Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/thre...Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/three electrodes system；direct/derivative output；normal/differential mode. Consequently they can be combined into several working manners, result in different experimental methods as consistent with desire. This instrument has manifold compensator and adjuster with a wide-range, so that the sensitivity and the signal graph have been able to improve. In addition, the instrument incorporates a strip-chart recorder and an exact timer. It is also equipped with electrochemical bench and a set of electrodes including the rotating glassy carbon electrode, gold plate electrode, silver plate electrode, mercury coated silver base electrode, hanging mercury electrode etc. In order to broaden the field of its application, all units of the instrument can be unitized, but each and every can be also used independently. The instrument is applicable to polarography, voltammetry, potentiometric stripping, potentiostatic electrolysis,differential technique, coulometry, linear polarization method, cycle voltammetry, passivation curve, and some other electrochemical technique, which have need for electrochemical cell with two, three，or four electrodes. This paper describes the design fundament, feature and specification of the electrochemical analyzer, and finally gives laboratory application some experimental examples.展开更多
In the DF1-1 Gas Field in the Yinggehai Basin, South China Sea, the velocity-depth plot and velocity spectra show significant variations from a linear trend, exhibiting a distinct reversal phenomenon. Velocity paramet...In the DF1-1 Gas Field in the Yinggehai Basin, South China Sea, the velocity-depth plot and velocity spectra show significant variations from a linear trend, exhibiting a distinct reversal phenomenon. Velocity parameters derived from velocity spectral analysis of the seismic data and sonic logs indicate that the interval velocity reverses below 2,100 m (2.2 s two-way time (TWT)) in the DF1-1 Gas Field. Some direct hydrocarbon indicators (DHIs) models developed for the shallow strata cannot be simply applied to the moderately to deeply buried strata for direct exploration target recognition because the velocity reversal has caused the middle-deep gas reservoirs to exhibit a moderate or weak seismic amplitude. The hydrocarbon indicator method of “Differential Interformational Velocity Analysis (DIVA)” with the aid of other hydrocarbon indicating techniques was employed to effectively identify DHIs in the middle-deep strata under velocity inversion. The result has shown that the DIVA technique can be effectively used as a DHI in both the shallow and the middle-deep strata in the study area with the shallow strata characterized by Type I DIVA anomaly and the middle-deep strata characterized by the Type II DIVA anomaly.展开更多
Background A model of simulated Alzheimer＇s disease （AD） induced by aggregated amyloid protein （Aβ1-40） was built in Wister rats to observe the behavioral and pathological changes of Aβ1-40 and the effect of hy...Background A model of simulated Alzheimer＇s disease （AD） induced by aggregated amyloid protein （Aβ1-40） was built in Wister rats to observe the behavioral and pathological changes of Aβ1-40 and the effect of hypodermic insulin injected on the function of study and memory and the expression of Aβ1-40 from the CA1 area of the hippocampus. Methods Experimental groups were as follows： contrast, simulated AD model, contrast of Nacl, and insulin treated. The simulated AD model was built by microinjection of aggregated Aβ1-40 at the CA1 area of the hippocampus, and was hypodermically injected with 0.9% NaCI （1 ml/kg） and insulin （0.1 U/kg） separately the next day. Two weeks after the modeling, the four groups were tested with water maze about the study and memory function of rats. Three weeks after the injection, the expression of Aβ1-40 at the CA1 area of the hippocampus was examined by pathological tests （HE, Congo red） and immunohistochemical methods. Results The study and memory abilities of rats were ameliorated significantly by the place navigation test and the spatial probe test after the application of insulin. Insulin could decrease the expression of Aβ1-40 at the CA1 area of the hippocampus to reduce the pathological damage of Aβ1-40 to the hippocampal area of rats. Conclusions The injection of aggregated Aβ1-40 to the hippocampal area could simulate the behavioral and pathological features of AD such as the difficulty of study and memory and the damage to neurons. Insulin is effective to improve the function of study and memory and amend the pathological damage of simulated AD model rats. The results give a experimental proof of insulin in the clinical treatment of AD.展开更多
One of the most promising near-term applications of high T_c superconductingfilms is in the area of passive microwave devices. The most remarkable feature ofthese microwave devices is that the high-frequency surface r...One of the most promising near-term applications of high T_c superconductingfilms is in the area of passive microwave devices. The most remarkable feature ofthese microwave devices is that the high-frequency surface resistance ofsuperconducting films is smaller than that of metal thin films. The size of themicrowave devices is dictated by wavelength and the thin films are generally requiredto be not smaller than a few square centimeters. Though pulsed laser deposition展开更多
文摘Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/three electrodes system；direct/derivative output；normal/differential mode. Consequently they can be combined into several working manners, result in different experimental methods as consistent with desire. This instrument has manifold compensator and adjuster with a wide-range, so that the sensitivity and the signal graph have been able to improve. In addition, the instrument incorporates a strip-chart recorder and an exact timer. It is also equipped with electrochemical bench and a set of electrodes including the rotating glassy carbon electrode, gold plate electrode, silver plate electrode, mercury coated silver base electrode, hanging mercury electrode etc. In order to broaden the field of its application, all units of the instrument can be unitized, but each and every can be also used independently. The instrument is applicable to polarography, voltammetry, potentiometric stripping, potentiostatic electrolysis,differential technique, coulometry, linear polarization method, cycle voltammetry, passivation curve, and some other electrochemical technique, which have need for electrochemical cell with two, three，or four electrodes. This paper describes the design fundament, feature and specification of the electrochemical analyzer, and finally gives laboratory application some experimental examples.
基金supported by the National Natural Science Foundation of China (No.40702024)the Project was sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education of China (No.2009022014)Open Research Foundation of Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences),Ministry of Education (No.TPR-2009-33)
文摘In the DF1-1 Gas Field in the Yinggehai Basin, South China Sea, the velocity-depth plot and velocity spectra show significant variations from a linear trend, exhibiting a distinct reversal phenomenon. Velocity parameters derived from velocity spectral analysis of the seismic data and sonic logs indicate that the interval velocity reverses below 2,100 m (2.2 s two-way time (TWT)) in the DF1-1 Gas Field. Some direct hydrocarbon indicators (DHIs) models developed for the shallow strata cannot be simply applied to the moderately to deeply buried strata for direct exploration target recognition because the velocity reversal has caused the middle-deep gas reservoirs to exhibit a moderate or weak seismic amplitude. The hydrocarbon indicator method of “Differential Interformational Velocity Analysis (DIVA)” with the aid of other hydrocarbon indicating techniques was employed to effectively identify DHIs in the middle-deep strata under velocity inversion. The result has shown that the DIVA technique can be effectively used as a DHI in both the shallow and the middle-deep strata in the study area with the shallow strata characterized by Type I DIVA anomaly and the middle-deep strata characterized by the Type II DIVA anomaly.
基金This research was supported by a grant from the Natural Science Foundation of Heilongjiang Province, China （No： ZJY0706）.
文摘Background A model of simulated Alzheimer＇s disease （AD） induced by aggregated amyloid protein （Aβ1-40） was built in Wister rats to observe the behavioral and pathological changes of Aβ1-40 and the effect of hypodermic insulin injected on the function of study and memory and the expression of Aβ1-40 from the CA1 area of the hippocampus. Methods Experimental groups were as follows： contrast, simulated AD model, contrast of Nacl, and insulin treated. The simulated AD model was built by microinjection of aggregated Aβ1-40 at the CA1 area of the hippocampus, and was hypodermically injected with 0.9% NaCI （1 ml/kg） and insulin （0.1 U/kg） separately the next day. Two weeks after the modeling, the four groups were tested with water maze about the study and memory function of rats. Three weeks after the injection, the expression of Aβ1-40 at the CA1 area of the hippocampus was examined by pathological tests （HE, Congo red） and immunohistochemical methods. Results The study and memory abilities of rats were ameliorated significantly by the place navigation test and the spatial probe test after the application of insulin. Insulin could decrease the expression of Aβ1-40 at the CA1 area of the hippocampus to reduce the pathological damage of Aβ1-40 to the hippocampal area of rats. Conclusions The injection of aggregated Aβ1-40 to the hippocampal area could simulate the behavioral and pathological features of AD such as the difficulty of study and memory and the damage to neurons. Insulin is effective to improve the function of study and memory and amend the pathological damage of simulated AD model rats. The results give a experimental proof of insulin in the clinical treatment of AD.
文摘One of the most promising near-term applications of high T_c superconductingfilms is in the area of passive microwave devices. The most remarkable feature ofthese microwave devices is that the high-frequency surface resistance ofsuperconducting films is smaller than that of metal thin films. The size of themicrowave devices is dictated by wavelength and the thin films are generally requiredto be not smaller than a few square centimeters. Though pulsed laser deposition
