scholarly journals The Early Stages of Post-Collapse Cluster Evolution

1985 ◽  
Vol 113 ◽  
pp. 331-333
Author(s):  
Stephen L. W. McMillan
Keyword(s):  
Statistical Treatment ◽  
Core Collapse ◽  
Identical Point ◽  
Early Stages ◽  
Cluster Evolution ◽  
Large N ◽  
Small N

We present here some recent (and very preliminary) findings from a study of the early stages of the post-core-collapse evolution of an isolated cluster of identical point “stars”. The method used to follow the behavior of the system is the unified N-body/statistical treatment described in detail by McMillan and Lightman (1984a) and by Lightman and McMillan elsewhere in this volume. Briefly, the method combines the standard “large-N” and “small-N” approaches to the problem in the régimes where they are appropriate by treating the inner regions (r < rN) exactly with a regularized Aarseth N-body code (Aarseth, 1972), while permitting stars at greater and greater radii to retain less and less of their individual identities, ultimately treating the outer portions of the system (r > KrN) in an almost purely statistical fashion.

Using Item-level Analyses to Better Understand the Consequences of Partialing Procedures: An Example Using the Dark Triad

2019 ◽  
Author(s):  
Colin Vize ◽  
Katherine Collison ◽  
Donald Lynam ◽  
Josh Miller
Keyword(s):  
Psychological Research ◽  
Dark Triad ◽  
Small Samples ◽  
Residual Content ◽  
Fine Grained ◽  
Large N ◽  
Dirty Dozen ◽  
Item Level ◽  
Variable Content ◽  
Small N

Objective: Partialing procedures are frequently used in psychological research. The present study sought to further explore the consequences of partialing, focusing on the replicability of partialing-based results. Method: We used popular measures of the Dark Triad (DT; Machiavellianism, narcissism, and psychopathy) to explore the replicability of partialing procedures. We examined whether the residual content of popular DT scales are similar to the residual content of DT scales derived from separate samples based on relations with individual items from the IPIP-NEO-120, allowing for a fine-grained analysis of residual variable content. Results: Profiles were compared using three sample sizes (Small N=156-157, Moderate N = 313-314, Large N = 627-628) randomly drawn from a large MTurk sample (N = 1,255). There was low convergence among original/residual DT scales within samples. Additionally, results showed the content of residual Dirty Dozen scales was not similar across samples. Similar results were found for Short Dark Triad-Machiavellianism, but only in the moderate and small samples. Conclusion: The results indicate that there are important issues that arise when using partialing procedures, including replicability issues surrounding residual variables. Reasons for the observed results are discussed and further research examining the replicability of residual-based results is recommended.

Studying Non-Democratic Regional Organizations: Methodological Issues

2019 ◽  
pp. 66-75
Author(s):  
Anastassia V. Obydenkova ◽  
Alexander Libman
Keyword(s):  
Mixed Methods ◽  
Mixed Methods Research ◽  
World Wide ◽  
Research Question ◽  
Theoretical Concept ◽  
Research Strategy ◽  
Regional Organizations ◽  
Large N ◽  
The World ◽  
Small N

The chapter describes the methodology of this book’s analysis. In particular, it presents details on our mixed methods research strategy and how the insights from the small-N studies contribute to the large-N research. In particular, it describes the benefits of using a concurrent instead of a sequential research design for our research question; it shows how we integrate the findings from the world-wide (large-N) analysis with the analysis of three regional organizations in post-Soviet Eurasia (combining large-N and small-N approaches). It also shows how the theoretical concept of non-democratic regional organizations can be operationalized empirically and presents details on the data that are used.

Anatomical Basis of Liver Hanging Maneuver: A Clinical and Anatomical in Vivo Study

2007 ◽  
Vol 73 (11) ◽  
pp. 1193-1196 ◽  
Author(s):  
Giuseppe Maria Ettorre ◽  
Richard Douard ◽  
Valerio Corazza ◽  
Roberto Santoro ◽  
Giovanni Vennarecci ◽  
...  
Keyword(s):  
Vena Cava ◽  
Small Diameter ◽  
Hepatic Veins ◽  
Minor Bleeding ◽  
Complication Rates ◽  
Liver Hanging Maneuver ◽  
Anatomical Basis ◽  
Hanging Maneuver ◽  
Large N ◽  
Small N

Liver Hanging Maneuver (LHM) provides better exposure of the deeper section plane together with Inferior Vena Cava (IVC) protection during right hepatectomies without primary liver mobilization. This study assessed the feasibility and complication rates of LHM focusing on the anatomical distribution of the accessory hepatic veins in the retrohepatic portion of the IVC. From January 2002 to December 2005, LHM was planned in 49 consecutive major hepatectomies. The IVC retrohepatic portion was studied during the anhepatic phase in 17 liver transplantations with IVC preservation. The diameter and location of the vein openings were recorded after IVC division into nine portions. LHM was achieved in 47/49 patients (96%). Bleeding occurred in only one patient (2%) and did not entail procedure interruption. The anatomical study revealed a total of 86 veins present in 17 cases (5.18 ± 4 per patient) and classified them according to diameter (<3, 3 to 6, and >6 mm), as small (n = 40), medium (n = 29), and large (n = 17), respectively. Nine openings were found in the avascular channel for 6/17 (35%) patients (small n = 6, medium n = 3, large n = 0). LHM is a highly feasible procedure with minor bleeding risks due to the lower density and small diameter of short hepatic veins and caudate veins present in the avascular channel.

scholarly journals Two paths of cluster evolution: global expansion versus core collapse

2014 ◽  
Vol 444 (1) ◽  
pp. 80-92 ◽  
Author(s):  
Ryan M. O'Leary ◽  
Steven W. Stahler ◽  
Chung-Pei Ma
Keyword(s):  
Core Collapse ◽  
Global Expansion ◽  
Cluster Evolution

scholarly journals After Core Collapse. What?

1988 ◽  
Vol 126 ◽  
pp. 379-392
Author(s):  
Haldan Cohn
Keyword(s):  
Computer Simulations ◽  
Globular Cluster ◽  
Large Amplitude ◽  
Globular Clusters ◽  
Dynamical Evolution ◽  
Core Collapse ◽  
Expansion Phase ◽  
Cluster Evolution ◽  
Detailed Computer ◽  
The Stability

As our understanding of core collapse in globular clusters has improved through detailed computer simulations, attention has naturally turned to dynamical evolution of globular clusters after core collapse. The results of recent simulations of post-collapse cluster evolution are reviewed. An assessment is given of progress towards the goal of developing astrophysically realistic models that cover all phases of globular cluster evolution. A focus of this review is the stability of the post-collapse expansion phase to the large amplitude core oscillations first observed in the simulations of Sugimoto and Bettwieser and now confirmed by several other studies. The implications of core oscillations for the observation of post-collapse clusters are discussed.

Cluster evolution during the early stages of heating explosives and its relationship to sensitivity: a comparative study of TATB, β-HMX and PETN by molecular reactive force field simulations

2015 ◽  
Vol 17 (18) ◽  
pp. 12013-12022 ◽  
Author(s):  
Yushi Wen ◽  
Chaoyang Zhang ◽  
Xianggui Xue ◽  
Xinping Long
Keyword(s):  
Comparative Study ◽  
Force Field ◽  
Oxygen Balance ◽  
Reactive Force ◽  
Reactive Force Field ◽  
Early Stages ◽  
Cluster Evolution

The clustering mechanism of heating TATB, HMX and PETN was strongly influenced by their oxygen balance and was related to their sensitivity.

Lateral patellar luxation in dogs: a retrospective study of 65 dogs

2014 ◽  
Vol 27 (02) ◽  
pp. 130-134 ◽  
Author(s):  
S. J. Butterworth ◽  
A. Miller ◽  
B. Keeley ◽  
S. Baines ◽  
W. M. McKee ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Clinical Features ◽  
Revision Surgery ◽  
Medical Records ◽  
Genu Valgum ◽  
Implant Removal ◽  
Large N ◽  
Younger Age ◽  
Small N ◽  
Multicentre Retrospective Study

SummaryTo report the signalment and clinical features of dogs with non-traumatic lateral patellar luxation and to report the complications and outcomes following surgery.A multicentre retrospective study was performed. Medical records were reviewed and the signalment, clinical features, and treatment of dogs presenting with lateral patellar luxation were recorded. In dogs treated surgically, the outcome and complications were investigated.Sixty-five dogs (95 stifles) were included; 39 were male and median age at presentation was 10 months. Breeds were classified as small (n = 6), medium (n = 23), large (n = 27), and giant (n = 9). Lateral patellar luxation was classified as grade I (n = 14), II (n = 41), III (n = 29), and IV (n = 11). Conformational abnormalities were noted in 34 stifles; genu valgum was the most common (n = 28). Higher-grade luxation was associated with a younger age at presentation (p = 0.032) and genu valgum (p = 0.01). Surgery was performed on 58 stifles, 22 of which sustained one or more complications; 16 complications were managed conservatively, four with implant removal and six with revision surgery. Surgeon-assessed outcome was good or excellent in 47 of the 51 dogs available for review.Non-traumatic lateral patellar luxation is a disease of predominantly medium and large breed dogs. It has several similar clinical features and can be surgically treated in a similar manner to medial patellar luxation with similar types of complications and outcomes expected.

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