Experimentation with the selection silvicultural system in the Engelmann Spruce-Subalpine Fir (ESSF) Zone of east-central British Columbia began nearly ten years ago. The initial impetus for partial cutting came from concerns about specific nontimber resources, such as scenic values, water quality for domestic use, and habitat for mountain caribou (Rangifer tarandus). A set of first-generation ...

We describe a new hierarchical 2D-guillotine Cutting Stock Problem. In contrast to the classic cutting stock problem, waste is not an issue. The problem relates to the removal of a defective part and assembly of the remaining parts into homogeneous size blocks. The context is the packing stages of cake manufacturing. The company’s primary objective is to minimise total processing time at the su...

The three processes of urbanization, industrialization and globalization are positively correlated with municipal solid waste generation and energy consumption in global urban centers. Heavy reliance on fossil fuels in most world cities has contributed not only to global warming and climate change, but also to astronomical increases and volatility in the prices of energy sources. Africa has suf...

The paper presents findings from a government funded, industry-based study of timber handling tasks in New Zealand log sawmills, and discusses some of the issues encountered in conducting a long term study of this type. Twelve months’ of accident register records from a sample of log sawmills were first analysed to determine the tasks most commonly linked with musculoskeletal disorders (MSD). W...

Abstract This work investigates the machinability characteristics of additively manufactured Ti6Al4V titanium alloy workpieces in finishing machining using ball end mills on 45° inclined surfaces. The surface finish results were compared with ones from milling trials wrought samples same cutting conditions. Optical profilometry and scanning electron microscope imaging used to compare different ...

We consider in this paper a two echelon timber procurement system in which the first echelon consists of multiple harvesting blocks and the second echelon consists of multiple mills (e.g., sawmills), both distributed geographically. Demand is put forward by mills in the form of volumes of logs of specific length and species. Due to the impact of log handling and sorting on cut-to-length harvest...

Solid waste management has moved to the forefront of the environmental agenda. Nations are considering restrictions on packaging and controls on products in order to reduce solid waste generation rates. Local and regional governments are requiring wastes to be separated for recycling, and some have even established mandatory recycling targets. However, industrial and everyday activities continu...

This project focuses on optimizing the location of WEEE collection points for waste electrical and electronic equipment (WEEE) which consists of determining a set of locations to install a network of gathering equipment. It is implemented using open source technologies following the current tendency of the present software market situation. In particular, the software application to be develope...

New palm oil mill processes are characterized by advanced oil separation technologies with zero dilution water (‘ECO-D’ for example as a new system for oil recovery without dilution water) and continuous sterilization of the fresh fruit bunch (FFB). These processes have a deep impact on the amount and composition of waste water (POME). Compared to conventional palm oil mills the total amount of...