Correntropy: Implications of nonGaussianity for the moment expansion and deconvolution

Accepted versio

Brain connectivity in positive and negative syndrome schizophrenia.

Accepted versio

Inelastic scattering of 9Li and excitation mechanism of its first excited state

The first measurement of inelastic scattering of 9Li from deuterons at the ISAC facility is reported. The measured angular distribution for the first excited state confirms the nature of excitation to be an E2 transition. The quadrupole deformation parameter is extracted from an analysis of the angular distribution.Web of Scienc

Characteristics, Outcomes, and Severity Risk Factors Associated with SARS-CoV-2 Infection among Children in the US National COVID Cohort Collaborative

Importance: Understanding of SARS-CoV-2 infection in US children has been limited by the lack of large, multicenter studies with granular data. Objective: To examine the characteristics, changes over time, outcomes, and severity risk factors of children with SARS-CoV-2 within the National COVID Cohort Collaborative (N3C). Design, Setting, and Participants: A prospective cohort study of encounters with end dates before September 24, 2021, was conducted at 56 N3C facilities throughout the US. Participants included children younger than 19 years at initial SARS-CoV-2 testing. Main Outcomes and Measures: Case incidence and severity over time, demographic and comorbidity severity risk factors, vital sign and laboratory trajectories, clinical outcomes, and acute COVID-19 vs multisystem inflammatory syndrome in children (MIS-C), and Delta vs pre-Delta variant differences for children with SARS-CoV-2. Results: A total of 1068410 children were tested for SARS-CoV-2 and 167262 test results (15.6%) were positive (82882 [49.6%] girls; median age, 11.9 [IQR, 6.0-16.1] years). Among the 10245 children (6.1%) who were hospitalized, 1423 (13.9%) met the criteria for severe disease: mechanical ventilation (796 [7.8%]), vasopressor-inotropic support (868 [8.5%]), extracorporeal membrane oxygenation (42 [0.4%]), or death (131 [1.3%]). Male sex (odds ratio [OR], 1.37; 95% CI, 1.21-1.56), Black/African American race (OR, 1.25; 95% CI, 1.06-1.47), obesity (OR, 1.19; 95% CI, 1.01-1.41), and several pediatric complex chronic condition (PCCC) subcategories were associated with higher severity disease. Vital signs and many laboratory test values from the day of admission were predictive of peak disease severity. Variables associated with increased odds for MIS-C vs acute COVID-19 included male sex (OR, 1.59; 95% CI, 1.33-1.90), Black/African American race (OR, 1.44; 95% CI, 1.17-1.77), younger than 12 years (OR, 1.81; 95% CI, 1.51-2.18), obesity (OR, 1.76; 95% CI, 1.40-2.22), and not having a pediatric complex chronic condition (OR, 0.72; 95% CI, 0.65-0.80). The children with MIS-C had a more inflammatory laboratory profile and severe clinical phenotype, with higher rates of invasive ventilation (117 of 707 [16.5%] vs 514 of 8241 [6.2%]; P <.001) and need for vasoactive-inotropic support (191 of 707 [27.0%] vs 426 of 8241 [5.2%]; P <.001) compared with those who had acute COVID-19. Comparing children during the Delta vs pre-Delta eras, there was no significant change in hospitalization rate (1738 [6.0%] vs 8507 [6.2%]; P =.18) and lower odds for severe disease (179 [10.3%] vs 1242 [14.6%]) (decreased by a factor of 0.67; 95% CI, 0.57-0.79; P <.001). Conclusions and Relevance: In this cohort study of US children with SARS-CoV-2, there were observed differences in demographic characteristics, preexisting comorbidities, and initial vital sign and laboratory values between severity subgroups. Taken together, these results suggest that early identification of children likely to progress to severe disease could be achieved using readily available data elements from the day of admission. Further work is needed to translate this knowledge into improved outcomes

Matching Pursuit by Undecimated Discrete Wavelet Transform For Arbitrary-Length Time Series

this paper we adapt this approach to make it appropriate to the decomposition of a discrete-time time series of subtidal sea levels. As elements of the `waveform&apos; dictionary we choose basis sequences arising from the undecimated discrete wavelet transform (Shensa, 1992), also known as the maximal overlap discrete wavelet transform (MODWT) (Percival and Guttorp, 1994; Percival and Mofjeld, 1996), or stationary discrete wavelet transform (Nason and Silverman, 1995). The MODWT carries out the same filtering steps as the ordinary DWT, but does not subsample (decimate by 2) the output and as a consequence, the MODWT is invariant to circular shifting of the time series. Furthermore, whereas, because of the subsampling, the ordinary DWT is readily applicable only to sample sizes that are powers of 2, the MODWT can be conveniently applied to any arbitrary length sample, a fact that appears to have first been pointed out in Percival and Guttorp (1994, p. 330). To understand why these properties are just what is required, we need first to look at the nature of the data to be analyzed. The time series of interest is that of subtidal sea levels for Crescent City, California (see e.g., Percival and Mofjeld, 1996). A permanent tide gauge has been maintained by the National Ocean Service (NOS). The gauge measures water levels every 6 minutes within a stilling well, which suppresses high-frequency fluctuations due to wind waves and swell. The time series used in this paper is the 1985 to 1989 segment of the water level series. The series was subsampled every tenth value to produce hourly values and low-pass filtered to remove the diurnal and semidiurnal tides. Finally the filtered series was resampled every 1=2 day, yielding a Nyquist frequency of one cycle per day. Hence each year of ..