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浅谈广告行业税收征管现状与对策

天津经济 2011年第5期 56-59页

作者：吕大钟臧静冯晓娟天津市和平区地方税务局天津市和平区地方税务局税管科天津市和平区地方税务局办公室

文章对天津市和平区广告行业经营模式、税收监控、涉及税种和税收征管中存在的问题进行了深入的调查分析,并提出了加强广告业税收征管的建议。

关键词：广告营业税征管现状对策

Progress in clinical trials of stem cell therapy for cerebral palsy

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Neural Regeneration Research 2021年第7期16卷 1377-1382页

作者： zhong-Yue lv Ying Li Jing Liu Stem Cell Clinical Research Center National Joint Engineering LaboratoryRegenerative Medicine CenterThe First Affiliated Hospital of Dalian Medical UniversityDalianLiaoning ProvinceChina dalian Innovation Institute of Stem Cell and Precision Medicine DalianLiaoning ProvinceChina

Cerebral palsy is the most common disease in children associated with lifelong disability in many *** research has demonstrated that traditional physiotherapy and rehabilitation therapies cannot alone cure cerebral *** cell transplantation is an emerging therapy that has been applied in clinical trials for a variety of neurological diseases because of the regenerative and unlimited proliferative capacity of stem *** this review, we summarize the design schemes and results of these clinical *** findings reveal great differences in population characteristics, stem cell types and doses, administration methods, and evaluation methods among the included clinical ***, we also assess the safety and efficacy of these clinical *** anticipate that our findings will advance the rational development of clinical trials of stem cell therapy for cerebral palsy and contribute to the clinical application of stem cells.

关键词： adverse events brain cell transplantation central nervous system cerebral palsy clinical trials plasticity regeneration stem cell

Morphology and magnetic properties of α-Fe_2O_3 particles prepared by octadecylamine-assisted hydrothermal method

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Particuology 2012年第4期10卷 456-461页

作者： zhong Liu Baoliang lv Dong Wu Yuhan Sun State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Low Carbon Conversion Center Shanghai Advanced Research InstituteChinese Academy of SdencesShanghai 201203China Graduate University of the Chinese Academy of:Sciences Beijing 100049China

α-Fe2O3 particles with various morphologies, including micro-doublesphere, tetrakaidecahedron and nanoparticles-aggregated micro-ellipsoid, were successfully synthesized via an octadecylamine-assisted hydrothermal method. The products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and high-resolution transmission electron microscopy （HRTEM）. The results indicate that the presence of octadecylamine played a crucial role in morphology evolution by selective crystal adsorption. The protonated octadecylamine increased the pH value that accelerated nucleation, and the long alkyl groups of octadecylamine acted as an adsorption inhibitor to retard the growth of nanoparticles. The as-prepared α-Fe2O3 particles exhibited higher remanent magnetization and coercivity than other α-Fe2O3 particles of similar size. These properties should be attributed to the superstructure and the shape anisotropy of the synthesized particles.

关键词： Octadecylaminec α-Fe2O3MorphologiesMagnetic property

Upper Minus Total Domination Number of Regular Graphs

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Acta Mathematicae Applicatae Sinica 2017年第1期33卷 69-74页

作者： Zhen-lin LI Xin-zhong lv Department of Mathematics Zhejiang Normal University Jinhua 321004 China

Let Гt-（G） be upper minus total domination number of G. In this paper, We establish an upper bound of the upper minus total domination number of a regular graph G and characterize the extremal graphs attaining the ... 详细信息

关键词： upper minus total domination regular graph

Recent Advances in High‑Efficiency Electrocatalytic Water Splitting Systems

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Electrochemical Energy Reviews 2023年第1期6卷 1-38页

作者： Xian‑Wei lv Wen‑Wen Tian zhong‑Yong Yuan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) School of Materials Science and EngineeringNankai UniversityTianjin 300350China

Electrocatalytic water splitting driven by renewable energy input to produce clean hydrogen(H_(2))has been widely considered a prospective approach for a future hydrogen-based ***,the development of industrial alkaline water electrolyzers is hindered due to their unfavorable thermodynamics with high overpotential for delivering the whole process,caused by sluggish kinetics involving four-electron *** exploration of water electrolysis with low energy consumption and high efficiency is urgently required to meet the ever-growing energy storage and portfolio *** review emphasizes the strategies proposed thus far to pursue high-efficiency water electrolysis systems,including from the aspects of electro-catalysts(from monofunctional to bifunctional),electrode engineering(from powdery to self-supported),energy sources(from nonrenewable to renewable),electrolytes(from pure to hybrid),and cell configurations(from integrated to decoupled).Critical appraisals of the pivotal electrochemistry are highlighted to address the challenges in elevating the overall efficiency of water ***,valuable insights for the future development directions and bottlenecks of advanced,sustainable,and high-efficiency water splitting systems are outlined.

关键词： Electrocatalytic water splitting Hydrogen-based society Electrode engineering Cell configurations Challenges and perspectives

Time-dependent Wave Packet Quantum Scattering Study of Reaction S（3p）＋H2→HS＋H on a New ab initio Potential Energy Surface 3A’

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Chinese Journal of Chemical Physics 2012年第3期25卷 291-296,373页

作者： Shuang-jiang lv Pei-yu Zhang Guo-zhong He State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics ChineseAcademy of Sciences Dalian 115023 China

A new potential energy surface is presented for the triplet state 3At of the chemical reaction S（3P）＋H2 from a set of accurate ab initio data. The single point energies are computed using highly correlated complete active space self-consistent-field and multi-reference configuration interaction wave functions with a basis set of aug-cc-pV5Z. We have fitted the full set of energy values using many-body expansion method with an Aguado-Paniagua function. Based on the new potential energy surface, we carry out the time-dependent wave packet scattering calculations over the collision energy range of 0.8-2.2 eV. Both the centrifugalsudden approximation and Coriolis Coupling cross sections are obtained. In addition, the total reaction probabilities are calculated for the reactant H2 initially in the vibrational states v=0-3 （j=0）. It is found that initial vibrational excitation enhances the title reaction.

关键词： Potential energy surface Quantum-scattering Time-dependent wave packet

Synthesis of vanadium powder by magnesiothermic reduction of V_(2)O_(3)in a reactive molten salt

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Journal of Iron and Steel Research International 2023年第4期30卷 650-659页

作者： da-peng zhong Gui-shang Pei Jia-long Kang Jun-yi Xiang Cheng Pan Wu-an Gu Xue-wei lv Lan-jie Li Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China Pangang Group Research Institute Co. Ltd.Panzhihua 617000SichuanChina College of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina The State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China Chengde Iron and Steel Group Co. Ltd.HBIS Group Co.Ltd.Chengde 067102HebeiChina

As an important strategic metal,vanadium is generally used to prepare special steels,titanium alloys,and hydrogen storage materials.A new method of producing vanadium(metal)powder from V_(2)O_(3)using block Mg is presented *** an auxiliary molten salt,V_(2)O_(3)was successfully transformed into V by Mg *** by-product,MgO,was transformed into MgCl_(2)by adding ZrCl_(4),which prevented the generation of MgV_(2)O_(4)and allowed the reaction to proceed *** rod-like alloy phases,Zr_(0.03)V_(1.97),which formed in the presence of excess Mg,may hinder the diffusion of oxygen from the *** recovery rate of vanadium after separation and purification was approximately 45%–50%,where the main loss occurred during ball *** the optimal conditions(Mg content of 48.3%,reduction time of 1.5 h,and temperature of 850℃),the purity of vanadium exceeded 99 wt.%,and the O content decreased to 0.34 wt.%.

关键词： Deoxidation Vanadium powder Magnesiothermic reduction Molten salt

Levels,distributions,and sources of legacy and novel per-and perfluoroalkyl substances(PFAS)in the topsoil of Tianjin,China

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Journal of Environmental Sciences 2022年第2期34卷 71-81页

作者： Donghui Ma Huifang zhong Jitao lv Yawei Wang Guibin Jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China

Soil is a major sink for per-and perfluoroalkyl substances(PFAS),wherein PFAS may be transferred through the food chain to predators at upper trophic levels,which poses a threat to human ***,the concentrations and distributions of legacy and novel PFAS in topsoil samples from different functional areas in Tianjin were comprehensively *** PFAS congeners were identified,with concentrations ranging from 0.21 ng/g to 5.35 ng/g,with a mean concentration of 1.25 ng/*** main PFAS in the topsoil was perfluorooctanoic acid(PFOA).6:2 chlorinated polyfluorinated ether sulfonate(6:2 ClPFESA;C8)were the major sources(43.4%),followed by food packaging as well as coating materials(25.5%).In addition,Spearman correlation analysis and the structural equation model showed that population density significantly impacted the PFAS distribution in the topsoil of Tianjin.

关键词： PFAS Topsoil 6:2 Cl-PFESA Source Distribution

Hybrid Flowshop Scheduling with Interstage Job Transportation

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Journal of the Operations Research Society of China 2014年第1期2卷 109-121页

作者： Wei-ya zhong Long-hua lv Department of Business Administration School of ManagementShanghai University200444 ShanghaiPeople’s Republic of China Department of Mathematics Shanghai University200444 ShanghaiPeople’s Republic of China

There are a variety of joint job production and transportation scheduling problems that arise in modern manufacturing *** this paper,we study one of such problems that arises in a flowshop environment where there are two processing stages and a single transporter that is available to deliver the finished jobs from the first stage to the *** is a single machine in the first stage and two parallel machines in the second *** transporter can carry only one job in each *** job is first processed on the single machine at stage one,then transported to and processed on one of the two parallel machines at stage *** objective is to minimize the makespan,i.e.,the completion time of the last job in the second *** this problem is strongly NP-hard,we propose a fast heuristic and show that the heuristic has a worst-case bound of 5/*** also conduct1 numerical experiments to evaluate the average performance of this heuristic.

关键词： Hybrid flowshop scheduling Transportation Approximation heuristic