Briggsvilhelmsen5085

Thanks to the advantages of structure and composition, the HCS@Co/NC catalyst exhibits a superb performance of oxygen reduction reaction, which outperforms the commercial Pt/C benchmark.During superficial radiotherapy, and for cases where bony structures lie relatively close to the surface behind the tissue region being treated, perturbations to delivered dose are expected due to the change in tissue scattering conditions and the value of buildup factor near the tissue/bone interface. The absorbed dose distribution within bone, muscle, and muscle-bone-muscle interfaces was estimated for photons within the energy range 0.05 to 1.333 MeV. The energy absorption buildup factor is computed using the (GP) fitting method for a geometry of adjacent layers within a multilayer tissue matrix where a thick slab of solid bone is located in-between slabs of muscles of the same thickness. It was observed that dose enhancement was limited only to a few millimeters close to the interface. Also, variations in dose at the interface were found significant only for low photon energies and relatively insignificant at photon energies higher than 0.06 MeV.

To assess the effect of slice thickness on the diagnostic accuracy of erosion detection at MR T1-weighted images (T1WI) of the sacroiliac joints (SIJ) in adult patients suspected of sacroiliitis.

Patients aged 18-60 years with clinical suspicion of sacroiliitis were enrolled. All patients underwent CT and 3 T MRI of the SIJs on the same day. CT at 1 mm slice thickness, semi-coronal spin echo T1WI sequences with four different slice thicknesses (2, 3, 4 and 5 mm) were obtained. For scoring erosions, each SIJ was divided into four quadrants. Presence or absence of erosions was scored on T1WI sequences by two independent readers blinded to other data. Inter-reader agreement was assessed using κ statistics. Diagnostic accuracy of MRI for erosions at each slice thickness was evaluated vs. consensus CT as reference standard, using area under the receiver operating characteristic curve (AUC).

Fifty-three patients (23 men, 30 women, mean age, 39.0 years ± 10.2) were included. Inter-reader agreement for erosion score on all T1WI sequences was moderate (κ value 0.54 to 0.60). With increasing slice thickness, both the recorded total number of erosions and sensitivity for erosion vs. CT decreased. The AUC were significantly higher for 2 mm and 3 mm T1WI than for 4 mm and 5 mm T1WI.

The diagnostic accuracy of T1WI for erosion detection vs. a CT reference standard is affected by slice thickness. Thinner slices (2 or 3 mm) had significantly higher diagnostic accuracy than thicker slices (4 or 5 mm).

The diagnostic accuracy of T1WI for erosion detection vs. a CT reference standard is affected by slice thickness. Thinner slices (2 or 3 mm) had significantly higher diagnostic accuracy than thicker slices (4 or 5 mm).

To assess the inter-reader variability in response assessment for HCC treated with radioembolization (TARE) compared with 3D quantitative criteria (qEASL); and to evaluate their role in prediction of pathological necrosis and clinical outcomes.

57 patients with 77 HCCs who underwent TARE were included. Five radiologists recorded multiple imaging features and assigned mRECIST/LIRADS Treatment Response (TR) categories on post-treatment MRI at 4-6 weeks and 6-9 months after TARE. qEASL categories were assigned by a separate reader. Inter-reader variability between LIRADS TR/mRECIST/qEASL were evaluated and hazards regression was used in predicting clinical outcomes.

Inter-reader agreement was fair for mRECIST (K = 0.43 and 0.34 at first and second follow-up respectively); moderate for LIRADS TR (K = 0.48 and 0.53 at first and second follow-up respectively). Inter-criterion agreement was moderate to substantial (r = 0.41-0.65 and r = 0.54-0.60 at first and second follow-up) for mRECIST-qEASL. LIRADS TR corr for mRECIST, and moderate inter-reader agreement for LIRADS TR response assessment criteria. qEASL outperformed mRECIST criteria for early identification of responders and predicting TFS, suggesting an advantage in volumetric tumor response assessment. LIRADS TR outperformed other criteria in predicting pathological necrosis.The spatiotemporal attenuation of Cd and Zn concentrations was assessed in sediments from Sepetiba Bay, which is a coastal system that has been historically impacted by industrial wastes. The evolution of contamination over the years shortly before and after cessation of electroplating industry activities, by the end of 1990's, was elucidated by reviewing the existing datasets for the whole bay area. Metal concentrations exceed Brazilian Sediment Quality Guidelines in most regions, corresponding to concentrations 3 to 4 orders of magnitude higher than background levels and Enrichment Factors reaching values significantly higher than 40 for both elements. In the second decade after electroplating industry closure, the levels of Cd and Zn lowered in most regions of the bay. However, an increase in the relative importance of diffuse sources can mislead the current and future identification of Cd and Zn input, bringing new challenges for environmental monitoring and management for Sepetiba bay.As part of the Deepwater Horizon Oil Spill Natural Resource Damage Assessment in the Gulf of Mexico, we conducted a large passive acoustic survey across the eastern Gulf continental shelf edge to assess impacts to sperm whale population. In the months immediately after the spill, sperm whale occurrence was significantly higher in areas closest to the spill. Over the following seasons in 2010-2011, we documented cyclical patterns of decreased and increased occurrence suggesting that this population exhibits a seasonal occurrence pattern in the region, with seasonal movements to other regions, and not likely directly influenced by the oil spill. learn more Unfortunately, a lack of adequately scaled, pre-spill data on sperm whales, along with limitations on the survey duration constrain our ability to infer spill-related changes in sperm whale occurrence. However, our study establishes post-disaster baseline data for continued monitoring, and an expanded study design could provide a model for continued monitoring.