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Radio core dominance of Fermi/LAT-detected AGNs

Science China(Physics,Mechanics & Astronomy) 2020年第5期63卷 105-123页

作者： ZhiYuan Pei JunHui Fan Denis Bastieri JiangHe yang HuBing xiao Diparimento di Fisica e Astronomia“G.Galilei”.Universita di Padova Padova 1-35131Italy Istituto Nazionale di Fisica Nucleare Sezione di PadovaPadova 1-35131Italy Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Astronomy Science and Technology Research Laboratory of Department of education of Guangdong Province Guangzhou 510006China Department of Physics and electronics Science Hunan University of Arts and ScienceChangde 415000China

We present a sample of 4388 AGNs with available radio core-dominance parameters—defined as the ratio of the core flux densities to the extended ones, R = S_(core)/S_(ext).—which includes 630 Fermi-detected AGNs from the fourth source catalog(4FGL) of the Fermi Large Area Telescope(Fermi/LAT);the rest are non-Fermi-detected AGNs. In our sample, 584 blazars are Fermi-detected and 1310 are not. The sample also contains other subclasses, such as Seyferts, Fanaroff-Riley I/II galaxies, and normal *** investigate various properties of the Fermi-detected and non-Fermi-detected AGNs by using core-dominance parameters,capitalizing on a previous study which showed that R is a good indicator of beaming. We then calculate radio spectral indices for the whole sample, and adopt γ-ray-photon indices for the Fermi AGNs from the 4FGL catalog to discuss the properties of different subclasses. We obtain a relation between the core-dominance parameters and the radio spectral indices for both Fermi and non-Fermi sources, assuming a two-component model in the radio band. Our previous study ruled out the assumption that the core-dominance parameters and radio spectral indices are quite different for different AGN subclasses. This holds not only for Fermi sources but also for non-Fermi sources. In particular, R is, on average, greater for the former AGNs than for the *** this study, we enlarge our sample with available values of R to 4388 AGNs, and the obtained conclusions are consistent with our previous study. We assume that the same two-component model holds for the γ-ray band as for the radio band, and therefore,adopt the same relation between the core-dominance parameters and the γ-ray-photon indices for Fermi AGNs. Our fitting results indicate that the γ-ray emissions of Fermi blazars originate mainly from the jet, and therefore, we conclude that the Fermi blazars are beamed.

关键词： active galactic nuclei(AGNs) quasars γ-rays

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Perceived Utility of Premium Power by High-tech Manufacturers

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Journal of Modern Power Systems and Clean energy 2020年第2期8卷 287-295页

作者： Yuanqian Ma Xianyong xiao yang Wang Ying Wang Zixuan Zheng College of electrical engineering and Information Technology Sichuan UniversityChengduChinaand she is also with the Faculty of Mechanical Engineering&AutomationZhejiang Sci-Tech UniversityHangzhouChina College of electrical engineering and Information Technology Sichuan UniversityChengduChina

The valuation of premium power based on perceived utility(PU,i.e.,perceived effectiveness or satisfaction degree of customers)and their willingness to pay has been researched for *** of the remaining challenges is the accurate evaluation of *** is the foundation of premium power evaluation,and it is essential for the decision-making process of investments on premium power by high-tech manufacturers(HTMs).This paper presents a framework to effectively evaluate *** this framework,factors influencing PU were classified to be quantitative and *** indication system(IS)was then constructed based on those influencing ***,PU was evaluated by the IS,considering psychological perception and decision-making behavior of *** effectiveness of the proposed PU-evaluation framework was demonstrated through field case studies.

关键词： Premium power voltage sag perceived utility influencing factors indication system

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Facile fabrication of highly conductive, waterproof, and washable e-textiles for wearable applications

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Nano Research 2021年第4期14卷 1043-1052页

作者： Ben Niu Su yang Tao Hua xiao Tian MingKin Koo Nanotechnology Center Institute of Textiles&ClothingThe Hong Kong Polytechnic UniversityHung HornHong Kong 999077China

曰ectronic textiles(e-textiles),known as a newly-developed innovation combining the textile and electronic technologies,are burgeoning as the next-generation of wearable electronics for lots of promising ***,a big concern is the durability of the e-textiles during practical ***,we describe a facile method tofabricate mechanically and electrically durable e-textiles by chemical deposition of silver nanoparticles(AgNPs)on widely used cotton *** interface between AgNPs and fabric was tightly strengthened by the bioinspired polydopamine,and a highly waterproof and anticorrosive surface was further obtained by modifying with a fluorine containing agent of 1H,1H,2H,2/~/-perfuorodecanethiol(PFDT).In addition to the low sheet resistance of 0.26 ohm/sq and high conductivity of 233.4 S/cm,the e-textiles present outstanding stability to different mechanical deformations including ultrasonication,bending and machine ***,thanks to the surface roughness of AgNPs and low surface energy of PFDT,a superhydrophobic surface,with a water contact angle of ca.152°,was further obtained,endowing the e-textiles excellent anti-corrosion to water,acid/alkaline solution and various liquids(e.g.,milk,coffee and tea).Finally,the application of this highly conductive e-textiles in wearable thermal therapy is *** with the facile,all-solution-based,and environmentally friendly fabrication protocol,the e-textiles show great potential of large-scale applications in wearable electronics.

关键词： electronic textiles silver nanoparticles washability waterproof

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Active MoS_(2)-based electrode for green ammonia synthesis

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Chinese Journal of Chemical engineering 2024年第1期65卷 268-275页

作者： Xin Liu Lei yang Tao Wei Shanping Liu Beibei xiao School of energy and Power engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Institute Charles Gerhardt Montpellier UMR-5253Universite de MontpellierCNRSENSCMPlace E.Bataillon34095 Montpellier Cedex 05France

Nitrogen electro-reduction under mild conditions is one promising alternative approach of the energyconsuming Haber-Bosch process for the artificial ammonia *** critical aspect to unlocking this technology is to discover the catalysts with high selectivity and *** this work,the N_(2)-to-NH_(3)conversion on the functional MoS_(2)is fully investigated by density functional theory calculations since the layered MoS_(2)provides the ideal platform for the elaborating copies of the nitrogenase found in nature,wherein the functionalization is achieved via basal-adsorption,basal-substitution or edge-substitution of transition metal *** results reveal that the edge-functionalization is a feasible strategy for the activity promotion;however,the basal-adsorption and basal-substitution separately suffer from the electrochemical instability and the NRR ***,MoS_(2)functionalized via edge W-substitution exhibits an exceptional *** energetically favored reaction pathway is through the distal pathway and a limiting potential is less than 0.20 ***,this work escalates the rational design of the high-effective catalysts for nitrogen fixation and provides the explanation why the predicated catalyst have a good performance,paving the guidance for the experiments.

关键词： Nitrogen reduction reaction Density functional theory calculations Molybdenum disulfide electrochemistry Catalyst Thermodynamics

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Particle segregation mechanism of S–D system in a rotating drum

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Particuology 2024年第10期93卷 300-308页

作者： erliang xiao Wei Zhang Zhipeng Chi Ran Li Hui yang School of Optical-electricaland Computer engineering University of Shanghai for Science and Technology Shanghai 200093China Collegeof Medical Instrumentation Shanghai University of Medicine&Health SciencesShanghaiChina

Complex segregation occurs in a binary particle system with differing particle sizes and densities,particularly when the larger particles are heavier(S–D system,i.e.,size minus density system).Predicting the segregation pattern driven by multiple mechanisms simultaneously is often *** study explores the segregation mechanisms in a quasi-2D circular drum containing a S–D system,realizing a transition between the S-core and Core-and-band patterns by adjusting the drum rotation *** the transition of the segregation pattern,only the S-core pattern chiefly driven by the percolation mechanism is initially *** the rotation speed increases,the buoyancy mechanism and particle diffusion gradually strengthen,jointly driving the formation of the Core-and-band pattern.A dimensionless strength ratio,λ=H/h,where H and h respectively represent the diffusion and buoyancy strengths at length scales,is introduced to elucidate this *** Core-and-band pattern emerges whenλreached 1.4.

关键词： Particle segregation S-Dsystem Segregationmechanisms competition Segregation pattern Rotating drum

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Cu/Pd-catalyzed borocarbonylative trifunctionalization of alkynes and allenes:synthesis ofβ-geminal-diboryl ketones

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Science China Chemistry 2021年第12期64卷 2142-2153页

作者： yang Yuan Fu-Peng Wu Anke Spannenberg xiao-Feng Wu Leibniz-Institut für Katalyse e.V.an der Universität Rostock Albert-Einstein-Straβe 29a18059RostockGermany Dalian National Laboratory for Clean energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

Functionalized bisboryl compounds have recently emerged as a new class of synthetically useful building blocks in organic ***,we report an efficient strategy to synthesizeβ-geminal-diboryl ketones enabled by a Cu/Pd-catalyzed borocarbonylative trifunctionalization of readily available alkynes and *** reaction promises to be a useful method for the synthesis of functionalizedβ-geminal-diboryl ketones with broad functional group *** studies suggest that the reaction proceeds through borocarbonylation/hydroboration cascade of both alkynes and allenes.

关键词： carbonylation copper/palladium alkynes/allenes trifunctionalization β-geminal-diboryl ketones

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Maize-legume intercropping promote N uptake through changing the root spatial distribution,legume nodulation capacity,and soil N availability

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Journal of Integrative Agriculture 2022年第6期21卷 1755-1771页

作者： ZHeNG Ben-chuan ZHOU Ying CHeN Ping ZHANG xiao-na DU Qing yang Huan WANG xiao-chun yang Feng xiao Te LI Long yang Wen-yu YONG Tai-wen College of Agronomy Sichuan Agricultural UniversityChengdu 611130P.R.China Sichuan engineering Research Center for Crop Strip Intercropping System/Key Laboratory of Crop ecophysiology and Farming System in Southwest Ministry of Agriculture and Rural AffairsChengdu 611130P.R.China College of Resources and environmental Sciences China Agricultural UniversityBeijing100093P.R.China

Legume cultivars affect N uptake,component crop growth,and soil physical and chemical characteristics in maize-legume intercropping ***,how belowground interactions mediate root growth,N fixation,and nodulation of different legumes to affect N uptake is still ***,a two-year experiment was conducted with five planting patterns,i.e.,maize-soybean strip intercropping(IMS),maize-peanut strip intercropping(IMP),and corresponding monocultures(monoculture maize(MM),monoculture soybean(MS),and monoculture peanut(MP)),and two N application rates,i.e.,no N fertilizer(N-)and conventional N fertilizer(N+),to examine relationships between N uptake and root distribution of crops,legume nodulation and soil N *** showed that the averaged N uptake per unit area of intercrops was significantly lower than the corresponding *** with the monoculture system,the N uptake of the intercropping systems increased by 31.7-45.4%in IMS and by 7.4-12.2%in IMP,*** N uptake per plant of intercropped maize and soybean significantly increased by 61.6 and 31.8%,and that of intercropped peanuts significantly decreased by 46.6%compared with the corresponding *** and soybean showed asymmetrical distribution of roots in strip intercropping *** root length density(RLD)and root surface area density(RSAD)of intercropped maize and soybean were significantly greater than that of the corresponding *** roots of intercropped peanuts were confined,which resulted in decreased RLD and RSAD compared with the *** nodule number and nodule fresh weight of soybean were significantly greater in IMS than in MS,and those of peanut were significantly lower in IMP than in *** soil protease,urease,and nitrate reductase activities of maize and soybean were significantly greater in IMS and IMP than in the corresponding monoculture,while the enzyme activities of peanut were significantly lower in IMP than in MP

关键词： maize-legume strip intercropping nitrogen uptake soil enzyme activity soil available nitrogen root length density

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Metal to Orthogonal Metal Transition

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Chinese Physics Letters 2020年第4期37卷 114-120页

作者： Chuang Chen xiao Yan Xu yang Qi Zi yang Meng Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190 Department of Physics Hong Kong University of Science and TechnologyClear Water BayHong Kong Department of Physics University of California at San DiegoLa JollaCalifornia 92093USA Center for Field Theory and Particle Physics Department of PhysicsFudan UniversityShanghai 200433 State Key Laboratory of Surface Physics Fudan UniversityShanghai 200433 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics The University of Hong KongPokfulam RoadHong Kong Songshan Lake Materials Laboratory Dongguan 523808

Orthogonal metal is a new quantum metallic state that conducts electricity but acquires no Fermi surface(FS)or quasiparticles, and hence orthogonal to the established paradigm of Landau’s Fermi-liquid(FL). Such a state may hold the key of understanding the perplexing experimental observations of quantum metals that are beyond FL, i.e., dubbed non-Fermi-liquid(nFL), ranging from the Cu-and Fe-based oxides, heavy fermion compounds to the recently discovered twisted graphene heterostructures. However, to fully understand such an exotic state of matter, at least theoretically, one would like to construct a lattice model and to solve it with unbiased quantum many-body machinery. Here we achieve this goal by designing a 2D lattice model comprised of fermionic and bosonic matter fields coupled with dynamic Z2 gauge fields, and obtain its exact properties with sign-free quantum Monte Carlo simulations. We find that as the bosonic matter fields become disordered, with the help of deconfinement of the Z2 gauge fields, the system reacts with changing its nature from the conventional normal metal with an FS to an orthogonal metal of n FL without FS and quasiparticles and yet still responds to magnetic probe like an FL. Such a quantum phase transition from a normal metal to an orthogonal metal, with its electronic and magnetic spectral properties revealed, is calling for the establishment of new paradigm of quantum metals and their transition with conventional ones.

关键词： quantum Fermi gauge

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Biliary cystadenocarcinoma diagnosed with real-time contrast-enhanced ultrasonography:Report of a case with diagnostic features

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World Journal of Gastroenterology 2010年第1期16卷 131-135页

作者： Ren, xiao-Long Yan, Rui-Ling Yu, xiao-Hui Zheng, Ying Liu, Jun-e Hou, xiao-Bin Zuo, Si-yang Fu, xiao-Yan Chang, Hong Lu, Jian-Hong Gen Hosp Lanzhou Mil Area Command Dept Ultrasonog Lanzhou 730050 Gansu Peoples R China

Biliary cystadenocarcinoma is a very rare malignant cystic tumor of the liver,which is often misdiagnosed due to a poor recognition of *** report a case of a 60-year-old man with biliary cystadenocarcinoma with his real time contrast enhanced ultrasound(CeUS)characteristics compared to those of computed tomography(CT)and magnetic resonance imaging(MRI),which were correlated with the surgical and pathologic *** wall enhancement,internal septations and intra-cystic solid portions in the arterial phase were observed on CeUS after contrast agent *** enhancement was washed out progressively and depicted as hypo-enhancement in the portal and late *** revealed a large irregular cystic lesion in the left liver lobe with no clear septations and solid *** showed an irregular cystic occupying lesion with septations.

关键词： Biliary cystadenocarcinoma Cystic neoplasm Hepatic disease Contrast medium Ultrasonography

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Role of hydrogen sulfide in portal hypertension and esophagogastric junction vascular disease

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World Journal of Gastroenterology 2014年第4期20卷 1079-1087页

作者： Chao Wang Juan Han Liang xiao Chang-e Jin Dong-Jian Li Zhen yang Department of General Surgery Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Department of Biliary and Pancreatic Surgery Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Department of Surgery and Biological Therapy Shenzhen Second People’s Hospital the First Affiliated Hospital of Shenzhen University Department of Respiratory Medicine Shenzhen People’s Hospital

AIM: To investigate the association between endogenous hydrogen sulfide (H2S) and portal hypertension as well as its effect on vascular smooth muscle cells.

关键词： Portal hypertension, Apoptosis, B-cell lymphoma-2, B-cell lymphoma-XL, Cystathionine γ -lyase, peRK 1/2, Hydrogen sulfide

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