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Vantaa, Finland

Pöyry is a global consulting and engineering firm focusing on the energy, forest industry and infrastructure and environment sectors. It focuses on power generation, transmission and distribution, forest industry, chemicals and biorefining, mining and metals, transportation, water and real estate sectors. It changed its name from Jaakko Pöyry Group in 2006. The company is listed on the Helsinki Stock Exchange and is headquartered in Vantaa, Finland.The company was founded by Jaakko Pöyry who spearheaded its growth from a small engineering office to a global corporation in his special field of interest, the forest products industry.In 2012, Pöyry was hired as a consultant on the controversial Xayaburi Dam on the Mekong River in Laos. Wikipedia.

Lan H.,University of Alberta | Martin C.D.,University of Alberta | Andersson J.C.,Poyry
Rock Mechanics and Rock Engineering | Year: 2013

To understand and predict the in situ brittle rock mass damage process induced by a coupled thermo-mechanical loading, the knowledge of rock mass yielding strength, scaling relationship between laboratory and in situ and microstructure characterization is required. Difficulties have been recognized due to the seldom availability of in situ experiment and appropriate numerical methodologies. The Äspö Pillar Stability Experiment was used to monitor the evolution of rock mass damage in a pillar of rock separating two 1.75-m diameter vertical boreholes. The loading of the pillar was controlled using the in situ stresses, excavation geometry, and locally increasing the rock temperature. The induced loading resulted in a complex discontinuum process that involved fracture initiation, propagation, interaction and buckling, all dominated by a tensile mechanism. Tracking this damage process was carried out in two steps. Initially, a three-dimensional numerical model was used to generate the stresses from the excavation geometry and thermal loading. The plane strain stresses, at selected locations where detailed displacement monitoring was available, were then used to track the evolution of damage caused by these induced stresses. The grain-based discrete element modeling approach described in Lan et al. (2010), which captures the grain scale heterogeneity of the rock, was used to establish the extent of damage. Good agreement was found between the predicted and measured temperatures and displacements. The grain-based model provided new insights into the progressive failure process. © 2012 Springer-Verlag. Source

Napoli C.D.,Poyry
Noise Control Engineering Journal | Year: 2011

The noise measurement case presented in this work took place inAugust 2007 in a small community located on the Finnish west coast, where an 1Ã1 MW pitch regulated variable speed wind turbine caused many complaints from the nearby holiday residents after its initial start-up in 2006. New specific receiver testing procedures were introduced prior to the test for performing just one overnight measurement under desired weather conditions. The goal was to test the sound power level and outdoor far field sound pressure levels at receiver point, including the verification of narrow band and impulsive sounds, during the night time and downwind conditions. © 2011 Institute of Noise Control Engineering. Source

Carmona J.,Poyry
Applied Thermal Engineering | Year: 2015

Evaporative cooling is widely recognised as one of the available gas turbine power augmentation tools. Due to its inherent characteristics evaporative cooling is thought as being only effective in geographic areas with high ambient air dry bulb temperature and low relative humidity. This paper clarifies, via literature review and thermal modelling examples, the fact that there is still potential for evaporative cooling in high temperature and relative humidity areas. The paper also estimates the maximum cost of the evaporative cooling installation that will yield a positive return of investment to plant owners in the decision of retrofitting evaporative cooling systems for the particular location of Lagos in Nigeria. In consequence power plant operators, especially those whose power generation assets are located on coastal environments, should be aware of the prospective benefits associated with such cooling technology. © 2015 Elsevier Ltd. All rights reserved. Source

Messerklinger S.,Poyry
Geotextiles and Geomembranes | Year: 2014

The right wing embankment of the headrace channel of a hydropower plant, failed adjacent to the concrete intake structure. The failure also caused damages of the penstocks and flooding of the powerhouse. The root-cause analysis showed that water from the reservoir entered, through an open joint in the adjacent concrete structure, the geomembrane lined homogeneous embankment dam fill. This seepage water had eroded dam material from below the geomembrane and transported it to the drainage zones located at the interface of the embankment and concrete structures. Due to continuing seepage and erosion of dam material the geomembrane ruptured and this resulted in the full reservoir head being applied to the embankment fill material. This increased the seepage through the dam fill and caused concentrated leak erosion of the fine-grained material at the contact with the concrete structure, and this lead to the failure of the embankment. © 2013 Published by Elsevier Ltd. Source

Kallioranta S.,Poyry
Paper360 | Year: 2013

Announcements of restructuring, consolidations and closures have become commonplace. Despite the grim headlines dominating the news, Printing & Writing paper is not vanishing. NewPage filed for Chapter 11 bankruptcy protection in 2011, after struggling for some time with lower demand for coated paper and rising raw material costs. It is no secret that the phenomenal growth of eReaders, tablets, and smartphones as a way for consumers to access information previously the domain of print media, has taken a heavy toll on the pulp and paper industry and is the single largest threat to Printing & Writing. As a result of these changes, the USPS is searching for ways to stem its losses. More than half of its distribution centers are under review, as is downgrading to five-day delivery and eliminating Saturday and next-day delivery for First Class. Source

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