Understanding the dynamical behavior of Granular Media (GM) is extremely important to many industrial processes. Thus simulating the dynamics of GM is critical in the design and optimization of such processes. However, the dynamics of GM is complex in nature and cannot be described by a closed form solution for more than a few particles. A popular and successful approach in simulating the under...

This paper will discuss the entire process of acquiring and deploying Hopper from the first vendor market surveys to providing 3.8 million hours of production cycles per day for NERSC users. Installing the latest system at NERSC has been both a logistical and technical adventure. Balancing compute requirements with power, cooling, and space limitations drove the initial choice and configuration...

It is sometimes assumed that the process of reanalysis of a borrowed prefix as productive is a simple process of detachment from the borrowed base and subsequent re-attachment to a native one. If this is reanalysis, however, it is so in a limited sense. It is not, for example, an instance of ambiguity resolution (see Lewis 1998: 2489), since the result of the process is to add to the stock of m...

The first is the burning of large tracts of forests in Indonesia (in Sumatra and Kalimantan, the Indonesian part of Borneo). Estimates of the total area of forest damaged by the fires vary from the official figure of 750,000 hectares to the figure of 1.7 million hectares made by the Indonesian environmental group WALHI.1 The forest fires, which have been going on for months, have created an eno...

Convential models for the erosion of non-cohesive sediments overestimate the erosion rate induced by high flow velocities. These high flow velocities occur, for instance, in breaching of embankments or dunes (flow velocities up to 10 m/s) or in jetting sand with a trailing suction hopper dredger (30 to 60 m/s). At these very large flow velocities the erosion process is significantly influenced ...

Proses pemasukan material jenis Ferrite Ni-Zn series secara manual pada mesin press berkapasitas 10 tonase dan 20 dari tempat bak penampung ke dengan berceceran rata-rata 8 kg dalam sehari di lantai produksi. Sampai press, operator naik untuk memasukkan raw bagian hopper mesin. tersebut membutuhkan waktu 9,62 menit. Untuk mengurangi kecelakaan kerja, efisiensi penggunaan maka diperlukan inovasi...

Poor understanding of the flow behavior granular biomass material poses great challenges for bioenergy industry, as equipment functioning time is significantly reduced by handling issues like screw feeder clogging and hopper arching. In this work, loblolly pine chips, including mass rate critical outlet width, in a wedge-shaped investigated combining physical experiments numerical simulations. ...

Gravity flows of granular materials through hoppers are considered. For hoppers shaped as general nonaxisymmetric cones, i.e., “pyramids”, the flow inherits some simplified features from the geometry: similarity solutions can be constructed. Using two different plasticity laws, namely Matsuoka-Nakai and von Mises, those solutions are obtained by solving first order nonlinear partial differentia...