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Design and synthesis of ZnCo_(2)O_(4)/CdS for substantially improved photocatalytic hydrogen production

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Frontiers of Chemical Science and Engineering 2023年第5期17卷 606-616页

作者： xiaohong li Youji li Xin Guo Zhiliang Jin School of Chemistry and Chemical Engineering North Minzu UniversityYinchuan 750021China College of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China

In this study,the hydrogen evolution performance of CdS nanorods is improved using ZnCo_(2)O_(4).ZnCo_(2)O_(4)nanospheres are synthesized using the hydrothermal and calcination methods,and CdS nanorods are synthesized using the solvothermal *** the perspective of morphology,numerous CdS nanorods are anchored on the ZnCo_(2)O_(4)*** to the experimental results of photocatalytic hydrogen evolution,the final hydrogen evolution capacity of 7417.5μmol·g^(-1)·h^(-1)is slightly more than two times that of the single CdS,which proves the feasibility of our *** various characterization methods,it is proved that the composite sample has suitable optoelectronic *** addition,ZnCo_(2)O_(4)itself exhibits good conductivity and low impedance,which shortens the charge-transfer ***,the introduction of ZnCo_(2)O_(4)expands the adsorption range of light and improves the performance of photocatalytic hydrogen *** design can provide reference for developing high-efficiency photocatalysts.

关键词： ZnCo_(2)O_(4)nanosphere CdS nanorods photocatalytic hydrogen evolution

Effect of neuropeptide Y on white matter demyelination and serum interleukin-4 and gamma-interferon levels in the guinea pig with experimental allergic encephalomyelitis

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Neural Regeneration Research 2008年第5期3卷 554-557页

作者： xiaohong li Ke Yu Zuoxiao li Department of Neurology Affiliated Hospital of Luzhou Medical College Luzhou 646000 Sichuan University China Department of Educational Administration Affiliated Hospital of Luzhou Medical College Luzhou 646000 Sichuan University China

BACKGROUND： Neuropeptide Y （NPY） may influence differentiation of Th cells immunological pathology of experimental allergic encephalomyelitis （EAE） is differentiation of Th cells It is assumed that the related to abnormal OBJECTIVE： To investigate the effect of NPY on white matter demyelination, the serum levels interleukin-4 （IL-4） and gamma-interferon （IFN-γ ）, as well as EAE pathogenesis in an EAE guinea pig model following NPY injection into the lateral cerebral ventricle. DESIGN, TIME AND SETTING： A randomized controlled animal study, which was performed in the Infection Immunity Animal Laboratory, Affiliated Hospital of Luzhou Medical College, China, from October 2005 to April 2006. MATERIALS： Thirty healthy female guinea pigs of 8-12 weeks of age, and 10 healthy female rats of three months of age were used. NPY was provided by Sigma Company, USA. NPY kit was provided by Beijing Huaying Biotechnology Institute, China. METHODS： Thirty guinea pigs were randomly divided into three groups： normal control group, EAE model group, and NPY intervention group （n =10 per group）. Normal control group and EAE model group： Saline （10μ L, once） was injected into the lateral cerebral ventricle. After one week, the same volume of Freund＇s adjuvant complete was either injected subcutaneously into two post-palms or EAE was modeled. NPY intervention group： EAE was modeled after one week and NPY was injected （10 μ L of 6 nmol NPY, once） into the lateral cerebral ventricle. Myelin basic protein （MBP） antigen made from rat spinal cord homogenate and Freund＇s adjuvant complete were injected subcutaneously into both post-palms （0.2 mL per palm） to establish the EAE model. MAIN OUTCOME MEASURES： White matter demyelination of the cerebrum, cerebellum, brain stem, and spinal cord were observed by light microscopy after HE staining. Levels of serum IFN-γ and IL-4 were detected by the double antibody sandwich ABC-EliSA technique. NPY content was detected by radioimmunoassay. RESULTS： Path

关键词： experimental allergic encephalomyelitis neuropeptide Y interleukin-4 gamma-interferon

Runtime reconfiguration of data services for dealing with out-of-range stream fluctuation in cloud-edge environments

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Digital Communications and Networks 2022年第6期8卷 1014-1026页

作者： Shouli Zhang Chen liu xiaohong li Yanbo Han Division of Intelligence and Computing Tianjin UniversityTianjin300072China Beijing Key Laboratory on Integration and Analysis of Large-Scale Stream Data North China University of TechnologyBeijing10009China Cloud Computing Research Center North China University of TechnologyBeijing10009China

The integration of cloud and IoT edge devices is of significance in reducing the latency of IoT stream data processing by moving services closer to the *** this connection,a key issue is to determine when and where services should be *** service deployment strategies used to be static based on the rules defined at the design ***,dynamically changing IoT environments bring about unexpected situations such as out-of-range stream fluctuation,where the static service deployment solutions are not *** this paper,we propose a dynamic service deployment mechanism based on the prediction of upcoming stream *** effectively predict upcoming workloads,we combine the online machine learning methods with an online optimization algorithm for service deployment.A simulation-based evaluation demonstrates that,compared with those state-of-the art approaches,the approach proposed in this paper has a lower latency of stream processing.

关键词： IoT stream processing Edge computing Out-of-Range stream fluctuation Dynamic service deployment

Microstructure and magnetic properties of(SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets fabricated by HPTC with change in heating temperature and composition

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Journal of Rare Earths 2020年第7期38卷 742-748,I0003页

作者： Guangwei Huang li Lou Wenpeng Song Ming li Fuchen Hou xiaohong li State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China College of Materials Science and Engineering Hebei University of EngineeringHandan 056038China

We report the fabrication of bulk anisotropic(SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets using high-pressure thermal compression(HPTC).The correlations among microstructure,magnetic properties,heating temperature and composition of the HPTC nanocomposite magnets were *** HPTC magnet made under variable temperatures(VT),with 19 wt% of FeCo phase,exhibits a maximum energy product of 32 MGOe,which is much higher than that(14 MGOe) for the HPTC magnet made under a constant temperature(CT).When the FeCo content increases to^23 wt%,the HPTC magnet made under VT still remains a high energy product of about 25 *** increasing NdFeB content,the(SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets exhibit an enhanced magnetic anisotropy and *** work is beneficial to fabricating high-performance and low-cost permanent magnets for practical applications.

关键词： Nanocomposite magnets Bulk nanostructures Anisotropy Texture Rare earths

Effects of Temperature and Catalyst to Oil Weight Ratio on the Catalytic Conversion of Heavy Oil to Propylene Using ZSM-5 and USY Catalysts

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Journal of Natural Gas Chemistry 2007年第1期16卷 92-99页

作者： xiaohong li Chunyi li Jianfang Zhang Chaohe Yang Honghong Shan State Key Laboratory of Heavy Oil Processing China University of Petroleum （Huadong） Dongying 257061 Shandong China

It is useful for practical operation to study the rules of production of propylene by the catalytic conversion of heavy oil in FCC （fluid catalytic cracking）. The effects of temperature and C/O ratio （catalyst to oil weight ratio） on the distribution of the product and the yield of propylene were investigated on a micro reactor unit with two model catalysts, namely ZSM-5/Al2O3 and USY/Al2O3, and Fushun vacuum gas oil （VGO） was used as the feedstock. The conversion of heavy oil over ZSM-5 catalyst can be comparable to that of USY catalyst at high temperature and high C/O ratio. The rate of conversion of heavy oil using the ZSM-5 equilibrium catalyst is lower compared with the USY equilibrium catalyst under the general FCC conditions and this can be attributed to the poor steam ability of the ZSM-5 equilibrium catalyst. The difference in pore topologies of USY and ZSM-5 is the reason why the principal products for the above two catalysts is different, namely gasoline and liquid petroleum gas （LPG）, repspectively. So the LPG selectivity, especially the propylene selectivity, may decline if USY is added into the FCC catalyst for maximizing the production of propylene. Increasing the C/O ratio is the most economical method for the increase of LPG yield than the increase of the temperature of the two model catalysts, because the loss of light oil is less in the former case. There is an inverse correlation between HTC （hydrogen transfer coefficient） and the yield of propylene, and restricting the hydrogen transfer reaction is the more important measure in increasing the yield of propylene of the ZSM-5 catalyst. The ethylene yield of ZSM-5/A1203 is higher, but the gaseous side products with low value are not enhanced when ZSM-5 catalyst is used. Moreover, for LPG and the end products, dry gas and coke, their ranges of reaction conditions to which their yields are dependent are different, and that of end products is more severe than that of LPG. So it is clear that maximizin

关键词： fluid catalytic cracking heavy oil propylene temperature catalyst to oil weight ratio ZSM-5 USY

ArgusDroid: detecting Android malware variants by mining permission-API knowledge graph

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Science China(Information Sciences) 2023年第9期66卷 115-133页

作者： Yude BAI Sen CHEN Zhenchang XING xiaohong li College of Intelligence and Computing Tianjin University Research School of Computer Science Australian National University

Malware family variants make minor and relevant changes of behaviors based on the original malware. To analyze and detect family variants, security experts must not only understand malware behaviors but also further observe the correlation between the features of these behaviors. However, the recent data-driven based behavior features are too independent and sometimes too general to obtain a comprehensive profile of the changeable malicious behaviors of family variants derived from the original *** features additionally suffer from limited semantic knowledge which narrows the comprehension of family variants. To this end, in this paper, we propose ArgusDroid that takes advantage of the knowledge graph(KG) to construct a permission-API knowledge graph based on the official Android document. Because each permission or API in the document is described by a specific sentence, we can easily acquire and comprehend the relationship between different features via the hyperlink in sentences or sentence similarity. ArgusDroid also extracts various feature sets from the knowledge graph and validates the detection performance on Android malware family variants based on these features. Extensive experiments by using machine learning and neural network classifiers for variant identification have been carried out. The experimental results demonstrate the effectiveness and usefulness of our obtained feature sets based on ArgusDroid, especially when using the classifiers convolutional neural network(CNN) and multi-layer perception(MLP). Furthermore,when compared to similar feature sets that aim to present relationships across different feature types, such as Axplorer, ArgusDroid generates the feature set which significantly improves malware variant detection by 0.3575 average F1.

关键词： malicious behavior Android document knowledge graph malware family variant machine learning

Effect of SiC whiskers on the oxidation protective properties of SiC coatings for carbon/carbon composites

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Rare Metals 2006年第1期25卷 58-62页

作者： SHI xiaohong li Hejun FU Qiangang li Kezhi ZHANG Xiulian The Key Laboratory of Superhigh Temperature Composites Northwestern Polytechnical University Xi＇an 710072 China

In order to effectively employ the unique high temperature mechanical properties of carbon/carbon composite substrates, SiC coatings reinforced by SiC whiskers were prepared by pack cementation method. The effect of SiC whiskers on the oxidation resistance properties of the single-layer coating and double-layer coating was investigated. SiC whiskers in the single-layer SiC coating have little effect on the anti-oxidation property but obviously improve the thermal shock property. The double-layer coating with inner-layer reinforced coating exhibits more perfect anti-oxidation ability than the double-layer coating with SiC inner-layer coating.

关键词： carbon/carbon composites SiC coating oxidation protection SiC whiskers

Comparative Study of Genetic Structure and Genetic Diversity betweenWild and Cultivated Populations of Taxus cuspidata,Northeast China

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Phyton-International Journal of Experimental Botany 2024年第2期93卷 355-369页

作者： Dandan Wang xiaohong li Yanwen Zhang School of Science Liaodong UniversityDandong118003China

Taxus cuspidata is a rare plant with important medicinal and ornamental *** at the obvious differences between wild and cultivated populations of *** from Northeast China,a total of 61 samples,that is,33 wild yews and 28 cultivated yews were used to analyze the differences and correlations of the kinship,genetic diversity,and genetic structure between them by specific length amplified fragment sequencing(SLAF-seq).Finally,470725 polymorphic SLAF tags and 58622 valid SNP markers were *** analysis showed that 61 samples were classified into 2 clusters:wild populations and cultivated populations,and some wild yews were categorized into the cultivated populations;the genetic diversity analysis showed that the Nei diversity index of wild populations(0.4068)was smaller than that of cultivated populations(0.4414),and the polymorphic information content(PIC)of wild populations(0.2861)was smaller than that of cultivated populations(0.3309).The genetic differentiation analysis showed that the total populations of gene diversity(H_(t))of cultivated and wild populations were respectively 0.8159 and 0.5685,the coefficient of gene differentiation(G_(st))of cultivated and wild populations was respectively 0.3021 and 0.1068,and the gene flow(N_(m))(2.4967)of wild populations was larger than cultivated populations(0.8199).The molecular variance(AMOVA)revealed that inter-population variation accounted for 29.57%of the total genetic variation,while intra-population variation accounted for 70.42% of the total genetic variation(plization of SLAF-seq technolog

关键词： T.cuspidata SLAF-seq SNP wild population cultivated population genetic structure

Visible light responsive N-F-codoped TiO_2 photocatalysts for the degradation of 4-chlorophenol

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Journal of Environmental Sciences 2011年第11期23卷 1919-1924页

作者： xiaohong li Haidong Zhang Xuxu Zheng Zhongyi Yin Le Wei Laboratory of Applied Catalysis Engineering Research Centre for Waste Oil Recovery Technology and EquipmentMinistry of EducationChongqing Technology and Business UniversityChongqing 400067China Environmental and Biological Engineering Institute Chongqing Technology and Business UniversityChongqing 400067China

N-F-codoped TiO2 （NFTO） photocatalysts were synthesized by a simple sol-gel process with tetrabutyl titanate （Ti（OBu）4 ） as the precursor of TiO 2 and ammonium fluoride （NH4 F） as the source of N and *** synthesized photocatalysts were investigated by X- ray diffraction （XRD）,X-ray photoelectron spectroscopy （XPS）,ultraviolet-visible diffuse reflectance spectroscopy （UV-Vis DRS） and photodegradation reaction tests of 4-chlorophenol under visible light irradiation to understand the relationship between the structure of NFTO catalyst and corresponding photocatalytic *** crystal phase and particle size of catalysts were found to be largely affected by the calcination *** addition,N-F-codoping could inhibit phase transition of TiO2 from anatase to *** presence of N and F atoms in the lattice of TiO2 is responsible for the visible light catalytic *** UV-Vis DRS tests,the spectrum of NFTO exhibited red shift compared with Degussa P25 and the band gap was reduced to around 2.92 *** optimal calcination temperature and dopant concentration conditions,the NFTO photocatalyst exhibited the highest activity in the photodegradation reaction tests of 4-chlorophenol under visible light irradiation with a degradation rate of 75.84%.Besides,the 5-recycle test showed that NFTO photocatalyst could be reused and its activity kept stable under visible light irradiation.

关键词： TiO2 N-F-codoping photocatalyst sol-gel process