scholarly journals What About Interaction Geography to Evaluate Physical Learning Spaces?

2020 ◽  
pp. 167-179
Author(s):  
Ben Rydal Shapiro
Keyword(s):  
Modal Analysis ◽  
Learning Spaces ◽  
Dynamic Information ◽  
New Approach ◽  
Information Visualisation ◽  
Space And Time ◽  
Visualisation Tool

AbstractThis paper reviews and explores how interaction geography, a new approach to visualize people’s interaction over space and time, extends current approaches to evaluate physical learning spaces. This chapter begins by reviewing representations produced using interaction geography to study visitor engagement and learning in a museum. In particular, this review illustrates Mondrian Transcription, a method to map people’s movement and conversation over space and time, and the Interaction Geography Slicer (IGS), a dynamic visualisation tool that supports new forms of interaction and multi-modal analysis. Subsequently, this chapter explores how interaction geography may advance the evaluation of physical learning spaces by providing dynamic information visualisation methods that support more expansive views of learning and the evaluation of the alignment between space and pedagogy. This chapter concludes by outlining significant limitations and next steps to expand interaction geography to evaluate physical learning spaces.

System Identification of Mistuned Bladed Disks From Traveling Wave Response Measurements

2003 ◽  
Author(s):  
D. M. Feiner ◽  
J. H. Griffin ◽  
K. W. Jones ◽  
J. A. Kenyon ◽  
O. Mehmed ◽  
...  
Keyword(s):  
System Identification ◽  
Modal Analysis ◽  
Traveling Wave ◽  
Natural Frequencies ◽  
Wave Excitation ◽  
New Approach ◽  
Operational Conditions ◽  
System Identification Method ◽  
Bladed Disk ◽  
Identification Method

A new approach to modal analysis is presented that allows the modes and natural frequencies of a mistuned bladed disk to be determined from its response to a traveling wave excitation. The resulting modes and natural frequencies are then used as input to a system identification method to determine the bladed disk’s mistuning while it is rotating. This capability is useful since it provides a basis for determining blade frequencies under engine operational conditions and could help monitor the health of the engine.

scholarly journals Near wall dynamics of a spherical particle in crowded suspensions of colloidal rods – dynamic information from TIRM revisited

Soft Matter ◽  
2018 ◽  
Vol 14 (45) ◽  
pp. 9232-9242 ◽  
Author(s):  
Silvia De Sio ◽  
Christoph July ◽  
Jan K. G. Dhont ◽  
Peter R. Lang
Keyword(s):  
Spherical Particle ◽  
Total Internal Reflection ◽  
Flat Glass ◽  
Internal Reflection ◽  
Dynamic Information ◽  
Glass Wall ◽  
New Approach ◽  
Spatially Resolved ◽  
Total Internal Reflection Microscopy ◽  
Near Wall

We performed total internal reflection microscopy (TIRM) experiments to determine the depletion potentials between probe spheres and a flat glass wall, induced by rod-shaped colloids (fd-virus), and we suggest a new approach to study the spatially resolved dynamics of the probe spheres.

scholarly journals Description of processes passing at finite space and time intervals in the framework of QFT

2019 ◽  
Vol 222 ◽  
pp. 01009
Author(s):  
Vadim Egorov ◽  
Igor Volobuev
Keyword(s):  
Plane Waves ◽  
Neutral Kaon ◽  
Pion Decay ◽  
Momentum Representation ◽  
Time Intervals ◽  
Final Particle ◽  
New Approach ◽  
Space And Time ◽  
Feynman Rules ◽  
Finite Space

We consider a new approach to the description in the framework of QFT of processes passing at finite space and time intervals. The formalism is based on the Feynman diagram technique in the coordinate representation, in which the rules of passing to the momentum representation are modified in accordance with the experimental setup of neutrino oscillation experiments. In effect, only the propagators of particles in the momentum representation are modified, while all the other standard Feynman rules in the momentum representation remain the same. Since the initial and final particle states are described by plane waves, the approach does not need the use of wave packets, which greatly simplifies the calculations of amplitudes. Taking as examples the processes of displaced pion decay, neutral kaon and neutrino oscillations we show that the approach under consideration correctly reproduces the known standard results.

scholarly journals Input-output pairing criterion applied in the genetic algorithm for unstable linear systems

2016 ◽  
Vol 64 (4) ◽  
pp. 873-876
Author(s):  
P.Q. Baban ◽  
I.N. Rahimabadi
Keyword(s):  
Genetic Algorithm ◽  
Closed Loop ◽  
Necessary Conditions ◽  
Previous Method ◽  
Input Output ◽  
Unstable System ◽  
Dynamic Information ◽  
Error Matrix ◽  
New Approach ◽  
Measuring Interaction

Abstract In this paper, a new approach towards input-output pairing for an unstable system has been proposed. First, it is demonstrated that the previous method of input-output pairing for unstable plants cannot find appropriate pairs as it only checks necessary conditions for stability and integrity. Then, a new approach using relative error matrix and genetic algorithm for finding appropriate pairs in unstable systems is proposed. As it is shown, this approach takes into consideration both static and dynamic information of plant in measuring interaction. Finally, the accuracy of proposed method is demonstrated by an example and closed loop simulation.

scholarly journals Transmissibility-Based Operational Modal Analysis: Enhanced Stabilisation Diagrams

2012 ◽  
Vol 19 (5) ◽  
pp. 1085-1097 ◽  
Author(s):  
Gert De Sitter ◽  
Christof Devriendt ◽  
Patrick Guillaume
Keyword(s):  
Modal Analysis ◽  
Power Spectra ◽  
Element Model ◽  
Operational Modal Analysis ◽  
Second Step ◽  
New Approach ◽  
Analysis Techniques ◽  
Estimated Parameters ◽  
Using Data ◽  
Acoustical Data

Recently it has been shown that also transmissibilities can be used to identify the modal parameters. This approach has several advantages: because of the deterministic character of the transmissibility functions, the estimated parameters are more accurate than the results obtained with the power spectra based operational modal analysis techniques. Another advantage is that the transmissibility functions do not depend on the colouring of the unknown forces. A disadvantage of the transmissibility based operational modal analysis techniques is that non-physical modes show up in the stabilisation diagrams. In this contribution it will first be shown that those non-physical modes will show up when traditional stabilisation diagrams are used. In a second step, a new approach of selecting the physical modes out of a set of estimated modes will be discussed and the new approach will be validated using data generated with an acoustical Finite Element Model. Finally, the approach will be validated using real acoustical data.

scholarly journals Critical scales to explain urban hydrological response

2018 ◽  
Author(s):  
Elena Cristiano ◽  
Marie-Claire ten Veldhuis ◽  
Santiago Gaitan ◽  
Susana Ochoa Rodriguez ◽  
Nick van de Giesen
Keyword(s):  
Urban Areas ◽  
Rainfall Variability ◽  
Model Complexity ◽  
Hydrological Response ◽  
Catchment Scale ◽  
Scaling Factors ◽  
Rainfall Events ◽  
New Approach ◽  
Space And Time ◽  
X Band

Abstract. Rainfall variability in space and time, in relation to catchment characteristics and model complexity, plays an important role in explaining the sensitivity of hydrological response in urban areas. In this work we present a new approach to classify rainfall variability in space and time and we use this classification to investigate rainfall aggregation effects on urban hydrological response. Nine rainfall events, measured with a Dual polarimetric X-Band radar at the CAESAR Site (Cabauw Experimental Site for Atmospheric Research, NL), were aggregated in time and space in order to obtain different resolution combinations. The aim of this work was to investigate the influence that rainfall and catchment scales have on hydrological response in urban areas. Three dimensionless scaling factors were introduced to investigate the interactions between rainfall and catchment scale and rainfall input resolution in relation to the performance of the model. Results showed that (1) rainfall classification based on cluster identification well represents the storm core, (2) aggregation effects are stronger for rainfall than flow, (3) model complexity does not have a strong influence compared to catchment and rainfall scales for this study case, (4) scaling factors allow to select the adequate rainfall resolution to obtain a given level of accuracy in the calculation of hydrological response.

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