Displacements and stress-field changes associated with earthquakes, volcanoes, landslides and human activity are often simulated using numerical models in an attempt to understand the underlying processes and their governing physics. The application of elastic dislocation theory to these problems, however, may be biased because of numerical instabilities in the calculations. Here, we present a…

Full-waveform inversion (FWI) provides a high-resolution velocity model, but carries a high computational cost. Additionally, modern seismic acquisition, with dense sources and receivers, generates massive data, resulting in an even greater computational cost. To reduce the computational burden of FWI, we have developed an FWI algorithm using plane-wave data. Using this approach, plane-wave gat…

The seismic investigation of the lowermost mantle is in many places hampered by the lack of suitable source–receiver combinations that sample the D" region and have to meet the requirements of a suitable epicentral distance range. The low velocity regions beneath the central Pacific and Atlantic Oceans in particular have been sampled in fewer places than circum Pacific regions. In…

The possibility for independently evolving entities to form and persist in the absence of sexual recombination in eukaryotes has been questioned; nevertheless, there are organisms that are known to be asexual and that have apparently diversified into multiple species as recognized by taxonomists. These organisms have therefore been identified as an evolutionary paradox. We explore three alterna…

The food security debate has focused largely on the farm sector and on trade. Relatively neglected or �hidden� from mainstream debate are the middle segments (processing, logistics, wholesale) of agrifood value chains in developing countries�and yet this �midstream� forms 30�40 per cent of the value added and costs in food value chains. The productivity of the mids…

Research in general education suggests that relationship-building is at the core of quality learning experiences. Yet relationship-building has not received the attention, it deserves from researchers in the field of TESOL where teacher–student relationships of various types are a central component in successful teaching and learning. This article examines the perspectives of three experience…

We generalize the Gleason–Kahane–Z˙ elazko theorem to modules. As an application, we show that every linear functional on a Hardy space that is non-zero on the outer functions is a multiple of a point evaluation. A further consequence is that every linear endomorphism of a Hardy space that maps outer functions to nowhere-zero functions is a weighted composition operator. In neither cas…

Tahun Terbit

2011

Tahun Terbit

2012

Tahun Terbit

2012