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PubMed Journals Articles About "Topological Crystalline Superconductors Dimensions" RSS

19:34 EDT 19th July 2019 | BioPortfolio

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Showing "Topological crystalline superconductors dimensions" PubMed Articles 1–25 of 1,900+

Atomistic Mechanism of Stress-Induced Combined Slip and Diffusion in Sub-5 Nanometer Sized Ag Nanowires.

With continuous minimization of nano-devices, the dimensions of metallic materials used in nano-devices decrease to a few nanometers. Understanding the structural stability and deformation behavior of these small-sized metallic materials is important for their practical applications. Here we report our atomic-resolution observation of the deformation processes of Ag nanowires with widths of ~ 3 nm. The nanowires under tension experienced plastic deformation via partial dislocation activities, which led to d...


Effect of the Affordable Care Act's Medicaid Expansions on Food Security, 2010-2016.

To examine whether the expansion of Medicaid under the Affordable Care Act (ACA) decreased the prevalence of severe food insecurity. With data on adult respondents to the Food Security Supplement to the Current Population Survey in US states for the years 2010 to 2013 and 2015 to 2016, I used a difference-in-difference design to compare trends in very low food security (VLFS) among low-income childless adults in states that did and did not expand Medicaid in 2014 under the ACA. Among low-income, nonelderl...

The Experiences of Family Caregivers at the End of Life: Suffering, Compassion Satisfaction and Support of Health Care Professionals: Experiences of Caregivers at the End of Life.

A death with dignity is influenced by the quality of care offered to patients. The objective of this study was to identify, through the firsthand experiences and insights of family caregivers, the key elements related to the care offered to patients with a terminal illness at the end of life. This multicenter qualitative study was based on the paradigm of hermeneutic phenomenology. Participants were relatives of patients with terminal illness who had been identified as primary caregivers. Five discussion gr...


Does mindfulness change the mind? A novel psychonectome perspective based on Network Analysis.

If the brain is a complex network of functionally specialized areas, it might be expected that mental representations could also behave in a similar way. We propose the concept of 'psychonectome' to formalize the idea of psychological constructs forming a dynamic network of mutually dependent elements. As a proof-of-concept of the psychonectome, networks analysis (NA) was used to explore structural changes in the network of constructs resulting from a psychological intervention. NA was applied to explore th...

Hydroxamate titanium-organic frameworks and the effect of siderophore-type linkers over their photocatalytic activity.

The chemistry of Metal-Organic Frameworks (MOFs) relies on the controlled linking of organic molecules and inorganic secondary building units to assemble an unlimited number of reticular frameworks. However, the design of porous solids with chemical stability remains still limited to carboxylate or azolate groups. There is a timely opportunity to develop new synthetic platforms that make use of unexplored metal binding groups to produce metal-linker joints with hydrolytical stability. Living organisms use s...

Low Dimensionality, High Robustness in Neural Population Dynamics.

Neuronal populations respond within a small number of relevant dimensions. New research by Trautmann et al. (2019) shows that spike sorting is not necessary to extract the important features of this low-dimensional population signal. Combined responses of multiple neurons (multiunit activity) only generate small changes in the extracted signals.

Direct visualization of single nuclear pore complex proteins using genetically-encoded probes for DNA-PAINT.

The Nuclear Pore Complex (NPC) is one of the largest and most complex protein assemblies in the cell and - among other functions - serves as the gatekeeper of nucleocytoplasmic transport. Unraveling its molecular architecture and functioning has been an active research topic for decades with recent cryogenic electron microscopy and super-resolution studies advancing our understanding of the NPC's complex architecture. However, the specific and direct visualization of single copies of NPC proteins is thus fa...

Global Aromaticity in Macrocyclic Polyradicaloids: Hückel's Rule or Baird's Rule?

Aromaticity is one of the most important concepts in organic chemistry to understand the electronic properties of cyclic π-conjugated molecules. Over a century, different aromaticity rules have been developed and validated. For planar monocyclic conjugated polyenes (also known as []annulenes), they will be aromatic if they contain [4 + 2] π electrons according to Hückel's rule, or antiaromatic if they have [4] π electrons. Topological change from a planar to a half-twisted Möbius strip will lead to [4]...

Facile Electrochemical Activity of Monoclinic Li2MnSiO4 as Potential Cathode for Li-Ion Batteries.

Synthesis of pure single phase Li2MnSiO4 is challenging because of its rich polymorphism. Here, we demonstrate our success in preparing crystalline pure, battery grade monoclinic phase Li2MnSiO4 employing temperature programmed reaction (TPR) technique. The systematic analysis of the electrochemical behavior of Li2MnSiO4 reveals the excellent battery activity in the monoclinic phase, with an initial discharge capacity of ~250 mAh g-1 associated with the reversible intercalation of more than one Li+. The ext...

Unraveling the rapid assembly process of stiff cellulosic fibers from mistletoe berries.

The mucilaginous viscin tissue within mistletoe berries possesses an extraordinary ability to be rapidly processed under ambient conditions into stiff cellulosic fibers (>14 GPa) through simple mechanical drawing. This rapid and extreme transformation process is hydration-dependent and involves an astonishing >200-fold increase in length, providing a relevant role model for efforts to produce advanced composites from cellulose-based structures such as cellulose nanocrystals (CNCs) or cellulose nanofibrils (...

Calculation of molecular vibrational spectra on a quantum annealer.

Until recently molecular energy calculations using quantum computing hardware have been limited to gate-based quantum computers. In this paper, a new methodology is presented to calculate the vibrational spectrum of a molecule on a quantum annealer. The key idea of the method is a mapping of the ground state variational problem onto an Ising or quadratic unconstrained binary optimization (QUBO) problem by expressing the expansion coefficients using spins or qubits. The algorithm is general and represents a ...

Geminiarene: Molecular Scale Dual Selectivity for Chlorobenzene and Chlorocyclohexane Fractionation.

In this work, a new version of macrocyclic arenes, namely geminiarene, has been designed and synthesized for guest complexation and chlorobenzene/chlorocyclohexane mixture separation with excellent dual selectivity. Due to its unique dual/gemini conformational feature, not only chlorocyclohexane can be separated from chlorobenzene with exceeding 97% purity, but also chlorobenzene can be separated from chlorocyclohexane with purity over 88%, and the dual selective fractionation process could be achieved in o...

In situ nano-thermo-mechanical experiment reveals brittle to ductile transition in silicon nanowires.

Silicon (Si) nanostructures are widely used in microelectronics and nanotechnology. Brittle to ductile transition in nanoscale Si is of great scientific and technological interest, but this phenomenon and its underlying mechanism remain elusive. By conducting in situ temperature-controlled nanomechanical testing inside a transmission electron microscope (TEM), here we show that the crystalline Si nanowires under tension are brittle at room temperature, but exhibit ductile behavior with dislocation-mediated ...

Community size and perception of older adults in the Cook Islands.

Attitudes towards aging are often negative, a phenomenon known as ageism. However, personal contact with older adults and intergenerational exchange in the context of close families may mitigate such negative tendencies. So far, these effects have been studied in Western and industrialized contexts. The present study extended this work to the Cook Islands archipelago, a group of islands in the South Pacific characterized by low levels of industrialization and relative isolation from foreign influences. We t...

Inter- and intra-household perceived relative inequality among disabled and non-disabled people in Liberia.

Evidence suggests that people with disabilities are the most marginalised and vulnerable group within any population. However, little is known about the extent of inequality between people with and without disabilities in contexts where the majority of persons experience extreme poverty and hardship. This includes in Liberia, where very little is understood about the lives of disabled people in general. This study uses a multidimensional wellbeing framework to understand perceived relative inequality associ...

Cluster-π Interactions Cause Size-Selective Reactivity of Cationic Silver Clusters with Acetylene: The Distinctive AgCH.

Utilizing a customized multiple-ion laminar flow tube reactor in tandem with a triple quadrupole mass spectrometer (MIFT-TQMS), we report a study of the gas-phase reactivity of Ag clusters with acetylene. Well-resolved Ag clusters (n=1-20) are produced by a self-designed magnetron sputtering source (MagS); however, on their reactions with acetylene under sufficient collisional condition, only Ag[CH] is produced with reasonable intensity. DFT calculations reveal that, Ag clusters do not form strong Ag-C bond...

Confined space self-propagating room temperature synthesis of carbon-encapsulated Fe3O4 nanocrystals and its lithium storage performance.

A self-propagating reaction between ferrocene and iron nitrate nonahydrate that initiated at room temperature is discovered. Amorphous carbon-encapsulated Fe3O4 nanocrystals (Fe3O4@C) can be one-step prepared in an autoclave through this reaction. The equiaxed Fe3O4 nanocrystals have typical dimensions in the range of 5-60 nm with a median size of 24.1 nm, and their weight percent is up to 82.3%. The course of the reaction is recorded, and the formation mechanism of Fe3O4@C with the core-shell structure is ...

Focused Electron Beam Induced Deposition (FEBID) and Post-Growth Purification Using the Heteroleptic Ru Complex (η-CH)Ru(CO)Br.

Focused electron beam induced deposition using the heteroleptic complex (η-CH)Ru(CO)Br as a precursor resulted in deposition of material with Ru content of 23 at%. TEM images indicated a nanogranular structure of pure Ru nanocrystals, embedded into a matrix containing carbon, oxygen and bromine. The deposits were purified by annealing in a reactive 98% N / 2% H atmosphere at 300 ºC, resulting in reduction of contaminants and an increase of Ru content to 83 at%. Although a significant 79% volume loss was f...

Precious Metal-Free Nickel Nitride Catalyst for the Oxygen Reduction Reaction.

With promising activity and stability for the oxygen reduction reaction (ORR), transition metal nitrides are an interesting class of non-platinum group catalysts for polymer electrolyte membrane fuel cells. Here, we report an active thin-film nickel nitride catalyst synthesized through a reactive sputtering method. In rotating disk electrode testing in a 0.1 M HClO electrolyte, the crystalline nickel nitride film achieved high activity and selectivity to four-electron ORR. It also exhibited good stability d...

Microscale Isotopic Variation observed in Uranium Fuel Pellets with implications for Nuclear Forensics.

Until recently, the analysis and identification of nuclear fuel pellets in the context of a nuclear forensics investigation have been mainly focused on macroscopic characteristics such as fuel pellet dimensions, uranium enrichment, and other reactor-specific features. Here we report microscale isotopic heterogeneity observed in different fuel pellet fragments that were characterized in situ by NanoSIMS. The materials analyzed include fuel fragments obtained as part of the Collaborative Materials Exercise (C...

Label-free TOF-SIMS imaging of sulfur producing enzymes inside microglia cells following exposure to silver nanowires.

There are no methods sensitive enough to detect enzymes within cells, without the use of analyte labelling. Here we show that it is possible to detect protein ion signals of three different H2S-synthesizing enzymes inside microglia after pre-treatment with silver nanowires (AgNW) using time of flight-secondary ion mass spectrometry (TOF-SIMS). Protein fragment ions, including the fragment of amino acid (C4H8N+ - 70 amu), fragments of the sulfur producing cystathionine-containing enzymes and the Ag+ ion sign...

Gold Nanotetrapods with Unique Topological Structure and Ultra-Narrow Plasmonic Band as Multifunctional Therapeutic Agents.

Owing to their excellent surface plasmonic properties, Au nanobranches have drawn increasing attention in various bio-applications, such as contrast agents for photoacoustic imaging, nanomedicines for photothermal therapy, and carriers for drug delivery. The monodispersity and plasmonic band width of Au nanobranches are of great importance for the efficacy of those bio-applications. However, it is still a challenge to accurately synthesize size- and shape-controlled Au nanobranches. Here we report a facile ...

Frontal Occipital and Frontal Temporal Horn Ratios: Comparison and Validation of Head Ultrasound-Derived Indexes With MRI and Ventricular Volumes in Infantile Ventriculomegaly.

The purpose of our study was to assess whether linear ventricular dimensions-specifically, the frontal occipital horn ratio (FOHR) and frontal temporal horn ratio (FTHR) obtained from ultrasound (US)-are reliable measures of ventriculomegaly in infants. Our hypothesis was that these US measures would show good correlation with linear ventricular indexes and ventricular volumes obtained from MRI. We retrospectively identified 90 infants (age ≤ 6 months corrected gestational age) with ventriculomegaly from...

Luminescence properties of Yb-doped SrTiO: the significance of the oxygen-titanium charge transfer state on photon downshifting.

Ceramic powders of Sr1-1.5xYbxTiO3 (x = 0.0, 0.0125, 0.025, 0.05 and 0.075) solid solutions were synthesized by the polymeric complex method. The crystal structure, microstructure and optical properties of the powders annealed at 800 °C for 1 h were investigated by X-ray diffraction, scanning electron microscopy, and diffuse reflectance and photoluminescence spectroscopy, respectively. All the solid solutions exhibit a cubic perovskite-like structure. The reflectance spectra show a broadband below 400 nm a...

Viral Hormones: Expanding Dimensions in Endocrinology.

Viruses have developed different mechanisms to manipulate their hosts, including the process of viral mimicry in which viruses express important host proteins. Until recently, examples of viral mimicry were limited to mimics of growth factors and immunomodulatory proteins. Using a comprehensive bioinformatics approach, we have shown that viruses possess the DNA/RNA with potential to encode 16 different peptides with high sequence similarity to human peptide hormones and metabolically important regulatory pr...


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