Abstract:
A photovoltaic power conditioning system and method is provided. The system includes an isolated DC/DC converter (41), a DC/AC inverter (42), and a sine filter (43). The isolated DC/DC converter (41) receives a DC voltage from a solar cell through a parallel connection structure and converts the DC voltage into another DC voltage and then outputs the converted DC voltage through a series connection structure. The DC/AC inverter (42) converts the DC voltage output from the isolated DC/DC converter into an AC voltage. The sine filter (43) performs sine filtering on the AC voltage output from the DC/AC inverter and outputs the filtered AC voltage. The system employs a topology allowing it to be responsible for part of the output capacity, thereby significantly reducing the required capacity and increasing the system efficiency, so that the system can be applied to small and large-capacity photovoltaic power generation.
Abstract:
Disclosed is a method of recovering 1,3-butadiene from a C4 stream containing butane, isobutane, 2-butene, 1-butene, isobutene, butadiene and acetylene. The process of recovering highly pure 1,3-butadiene includes acetylene conversion for selectively converting acetylene through liquid-phase hydrogenation, so that the acetylene content is decreased to 70 wt ppm or less, and 1,3-butadiene extraction using an extractive distillation column, a pre-separator, a solvent stripping column, a solvent recovery column, and a purification column. Through the acetylene conversion, the concentration of vinylacetylene is decreased to 70 wt ppm or less, after which 1,3-butadiene is recovered using only one extractive distillation column, thereby considerably decreasing the degree of utility and the loss of streams in the course of extraction. The number of units necessary for the process is decreased, thus remarkably reducing the time during which impurities can accumulate in a processing unit.
Abstract:
An organic light emitting display which minimizes the IR drop of voltages supplied to an organic light emitting display panel includes an organic light emitting display panel having a pixel unit on which an image is displayed and first and second power source pads provided at two or more edges outside the pixel unit to receive first and second voltages from at least two directions, and a voltage supplier Flexible Printed Circuit Board (FPCB) including pads electrically coupled to the first and second power source pads and arranged on the outer circumference of the organic light emitting display so as not to overlap with the pixel unit.
Abstract:
This invention relates to a bismuth molybdate catalyst, a preparation method thereof, and a method of preparing 1,3-butadiene using the same, and to a bismuth molybdate catalyst, a preparation method thereof, and a method of preparing 1,3-butadiene using the same, in which 1,3-butadiene can be prepared through oxidative dehydrogenation directly using a C4 mixture including n-butene and n-butane as a reactant in the presence of a mixed-phase bismuth molybdate catalyst including α-bismuth molybdate (Bi2Mo3On) and γ-bismuth molybdate (Bi2MoO6). According to this invention, the C4 raffinate, containing many impurities, is used as a reactant, without an additional n-butane separation process, thus obtaining 1,3-butadiene at high yield. Unlike complicated multicomponent-based metal oxides, the catalyst of the invention has simple constituents and synthesis routes, and can be easily formed through physical mixing, and thus is very advantageous in assuring reproducibility and can be directly applied to commercial processes.
Abstract:
An inkjet print head and an inkjet image forming apparatus having the same includes photo sensors are mounted on the inkjet print head to sense whether or not nozzles normally discharge ink and to sense missing nozzles whenever the ink is printed on a recording paper, thereby rapidly and correctly sensing the missing nozzles.
Abstract:
The present invention relates to Lactobacillus strain with a body-fat reducing activity and provides Lactobacillus plantarum Strain PL62 KCCM-10655P. The strain of the invention can be directly used as body-fat reducing functional foods, or can be used as additives of body-fat reducing functional foods or a ferment starter strain of body-fat reducing functional fermented foods. Body-fat inhibiting materials that the strain of the present invention produce can be isolated to be used. In addition, in case that fermented foods are produced using the strain the invention provides conditions capable of having a maximal body-fat reducing effect.
Abstract:
A method of controlling recording of data with respect to each track of a once-writable optical disc, includes: detecting whether a shock error occurs during recording of track information; if the shock error is detected, stopping the recording of the track information and estimating a position where the recording of the track information has stopped; recording dummy data from a backward position behind the estimated position as much as a predetermined period of time, for a predetermined period of time; and defining an error track from a start position of a track to a position where the recording of the dummy data has ended.
Abstract:
A flat panel display (FPD) with a reduced time required to change images between frames by improving waveforms of a selection signal and a drive signal. The FPD includes an electrode, an electrophoretic device with charged particles arranged in response to a data signal, and a transistor device controlling transmission of the data signal. An image frame includes a drive section in which the data signal is transmitted to the electrophoretic device to arrange the charged particles and display a grayscale image, and the data signal has a first pulse with a first voltage magnitude and a second pulse with a second voltage magnitude. The frame also includes a shake section for removing an image generated in a previous frame, and the selection signal transmitted to the transistor device during the shake section has a constant predetermined voltage and switches the transistor device on.
Abstract:
A bias circuit for a smart power amplifier includes a high power mode bias circuit and a low power mode bias circuit, and operates only one of the bias circuits selectively using a switching circuit according to an input signal. Therefore, the bias circuit of high power mode and the bias circuit of the low power mode are divided and can be optimized according to characteristics of the power. Accordingly, a gain difference with respect to each power can be minimized and the low power mode can be controlled with a small amount of current in a state of initial current with a low power and in a middle power, such that an efficiency of the power amplifier can be improved at low power.
Abstract:
A synchronous dynamic random access memory capable of accessing data in a memory cell array therein in synchronism with a system clock from an external system such as a central processing unit (CPU). The synchronous DRAM receives an external clock and includes a plurality of memory banks each including a plurality of memory cells and operable in either an active cycle or a precharge cycle, a circuit for receiving a row address strobe signal and latching a logic level of the row address strobe signal in response to the clock, an address input circuit for receiving an externally generated address selecting one of the memory banks, and a circuit for receiving the latched logic level and the address from the address input circuit and for outputting an activation signal to the memory bank selected by the address and an inactivation signals to unselected memory banks when the latched logic level is a first logic level, so that the selected memory bank responsive to the activation signal operates in the active cycle while the unselected memory banks responsive to the inactivation signals operate in the precharge cycle.