Measurement of the remnant magnetic-field in Lorentz mode using permalloy

A novel method was reported to measure the remnant magnetic field in Lorentz mode in a FEI Tecnai F20 transmission electron microscope equipped with a Lorentz lens.The movement of the circle Bloch line of the cross-tie wall in Permalloy is used to measure the remnant magnetic field by tilting the specimen and adjusting the objective lens current.The remnant magnetic field is estimated to be about 17 Oe,in a direction opposite to that of the objective lens magnetic field.The remnant magnetic field can be compensated by adjusting the value of the objective lens current.

An improved artificial bee colony algorithm with MaxTF heuristic rule for two-sided assembly line balancing problem

Two-sided assembly line is usually used for the assembly of large products such as cars,buses,and trucks.With the development of technical progress,the assembly line needs to be reconfigured and the cycle time of the line should be optimized to satisfy the new assembly process.Two-sided assembly line balancing with the objective of minimizing the cycle time is called TALBP-2.This paper proposes an improved artificial bee colony(IABC)algorithm with the MaxTF heuristic rule.In the heuristic initialization process,the MaxTF rule defines a new task's priority weight.On the basis of priority weight,the assignment of tasks is reasonable and the quality of an initial solution is high.In the IABC algorithm,two neighborhood strategies are embedded to balance the exploitation and exploration abilities of the algorithm.The employed bees and onlooker bees produce neighboring solutions in different promising regions to accelerate the convergence rate.Furthermore,a well-designed random strategy of scout bees is developed to escape local optima.The experimental results demonstrate that the proposed MaxTF rule performs better than other heuristic rules,as it can find the best solution for all the 10 test cases.A comparison of the IABC algorithm and other algorithms proves the effectiveness of the proposed IABC algorithm.The results also denote that the IABC algorithm is efficient and stable in minimizing the cycle time for the TALBP-2,and it can find 20 new best solutions among 25 large-sized problem cases.

Rapid Screening of Nine Illicit Drugs in Human Blood and Urine by Direct Analysis in Real‑Time Mass Spectrometry

We aimed to establish for the rapid detection of morphine,O6‑monoacetylmorphine,heroin,codeine,cocaine,methamphetamine,ketamine,methadone,and dolantin in human blood and urine by direct analysis in real‑time coupled with tandem mass spectrometry(DART‑MS/MS).These samples were extracted by acetonitrile‑methanol(V/V=4:1),using DART 12 Dip‑it automatic sampling system.They were injected at 400℃,and analyzed by positive ion and multiple reaction monitoring mode.The detection limits of morphine,O6‑Monoacetylmorphine,heroin,codeine,cocaine,methamphetamine,ketamine,methadone,and dolantin were 100,50,50,100,20,20,10,1,and 0.01 ng/mL,respectively.The practical cases contained methamphetamine,codeine,cocaine,and O6‑monoacetylmorphine were detected accurately and rapidly.The method has the advantages of high sensitivity and good accuracy.The sample processing is simple and can be analyzed in a short time.This method is suitable for the analysis of morphine,O6‑monoacetylmorphine,heroin,codeine,cocaine,methamphetamine,ketamine,methadone,and dolantin in some practical cases.