摘要:
A system for reducing power loss in a switched-capacitor converter includes a first and second switched capacitor sub-converter each having a flying capacitor and a first, second, third, and fourth switching device. Each switching device is controlled by one of a first, second, third, and fourth clock signal. The first, second, third and fourth clock signals of the second switched capacitor sub-converter are inverted such that the first switched capacitor sub-converter operates during a first phase and the second switched capacitor converter operates during a second phase that is 1800 degrees out of phase from the first phase. The system also includes a resonant charge sharing portion for coupling a bottom-plate parasitic capacitance of the first switched capacitor sub-converter to a bottom-plate parasitic capacitance of the second switched capacitor converter.
摘要:
A composition of matter, and method of manufacture, of a material having a porous mass including a bound and reduced composite of graphene formed by in-situ reduction of graphene oxide, and either carbon nanotubes or carbon nanofibers. In particular embodiments, the mass is directionally porous, with pores having average length over 10,000 microns and average cross sectional area less than 2500 square microns and more than 25 square microns. In embodiments, heat treatment at between 400 and 2000 degrees Celsius in non-oxidizing atmosphere is used to reduce graphene oxide to graphene while binding the graphene to the carbon nanotubes or nanofibers, in an alternative embodiment graphene oxide is reduced chemically. Graphene and/or graphene oxide is present at a ratio between 2:1 and 1:4 in proportion to carbon nanotubes or nanofibers. The material can be made with porosity 75 to 99 percent.
摘要:
A system for providing monitoring of radiation therapy from a source of pulsed high energy radiation disposed to provide a radiation beam to a treatment zone; a camera for imaging Cherenkov light from the treatment zone; apparatus for preventing interference by room lighting by synchronizing the camera to pulses of the radiation beam; and an image processor adapted to determine extent overlap of the beam area from the images. Additionally an image processor adopted to determine cumulative skin dose in the treatment zone from the images. In a particular embodiment, the processor uses a three-dimensional model of a subject to determine a mapping of image intensity in the images of Cherenkov light to radiation intensity in skin of the subject, to apply the mapping to the images of Cherenkov light to verify skin dose delivered, and to accumulate skin dose by summing the maps of skin dose.
摘要:
Methods for preventing or reducing toxicity of adoptive cell therapy using a population of cells deficient in the expression or activity of GM-CSF, GM-CSF receptor or perforin are provided, as are kits for preparing cells deficient in the expression or activity of GM-CSF, GM-CSF receptor or perforin.
摘要:
A hearing prosthetic has microphones configured to receive audio with signal processing circuitry for reducing noise; apparatus configured to receive a signal derived from a neural interface, and to determine an interest signal when the user is interested in processed audio; and a transducer for providing processed audio to a user. The signal processing circuitry is controlled by the interest signal. In particular embodiments, the neural interface is electroencephalographic electrodes processed to detect a P300 interest signal, in other embodiments the interest signal is derived from a sensorimotor rhythm signal. In embodiments, the signal processing circuitry reduces noise by receiving sound from along a direction of focus, while rejecting sound from other directions; the direction of focus being set according to timing of the interest signal. In other embodiments, a sensorimotor rhythm signal is determined and binned, with direction of audio focus set according to amplitude.
摘要:
A system and method for converting biomass with no substantial pretreatment is disclosed. Combination of a microbial system and the use of mechanical disruption may help achieve high conversion rate without the extra cost and undesirable by-products typically associated with the pretreatment process.
摘要:
Methods and kits for excising HIV-1 DNA in vivo are provided, which employ Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) and CRISPR-Associated (cas) proteins. Vectors harboring nucleic acids encoding one or more guide RNA, wherein said guide RNA hybridizes with a target HIV-1 DNA are also provided.
摘要:
Iron oxide nanoparticles and nanocomposites with organic molecules embedded in their structure, having exceptionally high SAR values, are provided for biological, medical (for example, drug delivery, hyperthermia, etc.) and other uses.
摘要:
A magnetic susceptibility tomographic device has sensitive magnetic sensors about a measurement volume and AC bias coils for providing magnetic fields within the volume. Sensing circuitry reads the sensors, and a processor executes magnetic susceptibility tomography (MST) routines from memory to divide the measurement volume into voxels, to determine differences between applied and measured field strengths of magnetic fields at each voxel and thereby determines magnetic susceptibility of each voxel, and to construct tomographic images representative of magnetic susceptibility as MST images. Embodiments with SQUID and fluxgate sensors are described. Applications to direct measurement of tissue magnetic susceptibility, and to locating and quantifying tagged magnetic nanoparticles are disclosed, including antibody- tagged nanoparticles for use in cancer diagnosis and treatments, and the retrieval of taggant identification codes from an object.