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https://www.readbyqxmd.com/read/28550312/dependence-of-solidification-for-bi2te3-xsex-alloys-on-their-liquid-states
#1
Yuan Yu, Zhan Wu, Oana Cojocaru-Mirédin, Bin Zhu, Xiao-Yu Wang, Na Gao, Zhong-Yue Huang, Fang-Qiu Zu
The resistivity versus temperature (ρ-T) behaviours of liquid n-type Bi2Te3-x Se x (x = 0.3, 0.45 and 0.6) alloys are explored up to 1050 °C. A clear hump is observed on all ρ-T curves of the three studied Bi2Te3-x Se x melts during the heating process, which suggests that a temperature-induced liquid-liquid structural transition takes place in the melts. Based on this information, the solidification behaviours and microstructures of the alloys with different liquid states are investigated. The samples that experienced liquid structural transition show that the nucleation and growth undercooling degrees are conspicuously enlarged and the solidification time is shortened...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28549598/twist-limits-for-late-twisting-double-somersaults-on-trampoline
#2
M R Yeadon, M J Hiley
An angle-driven computer simulation model of aerial movement was used to determine the maximum amount of twist that could be produced in the second somersault of a double somersault on trampoline using asymmetrical movements of the arms and hips. Lower bounds were placed on the durations of arm and hip angle changes based on performances of a world trampoline champion whose inertia parameters were used in the simulations. The limiting movements were identified as the largest possible odd number of half twists for forward somersaulting takeoffs and even number of half twists for backward takeoffs...
May 16, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28548972/assessment-of-adult-malnutrition-and-prognosis-with-bioelectrical-impedance-analysis-phase-angle-and-impedance-ratio
#3
Henry C Lukaski, Ursula G Kyle, Jens Kondrup
PURPOSE OF REVIEW: Malnutrition affects prognosis in many groups of patients. Although screening tools are available to identify adults at risk for poor nutritional status, a need exists to improve the assessment of malnutrition by identifying the loss of functional tissues that can lead to frailty, compromised physical function, and increased risk of morbidity and mortality, particularly among hospitalized and ill patients and older adults. Bioimpedance analysis (BIA) offers a practical approach to identify malnutrition and prognosis by assessing whole-body cell membrane quality and depicting fluid distribution for an individual...
May 25, 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/28546916/liquid-metal-phagocytosis-intermetallic-wetting-induced-particle-internalization
#4
Jianbo Tang, Xi Zhao, Jing Li, Yuan Zhou, Jing Liu
A biomimetic cellular-eating phenomenon in gallium-based liquid metal to realize particle internalization in full-pH-range solutions is reported. The effect, which is called liquid metal phagocytosis, represents a wet-processing strategy to prepare various metallic liquid metal-particle mixtures through introducing excitations such as an electrical polarization, a dissolving medium, or a sacrificial metal. A nonwetting-to-wetting transition resulting from surface transition and the reactive nature of the intermetallic wetting between the two metallic phases are found to be primarily responsible for such particle-eating behavior...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28544159/simultaneous-measurement-of-t1-b1-and-pharmacokinetic-model-parameters-using-active-contrast-encoding-ace-mri
#5
Jin Zhang, Kerryanne Winters, Olivier Reynaud, Sungheon Gene Kim
The aim of this study was to assess the feasibility of combining dynamic contrast enhanced-magnetic resonance imaging (DCE-MRI) with the measurement of the radiofrequency (RF) transmit field B1 and pre-contrast longitudinal relaxation time T10 . A novel approach has been proposed to simultaneously estimate B1 and T10 from a modified DCE-MRI scan that actively encodes the washout phase of the curve with different amounts of T1 and B1 weighting using multiple flip angles and repetition times, hence referred to as active contrast encoding (ACE)-MRI...
May 22, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28541037/phase-behavior-of-salt-free-polyelectrolyte-gel-surfactant-systems
#6
Martin Andersson, Per Hansson
Ionic surfactants tend to collapse the outer parts of polyelectrolyte gels, forming shells that can be used to encapsulate other species including protein and peptide drugs. In this paper the aqueous phase behaviour of covalently crosslinked polyacrylate networks containing sodium ions and dodecyltrimethylammonium ions as counterions is investigated by means of swelling isotherms, dye staining, small-angle x-ray scattering and confocal Raman spectroscopy. The equilibrium state is approached by letting the networks absorb pure water...
May 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28539585/natural-convection-flow-of-a-nanofluid-in-an-inclined-square-enclosure-partially-filled-with-a-porous-medium
#7
A I Alsabery, A J Chamkha, H Saleh, I Hashim
This work analyses free convection flow of a nanofluid in an inclined square enclosure consisting of a porous layer and a nanofluid layer using the finite difference methodology. Sinusoidal temperature boundary conditions are imposed on the two opposing vertical walls. Nanofluids with water as base and Ag or Cu or Al2O3 or TiO2 nanoparticles are considered for the problem. The related parameters of this study are the Darcy number, nanoparticle volume fraction, phase deviation, amplitude ratio, porous layer thickness and the inclination angle of the cavity...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28537738/a-peptoid-square-helix-via-synergistic-control-of-backbone-dihedral-angles
#8
Benjamin Craig Gorske, Emily M Mumford, Charles G Gerrity, Imelda Ko
The continued expansion of the fields of macromolecular chemistry and nanoscience has motivated the development of new secondary structures that can serve as architectural elements of innovative materials, molecular machines, biological probes, and even commercial medicines. Synthetic foldamers are particularly attractive systems for developing such elements because they are specifically designed to facilitate synthetic manipulation and functional diversity. However, relatively few predictive design principles exist that permit both rational and modular control of foldamer secondary structure, while maintaining the capacity for facile diversification of displayed functionality...
May 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28537310/tailoring-phase-transition-temperatures-in-perovskites-via-a-site-vacancy-generation
#9
Thomas A Whittle, William R Brant, James R Hester, Qinfen Gu, Siegbert Schmid
The structures across the Sr0.8Ti0.6-xZrxNb0.4O3, 0 ≤ x ≤ 0.6, defect perovskite series were investigated using complementary synchrotron X-ray and neutron powder diffraction data. The locations of second order compositional and temperature dependent phase transitions between the high symmetry cubic Pm3[combining macron]m phase and the lower symmetry tetragonal I4/mcm phase were determined. Deviation of the oxygen x coordinate from the high symmetry value and the B-O-B bond angle from 180° as well as the tetragonal strain squared were each found to be suitable order parameters to monitor the transitions...
May 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28537308/catalytically-active-ceria-supported-cobalt-manganese-oxide-nanocatalysts-for-oxidation-of-carbon-monoxide
#10
Xu Wang, Lin-Ying Du, Meng Du, Chao Ma, Jie Zeng, Chun-Jiang Jia, Rui Si
A low-concentration cobalt (∼6 at%) and manganese (∼3 at%) bimetallic oxide catalyst supported on ceria nanorods (CoMnOx/CeO2), as well as its related single metal oxide counterparts (CoOx/CeO2 and MnOx/CeO2) was synthesized via a deposition-precipitation approach. The fresh samples after air-calcination at 400 °C were tested under the reaction conditions of CO oxidation, and showed the following order of reactivity: CoMnOx/CeO2 > CoOx/CeO2 > MnOx/CeO2. X-ray diffraction (XRD) and transmission electron microscopy (TEM) data identified that the structure of the CeO2 support was maintained during deposition of metal (Co, Mn) ions while the corresponding vis-Raman spectra verified that more oxygen vacancies were created after deposition-precipitation than those in pure ceria nanorods...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537223/structural-evolution-behavior-of-manganese-monophosphide-under-high-pressure-experimental-and-theoretical-study
#11
Zhenhai Yu, Wei Wu, Pengchao Lu, Jinggeng Zhao, Jinguang Cheng, Qingyang Hu, Ye Yuan, Xin Li, Cuiying Pei, Fengjiao Chen, Zhipeng Yan, Shuai Yan, Ke Yang, Jian Sun, Jianlin Luo, Lin Wang
The influence of external pressure on the structural properties of manganese monophosphides (MnP) at room temperature has been studied using in situ angle dispersive synchrotron x-ray powder diffraction (AD-XRD) with a diamond anvil cell. The crystal structure of MnP is stable between 0 to 15 GPa. However, the compressibility of b-axis is much larger than those of a- and c-axes. From this result we suggested that the occurrence of superconductivity in MnP was induced by suppression of the long-range antiferromagnetically ordered state rather than a structural phase transition...
May 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28535359/association-between-nutrition-status-and-survival-in-elderly-patients-with-colorectal-cancer
#12
Katia Barao, Mariana Abe Vicente Cavagnari, Patricia Silva Fucuta, Nora Manoukian Forones
BACKGROUND: Aging patients with cancer have a higher risk of mortality and treatment-associated morbidity than younger patients. Nutrition status may play an important role in cancer mortality. We aimed to evaluate the survival time of elderly patients with colorectal cancer and its association with body mass index (BMI), the patient-generated subjective global assessment (PG-SGA), and phase angle (PA). MATERIALS AND METHODS: BMI, PG-SGA, and PA were determined for all patients (n = 250) at first assessment...
May 1, 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28534501/electronic-evidence-of-temperature-induced-lifshitz-transition-and-topological-nature-in-zrte5
#13
Yan Zhang, Chenlu Wang, Li Yu, Guodong Liu, Aiji Liang, Jianwei Huang, Simin Nie, Xuan Sun, Yuxiao Zhang, Bing Shen, Jing Liu, Hongming Weng, Lingxiao Zhao, Genfu Chen, Xiaowen Jia, Cheng Hu, Ying Ding, Wenjuan Zhao, Qiang Gao, Cong Li, Shaolong He, Lin Zhao, Fengfeng Zhang, Shenjin Zhang, Feng Yang, Zhimin Wang, Qinjun Peng, Xi Dai, Zhong Fang, Zuyan Xu, Chuangtian Chen, X J Zhou
The topological materials have attracted much attention for their unique electronic structure and peculiar physical properties. ZrTe5 has host a long-standing puzzle on its anomalous transport properties manifested by its unusual resistivity peak and the reversal of the charge carrier type. It is also predicted that single-layer ZrTe5 is a two-dimensional topological insulator and there is possibly a topological phase transition in bulk ZrTe5. Here we report high-resolution laser-based angle-resolved photoemission measurements on the electronic structure and its detailed temperature evolution of ZrTe5...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28534391/understanding-electron-transport-in-disk-shaped-triphenylene-tris-naphthaleneimidazole-s-through-structural-modification-and-theoretical-investigation
#14
Yue Zhang, David A Hanifi, M Paz Fernandez-Liencres, Liana M Klivansky, Biwu Ma, Amparo Navarro, Yi Liu
Disk-shaped molecules with large aromatic π-surface are a class of organic semiconductors of which the charge carrier transport properties could be greatly facilitated by preferred intermolecular stacking of the π-surfaces. The optical and electronic properties are not only determined by the core aromatic structure of these disk-shaped molecules, but also strongly dependent on the sidechains, which directly impact the molecular self-assembly behavior in condensed phases. Triphenylene-tris(naphthaleneimidazole) (TP-TNI) is a recently reported n-type semiconductor featuring a large π-core and branched sidechains with an electron transporting mobility reaching 10-4 cm2V-1s-1...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534297/single-frequency-impedance-analysis-on-reduced-graphene-oxide-screen-printed-electrode-for-biomolecular-detection
#15
Rajesh, Shobhita Singal, Ravinder K Kotnala
A biofunctionalized reduced graphene oxide (rGO)-modified screen-printed carbon electrode (SPCE) was constructed as an immunosensor for C-reactive protein (CRP) detection, a biomarker released in early stage acute myocardial infarction. A different approach of single frequency analysis (SFA) study was utilized for the biomolecular sensing, by monitoring the response in phase angle changes obtained at an optimized frequency resulting from antigen-antibody interactions. A set of measurements were carried out to optimize a frequency where a maximum change in phase angle was observed, and in this case, we found it at around 10 Hz...
May 22, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28533981/effects-of-knee-sleeves-on-coordination-of-lower-limb-segments-in-healthy-adults-during-level-walking-and-one-leg-hopping
#16
Chang-Yong Ko, Yunhee Chang, Bora Jeong, Sungjae Kang, Jeicheong Ryu, Gyoosuk Kim
The evaluation of multisegment coordination is important in gaining a better understanding of the gait and physical activities in humans. Therefore, this study aims to verify whether the use of knee sleeves affects the coordination of lower-limb segments during level walking and one-leg hopping. Eleven healthy male adults participated in this study. They were asked to walk 10 m on a level ground and perform one-leg hops with and without a knee sleeve. The segment angles and the response velocities of the thigh, shank, and foot were measured and calculated by using a motion analysis system...
2017: PeerJ
https://www.readbyqxmd.com/read/28532737/decision-making-process-related-to-treatment-and-management-in-korean-women-with-breast-cancer-finding-the-right-individualized-healthcare-trajectory
#17
Kkotbong Kim, Jinhyang Yang
BACKGROUND: After being diagnosed with breast cancer, women must make a number of decisions about their treatment and management. When the decision-making process among breast cancer patients is ineffective, it results in harm to their health. Little is known about the decision-making process of breast cancer patients during the entire course of treatment and management. OBJECTIVES: We investigated women with breast cancer to explore the decision-making processes related to treatment and management...
June 2017: Applied Nursing Research: ANR
https://www.readbyqxmd.com/read/28532026/high-performance-hydrogen-sensor-based-on-mn-implanted-zno-nanowires-array-fabricated-on-ito-substrate
#18
A Renitta, K Vijayalakshmi
In the present research, we propose a novel approach for the detection of hydrogen gas using Mn implanted ZnO nanowires fabricated onto ITO coated glass substrate by chemical spray pyrolysis deposition. The effect of Mn concentration on the structural, optical and morphological properties of ZnO films were investigated. X-ray diffraction studies showed that the Mn implanted ZnO films were grown as a polycrystalline hexagonal wurtzite phase without any impurities. The (101) peak position of ZnO-Mn films was shifted towards a lower angle with increasing Mn concentration...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530761/drop-spreading-on-a-superhydrophobic-surface-pinned-contact-line-and-bending-liquid-surface
#19
Yanbin Wang, Joseph Eugene Andrews, Liangbing Hu, Siddhartha Das
In this study, we employ molecular dynamics (MD) simulations to probe the spreading of a drop on a superhydrophobic (SH) surface. The SH surface consists of nanopillars and the drop spreads while being in the Cassie-Baxter (CB) state on the nanopillared surface. Most remarkably, unlike the spreading on non-SH surfaces, we witness that the spreading on SH surfaces is not dominated by the motion of the three-phase contact line (TPCL). Rather, the TPCL remains pinned at the edge of a nanopillar and the spreading is ensured by the liquid surface or the liquid-vapor interface (of this pinned TPCL) bending down and wetting the solid adjacent to the TPCL...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530404/role-of-crystallization-in-the-morphology-of-polymer-non-fullerene-acceptor-bulk-heterojunctions
#20
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
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