scholarly journals The dynamic state index with moisture and phase changes

2021 ◽  
Vol 62 (12) ◽  
pp. 123101
Author(s):  
Sabine Hittmeir ◽  
Rupert Klein ◽  
Annette Müller ◽  
Peter Névir
Keyword(s):  
Phase Changes ◽  
Dynamic State ◽  
State Index

scholarly journals Evaluation of Anesthetic Specific EEG Dynamics during State Transitions between Loss and Return of Responsiveness

2021 ◽  
Vol 12 (1) ◽  
pp. 37
Author(s):  
Matthias Kreuzer ◽  
Tobias Kiel ◽  
Leonie Ernst ◽  
Marlene Lipp ◽  
Gerhard Schneider ◽  
...  
Keyword(s):  
General Anesthesia ◽  
Dynamic State ◽  
Permutation Entropy ◽  
State Transitions ◽  
Emergence Period ◽  
Emergence Patterns ◽  
Processed Eeg ◽  
Inhalational Anesthetic ◽  
Cortical Depression ◽  
State Index

Purpose: electroencephalographic (EEG) information is used to monitor the level of cortical depression of a patient undergoing surgical intervention under general anesthesia. The dynamic state transitions into and out of anesthetic-induced loss and return of responsiveness (LOR, ROR) present a possibility to evaluate the dynamics of the EEG induced by different substances. We evaluated changes in the EEG power spectrum during anesthesia emergence for three different anesthetic regimens. We also assessed the possible impact of these changes on processed EEG parameters such as the permutation entropy (PeEn) and the cerebral state index (CSI). Methods: we analyzed the EEG from 45 patients, equally assigned to three groups. All patients were induced with propofol and the groups differed by the maintenance anesthetic regimen, i.e., sevoflurane, isoflurane, or propofol. We evaluated the EEG and parameter dynamics during LOR and ROR. For the emergence period, we focused on possible differences in the EEG dynamics in the different groups. Results: depending on the substance, the EEG emergence patterns showed significant differences that led to a substance-specific early activation of higher frequencies as indicated by the “wake” CSI values that occurred minutes before ROR in the inhalational anesthetic groups. Conclusion: our results highlight substance-specific differences in the emergence from anesthesia that can influence the EEG-based monitoring that probably have to be considered in order to improve neuromonitoring during general anesthesia.

The data assimilation method “Latent Heat Nudging” assessed with the Dynamic State Index

2011 ◽  
Vol 20 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Antje Claussnitzer ◽  
Thomas Schartner ◽  
Peter Névir ◽  
Klaus Stephan ◽  
Ulrich Cubasch
Keyword(s):  
Data Assimilation ◽  
Latent Heat ◽  
Dynamic State ◽  
State Index

Scale Dependent Analytical Investigation of the Dynamic State Index Concerning the Quasi-Geostrophic Theory

2018 ◽  
Vol 4 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Annette Müller ◽  
Peter Névir ◽  
Rupert Klein
Keyword(s):  
Analytical Investigation ◽  
Reanalysis Data ◽  
Dynamic State ◽  
Small Scale ◽  
Synoptic Scale ◽  
Flow Equations ◽  
State Index ◽  
Precipitation Modeling ◽  
Original Index

Abstract The Dynamic State Index (DSI) is a scalar diagnostic field that quantifies local deviations from a steady and adiabatic wind solution and thus indicates non-stationarity aswell as diabaticity. The DSI-concept has originally been developed through the Energy-Vorticity Theory based on the full compressible flow equations without regard to the characteristic scale-dependence of many atmospheric processes. But such scaledependent information is often of importance, and particularly so in the context of precipitation modeling: Small scale convective events are often organized in storms, clusters up to “Großwetterlagen” on the synoptic scale. Therefore, a DSI index for the quasi-geostrophic model is developed using (i) the Energy-Vorticity Theory and (ii) showing that it is asymptotically consistent with the original index for the primitive equations. In the last part, using meteorological reanalysis data it is demonstrated on a case study that both indices capture systematically different scale-dependent precipitation information. A spin-off of the asymptotic analysis is a novel non-equilibrium time scale combining potential vorticity and the DSI indices.

Analysis of quantitative precipitation forecasts using the Dynamic State Index

2009 ◽  
Vol 94 (4) ◽  
pp. 694-703 ◽  
Author(s):  
A. Claußnitzer ◽  
P. Névir
Keyword(s):  
Dynamic State ◽  
Quantitative Precipitation Forecasts ◽  
State Index

Scale-dependent analyses of precipitation forecasts and cloud properties using the Dynamic State Index

2008 ◽  
Vol 17 (6) ◽  
pp. 813-825 ◽  
Author(s):  
Antje Névir Claussnitzer ◽  
Ines Langer ◽  
Eberhard Reimer ◽  
Ulrich Cubasch
Keyword(s):  
Dynamic State ◽  
Cloud Properties ◽  
State Index

scholarly journals Using the concept of the Dynamic State Index for a scale-dependent analysis of atmospheric blocking

2019 ◽  
Vol 28 (6) ◽  
pp. 487-498 ◽  
Author(s):  
Annette Müller ◽  
Peter Névir
Keyword(s):  
Dynamic State ◽  
Atmospheric Blocking ◽  
State Index

scholarly journals Process-oriented statistical-dynamical evaluation of LM precipitation forecasts

2008 ◽  
Vol 16 ◽  
pp. 33-41 ◽  
Author(s):  
A. Claußnitzer ◽  
I. Langer ◽  
P. Névir ◽  
E. Reimer ◽  
U. Cubasch
Keyword(s):  
Statistical Analysis ◽  
Flow Field ◽  
Relative Distance ◽  
Dynamic State ◽  
Primitive Equations ◽  
Threshold Parameter ◽  
Atmospheric Flow ◽  
Cloud Parameters ◽  
State Index

Abstract. The objective of this study is the scale dependent evaluation of precipitation forecasts of the Lokal-Modell (LM) from the German Weather Service in relation to dynamical and cloud parameters. For this purpose the newly designed Dynamic State Index (DSI) is correlated with clouds and precipitation. The DSI quantitatively describes the deviation and relative distance from a stationary and adiabatic solution of the primitive equations. A case study and statistical analysis of clouds and precipitation demonstrates the availability of the DSI as a dynamical threshold parameter. This confirms the importance of imbalances of the atmospheric flow field, which dynamically induce the generation of rainfall.

Pinocytotic-Like Forms of Mitochondria From Rat Anterior Pituitary

1968 ◽  
Vol 26 ◽  
pp. 146-147
Author(s):  
Burton B. Silver
Keyword(s):  
Electron Micrographs ◽  
Conformational Changes ◽  
Anterior Pituitary ◽  
Dynamic State ◽  
Surrounding Cell ◽  
The Matrix ◽  
The Moment ◽  
Cell Medium ◽  
Sectioned Tissue ◽  
State Of Activity

Sectioned tissue rarely indicates evidence of what is probably a highly dynamic state of activity in mitochondria which have been reported to undergo a variety of movements such as streaming, divisions and coalescence. Recently, mitochondria from the rat anterior pituitary have been fixed in a variety of configurations which suggest that conformational changes were occurring at the moment of fixation. Pinocytotic-like vacuoles which may be taking in or expelling materials from the surrounding cell medium, appear to be forming in some of the mitochondria. In some cases, pores extend into the matrix of the mitochondria. In other forms, the remains of what seems to be pinched off vacuoles are evident in the mitochondrial interior. Dense materials, resembling secretory droplets, appear at the junction of the pores and the cytoplasm. The droplets are similar to the secretory materials commonly identified in electron micrographs of the anterior pituitary.

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