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Pattern reconfigurable antenna array for 5.8 GHz WBAN applications
杨凌升,王斌,李雅洁
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 9, Pages 1357-1365 doi: 10.1631/FITEE.2200542
The Characterization System of the Ballistic Performance of Armor Magnesium Alloys
Cai Hongnian,Tan Chengwen,Wang Fuchi,Chen Zhiyong
Strategic Study of CAE 2006, Volume 8, Issue 2, Pages 30-33
The absorbed energy property and deformation characteristic of magnesium alloy under high strain rate loading are described. Then the basic science problem connected with materials' ballistic performance closely such as dynamic strength, absorbed energy rate, adiabatic shear deformation localization and dynamic hardness are discussed primarily. The purpose of the paper is that promoting the basic and application research of armor magnesium alloys.
Keywords： absorbed energy rate adiabatic shear deformation localization dynamic strength dynamic hardness
Jiayao Zhang, Dongdong Gu, Ying Yang, Hongmei Zhang, Hongyu Chen, Donghuai Dai, Kaijie Lin
Engineering 2019, Volume 5, Issue 4, Pages 736-745 doi: 10.1016/j.eng.2019.07.003
A three-dimensional laser absorption model based on ray tracing was established to describe the coupled interaction of a laser beam with particles in the powder layers of pure tungsten (W) material processed by selective laser melting (SLM). The influence of particle size on the powder-to-laser absorptivity and underlying absorption behavior was investigated. An intrinsic relationship between the absorption, distribution of absorbed irradiance within the powder layers, and surface morphology and geometric characteristics (e.g., contact angle, width and height of tracks, and remelted depth) of the laser scanning tracks is presented here. Simulation conclusions indicate that the absorptivity of the powder layers considerably exceeds the single powder particle value or the dense solid material value. With an increase in particle size, the powder layer absorbs less laser energy. The maximum absorptivity of the W powder layers reached 0.6030 at the particle size of 5 μm. The distribution of laser irradiance on the particle surface was sensitive to particle size, azimuthal angle, and the position of the powder particles on the substrate. The maximum irradiance in the powder layers decreased from 1.117×10–3 to 0.85×10–3 W·μm–2 and the contour of the irradiance distribution in the center of the irradiated area gradually contracted when the particle size increased from 5 to 45 μm. An experimental study on the surface morphologies and cross-sectional geometric characteristics of SLM-fabricated W material was performed, and the experimental results validated the mechanisms of the powder-to-laser-absorption behavior that were obtained in simulations. This work provides a scientific basis for the application of the ray-tracing model to predict the wetting and spreading ability of melted tracks during SLM additive manufacturing in order to yield a sound laser processability.
Keywords： Selective laser melting (SLM) Tungsten Ray-tracing model Absorptivity Laser scanning tracks
Hydraulic Pressure Extremes Ratio & Extremes Ratio Efficiencies
Qi Maolin
Strategic Study of CAE 2001, Volume 3, Issue 4, Pages 73-75
This article applies basic formula to the calculation of a relationship between the hydraulic pressure extremes ratio of hydraulic system and the extremes ratio efficiencies. This relationship shows that the greater the hydraulic pressure extremes ratio is, the lower the extremes ratio efficiencies are. The article holds that the hydraulic pressure extremes ratio can be designed and chosen.
Keywords： hydraulic pressure extremes ratio extremes ratio efficiencies hydraulic system
The progress of membrane adsorption and absorption
Lin Ligang,Ye Hui,Zhao Lizhi,Ding Xiaoli,Zhang Yuzhong
Strategic Study of CAE 2014, Volume 16, Issue 12, Pages 59-66
During recent years， membrane integration process has attracted wide attentions. The study on combination of the traditional separation technology and membrane process is conducive to the advantages such as high efficiency， easy online， etc. It is significant for the large-scale application of membrane integration process with low cost. Membrane adsorption and membrane absorption processes， which combined the advantages of membranes with adsorption， gained wide?applications for numerous occasions such as purification and separation. The research advances and development tendency of membrane adsorption and absorption will be introduced in this article， which can provide some suggestions for the researchers of related fields.
Keywords： membrane membrane adsorption membrane absorption
Scheme comparison of Qiongzhou strait railway tunnel
Tan Zhongsheng,Wang Mengshu,Luo Shixiang
Strategic Study of CAE 2009, Volume 11, Issue 7, Pages 39-44
The construction of the Qiongzhou strait tunnel will not only meet the requirements of the straits' passenger and cargo traffic,but also the needs of national defense, and the constructed tunnel will play a huge pulling role in Hainan´s economic development.Comparing with the similar projects abroad, the preliminary work of Qiongzhou strait tunnel was very urgent and needed a long time, because of enormous workload of research, complex technology and difficulties. Based on the study of meteorological, hydrological, geological data and other information of Qiongzhou strait tunnel, the bridge and tunnel schemes are simply compared, which indicate that the tunnel scheme is suitable, moreover, the shield tunnel scheme for line Ⅱ is better than others. After compared the shallow tunnel with deep tunnel schemes of line Ⅱ, the shallow tunnel using shield method scheme is proposed. As highway tunnel had many technical problems, and project costs and operating costs are very high, therefore, the railway tunnel plan as the preferred option is feasible, and cars could pass through the tunnel by shuttle trains.
Keywords： Qiongzhou strait railway tunnel programme selection
Utilization of greenhouse gas as resource in EOR and storage it underground
Shen Pingping,Jiang Huaiyou
Strategic Study of CAE 2009, Volume 11, Issue 5, Pages 54-59
Global warming is the most serious environmental problem that we ever had. One of the reasons for that focus on the mass emission of greenhouse gas has made the cosmopolitan warming problem more and more serious. It is such a great threaten to our environment that the international community must take active and effective measures. In 2006, a 973 project named "Research for Utilizing Greenhouse Gas as Resource in EOR and Storaging It Underground " was authorized by The Ministry of Science and Technology of the People's Republic of China. The researches include establishing a system suits China`s national conditions and sequestrate CO2 effectively, obtaining society benefit from reducing CO2 emission and obtaining economic benefit from CO2 utilization, developing CO2 storage theories, phase state of multiphase and multicomponent mixtures, nonlinear percolation mechanisms of multiphase and multicomponent mixtures and CO2 capture & transport.. In China the CO2 sequestration security and the efficient use of research is at the international level. From those basic researches above, it is expected to get state owned CO2 storage and utilization technology, which will be served as useful theory and practice basis for efficiently global resource & environment development and sustainable development.
Keywords： greenhouse gas utilization CO2 storage underground enhance oil recovery
The analysis of specific energy applied in Bohai Strait tunnel during TBM construction
Gao Pan,Zou Chong
Strategic Study of CAE 2013, Volume 15, Issue 12, Pages 73-79
The proposed Bohai Strait tunnel is a challenging project, and penetration rate of tunnel boring machine (TBM) is one of the keys. This paper made a contrast between the Clem Jones tunnel in Australia and the Bohai Strait tunnel,and introduced the specific energy used in the Clem Jones tunnel. During the construction of the Clem Jones tunnel, researchers made the analysis and forecasted about the TBM's penetration rate using the specific energy, which was identical to the practical construction very well. This paper concluded that the specific energy can be used in the Bohai Strait tunnel as well as the Clem Jones tunnel,which was based on the comparative analysis of the Clem Jones tunnel and Bohai Strait tunnel.
Keywords： TBM specific energy drilling rate index penetration rate
Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film Article
Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan
Engineering 2023, Volume 29, Issue 10, Pages 198-206 doi: 10.1016/j.eng.2022.10.005
Transparent microwave absorbers that exhibit high optical transmittance and microwave absorption capability are ideal, although having a fixed absorption performance limits their applicability. Here, a simple, transparent, and thermally tunable microwave absorber is proposed, based on a patterned vanadium dioxide (VO2) film. Numerical calculations and experiments demonstrate that the proposed VO2 absorber has a high optical transmittance of 84.9% at 620 nm; its reflection loss at 15.06 GHz can be thermally tuned from –4.257 to –60.179 dB, and near-unity absorption is achieved at 523.75 K. Adjusting only the patterned VO2 film duty cycle can change the temperature of near-unity absorption. Our VO2 absorber has a simple composition, a high optical transmittance, a thermally tunable microwave absorption performance, a large modulation depth, and an adjustable temperature tuning range, making it promising for application in tunable sensors, thermal emitters, modulators, thermal imaging, bolometers, and photovoltaic devices.
Keywords： Tunable microwave absorber VO2 film Optical transparent Near unity absorption Large modulation depth
Jaw Crusher With Large Reduction Ratio and the Modification of Crushing Technology
Rao Qilin
Strategic Study of CAE 2001, Volume 3, Issue 4, Pages 82-87
A new type crushing equipment - the outer moving jaw crusher with large reduction ratio and its technical parameters, as well as its performance characteristics are introduced. The structural nature of large reduction ratio makes it possible to substitute the two or three stage crushing in the traditional crushing flowsheet by only one stage. That is, the successful development of the new type crushing equipment will bring about the change of the crushing technology.
Keywords： cursher large reduction ratio simplification of flowsheet
Analysis of Influencing Factors on Transmission Ratio in Magnetic Metal Belt Transmission
Luo Shanming,Miao Xiexing
Strategic Study of CAE 2002, Volume 4, Issue 3, Pages 73-77
Magnetic metal belt transmission is a new one in which the initial tension no longer solely, but together with the magnetic attraction force produces the friction force. The influencing factors on transmission ratio are analyzed and numerically simulated in this paper, such as effective haulage force, initial tension, magnetic induction intensity, center distance, diameter of the smaller belt pulley and angle of contact. The change laws of transmission ratio along with these influencing factors are studied. The results show that the transmission ratio of magnetic metal belt transmission increases when magnetic induction density, initial tension and center distance increases, and decrease when angle of contact and diameter of the smaller belt pulley increases. It is pointed out that the angle of contact and diameter of the smaller belt pulley can be reduced accordingly because of the effect of magnetic force, and therefore the transmission ratio can increase by 3〜4 times compared with general belt transmission.
Keywords： belt transmission magnetism metal belt transmission ratio
Carbon Sequestration through CO2 Foam-Enhanced Oil Recovery: A Green Chemistry Perspective Perspective
Jennifer A. Clark, Erik E. Santiso
Engineering 2018, Volume 4, Issue 3, Pages 336-342 doi: 10.1016/j.eng.2018.05.006
Enhanced oil recovery (EOR) via carbon dioxide (CO2) flooding has received a considerable amount of attention as an economically feasible method for carbon sequestration, with many recent studies focusing on developing enhanced CO2 foaming additives. However, the potential long-term environmental effects of these additives in the event of leakage are poorly understood and, given the amount of additives injected in a typical CO2 EOR operation, could be far-reaching. This paper presents a summary of recent developments in surfactant and surfactant/nanoparticle-based CO2 foaming systems, with an emphasis on the possible environmental impacts of CO2 foam leakage. Most of the surfactants studied are unlikely to degrade under reservoir conditions, and their release can cause major negative impacts on wildlife. With recent advances in the use of additives (e.g., nonionic surfactants, nanoparticles, and other chemicals) the use of harsh anionic surfactants may no longer be warranted. This paper discusses recent advances in producing foaming systems, and highlights possible strategies to develop environmentally friendly CO2 EOR methods.
Keywords： Surfactants Nanoparticles Carbon sequestration Enhanced oil recovery
cattering-absorbing method for the detection of 16.7 MeV high-energy pulsed gamma
Tan Xinjian,Ouyang Xiaoping,Wang Qunshu
Strategic Study of CAE 2009, Volume 11, Issue 8, Pages 48-51
This paper proposes a new method of diagnosing 16.7 MeV high-energy pulsed gamma, named "scattering-absorbing method" . The ratio of the sensitivity of HEG to that of the LEG can reach 106 to 108 by this new method. The sensitivity of 16.7 MeV high-energy gamma ranges from 10-21 to 10-16 C·cm2. It's better than the traditional method which bases on the magnetic analyzer and Cherenkov detector on some aspects.
Keywords： high-energy gamma Cherenkov detector scattering absorption method
Graphene-metasurface for wide-incident-angle terahertz absorption Research
Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3, Pages 287-436 doi: 10.1631/FITEE.2000079
Keywords： 石墨烯超表面；太赫兹吸收器；欧米伽形石墨烯图案
The Analysis on Output-input Ratio of Artificial Supplementary Energy in Agro-eco-engineering
Bian Yousheng,Liu Yingkun,Bian Jing
Strategic Study of CAE 2006, Volume 8, Issue 8, Pages 28-32
The output-input ratio of the artificial Supplementary energy reflects the function and productivity of an agro-eco-engineering as a whole. It is one of the important indicators measuring the effects of an agro-eco-engineer. The output-input ratio for artificial supplementary energy of Henan Xinxian´10 peasant families has been calculated successively for three years.
Title Author Date Type Operation
The Characterization System of the Ballistic Performance of Armor Magnesium Alloys
Cai Hongnian,Tan Chengwen,Wang Fuchi,Chen Zhiyong
Journal Article
Influence of Particle Size on Laser Absorption and Scanning Track Formation Mechanisms of Pure Tungsten Powder during Selective Laser Melting
Jiayao Zhang, Dongdong Gu, Ying Yang, Hongmei Zhang, Hongyu Chen, Donghuai Dai, Kaijie Lin
Journal Article
The progress of membrane adsorption and absorption
Lin Ligang,Ye Hui,Zhao Lizhi,Ding Xiaoli,Zhang Yuzhong
Journal Article
Scheme comparison of Qiongzhou strait railway tunnel
Tan Zhongsheng,Wang Mengshu,Luo Shixiang
Journal Article
Utilization of greenhouse gas as resource in EOR and storage it underground
Shen Pingping,Jiang Huaiyou
Journal Article
The analysis of specific energy applied in Bohai Strait tunnel during TBM construction
Gao Pan,Zou Chong
Journal Article
Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film
Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan
Journal Article
Jaw Crusher With Large Reduction Ratio and the Modification of Crushing Technology
Rao Qilin
Journal Article
Analysis of Influencing Factors on Transmission Ratio in Magnetic Metal Belt Transmission
Luo Shanming,Miao Xiexing
Journal Article
Carbon Sequestration through CO2 Foam-Enhanced Oil Recovery: A Green Chemistry Perspective
Jennifer A. Clark, Erik E. Santiso
Journal Article
cattering-absorbing method for the detection of 16.7 MeV high-energy pulsed gamma
Tan Xinjian,Ouyang Xiaoping,Wang Qunshu
Journal Article
Graphene-metasurface for wide-incident-angle terahertz absorption
Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com
Journal Article
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