Riveting tasks in aircraft manufacturing results in exposure to vibration from both rivet guns and bucking bars. Long term exposure to vibration has been associated with symptoms of vibration white finger and musculoskeletal disorders. Four different bucking bars of the same shape but different material and mass characteristics (90% tungsten, >90% tungsten, cold rolled and stainless steel) were...

Modern harvesters are equipped with measurement and bucking optimization systems able not only to continuously measure the length and diameter of the stem but also to predict the profile of the unknown part of a stem and to calculate the optimal cross-cutting points for the whole stem. So far, tree-bucking optimization in the Nordic countries has been efficiently applied only with spruce becaus...

In this paper, we develop a Mixed Integer Linear model for a practical multi-facility wood procurement-planning problem using a cut-to-length (CTL) bucking system. This forest management problem is difficult to solve since it integrates the forest bucking problem and the multi-facility supply planning problem. A priority list approach was used to generate adequate bucking patterns for the Easte...

An optimal tree-stem bucking system was developed for central Appalachian hardwood species using 3D modeling techniques. ActiveX Data Objects were implemented via MS Visual C++/OpenGL to manipulate tree data which were supported by a backend relational data model with five data tables for stems, grades and prices, logs, defects and stem shapes. Network analysis algorithm was employed to achieve...

We consider a two-echelon timber supply chain in which the first echelon consists of several stands to be harvested and the second echelon consists of mills to be procured with logs of different length. This problem aims at minimizing harvesting and transportation costs for one production period, while satisfying demand expressed as mix of volumes of specific log types. Harvesting cost, which i...

EPA’s research-based regulations have fostered significant strides in environmental improvement in the United States and inspired analogous endeavors around the globe. Notably, air quality has improved (https://gispub.epa.gov/air/trendsreport/2017/#highlights) over North America and Europe in recent decades, and China and India are making concerted efforts to protect the health of their citizen...

-Usin a d u n ~ m y test driverwit11 ;i sirn~rlatecl Naccid fi>rear.rn c;rp;rble of representing either a large or zem frictiioi~ colldition, S I X powered wheelchairs were examined fc>i,r buckir~g tendencies. In the zero friction conclition, brrcking was easily inducecl in 5 of 6 testcd wheelchairs. Addillg ltiction to the simulatccl fc>rear-m prevented bucking in ;ill lestecl wheelchairs but ...

This paper compares the effects of exposure to exogenous melatonin (MEL), short days (SD, 8h of light) and long days (LD, 16 h of light), on reproductive activity, sperm motility and other reproductive variables, in Blanca Andaluza bucks. Fourteen males were spilt into two groups of seven animals (G1 and G2). They were subjected to five alternations of 2 months of LD followed by 2 months of SD ...

Cross-cutting of a tree into set assortments (»bucking pattern«) presents large potential for optimizing the volume and value recovery; therefore, bucking pattern optimization has been studied extensively in past. However, it not seen widespread adoption chainsaw bucking, where time consuming costly manual measurement input parameters is required taper curve estimation. The present study invest...