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K_(0)试验确定土的卸载回弹参数辨析

地基处理 2024年第2期6卷 208-212页

作者：陈龙珠张思安上海交通大学船建学院土木工程系上海200240

基于固结压缩仪和三轴仪进行K_(0)试验测得的数据,本文假设土在卸载回弹过程中表现为非线性弹性,对卸载过程中土的静止侧压力系数与超固结比关系提出了一个适用性良好的拟合函数,并由此推导出土的卸载回弹静止侧压力系数和泊松比算式,... 详细信息

基于固结压缩仪和三轴仪进行K_(0)试验测得的数据,本文假设土在卸载回弹过程中表现为非线性弹性,对卸载过程中土的静止侧压力系数与超固结比关系提出了一个适用性良好的拟合函数,并由此推导出土的卸载回弹静止侧压力系数和泊松比算式,两者都会随着竖向应力的减小或超固结比的增大而增大;还推导出土的卸载回弹模量和变形模量的算式,它们都会随着竖向应力的减小和土的回弹指数的增加而减小,其中土的回弹变形模量的降低幅度因受回弹泊松比的影响而更为显著。本文对基坑开挖等卸载条件下地基土应力和变形计算的参数选取具有实用参考价值。

关键词：土的K_(0)试验卸载回弹静止侧压力系数泊松比回弹模量变形模量

Enhancing stationary entanglement between two optomechanical oscillators by Coulomb interaction with Kerr medium

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Chinese Physics B 2021年第12期30卷 406-412页

作者： Tian-Le Yang chen-long zhu Sheng Liu Ye-Jun Xu International Research Center of Quantum Information and Photoelectric Information School of Mechanical and Electronic EngineeringChizhou UniversityChizhou 247000China

We theoretically study the stationary entanglement of two charged nanomechanical oscillators coupling via Coulomb interaction in an optomechanical system with an additional Kerr *** show that the degree of entanglement between two nanomechanical oscillators is suppressed by Kerr interaction due to photon blockade and enhanced by Coulomb coupling *** also show other parameters for adjusting and obtaining entanglement,such as the driving power and the frequencies of the two oscillators,and the entanglement is robust against *** study proves a way for adjusting stationary entanglement between two optomechanical oscillators by Coulomb interaction and Kerr medium.

关键词： entanglement Kerr interaction Coulomb interaction optomechanics

Tea drinking and risk of pancreatic cancer

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Chinese Medical Journal 2014年第20期127卷 3638-3644页

作者： Wei Junbao chen long zhu Xiaodong Department of Therapeutic Radiology Guangxi AutonomousRegional Cancer Hospital & Cancer Hospital of Guangxi MedicalUniversity Nanning Guangxi 530021 China

Background Epidemiologic studies have reported inconsistent results regarding tea consumption and the risk of pancreatic cancer. This study aimed to investigate whether tea consumption is related to the risk of pancreatic cancer. Methods We searched Medline, EMBASE, ISI Web of Science, and the Cochrane library for studies published up to November 2013. We used a meta-analytic approach to estimate overall odds ratio （OR） and 95% confidence interval （CO for the highest versus the lowest tea consumption categodes. Results The summary OR for high versus no/almost never tea drinkers was 1.04 （95% CI： 0.91-1.20）, with no significant heterogeneity across studies （P=0.751;/2=0.0%）. The OR was 0.99 （95% CI： 0.77-1.28） in males and 1.01 （95% CI： 0.79- 1.29） in females. The OR was 1.07 （95% CI： 0.85-1.34） in Asian studies, 1.05 （95% CI： 0.84-1.31） in European studies, and 0.98 （95% CI： 0.72-1.34） in the US studies. The OR was 0.87 （95% CI： 0.69-1.10） without adjustment for a history of diabetes and 1.16 （95% CI： 0.97-0.39） after adjustment for a history of diabetes. The OR was 0.90 （95% CI： 0.72-1.12） without adjustment for alcohol drinking and 1.16 （95% CI： 0.96-1.39） after adjustment for alcohol drinking. The OR was 0.97 （95% CI： 0.76-1.25） without adjustment for BMI and 1.07 （95% CI： 0.87-1.31） after adjustment for BMI. Conclusion This systematic meta-analysis of cohort studies dose not provide quantitative evidence that tea consumption is appreciably related to the risk of pancreatic cancer, even at high doses.

关键词： tea pancreatic cancer meta-analysis

High spectral efficiency 4-mode 400-km transmission using hybrid probabilistically and geometrically shaped 128QAM

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Science China(Technological Sciences) 2024年第5期67卷 1628-1630页

作者： DING JunJie YU JianJun WANG chen long JianYu zhu Min ZHANG Jiao Pervasive Communication Research Center Purple Mountain LaboratoriesNanjing 211111China Key Laboratory for Information Science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China

Wavelength division multiplexing(WDM)and space division multiplexing(SDM)based on few-mode fiber(FMF)and multi-core fiber(MCF)have been vigorously developed to increase the transmission capacity of optical communication networks[1–5].However,the mode crosstalk generated in the mode division multiplexing(MDM)system causes the correlation between different mode signals,which seriously damages the transmission ***,an effective multiple-input-multiple-output(MIMO)time domain or frequency domain equalizer should be used to eliminate the crosstalk between different mode signals.

关键词： crosstalk fiber multiplexing

Evolution of interfacial heat transfer,contact behavior and microstructure during sub-rapid solidification of molten steel with different hydrogen contents

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Journal of Iron and Steel Research International 2024年第1期31卷 215-223页

作者： cheng Lu Wan-lin Wang chen-yang zhu Jie Zeng Xin-yuan Liu Hua-long Li School of Metallurgy and Environment Central South UniversityChangsha410083HunanChina National Center for International Research of Clean Metallurgy Central South UniversityChangsha410083HunanChina Institute of Research of Iron and Steel ShasteelZhangjiagang215625JiangsuChina

Typical Q235 low-carbon steel samples with different hydrogen contents(0.0004,0.0008,and 0.0013 wt.%)were prepared by adjusting the environment humidity and *** effects of hydrogen on interfacial heat transfer,contact behavior,and microstructure evolution were investigated using a novel droplet solidification *** results revealed that when the hydrogen content increases from 0.0004 to 0.0013 wt.%,the maximum heat flux between the molten steel and cooling substrate decreases from 8.01 to 6.19 MW/m^(2),and the total heat removed in the initial 2 s reduces from 10.30 to 8.27 MJ/m^(2).Moreover,the final contact angle between the molten steel and substrate increases from 103.741°to 113.697°,and the number of pores on the droplet bottom surface increases significantly from 21 to 210 with the increase in *** surface roughness of the droplet bottom surface increases from 20.902 to 49.181 *** addition,the average grain size of the droplet increases from 14.778 to 33.548 pm with the increase in the hydrogen *** interfacial contact condition becomes worse due to the escape of hydrogen from the steel matrix during the cooling process,which leads to the reduction in the interfacial heat transfer and the increase in the grain size.

关键词： Strip casting Hydrogen content Interfacial heat transfer behavior Contact behavior Microstructure evolution

Analysis and optimization of stamping and forming process of bearing outer ring

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Theoretical & Applied Mechanics Letters 2024年第3期14卷 227-237页

作者： Shichao zhu Yulu Ding Bing long Hun Guo Linhan Ouyang Wengang chen Zhengyi Jiang College of Aeronautics and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213002China College of Economics and Management Nanjing University of Aeronautics and AstronauticsNanjing 211106China eering University of WollongongWollongong NSW 2522Australia

To address the common issues of wrinkling,tearing,and uneven wall thickness in the actual sheet metal stamp-ing process of the outer ring of needle roller bearings,this study analyzes critical technical indicators such asforming limits,thickness distribution,and principal strains in the forming process in ***-dimensionalmodels of the concave and convex dies were *** effects of different process parameters,includingstamping speed,edge pressure,sheet metal thickness,and friction coefficient,on the quality of the forming partswere investigated by varying these ***,the orthogonal experimental method was used todetermine an optimal experimental group from multiple sets of *** was found that under the processparameters of a stamping speed of 3000 mm/s,edge pressure of 2000 N,sheet metal thickness of 0.9 mm,andfriction coefficient of 0.125,the forming quality of the outer ring of the bearing is ideal.

关键词： Plate stamping Bearing outer ring Mold design Optimization

Privacy-Preserving Federated Mobility Prediction with Compound Data and Model Perturbation Mechanism

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China Communications 2024年第3期21卷 160-173页

作者： long Qingyue Wang Huandong chen Huiming Jin Depeng zhu Lin Yu Li Li Yong Beijing National Research Center for Information Science and Technology(BNRist) Department of Electronic EngineeringTsinghua UniversityBeijing 100084China China Mobile Research Beijing 100032China

Human mobility prediction is important for many ***,training an accurate mobility prediction model requires a large scale of human trajectories,where privacy issues become an important *** rising federated learning provides us with a promising solution to this problem,which enables mobile devices to collaboratively learn a shared prediction model while keeping all the training data on the device,decoupling the ability to do machine learning from the need to store the data in the ***,existing federated learningbased methods either do not provide privacy guarantees or have vulnerability in terms of privacy *** this paper,we combine the techniques of data perturbation and model perturbation mechanisms and propose a privacy-preserving mobility prediction algorithm,where we add noise to the transmitted model and the raw data collaboratively to protect user privacy and keep the mobility prediction *** experimental results show that our proposed method significantly outperforms the existing stateof-the-art mobility prediction method in terms of defensive performance against practical attacks while having comparable mobility prediction performance,demonstrating its effectiveness.

关键词： federated learning mobility prediction privacy

A proof system of the CaIT calculus

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Frontiers of Computer Science 2024年第2期18卷 123-137页

作者： Ningning chen Huibiao zhu Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062China

The Internet of Things(IoT)can realize the interconnection of people,machines,and things anytime,*** of the existing research mainly focuses on the practical applications of IoT,and there is a lack of research on modeling and reasoning about IoT systems from the perspective of formal ***,the Calculus of the Internet of Things(CaIT)has been proposed to specify and analyze IoT systems before the actual implementation,which can effectively improve development efficiency,and enhance system quality and *** verify the correctness of IoT systems described by CaIT,this paper presents a proof system for CaIT,in which specifications and verifications are based on the extended Hoare Logic with ***,we explore the cooperation between isolated proofs to validate the postconditions of the communication actions occurring in these proofs,with a particular focus on broadcast *** also demonstrate the soundness of our proof system.A simple“smart home”is given to illustrate the availability of our proof system.

关键词： Internet of Things(loT) Calculus of the Internet of Things(CalT) extended hoare logic cooperation smart home

Efficient Removal of Phosphate from Aqueous Solutions Using Corundum-hollow-spheres Supported Caclined Hydrotalcite Porous Thin Films

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 44-49页

作者：刘云才 zhu chen School of Architecture and Materials Engineering Hubei Second Normal UniversityWuhan 430205China

Phosphate was removed from aqueous environment by corundum-hollow-spheres supported caclined hydrotalcite (cHT) thin films. Mg-Al-CO3 hydrotalcite (HT) thin films were deposited on corundumhollow-sphere substrates by hydrothermal homogeneous precipitation at 120℃for 30-240 min and cHT thin films were obtained by annealing of the HT thin films at 500℃for 180 min. Their crystal phase, morphology and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results show that homogeneous, well-crystallized and hierarchical flower-like thin films were deposited firmly on the surface of the corundum. The mechanism of nucleation and growth of the HT thin films was fitted well with the anion coordination polyhedron growth unit model. To determine the absorption of phosphate by this adsorbent, different bed depth (10-30 cm) and flow rate (1.0-3.0 m L/min) were examined by column experiments. The highest removal efficiency of phosphate amounted to 98.5%under optimum condition (pH=7.2). The adsorption capacity increased as the bed depth increased and decreased as the flow rate increased.

关键词： adsorption phosphate hydrotalcite corundum-hollow-sphere hydrothermal homogeneous precipitation thermal anneal