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https://www.readbyqxmd.com/read/29136025/effects-of-rtv-coating-on-the-electrical-performance-of-polymer-insulator-under-lightning-impulse-voltage-condition
#1
Farah Adilah Jamaludin, Mohd Zainal Abidin Ab-Kadir, Mahdi Izadi, Norhafiz Azis, Jasronita Jasni, Muhammad Syahmi Abd-Rahman
Located near the equator, Malaysia is a country with one of the highest lightning densities in the world. Lightning contributes to 70% of the power outages in Malaysia and affects power equipment, automated network systems, causes data losses and monetary losses in the nation. Therefore, consideration of insulator evaluation under lightning impulses can be crucial to evaluate and attempt to overcome this issue. This paper presents a new approach to increase the electrical performance of polymer insulators using a Room Temperature Vulcanisation (RTV) coating...
2017: PloS One
https://www.readbyqxmd.com/read/29135237/unveiling-the-susceptibility-of-functional-groups-of-polyethersulfone-polyvinylpyrrolidone-membranes-to-naocl-a-two-dimensional-correlation-spectroscopic-study
#2
Zhongbo Zhou, Guocheng Huang, Yi Xiong, Minghao Zhou, Shaoqing Zhang, Chuyang Y Tang, Fangang Meng
A clear understanding of membrane ageing process is essential for the optimization of chemical cleaning in membrane-based facilities. In this study, two-dimensional (2D) Fourier transformation infrared (FTIR) correlation spectroscopy (COS) analysis was firstly used to decipher the sequential order of functional group changes of NaOCl-aged polyethersulfone/polyvinylpyrrolidone (PES/PVP) membranes. The synchronous maps showed twelve major autopeaks in total. Based on the asynchronous maps, a similar ageing sequence of membrane groups was clearly identified at three pH (i...
November 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29126635/on-road-and-laboratory-emissions-of-no-no2-nh3-n2o-and-ch4-from-late-model-eu-light-utility-vehicles-comparison-of-diesel-and-cng
#3
Michal Vojtíšek-Lom, Vít Beránek, Vojtěch Klír, Petr Jindra, Martin Pechout, Tomáš Voříšek
Exhaust emissions of eight Euro 6 light duty vehicles - two station wagons and six vans - half powered by diesel fuel and half by compressed natural gas (CNG) were examined using both chassis dynamometer and on-road testing. A portable on-board FTIR analyzer was used to measure concentrations of reactive nitrogen compounds - NO, NO2 and ammonia, of CO, formaldehyde, acetaldehyde and greenhouse gases CO2, methane and N2O. Exhaust flow was inferred from engine control unit data. Total emissions per cycle were compared and found to be in good agreement with laboratory measurements of NOX, CO and CO2 during dynamometer tests...
November 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29089587/design-of-reduction-process-of-sno2-by-ch4-for-efficient-sn-recovery
#4
Hyunwoo Ha, Mi Yoo, Hyesung An, Kihyun Shin, Taeyang Han, Youhan Sohn, Sangyeol Kim, Sang-Ro Lee, Jun Hyun Han, Hyun You Kim
We design a novel method for the CH4 reduction of SnO2 for the efficient recovery of Sn from SnO2 through a study combining theory and experiment. The atomic-level process of CH4-SnO2 interaction and temperature-dependent reduction behavior of SnO2 were studied with a combination of a multi-scale computational method of thermodynamic simulations and density functional theory (DFT) calculations. We found that CH4 was a highly efficient and a versatile reducing agent, as the total reducing power of CH4 originates from the carbon and hydrogen of CH4, which sequentially reduce SnO2...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29083160/synthesis-of-n-8-armchair-graphene-nanoribbons-from-four-distinct-polydiacetylenes
#5
Robert S Jordan, Yolanda L Li, Cheng-Wei Lin, Ryan D McCurdy, Janice B Lin, Jonathan L Brosmer, Kristofer L Marsh, Saeed I Khan, K N Houk, Richard B Kaner, Yves Rubin
We demonstrate a highly efficient thermal conversion of four differently substituted polydiacetylenes (PDAs 1 and 2a-c) into virtually indistinguishable N = 8 armchair graphene nanoribbons ([8]AGNR). PDAs 1 and 2a-c are themselves easily accessed through photochemically initiated topochemical polymerization of diynes 3 and 4a-c in the crystal. The clean, quantitative transformation of PDAs 1 and 2a-c into [8]AGNR occurs via a series of Hopf pericyclic reactions, followed by aromatization reactions of the annulated polycyclic aromatic intermediates, as well as homolytic bond fragmentation of the edge functional groups upon heating up to 600 °C under an inert atmosphere...
November 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29083152/photocatalytic-water-splitting-enhancement-by-sub-bandgap-photon-harvesting
#6
Angelo Monguzzi, Amadeus Oertel, Daniele Braga, Andreas Riedinger, David K Kim, Philippe N Knüsel, Alberto Bianchi, Michele Mauri, Roberto Simonutti, David J Norris, Francesco Meinardi
Upconversion is a photon-management process especially suited to water-splitting cells that exploit wide-bandgap photocatalysts. Currently, such catalysts cannot utilize 95% of the available solar photons. We demonstrate here that the energy-conversion yield for a standard photocatalytic water-splitting device can be enhanced under solar irradiance by using a low-power upconversion system that recovers part of the unutilized incident sub-bandgap photons. The upconverter is based on a sensitized triplet-triplet annihilation mechanism (sTTA-UC) obtained in a dye-doped elastomer and boosted by a fluorescent nanocrystal/polymer composite that allows for broadband light harvesting...
November 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29076513/is-objectively-measured-sitting-at-work-associated-with-low-back-pain-a-cross-sectional-study-in-the-dphacto-cohort
#7
Mette Korshøj, David M Hallman, Svend Erik Mathiassen, Mette Aadahl, Andreas Holtermann, Marie Birk Jørgensen
Objectives Low-back pain (LBP) is a substantial health challenge due to the risk for long-term sickness absence and early retirement. Several biomechanical exposures at work, including sitting, have been suggested to increase the risk for LBP. The objectives of this study were to determine (i) the extent to which temporal patterns and total amount of objectively measured sitting is associated with LBP intensity and (ii) whether selected modifiers influence these associations. Methods This cross sectional study uses baseline data from the Danish PHysical ACTivity cohort with Objective measurements (DPhacto) of physical activities in the cleaning, transport and manufacturing sectors...
October 27, 2017: Scandinavian Journal of Work, Environment & Health
https://www.readbyqxmd.com/read/29075671/design-of-flexible-polyphenylene-proton-conducting-membrane-for-next-generation-fuel-cells
#8
Junpei Miyake, Ryunosuke Taki, Takashi Mochizuki, Ryo Shimizu, Ryo Akiyama, Makoto Uchida, Kenji Miyatake
Proton exchange membrane fuel cells (PEMFCs) are promising devices for clean power generation in automotive, stationary, and portable applications. Perfluorosulfonic acid (PFSA) ionomers (for example, Nafion) have been the benchmark PEMs; however, several problems, including high gas permeability, low thermal stability, high production cost, and environmental incompatibility, limit the widespread dissemination of PEMFCs. It is believed that fluorine-free PEMs can potentially address all of these issues; however, none of these membranes have simultaneously met the criteria for both high performance (for example, proton conductivity) and durability (for example, mechanical and chemical stability)...
October 2017: Science Advances
https://www.readbyqxmd.com/read/29074717/2-chlorhexidine-70-isopropyl-alcohol-versus-10-povidone-iodine-for-insertion-site-cleaning-before-central-line-insertion-in-preterm-infants-a-randomised-trial
#9
Emily A Kieran, Anne O'Sullivan, Jan Miletin, Anne R Twomey, Susan J Knowles, Colm Patrick Finbarr O'Donnell
OBJECTIVE: To determine whether 2% chlorhexidine gluconate-70% isopropyl alcohol (CHX-IA) is superior to 10% aqueous povidone-iodine (PI) in preventing catheter-related blood stream infection (CR-BSI) when used to clean insertion sites before placing central venous catheters (CVCs) in preterm infants. DESIGN: Randomised controlled trial. SETTING: Two neonatal intensive care units (NICUs). PATIENTS: Infants <31 weeks' gestation who had a CVC inserted...
October 26, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/29071027/antibacterial-effect-of-diode-laser-in-pulpectomy-of-primary-teeth
#10
Zahra Bahrololoomi, Reza Fekrazad, Shiva Zamaninejad
Introduction: Laser irradiation has been suggested as an adjunct to traditional methods of canal preparation but few studies are available on the antibacterial effect of diode laser in pulpectomy of primary teeth. The purpose of the present study is to investigate the antibacterial effect of diode laser in pulpectomy of primary teeth, in addition to define the optimal and harmless diode lasing conditions in the root canal. Methods: A total of 125 single rooted primary teeth were selected. After traditional canal cleaning, they were divided in 2 groups...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29056186/stain-removal-and-whitening-by-baking-soda-dentifrice-a-review-of-literature
#11
Yiming Li
BACKGROUND: Tooth discoloration may be caused by intrinsic or extrinsic stains or a combination of both. There are 2 major approaches to removing the stains, including the chemical mechanism using peroxides for tooth bleaching and the mechanical mechanism using abrasives in prophylactic pastes and dentifrices to remove stains, resulting in a whitening effect. Attempts have also been made to add a low concentration of peroxides to dentifrices to enhance their abrasive cleaning to remove tooth stains...
November 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/29037589/a-twin-purification-enrichment-procedure-based-on-two-versatile-solid-liquid-extracting-agents-for-efficient-uptake-of-ultra-trace-levels-of-lorazepam-and-clonazepam-from-complex-bio-matrices
#12
Maryam Hemmati, Maryam Rajabi, Alireza Asghari
In this research work, two consecutive dispersive solid/liquid phase microextractions based on efficient extraction media were developed for the influential and clean pre-concentration of clonazepam and lorazepam from complicated bio-samples. The magnetism nature of the proposed nanoadsorbent proceeded the clean-up step conveniently and swiftly (∼5min), pursued by a further enrichment via a highly effective and rapid emulsification microextraction process (∼4min) based on a deep eutectic solvent (DES). Finally, the instrumental analysis step was practicable via high performance liquid chromatography-ultraviolet detection...
September 21, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29034925/charge-transport-interfacial-interactions-and-synergistic-mechanisms-in-binbo4-mwo4-m-zn-and-cd-heterostructures-for-hydrogen-production-insights-from-a-dft-u-study
#13
Francis Opoku, Krishna Kuben Govender, Cornelia Gertina Catharina Elizabeth van Sittert, Penny Poomani Govender
In the 21st century, the growing demand of global energy is one of the key challenges. The photocatalytic generation of hydrogen has attracted extensive attention to discuss the increasing global demand for sustainable and clean energy. However, hydrogen evolution reactions normally use the economically expensive rare noble metals and the processes remain a challenge. Herein, low-cost BiNbO4/MWO4(010) heterostructures are studied for the first time to check their suitability towards photocatalytic hydrogen production...
October 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29030615/electrokinetic-analysis-of-energy-harvest-from-natural-salt-gradients-in-nanochannels
#14
Yuhui He, Zhuo Huang, Bowei Chen, Makusu Tsutsui, Xiang Shui Miao, Masateru Taniguchi
The Gibbs free energy released during the mixing of river and sea water has been illustrated as a promising source of clean and renewable energy. Reverse electrodialysis (RED) is one major strategy to gain electrical power from this natural salinity, and recently by utilizing nanochannels a novel mode of this approach has shown improved power density and energy converting efficiency. In this work, we carry out an electrokinetic analysis of the work extracted from RED in the nanochannels. First, we outline the exclusion potential effect induced by the inhomogeneous distribution of extra-counterions along the channel axis...
October 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29018412/a-novel-lactobacilli-based-teat-disinfectant-for-improving-bacterial-communities-in-the-milks-of-cow-teats-with-subclinical-mastitis
#15
Jie Yu, Yan Ren, XiaoXia Xi, Weiqiang Huang, Heping Zhang
Teat disinfection pre- and post-milking is important for the overall health and hygiene of dairy cows. The objective of this study was to evaluate the efficacy of a novel probiotic lactobacilli-based teat disinfectant based on changes in somatic cell count (SCC) and profiling of the bacterial community. A total of 69 raw milk samples were obtained from eleven Holstein-Friesian dairy cows over 12 days of teat dipping in China. Single molecule, real-time sequencing technology (SMRT) was employed to profile changes in the bacterial community during the cleaning protocol and to compare the efficacy of probiotic lactic acid bacteria (LAB) and commercial teat disinfectants...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28994321/heatable-carbon-nanotube-composite-membranes-for-sustainable-recovery-from-biofouling
#16
Noe T Alvarez, Ryan Noga, So-Ryong Chae, George A Sorial, Hodon Ryu, Vesselin Shanov
Membrane filtration is one of the most reliable methods for water treatment. However, wider application is limited due to biofouling caused by accumulation of microorganisms on the membrane surface. This report details a heatable carbon nanotube composite membrane with self-cleaning properties for sustainable recovery from biofouling. Microfiltration polycarbonate/carbon-nanotubes hybrid membranes were fabricated using drawable nanotubes that maintained the porosity and provided electrical conductivity to the membrane...
October 10, 2017: Biofouling
https://www.readbyqxmd.com/read/28992201/progress-toward-rice-seed-omics-in-low-level-gamma-radiation-environment-in-iitate-village-fukushima
#17
Randeep Rakwal, Gohei Hayashi, Junko Shibato, Saligrama A Deepak, Seetaramanjaneyulu Gundimeda, Upendra Simha, Arunkumar Padmanaban, Ravi Gupta, Sang-Ik Han, Sun Tae Kim, Akihiro Kubo, Tetsuji Imanaka, Manabu Fukumoto, Ganesh Kumar Agrawal, Seiji Shioda
Here, we present an update on the next level of experiments studying the impact of the gamma radiation environment, created post-March, 2011 nuclear accident at Fukushima Daiichi nuclear power plant, on rice plant and its next generation - the seed. Japonica-type rice (Oryza sativa L. cv. Koshihikari) plant was exposed to low-level gamma radiation (~4 μSv/h) in the contaminated Iitate Farm field in Iitate village (Fukushima). Seeds were harvested from these plants at maturity, and serve as the treated group...
September 11, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28990602/self-sustainable-high-power-density-bio-solar-cells-for-lab-on-a-chip-applications
#18
Lin Liu, Seokheun Choi
A microfluidic lab-on-a-chip system that generates its own power is essential for stand-alone, independent, self-sustainable point-of-care diagnostic devices to work in limited-resource and remote regions. Miniaturized biological solar cells (or micro-BSCs) can be the most suitable power source for those lab-on-a-chip applications because the technique resembles the earth's natural ecosystem - living organisms work in conjunction with non-living components of their environment to create a self-assembling and self-maintaining system...
November 7, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28971554/p-b-desulfurization-an-enabling-method-for-protein-chemical-synthesis-and-site-specific-deuteration
#19
Kang Jin, Tianlu Li, Hoi Yee Chow, Han Liu, Xuechen Li
Cysteine-mediated native chemical ligation is a powerful method for protein chemical synthesis. Herein, we report an unprecedentedly mild system (TCEP/NaBH4 or TCEP/LiBEt3 H; TCEP=tris(2-carboxyethyl)phosphine) for chemoselective peptide desulfurization to achieve effective protein synthesis via the native chemical ligation-desulfurization approach. This method, termed P-B desulfurization, features usage of common reagents, simplicity of operation, robustness, high yields, clean conversion, and versatile functionality compatibility with complex peptides/proteins...
October 2, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28966337/influences-of-low-frequency-and-other-noises-produced-by-wind-turbines-an-epidemiological-literature-review
#20
Tatsuhiko Kubo, Hideki Hasunuma, Yoshitaka Morimatsu, Yoshihisa Fujino, Kunio Hara, Tatsuya Ishitake
Objectives Due to its' environment-friendly and clean energy characteristics, wind power has been increasingly used globally, particularly in advanced countries. However, concerns about health hazards, especially due to low-frequency and other noises generated from wind turbines, have been reported repeatedly. In order to manage adverse health effects appropriately, regulatory standards or guidelines that consider the health of residents need to be developed. To provide a scientific basis for the development of such regulatory standards and guidelines, this paper conducted a literature review to analyze epidemiological studies involving residents living in the vicinity of wind farms...
2017: [Nihon Kōshū Eisei Zasshi] Japanese Journal of Public Health
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