1,265 research outputs found
Compare of SCIENCE STUDIES Theory System in China and Foreign Countries Based on Scientometrics
No full textDuring the last 10 years, a new framework of SCIENCE STUDIES Theory System has been formed with the progress of science and technology (S&T). Starting with the research tradition and paradigm, we study the main academic fields, the relative disciplines and focuses of SCIENCE STUDIES with the analytical tools and the methods in Scientometrics. The results of study conclude the following:
-in the applied. field, “Science”, “Technology”, “Innovation” and corresponding “S&T Policy and Management” are found in the mainstream;
-in the methodological field, “Webometrics”, “Knowledge Mapping and Visualization Technology”, which are the advanced domains, have developed greatly;
-in the theoretical field, scholars and scientists start to focus on the interaction of Science-Technology-Innovation, the evolution of some disciplines in natural science and the theory of cooperation in S&T.
Basing on the above, the construction of SCIENCE STUDIES Theory System in the new century is discussed
Compare of Science Studies Theory System in China and Foreign Countries Based on Scientometrics
No full textDuring the last 10 years, a new framework of SCIENCE STUDIES Theory System has been formed with the progress of science and technology (S&T). Starting with the research tradition and paradigm, we study the main academic fields, the relative disciplines and focuses of SCIENCE STUDIES with the analytical tools and the methods in Scientometrics. The results of study conclude the following:
l in the applied field, “Science”, “Technology”, “Innovation” and corresponding “S&T Policy and Management” are found in the mainstream;
l in the methodological field, “Webometrics”, “Knowledge Mapping and Visualization Technology”, which are the advanced domains, have developed greatly;
l in the theoretical field, scholars and scientists start to focus on the interaction of Science-Technology-Innovation, the evolution of some disciplines in natural science and the theory of cooperation in S&T.
Basing on the above, the construction of SCIENCE STUDIES Theory System in the new century is discussed
Retracted Article: Binding Mechanism of Aviation Wire Harness Based on Improved Particle Swarm Optimization
No full textWe, the Editor and Publisher of Applied Artificial Intelligence, have retracted the following article:Zhang Maoyun, Xi Huizhuang, Tang Chen, Jiang Yuheng, Zhang Ziyan & Tian Chunlin, Binding Mechanism of Aviation Wire Harness Based on Improved Particle Swarm Optimization, Applied Artificial Intelligence https://doi.org/10.1080/08839514.2024.2327009Since publication, concerns have been raised by the authors about the integrity of the data presented in the article. The authors have identified issues with the programming statistics that have led to conclusions which are not credible and have requested the retraction of the article.We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions.The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”
An efficient implementation of transonic aeroelastic tailoring based on a reduced-order model using structural dynamic reanalysis method
No full textDue to fuel efficiency, advanced aerodynamic and structural concern, more and more composite materials used in aircraft desgin. In composite structure aeroelastic tailoring process, an accurate and efficient method to evaluate the aeroelastic stability is very required. The traditional CFD-based POD/ROM has been shown its accuracy and efficiency for transonic aeroelastic analysis at fixed system. In aeroelastic tailoring process, in order to meet the requirements of aeroelastic performance, the parameters of the composite structure need to be modified repeatedly and the aerodynamic model have to be reconstructed. However, these reconstruction procedures take a considerable time, and greatly increasing the time cost of the aircraft design. To develop a more efficient composite structure aeroelastic tailoring method, starting with improving the efficiency of aeroelastic performance evaluation, this paper propose an approximate aeroelastic characteristics evaluation method based CFD-based POD/ROM by introducing the structural dynamic reanalysis method. The improved AGARD 445.6 composite wing was employed to verify the accuracy and efficiency of the proposed method. The results show that the proposed evaluation method can not only accurately predict the aeroelastic response of the structure, but also greatly improving the efficiency of transonic composite structure aeroelastic tailoring.</p
An efficient implementation of aeroelastic tailoring based on efficient computational fluid dynamics-based reduced order model
No full textCurrent and future trends in the aerospace industry leverage on the potential benefits provided by lightweight materials that can be tailored to realize desired mechanical characteristics when loaded. For aircraft design, the deployment of aeroelastic tailoring is hindered by the need to re-compute, for any possible modification of the structure, the dependence of the aerodynamic field on the underlying structural properties. To make progress in this direction, the work presents a rapid computational fluid dynamics based aeroelastic tool which is built around a reduced order model for the aerodynamics that is updated for any modification of the structure by using the structural dynamics reanalysis method. The aeroelastic tailoring tool is demonstrated in transonic flow for the AGARD 445.6 wing, suitably modified with composite materials. It was found that the proposed method provides accurate engineering predictions for the aeroelastic response and stability when the structure is modified from the baseline model
Solid-State Synthesis of Nitrogen-doped Carbon Nanotubes and CO_2 Adsorption Performance
No full textNitrogen doped carbon nanotubes (NCNT) were synthesized via a solid-phase carbonization method at 600-1000 ℃ using the copolymer of divinylbenzene and 1-vinyl-3-butylimidazolium bromide ([VBIm]Br) as the carbon source and potassium ferricyanide as the catalyst precursor. The samples were thoroughly characterized by SEM, TEM, Raman spectroscopy,XPS and nitrogen physisorption. NCNT were further activated at 600-800 ℃ by using potassium hydroxide as the activation agent. Both treatment temperature and time determined the pore structure of NCNT. The analysis of CO_2 adsorption proves that the NCNT with higher BET surface area often have better adsorption capacity. The specific adsorption capacity (mmol ? cm~(-3)) of micropores is found to linearly depend on the nitrogen content
Figure 6 in A new species of the genus Crocidura from China based on molecular and morphological data (Eulipotyphla: Soricidae)
No full textFigure 6. Images of crania and mandibles of Crocidura anhuiensis Zhang, Zhang & Li, sp. nov. (AhuHST1703) and C. attenuata (AhuHS12). A–C. C. anhuiensis Zhang, Zhang & Li, sp. nov., crania, dorsal, ventral and laterial views. D. C. anhuiensis Zhang, Zhang & Li, sp. nov., mandible. E–G. C. attenuata, crania, dorsal, ventral and laterial views. H. C. attenuata, mandible.Published as part of Zhang, Heng, Wu, Guiyou, Wu, Yanqing, Yao, Jianfei, You, Shuo, Wang, Chencheng, Cheng, Feng, Chen, Jingjing, Tang, Mingxia, Li, Chunlin & Zhang, Baowei, 2019, A new species of the genus Crocidura from China based on molecular and morphological data (Eulipotyphla: Soricidae), pp. 279-293 in Zoological Systematics 44 (4) on page 288, DOI: 10.11865/zs.201927, http://zenodo.org/record/461781
Cauliflower-derived porous carbon without activation for electrochemical capacitor and CO2 capture applications
No full textCarbon materials have attracted great attention in CO2 capture and energy storage due to their excellent characteristics such as tunable pore structure, modulated surface properties and superior bulk conductivities, etc. Biomass, provided by nature with non-toxic, widespread, abundant, and sustainable advantages, is considered to be a very promising precursor of carbons for the view of economic, environmental, and societal issues. However, the preparation of high-performance biomass-derived carbons is still a big challenge because of the multistep process for their synthesis and subsequent activation. Herein, hierarchically porous structured carbon materials have been prepared by directly carbonizing dried cauliflowers without any addition of agents and activation process, featuring with large specific surface area, hierarchically porous structure and improved pore volume, as well as suitable nitrogen content. Being used as a solid-state CO2 adsorbent, the obtained product exhibited a high CO2 adsorption capacity of 3.1 mmol g(-1) under 1 bar and 25 degrees C and a remarkable reusability of 96.7% retention after 20 adsorption/regeneration cycles. Our study reveals that choosing a good biomass source was significant as the unique structure of precursor endows the carbonized product with abundant pores without the need of any post-treatment. Used as an electrode material in electrochemical capacitor, the non-activated porous carbon displayed a fairly high specific capacitance of 228.9 F g(-1) at 0.5 A g(-1) and an outstanding stability of 99.2% retention after 5000 cycles at 5 A g(-1)
InP-base resonant tunneling diodes
No full textWe have fabricated In_0.53Ga_0.47As/AlAs/InP resonant tunneling diodes (RTDs) based on the air-bridge technology by using electron beam lithography processing.The epitaxial layers of the RTD were grown on semi-insulating (100) InP substrates by molecular beam epitaxy.RTDs with a peak current density of 24.6 kA/cm~2 and a peak-to-valley current ratio of 8.6 at room temperature have been demonstrated
Approximation for probability of coverage in softly inhibitive cellular networks
No full textAbstract The Strauss point process is a very popular model for describing the random cellular networks, yet several key statistical properties such as intensity, empty space function, and probability generating functional have remained elusive. This article addresses these issues by first leveraging the Poisson saddle point method to approximate the distance‐conditioned intensity for Strauss point processes. Subsequently, the author derives an analytically tractable expression for the distribution of empty space distance based on a conditional thinning mechanism. Additionally, the author establishes an upper bound for the probability generating functional in Strauss point processes, which is crucial for evaluating the Laplace transform of cumulative interference in relevant cellular networks. These findings facilitate the systematic derivation of spatially averaged probability of coverage, and the accuracy of analytic results is validated through simulations
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