Near edge structure absorption. Medical search. Frequent questions

CdSe@CdS dot@rods with diameter around 6 nm and length of either 20, 27, or 30 nm and dot@octapods with pod diameters of ∼15 nm and lengths of ∼50 nm were investigated by X-ray absorption spectroscopy. (acs.org)
The local structural environment of all the elements in the CdSe@CdS heterostructures was investigated at the Cd, S, and Se K-edges by taking advantage of the selectivity of X-ray absorption spectroscopy, and was compared to pure reference compounds. (acs.org)
X-ray absorption near-edge spectroscopy (XANES) has been applied to natural rubber in order to study the local environment of sulfur atoms in sulfur crosslinking structures introduced in the vulcanization process. (iucr.org)
Local structure and dynamics of hemeproteins by X-ray absorption near edge structure spectroscopy. (unicatt.it)
X-ray absorption near edge structure (XANES) spectroscopy is a synchrotron radiation technique sensitive to the local structure and dynamics around the metal site of a heme containing protein. (unicatt.it)
We demonstrate x-ray absorption fine structure spectroscopy (XAFS) detected by x-ray beam induced current (XBIC) in single n + -i-n + doped nanowire devices. (lu.se)
Their activation in hydrogen was followed by in situ X-ray diffraction, ambient pressure X-ray photoelectron spectroscopy, and X-ray absorption near edge structure. (psi.ch)
We use surface-sensitive combinatorial near-edge x-ray absorption fine structure spectroscopy (combi-NEXAFS) to measure the position-dependent concentration and molecular orientation of SFO's in the molecular gradients on surfaces. (nist.gov)
The combination of atomic force microscopy, near -edge X-ray absorption fine structure (NEXAFS) spectroscopy and and infrared absorption spectroscopy reveals stucture more detailed than what can be revealed using conventional X-ray diffraction techniques. (nist.gov)
Theory-guided X-ray absorption spectroscopy at the boron K-edge reveals molecular-level distinctions between specific boron-NMDG complexes (i.e., monochelate, bischelate) and informs macroscopic transport models. (aps.org)
Arsenate [As(V)] and arsenite [As(III)] sorption at the solid-water interface of activated carbon impregnated with zirconyl nitrate (Zr-AC) was investigated using X-ray absorption spectroscopy (XAS) and surface complexation modeling. (ufz.de)
We will therefore apply our standard UHV surface science techniques available to us such as Scanning Tunnelling Microscopy (STM), High Resolution Core Level Spectroscopy (HRCLS), Low-Energy Electron Diffraction (LEED), SXRD, Near-Edge X-ray Absorption Fine Structure spectroscopy (NEXAFS), Temperature-Programmed Desorption (TPD) and Reflection Absorption Infra-Red Spectroscopy (RAIRS) before entering the realm of operando environments. (lu.se)

XANES name was invented in 1980 by Antonio Bianconi to indicate strong absorption peaks in X-ray absorption spectra in condensed matter due to multiple scattering resonances above the ionization energy. (wikipedia.org)
Soft x-ray absorption spectra are usually measured either through the fluorescent yield, in which emitted photons are monitored, or total electron yield, in which the sample is connected to ground through an ammeter and the neutralization current is monitored. (wikipedia.org)
Finally we analyze the K-edge absorption spectra of amorphous silicon. (unicam.it)
Photochromic materials can switch between two states with different absorption spectra, and thus different color appearance, under the influence of light irradiation. (ugent.be)
The spectra show similar oscillations around the edge, which shows that the XBIC is limited by the primary absorption. (lu.se)
Investigation of spectral evolution during dipping reveals not only the structure and properties of the outer accretion disk, but also the nature and geometry of the emission regions, since the requirement to fit non-dip and several dip spectra strongly constrains emission models. (aanda.org)

Advances in detection techniques and theoretical/computational platforms in the last 15years allowed the use of XANES as a quantitative probe of the key structural determinants driving functional changes, both in a concerted way with protein crystallography and EXAFS (extended X-ray absorption fine structure), or as a stand-alone method to apply in the crystal state as well as in solution. (unicatt.it)
Zr K -edge EXAFS data indicate that arsenate tetrahedra form monodentate mononuclear surface complexes with free hydroxyl groups of zirconyl dodecahedra, whereby each bidentate nitrate group is exchanged by up to two arsenate groups. (ufz.de)
The QM/MM calculations were further supported by multireference calculations of the MCO spectroscopic properties20 and combined extended X-ray absorption fine- structure EXAFS/QM/MM calculations.21 This has led to the consensus reaction mechanism depicted in Fig. 1. (lu.se)

The fundamental phenomenon underlying XANES is the absorption of an x-ray photon by condensed matter with the formation of many body excited states characterized by a core hole in a selected atomic core level (refer to the first Figure). (wikipedia.org)
We report the experimental extraction of the multiple-scattering contribution to the K-edge x-ray-absorption near-edge structure spectrum (XANES) of crystalline silicon. (unicam.it)
Co-K-edge and Re-LIII-edge X-ray absorption near edge structure (XANES), X-ray powder diffraction (XRPD), transmission electron microscopy (TEM) and H 2 chemisorption were used to provide insight into structural transformations that the catalyst experiences during a month of operation in a semi-commercial FTS plant. (sintef.no)
As K -edge XANES results showed the presence of only As(V) on adsorption regardless of the initial As oxidation state. (ufz.de)

NR consists of cis -1,4-polyisoprene forming an amorphous structure that undergoes rapid change into crystal form when stress is applied. (iucr.org)
The chemical bonding structure of ultrananocrystalline diamond (UNCD)/hydrogenated amorphous carbon (a-C:H) composite films prepared by pulsed laser deposition was examined by near-edge X-ray absorption fine-structure (NEXAFS), X-ray photoemission, and Fourier transform infrared (FTIR) spectroscopies. (elsevierpure.com)
The amorphous nature of the glass sample is responsible for a high dielectric loss, leading to efficient microwave absorption and consequently lower effective microwave power and an increase in sample temperature which leads to further reduction of the electron relaxation time. (weizmann.ac.il)

It is indicated from X-ray diffraction patterns that the Mg-Fe-O and Mg-Ni-O samples have the spinel and rocksalt structures, respectively. (nature.com)
To gain deeper understanding on a relationship between the electrode properties and the crystal structure of the Mg-Fe-O, the crystal structure is investigated by a Rietveld refinement using a synchrotron X-ray diffraction profile and an analysis on total correlation functions. (nature.com)
The X-ray diffraction analysis revealed that all doped and undoped SnO 2 samples had a rutile-type tetragonal structure. (hindawi.com)
The marvel of X-ray crystallography is the beauty and precision of the atomic structures deduced from diffraction patterns. (iucr.org)
In favorable circumstances, which are not at all atypical, the number of unique reflections in the diffraction from a crystal exceeds the number of parameters needed to define its atomic structure, often manyfold overdeterminatively. (iucr.org)
However, since the atomic parameters relate nonlinearly to diffraction patterns, structure solution requires having an initial model within the radius of convergence of a minimization procedure that can relate the atomic model to the diffraction data. (iucr.org)
For complicated structures, such as those of biological macromolecules, suitable initial models are built to fit electron-density distributions from Fourier syntheses, which require phase angles as well as the diffraction amplitudes. (iucr.org)
X-ray diffraction analysis proved the kesterite structure of films. (banglajol.info)

The CZTS films provided high optical absorption coefficient (2.92x104cm-1) and average band gap energy (1.58 eV). (banglajol.info)

Structural evidence for the sorption of Ni(II) atoms on the edges of montmorillonite clay minerals. (psi.ch)
Electronic supplementary information (ESI) available: Protein coordinates and the point charges on all the atoms in the MM region (in PDB format) and the equilibrium geometries of the quantum region for all of the studied structures. (lu.se)

The XBIC and the x-ray fluorescence signals were detected simultaneously as a function of the excitation energy near the Ga K absorption edge at 10.37 keV. (lu.se)
ICG has a peak absorption and fluorescence in the near infrared range. (medscape.com)

Type 1, which is known to be important in the extended x-ray-absorption fine-structure range, has a similar importance in the x-ray-absorption near-edge structure range, while type 2 is important above the edge only when the bond distances are less than 1.6. (biu.ac.il)
A polarized X-ray absorption fine structure study. (psi.ch)
A novel method by which to calculate the near edge X-rayabsorption fine structure region of the X-ray absorption spectrum has been derived and implemented. (diva-portal.org)
The nitrogen 1s near edge X-ray absorption fine structure (NEXAFS) of gallium nitride (GaN) shows a strong natural linear dichroism that arises from its anisotropic wurtzite structure. (mendeley.com)

Analysis of the energy absorbed across a spectrum of x-ray energies/wavelengths to determine the chemical structure and electronic states of the absorbing medium. (bvsalud.org)
Analysis of the oscillations observed in an x-ray absorption spectrum that begin just above the absorption edge (i.e. the point on the spectrum where the amount of x-ray absorption suddenly increases) to determine or evaluate the chemical structure of the absorbing surface. (bvsalud.org)

In the absorption edge region of metals, the photoelectron is excited to the first unoccupied level above the Fermi level. (wikipedia.org)

The rearrangement of the electrons due to an initial stimulus (for example the absorption of a sunlight photon) evolves on an extremely short timescale, typically only a few hundred attoseconds (1 attosecond =0.000 000 000 000 000 001 s). (lu.se)

This research establishes fundamental structure/property rules for boron selectivity that could lead to new material designs for water purification membranes. (aps.org)

A) Electron density profile r(x,y) of the 2-D unit cell for complexes formed by the specifically active AMO-2 and DOPG:DOPE = 20:80 lipid membranes confirm the inverted hexagonal structure. (stanford.edu)

In industrial manufacturing, polymer composites have high energy absorption capacity, specific strength and stiffness. (techscience.com)

The purpose of this paper is to present a calculation of the maximum Energy Absorption Capacity of steel plates subjected to uniform lateral or patch loading. (onepetro.org)
It is the object of the work reported herein, to estimate the energy absorption capacity of a plate up to the initiation of fracture propagation, under Uniformly Distributed Loading, as well as patch loading. (onepetro.org)
Various formulations have been considered for the estimation "of the Energy Absorption Capacity of the impact area of the Ship Hull during a Collision. (onepetro.org)
In this paper a methodology for the determination of the maximum energy absorption capacity under VOL or Patch load is presented. (onepetro.org)
SnO 2 with a tetragonal structure has an energy bandgap of about 3.6 eV at room temperature [ 2 ]. (hindawi.com)
By means of the local surface nanocrystallization that enables to change the material on local positions, an innovative embedded multi-cell (EMC) thin-walled energy absorption structures with local surface nanocrystallization is proposed in this paper. (techscience.com)
Results reveal that after optimizing the local surface nanocrystallization layout, the specific energy absorption (SEA) is increased by 50.78% compared with the untreated counterpart. (techscience.com)
This method provides a guidance for the design of new energy absorption devices. (techscience.com)
As a good energy absorption device, metal thin-walled structure is widely used in energy absorption devices such as spacecraft landing device, subway front end underframe, aircraft bird impact protection device and automobile bumper system. (techscience.com)
It has the advantages of high energy absorption performance, light weight and easy manufacturing. (techscience.com)
The research on thin-walled energy absorbing structures by researchers is not limited to single material or cross section. (techscience.com)
To improve the energy absorption performance of thin-walled structure, the composite tubes and metal tubes (aluminum alloy, low carbon steel, low carbon steel) have been studied according to the different material compositions and sectional types. (techscience.com)
1 ] carried out experiments to study the linen fabric reinforced composite pipes filled with aluminum foam, experimental results showed that the foam filled tube exhibited higher energy absorption and better crashworthiness during impact, which can be designed in similar manners with the traditional tubular energy absorber. (techscience.com)
2 ] studied the mechanical properties of CFRP tubes steel tube and aluminum tube filled with aluminum foam and aluminum honeycomb through axial quasi-static tests, results showed that the energy absorption and load capacity increased with the rising of circular radius. (techscience.com)
3 ] selected the composite skeleton structure and aluminum foam to fill the thin-walled tube, it was found that the specific energy absorption is increased by 32% by filling the mixture of the skeleton and the aluminum foam compared to that of the single tube, the mixture filling also better than filling skeleton and aluminum foam separately. (techscience.com)
Since the width and height of thin-walled metal tubes are far greater than the thickness, the numerical simulation and experiments were carried out on different cross-sections of circular, triangular, square, hexagonal and other polygonal tubes to study the energy absorption. (techscience.com)
5 ] proposed a kind of non-convex polygonal tube, compared with the numerical simulation results of ordinary square tube, the specific energy absorption and impact force efficiency of this square tube were significantly improved. (techscience.com)
6 ] studied 12-side star tube and 16-side star tube, it was proved that the average impact force of 12-side star tube was increased by 48.5% compared with the polygonal tube, while the energy absorption of 16-side star tube increased little. (techscience.com)
Tests are conducted under a range of impact-related environments, from assessing structures on their velocities, temperatures and energy absorption rates. (newswire.co.kr)
Innovative lightweight structures designed to absorb impact energy can be also used in helmets for sport, riding motorcycles, as well as horseback riding. (newswire.co.kr)
Dr. Rafael Santiago, Lead Researcher on the Energy Absorption team at AMRC, noted that the Impact Lab is fully compliant with international safety regulations and will explore new materials to analyze their impact and blast properties. (newswire.co.kr)

Atomic structure determination is prominent among these, and is arguably pre-eminent. (iucr.org)

We aim to analyze the molecular structure and crosslinks of sulfur for better understanding of the physical properties of rubber and to share our findings with the rubber research and industry in Thailand. (iucr.org)

These structures can be described as made of a CdSe dot and a CdS rod, both in the wurtzite phase with a high crystallinity of both the core and the rod. (acs.org)

Developing novel materials and device architectures to further enhance the efficiency of polymer solar cells requires a fundamental understanding of the impact of chemical structures on photovoltaic properties. (uni-potsdam.de)
Chemical reactions and complex phenomena occurring in liquids or solids are determined at the most fundamental level by their electronic structure and dynamics. (lu.se)

We define general purpose coordinates which facilitate computational structure search in cluster and material science. (warwick.ac.uk)

Serous, hemorrhagic, or fibrovascular RPE detachments reveal focal RPE elevations with shadowing of the structures beneath the elevated areas. (medscape.com)

To establish a guideline for development of novel positive-electrode materials with better electrochemical properties, most of the previous works paid special attention on the crystal structures since diffusion mechanisms of Mg 2+ in the electrode materials must be related to their atomic configurations. (nature.com)
In addition, some studies focused on a Mg/ M ratio and investigated effects of the ratio on electrochemical properties and crystal structures. (nature.com)

Reports on the U.S. Bureau of Mines development and testing of an instrinsically safe methane monitor based on differential absorption of infrared light. (cdc.gov)

Having examined over 15,000 entries of calculated formation enthalpies, we find a number of surprising disagreements between theory and experiment regarding the ground state crystal structures and identify over a dozen systems in which novel compounds are expected to form under high pressures. (aps.org)
The researchers first synthesized a prototypical class of antimicrobial compounds, then in part used synchrotron small-angle x-ray scattering at SSRL Beam Line 4-2 to examine the structures made by the synthetic compounds and cell membranes. (stanford.edu)

P(III) ligands, in either the monodentate form or a polydentate/hybrid form, have played a crucial role in the stabilization of elusive species and unusual structures within transition complexes, allowing for the isolation and/or detection of agostic complexes, σ-alkane adducts, non-heteroatom-stabilized alkylidenes, and low-coordinate unsaturated species, among others. (mdpi.com)

A recent dividend has been paid in the success of PDB-trained artificial intelligence approaches for protein structure prediction. (iucr.org)

These heterostructures are prepared by seed-mediated routes, where the structure, composition, and morphology of the CdSe nanocrystals used as a seed play key roles in directing the growth of the second semiconducting domain. (acs.org)

Further although the collision between vessels is a dynamic phenomenon, the analysis of the structure in the vicinity of the impact could be considered as quasi-static because the inertial forces resulting from the accelerations during the impact do not represent a significant portion of the total load equilibrated by the internal forces of the structure. (onepetro.org)

4 ] carried out numerical simulation and experiment on aluminum alloy structure with circular section, results showed that the number of deformation corners increases with the decrease of wall thickness, simulation is consistent with the experimental result. (techscience.com)

The cutting-edge lab is well aligned with AMRC's vision to bring advanced materials to a stage where they are ready to transition from lab to industry. (newswire.co.kr)

In the dipping LMXB, the spectral changes during dipping cannot be described by absorption of one-component emission but require two emission components: point-like blackbody emission identified with the surface of the neutron star plus Comptonized emission from an extended Accretion Disk Corona (ADC) (e.g. (aanda.org)

Previous theory suggests that spatial structure can promote evolution of cooperation, but the diffusion of public goods introduces new phenomena that must be modeled explicitly. (cdc.gov)

The complexity of mechanical detrapping involves the subtle interplay among the elastic properties of the ML phosphor, the piezoelectricity of the phosphor, and the electronic structure of the traps. (ugent.be)
The understanding of electronic properties of complex organic/metal interfaces requires a reliable method for the prediction of their structure and stability. (aps.org)
Boron-based materials have been observed in a remarkable variety of crystal structures with outstanding superconducting, mechanical, and refractory properties. (aps.org)

Fivefold twinned Cu nanowires have achieved a CH 4 FE of 55% due to a high-density of edge sites available on twin boundaries 15 . (nature.com)

Owing to the complicated electronic structure of these low-spin exchange coupled systems, multireference quantum chemical calculations at the complete-active space second-order perturbation theory (CASPT2) were used in an attempt to benchmark the barrier heights obtained at the DFT(B3LYP) level. (lu.se)

In NGC 4298, the telltale pinwheel-like structure is visible, but it's not as prominent as in some other spiral galaxies. (yearinspace.com)

These galaxies are very similar in terms of their structure and contents, but they look different because of their different orientations. (yearinspace.com)
Meanwhile, the Drop Tower studies effects on material structures similar to those in a car crash or on a helmet following an accident. (newswire.co.kr)

Manufacture of eco-friendly CZTS (Cu2ZnSnS4) thin film absorption layer of pure keserite structure for solar cell is far-reaching. (banglajol.info)

The considered crystal structures include known prototypes listed in the ICSD as well as brand-new prototypes found with an evolutionary search implemented in MAISE [1]. (aps.org)

Given that device characteristics depend on many parameters, deriving structure?property relationships has been very challenging. (uni-potsdam.de)

Beyond the role of the unoccupied density of states and matrix elements in single electron excitations, many-body effects appear as an "infrared singularity" at the absorption threshold in metals. (wikipedia.org)
The K-edge of the systems have been considered, and relativistic effects are estimated with use of the Douglas--Kroll scalar relativistic Hamiltonian. (diva-portal.org)

The thin films have intermittent disposal of agglomerated particles with clear-cut edges. (banglajol.info)

Analytical, Diagnostic and Therapeutic Techniques and Equipment3

Phenomena and Processes2

Spectroscopy12

Spectra6

EXAFS3

XANES4

Amorphous3

Diffraction8

Coefficient1

Atoms2

Fluorescence2

Fine structure4

Spectrum2

Photoelectron1

Photon1

Selectivity1

Hexagonal structure1

Composites1

Energy21

Determination1

Analyze1

Wurtzite1

Fundamental2

Cluster1

Reveal1

Electrochemical2

Light1

Compounds2

Detection1

Protein1

Morphology1

Phenomenon1

Experiment1

Transition1

Surface1

Diffusion1

Properties3

High1

Theory1

Prominent1

Similar2

Pure1

Crystal1

Parameters1

Effects2

Thin films1