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...