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Molecular composition of low-temperature oxidation products of the heavy oil

Petroleum Science 2023年第5期20卷 3264-3271页

作者： Shuai Ma Yun-Yun Li ri-gu su Xu-Sheng Wang Jing-Jun Pan Quan Shi guang-Zhi Liao Chun-Ming Xu State Key Laboratory of Heavy Oil Processing Petroleum Molecular Engineering Center(PMEC)China University of PetroleumBeijing102249China Engineering Technology Research Institute of PetroChina Xinjiang Oilfield Company Karamay834000XinjiangChina CAS Lanzhou Institute of Chemical Physics Lanzhou730000GansuChina PetroChina Exploration&Production Company Beijing100007China

Low-temperature oxidation(LTO)is the main reaction that affects fuel formation in the in-situ combustion process,which has important significance for the subsequent combustion propulsion and the successful extraction of crude *** this study,heavy oil was subjected to LTO reactions at different *** types of reaction products with varying oxidation depths were characterized in terms of the number of oxygen atoms and the polarity of the molecule to reveal the low-temperature oxidation process of the heavy *** compounds and acid polyoxides in the oil phase and deep oxidation products with a higher number of oxygen atoms in the coke were identified with increasing oxidation *** experimental results showed that the oxidation reaction of the heavy oil changed from kinetic-controlled to diffusion-controlled in the open oxidation system of the heavy oil as the oxidation depth *** oxidation reaction of the oil phase reached a maximum and stable value in oxygen *** molecular compositions of the ketone compound and acid polyoxide did not change significantly with further increase in reaction *** molecular compositions of the deep oxidation products with a higher number of oxygen atoms in the coke phase changed *** coke precursor molecules with a lower oxygen content and condensation degree participated in the coke formation,and the oxidation reaction pathway and the complexity of the oxidation product component also increased.

关键词： Low-temperature oxidation In-situ combustion Heavy oil Coke precursor Molecular composition

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Recombinant chitinase-3-like protein 1 alleviates learning and memory impairments via M2 microglia polarization in postoperative cognitive dysfunction mice

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Neural Regeneration Research 2025年第9期20卷 2727-2736页

作者： Yujia Liu Xue Han Yan su Yiming Zhou Minhui Xu Jiyan Xu Zhengliang Ma Xiaoping gu Tianjiao Xia Department of Anesthesiology Nanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjingJiangsu ProvinceChina Medical School Nanjing UniversityNanjingJiangsu ProvinceChina Jiangsu Key Laboratory of Molecular Medicine Nanjing UniversityNanjingJiangsu ProvinceChina State Key Laboratory of Pharmaceutical Biotechnology Nanjing UniversityNanjingJiangsu ProvinceChina Department of Anesthesiology Zhongshan HospitalFudan UniversityShanghaiChina

Postoperative cognitive dysfunction is a seve re complication of the central nervous system that occurs after anesthesia and surgery,and has received attention for its high incidence and effect on the quality of life of *** date,there are no viable treatment options for postoperative cognitive *** identification of postoperative cognitive dysfunction hub genes could provide new research directions and therapeutic targets for future *** identify the signaling mechanisms contributing to postoperative cognitive dysfunction,we first conducted Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses of the Gene Expression Omnibus GSE95426 dataset,which consists of mRNAs and long non-coding RNAs differentially expressed in mouse hippocampus3 days after tibial *** dataset was enriched in genes associated with the biological process"regulation of immune cells,"of which Chill was identified as a hub ***,we investigated the contribution of chitinase-3-like protein 1 protein expression changes to postoperative cognitive dysfunction in the mouse model of tibial fractu re *** were intraperitoneally injected with vehicle or recombinant chitinase-3-like protein 124 hours post-surgery,and the injection groups were compared with untreated control mice for learning and memory capacities using the Y-maze and fear conditioning *** addition,protein expression levels of proinflammatory factors(interleukin-1βand inducible nitric oxide synthase),M2-type macrophage markers(CD206 and arginase-1),and cognition-related proteins(brain-derived neurotropic factor and phosphorylated NMDA receptor subunit NR2B)were measured in hippocampus by western *** with recombinant chitinase-3-like protein 1 prevented surgery-induced cognitive impairment,downregulated interleukin-1βand nducible nitric oxide synthase expression,and upregulated CD206,arginase-1,pNR2B,and brain-derived neurotropic factor expr

关键词： Chil1 hippocampus learning and memory M2 microglia neuroinflammation postoperative cognitive dysfunction(POCD) recombinant CHI3L1

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Bluish-green emission of novel BaAl_(2)Ge_(2)O_(8):Eu^(2+) phosphors under near-ultraviolet excitation

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Journal of Rare Earths 2025年第1期43卷 30-38,I0002页

作者： Sk.Khaja Hussain Jae su Yu Department of Electronic Engineering Institute for Wearable Convergence ElectronicsKyung Hee University1 Seocheon-dongGiheung-guYongin-sGyeonggi-do446-701Republic of Korea Nanosensor Research Institute Hanyang University55 Hanyangdaehak-roSangnok-guAnsanGyeonggi-do15588Republic of Korea

A new class of phosphor samples,denoted as Ba_(1-x)Al_(2)Ge_(2)O_(8):xEu^(2+)(BAGO:xEu^(2+))was synthesized using a Pechini-type sol-gel technique and subsequent thermal reduction in CO *** morphology and structural characteristics of both the BAGO host lattice and the Eu^(2+)ions activated BAGO phosphors were investigated through field-emission scanning electron microscopy and X-ray diffractometry analyses,*** BAGO host lattice has micro-sized particles and the rietveld refinement reveals the presence of a monoclinic crystal phase,characterized by the space group I2/c(No.15).Introducing Eu^(2+)ions into Ba^(2+)sites under CO condition reduces the particle size,switching from microscale to *** the near-ultraviolet spectrum(353 nm),the BAGO:xEu^(2+)phosphors exhibit a broadband bluish-green photoluminescence(PL)emission characterized by a peak band at 492 *** phenomenon is attributed to the 4f^(6)5d^(1)→4f^(7) electronic *** BAGO:0.02Eu^(2+)phosphor shows the strongest bluish-green PL emission,and a co mprehensive description of the concentration quenching mechanism between Eu^(2+)ions is ***,the thermal stability of the optimized BAGO:0.02Eu^(2+)phosphor was investigated,and its activation energy was ***,the synthesized bluish-green BAGO:0.02Eu^(2+)phosphor holds the promise of being a novel and potential candidate for utilization in white light-emitting diode applications.

关键词： Broadband bluish-green Ba1Al_(2)Ge_(2)O_(8):Eu^(2+) Near-ultraviolet excitation cothermal reduction White light-emitting diodes Rare earths

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Application of a multicomponent exercise and cognitive stimulation program in elderly patients with mental disorders and sarcopenia

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Chinese Journal of Nursing 2025年第3期60.0卷 266-273页

作者： Jin, Xiaochao Shi, Zhongying Zhou, Yingfeng Huang, Xiaoyan Huang, Chuxian gu, Yanhong su, Ya Li, Li 上海交通大学医学院附属精神卫生中心普通精神科上海市200025 上海交通大学医学院附属精神卫生中心护理部上海市200025 复旦大学护理学院上海交通大学护理学院

Objective To explore the effect of a multicomponent exercise and cognitive stimulation program in elderly patients with mental disorders and sarcopenia, so as to provide references for reducing the risk of falls, preventing and improving sarcopenia, and enhancing cognitive function in patients. Methods The multi-component exercise and cognitive stimulation program was formulated through literature review and expert meeting. In this quasi-experimental study, 76 elderly patients with mental disorders and sarcopenia who were hospitalized in a tertiary mental health center in Shanghai from January 2023 to February 2024 were selected as research subjects. They were randomly divided into an experimental group and a control group according to their hospitalization building number (38 cases in each group). The experimental group was treated with multicomponent exercise combined with cognitive stimulation program based on routine nursing, and the control group was treated with routine nursing. The risk of falls, skeletal muscle mass, muscle strength, physical function, cognitive function, and incidence of adverse events were compared between 2 groups after 12 weeks of intervention. Results A total of 75 patients with 37 in the control group and 38 in the experimental group completed the study. The TUG time, 6M walking speed and the score of Short Physical Performance Bettery of the experimental group were all lower than those of the control group (Primental group were all higher than those of the control group (Prienced any adverse events. Conclusion The application of this multicomponent exercise combined cognitive stimulation program developed for elderly patients with mental disorders and sarcopenia can effectively reduce the risk of falls, enhance the skeletal muscle mass and muscle strength and improve the cog

关键词： Aged Cognitive Stimulation Falls Mental Disorders Multicomponent Exercise Nursing Care Sarcopenia

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GenAI技术在教育评价中的算法偏见:表现、成因与对策

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现代教育技术 2025年第1期35卷 53-62页

作者：谢琦余日季蔡苏湖北大学艺术与设计学院湖北武汉430062 北京师范大学教育学部北京100875

在全球创新驱动发展战略不断深化的背景下,生成式人工智能(Generative AI,GenAI)技术正逐步成为推动教育评价体系转型升级的重要力量。然而,当前教育领域对智能技术的应用仍处于初级阶段,尤其在大语言模型的可解释性方面面临严峻挑战。... 详细信息

在全球创新驱动发展战略不断深化的背景下,生成式人工智能(Generative AI,GenAI)技术正逐步成为推动教育评价体系转型升级的重要力量。然而,当前教育领域对智能技术的应用仍处于初级阶段,尤其在大语言模型的可解释性方面面临严峻挑战。数据偏差、算法设计缺陷和测试验证不足导致的“算法偏见”问题,已成为制约技术公平应用的关键难题。对此,文章结合GenAI技术在教育评价中的实际应用,首先系统梳理了算法偏见的具体表现,涵盖个体差异、地域差异、社会地位差异等维度;之后深入剖析了偏见产生的成因,主要从数据质量、模型设计、应用场景三个方面展开;最后提出完善算法设计、统筹治理主体、促进技术普惠等对策,以期为构建公正、透明、包容的教育评价体系提供参考。

关键词： GenAI技术算法偏见教育评价数据伦理人工智能

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面向LBE流动换热的SST k-ω-k_(θ)-ε_(θ)四参数模型构建与验证

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核动力工程 2025年第1期46卷 100-106页

作者：吴杰苏兴康蔡杰进巩子琦顾龙华南理工大学电力学院广州510640 兰州大学核科学与技术学院兰州730000

为解决极低普朗特数流体的数值传热计算问题,提高液态铅铋合金(LBE)流动换热数值计算精度,在OpenFOAM框架下,构建了雷诺应力和湍流热通量的SST k-ω-k_(θ)-ε_(θ)四参数模型。使用四参数模型在垂直管内和带绕丝格架19棒束LBE流动换热... 详细信息

为解决极低普朗特数流体的数值传热计算问题,提高液态铅铋合金(LBE)流动换热数值计算精度,在OpenFOAM框架下,构建了雷诺应力和湍流热通量的SST k-ω-k_(θ)-ε_(θ)四参数模型。使用四参数模型在垂直管内和带绕丝格架19棒束LBE流动换热基准实验的基础上,结合相应的努塞尔数与摩擦因子经验关联式,进行了与湍流普朗特数(Pr_t)模型的对比验证和传热分析。结果表明,SST k-ω-k_(θ)-ε_(θ)四参数模型所预测的温度与实验数据吻合较好,对传热的预测性能优于Pr_t模型,适用于LBE流动换热数值计算。

关键词：四参数模型 OpenFOAM 铅铋合金(LBE) 流动换热

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Latest research progress for LBE coolant reactor of China initiative accelerator driven system project

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Frontiers in Energy 2021年第4期15卷 810-831页

作者： Long gu Xingkang su Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China

China’s accelerator driven subcritical system(ADS)development has made significant progress during the past *** the successful construction and operation of the international prototype of ADS superconducting proton linac,the lead-based critical/subcritical zero-power facility VENUS-II and the comprehensive thermal-hydraulic and material test facilities for LBE(lead bismuth eutectic)coolant,China is playing a pivotal role in advanced steady-state operations toward the next step,the ADS *** China initiative Accelerator Driven System(CiADS)is the next facility for China’s ADS program,aimed to bridge the gaps between the ADS experiment and the LBE cooled subcritical *** total power of the CiADS will reach 10 *** CiADS engineering design was approved by Chinese government in *** then,the CiADS project has been fully transferred to the construction application *** subcritical reactor is an important part of the whole CiADS ***,a pool-type LBE cooled fast reactor is chosen as the subcritical reactor of the *** and thermal experiments and software development for LBE coolant were conducted simultaneously to support the design and construction of the CiADS LBEcooled subcritical ***,it is necessary to introduce the efforts made in China in the LBE-cooled fast reactor to provide certain supporting data and reference solutions for further design and development for ***,the roadmap of China’s ADS,the development process of the CiADS,the important design of the current CiADS subcritical reactor,and the efforts to build the LBE-cooled fast reactor are presented.

关键词： LBE(lead bismuth eutectic)coolant reactor China initiative Accelerator Driven System(CiADS)project research progress

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RGS22 maintains the physiological function of ependymal cells to prevent hydrocephalus

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Science China(Life Sciences) 2025年第2期68卷 441-453页

作者： Xue Pang Lin gu Qiu-Ying Han Jia-Qing Xing Ming Zhao Shao-Yi Huang Jun-Xi Yi Jie Pan Hao Hong Wen Xue Xue-Qing Zhou Zhi-Hui su Xin-Ran Zhang Li-Ming sun Shao-Zhen Jiang Dan Luo Ling Chen Zheng-Jie Wang Yu Yu Tian Xia Xue-Min Zhang Ai-Ling Li Tao Zhou Hong Cai Tao Li Nanhu Laboratory National Center of Biomedical AnalysisBeijing 100039China School of Basic Medical Sciences Fudan UniversityShanghai 200032China Department of Basic Medical Sciences School of MedicineTsinghua UniversityBeijing 100084China

Ependymal cells line the wall of cerebral ventricles and ensure the unidirectional cerebrospinal fluid(CSF)flow by beating their motile cilia *** ependymal denudation or ciliary dysfunction causes ***,we report that the deficiency of regulator of Gprotein signaling 22(RGS22)results in severe congenital hydrocephalus in both mice and ***,RGS22 is specifically expressed in ependymal cells within the *** conditional knock-out mice,we further demonstrate that the deletion of Rgs22 exclusively in nervous system is sufficient to induce ***,we show that Rgs22 deficiency leads to the ependymal denudation and impaired *** phenomenon can be attributed to the excessive activation of lysophosphatidic acid receptor(LPAR)signaling under Rgs22^(-/-)condition,as the LPAR blockade effectively alleviates hydrocephalus in Rgs22^(-/-)***,our findings unveil a previously unrecognized role of RGS22 in the central nervous system,and present RGS22 as a potential diagnostic and therapeutic target for hydrocephalus.

关键词： RGS22 hydrocephalus ependymal cells

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基于不同目标函数的WRF-Hydro模型参数敏感性研究

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中国农村水利水电 2025年第1期 61-69页

作者：谷黄河石怀轩孙敏涛丁震顾苏烨河海大学水灾害防御全国重点实验室江苏南京210098 河海大学水文水资源学院江苏南京210098

水文与气象预报相结合可以有效提高洪水预报的精度和延长预见期,陆气耦合模型已成为水文气象学者研究的重点。WRF-Hydro模型作为新一代分布式陆气耦合模型在多尺度洪水预报中具有广阔的应用前景,但由于各物理过程参数化方案复杂,模型计... 详细信息

水文与气象预报相结合可以有效提高洪水预报的精度和延长预见期,陆气耦合模型已成为水文气象学者研究的重点。WRF-Hydro模型作为新一代分布式陆气耦合模型在多尺度洪水预报中具有广阔的应用前景,但由于各物理过程参数化方案复杂,模型计算量大,对该模型的参数敏感性研究还不充分,也影响着模型的模拟精度。研究以湿润区的新安江上游屯溪流域为研究对象,构建多个单目标和多目标函数,并结合Morris全局参数敏感性分析方法,探究了WRF-Hydro模型在不同目标函数下的参数敏感性。结果表明:土壤参数(DKSAT、SMCMAX、BEXP)主要影响壤中流和地表径流,对径流量影响显著,尤其DKSAT最为敏感,直接影响水在土壤中的下渗速度,增大时基流量显著增高而洪峰流量则明显降低;产流参数(SLOPE、REFKDT)主要影响地表径流和基流分配,对洪水过程线形状有重要影响;河道汇流参数ManN影响汇流速度并主要控制峰现时间;植被参数MP对于总水量有一定影响;坡面汇流参数OVROUGHRTFAC和地下水参数Zmax则最不敏感。不同目标函数下的参数敏感性顺序和最优参数取值有一定差异,单目标函数中以相对误差为优化目标会更侧重于全年径流总量和低流量部分的模拟精度,而以效率系数和Kling-gupta系数为目标则更侧重于场次洪水和高流量部分的模拟效果;基于几个单目标函数组合的多目标函数综合考虑了不同目标函数的影响,结果在一定程度上优于单目标函数。研究可为合理确定WRF-Hydro模型参数优化策略提供参考。

关键词： WRF-Hydro模型 Morris法敏感性分析多目标函数洪水预报

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基于ISGMD-RPT的滚动轴承故障诊断方法

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振动.测试与诊断 2025年第1期45卷 95-102,202,203页

作者：李可彭雄宿磊顾杰斐薛志钢江苏省食品先进制造装备技术重点实验室无锡 214122 江南大学机械工程学院无锡 214122 江苏省特种设备安全检验监督研究院无锡分院无锡 214071

针对传统辛几何模态分解(symplectic geometry mode decomposition,简称SGMD)方法因嵌入维数选择依靠经验公式,导致出现信号模态混叠和过度分解的问题,提出了一种改进的辛几何模态分解(improved symplectic geometry mode decomposition... 详细信息

针对传统辛几何模态分解(symplectic geometry mode decomposition,简称SGMD)方法因嵌入维数选择依靠经验公式,导致出现信号模态混叠和过度分解的问题,提出了一种改进的辛几何模态分解(improved symplectic geometry mode decomposition,简称ISGMD)方法。首先,通过计算原始信号的功率谱密度得到最大主峰的频率并设定嵌入维数区间,根据峭度准则筛选分解后的辛几何分量(symplectic geometry component,简称SGC),得到每个嵌入维数对应的最优SGC;其次,引入模态混叠指数、过分解指数与峭度指标的综合评估目标值函数,选择最优嵌入维数;然后,利用拉马努金周期变换(ramanujan periodic transform,简称RPT)方法进行微弱故障特征增强;最后,通过仿真信号及风机滚动轴承实验数据,并与经验模态分解和局部均值分解等方法进行对比,验证了所提出滚动轴承故障诊断方法的有效性。

关键词：改进的辛几何模态分解拉马努金周期变换滚动轴承故障诊断

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