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Investigation of improving the thermophysical properties and corrosion resistance of RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates by component design with RE doping

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Journal of Advanced Ceramics 2024年第6期13卷 842-860页

作者： Zeyu Chen Yiling Huang Zhaoxuan Zhang wei Zheng Xuemei song Yaran Niu Yi zeng The State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Inorganic Coating Materials CAS Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

In this research,a novel method for regulating components in RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates was developed,combining the benefits of a suitable thermal expansion coefficient(CTE)and outstanding corrosion resistance against calcium–magnesium–alumino–silicate(CMAS).This approach enhanced the overall thermophysical ***,the results from the CMAS corrosion resistance test indicated that(Lu_(1/3)Yb_(1/3)Tm_(1/3))_(2)SiO_(5)/(Lu_(1/3)Yb_(1/3)Tm_(1/3))_(2)Si_(2)O_(7)and(Lu_(1/4)Yb_(1/4)Tm_(1/4)Er_(1/4))_(2)SiO_(5)/(Lu_(1/4)Yb_(1/4)Tm_(1/4)Er_(1/4))_(2)Si_(2)O_(7)exhibited exceptional resistance to CMAS penetration,even at temperatures up to 1500℃.To comprehend the corrosion mechanism of CMAS on these silicates,we introduced a reaction–diffusion model,which involved observing the changes in the interface between the corrosion product layer and the silicate *** was achieved using electron backscatter diffraction(EBSD).These findings lay a theoretical basis for selecting rare earth elements in RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates based on the radii of different rare earth cations.

关键词： thermal conductivity environmental barrier coatings(EBCs) thermal expansion coefficient(CTE) multiphase silicates calcium-magnesium-alumino-silicate(CMAS)corrosion resistance reaction-diffusion

An accurate and efficient space-time Galerkin spectral method for the subdiffusion equation

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Science China Mathematics 2024年第10期67卷 2387-2408页

作者： wei zeng Chuanju Xu School of Mathematical Sciences and Fujian Provincial Key Laboratory of Mathematical Modeling and High Performance Scientific Computing Xiamen University

In this paper, we design and analyze a space-time spectral method for the subdiffusion ***, we are facing two difficulties. The first is that the solutions of this equation are usually singular near the initial time. Consequently, traditional high-order numerical methods in time are inefficient. The second obstacle is that the resulting system of the space-time spectral approach is usually large and time-consuming to solve. We aim at overcoming the first difficulty by proposing a novel approach in time, which is based on variable transformation techniques. Suitable ψ-fractional Sobolev spaces and a new variational framework are introduced to establish the well-posedness of the associated variational problem. This allows us to construct our space-time spectral method using a combination of temporal generalized Jacobi polynomials(GJPs) and spatial Legendre polynomials. For the second difficulty, we propose a fast algorithm to effectively solve the resulting linear system. The fast algorithm makes use of a matrix diagonalization in space and QZ decomposition in time. Our analysis and numerical experiments show that the proposed method is exponentially convergent with respect to the polynomial degrees in both space and time directions, even though the exact solution has very limited regularity.

关键词： subdiffusion equations variable transformation $\psi$-Sobolev spaces well-posedness space-time Galerkin spectral method error estimate fast algorithm

A newly proposed heatstroke-induced coagulopathy score in patients with heat illness: A multicenter retrospective study in China

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Chinese Journal of Traumatology 2024年第2期27卷 83-90页

作者： Qing-wei Lin Lin-Cui Zhong Long-Ping He Qing-Bo zeng wei Zhang Qing song Jing-Chun song Department of Critical Care Medicine The 908th Hospital of Chinese PLA Logistic Support ForcesNanchang360104Jiangsu ProvinceChina Department of Emergency Medicine The 900th Hospital of Chinese PLA Logistic Support ForcesFuzhou350000China Department of Critical Care Medicine Hainan Hospital of Chinese PLA General HospitalSanya572013Hainan ProvinceChina

Purpose:In patients with heatstroke, disseminated intravascular coagulation (DIC) is associated with greater risk of in-hospital mortality. However, time-consuming assays or a complex diagnostic system may delay immediate treatment. Therefore, the present study proposes a new heatstroke-induced coagulopathy (HIC) score in patients with heat illness as an early warning indicator for ***:This retrospective study enrolled patients with heat illness in 24 Chinese hospitals from March 2021 to May 2022. Patients under 18 years old, with a congenital clotting disorder or liver disease, or using anticoagulants were excluded. Data were collected on demographic characteristics, routine blood tests, conventional coagulation assays and biochemical indexes. The risk factors related to coagulation function in heatstroke were identified by regression analysis, and used to construct a scoring system for HIC. The data of patients who met the diagnostic criteria for HIC and International Society on Thrombosis and Haemostasis defined-DIC were analyzed. All statistical analyses were performed using SPSS ***:The final analysis included 302 patients with heat illness, of whom 131 (43.4%) suffered from heatstroke, including 7 death (5.3%). Core temperature (OR = 1.681, 95% CI 1.291 - 2.189, p < 0.001), prothrombin time (OR = 1.427, 95% CI 1.175 - 1.733, p < 0.001) and D-dimer (OR = 1.242, 95% CI 1.049 - 1.471, p = 0.012) were independent risk factors for heatstroke, and therefore used to construct an HIC scoring system because of their close relation with abnormal coagulation. A total score ≥ 3 indicated HIC, and HIC scores correlated with the score for International Society of Thrombosis and Hemostasis-DIC (r = 0.8848, p < 0.001). The incidence of HIC (27.5%) was higher than that of DIC (11.2%) in all of 131 heatstroke patients. Meanwhile, the mortality rate of HIC (19.4%) was lower than that of DIC (46.7%). When HIC developed into DIC, parameters of coagulation dysfunct

关键词： Heat illness Heatstroke Coagulation disorders Diagnosis Disseminated intravascular coagulation

Manipulating the Flipping of Water Dipoles in Carbon Nanotubes

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Chinese Physics Letters 2019年第10期36卷 17-21页

作者： Dang-Xin Mao Xiao-Gang Wang Guo-Quan Zhou song-wei zeng Liang Chen Jun-Lang Chen Chao-Qing Dai Department of Optical Engineering Zhejiang A&F UniversityHangzhou 311300 School of Information and Industry Zhejiang A&F UniversityHangzhou 311300

Flipping of water dipoles in carbon nanotubes is of great importance in many physical and biological applications,such as signal amplification,molecular switches and *** of these applications,understanding and inhibiting the non-negligible thermal noise is ***,we use molecular dynamics simulations to show that the flipping frequency of water dipoles increases with the rising temperature,and the thermal noise can be suppressed by imposed charges and external uniform electric ***,the water dipoles flip periodically between two equiprobable and stable states under alternating electric *** two stable states may be adopted to store 0 and 1 bits for memory storage or molecular computing.

关键词： noise negligible Carbon

Exploring the Effect of Plasticity on the Phase Imaging of TM-AFM Through Molecular Dynamics Simulations

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Acta Mechanica Solida Sinica 2024年第2期37卷 297-304页

作者： Guolin Liu Yu zeng Yaxin Chen Zheng wei School of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijing100029China

In the tapping-mode atomic force microscope(TM-AFM),the probe tip continuously taps the sample surface,which may cause plastic deformation of the sample and result in energy *** energy dissipation of the probe is closely related to the scanned phase *** quantify the energy dissipation due to plastic indentations of the sample,this study utilized a combination of molecular dynamics(MD)simulations and experiments on single-crystal copper samples,including multiple nano-indentation *** energy dissipation of the probe due to the plastic deformation of the sample was calculated by integrating the hysteresis curve of the indentation depth versus the force applied to the *** simulation results are in good agreement with the experimental *** sets of results have demonstrated that the plastic energy dissipation decreases as the number of indentations increases,and eventually the energy of the probe tends to *** equilibrium energy dissipation is associated with other dissipation ***,it was observed that,after hundreds of taps,the dissipated energy of plastic deformation could be ignored,implying that the scanned image may not reflect the plasticity information of the sample after multiple taps of the probe on the sample surface for scanning.

关键词： Atomic force microscopy Force-distance curves Nano-indentations Plasticity Molecular dynamics

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制度公正与人性制约

南京师大学报（社会科学版） 2005年第5期 25-29,43页

作者：宋增伟河南师范大学政治与管理科学学院河南新乡453007

制度公正指社会在进行制度设计、制度选择、制度实施、制度创新和制度评价过程中要遵循社会公正原则。制度公正是符合人性要求的产物,同时设定并付诸实施的制度又会反作用于人性。一种制度公正与否自然不能脱离人性的考虑,制度公正的人... 详细信息

制度公正指社会在进行制度设计、制度选择、制度实施、制度创新和制度评价过程中要遵循社会公正原则。制度公正是符合人性要求的产物,同时设定并付诸实施的制度又会反作用于人性。一种制度公正与否自然不能脱离人性的考虑,制度公正的人性制约因素主要表现在以下几方面:1.正确的人性假设是制度公正的前提;2.制度公正必须符合人性实际的要求;3.人性的局限性决定了制度公正的相对性;4.制度公正的实现还受到人性发展水平的制约。制度公正的基本功能就是抑恶扬善,协调私利与社会公益的矛盾,塑造全面发展的人的个性。

关键词：制度公正制度设计人性制约人性假设社会公正原则制度实施评价过程制度创新制约因素人性发展

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尊重个人利益是衡量制度设计是否科学的关键

南京师大学报（社会科学版） 2006年第5期 31-36页

作者：宋增伟河南师范大学政治与公共管理学院河南新乡453007

曼德维尔在《蜜蜂的寓言》中提出了“私人恶德即公共利益”的思想,他通过寓言得出结论:国家的繁荣和人民的普遍幸福,只有顺应人的利己本性才能得到实现。因此,在进行制度设计时必须充分认识和评价个人利益的积极作用。就公私两种行为而... 详细信息

曼德维尔在《蜜蜂的寓言》中提出了“私人恶德即公共利益”的思想,他通过寓言得出结论:国家的繁荣和人民的普遍幸福,只有顺应人的利己本性才能得到实现。因此,在进行制度设计时必须充分认识和评价个人利益的积极作用。就公私两种行为而言,制度是针对人的利己主义行为的,尊重个人利益是衡量制度设计是否科学的关键。制度的主要功能是调动人的积极性,而要做到这些就必须解决“个人利益”与“公共利益”之间的关系,即如何能够使人人像关心个人利益一样关心公共利益,这就是私利公益问题。制度设计的目标是实现私利公益,而只有建立在尊重个人利益基础上的制度设计才能实现社会公益的目标。

关键词：制度设计个人利益公共利益

Multi-UAVs Collaborative Path Planning in the Cramped Environment

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 529-538页

作者： Siyuan Feng Linzhi zeng Jining Liu Yi Yang Wenjie song School of Automation Beijing Institute of TechnologyNanjing 210039China Nanjing Research Institute of Electronics Technology Nanjing 210039China Yichang Testing Technique Research Institute Yichang 443003China IEEE

Due to its flexibility and complementarity, the multiUAVs system is well adapted to complex and cramped workspaces, with great application potential in the search and rescue(SAR) and indoor goods delivery fields. However, safe and effective path planning of multiple unmanned aerial vehicles(UAVs)in the cramped environment is always challenging: conflicts with each other are frequent because of high-density flight paths, collision probability increases because of space constraints, and the search space increases significantly, including time scale, 3D scale and model scale. Thus, this paper proposes a hierarchical collaborative planning framework with a conflict avoidance module at the high level and a path generation module at the low level. The enhanced conflict-base search(ECBS) in our framework is improved to handle the conflicts in the global path planning and avoid the occurrence of local deadlock. And both the collision and kinematic models of UAVs are considered to improve path smoothness and flight safety. Moreover, we specifically designed and published the cramped environment test set containing various unique obstacles to evaluating our framework performance thoroughly. Experiments are carried out relying on Rviz, with multiple flight missions: random, opposite, and staggered, which showed that the proposed method can generate smooth cooperative paths without conflict for at least 60 UAVs in a few *** benchmark and source code are released in https://***/inin-xingtian/multi-UAVs-path-planner.

关键词： Collision avoidance conflict resolution multi-unmanned aerial vehicles(UAVs)system path planning

Radical involved reactive wetting and retarding mechanism of alumina refractory ceramic by molten slags under weak static magnetic field

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Journal of Iron and Steel Research International 2024年第6期31卷 1355-1366页

作者： Sheng-hao Li Ao Huang Fan-bo zeng Hui Peng Hao-ran wei Xue-chun Huang Sheng-qiang song Hua-zhi Gu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

High alumina slag will cause severe corrosion at the interface of alumina refractory,and the wetting behavior of slag is a key factor influencing the corrosion resistance of refractory *** static magnetic field is a promising solution for improvement in the slag resistance of *** wetting of alumina refractory ceramics with different basicities of high alumina slags under a weak static magnetic field was analyzed,given that a weak static magnetic field can affect the corrosion behavior of refractory *** slag S_(3) as an example,when there was an external static magnetic field of 1.0 mT at 1600 ℃,the thickness of calcium aluminate reaction layer at the interface decreased by 36.7%,the denting depth of interface decreased by 35.6%,and the apparent wetting angle increased by 20%.The living radicals and their formation path in oxide melts were verified by first-principles calculation combined with electron paramagnetic resonance spectroscopy *** influence of the flux density of a weak static magnetic field on the wetting behavior of slags was also *** contact angle of the slags increased owing to the inhibitory effect of magnetic field on the radicalinvolved reaction at the interface of the slag and the alumina refractory *** relationships between the magnetic flux density,diffusion coefficient,slag microstructure(hyperfine coupling constant),and contact angle were *** provides a theoretical basis for the field control of radical involved reactive wetting between inorganic oxide slags and solid oxide ceramics.

关键词： Alumina refractory ceramic Molten slag Weak magnetic field effect Reactive wetting Free radical