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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Application of statistical multivariate techniques to wood quality data.

Negash, Asnake Worku. January 2010 (has links)
Sappi is one of the leading producer and supplier of Eucalyptus pulp to the world market. It is also a great contributor to South Africa economy in terms of employment opportunity to the rural people through its large plantation and export earnings. Pulp mills production of quality wood pulp is mainly affected by the supply of non uniform raw material namely Eucalyptus tree supply from various plantations. Improvement in quality of the pulp depends directly on the improvement on the quality of the raw materials. Knowing factors which affect the pulp quality is important for tree breeders. Thus, the main objective of this research is first to determine which of the anatomical, chemical and pulp properties of wood are significant factors that affect pulp properties namely viscosity, brightness and yield. Secondly the study will also investigate the effect of the difference in plantation location and site quality, trees age and species type difference on viscosity, brightness and yield of wood pulp. In order to meet the above mentioned objectives, data for this research was obtained from Sappi’s P186 trial and other two published reports from the Council for Scientific and Industrial Research (CSIR). Principal component analysis, cluster analysis, multiple regression analysis and multivariate linear regression analysis were used. These statistical analysis methods were used to carry out mean comparison of pulp quality measurements based on viscosity, brightness and yield of trees of different age, location, site quality and hybrid type and the results indicate that these four factors (age, location, site quality and hybrid type) and some anatomical and chemical measurements (fibre lumen diameter, kappa number, total hemicelluloses and total lignin) have significant effect on pulp quality measurements. / Thesis (M.Sc.)-University of KwaZulu-Natal, Pietermaritzburg, 2010.
2

Perceptions of the forestry industry : a case study of Sappi forests in Richmond.

Mwale, Chimika. January 2000 (has links)
Commercial forestry in South Africa was born out of the need to alleviate the growing demand on limited natural resources. From small beginnings, the industry has grown over the years and currently plays a significant role in South Africa's economy. The industry is a source of employment, foreign exchange and it facilitates a number of downstream processing activities. However, with the growth of the industry, there has also been increasing concern from various sectors over the impacts of the industry on the environment, particularly on water and biodiversity. More recently, concern has also shifted towards challenging the social and economic benefits of timber to local communities. As a result of growing pressure, legislation, policies and institutions have been transformed to ensure that environmental and social issues are taken into consideration in carrying out any form of development. The forestry industry has also changed considerably and understanding stakeholders perceptions has also become evident. In 1995 as part of the process to adhere to ISO 14001 international standards, Sappi forests commissioned a study to enable them to have a better understanding of activities, products and services which could have an impact on the environment. The concerns of the stakeholder were incorporated into their management plan. In continued efforts to improve the image of the forestry industry, this study was commissioned in 1999 with the aim of understanding how peoples perceptions of the industry had changed since 1995. The change of perceptions was determined through structured as well as semi structured interviews. A comparison between the responses in this study with those in Murphy et al. 1995 was undertaken to determine how peoples perceptions had changed since 1995. Even though the forestry industry had included some of the concerns raised by stakeholder and improved their management plans since 1995, peoples perceptions ofthe industry were largely negative. External changes leading to increased awareness in the intervening period were seen as the reason for the lack of change in peoples perceptions. Among others the external changes include increased transformation of environmental legislation both internationally and nationally which is more focused on addressing social as well as environmental issues. / Thesis (M.Sc.)-University of Natal, Pietermaritzburg, 2000.

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