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Damage Mecha nism and Counter measures of Al_(2)O_(3)-SiC-C Refractories Un der Extreme Conditions

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China's Refractories 2022年第2期31卷 7-11页

作者： zhu shaojun Shougang Research Institute of Technology Beijing 100041China

This paper analyzes the extreme application conditions of high temperature, high thermal shock and strong erosion of Al_(2)O_(3)-SiC-C refractories for molten iron ladles. It is considered that the main damage mechanism of the refractories is chemical corrosion of oxides (high contents of CaO, FeO and MnO) in the materials, reaction melting erosion, oxidation or decomposition of C or SiC in the materials, melting erosion at high temperatures, and damage under high thermal shock. The analysis results show that the low carbon and low silica Al_(2)O_(3)-SiC-C materials with high oxidation resistance should be used. The ratio of Al_(2)O_(3) to SiO_(2) in the materials should be greater than 2.5, and the andalusite or pyrophyllite with microcracks, Al_(2)O_(3) or Si_(3)N_(4) with in-situ particles or fibers, and the clay or metal with ductility at high temperatures should be added to improve the high temperature corrosion resistance and thermal shock resistance.

关键词： thermal shock resistance corrosion resistance high temperature

One-Step Electrochemical Approach to the Synthesis of Graphene/MnO2 Nanowall Hybrids

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Nano Research 2011年第7期4卷 648-657页

作者： Chengzhou zhu shaojun Guo Youxing Fang Lei Han Erkang Wang shaojun Dong State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun130022 China

We have demonstrated a one-step and effective electrochemical method to synthesize graphene/MnO2 nanowall hybrids （GMHs）. Graphene oxide （GO） was electrochemically reduced to graphene （GN）, accompanied by the simultaneous formation of MnO2 with a nanowall morphology via cathodic electrochemical deposition. The morphology and structure of the GMHs were systematically characterized by scanning electron microscope （SEM）, X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, and Raman spectroscopy. The resulting GMHs combine the advantages of GN and the nanowall array morphology of MnO2 in providing a conductive network of amorphous nanocomposite, which shows good electrochemical capacitive behavior. This simple approach should find practical applications in the large-scale production of GMHs.

关键词： Graphene manganese dioxide nanocomposites electrochemical reduction

Deep reinforcement learning-based critical element identification and demolition planning of frame structures

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Frontiers of Structural and Civil Engineering 2022年第11期16卷 1397-1414页

作者： shaojun zhu Makoto OHSAKI Kazuki HAYASHI Shaohan ZONG Xiaonong GUO College of Civil Engineering Tongji UniversityShanghai 200092China Department of Architecture and Architectural Engineering Kyoto UniversityKyoto 615-8540Japan Tongji Lvjian Co. Ltd.Shanghai 200092China

This paper proposes a framework for critical element identification and demolition planning of frame *** quantitative indices considering the severity of the ultimate collapse scenario are proposed using reinforcement learning and graph *** action is defined as removing an element,and the state is described by integrating the joint and element features into a comprehensive feature vector for each *** establishing the policy network,the agent outputs the Q value for each action after observing the *** numerical examples,it is confirmed that the trained agent can provide an accurate estimation of the Q values,and handle problems with different action spaces owing to utilization of graph ***,different behaviors can be learned by varying hyperparameters in the reward *** comparing the proposed method and the conventional sensitivity index-based methods,it is demonstrated that the computational cost is considerably reduced because the reinforcement learning model is trained ***,it is proved that the Q values produced by the reinforcement learning agent can make up for the deficiencies of existing indices,and can be directly used as the quantitative index for the decision-making for determining the most expected collapse scenario,i.e.,the sequence of element removals.

关键词： progressive collapse alternate load path demolition planning reinforcement learning graph embedding

Elevated temperature creep model of parallel wire strands

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 1060-1071页

作者： Yong DU Yongjin WU Abdullahi M.UMAR shaojun zhu College of Civil Engineering Nanjing Tech UniversityNanjing 211816China College of Civil Engineering Tongji UniversityShanghai 200092China*Corresponding author.E-mail:zhushaojun@***

T Parallel wire strands(PWSs),which are widely used in prestressed steel structures,are typically in highstress *** fire conditions,significant creep effects occur,reducing the prestress and influencing the mechanical behavior of *** there is no existing approach to analyze their creep behavior,this study experimentally investigated the elevated temperature creep model of PWSs.A charge-coupled camera system was incorporated to accurately obtain the deformation of the specimen during the elevated temperature creep *** was concluded that the temperature level had a more significant effect on the creep strain than the stress level,and 450℃ was the key segment point where the creep rate varied *** comparing the elevated temperature creep test results for PWSs and steel strands,it was found that the creep strain of PWSs was lower than that of steel strands at the same temperature and stress *** parameters in the general empirical formula,the Bailey–Norton model,and the composite timehardening model were fitted based on the experimental *** evaluating the accuracy and form of the models,the composite time-hardening model,which can simultaneously consider temperature,stress,and time,is recommended for use in the fire-resistance design of pre-tensioned structures with PWSs.

关键词： parallel wire strands experimental study elevated temperature creep model

Shape optimization of aluminium alloy spherical reticulated shells considering nonlinearities

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Frontiers of Structural and Civil Engineering 2022年第12期16卷 1565-1580页

作者： Wei LIU Lishu XU shaojun zhu Lijuan LI Feng LIU Zhe XIONG School of Civil and Transportation Engineering Guangdong University of TechnologyGuangzhou 510006China School of Advanced Manufacturing Guangdong University of TechnologyJieyang 515231China College of Civil Engineering Tongji UniversityShanghai 200092China Tongji Lvjian Co. LtdShanghai 200092China

This study proposes a shape optimization method for K6 aluminum alloy spherical reticulated shells with gusset joints,considering geometric,material,and joint stiffness *** optimization procedure adopts a genetic algorithm in which the elastoplastic non-linear buckling load is selected as the objective function to be *** confinement of the adjustment range of the controlling points,optimization results have enabled a path toward achieving a larger elastoplastic non-linear buckling load without changing the macroscopic shape of the structure.A numerical example is provided to demonstrate the effectiveness of the proposed *** addition,the variation in structural performance during optimization is *** parametric analysis,practical design tables containing the parameters of the optimized shape are obtained for aluminum alloy spherical shells with common geometric *** explore the effect of material nonlinearity,the optimal shapes obtained based on considering and not considering material non-linear objective functions,the elastoplastic and elastic non-linear buckling loads,are compared.

关键词： shape optimization aluminum alloy spherical reticulated shell non-linear buckling material nonlinearity genetic algorithm

Research and Application of New Non-burned Periclase-magnesia Alumina Spinel Bricks

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China's Refractories 2019年第2期28卷 18-22页

作者： CUI Yuanyuan ZHONG Kai zhu shaojun SHAO Junning Research Institute of Technology of Shougang Group Co. Ltd.Beijing 100043China Beijing Shougang Co. LtdQian’an 064404China

To meet the needs of environmental protection and promote the application of chromium-free refractories for RH refining furnaces, research on application of new non-burned periclase-magnesia alumina spinel bricks was carried out. Through laboratory research and field application, it is concluded that the non-burned periclase-magnesia alumina spinel brick can replace magnesia-chrome material, and its service life is equivalent to that of the magnesia-chrome material with reduced cost.

关键词： periclase-magnesia alumina spinel magnesia-chrome snorkle slag penetration

Synergistic regulation of hydrophobicity and basicity for copper hydroxide-derived copper to promote the CO_(2)electroreduction reaction

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Carbon Energy 2023年第6期5卷 72-81页

作者： Limin Zhou Chenghang Li Jing-Jing Lv Wei Wang shaojun zhu Jun Li Yifei Yuan Zheng-Jun Wang Qingcheng Zhang Huile Jin Shun Wang Wenzhou Key Lab of Advanced Energy Storage and Conversion Zhejiang Province Key Lab of Leather EngineeringCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhouZhejiangChina Zhejiang Engineering Research Center for Electrochemical Energy Materials and Devices Institute of New Materials and Industrial TechnologiesWenzhou UniversityWenzhouZhejiangChina

A simple method was proposed to activate alkaline Cu(OH)_(2)with an acidic ionomer,Nafion,to regulate its surface microenvironment,including hydrophobicity and local *** particular,the direct complete neutralization reaction between Cu(OH)_(2)and Nafion in aqueous solution induces the exposing of vast anions which can exclude the in-situ-formed hydroxides and raise the local ***,the optimal Nafionactivated Cu(OH)_(2)-derived Cu can efficiently suppress the hydrogen evolution reaction(HER)and improve the selectivity for multi-carbon products in the CO_(2)electroreduction reaction(eCO_(2)RR).The H2 Faradaic efficiency(FE)decreased to 11%at a current density of 300 mA/cm2(−0.76 V ***)in a flow cell,while the bare one with H2 had an FE of 40%.The total eCO_(2)RR FE reaches as high as 83%,along with an evidently increased C2H4 FE of 44%as compared with the bare one(24%),and good stability(8000 s),surpassing that of most of the reported Cu(OH)_(2)-derived *** experimental and theoretical results both show that the strong hydrophobicity and high local basicity jointly boosted the eCO_(2)RR as acquired by felicitously introducing ionomer on the Cu(OH)_(2)-derived Cu surface.

关键词： CO_(2)electroreduction reaction Cu(OH)_(2)@Nafion flow cell ionomers multi-carbon products

Injectable Self‑Healing Adhesive pH‑Responsive Hydrogels Accelerate Gastric Hemostasis and Wound Healing

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Nano-Micro Letters 2021年第5期13卷 118-134页

作者： Jiahui He Zixi Zhang Yutong Yang Fenggang Ren Jipeng Li shaojun zhu Feng Ma Rongqian Wu Yi Lv Gang He Baolin Guo Dake Chu Department of Gastroenterology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’anPeople’s Republic of China Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Department of Dermatology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China National Local Joint Engineering Research Center for Precision Surgery and Regenerative Medicine and Surgical Engineering Research Center of Shaanxi Province First Affiliated Hospital of Xi’an Jiaotong UniversityXi’anPeople’s Republic of China Department of Experimental Surgery Xijing HospitalFourth Military Medical UniversityXi’anPeople’s Republic of China Department of Pathology Tangdu HospitalFourth Military Medical UniversityXi’anPeople’s Republic of China

Endoscopic mucosal resection(EMR)and endoscopic submucosal dissection(ESD)are well-established therapeutics for gastrointestinal neoplasias,but complications after EMR/ESD,including bleeding and perforation,result in additional treatment morbidity and even threaten the lives of ***,designing biomaterials to treat gastric bleeding and wound healing after endoscopic treatment is highly desired and remains a ***,a series of injectable pH-responsive selfhealing adhesive hydrogels based on acryloyl-6-aminocaproic acid(AA)and AA-g-N-hydroxysuccinimide(AA-NHS)were developed,and their great potential as endoscopic sprayable bioadhesive materials to efficiently stop hemorrhage and promote the wound healing process was further demonstrated in a swine gastric hemorrhage/wound *** hydrogels showed a suitable gelation time,an autonomous and efficient self-healing capacity,hemostatic properties,and good *** the introduction of AA-NHS as a micro-cross-linker,the hydrogels exhibited enhanced adhesive strength.A swine gastric hemorrhage in vivo model demonstrated that the hydrogels showed good hemostatic performance by stopping acute arterial bleeding and preventing delayed bleeding.A gastric wound model indicated that the hydrogels showed excellent treatment effects with significantly enhanced wound healing with type I collagen deposition,α-SMA expression,and blood vessel *** injectable self-healing adhesive hydrogels exhibited great potential to treat gastric wounds after endoscopic treatment.

关键词： Injectable self-healing hydrogel Adhesive hydrogel Gastric hemostasis Gastric wound healing Endoscopic treatment

铝合金板式节点网壳非破坏性火灾响应试验研究

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建筑结构学报 2021年第6期42卷 72-84页

作者：郭小农陈晨朱劭骏蒋首超同济大学土木工程学院上海200092

为研究铝合金板式节点网壳结构在实际火灾下的响应,针对一网壳缩尺模型进行了结构受火试验。采用柴油油池火作为火源,考虑不同的火源功率、火源位置和通风条件,设计了8个受火场景。在结构受火试验前,进行了两次柴油燃烧特性试验,并将试... 详细信息

为研究铝合金板式节点网壳结构在实际火灾下的响应,针对一网壳缩尺模型进行了结构受火试验。采用柴油油池火作为火源,考虑不同的火源功率、火源位置和通风条件,设计了8个受火场景。在结构受火试验前,进行了两次柴油燃烧特性试验,并将试验结果与经典羽流模型的预测值进行了对比分析。结构受火试验结果表明:空间温度场在大空间火灾下分布不均匀,且火源位置和火源功率对结构温度场分布具有较大影响;在各受火场景中,大功率火源位于结构角部且通风条件不佳时为最不利火灾场景;在该火灾场景下,所测得的最高空气温度为128℃,而杆件和节点板的最高实测温度分别为92℃和84℃;在所有结构模型受火试验过程中,均发现网壳发生起拱变形,但试验结束后变形可恢复,且未观测到其他破坏现象。对试验过程进行数值模拟,结果表明火灾下结构的热膨胀变形可能提升其稳定承载力,因此在设计时建议分别基于有热膨胀变形和无热膨胀变形的结构进行稳定承载力分析,并取两者结果中的较小值作为结构火灾下承载力的设计值。

关键词：铝合金网壳板式节点受火试验火灾响应