We reveal significant qualitative differences in the rigidity transition of three types of disordered network materials: randomly diluted spring networks, jammed sphere packings, and stress-relieved networks that are diluted using a protocol that avoids the appearance of floppy regions. The marginal state of jammed and stress-relieved networks are globally isostatic, while marginal randomly dil...

It is well known that oxide glasses build up continuous networks. Therefore the rigidity of the latter plays a key role in understanding glass properties. The network switches from floppy to rigid if the number of covalent bridges between the network formers exceeds a certain threshold value. One and the same structure could behave as rigid network in respect to some properties and could be flo...

A 52-year-old man with no previous medical history, but a high body mass index (BMI) >34, presented with a sudden onset of a painful, apparently proptosed left eye and decreased left vision (see figure 1). He had rubbed his eye on waking. On examination, there was no relative afferent pupillary defect. Snellen chart testing was 6/12 (pinhole 6/6) ocular sinistra (OS) and 6/6 ocular dextra (OD)....

The floppy infant syndrome is a well-recognized entity for pediatricians and neonatologists. The condition refers to an infant with generalized hypotonia presenting at birth or in early life. The diagnostic work up in many instances is often complex, and requires multidisciplinary assessment. Advances in genetics and neurosciences have lead to recognition of newer diagnostic entities (several c...

We study the linear and nonlinear elastic behavior of amorphous systems using a two-dimensional random network of harmonic springs as a model system. A natural characterization of these systems arises in terms of the network coordination (average number of springs per node) relative to that of a marginally rigid network deltaz: a floppy network has deltaz<0, while a stiff network has deltaz>0. ...

We study the statistical properties of the potential energy landscape of a system of particles interacting via a very short-range square-well potential (of depth -u0) as a function of the range of attraction Delta to provide thermodynamic insights of the Noro and Frenkel [M. G. Noro and D. Frenkel, J. Chem. Phys. 113, 2941 (2000)] scaling. We exactly evaluate the basin free energy and show that...

Intraoperative floppy-iris syndrome (IFIS) is associated with the use of systemic alpha(1)-antagonists, and tamsulosin in particular. The incidence and severity of IFIS are variable; however, the syndrome is associated with a higher rate of cataract surgical complications, especially when the condition is not recognized or anticipated. Questioning cataract patients preoperatively about current ...