We present a method for investigating the spatial changes of elastic moduli in a nm-scale vicinity of interfaces. The method is demonstrated on twin walls in PbTiO(3) single crystals. It is revealed that the region near the twin wall is significantly softer than the two domains surrounding it. A comparison with finite element simulations relates this effect to an anelastic relaxation due to point defect accumulation around the twin wall. Local softening around the twin wall can affect the overall elastic modulus in thin films and nanostructured ferroelectric materials, in which the average distance between twin walls is smaller than the thickness of the softer region.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.100.035505 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
High-fidelity computational fluid dynamics modeling to simulate perfusion through a bone-mimicking scaffold.
Comput Biol Med
December 2024
University of Colorado Boulder, Paul M. Rady Department of Mechanical Engineering, Boulder, CO, USA; Biofrontiers Institute, University of Colorado, Boulder, CO, 80309, USA. Electronic address:
Breast cancer cells sense shear stresses in response to interstitial fluid flow in bone and induce specific biological responses. Computational fluid dynamics models have been instrumental in estimating these shear stresses to relate the cell mechanoresponse to exact mechanical signals, better informing experiment design. Most computational models greatly simplify the experimental and cell mechanical environments for ease of computation, but these simplifications may overlook complex cell-substrate mechanical interactions that significantly change shear stresses experienced by cells.
View Article and Find Full Text PDFA comparative study of Twin-Block and van Beek Headgear-Activator on the three-dimensional morphology of the upper airway in growing children with mandibular retraction in skeletal class II malocclusion.
Clin Oral Investig
December 2024
Hospital of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, 510055, China.
Objectives: To compare the variations in the upper airway of children with skeletal Class II mandibular retrognathism treated with van Beek Headgear-Activator (vBHGA) and Twin-Block (TB) appliances.
Materials And Methods: 40 children were involved in this retrospective study and divided into two intervention groups: the vBHGA group and the TB group, each comprising 20 individuals with an average age of 11.13 years.
Gene Expression by a Model Fungus in the Ascomycota Provides Insight Into the Decay of Fungal Necromass.
Environ Microbiol
December 2024
Department of Plant and Microbial Biology, College of Biological Sciences, University of Minnesota, Twin Cities, Minnesota, USA.
Article Synopsis
- Dead fungal cells, referred to as necromass, contribute significantly to long-term soil carbon pools, but the genes responsible for their decomposition are not well understood.
- * The study focused on the fungus Trichoderma reesei and its response to low and high melanin levels in the necromass of another fungus, Hyaloscypha bicolor, revealing over 100 up-regulated genes for carbohydrate-active enzymes (CAZymes) in the presence of necromass compared to glucose.
- * Differential expression of specific genes related to proteases and laccases was noted, particularly linked to the breakdown of melanin, offering insights into the factors affecting carbon turnover rates in this underexplored area of soil biology.
Genetic and epigenetic factors affecting carotid intima-media thickness in monozygotic twins.
Gene
February 2025
Department of Clinical Laboratory and Biomedical Sciences, Osaka University Graduate School of Medicine, Yamadaoka 1-7, Suita, Osaka, Japan; Center for Twin Research, Osaka University Graduate School of Medicine, Yamadaoka 1-7, Suita, Osaka, Japan. Electronic address:
Article Synopsis
- The study investigates the relationship between carotid artery intima-media thickness (IMT), a marker for atherosclerosis, and genetic/epigenetic factors, particularly focusing on monozygotic twins.
- Using ultrasonography and various genetic analyses, researchers found significant associations between specific single nucleotide polymorphisms (SNPs) and DNA methylation patterns affecting IMT.
- Findings suggest that certain genetic variants and methylation changes could help in personalized risk assessments for cardiovascular health related to carotid IMT.
Catheter ablation in a monochorionic diamniotic twin pregnancy: A case report and literature review.
Medicine (Baltimore)
November 2024
Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China.
Rationale: Preexcitation syndrome is an uncommon congenital cardiac disorder that impairs the normal cardiac conduction system. Radiofrequency ablation is one of the most effective treatments for this condition. Nevertheless, radiofrequency ablation is rare in women with preexcitation syndrome during pregnancy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!