keyword
MENU ▼
Read by QxMD icon Read
search

GPA

keyword
https://www.readbyqxmd.com/read/28328220/shock-wave-chemistry-in-a-metal-organic-framework
#1
Zhi Su, William L Shaw, Yu-Run Miao, Sizhu You, Dana D Dlott, Kenneth S Suslick
Metal-organic frameworks (MOFs) have potential applications as energy absorbing materials for shock wave energy mitigation due to their nanoporosity. Here we have examined km/s laser-driven flyer plate impacts on a prototypical MOF, ZIF-8. We observed particle fragmentation and morphological changes in microcrystals of ZIF-8 at lower shock pressures (≈2.5 GPa), and amorphization and structural collapse at higher pressures (≈8 GPa). High-speed emission spectroscopy revealed that 50 ns after flyer plate impacts, an emission pulse was generated by ZIF-8 resulting from chemical bonds that were broken and subsequently reformed...
March 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28328219/energy-storage-during-compression-of-metal-organic-frameworks
#2
Yu-Run Miao, Zhi Su, Kenneth S Suslick
Practical applications of metal-organic framework (MOF) materials require an in-depth understanding of their mechanical properties. We have investigated the mechanical properties and energy absorption behavior of single crystals of four isostructural UiO-type MOFs under uniaxial compression. In situ nanocompression experiments were used to measure the mechanical behavior of individual MOF nanocrystals under compression within a transmission electron microscope. The plasticity and endothermicity during deformation of MOFs shows a surprising potential for absorption and dissipation of mechanical shock...
March 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28328215/synthesis-and-mechanical-character-of-hexagonal-phase-%C3%AE-wn
#3
Changchun Wang, Qiang Tao, Shushan Dong, Xin Wang, Pinwen Zhu
In this work, high-quality bulk WC-structured WN (δ-WN) was synthesized via an untraditional method and the structure was accurately determined by X-ray diffraction and Rietveld refinement. In the process of synthesizing δ-WN, W2N3 and melamine were used as tungsten source and nitrogen source, respectively. The result of successfully synthesized high-quality δ-WN indicates that our method is an effective route for synthesizing high-quality bulk δ-WN and melamine is a pure nitrogen source for introducing the nitrogen to the metal precursor...
March 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28326043/perceived-academic-control-and-academic-emotions-predict-undergraduate-university-student-success-examining-effects-on-dropout-intention-and-achievement
#4
Lisa Respondek, Tina Seufert, Robert Stupnisky, Ulrike E Nett
The present study addressed concerns over the high risk of university students' academic failure. It examined how perceived academic control and academic emotions predict undergraduate students' academic success, conceptualized as both low dropout intention and high achievement (indicated by GPA). A cross-sectional survey was administered to 883 undergraduate students across all disciplines of a German STEM orientated university. The study additionally compared freshman students (N = 597) vs. second-year students (N = 286)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28323635/magnetic-states-of-mnp-muon-spin-rotation-studies
#5
R Khasanov, A Amato, P Bonfà, Z Guguchia, H Luetkens, E Morenzoni, R De Renzi, N D Zhigadlo
Muon-spin rotation data collected at ambient pressure (p) and at p  =  2.42 GPa in MnP were analyzed to check their consistency with various low- and high-pressure magnetic structures reported in the literature. Our analysis confirms that in MnP the low-temperature and low-pressure helimagnetic phase is characterised by an increased value of the average magnetic moment compared to the high-temperature ferromagnetic phase. An elliptical double-helical structure with a propagation vector [Formula: see text], an a-axis moment elongated by approximately 18% and an additional tilt of the rotation plane towards c-direction by [Formula: see text]-8° leads to a good agreement between the theory and the experiment...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323420/synthesis-and-characterization-of-the-high-pressure-nickel-borate-%C3%AE-nib4o7
#6
Martin K Schmitt, Oliver Janka, Oliver Niehaus, Thomas Dresselhaus, Rainer Pöttgen, Florian Pielnhofer, Richard Weihrich, Maria Krzhizhanovskaya, Stanislav Filatov, Rimma Bubnova, Lkhamsuren Bayarjargal, Björn Winkler, Robert Glaum, Hubert Huppertz
γ-NiB4O7 was synthesized in a high-pressure/high-temperature experiment at 5 GPa and 900 °C. The single-crystal structure analysis yielded the following results: space group P6522 (No. 179), a = 425.6(2), c = 3490.5(2) pm, V = 0.5475(2) nm(3), Z = 6, and Flack parameter x = -0.010(5). Second harmonic generation measurements confirmed the acentric crystal structure. Furthermore, γ-NiB4O7 was characterized via vibrational as well as single-crystal electronic absorption spectroscopy, magnetic measurements, high-temperature X-ray diffraction, differential scanning calorimetry, and thermogravimetry...
March 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28322368/alkaline-earth-metal-mg-polynitrides-at-high-pressure-as-possible-high-energy-materials
#7
Shuli Wei, Da Li, Zhao Liu, Xin Li, Fubo Tian, Defang Duan, Bingbing Liu, Tian Cui
The high-pressure structural evolutionary behaviors of magnesium polynitrides were studied up to 100 GPa using first-principles calculations. Using the unbiased structure searching method, five stable chemical stoichiometries of magnesium polynitrides (MgN, Mg2N3, MgN2, MgN3, and MgN4) were theoretically predicted at high pressures. The predicted MgNx compounds contain a rich variety of polynitrogen forms ranging from charged molecules (one-dimensional bent molecules N3, planar triangle N4 to benzene-like rings N6) to extended polymeric chains (N∞)...
March 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28319866/contrast-enhanced-ultrasound-and-computed-tomography-findings-of-granulomatosis-with-polyangiitis-presenting-with-multiple-intrarenal-microaneurysms-a-case-report
#8
Youe Ree Kim, Young Hwan Lee, Jong-Ho Lee, Kwon-Ha Yoon
Granulomatosis with polyangiitis (GPA) is a systemic disorder that affects small- and medium- sized vessels in many organs. Although the kidneys are the second most commonly involved organ in patients with GPA, its manifestation as multiple intrarenal aneurysms is rare. We report an unusual manifestation of GPA with multiple intrarenal microaneurysms, as demonstrated by contrast-enhanced ultrasound and computed tomography.
March 9, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28318270/prediction-of-stable-ground-state-lithium-polyhydrides-under-high-pressures
#9
Yangmei Chen, Hua Y Geng, Xiaozhen Yan, Yi Sun, Qiang Wu, Xiangrong Chen
Hydrogen-rich compounds are important for understanding the dissociation of dense molecular hydrogen, as well as searching for room temperature Bardeen-Cooper-Schrieffer (BCS) superconductors. A recent high pressure experiment reported the successful synthesis of novel insulating lithium polyhydrides above 130 GPa. However, the results are in sharp contrast to a previous theoretical prediction by the PBE functional that around this pressure range all lithium polyhydrides (LiHn (n = 2-8)) should be metallic...
March 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28317997/evidence-of-a-minority-monoclinic-lanio2-5-phase-in-lanthanum-nickelate-thin-films
#10
L López-Conesa, J M Rebled, D Pesquera, N Dix, F Sánchez, G Herranz, J Fontcuberta, C Magén, M J Casanove, S Estradé, F Peiró
LaNiO3 (LNO) thin films of 14 nm and 35 nm thicknesses grown epitaxially on LaAlO3 (LAO) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) substrates are studied using High Resolution Transmission Electron Microscopy (HRTEM) and High Angle Annular Dark Field (HAADF) imaging. The strain state of the films is studied using Geometric Phase Analysis (GPA). Results show the successful in-plane adaptation of the films to the substrates, both in the compressive (LAO) and tensile (LSAT) cases. Through the systematic analysis of HRTEM superstructure contrast modulation along different crystal orientations, localized regions of the monoclinic LaNiO2...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28306595/update-on-maintenance-therapy-for-granulomatosis-with-polyangiitis-and-microscopic-polyangiitis
#11
Ora Singer, W Joseph McCune
PURPOSE OF REVIEW: The antineutrophilic cytoplasmic antibody (ANCA)-associated vasculitides are a group of rare systemic diseases. The past several years have seen major therapeutic advances in the treatment of granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA). The success rate in induction of remission is high, but reducing the high incidence of relapses remains a therapeutic challenge. RECENT FINDINGS: Studies have shown no improvement in relapse rates in GPA and MPA over the past 2 decades...
March 16, 2017: Current Opinion in Rheumatology
https://www.readbyqxmd.com/read/28306365/ulcerative-granuloma-of-the-eyelid-as-the-initial-manifestation-of-granulomatosis-with-polyangiitis-wegener-s-granulomatosis-a-case-report
#12
Helena Brosa Morros, Olaia Subirà, Montse Gomà Gàllego, Maria José Paúles Villar, Ferran Mascaró Zamora, Maravillas Abia Serrano
A 56-year-old-man presented a 2-month history of chalazion in the eyelids without response to treatment and with an inconclusive biopsy. Laboratory results confirmed the presence of Enterobacter cloacae and Streptococcus gordonii infection. Despite appropriate intravenous antibiotic treatment, clinical worsening was observed. Radical surgical excision and total tarsorrhaphy were performed. Following treatment, the patient was asymptomatic for 6 weeks until he developed acute renal failure, generalised arthralgia, acute hypertensive anterior uveitis, and dacryoadenitis...
March 17, 2017: Orbit
https://www.readbyqxmd.com/read/28303064/accessory-left-gastric-artery-aneurysms-in-granulomatosis-with-polyangiitis-a-case-report-and-literature-review
#13
Toshihide Tomosugi, Takuji Takahashi, Yoshihisa Kawase, Koichi Yoshida, Shogo Hayashi, Takefumi Sugiyama, Mitsuya Shimizu, Michita Shoka, Kohichi Sawaki, Eiji Onishi, Naomi Hayashi, Hidenobu Matsushita, Osamu Okochi
Aneurysm formation is a potential complication of granulomatosis with polyangiitis (GPA), previously known as Wegener's granulomatosis. It is a very rare complication, but immediate diagnosis and therapy should be performed because an aneurysm can be life-threatening if it ruptures. An accessory left gastric artery (ALGA) is also a rare variant gastric artery that may obtain its blood supply from the left hepatic artery and left gastric artery. We herein describe a 57-year-old Japanese man who was diagnosed with GPA complicated by aneurysm rupture in an ALGA...
February 2017: Nagoya Journal of Medical Science
https://www.readbyqxmd.com/read/28301131/bio-inspired-nano-featured-substrates-suitable-environment-for-bone-regeneration
#14
Hassan Rammal, Marie Dubus, Léa Aubert, Fany Reffuveille, Dominique Laurent Maquin, Christine Terryn, Pierre Schaaf, Halima Alem, Grégory Francius, Fabienne Quilès, Sophie C Gangloff, Fouzia Boulmedais, Halima Kerdjoudj
Bone mimicking coatings provide a complex microenvironment in which material, through its inherent properties (such as nanostructure and composition), affects the commitment of stem cells into bone lineage and the production of bone tissue regulating factors, required for bone healing and regeneration. Herein, a bioactive mineral/biopolymers composite made of calcium phosphate/chitosan and hyaluronic acid (CaP-CHI-HA) was elaborated using a versatile simultaneous spray coating of interacting species. The resulting CaP-CHI-HA coating was mainly constituted of bioactive, carbonated and crystalline hydroxyapatite, with 277 ± 98 nm of roughness, 1 μm of thickness and 2...
March 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28300399/pressure-stabilized-superconductive-ionic-tantalum-hydrides
#15
Quan Zhuang, Xilian Jin, Tian Cui, Yanbin Ma, Qianqian Lv, Ying Li, Huadi Zhang, Xing Meng, Kuo Bao
High-pressure structures of tantalum hydrides were investigated over a wide pressure range of 0-300 GPa by utilizing evolutionary structure searches. TaH and TaH2 were found to be thermodynamically stable over this entire pressure range, whereas TaH3, TaH4, and TaH6 become thermodynamically stable at pressures greater than 50 GPa. The dense Pnma (TaH2), R3̅m (TaH4), and Fdd2 (TaH6) compounds possess metallic character with a strong ionic feature. For the highly hydrogen-rich phase of Fdd2 (TaH6), a calculation of electron-phonon coupling reveals the potential high-Tc superconductivity with an estimated value of 124...
March 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28300156/superconductivity-in-hfte5-across-weak-to-strong-topological-insulator-transition-induced-via-pressures
#16
Y Liu, Y J Long, L X Zhao, S M Nie, S J Zhang, Y X Weng, M L Jin, W M Li, Q Q Liu, Y W Long, R C Yu, C Z Gu, F Sun, W G Yang, H K Mao, X L Feng, Q Li, W T Zheng, H M Weng, X Dai, Z Fang, G F Chen, C Q Jin
Recently, theoretical studies show that layered HfTe5 is at the boundary of weak &strong topological insulator (TI) and might crossover to a Dirac semimetal state by changing lattice parameters. The topological properties of 3D stacked HfTe5 are expected hence to be sensitive to pressures tuning. Here, we report pressure induced phase evolution in both electronic &crystal structures for HfTe5 with a culmination of pressure induced superconductivity. Our experiments indicated that the temperature for anomaly resistance peak (Tp) due to Lifshitz transition decreases first before climbs up to a maximum with pressure while the Tp minimum corresponds to the transition from a weak TI to strong TI...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28300067/superfast-assembly-and-synthesis-of-gold-nanostructures-using-nanosecond-low-temperature-compression-via-magnetic-pulsed-power
#17
Binsong Li, Kaifu Bian, J Matthew D Lane, K Michael Salerno, Gary S Grest, Tommy Ao, Randy Hickman, Jack Wise, Zhongwu Wang, Hongyou Fan
Gold nanostructured materials exhibit important size- and shape-dependent properties that enable a wide variety of applications in photocatalysis, nanoelectronics and phototherapy. Here we show the use of superfast dynamic compression to synthesize extended gold nanostructures, such as nanorods, nanowires and nanosheets, with nanosecond coalescence times. Using a pulsed power generator, we ramp compress spherical gold nanoparticle arrays to pressures of tens of GPa, demonstrating pressure-driven assembly beyond the quasi-static regime of the diamond anvil cell...
March 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28298464/the-achilles-tendon-is-mechanosensitive-in-older-adults-adaptations-following-14%C3%A2-weeks-versus-1-5%C3%A2-years-of-cyclic-strain-exercise
#18
Gaspar Epro, Andreas Mierau, Jonas Doerner, Julian A Luetkens, Lukas Scheef, Guido M Kukuk, Henning Boecker, Constantinos N Maganaris, Gert-Peter Brüggemann, Kiros Karamanidis
The aging musculoskeletal system experiences a general decline in structure and function, characterized by a reduced adaptability to environmental stress. We investigated whether the older human Achilles tendon (AT) demonstrates mechanosensitivity (via biomechanical and morphological adaptations) in response to long-term mechanical loading. Thirty-four female adults (60-75 years) were allocated to either a medium-term (14 weeks; N=21) high AT strain cyclic loading exercise intervention or a control group (N=13), with 12 participants continuing with the intervention for 1...
March 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28295682/nanocube-superlattices-of-cesium-lead-bromide-perovskites-and-pressure-induced-phase-transformations-at-atomic-and-mesoscale-levels
#19
Yasutaka Nagaoka, Katie Hills-Kimball, Rui Tan, Ruipeng Li, Zhongwu Wang, Ou Chen
Lead halide perovskites are promising materials for a range of applications owing to their unique crystal structure and optoelectronic properties. Understanding the relationship between the atomic/mesostructures and the associated properties of perovskite materials is crucial to their application performances. Herein, the detailed pressure processing of CsPbBr3 perovskite nanocube superlattices (NC-SLs) is reported for the first time. By using in situ synchrotron-based small/wide angle X-ray scattering and photoluminescence (PL) probes, the NC-SL structural transformations are correlated at both atomic and mesoscale levels with the band-gap evolution through a pressure cycle of 0 ↔ 17...
March 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28295104/wb2-not-a-superhard-material-for-strong-polarization-character-of-interlayer-w-b-bonding
#20
Changchun Wang, Qiang Tao, Shuailing Ma, Tian Cui, Xin Wang, Shushan Dong, Pinwen Zhu
In this work, the structure of WB2 synthesized at high pressure and high temperature (HPHT) was accurately determined by X-ray diffraction and Rietveld refinement. Its asymptotic Vickers hardness (Hv) value is 25.5 GPa which is much lower than the previous theoretical results (36-40 GPa). It is worth noting that the chemical bonds between the W layers and two different kinds of B layers show obvious polarization character based on the results obtained from X-ray photoelectron spectroscopy (XPS) and electron localization functions (ELFs), density of states (DOS), topological analysis of the static electron density and Mulliken population...
March 15, 2017: Physical Chemistry Chemical Physics: PCCP
keyword
keyword
40173
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"