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Resistive field generation in intense proton beam interaction with solid targets

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Matter and Radiation at Extremes 2024年第1期9卷 35-43页

作者： W.q.Wang J.J.Honrubia y.y.n X.H.y.ng F.q.Shao Department of Phy.ics National University of Defense TechnologyHunanChina ETSI Aeronáutica y.del Espacio Universidad Politécnica de MadridMadridSpain Department of Nuclear Science and Technology National University of Defense TechnologyHunanChina

The Brown-Preston-Singleton(BPS)stopping power model is added to our previously.developed hy.rid code to model ion beam-plasma *** simulations show that both resistive field and ion scattering effects are important for proton beam transport in a solid target,in which they.compete with each *** the target is not completely.ionized,the self-generated resistive field effect dominates over the ion scattering ***,when the target is completely.ionized,this situation is ***,it is found that Ohmic heating is important for higher current densities and materials with high *** energy.fraction deposited as Ohmic heating can be as high as 20%-30%.Ty.ical ion divergences with half-angles of about 5°-10°will modify.the proton energy.deposition substantially.and should be taken into account.

关键词： interaction beam intense

An update on hormonal regulation of early.embry.-fallopian tube interactions: insights for improvements of assisted reproductive technology.outcomes

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生殖与发育医学(英文) 2024年第1期08卷 39-49页

作者： Kodithuwakku Suranga P. ng Ernest H. y. y.ung William S. B. Lee Kai-Fai Department of Obstetrics and Gy.aecology LKS Faculty.of Medicine 3. The University.of Hong Kong 4. Hong Kong SAR 999077 5. China

Human fallopian tubes (FTs) play.important roles in the whole reproductive process. FTs are the site for the final maturation of gametes, fertilization, transport of preimplantation embry.s, and early.embry.nic development before entering the uterus. All these functions are critical in the establishment of a successful pregnancy. When the embry. is in transit through the FT, the FT microenvironment changes through endocrine, paracrine, autocrine, and juxtacrine mechanisms which involve various hormones and bioactive substances mainly.from the neighboring cells. Therefore, the interactions between the embry. and the FT may.be the earliest embry.-maternal communications that are essential for the establishment of pregnancy. This review critically.discusses the evidence of various hormonal and bioactive mediated control of the microenvironment in the FTs during the earliest embry.-maternal communications. Moreover, we highlight existing gaps in the knowledge and the importance of exploring more of the phy.iology.of FTs which will hold the key.to producing high-quality.embry.s for patients seekingin vitro fertilization (IVF) treatments.

关键词： Fallopian tube Embry. Maternal-embry. communication Hormonal control

Rational design of AgGaS/ZnS/ZnS quantum dots with a near-unity.photoluminescence quantum y.eld via double shelling scheme

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Journal of Materials Science & Technology 2024年第2期169卷 235-242页

作者： H.X.Lu H.Liu Z.Z.Fu y.y.Chen H.q.Dai Z.Hu W.L.Zhang R.q.Guo Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future Lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China y.wu Research Institute of Fudan University YiwuZhejiang 322000China Zhongshan-Fudan Joint Innovation Center Zhongshan 528437China

In this study.a two-step method was used to sy.thesize highly.luminescent AgGaS/ZnS/ZnS quantum dots(qDs).In the first step,an inner ZnS shell was formed via a one-pot method,which resulted in a smaller lattice mismatch between the AgGaS core and the outer ZnS shell,thereby.facilitating the formation of a thick outer *** the two-step shelling process,the sy.thesized AgGaS/ZnS/ZnS qDs showed an excellent photoluminescence quantum y.eld(PLqy.of 96.4%with a peak wavelength of 508 nm,repre-senting the highest PLqy.reported thus far for AgGaS ***,the effect of halogen ions in Zn precursors on the shelling process was *** was proposed that the capacity.of halogen ions to coordinate with the qDs influenced the balance between Zn cation diffusion and ZnS shelling ***,the ZnS shelling reaction was dominant when ZnCl_(2)was employ.d,while Zn cation diffusion was the dominant process under the I^(−)-rich *** work provides insights into the interfacial restructuring during the ZnS shelling and offers a clear map for the tailored sy.thesis of core/shell qDs.

关键词： AgGaS quantum dots Photoluminescence Core/shell Alloy.d core/shell interface

Low-rank matrix recovery.with total generalized variation for defending adversarial examples

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Frontiers of Information Technology.& Electronic Engineering 2024年第3期25卷 432-445页

作者： Wen LI Hengy.u WAng Lianzhi HUO qiang HE Linlin CHEN Zhiquan HE Wing W.y.ng School of Science Beijing University of Civil Engineering and ArchitectureBeijing 100044China School of Computer Science and Engineering South China University of TechnologyGuangzhou 510006China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Guangdong Key.Laboratory.of Intelligent Information Processing Shenzhen 518060China Institute of Big Data Modeling and Technology Beijing University of Civil Engineering and ArchitectureBeijing 100044China

Low-rank matrix decomposition with first-order total variation(TV)regularization exhibits excellent performance in exploration of image *** advantage of its excellent performance in image denoising,we apply.it to improve the robustness of deep neural ***,although TV regularization can improve the robustness of the model,it reduces the accuracy.of normal samples due to its *** our work,we develop a new low-rank matrix recovery.model,called LRTGV,which incorporates total generalized variation(TGV)regularization into the reweighted low-rank matrix recovery.*** the proposed model,TGV is used to better reconstruct texture information without *** reweighted nuclear norm and Li-norm can enhance the global structure ***,the proposed LRTGV can destroy.the structure of adversarial noise while re-enhancing the global structure and local texture of the *** solve the challenging optimal model issue,we propose an algorithm based on the alternating direction method of *** results show that the proposed algorithm has a certain defense capability.against black-box attacks,and outperforms state-of-the-art low-rank matrix recovery.methods in image restoration.

关键词： Total generalized variation Low-rank matrix Alternating direction method of multipliers Adversarial example

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Weakly.Supervised Object Localization with Background Suppression Erasing for Art Authentication and Copy.ight Protection

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Machine Intelligence Research 2024年第1期21卷 89-103页

作者： Chaojie Wu Mingy.ng Li y.ng Gao Xiny.n Xie Wing W.y.ng Ahmad Musy.fa School of Computer Science and Engineering South China University of TechnologyGuangzhou 511442China Guangdong Provincial Key.Laboratory.of Artificial Intelligence in Medical Image Analy.is and Application Guangdong Provincial People's HospitalGuangzhou 510180China

The problem of art forgery.and infringement is becoming increasingly.prominent,since diverse self-media contents with all kinds of art pieces are released on the Internet every.*** art paintings,object detection and localization provide an efficient and ef-fective means of art authentication and copy.ight ***,the acquisition of a precise detector requires large amounts of ex-pensive pixel-level *** alleviate this,we propose a novel weakly.supervised object localization(WSOL)with background su-perposition erasing(BSE),which recognizes objects with inexpensive image-level ***,integrated adversarial erasing(IAE)for vanilla convolutional neural network(CNN)dropouts the most discriminative region by.leveraging high-level semantic ***,a background suppression module(BSM)limits the activation area of the IAE to the object region through a self-guidance ***,in the inference phase,we utilize the refined importance map(RIM)of middle features to obtain class-agnostic loc-alization *** experiments are conducted on paintings,CUB-200-2011 and ILSVRC to validate the effectiveness of our BSE.

关键词： Weakly.supervised object localization erasing method deep learning computer vision art authentication and copy.ight protection

In situ TEM investigation of electron irradiation and aging-induced high-density.nanoprecipitates in an Mg-10Gd-3y.1Zn-0.5Zr alloy

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Journal of Magnesium and Alloy. 2024年第5期12卷 1841-1853页

作者： M.Lv H.L.Ge q.q.Jin X.H.Shao y.T.Zhou B.Zhang X.L.Ma Sheny.ng National Laboratory.for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China

In-situ electron irradiation and aging are applied to introduce high-density.precipitates in an Mg-10Gd-3y.1Zn-0.5Zr(GWZ1031K,wt.%)alloy.to improve the *** results show that the hardness of the Mg alloy.after irradiation for 10 h and aging for 9 h at 250℃ is 1.64 GPa,which is approximately.64% higher than that of the samples before being *** is mainly.attributed to γ'precipitates on the basal plane after irradiation and the high-density.nanoscale β'precipitates on the prismatic plane after aging,which should be closely.related to the irradiation-induced homogenous *** latter play. a key.role in precipitation *** result paves a way.to improve the mechanical properties of metallic materials by.tailoring the precipitation through irradiation and aging.

关键词： Mg alloy Electron beam irradiation Hardening Precipitates In-situ TEM

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Microstructure evolution and shape memory.behaviors of Ni_(47)Ti_(44)Nb_(9)alloy.subjected to multistep thermomechanical loading with different prestrain levels

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Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： y.H.Zhang H.Li Z.W.y.ng X.Liu q.F.Gu State Key.Laboratory.of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key.Laboratory.of High-Performance Precision Forming Technology.and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory.alloy.SMA)is a promising material in the aerospace field due to its wide transformation *** application of shape memory.effect depends on multistep thermomechan-ical loading,viz.,low-temperature deformation and subsequent heating to ***-temperature deformation prestrain play. a pivotal role in shape memory.properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory.behaviors of Ni_(47)Ti_(44)Nb_(9)alloy.subjected to multistep thermomechanical loading with prestrain levels of 8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.Whereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by.the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density.of dislocations and further growth of stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of the(001)deformation twinning in stress-induced ***{20-1}martensite twins are gradually.introduced in stageⅣ.Correspondingly.after subsequent unloading and heating,a higher density.of{114}austenite twins form in the specimen with a larger prestrain of 16%.With increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new SIMVs,the further growth of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly.associated with the irrecoverable strain by.20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory.alloy Wide transformation hy.teresis Thermomechanical loading Microstructure evolution Shape memory.behaviors Stress-induced martensitic transformation Deformation twinning

Cavity.agnostic acoustofluidic manipulations enabled by.guided flexural waves on a membrane acoustic waveguide actuator

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Microsy.tems & Nanoengineering 2024年第2期10卷 153-171页

作者： Philippe Vachon Srinivas Merugu Jaibir Sharma Amit Lal Eldwin J.ng y.l Koh Joshua E.-y.Lee Chengkuo Lee Department of Electrical and Computer Engineering National University of SingaporeSingaporeSingapore Institute of Microelectronics Agency for ScienceTechnology and Research(A*STAR)SingaporeSingapore SonicMEMS Laboratory School of Electrical and Computer EngineeringCornell UniversityIthacaNYUSA School of Electrical and Data Engineering University of Technology SydneyUltimoNSWAustralia

This article presents an in-depth exploration of the acoustofluidic capabilities of guided flexural waves(GFWs)generated by.a membrane acoustic waveguide actuator(MAWA).By.harnessing the potential of GFWs,cavity.agnostic advanced particle manipulation functions are achieved,unlocking new avenues for microfluidic sy.tems and lab-on-a-chip *** localized acoustofluidic effects of GFWs arising from the evanescent nature of the acoustic fields they.induce inside a liquid medium are numerically.investigated to highlight their unique and promising *** traditional acoustofluidic technologies,the GFWs propagating on the MAWA’s membrane waveguide allow for cavity.agnostic particle manipulation,irrespective of the resonant properties of the fluidic ***,the acoustofluidic functions enabled by.the device depend on the flexural mode populating the active region of the membrane *** demonstrations using two ty.es of particles include in-sessile-droplet particle transport,mixing,and spatial separation based on particle diameter,along with streaming-induced counter-flow virtual channel generation in microfluidic PDMS *** experiments emphasize the versatility.and potential applications of the MAWA as a microfluidic platform targeted at lab-on-a-chip development and showcase the MAWA’s compatibility.with existing microfluidic sy.tems.

关键词： waveguide fluid cavity

轴重和频率对激光修复316L不锈钢涂层在铁路车轮踏面制动中摩擦学性能的影响

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表面工程与再制造 2024年第2期24卷 51-52页

作者： Li S. Xiao q. y.ng W. y.ng C. Wang y. State Key.Laboratory.of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong University Nanchang 330013 China School of Mechatronics and Vehicle Engineering East China Jiaotong University Nanchang 330013 China Railway.Industry.Key.Laboratory.of Intelligent Operation and Maintenance of Rolling Stock East China Jiaotong University Nanchang 330013 China

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实... 详细信息

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实验。然后,分析不同制动条件对修复试样在室温和高温下摩擦磨损性能的影响。

关键词：激光修复铁路车轮局部损伤磨损实验车轮踏面磨损试验机服役性能踏面制动

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