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Comparison of masking agents for antimony speciation analysis using hydride generation atomic fluorescence spectrometry

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Frontiers of Environmental Science & Engineering 2015年第6期9卷 970-978页

作者： Jianhong XI Mengchang HE Kunpeng WANG guizhi ZHANG School of Chemistry and Environmental Engineering Shanxi Datong University Datong 037009 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

A sensitive atomic spectrometric method for the redox speciation analysis of Sb in water is described. The proposed method is based on the selective generation of stibine from Sb（III） in a continuous flow system using non-dispersive atomic fluorescence spectrometry for detection. The effects of the HCI concentration on the fluorescence intensities of Sb（III） and Sb（V） were investigated. The results indicated that atomic fluorescence emission due to Sb（V） can constructively interfere with the determination of Sb（III）. For the determination of Sb（III）, four compounds were tested as masking agents to inhibit the generation of stibine from Sb（V）. The effects of the concentrations of the masking agents and of HC1 on the fluorescence signals from Sb（III） and Sb（V） were studied. The results indicated that citric acid and NaF can successfully suppress hydride generation from Sb（V）. To evaluate the developed methodology and the influence of the matrix, the recovery of Sb（III） from natural water that was spiked with different Sb（III） and Sb（V） concentrations was tested.

关键词： Sb(III) Sb(V) determination maskingagents hydride generation (HG-AFS)

The Intersection Problem for Kite-GDDs of Type 2u

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Journal of Mathematical Research with Applications 2021年第6期41卷 551-564页

作者： Yonghong AN guizhi ZHANG College of Continuing Education Hulunbuir University Division of Science and Technology Hulunbuir University

The intersection problem for kite-GDDs is the determination of all pairs（T, s） such that there exists a pair of kite-GDDs（X, H, B） and（X, H, B） of the same type T satisfying|B∩ B| = s. In this paper the intersection problem for a pair of kite-GDDs of type 2is investigated. Let ■;I（u） = {0, 1,..., b-2, b}, where b= u（u-1）/2 is the number of blocks of a kite-GDD of type 2. We show that for any positive integer u ≥ 4, J（u） = I（u） and J（3） = {0, 3}.

关键词： kite-GDD group divisible design intersection number

托法替布治疗原发性皮肤淀粉样变一例并文献复习

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中国麻风皮肤病杂志 2025年第1期41卷 51-54页

作者：袁瑞清周桂芝刘红山东第一医科大学附属皮肤病医院山东济南250022 山东省皮肤病性病防治研究所山东济南250022

原发性皮肤淀粉样变是一种慢性瘙痒性疾病,目前缺乏标准的治疗方案,传统疗法如抗组胺药、沙利度胺和局部糖皮质激素等疗效欠佳。有研究认为纠正瘙痒-搔抓-瘙痒的恶性循环是治疗原发性皮肤淀粉样变的关键,托法替布是一种口服泛JAK抑制剂... 详细信息

原发性皮肤淀粉样变是一种慢性瘙痒性疾病,目前缺乏标准的治疗方案,传统疗法如抗组胺药、沙利度胺和局部糖皮质激素等疗效欠佳。有研究认为纠正瘙痒-搔抓-瘙痒的恶性循环是治疗原发性皮肤淀粉样变的关键,托法替布是一种口服泛JAK抑制剂,可显著降低特应性皮炎小鼠模型的抓挠行为和IL-4和IL-31的表达,本文报道一例托法替布治疗原发性皮肤淀粉样变并复习相关文献。

关键词：托法替布原发性皮肤淀粉样变 JAK抑制剂

Optimization of enrichment and pretreatment of low-activity radium isotopes in the open ocean

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Acta Oceanologica Sinica 2023年第8期42卷 171-177页

作者： Guiyuan Dai guizhi Wang Qing Li Weizhen Jiang Fei Zhang State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies Xiamen UniversityXiamen 361102China College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China

In the open ocean,radium isotopes are useful tracers of residence time and water-mass ***,limited by the measurement resolution of commonly used gamma counters,the low activity of radium in the open ocean makes it necessary to enrich radium from large volumes of seawater and pretreat radium-enriched carriers prior to *** commonly applied method of radium enrichment and pretreatment,however,has limitations of uneven coating of MnO_(2)on cartridges,relatively expensive cartridges,time-consuming issues during cartridge-ashing,ash loss during transfer,and changes of gamma counters efficiency caused by different ash *** address these issues,in this study we optimized the enrichment and pretreatment of low-activity radium prior to ***,we replaced commonly used acrylic cartridges with cheaper polypropylene cartridges,which took 6 h to be ashed,42 h shorter than for acrylic ***,MnO_(2)-coated cartridges were prepared with a circulating hot acidic KMnO_(4)solution to ensure homogeneous *** radium extraction efficiency of this MnO_(2)-coated cartridge was 20%-61%higher than that prepared by directly immersing cartridges in the *** radium delayed coincidence counter efficiency for MnO_(2)-coated cartridge was stable with a moisture content of ***,after ashing cartridges,instead of directly transferring the ash to a measurement vial,a mixture of hydroxylamine hydrochloride and hydrochloric acid was used to completely leach the ash for long-lived radium,followed by coprecipitation by BaSO_(4),to avoid potential loss of ash during transfer and variations in measurement geometry due to different ash *** the recovery of long-lived radium pretreatment was 94%-102%,which improved by 11%compared with the common *** addition,the radium extraction efficiency of the MnO_(2)-coated cartridge varied from 3%to 4%within the in situ pump working flow rate of 4-7 L/min,which fell within the

关键词： radium isotopes MnO_(2)-coated cartridge enrichment of Ra pretreatment of MnO_(2)-coated cartridges RaDeCC efficiency extraction efficiency

Image recoloring using geodesic distance based color harmonization

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Computational Visual Media 2015年第2期1卷 143-155页

作者： Xujie Li Hanli Zhao guizhi Nie Hui Huang Intelligent Information Systems Institute Wenzhou University

In this paper, we present a computationally simple yet effective image recoloring method based on color harmonization. Our method permits the user to obtain recolored results interactively by rotating a harmonious template after completing color harmonization. Two main improvements are made in this paper. Firstly, we give a new strategy for finding the most harmonious scheme, in terms of finding the template which best matches the hue distribution of the input image. Secondly, in order to achieve spatially coherent harmonization, geodesic distances are used to move hues lying outside the harmonious sectors to inside them. Experiments show that our approach can produce higher-quality visually pleasing recolored images than existing methods. Moreover, our method is simple and easy to implement, and has good runtime performance.

关键词： image editing color harmonization geodesic distance

Joint UAV 3D deployment and sensor power allocation for energy-efficient and secure data collection

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High Technology Letters 2023年第3期29卷 223-230页

作者：王东 LI guizhi SUN Xiaojing WANG Changqing Army Academy of Artillery and Air Defense Hefei 230031P.R.China

Unmanned aerial vehicles(UAVs) are advantageous for data collection in wireless sensor networks(WSNs) due to its low cost of use,flexible deployment,controllable mobility,etc. However,how to cope with the inherent issues of energy limitation and data security in the WSNs is challenging in such an application paradigm. To this end,based on the framework of physical layer security,an optimization problem for maximizing secrecy energy efficiency(EE) of data collection is formulated,which focuses on optimizing the UAV’s positions and the sensors’ transmit power. To overcome the difficulties in solving the optimization problem,the methods of fractional programming and successive convex approximation are then adopted to gradually transform the original problem into a series of tractable subproblems which are solved in an iterative manner. As shown in simulation results,by the joint designs in the spatial domain of UAV and the power domain of sensors,the proposed algorithm achieves a significant improvement of secrecy EE and rate.

关键词： physical layer security energy efficiency(EE) power allocation unmanned aerial vehicle(UAV) data collection wireless sensor network(WSN)

Modification of compact TiO_(2) layer by TiCl_(4)-TiCl_(3) mixture treatment and construction of high-efficiency carbon-based CsPbI_(2)Br perovskite solar cells

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Journal of Energy Chemistry 2021年第12期30卷 442-451,I0010页

作者： Wenran Wang Yu Lina guizhi Zhang Cuiting Kang Zhenxiao Pan Xinhua Zhong Huashang Rao Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou 510642GuangdongChina Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642GuangdongChina

In the construction of high performance planar perovskite solar cells(PSCs),the modification of compact TiO_(2) layer and engineering of perovskite/TiO_(2) interfaces are essential for efficient electron transfer and retarded charge recombination *** this work,a facile and effective strategy is developed to modify the surface of compact TiO_(2) layer by TiCl_(4)-TiCl_(3) mixture *** with conventional sole TiCl_(4),the TiCl_(4)-TiCl_(3) treatment takes the advantage of accelerated and controlled hydrolysis of TiCl_(3),therefore TiO_(2) with dominating anatase phase and moderate roughness is obtained to facilitate the growth of CsPbI_(2) Br perovskite layer with high ***,the oxidation-driven hydrolysis of TiCl_(3) component results in surface Cl doping that facilitates interfacial electron transfer with retarded recombination *** average power conversion efficiency(PCE) of carbon-based CsPbI_(2) Br planar PSCs based on TiCl_(4)-TiCl_(3) treatment increases to 14.18% from the intial 13.04% based on conventional sole TiCl_(4) *** champion PSC exhibits a PCE of 14.46%(V_(oc)=1.28 V,J_(sc)=14.21 mA/cm^(2),and FF=0.794),which is one of the highest PCEs for carbon-based CsPbI_(2) Br PSCs.

关键词： Perovskite solar cells CsPbI_(2)Br TiO_(2) TiCl_(3) Photovoltaic

Ionizable polymeric nanocarriers for the codelivery of bi-adjuvant and neoantigens in combination tumor immunotherapy

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Bioactive Materials 2023年第8期26卷 169-180页

作者： Ting Su Xiang Liu Shuibin Lin Furong Cheng guizhi Zhu Center for Translational Medicine Precision Medicine InstituteThe First Affiliated HospitalSun Yat-sen UniversityGuangzhou510080China Department of Pharmaceutics and Center for Pharmaceutical Engineering and Sciences Institute for Structural Biology and Drug DiscoverySchool of PharmacyThe Developmental Therapeutics ProgramMassey Cancer CenterVirginia Commonwealth UniversityRichmondVA23298USA

Ionizable lipid nanocarriers have made historical contribution to COVID-19 mRNA ***,we report ionizable polymeric nanoparticles that co-deliver bi-adjuvant and neoantigen peptides for cancer immunotherapy in combination with immune checkpoint blockade(ICB).Current cancer ICB benefits only a small subset of patients,largely due to a lack of pre-existing target cells and checkpoint targets for ICB,tumor antigenic heterogeneity,and tumor *** vaccines hold the potential to enhance ICB therapeutic efficacy by expanding antitumor cell repertoires,upregulating immune checkpoint levels and hence sensitizing ICB,and reducing tumor *** defined peptide vaccines are attractive,but their current therapeutic efficacy has been limited due to 1)poor vaccine delivery to immunomodulatory lymph nodes(LNs)and antigen(Ag)-presenting cells(APCs),2)poor immunostimulant adjuvant efficacy with restricted target cell subsets in humans,3)limited adjuvant/Ag codelivery to enhance Ag immunogenicity,and 4)limited ability to overcome tumor antigenic ***,we developed nanovaccines(NVs)using pH-responsive polymeric micellular nanoparticles(NPs)for the codelivery of bi-adjuvant[Toll-like receptor(TLR)7/8 agonist R848 and TLR9 agonist CpG]and peptide neoantigens(neoAgs)to draining LNs for efficient Ag presentation in a broad range of APC *** NVs potentiated the immunogenicity of peptide Ags and elicits robust antitumor T cell responses with memory,and remodeled the tumor immune milium with reduced tumor *** a result,NVs significantly enhanced ICB therapeutic efficacy for murine colorectal tumors and orthotopic glioblastoma multiforme(GBM).These results suggest marked potential of bi-adjuvant/neoAg-codelivering NVs for combination cancer immunotherapy.

关键词： Polymeric nanoparticles Combination adjuvants Cancer neoantigen Nanovaccine codelivery Cancer immunotherapy

The Novel Spectrum Allocation Algorithm in Cognitive Radio System

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China Communications 2017年第3期14卷 108-117页

作者： Xiangqian Che Yupeng Xie Ye Tian Qijing Zhang guizhi Sun School of Computer and Information Engineering & School of Electronics and Information Engineering Heilongjiang University of Science and Technology School of Electronics and Information Engineering Harbin Institute of Technology

In order to reduce the disturbance on an authorizing user and lower the competition between cognitive users, assure the normal communication of a cognitive radio system, reliability theory is applied to describe if a channel can be used by a cognitive user or not and the probability that the channel is continually used for a period. Three aspects including space, time domain and frequency domain are united for the research on the distribution of frequency spectrum. The simulation result shows that, in the space domain, time domain, frequency domain algorithm, the transmitted data volume and the total throughput of the system are superior to those in greedy algorithm and time domain—frequency domain algorithm, the novel algorithm is helpful to reduce the disturbance caused by a cognitive user to an authorizing user and lower the competition between cognitive users, this simulation result shows that the proposed algorithm is effective.

关键词： reliability theory spectrum allocation cognitive radio normal communication