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https://www.readbyqxmd.com/read/28231539/a-new-model-to-predict-diffusive-self-heating-during-composting-incorporating-the-reaction-engineering-approach-rea-framework
#1
Aditya Putranto, Xiao Dong Chen
During composting, self-heating may occur due to the exothermicities of the chemical and biological reactions. An accurate model for predicting maximum temperature is useful in predicting whether the phenomena would occur and to what extent it would have undergone. Elevated temperatures would lead to undesirable situations such as the release of large amount of toxic gases or sometimes would even lead to spontaneous combustion. In this paper, we report a new model for predicting the profiles of temperature, concentration of oxygen, moisture content and concentration of water vapor during composting...
February 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28231000/ion-gated-gas-separation-through-porous-graphene
#2
Ziqi Tian, Shannon M Mahurin, Sheng Dai, De-En Jiang
Porous graphene holds great promise as a one-atom-thin, high-permeance membrane for gas separation, but to precisely control the pore size down to three to five angstroms proves challenging. Here we propose an ion-gated graphene membrane comprising a monolayer of ionic liquid coated porous graphene to dynamically modulate the pore size to achieve selective gas separation. This approach enables the otherwise non-selective large pores on the order of 1 nm in size to be selective for gases whose diameters range from three to four angstroms...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230356/assessment-of-particle-pollution-from-jetliners-from-smoke-visibility-to-nanoparticle-counting
#3
Lukas Durdina, Benjamin T Brem, Ari Setyan, Frithjof Siegerist, Theo Rindlisbacher, Jing Wang
Aviation is a substantial and a fast growing emissions source. Besides greenhouse gases, aircraft engines emit black carbon (BC), a climate forcer and air pollutant. Aviation BC emissions have been regulated and estimated through exhaust smoke visibility (smoke number). Their impacts are poorly understood because emission inventories lack representative data. Here, we measured BC mass and number-based emissions of the most popular airliner's engines according to a new emission standard. We used a calibrated engine performance model to determine the emissions on the ground, at cruise altitude, and over entire flight missions...
February 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28228416/cough-and-expiration-reflexes-elicited-by-inhaled-irritant-gases-are-intensified-in-ovalbumin-sensitized-mice
#4
Cheng Zhang, Ruei-Lung Lin, Jeff Hong, Mehdi Khosravi, Lu-Yuan Lee
This study was designed to determine the effect of active sensitization with ovalbumin (Ova) on cough responses to inhaled irritant gases in mice. Conscious mice moved freely in a recording chamber while the pressure change in the chamber, audio and video signals of the mouse movements were recorded simultaneously to measure the frequencies of cough reflex (CR) and expiration reflex (ER). To further verify the accuracy of cough analysis, the intra-pleural pressure was also recorded by a telemetry sensor surgically implanted in the intra-pleural space in a subgroup of mice...
February 22, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28225597/interfacial-design-of-ternary-mixed-matrix-membranes-containing-pebax-1657-silver-nanopowder-bmim-bf4-for-improved-co2-separation-performance
#5
Ehsan Ghasemi Estahbanati, Mohammadreza Omidkhah, Abtin Ebadi Amooghin
In this research, Pebax1657 as an organic phase and silver nanoparticles as an inorganic phase were used for preparation of binary mixed matrix membranes (MMMs). Silver nanoparticles as a filler could enter the polymer chains and enhance the gas permeability by increasing the fractional free volume of membranes. Afterwards, ternary MMMs were fabricated by addition of 1-Butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) ionic liquid, in order to have better polymer/filler adhesion and eliminate interfacial defects and non-selective voids...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28225197/prediction-on-dielectric-strength-and-boiling-point-of-gaseous-molecules-for-replacement-of-sf6
#6
Xiaojuan Yu, Hua Hou, Baoshan Wang
Developing the environment-friendly insulation gases to replace sulfur hexafluoride (SF6 ) has attracted considerable experimental and theoretical attentions but without success. A computational methodology was presented herein for prediction on dielectric strength and boiling point of arbitrary gaseous molecules in the purpose of molecular design and screening. New structure-activity relationship (SAR) models have been established by combining the density-dependent properties of the electrostatic potential surface, including surface area and the statistical variance of the surface potentials, with the molecular properties including polarizability, electronegativity, and hardness...
April 15, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28224149/two-new-metal-organic-frameworks-based-on-tetrazole-heterocyclic-ligands-accompanied-by-in-situ-ligand-formation
#7
Qin Li, Mei-Hui Yu, Jian Xu, Ai-Lin Li, Tong-Liang Hu, Xian-He Bu
Based on the same in situ formed ligand, two new MOFs, namely {[Zn2(HL)2]·0.5DMF·H2O}n (1) and {[Cd2(HL)2]·1.5H2O}n (2) (H3L = 5-[(2H-tetrazol-5-yl)amino]isophthalic acid), have been solvothermally synthesized and structurally characterized by elemental analysis, IR, PXRD, and single-crystal X-ray diffraction. During the self-assembly process, the original ligand H2ATBDC (5-(5-amino-1H-tetrazol-1-yl)-1,3-benzenedicarboxylic acid) undergoes the Dimroth rearrangement to form a new ligand H3L, consequently contributing to the construction of the two new MOFs...
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28222834/acute-and-chronic-outcomes-of-gas-bubble-disease-in-a-colony-of-african-clawed-frogs-xenopus-laevis
#8
Julia Y Tsai, Stephen A Felt, Donna M Bouley, Sherril L Green
Gas-bubble disease occurs in aquatic species that are exposed to water that is supersaturated with gases. In February 2007, municipal water supersaturated with gas was inadvertently pumped into the vivarium's aquatic housing systems and affected approximately 450 adult female Xenopus laevis. The inflow of supersaturated water was stopped immediately, the holding tanks aggressively aerated, and all experimental manipulations and feeding ceased. Within the first 6 h after the event, morbidity approached 90%, and mortality reached 3...
February 1, 2017: Comparative Medicine
https://www.readbyqxmd.com/read/28221797/acid-gas-adsorption-on-metal-organic-framework-nanosheets-as-a-model-of-an-all-surface-material
#9
Joshua D Howe, Yang Liu, Luis Flores, David A Dixon, David S Sholl
To establish a model of metal-organic framework (MOF) surfaces and build an understanding of surface-specific ligand adsorption phenomena in MOFs, we present a computational study exploring multiple models of a series of MOF-2 nanosheet materials, "M-BDCs", with M = Zn, Cu, and Co and BDC = benzene-1,4-dicarboxylate. We study and assess the appropriateness of a series of models ranging from small clusters (18 atoms) to fully periodic sheet models. We additionally study the interactions of these models with acid gases and energy-relevant small molecules (CO, CO2, H2O, SO2, NO2, and H2S)...
February 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28220910/chemical-incidents-resulted-in-hazardous-substances-releases-in-the-context-of-human-health-hazards
#10
Anna Pałaszewska-Tkacz, Sławomir Czerczak, Katarzyna Konieczko
OBJECTIVES: The research purpose was to analyze data concerning chemical incidents in Poland collected in 1999-2009 in terms of health hazards. MATERIAL AND METHODS: The data was obtained, using multimodal information technology (IT) system, from chemical incidents reports prepared by rescuers at the scene. The final analysis covered sudden events associated with uncontrolled release of hazardous chemical substances or mixtures, which may potentially lead to human exposure...
February 21, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28218304/laser-calorimetry-spectroscopy-for-ppm-level-dissolved-gas-detection-and-analysis
#11
Nagapriya K S, Shashank Sinha, Prashanth R, Samhitha Poonacha, Gunaranjan Chaudhry, Anandaroop Bhattacharya, Niloy Choudhury, Saroj Mahalik, Sandip Maity
In this paper we report a newly developed technique - laser calorimetry spectroscopy (LCS), which is a combination of laser absorption spectroscopy and calorimetry - for the detection of gases dissolved in liquids. The technique involves determination of concentration of a dissolved gas by irradiating the liquid with light of a wavelength where the gas absorbs, and measuring the temperature change caused by the absorbance. Conventionally, detection of dissolved gases with sufficient sensitivity and specificity was done by first extracting the gases from the liquid and then analyzing the gases using techniques such as gas chromatography...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28217900/concerning-the-role-of-supercritical-carbon-dioxide-in-sn-1-reactions
#12
Yun X Qiao, Nils Theyssen, Tobias Eifert, Marcel A Liauw, Giancarlo Franciò, Karolin Schenk, Walter Leitner, Manfred T Reetz
A series of SN 1-type reactions has been studied under various conditions to clarify the role of supercritical carbon dioxide (scCO2 ) as reaction medium for this kind of transformations. The application of scCO2 did not result in higher yields in any of the experiments in comparison to those under neat conditions or in the presence of other inert compressed gases. High-pressure UV/Vis spectroscopic measurements were carried out to quantify the degree of carbocation formation of a highly SN 1-active alkyl halide as a function of the applied solvent...
February 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28217296/anti-inflammatory-signaling-the-point-of-convergence-for-medical-gases-in-neuroprotection-against-ischemic-stroke
#13
REVIEW
Pei-Ying Li, Xin Wang, R Anne Stetler, Jun Chen, Wei-Feng Yu
Recent studies suggest that a variety of medical gases confer neuroprotective effects against cerebral ischemia, extending function beyond their regular clinical applications. The mechanisms underlying ischemic neuroprotection afforded by medical gases have been intensively studied over the past two decades. A number of signaling pathways have been proposed, among which anti-inflammatory signaling has been proven to be critical. Pursuit of the role for anti-inflammatory signaling may shed new light on the translational application of medical gas-afforded neuroprotection...
October 2016: Medical Gas Research
https://www.readbyqxmd.com/read/28217295/anti-oxidative-aspect-of-inhaled-anesthetic-gases-against-acute-brain-injury
#14
REVIEW
Tuo Yang, Yang Sun, Feng Zhang
Acute brain injury is a critical and emergent condition in clinical settings, which needs to be addressed urgently. Commonly acute brain injuries include traumatic brain injury, ischemic and hemorrhagic strokes. Oxidative stress is a key contributor to the subsequent injuries and impedes the reparative process after acute brain injury; therefore, facilitating an anti-oxidative approach is important in the care of those diseases. Readiness to deliver and permeability to blood brain barrier are essential for the use of this purpose...
October 2016: Medical Gas Research
https://www.readbyqxmd.com/read/28216557/a-methodology-to-monitor-airborne-pm10-dust-particles-using-a-small-unmanned-aerial-vehicle
#15
Miguel Alvarado, Felipe Gonzalez, Peter Erskine, David Cliff, Darlene Heuff
Throughout the process of coal extraction from surface mines, gases and particles are emitted in the form of fugitive emissions by activities such as hauling, blasting and transportation. As these emissions are diffuse in nature, estimations based upon emission factors and dispersion/advection equations need to be measured directly from the atmosphere. This paper expands upon previous research undertaken to develop a relative methodology to monitor PM10 dust particles produced by mining activities making use of small unmanned aerial vehicles (UAVs)...
February 14, 2017: Sensors
https://www.readbyqxmd.com/read/28216556/a-wearable-wireless-sensor-network-for-indoor-smart-environment-monitoring-in-safety-applications
#16
Diego Antolín, Nicolás Medrano, Belén Calvo, Francisco Pérez
This paper presents the implementation of a wearable wireless sensor network aimed at monitoring harmful gases in industrial environments. The proposed solution is based on a customized wearable sensor node using a low-power low-rate wireless personal area network (LR-WPAN) communications protocol, which as a first approach measures CO₂ concentration, and employs different low power strategies for appropriate energy handling which is essential to achieving long battery life. These wearables nodes are connected to a deployed static network and a web-based application allows data storage, remote control and monitoring of the complete network...
February 14, 2017: Sensors
https://www.readbyqxmd.com/read/28215812/indoor-air-pollutants-ventilation-rate-determinants-and-potential-control-strategies-in-chinese-dwellings-a-literature-review
#17
Wei Ye, Xu Zhang, Jun Gao, Guangyu Cao, Xiang Zhou, Xing Su
After nearly twenty years of rapid modernization and urbanization in China, huge achievements have transformed the daily lives of the Chinese people. However, unprecedented environmental consequences in both indoor and outdoor environments have accompanied this progress and have triggered public awareness and demands for improved living standards, especially in residential environments. Indoor pollution data measured for >7000 dwellings (approximately 1/3 were newly decorated and were tested for volatile organic compound (VOC) measurements, while the rest were tested for particles, phthalates and other semi-volatile organic compounds (SVOCs), moisture/mold, inorganic gases and radon) in China within the last ten years were reviewed, summarized and compared with indoor concentration recommendations based on sensory or health end-points...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28215800/the-effects-of-coexisting-na2so4-on-heterogeneous-uptake-of-no2-on-caco3-particles-at-various-rhs
#18
Fang Tan, Bo Jing, Shengrui Tong, Maofa Ge
Atmospheric particles can undergo nucleation, coagulation, chemical-aging, dissolution-precipitation or other atmospheric processes, resulting in complex multicomponent aerosols. The coexisting species have potentially important consequences in the heterogeneous reactions of multicomponent aerosol particles with polluted gases, which are still poorly understood. The effect of coexisting Na2SO4 on heterogeneous uptake of NO2 on CaCO3 particles is investigated in a broad RH range. The combination of DRIFTS, Raman, SEM and IC provides qualitative and quantitative information about the formation of nitrate and other surface species...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28215237/severity-of-nocturnal-hypoxia-and-daytime-hypercapnia-predicts-cpap-failure-in-patients-with-copd-and-obstructive-sleep-apnea-overlap-syndrome
#19
Zuzana Kuklisova, Ruzena Tkacova, Pavol Joppa, Emiel Wouters, Manuel Sastry
BACKGROUND: Obstructive sleep apnea (OSA) and chronic obstructive pulmonary disease (COPD) are independent risk factors for cardiovascular diseases. In patients with OSA and concurrent COPD, continuous positive airway pressure (CPAP) therapy improves survival. Nevertheless, a significant proportion of such patients do not tolerate CPAP. The aim of the present study was to analyze early predictors of CPAP failure in patients with OSA and concurrent COPD, and to evaluate the effects of bilevel positive airway pressure (BiPAP) in this high-risk group of patients...
February 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28215168/contributions-of-the-interaction-between-dietary-protein-and-gut-microbiota-to-intestinal-health
#20
Ning Ma, Yanan Tian, Yi Wu, Xi Ma
There is growing recognition that composition and metabolic activity of the gut microbiota can be modulated by the dietary proteins which in turn impact health. The amino acid composition and digestibility of proteins, which are influenced by its source and amount of intake, play a pivotal role in determining the microbiota. Reciprocally, it appears that the gut microbiota is also able to affect protein metabolism which give rise to the view that function between the microbiota and protein can proceed in both directions...
February 16, 2017: Current Protein & Peptide Science
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