conclusions the layout of whiteboard in classrooms can be effective in causing student’s neck pain. in this study, the suitable height of installation of whiteboard was determined and it is recommended to be used in classrooms. background the mismatch between equipments and anthropometric dimensions of users is one of the issues that can be effective on development of musculoskeletal disorders ...

the conservation system is one of the proper methods avoiding the loss of nutrients, soil erosion, and reduce production costs. this research was examined for studying the influences of tillage systems on the three cotton cultivars at karkandeh and hashm-abad stations in gorgan. the experiments were conducted in a randomized completely block design as split plot with three replications with fiv...

the growing importance of the environmental and social policies in the spanish savings banksand the large differences between them, take us to delve into those factors that influence on the amounts spent on environment and welfare fund.in this line, we have analyzed all the spanish savings banks, over the period 2004-2008 and using the methodology of panel data, the effect that the composition ...

the growing importance of the environmental and social policies in the spanish savings banksand the large differences between them, take us to delve into those factors that influence on the amounts spent on environment and welfare fund.in this line, we have analyzed all the spanish savings banks, over the period 2004-2008 and using the methodology of panel data, the effect that the composition ...

The objective of this study was to manufacture new biodegradable fiberboards by thermo-pressing. The starting material was deoiled cake (only 0.9% oil content), generated during the biorefinery of sunflower (Helianthus annuus L.) whole plant in a co-rotating twin-screw extruder. All fiberboards were cohesive mixtures of proteins and lignocellulosic fibers, acting respectively as binder and rein...

Board-level package is a complicated multi-components structure. It can be simulated by an equivalent Finite Element Analysis (FEA) model of the board-level package, in which detailed layer structure of the Print Circuit Board (PCB), signal wires and through-holes were ignored. For this purpose, it is necessary to obtain the equivalent material properties of the board-level package. In this wor...

This paper gives an overview of basic principles of the thermal management in high density power converters. Methods for heat removal on a device and circuit board level are discussed. New packaging technologies for discrete power semiconductors as well as multifunctional board integration techniques are included. A view is given on future 3D integration techniques that take into account the po...