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1New development thoughts on the bio-inspired intelligence based control for unmanned combat aerial vehicle显示文摘Bio-inspired intelligence is in the spotlight in the field of international artificial intelligence,and unmanned combat aerial vehicle(UCAV),owing to its potential to perform dangerous,repetitive tasks in remote and hazardous,is very promising for the technological leadership of the nation and essential for improving the security of society.On the basis of introduction of bioinspired intelligence and UCAV,a series of new development thoughts on UCAV control are proposed,including artificial brain based high-level autonomous control for UCAV,swarm intelligence based cooperative control for multiple UCAVs,hy-brid swarm intelligence and Bayesian network based situation assessment under complicated combating environments, bio-inspired hardware based high-level autonomous control for UCAV,and meta-heuristic intelligence based heterogeneous cooperative control for multiple UCAVs and unmanned combat ground vehicles(UCGVs).The exact realization of the proposed new development thoughts can enhance the effectiveness of combat,while provide a series of novel breakthroughs for the intelligence,integration and advancement of future UCAV systems.DUAN HaiBin 1 ,SHAO Shan 2 ,SU BingWei 3 &ZHANG Lei 41 State Key Laboratory of Science and Technology on Holistic Flight Control,School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics,Beijing 100191,China 2 Flight Control Department,Shenyang Aircraft Design and Research Institute,Shenyang 110035,China 3 Beijing Institute of Near Space Vehicle’s System Engineering,Beijing 100076,China 4Integration and Project Section,Air Force Equipment Academy,Beijing 100085,China 2010Science China(Technological Sciences)2010,53,8:32
2Influence of Atmospheric Particulate Matter on Ozone in Nanjing,China:Observational Study and Mechanistic Analysis显示文摘Particulate matter with diameters of 2.5 μm or smaller(PM_(2.5)) and ozone(O_3) are major pollutants in the urban atmosphere. PM_(2.5) can affect O_3 by altering the photolysis rate and heterogeneous reactions. However, these two processes and their relative importance remain uncertain. In this paper, with Nanjing in China as the target city, we investigate the characteristics and mechanism of interactions between particles and O_3 based on ground observations and numerical modeling.In 2008, the average concentrations of PM_(2.5) and O_3 at Caochangmen station are 64.6 ± 47.4 μg m^(-3) and 24.6 ± 22.8 ppb,respectively, while at Pukou station they are 94.1 ± 63.4 μg m^(-3) and 16.9 ± 14.9 ppb. The correlation coefficient between PM_(2.5) and O_3 is -0.46. In order to understand the reaction between PM_(2.5) and O_3, we construct a box model, in which an aerosol optical property model, ultraviolet radiation model, gas phase chemistry model, and heterogeneous chemistry model,are coupled. The model is employed to investigate the relative contribution of the aforementioned two processes, which vary under different particle concentrations, scattering capability and VOCs/NOxratios(VOCs: volatile organic compounds;NOx: nitric oxide and nitrogen dioxide). Generally, photolysis rate effect can cause a greater O_3 reduction when the particle concentrations are higher, while heterogeneous reactions dominate O_3 reduction with low-level particle concentrations.Moreover, in typical VOC-sensitive regions, O_3 can even be increased by heterogeneous reactions. In Nanjing, both processes lead to O_3 reduction, and photolysis rate effect is dominant. Our study underscores the importance of photolysis rate effect and heterogeneous reactions for O_3, and such interaction processes should be fully considered in future atmospheric chemistry modeling.Yawei QU Tijian WANG Yanfeng CAI Shekou WANG Pulong CHEN Shu LI Mengmeng LI Cheng YUAN Jing WANG Shaocai XU 2018Advances in Atmospheric Sciences2018,35,11:33
3The state-of-the-art synthetic strategies for SAPO-34 zeolite catalysts in methanol-to-olefin conversion显示文摘Methanol-to-olefin(MTO)conversion has proven to be one of the most successful non-petrochemical routes for producing light olefins.Silicoaluminophosphate(SAPO)zeolite SAPO-34 is one of the best industrial catalysts for MTO conversion,but suffers from rapid deactivation due to the inherent diffusion bottleneck limited by the narrow eight-ring pore openings.To improve the MTO performance,considerable synthetic efforts have been devoted to decrease the crystal size of zeolites or introduce secondary larger pores in zeolite crystals to form hierarchical structures.This review mainly focuses on presenting the state-of-the-art synthetic strategies for nanosized and hierarchical SAPO-34 catalysts with excellent MTO performance.Furthermore,the industrialization of SAPO-34 catalysts for the MTO reaction,and some current problems and future prospects for the synthesis of SAPO-34 catalysts,are also pointed out.We expect that this review can not only shed some light on the preparation of SAPO-34 catalysts,but also stimulate the future development of high-performance SAPO-34 catalysts to meet the increasing demands of the chemical industry.Qiming Sun Zaiku Xie Jihong Yu 2018National Science Review2018,5,4:22
4Review on photocatalytic and electrocatalytic artificial nitrogen fixation for ammonia synthesis at mild conditions: Advances,challenges and perspectives显示文摘The ammonia synthesis from nitrogen and water under ambient conditions is one of the most inviting but challenging reaction routes.Although nitrogen is abundant in the atmosphere and the ammonia synthesis reaction is exothermic on the thermodynamics,the conversion of N2 to ammonia is actually hard to proceed owing to the chemical inertness and stability of N2 molecules.In industry,ammonia synthesis is carried out by the Haber-Bosch process under harsh conditions (300-500 ℃,20-30 MPa) associated with the requirement of substantial energy input and the enormous emission of greenhouse gases (e.g.,CO2).Recently,a growing number of studies on photo(electro)catalytic and electrocatalytic nitrogen reduction reaction (NRR) in aqueous solution have attracted extensive attention,which holds great promise for nitrogen fixation under room temperature and atmospheric pressure.However,the very low efficiency and ambiguous mechanism still remain as the major hurdles for the development of photochemical and electrochemical NRR systems.Here we provide an overview of the latest progresses,remaining challenges and future prospects in photocatalytic and electrocatalytic nitrogen fixation.Moreover,this review offers a helpful guidance for the reasonable design of photocatalysts and electrocatalysts towards NRR by combining theory predictions and experiment results.We hope this review can stimulate more research interests in the relatively understudied but highly promising research field of NRR.Xiaolan Xue Renpeng Chen Changzeng Yan Peiyang Zhao Yi Hu Wenjun Zhang Songyuan Yang Zhong Jin 2019Nano Research2019,12,6:20
5Unmanned air/ground vehicles heterogeneous cooperative techniques:Current status and prospects显示文摘Multiple unmanned air/ground vehicles heterogeneous cooperation is a novel and challenging filed.Heterogeneous cooperative techniques can widen the application fields of unmanned air or ground vehicles,and enhance the effectiveness of implementing detection,search and rescue tasks.This paper mainly focused on the key issues in multiple unmanned air/ground vehicles heterogeneous cooperation,including heterogeneous flocking,formation control,formation stability,network control,and actual applications.The main problems and future directions in this field were also analyzed in detail.These innovative technologies can significantly enhance the effectiveness of implementing complicated tasks,which definitely provide a series of novel breakthroughs for the intelligence,integration and advancement of future robot systems.DUAN HaiBin & LIU SenQi National Key Laboratory of Science and Technology on Holistic Flight Control,School of Automation Science and Electrical Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China 2010Science China(Technological Sciences)2010,53,5:16
6Theoretical understanding of the stability of single-atom catalysts显示文摘As a new frontier,the rapid development of single-atom catalysts (SACs)in heterogeneous catalysis has attracted extensive attention since the concept of singleatom catalysis was first coined in 2011 [1,2].Supported metal single atoms usaally possess unique chemical and physical properties and have a special local chemical environment that is distinctly different from conventional supported nanoparticles and metal catalysts. Studies in the past several years have shown four main advantages of SACs: high selectivity,possibly high stability, high atomic efficiency and tunable high activity,as shown in Fig.1.For efficiency.Jin-Cheng Liu Yan Tang Yang-Gang Wang Tao Zhang Jun Li 2018National Science Review2018,5,5:15
7Single-atom catalyst: a rising star for green synthesis of fine chemicals显示文摘The green synthesis of fine chemicals calls for a new generation of efficient and robust catalysts. Single-atom catalysts(SACs), in which all metal species are atomically dispersed on a solid support, and which often consist of well-defined mononuclear active sites, are expected to bridge homogeneous and heterogeneous catalysts for liquid-phase organic transformations. This review summarizes major advances in the SAC-catalysed green synthesis of fine chemicals in the past several years, with a focus on the catalytic activity, selectivity and reusability of SACs in various organic reactions. The relationship between catalytic performance and the active site structure is discussed in terms of the valence state, coordination environment and anchoring chemistry of single atoms to the support, in an effort to guide the rational design of SACs in this special area, which has traditionally been dominated by homogeneous catalysis.Finally, the challenges remaining in this research area are discussed and possible future research directions are proposed.Leilei Zhang Yujing Ren Wengang Liu Aiqin Wang Tao Zhang 2018National Science Review2018,5,5:15
8Encapsulating soluble active species into hollow crystalline porous capsules beyond integration of homogeneous and heterogeneous catalysis显示文摘Homogeneous molecular catalysts and heterogeneous catalysts possess complementary strengths,and are of great importance in laboratory/commercial procedures.While various porous hosts,such as polymers,carbons,silica,metal oxides and zeolites,have been used in an attempt to heterogenize homogeneous catalysts,realizing the integration of both functions at the expense of discounting their respective advantages,it remains a significant challenge to truly combine their intrinsic strengths in a single catalyst without compromise.Here,we describe a general template-assisted approach to incorporating soluble molecular catalysts into the hollow porous capsule,which prevents their leaching due to the absence of large intergranular space.In the resultant yolk(soluble)–shell(crystalline)capsules,the soluble yolks can perform their intrinsic activity in a mimetic homogeneous environment,and the crystalline porous shells endow the former with selective permeability,substrate enrichment,size-selective and heterogeneous cascade catalysis,beyond the integration of the respective advantages of homogeneous and heterogeneous catalysts.Guorui Cai Meili Ding Qianye Wu Hai-Long Jiang 2020National Science Review2020,7,1:12
9Consensus Problem of Heterogeneous Multi-agent Systems with Time Delay under Fixed and Switching Topologies显示文摘Consensus problem is investigated for heterogeneous multi-agent systems composed of first-order agents and second-order agents in this paper. Leader-following consensus protocol is adopted to solve consensus problem of heterogeneous multi-agent systems with time-varying communication and input delays. By constructing Lyapunov-Krasovkii functional, sufficient consensus conditions in linear matrix inequality(LMI) form are obtained for the system under fixed interconnection topology. Moreover, consensus conditions are also obtained for the heterogeneous systems under switching topologies with time delays. Simulation examples are given to illustrate effectiveness of the results.Ping-Ping Dai Cheng-Lin Liu Fei Liu 2014International Journal of Automation and computing2014,11,3:11
10Development of the universal and simplified soil model coupling heat and water transport显示文摘It is very important to develop a universal soil model with higher simplicity and more accuracy, which can be widely applied to very general cases such as wet or dry soil, frozen or unfrozen soil and homogeneous or heterogeneous soil. Firstly in this study, based on analysis of both magnitude order and the numerical simulation results, the universal and simplified soil model (USSM) coupling heat and mass transport processes is developed. Secondly, in order to avoid the greater uncertainty caused by the phase change term in numerical iteration process for the model solution obtaining, new version of the universal simplified soil model (NUSSM) is further derived through variables transformation, and accordingly a more efficient numerical scheme for the new version is designed well. The simulation results from the NUSSM agree with the results from more complicated and accurate soil model very well, also reasonably reproduce the observed data under widely real conditions. The new version model, because of its simplicity, will match for the development of land surface model.LI Qian1,2 & SUN ShuFen1 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 2008Science China Earth Sciences2008,51,1:11
11Heterogeneous molecular catalysts for electrocatalytic CO2 reduction显示文摘This review provides an overview of the literature regarding heterogeneous molecular catalysts for electrochemical CO2 reduction (ECR).Fundamental aspects of the science,including aggregation,electrochemical rate laws,and electrode-catalyst electronic coupling,are discussed to provide a solid foundation on which to design experiments and interpret results.Mechanistic aspects of ECR are presented based on electrokinetic and spectroscopic measurements as well as density functional theory (DFT) calculations.Consensus is improving for electrokinetic measurements,but the redox state of the metal center under reaction conditions and DFT reaction pathways lack agreement in the literature.Concerning the tunable aspects of the molecular catalyst,the impacts of the metal center,ligand substituents,and electrode support on the activity and selectivity toward ECR are presented with an emphasis on those studies that controlled for aggregation and minimized mass-transport limitations.Extended three-dimensional (3D) structures such as polymers,metal-organic frameworks (MOFs),and covalent-organic frameworks (COFs) are discussed as highly tunable architectures that begin to mimic the catalytic pockets of enzyme active sites.To achieve the full potential of these catalysts,design principles must emerge based on a combination of deconvoluting measurements to extract intrinsic catalyst properties and more reliable theoretical calculations to predict reaction pathways.Nathan Corbin Joy Zeng Kindle Williams Karthish Manthiram 2019Nano Research2019,12,9:10
12Laser-driven programmable non-contact transfer printing of objects onto arbitrary receivers via an active elastomeric microstructured stamp显示文摘Transfer printing, as an important assembly technique, has attracted much attention due to its valuable merits to develop novel forms of electronics such as stretchable inorganic electronics requiring the heterogeneous integration of inorganic materials with soft elastomers. Here, we report on a laser-driven programmable non-contact transfer printing technique via a simple yet robust design of active elastomeric microstructured stamp that features cavities filled with air and embedded under the contacting surface, a micro-patterned surface membrane that encapsulates the air cavities and a metal layer on the inner-cavity surfaces serving as the laser-absorbing layer. The micro-patterned surface membrane can be inflated dynamically to control the interfacial adhesion, which can be switched from strong state to weak state by more than three orders of magnitude by local laser heating of the air in the cavity with a temperature increase below 100℃. Theoretical and experimental studies reveal the fundamental aspects of the design and fabrication of the active elastomeric microstructured stamp and the operation of non-contact transfer printing. Demonstrations in the programmable transfer printing of micro-scale silicon platelets and micro-scale LED chips onto various challenging receivers illustrate the extraordinary capabilities for deterministic assembly that are difficult to address by existing printing schemes, thereby creating engineering opportunities in areas requiring the heterogeneous integration of diverse materials such as curvilinear electronics and Micro LED displays.Hongyu Luo Chengjun Wang Changhong Linghu Kaixin Yu Chao Wang Jizhou Song 2020National Science Review2020,7,2:9
13Heterogeneous reactions of sulfur dioxide on dust显示文摘The source of urban atmospheric particles is broad, and the major source is the building dust from urban construction. Calcium is the tagged element and Portland cement is the major com- ponent of building dust. In this study, CaO was regarded as the representative oxide of building dust, and mixtures were synthesized in terms of the major element ingredients of building dust. The het- erogeneous uptake of SO2 on CaO, mixtures, Portland cement and building dust samples was inves- tigated. In situ FTIR and X-ray photoelectron spectroscopy (XPS) were used to identify the products of the reactions. In addition, the crystal phases and the surface properties of the samples were charac- terized by XRD patterns and BET specific surface area. The results show that in the presence of oxygen, sulfur dioxide can be adsorbed to sulfite and further catalytically oxidized to sulfate on the surface of CaO, the mixtures, Portland cement and building dust. The reactivity of SO2 on the surface of dust and oxides is basically a first order. The main ingredient of building dust sample is SiO2, and the one of Portland cement is Ca3SiO5.GAO Yunchuan CHEN Dan 2006Science China Chemistry2006,49,3:9
14Heterogeneous reaction of NO_2 on the surface of NaCl particles显示文摘The heterogeneous reaction of NO2 on NaCl particles has been investigated with the new sample preparation and the mode of gas-solid free diffusion. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) is used to characterize the adsorbed products in situ, combined with Ion Chromatographic (IC), X-ray Photoelectron Spectroscopy (XPS) and Scan Electron Micros- copy (SEM). Our results indicate that the reaction is not limited to the surface of the NaCl particles, but penetrated into the upper layers. Surface reactive sites determine the reaction. Kinetic measurements show that nitrate formation on sodium chloride is second order in NO2 concentration and reactive uptake coefficient is (1.54 ± 0.70) × 10?5.LI Hongjun ZHU Tong DING Jie CHEN Qi XU Bingye 2006Science China Chemistry2006,49,4:9
15Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis显示文摘To restore the natural nitrogen cycle(N-cycle),artificial N-cycle electrocatalysis with flexibility,sustainability,and compatibility can convert intermittent renewable energy(e.g.,wind)to harmful or value-added chemicals with minimal carbon emissions.The background of such N-cycles,such as nitrogen fixation,ammonia oxidation,and nitrate reduction,is briefly introduced here.The discussion of emerging nanostructures in various conversion reactions is focused on the architecture/compositional design,electrochemical performances,reaction mechanisms,and instructive tests.Energy device advancements for achieving more functions as well as in situ/operando characterizations toward understanding key steps are also highlighted.Furthermore,some recently proposed reactions as well as less discussed C-N coupling reactions are also summarized.We classify inorganic nitrogen sources that convert to each other under an applied voltage into three types,namely,abundant nitrogen,toxic nitrate(nitrite),and nitrogen oxides,and useful compounds such as ammonia,hydrazine,and hydroxylamine,with the goal of providing more critical insights into strategies to facilitate the development of our circular nitrogen economy.Jie Liang Qian Liu Abdulmohsen Ali Alshehri Xuping Sun 2022Nano Research Energy2022,1,2:8
16Heterogeneous reaction of SO_2 on TiO_2 particles显示文摘The heterogeneous reaction of SO2 on TiO2 particles was studied using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS).The influences of the oxygen concentration,relative humidity (RH),and ultraviolet (UV) light illumination (λ=365 nm) intensity on the reaction were investigated.The main product of the heterogeneous reaction of SO2 on TiO2 particles was sulfate with UV illumination and sulfite without it.The production of sulfate was promoted significantly with UV illumination or water,and there was a synergistic effect when both were present.In the dry system without UV,the heterogeneous reaction of SO2 on TiO2 particles was found to be second-order for SO2 and the initial uptake coefficient,BET,was determined to be 1.94 × 10-6.With UV and RH=40%,the reaction order was first-order and the initial uptake coefficient was 1.35 × 10-5.SHANG Jing,LI Jia & ZHU Tong State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China 2010Science China Chemistry2010,53,12:8
17Sulfur isotopic composition and source identification of atmospheric environment in central Zhejiang,China显示文摘Sulfur dioxide and sulfate aerosols in the atmosphere are significant factors leading to acidification of the atmospheric environment and worsening the pollution of acid deposition. Because of the 'fingerprint' characteristics of the stable sulfur isotopic composition, sulfur isotope has been widely adopted in environmental researches concerning sulfur cycle and source identification. In this study, the atmospheric environment of Jinhua City, central Zhejiang Province, was continuously monitored, and the sulfur isotopic composition of SO2 and sulfate aerosols in the atmosphere was analyzed. The results indicate that the variation of δ34S values for SO2 ranges from 1.0‰ to 7.5‰, and annual average is 4.7‰±2.3‰, whereas that of sulfate aerosols ranges from 6.4‰ to 9.8‰,and annual average is 8.1‰±1.0‰. The δ 34S values for SO2 have significant seasonal variations, which are 7.0‰ in winter and 3.3‰ in summer. These variations cannot be attributed to a single factor, and we suggest a temperature-dependent isotope equilibrium fractionation and elevated biogenic sulfur emissions of isotopically light S in summer may be the main controlling mechanisms. Furthermore, we also discuss the δ 34S model of atmospheric SO2 oxidation to form sulfate, and suggest that heterogeneous oxidation dominates in the oxidation reactions of atmospheric SO2 in the central Zhejiang Province. We further suggest that the relative humidity in the atmosphere plays an important role in the oxidation mechanism of atmospheric SO2.Zhang MiaoYun Wang ShiJie Ma GuoQiang Zhou HuaiZhong Fu Jun 2010Science China Earth Sciences2010,53,11:8
18Heterogeneous reactions of gaseous methanesulfonic acid with NaCl and sea salt particles显示文摘Methanesulfonic acid(MSA) has been identified as one of the most important intermediate products of DMS reactions in the atmosphere.Although considerable amounts of MSA have been found in the ma-rine boundary layer,little is known about the interaction of gaseous MSA with sea salt particles.To understand the fate of MSA in the atmosphere and its potential importance in atmospheric chemistry,the heterogeneous reactions of gaseous MSA with micron-scale NaCl and sea salt particles were studied using diffuse reflectance infrared Fourier transform spectrometry,X-ray photoelectron spectroscopy,and scanning electron microscopy.The CH3SO3Na and CH3SO3-were the major products of the condensed phase of the reaction of gaseous MSA with NaCl and with sea salt particles.The steady-state uptake coefficient was determined to be(5.94±2.32)×10-7(1 σ) for the reaction of gaseous MSA with NaCl particles and(2.23±1.25)×10-7(1 σ) for the reaction of gaseous MSA with sea salt parti-cles.The heterogeneous reaction of MSA with NaCl particles was found to be first-order for MSA.The reaction mechanisms were discussed.TANG MingJin ZHU Tong 2009Science China Chemistry2009,52,1:7
19Influence of heterogeneity on rock strength and stiffness using discrete element method and parallel bond model显示文摘The particulate discrete element method(DEM) can be employed to capture the response of rock,provided that appropriate bonding models are used to cement the particles to each other.Simulations of laboratory tests are important to establish the extent to which those models can capture realistic rock behaviors.Hitherto the focus in such comparison studies has either been on homogeneous specimens or use of two-dimensional(2D) models.In situ rock formations are often heterogeneous,thus exploring the ability of this type of models to capture heterogeneous material behavior is important to facilitate their use in design analysis.In situ stress states are basically three-dimensional(3D),and therefore it is important to develop 3D models for this purpose.This paper revisits an earlier experimental study on heterogeneous specimens,of which the relative proportions of weaker material(siltstone) and stronger,harder material(sandstone) were varied in a controlled manner.Using a 3D DEM model with the parallel bond model,virtual heterogeneous specimens were created.The overall responses in terms of variations in strength and stiffness with different percentages of weaker material(siltstone) were shown to agree with the experimental observations.There was also a good qualitative agreement in the failure patterns observed in the experiments and the simulations,suggesting that the DEM data enabled analysis of the initiation of localizations and micro fractures in the specimens.Spyridon Liakas Catherine O’Sullivan Charalampos Saroglou 2017Journal of Rock Mechanics and Geotechnical Engineering2017,9,4:7
20Identification of charging behavior characteristic for large-scale heterogeneous electric vehicle fleet显示文摘This paper aims to accurately identify parameters of the natural charging behavior characteristic(NCBC)for plug-in electric vehicles(PEVs) without measuring any data regarding charging request information of PEVs. To this end, a data-mining method is first proposed to extract the data of natural aggregated charging load(ACL) from the big data of aggregated residential load. Then, a theoretical model of ACL is derived based on the linear convolution theory. The NCBC-parameters are identified by using the mined ACL data and theoretical ACL model via the derived identification model. The proposed methodology is cost-effective and will not expose the privacy of PEVs as it does not need to install sub-metering systems to gather charging request information of each PEV. It is promising in designing unidirectional smart charging schemes which are attractive to power utilities. Case studies verify the feasibility and effectiveness of the proposed methodology.Peng LIU Jilai YU 2018Journal of Modern Power Systems and Clean Energy2018,6,3:7
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