A5065814318- Carbon Nanotubes in Composites
- Mass Spectrometry Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
- Mechanical and Optical Resonators
- Ion-surface interactions and analysis
- Radiation Effects in Electronics
- Analytical Chemistry and Sensors
- Advanced Sensor Technologies Research
- Heat Transfer and Optimization
- Heat transfer and supercritical fluids
- Diamond and Carbon-based Materials Research
- Graphene research and applications
- Advanced MEMS and NEMS Technologies
- Magnetic Field Sensors Techniques
- Phase Equilibria and Thermodynamics
- Heat Transfer Mechanisms
- Analytical chemistry methods development
- Microfluidic and Capillary Electrophoresis Applications
- Magnetic Bearings and Levitation Dynamics
- Electrochemical Analysis and Applications
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Analytical Chemistry and Chromatography
- Atomic and Molecular Physics
- Gas Sensing Nanomaterials and Sensors
- Characterization and Applications of Magnetic Nanoparticles
Institute of Physics
2015-2023
University of Chinese Academy of Sciences
2019-2023
Institute of Engineering Thermophysics
2019-2023
Chinese Academy of Sciences
2020-2023
Czech Academy of Sciences, Institute of Physics
2021
University of Bern
2019-2021
Wenzhou University
2015
Technical Institute of Physics and Chemistry
2015
Lanzhou Institute of Chemical Physics
2013
High vacuum measurements are required in space exploration, the semiconductor industry, and other fields; however, minimized gauge for high (< 0.1 Pa) measurement remains unsettled. Herein, we present a microelectromechanical system (MEMS)-based friction with large damping area small air gap gas ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1/{Q}_{\text {air}}{)}$ </tex-math></inline-formula>...
In this study, three ion-neutral collision models have been discussed and compared, including the Langevin, hard-sphere mixed models. With pseudo-potential approximation, analytical expressions of ion secular motions with obtained for first time. Through numerical simulations theoretical calculations, it is found that model could be used as a general description collisions under different conditions. Langevin good low energy between small ions neutrals, while to describe high and/or higher...
Carbon nanotubes (CNTs) as ideal electron emitters have been widely used in a variety of electronic devices, including the x-ray tube, vacuum microwave tubes, flat panel displays, microscopes, ionization gauges, etc. In this paper, we summarize current status research on gauges with CNT cathodes and discuss advantages well existing problems novel gauge. The emitter-based proved highly effective at ultra high extra measurements. This review also provides some suggestions to improve gauge...
A miniaturized ion trap mass spectrometer with continuous atmospheric pressure interface was built, which could be used in conjunction internal ionization (in-vacuum plasma ionization) and external (electrospray ionization). To improve its range, a supplemental AC signal frequency scan mode performed for this miniature spectrometer, the fundamental RF remained constant an amplitude as low several hundreds volts. Experiments showed that upper limit of range can extended to 2500 Da developed...
Titanium (Ti)-coated multiwall carbon nanotubes (CNTs) emitters based on the magnetron sputtering process are demonstrated, and influences of modification to CNTs residual gas adsorption, desorption, their field emission characteristic discussed. Experimental results show that Ti nanoparticles easily adsorbed surface due "defects" produced by Ar+ irradiation pretreatment. X-ray photoelectron spectroscopy (XPS) characterization showed contribute adsorption ambient molecules changing chemical...
Abstract Printed circuit heat exchanger could be used as pre-cooler in the supercritical carbon dioxide (S-CO 2 ) Brayton power cycle. Due to drastic variations of S-CO properties pre-cooler, segmental design method is investigate thermal-hydraulic performance PCHE. When duty given, local transfer entropy generation number has extreme value, which appears near intersection point capacity flow rates both sides. In addition, and total mainly depend on generation, imbalance increases especially...
Low energy ion measurements in the vicinity of a comet have provided us with important information about planet’s evolution. The calibration instruments for thermal ions laboratory plays crucial role when analysing data from in-situ space. A new low source based on carbon nanotube electron emitters was developed calibrating ion-mode mass spectrometers or other detectors. field emission (FE) properties nanotubes (CNTs) H2, He, Ar, O2, and CO2 gases were tested experiments. adsorbates could...
The significance of vacuum measurement technology is increasingly prominent in China’s thriving space industry. Lanzhou Institute Physics (LIP) has been dedicated to the development payloads and space-related for decades, widely participated programs. In this paper, we present several carried on satellites, spaceships, stations; methodologies which covered fields total partial pressure measurement, leak detection, standard gas inlet technology. Then, introduce corresponding calibration...
In this paper, a novel compact magnetic sector mass spectrometer has been developed and tested at the Lanzhou Institute of Physics. Its design is based on separation 90° sector-field analyzer with double trajectory, which induction 0.7 T. The instrument can record range from 1 to 50 amu two special trajectories when accelerating voltage ion source changes 200 V 2500 V. dimensions device together electronic unit are approximately 220 × 165 mm3 (length depth height). weight 10.2 kg maximum...
In this paper, a new calibration apparatus has been developed for calibrating quadrupole mass spectrometer (QMS) from 10−8 Pa to 10−2 He, N2 and Ar. Based on the apparatus, two methods are introduced generate standard pressure Pi' (or Pi'') of lower than Pa, which named as 'the SRG measurement method' CDG method'. The method can range 10−5 Pa. A molecular flow condition is determined QMS calibrated by using single gas mixture gas. through small tube orifice realizes at an upstream less 70...
As the most precise viscous vacuum gauge, spinning rotor gauge is widely used in aerospace, nuclear, semiconductor, and other fields because of its excellent accuracy chemical inertness. Herein, a metrological-grade developed, performance evaluated. It can be for international comparison standards construction national measurement traceability transmission systems. This paper presents design single-degree-of-freedom permanent magnet-biased suspension system, high-speed rotary stepper drive...
This work reports on the complete design and properties of an ionization gauge based a carbon nanotube cathode, which can measure ultrahigh vacuum without thermal effects. The is composed pressure sensor electronic controller. constructed hot-cathode gauge, where traditional hot filament replaced by electron source prepared with multi-wall nanotubes. Besides, controller was developed for bias voltage supply, low current detection, indication. calibrated in range 10-8 to 10-4 Pa XHV/UHV...