Abstract:
Example devices and methods of MRI scanning are disclosed herein. In an example, an MRI scanning system may include a structure defining a bore within which a subject is to be positioned for scanning. The system may also include a magnet to generate a primary magnetic field within the bore parallel to a longitudinal axis of the bore, and a helical-antenna radio-frequency (RF) coil oriented along the longitudinal axis to surround the subject. In addition, the system may include an RF signal generator to drive the helical-antenna RF coil to generate a circularly polarized (CP) RF magnetic field perpendicular to the longitudinal axis, as well as an RF detector to detect a response signal generated by tissues of the subject in response to the CP RF magnetic field. Also included may be a computing system to create an image of the tissues of the subject based on the detected response signal.
Abstract:
The use of the electride form of 12CaO-7Al2O3, or C12A7, as a low work function electron emitter in a hollow cathode discharge apparatus is described. No heater is required to initiate operation of the present cathode, as is necessary for traditional hollow cathode devices. Because C12A7 has a fully oxidized lattice structure, exposure to oxygen does not degrade the electride. The electride was surrounded by a graphite liner since it was found that the C12A7 electride converts to it's eutectic (CA+C3A) form when heated (through natural hollow cathode operation) in a metal tube.
Abstract:
A method for controlling petroleum hydrocarbon (NAPL) sheen releases resulting from seeps, ebullition and erosion, on water surfaces, is described. An oleophilic bio-Barrier (OBBs), which may include a composite of hydrocarbon sorptive materials through which water is readily conducted, is placed at a groundwater/surface water interface (GSI) for promoting natural aerobic degradation of the intercepted/adsorbed NAPL through natural cycling of aerobic surface water and/or atmospheric oxygen. OBBs may be protected by structural covers (i.e., sand and rock gabions, as examples).
Abstract:
The invention provides methods for the detection of M. tuberculosis proteins in or on exosomes derived from infected individuals. The methods can use a proteomic approach including mass spectroscopy, data mining and multiplex reaction monitoring to quickly examine a large amount of M. tuberculosis proteins to determine the best biomarkers for use in diagnostic tests to identify active TB patients.
Abstract:
A waveguide sensor capable of direct, real-time detection and monitoring of analytes in the vicinity of the waveguide surface without requiring the tagging or labeling of the analyte, is described. Analytic and numerical calculations have predicted that by locally detecting either changes in the evanescent field or changes in the light coupled out of the waveguide as a result of the presence of the analyte, high detection sensitivity will be able to be achieved.
Abstract:
An apparatus and method for measuring the isoelectric pH for materials deposited on or otherwise affixed onto and in contact with an electrode surface, and a method for utilizing the isoelectric pH to form nanometer thickness, self-assembled layers on the material, are described. Forming such layers utilizing information obtained about the isoelectric pH values of the substrate and the coating is advantageous since the growth of the coating is self-limiting because once the surface charge has been neutralized there is no longer a driving force for the solid electrolyte coating thickness to increase, and uniform coatings without pinhole defects will be produced because a local driving force for assembly will exist if any bare electrode material is exposed to the solution. The present self-assembly procedure, when combined with electrodeposition, may be used to increase the coating thickness. Self-assembly, with or without additional electrodeposition, allows intimate contact between the anode, electrolyte and cathode which is required for successful application to solid-state batteries, as an example.
Abstract:
A method includes presenting to an online learner a first question. The method also includes receiving a first answer of the online learner to the first question. The method also includes presenting to the online learner a second question that requests a justification for the first answer. The method also includes receiving a second answer of the online learner to the second question. The method also includes storing, in a learner account of the online learner, the second answer in association with the first answer. The method also includes finding a different second answer of a different online learner and which is associated with a different first answer of the different online learner. The method also includes presenting the different second answer to the online learner.
Abstract:
An interspinous spacer device for the treatment of high-grade spinal disorders is disclosed herein. The interspinous spacer device includes a sliding rod and a base that contains a curved internal track that limits the range of motion and center of rotation of the spinal segments stabilized using the device to the physiological levels of a nondegraded spinal segment.
Abstract:
An apparatus and method for nanopatterning of substrates using the demagnified Talbot effect, wherein: (a) large arrays of nanostructures can rapidly be printed; (b) short extreme ultraviolet wavelengths permits sub-100 nm spatial resolution; (c) the de-magnification factor can be continuously adjusted, that is, continuously scaled; (d) the patterning is the effect of the collective diffraction of numerous tiled units that constitute the periodic array, giving rise to error resistance such that a defect in one unit is averaged over the area of the mask and the print does not show any defects; (e) the Talbot mask does not wear out since the method is non-contact; and (f) the feature sizes on the mask do not have to be as small as the feature sizes desired on the target, are described. The apparatus includes a source of coherent radiation having a chosen wavelength directed onto a focusing optic, the reflected converging light passing through a Talbot mask and impinging on a target substrate.
Abstract:
Systems and methods for depositing complex thin-film alloys on substrates are provided. In particular, systems and methods for the deposition of thin-film Cd1-xMxTe ternary alloys on substrates using a stacked-source sublimation system are provided, where M is a metal such as Mg, Zn, Mn, and Cu.