Velocity models can be automatically updated by differential semblance velocity analysis (DSVA). To overcome the dip limitations associated with the one-way wave equation based imaging algorithms, we propose in this study that the common image gathers can be defined other than in horizontal offset domain within the reverse time migration(RTM) framework, where two-way wave equation is solved as ...

Resin Transfer Molding (RTM) is a polymer composite processing technique widely used in the aeronautics and automotive sectors. This paper describes the numerical simulation of the RTM process where Darcy’s law was used for the mathematical formulation of the problem. A control volume finite element method was used for the determination of pressure gradients inside the mold, and a geometric rec...

Textile technology and resin transfer molding (RTM) process have been combined to manufacture composites coil springs. Preforms for coil springs were made by braiding process, in which axial yarns are located in the central region and braiding yarns covered them circumferentially. The geometric and process parameters that are related with the fiber orientation and fiber volume fraction of the b...

Reverse-time migration (RTM) represents one of the most accurate, but also one of the costliest algorithms available for imaging in complex media. The RTM computational cost can be reduced by shot encoding, i.e. by imaging simultaneously a large number of shots. This approach reduces computational cost if the number of encoded seismic experiments is smaller than the number of shots. Different e...

A method for creating a tissue model using a female rabbit for laparoscopic simulation exercises is described. The specimen is called a Rabbit Tissue Model (RTM). Dissection techniques are described for transforming the rabbit carcass into a small, compact unit that can be used for multiple training sessions. Preservation is accomplished by using saline and refrigeration. Only the animal trunk ...

Reversible computing is a paradigm of computation that reflects physical reversibility, one of the fundamental microscopic laws of Nature. In this survey, we discuss topics on reversible logic elements with memory (RLEM), which can be used to build reversible computing systems, and their universality. An RLEM is called universal, if any reversible sequential machine (RSM) can be realized as a c...

To the Editor: Spliceosome-mediated RNA trans-splicing (SMaRT) has emerged as a novel technology for the repair of mutations in monogenic disorders. SMaRT can be used to replace 5′, 3′, or internal sequences in an exon-wise manner. For this purpose, RNA trans-splicing molecules (RTMs) are engineered, which comprise (i) the wild-type coding region to be replaced, (ii) a splicing domain that incl...

Trust plays an important role in social life as well as in cyberspace. Trust establishment in cyberspace relies on human beings as well as digital components. Trusted computing platform (TCP) was proposed to improve the trust between users and their devices. However, current TCP lacks solutions for trust sustainability among TCPs, so that trust relationship might be broken after a period of tim...

Applications to process seismic data employ scalable parallel systems to produce timely results. To fully exploit emerging processor architectures, application will need to employ threaded parallelism within a node and message passing across nodes. Today, MPI+OpenMP is the preferred programming model for this task. However, tuning hybrid programs for clusters is difficult. Performance tools can...

SUMMARY Efficient numerical wave modelling is essential for imaging methods such as reverse-time migration (RTM) and full waveform inversion (FWI). In 2D, frequency-domain modelling with LU factorization as a direct solver can outperform time-domain methods by one order. For 3-D problems, the computational complexity of the LU factorization as well as its memory requirements are a disadvantage ...