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Effects of rare earth elements on microstructure and tensile properties of Al-Si-Cu alloy at 250℃

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China Foundry 2021年第5期18卷 474-480页

作者： Shuai-bo Zhang yong Su Wen-gang gong School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

The effects of rare earth elements(La,Sm)on the high-temperature(250℃)microstructure and mechanical properties of Al-Si-Cu alloys were *** experimental results show that with the addition of La and Sm,theα-Al was significantly refined,and the eutectic Si changed from acicular to rod-like and *** and SEM analysis shows that the rare earth phases in the alloy were mainly AlSiRe and *** morphology observations show the fracture mode of the alloy changes from brittle and ductile fracture to ductile *** the increase of La or Sm contents,the mechanical properties of the alloys at 250℃ increase at first,and then *** the contents of La and Sm are 0.4wt.%and 0.2wt.%,the tensile strength of the alloy reaches maximum of 143.91 MPa and 201.48 MPa,respectively.

关键词： Al-Si-Cu rare earth element microstructure mechanical properties high-temperature stretching

Cationic liposome-mediated transfection of CD40 ligand gene inhibits hepatic tumor growth of hepatocellular carcinoma in mice

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第1期10卷 7-13页

作者： yong-fang JIANG Jing MA Yan HE yong-hong ZHANG Yun XU Guo-zhong gong Center for Liver Diseases the Second Xiangya Hospital Central South University Changsha 410011 China

Objective: To evaluate the efficacy of cationic liposome-mediated CD40 ligand (CD40L) gene therapy for hepato- cellular carcinoma. Methods: 1×106 of parental H22 cells or H22 cells transfected with the expression vector containing murine CD40L cDNA encoding the entire coding region (pcDNA3.1+-mCD40L) were inoculated subcutaneously into the left flanks of syngenic BALB/C mice. The tumor-bearing mice (tumor nodules 10 mm in maximal diameter) received the treatment of the intratumoral injection of pcDNA3.1+-mCD40L/Transfectam, pcDNA3.1+, or phosphate-buffered saline (PBS), or no treatment. The mice were monitored for tumor growth weekly. We examined mCD40L messenger ribonucleic acid (mRNA) expression by reverse transcription polymerase chain reaction (RT-PCR) and the histologic changes in tumors at two weeks after intratumoral injection using immunohistochemical staining of tumor tissues. Results: All mice inoculated with parental H22 cells developed a tumor subcutaneously, and the tumor size increased progressively within three weeks. However, the mice receiving H22-CD40L cells exhibited complete regression of the tumor two weeks after tumor cell inoculation. The tumor-bearing animals with the treatment of pcDNA3.1+ or PBS, or without treatment had progressive tumor growth, while those mice treated with pcDNA3.1+-mCD40L exhibited a significant inhibition of tumor growth. RT-PCR analysis showed that 783-bp fragments cor- responding to the mCD40L mRNA were amplified only from pcDNA3.1+-mCD40L treated tumors. The tumor samples from pcDNA3.1+-mCD40L-treated mice showed significant lymphocyte infiltration, apoptotic bodies, and confluent necrosis in the tumor tissues. Conclusion: The tumorigenicity of CD40L-expressing cells was abrogated when the cells were implanted subcu- taneously. In vivo gene therapy of established liver tumor nodules in mice by the intratumoral injection of pcDNA3.1+-mCD40L led to significant tumor inhibition. There was mCD40L mRNA expression in the

关键词： CD40 ligand gene Hepatocellular carcinoma (HCC) Cationic liposome Transfection

Regulation of surface carbides on palladium nanocubes with zeolitic imidazolate frameworks for propyne selective hydrogenation

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Nano Research 2021年第5期14卷 1559-1564页

作者： Linzhong Wu Mingyu Chu Jin gong Muhan Cao Yu Liu yong Xu Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversityNo.199 Ren’ai RoadSuzhou215123China Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China

The selective hydrogenation of propyne to propylene has attracted great attention in chemical industry for removing trace amount of propyne for producing polymer-grade propylene. As the state-of-the-art catalyst, Pd suffers from the disadvantage of poor propylene selectivity due to the over-hydrogenation of propylene to propane. We here demonstrate that Pd nanocubes (NCs) coated by zeolitic imidazolate frameworks (i.e., Pd NCs@ZIF-8) can serve as highly active and selective catalysts for propyne selective hydrogenation (PSH). Benefitting from the unique properties and abundant groups of ZIF-8, Pd carbide (Pd-C) is formed on the surface of Pd NCs after thermal treatment, which acts the active sites for PSH to propylene. More importantly, the content of Pd-C can be precisely controlled by altering the calcination temperature without aggregation of Pd NCs and obvious changes in the framework of ZIF-8. The formation of Pd-C on Pd NCs@ZIF-8 can strongly suppress the H2 adsorption, and thus selectively catalyze propyne to propylene. Consequently, the optimized catalyst (i.e., Pd NCs@ZIF-8-100) exhibits a propylene selectivity of 96.4% at a propyne conversion of 93.3% at 35 °C and atmospheric pressure. This work may not only provide an efficient catalyst for PSH, but also shed a new light on the catalytic application of ZIFs.

关键词： propyne selective hydrogenation Pd nanocubes zeolitic imidazolate frameworks core-shell nanostructures Pd carbide

Recent Research Progress of n-Type Conjugated Polymer Acceptors and All-Polymer Solar Cells

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Chinese Journal of Polymer Science 2023年第5期41卷 640-651,I0006页

作者： Xiao-Jun Li Guang-Pei Sun Yu-Fei gong yong-Fang Li Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

The active layer of all polymer solar cells(all-PSCs)is composed of a blend of a p-type conjugated polymer(p-CP)as donor and an n-type conjugated polymer(n-CP)as ***-PSCs possess the advantages of light weight,thin active layer,mechanical flexibility,low cost solution processing and high stability,but the power conversion efficiency(PCE)of the all-PSCs was limited by the poor photovoltaic performance of the n-CP acceptors before *** the report of the strategy of polymerized small molecule acceptors(PSMAs)in 2017,the photovoltaic performance of the PSMA-based n-CPs improved rapidly,benefitted from the development of the A-DA’D-A type small molecule acceptors(SMAs).PCE of the all-PSCs based on the PSMA acceptors reached 17%-18%*** this review article,we will introduce the development history of the n-CPs,especially the recent research progress of the ***,the structure-property relationship of the PSMAs is introduced and ***,current challenges and prospects of the n-CP acceptors are analyzed and discussed.

关键词： n-Type conjugated polymers All-polymer solar cells Polymer acceptors Polymerized small molecule acceptors

Highly performed platinum nanosheets synthesized under in situ reaction conditions for hydrogen generation

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Journal of Energy Chemistry 2020年第12期29卷 272-279页

作者： Xiaobing Bao Yutong gong Xiaozhong Zheng Jiayi Chen Shanjun Mao yong Wang Advanced Materials and Catalysis Group Institute of CatalysisZhejiang UniversityHangzhou 310028ZhejiangChina

Surface properties of a catalyst, especially exposed crystal facets and coordination states, directly affect the catalyst's performance. Herein, we illustrate how reaction conditions direct the fabrication of a wellbehaved catalyst with desired structures in the case of hydrogen evolution reaction(HER). Stable adsorbed PtClxions on CNTs are in situ electrochemically reduced into a unique Pt nanosheet structure enclosed by high-index(311) and low-index(200) and(111) facets during HER process. Experimental results and density functional theory(DFT) calculation disclose the function mechanism between these unique structures and reactants. The adsorbed H2 O and reactive species act as capping agents protecting the(311) facet where the dissociation of water molecule is promoted, and the produced H*intermediates favorably combine and release on the nearby low-index Pt sites. The joint collaborations of these active sites afford Pt nanosheets comparable activity to 20 wt% Pt/C and a 12.7-fold over mass activity. These findings provide novel insight into the synthesis of heterogeneous catalysts with high specificity.

关键词： Pt nanosheet Crystal growth Reaction condition Hydrogen evolution Heterogeneous catalysis

Optical properties and cooling performance analyses of single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles

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Science China(Technological Sciences) 2021年第5期64卷 1017-1029页

作者： CHENG ZiMing SHUAI yong gong DaYang WANG FuQiang LIANG HuaXu LI GuiQiang School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information TechnologyHarbin 150001China School of Engineering University of HullHull HU67RXUK

Radiative cooling can achieve cooling effect without consuming any energy by delivering energy into outer space(3K) through"atmospheric window"(8–13 μm). Conventional radiative cooling coating with multi-layer structure was severely restricted during application due to its complex preparation process and high cost. In this study, a single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles was proposed. The algorithm for calculating the radiative properties of the multi-particle system was developed. Monte Carlo ray-tracing method combined with that algorithm was used to solve the radiative transfer equation(RTE) of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) *** effects of particle diameter, volume fraction and coating thickness on radiative cooling performance were analyzed to obtain the best radiative cooling performance. The numerical results indicated that the average reflectivity of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles in the solar spectrum can reach 95.6%, while and the average emissivity in the "atmospheric window" spectrum can reach 94.9% without additional silver-reflectance layer. The average reflectivity in the solar spectrum and average emissivity in the "atmospheric window" spectrum of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles can increase 4.6% and 4.8% compared to the double-layer radiative cooling coating. This numerical research results can provide a theoretical guidance for design and optimization of single-layer radiative cooling coatings containing mixed nanoparticles.

关键词： radiative cooling optical property multi-particles cooling performance radiative transfer atmospheric window

Preface to the special issue on tungsten-and molybdenum-based two-dimensional materials for energy storage and conversion

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Tungsten 2020年第2期2卷 107-108页

作者： yong‑Ji gong Zheng Liu School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 637371Singapore

Dramatically increased atmospheric CO_(2) level leads to apparent global climate change,which is an urgent and unpredictable threat to human *** new energies to replace traditional fossil energy is critical for sustainable *** example,hydrogen is deemed as a clean and renewable energy alternative to fossil ***,electricity will play an increasingly critical role in the future in terms of its low cost,diverse sources and wide applications and storage of electric energy is crucial for the *** the energy density of lithium-based batteries is the key to satisfy the continuously growing energy demands for electric vehicles,portable electronic devices and smart grid ***,Li-S batteries have much higher energy density than that of traditional Liion batteries,which are the most promising energy storage devices in the future.

关键词： molybdenum replace lithium

Correlation analyse between thyroid hormone levels and severity of schizophrenia symptoms

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World Journal of Psychiatry 2025年第1期15卷 63-71页

作者： Qi-Hui Jiang Wei-Dong gong Department of Endocrinology and Metabolism Hengyang Central HospitalHengyang 421000Hunan ProvinceChina Breast Tumor Surgical Outpatient Hengyang Central HospitalHengyang 421000Hunan ProvinceChina

BACKGROUND The imbalance of hormone levels in the body is closely related to the occurrence and progression of schizophrenia,especially thyroid *** To study the relationship between triiodothyronine(T3),thyroxine(T4),free T3(FT3),free T4(FT4),thyroid stimulating hormone(TSH)and *** In this study,100 schizophrenia patients were selected from our hospital between April 2022 and April *** clinical data were analyzed *** on the Positive and Negative Syndrome Scale(PANSS)score,patients were divided into mild(1-3 points,n=39),moderate(4 points,n=45),and severe groups(5-7 points,n=16).Additionally,55 healthy individuals served as a control *** blood samples were collected to measure T3,T4,FT3,FT4,TSH,and cortisol concentrations,analyzing their relationship with PANSS *** The serum levels of T3,FT3,FT4,TSH and cortisol in the schizophrenia group were lower than those in the control group(P<0.05).With the increase of the severity of the disease,the concentrations of T3 and T4 decreased,while the con-centrations of TSH and cortisol increased(P<0.05).The concentrations of TSH and cortisol were positively correlated with the PANSS score,while T3 and T4 were negatively correlated with the PANSS score(P<0.05).The receiver ope-rating characteristic curve results showed that T3,T4,TSH,and cortisol had good efficacy in the diagnosis of *** results showed that decreased T3 level,decreased T4 level,decreased TSH level and increased cortisol level may be independent risk factors for *** Thyroid hormone levels are associated with the severity of schizophrenia symptoms,which can provide new solutions for the diagnosis and treatment of schizophrenia.

关键词： Thyroid hormone Schizophrenia Symptom severity Positive and Negative Syndrome Scale score Cortisol

Importance of Weighting for Multi-Variable Habitat Suitability Index Model: A Case Study of Winter- Spring Cohort of Ommastrephes bartramii in the Northwestern Pacific Ocean

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Journal of Ocean University of China 2012年第2期11卷 241-248页

作者： gong Caixia CHEN Xinjun GAO Feng CHEN yong College of Marine Sciences Shanghai Ocean University999 Hucheng Ring RoadLingang New CityShanghai 201306China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education999 Hucheng Ring RoadShanghai 201306China School of Marine Sciences University of MaineOronoMaine 04469USA

Weighting values for different habitat variables used in multi-factor habitat suitability index (HSI) modeling reflect the relative influences of different variables on distribution of fish species. Using the winter-spring cohort of neon flying squid (Ommastrephes bartramii) in the Northwestern Pacific Ocean as an example, we evaluated the impact of different weighting schemes on the HSI models based on sea surface temperature, gradient of sea surface temperature and sea surface height. We compared differences in predicted fishing effort and HSI values resulting from different weighting. The weighting for different habitat variables could greatly influence HSI modeling and should be carefully done based on their relative importance in influencing the resource spatial distribution. Weighting in a multi-factor HSI model should be further studied and optimization methods should be developed to improve forecasting squid spatial distributions.

关键词： weighting multi-factors habitat suitability index model Ommastrephes bartramii Northwestern Pacific Ocean