摘要:
In a process for quench-cooled, vapor-phase polymerization of olefin monomer comprising (a) contacting an olefin monomer, or mixture of olefin monomers, with a polymerization catalyst in the presence of hydrogen in a reactor vessel to form polymer product, and (b) removing, condensing and recycling off-gas from such reactor, an improvement comprises separating entrained polymerizing solid fines from said off-gas and recycling such solids directly to the reactor without substantial continued polymerization of such solids while in the presence of a substantially different concentration of hydrogen than in the reactor.
摘要:
Polyolefin polymer powder containing active catalyst residues is deactivated by contacting such powder with a mixture containing an inert gas and an ammonium salt in a dry state.
摘要:
Polyolefin polymer powder containing active catalyst residues is deactivated by (1) purging with an inert gas containing water vapor and (2) then contacting such powder with a gas mixture containing an inert gas, water vapor, and a third component selected from the group consisting of oxygen, carbon monoxide, carbon dioxide, C.sub.1 -C.sub.4 alcohols and C.sub.2 -C.sub.4 alkeneoxides.
摘要:
A thermal protection circuit to protect an electronic device from over-heat comprises a temperature sensor, a hysteresis comparator and a switch circuit. The temperature sensor senses internal temperature of the electronic device and output an internal temperature signal with voltage. The hysteresis comparator outputs a power-off signal when the voltage of the internal temperature signal is lower than a low voltage threshold representing an a determined temperature, or outputs a power-on signal when the voltage of the internal temperature signal is higher than a high voltage threshold representing a restarting temperature. The switch circuit stops transmitting power signals to the electronic device in response to the power-off signal, or continues to transmit the power signals to the electronic device in response to the power-on signal.
摘要:
A performance scaling device, a processor having the same, and a performance scaling method thereof are provided. The performance scaling device includes an adaptive voltage scaling unit, a latency prediction unit, and a variable-latency datapath. The adaptive voltage scaling unit generates a plurality of operation voltages and transmits the operation voltages to the variable-latency datapath. The variable-latency datapath operates with different latencies according to the operation voltages and generates an operation latency. The latency prediction unit receives the operation latency and a system latency tolerance and generates a voltage scaling signal for the adaptive voltage scaling unit according to the operation latency and the system latency tolerance. The adaptive voltage scaling unit outputs and scales the operation voltages thereof according to the voltage scaling signal.
摘要:
A transceiver front-end provides an interface between a transmission medium and transmitter, and between a transmission medium and receiver. The transceiver front-end includes a hybrid circuit, a high-pass filter, and a gain stage, that permits the reduction or the complete elimination of buffer amplifiers. Buffer amplifiers can be eliminated because the hybrid circuit and/or the high-pass filter are adapted so that they can be directly connected to each other, without a loss in circuit performance. Furthermore, the high-pass filter and/or the gain stage are also adapted so they can be directly connected. As such, the transceiver front-end can be constructed using all passive components, reducing or eliminating excess heat generation.
摘要:
The present invention provides a device for trapping or stretching a microscopic substance comprising (a) a light source; (b) an acousto-optic modulator (AOM); (c)a beam-expander; (d) an object lens; and (e) an incoherent light source. The present invention further provides a method for trapping or stretching a microscopic substance comprising (a) providing a focused laser beam to form a focal spot and (b) scanning a plurality of points on said microscopic substance by said focal spot by way of the AOM.
摘要:
A gas mixing apparatus including a chamber, a filter, a gas transmitting unit and a porous layer is provided. The chamber includes a gas inlet and a gas outlet. The filter, which has at least one opening, is disposed at the gas outlet of the chamber. An environmental gas outside the chamber is filtered and becomes a clean gas after flowing through the filter into the chamber. The gas transmitting unit is connected to the opening of the filter to transmit a gas to be mixed into the chamber through the opening. The porous layer is disposed at the gas outlet. The gas to be mixed is mixed with the clean gas and leaves the chamber through the porous layer.
摘要:
Binary indications are converted to an analog representation with significant reduction in ringing at the transitions between successive binary indications and in the period during each binary indication. The binary indications are disposed in a row-and-column matrix to provide a thermometer code. Each stage of the converter includes a decoder and latch arranged so the decoder inputs settle before the latch is set by the clock pulses. The stages are implemented in complementary CMOS. Complementary transistors are biased so one transistor of the pair is driven to the rail while the other transistor of the pair floats. A dummy CMOS transistor is used to balance the number of transistors in the decoder paths.