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https://www.readbyqxmd.com/read/28443889/the-passivating-effect-of-cadmium-in-pbs-cds-colloidal-quantum-dots-probed-by-nm-scale-depth-profiling
#1
Pip C J Clark, Hanna Radtke, Atip Pengpad, Andrew I Williamson, Ben F Spencer, Samantha J O Hardman, Marina A Leontiadou, Darren C J Neo, Simon M Fairclough, Andrew A R Watt, Igor Pis, Silvia Nappini, Federica Bondino, Elena Magnano, Karsten Handrup, Karina Schulte, Mathieu G Silly, Fausto Sirotti, Wendy R Flavell
Achieving control of the surface chemistry of colloidal quantum dots (CQDs) is essential to fully exploit their properties in solar cells, but direct measurement of the chemistry and electronic structure in the outermost atomic layers is challenging. Here we probe the surface oxidation and passivation of cation-exchanged PbS/CdS core/shell CQDs with sub nm-scale precision using synchrotron-radiation-excited depth-profiling photoemission. We investigate the surface composition of the topmost 1-2.5 nm of the CQDs as a function of depth, for CQDs of varying CdS shell thickness, and examine how the surface changes after prolonged air exposure...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443129/maximum-plant-uptakes-for-water-nutrients-and-oxygen-are-not-always-met-by-irrigation-rate-and-distribution-in-water-based-cultivation-systems
#2
Chris Blok, Brian E Jackson, Xianfeng Guo, Pieter H B de Visser, Leo F M Marcelis
Growing on rooting media other than soils in situ -i.e., substrate-based growing- allows for higher yields than soil-based growing as transport rates of water, nutrients, and oxygen in substrate surpass those in soil. Possibly water-based growing allows for even higher yields as transport rates of water and nutrients in water surpass those in substrate, even though the transport of oxygen may be more complex. Transport rates can only limit growth when they are below a rate corresponding to maximum plant uptake...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28442373/nasal-mucociliary-transportability-of-male-and-female-smokers
#3
Juliana Souza Uzeloto, Dionei Ramos, Ana Paula C F Freire, Diego G D Christofaro, Ercy M C Ramos
INTRODUCTION: Female smoker's present increased susceptibility to several diseases when compared to the opposite gender. However, there are no studies showing differences in nasal mucociliary transport behavior between male and female smokers. OBJECTIVE: To compare the nasal mucociliary transportability in male and female smokers and non-smokers, taking into consideration age, anthropometric data, smoking load and pulmonary function. METHODS: The analysis included 139 individuals (33 men and 37 women smokers and 32 men and 37 women non-smokers)...
April 8, 2017: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28441488/formaldehyde-hcho-as-a-hazardous-air-pollutant-mapping-surface-air-concentrations-from-satellite-and-inferring-cancer-risks-in-the-united-states
#4
Lei Zhu, Daniel J Jacob, Frank N Keutsch, Loretta J Mickley, Richard D Scheffe, Madeleine Strum, Gonzalo González Abad, Kelly Chance, Kai Yang, Bernhard Rappenglueck, Dylan B Millet, Munkhbayar Baasandorj, Lyatt Jaeglé, Viral Pinakin Shah
Formaldehyde (HCHO) is the most important carcinogen in outdoor air among the 187 hazardous air pollutants (HAPs) identified by the US Environmental Protection Agency (EPA), not including ozone and particulate matter. However, surface observations of HCHO are sparse and the EPA monitoring network could be prone to positive interferences. Here we use 2005-2016 summertime HCHO column data from the OMI satellite instrument, validated with high-quality aircraft data and oversampled on a 5 × 5 km(2) grid, to map surface air HCHO concentrations across the contiguous US...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28440694/fine-particulate-matter-pm2-5-a-risk-factor-of-rat-gestational-diabetes-with-altered-blood-glucose-and-pancreatic-glut2-expression
#5
Liu Yi, Chen Wei, Wang Fan
Recent studies have shown an association between air pollution and diabetic risk. This study was to investigate the impact of fine particulate matter (PM2.5) on glucose consequences and pancreas glucose transporter 2 (GLUT2) expression and its related mechanisms in a gestational diabetes mellitus (GDM) rat model. GDM rats were exposed to a low PM2.5 dose while the controls received saline. Interleukin-6 (IL-6) and blood routine tests (BRT) were detected for analyzing coagulation and inflammation. Pancreas tissues underwent pathologic examination, the levels of homogenate glutathione peroxidase (GSH-Px), and methane dicarboxylic aldehyde (MDA) were detected for oxidative stress estimation, and the degree of GLUT2 expression of pancreas was analyzed...
April 25, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28440282/understanding-the-rising-phase-of-the-pm2-5-concentration-evolution-in-large-china-cities
#6
Baolei Lv, Jun Cai, Bing Xu, Yuqi Bai
Long-term air quality observations are seldom analyzed from a dynamic view. This study analyzed fine particulate matter (PM2.5) pollution processes using long-term PM2.5 observations in three Chinese cities. Pollution processes were defined as linearly growing PM2.5 concentrations following the criteria of coefficient of determination R(2) > 0.8 and duration time T ≥ 18 hrs. The linear slopes quantitatively measured pollution levels by PM2.5 concentrations rising rates (PMRR, μg/(m(3)·hr))...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28440082/metro-commuter-exposures-to-particulate-air-pollution-and-pm2-5-associated-elements-in-three-canadian-cities-the-urban-transportation-exposure-study
#7
Keith Van Ryswyk, Angelos T Anastasopolos, Greg Evans, Liu Sun, Kelly Sabaliauskas, Ryan Kulka, Lance Wallace, Scott Weichenthal
System-representative commuter air pollution exposure data were collected for the metro systems of Toronto, Montreal, and Vancouver, Canada. Pollutants measured included PM2.5 (PM = particulate matter), PM10, ultrafine particles, black carbon, and the elemental composition of PM2.5. Sampling over three weeks was conducted in summer and winter for each city and covered each system on a daily basis. Mixed-effect linear regression models were used to identify system features related to particulate exposures. Ambient levels of PM2...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28438222/hypothermia-in-trauma-victims-at-first-arrival-of-ambulance-personnel-an-observational-study-with-assessment-of-risk-factors
#8
Frédéric Lapostolle, James Couvreur, François Xavier Koch, Dominique Savary, Armelle Alhéritière, Michel Galinski, Jean-Luc Sebbah, Karim Tazarourte, Frédéric Adnet
BACKGROUND: Hypothermia is common in trauma victims and is associated with increased mortality, however its causes are little known. The objective of this study was to identify the risk factors associated with hypothermia in prehospital management of trauma victims. METHODS: This was an ancillary analysis of data recorded in the HypoTraum study, a prospective multicenter study conducted by the emergency medical services (EMS) of 8 hospitals in France. Inclusion criteria were: trauma victim, age over 18 years, and victim receiving prehospital care from an EMS team and transported to hospital by the EMS team in a medically equipped mobile intensive care unit...
April 24, 2017: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
https://www.readbyqxmd.com/read/28438016/highly-oriented-low-dimensional-tin-halide-perovskites-with-enhanced-stability-and-photovoltaic-performance
#9
Yuqin Liao, Hefei Liu, Wenjia Zhou, Dongwen Yang, Yuequn Shang, Zhifang Shi, Binghan Li, Xianyuan Jiang, Lijun Zhang, Li Na Quan, Rafael Quintero-Bermudez, Brandon R Sutherland, Qixi Mi, Edward H Sargent, Zhijun Ning
The low toxicity and a near-ideal choice of bandgap make tin (Sn) perovskite an attractive alternative to lead perovskite in low cost solar cells. However, the development of Sn perovskite solar cells has been impeded by their extremely poor stability when exposed to oxygen. We report low-dimensional Sn perovskites that exhibit markedly-enhanced air stability in comparison with their 3D counterparts. The reduced degradation under air exposure is attributed to the improved thermodynamic stability after dimensional reduction, the encapsulating organic ligands, and the compact perovskite film preventing oxygen ingress...
April 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28437783/evacuation-of-a-tertiary-neonatal-centre-lessons-from-the-2016-kumamoto-earthquakes
#10
Osuke Iwata, Akihiko Kawase, Masanori Iwai, Kazuko Wada
BACKGROUND: Newborn infants hospitalised in the neonatal intensive care unit (NICU) are vulnerable to natural disasters. However, publications on evacuation from NICUs are sparse. The 2016 Kumamoto Earthquakes caused serious damage to Kumamoto City Hospital and its level III regional core NICU. Local/neighbour NICU teams and the disaster-communication team of a neonatal academic society cooperated to evacuate 38 newborn infants from the ward. OBJECTIVE: The aim of this paper was to highlight potential key factors to improve emergency NICU evacuation and coordination of hospital transportation following natural disasters...
April 25, 2017: Neonatology
https://www.readbyqxmd.com/read/28433763/biomass-burning-sources-and-their-contributions-to-the-local-air-quality-in-hong-kong
#11
K L Chan
In this paper, we present a quantitative estimation of the impacts of biomass burning emissions from different source regions to the local air quality in Hong Kong in 2014 using global chemistry transport model simulations, sun photometer measurements, satellite observations and local monitoring network data. This study focuses on two major biomass burning pollutants, black carbon aerosols and carbon monoxide (CO). The model simulations of atmospheric black carbon and CO show excellent agreement with sun photometer aerosol optical depth (AOD) measurements, satellite CO columns observations and local monitoring stations data...
April 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28429776/global-distribution-of-particle-phase-state-in-atmospheric-secondary-organic-aerosols
#12
Manabu Shiraiwa, Ying Li, Alexandra P Tsimpidi, Vlassis A Karydis, Thomas Berkemeier, Spyros N Pandis, Jos Lelieveld, Thomas Koop, Ulrich Pöschl
Secondary organic aerosols (SOA) are a large source of uncertainty in our current understanding of climate change and air pollution. The phase state of SOA is important for quantifying their effects on climate and air quality, but its global distribution is poorly characterized. We developed a method to estimate glass transition temperatures based on the molar mass and molecular O:C ratio of SOA components, and we used the global chemistry climate model EMAC with the organic aerosol module ORACLE to predict the phase state of atmospheric SOA...
April 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28426926/sorbent-material-characterization-using-in-tube-extraction-needles-as-inverse-gas-chromatography-column
#13
Xochitli L Osorio Barajas, Maik A Jochmann, Thorsten Hüffer, Beat Schilling, Torsten C Schmidt
In-tube extraction is a full automated enrichment technique, which consists of a stainless-steel needle, packed with sorbent material for the extraction of volatile and semi-volatile compounds. In principle, all particulate sorbents used for enrichment in air or headspace analysis can be used. However, the selection of the sorbents is merely based on empirical considerations rather than on experimental data, which is caused by a lack of knowledge about the relevant physicochemical properties of the sorbent...
April 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28426040/enhancement-of-the-hole-conducting-effect-of-nio-by-a-n2-blow-drying-method-in-printable-perovskite-solar-cells-with-low-temperature-carbon-as-the-counter-electrode
#14
T A Nirmal Peiris, Ajay K Baranwal, Hiroyuki Kanda, Shota Fukumoto, Shusaku Kanaya, Ludmila Cojocaru, Takeru Bessho, Tsutomu Miyasaka, Hiroshi Segawa, Seigo Ito
In this article, we demonstrate for the first time a mesoscopic printable perovskite solar cell (PSC) using NiO as the hole transporting material and low-temperature processed carbon as the counter electrode. A single deposition method assisted by N2 blow drying was used for the deposition of MAPbI3 on a TiO2/ZrO2/NiO screen-printed electrode. As the final step a low-temperature processing (i.e. 75 °C) carbon counter layer was fabricated on MAPbI3 by a blade coating method. It is found that the capping layer thickness of MAPbI3 has a significant effect on the device efficiency, especially when NiO is introduced as a hole transporting material into the structure...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28423049/inmap-a-model-for-air-pollution-interventions
#15
Christopher W Tessum, Jason D Hill, Julian D Marshall
Mechanistic air pollution modeling is essential in air quality management, yet the extensive expertise and computational resources required to run most models prevent their use in many situations where their results would be useful. Here, we present InMAP (Intervention Model for Air Pollution), which offers an alternative to comprehensive air quality models for estimating the air pollution health impacts of emission reductions and other potential interventions. InMAP estimates annual-average changes in primary and secondary fine particle (PM2...
2017: PloS One
https://www.readbyqxmd.com/read/28422547/active-travel-behavior-in-a-border-region-of-texas-and-new-mexico-motivators-deterrents-and-characteristics
#16
Ipek N Sener, Richard J Lee
BACKGROUND: Active travel has been linked with improved transportation and health outcomes, such as reduced traffic congestion and air pollution, improved mobility, accessibility and equity, and increased physical and mental health. The purpose of this study was to better understand active travel characteristics, motivators, and deterrents in the El Paso, Texas, region. METHODS: A multimodal transportation survey brought together elements of transportation and health, with a focus on attitudinal characteristics...
April 19, 2017: Journal of Physical Activity & Health
https://www.readbyqxmd.com/read/28419017/the-evaluation-of-trauma-care-the-comparison-of-2-high-level-pediatric-emergency-departments-in-the-united-states-and-turkey
#17
Alkan Bal, Michael Cooper, Amanda Lee, Murat Anil, Halim Hennes
OBJECTIVE: The purpose of the study is to compare the outcomes of pediatric trauma patients with motor vehicle crashes (MVCs) and motor vehicle versus pedestrian crashes (MPCs) at a level 1 pediatric trauma center in the United States and a pediatric trauma center in Turkey. METHODS: The medical records of all pediatric MVC and MPC subjects presenting to the emergency departments (EDs) of a level 3 hospital in Turkey (Izmir Tepecik Training and Research Hospital [ITTRH]) and a level 1 pediatric trauma center in the United States (Children's Medical Center Dallas [CMCD]) over a 1-year period were reviewed...
April 18, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28417631/inkjet-printed-quantum-dot-light-emitting-diodes-with-an-air-stable-hole-transport-material
#18
Zhenhua Xing, Jinyong Zhuang, Changting Wei, Dongyu Zhang, Zhong-Zhi Xie, Xiao-Ping Xu, Shun-Jun Ji, Jian-Xin Tang, Wenming Su, Zheng Cui
High efficiency quantum dots light emitting diodes (QLEDs) have been fabricated by inkjet printing with a novel cross-linkable hole transport material N,N'-(9,9'-spirobi[fluorene]-2,7-diylbis(4,1-phenylene))bis(N-phenyl-4'-vinyl-[1,1'-biphenyl]-4-amine) (SDTF). The cross-linked SDTF film has excellent solvent resistance, high thermal stability and a highest occupied molecular orbital (HOMO) level of -5.54 eV. The inkjet printed SDTF film is very smooth and uniform with a roughness as low as 0.37 nm, which is comparable with the spin-coated film (0...
April 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28412622/population-production-pollution-nexus-based-air-pollution-management-model-for-alleviating-the-atmospheric-crisis-in-beijing-china
#19
X T Zeng, Y F Tong, L Cui, X M Kong, Y N Sheng, L Chen, Y P Li
In recent years, increscent emissions in the city of Beijing due to expanded population, accelerated industrialization and inter-regional pollutant transportation have led to hazardous atmospheric pollution issues. Although a number of anthropogenic control measures have been put into use, frequent/severe haze events have still challenged regional governments. In this study, a hybrid population-production-pollution nexus model (PPP) is proposed for air pollution management and air quality planning (AMP) with the aim to coordinate human activities and environmental protection...
April 13, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28411750/safety-of-air-travel-in-the-immediate-postoperative-period-after-anatomic-pulmonary-resection
#20
Stephen D Cassivi, Karlyn E Pierson, Bettie J Lechtenberg, Francis C Nichols, K Robert Shen, Mark S Allen, Dennis A Wigle
OBJECTIVE: The study objective was to determine whether air travel in the immediate postoperative period after anatomic pulmonary resection is associated with increased morbidity or mortality. METHODS: All patients undergoing anatomic pulmonary resection at the Mayo Clinic (2005-2012) were identified and sent surveys querying their mode of transportation home after hospital dismissal and any complications encountered during or shortly after this travel. This included pneumonia, hospital readmission, deep venous thrombosis/pulmonary embolism, and specific pleural complications (pneumothorax, empyema, or chest tube placement)...
May 2017: Journal of Thoracic and Cardiovascular Surgery
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