Stuart Wildy

An Algorithm for Identifying a Crack Within a Measured Displacement Field

Publisher: Springer Science and Business Media LLC

Date: 20-04-2017

DOI: 10.1007/S10921-017-0406-8

Experimental evaluation of the use of embedded fiber Bragg gratings to measure steady and unsteady flow-induced marine propeller blade deformation

Publisher: Elsevier BV

Date: 08-2023

DOI: 10.1016/J.OCEANENG.2023.114889

Surface Strain Measurements Using a 3D Scanning Laser Vibrometer

Publisher: Springer Science and Business Media LLC

Date: 06-10-2011

DOI: 10.1007/S11340-011-9545-5

Concurrent validity and reliability of suicide risk assessment instruments: A meta-analysis of 20 instruments across 27 international cohorts.

Publisher: American Psychological Association (APA)

Date: 03-2023

DOI: 10.1037/NEU0000850

Detection of Delamination Damage in a Composite Laminate Beam Utilising the Principle of Strain Compatibility

Publisher: Trans Tech Publications, Ltd.

Date: 10-2009

DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.417-418.269

Abstract: This paper presents an experimental investigation of a new method for damage detection based on the most fundamental concept in continuum mechanics: strain compatibility. Compliance with this principle implies a deformed material is free from discontinuities, which are indicative of many types of structural damage. Therefore the principle of strain compatibility, in its ability to identify discontinuities, is very promising as a new foundation for future research into non-destructive evaluation and structural health monitoring technologies. The proposed method has many advantages compared to existing damage detection techniques, such as its invariance to material properties, type and intensity of loading, and the geometry of the structure. In this paper, a proposed formulation of the strain compatibility equation for beam structures, which is invariant to loading intensity, is presented. An experimental investigation of the proposed algorithm was conducted on a delaminated cantilever beam, utilising a PSV-3D scanning laser vibrometer. The experiment demonstrated that the strain compatibility technique can accurately locate delamination damage in composite beam structures.

Effect of Plate Thickness and Load History on Fatigue Crack Growth

Publisher: Trans Tech Publications, Ltd.

Date: 10-2009

DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.417-418.201

Abstract: A new theoretical approach is presented for investigating fatigue crack growth in plates of finite thickness. The developed approach utilizes a modified strip-yield analysis and the concept of plasticity-induced crack closure. A number of typical fatigue crack growth phenomena are investigated including the thickness effect on constant litude fatigue crack growth, retardation due to a tensile overload cycle, and short crack growth from sharp notches. Theoretical predictions are compared with experimental data and are found to be in very good correlation.

A new passive defect detection technique based on the principle of strain compatibility

Publisher: IOP Publishing

Date: 27-05-2008

DOI: 10.1088/0964-1726/17/4/045004

Reconstruction of baseline time-trace under changing environmental and operational conditions

Publisher: IOP Publishing

Date: 22-02-2016

DOI: 10.1088/0964-1726/25/3/035018

Assessing changes in global fire regimes

Publisher: Cold Spring Harbor Laboratory

Date: 08-02-2023

DOI: 10.1101/2023.02.07.527551

Abstract: Human activity has fundamentally altered wildfire on Earth, creating serious consequences for human health, global bio ersity, and climate change. However, it remains difficult to predict fire interactions with land use, management, and climate change, representing a serious knowledge gap and vulnerability. We used expert assessment to combine opinions about past and future fire regimes from 98 wildfire researchers. We asked for quantitative and qualitative assessments of the frequency, type, and implications of fire regime change from the beginning of the Holocene through the year 2300. Respondents indicated that direct human activity was already influencing wildfires locally since at least ~ 12,000 years BP, though natural climate variability remained the dominant driver of fire regime until around 5000 years BP. Responses showed a ten-fold increase in the rate of wildfire regime change during the last 250 years compared with the rest of the Holocene, corresponding first with the intensification and extensification of land use and later with anthropogenic climate change. Looking to the future, fire regimes were predicted to intensify, with increases in fire frequency, severity, and/or size in all biomes except grassland ecosystems. Fire regime showed quite different climate sensitivities across biomes, but the likelihood of fire regime change increased with higher greenhouse gas emission scenarios for all biomes. Bio ersity, carbon storage, and other ecosystem services were predicted to decrease for most biomes under higher emission scenarios. We present recommendations for adaptation and mitigation under emerging fire regimes, concluding that management options are seriously constrained under higher emission scenarios.

Investigation of Thermo-Mechanical Properties of Slurry Based Thermal Barrier Coatings under Repeated Thermal Shock

Publisher: Trans Tech Publications, Ltd.

Date: 10-2009

DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.417-418.197

Abstract: Thermal Barrier Coatings have existed for over 40 years, and with in the last 15 years their use in industrial applications has dramatically increased. Thermal Barrier Coatings (TBCs) are currently used in gas turbines, diesel engines, throughout aerospace and nuclear power industries. The purpose of TBC is to reduce temperature and thermal stresses, and, as a result, increase the reliability and life of load-bearing components subjected to high temperature or temperature flux. However, TBCs often fail under thermal cyclic loading with reliability still being the major issue impeding their wide-spread applications. The focus of this work is on experimental investigations of zirconia/nickel graded TBC system, subject to thermal shock loading. The graded TBC systems were fabricated utilising a recently developed slurry spray manufacturing technique. This is a robust technique, and is able to cover large and curved surfaces at low cost, and provides many advantages in comparison with its alternatives. This paper describes the developed technique and presents selected results of thermo-mechanical and fracture testing of the TBCs including graded coatings fabricated using this new technique.

Accuracy of Quasi-Static Bending Strain Measurement using Scanning Laser Doppler Vibrometry (SLDV)

Publisher: Springer Science and Business Media LLC

Date: 14-10-2016

DOI: 10.1007/S40799-016-0156-Z

Low-cost, open-source, collapsible, air-transportable, field-manufacturable telecommunications tower

Publisher: IEEE

Date: 10-2014

DOI: 10.1109/GHTC.2014.6970289

Structural brain alterations associated with suicidal thoughts and behaviors in young people: results from 21 international studies from the ENIGMA Suicidal Thoughts and Behaviours consortium.

Publisher: Springer Science and Business Media LLC

Date: 07-09-2022

DOI: 10.1038/S41380-022-01734-0

Abstract: Identifying brain alterations associated with suicidal thoughts and behaviors (STBs) in young people is critical to understanding their development and improving early intervention and prevention. The ENIGMA Suicidal Thoughts and Behaviours (ENIGMA-STB) consortium analyzed neuroimaging data harmonized across sites to examine brain morphology associated with STBs in youth. We performed analyses in three separate stages, in s les ranging from most to least homogeneous in terms of suicide assessment instrument and mental disorder. First, in a s le of 577 young people with mood disorders, in which STBs were assessed with the Columbia Suicide Severity Rating Scale (C-SSRS). Second, in a s le of young people with mood disorders, in which STB were assessed using different instruments, MRI metrics were compared among healthy controls without STBs (HC N = 519), clinical controls with a mood disorder but without STBs (CC N = 246) and young people with current suicidal ideation (N = 223). In separate analyses, MRI metrics were compared among HCs (N = 253), CCs (N = 217), and suicide attempters (N = 64). Third, in a larger transdiagnostic s le with various assessment instruments (HC = 606 CC = 419 Ideation = 289 HC = 253 CC = 432 Attempt=91). In the homogeneous C-SSRS s le, surface area of the frontal pole was lower in young people with mood disorders and a history of actual suicide attempts (N = 163) than those without a lifetime suicide attempt (N = 323 FDR-p = 0.035, Cohen's d = 0.34). No associations with suicidal ideation were found. When examining more heterogeneous s les, we did not observe significant associations. Lower frontal pole surface area may represent a vulnerability for a (non-interrupted and non-aborted) suicide attempt however, more research is needed to understand the nature of its relationship to suicide risk.

Risk Factors for Suicide Attempt During Outpatient Care in Adolescents With Severe and Complex Depression

Publisher: Hogrefe Publishing Group

Date: 05-2023

DOI: 10.1027/0227-5910/A000860

Abstract: Abstract. Background: Young people receiving tertiary mental health care are at elevated risk for suicidal behavior, and understanding which in iduals are at increased risk during care is important for treatment and suicide prevention. Aim: We aimed to retrospectively identify risk factors for attempted suicide during outpatient care and predict which young people did or did not attempt during care. Method: Penalized logistic regression analysis was performed in a small high-risk s le of 84 young people receiving care at Orygen’s Youth Mood Clinic (age: 14–25 years, 51% female) to predict suicide attempt during care (N = 16). Results: Prediction of suicide attempt during care was only moderately accurate (Area Under the Receiver Operating Curve range 0.71 sensitivity 0.57) using a combination of sociodemographic, psychosocial, and clinical variables. The features that best discriminated both groups included suicidal ideation during care, history of suicide attempt prior to care, changes in appetite reported on the PHQ-9, history of parental separation, and parental mental illness. Limitation: Replication of findings in an independent validation s le is needed. Conclusion: While prediction of suicide attempt during care was only moderately successful, we were able to identify in idual risk factors for suicidal behavior during care in a high-risk s le.

University Of Adelaide

Location: Australia

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Czech University Of Life Sciences Prague

Location: Czechia

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Flinders University

Location: Australia

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Université De Rennes 1 - Campus De Beaulieu

Location: France

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Laboratoire Chrono-Environnement

Location: France

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Linkage Infrastructure, Equipment And Facilities - Grant ID: LE140100082

Start Date: 07-2014

End Date: 11-2015

Amount: $500,000.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE150100094

Start Date: 06-2015

End Date: 12-2018

Amount: $400,000.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE170100079

Start Date: 2017

End Date: 12-2017

Amount: $267,000.00

Funder: Australian Research Council