检索结果-南通市图书馆

Multi-feedback Pairwise Ranking via Adversarial Training for Recommender

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第4期29卷 615-622页

作者： wang jianfang FU Zhiyuan NIU Mingxin ZHANG Pengbo ZHANG Qiuling College of Computer Science and Technology Henan Polytechnic University

Personalized recommendation systems predict potential demand by analyzing user ***, user feedback information is inferred from implicit feedback or explicit ***,feedback can be contaminated by user's mis-operations or malicious operations, and may thus lead to incorrect *** propose a novel Multi-feedback pairwise ranking method via Adversarial training(AT-MPR) for recommender to enhance the robustness and overall performance in the event of rating *** MPR method extends Bayesian personalized ranking(BPR) to cover three types of feedback: positive, negative, and *** obtains user preferences in a probabilistic way through multiple feedbacks at different *** reduce the impact of feedback noise, we train an MPR objective function using minimax adversarial *** on two datasets show that the AT-MPR model achieves satisfactory performance and outperforms the state-of-the-art implicit feedback collaborative ranking models in two evaluation metrics.

关键词： Adversarial training Pairwise ranking Collaborative filtering Recommender system

Dynamic analysis of preferential orientation of aragonite crystals in nacre from mollusk shell

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第24期52卷 3452-3456页

作者： ZHANG XueAo WU WenJian wang jianfang College of Aerospace and Material Engineering National University of Defense Technology Changsha 410073 China

Based on the scanning electron microscope (SEM) observations, it is confirmed that the nacre is composed of aragonite crystals and organic matrix with interlaced arrangement, showing ordered "brick-mortar" structure. The dynamic analysis of preferential orientation of aragonite crystals in the nacre from the abalone (Haliotis diverscolor supertexta) with different shell ages is systematically investigated using X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM). Experiments reveal that, in the nacre from the juvenile mollusk shell, there exist three kinds of orientations of aragonite crystals: (113), (002) and (012). However, along with the growing of the mollusk shell, the intensity of (012) and (113) becomes weak, and the (002) becomes the preferred crystal orientation of aragonite in the nacre from the adult mollusk shell, which means that the c axis of aragonite crystals is perpendicular to the nacreous layers. The results obtained show that the nacre possesses a highly ordered structure at the micrometer/nanometer multiscale levels.

关键词：珠母贝霰石晶体优先定位动态分析软体动物

维普期刊数据库

Achieving robust nitritation in a modified continuous-flow reactor: From micro-granule cultivation to nitrite-oxidizing bacteria elimination

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第2期124卷 117-129页

作者： Wenru Liu Jiajun Song jianfang wang Xiaoming Ji Yaoliang Shen Dianhai Yang National&Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and TechnologySuzhou 215009China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China State Key Laboratory of Pollution Control and Resources Reuse Tongji UniversityShanghai 200092China

In this study,a modified continuous-flow nitrifying reactor was successfully operated for rapid cultivation of micro-granules and achieving robust *** showed that sludge granulation with mean size of ca.100μm was achieved within three weeks by gradually increasing settling velocity-based selection pressure from 0.48 to 0.9 m/*** Nitrospira like nitrite-oxidizing bacteria(NOB)were enriched in the micro-granules with a ratio between ammonia-oxidizing bacteria(AOB)and NOB of 5.7%/6.5% on day 21,fast nitritation was achieved within one-week by gradually increasing of influent ammonium concentration(from 50 to 200 mg/L).Maintaining ammonium in-excess was the key for repressing NOB in the ***,when the influent ammonium concentration switched back to 50 mg/L still with the residual ammonium of 15–25 mg/L,the nitrite accumulation efficiency increased from 90%to 98%.Experimental results suggested that the NOB repression was intensified by both oxygen and nitrite unavailability in the inner layers of ***,continuous operation with ammonium in excess resulted in overproduction of extracellular polysaccharides and overgrowth of some bacteria(e.g.,Nitrosomonas,Arenimonas,and Flavobacterium),which deteriorated the micro-granule stability and drove the micro-granules aggregation into larger ones with irregular ***,efficient nitritation was stably maintained with extremely high ammonium oxidation potential(>50 mg/g VSS/hr)and nearly complete washout of NOB was *** suggested that smooth and spherical granule was not a prerequisite for achieving NOB wash-out and maintaining effective nitritation in the granular ***,the microgranules exhibited a great practical potential for high-rate nitritation.

关键词： Continuous flow Granulation Nitritation Nitrate-oxidizing bacteria repression

维普期刊数据库

Colour routing with single silver nanorods

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2019年第1期8卷 851-861页

作者： Xiaolu Zhuo Hang Kuen Yip Ximin Cui jianfang wang Hai-Qing Lin Department of Physics The Chinese University of Hong KongShatinHong Kong SARChina Beijing Computational Science Research Center Beijing 100193China

Elongated plasmonic nanoparticles have been extensively explored over the past two ***,in comparison with the dipolar plasmon mode that has attracted the most interest,much less attention has been paid to multipolar plasmon modes because they are usually thought to be“dark modes”,which are unable to interact with farfield light ***,we report on an intriguing far-field scattering phenomenon,colour routing,based on longitudinal multipolar plasmon modes supported by high-aspect-ratio single Ag *** advantage of the distinct far-field behaviours of the odd and even multipolar plasmon modes,we demonstrate two types of colour routing,where the incident white light can be scattered into several beams with different colours as well as different propagation *** of the narrow linewidths of the longitudinal multipolar plasmon modes,there is little spectral overlap between the adjacent peaks,giving rise to outstanding colour *** experimental results and theoretical model provide a simple yet effective picture for understanding the far-field behaviour of the longitudinal multipolar plasmon modes and the resultant colour routing ***,the outstanding colour routing capability of the high-aspect-ratio Ag nanorods enables nanoscale optical components with simple geometries for controlling the propagation of light below the diffraction limit of light.

关键词： scattering routing silver

Synthesis of 3D ordered macroporous indium tin oxide using polymer colloidal crystal template

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2006年第5期49卷 537-546页

作者： ZHANG Xue'ao MAN Yahui wang jianfang LIU Changli WU Wenjian College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 China College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 China College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 China College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 China College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 China

Three-dimensional (3D) ordered macroporous indium tin oxide (ITO) is pre- pared using a polymer colloidal crystal template that is formed by self-assembly of the monodisperse poly(methyl methacrylate) (PMMA) microspheres. The morphologies and BET surface area of the macroporous material is examined by scanning electron micro- scope, transmission electron microscopy and N2 adsorption/desorption. Results indicate that the macroporous material has highly ordered arrays of the uniform pores replicated from the PMMA colloidal crystal template when the polymer colloidal crystal template is removed by calcinations at 500℃. The pore diameter (about 450 nm) of macroporous ITO slightly shrank to the PMMA microspheres. The BET surface area and pore volume of the macroporous material are 389 m2·g-1 and 0.36 cm3·g-1, respectively. Moreover, the macroporous ITO, containing 5 mol% Sn and after annealing under vacuum, shows the minimum resistivity of ρ = 8.2×10-3 Ω· cm. The conductive mechanism of macroporous ITO is discussed, and it is believed that the oxygen vacancies are the major factor for excellent electrical properties.

关键词： template synthesis, polymer colloidal crystal, indium tin oxide, three-dimensional order, macroporous material.

维普期刊数据库

(Metal yolk)/(porous ceria shell)nanostructures for high-performance plasmonic photocatalysis under visible light

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第5期13卷 1354-1362页

作者： Nina Jiang Danyang Li Lili Liang Qing Xu Lei Shao Shi-Bin wang Aizheng Chen jianfang wang College of Chemical Engineering Huaqiao UniversityXiamen 361021China Department of Physics The Chinese University of Hong KongShatinHong Kong SARChina Country Fujian Provincial Key Laboratory of Biochemical Technology(Huaqiao University) Xiamen 361021China

We describe a route to the preparation of(metal yolk)/(porous ceria shell)nanostructures through the heterogeneous growth of ceria on porous metal nanoparticles followed by the calcination-induced shrinkage of the *** approach allows for the control of the ceria shell thickness,the metal yolk composition and size,which is difficult to realize through common templating *** yolk/shell nanostructures with monometallic Pt and bimetallic PtAg yolks featuring plasmon-induced broadband light absorption in the visible region are rationally designed and *** superior photocatalytic activities of the obtained nanostructures are demonstrated by the selective oxidation of benzyl alcohol under visible *** excellent activities are ascribed to the synergistic effects of the metal yolk and the ceria shell on the light absorption,electron-hole separation and efficient mass *** synthesis of the(metal yolk)/(porous ceria shell)nanostructures points out a way to the creation of sophisticated heteronanostructures for high-performance photocatalysis.

关键词： yolk-shell nanostructures ceria metal nanoparticles plasmon resonance photocatalysis

Selective deposition of a MOF at the spikes of Au nanostars for SERS detection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第10期17卷 9166-9173页

作者： Yi Liu Ka Kit Chui Xinyue Xia Han Zhang Xiaolu Zhuo jianfang wang School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China Department of Physics The Chinese University of Hong KongShatinHong Kong 999077China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310000China

In the pursuit of advancing molecular sensing through surface-enhanced Raman spectroscopy(SERS),the combination of plasmonic nanoparticles and metal-organic frameworks(MOFs)has emerged as a highly effective approach to enhance the sensitivity and selectivity of SERS ***,most prior investigations have predominantly focused on MOF-coated plasmonic nanoparticles in core@shell or layer-by-layer configurations,leaving a notable knowledge gap in exploring alternative *** we present a facile method to construct a particle-on-mirror architecture by selectively coating a MOF,zeolitic imidazolate framework-8(ZIF-8),onto the tips of Au nanostars and subsequently depositing the resultant nanoparticles onto a Au *** design integrates the electric field enhancement at the sharp tips and nanogaps,along with the molecular enrichment function within the porous MOF immobilized at the tips and nanogaps,leading to a substantial boost in the SERS signal *** a unique SERS platform enables consistent and outstanding SERS performance for analytes of different *** work opens up a promising strategy for constructing multifunctional nanostructures for sensitive SERS detection in real-life scenarios.

关键词： electric field enhancement gold nanostars metal-organic frameworks molecular enrichment plasmon coupling surfaceenhanced Raman spectroscopy(SERS)substrates

Mechanism on minimization of excess sludge in oxic-settling- anaerobic (OSA) process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2008年第1期2卷 36-43页

作者： jianfang wang Qingliang ZHAO Wenbiao JIN Jikan LIN School of Municipal&Environmental Engineering Harbin Institute of TechnologyHarbin 150090China Harbin Institute of Technology Campus of Shenzhen University Town Shenzhen 518055China Bio-treat Technology Limited Dongguan 523581China

The oxic-settling-anaerobic(OSA)process is a promising wastewater treatment technique for efficiently reducing sludge production and improving the stability of process *** this paper,the possible factors of sludge reduction such as sludge decay,uncoupled metabol-ism,and anaerobic oxidation with low sludge production were discussed in the OSA *** has been confirmed that sludge decay is the decisive cause in the OSA process,accounting for 66.7%of sludge production *** decay includes hydrolysis and acidogenesis of dead microorganisms and particle organic carbon adsorbed in sludge floc and endogenous *** batch experi-ments,it has been proven that there is energetic uncoupling in the OSA system since microorganisms were exposed to alternative anaerobic and aerobic *** accounts for about 7.5%of sludge production *** chemical oxygen demand(SCOD)released from the anaerobic sludge tank in the OSA process was used as the substrate for cryptic *** substrate was used for anoxic denitrifying,anaerobic phosphorus release,sulfate reduction,and methane *** anaerobic reactions in the sludge anaerobic tank have lower sludge production than in the aerobic oxidation when equivalent SCOD is consumed,which may lead to approximately 23%of sludge reduction in the OSA *** has been concluded that multiple causes resulted in the minimization of excess sludge in the OSA *** microbial community structure and diversity of sludge samples from the CAS(conventional activated sludge)and OSA systems were investigated by 16 SrDNA PCR-DG-DGGE(poly-merase chain reaction-double gradient-denaturing gradient gel electrophoresis).DGGE profile and cluster analysis showed more abundant species in the OSA system contrasting to microbial communities in the CAS system.

关键词： sludge minimization sludge decay uncoupled metabolism denaturing gradient gel electrophoresis(DGGE) microbial community

Highly efficient electrocatalytic nitrogen fixation enabled by the bridging effect of Ru in plasmonic nanoparticles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 360-370页

作者： Hang Yin Jinwu Hu Caihong Fang Yuyang wang Lixia Ma Nan Zhang Shouren Zhang Ruibin Jiang jianfang wang Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China College of Chemistry and Materials Science The Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Laboratory of Molecular-Based MaterialsCenter for Nano Science and TechnologyKey Laboratory of Electrochemical Clean Energy of Anhui Higher Education InstitutesAnhui Normal UniversityWuhu 241000China Henan Provincial Key Laboratory of Nanocomposites and Applications Institute of Nanostructured Functional MaterialsHuanghe Science and Technology CollegeZhengzhou 450006China Department of Physics The Chinese University of Hong KongHong Kong 999077China

Plasmon-generated hot electrons show great potential for driving chemical *** utilization efficiency of hot electrons is highly dependent on the interaction of the electronic states at the interfaces between plasmonic nanoparticles and other materials/*** interaction can produce new hybridized electron states,which permit direct hot-electron transfer,a more efficient transfer ***,Au usually has very weak interaction with most molecules because of its inertness,which makes direct hot-electron transfer ***,the improvement of the hot-electron transfer efficiency from Au to N_(2)is demonstrated by introducing a Ru bridging *** the N_(2)fixation rate and Faradic efficiency(FE)are enhanced by the excitation of *** enhancement of the N_(2)fixation rate is found to arise from plasmon-generated hot *** calculations show that the strong interaction of the Ru electronic states with the N_(2)molecular orbitals produces new hybridized electronic states,and the Ru d electrons also strongly couple with the Au sp *** a bridging role of Ru makes direct hot-electron transfer from Au to N_(2)possible,improving the FE of nitrogen *** findings demonstrate a new approach to increasing the utilization efficiency of plasmonic hot electrons for chemical reactions and will be helpful to the design of plasmonic catalysts in the future.

关键词： electrocatalytic nitrogen fixation Au/Ru electrocatalysts localized surface plasmon resonance electronic state hybridization hot electron