摘要:
The present invention relates to the transmission of optical signals, and more particularly to wavelength division multiplexers and demultiplexers for optical signals. A wavelength division multiplexer device for use in an optical transmission system comprises a light input, one or more lenses, a substrate, one or more holographic optical elements, and two or more light outputs. The light input, the substrate, and the one or more lenses direct a light beam through the device. The one or more holographic optical elements act as transmission diffraction gratings and spatially separate the input light beam into dispersed light beams. Each light output receives one of the dispersed light beams. Multiple holographic optical elements may be stacked upon one another or separated by a substrate. Additionally, the substrate may comprise edges or parts that are beveled. Finally, the elements of the present invention may be rigidly coupled to each other, without intervening air space.
摘要:
FIG. 1 is a front, top perspective view of a glider exercise device, showing my new design; FIG. 2 is a rear, bottom perspective view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a rear elevation view thereof; FIG. 5 is a left side elevation view thereof; FIG. 6 is a right side elevation view thereof; FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof.
摘要:
Gate control of power semiconductor devices using reduced gate drivers is disclosed. A circuit breaker may include a multitude of transistors, such as insulated gate bipolar transistors (IGBTs), connected in series with one another. Each transistor may be connected to a respective gate resistor. Diodes may be connected between various gate resistors. One or more resistor-capacitor (RC) snubber circuits may be provided in parallel with one or more of the transistors. Likewise, one or more metal-oxide varistors (MOVs) may be connected in parallel to one or more of the transistors. A gate driver (e.g., a single gate drive) may be connected to the one or more diodes and an emitter of at least one of transistors.
摘要:
Methods and apparatuses for manufacturing are disclosed, including (a) providing an apparatus having: a laser; scanner; powder injection system; powder spreading system; dichroic filter; imager-and-processor; and computer; (b) programming the computer with specifications of a sample; (c) using the computer to set initial parameters based on the sample specifications; (d) adjusting a stage to position the sample; (e) focusing and scanning electromagnetic radiation onto the sample while powder is concurrently injected onto the sample in order to deposit a layer; (f) capturing two-dimensional images of the sample and probing the sample to determine whether the deposited layer was manufactured per the specifications; (g) use the computer to adjust the three-dimensional manufacturing parameters based on the determination made in step (f) prior to additively manufacturing a subsequent layer or making repairs; and (h) repeating steps (d), (e), (f), and (g) until the manufacture is complete. Other embodiments are described and claimed.
摘要:
A Metal Oxide Semiconductor (MOS) transistor comprising: a source; a gate; and a drain, the source, gate and drain being located in or on a well structure of a first doping polarity located in or on a substrate; wherein at least one of the source and the drain comprises a first structure comprising: a first region forming a first drift region, the first region being of a second doping polarity opposite the first doping polarity; a second region of the second doping polarity in or on the first region, the second region being a well region and having a doping concentration which is higher than the doping concentration of the first region; and a third region of the second doping polarity in or on the second region. Due to the presence of the second region the transistor may have a lower ON resistance when compared with a similar transistor which does not have the second region. The breakdown voltage may be influenced only to a small extent.
摘要:
A system and method for a secure weapon concealment compartment situated in a personal carrying item such as a purse, handbag, briefcase, backpack or luggage that allows a person to safely and efficiently carry, store and make available for use a weapon. The concealment compartment includes weapon securing having tapered holders or orifices formed to receive a weapon and provide safety against unintentional discharge of the weapon and resistive forces applied to a protective carrier of the weapon once stored to enable quick and effective withdrawal of the weapon from the concealment compartment.
摘要:
The present invention relates to RNA interference-based methods for inhibiting the expression of the DUX4 gene, a double homeobox gene on human chromosome 4q35. Recombinant adeno-associated viruses of the invention deliver DNAs encoding microRNAs that knock down the expression of DUX4. The methods have application in the treatment of muscular dystrophies such as facioscapulohumeral muscular dystrophy.
摘要:
A system and process are disclosed for production of consolidated magnesium metal products and alloys with selected densities from magnesium-containing salts and feedstocks. The system and process employ a dialkyl magnesium compound that decomposes to produce the Mg metal product. Energy requirements and production costs are lower than for conventional processing.
摘要:
The present invention provides a method for preparing atosiban acetate. The method comprises the following steps of: synthesizing to obtain linear atosiban; dissolving the linear atosiban in an acetonitrile aqueous solution, adjusting the pH value with ammonia water, adding H2O2 for oxidizing, filtering, purifying, and transferring salt to obtain the atosiban acetate. In the present invention, an appropriate route is provided, the linear atosiban is synthesized by adopting a solid phase method, and the atosiban is obtained by liquid phase oxidation. The method has the advantages of capabilities of solving the problem of insolubility of the linear atosiban, reducing the reaction size to the maximum extent and shortening reaction time, and being high in yield and easy to industrialize.
摘要翻译:本发明提供了一种制备醋酸托西班醋酸酯的方法。 该方法包括以下步骤:合成得到线性阿托西班; 将线性阿托西班溶解在乙腈水溶液中,用氨水调节pH值,加入H 2 O 2进行氧化,过滤,纯化和转移盐,得到醋酸阿托品。 在本发明中,提供了适当的途径,通过采用固相法合成线性阿托西班,通过液相氧化获得阿托西班。 该方法具有解决线性阿托西班不溶性问题的能力,最大限度地减少反应尺寸,缩短反应时间,产率高,易于工业化的优点。
摘要:
A computing device may identify multiple search results that have relatively high correlation with the keyword. The device may determine multiple additional search results based on the corresponding relationships among the keyword, the multiple additional search results, and transaction parameters. The device may list the search results related to the degree of transaction success on the top and the search results related to the correlation on the bottom. The transactional parameters may be determined based on a click index and a purchase index that are associated with the keyword and each search result of the multiple additional search results. The click index and the purchase index may be generated in a predetermined time period.