The aim of this study was to investigate the level of effectiveness and initial oral English communication needs of Indonesian learners when using OEC to perform the learning activities in the business administration department of Porliteknik Negri Ujung Pandang in Makassar. Conceptually, the needs of learners cover aspect of want, lack and necessity that will be developed as the indicators of ...

Sedimentation combined with a broad particle size distribution in the suspension results multilayered filter cakes, where fine layer forms on top of compressible bottom layer. Owing to their high resistance, particles act as stiff and compress during filtration. This was investigated using model cake composed an artificial Compression determined via volumetric porosity measurement. A reduction ...

The slurry filtration process at a tunnel face plays an important role in supporting pressure transmission, which is crucial to the stability of during shield tunneling. In this paper, series coupled computational fluid dynamics (CFD)–discrete element method (DEM) numerical simulations were carried out model column test. A simplified JKR (Johnson-Kendall-Roberts) was used simulate cohesion betw...

Fair cake-cutting is the division of a cake or resource among N users so that each user is content. Users may value a given piece of cake differently, and information about how a user values different parts of the cake can only be obtained by requesting users to “cut” pieces of the cake into specified ratios. One of the most interesting open questions is to determine the minimum number of cuts ...

In the proposed centrifugal filtration device, a filter is mounted in center of chamber. The particles move towards centrifuge wall away from under force, so cake unlikely to accumulate here. working fluid injected continuously, feed pressure higher than discharge pressure, which compels light-phase leave through as filtrate. filtrate flux rate and movement chamber device were investigated usin...

To study the effect of air humidity on particle filtration performance, Particle Flow Code (PFC) calculation program was used to numerically simulate formation process filter cake. The effects relative deposition morphology, porosity and resistance characteristics cake were revealed. results show that (RH) is mainly reflected in density surface viscosity particles. It found higher humidity, moi...

Fine-grained particle systems build up a highly consolidated and thin layer on the filter medium cause high cake resistance. The objective of novel thin-film filtration process is an effective mechanical separation these using membranes vacuum drum filter. stability membrane evaluated since roller required for discharge performance compared with that commonly used cloth. Analyses reveal surface...

The penetration characteristics of the slurry and support pressure transfer mechanisms are critical to tunnel face stability control during a mechanized excavation. In this paper, numerical calculations coupling computational fluid dynamics (CFD) with discrete element method (DEM) carried out simulate sand column tests considering different particle size ratios. reasonableness model is verified...