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Your search keyword '"S. Pielsticker"' showing total 3 results
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3 results on '"S. Pielsticker"'

1. COMPARISON OF DIFFERENT DIAGNOSTIC TECHNIQUES FOR THE ASSESSMENT OF COAL PYROLYSIS RATE

Author

S. Krusch, V. Scherer, R. Solimene, G. Ruoppolo, F. Cerciello, S. Pielsticker, R. Kneer, K. Schlögel, and O. Senneca

Subjects
coal, fluidized bed combustion, kinetic, pyrolysis
Abstract

Simulation of fluidized bed combustion by commercial tools such as Barracuda or other CFD codes requires suitable kinetic models. Notably in fluidized bed reactors pyrolysis takes place with high heating rate in the temperature range of 800-900 °C and with coarse particle sizes (up to 10 mm). Therefore, intrinsic kinetics must be combined with modeling of heat and mass transfer. Intrinsic kinetics can be obtained by conventional TGA analysis at low heating rate (2-20 K/min) and with small particle size (in the order of 100 ?m). Recently a fluidized bed reactor purposely designed for operation with small particle size in combination with FTIR gas analysis has been used in Aachen to measure pyrolysis kinetics with high particle heating rate compatible with fluidized bed conditions [1]. Another innovative method to assess the rates of pyrolysis under fluidized bed conditions has been proposed by Solimene [2] in Naples and relies on the measurement of time resolved pressure. In the present work these different methodologies have been used for a German bituminous coal "Auguste Victoria" to obtain pyrolysis behavior over a broad range of operating conditions. Results show that for the two fluidized bed test rigs, using larger particle sizes, transport limitations become important. As expected, for this regime the reactions rates become lower the larger the particle size.

Published
2018

3. Identifying Patient Door-to-Room Goals to Minimize Left-Without-Being-Seen Rates.

Author

Pielsticker S, Whelan L, Arthur AO, and Thomas S

Subjects
Efficiency, Organizational statistics & numerical data, Emergency Service, Hospital organization & administration, Humans, Length of Stay statistics & numerical data, Retrospective Studies, Time Factors, Emergency Service, Hospital standards, Organizational Objectives
Abstract

Introduction: Emergency department (ED) patients in the leave-without-being-seen (LWBS) group risk problems of inefficiency, medical risk, and financial loss. The goal at our hospital is to limit LWBS to <1%. This study's goal was to assess the influence on LWBS associated with prolonging intervals between patient presentation and placement in an exam room (DoorRoom time). This study's major aim was to identify DoorRoom cutoffs that maximize likelihood of meeting the LWBS goal (i.e. <1%)., Methods: We conducted the study over one year (8/13-8/14) using operations data for an ED with annual census~50,000. For each study day, the LWBS endpoint (i.e. was LWBS<1%: "yes or no") and the mean DoorRoom time were recorded. We categorized DoorRoom means by intervals starting with ≤10min and ending at >60 min. Multivariate logistic regression was used to assess for DoorRoom cutoffs predicting high LWBS, while adjusting for patient acuity (triage scores and admission %) and operations parameters. We used predictive marginal probability to assess utility of the regression-generated cutoffs. We defined statistical significance at p<0.05 and report odds ratio (OR) and 95% confidence intervals (CI)., Results: Univariate results suggested a primary DoorRoom cutoff of 20', to maintain a high likelihood (>85%) of meeting the LWBS goal. A secondary DoorRoom cutoff was indicated at 35', to prevent a precipitous drop-off in likelihood of meeting the LWBS goal, from 61.1% at 35' to 34.4% at 40'. Predictive marginal analysis using multivariate techniques to control for operational and patient-acuity factors confirmed the 20' and 35' cutoffs as significant (p<0.001). Days with DoorRoom between 21-35' were 74% less likely to meet the LWBS goal than days with DoorRoom≤20' (OR 0.26, 95% CI [0.13-0.53]). Days with DoorRoom>35' were a further 75% less likely to meet the LWBS goal than days with DoorRoom of 21-35' (OR 0.25, 95% CI [0.15-0.41])., Conclusion: Operationally useful DoorRoom cutoffs can be identified, which allow for rational establishment of performance goals for the ED attempting to minimize LWBS.

Published
2015
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