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https://www.readbyqxmd.com/read/29039773/a-review-of-statistical-failure-time-models-with-application-of-a-discrete-hazard-based-model-to-1cr1mo-0-25v-steel-for-turbine-rotors-and-shafts
#1
REVIEW
Mark Evans
Producing predictions of the probabilistic risks of operating materials for given lengths of time at stated operating conditions requires the assimilation of existing deterministic creep life prediction models (that only predict the average failure time) with statistical models that capture the random component of creep. To date, these approaches have rarely been combined to achieve this objective. The first half of this paper therefore provides a summary review of some statistical models to help bridge the gap between these two approaches...
October 17, 2017: Materials
https://www.readbyqxmd.com/read/29037892/hybrid-spheroids-incorporating-ecm-like-engineered-fragmented-fibers-potentiate-stem-cell-function-by-improved-cell-cell-and-cell-ecm-interactions
#2
Taufiq Ahmad, Jinkyu Lee, Young Min Shin, Hyeok Jun Shin, Sajeesh Kumar Madhurakat Perikamana, Sun Hwa Park, Sung Won Kim, Heungsoo Shin
Extracellular matrix (ECM) microenvironment is critical for the viability, stemness, and differentiation of stem cells. In this study, we developed hybrid-spheroids of human turbinate mesenchymal stem cells (hTMSCs) by using extracellular matrix (ECM) mimicking fragmented fibers (FFs) for improvement of the viability and functions of hTMSCs. We prepared FFs with average size of 68.26 µm by partial aminolysis of poly L-lactide (PLLA) fibrous sheet (FS), which was coated with polydopamine for improved cell adhesion...
October 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29034287/numerical-data-concerning-wind-farm-layout-optimization-using-differential-evolution-algorithm-at-different-wind-speeds
#3
Shafiq-Ur-Rehman Massan, Asim Imdad Wagan, Muhammad Mujtaba Shaikh, Muhammad Saleh Shah
In this work, the numerical data related to wind turbine micrositing problem is presented. The data is acquired using the differential evolution algorithm (DEA) at different wind speeds. The data obtained through DEA include total dissipated power, cost per installation of unit turbine, and the efficiency of algorithm after installation of any particular number turbines; and are depicted versus number of turbines. The data provided in this paper can be used directly without having to spend weeks of computational time to simulate the results; and can readily be used for comparison with other existing (Massan et al...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29022347/energy-efficiency-and-performance-limiting-effects-in-thermo-osmotic-energy-conversion-from-low-grade-heat
#4
Anthony P Straub, Menachem Elimelech
Low-grade heat energy from sources below 100 C is available in massive quantities around the world, but cannot be converted to electricity effectively using existing technologies due to variability in the heat output and the small temperature difference between the source and environment. The recently developed thermo-osmotic energy conversion (TOEC) process has the potential to harvest energy from low-grade heat sources by using a temperature difference to create a pressurized liquid flux across a membrane, which can be converted to mechanical work via a turbine...
October 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29019747/masses-of-the-nose-nasal-cavity-and-nasopharynx-in-children
#5
Diana P Rodriguez, Emily S Orscheln, Bernadette L Koch
A wide range of masses develop in the nose, nasal cavity, and nasopharynx in children. These lesions may arise from the nasal ala or other structures of the nose, including the mucosa covering any surface of the nasal cavity, the cartilaginous or osseous portion of the nasal septum, the nasal turbinates, and the nasal bones. Lesions may also arise from the nasopharynx or adjacent structures and involve the nose by way of direct extension. The causes of nasal masses in children include congenital and developmental disorders such as congenital nasolacrimal duct mucocele, dermoid cyst, cephalocele, and nasal neuroglial heterotopia; inflammatory and infectious processes such as mucocele, polyp, and pyogenic granuloma; benign neoplasms such as infantile hemangioma and juvenile nasopharyngeal angiofibroma; malignant lesions such as rhabdomyosarcoma and nasopharyngeal carcinoma; and masses related to prior trauma such as septal hematoma...
October 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29018500/computed-tomography-measurement-of-inferior-turbinate-in-asymptomatic-adult
#6
Mohammad Waheed El-Anwar, Atef A Hamed, Ghada Abdulmonaem, Ismail Elnashar, Inas M Elfiki
Introduction  The inferior turbinate (IT) is the most susceptible turbinate to enlargement causing nasal obstruction. The common belief ascribes most of the enlargement of the IT to mucosal elements. Objective  This study aimed to investigate the detailed computed tomography (CT) measurement of the IT in asymptomatic adult by determining the thickness of both the non-bony (mucosa) and bony parts and their relation to nasal air space in different related areas of the nose. Methods  We included in the study paranasal CT scans of 108 individuals (216 IT) that had no paranasal pathology...
October 2017: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/28990662/the-radioanatomy-of-endonasal-flap-coverage-of-skull-base-defects-a-tool-for-preoperative-planning
#7
Francisco J D MacArthur, Gerald W McGarry
OBJECTIVES/HYPOTHESIS: To develop a tool for the calculation of surgical skull base defects and endonasal flap dimensions on preoperative computed tomography (CT) to aid surgical planning. STUDY DESIGN: Case series. METHODS: A literature search was conducted to identify all endonasal flaps. There were five basic models identified. These are the nasoseptal flap, anterior lateral nasal wall flap, bipedicled anterior septal flap, posterior pedicled inferior turbinate flap, and middle turbinate flap...
October 9, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28988601/colonization-of-the-middle-turbinate
#8
C Djian, A-L Gaultier, S Chartier, O Laccourreye
No abstract text is available yet for this article.
October 2, 2017: European Annals of Otorhinolaryngology, Head and Neck Diseases
https://www.readbyqxmd.com/read/28982291/intranasal-melanoma-treated-with-radiation-therapy-in-three-dogs
#9
Owen Davies, Sarah Spencer, Slavomira Necova, Emma Holmes, Angela Taylor, Laura Blackwood, Ana Lara-Garcia
Three dogs were investigated for chronic unilateral nasal discharge. In all cases CT imaging showed an intranasal mass causing turbinate lysis and no evidence of metastasis. Cytology in cases 1 (a 14-year-old neutered male crossbreed dog) and 2 (a five-year-old neutered male German Shepherd dog) demonstrated a pleomorphic cell population with variable intracellular pigment suspicious of melanocytic neoplasia. Histopathology with immunohistochemistry (Melan-A and vimentin, plus PNL-2 in one case) confirmed the diagnosis of melanoma in all dogs...
October 6, 2017: Veterinary Quarterly
https://www.readbyqxmd.com/read/28981458/process-modeling-of-composite-materials-for-wind-turbine-rotor-blades-experiments-and-numerical-modeling
#10
Birgit Wieland, Sven Ropte
The production of rotor blades for wind turbines is still a predominantly manual process. Process simulation is an adequate way of improving blade quality without a significant increase in production costs. This paper introduces a module for tolerance simulation for rotor-blade production processes. The investigation focuses on the simulation of temperature distribution for one-sided, self-heated tooling and thick laminates. Experimental data from rotor-blade production and down-scaled laboratory tests are presented...
October 5, 2017: Materials
https://www.readbyqxmd.com/read/28980597/-the-original-method-for-the-endonasal-surgical-access-to-the-maxillary-sinus-through-crista-conchalis-of-the-maxillary-bone
#11
G Yu Tsarapkin, A S Tovmasyan, К M Fedotkina, E V Gorovaya, S G Arzamazov, S A Panasov
The objective of the present work was to develop a technique for the endonasal surgical access to the maxillary sinus through crista conchalis of the maxillary bone and to evaluate the effectiveness and safety of the surgical treatment by this method. A total of 210 patients underwent the CT-assisted examination of the paranasal sinuses. The data obtained made it possible to characterize the detailed anatomical structure of crista conchalis of a maxillary bone that forms the anterior part of the medial wall of the maxillary sinus...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28980594/-sintopy-of-the-distal-end-of-the-nasolacrimal-duct-detected-by-means-of-the-vector-analysis-of-the-ct-identified-anatomical-features-of-the-nasal-cavity
#12
G Yu Tsarapkin, A Yu Ivoylov, P L Chumakov, К M Fedotkina, E V Gorovaya, A V Artemieva-Karelova, E G Lapenko
The objective of the present work was to study syntopy of the distal end of the nasolacrimal duct based on the results of the vector analysis of the CT-identified anatomical features of the nasal cavity and the paranasal sinuses in 102 patients (204 nasolacrimal channels). The main criterion for inclusion in the study was the absence of traumatic injuries and inflammatory changes in the nasal cavity and the paranasal sinuses. X-ray studies of the distal end of the nasolacrimal duct (NLD), turbinate crest (crista conchalis), the edge of the nasal aperture, and the floor of the nasal cavity were carried out...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28975810/eustachian-tube-dysfunction-related-symptoms-in-chronic-nasal-obstruction-caused-by-inferior-turbinate-enlargement
#13
Teemu Harju, Ilkka Kivekäs, Jura Numminen, Markus Rautiainen
OBJECTIVE: The aim of this study was to evaluate the relationship between chronic nasal obstruction caused by inferior turbinate enlargement and Eustachian tube dysfunction-related symptoms using the Eustachian Tube Dysfunction Questionnaire (ETDQ-7) as an assessment method. METHODS: A total of 80 adults were enrolled. Group 1 comprised consecutive patients with enlarged inferior turbinates and group 2 comprised healthy controls. The ETDQ-7 scores and tympanometry results of both groups were analyzed and compared...
October 1, 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28972925/interactive-3d-geodesign-tool-for-multidisciplinary-wind-turbine-planning
#14
Azarakhsh Rafiee, Pim Van der Male, Eduardo Dias, Henk Scholten
Wind turbine site planning is a multidisciplinary task comprising of several stakeholder groups from different domains and with different priorities. An information system capable of integrating the knowledge on the multiple aspects of a wind turbine plays a crucial role on providing a common picture to the involved groups. In this study, we have developed an interactive and intuitive 3D system (Falcon) for planning wind turbine locations. This system supports iterative design loops (wind turbine configurations), based on the emerging field of geodesign...
September 30, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28972548/full-scale-fatigue-testing-of-a-wind-turbine-blade-in-flapwise-direction-and-examining-the-effect-of-crack-propagation-on-the-blade-performance
#15
Othman Al-Khudairi, Homayoun Hadavinia, Christian Little, Gavin Gillmore, Peter Greaves, Kirsten Dyer
In this paper, the sensitivity of the structural integrity of wind turbine blades to debonding of the shear web from the spar cap was investigated. In this regard, modal analysis, static and fatigue testing were performed on a 45.7 m blade for three states of the blade: (i) as received blade (ii) when a crack of 200 mm was introduced between the web and the spar cap and (iii) when the crack was extended to 1000 mm. Calibration pull-tests for all three states of the blade were performed to obtain the strain-bending moment relationship of the blade according to the estimated target bending moment (BM) which the blade is expected to experience in its service life...
October 3, 2017: Materials
https://www.readbyqxmd.com/read/28968494/sourcing-of-steam-and-electricity-for-carbon-capture-retrofits
#16
Sarang D Supekar, Steven J Skerlos
This paper compares different steam and electricity sources for carbon capture and sequestration (CCS) retrofits of pulverized coal (PC) and natural gas combined cycle (NGCC) power plants. Analytical expressions for the thermal efficiency of these power plants are derived under 16 different CCS retrofit scenarios for the purpose of illustrating their environmental and economic characteristics. The scenarios emerge from combinations of steam and electricity sources, fuel used in each source, steam generation equipment and process details, and the extent of CO2 capture...
October 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28966337/influences-of-low-frequency-and-other-noises-produced-by-wind-turbines-an-epidemiological-literature-review
#17
Tatsuhiko Kubo, Hideki Hasunuma, Yoshitaka Morimatsu, Yoshihisa Fujino, Kunio Hara, Tatsuya Ishitake
Objectives Due to its' environment-friendly and clean energy characteristics, wind power has been increasingly used globally, particularly in advanced countries. However, concerns about health hazards, especially due to low-frequency and other noises generated from wind turbines, have been reported repeatedly. In order to manage adverse health effects appropriately, regulatory standards or guidelines that consider the health of residents need to be developed. To provide a scientific basis for the development of such regulatory standards and guidelines, this paper conducted a literature review to analyze epidemiological studies involving residents living in the vicinity of wind farms...
2017: [Nihon Kōshū Eisei Zasshi] Japanese Journal of Public Health
https://www.readbyqxmd.com/read/28964664/comparison-of-emla-cream-and-lidocaine-injection-for-local-anaesthetic-before-radiofrequency-reduction-of-the-inferior-turbinates
#18
N Ata, T Bülbül, A Demirkan
We compared the effectiveness of local anaesthetic with Emla cream with that of an injection of lidocaine for radiofrequency reduction of the inferior turbinates. We studied 98 consecutive patients with hypertrophied inferior turbinates, 46 of whom were given Emla cream and 52 lidocaine injection. The procedure began five minutes after the injection of lidocaine and 10minutes after the Emla cream had been applied. Patients were asked to indicate on a visual analogue scale (VAS) the degree of perioperative pain, anxiety, sensation of choking, and discomfort on swallowing that they felt after the procedure...
September 27, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28964297/paediatric-endonasal-dacryocystorhinostomy-using-an-otology-set-how-i-do-it
#19
Hetal Marfatia, Keya Shah, Asmita Madhavi, Yogesh Parmar
INTRODUCTION: Endonasal DCR is safely performed in children presenting with persistent epiphora, not responding to conservative management. The surgical technique of endoscopic DCR in the paediatric age group essentially remains the same as that performed in adults, but children have narrower nasal passages and relatively larger inferior turbinates which limit the surgeon's working space. The standard 2.7 mm paediatric nasal endoscope gives a smaller surgical work field as compared to the 4 mm adult endoscope...
October 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28961099/mri-guided-robotically-assisted-focal-laser-ablation-of-the-prostate-using-canine-cadavers
#20
Yue Chen, Sheng Xu, Alexander Squires, Reza Seifabadi, Ismail Baris Turkbey, Peter Pinto, Peter Choyke, Bradford Wood, Zion Tsz Ho Tse
OBJECTIVE: A Magnetic Resonance Imaging (MRI)-conditional needle guidance robot is developed to enhance MRI-guided Focal Laser Ablation (FLA) therapy in patients with focal prostate cancer. METHODS: Inspired by the workflow of the manual FLA therapy, we developed an MRI-conditional robot with two degrees of freedom (DoF) to provide the guidance for laser ablation catheter. This robot is powered by pneumatic turbine motors and encoded with the custom-designed optical encoder...
September 26, 2017: IEEE Transactions on Bio-medical Engineering
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