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Exact Traveling Wave Solutions and Bifurcations in a Nonlinear Elastic Rod Equation

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Acta Mathematicae Applicatae Sinica 2010年第2期26卷 283-306页

作者： Ji-bin Li tian-lan He Center for Dynamical Systems and Nonlinear Studies Kunming University of Science and Technology Yunnan650093 China Department of Mathematics Zhejiang Normal University Zhejiang 321004 China

The exact parametric representations of the traveling wave solutions for a nonlinear elastic rod equation are considered. By using the method of planar dynamical systems, in different parameter regions, the phase portraits of the corresponding traveling wave system are given. Exact explicit kink wave solutions, periodic wave solutions and some unbounded wave solutions are obtained.

关键词： kink wave solution periodic wave solution qualitative method bifurcation elliptic function

Somatic mutant clone screening: scan for novel NASH target genes in mouse liver

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Signal Transduction and Targeted Therapy 2023年第9期8卷 3902-3903页

作者： tian lan Adrien Guillot Frank Tacke Lab of Gastroenterology and Hepatology State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengduChina Department of Gastroenterology West China HospitalSichuan UniversityChengduChina Department of Hepatology&Gastroenterology Charité-Universitätsmedizin BerlinCampus Virchow-Klinikum and Campus CharitéMitteBerlinGermany

In a landmark study recently published in Cell,Wang et *** a novel method of somatic adeno-associated virus(AAV)-transposon in vivo clonal screening(termed MOSAICS),which is capable to generate multiple mutant hepatocyte clones within the same tissue and thereby to scan for non-alcoholic steatohepatitis(NASH)target genes(Fig.1).1 Non-alcoholic fatty liver disease(NAFLD)is the most common liver disease affecting about 20–30%of the global population and associated with metabolic *** can progress to NASH,characterized by liver inflammation,steatosis and hepato-cyte ballooning,and NAFLD/NASH can lead to fibrosis,cirrhosis,and ultimately liver *** decades,researchers have been seeking to understand its pathogenesis and to discover ther-apeutic strategies to treat NAFLD/***,up to now,there is still no specific pharmacotherapy available.

关键词： balloon NAFLD inflammation

Efficient hardware-based private information retrieval using partial reshuffle

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High Technology Letters 2010年第3期16卷 263-267页

作者： lan tian Qin Zhiguang School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 P.R. China

The paper proposes a novel hardware-based private information retrieval （HWPIR） protocol. By partially reshuffling previously accessed items in each round, instead of frequently reshuffling the whole database, the scheme makes better use of shuffled data copies and achieves the computation overhead at O（/N/K）,where N and k are the sizes of the database and secure storage respectively. For securestorage with moderate size, e.g. k = O（/N）, the overhead is 0（4/N）. The result is much better than the state-of-art schemes （as compared to e.g. O（log2N））. Without increasing response time and communication cost, the proposed protocol is truly practicable regardless of the database size. The security and preformance of the protocol is formally analyzed.

关键词： private information retrieval (PIR) trusted hardware reshuffle security practicality

Function-oriented optimization design method for underactuated tendon-driven humanoid prosthetic hand

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Frontiers of Mechanical Engineering 2022年第3期17卷 75-89页

作者： Yue ZHENG Xiangxin LI lan tian Guanglin LI CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen518055China Shenzhen College of Advanced Technology University of Chinese Academy of SciencesShenzhen518055China SIAT Branch Shenzhen Institute of Artificial Intelligence and Robotics for SocietyShenzhen518055China Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen518055China

The loss of hand functions in upper limb amputees severely restricts their mobility in daily *** a humanoid prosthetic hand would be an effective way of restoring lost hand *** a prosthetic hand design,replicating the natural and dexterous grasping functions with a few actuators remains a big *** this study,a function-oriented optimization design(FOD)method is proposed for the design of a tendon-driven humanoid prosthetic *** optimization function of different functional conditions of full-phalanx contact,total contact force,and force isotropy was constructed based on the kinetostatic model of a prosthetic finger for the evaluation of grasping *** a genetic algorithm,the optimal geometric parameters of the prosthetic finger could be determined for specific functional *** results reveal that the structure of the prosthetic finger is significantly different when designed for different functional requirements and grasping target sizes.A prosthetic finger was fabricated and tested with grasping *** mean absolute percentage error between the theoretical value and the experimental result is less than 10%,demonstrating that the kinetostatic model of the prosthetic finger is effective and makes the FOD method *** study suggests that the FOD method enables the systematic evaluation of grasping performance for prosthetic hands in the design stage,which could improve the design efficiency and help prosthetic hands meet the design requirements.

关键词： function-oriented tendon driven prosthetic hand optimization humanoid underactuated

Spray and mixing characteristics of liquid jet in a tubular gas-liquid atomization mixer

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Chinese Journal of Chemical Engineering 2021年第6期34卷 1-11页

作者： Lingzhen Kong Jiaqing Chen tian lan Huan Sun Kuisheng Wang School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Beijing Key Laboratory of Pipeline Critical Technology and Equipment for DeepWater Oil&Gas Development Beijing 102617China College of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijing 100029China

For the design and optimization of a tubular gas-liquid atomization mixer,the atomization and mixing characteristics of liquid jet breakup in the limited tube space is a key *** this study,the primary breakup process of liquid jet columnwas analyzed by high-speed camera,then the droplet size and velocity distribution of atomized droplets were measured by Phase-Doppler anemometry(PDA).The hydrodynamic characteristics of gas flow in tubular gas-liquid atomization mixer were analyzed by computational fluid dynamics(CFD)numerical *** results indicate that the liquid flow rate has little effect on the atomization droplet size and atomization pressure drop,and the gas flowrate is themain influence *** all experimental gas flowconditions,the liquid jet column undergoes a primary breakup process,forming larger liquid blocks and *** the gas flow rate(Qg)is less than 127 m^(3)·h^(−1),the secondary breakup of large liquid blocks and droplets does not occur in venturi throat *** Sauter mean diameter(SMD)of droplets measured at the outlet is more than 140μm,and the distribution is *** Qg>127 m^(3)·h^(−1),the large liquid blocks and droplets have secondary breakup process at the throat *** SMD of droplets measured at the outlet is less than 140μm,and the distribution is *** 127

关键词： Atomization mixing Liquid jet Primary breakup Droplet breakup Droplet size

Impacts of electrochemical disinfection on the viability and structure of the microbiome in secondary effluent water

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Frontiers of Environmental Science & Engineering 2024年第5期18卷 73-83页

作者： Marvin Yeung lan tian Yuhong Liu Hairong Wang Jinying Xi Environmental Simulation and Pollution Control State Key Joint Laboratory School of EnvironmentTsinghua UniversityBeijing100084China Graduate School at Shenzhen Tsinghua UniversityShenzhen518055China

Electrochemical disinfection(ECD)is a promising disinfection technique for wastewater reclamation;however,the impacts of ECD on the microbiome in secondary effluent wastewater remain *** this study,Propidium monoazide-qPCR(PMA-qPCR)and the plate count method were used to evaluate the inactivation performance,and the PMA-16S rRNA gene sequences of living cells were targeted to study the microbiome.A discrepancy was found between PMA-qPCR and the plate count method in the evaluation of cell count,with increases of 1.5 to 2.2 orders of magnitude in the disinfection rate after 150 s of ***,the cell count recovered and occasionally exceeded original levels within 3 d after *** was suppressed after ECD,but the microbiome after 150 s disinfection retained a higher level of evenness and stability in the community with a median Shannon index(>3.7).Pathogenic bacteria remained high in relative abundance even after 150 s of 25 V disinfection,but the biofilm-forming population was effectively suppressed by *** co-occurrence network revealed a centralized and fragile network as disinfection persisted,demonstrating the destabilizing effects of ECD on the *** pathways for cell membrane synthesis and organic compound degradation were enriched after *** reaction of the microbiome after ECD was similar to other disinfection techniques in terms of community structure.

关键词： Electrochemical disinfection Secondary effluent Microbiome

Core-shell Cu@SiO_(2)/SiO_(2) catalyst for 1,6-hexanediol dehydrogenation toε-caprolactone:High activity and stability from core-shell nanostructure

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Nano Research 2023年第10期16卷 12270-12280页

作者： Fengyang Jiang tian lan Jiaqiang Sun Guofeng Zhao Yong Lu Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241002China

The gas-phase dehydrogenation of 1,6-hexanediol(1,6-HDO)toε-caprolactone(ε-CL)over the high-performance Cu-based catalysts is highly desirable,but with grand challenges,because the Cu nanoparticles(NPs)are easy to be sintered with the low Hüttig temperature(250℃ of reaction temperature).Herein,we report a highly efficient silica-encapsulated nano-Cu catalyst(Cu@SiO_(2)/SiO_(2))prepared via a complexation–impregnation method for the dehydrogenation of 1,6-HDO,exhibiting a 1,6-HDO conversion of 95.3%andε-CL selectivity of 80.0%at 270℃.The catalyst also has the outstanding thermal stability(without sintering up to 270℃ for 100 h on stream),which can be attributed to the effective encapsulation of the SiO_(2)*** addition,the reaction network of 1,6-HDO dehydrogenation is ***,the pyridine-diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and in-situ X-ray photoelectron spectroscopy(XPS)reveal that the Cu^(0) species favor the conversion of 1,6-HDO toε-*** synergistic effect of Cu+and Cu^(0) benefits the conversion ofε-CL to 2-methylcyclopentanone(2-MCPN).This study is beneficial for designing the high-performance Cu-based catalysts for 1,6-HDO toε-CL,understanding the reaction network of 1,6-HDO dehydrogenation over the Cu-based catalysts,and offering a strong foundation for the largescale production ofε-CL.

关键词： core–shell nanostructure Cu-based catalyst 1 6-hexanediol dehydrogenation ε-caprolactone

Optimized Consensus for Blockchain in Internet of Things Networks via Reinforcement Learning

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Tsinghua Science and Technology 2023年第6期28卷 1009-1022页

作者： Yifei Zou Zongjing Jin Yanwei Zheng Dongxiao Yu tian lan Institute of Intelligent Computing School of Computer Science and TechnologyShandong UniversityQingdao 266237China Department of Electrical and Computer Engineering George Washington UniversityWashingtonDC 20052USA

Most blockchain systems currently adopt resource-consuming protocols to achieve consensus between miners;for example,the Proof-of-Work(PoW)and Practical Byzantine Fault Tolerant(PBFT)schemes,which have a high consumption of computing/communication resources and usually require reliable communications with bounded ***,these protocols may be unsuitable for Internet of Things(IoT)networks because the IoT devices are usually lightweight,battery-operated,and deployed in an unreliable wireless ***,this paper studies an efficient consensus protocol for blockchain in IoT networks via reinforcement ***,the consensus protocol in this work is designed on the basis of the Proof-of-Communication(PoC)scheme directly in a single-hop wireless network with unreliable communications.A distributed MultiAgent Reinforcement Learning(MARL)algorithm is proposed to improve the efficiency and fairness of consensus for miners in the blockchain *** this algorithm,each agent uses a matrix to depict the efficiency and fairness of the recent consensus and tunes its actions and rewards carefully in an actor-critic framework to seek effective *** results from the simulation show that the fairness of consensus in the proposed algorithm is guaranteed,and the efficiency nearly reaches a centralized optimal solution.

关键词： consensus in blockchain Proof-of-Communication(PoC) MultiAgent Reinforcement Learning(MARL) Internet of Things(IoT)networks

GHM-FKNN:a generalized Heronian mean based fuzzy k-nearest neighbor classifier for the stock trend prediction

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High Technology Letters 2023年第2期29卷 122-129页

作者：吴振峰 WANG Mengmeng lan tian ZHANG Anyuan Institute of Scientific and Technical Information of China Beijing 100038P.R.China School of Economics Renmin University of ChinaBeijing 100872P.R.China Shandong Provincial Center for Quality Control of Feed and Veterinary Drug Jinan 250022P.R.China

Stock trend prediction is a challenging problem because it involves many *** at the problem that some existing machine learning techniques, such as random forest(RF), probabilistic random forest(PRF), k-nearest neighbor(KNN), and fuzzy KNN(FKNN), have difficulty in accurately predicting the stock trend(uptrend or downtrend) for a given date, a generalized Heronian mean(GHM) based FKNN predictor named GHM-FKNN was ***-FKNN combines GHM aggregation function with the ideas of the classical FKNN *** evaluation, the comparison results elucidated that GHM-FKNN outperformed the other best existing methods RF, PRF, KNN and FKNN on independent test datasets corresponding to three stocks, namely AAPL, AMZN and *** with RF, PRF, KNN and FKNN, GHM-FKNN achieved the best performance with accuracy of 62.37% for AAPL, 58.25% for AMZN, and 64.10% for NFLX.

关键词： stock trend prediction Heronian mean fuzzy k-nearest neighbor(FKNN)