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Journal of Structural and Construction Engineering 2025年第828期90卷 230-239页

作者： Satoshi, Kake Yuji, Ishikawa Takenaka Research & Development Institute Japan College of System Engineering and Science Shibaura Institute of Technology Japan

The authors propose a new defined tensile stress distribution for steel fiber reinforced concrete (SFRC) to evaluate the flexural strength of SFRC beams. It is a simplified formula based on the SFRC tensile stress – tensile strain relationship curves. This study confirmed that the flexural strength of SFRC beams is influenced by the orientation factor of steel fibers which is in turn affected by the fiber amount. The authors also propose a formula for this orientation factor expressed by the fiber volume ratio. Using these proposed formulae, the flexural strength (allowable, yielding, ultimate levels) of SFRC beams could be accurately evaluated. © 2025 Architectural institute of Japan. All rights reserved.

关键词： Tensile stress

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Investigation on environmental factors contributing to bispecific antibody stability and the reversal of self-associated aggregates

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Bioresources and Bioprocessing 2024年第1期11卷 1084-1101页

作者： Nattha Ingavat Nuruljannah Dzulkiflie Jia Min Liew Xinhui Wang Eunice Leong Han Ping Loh Say Kong Ng Yuansheng Yang Wei Zhang Downstream Processing Group Bioprocessing Technology InstituteAgency for ScienceTechnology and Research(A*STAR)SingaporeSingapore Animal Cell Bioprocessing Group Bioprocessing Technology InstituteAgency for ScienceTechnology and Research(A*STAR)SingaporeSingapore Cell Line Development Group Bioprocessing Technology InstituteAgency for ScienceTechnology and Research(A*STAR)SingaporeSingapore

Bispecific antibodies(bsAbs)hold promises for enhanced therapeutic potential surpassing that of their parental monoclonal ***,bsAbs pose great challenges in their manufacturing,and one of the common reasons is their susceptibility to *** on previous studies demonstrating the functionality and potential manufacturability of Fab-scFv format bsAb,this investigation delved into the impact of environmental factors-such as pH,buffer types,ionic strength,protein concentrations,and temperatures-on its stability and the reversal of its self-associated *** acidic,low-salt conditions were found optimal,ensuring bsAb stability for 30 days even at elevated temperature of 40°***,these conditions facilitated the reversal of its self-associated aggregates to monomers during the initial 7-day incubation *** findings underscore the robustness and resilience of Fab-scFv format bsAb,further confirming its potential manufacturability despite its current absence as commercial products.

关键词： Bispecific antibody Fab-scFv Stability Reversible-self association Environmental factors

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Viscous influences on impulsively generated focused jets

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Physical Review Fluids 2024年第8期9卷 L082001页

作者： Xianggang Cheng Xiao-Peng Chen Hang Ding Chun-Yu Zhang Haibao Hu Laibing Jia School of Marine Science and Technology Research & Development Institute of Department of Modern Mechanics Department of Naval Architecture Ocean & Marine Engineering

Impulsively generated focused jets play a significant role in various applications, including inkjet printing, needle-free drug delivery, and microfluidic devices. As the demand for generating jets and droplets from medium to highly viscous liquids increases, understanding the role of viscosity in jetting dynamics becomes crucial. While previous studies have examined the viscous effects on walls, the impact on free surfaces has not been thoroughly understood. This study aims to bridge this gap by integrating experiments with numerical simulations to investigate the viscous effects on focused jet formation. We demonstrate that mass and momentum transfer along the tangential direction of the free surface contribute to focused jet formation, and viscosity plays a key role in this transfer process. The viscosity-induced diffusion of the shear flow and vorticity near the free surface reduces the jet speed. Based on experimental observations and simulation results, we propose an equation to predict the viscous jet velocity. These findings offer new perspectives on viscous interface dynamics in advanced manufacturing and biomedical applications.

关键词： Boundary layers Instability of free-surface flows Viscosity

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AN ASSESSMENT OF FUEL-JET CHARACTERISTICS AND AUTOIGNITION DELAY FOR BIODIESEL B20 BY SIMULATION TOOLS

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UPB Scientific Bulletin, Series D: Mechanical Engineering 2025年第1期2025卷 33-46页

作者： Miron, Lucian Chiriac, Radu Ionescu, Radu Visan, Nicolae Adrian National University of Science and Technology Politehnica Bucharest Romania Research and Development Institute for Gas Turbines COMOTI Bucharest Romania

The use of biodiesel mixtures has become a part of everyday life. The current implementation of B7 biodiesel at the pump and the premise that the near future will make B20 biodiesel compulsory leads to the necessity of an in-depth analysis of how this type of fuel affects the jet characteristics and ignition delay in a compression ignition engine. An experimental and numerical study was carried out to analyze the mentioned characteristics of a tractor diesel engine at full load. Maximum torque and maximum power operating conditions were analyzed. An 3D CFD model was developed for jet characteristics, jet propagation, and ignition delay analysis. As a practical result of this study, the usage of biodiesel B20 fuel (with B7 as an intermediary) is not associated with a substantial change in efficiency and performance and it’s usage could lead to lower levels of emmissions. © 2025, Politechnica University of Bucharest. All rights reserved.

关键词： Diesel engines

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INNOVATIVE ALGINATE-BASED HYBRID COMPOSITE BEADS FOR HEAVY METALS REMOVAL

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UPB Scientific Bulletin, Series B: Chemistry and Materials science 2024年第1期86卷 3-18页

作者： Miron, Andreea Sarbu, Andrei Sandu, Teodor Gavrila, Ana-Mihaela Baroi, Anda Maria Chiriac, Anita-Laura Iordache, Tanta-Verona Iovu, Horia National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM Bucharest Romania Dept. of Polymer Science The National University of Science and Technology POLITEHNICA Bucharest Romania National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM Romania

Nowadays, heavy metal pollution is considered one of the most important environmental issues. Thereby, this paper proposes a novel approach towards obtaining biofriendly hybrid composite beads based on sodium alginate-type biopolymer incorporating inorganic-organic composite synthetized through host-guest polymerization of polyacrylonitrile within a porous titania structure. Firstly, optimal synthesis procedure for developing composites with improved characteristics was established. The new systems were characterized by FTIR, XRD, TGA and SEM. The performed heavy metal adsorption tests indicated that the alginate matrix presents a higher affinity for Cu ions, relative to Zn and Ni ions and a higher efficiency relative to the reference TiO2 beads. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Sodium alginate

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Enhancing Strength-Ductility Synergy of CoCrNi-Based Medium-Entropy Alloy Through Coherent L1_(2)Nanoprecipitates and Grain Boundary Precipitates

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 78-88页

作者： Leilei Li Kaikai Song Qingwei Gao Changshan Zhou Xiaoming Liu Yaocen Wang Xiaojun Bai Chongde Cao School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an710016China Weihai Research Institute of Industrial Technology Shandong UniversityWeihai264209China Research and Development Institute of Northwestern Polytechnical University in ShenzhenShenzhen518057China

The L1_(2)-strengthened Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3)medium-entropy alloy(MEA)with precipitations of grain boundaries has been developed through selective laser melting(SLM)followed by cold rolling and annealing,exhibiting excellent strength-ductility *** as-printed alloy exhibits low yield strength(YS)of~384 MPa,ultimate tensile strength(UTS)of~453 MPa,and uniform elongation(UE)of 1.5%due to the existence of the SLM-induced *** cold rolling and annealing,the YS,UTS,and UE are significantly increased to~739 MPa,~1230 MPa,and~47%,*** enhancement primarily originates from the refined grain structure induced by cold rolling and *** presence of coherent sphericalγ'precipitates(L1_(2)phases)and Al/Ti-rich precipitates at the grain boundaries,coupled with increased lattice defects such as dislocations,stacking faults,and ultrafine deformation twins,further contribute to the property’s *** study highlights the potential of SLM in producing high-strength and ductile MEA with coherent L1_(2)nanoprecipitates,which can be further optimized through subsequent rolling and annealing *** findings offer valuable insights for the development of high-performance alloys for future engineering applications.

关键词： Medium-entropy alloy Selective laser melting Precipitation Strength Ductility

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STATE OF THE ART OF CONVENTIONAL WIND TURBINES development

International Journal of Mechatronics and Applied Mechanics

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International Journal of Mechatronics and Applied Mechanics 2025年第19期2025卷 205-215页

作者： Popescu, Ionela-Mihaela Popescu, Valentin-Serban Vasilescu, Alexandra-Gabriela Constantin, Victor Avram, Mihai National University of Science and Technology Politehnica Bucharest Romania National Institute of Research and Development in Mechatronics and Measurement Technique Bucharest Romania

This paper aims to analyze the evolution of wind turbines in the last decade and place it in the context of environmental changes that have occurred in recent years. The use of artificial intelligence, genetic algorithms, and machine learning in the field of wind energy may increase energy production and ensures predictive maintenance of installations. Implementing AI at the level of wind turbine control systems brings benefits such as: reduced data analysis time;standardized data labeling;increased performance and reduced maintenance costs. Another method for determining the need for repairs is the use of machine learning, which can reduce downtime and extend the life of the turbine. Genetic algorithms can increase the efficiency of blade pitch and durability of vertical axis wind turbines. Analysis of system errors and multiple key parameters facilitates maintenance and reduces operating costs. These advanced control methods for both horizontal axis and vertical axis wind turbines increase efficiency, provide optimized system parameters and control designs as output. The production of wind turbine components and the reduction of carbon dioxide emissions can be achieved through 3D printing technology. Using environmentally friendly materials such as polylactic acid to make parts in the construction of wind turbines reduces the pollution problems generated in the production process. This makes wind turbines a sustainable and environmentally friendly power generation device. The use of advanced materials reduces the mass of turbine components, which makes it much easier to transport and install. In addition to these advantages, transportation costs are also reduced because it no longer requires large transport vehicles and traffic disruption. © 2025 The Author(s).

关键词： Vertical axis wind turbine

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research progress of slippage characteristic and gas film stability enhancement methods on biomimetic hydrophobic surfaces

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Journal of Hydrodynamics 2024年第1期36卷 87-101页

作者： Meng-zhuo Zhang Hai-bao Hu Liu-zhen Ren Lu-yao Bao Jun Wen Luo Xie School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an710072China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen518063China

The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of surface comes from the interfacial *** now,it is a hotspot to grasp the slippage characteristic and explore slippage enhancement *** paper not only summarizes our numerical simulation and experimental results of slippage characteristic at the solid-liquid interface(SLI)of hydrophobic surfaces(HS)and the gas-liquid interface(GLI)of superhydrophobic surfaces(SHS)in recent years,but also introduces some innovative methods that can effectively improve the gas film stability and drag reduction effect of ***,we used the molecular dynamics(MD)simulation method to figure out the effect of the solid-liquid interaction strength,the system temperature and the shear rate on the slippage of SLI,and expound their action mechanism from molecular ***,by MD and multibody dissipative particle dynamics(MDPD)method,the slippage behavior at the GLI was studied under the influence of the microstructure size and the flow driving *** proposed a new kind of hybrid slip boundary condition model to describe the slippage characteristic on *** addition,we found through experiment that a three-dimensional backflow will appear on the GLI under the interfacial adsorption of surfactants,and the backflow direction will reverse with the change of GLI ***,we put forward the wettability step structure and gas injection method to enhance the stability and drag reduction effect of the gas film on SHS.

关键词： Hydrophobic surface superhydrophobic surface interfacial slip underwater drag reduction

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research on the quasi-isentropic driving model of aluminized explosives in the detonation wave propagation direction

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Defence technology（防务技术） 2024年第2期32卷 596-618页

作者： Hongfu Wang Yan Liu Fan Bai Chao He Yingliang Xu Qiang Zhou Chuan Xiao Fenglei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China China Research and Development Academy of Machinery Equipment Beijing100089China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China

Taking CL-20(Hexanitrohexaazaisowurtzitane)-based aluminized explosives with high gurney energy as the research object, this research experimentally investigates the work capability of different aluminized explosive formulations when driving metal flyer plates in the denotation wave propagation *** research results showed that the formulations with 43 μm aluminum(Al) powder particles(The particle sizes of Al powder were in the range of 2~43 μm) exhibited the optimal performance in driving flyer plates along the denotation wave propagation direction. Compared to the formulations with Al powder 13 μm, the formulations with Al powder 2 μm delivered better performance in accelerating metal flyer plates in the early stage, which, however, turned to be poor in the later stage. The CL-20-based explosives containing 25% Al far under-performed those containing 15% Al. Based on the proposed quasi-isentropic hypothesis, relevant isentropy theories, and the functional relationship between detonation parameters and entropy as well as Al reaction degree, the characteristic lines of aluminized explosives in accelerating flyer plates were theoretically studied, a quasi-isentropic theoretical model for the aluminized explosive driving the flyer plate was built and the calculation methods for the variations of flyer plate velocity, Al reaction degree, and detonation product parameters with time and axial positions were developed. The theoretical model built is verified by the experimental results of the CL-20-based aluminized explosive driving flyer plate. It was found that the model built could accurately calculate the variations of flyer plate velocity and Al reaction degree over time. In addition, how physical parameters including detonation product pressure and temperature varied with time and axial positions was identified. The action time of the positive pressure after the detonation of aluminized explosives was found prolonged and the downtrend of the temperature was

关键词： Aluminized explosive Flyer plate experiment Quasi-isentropic theoretical model Al reaction Driving characteristics

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High-speed penetration of ogive-nose projectiles into thick concrete targets:Tests and a projectile nose evolution model

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Defence technology（防务技术） 2024年第2期32卷 553-571页

作者： Xu Li Yan Liu Junbo Yan Zhenqing Shi Hongfu Wang Yingliang Xu Fenglei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China China Research and Development Academy of Machinery Equipment Beijing100089China

The majority of the projectiles used in the hypersonic penetration study are solid flat-nosed cylindrical projectiles with a diameter of less than 20 *** study aims to fill the gap in the experimental and analytical study of the evolution of the nose shape of larger hollow projectiles under hypersonic *** the hypersonic penetration test,eight ogive-nose AerMet100 steel projectiles with a diameter of 40 mm were launched to hit concrete targets with impact velocities that ranged from 1351 to 1877 m/*** erosion of the projectiles was observed during high-speed penetration of heterogeneous targets,and apparent localized mushrooming occurred in the front nose of recovered *** examining the damage to projectiles,a linear relationship was found between the relative length reduction rate and the initial kinetic energy of projectiles in different penetration ***,microscopic analysis revealed the forming mechanism of the localized mushrooming phenomenon for eroding penetration,i.e.,material spall erosion abrasion mechanism,material flow and redistribution abrasion mechanism and localized radial upsetting deformation ***,a model of highspeed penetration that included erosion was established on the basis of a model of the evolution of the projectile nose that considers radial upsetting;the model was validated by test data from the literature and the present *** upon the impact velocity,v0,the projectile nose may behave as undistorted,radially distorted or *** to the effects of abrasion of the projectile and enhancement of radial upsetting on the duration and amplitude of the secondary rising segment in the pulse shape of projectile deceleration,the predicted DOP had an upper limit.

关键词： High-speed penetration Concrete target Erosion Projectile nose evolution model

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