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https://www.readbyqxmd.com/read/28548922/development-of-ergonomics-audits-for-bagging-haul-truck-and-maintenance-and-repair-operations-in-mining
#1
Patrick G Dempsey, Jonisha Pollard, William L Porter, Alan Mayton, John R Heberger, Sean Gallagher, Leanna Reardon, Colin G Drury
The development and testing of ergonomics and safety audits for small and bulk bag filling, haul truck, and maintenance and repair operations in coal preparation and mineral processing plants found at surface mine sites is described. The content for the audits was derived from diverse sources of information on ergonomics and safety deficiencies including: analysis of injury, illness, and fatality data and reports; task analysis; empirical laboratory studies of particular tasks; field studies and observations at mine sites; and maintenance records...
May 26, 2017: Ergonomics
https://www.readbyqxmd.com/read/28544505/understanding-the-mechanisms-of-gold-shell-growth-onto-polymer-microcapsules-to-control-shell-thickness
#2
Alison Louise Tasker, James Hitchcock, Elaine Alice Baxter, Olivier Cayre, Simon Biggs
Polymer microcapsules have been used commercially for decades, however they have an inherent flaw which renders them impractical as a carrier of small, volatile molecules. The porous nature of the polymer shell allows for diffusion of the encapsulated molecules into the bulk. The use of metal shells is an innovative way to prevent undesired loss of small molecules from the core of microcapsules, however it is important, particularly when using expensive metals to ensure that the resulting shell is as thin as possible...
May 21, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28536197/melting-dynamics-of-ice-in-the-mesoscopic-regime
#3
Margherita Citroni, Samuele Fanetti, Naomi Falsini, Paolo Foggi, Roberto Bini
How does a crystal melt? How long does it take for melt nuclei to grow? The melting mechanisms have been addressed by several theoretical and experimental works, covering a subnanosecond time window with sample sizes of tens of nanometers and thus suitable to determine the onset of the process but unable to unveil the following dynamics. On the other hand, macroscopic observations of phase transitions, with millisecond or longer time resolution, account for processes occurring at surfaces and time limited by thermal contact with the environment...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28535953/genotoxic-potential-of-dental-bulk-fill-resin-composites
#4
Tobias T Tauböck, Danijela Marovic, Davor Zeljezic, Andrea D Steingruber, Thomas Attin, Zrinka Tarle
OBJECTIVE: To investigate both genotoxicity and hardening of bulk-fill composite materials applied in 4-mm layer thickness and photo-activated for different exposure times. METHODS: Three flowable bulk-fill materials and one conventional flowable composite were filled in molds (height: 4mm) and irradiated for 20 or 30s. The top (0mm) and bottom (4mm) specimen surface were mechanically scraped, and eluates (0.01g composite in 1.5ml RPMI 1640 cell culture media) prepared for each material, surface level and irradiation time...
May 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28534615/origins-of-water-molecules-in-the-photosystem-ii-crystal-structure
#5
Naoki Sakashita, Hiroshi C Watanabe, Takuya Ikeda, Keisuke Saito, Hiroshi Ishikita
The cyanobacterial photosystem II (PSII) crystal structure includes more than 1300 water molecules in each monomer unit; however, their precise roles in water oxidation are unclear. To understand the origins of water molecules in the PSII crystal structure, the accessibility of bulk water molecules to channel inner spaces in PSII was investigated using the water-removed PSII structure and molecular dynamics (MD) simulations. The inner space of the channel that proceeds toward the D1-Glu65/D2-Glu312 pair (E65/E312 channel) was entirely filled with water molecules from the bulk region...
May 23, 2017: Biochemistry
https://www.readbyqxmd.com/read/28532050/full-in-vitro-analyses-of-new-generation-bulk-fill-dental-composites-cured-by-halogen-light
#6
Tuçe Hazal Tekin, Aysel Kantürk Figen, Pınar Yılmaz Atalı, Bilge Coşkuner Filiz, Mehmet Burçin Pişkin
The objective of this study was to investigate the full in-vitro analyses of new-generation bulk-fill dental composites cured by halogen light (HLG). Two types' four composites were studied: Surefill SDR (SDR) and Xtra Base (XB) as bulk-fill flowable materials; QuixFill (QF) and XtraFill (XF) as packable bulk-fill materials. Samples were prepared for each analysis and test by applying the same procedure, but with different diameters and thicknesses appropriate to the analysis and test requirements. Thermal properties were determined by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC) analysis; the Vickers microhardness (VHN) was measured after 1, 7, 15 and 30days of storage in water...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530404/role-of-crystallization-in-the-morphology-of-polymer-non-fullerene-acceptor-bulk-heterojunctions
#7
Kathryn A O'Hara, David P Ostrowski, Unsal Koldemir, Christopher J Takacs, Sean E Shaheen, Alan Sellinger, Michael L Chabinyc
Many high efficiency organic photovoltaics use fullerene-based acceptors despite their high production cost, weak optical absorption in the visible range, and limited synthetic variability of electronic and optical properties. To circumvent this deficiency, non-fullerene small-molecule acceptors have been developed that have good synthetic flexibility, allowing for precise tuning of optoelectronic properties, leading to enhanced absorption of the solar spectrum and increased open-circuit voltages (VOC). We examined the detailed morphology of bulk heterojunctions of poly(3-hexylthiophene) and the small-molecule acceptor HPI-BT to reveal structural changes that lead to improvements in the fill factor of solar cells upon thermal annealing...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530330/-the-sherlock-system-clinical-and-logistic-pharmaceutical-services
#8
Roni Leibowitz, Shahar Aflalo, Ornit Cohen, Ahuva Lustig
BACKGROUND: The drug inventory in the hospital consumes a large part of the hospital's budget. Classic drug management is based on weekly visits of the pharmacist in the departments, writing an order and dispensing it. This method is wasteful in terms of sending a bulk of drugs that will not necessarily be utilized, and it is also inefficient in terms of human resources. The unit-dose method, which is more advanced, is based on filling out individual prescriptions for each of the inpatients in the department...
August 2016: Harefuah
https://www.readbyqxmd.com/read/28524243/bulk-filled-posterior-resin-restorations-based-on-stress-decreasing-resin-technology-a-randomized-controlled-6-year-evaluation
#9
Jan W V van Dijken, Ulla Pallesen
This randomized study evaluated a flowable resin composite bulk-fill technique in posterior restorations and compared it intraindividually with a conventional 2-mm resin composite layering technique over a 6-yr follow-up period. Thirty-eight pairs of Class II restorations and 15 pairs of Class I restorations were placed in 38 adults. In all cavities a single-step self-etch adhesive (Xeno V) was applied. In the first cavity of each pair, the flowable resin composite (SDR) was placed, in bulk increments of up to 4 mm...
May 19, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28520426/reconsideration-of-rheology-of-silica-filled-natural-rubber-compounds
#10
Yihu Song, Lingbin Zeng, Qiang Zheng
There is substantial progress along with giant debate in reinforcement mechanisms in relation to structured filler network and heterogeneously retarded polymer dynamics while the dissipation behaviors have never been clarified for nanoparticles filled polymers. Herein dynamic rheological behaviors of silica filled natural rubber were investigated. Master curves of linear rheology in the hydrodynamics regime and those of nonlinear Payne effect at a predetermined frequency were created, disclosing a leading role of dynamically retarded bulk rubbery phase to in the hydrodynamics regime and a leading role of molecular disentanglement in the bulk phase to the nonlinear Payne effect...
May 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28512178/particulate-generation-mechanisms-during-bulk-filling-and-mitigation-via-new-glass-vial
#11
Christopher Timmons, Chi Yuen Liu, Stefan Merkle
Contamination with foreign particulate matter continues to be a leading cause of parenteral drug recalls, despite extensive control and inspection during manufacturing. Glass is a significant source of particulate matter contamination; however, the mechanism, source, and quantification have not been extensively analyzed. Quantification of particulate matter generation with lab simulations suggests that glass-to-glass contact on the filling line produces large quantities of glass particles of various sizes. A new strengthened glass vial with a low-coefficient of friction (low-COF) surface is proposed to address this root cause of glass particle generation...
May 15, 2017: PDA Journal of Pharmaceutical Science and Technology
https://www.readbyqxmd.com/read/28510375/the-effect-of-irradiation-distance-on-light-transmittance-and-vickers-hardness-ratio-of-two-bulk-fill-resin-based-composites
#12
Zahra Almuallem, Sinead McDonnell, Antoniella Busuttil-Naudi, Ario Santini
The aims of this study were to assess the light energy transmission and Vickers hardness (VH) ratio of two bulk-fill resin-based composites (RBCs) (Tetric EvoCeram and Filtek) cured at different distances between the light curing unit's (LCU) tip and the surface of the restoration (T-S) using either a Bluephase G2, Bluephase® 'turbo tip' or Bluephase Style LCU. Samples were cured from the top at T-S distances of 2mm, 6mm and 10mm for 20 seconds. A MARC-Resin-Calibrator™ recorded the transmitted irradiance reaching the bottom of the sample, in real time...
December 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28509507/a-practice-based-clinical-evaluation-of-a-bulk-fill-restorative-material
#13
F J Trevor Burke, Russell John Crisp, Ditesh Panchal, Philip Redfearn, Peter Sands
OBJECTIVE: To evaluate the handling, by a group of practice-based researchers, of a recently introduced bulk fill resin-based composite restorative material, Filtek Bulk Fill Restorative (3M ESPE). METHODS: The twelve selected evaluators were sent explanatory letters, a pack of the material under investigation to use for 8 weeks, and a questionnaire. RESULTS: The evaluators rated the ease of use of the bulk fill restorative the same as the previously used posterior composite material...
September 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28503477/color-stability-of-bulk-fill-and-incremental-fill-resin-based-composites-polished-with-aluminum-oxide-impregnated-disks
#14
Uzay Koc-Vural, Ismail Baltacioglu, Pinar Altinci
OBJECTIVES: This study aimed to evaluate the color stability of bulk-fill and nanohybrid resin-based composites polished with 3 different, multistep, aluminum-oxide impregnated finishing and polishing disks. MATERIALS AND METHODS: Disk-shaped specimens (8 mm in diameter and 4 mm in thickness) were light-cured between two glass slabs using one nanohybid bulk-fill (Tetric EvoCeram, Ivoclar Vivadent), one micro-hybrid bulk-fill (Quixfil, Dentsply), and two nanohybrid incremental-fill (Filtek Ultimate, 3M ESPE; Herculite XRV Ultra, Kerr) resin-based composites, and aged by thermocycling (between 5 - 55℃, 3,000 cycles)...
May 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28498676/intermolecular-interactions-in-highly-disordered-confined-dense-n2
#15
Mario Santoro, Federico A Gorelli, Roberto Bini, Julien Haines
Molecular nitrogen is a benchmark system for condensed matter and, in particular, for looking at universal properties of strongly confined dense systems. We conducted Raman and X-ray diffraction measurements on a dense and disordered form of molecular nitrogen subnanoconfined in a noncatalytic pure SiO2 zeolite under pressure, up to 50 GPa. In this form, N2-N2 interactions and, consequently, distances are found to be very close to those of bulk N2 and intramolecular interactions progressively weaken upon increasing pressure...
May 15, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28488671/actively-addressed-single-pixel-full-colour-plasmonic-display
#16
Daniel Franklin, Russell Frank, Shin-Tson Wu, Debashis Chanda
Dynamic, colour-changing surfaces have many applications including displays, wearables and active camouflage. Plasmonic nanostructures can fill this role by having the advantages of ultra-small pixels, high reflectivity and post-fabrication tuning through control of the surrounding media. However, previous reports of post-fabrication tuning have yet to cover a full red-green-blue (RGB) colour basis set with a single nanostructure of singular dimensions. Here, we report a method which greatly advances this tuning and demonstrates a liquid crystal-plasmonic system that covers the full RGB colour basis set, only as a function of voltage...
May 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28487739/food-simulating-organic-solvents-for-evaluating-crosslink-density-of-bulk-fill-composite-resin
#17
Neveen M Ayad, Hala A Bahgat, Eman Hussain Al Kaba, Maryam Hussain Buholayka
Objectives. To evaluate crosslink densities of two bulk fill composite resins and determine if the used Food Simulating Organic Solvent (FSOS) affected them. Methods. Forty specimens were prepared from SureFill and SonicFill bulk fill composite resins, 20 each. All specimens were stored dry for 24 h. Each group was divided into 2 subgroups: stored in ethanol (E) 75% or in methyl ethyl ketone (MEK) 100% for 24 h. Crosslink density was evaluated by calculating the difference between the Vickers hardness numbers of the specimens stored dry and after their storage in FSOS...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28475075/transdental-curing-of-bulk-filled-restorations-a-closer-look
#18
Mark I Malterud
No abstract text is available yet for this article.
May 2017: General Dentistry
https://www.readbyqxmd.com/read/28467259/in-vitro-evaluation-of-marginal-adaptation-of-direct-class-ii-composite-restorations-made-of-different-low-shrinkage-systems
#19
C Shahidi, I Krejci, D Dietschi
The present study evaluated the influence of various low-shrinkage restorative systems in class II direct composite restorations following simulated occlusal loading. Forty MOD class II cavities were prepared on freshly extracted human lower third molars with proximal margins located mesially 1.0 mm coronal to and distally 1 mm apical to the cementoenamel junction. The samples were randomly distributed into five experimental groups corresponding to the following restorative systems: a conventional resin composite (Tetric) as active control group, a low-shrinkage composite (Extra Low Shrinkage [ELS]) alone or combined with its corresponding flowable version (ELSflow) used as a 1- to 1...
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28463700/the-surface-pore-integrated-effect-of-soil-organic-matter-on-retention-and-transport-of-pharmaceuticals-and-personal-care-products-in-soils
#20
Qin Qin, Xijuan Chen, Jie Zhuang
This study examines a surface-pore integrated mechanism that allows soil organic matter (SOM) to influence the retention and transport of three representative pharmaceuticals and personal care products (PPCPs)-ibuprofen, carbamazepine, and bisphenol A-in agricultural soil. A series of sorption-desorption batch tests and breakthrough column experiments were conducted using manured and non-manured soils. Results show that SOM could substantially influence the environmental behaviors of PPCPs via two mechanisms: surface-coating and pore-filling...
April 29, 2017: Science of the Total Environment
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