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Smart object recommendation based on topic learning and joint features in the social internet of things

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Digital Communications and Networks 2023年第1期9卷 22-32页

作者： hongfei zhang Li Zhu Tao Dai Liwen zhang Xi Feng Li zhang Kaiqi zhang School of Software Engineering Xi'an Jiaotong UniversityXi'anShaanxi710049China College of Future Transportation Chang’An UniversityXi'anShaanxi710054China Peng Cheng Laboratory Shenzhen518055China Shaanxi Federation of Trade Unions China Xi'an Physical Education University Xi'anShaanxi710068China School of Economics and Management Chang’An UniversityXi'anShaanxi710054China

With the extensive integration of the Internet,social networks and the internet of things,the social internet of things has increasingly become a significant research *** the social internet of things application scenario,one of the greatest challenges is how to accurately recommend or match smart objects for users with massive *** a variety of recommendation algorithms have been employed in this field,they ignore the massive text resources in the social internet of things,which can effectively improve the effect of *** this paper,a smart object recommendation approach named object recommendation based on topic learning and joint features is *** proposed approach extracts and calculates topics and service relevant features of texts related to smart objects and introduces the“thing-thing”relationship information in the internet of things to improve the effect of *** show that the proposed approach enables higher accuracy compared to the existing recommendation methods.

关键词： Social internet of things Smart object recommendation Topics Features Thing-thing relationship

A rapid protein sample preparation method based on organic-aqueous microwave irradiation technique

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Science China Chemistry 2015年第3期58卷 526-531页

作者： Shuaibin Wu hongfei zhang Kaiguang Yang Junfeng Ma Zhen Liang Lihua zhang Yukui zhang Key Laboratory of Separation Sciences for Analytical Chemistry National Chromatographic R&A CenterDalian Institute of Chemical Physics Chinese Academy of Sciences China National Tobacco Quality Supervision and Test Center College of Chemistry and Chemical Engineering Hubei Normal University Department of Biological Chemistry the Johns Hopkins University School of Medicine

Fast and efficient sample preparation methods are a prerequisite for protein identification in bottom-up proteomics. Here, an innovative microwave irradiation sample preparation method was developed based on an optimized organic-aqueous solvent system for protein identification. Specifically, protein solutions containing high-concentration acetonitrile were subjected to 5 min microwave irradiation. After cooling down, trypsin was added and the digestion was performed with 30 s microwave irradiation, and the resulting peptides were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF MS). A shortened processing time of only 5.5 min is needed with this method(more than 12 h is necessary in the traditional overnight protein sample preparation). Moreover, due to the absence of urea and other chaotropic reagents, the digests can be readily identified by MALDI-TOF MS. When an assessment of this method was performed by digesting a model protein BSA, 69% ± 3% sequence coverage corresponding to 47 ± 3 peptides was obtained, which shows better protein identification than that from the standard overnight protein sample preparation method(51% ± 2% sequence coverage and 23 ± 1 peptides). Another model protein α-casein was used for the analysis of protein phosphorylation with the newly developed method that yielded 4 phosphopeptides with 8 phosphorylation sites, whereas 3 phosphopeptides with 2 phosphorylation sites were obtained from the traditional overnight approach. Moreover, the organic-aqueous microwave irradiation method provides effective digestion for proteins down to fmol.

关键词： MALDI-TOF MS microwave organic-aqueous solvent protein identification digestion

Magma Generation of Magnetite-Rich Intermediate-Mafic Rocks and Its Mantle Processes in the Southwestern Alxa Block,NW China

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Journal of Earth Science 2022年第1期33卷 161-176页

作者： Lu Tao hongfei zhang Jing Wu Xiaochun Zhou Liqi zhang State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China School of Earth Sciences China University of GeosciencesWuhan 430074China Gemmological Institute China University of GeosciencesWuhan 430074China Faculty of Earth Resources China University of GeosciencesWuhan 430074China

Many studies focus on mineralization of huge magnetite ore deposits and petrogenesis of their large-volume host ***,magma generation of those small-scale intrusions with enrichment of magnetite is poorly reported and paid attention *** here carry out an integrated study of magnetite chemistry,U-Pb zircon dating,geochemistry,and Sr-Nd-Hf isotopes for the magnetite-rich intermediate-mafic rocks from the Helishan pluton in the southwestern Alxa Block,Northwest ***,together with several previously reported magnetite/iron-rich intrusions nearby,is capable of providing some constraints on magma generation of magnetite/iron-rich intrusive *** Helishan pluton,dated at ca.290 Ma,consists of hornblende gabbro,diorite,and quartz monzodiorite with~3%-5%magnetite in all the *** on magnetite chemistry manifests a magmatic origin for *** the lithologies display high TFeO/MgO ratio (1.71-1.89),weakly fractionated REE patterns((La/Yb)_(N)=1.82-10.17),enrichment of Rb,Sr,and Pb,and depletion of high field strength *** have (^(87)Sr/^(86)Sr)_(i) values of 0.705 2 to 0.705 8,ε_(Nd)(t) values of+0.03 to+0.64,and zircon ε_(Hf)(t) values of +6.5 to+*** propose that they were derived from partial melting of iron-rich metasomatized lithospheric *** systematic variations of Sr/Y ratios and Nd-Hf isotopic compositions with time for the Paleozoic igneous rocks at the southwestern Alxa Block indicate ever existence of thinning and rebirth of lithospheric *** geodynamic process could be the potential mechanism to give rise to the iron-rich signature of the reborn mantle sources of the Helishan *** intermediatemafic intrusions at subduction zones,they are unlikely to form considerable magnetite ore deposits since their modest magmatic flux and early fractional crystallization of magnetite at a high oxygen fugacity and H_(2)O condition.

关键词： geochemishtry magnetite-rich intrusion mantle source petrogenesis lithospheric process Alxa Block Northwest China

The effect of symmetry potential on the balance energy of light particles emitted from mass symmetric heavy-ion collisions with isotopes,isobars and isotones

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Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2407-2413页

作者： WANG YongJia GUO ChenChen LI QingFeng zhang hongfei School of Science Huzhou Teachers CollegeHuzhou 513000China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

Using the Ultrarelativistic Quantum Molecular Dynamics(UrQMD) model,the balance energies of free neutrons,free protons and Z=1 particles(including free protons,deuterons and tritons) from mass symmetric heavy-ion collisions with isotopes,isobars and isotones are *** influence of nuclear symmetry potential energy on the balance energy is *** is found that the balance energy of free neutrons is sensitive to the nuclear symmetry energy,while that of free protons is ***,the initial neutron/proton ratio dependence of the balance energy of free neutrons from Sn isotopes can be taken as a useful probe to constrain the stiffness of the nuclear symmetry energy.

关键词： symmetry energy directed flow balance energy

Theoretical study on spherical proton emission

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Science China(Physics,Mechanics & Astronomy) 2009年第10期52卷 1536-1541页

作者： zhang hongfei WANG YongJia DONG JianMin LI JunQing School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Kavli institute for Theoretical Physics China Chinese Academy of SciencesBeijing 100190China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The proton radioactivity half-lives of spherical proton emitters are investigated within a generalized liquid drop model(GLDM),including the proximity effects between nuclei in a neck and the mass and charge *** penetrability is calculated in the WKB approximation and the assault frequency is estimated by the quantum mechanism method considering the structure of the parent *** spectroscopic factor is taken into account in half-life calculation,which is obtained by employing the relativistic mean field(RMF) *** half-lives within the GLDM are compared with the experimental data and other theoretical *** results show that the GLDM works quite well for spherical proton emitters when the assault frequency is estimated by the quantum mechanical method and the spectroscopic factor is considered.

关键词： proton emission half-lives spectroscopic factors generalize liquid drop model

U-Pb zircon age of the foliated garnet-bearing granites in western Dabie Mountains,Central China

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Chinese Science Bulletin 2001年第19期46卷 1657-1660页

作者： zhang hongfei ZHONG Zengqiu GAO Shan zhang Benren LI Huiming Faculty of Earth Sciences China University of GeosciencesWuhan 430074China Department of Geology Northwest UniversityXi’an 710069China Tianjin Institute of Geology and Mineral Resource Tianjin 300170China

U-Pb zircon dating on two foliated garnet-bearing granite samples in the western Dabie ultra-high-pressure (UHP) metamorphic unit yields concordant ages of (234±4) Ma and (227±5) Ma, respectively. These ages, following the UHP peak metamorphism, represent the magma emplacement ages for the foliated garnet-bearing granites. This, for the first time, shows that there are the Triassic granites in the Dabie Mountains. The foliated garnet-bearing granites resemble A-type granite in geochemical characteristics, indicating that they were formed in exten-sional geodynamic setting. The magma formation reflects a reheating event in the Dabie orogenic belt and it enhances the transfer of tectonic regime from collision into extension and promotes the rapid exhumation into lower crust for the UHP metamorphic rocks.

关键词： Dabie orogenic belt foliated garnet-bearing granite U-Pb zircon age post-collisional granite.

Analysis,Prediction and Process Optimization Concerning Ammonium Chloride Corrosion in Ebullated-Bed Hydrogenation Unit for Treating Residual Oil

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China Petroleum Processing & Petrochemical Technology 2020年第4期22卷 108-116页

作者： Bao Zhenyu Wang Ning zhang hongfei Duan Yongfeng Yu Fengchang R&D Center of Luoyang Technology SINOPEC Engineering(Group)Co.LTD.Luoyang 471003

Ammonium chloride corrosion in the reactor effluent system remains to be a barrier for the safe operation of the ebullated-bed hydrogenation unit as impurity content is higher compared with that of the ordinary hydrogenation *** this research,a Sinopec envisaged case study was conducted on feed oil containing 2.92μg/g of Cl and 0.38%of N,because the impurity content of feed oil was representative in residue *** deposition patterns in heat exchangers were investigated by changing process variables,and then water wash strategy was optimized in view of the relative humidity to obtain a minimum water flowrate,and finally the process optimization suggestions concerning the operation of heat exchangers were *** show that with the measured content of nitrogen and chlorine in the feed,the NH4Cl deposition temperature of hot high-pressure vapor and hot low-pressure vapor was 223.4℃ and 173.7℃,respectively,and the minimum water wash flowrate for heat exchangers of hot high-pressure vapor with mixed hydrogen and hot low-pressure vapor with cold low-pressure oil was 38.0 t/h and 5.4 t/h,*** wash should be carried out intermittently upstream of the heat exchanger tube *** consideration of energy consumption,it is recommended to reduce the tube pass outlet temperature of the above heat exchangers to 240℃ and 190℃,respectively.

关键词： ebullated-bed hydrogenation corrosion ammonium salt water wash deposition temperature

Effect of Ta on the microstructure of high performance Ni-based powder metallurgy superalloys

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Science China(Technological Sciences) 2019年第11期62卷 1961-1967页

作者： WANG ZhiCheng WANG Hao LIU GuoQuan HUANG HaiLiang zhang hongfei SHAO YinLong HU BenFu School of Materials Science and Engineering University of Science and Technology Beijing

The effect of Ta on the microstructures of nickel-based powder metallurgy superalloys with different Ta contents was investigated in experiments and thermodynamic calculations. The Ta element predominantly occupied the γ′ phase of the superalloys, with some incursion into the γ phase, and minimal presence in the MC carbide. By substituting part of the Ti-Nb alloy,the Ta element transforms(Ti-Nb)C into(Ti-Ta-Nb)C. The MC carbides and small amounts of M23C6 carbides were observed on the ribbon-like grain boundaries. The Ta addition little affected the primary γ′ phase, but greatly influenced the secondary γ′phase. Ta promoted the splitting of the secondary γ′ phase, converting it to a more stable state. Increasing the Ta content increased the lattice constants of γ′ and γ and altered the degree of misfit between γ′ and γ, indicating a morphology change. The Ta content also influenced the formation of the tertiary γ′ phase.

关键词： superalloy powder metallurgy microstructure carbides γ'

Antidiabetic effect of an engineered bacterium Lactobacillus plantarum-pMG36e-GLP-1 in monkey model

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Synthetic and Systems Biotechnology 2021年第4期6卷 272-282页

作者： Jie Luo hongfei zhang Jiachen Lu ChaoLin Ma Tingtao Chen School of Public Health and Key Laboratory of Preventive Medicine Nanchang UniversityNanchang330031China Institute of Life Sciences Nanchang UniversityNanchang330031China School of Queen Mary Nanchang UniversityNanchang330031China National Engineering Research Center for Bioengineering Drugs and the Technologies Institute of Translational MedicineThe First Affiliated HospitalNanchang University1299 Xuefu RoadHonggu DistrictNanchang330031PR China

Glucagon-like peptide-1(GLP-1)reduces postprandial hyperglycaemia,but its short half-life inhibits clinical *** aim of the current study was to evaluate the treatment efforts of an engineered strain,Lactobacillus plantarum-pMG36e-GLP-1(***-pMG36e-GLP-1),that continuously expresses GLP-1 in spontaneous type 2 diabetes mellitus(T2DM)*** 7 weeks of oral supplementation with ***-pMG36e-GLP-1,the fasting blood glucose(FPG)of monkeys was significantly(p<0.05)reduced to a normal level and only a small amount of weight was *** results of metagenomic sequencing showed that ***-pMG36e-GLP-1 caused a substantial(p<0.05)reduction in the intestinal pathogen Prevotella and marked enhancement of butyrate-producing Alistipes *** to the functional analysis using Kyoto Encyclopaedia of Genes and Genomes(KEGG)pathways,19 metabolism-related pathways were significantly enriched in T2DM monkeys after treatment with ***-MS faecal metabolomics analysis found 41 significant differential metabolites(11 higher and 30 lower)in monkeys after treatment pathways linked to the metabolism of cofactors and vitamins were the most *** present study suggests that ***-pMG36e-GLP-1 had an impact on the gut microbial composition and faecal metabolomic profile in spontaneous T2DM monkeys and may be a novel candidate for diabetes treatment.

关键词： L.plantarum-pMG36e-GLP-1 T2DM Gut microbiome Faecal metabolomics