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Effect of as-solidified microstructure on subsequent solution-treatment process for A356 Al alloy

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Transactions of Nonferrous Metals Society of China 2016年第3期26卷 634-642页

作者：党波刘丛丛刘峰刘颖卓李远兵西北工业大学凝固技术国家重点实验室西安710072

For the compromise of mechanical properties and product cost, the end-chilled sand casting technique was applied to studying the microstructure evolution of A356 Al alloy with cooling rate and the effect of different as-cast microstructures on the subsequent solution-treatment process. The experimental results show that the secondary dendrite arm spacing (SDAS) of primaryα(Al), the size of eutectic Si and the volume fraction of Al?Si eutectic are reduced with increasing the cooling rate. Eutectic Si, subjected to solution treatment at 540 °C for 1 h followed by water quenching to room temperature, is completely spheroidized at cooling rate of 2.6 K/s; is partially spheroidized atcooling rate of 0.6 K/s; and is only edge-rounded at cooling rates of 0.22 and 0.12 K /s. Whilst the microhardness is also the maximum at cooling rate of 2.6 K/s. It consequently suggests that subjected to modification by high cooling rate, the eutectic Si is more readily modified, thus shortening the necessary solution time at given solution temperature, i.e., reducing the product cost.

关键词： A356 Al alloy solution heat treatment cooling rate eutectic silicon modification

基于适配体的功能化纳米探针在食品安全检测中的应用进展

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食品工业科技 2018年第10期39卷 335-341页

作者：周迎卓王欣刘宝林上海理工大学医疗器械与食品学院上海200093

高灵敏度及特异性的检测方法是保障食品安全的关键。基于适配体的功能化纳米探针为食品危害因子的检测提供了一种新型、高效的分析手段。本文基于适配体的4类纳米传感器:光学、磁弛豫、电化学和其他类型的检测原理,重点论述了适配体的... 详细信息

高灵敏度及特异性的检测方法是保障食品安全的关键。基于适配体的功能化纳米探针为食品危害因子的检测提供了一种新型、高效的分析手段。本文基于适配体的4类纳米传感器:光学、磁弛豫、电化学和其他类型的检测原理,重点论述了适配体的功能化纳米探针在食品安全因子检测方面的应用进展,包括农药、兽药及其残留物,致病微生物,真菌毒素,真金毒素,重金属,生物酶等,并对该方法的发展趋势进行了展望。开发简便、易携带的生物传感器,在纳米粒子上修饰多种适配体以实现对多种危害因子的同时检测,以及开发快速、有效、简单的样品前处理方法,有效避免背景干扰,提高方法的灵敏度和降低检测限,是未来的快速检测的发展方向。

关键词：适配体纳米粒子食品危害因子检测

Persistent inflammation induce lipid metabolism disorder in rats and the effects of Panax Notoginseng Saponins

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Persistent inflammation induce lipid metabolism disorder in ...

Flexible molecules dedicate to release strain of inverted inorganic perovskite solar cell

中国药理学会第十一次全国学术会议

作者： JIA Yi,LI zhuo-ying,liu Ya,TNAG Yuan,LI Xiao-hui (Institute of Material Medica,College of Pharmacy,Third Military Medical University,Chongqing 400038,China)

OBJECTIVE Epidemiological studies have shown the close correlation between the disorder of lipid metabolism and many severe diseases,including stroke,atherosclerosis,diabetes and so ***,disorder of serum lipid level occurred in patients with chronic inflammation disease,such as rheumatic arthritis and lupus *** study was designed to explore the action of persistent inflammation in lipid metabolism in vivo and in *** of Panax notoginseng saponins(PNS) were also observed in this ***①Animals were divided into four groups including hyper-fat diet group(high fat diet),inflammation group(high fat diet + zymosan,20 mg·kg,i.p.,once every 5 d),PDTC group(high fat diet + zymosan,20 mg·kg,i.p., once every 5 d + PDTC,100 mg·kg,i.p.,daily) and PNS group(high fat diet + zymosan,20 mg·kg,i.p.,once every 5 d + PNS 120 mg·kg,i.g.,daily).②To study the effect of persistent inflammation on lipid metabolism in normal rats,animals were divided into four groups including control group(normal diet),simple-inflammation group(normal diet + zymosan,20 mg·kg, i.p.,once every 5 d),PDTC group(normal diet + zymosan,20 mg·kg,i.p.,once every 5 d + PDTC,100 mg·kg,i.p.,daily) and PNS group(normal diet + zymosan,20 mg·kg,i.p.,once every 5 d + PNS 120 mg·kg,i.g.,daily).RESULTS①Persistent inflammation could induce and aggravate the lipid metabolism disorder in normal rats and hyper-fat diet rats respectively. Compared with control group and hyper-fat diet group,the serum TNF-α,TC,TG and LDL levels increased significantly,and the level of HDL decreased noticeably.②Persistent inflammation reduced the LPL activity,the expression of LPL(mRNA and protein) significantly.③In PDTC and PDTC therapy group,the levels of TNF-α,TC,TG and LDL were decreased and the HDL level,the expression of LPL(mRNA and protein),the activity of LPL were increased by comparison of that in inflammation group and simple-inflammation group respectively.④The treatment of PNS(i.g.) could improv

关键词： Inflammation Lipid metabolism Saponins of Panax Notoginseng

来源： cnki会议评论

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Journal of Energy Chemistry 2025年第1期100卷 87-93页

作者： Hongrui Sun Sanlong Wang Pengyang Wang Yali liu Shanshan Qi Biao Shi ying Zhao Xiaodan Zhang Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center State Key Laboratory of Photovoltaic Materials and CellsNankai University Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Haihe Laboratory of Sustainable Chemical Transformations Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)

The tensile strain in inorganic perovskite films induced by thermal annealing is one of the primary factors contributing to the inefficiency and instability of inorganic perovskite solar cells （IPSCs）,which reduces the defect formation ***,a flexible molecule 5-maleimidovaleric acid （5-MVA） was introduced as a strain buffer to release the residual strain of *** anhydride and carboxyl groups in 5-MVA interact strongly with the uncoordinated Pb2+through Lewis acid-base reaction,thus tightly“pull”the perovskite *** in-between soft carbon chain increased the structural flexibility of CsPbI2.85Br0.15perovskite materials,which effectively relieved the intrinsic internal strain of CsPbI2.85Br0.15,resisted the corrosion of external strain,and also reduced the formation of defects such as VIand *** addition,the introduction of 5-MVA improved crystal quality,passivated residual defects,and narrowed energy level ***,power conversion efficiency （PCE） of NiOxbased inverted IPSCs increased from 19.25% to 20.82% with the open-circuit voltage enhanced from 1.164 V to 1.230 *** release of strain also improved the stability of CsPbI2.85Br0.15perovskite films and devices.

关键词： Inverted inorganic perovskite solar cells Flexible molecules Strain release Crystallization Energy barrier High PCE

Observation of topological charge transformations in acoustic vortex using passive periodic systems

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 140-147页

作者： Di-Chao Chen Xie liu Changqing Xu Da-Jian Wu ying Cheng Xiao-Jun liu School of Physics and Technology Nanjing Normal University Key Laboratory of Modern Acoustics School of Physics Nanjing University

Vortex transmutation utilizes a periodic system, which not only enables the alteration of the topological charge(TC) of unstable input vortices but also facilitates their transformation into stable structures. This approach is crucial for investigating the characteristics of vortices in various wave systems. Here, we achieve acoustic vortex TC transmutation by employing a welldesigned dual-structured plate external system(DPES). The interactions between the acoustic vortex and the finite-order discrete rotational symmetry lead to the transformation of its topological charge when complete rotational symmetry is broken to Nthorder discrete symmetry. Our results experimentally demonstrate the acoustic vortex TC transmutation based on passive artificial structures, enabling numerous applications in particle manipulation and information multiplexing as well as advancing our understanding and control over free-space acoustic vortices.

关键词： acoustic vortex topological charge transformation artificial structure

NOX4 exacerbates Parkinson's disease pathology by promoting neuronal ferroptosis and neuroinflammation

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Neural Regeneration Research 2025年第7期20卷 2038-2052页

作者： Zhihao Lin Changzhou ying Xiaoli Si Naijia Xue Yi liu Ran Zheng ying Chen Jiali Pu Baorong Zhang Department of Neurology The Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiang ProvinceChina

Parkinson's disease is primarily caused by the loss of dopaminergic neurons in the substantia nigra ***,a novel form of regulated cell death characterized by iron accumulation and lipid peroxidation,plays a vital role in the death of dopaminergic ***,the molecular mechanisms underlying ferroptosis in dopaminergic neurons have not yet been completely *** oxidase 4 is related to oxidative stress,however,whether it regulates dopaminergic neuronal ferroptosis remains *** aim of this study was to determine whether NADPH oxidase 4 is involved in dopaminergic neuronal ferroptosis,and if so,by what *** found that the transcriptional regulator activating transcription factor 3 increased NADPH oxidase 4 expression in dopaminergic neurons and astrocytes in an 1-methyl-4-phenyl-1,2,3,6 tetrahydropyridine-induced Parkinson's disease *** oxidase 4 inhibition improved the behavioral impairments observed in the Parkinson's disease model animals and reduced the death of dopaminergic ***,NADPH oxidase 4 inhibition reduced lipid peroxidation and iron accumulation in the substantia nigra of the Parkinson's disease model ***,we found that NADPH oxidase 4 interacted with activated protein kinase Cαto prevent ferroptosis of dopaminergic ***,by lowering the astrocytic lipocalin-2 expression,NADPH oxidase 4 inhibition reduced 1-methyl-4-phenyl-1,2,3,6 tetrahydropyridine-induced *** findings demonstrate that NADPH oxidase 4 promotes ferroptosis of dopaminergic neurons and neuroinflammation,which contribute to dopaminergic neuron death,suggesting that NADPH oxidase 4 is a possible therapeutic target for Parkinson's disease.

关键词： dopaminergic neuron ferroptosis NADPH oxidase 4(NOX4) neuroinflammation Parkinson's disease

Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

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Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： Peng Zheng Wang Zhou ying Mo Biao Zheng Miaomiao Han Qin Zhong Wenwen Yang Peng Gao Lezhi Yang Jilei liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area Institute for Innovation Hunan University Changsha Research Institute of Mining & Metallurgy Co. LTD.

Hard carbon （HC） has been considered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectroscopy/electrochemical impedance spectroscopy （FTIR/EIS） and X-ray photoelectron spectroscopy （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping content exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectroscopy

Broadband and perfect terahertz absorber based on multilayer metamaterial with cross-ring patterned structures

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Optoelectronics Letters 2025年第1期21卷 1-6页

作者： WEN Jin liu Zhanzhi WU Zhengwei PAN Yu ZHANG ying School of Science Xi'an Shiyou University Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas Wells

Broadband and perfect terahertz absorber based on multilayer metamaterial using cross-ring patterned structures is proposed and investigated. The structure of the absorber is double absorption layers consisting of a chromium cross ring and eight isosceles right triangles. The unique structure of the double absorbing layers excites the electric dipole multimode resonance, giving rise to high absorption performance. Meanwhile, the influence of construal parameters on absorber behavior is also discussed. The numerical results show that the absorption achieves over 90% ranging from 2.45 THz to 6.25 THz and 99% absorption in the range of 3.7—5.3 THz. The realization of broadband and perfect absorber is described using the impedance matching principle. It is obviously found that the absorber is insensitive to the high angle of incidence for both transverse electric(TE) and transverse magnetic(TM) polarizations. Compared with the former reports, this absorber has remarkable improved absorption efficiency and smaller period. The terahertz absorber may be found applications in the fields of energy capture and thermal detection.

关键词： Metamaterials

Multiplicative forms on Poisson groupoids

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Science China Mathematics 2025年第1期 169-206页

作者： zhuo Chen Honglei Lang Zhangju liu Department of Mathematical Sciences Tsinghua University College of Science China Agricultural University School of Mathematics and Statistics Henan University

First,we prove a decomposition formula for any multiplicative differential form on a Lie groupoid ***,we prove that if G is a Poisson Lie groupoid,then the space ?mult·（G） of multiplicative forms on G has a differential graded Lie algebra（DGLA） ***,when combined with ?·（M）,which is the space of forms on the base manifold M of G,?mult·（G） forms a canonical DGLA crossed *** supplements a previously known fact that multiplicative multi-vector fields on G form a DGLA crossed module with the Schouten algebra Γ（∧·A） stemming from the Lie algebroid A of G.

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