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Advances in medical treatment for pancreatic neuroendocrine neoplasms

World Journal of Gastroenterology 2022年第20期28卷 2163-2175页

作者： yuan-Liang Li Zi-Xuan cheng Fu-Huan Yu chao Tian Huang-Ying Tan Department of Integrative Oncology China-Japan Friendship HospitalBeijing 100029China Graduate School Beijing University of Chinese MedicineBeijing 100029China

Pancreatic neuroendocrine neoplasms(PanNENs)are rare neoplasms with strong heterogeneity that have experienced an increasing incidence rate in recent *** patients with locally advanced or distant metastatic PanNENs,systemic treatment options vary due to the different differentiations,grades and *** available options for systemic therapy include somatostatin analogs,molecularly targeted agents,cytotoxic chemotherapeutic agents,immune checkpoint inhibitors,and peptide receptor radionuclide *** addition,the development of novel molecularly targeted agents is currently in *** sequence of selection between different chemotherapy regimens has been of great interest,and resistance to chemotherapeutic agents is the major limitation in their clinical *** agents and high-level clinical evidence continue to emerge in the field of antiangiogenic *** receptor radionuclide therapy is increasingly employed for the treatment of advanced neuroendocrine tumors,and greater therapeutic efficacy may be achieved by emerging radiolabeled *** immune checkpoint inhibitor monotherapies for PanNENs appear to have limited antitumor activity,dual immune checkpoint inhibitor therapies or combinations of antiangiogenic therapies and immune checkpoint inhibitors have been applied in the clinic to improve clinical *** the use of a variety of agents with different mechanisms of action provides new possibilities for clinical *** the future,the study of systemic therapies will continue to focus on the screening of the optimal benefit population and the selection of the best treatment sequence strategy with the aim of truly achieving individualized precise treatment of PanNENs.

关键词： Pancreatic neuroendocrine neoplasms Advanced neuroendocrine tumors Medical treatment Peptide receptor radionuclide therapy Advances

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Supercritical gasification for the treatment of o-cresol wastewater

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Journal of Environmental Sciences 2006年第4期18卷 644-649页

作者： WEI chao-hai HU cheng-sheng WU chao-fei YAN Bo College of Environmental Science and Technology South China University of Technology Guangzhou 510640 China

The supercritical water gasification of phenolic wastewater without oxidant was performed to degrade pollutants and produce hydrogen-enriched gases. The simulated o-cresol wastewater was gasified at 440-650℃ and 27.6 MPa in a continuous Inconel 625 reactor with the residence time of 0.42-1.25 min. The influence of the reaction temperature, residence time, pressure, catalyst, oxidant and the pollutant concentration on the gasification efficiency was investigated. Higher temperature and longer residence time enhanced the o-cresol gasification. The TOC removal rate and hydrogen gasification rate were 90.6% and 194.6%, respectively, at the temperature of 650℃ and the residence time of 0.83 min. The product gas was mainly composed of H2, CO2, CFL and CO, among which the total molar percentage of H2 and CFL was higher than 50%. The gasification efficiency decreased with the pollutant concentration increasing. Both the catalyst and oxidant could accelerate the hydrocarbon gasification at a lower reaction temperature, in which the catalyst promoted H2 production and the oxidant enhanced CO2 generation. The intermediates of liquid effluents were analyzed and phenol was found to be the main composition. The results indicate that the supercritical gasification is a promising way for the treatment of hazardous organic wastewater.

关键词： supercritical water gasification o-cresol hydrogen-enriched gas wastewater treatment

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Reduction of dinitrogen to ammonia on doped three-atom clusters Nb_(2)M(M=Sc to Cu & Y to Ag)

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Rare Metals 2024年第8期43卷 3810-3818页

作者： Ran cheng chao-Nan Cui Zhi-Xun Luo Beijing National Laboratory for Molecular Science(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China

Catalytic reduction of dinitrogen to ammonia under mild conditions remains an attractive topic for the purpose of lowering energy ***-atom metal clusters have been proved an ideal model to explore highly efficient catalysts taking advantage of unique geometric/electronic structures and cooperative active *** a study of N2 activation and reduction on seventeen bimetallic Nb_2M(M=Sc to Cu,and Y to Ag) clusters was *** key processes for ammonia fixation(namely nitrogen activation,hydrogenation,and ammonia desorption) are fully studied,and three preferred systems(Nb_2Ni,Nb_2Rh and Nb_2Pd) are highlighted with outstanding catalytic *** d-σ and d-π~* orbital hybridizations between these metal clusters and N_(2) were demonstrated and the internal association with the N≡N bond activation was *** examining the ammonia synthesis on four chosen Nb_(2)M clusters(M=Fe,Ni,Rh and Pd),it can be elucidated that the distal pathway is more favorable than the alternative pathway in these *** work not only clarifies the N_(2) reduction on the bimetallic Nb_(2)M clusters,but also guides efficient bimetallic catalyst design.

关键词： Three-atom cluster catalysis Three-criteria strategy Nitrogen fixation Ammonia synthesis Theoretical calculations

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Integrated Configuration and Control Strategy for PV Generation in Railway Traction Power Supply Systems

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1603-1612页

作者： Peng cheng Huiwen Kong chao Wu Jing Ma China Institute of Energy and Transportation Integrated Development North China Electric Power UniversityBeijing 102206China Department of Electrical Engineering Shanghai Jiao Tong UniversityShanghai200240China department of energy Aalborg UniversityAalborg 9220Denmark

Recently,electric railways have experienced a rapid development causing an increasing power *** to the flexible installation available at trackside land along railways,photovoltaic(PV)generation is suggested as an extension to the traction power supply system(TPSS)in ***,this paper proposes a three-phase integrated configuration for PV generation connected to a two-phase traction network and the on-site consumption of solar resources alongside *** this configuration,another inverse V/V transformer is used to maintain a balanced three-phase low voltage(LV)AC bus from a two-phase traction *** is more convenient for accessing PV generation ***,in order to mitigate the negative sequence currents caused by electric trains,an individual phase current(IPC)control strategy for PV converters is developed for power quality *** can not only supply the locomotive with asymmetrical currents,but also provide feedback to the grid through symmetrical *** the implementation and calculations are conducted in the three-phase stationary reference frame without any sequence extracting and power ***,simulation results are presented to validate the effectiveness of the proposed IPC control strategy.

关键词： Current control individual phase current(IPC) photovoltaic(PV)converter railway traction network

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Alloying design and microstructural control strategies towards developing Mg alloys with enhanced ductility

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Journal of Magnesium and Alloys 2022年第5期10卷 1191-1206页

作者： Zhong-Zheng Jin Min Zha Si-Qing Wang Shi-chao Wang cheng Wang Hai-Long Jia Hui-yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityNo.5988 Renmin StreetChangchun 130025China International Center of Future Science Jilin UniversityChangchun 130012China State Key Laboratory of Superhard Materials Jilin UniversityChangchun 130012China

Nowadays,magnesium(Mg)alloys are promising lightweight structural materials,especially in transportation and aerospace fields,due to their inherent low density and high specific *** of the high-strength Mg alloys exhibit poor formability and ductility at room temperature,which limit their wide ***,by proper alloying design and/or delicate microstructural control,some newly developed Mg alloys,including rare-earth(RE)and RE-free ones,show enhanced ductility without significant loss of *** identify the critical reasons,recent researches on ductile Mg alloys have been reviewed from the aspects of alloying design strategies and microstructural control via advanced processing ***,some outlooks on enhanced ductility of Mg alloys are suggested,*** the beneficial effect of solute atoms,introducing second phase particles,tailoring bimodal-grained structures,introducing pre-twinning structures,*** current research progresses in alloying design and/or novel microstructural control have shed some lights on designing and producing Mg alloys with enhanced ductility.

关键词： Mg alloys Alloying Microstructure Ductility Strength

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Recent Advances on the Corrosion Resistance of Low-Density Steel:A Review

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1055-1067页

作者： chao Liu Yilun Li Xuequn cheng Xiaogang Li Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China

This paper reviews the previous literature on the alloy composition design of low-density steel(LDS),focusing on the eff ect of Al,Mn,Ni,and other alloy elements on the formation of the steel matrix and second phase,and provides classifi *** microstructure of LDS after processing includes the matrix structure,к-carbide,and B2(FeAl,NiAl,or MnAl)phase of ferritic LDS,austenitic LDS,and dual-phase *** infl uence of alloy elements on the corrosion resistance of LDS is derived from the addition of Al and Mn for ***,the infl uence of Cr and Mo addition on the corrosion resistance improvement was *** electrochemical properties of the corrosion process in LDS are ***,the microstructure of LDS aff ects the corrosion resistance properties including pitting corrosion,hydrogen embrittlement,and SCC(stress corrosion cracking).Finally,future research directions are proposed.

关键词： Low-density steel Alloy element adjustment Microstructure Corrosion resistance

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Role of Martensite Structural Characteristics on Corrosion Features in Ni-Advanced Dual-Phase Low-Alloy Steels

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 802-812页

作者： chao Hai Xuequn cheng Cuiwei Du Xiaogang Li Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

The relationship between the corrosion resistance and martensite structure of Ni-advanced dual-phase weathering steel was studied using transmission electron microscopy,scanning electron microscopy,electrochemical analysis,and atomic force *** investigations indicate that the final microstructure of the dual-phase weathering steel was composed of a large amount of low-carbon lath martensite distributed in the ferrite *** potential of the martensite phase is higher than that of ferrite,which acts as a *** the martensite volume fraction in the Ni-advanced dual-phase weathering steel increased,the corrosion rate increased owing to the greater galvanic couple formed between the ferrite and martensite from the increasing ratio of the cathode area to the anode *** addition,this work provides a method to obtain advanced weathering steel with improved mechanical properties and corrosion resistance.

关键词： Weathering steel Corrosion Martensite Dual phase Galvanic couple

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Microstructure and property of laser additive manufactured alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si after aged at different temperatures

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Rare Metals 2024年第5期43卷 2275-2281页

作者： Guo-chao Li Xu cheng Hua-Ming Wang National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

The solid solution and aging treatment for conventional manufacturing processes might not be suitable for laser additive manufactured titanium alloys due to the different lamellar *** this study,the influence of aging temperatures(600,700 and 800°C)on microstructure and mechanical properties of titanium alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si was *** results indicate that after solid solution treatment at 970°C followed by water quenching,the alloy mainly consists of coarsening lamellar a phase in martensite α' *** at 600°C will not change the size of primary lamellar α phase but lead to huge amount of secondary a phases(α_(s))generating with very fine *** increasing the aging temperature,the number of α_(s) decreases but with coarsened *** aged at 800°C,the width of the asphase reaches 350 nm,almost 7 times wider than that aged at 600°*** changing size of α_(s) obviously influences the property of the *** fine α_(s) leads to high strength and microhardness but low plasticity,and specimen aged at 700°C with suitable assize has the best comprehensive properties.

关键词： α+βtitanium alloy Laser additive manufacturing Solid solution and aging treatment Microstructure Room temperature tensile property

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Molar Mass Dispersity Control by lodine-mediated Reversibledeactivation Radical Polymerization

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Chinese Journal of Polymer Science 2021年第9期39卷 1155-1160页

作者： Jin-Ying Wang yuan-yuan Ni Jian-Nan cheng Li-Fen Zhang Zhen-Ping cheng State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Suzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Dispersity(D)of polymers has a great effect on the properties of polymeric materials,and therefore how to control θ is very important but still a huge challenge in polymer synthesis,especially for reversible-deactivation radical polymerization(RDRP)***,we successfully developed a novel strategy to adjust D of polymers by visible light-controlled reversible complexation mediated living radical polymerizatio n(RCMP)and combi nation of single-electron transfer-degenerative chain tran sfer living radical polymerization(SET-DTLRP)at room *** RCMP system,2-iodo-2-methylpropionitrile(CP-I)and ethyl 2-iodo-2-phenylacetate(EIPA)were used as alkyl iodide initiators,by using methyl methacrylate(MMA)as the model monomer and n-butylacrylate(BA)as the end-capping reagent to regulate D of ***,we successfully prepared the block copolymer PMMA-b-PBA with adjustable D by reactivating the polymer end-chains via SET-DTLRP in the presence of copper wire,fully dem on strati ng that it is a promising strategy that can keep the"living"feature of polymers while regulating their molar mass dispersities easily.

关键词： Dispersity control lodine-mediated reversible-deactivation radical polymerization(RDRP) Visible light-controlled polymerization Reversible complexation mediated living radical polymerization(RCMP) Single-electron transfer-degenerative chain transfer living radical polymerization(SET-DTLRP)

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Spin-modulated near-infrared-Ⅰ emission in a xanthene-decorated Fe(Ⅱ) spin-crossover complex

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Science China Chemistry 2025年

作者： cheng Yi Duyong Chen Shihui Zhang Rui Cai Chunying Duan Yinshan Meng Tao Liu State Key Laboratory of Fine Chemicals Frontier Science Center for Smart Materials and Chemical Engineering School of Chemical Engineering Dalian University of Technology Instrumental Analysis Center Dalian University of Technology School of Chemistry Dalian University of Technology Liaoning Binhai Laboratory

Molecular materials showing synergetic coupling of near-infrared （NIR） fluorescence and spin-crossover （SCO） are promisingly applicable in in-vivo bioimaging,temperature sensing,and spintronic *** the related study faces formidable *** this work we graft the NIR fluorophore xanthene onto the dipyridyl substituted triazole ligand and construct a new Febased SCO material,{FeⅡ（ddxc-abpt）2[N（CN）2]2}(1,ddxc-abpt:（E）-4-(((3,5-di（pyridin-2-yl）-4H-1,2,4-triazol-4-yl)imino)methyl)-N,N-diethyl-2,3-dihydro-1H-xanthen-6-amine).Magnetic studies indicate that compound 1 exhibits thermally induced SCO property in both the solid and solution ***-temperature fluorescence emission spectra reveal a remarkable 7-fold increase in photoluminescence intensity upon the transition from the low-spin state at 110 K to the high-spin state at 280 K,which is the record of all reported coupled fluorescence-SCO ***-temperature ultraviolet-visible （UV-Vis）absorption spectra show a significant change in absorption intensity within the fluorescence emission window,consistent with the F?rster resonance energy transfer （FRET） ***-dependent density functional theory （TD-DFT） calculations demonstrate that the strong coupling is attributed to disrupted energy transfer between the xanthene fluorophore and high-spin *** work provides a feasible approach for expanding the synergetic SCO-fluorescence materials to the NIR-Iwavelength region,and hopefully contributes to the applications of tunable NIR-SCO molecule-based sensors and devices.

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