PMSS and gral inter-comparison: Strengths and weaknesses of the two models in reproducing Urban NOx levels in a real case application

Air dispersion models are useful tools for quantifying pollutant concentrations in urban environment however many issues related to the dispersion estimation within urban canopy still persist. Most of them concern the emissions estimation, the flow field reconstruction between obstacles (buildings, bridges, tunnels, etc.) and the pollutant dispersion driven by the estimated flow field. This study presents results of a model inter-comparison conducted in a real case study, focusing on a 6 km x 6 km square domain covering the city of Modena (Italy), between two Lagrangian dispersion models set-up with the aim of estimating the NOx concentrations produced by traffic flow within the urban area of the city. Comparisons are made between the Graz Lagrangian Model (a.k.a. GRAL) and the Parallel Micro SWIFT and SPRAY (a.k.a. PMSS) modelling suite, in terms of dispersion concentrations and computing cost. The horizontal resolution for both the models is set to 4 meters and the traffic emissions estimation is based on a bottom-up approach: the PTV VISUM traffic model is used to estimate traffic flows on the Modena urban road network and the EMEP/EEA cold and hot emission factors are employed to estimate related emissions. All the other urban emission sources were considered to contribute to the regional background concentrations and estimated with the WRF-Chem model, which estimates also initial and boundary meteorological conditions (multi-scale approach). The general objective of the inter-comparison is to use equivalent input data for both the models keeping the emissions and the meteorological initial and boundary/condition consistent so that any discrepancies in output would be the results of differences in the micro-scale dispersion models. Since different turbulence parametrisation and dispersion scheme are implemented in the two models, the goal of this study is to identify the strengths and the weaknesses of both the models in reproducing urban NOx concentrations, in a real case application, at urban traffic and urban background sites

New avenues for integrating information literacy into the curriculum

A generally understood mission of library instruction programs is to promote information literacy (IL) and critical thinking across the curriculum. The majority of programmatic IL collaborations with higher education core curricula are found in introductory composition or communication courses. Other more unconventional avenues offer potentially more effective ways to teach students the basic IL concepts and skills. At the University of Nevada, Las Vegas (UNLV), conversations with College of Education faculty helped librarians identify a strategic and unique point of entry for IL instruction. Using the ADDIE model as a conceptual framework, librarians and an instructional designer met with the course coordinators for the Valuing Cultural Diversity course to collaboratively develop tools and assignments that deconstruct and scaffold the research process for students. The systematic approach for identifying this course, developing the partnership, creating the assessment tools, and refining instruction and assignments based on our findings will be discussed

Whipping up the “Why Paper”: Inquiry into diverse perspectives

Students are introduced to various databases that provide access to alternative perspectives and to an advanced organizer designed to foster critical evaluation of sources. In a Valuing Cultural Diversity course, required for all undergraduate education majors, students are asked to write a Why paper to investigate and understand alternative perspectives, looking particularly at the perspectives of a cultural group different from their own

Impact of vehicular emissions in an urban area of the Po valley by microscale simulation with the GRAL dispersion model

This work sets out the test of the GRAL model (Graz Lagrangian Model, vs.18.1) in the urban area of Modena (Po valley, Northern Italy). The simulation domain sizes 2 000 x 3 000 m2 and it features 'microscale' cells of 4 x 4 m2. The simulation focuses on an intersection featured by large traffic flows next to a school and a regulatory air quality monitoring station classified as an urban traffic site. The model is a lagrangian particle dispersion model and it takes into account the presence of buildings as obstacles and generating microscale wind fields accordingly, making this class of model suitable for investigating spatial pattern of atmospheric pollution in urban areas where local accumulation might occur. The simulation investigates traffic emissions of nitrogen oxides (NOx) over the period October 29 to November 10, 2016, when direct measurements of traffic flow were collected by four one-channel doppler radar traffic counters. These counters provided continuous estimate of vehicle length, speed and number. These latter data were combined with available traffic flows at rush hour by PTV VISUM mobility software and the fleet composition of the municipality to estimate the total NOx emissions by vehicular traffic over the roads included in the simulation domain. NOx simulated concentrations showed a moderate correlation with the NOx observations at the nearby monitoring site. To have a better insight on the potential and the limitations of the GRAL model, its results will be compared with the output of the lagrangian particle dispersion model PMSS over the same area

Cooking up concept maps

Concept maps allow students to visually work through an idea for potentially useful search terms. A common roadblock students experience in the research process is identifying central concepts in their research questions and devising useful ways to reframe search terms. Concept mapping is one instructional strategy that can be used to help students better identify the central concepts in their research questions and expand on other ways these concepts are articulated in the literature

Stratigraphic and taxonomic considerations on the late Cretaceous rudist fauna of Aksai Chin (Western Tibet, China) from the De Filippi collection

The rudist fauna collected in western Tibet in the Aksai Chin area by the DE FILIPPI expedition in 1914 has been reprised and redescribed. This fauna is composed of Radiolites cf. lusitanicus, Radiolites sp., Gorjanovicia cf. endrissi, ? Sauvagesia sp., Sphaerulites sp., Durania sp., and Gyropleu-ra sp. The rudist-bearing beds belong to the Tielongtan Group of the Tianshuihai terrane. The Turo-nian-? Coniacian Xiloqzung Formation (Fm.) bear the older rudists (Radiolites cf. lusitanicus, Radiolites sp., Sphaerulites sp., Durania sp.), whereas younger ages have been determined through microfossil analysis which, compared with the western Neotethys records, suggests an early-mid Campanian age. This allowed to ascribe the younger rudists of the collection (Gorjanovicia cf. endrissi, ? Sauvagesia sp., Gyropleura sp., Radiolites sp.) to the Dongloqzung Formation. Our data confirm that rudist-bea-ring facies in the Tielongtan Group extend at least up to the middle Campanian. The Aksai Chin rudist assemblage should belong to the Southwestern Asian assemblage of the Eastern Mediterranean Sub-province

Upper Cretaceous stratigraphy and rudist-bearing facies of the Simbruini Mts. (Central Apennines, Italy). New field data and a review

The rudist-bearing carbonate platform succession of Marsia, in the northern Simbruini Mts. (Central Apennines), is described for the first time through the analysis of two stratigraphic sections, and better characterized by the study of three single significant outcrops located outside the sections. The identification of the rudist assemblages, related facies and micropaleontological analyses of the collected samples allowed to determine the age of this Upper Cretaceous succession, and the definition of a biostratigraphic frame for the of the entire study area. The Marsia composite stratigraphic section encompasses the late Turonian-early/middle Campanian interval, and records the evolution from inner platform-low hydrodynamic setting in the late Turonian, to an open platform setting characterized by high hydrodynamism in the late Santonian-early/middle Campanian. This succession has been compared to the already described Trevi, Santa Maria dei Bisognosi and Subiaco carbonate platform successions, and to regional bioevent schemes, in order to constrain the evolution of these carbonate facies in a wider sedimentological and stratigraphic context. Since the late Turonian, a spreading of rudist facies occurred throughout the central-southern Apennines, representing the first Upper Cretaceous rudist bioevent. In the Simbruini area inner platform environments, characterized by soft fine-grained sediment, are widespread. The successions of Marsia and Trevi, which are marked by upper Turonian inner platform facies with a thriving oligospecific rradiolitid association characterized by semi-infaunal lifestyle, record this bioevent. During the Santonian and the early Campanian a gradual increase in hydrodynamic conditions is recorded by rudist assemblages with hippuritids and robust radiolitids, associated with rare corals and echinoids which mark the second and third Upper Cretaceous rudist bievent, recorded at Marsia, Trevi and Santa Maria dei Bisognosi. The middle Campanian-Maastrichtian bioevents are only represented at Santa Maria dei Bisognosi and Subiaco, where high energy bioclastic facies, dominated by the peculiar radiolitid Sabinia sp., occur

Comparing continuous lumbar plexus block, continuous epidural block and continuous lumbar plexus block with a parasacral sciatic nerve block on post-operative analgesia after hip arthroplasty

Study Objective: To compare post-operative analgesia obtained by continuous lumbar epidural block (CLEB) versus continuous lumbar plexus block (CLPB) versus CLPB associated with a single shot parasacral sciatic nerve block (CLEBS) after total hip arthroplasty (THA). Study design: Randomized clinical trial. Setting: Operating room, postoperative care unit, orthopedic surgical ward. Methods: 78 ASA I-III patients undergoing elective THA were randomly assigned to receive CLEB (n=24, 15-20 ml of 5 mg/ml ropivacaine, sufentanil 10 mg, clonidine 1 mg/ml), CLPB (n=22, 3mg/kg of 5 mg/ml of ropivacaine, max. 40 ml, clonidine 1 mg/ml, sufentanil 10 mg) or CLPBS (n=23, CLPB as described above; sciatic nerve: 20 ml of ropivacaine 5 mg/ml, clonidine 1 mg/ml). All patients received continuous infusion of 2 mg/ml of ropivacaine, 8 ml/h for 48 hours. Primary outcome was pain intensity assessment (VAS and VS). Secondary outcomes were postoperative total opioid consumption, hemodynamic stability, motor blockade, blood loss, intraoperative sufentanil and propofol consumption, patient satisfaction and complications. Results: VAS was lower in the CLEB group than in the CLPB and CLPBS groups respectively for 6 and 12 hours postoperatively (post-surgery p<0.001, 2h p<0.001, 6h p<0.001, 12h p<0.03)(Table 2). Moreover, CLPSB patients reported lower VAS than CLPB patients from the end of the surgery till the 12th follow up hour (Table 2). VS was lower in the CLEB group from the end of surgery to 6h postoperatively (Table 3). The CLPB group showed higher morphine consumption than the CLPSB and CLEB groups over 12 h postoperatively (p=0.05); thereafter, no statistically significant diferences were observed between groups at the end of follow up (48h) (p=0.4) (Table 4). onclusion: In conclusion, continuous lumbar plexus block in association with single shot sciatic nerve block is a valid alternative to epidural technique in managing postoperative analgesia after THA, with an improved risk-benefit balanc

Unconventional avenues to integrating information literacy into the curriculum

Library instruction programs continue to seek meaningful ways to infuse information literacy into both general education and discipline-specific course sequences. At the University of Nevada, Las Vegas (UNLV), targeted conversations with College of Education faculty helped librarians identify a strategic and unique point of entry with a multicultural twist

The comparing of ultrasound-guided techniques:sciatic block with continous lumbar plexus block or continous femoral nerve block for aneshtesia and analgesia of total knee replacement

Abstract: Background and Aims: This double blind prospective randomized clinical trial evaluated the efficacy and safety of continuous ultrasound-guided lumbar plexus block compared to continuous ultrasound-guided femoral nerve block, in the intra-operative and postoperative periods after total knee replacement. Methods: Forty ASA I-III patients were randomized to receive: continuous femoral block (n= 20, 30 ml of ropivacaine 5 mg/ml) or continuous lumbar plexus block (n= 20, 30 ml of ropivacaine 5 mg/ml) both in association with single injection sciatic nerve block. All patients received continuous infusion of 2 mg/ml of ropivacaine at 8 ml/h for 48 hours and intra- venous morphine for patient-controlled analgesia. Primary outcomes were intra-operative sufentanil consumption and verbal analogue scale (VAS) score at rest at 24h follow up. Results: Intra-operative sufentanil consumption was higher in the femoral block (FEM) group compared to the lumbar plexus block (PSOAS) group (FEM: 10.00 (10.00, 17.50) μg; PSOAS: 2.50 (0.00, 10.00) μg. p= 0.002). Obturator motor blockade occurred more frequently in the PSOAS group (70%) than in the FEM group (40%) (p=0.1); however, we found no differences in sensory blockade (p=0.6). VAS at rest was similar in the two groups at 24h postoperatively (FEM: 29.50 ± 14.74 mm; PSOAS: 25.60 ±17.42 mm. p=0.4), and throughout the follow-up period. No differences were detected in pain scores during physiotherapy. Conclusion: Continuous femoral and lumbar plexus blocks, both in association with sciatic nerve block, provided similar VAS scores at 24h, and throughout the follow-up period; intra-operative sufentanil consumption was, however, lower in the lumbar plexus block group