摘要:
Provided is a hydrogenated block copolymer for preparing a foam excellent in tear strength, compression set resistance, low impact resilience, and abrasion resistance.More specifically, provided is a hydrogenated block copolymer comprising a vinyl aromatic compound and a conjugated diene, wherein: (a) the vinyl aromatic unit content is greater than 35 wt. % and not greater than 90 wt. %, (b) the vinyl aromatic polymer block content is not greater than 40 wt. %, (c) the weight average molecular weight is from 5×104 to 100×104, and (d) the hydrogenation ratio of double bonds derived from the conjugated diene is less than 70%.
摘要:
A polymer foam having a specific gravity of from 0.05 to 0.5 and comprising a plurality of cells defined by cell walls which constitute a polymer matrix, wherein the polymer matrix is comprised of 5 to 100 parts by weight of (A) a hydrogenated copolymer obtained by hydrogenating an unhydrogenated copolymer which contains at least one copolymer block S comprised of vinyl aromatic monomer units and conjugated diene monomer units, and 95 to 0 part by weight of (B) at least one polymer selected from the group consisting of an olefin polymer and a rubbery polymer, and wherein at least one peak of loss tangent (tanδ) is observed at −40° C. to lower than −10° C. in a dynamic viscoelastic spectrum obtained with respect to the hydrogenated copolymer (A).
摘要:
A computer system includes a system unit; a communication unit which performs a wireless network communication with a base station; and a controller that controls the communication unit to transmit a communication ending message if a shutdown event of the system unit occurs, and shuts down the system unit after the completion of the transmission of the message.
摘要:
A digital audio encoder that enables the digital signal processing of a stereo audio signal and multiplexed voice data by extending a two-channel digital audio system of comparatively simple construction. Stereo audio data and multiplexed voice data are sampled and scaled for adjusting the range of the signals. Thereafter, a window is applied to the data. With the window, adjacent blocks are overlapped in order to eliminate noise between the blocks. MDCT and MDST functions are performed using the same size window for extracting and normalizing MDCT and MDST coefficients which respectively indicate an exponent and a mantissa. The mantissa consists of fixed bit data and variable bit data. In order to determine the fixed bit data, fixed bit data are allocated on a sub-band basis. In order to determine the variable bit data, each of the remaining bits are allocated on a sub-band basis from the lowest frequency band. Thereafter, quantization is performed. If multiplexed voice data is not present, 512 pieces of data are processed in each frame. If multiplexed voice data is present, 1024 pieces of data are processed in each frame.