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https://www.readbyqxmd.com/read/28633853/multi-objective-optimization-of-oxidative-desulfurization-in-a-sono-photochemical-airlift-reactor
#1
Jamshid Behin, Negin Farhadian
Response surface methodology (RSM) was employed to optimize ultrasound/ultraviolet-assisted oxidative desulfurization in an airlift reactor. Ultrasonic waves were incorporated in a novel-geometry reactor to investigate the synergistic effects of sono-chemistry and enhanced gas-liquid mass transfer. Non-hydrotreated kerosene containing sulfur and aromatic compounds was chosen as a case study. Experimental runs were conducted based on a face-centered central composite design and analyzed using RSM. The effects of two categorical factors, i...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633841/novel-approaches-based-on-ultrasound-for-treatment-of-wastewater-containing-potassium-ferrocyanide
#2
Rajashree H Jawale, Akash Tandale, Parag R Gogate
Industrial wastewaters containing biorefractory compounds like cyanide offer significant environmental problems attributed to the fact that the conventional methods have limited effectiveness and hence developing efficient treatment approaches is an important requirement. The present work investigates the use of novel treatment approach of ultrasound (US) combined with advanced oxidation techniques for the degradation of potassium ferrocyanide (KFC) for the first time. An ultrasonic bath equipped with longitudinal horn (1kW rated power and 25kHz frequency) has been used...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633004/field-evaluations-of-newly-available-interference-free-monitors-for-nitrogen-dioxide-no2-and-ozone-o3-at-near-road-and-conventional-naaqs-compliance-sites
#3
Alan R Leston, Will M Ollison
Long standing measurement techniques for determining ground-level ozone (O3) and nitrogen dioxide (NO2) are known to be biased by interfering compounds that result in overestimates of high O3 and NO2 ambient concentrations under conducive conditions. An increasing near-ground O3 gradient (NGOG) with increasing height above ground level is also known to exist. Both the interference bias and NGOG were investigated by comparing data from a conventional Federal Equivalent Method (FEM) O3 photometer and an identical monitor upgraded with an "interference-free" nitric oxide O3 scrubber which alternatively sampled at 2 meter and 6...
June 20, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28631872/formation-of-bifeo3-from-a-binary-oxide-superlattice-grown-by-atomic-layer-deposition
#4
Aleksandr V Plokhikh, Matthias Falmbigl, Iryna S Golovina, Andrew R Akbashev, Igor A Karateev, Mikhail Y Presnyakov, Alexander L Vasiliev, Jonathan E Spanier
We report on the growth of polycrystalline BiFeO3 thin films on SiO2 /Si(001) and Pt(111) substrates by atomic layer deposition using the precursors ferrocene, triphenyl-bismuth, and ozone. By growing alternating layers of Fe2 O3 and Bi2 O3 , we employ a superlattice approach and demonstrate an efficient control of the cation stoichiometry. The superlattice decay and the resulting formation of polycrystalline BiFeO3 films are studied by in situ X-ray diffraction, in situ X-ray photoelectron spectroscopy, and transmission electron microscopy...
June 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28631724/microscopic-origins-of-the-large-piezoelectricity-of-leadfree-ba-ca-zr-ti-o3
#5
Yousra Nahas, Alireza Akbarzadeh, Sergei Prokhorenko, Sergey Prosandeev, Raymond Walter, Igor Kornev, Jorge Íñiguez, L Bellaiche
In light of directives around the world to eliminate toxic materials in various technologies, finding lead-free materials with high piezoelectric responses constitutes an important current scientific goal. As such, the recent discovery of a large electromechanical conversion near room temperature in (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 compounds has directed attention to understanding its origin. Here, we report the development of a large-scale atomistic scheme providing a microscopic insight into this technologically promising material...
June 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28631465/an-interfacial-investigation-on-printable-carbon-based-mesoscopic-perovskite-solar-cells-with-niox-c-back-electrode
#6
Fatemeh Behrouznejad, Cheng-Min Tsai, Sudhakar Narra, Eric W-G Diau, Nima Taghavinia
Solar cells with high-efficiency, low-cost and high-stability are the target for the new generation of solar cells. A fully printable perovskite (CH3NH3PbI3) solar cell (PSC) with device architecture FTO/TiO2/Al2O3/NiOx/C is fabricated in the current research as a low-cost and relatively stable structure and is investigated to determine how different fabrication factors such as the thickness of the insulating spacer layer (Al2O3) or treatments such as heat and UV-O3 treatments can affect the interfacial properties of this multi-layer mesoporous structure...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28628278/interfacial-charge-engineering-in-ferroelectric-controlled-mott-transistors
#7
Xuegang Chen, Xin Zhang, Mark A Koten, Hanghui Chen, Zhiyong Xiao, Le Zhang, Jeffrey E Shield, Peter A Dowben, Xia Hong
Heteroepitaxial coupling at complex oxide interfaces presents a powerful tool for engineering the charge degree of freedom in strongly correlated materials, which can be utilized to achieve tailored functionalities that are inaccessible in the bulk form. Here, the charge-transfer effect between two strongly correlated oxides, Sm0.5 Nd0.5 NiO3 (SNNO) and La0.67 Sr0.33 MnO3 (LSMO), is exploited to realize a giant enhancement of the ferroelectric field effect in a prototype Mott field-effect transistor. By switching the polarization field of a ferroelectric Pb(Zr,Ti)O3 (PZT) gate, nonvolatile resistance modulation in the Mott transistors with single-layer SNNO and bilayer SNNO/LSMO channels is induced...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28628242/lead-free-antiferroelectric-silver-niobate-tantalate-with-high-energy-storage-performance
#8
Lei Zhao, Qing Liu, Jing Gao, Shujun Zhang, Jing-Feng Li
Antiferroelectric materials that display double ferroelectric hysteresis loops are receiving increasing attention for their superior energy storage density compared to their ferroelectric counterparts. Despite the good properties obtained in antiferroelectric La-doped Pb(Zr,Ti)O3 -based ceramics, lead-free alternatives are highly desired due to the environmental concerns, and AgNbO3 has been highlighted as a ferrielectric/antiferroelectric perovskite for energy storage applications. Enhanced energy storage performance, with recoverable energy density of 4...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28626805/in-situ-polarization-and-dielectric-property-measurements-of-pb-zr0-52ti0-48-o3-ferroelectric-nanocrystals
#9
Haifa Zhai, Yurong Jiang, Hongjing Li, Panpan Zhang, Yixiao He, Dandan Shi, Xiang Zhang, Jien Yang
Pb(Zr0.52Ti0.48)O3/polycarbonate (PZT/PC) composite films with different concentration of PZT ferroelectric nanocrystals are prepared. The polarization and dielectric relaxation behavior of PZT ferroelectric nanocrystals are characterized using in situ transmittance and X-ray diffraction (XRD) measurements for the first time. It's found that 10% PZT/PC composite film has the largest orientation change and negligible dielectric relaxation after poling (the φ value of 13.8% is almost constant with time even for 168 h)...
June 2017: Heliyon
https://www.readbyqxmd.com/read/28625881/effects-of-exposure-to-biomass-burning-on-pulmonary-inflammatory-markers-and-pulmonary-function-in-individuals-with-copd
#10
D Ramos, M Proença, M R Leite, A D Ferreira, I B Trevisan, G F S Brígida, G Y Tacao, E M C Ramos
INTRODUCTION: Pulmonary rehabilitation (PR) has many benefits for individuals with COPD. However, it is not clear whether PR could prevent the hazards of air pollution exposure. This study aimed to analyze the effects of biomass burning exposure on pulmonary inflammatory markers and pulmonary function in individuals with COPD, participants and non-participants of PR. METHODS: 35 subjects were divided into three groups: individuals with COPD who received PR (G1, n=15), those who did not (G2, n=10), and a control group composed of healthy individuals without COPD (CG, n=10)...
June 15, 2017: Revista Portuguesa de Pneumologia
https://www.readbyqxmd.com/read/28624639/ozone-exposure-and-flux-based-response-relationships-with-photosynthesis-leaf-morphology-and-biomass-in-two-poplar-clones
#11
Bo Shang, Zhaozhong Feng, Pin Li, Xiangyang Yuan, Yansen Xu, Vicent Calatayud
Poplar clones 546 (P. deltoides cv. '55/56'×P. deltoides cv. 'Imperial') and 107 (P. euramericana cv. '74/76') were exposed to five ozone concentrations in 15 open-top chambers (OTCs). Both ozone exposure (AOT40, Accumulation Over a Threshold hourly ozone concentration of 40ppb) and flux-based (POD7, Phytotoxic Ozone Dose above an hourly flux threshold of 7nmol O3 m(-2) PLA (projected leaf area) s(-1)) response relationships were established with photosynthesis, leaf morphology and biomass variables. Increases in both metrics showed significant negative relationships with light-saturated photosynthesis rate, chlorophyll content, leaf mass per area, actual photochemical efficiency of PSII in the light and root biomass but not with stomatal conductance (gs), leaf and stem biomass...
June 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28623868/ozone-induced-foliar-damage-and-release-of-stress-volatiles-is-highly-dependent-on-stomatal-openness-and-priming-by-low-level-ozone-exposure-in-phaseolus-vulgaris
#12
Shuai Li, Peter C Harley, Ülo Niinemets
Acute ozone exposure triggers major emissions of volatile organic compounds (VOC), but quantitatively, it is unclear how different ozone doses alter the start and the total amount of these emissions, and the induction rate of different stress volatiles. It is also unclear whether priming (i.e., pre-exposure to lower O3 concentrations) can modify the magnitude and kinetics of volatile emissions. We investigated photosynthetic characteristics and VOC emissions in Phaseolus vulgaris following acute ozone exposure (600 nmol mol(-1) for 30 min) under illumination and in darkness and after priming with 200 nmol mol(-1) O3 for 30 min...
June 17, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28623424/does-air-pollution-trigger-suicide-a-case-crossover-analysis-of-suicide-deaths-over-the-life-span
#13
Lidia Casas, Bianca Cox, Mariska Bauwelinck, Benoit Nemery, Patrick Deboosere, Tim Steve Nawrot
In addition to underlying health disorders and socio-economic or community factors, air pollution may trigger suicide mortality. This study evaluates the association between short-term variation in air pollution and 10 years of suicide mortality in Belgium. In a bidirectional time-stratified case-crossover design, 20,533 suicide deaths registered between January 1st 2002 and December 31st 2011 were matched by temperature with control days from the same month and year. We used municipality-level air pollution [particulate matter (PM10) and O3 concentrations] data and meteorology data...
June 16, 2017: European Journal of Epidemiology
https://www.readbyqxmd.com/read/28623330/assessing-spatial-and-temporal-patterns-of-observed-ground-level-ozone-in-china
#14
Wan-Nan Wang, Tian-Hai Cheng, Xing-Fa Gu, Hao Chen, Hong Guo, Ying Wang, Fang-Wen Bao, Shuai-Yi Shi, Bin-Ren Xu, Xin Zuo, Can Meng, Xiao-Chuan Zhang
Elevated ground-level ozone (O3), which is an important aspect of air quality related to public health, has been causing increasing concern. This study investigated the spatiotemporal distribution of ground-level O3 concentrations in China using a dataset from the Chinese national air quality monitoring network during 2013-2015. This research analyzed the diurnal, monthly and yearly variation of O3 concentrations in both sparsely and densely populated regions. In particular, 6 major Chinese cities were selected to allow a discussion of variations in O3 levels in detail, Beijing, Chengdu, Guangzhou, Lanzhou, Shanghai, and Urumchi, located on both sides of the Heihe-Tengchong line...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28621944/mechanism-and-product-distribution-of-the-o3-initiated-degradation-of-e-2-heptenal-e-2-octenal-and-e-2-nonenal
#15
Elizabeth Gaona Colmán, María Belén Blanco, Ian Barnes, Peter Wiesen, Mariano Andrés Teruel
The O3-molecule initiated degradation of three 2-alkenals (E)-2-heptenal, (E)-2-octenal and (E)-2-nonenal has been investigated in a 1080 L quartz-glass environmental chamber at 298  2 K and atmospheric pressure of synthetic air using in situ FTIR spectroscopy to monitor the reactants and products. The experiments were performed in the absence of OH scavenger. The molar yields of the primary products formed were glyoxal (49 ± 4) % and pentanal (34 ± 3) % from the reaction of (E)-2-heptenal with O3, glyoxal (41 ± 3) % and hexanal (39 ± 3) % from the reaction of (E)-2-octenal with O3 and glyoxal (45 ± 3) % and heptanal (46 ± 3) % from the reaction of (E)-2-nonenal with O3...
June 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28621387/synthesis-of-mno2-on-activated-carbon-and-its-potential-application-in-the-adsorption-of-as-v-and-pb-ii-in-aqueous-solutions
#16
Roberto Contreras-Bustos, E Manríquez-Reza, Jaime Jiménez-Becerril, Melania Jiménez-Reyes, Bibiana Cercado-Quezada
The conditions for the synthesis of a material with MnO2 (OMD) on activated carbon (AC) were studied. These conditions were: reaction time, temperature, stirring speed, concentrations of AC, H2SO4, and O3 in solution, and particle size. Agglomerates on AC were observed by means of scanning electron microscopy (SEM) and microanalysis by energy dispersive spectroscopy (EDS) and revealed the presence of OMD deposited on the surface. The activation energy and the factor of frequency for the reaction were determined as Ea = 1...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28620861/testing-a-ratio-of-photosynthesis-to-o3-uptake-as-an-index-for-assessing-o3-induced-foliar-visible-injury-in-poplar-trees
#17
Yasutomo Hoshika, Elisa Carrari, Lu Zhang, Giulia Carriero, Sara Pignatelli, Gianni Fasano, Alessandro Materassi, Elena Paoletti
Visible foliar injury by ozone (ozone visible injury) is known as a biomarker to assess potential phytotoxicity of ozone. We investigated ozone visible injury in an ozone-sensitive poplar (Oxford clone) under a 2-year free-air controlled exposure (FACE) experiment and calculated three ozone indices (i.e., accumulative ozone exposure over 40 ppb during daylight hours (AOT40), phytotoxic ozone dose above a flux threshold of 0 nmol m(-2) s(-1) (POD0), and the cumulative value of the ratio of hourly ozone uptake to net photosynthesis (ΣU/P n ) to assess the critical level (CL) at the time of the first symptom onset of ozone visible injury...
June 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28617453/slush-like-polar-structures-in-single-crystal-relaxors
#18
Hiroyuki Takenaka, Ilya Grinberg, Shi Liu, Andrew M Rappe
Despite more than 50 years of investigation, it is still unclear how the underlying structure of relaxor ferroelectrics gives rise to their defining properties, such as ultrahigh piezoelectric coefficients, high permittivity over a broad temperature range, diffuse phase transitions, strong frequency dependence in dielectric response, and phonon anomalies. The model of polar nanoregions inside a non-polar matrix has been widely used to describe the structure of relaxor ferroelectrics. However, the lack of precise knowledge about the shapes, growth and dipole patterns of polar nanoregions has led to the characterization of relaxors as "hopeless messes", and no predictive model for relaxor behaviour is currently available...
June 14, 2017: Nature
https://www.readbyqxmd.com/read/28616738/living-in-a-mediterranean-city-in-2050-broadleaf-or-evergreen-citizens
#19
Lorenzo Cotrozzi, Damiano Remorini, Elisa Pellegrini, Lucia Guidi, Cristina Nali, Giacomo Lorenzini, Rossano Massai, Marco Landi
The predicted effects of global change (GC) will be exacerbated in the more densely populated cities of the future, especially in the Mediterranean basin where some environmental cues, such as drought and tropospheric ozone (O3) pollution, already mine seriously plant survival. Physiological and biochemical responses of a Mediterranean, evergreen, isohydric plant species (Quercus ilex) were compared to those of a sympatric, deciduous, anisohydric species (Q. pubescens) under severe drought (20% of the effective daily evapotranspiration) and/or chronic O3 exposure (80 ppb for 5 h day(-1) for 28 consecutive days) to test which one was more successful in those highly limiting conditions...
June 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28615107/-preparation-and-characterization-of-mouse-polyclonal-antibody-against-conserved-region-of-human-foxo3
#20
Lei Li, Dan Lyu
Objective To purify the recombinant protein specific to conserved region of forkhead box O3 (FOXO3) and prepare mouse anti-human FOXO3 polyclonal antibody. Methods The DNA fragment (aa290-472) encoding conserved domain of FOXO3 was amplified by PCR, and subsequently cloned into pET28a vector. Following transformation into E.coli BL21, the soluble fusion protein His-FOXO3 was induced by IPTG and purified by Ni-NTA affinity chromatography. The purified protein was used to immunize BALB/c mice to generate polyclonal antibody...
June 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
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