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Quasi-classical trajectory study of H+LiH（v=0,1,2,j=0）→Li+H2 reaction on a new global potential energy surface

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Chinese Physics B 2019年第8期28卷 105-111页

作者： yu-liang Wang De-Zhi su Cun-Hai Liu Hui Li School of Basic Sciences for Aviation Naval Aviation University

Quasi-classical trajectory(QCT)calculations are reported for the H+LiH(v=0-2,j=0)→Li+H2 reaction on a new ground electronic state global potential energy surface(PES)of the LiH2 *** probability and integral cross sections(ICSs)are calculated for collision energies in the range of 0 eV-0.5 *** agreement is found in the comparison between present results and previous available theoretical *** carried out statistical analyses with all the trajectories and found two main distinct reaction mechanisms in the collision process,in which the stripping mechanism(i.e.,without roaming process)is dominated over the collision energy *** polarization dependent differential cross sections(PDDCSs)indicate that forward scattering dominates the reaction due to the dominated ***,the reactant vibration leads to a reduction of the reactivity because of the barrierless and attractive features of PES and mass combination of the system.

关键词： quasi-classical trajectory H+LiH vibrational excitation reaction dynamics

High performance photodegradation resistant PVA@TiO_(2)/carboxyl-PES self-healing reactive ultrafiltration membrane

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Chinese Journal of Chemical Engineering 2024年第2期66卷 31-39页

作者： yu liang yuanfang Fan Zhongmin su Mingxin Huo Xia Yang Hongliang Huo Chi Wang Zhi Geng College of Environment Engineering Research Center of Low-Carbon Treatment and Green Development of Polluted Water in Northeast ChinaMinistry of EducationNortheast Normal UniversityChangchun 130117China School of Science Hainan UniversityHaikou 570225China

The occurrence of ultrafiltration(UF)membrane fouling frequently hampers the sustainable advancement of UF *** self-cleaning UF membranes can effectively alleviate the problem of membrane ***,the self-cleaning process may accelerate membrane *** these concerns,we present an innovative design concept for composite self-healing materials based on self-cleaning UF *** begin,TiO_(2)nanoparticles were incorporated into the polymer molecular structure via molecular design,resulting in the synthesis of TiO_(2)/carboxyl-polyether sulfone(PES)hybrid ***,the nonsolvent-induced phase inversion technique was employed to prepare a novel of UF ***,a polyvinyl alcohol(PVA)hydrogel coating was applied to the hybrid UF membrane surface to create PVA@TiO_(2)/carboxyl-PES self-healing reactive UF *** establishing a covalent bond,the TiO_(2)nanoparticles were effectively and uniformly dispersed within the UF membrane,leading to exceptional self-cleaning ***,the water-absorbing and swelling properties of PVA hydrogel,along with its capacity to form hydrogen bonds with water molecules,resulted in UF membranes with improved hydrophilicity and active self-healing *** results demonstrated that the water contact angle of PVA@5%TiO_(2)/carboxyl-PES UF membrane was 43.1°.Following a 1-h exposure to simulated solar exposure,the water flux recovery ratio increased from 48.16%to 81.03%.Moreover,even after undergoing five cycles of 12-h simulated sunlight exposure,the UF membranes exhibited a consistent retention rate of over 97%,thus fully demonstrating their exceptional self-cleaning,antifouling,and selfhealing *** anticipate that the self-healing reactive UF membrane system will serve as a pioneering and comprehensive solution for the self-cleaning antifouling challenges encountered in UF membranes while also effectively mitigating the aging effects of reactive

关键词： Ultrafiltration membrane Self-cleaning Self-healing Poly(aryl ether sulfone)

Numerical Study of Propulsion Mechanism for Oscillating Rigid and Flexible Tuna-Tails

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Journal of Bionic Engineering 2011年第4期8卷 406-417页

作者： liang Yang yumin su Qing xiao State Key Laboratory of Autonomous Underwater Vehicle Harbin Engineering University Harbin 150001 P. R. China Department of Naval Architecture and Marine Engineering University of Strathelyde Glasgow G40LZ United Kingdom

Numerical study on the unsteady hydrodynamic characteristics of oscillating rigid and flexible tuna-tails in viscous flow-field is performed. Investigations are conducted using Reynolds-Averaged Navier-Stokes （RANS） equations with a moving adaptive mesh. The effect of swimming speed, flapping amplitude, frequency and flexure amplitude on the propulsion performance of the rigid and flexible tuna-tails are investigated. Computational results reveal that a pair of leading edge vortices develop along the tail surface as it undergoes an oscillating motion. The propulsive efficiency has a strong correlation with various locomotive parameters. Peak propulsive efficiency can be obtained by adjusting these parameters. Particularly, when input power coeffcient is less than 2.8, the rigid tail generates larger thrust force and higher propulsive efficiency than flexible tail. However, when input power coefficient is larger than 2.8, flexible tail is superior to rigid tail.

关键词： tuna-tail RANS propulsion mechanism hydrodynamic characteristics viscous flow-fields

A statistical approach to determine 2D optimal equivalent linear parameters with application to earthquake engineering

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Earthquake Engineering and Engineering Vibration 2012年第3期11卷 415-425页

作者： su liang Xiao Nan Wang Yi College of Civil Engineering and Architecture Zhejiang University Hangzhou 310058 China China Aviation Planning and Construction Development Co. Ltd Beijing 100120 China

The equivalent linearization method approximates the maximum displacement response of nonlinear structures through the corresponding equivalent linear system. By using the particle swarm optimization technique, a new statistical approach is developed to determine the key parameters of such an equivalent linear system over a 2D space of period and damping ratio. The new optimization criterion realizes the consideration of the structural safety margin in the equivalent linearization method when applied to the performance-based seismic design/evaluation of engineering structures. As an application, equations for equivalent system parameters of both bilinear hysteretic and stiffness degrading single-degree-of- freedom systems are deduced with the assumption of a constant ductility ratio. Error analyses are also performed to validate the proposed approach.

关键词： equivalent linearization particle swarm optimization structural safety nonlinear displacement response performance-based engineering

Free Information Flow Benefits Truth Seeking

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Journal of Systems Science & Complexity 2018年第4期31卷 964-974页

作者： su Wei yu Yongguang School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Knowledge Automation for Industrial Processes Ministry of Education Beijing 100083 China School of Science Beijing Jiaotong University Beijing 100044 China

How can we approach the truth in a society？ It may depend on various factors. In this paper, using a well-established truth seeking model, the authors show that the persistent free information flow will bring us to the truth. Here the free information flow is modeled as the environmental random noise that could alter one＇s cognition. Without the random noise, the model predicts that the truth can only be captured by the truth seekers who own actively perceptive ability of the truth and their believers, while the other individuals may stick to falsehood. But under the influence of the random noise, the authors strictly prove that even there is only one truth seeker in the group, all individuals will finally approach the truth.

关键词： Free information flow opinion dynamics random noise social networks truth seeking

A universal charge-compensating strategy for high-energy-density pseudocapacitors

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Journal of Energy Chemistry 2023年第3期78卷 333-339,I0010页

作者： Baoyi Yin Jiaqi Zhang yuanhui su yu Huan liang Hao Chen Wang Xun Hu Tao Wei School of Material Science and Engineering University of Jinan336 Nanxinzhuang West RoadJinan 250022ShandongChina School of Microelectronics Dalian University of TechnologyDalian 116024LiaoningChina Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of ASIC and Systems School of MicroelectronicsFudan UniversityShanghai 200433China

For pseudocapacitive electrode materials(PseEMs),despite much progress having been made in achieving both high power density and high energy density,a general strategy to guide the enhancement of intrinsic capacitive properties of PseEMs remains ***,we demonstrate a universal chargecompensating strategy to improve the charge-storage capability of PseEMs intrinsically:ⅰ) in the electrolyte with anion as charge carriers(such as OH-),reducing the multivalent cations of PseEMs into lower valences could create more reversible low-to-high valence redox cou ples to promote the intercalation of the anions;ⅱ) in the electrolytes with cation as charge carriers(such as H^(+),Li^(+),Na^(+)),oxidizing the multivalent cations of PseEMs into higher valences could introduce more reversible high-to-low valence redox couples to promote the intercalation of the *** we demonstrated that the improved intrinsic charge-storage capability for PseEMs originates from the increased Faradaic charge storage sites.

关键词： supercapacitors Universal charge-compensating strategy Changed valence state Increased Faradaic charge storage sites

Probabilistic modeling of scenes using object frames

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Science China(Information Sciences) 2015年第3期58卷 119-131页

作者： su Hao yu AdamsWei School of Mathematics Beihang University Department of Computer Science Stanford University Language Technologies Institute Carnegie Mellon University

In this paper,we propose a probabilistic scene model using object frames,each of which is a group of co-occurring objects with fixed spatial *** contrast to standard co-occurrence models,which mostly explore the pairwise co-existence of objects,the proposed model captures the spatial relationship among groups of *** information is closely tied to the semantics of the underlying scenes,which allows us to perform object detection and scene recognition in a unified *** proposed probabilistic model has two major *** first models the dependencies between object frames and objects by adopting the Latent Dirichlet Allocation model for text *** second component characterizes the dependencies between object frames and scenes by establishing a mapping between global image features and object frame *** results show that the induced object frames are both semantically meaningful and spatially *** addition,our model significantly improves the performance of object recognition and scene retrieval.

关键词： Bayes network scene understanding object frame probabilistic model

Exploratory Precipitation in North-Central China during the Past Four Centuries

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Acta Geologica Sinica(English Edition) 2010年第1期84卷 223-229页

作者： YI liang yu Hongjun XUXingyong YAO Jing su Qiao GE Junyi Yantai Institute of Coastal Zone Research for sustainable Development Chinese Academy of Sciences Yantai Shandong 264003 China Institute of Oceanology Chinese Academy of Sciences Qingdao Shandong 266071 China First Institute of Oceanography State Oceanic Administration Qingdao Shandong 266061 China Institute of Earth Environment Chinese Academy of Sciences Xi＇an Shaanxi 710075 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

Two robust precipitation reconstructions were conducted by combining tree-ring chronologies, dryness/wetness indices from historical documents, and climate data from the global grid. It was found that the recurrent drought history of a region can help us understand the variability of precipitation. Several dry/wet periods during the past four centuries and potential cycles of precipitation variation were determined. Furthermore, the reconstructions are not only consistent well with each other in North-central China, but also in good agreement with variations of precipitation in northeastern Mongolia, the Longxi area in Gangsu Province and the Dulan area of Qinghai Province, and the snow accumulation of the Guliya glacier. These synchronous variations indicate that it is valuable to study various climate records, find common information and determine the driving force of climate change.

关键词： precipitation reconstruction dryness/wetness index tree-ring chronology North-centralChina

Evaluation of Ion Release from Four Dental Sealants

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Current Medical Science 2018年第3期38卷 524-529页

作者： liang CHEN su-juan ZENG yu-hong LI Min-quan DU The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education School & Hospital of Stomatology Wuhan University Wuhan 430079 China Key Laboratory of Oral Medicine Guangzhou Institute of Oral Disease Stomatology Hospital of Guangzhou Medical University Guangzhou 510140 China

The purpose of this study was to determine the ion release from four commercially available pit-and-fissure sealants [3M Clinpro, 3M ConciseTM, BeautiSealant （BS）, and GI FX-Ⅱ）]. With each brand, 18 specimens were prepared. Their fluoride release in de-ionized water was measured by fluoride electrode, while the release of silicate （Si）, aluminum （A1）, sodium （Na）, calcium （Ca）, strontium （Sr）, and phosphorus （P） was measured by inductively coupled plasma atomic emission spectroscopy （ICP-AES） on days 1, 3, 7, 14, 21, and 28. The result showed that fluoride was not released from 3M ConciseTM. GI FX-II displayed the largest fluoride release, which, however, dropped rapidly on day 3.3M Clinpro exhibited less fluoride release than GI FX-II and BS did. At any time during the 28-day experimental period, GI FX-II released more Na than the other sealants （P〈0.001）. BS ranked the second in Na release, and a small amount of Na ions was released from the 3M Clinpro and 3M ConciseTM samples. Al ions were only detected from BS and GI FX-Ⅱ, but not from the 3M Clinpro and 3M ConciseTM. Additionally GI FX-II had the largest Si release among the four brands at any time during the experimental period （P〈0.001）. Ca ions were detected from 3M Clinpro and 3M ConciseTM, but not from GI FX-Ⅱ. BS released more Sr than the other sealants at any time during the experimental period （P〈0.001）. All the samples released similar amounts of P continuously during these 28 days. In conclusion, based on the type and the amount of ion release, BS is the best pit-and-fissure sealant among the four brands.

关键词： ion release dental sealant