Submission Deadline
Volume 43 , Issue 01 | 10 Jun 2023
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Hour
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Publish On
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
Simulation of Effects of the Ion Initial State on the Resolution of Double Focusing Mass Spectrometer
A novel sub-miniature double-focusing sector-field mass spectrometer has been fabricated at the University of Minnesota using a combination of conventional machining methods and thin film patterning techniques typically used in the sensor technology industry. Its design is based on the mass separation capabilities of a 90° cylindrical crossed electric and magnetic sector-field analyzer with a 2-cm radius, which under proper conditions is able to effectively cancel the angular and chromatic dispersion of the ion beam, thus improving the resolving power of the instrument. Simulations using finite element analysis and computer modeling were employed to verify and optimize the performance of the proposed instrument before and during its fabrication. The prototype was able to attain a resolving power of 106 full-width at half-maximum (FWHM), a detection limit close to 10 parts per million, a dynamic range of 5 orders of magnitude and a mass range up to 103 Da. Its overall size, including the magnet assembly, is 3.5 cm wide, 6 cm long and 7.5 cm tall, it weighs 0.8 kg, and its power consumption was measured to be 2.5 W. The performance of the instrument was found to be comparable to that of commercial residual gas analyzers, at a fraction of the cost. All these characteristics make this miniature mass spectrometer suitable for portable and low-cost analytical instrumentation.
Performance of Combined Magnetic Fluid Seal and Spiral Seal for Sealing Water
When sealing liquids with magnetic fluid, the interfacial stability problem caused by the interaction between the magnetic fluid and the sealed liquid leads to poor sealing performance. Centrifugal force is generated by the rotation of the sealed liquid in the back blade seal, which forms back pressure to reduce the load of the seal or prevents the sealed liquid from leaking. To reduce the influence of the shaft speed on the sealing performance, a combined magnetic fluid and back blade seal was designed for sealing liquids and a combined seal experiment stand was set up. Theoretical and experimental studies were carried out. The results showed that under a higher shaft speed, the combined seal structure had better sealing performance in which the back blade seal played the main role; the magnetic fluid seal played a major role in stopping and lowering the speed to prevent seal leakage. The combined seal could run stably under different shaft speeds.
Ultra-High Range Ratio (>10000:1) Thermal Mass Flowmeter
In order to deeply understand the heat flow phenomenon, the geometry coefficient and the net mass flow reduction rate were introduced, and the pressure difference and net mass flow rate of 13 kinds of gases under the heat flow effect were studied. factor relationship. The results show that the net mass flow rate decays rapidly with the increase of the Knudsen number and the geometric coefficient, and both decrease by 99% when the Knudsen number reaches about 2.4 or the geometric coefficient reaches about 1000; The net mass flow rate is higher than that of the polar molecular gas, and the gas with a smaller viscosity index has a larger net mass flow rate; in the field of free molecular flow, the gas with a larger molecular mass or higher viscosity has a larger net mass flow rate. The pressure difference increases with the increase of the Knudsen number in the transitional flow domain, and reaches a maximum and remains constant when the flow state enters the free molecular flow domain, and is about 17.8% higher than the peak value in the transitional flow domain. When the temperature difference increases by 10 K, the net mass flow and pressure difference increase on average by about 18% and 15%, respectively, and in the transitional flow field, the greater the viscosity index of the gas, the greater the influence of the net mass flow by the temperature difference. Because the size of the microchannel is coupled with the gas flow state, the appropriate flow state and microchannel structure should be determined according to the specific requirements of pressure difference or flow rate. The main points to be considered in some applications of heat runaway effect are pointed out.
Analysis of Flow Rate and Pressure Characteristics for Multistage Thermal Transpiration Based Vacuum Pump
In order to deeply understand the heat flow phenomenon, the geometry coefficient and the net mass flow reduction rate were introduced, and the pressure difference and net mass flow rate of 13 kinds of gases under the heat flow effect were studied. factor relationship. The results show that the net mass flow rate decays rapidly with the increase of the Knudsen number and the geometric coefficient, and both decrease by 99% when the Knudsen number reaches about 2.4 or the geometric coefficient reaches about 1000; The net mass flow rate is higher than that of the polar molecular gas, and the gas with a smaller viscosity index has a larger net mass flow rate; in the field of free molecular flow, the gas with a larger molecular mass or higher viscosity has a larger net mass flow rate. The pressure difference increases with the increase of the Knudsen number in the transitional flow domain, and reaches a maximum and remains constant when the flow state enters the free molecular flow domain, and is about 17.8% higher than the peak value in the transitional flow domain. When the temperature difference increases by 10 K, the net mass flow and pressure difference increase on average by about 18% and 15%, respectively, and in the transitional flow field, the greater the viscosity index of the gas, the greater the influence of the net mass flow by the temperature difference. Because the size of the microchannel is coupled with the gas flow state, the appropriate flow state and microchannel structure should be determined according to the specific requirements of pressure difference or flow rate. The main points to be considered in some applications of heat runaway effect are pointed out.
Plasma Device for Precise Sterilization Based on Machine Vision
Herein, a plasma device with precise and controllable sterilization range was designed. It comprises three parts: mechanical motion, visual, and plasma parts. The mechanical motion part comprises a three degree of freedom motion platform and a camera module. The overall unit size is 408 mm × 356 mm × 300 mm, and the effective movement area is 100 mm × 100 mm × 45 mm. For the visual part, the OpenMV module, an onboard STM32f767vit6 chip, and an ov5640 sensor are used for programming. After shooting, the image is set to a gray image matrix of 180 × 180 pixels. The plasma device is a single electrode helium plasma, and the produced active substances such as H2O2 and NO3− decrease with increasing moving speed of the moving platform. Through machine learning and control, the device realizes the accurate scanning of closed graphics with an edge thickness greater than 0.5 mm and the accurate sterilization of graphics with different shapes and areas.
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