keyword
MENU ▼
Read by QxMD icon Read
search

O3

keyword
https://www.readbyqxmd.com/read/28340523/nanostructured-co-mn-3o4-for-high-capacitive-supercapacitor-applications
#1
Qinghua Tian, Xiang Wang, Guoyong Huang, Xueyi Guo
Nanostructured Co doped Mn3O4 spinel structure ((Co, Mn)3O4) were prepared by co-precipitation under O3 oxidizing conditions and post-heat treatment. The product was composed of nanogranules with a diameter of 20-60 nm. The electrochemical performance of (Co, Mn)3O4 electrode was tested by cyclic voltammetry, impedance, and galvanostatic charge-discharge measurements. A maximum specific capacitance value of 2701.0 F g(-1) at a current density of 5 A g(-1) could be obtained within the potential range from 0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28325907/photosensitization-of-tio2-nanofibers-by-ag2s-with-the-synergistic-effect-of-excess-surface-ti-3-states-for-enhanced-photocatalytic-activity-under-simulated-sunlight
#2
Samina Ghafoor, Sadia Ata, Nasir Mahmood, Salman Noshear Arshad
TiO2 nanofibers, with mean diameter ~200 nm, were fabricated by electrospinning and successfully photosensitized with low bandgap Ag2S nanoparticles of 11, 17, 23 and 40 nm mean sizes, with corresponding loading of 4, 10, 18 and 29 wt.% Ag2S, respectively. 17 nm Ag2S@TiO2 nanofibers exhibited optimal activity in the photodegradation of methylene blue under simulated sunlight with pseudo-first order rate constant of 0.019 min(-1) compared to 0.009 min(-1) for pure TiO2 nanofibers. In spite of greater visible-light absorption and reduced bandgap, larger than 17 nm Ag2S nanoparticles exhibited sluggish photodegradation kinetics probably due to less photo-induced carriers generation in TiO2 and reduced electron injection rates from the larger sized Ag2S into TiO2...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28323482/constraints-on-the-early-terrestrial-surface-uv-environment-relevant-to-prebiotic-chemistry
#3
Sukrit Ranjan, Dimitar D Sasselov
The UV environment is a key boundary condition to abiogenesis. However, considerable uncertainty exists as to planetary conditions and hence surface UV at abiogenesis. Here, we present two-stream multilayer clear-sky calculations of the UV surface radiance on Earth at 3.9 Ga to constrain the UV surface fluence as a function of albedo, solar zenith angle (SZA), and atmospheric composition. Variation in albedo and latitude (through SZA) can affect maximum photoreaction rates by a factor of >10.4; for the same atmosphere, photoreactions can proceed an order of magnitude faster at the equator of a snowball Earth than at the poles of a warmer world...
March 2017: Astrobiology
https://www.readbyqxmd.com/read/28321229/phycospheric-native-bacteria-pelagibaca-bermudensis-and-stappia-sp-ameliorate-biomass-productivity-of-tetraselmis-striata-kctc1432bp-in-co-cultivation-system-through-mutualistic-interaction
#4
Jungsoo Park, Bum Soo Park, Pengbin Wang, Shailesh K Patidar, Jin Ho Kim, Sae-Hee Kim, Myung-Soo Han
Effective sustainable algal cultivation techniques are essential for mass production of the marine microalga Tetraselmis for biofuel and array of co-products. The phycospheric communities affect the microalgal growth and metabolism through various allelochemical and nutrient interactions; hence, their potential to affect the quantity and quality of both biomass and bioproducts is significant. In the present study, we have screened the phycospheric communities of biofuel producing Tetraselmis striata (KCTC1432BP)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28319705/contributions-of-vehicular-emissions-and-secondary-formation-to-nitrous-acid-concentrations-in-ambient-urban-air-in-tokyo-in-the-winter
#5
Yoshihiro Nakashima, Yasuhiro Sadanaga, Shinji Saito, Junya Hoshi, Hiroyuki Ueno
Nitrous acid (HONO) plays an important role in the formation of OH radicals, which are involved in photochemical oxidation. HONO concentrations in ambient air at urban sites have previously been measured, but very few studies have been performed in central Tokyo. In this study, HONO concentrations in ambient air in southeast central Tokyo (near Tokyo Bay) in winter were determined by incoherent cavity enhanced absorption spectroscopy. The O3, NO, NO2, and SO2 concentrations were simultaneously determined. The NO concentrations were used to classify the parts of the study period into types I (high pollution), II (medium pollution), and III (low pollution)...
March 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319398/criegee-chemistry-on-aqueous-organic-surfaces
#6
Shinichi Enami, Agustin J Colussi
In the troposphere, the fate of gas-phase Criegee intermediates (CIs) is deemed to be determined by their reactions with water molecules. Here it is shown that CIs produced in situ on the surface of water/acetonitrile (W/AN) solutions react competitively with millimolar carboxylic acids. Present experiments probe, via online electrospray mass spectrometry, CIs chemistry on the surface of alpha-humulene and beta-caryophyllene in W/AN microjets exposed to O3(g) for < 10 micro sec. Mass-specific identification lets us establish the progeny of products and intermediates generated in the early stages of CIs reactions with H2O, D2O, H2O(18), and n-alkyl-COOH (n = 1-7)...
March 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28319180/effect-of-outdoor-air-pollution-on-asthma-exacerbations-in-children-and-adults-systematic-review-and-multilevel-meta-analysis
#7
Pablo Orellano, Nancy Quaranta, Julieta Reynoso, Brenda Balbi, Julia Vasquez
BACKGROUND: Several observational studies have suggested that outdoor air pollution may induce or aggravate asthma. However, epidemiological results are inconclusive due to the presence of numerous moderators which influence this association. The goal of this study was to assess the relationship between outdoor air pollutants and moderate or severe asthma exacerbations in children and adults through a systematic review and multilevel meta-analysis. MATERIAL AND METHODS: We searched studies published in English on PubMed, Scopus, and Google Scholar between January 2000 and October 2016...
2017: PloS One
https://www.readbyqxmd.com/read/28316231/heterogeneous-chemiluminescence-from-gas-solid-phase-interactions-of-ozone-with-alcohols-phenols-and-saccharides
#8
Dingkun Zhang, Yongzan Zheng, Xiangnan Dou, Haifeng Lin, Syed Niaz Ali Shah, Jin-Ming Lin
Gas-solid phase reactions between ozone (O3) and three representative solid alcohols, phenols and saccharides were investigated through heterogeneous chemiluminescence (CL) strategy. With interactions between these two species occurring at the surface of solid powder, obvious CL effect was obtained. This performance could be attributed to evolution of ROOOH intermediate which subsequently released emissive 1O2 species. This is the first report of analyzing the gas-solid phase CL performance of O3 with alcohols, phenols and saccharides...
March 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28300224/short-term-air-pollution-exposure-aggravates-parkinson-s-disease-in-a-population-based-cohort
#9
Hyewon Lee, Woojae Myung, Doh Kwan Kim, Satbyul Estella Kim, Clara Tammy Kim, Ho Kim
Increasing experimental evidence has suggested air pollution as new risk factor for neurological disease. Although long-term exposure is reportedly related to neurological disease, information on association with short-term exposure is scarce. We examined the association of short-term exposure to particles <2.5 μm (PM2.5), nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), and carbon monoxide (CO) with PD aggravation in Seoul from the National Health Insurance Service-National Sample Cohort, Korea during 2002-2013...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28300152/role-of-polar-nanoregions-with-weak-random-fields-in-pb-based-perovskite-ferroelectrics
#10
M A Helal, M Aftabuzzaman, S Tsukada, S Kojima
In relaxor ferroelectrics, the role of randomly orientated polar nanoregions (PNRs) with weak random fields (RFs) is one of the most puzzling issues of materials science. The relaxation time of polarization fluctuations of PNRs, which manifests themselves as a central peak (CP) in inelastic light scattering, is the important physical quantity to understand the dynamics of PNRs. Here, the angular and temperature dependences of depolarized and polarized CPs in 0.44Pb(Mg1/3Nb2/3)O3-0.56PbTiO3 single crystals with weak RFs have been studied by Raman and Brillouin scattering, respectively...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299819/arsenic-trioxide-combined-with-transarterial-chemoembolization-for-primary-liver-cancer-a-meta-analysis
#11
Xiu-He Lv, Chun-Hui Wang, Yan Xie
BACKGROUND: The benefit of combination therapy of arsenic trioxide (As2 O3 ) and transarterial chemoembolization (TACE) is debated. This meta-analysis was conducted to determine whether As2 O3 & TACE therapy achieves better therapeutic effects compared with TACE alone for primary liver cancer. METHODS: A systematic search of both English and Chinese databases was conducted for randomised controlled trials (RCTs). The main outcomes were therapeutic responses, survival rates, improvement in quality of life, and adverse events...
March 15, 2017: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28299698/piezoelectric-plate-sensor-peps-for-analysis-of-specific-kras-point-mutations-at-low-copy-number-in-urine-without-dna-isolation-or-amplification
#12
Ceyhun E Kirimli, Wei-Heng Shih, Wan Y Shih
We have examined in situ detection of single-nucleotide KRAS mutations in urine using a (Pb(Mg1/3Nb2/3)O3)0.65(PbTiO3)0.35 (PMN-PT) piezoelectric plate sensor (PEPS) coated with a 17-nucleotide (nt) locked nucleic acid (LNA) probe DNA complementary to the KRAS mutation without DNA isolation and amplification. In situ mutant (MT) DNA in urine in a wild type (WT) background was carried out at a flow rate of 4 mL/min and at 63 °C with the PEPS vertically situated at the center of the flow. Both the temperature and the impingement flow force discriminated the wild type...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28298108/analytic-energy-gradient-of-projected-hartree-fock-within-projection-after-variation
#13
Motoyuki Uejima, Seiichiro Ten-No
We develop a geometrical optimization technique for the projection-after-variation (PAV) scheme of the recently refined projected Hartree-Fock (PHF) as a fast alternative to the variation-after-projection (VAP) approach for optimizing the structures of molecules/clusters in symmetry-adapted electronic states at the mean-field computational cost. PHF handles the nondynamic correlation effects by restoring the symmetry of a broken-symmetry single reference wavefunction and moreover enables a black-box treatment of orbital selections...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28295712/modulation-doped-in2-o3-zno-heterojunction-transistors-processed-from-solution
#14
Dongyoon Khim, Yen-Hung Lin, Sungho Nam, Hendrik Faber, Kornelius Tetzner, Ruipeng Li, Qiang Zhang, Jun Li, Xixiang Zhang, Thomas D Anthopoulos
This paper reports the controlled growth of atomically sharp In2 O3 /ZnO and In2 O3 /Li-doped ZnO (In2 O3 /Li-ZnO) heterojunctions via spin-coating at 200 °C and assesses their application in n-channel thin-film transistors (TFTs). It is shown that addition of Li in ZnO leads to n-type doping and allows for the accurate tuning of its Fermi energy. In the case of In2 O3 /ZnO heterojunctions, presence of the n-doped ZnO layer results in an increased amount of electrons being transferred from its conduction band minimum to that of In2 O3 over the interface, in a process similar to modulation doping...
March 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28295700/ti-substituted-nani0-5-mn0-5-x-tix-o2-cathodes-with-reversible-o3-p3-phase-transition-for-high-performance-sodium-ion-batteries
#15
Peng-Fei Wang, Hu-Rong Yao, Xin-Yu Liu, Jie-Nan Zhang, Lin Gu, Xi-Qian Yu, Ya-Xia Yin, Yu-Guo Guo
Sodium-ion batteries (SIBs) have been considered as potential candidates for stationary energy storage because of the low cost and wide availability of Na sources. O3-type layered oxides have been considered as one of the most promising cathodes for SIBs. However, they commonly show inevitable complicated phase transitions and sluggish kinetics, incurring rapid capacity decline and poor rate capability. Here, a series of sodium-sufficient O3-type NaNi0.5 Mn0.5-x Ti x O2 (0 ≤ x ≤ 0.5) cathodes for SIBs is reported and the mechanisms behind their excellent electrochemical performance are studied in comparison to those of their respective end-members...
March 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28295692/addressable-and-color-tunable-piezophotonic-light-emitting-stripes
#16
Yan Chen, Yang Zhang, Daniil Karnaushenko, Li Chen, Jianhua Hao, Fei Ding, Oliver G Schmidt
Piezophotonic light-emitting devices have great potential for future microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS) due to the added functionality provided by the electromechanical transduction coupled with the ability of light emission. Piezophotonic light-emitting source based on Pb(Mg1/3 Nb2/3 )O3 -PbTiO3 (PMN-PT) bulk is severely restricted by many challenges, such as high voltage burden, low integration density, and micromanufacturing complexity. Developing chip-integrated devices or incorporating such photonic components onto a Si platform is highly sought after in this field...
March 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28292609/organic-micropollutants-omps-oxidation-by-ozone-effect-of-activated-carbon-on-toxicity-abatement
#17
Oscar Rozas, Carolina Baeza, Katherine Núñez, Alfred Rossner, Roberto Urrutia, Héctor D Mansilla
Oxidation and removal of organic micropollutants (OMPs) on ultrapure (UPW) and natural water (NW) by ozone (O3) and ozone/powdered activated carbon (O3/PAC) have been studied. The OMPs atrazine (ATZ, herbicide), carbamazepine (CBZ, anticonvulsant), diclofenac (DCL, anti-inflammatory) and triclosan (TCS, antimicrobial) are incorporated continuously and uncontrolled on water treatment systems (e.g., drinking water treatment plants, wastewater treatment plants). Batch experiments on ultrapure and natural water showed that ATZ treated with O3 and O3/PAC has the slowest transformation rate (>90% at 30min reaction) while CBZ, DCL and TCS were oxidized very fast (>90% at ~5min)...
March 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28290139/the-spatial-variation-of-o3-no-no2-and-no-x-and-the-relation-between-them-in-two-swedish-cities
#18
Annika Hagenbjörk, E Malmqvist, K Mattisson, Nilsson J Sommar, L Modig
Ozone and nitrogen oxides (NO x ) are air pollutants with known associations to adverse health effects on humans. Few studies have simultaneously measured ozone and nitrogen oxides with high spatial resolution. The main aim of this paper was to assess the levels and variation of ground-level ozone, NO2 and NO x in two Swedish cities. An additional aim was to describe the levels of these pollutants within and between three different types of measurement sites (regional background, urban background and traffic sites) and within and between different measurement periods of the year...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28289289/evidence-for-a-fe-3-rich-pyrolitic-lower-mantle-from-al-fe-bearing-bridgmanite-elasticity-data
#19
A Kurnosov, H Marquardt, D J Frost, T Boffa Ballaran, L Ziberna
The chemical composition of Earth's lower mantle can be constrained by combining seismological observations with mineral physics elasticity measurements. However, the lack of laboratory data for Earth's most abundant mineral, (Mg,Fe,Al)(Al,Fe,Si)O3 bridgmanite (also known as silicate perovskite), has hampered any conclusive result. Here we report single-crystal elasticity data on (Al,Fe)-bearing bridgmanite (Mg0.9Fe0.1Si0.9Al0.1)O3 measured using high-pressure Brillouin spectroscopy and X-ray diffraction. Our measurements show that the elastic behaviour of (Al,Fe)-bearing bridgmanite is markedly different from the behaviour of the MgSiO3 endmember...
March 13, 2017: Nature
https://www.readbyqxmd.com/read/28289048/health-risk-of-inhalation-exposure-to-sub-10%C3%A2-%C3%A2%C2%B5m-particulate-matter-and-gaseous-pollutants-in-an-urban-industrial-area-in-south-africa-an-ecological-study
#20
Oyewale Mayowa Morakinyo, Ayo Stephen Adebowale, Matlou Ingrid Mokgobu, Murembiwa Stanley Mukhola
OBJECTIVE: To assess the health risks associated with exposure to particulate matter (PM10), sulphur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3). DESIGN: The study is an ecological study that used the year 2014 hourly ambient pollution data. SETTING: The study was conducted in an industrial area located in Pretoria West, South Africa. The area accommodates a coal-fired power station, metallurgical industries such as a coke plant and a manganese smelter...
March 13, 2017: BMJ Open
keyword
keyword
108436
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"