This study investigated the microbial community in a full scale anaerobic baffled reactor and sequencing batch reactor system for oil-produced water treatment in summer and winter. The community structures of fungi and bacteria were analyzed through polymerase chain reaction–denaturing gradient gel electrophoresis and Illumina high-throughput sequencing, respectively. Chemical oxygen demand eff...

The effects of ultrasonication of corn slurry, on particle size distribution and enzymatic hydrolysis was studied for the dry-grind mill ethanol industry. Two independent ultrasonic experiments were conducted at a frequency of 20 kHz; in batch and continuous systems. The ground corn slurry (33% m/v) was pumped at flow rates 10-28 L/min in continuous flow experiments, and sonicated at constant a...

The rounding of orders to achieve a batch size is recognised as a source of the bullwhip problem within supply chains. While it is often advocated that batch sizes should be reduced as much as possible, there has been limited investigation into the impact of batching on bullwhip. Here we consider scenarios where orders are placed only in multiples of a fixed batch size, for both deterministic a...

The transient analysis of a queuing system with fixed-size batch Poisson arrivals and a single server with exponential service times is presented. The focus of the paper is on the use of the functions that arise in the analysis of the transient behaviour of the queuing system. These functions are shown to be a generalization of the modified Bessel functions of the first kind, with the batch siz...

A single server finite population queueing model with compulsory server vacation and with fixed batch service has been considered. For this model the system steady state probabilities are obtained. Some performance measures are calculated and numerical examples are also given.  

As time-sharing machines are replaced by powerful desktop computers and farms of workstations replace mainframes, more and more users turn to workstations when they need CPU cycles for their batch jobs. Unfortunately, they do not find workstations a very friendly environment for batch processing. Since these types of machines were originally designed as a single user environment, they lack most...

The batch scheduler is an important system software serving as the interface between users and HPC systems. Users submit their jobs via batch scheduling portal and the batch scheduler makes scheduling decision for each job based on its request for computing sources, i.e. core-hours. However, jobs submitted to HPC systems are usually parallel applications and their lifecycle consists of multiple...

In order to determine the efficiency of a production system, batch size and throughput are two important parameters that must be considered. In order to ensure system efficiencies and meet optimum utilization, batch size must conform to the throughput. The use of Queuing Network Theory to study the effect of batch size and throughput in optimizing the resource utilization, particularly machine ...

In this paper we provide a numerical analysis of the M D N queueing system This system consists of an in nite bu er and N identical batch servers with batch capacity b It serves as a model for various types of workstations in the manufacturing context Using an approach presented by Crommelin we derive the distribution of the number of lots waiting in queue at arbitrary time instants and the dis...