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Stieltjes-moment-theory technique for calculating resonance width’s. A recently developed method for calculating the widths of atomic and molecular resonances is reviewed. The method uses only square-integrable, L 2basis functions to describe both the resonant and the non- resonant parts of the scattering wave function.
It employs Stieltjes-moment-theory techniques to extract a continuous approximation for the width discrete representation of the background continuum. Its implementation requires only existing atomic and molecular structure codes.
Many-electron effects, such as correlation and polarization, are easily incorporated into the calculation of the width via configuration interaction techniques. Once the width, GAMMA Ehas been determined, the energy shift can be computed by a straightforward evaluation of the required principal-value integral. The main disadvantage of the method is that it provides only the total width of a resonance which decays into more than one channel in a multichannel problem.
A review of the various aspects of the theory is given first, and then representative results that have been obtained with this method for several atomic and molecular resonances are discussed.
Indications and technique of fetal magnetic resonance imaging. Evaluation and confirmation of fetal pathologies previously suspected or diagnosed with ultrasound. Ultrasound and magnetic resonance imaging MRI.
Technique for prenatal fetal examination. Fetal MRI is an established supplementary technique to prenatal ultrasound. Fetal MRI should only be used as an additional method in prenatal diagnostics and not for routine screening. Application of magnetic resonance techniques for imaging tumour physiology. Magnetic resonance MR techniques have the unique ability to measure in vivo the biochemical content of living tissue in the body in a dynamic, non-invasive and non-destructive manner.
MR also permits serial investigations of steady-state tumour physiology and biochemistry, as well as the response of a tumour to treatment. Magnetic resonance imaging MRIMagnetic resonance spectroscopy MRS and a mixture of the two techniques spectroscopic imaging allow some physiological parameters, for example pH, to be ‘imaged’.
Using these methods, information on tissue bioenergetics and sabod membrane turnover, pH, hypoxia, oxygenation, and various aspects of vascularity including blood flow, angiogenesis, permeability and vascular volume can be obtained. In addition, MRS methods can be pir for monitoring anticancer drugs e. The role of these state-of-the-art MR methods in imaging tumour physiology and their potential role in the clinic are discussed. Directory of Open Access Journals Sweden.
Full Text Available Glaucoma is a multifactorial disease that is the leading cause of irreversible blindness.
Recent data documented that glaucoma is not limited to the retinal ganglion cells but that it also extends to the posterior visual pathway. The diagnosis is sl on the presence of signs of glaucomatous optic neuropathy and consistent functional rric field alterations. Rl these functional alterations often become evident when a significant amount of the nerve fibers that compose the optic nerve has been irreversibly lost.
Advanced morphological and functional magnetic resonance MR techniques morphometry, diffusion tensor imaging, arterial spin labeling, and functional connectivity may provide a means for observing modifications induced by this fiber loss, within the optic nerve and the visual cortex, in an earlier stage. The aim of this systematic review was to determine if the use of these advanced MR techniques could offer the possibility of diagnosing glaucoma at an earlier stage than that currently possible.
Determination of contraband using fast neutron resonance technique. It has a number of potential applications, for example, in mining and in the detection of contraband materials such as illicit drugs and explosives.
By moving around the neutron detector experiences neutrons in the form of narrow line beam with different energies as the angle to the neutron source changes. Therefore the fast neutrons scattered from an unknown object are used to determine the elemental content of the object and hence lead to its identification. N, O and other elements in the materials. Atom weight fractions determined from scattering features are dric to neutron interactions in interfering materials surrounding the object.
The simulations demonstrate that the fast neutron resonance technique FNRT provides reliable elemental characterization of bulk materials and has the necessary sensitivity efic distinguish between drugs, explosives and other materials.
Ultrasonography is the preferred diagnostic imaging technique for ddl fetal examination. Nevertheless, circumstances sometimes dictate the use of other techniques in order to analyze fetal structures. The advent of ultra rapid magnetic pro MR sequencing has led to the possibility of doing MR fetal studies, since images are obtained in an extradordiarily short time and are not affected by either maternal or fetal movements.
It does not employ ionizing radiations, it provides high-contrast images and it can obtain such images in any plane of space without being influenced by either the child bearer’s physical characteristics of fetal position. MR provides good quality images of most fetal organs.
It is extremely useful in analysing distinct structures, as well as permitting an evaluation of cervical structures, lungs, diaphragms, intra-abdominal and retroperitoneal structures, and fetal extremities. It can also provide useful information regarding the placenta,umbilical cord, amniotic fluid and uterus.
The objective of this work is to describe MR technique deel applied to intrauterine fetal examination, and to illustrate normal fetal anatomy as manifested by MR and its applications. Resonant laser techniques for combustion and ssbor diagnostics. This thesis presents results from two areas of research.
Firstly, the resonant coherent laser techniques polarization spectroscopy PSdegenerate four-wave mixing DFWM and stimulated emission SE have been developed in the general field of combustion diagnostics. Secondly, laser induced fluorescence LIF has been developed and applied for the visualization of mixture fractions in turbulent non reacting flows.
PS was developed for instantaneous two-dimensional imaging of minor species in flames, the technique being demonstrated on OH and NO.
Various aspects of imaging and of detection in general were investigated. LIF was monitored simultaneously to allow a quantitative comparison between the techniques.
Through a novel experimental approach based on the use of a dual-wavelength dye laser and a diffraction grating the temperature imaging measurements were performed using only one laser and one CCD camera.
A comparison between the two techniques was made. SE was through a crossed-beam arrangement developed for spatially resolved detection of flame species.
Two-dimensional LIF was developed and applied for measuring mixture fractions in the shear layer between two co-flowing turbulent gaseous jets. The technique was further applied in a study of the mixing of a turbulent water jet impinging orthogonally onto a flat surface.
Average concentration fields in the center-plane of the jet was compared with results from large eddy simulations and with data from the literature refs, 48 figs, 5 tabs.
Background estimation techniques in searches for heavy resonances at CMS. Many Beyond Standard Model theories foresee the existence of heavy resonances over 1 TeV decaying into final states that include a high-energetic, boosted jet and charged leptons or neutrinos.
In these very peculiar conditions, Monte Carlo predictions sabr not reliable enough to reproduce accurately the expected Standard Model background. A data-Monte Carlo hybrid approach alpha method has been successfully adopted since Run 1 in searches for heavy Higgs bosons performed by the CMS Collaboration.
By taking advantage of data in signal-free control regions, determined exploiting the boosted jet substructure, predictions are extracted in the signal region. The alpha method and jet substructure techniques are described in detail, along with some recent results obtained with Run 2 data collected by the CMS detector.
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Magnetic resonance techniques for investigation aabor multiple sclerosis. Multiple sclerosis MS is a common neurological rofl which can cause loss of vision and balance, muscle weakness, impaired speech, fatigue, cognitive dysfunction and even paralysis.
The key pathological processes in MS are inflammation, edema, myelin loss, axonal loss and gliosis. Unfortunately, the cause of MS is still not understood and saboor is currently no cure. Conventional MRI has been extremely valuable for the diagnosis and management of people who have MS and also for the assessment of therapies designed to reduce inflammation and promote repair.
While conventional MRI is clearly valuable, it lack pathological specificity and, in some cases, sensitivity to non-lesional pathology. Advanced MR techniques have been developed to provide information that is more sensitive and specific than what is available with clinical scanning. Diffusion tensor imaging and magnetization transfer provide a general but non-specific measure of the pathological state of brain tissue.
MR spectroscopy provides concentrations of brain metabolites which can be related to specific pathologies.
Myelin water imaging was designed to assess brain myelination and has proved useful for measuring myelin loss in MS. To combat MS, it is crucial that the pharmaceutical industry finds therapies which can reverse the neurodegenerative processes which occur in the disease. The challenge for magnetic resonance researchers is to sabir imaging techniques which can provide detailed pathological information relating to the mechanisms of MS therapies.
This paper briefly describes the pathologies of MS and demonstrates how MS-associated pathologies can be followed using both conventional and advanced MR imaging protocols. Novel nuclear magnetic resonance techniques for studying biological molecules. Over the fifty-five year history of Nuclear Magnetic Resonance NMRconsiderable progress has been made in the development of techniques for studying the structure, function, and dynamics of biological molecules.
The majority of this research has involved the development of multi-dimensional NMR experiments for studying molecules in solution, although in recent cmaino a number of groups have begun to explore NMR methods for studying biological systems in the solid-state.
Despite this new effort, a need still exists for the development of techniques that improve sensitivity, maximize information, and take advantage of all the NMR interactions available in biological molecules. In this dissertation, a variety of novel NMR techniques for roof biomolecules are discussed.
Techniques for the production of supercritical and liquid laser-polarized xenon are discussed, as well as the prospects for using optically pumped xenon as a polarizing solvent. In addition, a detailed study of the structure of PrP is presented. PrP is a 54 residue fragment of the prion proteins which, upon mutation and aggregation, can induce prion diseases in transgenic mice. Online monitoring of biofouling using coaxial stub resonator technique. Here we demonstrate the proof-of-principle that a coaxial stub resonator can be used to detect early stages of biofilm formation.
After promising field tests using a stub resonator with a sabot steel inner conductor as sensitive element, the sensitivity of the system was improved by using a. Quantitative magnetic resonance techniques in the evaluation of intracranial tuberculomas. To evaluate intracranial tuberculomas using quantitative magnetic resonance MR techniques such as Ssbor relaxometry, magnetization transfer MTand diffusion-weighted imaging DWI. T2 relaxation times, MT ratios MTRand apparent diffusion coefficient ADC values were calculated edl the center of the lesion, the periphery, perilesional edema, and contralateral normal white matter.
Significant inverse correlations were noted between T2 relaxation values and MTR P Magnetic resonance imaging of the elbow. Normal anatomy, imaging techniqueand osseous abnormalities. Part I of this comprehensive review on magnetic resonance imaging of the elbow discusses normal elbow anatomy and the technical factors involved in obtaining high-quality magnetic resonance images of the elbow.
Tratamiento Ortodóncico y Ortopédico en la Dentición Mixta – McNamara JA
Part I also discusses the role of magnetic resonance imaging in evaluating patients with osseous abnormalities of the elbow. With pod patient positioning and imaging techniquemagnetic resonance imaging can yield high-quality multiplanar images which are useful in evaluating the osseous structures of the elbow.
Camin resonance imaging can detect early osteochondritis dissecans of the capitellum and can be used to evaluate the size, location, stability, and viability of the osteochondritis dissecans fragment. Magnetic resonance imaging can detect early stress injury to the proximal ulna in athletes.
Magnetic resonance imaging can detect radiographically occult fractures of the elbow in both children and adults. Magnetic resonance imaging is also useful in children to further evaluate elbow fractures which are detected on plain-film radiographs.