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制备了甘氨酸-壳聚糖复合膜修饰玻碳电极(Gly-CTS/GCE),研究了抗坏血酸(AA)和尿酸(UA)在该修饰电极上的电化学行为。结果表明在pH=5.59的磷酸盐缓冲溶液中,AA、UA在Gly-CTS/GCE上均产生灵敏的不可逆氧化峰,其峰电流与浓度在一定范围内呈良好的线性关系。对AA和UA混合溶液平行测定7次,相对标准偏差分别为4.6%、2.9%,表明该电极重现性和稳定性良好。AA、UA在Gly-CTS/GCE电极上的氧化峰峰电位相差340mV,据此可实现对二者的同时检测,并可应用于实际样品测定。 相似文献
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PAN-based fibers, heat-treated to ≈1300°C having elastic moduli ≈35 Msi (240 GPa), exhibit an unusual maximum in the resistivity at low temperature (≈30 K), and the temperature coefficient of resistance remains positive to 1.5 K. Measurement of resistivity are reported, and the results discussed in terms of models for the electronic states of this disordered material. It is speculated that the behavior is related to anomalies observed in the specific heat of bulk carbons heat treated to similar temperatures. 相似文献
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C70X2(X=H,F, Cl)的稳定性和电子光谱 总被引:1,自引:0,他引:1
用INDO方法研究C70H2四种异构体的稳定性, 表明其最稳定异构体为1, 9-C70H2和7, 8-C70H2, 两者能量差为16.3KJ.mol^-^1, 与实验值及ab initio计算值接近; 光谱计算表明, 其特征吸收峰与实验值一致。在此基础上预测C70F2和C70Cl2的稳定性和电子光谱, 表明C70F2四种异构体的稳定性顺序与C70H2一致, 而C70Cl2则以21, 42-异构体最为稳定。二者的电子光谱与C70H2极其相似只是在500nm以上有细微差别。 相似文献
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Demonstration of a high-speed nonscanning imaging spectrometer 总被引:1,自引:0,他引:1
Descour MR Volin CE Dereniak EL Thome KJ Schumacher AB Wilson DW Maker PD 《Optics letters》1997,22(16):1271-1273
We report results from a field demonstration of a nonscanning high-speed imaging spectrometer [computed-tomography imaging spectrometer (CTIS)] capable of simultaneously recording spatial and spectral information about a rapidly changing scene. High-speed spectral imaging was demonstrated by collection of spectral and spatial snapshots of a missile in flight. This instrument is based on computed-tomography concepts and operates in the visible spectrum (430-710nm). Raw image data were recorded at video frame rate (30frames / s) and an integration time of 2ms. An iterative reconstruction of the spatial and spectral scene information from each raw image took 10s. We present representative missile spectral signatures from the missile firing. The accuracy of the high-speed spectrometer is demonstrated by comparison of extended-source static-scene spectra acquired by a nonimaging reference spectrometer with spectra acquired by use of CTIS imaging of the same static scenes. 相似文献
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The dynamics of vitreous and molten zinc chloride have been studied with inelastic neutron scattering at the Intense Pulsed Neutron Source. The results are analyzed in terms of the scattering function, S(Q,E) and the effective vibrational density of states, G(E). The vibrational spectra of both glass and liquid are dominated by broad features centered at 15 and 35 meV which are identified with F2 modes ZnCl42− tetrahedra. The other two normal modes are note observed because of inadequate resolution and broadening and overlap resulting from coupling between tetrahedra. The behavior of ZnCl2 is contrasted with other tetrahedrally coordinated glasses that have been studied with the same technique. 相似文献
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