scholarly journals Advanced Supersonic Parachute Inflation Research Experiment Preflight Trajectory Modeling and Postflight Reconstruction

2020 ◽  
Vol 57 (6) ◽  
pp. 1387-1407 ◽  
Author(s):  
Soumyo Dutta ◽  
Christopher D. Karlgaard ◽  
Jake A. Tynis ◽  
Clara O’Farrell ◽  
Bryan S. Sonneveldt ◽  
...  
Keyword(s):  
Trajectory Modeling ◽  
Parachute Inflation ◽  
Research Experiment

PENGARUH PENDEKATAN APTITUDE TREATMENT INTERACTION (ATI) TERHADAP PEMAHAMAN KONSEP MATEMATIKA SISWA KELAS VIII SMP NEGERI 25 PEKANBARU

2015 ◽  
Vol 4 (1) ◽  
pp. 79
Author(s):  
Herlina '
Keyword(s):  
Control Group ◽  
Treatment Interaction ◽  
Aptitude Treatment Interaction ◽  
Research Experiment ◽  
And Control

This research intent to see how big influence of approaching aptitude treatment interaction (ATI) to mathematics concept grasp student brazes VIII SMP Country 25 Pekanbaru. This research constitute my research experiment attention. Subjec in observational it is student braze VIII4 as agglomerate as experiment by totals student 40 person and VIII3'S classes as agglomerate as controls by totals students 40. Base analisis data to pretes's score to know student startup ability on agglomerate experiment and control group. On student experiment group that will study by ATI'S approaching has average early learned result mathematics (pretes) as big as 17,15. Meanwhile on group controls student who will study by ordinary learning (conventional) have average early learned result mathematics (pretes) as big as 13,85. Analisis is data to postes's score on agglomerate learned student experiment with ATI'S approaching has average final learned result mathematics (postes) as big as 74,63. Meanwhile on group controls learned student with ordinary learning (conventional) have average final learned result mathematics (postes) as big as 62,93. Of quiz result distinctive both of average usufruct to study mathematics finals (postes) that points out that there is difference which signifikan among both of experiment class with control class.Keywords: aptitude treatment interaction (ATI), mathematics concept

Profiling Darkweb Child Sexual Exploitation Material Forum Members Using Longitudinal Posting History Data

2021 ◽  
pp. 089443932199489
Author(s):  
Madeleine van der Bruggen ◽  
Arjan Blokland
Keyword(s):  
Law Enforcement ◽  
English Language ◽  
Sexual Exploitation ◽  
Communication Patterns ◽  
Developmental Pathways ◽  
Activity Levels ◽  
History Data ◽  
Trajectory Modeling ◽  
Child Sexual Exploitation ◽  
Observation Period

Darkweb fora dedicated to the illegal exchange of child sexual exploitation material (CSEM) continue to thrive. Profiling forum members based on their communication patterns will increase our insights in the dynamics of online CSEM and may aid law enforcement to identify those members who are most influential and pose the highest risk. The current study uses data from a large English language Darkweb CSEM forum that was active between 2010 and 2014, containing over 400,000 posts. Posts were time stamped, categorized based on subforum topic, and linked to individual forum members by nickname. Group-based trajectory modeling was subsequently applied to derive forum member profiles based on members’ posting history. Analyses show that over the course of the observation period, overall activity levels—in terms of total number of posting members and the average number of posts per month per member—fluctuate substantially and that multiple developmental pathways—in terms of monthly patterns in the frequency of posts by individual members—can be distinguished. Theoretical and practical ramifications of these findings are discussed.

Use of an Apex Drogue as a Means for Controlling Parachute Inflation

1980 ◽  
Vol 17 (5) ◽  
pp. 376-378
Author(s):  
Bryan W. Roberts
Keyword(s):  
Parachute Inflation

Mortality Following Trajectories of Mobility Limitations: The Modifying Impact of Social Factors

2018 ◽  
Vol 32 (3-4) ◽  
pp. 134-142
Author(s):  
Terese Sara Høj Jørgensen ◽  
Volkert Siersma ◽  
Rikke Lund ◽  
Charlotte Juul Nilsson
Keyword(s):  
Older Adults ◽  
Social Factors ◽  
Regression Models ◽  
Age Group ◽  
Mobility Limitations ◽  
Hazard Regression ◽  
Trajectory Modeling ◽  
High Level ◽  
Method Group

Objective: How are trajectories of mobility limitations (MLs) among older adults associated with mortality? Do social factors modify these associations? Method: Group-based trajectory modeling was used to identify four trajectories of MLs over a period of 4.5 years among 3,055 older Danes. Mortality analyses were conducted using additive hazard regression models. Results: Compared to older adults without MLs, older adults with high level of MLs who experienced further increase in MLs were associated with the most additional deaths followed by older adults with no MLs at baseline who later experienced limitations and older adults with a medium ML level at baseline who later experienced further increase in limitations. Men and 80-year olds experienced more additional deaths following adverse ML trajectories than women and 75-year olds. Discussion: Trajectories that led to higher ML levels were associated with most additional deaths especially among men and in the oldest age group.

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