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| 1 | Numerical and Experimental Modelling of Gas Flow and Heat Transfer in the Air Gap of an Electric Machine. Part II: Grooved Surfaces显示文摘The study deals with the cooling of a high-speed electric machine through an air gap with numerical and experimental methods. The rotation speed of the test machine is between 5000-4000 r/rain and the machine is cooled by a forced gas flow through the air gap. In the previous part of the research the friction coefficient was measured for smooth and grooved stator cases with a smooth rotor. The heat transfer coefficient was recently calculated by a numerical method and measured for a smooth stator-rotor combination. In this report the cases with axial groove slots at the stator and/or rotor surfaces are studied. Numerical flow simulations and measurements have been done for the test machine dimensions at a large velocity range. At constant mass flow rate the heat transfer coefficients by the numerical method attain bigger values with groove slots on the stator or rotor surfaces. The results by the numerical method have been confirmed with measurements. The RdF-sensor was glued to the stator and rotor surfaces to measure the heat flux through the surface, as well as the temperature. | Maunu KUOSA Petri SALLINEN Arttu REUNANEN Jari BACKMAN Jaakko LARJOLA Lasse KOSKELAINEN | 2005 | Journal of Thermal Science2005，14，1： | 4 |
| 2 | Computational and Experimental Study of an Industrial Centrifugal Compressor Volute显示文摘A centrifugal compressor with a vaneless diffuser was studied experimentally and numerically. The main target of the study was to analyze the volute flow. Two different volute geometries was studied. The numerical solution was done by using a steady-state RANS code at both design and off-design conditions. Both calculated and measured pressure and velocity distributions are presented. | Harri Pitkanen Haunu Esa Arttu Reunanen Petri Sallinen Jaakko Larjola | 2000 | Journal of Thermal Science2000，9，1： | 3 |
| 3 | 2D combined finite-discrete element method to model multi-fracture of beam structures 显示文摘 | Paavilainen Jani Tuhkuri Jukka Polojarvi Arttu | 2009 | Engineering Computations2009，26，6： | 1 |
| 4 | Radial Forces in a Centrifugal Compressor; Experimental Investigation by Using Magnetic Bearings and Static Pressure Distribution显示文摘The volute of a centrifugal compressor causes a non-uniform pressure distribution which leads to a radial force on the impeller. This force was measured using magnetic bearings. In addition, the radial force was estimated using the static pressure distribution measured at the impeller outlet. The impeller force was found to be the highest at choke, the lowest at the design flow and moderate at stall. The radial force determined from the pressure measurements was only slightly different from the force obtained from the bearing measurements. The rotational speed was seen to affect the force to some extent. | Arttu REUNANEN Jaakko LARJOLA | 2005 | Journal of Thermal Science2005，14，1： | 1 |
| 5 | Value of albumin dialysis therapy in severe liver insufficiency显示文摘 | Arttu Lahdenper? Anna-Maria Koivusalo Anne Vakkuri Krister H?ckerstedt Helena Isoniemi | 2005 | Transplant International2005，，11： | 1 |
| 6 | Dietary Phosphate Binding and Loading Alter Kidney Angiotensin-Converting Enzyme mRNA and Protein Content in 5/6 Nephrectomized Rats显示文摘 | Er?ranta Arttu Riutta Asko Fan Meng Koskela Jenni Tikkanen Ilkka Lakkisto P?ivi Niemel? Onni Parkkinen Jyrki Mustonen Jukka P?rsti Ilkka | 2012 | American Journal of Nephrology2012，，5： | 1 |
| 7 | Opportunities for mesoscopics in thermometry and refrigeration显示文摘 | Francesco Giazotto Tero T Heikkil(a) Arttu Luukanen | 2006 | Reviews of Modern Physics2006，78，： | 1 |
| 8 | Passive UHF RFID in paper industry:challenges,benefits and the application environment 显示文摘 | Arttu L Jussi N | 2009 | IEEE Transactions on Automation and Engineering2009，6，1： | 1 |
| 9 | Value of albumin dialysis therapy in severe liver insufficiency显示文摘 | ARTTU LAHDENPERA ANNA-MARIA KOIVUSALO ANNE VAKKURI | 2005 | Transplantation International2005，17，： | 1 |
| 10 | 赫尔辛基万塔国际机场 芬兰万塔显示文摘赫尔辛基万塔国际机场是芬兰的主要机场和北欧领先的长途机场,现每年有1900万乘客。由于其合理的功能配置,地域化的设计表达,该机场连续多年被评为世界顶级机场之一。PES在这个机场项目的设计工作始于1987年,自此以后参与了其30年间的历次扩建,设计范围涵盖航站楼,飞行控制塔,商业及酒店设施等。到2020年初航站楼面积将超过25万平方米,客流量达到每年3000万。 | 无 佩卡·萨米宁 Tuomas Silvennoinen Arttu Suomalainen Kari Palsila(摄影) Jussi Tiainen(摄影) | 2021 | 世界建筑导报2021，36，1： | 0 |
| 11 | KEHÄRATA环线铁路站点 芬兰万塔显示文摘PES建筑设计事务所负责设计Aviapolis站、机场站、Ruskeasanta站和Viinikkala站等地下站点,所涉及的内容包含每个站的月台、出口通道、急救逃生路线和辅助竖井以及地面出入口建筑和后勤建筑。车站入口沿着连接T1和T2航站楼的走廊布置。长达70米的扶梯长廊将旅客送达地下站台,通过Tietotie的入口可进入围绕机场的办公空间。设计采用地域化的设计语言与材料元素,在数十米深的地下也为到达的旅客提供一个清晰明了的城市印象及艺术空间。 | Arttu Suomalainen Kari Palsila(摄影) Marc Goodwin(摄影) | 2021 | 世界建筑导报2021，36，1： | 0 |
| 12 | Physics-based electrical modelling of CIGS thin-film photovoltaic modules for system-level energy yield simulations显示文摘Copper indium gallium selenide(CIGS)is a commercialized,high-efficiency thin-film photovoltaic(PV)technology.The state-of-theart energy yield models for this technology have a significant normalized root mean square error(nRMSE)on power estimation:De Soto model—26.7%;PVsyst model—12%.In this work,we propose a physics-based electrical model for CIGS technology which can be used for system-level energy yield simulations by people across the PV value chain.The model was developed by considering models of significant electrical current pathways from literature and adapting it for the system-level simulation.We improved it further by incorporating temperature and irradiance dependence of parameters through characterisation at various operating conditions.We also devised a module level,non-destructive characterization strategy based on readily available measurement equipment to obtain the model parameters.The model was validated using the measurements from multiple commercial modules and has a significantly lower power estimation nRMSE of 1.2%. | Santhosh Ramesh Arttu Tuomiranta Ali Hajjiah Marc Meuris Bart Vermang Jef Poortmans | 2022 | npj Flexible Electronics2022，6，1： | 0 |
| 13 | Structural and chemical changes in pyrogenic organic matter aged in a boreal forest soil显示文摘Pyrogenic organic matter(PyOM)is formed during wildfires and prescribed burnings or produced intentionally in the form of biochar for soil amendment purposes.It is attracting a growing scientific and practical interest due to its important role in the global carbon cycle and agronomic applications as a soil enhancer.Most of the studies on the physicochemical properties of PyOM have been conducted using fresh biochars even though the characteristics of PyOM are expected to alter due to aging processes in soil environment.In this paper,we report the results of a study that utilized X-ray microtomography and elemental analysis to investigate the chemical and structural changes in the PyOM formed during prescribed burning events and aged thereafter for 1–71 years in a boreal forest soil.Our results indicate that changes in elemental composition occurred at decadal timescales,and an apparent steady state was reached ca.30 years after PyOM formation and exposure to the environment.At such timescales,PyOM was able to retain its porous structure originating from the cellular structure of the initial wood tissues.However,structural analysis revealed several effects of aging on the pore structure,such as the formation of surface coating layers,pore fillings,and fractures.These changes may alter pore size distribution and accessibility of the pores and further alter the influence of PyOM on soil functions,such as the transfer and retention of water and nutrients in PyOM pores. | Jari HYVÄLUOMA Arttu MIETTINEN Riikka KESKINEN Kimmo RASA Henrik LINDBERG | 2023 | Pedosphere2023，33，3： | 0 |
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