109 research outputs found
Intern experience with Texas Utilities Services, Inc.: an internship report
Full text linkIncludes author's vita (leaf 78)"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesThis report is a review of the author's year of experience as an intern
with Texas Utilities Services...The author worked as a Nuclear Fuels Engineer for the duration
of the internship period. His primary assignment was the development of a system to facilitate
the financial accounting and materials accountability for nuclear fuel. This assignment
required the author to coordinate the design process with many people from different
disciplines. In addition, the author was responsible for performing financial and economic
analyses of the nuclear fuel cycle. This offered him the opportunity to evaluate the economic
impact of various engineering and financial decisions upon the nuclear fuel
cycle
Enzymatic Bromocyclization of α- and γ-Allenols by Chloroperoxidase from Curvularia inaequalis
Full text link| openaire: EC/H2020/865885/EU//ABIONYS Funding Information: We gratefully acknowledge financial support by the European Research Council (ABIONYS, 865885, J. D.), the Academy of Finland (grant numbers 298350 & 324976, J. D.), the NATO Science for Peace and Security Programme (EnzIL, G5713) and the Finnish Foundation for Technology Promotion (J. M. N.). Publisher Copyright: © 2022 The Authors. Published by Wiley-VCH GmbHVanadate-dependent chloroperoxidase from Curvularia inaequalis catalyzes 5-endo-trig bromocyclizations of α-allenols to produce valuable halofunctionalized furans as versatile synthetic building blocks. In contrast to other haloperoxidases, also the more challenging 5-exo-trig halocyclizations of γ-allenols succeed with this system even though the scope still remains more narrow. Benefitting from the vanadate chloroperoxidase‘s high resiliency towards oxidative conditions, cyclization-inducing reactive hypohalite species are generated in situ from bromide salts and hydrogen peroxide. Crucial requirements for high conversions are aqueous biphasic emulsions as reaction media, stabilized by either cationic or non-ionic surfactants.Peer reviewe
Soft Robot Locomotion with Metachronal Waves
No full textConventional robots adopt wheels or robotic limbs for locomotion. Wheels are simple to control but not suitable for irregular terrains. On the other hand, robotic feet can overcome a wider variety of surfaces but are less desirable due to their complex design and control system. In nature, we find that invertebrate animals, like snails, can go anywhere without needing the complex control system a rigid robot needs. Instead, they move forward by sending travelling deformations along their soft bodies. Inspired by these animals, we present a soft robot that uses a sequence of deformations for locomotion. This sequence of deformations is driven by a row of vibrating actuators that vibrate with the same frequency but a phase shift between each consecutive actuator. The metachronal wave arising from this vibration pattern offers efficient locomotion due to the continuous movement of the robot. The top speed achieved in this research was 5 mm/s for both forward and backward locomotion. Our study shows how the robot’s locomotion capabilities are affected by its material and how the robot's velocity depends on the mechanical design and the properties of the metachronal wave and provides a next step into soft robots that can efficiently move almost anywhere.Mechanical Engineering | BioMechanical Desig
A comparative two-stage, low temperature extraction of silica and alumina from coal fly ash to facilitate acid leaching of rare earth elements
Full text linkAbstract
Coal Fly ash (CFA) is an industrial waste but it contains packets of values such as alumina and rare earth elements (REEs) which can be extracted for use. The aluminosilicate phase constitutes a barrier to extraction of REEs from CFA during acid leaching. As a preliminary preparation for extraction of the entrapped REEs, this study examines a comparative two-stage process for low temperature extraction of silica conducted on Nigerian CFA samples. Samples were roasted with NaOH pellets at 100, 200 and 300 oC. The roasted products were subjected to room temperature leaching with the use of NaOH solution for the extraction of silica. Optimum silica extractions of 16.31%, 16.81% and 17.84% were obtained at 6 M, 90minutes, 30 mL/g; 6 M, 90minutes, 30 mL/g; and 3 M, 60minutes, 20 mL/g conditions of base conc, time and liquid-solid ratio for samples roasted at 100, 200 and 300°C respectively. A progressive quantitative silica extraction was observed with temperatures.Abstract
Coal Fly ash (CFA) is an industrial waste but it contains packets of values such as alumina and rare earth elements (REEs) which can be extracted for use. The aluminosilicate phase constitutes a barrier to extraction of REEs from CFA during acid leaching. As a preliminary preparation for extraction of the entrapped REEs, this study examines a comparative two-stage process for low temperature extraction of silica conducted on Nigerian CFA samples. Samples were roasted with NaOH pellets at 100, 200 and 300 oC. The roasted products were subjected to room temperature leaching with the use of NaOH solution for the extraction of silica. Optimum silica extractions of 16.31%, 16.81% and 17.84% were obtained at 6 M, 90minutes, 30 mL/g; 6 M, 90minutes, 30 mL/g; and 3 M, 60minutes, 20 mL/g conditions of base conc, time and liquid-solid ratio for samples roasted at 100, 200 and 300°C respectively. A progressive quantitative silica extraction was observed with temperatures
High frequency distributed temperature sensing and eddy covariance data observed at Hyytiälä measurement station during summer 2019
No full textThis record contains high frequency distributed temperature sensing and eddy covariance data observed at Hyytiälä measurement station and used in the following study:
Peltola, O., Aurela, M., Launiainen, S. and Katul, G. (2022), Probing the eddy size and its effective mixing length in stably stratified roughness sublayer flows. Q J R Meteorol Soc. Accepted Author Manuscript. https://doi.org/10.1002/qj.4386
Hyytiala_DTS_mm_yyyy.zip
These zip-files contain continuous high frequency potential temperature profiles measured along the Hyytiälä127-metre tall mast. See more information on the data in the netCDF-file attributes and on the measurement setup in the related scientific article.
EC27.zip
This zip-file contains high frequency data from an eddy covariance measurement setup located at 27 m height in the measurement height. See more information in EC27_readme.txt and on the measurement setup in the related scientific article.
EC67.zip
This zip-file contains high frequency data from an eddy covariance measurement setup located at 68 m height in the measurement height. See more information in EC67_readme.txt and on the measurement setup in the related scientific article.
codes_Hyytiala.zip
Matlab codes to produce similar figure as Fig. 2 in the abovementioned article
Radio channel modelling for 5G telecommunication system evaluation and over the air testing
No full textAbstract
This thesis discusses radio channel modelling for evolving radio access and of using the models in practice in a setup for radiated testing of radio devices. New telecommunication systems are constantly being developed to address continuously increasing wireless communication needs. The first pieces of intensively developed fifth generation (5G) networks and devices are planned to be available, in some form, approximately by 2020. An interesting feature of 5G concerning propagation and consequently channel modelling, is the expected utilization of frequencies clearly higher than the legacy cellular systems.
This work aims to define a channel model for the simulated evaluation of the coming 5G systems. New requirements for the channel model are identified and addressed. Further, over the air (OTA) testing of 5G devices in fading conditions is examined and a new setup is proposed. The test environment aims to reconstruct a time variant electromagnetic (EM) field around a device under test (DUT) considering the spatial, polarimetric, Doppler, and delay dispersion characteristics specified by the target channel model. Components and key design parameters of the setup are designated.
It was found that the proposed map-based channel model is capable of fulfilling the identified requirements. Furthermore, the simulations indicate that the state-of-the-art geometry-based stochastic channel model (GSCM) may give over-optimistic multi-user MIMO (MU-MIMO) performance in an urban micro-cellular environment. The sectored OTA concept was shown appropriate for device testing. Key parameters, such as the physical dimensions of the multi-probe anechoic chamber (MPAC) OTA configuration and the number of active probes, were determined by simulations.
The 3GPP is the main forum working towards 5G standards. A channel model for 5G evaluations has recently (2016) been specified. The base-line model is a GSCM inherited from the 4G models. However, the author expects that the proposed map-based models will gain popularity in the future, despite the current widespread use of GSCMs. In the 3GPP working group RAN4 (Radio performance and protocol aspects) the test methods for 5G user equipment (UE) are currently (2017) under investigation. The proposed sectored MPAC method has been contributed to and is under consideration in 3GPP. Even if it is not approved for UE testing, the author expects it to be useful for performance testing of base stations (BSs).Tiivistelmä
Tämän väitöskirjan sisältönä on radiokanavamallinnus langattomia tiedonsiirtojärjestelmiä varten ja lisäksi mallien käyttöönottoa tulevien radiolaitteiden säteilevässä testauksessa. Uusia tietoliikennejärjestelmiä kehitetään jatkuvasti, yhtä lailla jatkuvasti kasvavien tiedonsiirtotarpeiden tyydyttämiseksi. Ensimmäisten verkkojen ja päätelaitteiden pitäisi olla saatavilla tulevaan viidennen sukupolven (5G) järjestelmään vuoden 2020 tietämillä.
Työn tarkoituksena on määritellä kanavamalli 5G-järjestelmän simulointeja varten ja sitä edeltäen tunnistaa kanavamallin vaatimukset. Lisäksi tutkimuksen aiheena on 5G-laitteiden säteilevä (OTA) testaus häipyvässä radiokanavassa ja uuden testijärjestelmän määrittely tätä tarkoitusta varten. Ehdotetun testijärjestelmän keskeisenä toimintona on halutun sähkömagneettisen (EM) kentän tuottaminen testattavan laitteen ympärille. EM-kentän pitää olla kanavamallin mukainen ja toteuttaa sen häipymä-, tila-, polarisaatio-, doppler- ja viiveominaisuudet. Testijärjestelmän komponentit ja tärkeimmän suunnitteluparametrit pyritään selvittämään tässä työssä.
Tutkimuksessa havaittiin, että ehdotettu karttapohjainen kanavamalli toteuttaa 5G-mallille asetetut vaatimukset. Simuloinnit osoittavat myös, että tyypillisessä kaupunkiympäristössä suosittu GSCM-malli yliarvioi kanavan kapasiteetin monen käyttäjän MIMO-tekniikka käytettäessä. Lisäksi osoitettiin sektoroidun OTA-järjestelmän, jossa hyödynnetään useita antenneja, radiokanavaemulaattoria sekä radiokaiutonta huonetta (MPAC), käyttökelpoisuus 5G-laitteiden testaukseen. Kyseisen testausjärjestelmän parametrit määriteltiin.
3GPP on tärkein foorumi, jolla 5G-standardeja luodaan. Siellä on hiljattain (2016) sovittu 5G-simulointeja varten kanavamalli, joka ei ole tässä työssä ehdotetun kaltainen. Standardoitu malli on tyypiltään GSCM ja se on johdettu suoraan edellisen sukupolven (4G) kanavamallista. Kirjoittaja olettaa tästä GSCM:n nykyisestä vahvasta asemasta huolimatta, että ehdotettu karttapohjainen kanavamalli lisää suosiotaan tulevaisuudessa. Parhaillaan (2017) on 3GPP:n RAN4-työryhmässä käynnissä 5G-päätelaitteiden (UE) testimenetelmien määrittelyvaihe. Väitöskirjassa tutkittua sektoroitua MPAC-menetelmää on ehdotettu työryhmälle standardoitavaksi. Vaikka mainittua menetelmää ei siellä standardoitaisikaan UE-testaukseen, niin voidaan olettaa menetelmän olevan hyödyllinen erityisesti tukiasemien säteilevään testaukseen
Adolescents' mental health problems increase after parental divorce, not before, and persist until adulthood:a longitudinal TRAILS study
Full text linkParental divorce is one of the most stressful life events for youth and is often associated with (long-lasting) emotional and behavioral problems (EBP). However, not much is known about the timing of the emergence of these EBP in adolescents relative to the moment of parental divorce, and its longitudinal effects. We therefore assessed this timing of EBP in adolescents of divorce and its longitudinal effects. We used the first four waves of the TRacking Adolescent's Individual Lives Survey (TRAILS) cohort, which included 2230 10-12 years olds at baseline. EBP were measured through the Youth Self-Report (YSR), as internalizing and externalizing problems. We applied multilevel analysis to assess the effect of divorce on EBP. The levels of both internalizing and externalizing problems were significantly higher in the period after parental divorce (beta = 0.03, and 0.03, respectively; p <0.05), but not in the period before divorce, with a persistent and increasing effect over the follow-up periods compared to adolescents not experiencing divorce. Adolescents tend to develop more EBP in the period after parental divorce, not before. These effects are long-lasting and underline the need for better care for children with divorcing parents.</p
Students' experiences and expectations of technologies: an Australian study designed to inform planning and development decisions
Full text linkThe pace of technological change accompanied by an evolution in social, work-based and study behaviours and norms poses particular challenges for universities as they strive to develop high quality and sustainable technology-rich learning environments. Maintaining currency with the latest advances is resource intensive, hence the costs incurred in upgrading existing and introducing new technologies need to be carefully weighed up against the potential benefits to students. This calls for a multidimensional approach to planning, with the student voice being an important dimension. Three Australian universities have recently completed a project to gain a better understanding of students\u27 experiences and expectations of technologies in everyday life and for study purposes. The LMS and 25 other technologies ranging from established university offerings (email, learning management systems) to freely available social networking technologies (YouTube, Facebook) were surveyed. More than 10,000 students responded. This paper discusses the development of the survey and presents the broad trends that have emerged in relation to the current use of technologies and desired future use of these for learning purposes. The implications of the survey findings for developing institutional infrastructure to engage students and support their learning are highlighted
Tectonics and architectonic quality in recently published Finnish log architecture:corresponding architects’ perceptions
Full text linkAbstract
Due to the global increase in wood construction, it is crucial for architects to understand wood. In Finland, log building, a special subset of industrially manufactured massive timber construction materials is experiencing a renaissance. Cultural aspects combined with newer technical developments make log a complex material from the viewpoint of architectonic expression. To inform practicing architects, the aim of this study is to explore how the tectonics of logs contribute to the architectonic quality of log architecture. Semi-structured interviews among architects of twelve recently published log buildings are conducted. The results describe how architectonic quality is perceived among participants, and features of logs related to tectonics that they consider to be of importance in terms of architectonic quality. These features include the statics of log construction and log’s nature as a simultaneously insulating, load-bearing and visual material. Differences between industrial and hand-hewn logs, as well as other architectural aspects of using logs in contemporary architecture are discussed. Especially the “non-settling” log was perceived to have manifold implications for the architectonic possibilities of log architecture. The results are of practical importance to designing architects and the log industry. Theoretical implications include tangible information on architectonic quality and tectonics of log building
Molecules and morphology; integrative taxonomic analysis of marine planktonic assemblages
No full text No abstracts are to be cited without prior reference to the author. Conveners: Pennie Lindeque (United Kingdom), Lidia Yebra (Spain), Ann Bucklin (USA).CM 2018/M:118. Review and testing of universal and specific primers for the amplification of the barcode in marine epipelagic copepods. Beltrán-Castro Juan Ramón, Hernández-Trujillo Sergio, Gómez-Guitérrez Jaime, Blanco-Jarvio AnidiaCM 2018/M:106. Diet of sardina pilchardus larvae in the bay of Málaga (Alboran sea, SW Mediterranean) assessed by mitochondrial COI metabarcoding. Lidia Yebra, Candela García-Gómez, Nerea Valcárcel-Pérez, Alma Hernández de Rojas, M. Carmen Castro, Dolores Cortés, Jesús M. Mercado, Raúl LaizCarrión, Alberto García, Francisco Gómez-Jakobsen, Amaya Uriarte, José M.Rodríguez, José-María QuintanillaCM 2018/M:451. DNA elucidates identification, distribution and cohabitation of Calanus spp. in the North Atlantic and Arctic Oceans. Marvin Choquet, Janne Søreide, Galice HoarauCM 2018/M:136. Comparative molecular (metabarcoding) and morphological analysis of zooplankton diversity on the NW Atlantic continental shelf during 2002-2012. Bucklin, A., H.D. Yeh, J.M. Questel, B. Reese, N.J. Copley, and P.H. WiebeCM 2018/M:139. Reference COI barcode database for Arctic zooplankton: a critical resource for integrative taxonomy. DeHart, H.M., J.M. Questel, R.R. Hopcroft, K.N. Kosobokova and A. BucklinCM 2018/M:138. Species-specific patterns of distribution and abundance of the cryptic copepods Pseudocalanus moultoni and P. newmani on Georges Bank (NW Atlantic Ocean) 1995-2012. Erikson, K.B., L. Blanco-Bercial, N.J. Copley, P.H. Wiebe and A. BucklinCM 2018/M:477. Integrative metabarcoding analysis of mesopelagic biodiversity based on new sampling and sensing technologies. Annette F. Govindarajan, John A. Breier, Ann Bucklin, Andone Lavery, Kaitlyn Tradd, Peter Wiebe, Dana YoergerCM 2018/M:575. Challenges in appendicularian integrative taxonomy and barcoding. Rade Garić, Martin Pfannkuchen, Marcell Denes, Carmela Gissi, Per R. Flood, Mirna BatisticCM 2018/M:484. First environmental DNA assessment of planktonic metazoan assemblages at a Mediterranean long term ecological research site. Iole Di Capua, Maria Grazia Mazzocchi, Adriana Zingone Francesco Paolo Patti, Roberta PireddaCM 2018/M:412. Can proteomic fingerprinting help identify zooplankton diversity? Janna Peters, Silke Laakmann, Sven Rossel, Pedro Martínez Arbizu, Jasmin RenzCM 2018/M:392. Diversity of echinoderm larvae in Svalbard waters based on DNA barcoding. Katarzyna Walczyńska, Agata Weydmann, Marta Ronowicz, Janne Soreide, Tove GabrielsenCM 2018/M:449. DNA metabarcoding as tool for zooplankton biodiversity monitoring: the case of the Venice lagoon. Anna Schroeder, Alberto Pallavicini, Marco Pansera, David Stanković, Elisa CamattiCM 2018/M:472. Tropical biodiversity assessment of shelf eukaryotic communities via DNA metabarcoding. Judith Bakker, Owen S. Wangensteen, Dayne Buddo, Demian D. Chapman, AustinGallagher, Tristan L. Guttridge, Heidi Hertler & Stefano MarianiCM 2018/M:276. Molecules and morphology: three new and two well-known species of pelagic polychaetes from the Arctic Ocean. G.D. Kolbasova, K.N. Kosobokova, T.V. NeretinaCM 2018/M:511. Sequencing, cytometry, and imaging provide complementary assessment of plankton communities in the MVCO time series. Sosik, Heidi M., Rebecca Gast, Emily F. Brownlee, Emily E. Peacock, Kristen R. Hunter-Cevera</p
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