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On-demand engineerable visible spectrum by fine control of electrochemical reactions

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National Science Review 2024年第3期11卷 239-249页

作者： Qirong liu Lei liu Yongping Zheng Min Li Baofu Ding Xungang Diao Hui-Ming Cheng Yongbing tang Advanced Energy Storage technology Research Center Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences Institute of technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences School of Energy and Power Engineering North University of China School of Resource Environment and Safety EngineeringHunan University of Science and Technology School of Energy and Power Engineering Beihang University Shenzhen Key Laboratory of Energy Materials for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

tunability of optical performance is one of the key technologies for adaptive optoelectronic applications,such as camouflage clothing, displays, and infrared shielding. High-precision spectral tunability is of great importance for some special applications with on-demand adaptability but remains challenging. Here we demonstrate a galvanostatic control strategy to achieve this goal, relying on the finding of the quantitative correlation between optical properties and electrochemical reactions within materials. An electrochromic electro-optical efficiency index is established to optically fingerprint and precisely identify electrochemical redox reactions in the electrochromic device. Consequently, the charge-transfer process during galvanostatic electrochemical reaction can be quantitatively regulated, permitting precise control over the final optical performance and on-demand adaptability of electrochromic devices as evidenced by an ultralow deviation of these findings not only provide opportunities for future adaptive optoelectronic applications with strict demand on precise spectral tunability but also will promote in situ quantitative research in a wide range of spectroelectrochemistry, electrochemical energy storage, electrocatalysis, and material chemistry.

关键词： electrochromics fine control spectral tunability high precision galvanostatic control

PREDICtION OF FLOW StRESS OF HIGH-SPEED StEEL DURING HOt DEFORMAtION BY USING BP ARtIFICIAL NEURAL NEtWORK

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Acta Metallurgica Sinica(English Letters) 2000年第1期13卷 394-400页

作者： J. t. liu H.B. Chang R.H. Wu t. Y. Hsu(Xu Zuyao) and X.R. Ruan( 1)Department of Plasticity technology, Shanghai Jiao tong University, Shanghai 200030, China 2)School of Materials Science and Engineering, Shanghai Jiao tong University, Shanghai 200030,

the hot deformation behavior of tI (18W-4Cr-1V) high-speed steel was investigated by means of continuous compression tests performed on Gleeble 1500 thermomechan- ical simulator in a wide range of tempemtures (950℃-1150℃) with strain rotes of 0.001s-1-10s-1 and true strains of 0-0. 7. the flow stress at the above hot defor- mation conditions is predicted by using BP artificial neural network. the architecture of network includes there are three input parameters:strain rate,temperature t and true strain , and just one output parameter, the flow stress ,2 hidden layers are adopted, the first hidden layer includes 9 neurons and second 10 negroes. It has been verified that BP artificial neural network with 3-9-10-1 architecture can predict flow stress of high-speed steel during hot deformation very well. Compared with the prediction method of flow stress by using Zaped-Holloman parumeter and hyperbolic sine stress function, the prediction method by using BP artificial neurul network has higher efficiency and accuracy.

关键词： t1 high-speed steel flow stress prediction of flow stress back propagation (BP) artificial neural network (ANN)

Effects of nano-metal oxide additives on ignition and combustion properties of MICs-boron rich fuels

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DEFENCE tECHNOLOGY 2024年第9期39卷 157-167页

作者： Hu, Liang liu, Danyang Yang, Kun Lu, Jianying Shi, Chao Wang, Jianyu liu, Xinhang Chen, Lang Beijing Inst technol State Key Lab Explos Sci & Safety Protect Beijing 100081 Peoples R China

Boron has been considered a promising powdered metal fuel for enhancing composite propellants' energy output due to its high energy density. However, the high ignition temperature and low combustion efficiency limit the application of boron powder due to the high boiling point of the boron oxide layer. Much research is ongoing to overcome these shortcomings, and one potential approach is to introduce a small quantity of metal oxide additives to promote the reaction of boron. this study prepared boron-rich fuels with 10 wt% of eight nano-metal oxide additives by mechanical ball milling. the effect of metal oxides on the thermo-oxidation, ignition, and combustion properties of boron powder was comprehensively studied by the thermogravimetric analysis (tG), the electrically heated filament setup (t-jump), and the laser-induced combustion experiments. tG experiments at 5 K/min found that Bi2O3, MoO3, tiO2, Fe2O3, and CuO can promote thermo-oxidation of boron. Compared to pure boron, t-onset can be reduced from 569 degrees C to a minimum of 449 degrees C (B/Bi2O3). Infrared temperature measurement in t-jump tests showed that when heated by an electric heating wire at rates from 1000 K/s to 25000 K/s, the ignition temperatures of B/Bi2O3 are the lowest, even lower than the melting point of boron oxide. Ignition images and SEM for the products further showed that the high heating rate is beneficial to the rapid reaction of boron powder in the single-particle combustion state. Fuels (B/Bi2O3, B/MoO3, and B/CuO) were mixed with the oxidant AP and ignited by laser to study the combustion performance. the results showed that B/CuO/AP has the largest flame area, the highest BO2 characteristic spectral intensity, and the largest burn rate for powder lines. to combine the advantages of CuO and Bi2O3, binary metal oxide (CBO, mass ratio of 3:1) was prepared and the test results showed that CBO can very well improve both ignition and combustion properties of boron. Especially B/CBO

关键词： Boron-rich fuel Mechanical ball milling Electrically heated filament Laser-induced combustion PARtICLES MODEL

A Correlation-Based Stochastic Model for Massive MIMO Channel

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China Communications 2024年第1期21卷 175-187页

作者： Yang liu Gang Li Chengxiang Wang National Mobile Communications Research Laboratory School of Information Science and EngineeringSoutheast UniversityNanjing 211189China School of Internet of things Engineering Jiangnan UniversityWuxi 214122China Pervasive Communication Research Center Purple Mountain LaboratoriesNanjing 211111China

In this paper,the channel impulse response matrix(CIRM)can be expressed as a sum of couplings between the steering vectors at the base station(BS)and the eigenbases at the mobile station(MS).Nakagami distribution was used to describe the fading of the coupling between the steering vectors and the *** measurements were carried out to evaluate the performance of this proposed ***,the physical implications of this model were illustrated and the capacities are *** addition,the azimuthal power spectrum(APS)of several models was ***,the channel hardening effect was simulated and *** showed that the proposed model provides a better fit to the measured results than the other CBSM,i.e.,Weichselberger ***,the proposed model can provide better tradeoff between accuracy and complexity in channel *** CIRM model can be used for massive MIMO design in the future communication system design.

关键词： CBSM channel capacity channel hardening channel modeling massive MIMO

Enhanced population of excited single state strategy:Irradiation and ultrasound dual-response and host tumor-driven nanosensitizers construction in triple synergistic therapy

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Nano Research 2024年第6期17卷 5501-5511页

作者： Yaning Li Mengyan tian tianyue Yang Jiayu Cao Hongli Chen Jun Guo Pai liu Yi liu State Key Laboratory of Separation Membranes and Membrane Processes School of Materials Science and EngineeringTiangong UniversityTianjin 300387China State Key Laboratory of Separation Membranes and Membrane Processes School of ChemistryTiangong UniversityTianjin 300387China State Key Laboratory of Separation Membranes and Membrane Processes School of Life ScienceTiangong UniversityTianjin 300387China State Key Laboratory of Separation Membrane and Membrane Process&tianjin Key Laboratory of Green Chemical technology and Process Engineering School of ChemistryTiangong UniversityTianjin 300387China School of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China Cangzhou Institute of tiangong University Cangzhou 061000China

Phototheranostics is an emerging field in synergistic antitumor therapy in which irradiation and sensitizers are combined to produce reactive oxygen species(ROS),bio-images,and high *** of these are arrived from the energy of sensitizers,which located in excited single state(S_(1)).Undeniably,the decentralization of the S_(1)population indirectly decreases the effect of each individual *** this study,a strategy was proposed for enhancing the S_(1)population,and a sensitizer with mitochondrial targeting property,1,4-indolyl iodinated pyrrolo[3,2-b]pyrrole derivative(2I-tPIS),was assembled into adenosine triphosphate(AtP)-responsive nanoparticles(DPA-2I NPs)to achieve dual responses to irradiation and ultrasonication(US)for application to photo-sonodynamic therapy(PSDt).Compared with monotherapies,2I-tPIS generated more ROS in PSDt,inducing mitochondrial autophagy and apoptosis,which in turn triggered immunogenic cell death(ICD).Subsequently,DPA-2I NPs were constructed and self-assembled with the chemotherapeutic agents DPA-Cd and 2I-tPIS to achieve a triple synergistic strategy involving chemotherapy(Ct)and ***-2I NPs exhibited absolute sensitization,intra-tumoral overexpression of AtP,and ***,the biosafety and potent antitumor efficiency of the DPA-2I NP-based“PSDt+Ct”therapy were revealed using a 4t1 tumor *** study results provide insights into the design of sensitizers possessing a sufficient S_(1)population and a highly efficient tumor ablation capacity derived from molecular structural modulation,further enabling triple synergistic antitumor therapies,and expanding the clinical application of sensitizers.

关键词： triphosphate(AtP)-activated nano-sensitizers photo-sonodynamic therapy aggregation-induced emission enhanced excited state population

Distributed order estimation for continuous-time stochastic systems

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Control theory and technology 2024年第3期22卷 406-418页

作者： Xinghua Zhu Zhixin liu Xiaoming Hu Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100190China Department of Mathematics KTH Royal Institute of TechnologyStockholm 10044Sweden

In this paper,we investigate the distributed estimation problem of continuous-time stochastic dynamic systems over sensor networks when both the system order and parameters are *** propose a local information criterion(LIC)based on the L_(0)penalty *** minimizing LIC at the diffusion time instant and utilizing the continuous-time diffusion least squares algorithm,we obtain a distributed estimation algorithm to simultaneously estimate the unknown order and the parameters of the *** dealing with the effect of the system noises and the coupling relationship between estimation of system orders and parameters,we establish the almost sure convergence results of the proposed distributed estimation ***,we give a simulation example to verify the effectiveness of the distributed algorithm in estimating the system order and parameters.

关键词： Stochastic differential equations Sensor networks Distributed order estimation Cooperative excitation condition.Convergence

BMP9 induces osteogenic differentiation through up-regulating LGR4 via the mtORC1/ Stat3 pathway in mesenchymal stem cells

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Genes & Diseases 2024年第3期11卷 468-483页

作者： Jie Zhang Jinhai Jiang Hang liu Shiyu Wang Kaixin Ke Siyuan liu Yue Jiang Lu liu Xiang Gao Baicheng He Yuxi Su Department of Pharmacology School of PharmacyChongqing Medical UniversityChongqing 400016China Key Laboratory of Biochemistry and Molecular Pharmacology of Chongqing Chongqing Medical UniversityChongqing 400016China Department of Orthopedics Second Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China orthopedics Department Children's Hospital of Chongqing Medical UniversityChongqing 400014China China International Science and technology Cooperation Base of Child Development and Critical Disorders Jiangxi Hospital Affiliated Children's Hospital of Chongqing Medical UniversityJiangxi 330000China National Clinical Research Center for Child Health and Disorders China

Bone defects and non-union are prevalent in clinical orthopedy,and the outcomes of current treatments are often *** tissue engineering offers a promising approach to treating these conditions *** morphogenetic protein 9(BMP9)can commit mesenchymal stem cells to osteogenic lineage,and a knowledge of the underlying mechanisms may help advance the field of bone tissue ***-rich repeats con-taining G protein-coupled receptor 4(LGR4),a member of G protein-coupled receptors,is essential for modulating bone *** study is aimed at investigating the impact of LGR4 on BMP9-induced osteogenesis in mesenchymal stem cells as well as the underlying *** marrow stromal cells from BMp9-knockout mice exhibited diminished LGR4 expression,and exogenous LGR4 clearly restored the impaired osteogenic potency of the bone marrow stromal ***,LGR4 expression was increased by BMP9 in C3H10t1/2 ***4 augmented the benefits of BMP9-induced osteogenic markers and bone formation,whereas LGR4 inhibition restricted these ***,the BMP9-induced li-pogenic markers were increased by LGR4 *** protein levels of Raptor and p-Stat3 were elevated by *** knockdown or p-Stat3 suppression attenuated the osteoblastic markers and LGR4 expression brought on by ***4 significantly reversed the blocking ef-fect of Raptor knockdown or p-Stat3 suppression on the BMP9-induced osteoblastic *** interacts with p-Stat3,and p-Stat3 activates the LGR4 promoter *** conclusion,LGR4 boosts BMP9 osteoblastic potency in mesenchymal stem cells,and BMP9 may up-regulate LGR4 via the mtORC1/Stat3 signal activation.

关键词： BMP9 LGR4 mtORC1 Osteogenic differentiation Stat3

NUMERICAL SIMULAtION OF CAStING PROCESS

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 764-769页

作者： L.L. Chen, R.X. liu and H.t. Lin College of Materials Science and Engineering, Huazhong University of Science and technology, Wuhan 430074, China

In this paper, the development status of casting numerical simulation technology is introduced. In additional, mathematical model, solution method, initial condition, boundary condition and defect predicting scheme of foundry process are also analyzed, which include the mold filling process, solidification process and the process coupling fluid flow with heat transfer. Finally, a practical casting is taken out to show how to predict defects and optimize foundry process with numerical simulation technology.

关键词： foundry numerical simulation temperature field fluid field coupling fluid flow with heat transfer

Fe的化学计量比对金属间化合物Ni_3Fe环境氢脆的影响

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上海大学学报（自然科学版） 2010年第4期16卷 429-435页

作者：钱海燕陈涛陈业新 C.t.liu 上海大学材料研究所上海200072 田纳西大学材料科学与工程系美国tn379962200

研究不同Fe化学计量比的无序态、有序态金属间化合物Ni3Fe合金在真空和氢气环境中拉伸的力学性能和断口形貌.结果表明,当Ni3Fe合金的成分偏离化学计量比时,合金的相组成不发生变化,但合金的力学性能和在氢气环境中的氢脆敏感性却随之发... 详细信息

研究不同Fe化学计量比的无序态、有序态金属间化合物Ni3Fe合金在真空和氢气环境中拉伸的力学性能和断口形貌.结果表明,当Ni3Fe合金的成分偏离化学计量比时,合金的相组成不发生变化,但合金的力学性能和在氢气环境中的氢脆敏感性却随之发生变化.非化学计量的Ni3Fe合金在真空和氢气中的塑性增加,氢脆因子(IH2)降低.不同Fe化学计量比的有序态Ni3Fe合金氢脆敏感性的差异与合金的有序度有关,化学计量的Ni3Fe合金有序度最高,环境氢脆敏感性也最高;非化学计量的Ni3Fe合金有序度降低,环境氢脆敏感性也随之降低.

关键词： Ni3Fe金属间化合物环境氢脆断口形貌化学计量比有序度