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PubMed Journals Articles About "Flake Should Have Stood Birtherism" RSS

23:17 EST 19th February 2018 | BioPortfolio

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Showing "Flake Should Have Stood Birtherism" PubMed Articles 1–25 of 54

Surface plasmons in a nanostructured black phosphorus flake.

Recent rediscovered layered material-black phosphorous with a puckered honeycomb atomic structure has experienced an upsurge in demand owing to its exotic physical properties such as layer-independent direct bandgap and linear dichroism. This Letter presents plasmonic properties of the nanostructured BP flake and its unprecedented capability of wide-band photon manipulation within the deep subwavelength scale. Owing to its anisotropic characteristic in band structure and moderate mobility, a strong layer nu...


Giant valley-isospin conductance oscillations in ballistic graphene.

At high magnetic fields the conductance of graphene is governed by the half-integer quantum Hall effect. By local electrostatic gating a pn-junction perpendicular to the graphene edges can be formed, along which quantum Hall channels co-propagate. It has been predicted that if only the lowest Landau level is filled on both sides of the junction, the conductance is determined by the valley (isospin) polarization at the edges and by the width of the flake. This effect remained hidden so far due to scattering ...

Non-Planar nCyclo-1,8-carbazolylenes (n = 3,4,6) and 3Cyclo-1,8-carbazolylenyl B, P, PO, SiPh Complexes.

A new family of non-planar heterocyclic molecules consisting of carbazoles was created. A bowl-shaped cyclodimer, a flake-shaped cyclotrimer, a double-decker-ring-shaped cyclotetramer and a cyclohexamer were synthesized by Ni(0)-mediated one-shot cyclo-oligomerization of 1,8-dibromocarbazole, and were named [n]cyclo-1,8-carbazolylenes (n = 3,4,6). [3]Cyclo-1,8-carbazolylene was found to act as a trivalent tridentate ligand for heteroatoms (B, P, Si), giving flake-shaped complexes. The boron derivative acted...


Inducing and Manipulating Heteroelectronic States in a Single MoS_{2} Thin Flake.

By dual gating a few-layer MoS_{2} flake, we induce spatially separated electronic states showing superconductivity and Shubnikov-de Haas (SdH) oscillations. While the highly confined superconductivity forms at the K/K^{'} valleys of the topmost layer, the SdH oscillations are contributed by the electrons residing in the Q/Q^{'} valleys of the rest of the bottom layers, which is confirmed by the extracted Landau level degeneracy of 3, electron effective mass of 0.6m_{e}, and carrier density of 5×10^{12} ...

Optical gating of black phosphorus for THz detection.

Photoconductive antennas are widely used for time-resolved detection of THz pulses. In contrast to photothermoelectric or bolometric THz detection, the coherent detection allows direct measurement of the electric field transient of a THz pulse, which contains both, spectral and phase information. In this letter we demonstrate for the first time photoconductive detection of free-space propagating THz radiation with thin flakes of a van der Waals material. Mechanically exfoliated flakes of black phosphorus ar...

Tracing social interactions in Pleistocene North America via 3D model analysis of stone tool asymmetry.

Stone tools, often the sole remnant of prehistoric hunter-gatherer behavior, are frequently used as evidence of ancient human mobility, resource use, and environmental adaptation. In North America, studies of morphological variation in projectile points have provided important insights into migration and interactions of human groups as early as 12-13 kya. Using new approaches to 3D imaging and morphometric analysis, we here quantify bifacial asymmetry among early North American projectile point styles to be...

Probing low-energy hyperbolic polaritons in van der Waals crystals with an electron microscope.

Van der Waals materials exhibit intriguing structural, electronic, and photonic properties. Electron energy loss spectroscopy within scanning transmission electron microscopy allows for nanoscale mapping of such properties. However, its detection is typically limited to energy losses in the eV range-too large for probing low-energy excitations such as phonons or mid-infrared plasmons. Here, we adapt a conventional instrument to probe energy loss down to 100 meV, and map phononic states in hexagonal boron ...

Thinking Big.

Most public health measures languished in the 85th Texas Legislature, but those for mental health care stood out as a giant exception. Lawmakers passed more than a dozen bills aimed at improving mental health care. And at a time when most state budgets were slashed, funding for mental health care rose - by a lot.

Why the name "Erasmus" for an hospital ?

Why the name "Erasmus" for an hospital ? Apart for local circumstances, there are far more obvious reasons for this choice. Erasmus was in close contact with the medical world. Indeed, he suffered all his life from more or less severe diseases and had therefore frequent contacts with doctors. Also, the ideas he was defending stood for the principle of free inquiry before its time. For these various reasons giving the name « Erasmus » to the university clinics of the Free University of Brussels (ULB) was a...

Standing on a sliding board affects generation of anticipatory and compensatory postural adjustments.

Postural control is compromised in the presence of body instability. We studied anticipatory and compensatory postural adjustments people use to maintain balance while standing on an unstable surface and performing voluntary arm movements. Nine healthy participants stood on a sliding board (that was either locked and as such motionless or unlocked and as such free to move in the anterior-posterior direction) and performed fast bilateral arms flexion. Arm acceleration, bilateral electromyographic activity (E...

Prevention of Post-ERCP Pancreatitis Is More Than Just Suppositories and Stents.

In this issue of the Journal, Professor Elmunzer provides an outstanding overview of the variable methods of prevention of post-ERCP pancreatitis (PEP) (1). We all recognize the importance of this topic given its morbidity for our patients. His review succinctly summarizes a wealth of both old and new data underscoring previously identified risk factors for PEP which have stood the test of time. In addition, newer interventions are appraised and placed in an appropriate context. This article is protected by...

New cytotoxic natural products from the mangrove biome: covering the period 2007-2015.

Nowadays, the mangrove biome is considered to be a profound resource of natural products usually possessing cytotoxicity of a broader range. Covering the period 2007-2015, a total of 21 new naturally occurring compounds has stood out. For example, xylogranin B and swietephragmin C were found to exhibit very potent cytotoxic activity against the colon HCT-116 cells reaching IC50 values of 0.05 and 0.06 μM, respectively. Bearing in mind the efficacy of the majority compounds in the preliminary in vitro scre...

Strong electric wave response derived from the hybrid of lotus roots-like composites with tunable permittivity.

Lotus roots-like NiO/NiCo2O4 hybrids derived from Metal-organic frameworks (MOFs) are fabricated for the first time by using flake NiCo-MOF precursors as reactant templates. It was found that a thin sample consisting of 60 wt % NiO/NiCo2O4 hybrids in the wax matrix exhibited an effective microwave absorption bandwidth of 4.2 GHz at the thickness of 1.6 mm. The highest reflection loss of -47 dB was observed at 13.4 GHz for a sample with a thickness of 1.7 mm. Results obtained in this study indicate tha...

Metal-Organic Frameworks for High Charge-Discharge Rate in Lithium-Sulfur Battery.

We report a new method to promote the conductivities of metal-organic frameworks (MOFs) by 5 to 7 magnitudes, thus their potential in electrochemical applications can be fully revealed. This method combines the polarity and porosity advantages of MOFs with the conductive feature of conductive polymer, here, polypyrrole (ppy), to construct ppy-MOF compartments for the confinement of sulfur in Li-S battery. The performances of these ppy-S-in-MOF electrodes excel those of the MOF and ppy counterparts, especial...

Modulation of Quantum Tunneling via a Vertical Two Dimensional Black Phosphorus and Molybdenum Disulfide PN Junction.

Diverse diode characteristics were observed in two-dimensional (2D) black phosphorus (BP) and molybdenum disulfide (MoS2) heterojunctions. The characteristics of a backward rectifying diode, a Zener diode and a forward rectifying diode were obtained from the heterojunction through thickness modulation of the BP flake or back gate modulation. Moreover, tunnel diode with a precursor to negative differential resistance (NDR) can be realized by applying dual gating with a solid polymer electrolyte layer as a to...

Acute effects of whole body vibration on balance in persons with and without chronic ankle instability.

Chronic ankle instability (CAI) is a common condition following ankle injury that is associated with compromised balance. Whole body vibration training (WBVT) programmes are linked with improved balance and function in athletic and non-athletic populations and may improve balance in CAI. Twelve healthy and seven CAI participants completed two randomly assigned interventions. Two Power Plate® platforms were attached back to back using a Theraband®. Participants stood on the active plate and inactive plate ...

Ventilatory response to carbon monoxide during exercise in hypoxia and hypercapnia.

We tested if the addition of CO to inspired gases with different inspired O2 and CO2 fractions (FIO2 and FICO2) stimulates ventilation at rest or during submaximal exercise. We measured minute ventilation (VE) in goats breathing combinations of FIO2 ranging from 0.21 to 0.06 and FICO2 from 0 to 0.05, both with and without inspired CO resulting in carboxyhemoglobin fractions (FHbCO) of 0.02 (no CO added), 0.15, or 0.45. We did this while they stood on a treadmill, walked at 1.4, or trotted at 2.5ms(-1). Hypo...

The origin of the Acheulean. Techno-functional study of the FLK W lithic record (Olduvai, Tanzania).

The Acheulean materials documented in FLK West dated c. 1.7 Ma. are the focus of the present work. An original techno-functional approach is applied here to analyze the origin of Acheulean tools. According to the results, these tools were employed in different functional contexts in which tasks of different durations that transformed resources with different resistances were carried out. The exploitation of large and resistant resources suggests that the economic mechanism governing the manufacture of these...

Evaluation matrix for health promotion programs in socially vulnerable territories.

Health promotion has a set of strategies for advancing health and reducing inequalities. However, evaluating the effectiveness of health promotion programs has been a challenge. This paper shows the development and application of the Evaluation Matrix, constructed with qualitative-quantitative and multidimensional indicators supported by public policies targeting socially vulnerable territories. This is a cross-sectional study with the implementation of a health promotion program in order to develop an Eval...

Three-dimensional Graphene with MoS 2 Nanohybrid as Potential Energy Storage/Transfer Device.

Portable and matured energy storage devices are in high demand for future flexible electronics. Flowery shaped MoS2 nanostructures with porous and flake like morphology was used to study the supercapacitive nature with specific capacitance (C sp ) of 169.37F/g, the energy density of 28.43 Wh/Kg and power density of 10.18 W/Kg. This nanoflower like architecture was decorated on 3D-graphene on Graphite electrode to design the solid-state-supercapacitor prototype device of dimensions of 23.6 × 22.4 ...

Visual dependence affects postural sway responses to continuous visual field motion in individuals with cerebral palsy.

The current study aimed to explore the impact of visual dependence on sensorimotor coupling of postural sway and visual motion in adults and teens with spastic cerebral palsy (CP). We hypothesized that individuals with CP would exhibit greater magnitudes of sway than healthy individuals, and the presence of visual dependence (VD) would produce instability in the direction of visual motion. Participants stood in a virtual environment in which the visual scene remained static or continuously rotated 30 degre...

A robotic system for delivering novel real-time, movement dependent perturbations.

Perturbations are often used to study movement control and balance, especially in the context of falling. Most often, discrete perturbations defined prior to the experiment are used to mimic external disturbances to balance. However, the largest proportion of falls is due to self-generated errors in weight shifting. Inspired by self-generated weight shifting errors, we created a novel, continuous mediolateral perturbation proportional to subjects' mediolateral center of mass movement with minimal delays. Th...

Layer-Tunable Phosphorene Modulated by the Cation Insertion Rate as a Sodium-Storage Anode.

Liquid phase exfoliation of few-layer phosphorene (FL-P) is extensively explored in recent years. Nevertheless, their deficiencies such as ultralong sonication time, limited flake size distribution, and uncontrollable thicknesses are major hurdles for the development of phosphorene-based materials. Herein, electrochemical cationic intercalation has been introduced to prepare phosphorene, through which large-area FL-P without surface functional groups can be efficiently attained (less than 1 h). More importa...

A Honeycomb-Like Co@N-C Composite for Ultra-High Sulfur Loading Li-S Batteries.

Because of the high theoretical capacity of 1675 mAh g-1 and high energy density of 2600 Wh kg-1, respectively, lithium-sulfur batteries are attracting intense interest. However, it remains an enormous challenge to realize high utilizations and loadings of sulfur in cathode for the practical applications of Li-S batteries. Herein, we design a quasi-2D Co@N-C composite with honeycomb architecture as multi-functional sulfur host via a simple sacrificial templates method. The cellular flake with large surface ...

Classification of the Residual Cranial Defects and Selection of Reconstruction Materials.

The cranial defects are complex in nature and are due to various causes. Therefore, there is a need for a common term of reference to these defects. This requirement stood as a prime reason for proposing a classification system for cranial defects. The classification is based on 2 decades of experience in cranioplasty. This efficient and simple way of representation would fill the existing lacunae for a systematic communication on cranial defects. Over the ages the evolution of reconstruction and grafting h...


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