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Evaluation of the effects of EPS composite soil replacement on the dynamic performance of caisson structure using shaking table tests

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 829-843页

作者： gao Hongmei Ji Zhanpeng zhang Xinlei zhang Shushan wang Zhihua Shen guangming Research Center of Urban Underground Space Nanjing Tech UniversityNanjing 211816China Institute of geotechnical Engineering Nanjing Tech UniversityNanjing 211816China

The seismic performance of a caisson structure under two types of models with a saturated sandy foundation(CSS)and an expanded polystyrene(EPS)composite soil foundation(CES)are studied using shaking table *** macro phenomena of the two different foundation models are described and *** effects of the replacement of EPS composite soil on seismic-induced liquefaction of backfill and the dynamic performance of a caisson structure are evaluated in *** results show that the excess pore water pressure generation in the CES is significantly slower than that in the CSS during the *** dynamic earth pressure acting on the caisson has a triangular *** response of horizontal acceleration,displacement,settlement,and rotation angle of the caisson in the CES is smaller than that in the CSS,which means the caisson in the CES has a better seismic ***,the out-of-phase phenomenon between dynamic earth thrust and inertial force in the CES is more obvious than that in the CSS,which is beneficial to reduce the lateral force and improve the stability of the caisson structure.

关键词： EPS composite soil foundation Caisson-type quay wall shaking table test phase difference rotation angle

Highly dispersible cerium-oxide modified Ni/SBA-15 for steam reforming of bio-mass based JP10

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Chinese Journal of Chemical Engineering 2022年第3期35卷 255-265页

作者： Haocui zhang Zhourong Xiao Mei Yang Jijun Zou guozhu Liu Xiangwen zhang Key Laboratory for green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Microchemical Engineering and Technology group Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Ni/SBA-15 modified by highly dispersed cerium-oxide was prepared with the aid of sucrose for steam reforming of JP10(C_(10)H(16)).Their characterization showed that addition of appropriate amount ceria led to the formation of highly dispersed CeO_(2)and Ni,and the CeO_(2)covered smaller nickel particles like strawberry seeds to form much more interface between *** catalytic activity exhibited higher stability over time on stream of 6.5 h with conversion higher than 95%and higher carbon resistance(mass loss less than 4.5%by Tg),which may derive from good properties below:(1)much more interface enhanced cooperation effect and increased turnover frequency at the interface;(2)the stronger interaction between Ni and ceria to suppress sintering by formation of Ni-O-Ce solid solution;(3)the large amount of oxygen vacancies from the formation of Ni-O-Ce solid solution and highly dispersed CeO_(2)to facilitate the water-gas-shift reaction and carbon removal.

关键词： JP-10 Steam reforming Ceria Nickel Ni-CeO_(2)cooperation

Spatial transcriptomics reveals that metabolic characteristics define the tumor immunosuppression microenvironment via iCAF transformation in oral squamous cell carcinoma

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International Journal of Oral Science 2024年第1期16卷 110-121页

作者： Zheqi Liu Zhen zhang Yu zhang wenkai Zhou Xu zhang Canbang Peng Tong Ji Xin Zou Zhiyuan zhang Zhenhu Ren Department of Oral and Maxillofacial-Head and Neck Oncology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology&Shanghai Research Institute of StomatologyShanghaiChina Department of Oral and Maxillofacial Surgery Zhongshan HospitalFudan UniversityShanghaiChina School and Hospital of Stomatology Kunming Medical UniversityKunmingChina Center for Tumor Diagnosis&Therapy Jinshan HospitalFudan UniversityShanghaiChina Department of Pathology Jinshan HospitalFudan UniversityShanghaiChina Hainan western Central Hospital Academician Zhang Zhiyuan Team Innovation CenterDanzhouChina

Tumor progression is closely related to tumor tissue metabolism and reshaping of the microenvironment. Oral squamous cell carcinoma (OSCC), a representative hypoxic tumor, has a heterogeneous internal metabolic environment. To clarify the relationship between different metabolic regions and the tumor immune microenvironment (TME) in OSCC, Single cell (SC) and spatial transcriptomics (ST) sequencing of OSCC tissues were performed. The proportion of TME in the ST data was obtained through SPOTlight deconvolution using SC and gSE103322 data. The metabolic activity of each spot was calculated using scMetabolism,and k-means clustering was used to classify all spots into hyper-, normal-, or hypometabolic regions. CD4T cell infiltration and TgF-βexpression is higher in the hypermetabolic regions than in the others. Through CellPhoneDB and NicheNet cell-cell communication analysis, it was found that in the hypermetabolic region, fibroblasts can utilize the lactate produced by glycolysis of epithelial cells to transform into inflammatory cancer-associated fibroblasts (iCAFs), and the increased expression of HIF1A in iCAFs promotes the transcriptional expression of CXCL12. The secretion of CXCL12 recruits regulatory T cells (Tregs), leading to Treg infiltration and increased TgF-β secretion in the microenvironment and promotes the formation of a tumor immunosuppressive microenvironment. This study delineates the coordinate work axis of epithelial cells-iCAFs-Tregs in OSCC using SC, ST and TCgA bulk data, and highlights potential targets for therapy.

关键词： CXCL12 microenvironment squamous

High-performance Zn-graphite battery based on LiPF6 single-salt electrolyte with high working voltage and long cycling life

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Journal of Energy Chemistry 2021年第7期30卷 602-609页

作者： Yong wang Luojiang zhang Fan zhang Xuan Ding Kyungsoo Shin Yongbing Tang Functional Thin Films Research Center Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Advanced Materials Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina

Zinc-ion batteries(ZIBs) are promising alternative energy storage devices to lithium-ion batteries owing to the merits of large abundance,high theoretical capacity,and environmental ***,critical challenges including low working voltage(below 2 V),low energy density as well as dendrites formation during long cycling caused by aqueous ZIB systems still hinder their practical ***,a high-voltage Zn-graphite battery(ZgB) based on a non-zinc ion single-salt electrolyte(2.5 M LiPF6 in carbonate solvent) is ***,we surprisingly found that Zn^(2+) is dissolved in the LiPF6 single-salt electrolyte during resting and discharging processes,thus enabling reversible Zn plating/stripping mechanism on the Zn foil anode in the ZgB over the voltage window of 1.0-3.1 *** a result,the ZgB achieves long-term cycling performance with a capacity retention of ~100% for over1200 cycles at 3 C and high Coulombic efficiency of ~100% in 1.0-3.1 V with no dendrites ***,the ZgB exhibits a high working voltage of up to 2.2 V,thus contributing to both high energy density(up to 210 wh kg^(-1)) and high power density(up to 1013 w kg^(-1)),superior than most reported ZIBs.

关键词： Zinc-ion battery Zn anode graphite cathode LiPF6 single-salt electrolyte High voltage

Multiplicity of thermodynamic states of van der waals gas in nanobubbles

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Chinese Journal of Chemical Engineering 2021年第3期34卷 26-32页

作者： Xu Tang Hongguang zhang Zhenjiang guo Xianren zhang Jing Li Dapeng Cao State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

The gas-containing nanobubbles have attracted extensive attention due to their remarkable properties and extensive application ***,a number of fundamental aspects of nanobubbles,including thermodynamic states for the confined gas,remain still *** we theoretically demonstrate that the van der waals(vd w)gases confined in nanobubbles exhibit a unique thermodynamic state of remarkably deviating from the bulk gas phase,and the state transition behavior due to the sizedependent Laplace *** general,the vd w gas inside nanobubbles present multiple stable or transient states,where 0–2 states are for supercritical gas and 0–4 for subcritical *** further analysis based on Rayleigh–Plesset equation and free energy determination indicates that the gas states in nanobubbles exhibits different levels of stability,from which the coexistence of multiple bubble states and microphase equilibrium between droplets and bubbles are *** work provides insight to understand the thermodynamic states appeared for gas in nanobubbles.

关键词： Nanobubbles Stability Thermodynamics Kinetics

Prediction of spatial distribution of the composition of inclusions on the entire cross section of a linepipe steel continuous casting slab

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Journal of Materials Science & Technology 2021年第2期61卷 147-158页

作者： Qiang Ren Yuexin zhang Ying Ren Lifeng zhang Jujin wang Yadong wang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al_(2)O_(3)-CaO inclusions reacted with the bulk steel and transformed to CaS-Al_(2)O_(3)-MgO-(CaO) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly CaS-Al_(2)O_(3)-MgO-(CaO) in slab center and were MgO-Al_(2)O_(3)-CaO-CaS within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.

关键词： Inclusions Linepipe steel Continuous casting slab Mass transfer Thermodynamics Kinetics

Investigation of magnetic inhibition effect on ion acceleration at high laser intensities

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Matter and Radiation at Extremes 2021年第4期6卷 1-9页

作者： H.Huang Z.M.zhang B.zhang w.Hong S.K.He L.B.Meng w.Qi B.Cui w.M.Zhoua Science and Technology on Plasma Physics Laboratory Mianyang 621900China

The irradiation of a target with high laser intensity can lead to self-generation of an intense magnetic field(B-field)on the target *** has therefore been suggested that the sheath-driven acceleration of high-energy protons would be significantly hampered by the magnetization effect of this self-generated B-field at high enough laser *** this paper,particle-in-cell simulations are used to study this magnetization effect on sheath-driven proton *** is shown that the inhibitory effect of the B-field on ion acceleration is not as significant as previously ***,it is shown that the magnetization effect plays a relatively limited role in high-energy proton acceleration,even at high laser intensities when the mutual coupling and competition between self-generated electric(E-)and B-fields are considered in a realistic sheath acceleration scenario.A theoretical model including the v 3 B force is presented and confirms that the rate of reduction in proton energy depends on the strength ratio between B-and E-fields rather than on the strength of the B-field alone,and that only a small percentage of the proton energy is affected by the self-generated ***,it is shown that the degraded scaling of proton energy at high laser intensities can be explained by the decrease in acceleration time caused by the increased sheath fields at high laser intensities rather than by the magnetic inhibitory effect,because of the longer growth time scale of the *** understanding of the magnetization effect may pave the way to the generation of high-energy protons by sheath-driven acceleration at high laser intensities.

关键词： field. acceleration effect

XMAM:X-raying models with a matrix to reveal backdoor attacks for federated learning

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Digital Communications and Networks 2024年第4期10卷 1154-1167页

作者： Jianyi zhang Fangjiao zhang Qichao Jin Zhiqiang wang Xiaodong Lin Xiali Hei Beijing Electronic Science and Technology Institute Beijing100070China University of guelph OntarioN1G 2W1Canada University of Louisiana at Lafayette Louisiana70503USA

Federated Learning(FL),a burgeoning technology,has received increasing attention due to its privacy protection ***,the base algorithm FedAvg is vulnerable when it suffers from so-called backdoor *** researchers proposed several robust aggregation ***,due to the hidden characteristic of backdoor attacks,many of these aggregation methods are unable to defend against backdoor ***'s more,the attackers recently have proposed some hiding methods that further improve backdoor attacks'stealthiness,making all the existing robust aggregation methods *** tackle the threat of backdoor attacks,we propose a new aggregation method,X-raying Models with A Matrix(XMAM),to reveal the malicious local model updates submitted by the backdoor *** we observe that the output of the Softmax layer exhibits distinguishable patterns between malicious and benign updates,unlike the existing aggregation algorithms,we focus on the Softmax layer's output in which the backdoor attackers are difficult to hide their malicious ***,like medical X-ray examinations,we investigate the collected local model updates by using a matrix as an input to get their Softmax layer's ***,we preclude updates whose outputs are abnormal by *** any training dataset in the server,the extensive evaluations show that our XMAM can effectively distinguish malicious local model updates from benign *** instance,when other methods fail to defend against the backdoor attacks at no more than 20%malicious clients,our method can tolerate 45%malicious clients in the black-box mode and about 30%in Projected gradient Descent(PgD)***,under adaptive attacks,the results demonstrate that XMAM can still complete the global model training task even when there are 40%malicious ***,we analyze our method's screening complexity and compare the real screening time with other *** results show that XMAM is a

关键词： Federated learning Backdoor attacks Aggregation methods

generative adversarial networks enhanced location privacy in 5g networks

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Science China(Information Sciences) 2020年第12期63卷 41-52页

作者： Youyang QU Jingwen zhang Ruidong LI Xiaoning zhang Xuemeng ZHAI Shui YU School of Information Technology Deakin University School of Computer Science University of Technology Sydney National Institute of Information and Communications Technology (NICT) School of Information and Communication Engineering University of Electronic Science and Technology of China Center of AI and Big Data Southeast Digital Economic Development Institute

5g networks, as the up-to-date communication platforms, are experiencing fast booming. Meanwhile, increasing volumes of sensitive data, especially location information, are being generated and shared using 5g networks for various purposes ceaselessly. Location and trajectory information in the published data has always been and will keep courting risks and attacks by malicious adversaries. Therefore, there are still privacy leakage threats by simply sharing the original data, especially data with location information, due to the short cover range of 5g signal tower. To better address these issues, we proposed a generative adversarial networks(gAN) enhanced location privacy protection model to cloak the location and even trajectory information. we use posterior sampling to generate a subset of data, which is proved complying with differential privacy requirements from the end device side. After that, a data augmentation algorithm modified from classic gAN is devised to generate a series of privacy-preserving full-sized synthetic data from the central server side. with the synthetic data generated from a real-world dataset, we demonstrate the superiority of the proposed model in terms of location privacy protection, data utility, and prediction accuracy.

关键词： 5g privacy preservation generative adversarial nets differential privacy