AI Article Synopsis
- When large stresses are applied to crystals at high temperatures, they can deform irreversibly, a process called plasticity caused by moving defects like dislocations.
- Researchers found that helium 4 crystals, under pure conditions and at absolute zero, exhibit a unique form of plasticity that is both reversible and anisotropic (direction-dependent).
- This enhanced plasticity occurs in a specific direction where dislocations move easily, but it gets disrupted in the presence of helium 3 impurities or when dislocations collide with thermal phonons.
Article Abstract
When submitted to large stresses at high temperature, usual crystals may irreversibly deform. This phenomenon is known as plasticity and it is due to the motion of crystal defects such as dislocations. We have discovered that, in the absence of impurities and in the zero temperature limit, helium 4 crystals present a giant plasticity that is anisotropic and reversible. Direct measurements on oriented single crystals show that their resistance to shear nearly vanishes in one particular direction because dislocations glide freely parallel to the basal planes of the hexagonal structure. This plasticity disappears as soon as traces of helium 3 impurities bind to the dislocations or if their motion is damped by collisions with thermal phonons.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.110.035301 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Human calpain-3 and its structural plasticity: dissociation of a homohexamer into dimers on binding titin.
J Biol Chem
December 2024
Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L 3N6, Canada. Electronic address:
Calpain-3 is an intracellular Ca-dependent cysteine protease abundant in skeletal muscle. Loss-of-function mutations in its single-copy gene cause a dystrophy of the limb-girdle muscles. These mutations, of which there are over 500 in humans, are spread all along this 94-kDa multi-domain protein that includes three 40+-residue sequences (NS, IS1, and IS2).
View Article and Find Full Text PDFMultidisciplinary Treatment of A Class III Patient With Giant Open Bite Secondary to Macroglossia.
J Craniofac Surg
October 2024
State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Center of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan.
Skeletal Class III malocclusion deformity is one of the most common maxillofacial malocclusions in East Asia and is either due to maxillary retrusion, mandibular protrusion, or both. It could cause functional and aesthetic problems. This deformity could be attributed to either hereditary or environmental factors or both.
View Article and Find Full Text PDFClinical results of knee juxta-articular giant-cell tumors treated with bone cement filling and internal fixation after extensive curettage.
Jt Dis Relat Surg
January 2025
Department of Orthopaedics, Changzhou Hospital Affiliated to Nanjing University of Chinese Medicine, Changzhou, Jiangsu Province, China.
Objectives: This study was to evaluate the radiological and clinical outcomes of patients with juxta-articular giant-cell tumors (GCTs) around the knee treated with bone cement filling and internal fixation after extensive curettage.
Patients And Methods: A total of 15 patients (6 males, 9 females; mean age: 35.3±8.
Passive plasticity and a sex difference in the predictability of mobility.
Biol Lett
December 2024
Département des Sciences biologiques, Université du Québec à Montréal, Montréal, Canada.
Behavioural predictability describes the behavioural variability of an individual. Unpredictability can arise from many sources including non-adaptive passive plasticity in which an environmental factor acts directly on the individual to create non-adaptive phenotypic variation. In this study, I use radiotelemetry to field test the hypothesis that Cook Strait giant weta (Orthoptera: Anostostomatidae) exhibit a sex difference in the predictability of their nightly travel distance due to passive behavioural plasticity.
View Article and Find Full Text PDFUtility of Keystone Flap in Armory of Dermatosurgeons.
Indian J Dermatol
October 2024
Department of Burns and Plastic Surgery and Hypospadias and VVFs Clinic, Postgraduate Institute of Medical Sciences (PGIMS), University of Health Sciences, Rohtak (UHSR), Haryana, India.
Purpose And Background: To create awareness among dermatosurgeons about the versatility of keystone flaps in re-surfacing post-excisional small, medium and large skin defects.
Aims And Objectives: Single-staged tension-free re-surfacing of various sized skin defects using keystone flap and to have least donor site morbidity, primary healing and maximum functional outcome.
Material And Methods: This retrospective study was conducted, between October 2021 - January 2023 in Department of Plastic Surgery, PGIMS Rohtak, on 15 males and 1 female aged between 18 - 65 years.
Want 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!