摘要:
Methods, program products, and systems for managing database access privileges using administration groups are described. Administrative functions for managing a database server and administrative functions for managing collections of databases can be separated. Groups of databases can be created on the database server. Tasks for adding and managing multiple databases can be delegated from a server administrator to one or more group administrators who can manage one or more groups of databases. The groups of databases can be stored in various home folders, each home folder corresponding to a group. Management rights on the databases can be determined by the home folders in which the databases are located.
摘要:
An electronic transmitter or receiver employing electromagnetic radiation as a coded signal carrier is described. In the transmitter, the electromagnetic radiation is emitted from ultra-small resonant structures when an electron beam passes proximate the structures. In the receiver, the electron beam passes near ultra-small resonant structures and is altered in path or velocity by the effect of the electromagnetic radiation on structures. The electron beam is accelerated within a series of spiral-shaped anodes to an appropriate current density without the use of a high power supply. Instead, a sequence of low power levels is supplied to the sequence of anodes in the electron beam path. The electron beam is thereby accelerated to a desired current density appropriate for the transmitter or receiver application without the need for a high-level power source.
摘要:
Interferometry system are disclosed that include a detector sub-system including a monitor detector, interferometer optics for combining test light from a test object with primary reference light from a first reference interface and secondary reference light from a second reference interface to form a monitor interference pattern on a monitor detector, wherein the first and second reference interfaces are mechanically fixed with respect to each other and the test light, a scanning stage configured to scan an optical path difference (OPD) between the test light and the primary and secondary reference light to the monitor detector while the detector sub-system records the monitor interference pattern for each of a series of OPD increments, and an electronic processor electronically coupled to the detector sub-system and the scanning stage, the electronic processor being configured to determine information about the OPD increments based on the detected monitor interference pattern.
摘要:
An optical transmitter produces electromagnetic radiation (e.g., light) of at least one frequency (e.g., at a particular color frequency) by utilizing a resonant structure that is excited by the presence a beam of charged particles (e.g., a beam of electrons) where the electromagnetic radiation is transmitted along a communications medium (e.g., a fiber optic cable). In at least one embodiment, the frequency of the electromagnetic radiation is higher than that of the microwave spectrum.
摘要:
A waveguide conduit is constructed and adapted to capture the light emitted by the at least one nano-resonant structure. The nano-resonant structure emits light in response to excitation by a beam of charged particles, The source of charged particles may be an ion gun, a thermionic filament, a tungsten filament, a cathode, a field-emission cathode, a planar vacuum triode, an electron-impact ionizer, a laser ionizer, a chemical ionizer, a thermal ionizer, or an ion-impact ionizer.
摘要:
Nanoantennas are formed on a substrate (e.g., silicon) and generate light via interactions with a charged particle beam, where the frequency of the generated light is based in large part on the periodicity of the “fingers” that make up the nanoantennas. Each finger has typical dimensions of less than 100 nm on the shorter side and typically less than 500 nm on the longer, but the size of the optimal longer side is determined by the electron velocity. The charged particle may be an electron beam or any other source of charged particles. By utilizing fine-line lithography on the surface of the substrate, the nanoantennas can be formed without the need for complicated silicon devices.
摘要:
Devices disclosed according to various embodiments use one or more arrays of atomic magnetometers to directly detection of relaxation of magnetic field induced subatomic precession within a target specimen. The disclosed devices and methods relate to application of utilization of a magnetic sensor with unique properties requiring changes in design, allowing new functions, and requiring alternative analysis methodologies. Various embodiments are also directed to methods for obtaining and processing magnetic signals. These methods may take advantage of the unique spatial arrangement of the atomic magnetometers and the capacity sensors to be used in either a scalar or a vector mode. Various embodiments have advantages over current techniques utilized for imaging of anatomical and non-anatomical structures. Such advantages may include, for example: development of a wearable, portable array, lower power consumption, potential wafer-level fabrication, the potential for development of a more rapid signal, decreased need for development of strong magnetic fields, and lower cost allowing wider availability.
摘要:
A charged particle beam including charged particles (e.g., electrons) is generated from a charged particle source (e.g., a cathode or scanning electron beam). As the beam is projected, it passes between plural alternating electric fields. The attraction of the charged particles to their oppositely charged fields accelerates the charged particles, thereby increasing their velocities in the corresponding (positive or negative) direction. The charged particles therefore follow an oscillating trajectory. When the electric fields are selected to produce oscillating trajectories having the same (or nearly the same) as a multiple of the frequency of the emitted x-rays, the resulting photons can be made to constructively interfere with each other to produce a coherent x-ray source.
摘要:
A waveguide conduit is constructed and adapted to capture the light emitted by the at least one nano-resonant structure. The nano-resonant structure emits light in response to excitation by a beam of charged particles, The source of charged particles may be an ion gun, a thermionic filament, a tungsten filament, a cathode, a field-emission cathode, a planar vacuum triode, an electron-impact ionizer, a laser ionizer, a chemical ionizer, a thermal ionizer, or an ion-impact ionizer.
摘要:
A device includes a transparent conductor formed on a substrate. Electromagnetic radiation (EMR) (such as may be received from an on-chip, ultra-small resonant structure or from an off-chip light source) is directed into the transparent conductive layer. One or more circuits are formed on the transparent conductive layer and are operatively connected thereto to receive at least a portion of the EMR traveling in the transparent conductor. The EMR may be light and may encode a data signal such as a clock signal.