Investigating the CO2 laser cutting parameters of MDF wood composite material

Laser cutting of medium density fibreboard (MDF) is a complicated process and the selection of the process parameters combinations is essential to get the highest quality of the cut section. This paper presents laser cutting of MDF based on design of experiments (DOE). CO2 laser was used to cut three thicknesses 4, 6 and 9 mm of MDF panels. The process factors investigated are: laser power, cutting speed, air pressure and focal point position. In this work, cutting quality was evaluated by measuring, upper kerf width, lower kerf width, ratio between the upper kerf width to the lower kerf width, cut section roughness and the operating cost. The effect of each factor on the quality measures was determined and special graphs were drawn for this purpose. The optimal cutting combinations were presented in favours of high quality process output and in favours of low cutting cost

Evalaution and optimization of laser cutting parameters for plywood materials

Laser process parameters influence greatly the width of kerfs and quality of the cut edges. This article reports experiments on the laser plywood-cutting performance of a CW 1.5 kW CO2¬ Rofin laser, based on design of experiments (DOE). The laser was used to cut three thicknesses 3, 6 and 9 mm of plywood panels. The process factors investigated are: laser power, cutting speed, air pressure and focal point position. The aim of this work is to relate the cutting edge quality parameters namely: upper kerf (UK), lower kerf (LK), the ratio between upper to lower kerfs and the operating cost to the process parameters mentioned above. Mathematical models were developed to establish the relationship between the process parameters and the edge quality parameters, and special graphs were drawn for this purpose. Finally, a numerical optimization was performed to find out the optimal process setting at which both kerfs would lead to a ratio of about 1, and at which low cutting cost take place

Assessing institutional relations in development partnerships: the Land Development Corporation and the Hong Kong Government prior to 1997

This paper interprets and develops contemporary notions of partnership in relation to Hong Kong's Land Development Corporation. It demonstrates how such agencies are likely to become overdependent on their private-sector partners or ineffective in policy delivery, unless endowed with adequate powers and resources. In this context, it suggests that the LDC's capacity to promote urban renewal was undermined particularly by the institutional requirement to assemble redevelopment sites in multiple ownership principally through negotiation. While seeking to explain this weakness in relation to the socio-cultural context of Hong Kong, it warns that, in applying the Western experience of partnership elsewhere, full account must be taken of local circumstances and constraints

The Impact of a Boys and Girls Club Facility

This study partially replicates a study completed in 1992 of neighborhoods surrounding a new Boys and Girls Club facility on Route 40 in New Castle County, Delaware

No Wrong Door Client Satisfaction Survey

In March 1997, Delaware Health and Social Services (DHSS) initiated a services integration pilot project called "No Wrong Door" (NWD). Through a common screening and intake process, staff work with clients to identify needs and make appropriate referrals for services, regardless of the Division in which the services are offered. This process provides access to services from any point of entry and promotes a holistic approach to addressing the health and human service needs of Delaware's vulnerable families and individuals. NWD has been piloted at the Hudson State Service Center in Newark and at the Williams State Service Center and its satellite site, Carroll's Plaza, in Dover. All Department staff at those locations participate and new clients (as well as those whose eligibility is being re-determined) who visit those sites are offered the opportunity to go through the assessment interview and receive referrals to other services they might need

Urban policy

In one sense urban policy is no more than the cluster of public policy initiatives intended to have some sort of impact on the lives of urban residents. At a basic level, it is distinctive because it is targeted on territories or geographical areas rather than particular ‘client’ groups. However, such a definition is primarily descriptive and provides little help in assessing the impact of urban policy over time, because the targets (including the geographical areas) and nature of the initiatives keep changing, without the reasons for this ever quite being made explicit and without ‘lessons’ being learned. Nevertheless, there are important insights to be drawn from the study of urban policy. The ways in which its various strands and themes overlap and interweave at different times and in different places reflect and shape contemporary understandings of the city and its potential, as well as highlight the changing shapes of welfare and postwelfare states (neoliberalizing and beyond). Historically, the emphasis may have been on ‘inner cities’ and those living in them, but now it is urban economies that are to be revitalized or restructured in order to make cities competitive and improve the economic well-being of residents

Community Policing in Brookmont Farms: An Evaluation for the New Castle County Police Department, Vol 3: Perceptions of Residents

The purpose of this survey is to provide an opportunity for the residents of Brookmont Farms to express their views about crime, safety, community policing, and significant problems and needs in the Brookmont Farms neighborhood.Office of Community Oriented Policing Services, US Department of Justic

Josie galop /

Mode of access: Internet.From the Thomas A. Edison Collection of American Sheet Music