Laser scanner for biological defects in wood products

1983 ◽  
Author(s):  
Jon F. Soest ◽  
E. A. Olmstead ◽  
P. C. Matthews
Keyword(s):  
Laser Scanner ◽  
Wood Products ◽  
Biological Defects

Evaluation of geometrical benchmark artifacts containing multiple overhang lengths fabricated using material extrusion technique

2020 ◽  
Vol 14 (3) ◽  
pp. 7296-7308
Author(s):  
Siti Nur Humaira Mazlan ◽  
Aini Zuhra Abdul Kadir ◽  
N. H. A. Ngadiman ◽  
M.R. Alkahari
Keyword(s):  
3D Model ◽  
Laser Scanner ◽  
Dimensional Accuracy ◽  
Fused Deposition Modelling ◽  
Layer By Layer ◽  
Fused Deposition ◽  
Layer Technique ◽  
Subtractive Manufacturing ◽  
Manufacturing Features ◽  
Layer Problem

Fused deposition modelling (FDM) is a process of joining materials based on material entrusion technique to produce objects from 3D model using layer-by-layer technique as opposed to subtractive manufacturing. However, many challenges arise in the FDM-printed part such as warping, first layer problem and elephant food that was led to an error in dimensional accuracy of the printed parts especially for the overhanging parts. Hence, in order to investigate the manufacturability of the FDM printed part, various geometrical and manufacturing features were developed using the benchmarking artifacts. Therefore, in this study, new benchmarking artifacts containing multiple overhang lengths were proposed. After the benchmarking artifacts were developed, each of the features were inspected using 3D laser scanner to measure the dimensional accuracy and tolerances. Based on 3D scanned parts, 80% of the fabricated parts were fabricated within ±0.5 mm of dimensional accuracy as compared with the CAD data. In addition, the multiple overhang lengths were also successfully fabricated with a very significant of filament sagging observed.

Residential tornado safe room from commodity wood products – impact and wind pressure testing

2018 ◽  
Author(s):  
Robert H. Falk ◽  
James J. Bridwell ◽  
C. Adam Senalik ◽  
Marshall Begel
Keyword(s):  
Wood Products ◽  
Wind Pressure ◽  
Pressure Testing

INVESTIGATIONS OF THE BALTIC SEA COASTAL ZONE ABOVE-WATER PART TOPOGRAPHY DYNAMICS BY MEANS OF TERRESTRIAL LASER SCANNER (SVETLOGORSK CITY, KALININGRAD REGION)

2017 ◽  
Author(s):  
Nikolay Lugovoy ◽  
Nikolay Lugovoy ◽  
Askar Ilyasov ◽  
Askar Ilyasov ◽  
Elena Pronina ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Coastal Zone ◽  
Coastal Erosion ◽  
Laser Scanner ◽  
Terrestrial Laser Scanner ◽  
The Baltic Sea ◽  
Coastal Dynamics ◽  
Kaliningrad Region ◽  
The Baltic

The paper describes application of the terrestrial laser scanner for investigation of coastal dynamics of the Svetlogorskaya Bay, Baltic Sea. Methods of investigation and results of surveys repeated over the two consecutive years for quantification of coastal erosion and slope processes within the coastal zone are presented.

Der Spielraum bei der Vermarktung von Waldleistungen ist eingeschränkt (Essay) | The scope for the commercialization of forest services is limited (essay)

2009 ◽  
Vol 160 (8) ◽  
pp. 228-231
Author(s):  
Hansruedi Walther
Keyword(s):  
Private Property ◽  
Legal Framework ◽  
Third Parties ◽  
Wood Products ◽  
Forest Owner ◽  
Free Access ◽  
School Class ◽  
Market Niche ◽  
The Right ◽  
Exclusive Right

A forest owner can only commercialize non-wood products and services within a tightly restricted market niche. On account of free access being permitted to the forest it is impossible to deny to third parties the consumption of many non-wood products and services: everybody has the right to be in the forest for recreation. As a result many non-wood services cannot be commercialized by the forest owner, or not exclusively. What would seem unthinkable elsewhere on private property seems to be taken for granted in the forest: third parties may take products from the forest and even sell them without being the forest owners. For certain nonwood services or products, such as the installation of rope parks or for burial in the forest, the organizer must conclude an agreement with the forest owner or draw up a contract for servitude or benefit. In addition, for these activities a permit from the Forestry Department is necessary. On the other hand, for an itinerant school class or for the production of forest honey neither a binding regulation with the forest owner nor a permit from the Forestry service is necessary, provided that no constructions are erected in the forest. The only exclusive right which remains to the forest owner, besides the sale of his property, is the exploitation of his trees within the legal framework.

Senkenanrechnung gemäss Kyoto-Protokoll: Perspektiven für die Waldwirtschaft | Taking carbon sinks into account according to the Kyoto Protocol: a prospect for the forest sector

2008 ◽  
Vol 159 (9) ◽  
pp. 296-302
Author(s):  
Richard Volz
Keyword(s):  
Kyoto Protocol ◽  
Emissions Trading ◽  
Wood Products ◽  
Forest Sector ◽  
Carbon Sinks ◽  
Forest Owners ◽  
Trading Market ◽  
Reduce Emissions ◽  
Emission Reduction Target ◽  
Actual Target

The Kyoto Protocol makes provisions for carbon sinks from forest management to be taken into account as a contribution towards fulfilling a country's emission reduction target. Additional emission allowances are allocated for these forest carbon sinks. If Switzerland uses this extra contingent of allowances to the full it would then only have to reduce emissions by 4.5% instead of the actual target of 8%. Emission allowances from carbon sinks can be traded on the emissions trading market and be claimed by forest owners. An assessment of the income that could be anticipated was carried out in four forestry companies: with the CO2 price set at 10 CHF per ton it was seen that a potential revenue of between 6 and 71 CHF per hectare and year could be realised. However, the legal basis for allocating emission allowances from carbon sinks to forest owners has yet to be created. In view of the fact that the two chambers of Parliament refused the introduction of the Forests Act Revision Bill, it is not clear if and in what form this will be done. For the period after 2012, the rules will be renegotiated at the international level and it is expected that the carbon stored in harvested wood products will be taken into account. Accordingly, wood removed from the forest would no longer be automatically counted as a CO2 source in the emission balance.

Results of studying the dimensional accuracy of the bases of complete removable prostheses made using 3D printing and traditional technologies

2020 ◽  
pp. 34-39
Author(s):  
Vokulova Yu.A. Vokulova ◽  
E.N. Zhulev
Keyword(s):  
3D Printing ◽  
Traditional Method ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Digital Technologies ◽  
Dimensional Accuracy ◽  
3D Printer ◽  
Significance Level ◽  
Average Value ◽  
The Difference

This article presents the results of studying the dimensional accuracy of the bases of complete removable prostheses made using a 3D printer and the traditional method. Bases of complete removable prostheses were made using an intraoral laser scanner iTero Cadent (USA) and a 3D printer Asiga Max UV (Australia). To study the dimensional accuracy of the bases of complete removable prostheses, we used the DentalCAD 2.2 Valletta software. The Nonparametric Wilcoxon W-test was used for statistical analysis of the obtained data. We found that the average value of the difference with the standard for bases made using digital technologies is 0.08744±0.0484 mm. The average value of the difference with the standard for bases made by the traditional method is 0.5654±0.1611 mm. Based on these data, we concluded that the bases of complete removable prostheses made using modern digital technologies (intraoral laser scanning and 3D printer) have a higher dimensional accuracy compared to the bases of complete removable prostheses made using the traditional method with a significance level of p<0.05 (Wilcoxon's W-test=0, p=0.031). Keywords: digital technologies in dentistry, digital impressions, intraoral scanner, 3D printing, ExoCAD, complete removable dentures.

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