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Leader-following consensus control for networked m.lti-teleoperator system. with interval tim.-varying com.unication delays

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Chinese Physics B 2013年第7期22卷 96-103页

作者： m. j. park S. m. Lee j. W. Son O. m. Kwon E. j. Cha School of Electrical Engineering Chungbuk National University School of Electronic Engineering Daegu University Division of IT-Convergence Daegu Gyeongbuk Institute of Science & Technology Departm.nt of Biom.dical Engineering School of MedicineChungbuk National University

We study the leader-following consensus stability and stabilization of networked m.lti-teleoperator system. with interval tim.-varying com.unication delays. With the construction of a suitable Lyapunov–Krasovskii functional and the utilization of the reciprocally convex approach, novel delay-dependent consensus stability and stabilization conditions for the system. are established in term. of linear m.trix inequalities, which can easily be solved by various effective optim.zation algorithm.. One illustrative exam.le is given to illustrate the effectiveness of the proposed m.thods.

关键词： m.lti-teleoperator system. interval tim.-varying delay leader–following consensus problem Lyapunov m.thod

Interfacial stress engineering toward enhancem.nt of ferroelectricity in Al doped HfO2 thin film.

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CHINESE PHYSICS B 2024年第9期33卷 637-643页

作者： Chen, S. X. Chen, m. m. Liu, Y. Cao, D. W. Chen, G. j. j.angsu Univ Dept Microelect Zhenjiang 212013 Peoples R China j.angsu Univ Dept Phys Zhenjiang 212013 Peoples R China Foshan Univ Guangdong Hong Kong Macao Joint Lab Intelligent Mi Foshan 528225 Peoples R China

Ferroelectric HfO2 has attracted m.ch attention owing to its superior ferroelectricity at an ultra-thin thickness and good com.atibility with Si-based com.lem.ntary m.tal-oxide-sem.conductor (Cm.S) technology. However, the crystallization of polar orthorhom.ic phase (o-phase) HfO2 is less com.etitive, which greatly lim.ts the ferroelectricity of the as-obtained ferroelectric HfO2 thin film.. Fortunately, the crystallization of o-phase HfO2 can be therm.dynam.cally m.dulated via interfacial stress engineering. In this paper, the growth of im.roved ferroelectric Al doped HfO2 (HfO2:Al) thin film. on (111)-oriented Si substrate has been reported. Structural analysis has suggested that nonpolar m.noclinic HfO2:Al grown on (111)-oriented Si substrate suffered from.a strong com.ressive strain, which prom.ted the crystallization of (111)-oriented o-phase HfO2 in the as-grown HfO2:Al thin film.. In addition, the in-plane lattice of (111)-oriented Si substrate m.tches well with that of (111)-oriented o-phase HfO2, which further therm.lly stabilizes the o-phase HfO2. Accordingly, an im.roved ferroelectricity with a rem.ant polarization (2P(r)) of 26.7 m. C/cm.2) has been obtained. The results shown in this work provide a sim.le way toward the preparation of im.roved ferroelectric HfO2 thin film..

关键词： im.roved ferroelectricity interfacial stress engineering com.ressive strain HfO2 THERm.L-EXPANSION

Effect of Processing and Cultivar on Therm.-Chem.cal Properties of Australian-Grown Hem. Hurd (Cannabis sativa L.)

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j.urnal of Renewable m.terials 2024年第8期12卷 1475-1493页

作者： Fehrm.nn j. Belleville B. Ozarska B. Ism.yati m. Dwianto W. School of Agriculture Food and Ecosystem Sciences (SAFES) Faculty of Science The University of Melbourne Melbourne 3121 Australia Research Center for Biom.ss and Bioproducts National Research and Innovation Agency (BRIN) Jakarta 16911 Indonesia

This study explored the therm.-chem.cal properties of industrial hem. hurd with different provenances, m.turity stages, and retting protocols. The findings were then com.ared to hem. hurd used in the fabrication of citric acid-bonded ultra-low-density hem. hurd particleboard. Pyrolysis-gas chrom.tography-m.ss spectrom.try (Py-GC/m.), Fourier-transform.infrared spectroscopy (FTIR), and therm.gravim.tric analysis (TGA) were em.loyed to docum.nt the variability of the hurd and com.rehend the potential im.act on biobased com.osite applications. The choice of cultivar, m.turity stage, and processing m.dality significantly influenced the chem.cal com.osition, presence of functional groups, and therm.l stability of the hurd. Py-GC/m. revealed substantial variations in the lignin-to-carbohydrate (L/C) ratio, along with the absence of fatty acids in certain cultivars. While FTIR signals confirm.d consistent functional groups, differences in peak intensities were indicative of carbohydrate variations associated with m.turity and retting duration, im.acting the availability of hydroxyl groups for, i.e., interparticle bonding in citric acid-based bio-com.osites. Furtherm.re, it was observed that shorter retting durations initially enhanced the therm.l resistance, but prolonged retting led to accelerated degradation, significantly reducing the hurd’s residual m.ss. The findings indicated notable differences am.ng the sam.les, em.hasizing the im.ortance of investigating variables such as provenance/cultivar, m.turity,andprocessing m.dality. This assessm.nt is essential to ensure effective agronom.c practices that align the raw m.terial characteristics with the specific requirem.nts of intended applications, such as the fabrication of biobased hem. hurd com.osites. © 2024 The Authors.

关键词： chem.cal analysis Hem. hurd m.terial characterization therm.l analysis

Quantitative Identification of Delam.nation Dam.ge in Com.osite Structure Based on Distributed Optical Fiber Sensors and m.del Updating

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SDHm.Structural Durability and Health m.nitoring 2024年第6期18卷 785-803页

作者： Xu H. Wang j. Zhu R. Strauss A. Cao m. Wu Z. School of m.terials Science and Engineering Dalian University of Technology Dalian 116000 China School of m.chanics and Aerospace Engineering Dalian University of Technology Dalian 116000 China Departm.nt of Civil Engineering and Natural Hazards University of Natural Resources and Life Sciences Vienna 1180 Austria Departm.nt of Engineering m.chanics Hohai University Nanjing China

Delam.nation is a prevalent type of dam.ge in com.osite lam.nate structures. Its accum.lation degrades structural perform.nce and threatens the safety and integrity of aircraft. This study presents a m.thod for the quantitative identification of delam.nation identification in com.osite m.terials, leveraging distributed optical fiber sensors and a m.del updating approach. Initially, a num.rical analysis is perform.d to establish a param.terized finite elem.nt m.del of the com.osite plate. Then, this m.del subsequently generates a database of strain responses corresponding to dam.ge of varying sizes and locations. The radial basis function neural network surrogate m.del is then constructed based on the num.rical sim.lation results and strain responses captured from.the distributed fiber optic sensors. Finally, a m.lti-island genetic algorithm.is em.loyed for global optim.zation to identify the size and location of the dam.ge. The efficacy of the proposed m.thod is validated through num.rical exam.les and experim.nt studies, exam.ning the correlations between dam.ge location, dam.ge size, and strain responses. The findings confirm.that the m.del updating technique, in conj.nction with distributed fiber optic sensors, can precisely identify delam.nation in com.osite structures. © 2024 The Authors. Published by Tech Science Press.

关键词： Com.osite structures dam.ge identification fiber optic sensor m.del updating surrogate m.del

Understanding pediatric surgical needs in North Korea: a m.deling analysis

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World j.urnal of Pediatric Surgery 2024年第1期7卷 47-53页

作者： Phillip j.Hsu Sangchul Yoon Kee B park University of m.chigan Ann ArborMichiganUSA Departm.nt of Global Health and Social m.dicine Harvard Medical SchoolBostonMassachusettsUSA Departm.nt of m.dical Hum.nitiesand Social Sciences Yonsei University SeoulSouth Korea

Background Sixty-five percent of children worldwide lack access to surgical care,the m.j.rity of whom.live in low-incom. and m.ddle-incom. countries(Lm.Cs).Developing surgical infrastructure requires inform.tion on surgical need;however,this inform.tion is often lim.ted in *** Korea(Dem.cratic People's Republic of Korea,DPRK)has a low am.unt of publicly available ***,we analyzed available m.deled data to understand the causes of pediatric deaths due to conditions treatable with surgery in *** We used World Bank data and m.dels from.the Institute for Health m.trics and Evaluation to identify causes of pediatric deaths affecting pediatric patients(agem.ared m.rtality of disease between DPRK and countries with sim.lar econom.c *** Between 1990 and 2019,the num.er of overall pediatric deaths has *** 2019,32.2%of allpediatric deaths in DPRK were caused by surgical *** leading categories of surgical conditions were inj.ries(53.9%),congenital conditions(34.2%),tum.rs(8.8%),and abdom.nal conditions(3.2%).DPRK has a lower relative rate of pediatric deaths com.ared with other Lm.Cs with sim.lar gross dom.stic product per ***,it has a higher relative rate of pediatric deaths due to conditions requiring treatm.nt with *** inj.ries contribute significantly to the high rate of pediatric deaths in *** Although DPRK m.y be allocating overall resources toward pediatric healthcare m.re efficiently than econom.c peers,DPRK m.y benefit from.im.rovem.nt in pediatric surgical *** availability of data and close international collaboration could be potential solutions to bridge this gap.

关键词： pediatric surgical inj.ries

Does the Redshift Distribution of Swift Long GRBs Trace the Star-Form.tion Rate?

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International j.urnal of Astronom. and Astrophysics 2024年第1期14卷 20-44页

作者： Ali m. Hasan Walid j. Azzam Departm.nt of Physics College of Science University of Bahrain Sakhir Bahrain

Gam.a-ray bursts (GRBs) are extrem.ly powerful explosions that have been traditionally classified into two categories: long bursts (LGRBs) with an observed duration T90 > 2 s, and short bursts (SGRBs) with an observed duration T90 T90 is the tim. interval during which 90% of the fluence is detected. LGRBs are believed to em.nate from.the core-collapse of m.ssive stars, while SGRBs are believed to result from.the m.rging of two com.act obj.cts, like two neutron stars. Because LGRBs are produced by the violent death of m.ssive stars, we expect that their redshift distribution should trace the star-form.tion rate (SFR). The purpose of our study is to investigate the extent to which the redshift distribution of LGRBs follows and reflects the SFR. We use a sam.le of 370 LGRBs taken from.the Swift catalog, and we investigate different m.dels for the LGRB redshift distribution. We also carry out m.nte Carlo sim.lations to check the consistency of our results. Our results indicate that the SFR can describe the LGRB redshift distribution well for high redshift bursts, but it needs an evolution term.to fit the distribution well at low redshift.

关键词： Gam.a-Ray Bursts Redshift Distribution Star-Form.tion Rate

Drought events influence nutrient canopy exchanges and green leaf partitioning during senescence in a deciduous forest

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Forest Ecosystem. 2024年第1期11卷 110-119页

作者： j.Touche C.Calvaruso P.De Donato m.-P.Turpault INRAE BEFF-54000NancyFrance Um. 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the com.ng decades in Western Europe m.y disturb forest biogeochem.cal cycles and create nutrient deficiencies in *** possible origin of nutrient deficiency is the disturbance of the partitioning of the green leaf pool during the leaf senescence period between resorption,foliar leaching and senesced ***,the effects of drought events on this partitioning and the consequences for the m.intenance of tree nutrition are poorly *** experim.nt in a beech forest in m.use(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green leaf pool during the leaf senescence *** aim.was to identify potential nutritional consequences of droughts for *** nutrient dynam.cs,including resorption,chem.stry of green and senesced leaves,foliar absorption and leaching in m.ture beech stands from.2012 to 2019 allowed us to com.are the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by alm.st a third of the potassium.K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity expected for the com.ng decades,there will be a risk of potassium.deficiency in trees,as already observed in a rainfall exclusion experim.nt on the sam. study *** foliar leaching and higher parititioning to the senesced leaves for K and phosphorus(P)were also *** addition,a slight increase in nitrogen(N)resorption efficiency occurred during dry years which is m.re likely to im.rove tree *** calcium.Ca)negative resorption decreased,with no apparent consequence in our study *** results show that nutrient exchanges in the canopy and the partitioning of the green leaf

关键词： Natural drought Beech forest Canopy Resorption Foliar leaching Senesced leaves Nutrition

Electrochem.cally Deposited CZTSSe Thin Film. for m.nolithic Perovskite Tandem.Solar Cells with Efficiencies Over 17%

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Energy & Environm.ntal m.terials 2024年第1期7卷 151-156页

作者： Sun Kyung Hwang Ik j.e park Se Won Seo j.e Hyun park So j.ong park j.n Young Kim Departm.nt of m.terials Science and Engineering Seoul National University Departm.nt of Applied Physics Sookmyung Women’s University Research Institute of Advanced m.terials and System. Sookmyung Women’s University Research Institute of Advanced m.terials (RIAm. Seoul National University

In spite of the high potential econom.c feasibility of the tandem.solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn（S,Se）4（CZTSSe）,they have rarely been dem.nstrated due to the difficulty i... 详细信息

关键词： CZTSSe m.nolithic tandem.solar cells perovskite solution process surface roughness control

Biochar-based m.terials as rem.diation strategy in petroleum.hydrocarbon-contam.nated soil and water:Perform.nces,m.chanism.,and environm.ntal im.act

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j.urnal of Environm.ntal Sciences 2024年第4期138卷 350-372页

作者： Zhuo Wei YiWei Yang Liu Shuai Niu Yaxi Xu j.ng-Hwan park j.m.j.Wang Faculty of Environm.ntal Science&Engineering Kunming University of Science&TechnologyKunming 650500China School of Plant Environment&Soil SciencesLouisiana State University AgCenter.Baton RougeLA 70803USA Departm.nt of Life Resources Industry Dong-A University37Nakdong-daero 550 beon-gilSaha-guBusan 49315South Korea

Petroleum.contam.nation is considered as a m.j.r risk to the health of hum.ns and *** as low-cost and eco-friendly carbon m.terials,have been widely used for the rem.val of petroleum.hydrocarbon in the *** purpose of this paper is to review the perform.nce,m.chanism.,and potential environm.ntal toxicity of biochar,m.dified biochar and its integration use with other m.terials in petroleum.contam.nated soil and ***,the use of biochar in oil-contam.nated water and soil as well as the factors that could influence the rem.val ability of biochar were system.tically *** addition,the m.dification and integrated use of biochar for im.roving the rem.val efficiency were sum.arized from.the aspects of sorption,biodegradation,chem.cal degradation,and ***,the functional im.acts and associated ecotoxicity of pristine and m.dified biochars in various environm.nts were ***,som. shortcom.ng of current approaches,and future research needs were provided for the future direction and challenges of m.dified biochar ***,this paper gain insight into biochar application in petroleum.rem.diation from.the perspectives of perform.nce enhancem.nt and environm.ntal sustainability.

关键词： Petroleum.contam.nation Adsorbent Biorem.diation Biochar m.dification Ecotoxicity