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https://www.readbyqxmd.com/read/29144436/an-in-silico-subject-variability-study-of-upper-airway-morphological-influence-on-the-airflow-regime-in-a-tracheobronchial-tree
#1
Yu Feng, Jianan Zhao, Xiaole Chen, Jiang Lin
Determining the impact of inter-subject variability on airflow pattern and nanoparticle deposition in the human respiratory system is necessary to generate population-representative models, useful for several biomedical engineering applications. Thus, the overall research objective is to quantitatively correlate geometric parameters and coupled transport characteristics of air, vapor, and nanoparticles. Focusing on identifying morphological parameters that significantly influence airflow field and nanoparticle transport, an experimentally validated computational fluid-particle dynamics (CFPD) model was employed to simulate airflow pattern in three human lung-airway configurations...
November 16, 2017: Bioengineering
https://www.readbyqxmd.com/read/29138444/the-elusive-evidence-of-volcanic-lightning
#2
K Genareau, P Gharghabi, J Gafford, M Mazzola
Lightning strikes are known to morphologically alter and chemically reduce geologic formations and deposits, forming fulgurites. A similar process occurs as the result of volcanic lightning discharge, when airborne volcanic ash is transformed into lightning-induced volcanic spherules (LIVS). Here, we adapt the calculations used in previous studies of lightning-induced damage to infrastructure materials to determine the effects on pseudo-ash samples of simplified composition. Using laboratory high-current impulse experiments, this research shows that within the lightning discharge channel there is an ideal melting zone that represents roughly 10% or less of the total channel radius at which temperatures are sufficient to melt the ash, regardless of peak current...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29136194/fast-skin-dose-estimation-system-for-interventional-radiology
#3
Takeshi Takata, Jun'ichi Kotoku, Hideyuki Maejima, Shinobu Kumagai, Norikazu Arai, Takenori Kobayashi, Kenshiro Shiraishi, Masayoshi Yamamoto, Hiroshi Kondo, Shigeru Furui
To minimise the radiation dermatitis related to interventional radiology (IR), rapid and accurate dose estimation has been sought for all procedures. We propose a technique for estimating the patient skin dose rapidly and accurately using Monte Carlo (MC) simulation with a graphical processing unit (GPU, GTX 1080; Nvidia Corp.). The skin dose distribution is simulated based on an individual patient's computed tomography (CT) dataset for fluoroscopic conditions after the CT dataset has been segmented into air, water and bone based on pixel values...
November 10, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/29135232/confocal-raman-microscopy-for-the-determination-of-protein-and-quaternary-ammonium-ion-loadings-in-biocatalytic-membranes-for-electrochemical-energy-conversion-and-storage
#4
Rong Cai, Sofiene Abdellaoui, Jay P Kitt, Cullen Irvine, Joel Harris, Shelley D Minteer, Carol Korzeniewski
The need to immobilize active enzyme, while ensuring high rates of substrate turnover and electronic charge transfer with an electrode, is a centrally important challenge in the field of bioelectrocatalysis. In this work, we demonstrate the use of confocal Raman microscopy as a tool for quantitation and molecular-scale structural characterization of ionomers and proteins within biocatalytic membranes to aid in the development of energy efficient biofuel cells. A set of recently available short side chain Aquivion ionomers spanning a range of equivalent weight (EW) suitable for enzyme immobilization was investigated...
November 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29135219/room-temperature-and-solution-processable-cu-doped-nickel-oxide-nanoparticles-for-efficient-hole-transport-layers-of-flexible-large-area-perovskite-solar-cells
#5
Qiqi He, Kai Yao, Xiaofeng Wang, Xuefeng Xia, Shifeng Leng, Fan Li
Flexible perovskite solar cells (PeSCs) using plastic substrates have become one of the most attractive points in the field of thin film solar cells. Low-temperature and solution-processable nanoparticles enable the fabrication of semiconductor thin films in a simple and low cost approach to function as charge-selective layers in flexible PeSCs. Here, we synthesized phase-pure p-type Cu-doped NiOx nanoparticles (NPs) with good electrical properties, which can be processed to smooth, pinhole-free and efficient hole transport layers (HTLs) with large-area uniformity over a wide range of film thickness using the room-temperature solution-processing technique...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29134105/global-network-centrality-of-university-rankings
#6
Weisi Guo, Marco Del Vecchio, Ganna Pogrebna
Universities and higher education institutions form an integral part of the national infrastructure and prestige. As academic research benefits increasingly from international exchange and cooperation, many universities have increased investment in improving and enabling their global connectivity. Yet, the relationship of university performance and its global physical connectedness has not been explored in detail. We conduct, to our knowledge, the first large-scale data-driven analysis into whether there is a correlation between university relative ranking performance and its global connectivity via the air transport network...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29134092/enhanced-photovoltaic-properties-of-perovskite-solar-cells-by-tio2-homogeneous-hybrid-structure
#7
Pengyu Su, Wuyou Fu, Huizhen Yao, Li Liu, Dong Ding, Fei Feng, Shuang Feng, Yebin Xue, Xizhe Liu, Haibin Yang
In this paper, we fabricated a TiO2 homogeneous hybrid structure for application in perovskite solar cells (PSCs) under ambient conditions. Under the standard air mass 1.5 global (AM 1.5G) illumination, PSCs based on homogeneous hybrid structure present a maximum power conversion efficiency of 5.39% which is higher than that of pure TiO2 nanosheets. The enhanced properties can be explained by the better contact of TiO2 nanosheets/nanoparticles with CH3NH3PbI3 and fewer pinholes in electron transport materials...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133253/the-oxidative-stress-and-antioxidant-responses-of-live-chinese-shrimp-fenneropenaeuschinensis-to-low-temperature-and-air-exposure
#8
Zihan Xu, Joe M Regenstein, Dandan Xie, Wenjing Lu, Xingchen Ren, Jiajia Yuan, Linchun Mao
Low temperature and air exposure were the key attributes for waterless transportation of fish and shrimp. In order to investigate the oxidative stress and antioxidant responses of the live shrimp Fenneropenaeuschinensis in the mimic waterless transportation, live Chinese shrimp were cooled at 13 °C for 3 min, stored in oxygen at 15 °C for 12 h, and then revived in water at 25 °C. The survival rate of shrimp under this waterless transportation system was over 86.67%. The ultrastructure of hepatopancreas cells were observed while activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), glutathione peroxidase (GSH-Px), antisuperoxide anion free radicals (ASAFR), total antioxidant capacity (TAOC), reactive oxygen species (ROS) production, content of malondialdehyde (MDA) and relative mRNA expressions of CAT and GSH-Px in the hemolymph and hepatopancreas were determined...
November 10, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29132595/remote-ecls-implantation-and-transport-for-retrieval-of-cardiogenic-shock-patients
#9
Sabina P W Guenther, Stefan Buchholz, Frank Born, Stefan Brunner, René Schramm, Dominik J Hoechter, Vera von Dossow, Maximilian Pichlmaier, Christian Hagl, Nawid Khaladj
OBJECTIVE: Extracorporeal life support (ECLS) emerges as a salvage option in therapy refractory cardiogenic shock but is limited to highly specialized tertiary care centers. Critically ill patients are often too unstable for conventional transport. Mobile ECLS programs for remote implantation and subsequent air or ground-based transport for patient retrieval could solve this dilemma and make full-spectrum advanced cardiac care available to patients in remote hospitals in whom shock otherwise might be fatal...
November 2017: Air Medical Journal
https://www.readbyqxmd.com/read/29132594/ketamine-sedation-for-patients-with-acute-behavioral-disturbance-during-aeromedical-retrieval-a-retrospective-chart-review
#10
Vinay Gangathimmaiah, Minh Le Cong, Mike Wilson, Kate Hooper, Andrew Perry, Luke Burman, Nathan Puckeridge, Brian J Maguire
OBJECTIVE: The aim of this study was to determine the prevalence, safety (as measured by the incidence of adverse events), and effectiveness (as measured by the incidence of intubations) of ketamine sedation in patients with acute behavioral disturbance (ABD) during air medical retrieval. METHODS: This was a retrospective observational study. Eligible patients were identified by searching the electronic databases of 2 air medical retrieval services in Queensland, Australia, for adult patients with ABD transported between January 1, 2015, and June 30, 2016...
November 2017: Air Medical Journal
https://www.readbyqxmd.com/read/29132593/the-impact-of-helicopter-emergency-medical-service-night-operations-in-south-east-england
#11
Leigh Curtis, Mark Salmon, Richard M Lyon
OBJECTIVE: This study sought to assess the impact of a helicopter emergency medical service (HEMS) capable of night operations. METHODS: This is a retrospective case review of all night HEMS missions attended by a charity air ambulance service in South East England over a 2-year period (October 1, 2013, to October 1, 2015). RESULTS: During the 2-year trial period, the HEMS service undertook a total of 5,004 missions and attended to 3,728 patients...
November 2017: Air Medical Journal
https://www.readbyqxmd.com/read/29128689/simulating-the-mesoscale-transport-of-krypton-85
#12
Anne Felsberg, J Ole Ross, Clemens Schlosser, Gerald Kirchner
Due to its half-life, chemical inertness and low solubility in water, radioactive (85)Kr is a valuable tracer for testing the performance of atmospheric dispersion models in simulating long-range transport of pollutants. This paper evaluates the capability of simulating the dispersion of radiokrypton emitted by a nuclear fuel reprocessing plant in north-west France. Three time periods during which elevated activity concentrations of (85)Kr in ground level air were detected in south-west Germany are chosen. Simulations have been performed using the HYSPLIT code and the European Centre for Median-Range Weather Forecasts (ECMWF) data base...
November 9, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29128244/source-apportionment-of-secondary-organic-aerosol-in-china-using-a-regional-source-oriented-chemical-transport-model-and-two-emission-inventories
#13
Peng Wang, Qi Ying, Hongliang Zhang, Jianlin Hu, Yingchao Lin, Hongjun Mao
A Community Multiscale Air Quality (CMAQ) model with source-oriented lumped SAPRC-11 (S11L) photochemical mechanism and secondary organic aerosol (SOA) module was applied to determine the contributions of anthropogenic and biogenic sources to SOA concentrations in China. A one-year simulation of 2013 using the Multi-resolution Emission Inventory for China (MEIC) shows that summer SOA are generally higher (10-15 μg m(-3)) due to large contributions of biogenic (country average 60%) and industrial sources (17%)...
November 8, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29127869/trans-boundary-air-pollution-in-a-city-under-various-atmospheric-conditions
#14
Ming Luo, Xiangting Hou, Yefu Gu, Ngar-Cheung Lau, Steve Hung-Lam Yim
Trans-boundary air pollution (TAP) is a crucial factor affecting air quality, and its contribution may vary over time and differ under various atmospheric conditions. This study firstly applies an integrated statistical scheme to estimate the contributions of TAP and local sources to air pollutants in a city, and then investigate the influences of tropical cyclones (TC) on TAP. Hong Kong is chosen as an example because of its significant and special TAP characteristics. This study focuses on four major air pollutants, namely, respirable and fine suspended particulates (RSP/PM10 and FSP/PM2...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29126093/temporal-spatial-characteristics-and-source-apportionment-of-pm2-5-as-well-as-its-associated-chemical-species-in-the-beijing-tianjin-hebei-region-of-china
#15
Jiajia Gao, Kun Wang, Yong Wang, Shuhan Liu, Chuanyong Zhu, Jiming Hao, Huanjia Liu, Shenbing Hua, Hezhong Tian
PM2.5 and its major chemical compositions were sampled and analyzed in January, April, July and October of 2014 at Beijing (BJ), Tianjin (TJ), Langfang (LF) and Baoding (BD) in order to probe the temporal and spatial characteristics as well as source apportionment of PM2.5 in the Beijing-Tianjin-Hebei (BTH) region. The results showed that PM2.5 pollution was severe in the BTH region. The average annual concentrations of PM2.5 at four sampling sites were in the range of 126-180 μg/m(3), with more than 95% of sampling days exceeding 35 μg/m(3), the limit ceiling of average annual concentration of PM2...
November 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29125614/bubble-propagation-on-a-rail-a-concept-for-sorting-bubbles-by-size
#16
Andrés Franco-Gómez, Alice B Thompson, Andrew L Hazel, Anne Juel
We demonstrate experimentally that the introduction of a rail, a small height constriction, within the cross-section of a rectangular channel could be used as a robust passive sorting device in two-phase fluid flows. Single air bubbles carried within silicone oil are generally transported on one side of the rail. However, for flow rates marginally larger than a critical value, a narrow band of bubble sizes can propagate (stably) over the rail, while bubbles of other sizes segregate to the side of the rail. The width of this band of bubble sizes increases with flow rate and the size of the most stable bubble can be tuned by varying the rail width...
November 10, 2017: Soft Matter
https://www.readbyqxmd.com/read/29124846/prevalence-mechanisms-and-genetic-relatedness-of-the-human-pathogenic-fungus-aspergillus-fumigatus-exhibiting-resistance-to-medical-azoles-in-the-environment-of-taiwan
#17
Hsuan-Chen Wang, Jui-Chang Huang, Yong-Hong Lin, Yu-Hsin Chen, Ming-I Hsieh, Pui-Ching Choi, Hsiu-Jung Lo, Wei-Lun Liu, Ching-Shan Hsu, Hsin-I Shih, Chi-Jung Wu, Yee-Chun Chen
Emerging azole resistance in Aspergillus fumigatus poses a serious threat to human health. This nationwide surveillance study investigated the prevalence and molecular characteristics of azole-resistant A. fumigatus environmental isolates in Taiwan, an island country with increasing use of azole fungicides. Of the 2,760 air and soil samples screened from 2014-2016, 451 A. fumigatus isolates were recovered from 266 samples, and 34 isolates from 29 samples displayed resistance to medical azoles (itraconazole, voriconazole, or posaconazole)...
November 10, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29122347/stable-and-radioactive-cesium-a-review-about-distribution-in-the-environment-uptake-and-translocation-in-plants-plant-reactions-and-plants-potential-for-bioremediation
#18
REVIEW
Anna Burger, Irene Lichtscheidl
Radiocesium in water, soil, and air represents a severe threat to human health and the environment. It either acts directly on living organisms from external sources, or it becomes incorporated through the food chain, or both. Plants are at the base of the food chain; it is therefore essential to understand the mechanisms of plants for cesium retention and uptake. In this review we summarize investigations about sources of stable and radioactive cesium in the environment and harmful effects caused by internal and external exposure of plants to radiocesium...
November 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29121096/personal-exposure-to-fine-particulate-air-pollution-while-commuting-an-examination-of-six-transport-modes-on-an-urban-arterial-roadway
#19
Robert A Chaney, Chantel D Sloan, Victoria C Cooper, Daniel R Robinson, Nathan R Hendrickson, Tyler A McCord, James D Johnston
Traffic-related air pollution in urban areas contributes significantly to commuters' daily PM2.5 exposures, but varies widely depending on mode of commuting. To date, studies show conflicting results for PM2.5 exposures based on mode of commuting, and few studies compare multiple modes of transportation simultaneously along a common route, making inter-modal comparisons difficult. In this study, we examined breathing zone PM2.5 exposures for six different modes of commuting (bicycle, walking, driving with windows open and closed, bus, and light-rail train) simultaneously on a single 2...
2017: PloS One
https://www.readbyqxmd.com/read/29121067/high-yields-of-hydrogen-production-from-methanol-steam-reforming-with-a-cross-u-type-reactor
#20
Shubin Zhang, Yufeng Zhang, Junyu Chen, Xuelin Zhang, Xiaowei Liu
This paper presents a numerical and experimental study on the performance of a methanol steam reformer integrated with a hydrogen/air combustion reactor for hydrogen production. A CFD-based 3D model with mass and momentum transport and temperature characteristics is established. The simulation results show that better performance is achieved in the cross-U type reactor compared to either a tubular reactor or a parallel-U type reactor because of more effective heat transfer characteristics. Furthermore, Cu-based micro reformers of both cross-U and parallel-U type reactors are designed, fabricated and tested for experimental validation...
2017: PloS One
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