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低合金高强度钢焊接热影响区性能研究现状及改善措施

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焊管 2024年第6期47卷 7-16页

作者：甘正红赵海林李学达孙宪进张坤鹏江苏德创制管有限公司江苏兴化225700 南通振华重型装备制造有限公司江苏南通226000 中国石油大学(华东)材料科学与工程学院山东青岛266580 江阴兴澄特种钢铁有限公司江苏江阴214429 番禺珠江钢管(连云港)有限公司江苏连云港222006

低合金高强度钢焊接热影响区各区域因经历了不同的焊接热循环过程,组织发生显著改变,从而引起性能恶化,导致焊接热影响区成为焊接接头最薄弱的区域。针对低合金高强钢焊接热影响区性能的硬化、脆化和软化以及冷裂纹敏感性差异较大等问题... 详细信息

低合金高强度钢焊接热影响区各区域因经历了不同的焊接热循环过程,组织发生显著改变,从而引起性能恶化,导致焊接热影响区成为焊接接头最薄弱的区域。针对低合金高强钢焊接热影响区性能的硬化、脆化和软化以及冷裂纹敏感性差异较大等问题,分析总结了影响热影响区性能变化的关键因素,包括焊接热循环、焊接工艺条件、母材的化学成分和原始组织状态等,提出采用焊接热模拟技术、合理的母材成分设计、原始组织状态、焊接工艺参数优化等措施,以改善和提高焊接热影响区综合性能。

关键词：低合金高强钢热影响区焊接工艺

热处理工艺及Nb微合金化对9Ni钢组织性能的影响

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特殊钢 2024年第3期45卷 70-74页

作者：刘朝霞孙宪进刘俊叶建军王柯徐光琴江阴兴澄特种钢铁有限公司研究院江阴214400

为了适应LNG燃料罐、储罐使用需要,对9Ni钢进行冶炼、轧制关键工艺控制,研究两相区热处理工艺及Nb微合金化对组织性能的影响。结果表明,随着亚温淬火温度的升高,屈服强度、抗拉强度、屈强比先降低后升高。随着回火温度的升高,屈服强度... 详细信息

为了适应LNG燃料罐、储罐使用需要,对9Ni钢进行冶炼、轧制关键工艺控制,研究两相区热处理工艺及Nb微合金化对组织性能的影响。结果表明,随着亚温淬火温度的升高,屈服强度、抗拉强度、屈强比先降低后升高。随着回火温度的升高,屈服强度与抗拉强度逐渐降低,伸长率升高;当回火温度为600℃时,屈服强度与抗拉强度达到最低值,伸长率达到最高值。亚温淬火态组织呈现大、小晶粒并存状态,有助于降低钢板屈强比。Nb微合金化9Ni钢板成品组织主要为回火索氏体组织及3%~8%残余奥氏体。0.015%Nb的加入使9Ni钢平均屈服强度提高约50 MPa,抗拉强度提高约40 MPa,-196℃横向夏比V型冲击吸收能提高约40 J。

关键词： LNG Nb微合金化 9Ni钢回火索氏体

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Recent progress of MgO-based materials in CO_(2) adsorption and conversion:Modification methods,reaction condition,and CO_(2) hydrogenation

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Chinese Chemical Letters 2024年第5期35卷 57-65页

作者： Zixuan Zhu xianjin Shi Yongfang Rao Yu Huang Key Laboratory of Aerosol Chemistry&Physics State Key Laboratory of Loess and Quaternary Geology(SKLLQG)Institute of Earth EnvironmentChinese Academy of Sciences(CAS)Xi’an 710061China Center for Excellence in Quaternary Science and Global Change Chinese Academy of SciencesXi’an 710061China University of Chinese Academy of Sciences Beijing 100049China Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China

Integrated CO_(2) capture and conversion of(ICCC)is one of the most effective solutions to reduce anthropogenic CO_(2) emissions,which has attracted extensive public *** functional materials(DFMs),including adsorbent and catalyst,are the key components to achieve *** oxide(MgO)is an ideal adsorbent for ICCC,since it is characterized by high theoretical adsorption capacity,low cost,low energy consumption and extensive *** can also be used as DFMs in combination with the Ni *** not only can act as an adsorbent in DFMs but also enhance the catalytic performance of *** review summarizes the advantages and modification methods of MgO as adsorbent and the influence of its adsorption conditions on the adsorption ***,the important role of MgO in facilitating the catalytic conversion of CO_(2) is *** research focuses are proposed for the development of MgO based DFMs with high adsorption capacity,high stability,conversion,and selectivity as well as low cost and energy consumption.

关键词： CO_(2) ICCC MgO Adsorption Conversion

Promoted surface charge density from interlayer Zn–N_(4) configuration in carbon nitride for enhanced CO_(2) photoreduction

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Nano Research 2024年第4期17卷 2400-2409页

作者： xianjin Shi Yu Huang Gangqiang Zhu Wei Peng Meijuan Chen State Key Laboratory of Loess and Quaternary Geology(SKLLQG) Key Laboratory of Aerosol Chemistry and PhysicsInstitute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China Center of Excellence in Quaternary Science and Global Change Chinese Academy of SciencesXi’an 710061China University of Chinese Academy of Sciences Beijing 100049China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an 710049China

The solar-driven reduction of CO_(2) into valuable products is a promising method to alleviate global environmental problems and energy ***,the low surface charge density limits the photocatalytic conversion performance of CO_(2).Herein,a polymeric carbon nitride(PCN)photocatalyst with Zn single atoms(Zn1/CN)was designed and synthesized for CO_(2) *** results of the CO_(2) photoreduction studies show that the CO and CH_(4) yields of Zn1/CN increased fivefold,reaching 76.9 and 22.9μmol/(g·h),respectively,in contrast to the unmodified ***+plasma-etched X-ray photoelectron spectroscopy and synchrotron radiation-based X-ray absorption fine structure results reveal that Zn single atom is mainly present in the interlayer space of PCN in the Zn–N_(4) *** characterizations indicate that the interlayer Zn–N_(4) configuration can amplify light absorption and establish an interlayer charge transfer ***-assisted Kelvin probe force microscopy confirms that more photogenerated electrons are delivered to the catalyst surface through interlayer Zn–N_(4) configuration,which increases its surface charge ***,in-situ infrared spectroscopy combined with density functional theory calculation reveals that promoted surface charge density accelerates key intermediates(*COOH)conversion,thus achieving efficient CO_(2) *** work elucidates the role of internal single atoms in catalytic surface reactions,which provides important implications for the design of single-atom catalysts.

关键词： single-atom catalysts photocatalytic CO_(2)reduction interlayer modification charge transfer dynamics surface charge density

Study on a Fuzzy Reasoning Algorithm

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Journal of Systems Engineering and Electronics 1999年第2期10卷 15-19页

作者： Liang, Yun Zuo, Xiaode sun, xianjin Wang, Huifen Hu, Dongpo College of Management Jinan University Guangzhou 510632 P. R. China

This paper presents a kind of inexact inference methodology, and gives a calculation algorithm. The algorithm can be distinguished not only between exact and inexact inference, but also in conditions of inference betw... 详细信息

关键词： Inexact inference Calculation method Degree of belief.

Sustainable all-weather CO2 utilization by mimicking natural photosynthesis in a single material

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National Science Review 2024年第2期11卷 177-187页

作者： xianjin Shi Yu Huang Ran Long Zhenyu Wang Liqin Wang Junji Cao Gangqiang Zhu Yujie Xiong State Key Laboratory of Loess and Quaternary Geology(SKLLQG) Key Laboratory of Aerosol Chemistry and Physics Institute of Earth EnvironmentChinese Academy of Sciences Center of Excellence in Quaternary Science and Global Change Chinese Academy of Sciences University of Chinese Academy of Sciences Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory University of Science and Technology of China Institute of Atmospheric Physics Chinese Academy of Sciences School of Physics and Information Technology Shaanxi Normal University

Solar-driven CO2conversion into hydrocarbon fuels is a sustainable approach to synchronously alleviating the energy crisis and achieving net ***,the dependence of the conversion process on solar illumination hinders its practical application due to the intermittent availability of sunlight at night and on cloudy or rainy ***,we report a model material of Pt-loaded hexagonal tungsten trioxide（Pt/h-WO3） for decoupling light and dark reaction processes,demonstrating the sustainable CO2conversion under dark conditions for the first *** such a material system,hydrogen atoms can be produced by photocatalytic water splitting under solar illumination,stored together with electrons in the h-WO3through the transition of W6+to W5+and spontaneously released to trigger catalytic CO2reduction under dark ***,we demonstrate using natural light that CH4production can persist at night and on rainy days,proving the accomplishment of all-weather CO2conversion via a sustainable way.

关键词： sustainable CO2 utilization artificial photosynthesis all-weather application charge storage

Micro-aluminum powder with bi-or tri-component alloy coating as a promising catalyst:Boosting pyrolysis and combustion of ammonium perchlorate

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Defence Technology（防务技术） 2024年第3期33卷 100-113页

作者： Chao Wang Ying Liu Mingze Wu Jia Li Ying Feng xianjin Ning Hong Li Ningfei Wang Baolu Shi School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

A novel design of micro-aluminum(μAl)powder coated with bi-/tri-component alloy layer,such as:Ni-P and Ni-P-Cu(namely,Al@Ni-P,Al@Ni-P-Cu,respectively),as combustion catalysts,were introduced to release its huge energy inside Al-core and promote rapid pyrolysis of ammonium perchlorate(AP)at a lower temperature in aluminized *** microstructure of Al@Ni-P-Cu demonstrates that a three-layer Ni-P-Cu shell,with the thickness of~100 nm,is uniformly supported byμAl carrier(fuel unit),which has an amorphous surface with a thickness of~2.3 nm(catalytic unit).The peak temperature of AP with the addition of Al@Ni-P-Cu(3.5%)could significantly drop to 316.2℃ at high-temperature thermal decomposition,reduced by 124.3℃,in comparison to that of pure AP with 440.5℃.It illustrated that the introduction of Al@Ni-P-Cu could weaken or even eliminate the obstacle of AP pyrolysis due to its reduction of activation energy with 118.28 kJ/*** laser ignition results showed that the ignition delay time of Al@Ni-P-Cu/AP mixture with 78 ms in air is shorter than that of Al@Ni-P/AP(118 ms),decreased by 33.90%.Those astonishing breakthroughs were attributed to the synergistic effects of adequate active sites on amorphous surface and oxidation exothermic reactions(7597.7 J/g)of Al@Ni-P-Cu,resulting in accelerated mass and/or heat transfer rate to catalyze AP pyrolysis and ***,it is believed to provide an alternative Al-based combustion catalyst for propellant designer,to promote the development the propellants toward a higher energy.

关键词： Micro-aluminum powder(μAl) Nano-sized alloy coating Combustion catalyst Ammonium perchlorate Pyrolysis behavior Ignition and combustion

Regulable toehold lock for the effective control of strand displacement reaction sequence and circuit leakage

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Chinese Chemical Letters 2024年第7期35卷 372-376页

作者： Kuangdi Luo Yang Qin Xuehao Zhang Hanxu Ji Heao Zhang Jiangtian Li xianjin Xiao Xinyu Wang Department of Breast Surgery Second Hospital of Jilin UniversityChangchun 130041China Institute of Reproductive Health Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Laboratory Medicine Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Pancreatic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China School of Life Science and Technology Wuhan Polytechnic UniversityWuhan 430023China

Strand displacement reaction enables the construction of enzyme-free DNA reaction networks,thus has been widely applied to DNA circuit and *** has the characteristics of high efficiency,universality and ***,the existing regulation tools cannot enable effective control of the reaction sequence,which undoubtedly limits the construction of complex nucleic acid ***,we developed a regulation tool,toehold lock,and achieved strict control of reaction sequence without loss of the main reaction signal ***,we applied the tool to scenarios such as seesaw circuits,AND/OR logic gates,and entropy-driven circuits,and respectively demonstrated its significant superiority compared to the original *** believe that the proposed toehold lock has greatly optimized the efficiency of DNA strand displacement-based networks,and we anticipate that the tool will be widely used in multiple fields.

关键词： DNA circuit Toehold lock DNA strand displacement Reaction sequence Seesaw circuit

The Application of Bilayer Artificial Dermis Combined with VSD Technology in Chronic Wounds

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Journal of Biosciences and Medicines 2024年第3期12卷 238-244页

作者： xianjin Dong Huasong Luo Traumatology Orthopedics The First Affiliated Hospital of Yangtze University Jingzhou China

Background: Bilayer artificial dermis promotes wound healing and offers a treatment option for chronic wounds. Aim: Examine the clinical efficacy of bilayer artificial dermis combined with Vacuum Sealing Drainage (VSD) technology in the treatment of chronic wounds. Method: From June 2021 to December 2023, our hospital treated 24 patients with chronic skin tissue wounds on their limbs using a novel tissue engineering product, the bilayer artificial dermis, in combination with VSD technology to repair the wounds. The bilayer artificial dermis protects subcutaneous tissue, blood vessels, nerves, muscles, and tendons, and also promotes the growth of granulation tissue and blood vessels to aid in wound healing when used in conjunction with VSD technology for wound dressing changes in chronic wounds. Results: In this study, 24 cases of chronic wounds with exposed bone or tendon larger than 1.0 cm2 were treated with a bilayer artificial skin combined with VSD dressing after wound debridement. The wounds were not suitable for immediate skin grafting. At 2 - 3 weeks post-treatment, good granulation tissue growth was observed. Subsequent procedures included thick skin grafting or wound dressing changes until complete wound healing. Patients were followed up on average for 3 months (range: 1 - 12 months) post-surgery. Comparative analysis of the appearance, function, skin color, elasticity, and sensation of the healed chronic wounds revealed superior outcomes compared to traditional skin fl repairs, resulting in significantly higher satisfaction levels among patients and their families. Conclusion: The application of bilayer artificial dermis combined with VSD technology for the repair of chronic wounds proves to be a viable method, yielding satisfactory therapeutic effects compared to traditional skin flap procedures.

关键词： Bilayer Artificial Dermis Vacuum Sealing Drainage (VSD) Chronic Wounds Wound Healing Application