In this paper, the original process of vari-toned song in the Mmgming cicada is revealed, and the brand-new recognition for studies of the song mechanism in cicadas is opened up. Each vari-toned syllable 'Weiying&...In this paper, the original process of vari-toned song in the Mmgming cicada is revealed, and the brand-new recognition for studies of the song mechanism in cicadas is opened up. Each vari-toned syllable 'Weiying' is composed of 'Wei' with the basic sound (BS) as the dominant tone and 'ying' with the upper partials (UP2) as the dominant tone, and the upper partials (UP1) is a sound accompaniment of low intensity.The BS, UP1 and UP2 are produced by vibrations of the long ribs LR2,3 and LR1 in sounding membrane driven, separately, by two kinds of the twich in sounding muscle, 'Wei' and 'ying' are separately produced by the prin-subordinate vibrations of LR2,3 -LR1 and LR1-LR2,3. The LR1 and LR2,3 are analogous to a string tensioned two ends and a beam hinged two ends with a load in the middle respectively. Obtained the acoustic properties of sounding vibration are not only suited to the structural characteristics of LR1, 2, 3 but also consist basically with the acoustic properties of song.展开更多
Chinese textile companies might see Thursday--the first day of 2009--as the beginning of an unfettered era of free trade,but the outlook is clouded by weakening demand and rising protectionism amid the financial crisi...Chinese textile companies might see Thursday--the first day of 2009--as the beginning of an unfettered era of free trade,but the outlook is clouded by weakening demand and rising protectionism amid the financial crisis. Many textile companies cut exports to the lowest level in recent years.Some even failed to use up the quotas acquired before the third quarter.Shrinking orders in the fourth quarter and dim prospects for the year 2009 would mean a"tight"year for textile makers.This report contains information on the export status of original US quota-展开更多
文摘In this paper, the original process of vari-toned song in the Mmgming cicada is revealed, and the brand-new recognition for studies of the song mechanism in cicadas is opened up. Each vari-toned syllable 'Weiying' is composed of 'Wei' with the basic sound (BS) as the dominant tone and 'ying' with the upper partials (UP2) as the dominant tone, and the upper partials (UP1) is a sound accompaniment of low intensity.The BS, UP1 and UP2 are produced by vibrations of the long ribs LR2,3 and LR1 in sounding membrane driven, separately, by two kinds of the twich in sounding muscle, 'Wei' and 'ying' are separately produced by the prin-subordinate vibrations of LR2,3 -LR1 and LR1-LR2,3. The LR1 and LR2,3 are analogous to a string tensioned two ends and a beam hinged two ends with a load in the middle respectively. Obtained the acoustic properties of sounding vibration are not only suited to the structural characteristics of LR1, 2, 3 but also consist basically with the acoustic properties of song.
文摘Chinese textile companies might see Thursday--the first day of 2009--as the beginning of an unfettered era of free trade,but the outlook is clouded by weakening demand and rising protectionism amid the financial crisis. Many textile companies cut exports to the lowest level in recent years.Some even failed to use up the quotas acquired before the third quarter.Shrinking orders in the fourth quarter and dim prospects for the year 2009 would mean a"tight"year for textile makers.This report contains information on the export status of original US quota-
