Air trench structures for reduced-size bends in lowindex contrast waveguides are proposed. To minimize junction loss, the structures are designed to provide adiabatic mode shaping between lowand high-index contrast regions, which is achieved by the introduction of “cladding tapers.” Drastic reduction in effective bend radius is predicted. We present two-dimensional (2-D) finite-difference time-...

The diffraction of obliquely incident surface waves by an asymmetric trench is investigated using linearized potential theory. A numerical solution is constructed by matching particular solutions for each subregion of constant depth along vertical boundaries ; the resulting matrix equation is solved numerically. Several cases where the trench-parallel wavenumber component in the incident-wave r...

We describe a technique to manage cataracts of grade NO2-NO4 based on LOCS III (Chylack et al, 1993) classification using a minor modification of stop and chop technique (Koch et al, 1994) using a peristaltic phaco machine. After completing capsulorrhexis of 6.0 -7.0 mm diameter, nucleus is partially prolapsed during hydrodissection, into the anterior chamber filled with OVD. After dialling bac...

[1] We present the first regional surface velocity field for Central America, showing crustal response to interaction of the Cocos and Caribbean plates. Elastic half-space models for interseismic strain accumulation on the dipping subduction plate boundary fit the GPS data well and show strain accumulation offshore and beneath the Nicoya and Osa peninsulas in Costa Rica but not in Nicaragua. Si...

The 2011 Tohoku earthquake (Mw = 9.1) highlighted previously unobserved features for megathrust events, such as the large slip in a relatively limited area and the shallow rupture propagation. We use a Finite Element Model (FEM), taking into account the 3D geometrical and structural complexities up to the trench zone, and perform a joint inversion of tsunami and geodetic data to retrieve the ea...

Coevolution between hosts and their parasites is expected to follow a range of possible dynamics, the two extreme cases being called trench warfare (or Red Queen) and arms races. Long-term stable polymorphism at the host and parasite coevolving loci is characteristic of trench warfare, and is expected to promote molecular signatures of balancing selection, while the recurrent allele fixation in...

on diphtheria. The former is written by Dr. Melville D. Mackenzie, whose experience of the disease in all parts of the world is unique among British physicians. Dr. E. H. R. Harries has written the chapter on diphtheria, which has proved to be one of the major medical problems in the Middle East.' ' The most important additions to this edition apart from those already mentioned are in connectio...

[1] Flat or shallow subduction is a relatively widespread global occurrence, but the dynamics remain poorly understood. In particular, the interaction between flat slabs and the surrounding mantle flow has yet to be studied in detail. Here we present measurements of seismic anisotropy to investigate mantle flow beneath the Peruvian flat-slab segment, the largest present-day region of flat subdu...