The optimum conditions of supercritical fluid extraction(SFE) desorping the organic pollutants adsorbed and enriched by the adsorbent Porapak P and the effects of the conditions on the efficiencies ofSFE desorping o...The optimum conditions of supercritical fluid extraction(SFE) desorping the organic pollutants adsorbed and enriched by the adsorbent Porapak P and the effects of the conditions on the efficiencies ofSFE desorping organic pollutants are studied emphatically. Different kinds of organic adsorbents andmodifiers were tested. The recoveries of SFE are compared with Soxhlet extraction. The recoveries between93.1% and 109.3% are obtained for 25 kinds of compounds at 35 MPa, 100℃and 9.0ml SF-CO2, andtheir relative standard deviations (RSD) are in the range of 0.6-12.6 percent.展开更多
The temperature stress of reinforced concrete component caused by different linear expension coefficient has been discussed in this paper from the point of view of composite materials, The temperature dress can reach ...The temperature stress of reinforced concrete component caused by different linear expension coefficient has been discussed in this paper from the point of view of composite materials, The temperature dress can reach about 22 to 45 percent of the tension strength for the concrete with low grade and high ratio of reinforcement which should be considered seriously.展开更多
THE nucleus isthmi (NI) in lower vertebrates and its mammalian analogue, the nucleus para-bigeminalis, are all visual centres. They receive their tectal input ipsilaterally and project backipsilaterally in teleosts an...THE nucleus isthmi (NI) in lower vertebrates and its mammalian analogue, the nucleus para-bigeminalis, are all visual centres. They receive their tectal input ipsilaterally and project backipsilaterally in teleosts and birds, or bilaterally in amphibians and reptiles, as well as in mam-mals. It is well known that NI receives its visual excitation through the ipsilateral optic tec-tum (OT). NI mainly exerts inhibition on the ipsilateral OT in frogs.A recent study展开更多
THE retina in birds projects to the contralateral tectum. Our previous study and some otherphysiological, histochetnical and neurochemical evidence have suggested that the retino-tectal projection in birds might use g...THE retina in birds projects to the contralateral tectum. Our previous study and some otherphysiological, histochetnical and neurochemical evidence have suggested that the retino-tectal projection in birds might use glutamate as an excitatory transmitter. However, very lit-tle is known about its particular receptor type(s), because there are at least three major phar-macologically defined types of glutamate receptors: NMDA, AMPA/Kainate, andmetabotropic glutamate receptors.展开更多
文摘The optimum conditions of supercritical fluid extraction(SFE) desorping the organic pollutants adsorbed and enriched by the adsorbent Porapak P and the effects of the conditions on the efficiencies ofSFE desorping organic pollutants are studied emphatically. Different kinds of organic adsorbents andmodifiers were tested. The recoveries of SFE are compared with Soxhlet extraction. The recoveries between93.1% and 109.3% are obtained for 25 kinds of compounds at 35 MPa, 100℃and 9.0ml SF-CO2, andtheir relative standard deviations (RSD) are in the range of 0.6-12.6 percent.
文摘The temperature stress of reinforced concrete component caused by different linear expension coefficient has been discussed in this paper from the point of view of composite materials, The temperature dress can reach about 22 to 45 percent of the tension strength for the concrete with low grade and high ratio of reinforcement which should be considered seriously.
文摘THE nucleus isthmi (NI) in lower vertebrates and its mammalian analogue, the nucleus para-bigeminalis, are all visual centres. They receive their tectal input ipsilaterally and project backipsilaterally in teleosts and birds, or bilaterally in amphibians and reptiles, as well as in mam-mals. It is well known that NI receives its visual excitation through the ipsilateral optic tec-tum (OT). NI mainly exerts inhibition on the ipsilateral OT in frogs.A recent study
文摘THE retina in birds projects to the contralateral tectum. Our previous study and some otherphysiological, histochetnical and neurochemical evidence have suggested that the retino-tectal projection in birds might use glutamate as an excitatory transmitter. However, very lit-tle is known about its particular receptor type(s), because there are at least three major phar-macologically defined types of glutamate receptors: NMDA, AMPA/Kainate, andmetabotropic glutamate receptors.
