Learning Objectives: After studying this article, the participant should be able to: 1. Assess the suitability of a patient for prosthetic reconstruction. 2. Understand the principles of dimensional planning for implant and expander selection. 3. Discuss the advantages and disadvantages of immediate versus delayed expander/implant reconstruction. 4. Apply the surgical techniques of immediate an...

We say that a graph G = (V,E) on n vertices is a β-expander for some constant β > 0 if every U ⊆ V of cardinality |U | ≤ n 2 satisfies |NG(U)| ≥ β|U | where NG(U) denotes the neighborhood of U . We explore the process of uniformly at random deleting vertices of a β-expander with probability n for some constant α > 0. Our main result implies that as n tends to infinity, the deletion process perf...

The tissue expander has found widespread use in reconstructive surgery. The donor area is needed, the recipient site with similar characteristics (color, thickness, hair follicle) features, minimal scarring and leads to donor site morbidity. In our study, presented face, scalp and neck reconstruction results obtained with the use of expander. The face, scalp and neck areas expander was used to ...

This paper will introduce expander graphs. Kolmogorov and Barzdin’s proof on the three dimensional realization of networks will be discussed as one of the first examples of expander graphs. The last section will discuss error correcting code as an application of expander graphs to computer science.

of 14 cases who underwent this operation only in one of them because of infection in operation site, we had to extract the expander. also, in the first day of the operation that we injected serum inside the expander of two other patients, the wound opened up and the expander appeared and came out automatically. the remaining ten patients have tolerated the operation after treatment period witho...

This study investigated the effect of the built-in volume ratio of an expander on the performance of a dual-loop Rankine cycle system for the engine waste heat recovery of a vehicle. Varying vehicle operating conditions can cause a positive displacement expander to operate in both underand over-expansion states. Therefore, analysis of the off-design performance of the expander is very important...

Carbon dioxide (CO2) as a natural refrigerant is one candidate alternative to HFC refrigerants. But CO2 system has lower efficiency and is not yet competitive concerning the COP. The most effective method to improve the efficiency of the transcritical CO2 system is to replace the throttling device with an expander. In this paper, a two-cylinder rolling piston expander without inlet valve has be...

SUMMARY Removal of an intact, inflated tissue expander can result in uncontrolled spillage of expander contents on the drapes, surgeons, staff, or patient. The technique described has been used for the past 4 years to eliminate these spillage concerns. It is simple and inexpensive using common disposable supplies found in any operating room. An irrigating syringe is modified by cutting away its...

A series of failures of a radial inflow hot gas expander driving a centrifugal compressor in a nitric acid plant plagued the second author’s former company over a 24 year period. The 19,000 hp single-stage radial inflow expander inlet and discharge blade tips would fail in service, destroying the inlet nozzle vanes and expander wheel, and causing extensive damage to the rotor, bearings, seals, ...