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LJItrasensitive H2S gas sensors based on p-type WS2 hybrid materials

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Nano Research 2018年第8期11卷 4215-4224页

作者： Georgies Alene Asrest Jose J. Baldovi Aron Dombovari Topias Jarvinen Gabriela Simone Lorite Melinda Mohl Andrey Shchukarev Alejandro Perez Paz Lede Xian jyri-pekka mikkola Anita Lloyd Spetz Heli Jantunen Angel Rubio Krisztian Kordas Microelectronics Research Unit Faculty of Information Technology and Electrical Engineering University of Oulu P.O. Box 4S00FI-90014 Oulu Finland Max Planck Institute for the Structure and Dynamics of Matter Luruper Chaussee 149 22761 Hamburg Germany Nano-Bio Spectroscopy Group European Theoretical Spectroscopy Facifity (ETSF) Universidad del Pals Vasco CFM SCIC-UPV/EHU-MPC DIPC A venida Tolosa 72 20018 San Sebastian Spain Technical Chemistry Department of Chemistry Chemical-Biological Centre Umea University SE-90187 Umea Sweden School of Chemical Sciences and Engineering School of Physics and Nanotechnology Yachay Tech University Urcuquf Ecuador Industrial Chemistry & Reaction Engineering Department of Chemical Engineering Johan Gadolin Process Chemistry Centre AboAkademi University FI-20500 Abo-Turku Finland Sensor and Actuator Systems Department of Physics Chemistry and Biology Link~ping University SE-58183 LinkOping Sweden

Owing to their higher intrinsic electrical conductivity and chemical stability with respect to their oxide counterparts, nanostructured metal sulfides are expected to revive materials for resistive chemical sensor applications. Herein, we explore the gas sensing behavior of WS2 nanowire-nanoflake hybrid materials and demonstrate their excellent sensitivity （0.043 ppm-1） as well as high selectivity towards H2S relative to CO, NH~, H2, and NO （with corresponding sensitivities of 0.002, 0.0074, 0.0002, and 0.0046 pprn-1, respectively）. Gas response measurements, complemented with the results of X-ray photoelectron spectroscopy analysis and first-principles calculations based on density functional theory, suggest that the intrinsic electronic properties of pristine WS2 alone are not sufficient to explain the observed high sensitivity towards H2S. A major role in this behavior is also played by O doping in the S sites of the WS2 lattice. The results of the present study open up new avenues for the use of transition metal disulfide nanomaterials as effective alternatives to metal oxides in future applications for industrial process control, security, and health and environmental safety.

关键词： ws nanowire nanoflake gas sensor H2S,O doping

Ionic Liquid Assisted Extraction of Nitrogen and Sulphur-Containing Air Pollutants from Model Oil and Regeneration of the Spent Ionic Liquid

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Journal of Environmental Protection 2011年第6期2卷 796-802页

作者： Ikenna Anugwom Paivi Maki-Arvela Tapio Salmi jyri-pekka mikkola Industrial Chemistry and Reaction Engineering Process Chemistry CentreAbo Akademi UniversityTurkuFinland Technical Chemistry Department of ChemistryChemical-Biological CenterUmea UniversityUmeaSweden

Removal of air pollutants, such as nitrogen and sulphur containing compounds from a model oil (dodecane) was studied. An ionic liquid (1-ethyl-3-methylimidazolium chloride [C2mim] [Cl]) was used as an extractant. Liquid-liquid extraction by using 1-ethyl-3-methylimidazolium chloride [C2mim] [Cl] was found to be a very promising method for the removal of N- and S-compounds. This was evaluated by using a model oil (dodecane) with indole as a neutral nitrogen compound and pyridine as a basic nitrogen compound. Dibenzothiophene (DBT) was used as a sulphur compound. An extraction capacity of up to 90 wt% was achieved for the model oil containing pyridine, while only 76 wt% of indole in the oil was extracted. The extraction capacity of a model sulphur compound DBT was found to be up to 99 wt%. Regeneration of the spent ionic liquid was carried out with toluene back-extraction. A 1:1 toluene-to-IL wt ratio was performed at room temperature. It was observed that, for the spent ionic liquid containing DBT as a model compound more than 85 wt% (corresponding 3852 mg/kg) could be removed from the oil. After the second regeneration cycle, 86 wt% of the DBT was recovered from the ionic liquid to toluene. In the case of indole as the nitrogen containing species, more than 99 wt%, (corresponding to 2993 mg/kg) of the original indole was transferred from the model oil to the ionic liquid. After the first-regeneration cycle of the spent ionic liquid, 54 wt% of the indole–in-IL was transferred to toluene. Thus, both extractions of nitrogen and sulphur model compounds were successfully carried out from model oil and the back-extraction of these compounds from the ionic liquids to toluene demonstrated the proved the concept of the regeneration point of view.

关键词： Ionic Liquids Extraction Air Pollutants Nitrogen Compound Sulfur Compounds

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库奥皮奥城市剧院芬兰库奥皮奥

世界建筑导报 2024年第2期39卷 110-113页

作者： Juho Grönholm Antti Nousjoki Janne Teräsvirta Samuli Woolston Heikki Riitahuhta Toni Laurila pekka Sivula jyri Tartia Auvo Lindroos Harri Ahokas Petra Grisova Vladimir Ilic Lotta Kindberg Santtu Hyvärinen Gerard Gutierrez Tuomas Uusheimo(摄影) ALA建筑师事务所不详

现在的库奥皮奥城市剧院是建筑师赫尔默•斯丹露丝和Risto-Veikko Luukkonen在20世纪60年代的现代主义建筑。扩建包括一个新的200座演播舞台,具有灵活的座位和舞台机械。新的空间还提供装载和物流、服装生产和存储,以及新舞台的支持功能... 详细信息

现在的库奥皮奥城市剧院是建筑师赫尔默•斯丹露丝和Risto-Veikko Luukkonen在20世纪60年代的现代主义建筑。扩建包括一个新的200座演播舞台,具有灵活的座位和舞台机械。新的空间还提供装载和物流、服装生产和存储,以及新舞台的支持功能。从市中心接近剧院时,唯一可见的变化是4米高的剧院塔楼。主舞台的舞台技术将全面更新,因此必须增加当前塔楼的高度。附加组件可形成一个发光的玻璃灯箱,使旧塔的独特形状易于辨认。

关键词：现代主义建筑主舞台舞台机械服装生产塔楼剧院

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校园城市村落芬兰埃斯波

世界建筑导报 2024年第2期39卷 104-105页

作者： Juho Grönholm Antti Nousjoki Janne Teräsvirta Samuli Woolston Willem Barendregt Vladimir Ilic Julius Kekoni Auvo Lindroos Aleksi Niemeläinen pekka Sivula pekka Tainio Jussi Vuori Haley Zhou ErikaÖsterlund ALA建筑师事务所

ALA建筑师事务所在阿尔托大学的2015校园国际设计竞赛中提出了“大型联合建筑群——活动孵化器”的理念。他们的目标是连接现有的结构和项目,创建一个新的区域热点,一个充满街道生活气息的城市集中区,促进创造力的展示。

关键词：建筑师事务所国际设计竞赛孵化器创造力生活气息阿尔托大学校园集中区

Sub-Terahertz Channel Sounder: Review and Future Challenges

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China Communications 2023年第6期20卷 26-48页

作者： Yejian Lyu pekka Kyosti Wei Fan Deparment of Electronic Systems Aalborg UniversityAalborg Ost 9220Denmark Center for Wireless Communication-Radio Technology(CWC-RT) Oulu UniversityOulu 90570Finland Keysight Technologies Finland Oy Oulu 90630Finland

Due to the large amount of unused and unexplored spectrum resources, the so-called subTerahertz(sub-THz) frequency bands from 100 to 300 GHz are seen as promising bands for the next generation of wireless communication systems. Channel modeling at sub-THz bands is essential for the design and deployment of future wireless communication systems. Channel measurement is a widely adopted method to obtain channel characteristics and establish mathematical channel models. Channel measurements depend on the design and construction of channel sounders. Thus, reliable channel sounding techniques and accurate channel measurements are required. In this paper, the requirements of an ideal channel sounder are discussed and the main channel sounding techniques are described for the subTHz frequency bands. The state-of-the-art sub-THz channel sounders reported in the literature and respective channel measurements are presented. Moreover, a vector network analyzer(VNA) based channel sounder, which supports frequency bands from 220 to330 GHz is presented and its performance capability and limitation are evaluated. This paper also discussed the challenge and future outlook of the sub-THz channel sounders and measurements.

关键词： radio propagation beyond 5G communication sub-terahertz channel sounding techniques

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阶梯停车场芬兰郝尔辛基

世界建筑导报 2024年第2期39卷 117-119页

作者： uho Grönholm Antti Nousjoki Samuli Woolston pekka Tainio Tuulikki Tanska Rachel Murray Anssi Luodemäki Harri Humppi Tuomas Uusheimo(摄影) Marc Goodwin(摄影) ALA建筑师事务所不详

新的五角形、五层高的Saukonlaituri停车设施包括六条流线,可停放600辆私家车,中央庭院被布满巨石、苔藓和蕨类植物的景观环绕。其中五个停车场有顶棚,第六个停车场位于屋顶。庭院具有双重功能:它既是一个采光井,阳光可通过庭院照射到... 详细信息

新的五角形、五层高的Saukonlaituri停车设施包括六条流线,可停放600辆私家车,中央庭院被布满巨石、苔藓和蕨类植物的景观环绕。其中五个停车场有顶棚,第六个停车场位于屋顶。庭院具有双重功能:它既是一个采光井,阳光可通过庭院照射到较低的停车场,又是雨水蓄水池和积雪堆积地。建筑的南侧从入口广场后退,将地面公共空间延伸为阶梯式公园,一直延伸到屋顶。这种解决方案使周围公寓楼的居民可以沿着阶梯走到正确的楼层取车,而不是乘坐电梯。阶梯区域也可以用于野餐和日光浴。

关键词：入口广场空间延伸采光井停车设施公寓楼停车场阶梯式电梯

The Participation Experiences of Chinese Teacher Trainees and Their Finnish Teacher Trainer on an In-Service Teacher Training Program Exported From Finland to China

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ECNU Review of Education 2023年第3期6卷 385-409页

作者：彭素豪 Ritva Kantelinen pekka Räihä University of Eastern Finland Tampere University

Purpose:This paper aims to examine the participation experiences of a sample of Chinese teacher trainees and their Finnish teacher trainer on an in-service teacher training program exported from Finland to Beijing,***/Approach/Methods:Six science teachers from Beijing and their Finnish teacher trainer participated in semi-structured *** the ideological perspective of international education,a total of eight semi-structured interviews were analyzed through qualitative content ***:The results show that all interviewees were highly motivated to learn from the Other's education system and *** participants benefited from a broader understanding of the Self's and the Other's education systems,while others did *** interviewees also described some participation challenges,such as language barriers and practices that adapted learner-centered teaching approaches in Beijing ***,the interviewees mentioned future expectations of more in-depth communication between Finland and ***/Value:Some recommendations for better training outcomes,improving the quality of participation experiences,and reaching more mutual understandings were discussed at the end of this study.

关键词： Education export in-service teacher training internationalization Sino-Finnish teacher education teacher professional development

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拉彭兰塔城市剧院芬兰拉彭兰塔

世界建筑导报 2024年第2期39卷 114-116页

作者： Juho Grönholm Antti Nousjoki Janne Teräsvirta Samuli Woolston Harri Ahokas Tiina Liisa Juuti Julius Kekoni Auvo Lindroos Niklas Mahlberg Marlène Oberli-Räihä pekka Sivula Tuomas Uusheimo(摄影) ALA建筑师事务所不详

拉彭兰塔城市剧院的概念与众不同:剧院建在一个购物中心的顶层。然而,这个概念很古老,这也是剧院回归本源、回归市场、回归公众的原因。购物中心每年有数百万客流,这些人可以欣赏各种戏剧,然后在餐厅用餐休息或下榻酒店。门厅采用平静... 详细信息

拉彭兰塔城市剧院的概念与众不同:剧院建在一个购物中心的顶层。然而,这个概念很古老,这也是剧院回归本源、回归市场、回归公众的原因。购物中心每年有数百万客流,这些人可以欣赏各种戏剧,然后在餐厅用餐休息或下榻酒店。门厅采用平静的单色氛围,与购物中心繁忙的明亮色彩形成对比。一块几乎透明的波浪形金属丝网帘将门厅与下方的购物中心分隔开来。楼梯从拱廊通向剧院门厅,观众穿过巨大的白色楼梯后抵达剧院。

关键词：购物中心金属丝网波浪形塔城市楼梯剧院回归

Spatial fading channel emulation for over-the-air testing ofmillimeter-wave radios:concepts and experimental validations

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Frontiers of Information Technology & Electronic Engineering 2021年第4期22卷 548-559页

作者： Wei FAN Lassi HENTILA pekka KYOTI Antenna Propagation and Millimeter-wave Systems(APMS)Section Department of Electronic SystemsAalborg UniversityAalborg 9220Denmark Keysight Technologies Finland Oy Oulu 90014Finland Centre for Wireless Communications University of OuluOulu 90014Finland

Millimeter-wave(mmWave)communication is regarded as the key enabling component for fifth-generation(5G)cellular systems due to the large available spectrum *** make mmWave new radio(NR)a reality,tremendous efforts have been exerted from the industry and *** evaluation of mmWave NR is a mandatory step and the key to ensuring the success of mmWave 5G ***-the-air(OTA)radiated method of testing mmWave NR in laboratory conditions is highly attractive,since it facilitates virtual field testing of mmWave devices in realistic propagation *** this paper,we first discuss the need for and challenges in OTA measurement of mmWave 5G NR under fading channel *** that,two promising candidate solutions,i.e.,wireless cable and multi-probe anechoic chamber(MPAC),are *** principles,applicability for mmWave NR,and main challenges are ***,preliminary experimental validation results in a frequency range 2 anechoic chamber are demonstrated for the wireless cable and MPAC methods at 28 GHz.

关键词： Spatial channel model Over-the-air(OTA)testing Wireless cable method Multi-probe anechoic chamber(MPAC)method FR2 validation