We present a simple model of the macroeconomy that includes a role for an assetprice bubble, and derive optimal monetary policy settings for two policy-makers. The first policy-maker, a sceptic, does not attempt to forecast the future possible paths for the asset-price bubble when setting policy. The second policy-maker, an activist, takes into account the complete stochastic implications of th...

PURPOSE To compare the big-bubble method using air and liquid as medium of separation for Descemet membrane endothelial keratoplasty (DMEK) lenticule preparation in an eye bank. METHODS Donor corneas (n=20) were immersed in liquid [tissue culture medium (TCM)]. Air and liquid was injected using a 25-gauge needle in the posterior stroma or as near to the stroma-Descemet membrane (DM) phase as ...

Collagen cross-linking (CXL) is being offered to a growing number of keratoconic patients worldwide for prevention of disease progression, with an overall success rate that exceeds 90% of the treated eyes.1,2 However, some patients do continue to progress after CXL and may need to undergo keratoplasty. Deep anterior lamellar keratoplasty (DALK) has become the preferred technique by an increasin...

I give a general formulation of the constraints on models of in ation ended by a rst order phase transition arising from the requirement that they do not produce too many large (observable) true vacuum voids { the `big bubble problem'. It is shown that this constraint can be satis ed by a simple model in Einstein gravity { a variant of `hybrid' or `false vacuum' in ation. The idea that in ation...

Manuscript received: 13.05.17; Revision accepted: 28.08.17 A 26-year-old female underwent big bubble (BB) deep anterior lamellar keratoplasty (DALK) in the left eye for advanced keratoconus. During the procedure, a Type 2 bubble (T2B) with a clear margin and extending to periphery was noticed [Fig. 1]. As manipulating T2B carries a high risk of rupture of Descemet’s membrane (DM), it was left i...

The deformable models are useful for variety of computer graphics applications. Because they are dynamic, our models are well suited to physics-based animation tasks. This paper deals with a complete computer simulation of soap bubbles from a dynamic perspective, which should prove to be of great interest to physicists and mathematicians. We discuss the dynamic formation of irregular bubble clu...

I give a general formulation of the constraints on models of inflation ended by a first order phase transition arising from the requirement that they do not produce too many large (observable) true vacuum voids – the ‘big bubble problem’. It is shown that this constraint can be satisfied by a simple model in Einstein gravity – a variant of ‘hybrid’ or ‘false vacuum’ inflation. The idea that inf...

China’s decade-long housing boom looks nothing short of a gigantic bubble familiar to many countries: In big cities the price-to-income ratio reached 30 to 1 and the vacancy rate stood at 30% or above. This paper provides a theoretical framework to shed light on the causes and consequences of the great housing boom in China. We argue that the boom could be a rational bubble rooted in China’s un...