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https://www.readbyqxmd.com/read/28742359/pressure-induced-structural-and-optical-properties-of-inorganic-halide-perovskite-cspbbr3
#1
Long Zhang, Qingxin Zeng, Kai Wang
Perovskite photovoltaic materials are gaining sustained attention because of their excellent photovoltaic properties and extensive practical applicability. In this letter, we discussed the changes in the structure and optical properties of CsPbBr3 under high pressure. As the pressure increases, the band gap initially begun to redshift before 1.0 GPa followed by continuous blue shift until the crystal was completely amorphized. An isostructural phase transition at 1.2 GPa was determined by high-pressure synchrotron X-ray and Raman spectroscopy...
July 25, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28741986/serum-ferritin-as-an-activity-marker-for-granulamotosis-with-polyangiitis
#2
Hamit Kucuk, Ozkan Varan, Berna Goker, Berivan Bitik, Mehmet Akif Ozturk, Seminur Haznedaroglu, Abdurrahman Tufan
BACKGROUND: Serum ferritin correlates well with the activities of systemic lupus erythematosus (SLE) and dermatomyositis, but it has not been previously studied in patients with vasculitis. METHODS: Medical records of granulomatosis with polyangiitis (GPA, Wegener's granulomatosis) patients with at least six months of regular follow-up were evaluated. The activity of GPA was assessed with Birmingham Vasculitis Activity Score for Wegener's Granulomatosis (BVAS/WG)...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/28741948/high-pressure-phases-of-a-s-based-compound-dimethyl-sulfide
#3
Qingmei Zhang, Zhenxing Qin, Xiaozhi Zhan
The high-pressure behavior of dimethyl sulfide was investigated at room temperature by Raman scattering measurements with pressures up to 30.1 GPa. Phase transitions at 1.3, 3.6-5.8, and 17.2 GPa were found and evidenced by the frequency shifts, pressure coefficients and changes in FWHM of related modes. These phase transitions were suggested to result from the changes in the inter- and intra-molecular bonding of the material. Interestingly, the CH3 groups was compelled to be frozen in positions at a relatively low pressure, suggested by the disappearing of the relative modes softening...
July 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28740521/new-quantitative-ultrasound-techniques-for-bone-analysis-at-the-distal-radius-in-hip-fracture-cases-differences-between-femoral-neck-and-trochanteric-fractures
#4
Motoyuki Horii, Hiroyoshi Fujiwara, Ryo Sakai, Koshiro Sawada, Yasuo Mikami, Syogo Toyama, Etsuko Ozaki, Nagato Kuriyama, Masao Kurokawa, Toshikazu Kubo
BACKGROUND: Ample evidence on etiological and pathological differences between femoral neck and trochanteric fracture cases suggests the possibility of individualized treatment. There are many issues related to areal bone mineral density and other quantitative computed tomography parameters of the proximal femur. Although osteoporosis is a systemic problem, little has been reported regarding differences in bone structural parameters, including bone mineral density, between them in regions other than the proximal femur...
January 2017: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/28739316/validation-of-the-disease-specific-gpa-for-patients-with-1-to-3-synchronous-brain-metastases-in-newly-diagnosed-nsclc
#5
Neil M Woody, Matthew D Greer, Chandana A Reddy, Gregory M M Videtic, Samuel T Chao, Erin S Murphy, John H Suh, Liliana Angelov, Gene H Barnett, Michael A Vogelbaum, Kevin L Stephans
BACKGROUND: The disease-specific graded prognostic assessment (DS-GPA) for brain metastases is a powerful prognostic tool but has not been validated for patients with synchronous brain metastases (SBM) in newly diagnosed non-small-cell lung cancer (NSCLC). PATIENTS AND METHODS: We identified patients with newly diagnosed NSCLC with 1 to 3 SBM treated with stereotactic radiosurgery (SRS) between 1997 and 2012. We included patients whose brain metastases were treated with SRS alone or combined SRS and whole-brain radiotherapy (WBRT)...
July 6, 2017: Clinical Lung Cancer
https://www.readbyqxmd.com/read/28737910/raman-and-ir-spectroscopy-studies-on-propane-at-pressures-of-up-to-40-gpa
#6
Daniil Kudryavtsev, Aleksandr Serovaiskii, Elena Mukhina, Anton Kolesnikov, Biliana Gasharova, Vladimir Kutcherov, Leonid S Dubrovinsky
Raman and IR spectroscopy studies on propane were performed at pressures of up to 40 GPa at ambient temperatures using the diamond anvil cell technique. Propane undergoes three phase transitions at 6.4(5) GPa, 14.5(5) GPa, and 26.5(5) GPa in Raman spectroscopy and at 7.0(5) GPa, 14.0(5) GPa and 27.0(5) GPa in IR spectroscopy. The phase transitions were identified using the Raman and IR splitting modes and the appearance or disappearance of peaks, which clearly corresponded to the changes in the frequencies of the modes as the pressure changed...
July 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28736868/high-modulus-low-cost-carbon-fibers-from-polyethylene-enabled-by-boron-catalyzed-graphitization
#7
Bryan E Barton, Michael J Behr, Jasson T Patton, Eric J Hukkanen, Brian G Landes, Weijun Wang, Nicholas Horstman, James E Rix, Denis Keane, Steven Weigand, Mark Spalding, Chris Derstine
Currently, carbon fibers (CFs) from the solution spinning, air oxidation, and carbonization of polyacrylonitrile impose a lower price limit of ≈$10 per lb, limiting the growth in industrial and automotive markets. Polyethylene is a promising precursor to enable a high-volume industrial grade CF as it is low cost, melt spinnable and has high carbon content. However, sulfonated polyethylene (SPE)-derived CFs have thus far fallen short of the 200 GPa tensile modulus threshold for industrial applicability. Here, a graphitization process is presented catalyzed by the addition of boron that produces carbon fiber with >400 GPa tensile modulus at 2400 °C...
July 24, 2017: Small
https://www.readbyqxmd.com/read/28732441/determination-of-the-residual-entropy-of-simple-mixtures-by-monte-carlo-simulation
#8
Eric Detmar, Simin Yazdi Nezhad, Ulrich K Deiters
Extensive Monte Carlo simulations were performed for (neon + krypton) mixtures for temperatures between 200 and 600 K and pressures up to 1 GPa, using Lennard-Jones potentials to describe the intermolecular interactions. The residual entropies were obtained via Widom's insertion method as well as by an integration technique. At high pressures, the residual entropy is, to a very good approximation, a linear function of 1/λ_a, the reciprocal value of the average Monte Carlo displacement parameter that gives the acceptance ratio "a" for translational moves...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28731712/associated-lattice-and-electronic-structural-evolutions-in-compressed-multilayer-res2
#9
Yalan Yan, Chunlin Jin, Jia Wang, Tianru Qin, Fangfei Li, Kai Wang, Yonghao Han, Chunxiao Gao
The transition metal dichalcogenide (TMD) ReS2 is a promising material for optoelectronic devices because of its remarkable quantum yield. Pressure can effectively tune the optoelectronic properties of TMDs through control of the atomic displacement. Here, we systematically investigated the lattice and electronic structural evolutions of compressed multilayer ReS2. Both Raman spectra and first-principles calculations suggest the occurrence of an intralayer phase transition followed by an interlayer transition...
July 21, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28731587/reversible-pressure-controlled-depolymerization-of-a-copper-ii-containing-coordination-polymer
#10
Jack Kay Clegg, Aidan Brock, Katrina Jolliffe, Simon Parsons, Leonard Lindoy, Peter Tasker, Fraser White
A unique pressure-induced Cu-N bond breaking/bond forming reaction is reported. The variation of pressure on a single crystal of a one-dimensional copper(II)-containing coordination polymer (Cu2L2(1-methylpiperazine)2]n, where H2L is 1,1'-(1,3-phenylene)-bis(4,4-dimethylpentane-1,3-dione)), was monitored using single crystal X-ray diffraction with the aid of a diamond anvil cell. At a very low elevated pressure (~0.05 GPa) a remarkable reversible phase change was observed. The phase change results in the depolymerization of the material through the cleavage and formation of axial Cu-N bonds as well as "ring flips" of individual axially coordinated 1-methylpiperazine ligands...
July 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28731208/super-strong-super-stiff-macrofibers-with-aligned-long-bacterial-cellulose-nanofibers
#11
Sha Wang, Feng Jiang, Xu Xu, Yudi Kuang, Kun Fu, Emily Hitz, Liangbing Hu
With their impressive properties such as remarkable unit tensile strength, modulus, and resistance to heat, flame, and chemical agents that normally degrade conventional macrofibers, high-performance macrofibers are now widely used in various fields including aerospace, biomedical, civil engineering, construction, protective apparel, geotextile, and electronic areas. Those macrofibers with a diameter of tens to hundreds of micrometers are typically derived from polymers, gel spun fibers, modified carbon fibers, carbon-nanotube fibers, ceramic fibers, and synthetic vitreous fibers...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28726585/student-bedtimes-academic-performance-and-health-in-a-residential-high-school
#12
Maliah J Wernette, Jan Emory
Inadequate sleep among adolescents is considered an epidemic in the United States. Late night bedtimes could be an important factor in academic performance and health with consequences continuing throughout adulthood. The purpose of this study was to explore the relationships between late night bedtimes, academic performance (grade point average [GPA]), and utilization of health care (school nurse visits) in a residential high school. The data were collected from archival records for one academic semester. The statistical analysis employed the nonparametric Pearson's correlation coefficient ( r) with the standard level of significance (α = ...
August 2017: Journal of School Nursing: the Official Publication of the National Association of School Nurses
https://www.readbyqxmd.com/read/28725204/history-of-childhood-maltreatment-and-college-academic-outcomes-indirect-effects-of-hot-execution-function
#13
Marilyn C Welsh, Eric Peterson, Molly M Jameson
College students who report a history of childhood maltreatment may be at risk for poor outcomes. In the current study, we conducted an exploratory analysis to examine potential models that statistically mediate associations between aspects of maltreatment and aspects of academic outcome, with a particular focus on executive functions (EF). Consistent with contemporary EF research, we distinguished between relatively "cool" EF tasks (i.e., performed in a context relatively free of emotional or motivational valence) and "hot" EF tasks that emphasize performance under more emotionally arousing conditions...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28724931/assessing-the-shock-state-of-the-lunar-highlands-implications-for-the-petrogenesis-and-chronology-of-crustal-anorthosites
#14
J F Pernet-Fisher, K H Joy, D J P Martin, K L Donaldson Hanna
Our understanding of the formation and evolution of the primary lunar crust is based on geochemical systematics from the lunar ferroan anorthosite (FAN) suite. Recently, much effort has been made to understand this suite's petrologic history to constrain the timing of crystallisation and to interpret FAN chemical diversity. We investigate the shock histories of lunar anorthosites by combining Optical Microscope (OM) 'cold' cathodoluminescence (CL)-imaging and Fourier Transform Infrared (FTIR) spectroscopy analyses...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724596/severe-destructive-nasopharyngeal-granulomatosis-with-polyangiitis-with-superimposed-skull-base-pseudomonas-aeruginosa-osteomyelitis
#15
Mitchell S von Itzstein, Jithma P Abeykoon, Daniel D Summerfield, Jennifer A Whitaker
Skull base osteomyelitis in the setting of granulomatosis with polyangiitis (GPA) is rare and entails significant diagnostic challenges. We present a case of a 65-year-old Caucasian man with a history of rheumatoid arthritis, off immunosuppression for 18 months, who presented with 2 years of chronic headaches, severe fatigue, saddle nose deformity and 20-kilogram unintentional weight loss. Maxillofacial CT revealed an extensive destructive sinonasal and erosive skull base process. Laboratory evaluation showed equivocal elevation of antiproteinase 3 antibodies with negative antineutrophil cytoplasmic antibody panel...
July 19, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28722689/compressed-h-sub-3-sub-s-inter-sublattice-coulomb-coupling-in-a-high-i-t-i-sub-c-sub-superconductor
#16
Dale R Harshman, Anthony T Fiory
Upon thermal annealing at or above room temperature (RT) and at high hydrostatic pressure <i>P</i> ~ 155 GPa, sulfur trihydride H<sub>3</sub>S exhibits a measured maximum superconducting transition temperature <i>T</i><sub>C</sub> ~ 200 K. Various theoretical frameworks incorporating strong electron-phonon coupling and Coulomb repulsion have reproduced this record-level <i>T</i><sub>C</sub>. Of particular relevance is that experimentally observed H-D isotopic correlations among <i>T</i><sub>C</sub>, <i>P</i>, and annealed order indicate an H-D isotope effect exponent α limited to values ≤ 0...
July 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28722221/microstructure-and-tensile-properties-of-various-varieties-of-rice-husk
#17
Ziyong Chen, Yangzi Xu, Satya Shivkumar
BACKGROUND: Rice husk is a complex hierarchical assembly of hollow fibers consisting of cellulose, hemicellulose and lignin. In addition, it can also contain pectin and significant amounts of silica. Rice husk can be used in diverse applications and generally in the form of rice husk powder. This study aimed to investigate the structural features and mechanical properties of various varieties of whole rice husks. RESULTS: Rice husk consists of three sections: epidermis, sub-hypodermis and hypodermis...
July 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28722013/stability-of-iron-bearing-carbonates-in-the-deep-earth-s-interior
#18
Valerio Cerantola, Elena Bykova, Ilya Kupenko, Marco Merlini, Leyla Ismailova, Catherine McCammon, Maxim Bykov, Alexandr I Chumakov, Sylvain Petitgirard, Innokenty Kantor, Volodymyr Svitlyk, Jeroen Jacobs, Michael Hanfland, Mohamed Mezouar, Clemens Prescher, Rudolf Rüffer, Vitali B Prakapenka, Leonid Dubrovinsky
The presence of carbonates in inclusions in diamonds coming from depths exceeding 670 km are obvious evidence that carbonates exist in the Earth's lower mantle. However, their range of stability, crystal structures and the thermodynamic conditions of the decarbonation processes remain poorly constrained. Here we investigate the behaviour of pure iron carbonate at pressures over 100 GPa and temperatures over 2,500 K using single-crystal X-ray diffraction and Mössbauer spectroscopy in laser-heated diamond anvil cells...
July 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28720914/examining-the-association-between-the-naplex-pre-naplex-and-pre-and-post-admission-factors
#19
Marie A Chisholm-Burns, Christina A Spivey, Debbie C Byrd, Sharon L K McDonough, Stephanie J Phelps
Objective. To examine the relationship between the NAPLEX and Pre-NAPLEX among pharmacy graduates, as well as determine effects of pre-pharmacy, pharmacy school, and demographic variables on NAPLEX performance. Methods. A retrospective review of pharmacy graduates' NAPLEX scores, Pre-NAPLEX scores, demographics, pre-pharmacy academic performance factors, and pharmacy school academic performance factors was performed. Bivariate (eg, ANOVA, independent samples t-test) and correlational analyses were conducted, as was stepwise linear regression to examine the significance of Pre-NAPLEX score and other factors as related to NAPLEX score...
June 2017: American Journal of Pharmaceutical Education
https://www.readbyqxmd.com/read/28720804/the-lower-pt-limit-of-deep-hydrocarbon-synthesis-by-caco3-aqueous-reduction
#20
E Mukhina, A Kolesnikov, V Kutcherov
The deep abiogenic synthesis of hydrocarbons is possible under the conditions of the asthenosphere. We have found that this process can also occur under the mineral and thermobaric conditions of subducting slabs. We have investigated the abiogenic synthesis of hydrocarbon systems at pressures of 2.0-6.6 GPa and temperatures of 250-600 °C. The determined lower thermobaric limit of the reaction at 280-300 °C and 2-3 GPa corresponds to a depth of 70-80 km during cold subduction. The hydrocarbon fluid formed in the slab can migrate upwards through the network of faults and fractures to form petroleum deposits...
July 18, 2017: Scientific Reports
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