Submission Deadline
Volume 43 , Issue 01 | 10 Jun 2023
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Volume 43 , Issue 01 | 30 Jun 2023
Scopus Indexed(2023)
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology (ISSN:0253-9748) and (E-ISSN:1672-7126) is a scopus indexed journal since 1996. The journal is published by Zhongguo Zhenkong Xuehul.
The main scope of the journal is Materials Science: Surfaces, Coatings and Films ,Metals and Alloys,Materials Chemistry,Electronic, Optical and Magnetic Materials,Condensed Matter Physics and all sort of Engineering subjects. The journal welcomes all kind of original paper around the world.
Azerbaijan Medical Journal
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering)
Zhonghua yi shi za zhi (Beijing, China : 1980)
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science)
Tobacco Science and Technology
Teikyo Medical Journal
Agricultural Mechanization in Asia, Africa and Latin America
International Medical Journal
Technology Reports of Kansai University
Asia Life Sciences
Open Access Journals
Tagliche Praxis
Tobacco Science and Technology
Changjiang Liuyu Ziyuan Yu Huanjing/Resources and Environment in the Yangtze Valley
Bulletin of National Institute of Health Sciences
Journal of the Austrian Society of Agricultural Economics
Azerbaijan Medical Journal
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology
Aim and Scopes
-> Materials Science:
-> Earth Science
-> Physics
-> Astronomy
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology
Numerical Simulation of Internal Flow Field Distribution of Water Ring Vacuum Pump and Its Parameter Optimization
The two self-designed of centrifugal pump with small vane and centrifugal pump without small vane were simulated numerically to select a centrifugal pump with higher efficiency. The internal flow characteristics of the centrifugal pump was simulated by using Reynolds time-averaged N-S equation and RNG turbulence model to obtain pressure and velocity distribution and the cavitation characteristics were simulated by using SST turbulence model and Schnerr-Sauer cavitation model to obtain the gas volume fraction distribution. The results show that at the same flow rate, the change of velocity in the pump cavity of centrifugal pump with vane is smoother and the gas volume is less, but the back-flow is aggravated near the small vane, especially when interacting with the tongue, and a large amount of gas is generated at the suction surface of the small vane. In addition, the efficiency of centrifugal pump without vane is higher than that of centrifugal pump with vane, which provides a basis for the structural optimization of centrifugal pump.
Adsorption and Diffusion Properties of Gas in Carbon Nanotubes Based on Molecular Simulation
Biomethane route has large potential in emission reduction and energy saving. One of the key issues is separation of biogas in operating conditions of 333 K and 1 bar. Grand canonical Monte Carlo (GCMC) and equilibrium molecular dynamics simulations (EMD) were us ed to compute adsorption loadings and self-diffusivities of CH 4 /CO 2 at various diameters of carbon nanotube (CNT) bundles. Single component and equimolar gases were simulated. CO 2 always had larger adsorption loading and diffusion coefficient than CH 4 as the result of relatively strong interaction between CO 2molecules and tube walls, due to the confined capacity. The permselectivity reached a maximum in closely 1 nm, and under such conditions the separation process was controlled by adsorption rather than diffusion.
Analysis for Leakage Mechanism of a Cold Gas Thruster and its Improvement
Adelis-SAMSON is a nano-satellite mission aimed at performing geo-location of target signals on Earth using a tight three-satellite formation in space. To maintain formation, each nano-satellite is equipped with a cold gas propulsion system. The design, qualification, and integration of the Adelis-SAMSON nano-satellite propulsion system is presented in this paper. The cold gas propulsion system mass is approximately 2 kg, takes a volume of 2U, and generates a thrust of 80 mN from four thrusters using krypton as a propellant. We first present the propulsion system requirements and corresponding system configuration conceived to meet the mission requirements. Subsequently, we present the system architecture while listing all the components. We overview the particular role and qualification process of four of the propulsion system’s components: the propellant tank, thruster assembly, pressure regulators, and fill and vent valve. We detail the tests performed on each component, such as proof pressure tests, vibration tests, and external leak tests. Finally, we present the propulsion system level tests before delivery for satellite integration and discuss the propulsion system’s concept of operations.
Influence of Packed Material on Corona Discharge Characteristics
PLA (polylactic acid) is one of the three major biopolymers available on the market for food packaging, which is both bio-based and biodegradable. However, its performance as a barrier to gases remains too weak to be used for most types of food, particularly oxygen-sensitive foods. A surface treatment, such as coating, is a potential route for improving the barrier properties and/or providing bioactive properties such as antioxidants. Gelatin-based coating is a biodegradable and food-contact-friendly solution for improving PLA properties. The initial adhesion of gelatin to the film is successful, both over time and during production, however, the coating often delaminates. Corona processing (cold air plasma) is a new tool that requires low energy and no solvents or chemicals. It has been recently applied to the food industry to modify surface properties and has the potential to significantly improve gelatin crosslinking. The effect of this process on the functional properties of the coating, and the integrity of the incorporated active compounds were investigated. Two coatings have been studied, a control fish gelatin-glycerol, and an active one containing gallic acid (GA) as a natural antioxidant. Three powers of the corona process were applied on wet coatings. In the test conditions, there were no improvements in the gelatin crosslinking, but the corona did not cause any structural changes. However, when the corona and gallic acid were combined, the oxygen permeability was significantly reduced, while free radical scavenging, reduction, and chelating properties remained unaffected or slightly improved.
Modeling and Analysis for the Leakage Process in Dry Screw Vacuum Pumps
This paper modeled the dynamic characteristics of dry screw vacuum pumps considering the forces induced by gas, gear, bearings, and rotor gravity, and discussed the load on bearings and gear comprehensively employing the proposed model. First, the balance equations on force and torque were proposed based on a simplified force analysis model for a test dry screw vacuum pump. Next, the detailed calculation methods of gas force, gear load, bearing load, and motor power were presented, respectively. Furthermore, the calculated motor power was verified by comparing the measured results from a test experiment. Finally, the gas force, gear load, bearing load, and bearing power loss under different inlet pressures was discussed comprehensively. Results showed that the proposed model could effectively analyze the load and power distribution for dry screw vacuum pumps. The torque of synchronous gear could be reduced by reasonably selecting the driving shaft. The axial gas force acting on the end face of rotors showed the main contribution for the power loss of bearings, which accounted for up to 3.2% of total input power. The obtained conclusions could guide the reasonable design and selection of the supporting and driving components for dry screw vacuum pumps.
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