Body reactions during chain saw work were studied in 14 subjects. The subjects divided into three groups (control, sulpiride, and propranolol) successively cut down logs with a chain saw for seven minutes. The start of the sawing led to a pronounced increase in heart rate which persisted during the sawing. The groups taking sulpiride and propranolol showed a smaller increase in heart rate compa...

The article deals with possible estimates which would make the choice of the diamond wire sawing plant easier. Based on the principle law of friction of thin elastic bodies, the estimate procedure intended for the choice of a knew plant, and the estimate procedure for verification of the known plant were established. Orientation and detailed way of estimating the pulling force of the diamond wi...

Abstract The use of glued finger joint in green wood, directly from the sawing process, would open possibility to obtain timber small-sized achieving an efficient original raw material. gluing finger-jointed with moisture content above fibre saturation point, may improve efficiency and manufacturing process glulam or joinery. This be especially beneficial for a hardwood such as Eucalyptus globu...

Ultrasonic-assisted inner diameter machining is a slicing method for hard and brittle materials. During this process, the sawing force main factor affecting workpiece surface quality tool life. Therefore, based on indentation fracture mechanics, theoretical model of cutting an ultrasound-assisted saw established in paper improvement. The experiment was carried out with alumina ceramics (99%) as...

This study aimed to evaluate and better understand the mechanical crystalline responses of polycrystalline silicon sawn by diamond wire sawing. To simplify multi-wire sawing kinematic, an endless saw with a single looped welded was used. The cutting speed feed rate were varied in order characteristics surface morphology, roughness, subsurface damage. analysis brittle-ductile transition residual...

OBJECTIVE Repetitive training of simple upper limb movements is effective in stroke rehabilitation. For the repetitive training of complex movements, however, results are inconsistent. The aim of this study was to determine whether repetitive training of complex upper limb movements, focussing on strength and velocity as shaping elements, is effective in stroke rehabilitation. DESIGN Longitud...

Case hardening is a feature of dried wood that causes the wood to deform (cup) after re-sawing and equalising the moisture content. VTT has analysed case hardening with the aid of the simulation model PEO and with experimental drying, conditioning and storage tests. Case hardening cannot be predicted by the moisture content gradient alone. However, the case hardening gap after drying to a high ...

The objective of this work was to evaluate the effect impregnation process pine wood (Pinus sylvestris L.) on roughness parameters surface processed a frame sawing. samples were dried and impregnated using commercial procedure by local company. touch method with use measuring stylus (pin) employed determine considering parameters, namely, arithmetical mean value (Ra), total height profile (Rt),...

Billions of light emitting diodes LEDs are used today in traffic control, automotive headlights, flat panel display technology, mobile devices, back lighting, projection, and general illumination applications. With the dramatic growth in LEDs, manufacturers are looking for technologies to increase production yield and decrease cost. Sapphire wafer singulation into miniature dies is one of the c...