Read by QxMD icon Read


Jing Fan, Shin-Hyun Kim, Zi Chen, Shaobing Zhou, Esther Amstad, Tina Lin, David A Weitz
Compressed monodisperse emulsions in confined space exhibit highly ordered structures. The influence of the volume fraction and the confinement geometry on the organized structures is investigated and the mechanism by which structural transition occurs is studied. Based on the understanding of ordering behavior of compressed emulsions, a simple and high-throughput method to fabricate monodisperse polyhedral microgels using the emulsions as the template is developed. By controlling the geometry of the confined spaces, a variety of shapes such as hexagonal prism, Fejes Toth honeycomb prism, truncated octahedron, pyritohedron, and truncated hexagonal trapezohedron are implemented...
June 26, 2017: Small
Wen-Chao Chen, Yuan Zhou, Shun-Li Yu, Wei-Guo Yin, Chang-De Gong
Quantum confinement and interference often generate exotic properties in nanostructures. One recent highlight is the experimental indication of a magnetic phase transition in zigzag-edged graphene nanoribbons at the critical ribbon width of about 7 nm [G. Z. Magda et al., Nature \textbf{514}, 608 (2014)]. Here we show theoretically that with further increase in the ribbon width, the magnetic correlation of the two edges can exhibit an intriguing oscillatory behavior between antiferromagnetic and ferromagnetic, driven by acquiring the positive coherence between the two edges to lower the free energy...
June 24, 2017: Nano Letters
Lei Mei, Cong-Zhi Wang, Liu-Zheng Zhu, Zeng-Qiang Gao, Zhi-Fang Chai, John K Gibson, Wei-Qun Shi
The reaction of uranyl nitrate with terephthalic acid (H2TP) under hydrothermal conditions in the presence of an organic base, 1,3-(4,4'-bispyridyl)propane (BPP) or 4,4'-bipyridine (BPY), provided four uranyl terephthalate compounds with different entangled structures by a pH-tuning method. [UO2(TP)1.5](H2BPP)0.5·2H2O (1) obtained in a relatively acidic solution (final aqueous pH, 4.28) crystallizes in the form of a noninterpenetrated honeycomb-like two-dimensional network structure. An elevation of the solution pH (final pH, 5...
June 23, 2017: Inorganic Chemistry
Xiaoxuan Ma, Jun Hu, Bicai Pan
Search for low-dimensional materials with unique electronic properties is important for the development of electronic devices in nano scale. Through systematic first-principles calculations, we found that the band gaps of the two-dimensional honeycomb monolayers and one-dimensional single-walled nanotubes of IIB-VI semiconductors (ZnO, CdO, ZnS and CdS) are nearly chirality-independent and weakly diameter-dependent. Based on analysis of the electronic structures, it was found that the conduction band minimum is contributed by the spherically symmetric $s$ orbitals of cations and the valence band maximum is dominated by the in-plane d<sub>xy</sub>-p<sub>y</sub> and d<sub>x<sup>2</sup>-y<sup>2</sup></sub>-p<sub>x</sub> hybridizations...
June 21, 2017: Nanotechnology
Petar Milovanovic, Danijela Djonic, Michael Hahn, Michael Amling, Björn Busse, Marija Djuric
OBJECTIVES: Parallel with body growth and development, bone structure in non-adults is reorganized to achieve the particular design observed in mature individuals. We traced the changes in three-dimensional trabecular microarchitectural design during the phases of locomotor maturation to clarify how human bone adapts to mechanical demands. MATERIALS AND METHODS: Micro-CT was performed on biomechanically-relevant subregions of the proximal femur (medial, intermediate and lateral neck regions, intertrochanteric region, metaphyseal region) from early postnatal period to late childhood...
June 20, 2017: American Journal of Physical Anthropology
Minjae Kim, Sang Min Lee, Jae-Woo Song, Kyung-Hyun Do, Hyun Joo Lee, Soyeoun Lim, Jooae Choe, Kye Jin Park, Hyo Jung Park, Hwa Jung Kim, Joon Beom Seo
OBJECTIVE: To retrospectively investigate whether prone CT improves identification of honeycombing and classification of UIP patterns in terms of interobserver agreement and accuracy using pathological results as a reference standard. MATERIALS AND METHODS: Institutional review board approval with waiver of patients' informed consent requirement was obtained. HRCTs of 86 patients with pathologically proven UIP, NSIP and chronic HP between January 2011 and April 2015 were evaluated by 8 observers...
June 2017: European Journal of Radiology
L Z Zhang, F Zhai, Kyung-Hwan Jin, B Cui, Bing Huang, Zhiming Wang, J Q Lu, Feng Liu
Tunable spin transport in nanodevices is highly desirable to spintronics. Here, we predict existence of quantum spin Hall effects and tunable spin transport in As-graphane, based on first-principle density functional theory and tight binding calculations. Monolayer As-graphane is constituted by using As adsorbing on graphane with honeycomb H vacancies. Owing to the surface strain, monolayer As-graphane nanoribbons will self-bend toward the graphane side. The naturally curved As-graphane nanoribbons then exhibit unique spin transport properties, distinctively different from the flat ones, which is a two-dimensional topological insulator...
June 26, 2017: Nano Letters
Yi-Zhen Huang, Gang Su
The continuous imaginary-time quantum Monte Carlo method with the worm update algorithm is applied to explore the ground-state properties of the spin-1/2 Heisenberg model with antiferromagnetic (AF) coupling J>0 and ferromagnetic (F) coupling J^{'}<0 along zigzag and armchair directions, respectively, on honeycomb lattice. It is found that by enhancing the F coupling J^{'} between zigzag AF chains, the system is smoothly crossover from one-dimensional zigzag spin chains to a two-dimensional magnetic ordered state...
May 2017: Physical Review. E
Bo-Lin Jian, Chao-Chung Peng
Due to the direct influence of night vision equipment availability on the safety of night-time aerial reconnaissance, maintenance needs to be carried out regularly. Unfortunately, some defects are not easy to observe or are not even detectable by human eyes. As a consequence, this study proposed a novel automatic defect detection system for aviator's night vision imaging systems AN/AVS-6(V)1 and AN/AVS-6(V)2. An auto-focusing process consisting of a sharpness calculation and a gradient-based variable step search method is applied to achieve an automatic detection system for honeycomb defects...
June 15, 2017: Sensors
William W Newcomb, Juan Fontana, Dennis C Winkler, Naiqian Cheng, J Bernard Heymann, Alasdair C Steven
Many viruses migrate between different cellular compartments for successive stages of assembly. The HSV-1 capsid assembles in the nucleus and then transfers into the cytoplasm. First, the capsid buds through the inner nuclear membrane, becoming coated with nuclear egress complex (NEC) protein. This yields a primary enveloped virion (PEV) whose envelope fuses with the outer nuclear membrane, releasing the capsid into the cytoplasm. We investigated the associated molecular mechanisms by isolating PEVs from US3-null-infected cells and imaging them by cryo-electron microscopy and tomography...
June 13, 2017: MBio
Leila Mehrvar, Hamidreza Hajihosseini, Hadi Mahmoodi, H Tavassoli, Morteza Fathipour, Seyed Majid Mohseni
Proposing a novel processing sequence for the fabrication artificial nanostructures is in high demand for various applications. In this paper, we report on a fine-tune nano-machining technique for the fabrication of 3D hollow nanostructures. This technique is originated based on redeposition effect in electron beam lithography patterning and in conjunction with Ar dry etching. Versatility of this technique has been successfully examined by a variety patterns, including honeycomb structure, double ring array, nanotube array, cone array and crescent array and a variety of metals, such as: Au, Ag and Pt...
June 12, 2017: Nanotechnology
Jitendra Premjibhai Parmar, Chander Mohan, Maulik Vora
BACKGROUND: Dengue fever is a major public health problem with an increased incidence in recent years. Gall bladder wall thickening has been reported as one of the most common findings in dengue fever. There is a paucity of literature regarding the various patterns of gall bladder wall thickening in dengue fever and their significance in predicting the severity of disease. METHODOLOGY AND SIGNIFICANT FINDINGS: Out of 93 seropositive patients included in the study, 54 patients with dengue fever had gall bladder wall thickening...
April 2017: Ultrasound International Open
Makoto Kobayashi, Hiroyuki Akiho
Electricity production from coal fuel with minimizing efficiency penalty for the carbon dioxide abatement will bring us sustainable and compatible energy utilization. One of the promising options is oxy-fuel type Integrated Gasification Combined Cycle (oxy-fuel IGCC) power generation that is estimated to achieve thermal efficiency of 44% at lower heating value (LHV) base and provide compressed carbon dioxide (CO2) with concentration of 93 vol%. The proper operation of the plant is established by introducing dry syngas cleaning processes to control halide and sulfur compounds satisfying tolerate contaminants level of gas turbine...
June 6, 2017: Journal of Environmental Management
Kevin H Chen, Kelsey A Corro, Stephanie P Le, James S Nowick
This paper describes the supramolecular assembly of a macrocyclic β-sheet containing residues 16-22 of the β-amyloid peptide, Aβ. X-ray crystallography reveals that the macrocyclic β-sheet assembles to form double-walled nanotubes, with an inner diameter of 7 nm and outer diameter of 11 nm. The inner wall is composed of an extended network of hydrogen-bonded dimers. The outer wall is composed of a separate extended network of β-barrel-like tetramers. These large peptide nanotubes pack into a hexagonal lattice that resembles a honeycomb...
June 21, 2017: Journal of the American Chemical Society
Shude Liu, Kalimuthu Vijaya Sankar, Aniruddha Kundu, Ming Ma, Jang-Yeon Kwon, Seong Chan Jun
Transition metal-based hetero-nanoparticles are attracting extensive attention in electrode material design for supercapacitors owing to their large surface-to-volume ratios and inherent synergies of individual components; however, they still suffer from limited interior capacity and cycling stability due to simple geometric configurations, low electrochemical activity of the surface, and poor structural integrity. Developing an elaborate architecture that endows a larger surface area, high conductivity, and mechanically robust structure is a pressing need to tackle the existing challenges of electrode materials...
June 8, 2017: ACS Applied Materials & Interfaces
Ruomeng Yu, Yongzheng Shi, Dongzhi Yang, Yaxin Liu, Jin Qu, Zhong-Zhen Yu
Multifunctional graphene oxide (GO)/chitosan (CS) aerogel microspheres (GCAMs) with honeycomb-cobweb and radially oriented microchannel structures are prepared by combining electrospraying with freeze-casting to optimize adsorption performances of heavy metal ions and soluble organic pollutants. The GCAMs exhibit superior adsorption capacities of heavy metal ions of Pb(II), Cu(II), and Cr(VI), cationic dyes of methylene blue (MB) and Rhodamine B, anionic dyes of methyl orange and Eosin Y, and phenol. It takes only 5 min to reach 82 and 89% of equilibrium adsorption capacities for Cr(VI) (292...
June 21, 2017: ACS Applied Materials & Interfaces
Tun Wu, Jie Yuan, Bo Song, Yu-Sheng Chen, Mingzhao Chen, Xiaobo Xue, Qianqian Liu, Jun Wang, Yi-Tsu Chan, Pingshan Wang
Self-assembly of a metallo-organic ligand, composed of an inner uncomplexed 120°-bis(terpyridine) and an outer extended free 120°-bis(terpyridine) linked by a triple 〈-tpy-Ru(2+)-tpy-〉 connector, and complexed with Zn(2+), gave rise to a discrete planar supramolecular honeycomb patterned fractal. The central metallo-hexagon was surrounded by six identical metallo-hexagons which perfectly mimicked the natural simple honeycomb structure.
June 7, 2017: Chemical Communications: Chem Comm
Tae Iwasawa, Tamiko Takemura, Koji Okudera, Toshiyuki Gotoh, Yuma Iwao, Hideya Kitamura, Tomohisa Baba, Takashi Ogura, Mari S Oba
PURPOSE: To compare computer-aided diagnostic results with histological findings obtained by surgical biopsy and evaluate whether subpleural lesion volumes can aid identification of idiopathic pulmonary fibrosis (IPF). MATERIALS AND METHODS: We retrospectively analyzed computed tomography (CT) images of 79 patients (43 with fibrosing nonspecific interstitial pneumonia (fNSIP) and 36 with IPF) using the Gaussian Histogram Normalized Correlation (GHNC) system. We determined the H-pattern based on honeycomb and/or fibrosis with traction bronchiectasis on CT, and measured the H-pattern volume ratio at the biopsy sites and in the subpleural area...
May 2017: European Journal of Radiology
Qing Han, Jian-Cai Liu, Yue Wen, Li-Juan Chen, Jun-Wei Zhao, Guo-Yu Yang
A family of unprecedented tellurotungstate-based organotin-rare-earth (RE) heterometallic hybrids [H2N(CH3)2]6H12Na2 {[Sn(CH3)W2O4(IN)][(B-α-TeW8O31)RE(H2O) (Ac)]2}2·25H2O [RE = Ce(III) (1), Pr(III) (2), Nd(III) (3), Sm(III) (4), Eu(III) (5), Gd(III) (6), Tb(III) (7); HIN = isonicotinic acid, HAc = acetic acid] were synthesized and characterized by elemental analyses, IR spectra, UV spectra, thermogravimetric analyses, powder X-ray diffraction, and single-crystal X-ray diffraction. The polyoxoanionic skeletons {[Sn(CH3)W2O4(IN)][(B-α-TeW8O31)RE(H2O) (Ac)]2}2(20-) of 1-7 are constructed from two symmetrical units {[Sn(CH3)W2O4(IN)][(B-α-TeW8O31)RE(H2O) (Ac)]2}(10-) linked by two acetate connectors, which not only represent the first inorganic-organic hybrid RE-substituted tellurotungstates involving three different organic ligands, but also stand for the first samples of organotin-RE heterometallic polyoxometalate derivatives...
June 5, 2017: Inorganic Chemistry
Yumin Leng, Kai Jiang, Wentai Zhang, Yuhui Wang
Metal-mediated interlocking rings won the 2016 Nobel Prize in Chemistry. The metal-directed interlocking rings in macromolecular systems (e.g., proteins) may be similar to the form of Maxwell's electromagnetic waves; the metal ions may shuttle among the rings in the special environment. To verify this hypothesis, we designed a general approach to synthesize the multicolored gold nanoparticles (GNPs) mediated by Au(I)-directed interlocking rings in proteins. The Au(I) ions shuttled among these interlocking rings in the strong alkaline solution...
June 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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"