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固体火箭发动机低易损技术研究进展

化学推进剂与高分子材料 2024年第2期22卷 1-7,42页

作者：胡丰泽冀占慧高建兵王佳郝平马鹤海军装备部内蒙古包头014000 内蒙合成化工研究所内蒙古呼和浩特F010010

基于国外低易损固体推进剂研究,对低易损性概念、低易损固体火箭发动机关键技术现状,以及低易损性试验标准、缩比试验方法、仿真模拟等进行了综述分析。对国内低易损技术理论研究需完善的问题,从数值模拟仿真、新型低易损推进剂研制、... 详细信息

基于国外低易损固体推进剂研究,对低易损性概念、低易损固体火箭发动机关键技术现状,以及低易损性试验标准、缩比试验方法、仿真模拟等进行了综述分析。对国内低易损技术理论研究需完善的问题,从数值模拟仿真、新型低易损推进剂研制、固体火箭发动机设计技术、低易损试验表征技术及相关评价等方面提出了技术建议。

关键词：低易损固体推进剂固体火箭发动机评估

CBL结合PBL教学方法在儿科护理急救能力中的运用

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检验医学与临床 2024年第S1期21卷 95-98页

作者：张晶王聪吴蓓蓓王晨烨祝秋萍郝平上海中医药大学附属普陀医院上海200062

目的想通过以案例为基础的教学方法(CBL)结合以问题为基础的教学(PBL)的教学方法在儿科护理急救操作进行护理学院课堂授课及演练,以此来提升护生的急救应变能力,更好地为进入临床工作做好准备。方法选取该院2023年1月至9月护理学院护理... 详细信息

目的想通过以案例为基础的教学方法(CBL)结合以问题为基础的教学(PBL)的教学方法在儿科护理急救操作进行护理学院课堂授课及演练,以此来提升护生的急救应变能力,更好地为进入临床工作做好准备。方法选取该院2023年1月至9月护理学院护理本科2个班级共80名护理学生进行儿科教学带教。结果两组护生进行不同的教学方法的授课后,理论及操作成绩比较(P0.05),培训后比较差异有统计学意义(P<0.001),实验组较常规组自自我效能感高。结论CBL结合PBL教学方法在儿科护理急救能力中的运用能够提升护生的理论及操作成绩并且体验到较高的一般自我效能,值得在临床的儿科急救护理教学中进行分享推广。

关键词： CBL PBL 儿科护理急救能力

Effect of different bottom blowing elements on stirring characteristics of molten bath in converter

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Journal of Iron and Steel Research International 2024年第2期31卷 368-376页

作者： Ming Lv Shuang-ping Chen Hong-min Guo Yi-jie hao Xiang-dong Xing School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina Shaanxi Longmen Steel Company Hancheng715405ShaanxiChina

The bottom blowing element is the key equipment to ensure the bottom blowing effect of the *** types of bottom blowing elements,dispersive type(D1),double circular seam(D2)and straight cylinder type(D3),were built,and the effects of bottom blowing element type on molten bath flow,wall erosion and furnace bottom erosion were *** was found that when the bottom blowing elements of dispersive type(D1)and double circular seam(D2)were used,the dead zone area in the lower part of the molten bath was smaller,and the high-speed zone area was larger;therefore,the stirring effect on the bottom melt was *** the straight cylinder type(D3)bottom blowing element was used,the gas penetrated the molten bath at a faster rate to reach the surface of molten bath and failed to disperse in the bottom molten bath,and the wall shear stress near the nozzle outlet was *** argon was blown by three different bottom blowing elements,the area of the wall shear stress greater than 3 Pa was 4.8,5.6 and 8.7 cm2,respectively,within 0.2 m of the bottom blowing nozzle outlet.

关键词： Converter steelmaking Bottom blowing element Molten bath stirring Wall erosion

A deoxidation thermodynamic model for 304 stainless steel considering multiple-components coupled reactions

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Journal of Iron and Steel Research International 2024年第1期31卷 74-91页

作者： Yan Yan Guang-hao Shang Li-ping Zhang Shao-ying Li Han-jie Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing100083China Henan Jinhui Stainless Steel Industry Group Co. Ltd.Xuchang461500HenanChina Changge Jinhui Recycling Metal R&D Co. Ltd.Xuchang461500HenanChina

A thermodynamic model for predicting the equilibrium oxygens of 304 stainless steel was developed based on the theory of slag-steel equilibrium,the law of mass conservation,and the ion and molecule coexistence *** the developed model,the Fe-Cr-Mn-Si-Al-S-O-melts reaction system and CaO-MgO-CaF_(2)-FeO-MnO-Al_(2)O_(3)-SiO_(2)-Cr2O_(3)slags were *** oxygen contents calculated by the model are in good agreement with experimental results and reference *** equilibrium oxygen contents in 304 stainless steel mainly decrease with increasing binary basicity(w(CaO)/w(SiO_(2)),where w(i)is the mass percentage of component i)and decreasing *** binary basicity at 2.0 while maintaining temperatures lower than 1823 K will keep the oxygen contents in the 304 stainless steel lower than 15×10^(-6).The equilibrium oxygen contents may also be decreased with increasing content of MgO in slags,which is more significant at lower binary ***,a small amount of FeO,MnO,and Al_(2)O_(3)(about 0-2.5 wt.%)in slags has little effect on equilibrium oxygen ***,it is found that the[C]-[O]reaction may occur during refining process but will not significantly affect the equilibrium oxygen contents.

关键词： Complex deoxidation Thermodynamic model Ion and molecule coexistence theory 304 stainless steel Slag-steel reaction

Long-term efficacy and safety of Huangqi(Radix Astragali Mongolici)-based Traditional Chinese Medicine in diabetic peripheral neuropathy:a Meta-analysis of randomized controlled trials

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Journal of Traditional Chinese Medicine 2024年第2期44卷 229-242页

作者： ping Jing hao Hongzheng WU Zhenqi ZOU Meijuan LI Zuojing CHENG Gang School of Life Sciences and Biopharmaceutics Shenyang Pharmaceutical UniversityShenyang 110000China Department of Endocrinology Affiliated Hospital of Liaoning University of Traditional Chinese MedicineShenyang 110000China Department of Research Administration Affiliated Hospital of Liaoning University of Traditional Chinese MedicineShenyang 110000China School of Pharmacy Shenyang Pharmaceutical UniversityShenyang 110000China

OBJECTIVE:To assess the long-term effectiveness of Huangqi(Radix Astragali Mongolici,HQ)-based Traditional Chinese Medicine(TCM)in the treatment of diabetic peripheral neuropathy(DPN).METHODS:Nine databases were searched to retrieve available randomized controlled trials that compared HQbased TCM and Western Medicines in the treatment of *** methodological quality of the included studies was assessed using the Cochrane bias risk tool,and RevMan 5.4 was used for data *** effect estimates of interest were risk ratio(RR),mean difference(MD)or standardized mean difference(SMD)with 95%confidence interval(CI).RESULTS:The results from 48 available studies assessing 3759 patients demonstrated that cases administered HQ-based TCM[RR=1.30,95%CI(1.21,1.40),P<0.00001]or HQ-based TCM combined with Western Medicines[RR=1.25,95%CI(1.19,1.31),P<0.00001]exhibited higher total efficacy rates than individuals who received Western Medicine *** results showed that the HQ-based TCM group had decreased Toronto Clinical Scoring System scores[MD=-1.50,95%CI(-1.83,-1.17),P<0.00001],and reduced serum interleukin 6[SMD=-0.57,95%CI(-0.87,-0.27),P=0.0002]and tumor necrosis factors-αlevels[SMD=-0.60,95%CI(-0.95,-0.25),P=0.0009].In addition,both HQ-based TCM and HQbased TCM combined with Western Medicine increased nerve conduction velocity and decreased glycaemia compared with Western Medicine *** terms of blood lipids,oxidative stress and adverse drug reactions,there were no significant differences between the HQ-based TCM groups and the Western Medicine control ***:The current Meta-analysis revealed that HQ-based TCM yields higher efficacy and safety than Western Medicine alone for the treatment of DPN,although further well-designed RCTs are required to validate these findings.

关键词： Huangqi(Radix Astragali Mongolici) medicine Chinese traditional diabetic peripheral neuropathy Meta-analysis

Realizing high initial Coulombic efficiency in manganese-based layered oxide cathodes for sodium-ion batteries via P2/O'3 biphasic structure optimization

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Rare Metals 2024年第5期43卷 2093-2102页

作者： Bo Peng Zi-hao Zhou ping Xuan Jie Xu Lian-Bo Ma School of Materials Science and Engineering Anhui University ofTechnologyMa'anshan 243002China Anhui Product Quality Supervision&Inspection Research Institute Hefei 230051China

Mn-based layered oxides are among the most promising cathode materials for sodium-ion batteries owing to the advantages of abundance,environmenta friendliness,low cost and high specific capacity.P2 and O'3 are two representative structures of Mn-based layered ***,the P2 structure containing insufficien Na generally exhibits low initial charge capacity,while O'3structure with sufficient Na delivers high initial charge capacity but poor cycle *** study prepared a multitude of Na_(x)MnO_(2)(x=0.7,0.8,0.9)cathode materials with varying P2/O'3 ratios and further investigated their electrochemical *** optimized Na_(0.8)MnO_(2) comprising 69.9 wt%O'3 and 30.1 wt%P2 phase,exhibited relatively balanced specific capacity,Coulombic efficiency and cycle ***,it achieved a high specific capacity of 128.9 mAh·g^(-1) with an initia Coulombic efficiency of 98.2%in half-cell configuration The Na_(0.8)MnO_(2)//hard carbon full cell also achieved a high specific capacity of 126.7 mAh·g^(-1) with an initia Coulombic efficiency of 98.9%.Moreover,the capacity fading mechanism was revealed by combining in-situ and ex-situ X-ray *** findings of this study provide theoretical guidance for further modification design of Mnbased layered cathodes.

关键词： Sodium-ion batteries Cathode materials Mn-based layered oxides P2/0'3 composites

Biodegradable Poly(butylene adipate-co-terephthalate)/Poly(glycolic acid) Films: Effect of Poly(glycolic acid) Crystal on Mechanical and Barrier Properties

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Chinese Journal of Polymer Science 2023年第7期41卷 1123-1132页

作者： Hong-Wei Pan Ye Wang Shi-Ling Jia Yan Zhao Jun-Jia Bian Hui-Li Yang Yan-ping hao Li-Jing Han Hui-Liang Zhang Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun130022China School of Pharmaceutical Sciences Changchun University of Chinese MedicineChangchun130117China Changchun University of Technology Changchun130012China Shandong Dawn Polymer Co. Ltd.Longkou265700China

Binary biodegradable polymers films, poly(butylene adipate-co-terephthalate)(PBAT) and poly(glycolic acid)(PGA), were prepared through batch melt mixing to obtain Film Ⅰ and Film Ⅱ under two different processing conditions. PGA crystals played a major role in enhancing the mechanical and barrier properties of the films. For Film Ⅰ, there were initial PGA crystals before the film blowing process, the PGA molecular chain further crystallized, forming the oriented crystallization of PGA. Moreover, the Xcand crystalline size in Film Ⅰ were higher than those in Film Ⅱ. Compared with the different processing methods, Film Ⅰ has excellent mechanical and oxygen barrier properties due to the crystallization and orientation. The tensile strength reached 45.0 MPa, and tear strength exceeded 138.2 kN/m, while the elongation at break was as high as 750% for PBAT/PGA 85/15 in Film Ⅰ. The WVTR, WVP coefficients, and OP coefficients of PBAT/PGA films were decreased obviously with increasing the PGA content both in Film Ⅰ and Film Ⅱ. Moreover, the barrier properties of oxygen in Film Ⅰ were better than that in Film Ⅱ. This work reveals a feasible processing technique by introducing of initial crystallization of PGA to blow PBAT/PGA films with excellent mechanical and barrier properties.

关键词： Poly(butylene adipate-co-terephthalate) Poly(glycolic acid)(PGA) Biodegradable polymers Films

Strong-coupling superconductivity with Tc above 70 K in Be-decorated monolayer T-graphene

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 99-105页

作者： Liu Yang Peng-Fei Liu hao-Dong Liu Ya-ping Li Na Jiao Hong-Yan Lu Bao-Tian Wang ping Zhang School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Using first-principles calculations,we predict a new type of two-dimensional(2D)beryllium(Be)-decorated T-graphene named BeC_(2),where Be atoms are inserted into C–C bonds linking the carbon tetrarings of *** band structure shows that BeC_(2)is metallic,thus,the possible phonon-mediated superconductivity is explored based on the Eliashberg *** calculated electron-phonon coupling(EPC)constantλis up to 4.07,and the corresponding superconducting critical temperature(Tc)is 72.1 K,approaching the liquid nitrogen *** reason for the high Tc is the strong *** it is proved to be an anisotropic single-gap superconductor by analyzing the superconducting gap?kof BeC_(2).The electronic susceptibility calculation shows strong nesting effect in BeC_(2).Since rare 2D superconductors show such a strong EPC constantλwhich originates from the coupling between electrons in C-pzorbital and in-plane vibrations of Be and C atoms,the predicted BeC_(2)provides a new platform for investigating strong EPC 2D superconductor.

关键词： two-dimensional carbon-based superconductor electron-phonon coupling strong coupling high superconducting critical temperature

Confined nanospace pyrolysis: A versatile strategy to create hollow structured porous carbons

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Nano Research 2021年第9期14卷 3159-3173页

作者： Rui-ping Zhang Wen-Cui Li Guang-ping hao An-Hui Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China

Confined nanospace pyrolysis(CNP)has attracted increasing attention as a general strategy to prepare task-specific hollow structured porous carbons(HSPCs)in the past *** unique advantages of the CNP strategy include its outstanding ability in control of the monodispersity,porosity and internal cavity of *** a consequence,the obtained HSPCs perform exceptionally well in applications where a high dispersibility and tailored cavity are particularly required,such as drug delivery,energy storage,catalysis and so *** this review,the fundamentals of the CNP strategy and its advances in structural alternation is first summarized,then typical applications are discussed by exemplifying specific synthesis *** addition,this review offers insights into future developments for advanced task-specific hollow structured porous materials prepared by the CNP strategy.

关键词： confined nanospace pyrolysis hollow structures carbon materials core-shell structures dispersibility