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Developing an engineering-statistical model for estimating aerodynamic coefficients of helicopter fuselage

Chinese Journal of Aeronautics 2017年第1期30卷 175-185页

作者： Hossein Sheikhi Abas Saghaie Department of industrial Engineering Science and Research Branch Islamic Azad University

The design of the geometric shape of a helicopter fuselage poses a serious challenge for designers. The most important parameter in determining the shape of the helicopter fuselage is its aerodynamic coefficients. These coefficients are determined using two methods： wind tunnel test and computational fluid dynamics（CFD） simulation. The first method is expensive, time-consuming and limited. In addition, estimates in regions away from data can be poor. The second method,due to the limitations of numerical solution, the number of nodes and the used solution, is often inaccurate. In this paper, with the aim of accelerating the design process and achieving results with reasonable engineering accuracy, an engineering-statistical model which is useful for estimating the aerodynamic coefficients was developed, which mitigated the drawbacks of these two ***, by combining CFD simulation and regression techniques, an engineering model was presented for the estimation of aerodynamic coefficients. Then, by using the data from a wind tunnel test and implementation of statistical adjustment, the engineering model was modified and an engineering-statistical model was obtained. By spending less time and cost, the final model provided the aerodynamic coefficients of a helicopter fuselage at the desired angles of attack with reasonable accuracy. Finally, three numerical examples were provided to illustrate the application of the proposed model. Comparative results demonstrate the effectiveness of the engineering-statistical model in estimating the aerodynamic coefficients of a helicopter fuselage.

关键词： Aerodynamic coefficients Computaticnal fluid dynamics (CFD) Engineering-statistical model Helicopter fuselage Wind tunnel test

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Organic heterostructures composed of one-and two-dimensional polymorphs for photonic applications

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Science China Chemistry 2020年第10期63卷 1477-1482页

作者： Yue Yu Yi-Chen Tao Sheng-Nan Zou Zhi-Zhou Li Chang-Cun Yan Ming-Peng Zhuo Xue-Dong Wang Liang-Sheng Liao Department of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Department of Organic Optoelectronics Jiangsu Industrial TechnologyResearch Institute(JITR1)Wujiang 215211China

Organic heterostructures(OHSs)consist of organic micro/nanocrystals are of essential importance for the construction of integrated optoelectronics in the ***,the scarcity of materials and the problem of phase separation still hinder the fine synthesis of ***,based on theαphase one-dimensional(1D)microrods and theβphase 2D microplates of one organic compound 3,3′-((1 E,1′E)-anthracene-9,10-diylbis(ethane-2,1-diyl))dibenzonitril(m-B2BCB),we facilely synthesized the OHSs composed of these two polymorph phases,whose growth mechanism is attributed to the low lattice mismatch rate of5.8%between(001)plane ofαphase(trunk)and(010)crystal plane ofβphase(branch).Significantly,the multiport in/output channels can be achieved in the OHSs,which demonstrates the structure-dependent optical signals with the different output channels in the ***,our experiment exhibits the great prospect of polymorphism in OHSs,which could provide further applications on multifunctional organic integrated photonics circuits.

关键词： fine synthesis polymorph heterostructure integrated optoelectronics lattice mismatch

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Tuning the ratio of Bi/Bi_(2)O_(3)in Bi/PNC nanosheet for highefficiency electrosynthesis hydrogen peroxide

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Nano research 2023年第7期16卷 9050-9058页

作者： Zhikang Bao Jinyan Zhao Shijie Zhang Xiaoge Peng Yizhen Shao Chenghang Jiang Zaixiang Xu Xing Zhong Zihao Yao Jianguo Wang Institute of industrial Catalysis College of Chemical EngineeringState Key Laboratory Breeding Base of Green-Chemical Synthesis TechnologyZhejiang University of TechnologyHangzhou 310032China

Electrocatalytic two-electron oxygen reduction reaction(2e-ORR)is a promising method for producing green and sustainable H_(2)O_(2)but lacks high selectivity and yields *** it is critical to develop catalysts that meet industrial ***,we report the different ratios of Bi0/Bi^(3+)supported on a phosphorus,nitrogen,and carbon nanosheet(Bi/PNC),which can reduce O_(2) to H_(2)O_(2)with high selectivity(up to 97.75%at 0.4 VRHE)in 0.1 M KOH electrolyte and retain 97%selectivity even after 100 h *** a homemade flow-cell system was built for electrocatalytic production of H_(2)O_(2)under an O_(2) atmosphere using an improved gas diffusion *** Bi/PNC-4 can achieve a high H_(2)O_(2)yield of 2.76 mol·gcatalyst^(-1)·h^(-1)(alkaline),5.29 mol·gcatalyst^(-1)·h^(-1)(neutral),and 3.50 mol·gcatalyst^(-1)·h^(-1)(acid)in universal pH *** in-situ generated H_(2)O_(2)can function as a degradation agent for efficiently degrading pesticides and *** outstanding selectivity and activities are attributed to the synergistic effects of Bi0 and Bi^(3+)that promote proton-coupled reduction of O_(2) to OOH^(*)(ΔGOOH^(*)=4.27 eV),and the formation of H_(2)O_(2).The fast yield of H_(2)O_(2)on Bi/PNC catalysts in flow-cell provides a promising path of electrocatalytic 2e-ORR for practical H_(2)O_(2)production.

关键词： hydrogen peroxide nanosheet Bi_(2)O_(3) Bi degradation

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A generalized formula for two-dimensional diffusion of CO in graphene nanoslits with different Pt loadings

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Green Energy & Environment 2020年第3期5卷 322-332页

作者： Chenglong Qiu Yinbin Wang Yuejin Li Xiang Sun Guilin Zhuang Zihao Yao Shengwei Deng Jianguo Wang Institute of industrial Catalysis State Key Laboratory Breeding Base of Green-Chemical Synthesis TechnologyCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou310032China

Catalytic performance of supported metal catalysts not only depends on the reactivity of metal,but also the adsorption and diffusion properties of gas molecules which are usually affected by many factors,such as temperature,pressure,properties of metal clusters and substrates,*** explore the impact of each of these macroscopic factors,we simulated the movement of CO molecules confined in graphene nanoslits with or without supported Pt *** results of molecular dynamics simulations show that the diffusion of gas molecules is accelerated with high temperature,low pressure or low surface-atom number of supported ***,the supported metal nanoparticles greatly affect the gas diffusion due to the adsorption of gas ***,to bridge a quantitative relationship between microscopic simulation and macroscopic properties,a generalized formula is derived from the simulation data to calculate the diffusion *** work helps to advise the diffusion modulation of gas molecules via structural design of catalysts and regulation of reaction conditions.

关键词： Gas diffusion Graphene nanoslits Supported Pt nanoparticles Molecular dynamics simulation

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Microstructure and properties evolution of Al-17Si-2Fe alloys with addition of quasicrystal Al-Mn-Ti master alloy

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Rare Metals 2020年第10期39卷 1210-1221页

作者： Jing Zhang Zhou-Yi Pang Ling Wang Chi-Chi Sun Ning Liu Hong-Mei Chen Zhao-Xia Cheng Ke Li School of Metallurgy and Materials Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600China Zhangjiagang industrial Technology research Institute Jiangsu University of Science and TechnologyZhangjiagang 215600China School of Materials Science and Engineering Yingkou Institute of TechnologyYingkou 115014China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The Fe-rich intermetallic compounds in Al-17Si-2 Fe were modified via Al-Mn-Ti quasicrystal master *** effect of master alloy content on the Fe-rich phase morphology was studied by scanning electron microscope(SEM)and thermodynamic *** show that the microstructure of the Al-Mn-Ti master alloy consists of binary quasicrystal matrix and ternary AlMnTi secondary *** evolutive tendency of Fe-rich intermetallic compounds with content of quasicrystal Al-Mn-Ti master alloy increasing can be described as follows:long needle-shapedβphase for Al-17 Si-2 Fe alloy,long plate-shaped ternaryδphase for 3 wt%master alloy addition,Chinese-script and polyhedralαphases for 4 wt%master alloy addition and finer plate-shaped quaternaryδphase with a phases for 5 wt%master alloy *** ultimate tensile strength of the Al-17 Si-2 Fe alloy with4 wt%master alloy addition(a mass ratio of w(Mn)/w(Fe)≈0.7)increases by 23.8%and the friction coefficient decreases from 0.45 to 0.35 compared with those of Mnfree alloy.α-Fe phases have less negative effect on the matrix compared with the long needle-shapedβphase and the plate-shapedδphase.

关键词： Fe-rich intermetallic compounds Al-Mn-Ti quasicrystal alloy Microstructure Mechanical properties Friction coefficient

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CFD simulations for longwall gas drainage design optimisation

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International Journal of Mining Science and Technology 2017年第5期27卷 777-782页

作者： Qin Johnny Qu Qingdong Guo Hua Coal Mining research Program The Commonwealth Scientific and Industrial Research Organisation(CSIRO)Brisbane 883Australia

Computational fluid dynamics(CFD) simulation is an effective approach to develop and optimise gas drainage design for underground longwall coal mining. As part of the project supported by the Australian Government Coal Mining Abatement Technology Support Package(CMATSP), threedimensional CFD simulations were conducted to test and optimise a conceptual design which proposes using horizontal boreholes to replace vertical boreholes at an underground coal mine in *** performance between a vertical borehole and a horizontal borehole was first carried out to compare their capacity and effectiveness. Then a series of cases with different horizontal borehole designs were simulated to optimise borehole configuration parameters such as location, diameter, and number of boreholes. The study shows that the horizontal borehole is able to create low pressure sinks that protect the workings from goaf gas ingresses by changing goaf gas flow directions, and that it has the advantage to continuously maintain such low pressure sinks near the tailgate as the longwall advances. An example of optimising horizontal borehole locations in the longwall lateral direction is also given in this paper.

关键词： Goaf gas drainage Horizontal borehole CFD simulation Design optimisation Mining abatement technology

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Higher leaf area through leaf width and lower leaf angle were the primary morphological traits for yield advantage of japonica/indica hybrids

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Journal of Integrative Agriculture 2020年第2期19卷 483-494页

作者： WEI Huan-he YANG Yu-lin SHAO Xing-yu SHI Tian-yi MENG Tian-yao LU Yu TAO Yuan LI Xin-yue DING En-hao CHEN Ying-long DAI Qi-gen jiangsu Key Laboratory of Crop Genetics and Physiology/jiangsu Key Laboratory of Crop Cultivation and Physiology/jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/research Institute of Rice industrial Engineering Technology Yangzhou UniversityYangzhou 225009P.R.China Joint International research Laboratory of Agriculture and Agri-Product Safety Ministry of Education of ChinaYangzhou UniversityJiangsu 225009P.R.China

The yield potential of japonica/indica hybrids(JIH)has been achieved over 13.5 t ha–1 in large-scale rice fields,and some physiological traits for yield advantage of JIH over japonica inbred rice(JI)and indica hybrid rice(IH)were also *** date,little attention has been paid to morphological traits for yield advantage of JIH over JI and *** this reason,three JIH,three JI,and three IH were field-grown at East China(Ningbo,Zhejiang Province)in 2015 and *** with JI and IH,JIH had 14.3 and 20.8%higher grain yield,respectively,attributed to its more spikelets per panicle and relatively high percentage of filled *** advantage in spikelets per panicle of JIH over JI and IH was shown in number of grains on the upper,middle,and lower *** with JI and IH,JIH had higher leaf area through leaf width and lower leaf angle of upper three leaves,higher leaf area index and leaf area per tiller at heading and maturity stages,higher stem weight per tiller and K and Si concentrations of stem at maturity,higher dry matter weight in leaf,stem,and panicle at heading and maturity stages,and higher biomass accumulation after heading and lower biomass translocation from stem during *** width of upper three leaves were correlated positively,while leaf angle of upper three leaves were correlated negatively with biomass accumulation after heading,stem weight per tiller,and per unit *** results indicated that the grain yield advantage of JIH was ascribed mainly to the more spikelets per panicle and relatively high percentage of filled *** leaf area through leaf width and more erect leaves were associated with improved biomass accumulation and stem weighing during ripening,and were the primary morphological traits underlying higher grain yield of JIH.

关键词： japonica/indica hybrids plant-type traits leaf morphology

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Mechanisms and biotechnological applications of transcription factors

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Synthetic and Systems Biotechnology 2023年第4期8卷 565-577页

作者： Hehe He Mingfei Yang Siyu Li Gaoyang Zhang Zhongyang Ding Liang Zhang Guiyang Shi Youran Li Key Laboratory of industrial Biotechnology Ministry of EducationSchool of BiotechnologyJiangnan UniversityWuxiJiangsu Province 214122PR China National Engineering research Center of Cereal Fermentation and Food Biomanufacturing Jiangnan University1800 Lihu AvenueWuxiJiangsu Province 214122PR China jiangsu Provisional research Center for Bioactive Product Processing Technology Jiangnan University1800 Lihu AvenueWuxiJiangsu Province 214122PR China

Transcription factors play an indispensable role in maintaining cellular viability and finely regulating complex internal metabolic *** crucial bioactive functions rely on their ability to respond to effectors and concurrently interact with binding *** advancements have brought innovative insights into the understanding of transcription *** this review,we comprehensively summarize the mechanisms by which transcription factors carry out their functions,along with calculation and experimental-based methods employed in their ***,we highlight recent achievements in the application of transcription factors in various biotechnological fields,including cell engineering,human health,and ***,the current limitations of research and provide prospects for future investigations are *** review will provide enlightening theoretical guidance for transcription factors engineering.

关键词： Transcription factors Binding sites Database-based prediction Experimental identification Cell engineering Biomanufacturing

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Dynamic Interaction Analysis of Coupled Axial-Torsional-Lateral Mechanical Vibrations in Rotary Drilling Systems

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Structural Durability & Health Monitoring 2025年第1期19卷 77-103页

作者： Sabrina Meddah Sid Ahmed Tadjer Abdelhakim Idir Kong Fah Tee Mohamed Zinelabidine Doghmane Madjid Kidouche Applied Automation Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of Electrical and Electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the Electrification of industrial Enterprises University of BoumerdesBoumerdes35000Algeria Electrical Engineering Department Mohamed Boudiaf University of M’silaM’sila28000Algeria Department of Civil and Environmental Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary research Center for Construction and Building Materials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

Maintaining the integrity and longevity of structures is essential in many industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale systems in petroleum drilling,a strong emphasis on structural durability and monitoring is *** study focuses on the mechanical vibrations that occur in rotary drilling systems,which have a substantial impact on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which might lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm to the system’s components since they are difﬁcult to be detected and controlled in real *** study investigates the dynamic interactions of these vibrations,speciﬁcally in their high-frequency modes,usingﬁeld data obtained from measurement while ***ﬁndings have demonstrated the effect of strong coupling between the high-frequency modes of these vibrations on drilling sys-tem *** obtained results highlight the importance of considering the interconnected impacts of these vibrations when designing and implementing robust control ***,integrating these compo-nents can increase the durability of drill bits and drill strings,as well as improve the ability to monitor and detect ***,by exploiting theseﬁndings,the assessment of structural resilience in rotary drilling systems can be ***,the study demonstrates the capacity of structural health monitoring to improve the quality,dependability,and efﬁciency of rotary drilling systems in the petroleum industry.

关键词： Rotary drilling systems mechanical vibrations structural durability dynamic interaction analysis ﬁeld data analysis

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Boosting photocatalytic degradation of RhB via interfacial electronic effects between Fe-based ionic liquid and g-C_3N_4

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Green Energy & Environment 2019年第2期4卷 198-206页

作者： Xiaowei Li Bin Wang Yuhong Huang Jun Di Jiexiang Xia Wenshuai Zhu Huaming Li School of Chemistry and Chemical Engineering Institute for Energy Research Jiangsu University

The Fe-based ionic liquid doped g-C_3N_4(Fee CN) photocatalyst was firstly prepared base on ultrathin g-C_3N_4 obtained by multiple calcination method with a metal-based reactive ionic liquid [Omim]FeCl_4 for the degradation of Rhodamine B(RhB). Experimental results revealed that Fe3+species were doped into the framework of g-C_3N_4. The effect of the amount of Fe-doping on the catalytic activity was performed. The result showed that the Fee CN could effectively degrade RhB under the condition of visible light irradiation. The photocurrent analysis showed that the incorporation of Fe^(3+)into g-C_3N_4 material could accelerate the separation of the photogenerated carriers *** the same time, the reactive species generated during the photodegradation process were tested by radicals trapping experiments and electron spin resonance(ESR). It was proposed that the synergistic effect of■ and ·OH contributed to degrade RhB efficiently.

关键词： g-C3N4 [Omim]FeCl4 Photocatalytic Visible light Active species

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