Numerical solution of the PTT constitutive equation for unsteady three-dimensional free surface flows

This work deals with the development of a numerical technique for simulating three-dimensional viscoelastic free surface flows using the PTT (Phan-Thien-Tanner) nonlinear constitutive equation. In particular, we are interested in flows possessing moving free surfaces. The equations describing the numerical technique are solved by the finite difference method on a staggered grid. The fluid is modelled by a Marker-and-Cell type method and an accurate representation of the fluid surface is employed. The full free surface stress conditions are considered. The PTT equation is solved by a high order method, which requires the calculation of the extra-stress tensor on the mesh contours. To validate the numerical technique developed in this work flow predictions for fully developed pipe flow are compared with an analytic solution from the literature. Then, results of complex free surface flows using the FIT equation such as the transient extrudate swell problem and a jet flowing onto a rigid plate are presented. An investigation of the effects of the parameters epsilon and xi on the extrudate swell and jet buckling problems is reported. (C) 2010 Elsevier B.V. All rights reserved.

Desenvolvimento de um método numérico para simular escoamentos viscoelásticos axissimétricos com superfícies livres: Modelo PTT

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Application of the PTT Model to Axisymmetric Free Surface Flows

This work is concerned with numerical simulation of axisymmetric viscoelastic free surface flows using the Phan-Thien-Tanner (PTT) constitutive equation. A finite difference technique for solving the governing equations for unsteady incompressible flows written in Cylindrical coordinates on a staggered grid is described. The fluid is modelled by a Marker-and-Cell type method and an accurate representation of the fluid surface is employed. The full free surface stress conditions are applied. The numerical method is verified by comparing numerical predictions of fully developed flow in a pipe with the corresponding analytic solutions. To demonstrate that the numerical method can simulate axisymmetric free surface flows governed by the PTT model, numerical results of the flow evolution of a drop impacting on a rigid dry plate are presented. In these simulations, the rheological effects of the parameters epsilon and xi are investigated.

Técnica para dedução do modelo algébrico PTT, aplicações e análises numéricas em escoamentos bidimensionais

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Screening for lupus anticoagulant: improving the performance of the lupus-sensitive PTT-LA

Introduction: The aim of the present work was to verify whether calculating a ratio between clotting times obtained with the sensitive PTT-LA and a less sensitive activated partial thromboplastin time (aPTT)-reagent may represent a valuable aPTT-based screening strategy for lupus anticoagulants (LA). Methods: For the pilot study, plasma samples from normal subjects (n = 15) and from patients with LA (n = 10), therapeutic anticoagulation with vitamin K-antagonists (VKA) (n = 15) or unfractionated heparin (n = 15), coagulation factors deficiency (n = 16), and inhibitory antibodies against factor VIII or IX (n = 11) were studied. For the evaluation study, 1553 consecutive plasma samples from nonanticoagulated patients investigated for LA between January 2005 and December 2007 at our institution were studied. Following screening strategies were employed: Pathromtin-SL (aPTT-SL), PTT-LA (aPTT-LA), ratio aPTT-LA/aPTT-SL (aPTT-ratio), and Russell's viper venom (RVV) based LA-Check. LA positive samples were identified by mixing studies and diluted RVV confirmation test (LA-Check/LA-Sure). Results: Pilot study: All screening strategies had a 100% sensitivity, and the aPTT-ratio reached the highest specificity (82%; 95%CI: 74-90%). Within the evaluation study, following sensitivities for LA screening were observed: aPTT-SL 59.0% (95%CI: 57-61%), aPTT-LA 82.1% (95%CI: 80-84%), aPTT-ratio 92.3% (95%CI: 91-94), and LA-Check 83.3% (95%CI: 82-85%). Conclusion: Calculating a ratio between the LA-sensitive PTT-LA and the less sensitive Pathromtin-SL improves the performance of the PTT-LA itself and represents a simple and sensitive aPTT-based integrated strategy for LA screening.

PTT: Progress Test Tiermedizin

Studierende der Tiermedizin fokussieren sich im Studium oft auf den bloßen Wissenserwerb und nehmen dabei weniger wahr, was sie bereits erreicht haben. Mit dem Progress Test Tiermedizin (PTT) kann der Lernfortschritt von Studienanfang bis zum Erreichen des Berufsabschlusses als Tierärztin/Tierarzt dargestellt werden. Das Konzept des PTT soll in diesem Artikel erläutert werden

Extracorporeal lessons from sheep

Background: Extracorporeal circulation (ECC), the diversion of blood flow through a circuit located outside of the body, has been one of the major advances in modern medicine. Cardio-pulmonary bypass (CPB), renal dialysis, apheresis and extracorporeal membrane oxygenation (ECMO) are all different forms of ECC. Despite its major benefits, when blood comes into contact with foreign material, both the coagulation and inflammation cascades are activated simultaneously. Short periods of exposure to ECC e.g. CPB (�2 h duration), are known to be associated with haemolysis, coagulopathies, bleeding and inflammation which demand blood product support. Therefore, it is not unexpected that these complications would be exaggerated with prolonged periods of ECC such as in ECMO (days to weeks duration). The variability and complexities of the underlying pathologies of patients requiring ECC makes it difficult to study the cause and effect of these complications. To overcome this problem we developed an ovine (sheep) model of ECC. Method: Healthy female sheep (1–3 y.o.) weighing 40–50 kg were fasted overnight, anaesthetised, intubated and ventilated [1]. Half the group received smoke induced acute lung injury (S-ALI group) (n = 8) and the other half did not (healthy group) (n = 8). Sheep were subsequently cannulated (Medtronic Inc, Minneapolis, MN, USA) and veno-venous ECMO commenced using PLS ECMO circuit and Quadrox D oxygenator (Maquet Cardiopulmonary AG, Hechinger Straße, Germany). There was continuous physiological monitoring and blood was collected at specified time intervals for full blood counts, platelet function analysis (by Multiplate®), routine coagulation and assessment of clot formation and lysis (by ROTEM®). Preliminary results Full blood counts and routine coagulation results from normal healthy sheep were comparable to those of normal human adults. Within 15 min of initiating of ECMO, PT, PTT and EXTEM clot formation time increased, whilst EXTEM maximum clot firmness decreased in both cohorts. Discussion & Conclusions: Preliminary results of sheep from both 2 h ECMO cohorts showed that the anatomy, haematology and coagulation parameters of an adult sheep are comparable to that a human adult. Experiments are currently underway with healthy (n = 8) and S-ALI (n = 8) sheep on ECMO for 24 h. In addition to characterising how ECMO alters haematology and coagulation parameters, we hope that it will also define which blood components will be most effective to correct bleeding or clotting complications during ECMO support.

Moraalinen mahdottomuus : Nicaraguan terveydenhuollon työntekijät katolisen kirkon seksuaalietiikan ja oman ammattietiikkansa välissä

Tarkastelen tässä pro gradu –tutkielmassa kirkon ja uskonnon vaikutusta seksuaali- ja lisääntymisterveyteen Nicaraguassa. Työn viitekehyksenä on Suomen rahoittama seksuaali- ja lisääntymisterveyttä, tasa-arvoa sekä naisten vaikutusmahdollisuuksia edistävä kehitysyhteistyöhanke Nicaraguassa. Tutkimuksen aineisto koostuu kahdestakymmenestäkahdesta haastattelusta, jotka keräsin Nicaraguassa maalis-huhtikuussa 2007. Haastattelumetodiksi valitsin teemahaastattelun, jota muotoilin feministisen haastatteluperinteen mukaisesti. Selvitän tutkimuksessani Nicaraguassa keräämäni haastatteluaineistoni kautta katolisen naisen toimijuutta eli sitä, miten katolisten naisten on mahdollista irtautua niin konservatiivisten katolisten kuin maallistuneiden feministien uskovalle naiselle antamasta perinteisestä asemasta. Teoreettisena viitekehyksenä tutkimuksessa on Susan Starr Seredin luoma uskonnollisen naisen jatkumo, jonka ääripäissä ovat symbolinen nainen ja toimijanainen. Seredin mallin avulla tulkitsin haastattelemieni uskonnollisten naisten sekä heidän kertomustensa kautta heidän asiakkaittensa toimijuutta seksuaali- ja lisääntymisterveyteen liittyvissä kysymyksissä. Analysoin haastateltavieni kertomuksia työnsä ja uskontonsa välisistä ristiriitatilanteista tai tilanteista, joissa ristiriitaa ei ollut syntynyt kirkon virallisesta opetuksesta huolimatta. Muovasin lopulta Seredin jatkumosta ympyränmallisen uskonnollisuuden kentän, jossa symbolinen nainen on ympyrän keskellä ja naisten toimijuus ympyrän kehällä. Haastattelemani terveydenhuollon työntekijät sijoittuivat lähelle toimijuuden kehää, tasapainotellen kuitenkin ainakin puheen tasolla katolisen kirkon virallisen opin ja sitä kautta symbolisen naisen position ja oman ammattietiikkansa välissä. Aineistostani näkyi, että katolisen kirkon seksuaalimoraali vaikutti niin terveydenhuollon työntekijöiden kuin asiakkaidenkin elämään. Kirkon oppi ei kuitenkaan analyysini mukaan rajoittanut haastateltavieni toimijuutta, vaan asetti nämä uskonnolliset naiset tilanteeseen, jossa he joutuivat käymään vuoropuhelua työnsä ja uskontonsa välisten ristiriitaa synnyttävien ohjeiden ja velvoitteiden kanssa. Useimmiten haastateltavat erottautuivat kirkon virallisesta opista ja samaistuivat terveydenhuollon vaatimuksiin. Muutama haastateltava identifioi itsensä vahvasti kirkkoon, mutta erottautui kuitenkin sen virallisesta opista vedoten ammattietiikkaansa. Kirkosta ei kuitenkaan haluttu erottautua kokonaan, vaan toivottiin yhteistyötä kirkon kanssa seksuaali- ja lisääntymisterveyden parantamiseksi. Haastattelemani terveydenhuollon työntekijät olivat kaikki aktiivisia toimijoita. Heidän uskonnollisuutensa näkyi heidän moraalisissa pohdinnoissaan, mikä samalla vahvisti heidän toimijuuttansa: he tulkitsivat haastatteluissa uskontoa ja kristillistä oppia omien moraalikäsityksiensä mukaisesti uudestaan ja oikeuttivat näin eettisesti nekin työtehtävänsä, jotka eivät ole linjassa katolisen kirkon virallisen opin kanssa. Osa haastateltavista muodosti oman uskonnontulkintansa oman moraalikäsityksensä pohjalta, osa taas vieraannutti työnsä ja uskontonsa välisen ristiriidan käsittelemällä esimerkiksi terveydellisistä syistä tehtävää aborttia vain lääketieteellisenä toimenpiteenä. Ehkäisymenetelmien käyttöön vaikutti kirkkoa ja uskontoa enemmän kulttuuri, jonka mukaan miehellä on oikeus päättää perheen asioista – ja myös puolisonsa lisääntymisestä. Useat naiset käyttävätkin ehkäisymenetelmiä salaa perheeltään. Seksuaalikasvatusta pidettiin merkittävänä kansallisen seksuaali- ja lisääntymisterveysstrategian tavoitteiden saavuttamiseksi. Tavoitteiden saavuttamiseksi haastateltavat toivoivat laajempaa yhteistyötä niin kirkkojen kuin opetusministeriönkin kanssa. Kirkolla ja uskonnolla on vaikutusta yhteiskunnan arvoihin, moraalikäsityksiin ja hyväksyttäviin käyttäytymismalleihin. Naisen yhteiskunnallinen asema, mahdollisuus päättää itse omasta seksuaalisuudestaan ja lisääntymisestään ja hänen taloudelliset mahdollisuutensa elää näiden valintojen mukaisesti vaikuttavat kaikki lisääntymis- ja seksuaalioikeuksien toteutumiseen. Vaikka useimmat haastateltavani erottautuivatkin kirkon virallisesta opista, kirkon ja uskonnon vaikutuksella on merkitystä seksuaali- ja lisääntymisterveydenhuoltoa edistävien kehitysyhteistyöhankkeiden tavoitteiden toteutumiseen.

Viemärin päässä Kotkan kaupunki : Vesiensuojelun kehitys Kymijoen itäisen päähaaran suulla 1945-1970

The focus of this thesis is the marine environmental history of the eastern part and the estuary of the Kymi river from 1945 to 1970. There is no previous research on this area from an environmentally historical perspective, nor have many of the sources here discussed been previously used. Therefore the thesis expands academic understanding of local environmental processes and protection in and around the city of Kotka and the Kymi river. The thesis falls within the methodological field of socio-political history, as the research focus is centered on the local process of establishing the nature of environmental problems and solving them. The principal assumption has been that the city of Kotka, due to its ongoing expansion, was slow to respond to environmental hazards. The Kymi river was among the most degraded bodies of water during this period. Kotka on the other hand was a major center of wood processing industry and one of Finlands major industrial ports. In the past the river and its estuary had provided ample resources for fishers. It is this contradictory use of the environment that allows one to discuss the local struggle for the correct use of the environment. Primary sources include local and city archives, environmental studies, and legal documents linked with the above. The archives of the city of Kotka and of various private associations form the core sources. Environmental studies from the research period have been dealt with as sources to the local political power struggle. Alongside with current environmental research they also provide insight into the state of the environment. Another goals has been to accumulate environmental research for a future multidisciplinary study in this area. As a final conclusion it can be said that environmental degradation was widely understood as a problem only in the 1960s. The influential role of the city of Kotka however determined the pace with which these problems were then solved.

Arkeologia, historialliset kartat ja paikkatieto

This licentiate thesis is composed of three parts, of which the parts 2 and 3 have been published elsewhere. Part 1 deals with the research history of large-scaled historical maps in Finland. The research done in four disciplines – archaeology, history, art history and geography – is summarized. Compared to the other disciplines, archaeology is characterized by its deep engagement with the location. Because archaeology studies different aspects of the past through material culture, it is the only discipline in which the concrete remains portrayed on the maps are “dug up”. For the archaeologist, historical maps are not merely historical documents with written information and drawings in scale, but actual maps which can be connected with the physical features they were made to illustrate in the first place. This aspect of historical maps is discussed in the work by looking at the early (17th and 18th century) urban cartographic material of two Finnish towns, Savonlinna and Vehkalahti-Hamina. In both cases, the GIS-based relocating of the historical maps highlights new aspects in the early development of the towns. Part 1 ends with a section in which the contents of the entire licentiate thesis are summarized. Part 2 is a peer reviewed article published in English. This article deals with the role of historical maps converted into GIS in archaeological surveys made in Finnish post-medieval towns (16th and 17th centuries). It is based on the surveys made by the author between 2000 and 2003 and introduces a new method for the archaeological surveying of post-medieval towns with wooden houses. The role of archaeology in the sphere of urban research is discussed. The article emphasizes that the methods used in studying the development of southern European towns with stone houses cannot be adequately applied to the wooden towns of the north. Part 3 is a monograph written in Finnish. It discusses large-scaled historical maps and the methods for producing digital spatial information based on historical maps. Since the late 1990’s, archaeological research in Finland has been increasingly directed towards the historical period. As a result, historical cartography has emerged as one of the central sources of information for the archaeologist, too. The main theme of this work is the need for using historical maps as real maps which, surprisingly, has been uncommon in the historical sciences. Projecting historical maps to the very place they were made to illustrate is essential to understanding the maps. This is self-evident for the archaeologist, who is accustomed to studying the material past, but less so to researchers in other historical disciplines that concentrate on written and visual sources of information. With the help of GIS, the historical maps can be concretely linked to the places they were originally made to illustrate. In doing so, and equipped with a cartographic comprehension, new observations can be made and questions asked, which supplement and occasionally challenge the prevailing views.

Koulun profiloitumisen haavoittuvuus : Tapaustutkimus opettajien vaihtuvuuden vaikutuksista Montessori-menetelmää soveltavassa yhdysluokassa 1-2

Tutkimuksen tavoitteena oli selvittää koulujen profiloitumisen ja opettajien vaihtuvuuden välistä yhteyttä. Nykyisen koulutuspolitiikan mukaisesti koulujärjestelmämme päätäntävalta on siirtynyt yhä enemmän koulujen tasolle ja mahdollistaa siten kouluille oikeuden päättää melko itsenäisesti tarjoamansa opetuksen sisällöistä, tavoitteista ja menettelytavoista. Kouluilla on myös oikeus laatia omat opetussuunnitelmansa ja näin profiloitua haluamalleen painotusalueelle. Työvoiman liikkuvuuden myötä myös opettajat vaihtavat työpaikkaansa. Käytännössä tämä tarkoittaa opettajien siirtymistä kouluista ja tehtävistä toisiin eripituisten työskentelyjaksojen jälkeen. Tällaisesta vaihtuvuudesta ja sen vaikutuksista koulun työskentelyilmapiiriin sekä kaikkiin koulumaailman osapuoliin voidaan kuitenkin olla montaa eri mieltä. Erityisesti vaikutukset johonkin pienempään opetusyksikköön voivat olla melkoiset. Tutkimus toteutettiin eräässä helsinkiläisen ala-asteen koulussa, keskittyen opettajien vaihtuvuuden tarkasteluun Montessori-pedagogiikalla opetettavassa yhdysluokassa. Tutkimukseen sisällytettiin Montessori-luokan oppilaat, heidän vanhempansa sekä koulun opettajat. Tutkimus suoritettiin kirjallisuuteen perehtyen, luokkaa observoiden, oppilaita ja opettajia haastatellen sekä vanhemmilla kirjoitelmia teettäen. Aineiston suppeuden ja tutkimuksen case study -luonteen vuoksi vaihtuvuuden moninaisia vaikutuksia ilmentäviä tutkimustuloksia ei kuitenkaan voida yleistää. Avainsanat: profiloituminen, vaihtuvuus, vaihtuvuuden vaikutukset, Montessori-pedagogiikka Keywords: profilation, changing, effects of changing, Montessori method

Population structure of South African and Australian Pyrenophora teres isolates.

There are two recognized forms of the disease net blotch of barley: the net form caused by Pyrenophora teres f. teres (PTT) and the spot form caused by P. teres f. maculata (PTM). In this study, amplified fragment length polymorphism analysis was used to investigate the genetic diversity and population structure of 60 PTT and 64 PTM isolates collected across Australia (66 isolates) and in the south-western Cape of South Africa (58 isolates). For comparison, P. tritici-repentis, Exserohilum rostratum and Bipolaris sorokiniana samples were also included in the analyses. Both distance-and model-based cluster analyses separated the PTT and PTM isolates into two strongly divergent genetic groups. Significant variation was observed both among the South African and Australian populations of PTT and PTM and among sampling locations for the PTT samples. Results suggest that sexual reproduction between the two forms is unlikely and that reproduction within the PTT and PTM groups occurs mainly asexually.

Demokratiaa luokkahuoneessa : Toimintatutkimus kolmasluokkalaisten osallistamisesta päätöksentekoon

The crucial questions that define democracy relate to its depth and width: who can participate in decision making and what kind of things can be commonly decided? Theories deeper than representative democracy emphasize discussion, in which by evaluating justifications it is possible to achieve consensus in ideal situation. The aim of my research is to develop tools for promoting the participation of third graders in decision making in the classroom. In addition I study the development of depth and width of democracy in the classroom, the development of skills and competencies in the decision making and the challenges of the project. My research method is participative action research. I collected my data between October 2007 and March 2008. I used videos and observation diaries as my primary data. Additional data consisted of the interviews of the students, the conversations between the adults and the material produced by the teacher. Since we discussed the matters students had highlighted in specific lessons, my analysis proceeds according to these lessons constructing a general view of the process. The width and depth of classroom democracy are difficult to define. Though the system we had created enabled third graders to discuss matters they found important the participation was unequal: some of the students couldn’t among other things give justifications for their opinions. This poses challenges for models that emphasize deliberation since these theories presuppose that everyone has concordant competencies. But then again only critical citizens who are able to make justifications and to evaluate them are able to oppose indoctrination. This makes teaching these competencies justified. Different decision making procedures define the classroom democracy. Deliberation doesn’t necessarily provide deeper information about the preferences of the participants than mere voting. But then again voting doesn’t express the reasons which support one’s preferences. Structured conversation can equalize the time used for every participant’s opinions, but doesn’t solve the challenge of unequal competencies. Children’s suggestion box diversified the possibilities to participate, and also the silent ones used it during the research. The asymmetry in deliberation might also be caused by the social structure of the students. Teacher’s directing and participation encouraging role in deliberation was significant. Diversifying the participation by different roles could equalize the asymmetry in participation.

Satellite Telemetry and Long-Range Bat Movements.

Background: Understanding the long-distance movement of bats has direct relevance to studies of population dynamics, ecology, disease emergence, and conservation. Methodology/Principal Findings: We developed and trialed several collar and platform terminal transmitter (PTT) combinations on both free-living and captive fruit bats (Family Pteropodidae: Genus Pteropus). We examined transmitter weight, size, profile and comfort as key determinants of maximized transmitter activity. We then tested the importance of bat-related variables (species size/weight, roosting habitat and behavior) and environmental variables (day-length, rainfall pattern) in determining optimal collar/PTT configuration. We compared battery- and solar-powered PTT performance in various field situations, and found the latter more successful in maintaining voltage on species that roosted higher in the tree canopy, and at lower density, than those that roost more densely and lower in trees. Finally, we trialed transmitter accuracy, and found that actual distance errors and Argos location class error estimates were in broad agreement. Conclusions/Significance: We conclude that no single collar or transmitter design is optimal for all bat species, and that species size/weight, species ecology and study objectives are key design considerations. Our study provides a strategy for collar and platform choice that will be applicable to a larger number of bat species as transmitter size and weight continue to decrease in the future.

Devolution of forest-related rights: Comparative analyses of six developing countries

The study focused on the different ways that forest-related rights can be devolved to the local level according to the current legal frameworks in Laos, Nepal, Vietnam, Kenya, Mozambique and Tanzania. The eleven case studies represented the main ways in which forest-related rights can be devolved to communities or households in these countries. The objectives of this study were to 1) analyse the contents and extent of forest-related rights that can be devolved to the local level, 2) develop an empirical typology that represents the main types of devolution, and 3) compare the cases against a theoretical ideal type to assess in what way and to what extent the cases are similar to or differ from the theoretical construct. Fuzzy set theory, Qualitative Comparative Analysis and ideal type analysis were used in analysing the case studies and in developing an empirical typology. The theoretical framework, which guided data collection and analyses, was based on institutional economics and theories on property rights, common pool resources and collective action. On the basis of the theoretical and empirical knowledge, the most important attributes of rights were defined as use rights, management rights, exclusion rights, transfer rights and the duration and security of the rights. The ideal type was defined as one where local actors have been devolved comprehensive use rights, extensive management rights, rights to exclude others from the resource and rights to transfer these rights. In addition, the rights are to be secure and held perpetually. The ideal type was used to structure the analysis and as a tool against which the cases were analysed. The contents, extent and duration of the devolved rights varied greatly. In general, the results show that devolution has mainly meant the transfer of use rights to the local level, and has not really changed the overall state control over forest resources. In most cases the right holders participate, or have a limited role in the decision making regarding the harvesting and management of the resource. There was a clear tendency to devolve the rights to enforce rules and to monitor resource use and condition more extensively than the powers to decide on the management and development of the resource. The empirical typology of the cases differentiated between five different types of devolution. The types can be characterised by the devolution of 1) restricted use and control rights, 2) extensive use rights but restricted control rights, 3) extensive rights, 4) insecure, short term use and restricted control rights, and 5) insecure extensive rights. Overall, the case studies conformity to the ideal type was very low: only two cases were similar to the ideal type, all other cases differed considerably from the ideal type. The restricted management rights were the most common reason for the low conformity to the ideal type (eight cases). In three cases, the short term of the rights, restricted transfer rights, restricted use rights or restricted exclusion rights were the reason or one of the reasons for the low conformity to the ideal type. In two cases the rights were not secure.