for the Sharpe ratios of two asset portfolios. We find that ignoring conditional heteroscedasticity and non-normality of asset returns can lead to misleading decisions. In contrast, the presented test for the best alternative accounts for these kinds of phenomena. --Ergodicity,Gordin's condition,heteroscedasticity,Jobson-Korkie test,Monte Carlo simulation,performance measurement,Sharpe ratio
FIGURE 2. Utricularia amethystina. A in Unveiling Utricularia amethystina's true colours: a taxonomic revision of one of the largest species complexes (U. sect. Foliosa, Lentibulariaceae)
No full textFIGURE 2. Utricularia amethystina. A. Habit showing leaves, stolons, bladder traps and rhizoids, B. Inflorescence, C. Calyx frontal view, D. Corolla frontal view, E. Corolla rear view, F. Bract and bracteoles, G. Bladder trap, H. Capsule, I. Stamens, J. Stamens and ovary showing dorsal stigma surface, K. Seeds.Published as part of Baleeiro, Paulo C., Gonella, Paulo M., Sano, Paulo T. & Jobson, Richard W., 2022, Unveiling Utricularia amethystina's true colours: a taxonomic revision of one of the largest species complexes (U. sect. Foliosa, Lentibulariaceae), pp. 29-54 in Phytotaxa 576 (1) on page 35, DOI: 10.11646/phytotaxa.576.1.2, http://zenodo.org/record/744086
FIGURE 3. A. U. amethystina s.str. Type locality Marau peninsula Bahia, B. U. amethystina s.str. Virua National Park, C. U. amethystina s in Unveiling Utricularia amethystina's true colours: a taxonomic revision of one of the largest species complexes (U. sect. Foliosa, Lentibulariaceae)
No full textFIGURE 3. A. U. amethystina s.str. Type locality Marau peninsula Bahia, B. U. amethystina s.str. Virua National Park, C. U. amethystina s.str. white-flowered specimen, D. U. roraimensis, E. U. amethystina s.str. pink morphotype, F. U. amethystina Type locality, G. U. lindmanii, H–I. U. lunaris, J–N. U. damazioi. J. from Chapada Diamantina, K., M., N. from Chapada dos Veadeiros, L. from Diamantina Plateau.Published as part of Baleeiro, Paulo C., Gonella, Paulo M., Sano, Paulo T. & Jobson, Richard W., 2022, Unveiling Utricularia amethystina's true colours: a taxonomic revision of one of the largest species complexes (U. sect. Foliosa, Lentibulariaceae), pp. 29-54 in Phytotaxa 576 (1) on page 38, DOI: 10.11646/phytotaxa.576.1.2, http://zenodo.org/record/744086
Determining optimal cadence for an individual road cyclist from field data
No full textThe cadence that maximises power output developed at the crank by an individual cyclist is conventionally determined using a laboratory test. The purpose of this study was two-fold: (i) to show that such a cadence, which we call the optimal cadence, can be determined using power output, heart-rate, and cadence measured in the field and (ii) to describe methodology to do so. For an individual cyclist's sessions, power output is related to cadence and the elicited heart-rate using a non-linear regression model. Optimal cadences are found for two riders (83 and 70 revolutions per minute, respectively); these cadences are similar to the riders’ preferred cadences (82–92?rpm and 65–75?rpm). Power output reduces by approximately 6% for cadences 20?rpm above or below optimum. Our methodology can be used by a rider to determine an optimal cadence without laboratory testing intervention: the rider will need to collect power output, heart-rate, and cadence measurements from training and racing sessions over an extended period (>6 months); ride at a range of cadences within those sessions; and calculate his/her optimal cadence using the methodology described or a software tool that implements it
Performance evaluation, portfolio selection, and HARA utility
No full textOur main goal is the generalization of the approach of Jobson and Korkie(1984) for funds performance evaluation. Therefore, we consider the portfolio selection problem of an investor who faces short sales restrictions when choosing among F different investment funds and assume the investor's utility function to be of the HARA type. We develop a performance measure and discuss its relationships to Treynor(1965), Sharpe(1966), Jensen(1968), Prakash and Bear(1986), and Grinblatt and Titman(1989). Particular attention is given to the special case of cubic utility implying skewness preferences. Our findings are illustrated by an empirical example. --HARA utility,performance evaluation,portfolio selection,skewness
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Stranded fossil-fuel assets translate to major losses for investors in advanced economies
No full textThe distribution of ownership of transition risk associated with stranded fossil-fuel assets remains poorly understood. We calculate that global stranded assets as present value of future lost profits in the upstream oil and gas sector exceed US\$1 trillion under plausible changes in expectations about the effects of climate policy. We trace the equity risk ownership from 43,439 oil and gas production assets through a global equity network of 1.8 million companies to their ultimate owners. Most of the market risk falls on private investors, overwhelmingly in OECD countries, including substantial exposure through pension funds and financial markets. The ownership distribution reveals an international net transfer of more than 15% of global stranded asset risk to OECD-based investors. Rich country stakeholders therefore have a major stake in how the transition in oil and gas production is managed, as ongoing supporters of the fossil-fuel economy and potentially exposed owners of stranded assets
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Sample dehumidification to enhance formaldehyde detection by a proton transfer reaction mass spectrometer
No full textA custom built inline sample dehumidifier was connected to a Proton Transfer Reaction - Mass Spectrometer to increase the sensitivity of the PTR-MS to formaldehyde. With the dehumidifier in place, water vapor in the sample line was controlled to a dew point as low as -50 °C resulting in increased sensitivity of the PTRMS to formaldehyde and near removal of water vapor dependent sensitivity of several measureable volatile organic compounds (VOC's), including formaldehyde. Through laboratory testing of the dehumidifier, the optimal operating tube temperature and flow through the tube were determined to be -30 °C and ~ 250 sccm respectfully. At a drift tube field intensity of 120 Td and a drift tube pressure of 2.4 mbar, the normalized sensitivity of the PTR-MS to formaldehyde increased from 8 ncps/ppbV at a dew point of ~11 °C to 35 ncps/ppbV at a dew point of -30 °C. The dehumidifier was implemented during field measurements of formaldehyde during the 2009 SHARP campaign at the University of Houston. Formaldehyde concentrations show diurnal variation and intermittent pollution episodes. The mean mixing ratio for the measurement period was ~2ppbV with peaks as high as ~ 12 ppbV. The detection limit for formaldehyde implementing the dehumidifier was 244 pptV and 105 pptV at a drift tube field intensity of 120 and 80 Td, respectively
High Agreement between Laboratory and Field Estimates of Critical Power in Cycling.
No full textThe purpose of this study was to investigate the level of agreement between laboratory-based estimates of critical power (CP) and results taken from a novel field test. Subjects were fourteen trained cyclists (age 40±7 yrs; body mass 70.2±6.5 kg; V?O2max 3.8±0.5 L · min-1). Laboratory-based CP was estimated from 3 constant work-rate tests at 80%, 100% and 105% of maximal aerobic power (MAP). Field-based CP was estimated from 3 all-out tests performed on an outdoor velodrome over fixed durations of 3, 7 and 12 min. Using the linear work limit (Wlim) vs. time limit (Tlim) relation for the estimation of CP1 values and the inverse time (1/t) vs. power (P) models for the estimation of CP2 values, field-based CP1 and CP2 values did not significantly differ from laboratory-based values (234±24.4 W vs. 234±25.5 W (CP1); P<0.001; limits of agreement [LOA], -10.98-10.8 W and 236±29.1 W vs. 235±24.1 W (CP2); P<0.001; [LOA], -13.88-17.3 W. Mean prediction errors for laboratory and field estimates were 2.2% (CP) and 27% (W'). Data suggest that employing all-out field tests lasting 3, 7 and 12 min has potential utility in the estimation of CP
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