Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection.

Surface crack detection and sizing is essential for the manufacturing and maintenance of engines, run parts, and other metal elements of aircrafts. Among various non-destructive detection methods, the fully non-contact and non-intrusive technique based on laser-stimulated lock-in thermography (LLT) has recently attracted a lot of attention from the aerospace industry. We propose and demonstrate a system of reconfigurable LLT for three-dimensional surface crack detection in metal alloys. For large area inspection, the multi-spot LLT can speed up the inspection time by a factor of the number of spots. The minimum resolved size of micro-holes is ~50 µm in diameter limited by the magnification of the camera lens. We also study the crack length ranging from 0.8 to 3.4 mm by varying the modulation frequency of LLT. An empirical parameter related to the thermal diffusion length is found to show the linear dependence with the crack length. With the proper calibration, this parameter can be used to predict the sizing of the surface fatigue cracks. Reconfigurable LLT allows us to quickly locate the crack position and accurately measure its dimensions. This method is also applicable to the non-destructive detection of surface or sub-surface defect in other materials used in various industries.

Thermodynamics-Guided High-Throughput Discovery of Eutectic High-Entropy Alloys for Rapid Solidification.

Excellent castability, significantly refined microstructure, and good mechanical properties make eutectic high-entropy alloys (EHEAs) a natural fit for rapid solidification processes, e.g., additive manufacturing. Previous investigations have focused on developing EHEAs through trial and error and mixing known binary eutectic materials. However, eutectic compositions obtained from near-equilibrium conditions do not guarantee a fully eutectic microstructure under rapid solidifications. In this work, a thermodynamically guided high-throughput framework is proposed to design EHEAs for rapid solidification. Empirical formulas derived from past experimental observations and thermodynamic computations are applied and considered phase growth kinetics under rapid solidification (skewed phase diagram). The designed alloy candidate, Co25.6Fe17.9Ni22.4Cr19.1Ta8.9Al6.1 (wt.%), contains nanostructured eutectic lamellar and shows a high Vickers hardness of 675 Hv. In addition to this specific composition, the alloy design toolbox enables the development of new EHEAs for rapid solidification without the limitation of previous knowledge.

Diabetes education self-management intervention in improving self-efficacy for people with type 2 diabetes in the Gulf Cooperation Council countries: A systematic review.

AIMS: This research aims to evaluate the effectiveness of diabetes education self-management intervention for improving self-efficacy for people with type 2 diabetes mellitus in the Gulf Cooperation Council countries. METHODS: The Joanna Briggs Institute's methodology was applied to conduct a systematic review of type 2 diabetes interventions published from 2012 to 2022. This involved searching major databases, including Ovid, CINAHL, Scopus, Web of Science, and PubMed, with specific inclusion and exclusion criteria. The focus was on studies involving adults aged 18 or older with a Type 2 Diabetes (T2D) diagnosis, randomized controlled trials, and full-text English-language articles, while excluding materials such as editorials and conference abstracts. RESULTS: A total of 689 relevant articles initially retrieved; ultimately, only five studies met the inclusion criteria of this review. All five included studies were randomised control trials, and all five studies indicated that there was a significant and positive impact of diabetes education self-management intervention on diet and physical activities. Furthermore, three of the included studies indicated that interventions led to a substantial reduction in the levels of glycosylated haemoglobin (HbA1c) among people with type 2 diabetes. CONCLUSIONS: Diabetes education is an effective way of improving the health outcomes of people with type 2 diabetes. Diabetes education self-management interventions significantly increase the self-efficacy of people with Type 2 Diabetes (T2D) by enabling them to effectively control their blood glucose levels. Therefore, this study recommended that the GCC countries need to implement education intervention programmes to help and support people with Type 2 Diabetes.

Patient Assessment of Care with Chronic Cardiovascular Disorders and Its Relationship with Self-Efficacy: A Cross-Sectional Study.

INTRODUCTION: Patients' assessment of care navigating cardiovascular disorders is imperative in improving the quality of care provided. The purpose of this study was to explore the perspectives of people living with cardiovascular disorders on the care they received and its relationship with general self-efficacy. METHODS: This investigation employed a cross-sectional correlational approach. The study sample was comprised of patients with cardiovascular disorders from both the King Khalid Hospital and the King Salman Specialist Hospital, in Hail City, Saudi Arabia. Convenience sampling was used, resulting in 104 participants. A survey using a self-administered questionnaire was employed to collect the data, which ran from 10 March to 20 May 2023. RESULTS: The participants perceived that they occasionally (2.75 ± 1.053) received care, and they perceived themselves to have better self-efficacy (25.28/40). Of note, the age (0.062), years of being diagnosed with having the disease (-0.174), sex (0.180), educational attainment (0.125), and occupation (0.206) were found to have no significant relationship with the patient assessment of care with chronic cardiovascular disease (PACIC). However, civil status (0.867) was found to have a strong positive correlation to the PACIC. No significant relationship was found between age and GSE (0.070) and PACIC (0.62), civil status with GSE (0.013), years being diagnosed with having the disease with GSE (0.095), and PACIC (0.174) educational attainment with GSE (0.088) and PACIC (0.125) or occupation (0.115) with GSE. However, sex (0.795) was found to have a strong correlation with general self-efficacy (GSE). Of note, patient activation (0.390) and goal setting (0.360) had a moderate positive correlation while problem solving (0.228) and follow-up (0.278) had a weak positive correlation to GSE. Meanwhile, the delivery system (0.507) had a strong positive correlation to GSE. This study illuminates the value of self-efficacy and patient involvement as self-management techniques for cardiovascular illnesses. Future cardiovascular illness self-management initiatives should concentrate on enhancing patient self-efficacy by adopting the PACIC.

Effects of annealing on performances of 1.3-µm InAs-InGaAs-GaAs quantum dot electroabsorption modulators.

In this work, we investigated the effects of quantum dot (QD) annealing (as-grown, 600°C-annealed, and 750°C-annealed) on the preliminary performances of 1.3-µm InAs-InGaAs-GaAs quantum dot electroabsorption modulators (QD-EAMs). Both extinction ratio and insertion loss were found to vary inversely with the annealing temperature. Most importantly, the 3-dB response of the 750°C-annealed lumped-element QD-EAM was found to be 1.6 GHz at zero reverse bias voltage - the lowest reverse bias voltage reported. We believe that this work will be beneficial to researchers working on on-chip integration of QD-EAMs with other devices since energy consumption will be an important consideration.