A novel thermal biosensor based on enzyme reaction for pesticides detection has been developed. This biosensor is a flow injection analysis system and consists of two channels with enzyme reaction column and identical...A novel thermal biosensor based on enzyme reaction for pesticides detection has been developed. This biosensor is a flow injection analysis system and consists of two channels with enzyme reaction column and identical reference column, which is set for eliminating the unspecific heat. The enzyme reaction takes place in the enzyme reaction column at a constant temperature(40℃) realized by a thermoelectric thermostat. Thermosensor based on the thermoelectric module containing 127 serial BiTe-thermocouples is used to monitor the temperature difference between two effluents from enzyme reaction column and reference column. The ability of this biosensor to detect pesticides is demonstrated by the decreased degree of the hydrolytic heat in two types of thermosensor mode. The hydrolytic reaction is inhibited by 36% at 1 mg/L DDVP and 50 % at 10 mg/L DDVP when cell-typed thermosensor is used. The percent inhibition is 30% at 1 mg/L DDVP and 42% at 10 mg/L DDVP in tube-typed thermosensor mode. The detection for real sample shows that this biosensor can be used for detection of organophosphate pesticides residue.展开更多
This paper is mainly concerned with corank-2 and corank-3 symmetrybreaking bifurcation point in Z2×Z2-symmetric nonlinear problems. Regular extended systems are used to compute corank-2 and corank-3 symmetry--bre...This paper is mainly concerned with corank-2 and corank-3 symmetrybreaking bifurcation point in Z2×Z2-symmetric nonlinear problems. Regular extended systems are used to compute corank-2 and corank-3 symmetry--breaking bifurcation points. Two numerical examples are given. In addition, we show that there exist three quadratic pitchfork bifurcation point curves passing through corank-2 symmetry breaking bifurcation point.展开更多
Increasingly, test generation algorithms are being developed with the con-tinuous creations of incredibly sophisticated computing systems. Of all the developments of testable as well as reliable designs for computing ...Increasingly, test generation algorithms are being developed with the con-tinuous creations of incredibly sophisticated computing systems. Of all the developments of testable as well as reliable designs for computing systems, the test generation for sequential circuits is usually viewed as one of the hard nuts to be solved for its complexity and time-consuming issue. Although dozens of algorithms have been proposed to cope with this issue, it still remains much to be desired in solving such problems as to determine 1) which of the existing test generation algorithms could be the most efficientfor some particular circuits (by efficiency, we mean the Fault Coverage the algorithm offers, CPU time when executing, the number of test patterns to be applied, etc.) since different algorithms would be preferable for different circuits;2) which parameters (such as the number of gates, flip-flops and loops, etc.,in the circuit) will have the most or least influences on test generation so that the designers of circuits can have a global understanding during the stage of designing for testability.Testability forecasting methodology for the sequential circuits using regres-sion models is presented which a user usually needs for analyzing his own circuits and selecting the most suitable test generation algorithm from all possible al-gorithms available. Some examples and experiment results are also provided in order to show how helpful and practical the method is.展开更多
文摘A novel thermal biosensor based on enzyme reaction for pesticides detection has been developed. This biosensor is a flow injection analysis system and consists of two channels with enzyme reaction column and identical reference column, which is set for eliminating the unspecific heat. The enzyme reaction takes place in the enzyme reaction column at a constant temperature(40℃) realized by a thermoelectric thermostat. Thermosensor based on the thermoelectric module containing 127 serial BiTe-thermocouples is used to monitor the temperature difference between two effluents from enzyme reaction column and reference column. The ability of this biosensor to detect pesticides is demonstrated by the decreased degree of the hydrolytic heat in two types of thermosensor mode. The hydrolytic reaction is inhibited by 36% at 1 mg/L DDVP and 50 % at 10 mg/L DDVP when cell-typed thermosensor is used. The percent inhibition is 30% at 1 mg/L DDVP and 42% at 10 mg/L DDVP in tube-typed thermosensor mode. The detection for real sample shows that this biosensor can be used for detection of organophosphate pesticides residue.
文摘This paper is mainly concerned with corank-2 and corank-3 symmetrybreaking bifurcation point in Z2×Z2-symmetric nonlinear problems. Regular extended systems are used to compute corank-2 and corank-3 symmetry--breaking bifurcation points. Two numerical examples are given. In addition, we show that there exist three quadratic pitchfork bifurcation point curves passing through corank-2 symmetry breaking bifurcation point.
文摘Increasingly, test generation algorithms are being developed with the con-tinuous creations of incredibly sophisticated computing systems. Of all the developments of testable as well as reliable designs for computing systems, the test generation for sequential circuits is usually viewed as one of the hard nuts to be solved for its complexity and time-consuming issue. Although dozens of algorithms have been proposed to cope with this issue, it still remains much to be desired in solving such problems as to determine 1) which of the existing test generation algorithms could be the most efficientfor some particular circuits (by efficiency, we mean the Fault Coverage the algorithm offers, CPU time when executing, the number of test patterns to be applied, etc.) since different algorithms would be preferable for different circuits;2) which parameters (such as the number of gates, flip-flops and loops, etc.,in the circuit) will have the most or least influences on test generation so that the designers of circuits can have a global understanding during the stage of designing for testability.Testability forecasting methodology for the sequential circuits using regres-sion models is presented which a user usually needs for analyzing his own circuits and selecting the most suitable test generation algorithm from all possible al-gorithms available. Some examples and experiment results are also provided in order to show how helpful and practical the method is.
