As is well known, the extrusion rate of polymers from a cylindrical tube or slit (a "die") is in practice limited by the appearance of "melt fracture" instabilities which give rise to unwanted distortions or even fracture of the extrudate. We present the results of a weakly nonlinear analysis which gives evidence for an intrinsic generic route to melt fracture via a weakly nonlinear subcritical...

AIM To describe postoperative surgical success of either Ahmed or Baerveldt tube shunt implantation for eyes with medically uncontrolled traumatic glaucoma. MATERIALS AND METHODS A review was carried out to identify patients with traumatic glaucoma that required tube shunt implantation between 2009 and 2015 at Rutgers University in Newark, New Jersey, USA. Seventeen eyes from 17 patients met ...

A patient with lipomyelomeningocele (known in utero) presented for MRI characterization prior to surgical procedure at three months of age. Cross-sectional imaging revealed a spinal dysraphism of the lower lumbar spine, with a posterior spinal defect spanning L4 to S2 subcutaneous fat intrusion, and distal spinal cord extrusion. An osseous excrescence was also appreciated, articulating with the...

Abstract Minimally invasive in situ bioprinting can potentially enhance the advantages of bioprinting, allowing surrounding healthy tissue to be maximally preserved. However, requirements for such a device are manifold and challenging fulfill. We present an experimental platform consisting extrusion system based on tube mounted between syringe dispensing nozzle. investigated influence material ...

In the process of double-layer gas-assisted extrusion plastic micro-tubes, external size and surface quality micro-tubes are greatly affected by assisting gas inlet slit inside mold. Therefore, in this experiment, a two-phase flow model was established based on compressible non-compressible melt. The Polyflow finite element solution software module used to solve velocity field, temperature pres...

A 16-year-old Class II female patient was treated without tooth extraction. The upper first molars were distalized by the Pendulum appliance. After six months, the molars tipped significantly to the distal. To correct this side effect, we decided to upright the molars using skeletal anchorage. On each side, a mini-screw was inserted between first and second premolars in the buccal cortical plat...