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https://www.readbyqxmd.com/read/27902712/is-there-a-future-for-nuclear-power-wind-and-emission-reduction-targets-in-fossil-fuel-alberta
#1
G Cornelis van Kooten, Jun Duan, Rachel Lynch
This paper explores the viability of relying on wind power to replace upwards of 60% of electricity generation in Alberta that would be lost if coal-fired generation is phased out. Using hourly wind data from 17 locations across Alberta, we are able to simulate the potential wind power output available to the Alberta grid when modern, 3.5 MW-capacity wind turbines are spread across the province. Using wind regimes for the years 2006 through 2015, we find that available wind power is less than 60% of installed capacity 98% of the time, and below 30% of capacity 74% of the time...
2016: PloS One
https://www.readbyqxmd.com/read/27894699/fault-diagnosis-for-wind-turbine-planetary-ring-gear-via-a-meshing-resonance-based-filtering-algorithm
#2
Tianyang Wang, Fulei Chu, Qinkai Han
Identifying the differences between the spectra or envelope spectra of a faulty signal and a healthy baseline signal is an efficient planetary gearbox local fault detection strategy. However, causes other than local faults can also generate the characteristic frequency of a ring gear fault; this may further affect the detection of a local fault. To address this issue, a new filtering algorithm based on the meshing resonance phenomenon is proposed. In detail, the raw signal is first decomposed into different frequency bands and levels...
November 25, 2016: ISA Transactions
https://www.readbyqxmd.com/read/27888644/myrtol-standardized-affects-mucociliary-clearance
#3
Ying Ying Li, Jing Liu, Chun Wei Li, Somasundaram Subramaniam, Siew Shuen Chao, Feng Gang Yu, Noam A Cohen, Shi Li, Yun Wang
BACKGROUND: Myrtol standardized (Gelomyrtol forte) has been shown to be effective in controlling nasal symptoms of rhinosinusitis by promoting mucociliary clearance. Our aim was to evaluate the short- and long-term effects of myrtol on ciliated columnar cells and goblet cells in an in-vitro setting. METHODS: Nasal epithelial cells were harvested (42 days) from an air-liquid interface (ALI) culture of human nasal epithelial stem/progenitor cells (hNESPCs), which was derived from biopsies of nasal inferior turbinate mucosa...
November 26, 2016: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/27886051/a-laminar-flow-based-microfluidic-tesla-pump-via-lithography-enabled-3d-printing
#4
Mohammed-Baker Habhab, Tania Ismail, Joe Fujiou Lo
Tesla turbine and its applications in power generation and fluid flow were demonstrated by Nicholas Tesla in 1913. However, its real-world implementations were limited by the difficulty to maintain laminar flow between rotor disks, transient efficiencies during rotor acceleration, and the lack of other applications that fully utilize the continuous flow outputs. All of the aforementioned limits of Tesla turbines can be addressed by scaling to the microfluidic flow regime. Demonstrated here is a microscale Tesla pump designed and fabricated using a Digital Light Processing (DLP) based 3D printer with 43 µm lateral and 30 µm thickness resolutions...
November 23, 2016: Sensors
https://www.readbyqxmd.com/read/27876739/-the-state-of-the-nasal-mucosa-and-the-paranasal-sinuses-in-the-late-postoperative-period-following-radical-and-minimally-invasive-surgery
#5
M M Magomedov, D F Zeinalova, D V Andriyashkin, N M Magomedova, A E Starostina, M V Zvereva
We have investigated the functional state of the mucous membrane of the nasal cavity and maxillary sinus after radical and minimally invasive surgical procedures during the log-term postoperative period, i.e. three and more months after the intervention. The materials for the study were brushings and histological biopsies; in addition, the functional parameters of the mucous membranes of the nose and maxillary sinuses were estimated before and after surgery. It has been found that the type of the surgical intervention on the inferior turbinate bones for the treatment of chronic rhinitis, such as gentle turbinotomy, has no significant influence on the state of the mucous membrane...
2016: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/27875195/in-situ-distribution-guided-analysis-and-visualization-of-transonic-jet-engine-simulations
#6
Soumya Dutta, Chun-Ming Chen, Gregory Heinlein, Han-Wei Shen, Jen-Ping Chen
Study of flow instability in turbine engine compressors is crucial to understand the inception and evolution of engine stall. Aerodynamics experts have been working on detecting the early signs of stall in order to devise novel stall suppression technologies. A state-of-the-art Navier-Stokes based, time-accurate computational fluid dynamics simulator, TURBO, has been developed in NASA to enhance the understanding of flow phenomena undergoing rotating stall. Despite the proven high modeling accuracy of TURBO, the excessive simulation data prohibits post-hoc analysis in both storage and I/O time...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27874007/phase-transformation-strengthening-of-high-temperature-superalloys
#7
T M Smith, B D Esser, N Antolin, A Carlsson, R E A Williams, A Wessman, T Hanlon, H L Fraser, W Windl, D W McComb, M J Mills
Decades of research has been focused on improving the high-temperature properties of nickel-based superalloys, an essential class of materials used in the hot section of jet turbine engines, allowing increased engine efficiency and reduced CO2 emissions. Here we introduce a new 'phase-transformation strengthening' mechanism that resists high-temperature creep deformation in nickel-based superalloys, where specific alloying elements inhibit the deleterious deformation mode of nanotwinning at temperatures above 700 °C...
November 22, 2016: Nature Communications
https://www.readbyqxmd.com/read/27873326/complications-of-turbinate-reduction-surgery-in-combination-with-tonsillectomy-in-pediatric-patients
#8
Sonia N Yuen, Peggy P Leung, Jamie Funamura, Kosuke Kawai, David W Roberson, Eelam A Adil
OBJECTIVES/HYPOTHESIS: To examine whether the addition of turbinoplasty to tonsillectomy and adenoidectomy (T&A) increases the risk of postoperative complications. STUDY DESIGN: Retrospective cohort study of children (18 years old and younger) who underwent tonsillectomy and/or turbinoplasty between July 1, 2013 and June 30, 2015 using the 2016 Pediatric Health Information System administrative database METHODS: Patients were divided into three groups: 1) T&A and turbinoplasty, 2) T&A alone, and 3) turbinoplasty alone...
November 22, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27872902/wind-energy-potential-assessment-of-cameroon-s-coastal-regions-for-the-installation-of-an-onshore-wind-farm
#9
Nkongho Ayuketang Arreyndip, Ebobenow Joseph, Afungchui David
For the future installation of a wind farm in Cameroon, the wind energy potentials of three of Cameroon's coastal cities (Kribi, Douala and Limbe) are assessed using NASA average monthly wind data for 31 years (1983-2013) and compared through Weibull statistics. The Weibull parameters are estimated by the method of maximum likelihood, the mean power densities, the maximum energy carrying wind speeds and the most probable wind speeds are also calculated and compared over these three cities. Finally, the cumulative wind speed distributions over the wet and dry seasons are also analyzed...
November 2016: Heliyon
https://www.readbyqxmd.com/read/27863637/nasal-septal-abscess-in-association-with-pediatric-acute-rhinosinusitis
#10
REVIEW
Duc A Tien, Paul Krakovitz, Samantha Anne
INTRODUCTION: Nasal septal abscess (NSA) in the pediatric population is rare and can result in devastating complications. Objective of this study is to review a case series of pediatric patients presenting with NSA in association with acute rhinosinusitis (ARS) for possible risk factors and predisposing conditions. METHOD: This is a retrospective review of pediatric patients that presented to a tertiary care hospital with nasal septal abscess associated with ARS...
December 2016: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/27863117/unique-turbinal-morphology-in-horseshoe-bats-chiroptera-rhinolophidae
#11
Abigail A Curtis, Nancy B Simmons
The mammalian nasal fossa contains a set of delicate and often structurally complex bones called turbinals. Turbinals and associated mucosae function in regulating respiratory heat and water loss, increasing surface area for olfactory tissue, and directing airflow within the nasal fossa. We used high-resolution micro-CT scanning to investigate a unique maxilloturbinal morphology in thirty-seven species from the bat family Rhinolophidae, which we compared with those of families Hipposideridae, Megadermatidae, and Pteropodidae...
November 14, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27861945/rapid-hemostasis-in-a-sheep-model-using-particles-that-propel-thrombin-and-tranexamic-acid
#12
James R Baylis, Andres Finkelstein-Kulka, Luis Macias-Valle, Jamil Manji, Michael Lee, Elina Levchenko, Christopher Okpaleke, Salahuddin Al-Salihi, Amin Javer, Christian J Kastrup
OBJECTIVES/HYPOTHESIS: Bleeding during endoscopic sinus surgery and open surgeries can easily obstruct the surgeons' field of view and increase morbidity and risk of intraoperative complications. Intraoperative bleeding could potentially be addressed by a hemostatic agent that safely disperses itself through the escaping blood. We tested the safety and efficacy of a self-propelling formulation of thrombin and tranexamic acid (SPTT) in stopping bleeding in a paranasal sinus injury and in an open surgical carotid injury sheep model...
November 10, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27857874/minimizing-septectomy-for-endoscopic-transsphenoidal-approaches-to-the-sellar-and-suprasellar-regions-a-cadaveric-morphometric-study
#13
Hermes G Garcia, Marc Otten, Marc Pyfer, Saurabh J Singhal, Alfred Marc Iloreta, Varun R Kshettry, Christopher J Farrell, Gurston Nyquist, Marc Rosen, James J Evans
The purpose of this study was to evaluate the effect of posterior septectomy size on surgical exposure and surgical freedom during the endoscopic transsphenoidal approach to the sella and parasellar region. Dissections were performed on 10 embalmed cadaver heads. Dissections started with wide bilateral sphenoidotomies, lateralization of middle turbinates, and a 5-mm posterior septectomy. The posterior septectomy was increased in 5-mm increments to a maximum of 35 mm, followed by bilateral middle turbinectomies...
December 2016: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/27857872/the-lamb-s-head-as-a-model-for-surgical-skills-development-in-endonasal-surgery
#14
Luíza Baptista Mallmann, Otávio Bejzman Piltcher, Gustavo Rassier Isolan
Objectives To test the viability of a lamb's head model for sinonasal surgery training in Brazil by comparing performance of endoscopic procedures in the septum and inferior turbinates. Design Prospective study. Settings Universidade Federal do Rio Grande do Sul (2015). Participants Ten physicians performed septoplasty, inferior turbinoplasty, and middle turbinectomy on 30 lamb's heads. Main Outcome Measures Degree of difficulty and similarity, opinion of tissue color and texture, and degree of satisfaction...
December 2016: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/27856037/itaipu-royalties-the-role-of-the-hydroelectric-sector-in-water-resource-management
#15
Alexandre Simões Lorenzon, Carlos Antonio Alvares Soares Ribeiro, Alexandre Rosa Dos Santos, Gustavo Eduardo Marcatti, Getulio Fonseca Domingues, Vicente Paulo Soares, Nero Lemos Martins de Castro, Thaisa Ribeiro Teixeira, Sady Júnior Martins da Costa de Menezes, Elias Silva, Kelly de Oliveira Barros, Gleissy Mary Amaral Dino Alves Dos Santos, Samuel Ferreira da Silva, Pedro Henrique Santos Mota
For countries dependent on hydroelectricity, water scarcity poses a real risk. Hydroelectric plants are among the most vulnerable enterprises to climate change. Investing in the conservation of the hydrographic basin is a solution found by the hydropower sector. Given the importance of the Itaipu plant to the energy matrix of Brazil and Paraguay, the aim of this study is to review the current distribution of royalties from Itaipu, using the hydrographic basin as a of criterion of analysis. Approximately 98...
November 14, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27849587/wind-speed-reductions-by-large-scale-wind-turbine-deployments-lower-turbine-efficiencies-and-set-low-generation-limits
#16
Lee M Miller, Axel Kleidon
Wind turbines generate electricity by removing kinetic energy from the atmosphere. Large numbers of wind turbines are likely to reduce wind speeds, which lowers estimates of electricity generation from what would be presumed from unaffected conditions. Here, we test how well wind power limits that account for this effect can be estimated without explicitly simulating atmospheric dynamics. We first use simulations with an atmospheric general circulation model (GCM) that explicitly simulates the effects of wind turbines to derive wind power limits (GCM estimate), and compare them to a simple approach derived from the climatological conditions without turbines [vertical kinetic energy (VKE) estimate]...
November 29, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27847736/correlations-between-anatomic-variations-of-maxillary-sinus-ostium-and-postoperative-complication-after-sinus-lifting
#17
Jang Won Lee, Ji Yong Yoo, Seung Jae Paek, Won-Jong Park, Eun Joo Choi, Moon-Gi Choi, Kyung-Hwan Kwon
OBJECTIVES: The maxillary sinus mucosa is reported to recover to preoperative sterility after sinus floor elevation. However, when drainage of maxillary sinus is impaired, recovery can be delayed and maxillary sinusitis can occur. Therefore, in this study, we investigated the correlations between anatomic variants that can interrupt the ostium of the maxillary sinus and incidence of complication after sinus lifting. MATERIALS AND METHODS: The subjects are 81 patients who underwent sinus lifting in Wonkwang University Dental Hospital (Iksan, Korea)...
October 2016: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/27844224/minimally-invasive-medial-maxillectomy-and-the-position-of-nasolacrimal-duct-the-ct-study
#18
Andrzej Sieskiewicz, Krzysztof Buczko, Jacek Janica, Adam Lukasiewicz, Urszula Lebkowska, Bartosz Piszczatowski, Ewa Olszewska
Several minimally invasive modifications of endoscopic medial maxillectomy have been proposed recently, with the least traumatic techniques utilizing the lacrimal recess as a route to enter the sinus. The aim of the study was to analyze the anatomy of medial maxillary wall in the region of nasolacrimal canal and, thus, to determine the capability of performing minimally invasive approach to the maxillary sinus leading through the lacrimal recess. The course of nasolacrimal canal and the distance between the anterior maxillary wall and the nasolacrimal canal (the width of lacrimal recess) were evaluated in 125 randomly selected computed tomography (CT) head examinations...
November 14, 2016: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27833866/long-term-outcomes-of-radiofrequency-ablation-of-the-inferior-turbinates
#19
Casey Means, Macario Camacho, Robson Capasso
Radiofrequency ablation of the inferior turbinates (RFAIT) is a minimally invasive surgical technique that reduces turbinate size and decreases nasal obstruction. Few studies have assessed long-term outcomes of this procedure using standardized, symptom-specific evaluation instruments. The primary aim of this study is to assess the long-term effectiveness of RFAIT using a standardized, symptom-specific evaluation instrument. An additional outcome evaluated is the effect of RFAIT on therapeutic CPAP pressures in centimetres of water pressure (cwp) and overall CPAP use...
December 2016: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/27832338/the-status-of-the-middle-turbinate-and-the-risk-of-sinusitis-after-endoscopic-transnasal-sphenoidotomy
#20
Ahmet Emre Süslü, Özden Savaş, Serdar Özer, Metin Önerci
The objectives of this study are to evaluate the occurrence of postoperative middle turbinate lateralization and the relationship between this lateralization and the risk of iatrogenic sinusitis after endoscopic transnasal sphenoidotomy procedure. Patients who undergone endoscopic transnasal sphenoidotomy and came under the surveillance of our otorhinolaryngology department between the January of 2010 and the December of 2015 were retrospectively scanned. Among them, the patients who were evaluated with paranasal sinus computed tomography (CT) postoperatively were included in the study...
November 10, 2016: European Archives of Oto-rhino-laryngology
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