Article
Engineering, Mechanical
D. D. Tandel, Anindya Chatterjee, Atanu K. K. Mohanty
Summary: This paper studies the dynamics of a trapped ion in a mass spectrometer under the influence of quadrupolar RF and dipolar DC excitation. By calculating the electrostatic field for realistic geometries, we derive a classical Mathieu equation with a perturbation term and quadratic nonlinearity. We simplify the solution proposed by Plass, include the quadratic term, and develop a second-order averaging-based approximation. The results show that a stable periodic solution can be obtained using a two-frequency approximation, and we quantify the effect of the quadratic nonlinearity.
NONLINEAR DYNAMICS
(2023)
Article
Physics, Fluids & Plasmas
Ipshit Ghosh, Varun Saxena, Annangarachari Krishnamachari
Summary: Nonlinear phenomena inside a dual-frequency Paul trap were studied. The dynamics inside the trap can be described by a damped driven Duffing-type equation under the influence of external sinusoidal driving force, collisional damping, and even-order octopole field imperfection. The harmonic balance technique was used to analyze the dynamics around the primary resonance. It was found that the amplitude of the resonance curves, the inflection frequency at which the jump phenomena occurs, and the transitional frequencies depend on the voltage and frequency ratios of the dual-frequency Paul trap.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Engineering, Chemical
Vadim Rybin, Dmitrii Shcherbinin, Maxim Semynin, Anton Gavenchuk, Viktor Zakharov, Andrei Ivanov, Yuri Rozhdestvensky, Semyon Rudyi
Summary: In this paper, a nonlinear damping identification method is presented for the study of individual microparticles in a quadrupole electrodynamic Paul trap. The measurement procedure is discussed and the size, mass, and charge of silica microspheres are determined simultaneously and non-destructively. The experimental results agree well with independent microscopic examination and density reference values. Further development of the method is outlined.
Article
Engineering, Multidisciplinary
Xiang Fang, Jie Xie, Shiying Chu, You Jiang, Yuting An, Chang Li, Xiaoyun Gong, Rui Zhai, Zejian Huang, Chunling Qiu, Xinhua Dai
Summary: In this study, a quadrupole-linear ion trap (Q-LIT) tandem mass spectrometer was designed and built for the accurate and efficient measurement of small molecule disease markers. The developed method demonstrated high sensitivity and resolution, simplified the pre-treatment process, and showed potential for biomarker determination in clinical diagnosis and therapeutics.
Article
Mechanics
Qingyang Shao, Shuai Gao, Ziyuan Jiang, Qinkai Han, Fulei Chu
Summary: This study conducts an analysis of the output characteristics of pendulum type triboelectric nanogenerators (P-TENG) considering nonlinear electromechanical coupling effects. A mathematical model is proposed to accurately estimate the P-TENG performance. The results show that the proposed model can effectively improve the accuracy of P-TENG performance estimation and the influence of design parameters on system output characteristics is discussed.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Biochemical Research Methods
Anton Belousov, Morgan Miller, Robert Continetti, Stojan Madzunkov, Jurij Simcic, Dragan Nikolic, Frank Maiwald, Sarah Waller, Michael Malaska, Morgan Cable
Summary: The Enceladus plume is a target of astrobiological interest as it may carry signs of extraterrestrial life. To simulate fly-through conditions, researchers are developing an ice grain accelerator coupled with a mass spectrometer. Initial observations show brief increases in water molecule abundance during ice grain impacts.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2021)
Article
Mechanics
Vadim Rybin, Semyon Rudyi, Yuri Rozhdestvensky
Summary: The proposed method in this paper is a Nonlinear Damping Identification method for charged nano- and microparticles in a linear quadrupole Paul trap under nonlinear damping forces. The conditions for the formation of plane limit cycle trajectories are evaluated analytically and numerically, and numerical metrics for such orbits are introduced to define a functional relation between the metrics and physical parameters of a trapped particle.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Review
Astronomy & Astrophysics
J. Simcic, D. Nikolic, A. Belousov, D. Atkinson, C. Lee, S. Madzunkov, D. Almodiel
Summary: This paper introduces the types of mass spectrometers used for the study of solar system bodies' atmospheres, as well as the requirements for future small probe missions. Important composition measurements for ice giant atmospheres include helium, noble gases, and other key isotopes, with the inherent challenge of operating in the atmospheric layers of Neptune and Uranus. The QITMS developed by JPL is a compact and efficient mass spectrometer suitable for planetary exploration and surface sample research.
SPACE SCIENCE REVIEWS
(2021)
Article
Engineering, Aerospace
Andrea Petrocchi, George Barakos
Summary: In this work, the researchers demonstrate the application of the harmonic balance technique for transonic buffet cases. The method reduces computational costs compared to time-marching simulations and is used to estimate the oscillation frequency for unsteady flows. The aim is to improve predictions for buffet boundary estimation based on steady computations, which are still widely used in industry.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Steven W. Shaw, Sahar Rosenberg, Oriel Shoshani
Summary: Models for nonlinear vibrations often use polynomial terms to simulate nonlinear phenomena. The analysis of symmetric systems with cubic stiffness terms is common, and the inclusion of asymmetric quadratic terms is known to modify the effect of cubic nonlinearity in weakly nonlinear systems. However, in many cases, a monotonic dependence is not observed, requiring the use of techniques for strongly nonlinear systems or higher-order terms and perturbation methods.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Zeyuan Chang, Lei Hou, Rongzhou Lin, Yuhong Jin, Yushu Chen
Summary: This paper presents a modified incremental harmonic balance method to analyze the nonlinear dynamic and thermal coupling characteristics of rotor-bearing systems after thermal balance. The method efficiently calculates the residual vector and Jacobian matrix using tensor contraction and fast Fourier transform. The presented method achieves simultaneous and efficient calculation of the motion and heat balance equations in the frequency domain. It has shown greater computational efficiency, more accurate temperature prediction, and better recognition of nonlinear phenomena in the system compared to the step-by-step method.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mathematics, Applied
Rongzhou Lin, Lei Hou, Yi Chen, Yuhong Jin, N. A. Saeed, Yushu Chen
Summary: The paper presents a modified adaptive harmonic balance method with the asymptotic harmonic selection procedure. It improves the accuracy and efficiency of solving nonlinear vibration problems. Numerical experiments are conducted to verify its performance, and it is shown to outperform classical methods.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2023)
Article
Biochemical Research Methods
Abd-Allah A. El-Sheikh, Osama H. Elhamalawy, Sherif M. Taha, Fawzy I. Eissa
Summary: Accurate and highly sensitive analysis of folpet and captan was achieved using LC-QqQIT with a selective ion mode and optimized MS3 parameters. The developed method showed robustness and reliability through full validation, yielding recovery rates from 83 to 118% and LOQs ranging from 0.01 to 0.05 mg/kg in various food commodities. Monitoring results revealed the presence of captan residue in approximately 90% of apples and high concentrations of captan and folpet in sweet pepper. The novel MS3 method enables more reliable identification of these fungicides at lower LOQs compared to previous methods.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Chaohong Feng, Siyu Liu, Ting Jiang, Wei Xu
Summary: This article introduces a mass spectrometer based on a single mass analyzer that can achieve both quadrupole and ion trap operation modes. By designing and integrating a multi-electrode quadrupole-ion trap mass analyzer and two ionization sources, analysis of low-mass ions and high-mass ions with high sensitivity, mass resolution, and mass range can be achieved.
Article
Biochemical Research Methods
Samantha A. Mehnert, Joshua L. Fischer, Monica R. McDaniel, Kimberly C. Fabijanczuk, Scott A. McLuckey
Summary: In an electrodynamic ion trap, ions can be forced to higher frequency regions by applying a dipolar DC potential across opposing electrodes. This results in increased ripple motion and collisional activation, especially when a bath gas is present. The internal energy distribution of ions can be approximated by an effective temperature, and thermal activation parameters can be determined through dissociation kinetics. By subjecting the thermometer ion, protonated leucine enkephalin, to dipolar DC activation in different bath gases, and measuring T-eff as a function of DDC and RF voltages, a calibration and prediction model for T-eff can be established.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2023)
