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With a focus on a class of origami-inspired metamaterials, this work explores the role of panel confinement in their mechanical response under cyclic loading. The goal is twofold: (i) quantify the magnitude change in snapping force and energy dissipation attained by varying the severity of confinement of selected panels; and (ii) leverage insights to modulate in situ their mechanical response as dictated by a given application, hence propose panel confinement modulation as a practical design route for response reprogrammability. Through computational modelling, proof-of-concept fabrication and cyclic testing, we first identify and characterize the governing factors enabling either the alteration or the preservation of the snapping force magnitude during repeated cycles of forward and backward loading. Then, we demonstrate how the in situ modulation of the constrained distance between selected panels enables reprogramming their snapping sequence and energy dissipation. The results contribute to expanding the versatility and application of this class of origami metamaterial across sectors, from aerospace to protective equipment, requiring precise control of mechanical damping and energy dissipation. This article is part of the theme issue 'Origami/Kirigami-inspired structures: from fundamentals to applications'. [ABSTRACT FROM AUTHOR]

With a focus on a class of origami-inspired metamaterials, this work explores the role of panel confinement in their mechanical response under cyclic loading. The goal is twofold: (i) quantify the magnitude change in snapping force and energy dissipation attained by varying the severity of confinement of selected panels; and (ii) leverage insights to modulate in situ their mechanical response as dictated by a given application, hence propose panel confinement modulation as a practical design route for response reprogrammability. Through computational modelling, proof-of-concept fabrication and cyclic testing, we first identify and characterize the governing factors enabling either the alteration or the preservation of the snapping force magnitude during repeated cycles of forward and backward loading. Then, we demonstrate how the in situ modulation of the constrained distance between selected panels enables reprogramming their snapping sequence and energy dissipation. The results contribute to expanding the versatility and application of this class of origami metamaterial across sectors, from aerospace to protective equipment, requiring precise control of mechanical damping and energy dissipation. This article is part of the theme issue 'Origami/Kirigami-inspired structures: from fundamentals to applications'. [ABSTRACT FROM AUTHOR]

Celiac disease (CD) is a chronic immune-mediated small-intestinal disorder. The tissue transglutaminase (TTG) antibodies test is the initial step in the diagnosis of CD. Intussusception is a process where one segment of the bowel invaginates into the lumen of an adjacent segment. Despite that, the association between adult intussusception and CD has been descried previously, and it is still not widely recognized. We report a case of adult intussusception as the first manifestation of CD. A 28-year-old nonalcoholic and nonsmoker, previously healthy man, presented to the emergency department with a 1-week history of progressive diffuse abdominal pain associated with abdominal distension, nausea, vomiting, diarrhea, and 7 kg weight loss. The physical exam was remarkable for thin body habitus with no lymphadenopathy. Laboratory testing was significant for hypochromic microcytic anemia, AST 214 IU/L, ALT 217 IU/L, alkaline phosphatase 183 IU/L, and INR 2.9. An abdominal radiograph showed distended gas-filled small- and large-bowel loops. An abdominal computed tomography scan with contrast was done and demonstrated a telescoping of the small bowel in at least 3 areas with a target sign appearance with no signs of obstruction that suggested small-bowel intussusception. Following this imaging result, the patient was admitted under general surgery and kept nothing by mouth. The surgical team approached the gastroenterology team for push enteroscopy with biopsy which the patient refused. Further investigation included TTG antibodies; IgA and IgG were significantly elevated, 4,965.5 CU and 431.9 CU, respectively (reference: <19.9 CU). The diagnosis of CD leading to adult intussusception was made. The patient was advised to start a gluten-free diet. During the hospital stay, the patient had complete resolution of his symptoms and was discharged home. In summary, this case highlights the potential link between adult intussusception and CD. Adult intussusception is a rare condition that its underlying etiology should be meticulously investigated to expedite treatment and prevent unnecessary surgical intervention. [ABSTRACT FROM AUTHOR]