Carbon dioxide emissions from diesel and compressed natural gas buses during acceleration

Motor vehicle emission factors are generally derived from driving tests mimicking steady state conditions or transient drive cycles. However, neither of these test conditions completely represents real world driving conditions. In particular, they fail to determine emissions generated during the accelerating phase – a condition in which urban buses spend much of their time. In this study we analyse and compare the results of time-dependant emission measurements conducted on diesel and compressed natural gas (CNG) buses during an urban driving cycle on a chassis dynamometer and we derive power-law expressions relating carbon dioxide (CO2) emission factors to the instantaneous speed while accelerating from rest. Emissions during acceleration are compared with that during steady speed operation. These results have important implications for emission modelling particularly under congested traffic conditions

Software Firm Business Models with Virtual Communities

The introduction of internet technology has fundamentally changed the software industry. Instead of using the traditional licensing business model, software firms now compete with a wide variety of models, such as Software-as-a-Service, open source software models and virtual communities. However, there is yet very limited research on these new approaches. This exploratory paper contributes to the discussion on software business models and virtual communities by developing a taxonomy of how virtual communities are used as part of a business model. Using survey data collected from the Finnish software industry, a cluster analysis of the data reveals four different ways that firms utilize virtual communities in their business. The resulting high-level taxonomy contributes towards an understanding of the role of virtual communities in contemporary software firm business models

Marination increased tyramine levels in rainbow trout fillet strips packaged under modified atmosphere

Marinades are increasingly used to manufacture raw fish products. In corresponding meats, marinating is known to have a major effect on the composition of the microbiome, but the effect of marinating on fish is not known as well. This knowledge gap prompted our study of the microbial ecology and amine formation in marinated and unmarinated modified atmosphere commercially packaged rainbow trout fillet strips. According to our findings, marination increased the maximum concentrations (7-8 log CFU/g) of psychrotrophic bacteria by one loga-rithmic unit and led to 5 times higher average tyramine concentrations than the corresponding unmarinated product. Instead, trimethylamine concentrations were 30 times higher in the unmarinated product than those in the marinated one. According to the 16 S rRNA sequence analyses, lactic acid bacteria (LAB) predominated in the marinated strips one day after the use-by date, whereas in the unmarinated strips Fusobacteriaceae and LAB were the dominating taxa. Based on the culture-dependent analysis, Latilactobacillus fuchuensis was the prevailing LAB in both products. Since the subset of L. fuchuensis strains tested was able to produce tyramine in vitro, we hypothesise that the use of the acidic marinade activated the production of tyrosine-decarboxylating enzymes in L. fuchuensis and led to the increased tyramine concentrations.Peer reviewe

The Teachers' Views on the Significance of the Design and Craft Teaching in Finland

The Finnish curriculum for crafts emphasises the creative problem-solving skills of the student, the completion of different design tasks and the implementation of designs, while seeking to nurture the student’s self-esteem. Furthermore, students should draw up the designs for their artefacts, plan their work, and also develop designs when needed. These aims can be accomplished by teachers diligently teaching the designing of craft products. The purpose of the present study is to analyse teachers’ views on design as a part of the holistic craft process in the school context. The study was conducted in two phases. In the first phase five teachers were interviewed, and in the second phase four teachers wrote short essays. The research questions addressed were as follows: “What kind of views do teachers hold on students’ designing in the crafts area? How is designing implemented in craft teaching?” The results indicate that the extent of students’ participation in designing their craft product is dependent on the attitudes and competence of their craft teacher. Design-oriented teachers plan the designing situations and stimuli carefully and value design as a significant part of the craft process. Technique-oriented teachers will consider their students’ participation in design unnecessary or too challenging and as detracting from more essential learning outcomes, such as craft techniques. It seems the teachers need supplementary education to implement the new curriculum of crafts in Finland

Assessment of the Relaxation-Enhancing Properties of a Nitroxide-Based Contrast Agent TEEPO-Glc with In Vivo Magnetic Resonance Imaging

Magnetic resonance imaging examinations are frequently carried out using contrast agents to improve the image quality. Practically all clinically used contrast agents are based on paramagnetic metals and lack in selectivity and specificity. A group of stable organic radicals, nitroxides, has raised interest as new metal-free contrast agents for MRI. Their structures can easily be modified to incorporate different functionalities. In the present study, a stable nitroxide TEEPO (2,2,6,6-tetraethylpiperidin-1-oxyl) was linked to a glucose moiety (Glc) to construct a water-soluble, potentially tumor-targeting compound with contrast-enhancing ability. The ability was assessed with in vivo MRI experiments. The constructed TEEPO-Glc agent proved to shorten the T-1 relaxation time in tumor, while the T-1 time in healthy brain tissue remained the same. The results indicate the potential of TEEPO-Glc as a valuable addition to the growing field of metal-free contrast enhancement in MRI-based diagnostics.Peer reviewe

Characterization of trace metals on soot aerosol particles with the SP-AMS : detection and quantification

A method to detect and quantify mass concentrations of trace metals on soot particles by the Aerodyne soot-particle aerosol mass spectrometer (SP-AMS) was developed and evaluated in this study. The generation of monodisperse Regal black (RB) test particles with trace amounts of 13 different metals (Na, Al, Ca, V, Cr, Mn, Fe, Ni, Cu, Zn, Rb, Sr and Ba) allowed for the determination of the relative ionization efficiency of each metal relative to black carbon (RIEmeas). The observed RIEmeas/RIEtheory values were larger than unity for Na, Rb, Ca, Sr and Ba due to thermal surface ionization (TSI) on the surface of the laser-heated RB particles. Values closer to unity were obtained for the transition metals Zn, Cu, V and Cr. Mn, Fe, and Ni presented the lowest RIEmeas/RIEtheory ratios and highest deviation from unity. The latter discrepancy is unexplained; however it may be related to problems with our calibration method and/or the formation of metal complexes that were not successfully quantified. The response of the metals to the laser power was investigated and the results indicated that a minimum pump laser current of 0.6 A was needed in order to vaporize the metals and the refractory black carbon (rBC). Isotopic patterns of metals were resolved from high-resolution mass spectra, and the mass-weighted size distributions for each individual metal ion were obtained using the high-resolution particle time-of-flight (HR-PToF) method. The RIEmeas values obtained in this study were applied to the data of emission measurements in a heavy-fuel-oil-fired heating station. Emission measurements revealed a large number of trace metals, including evidence for metal oxides and metallic salts, such as vanadium sulfate, calcium sulfate, iron sulfate and barium sulfate, which were identified in the SP-AMS high-resolution mass spectra. SP-AMS measurements of Ba, Fe, and V agreed with ICP-MS analyzed filter samples within a factor of 2 when emitted rBC mass loadings were elevated.Peer reviewe

Genetic Diversity of the 2009 Pandemic Influenza A(H1N1) Viruses in Finland

Peer reviewe

Alien Registration- Ronkko, Lauri (Paris, Oxford County)

https://digitalmaine.com/alien_docs/22354/thumbnail.jp