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WenJie Wu,YanXuan Fan,Yan Zhang,QiaoDi Jia,Jie Cao 사단법인 한국질량분석학회 2015 Mass spectrometry letters Vol.6 No.1
This study demonstrated the stabilizing role of a cyclodextrin on Keggin [PW12O40]3- via hydrogen bonding complexationunveiled by ESI-MS. The distinctive fragmentation pathways of the {PW12}/γ-CD complexes from that of discrete[PW12O40]3- showed that the so-called “weak” non-covalent interactions can effectively change the dissociation chemistry ofPOM in the gas phase. The influence of different types of solvents and organic additives such as γ-CD on the stability of Keggin[PW12O40]3- was also addressed firstly by ESI-MS.
Improved Accelerometer and Magnetometer-Based Solution to Solve Quaternion
Feng Zhou,Yanxuan Wu,Ningjun Fan 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Light overloaded small aircraft, such as ducted fan MAV, could use accelerometer and magnetometer to measure acceleration and earth magnetic field in the body coordinate frame. There is a quaternion that relates the measured accelerations and earth magnetic field in the body coordinate frame to calculated values in the earth coordinate frame. An overdetermined nonlinear equations which could get the quaternion need to be solved. So far, the Gauss-Newton iteration algorithm was being used most commonly to solve the overdetermined equations. However, when the inverse of Jacobian matrix is singular or conditioned, the iteration would be diverge. To overcome the problem, first, transferring the overdetermined problem to determined one by a premultiply transposition of Jacobian matrix, then using Correctional Newton with Parameter iteration algorithm to solve the determined equations. Compared to Gauss-Newton iteration algorithm, this method not only could converge more fast, but also could overcome the situation which Jacobian matrix is singular or conditioned.