检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Yang, Wenrui Huang, Yuewen Tang, Zhiyi Xiong, Xiaolong Li, Chengwei Zhong, xuwen Liu, Liai Zhou, Hai zhang, Xun School of Civil and Architectural Engineering East China University of Technology Nanchang330012 China

The development of the modernization process has resulted in the consumption of natural resources and the accumulation of construction waste, and the environmental bearing capacity faces severe challenges to a certain extent. The recovery and reuse of concrete is one of the effective ways to alleviate the environmental load. However, pouring concrete with recycled aggregate inevitably reduces the strength of the building. More seriously, the coastal tidal environment can have a coupled effect of salt erosion and dry-wet cycles on concrete components, thereby shortening the service life of concrete. The incorporation of fibers can improve the performance of the Recycled Aggregate Concrete (RAC) under special conditions. This article analyzes the changes in the performance of concrete specimens under different Basalt Fiber (BF) volume ratios (0%, 0.5%, 1.0%, and 1.5%) and composite salt simulated accelerated erosion cycles (0 d, 30 d, 60, and 90 d). The comparison results of RAC in apparent corrosion morphology, internal microstructure, and impermeability test show that BF can inhibit the expansion of microcracks and micropores in the test block and improve the overall compactness of the internal structure of RAC. When the fiber content of BF is 1.0%, the toughening effect of concrete is optimal, and impermeability and corrosion resistance of RAC are also significantly improved. Furthermore, the corrosion damage mechanism of Basalt Fiber Recycled Aggregate Concrete (BFRAC) under the combined effects of composite salts and dry-wet cycles was comprehensively summarized and substantiated through chemical reaction principles. The paper proposed a salt solution erosion model of BFRAC, which elucidates the mechanism of fiber crack resistance and explains the accelerated corrosion mechanism of salt solution from the perspective of "ion crack channels." The proposed model provides theoretical support for the salt erosion damage of fiber-reinforced concrete. © 2023, The Author

关键词： Erosion

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Janus粒子增强PP/PMMA共混聚合物材料的力学和热稳定性能的研究

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材料导报 2025年第9期39卷 242-249页

作者：张龙姚旭文车春霞秦智李国洲韩迎红杨博兰州理工大学材料科学与工程学院兰州730050 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州730050 中国石油石油化工研究院兰州化工研究中心兰州730060

聚丙烯(PP)/聚甲基丙烯酸甲酯(PMMA)复合材料具有良好的力学性能和耐热性,但PP与PMMA相容性较差,导致材料力学性能和热稳定性受限。本工作采用乳液聚合法制备了尺寸约118 nm的聚苯乙烯共聚甲基丙烯酸甲酯/聚苯乙烯(P(St-co-MMA)/PS)Janu... 详细信息

聚丙烯(PP)/聚甲基丙烯酸甲酯(PMMA)复合材料具有良好的力学性能和耐热性,但PP与PMMA相容性较差,导致材料力学性能和热稳定性受限。本工作采用乳液聚合法制备了尺寸约118 nm的聚苯乙烯共聚甲基丙烯酸甲酯/聚苯乙烯(P(St-co-MMA)/PS)Janus不对称乳胶纳米粒子(P(St-co-MMA)Janus NPs),将其以不同比例添加到PP/10%PMMA和PP/30%PMMA体系中,经熔融共混、注塑成型技术得到PP/PMMA/P-(St-co-MMA)Janus NPs复合材料,并进行了相关表征分析。结果表明,引入的P(St-co-MMA)Janus NPs分散在PP/PMMA复合材料中的两相界面处,其可显著改善复合材料的力学性能和热稳定性能。PP/10%PMMA/0.9%P(St-co-MMA)Janus NPs相比PP/10%PMMA,冲击强度和拉伸强度分别提高15.53%和14.03%;PP/30%PMMA/0.9%P(St-co-MMA)Janus NPs相比PP/30%PMMA,冲击强度和拉伸强度分别提高37.09%和32.35%,且热失重5%和50%对应的温度(T_(5)和T_(50))分别升高39.51%和33.37%。P(St-co-MMA)Janus纳米粒子对PP/PMMA复合材料的增强作用归因于其能够阻碍相分离、增强界面结合等。

关键词： Janus纳米粒子聚合物共混增容剂相界面

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FETAL MOVEMENT SIGNAL DETECTION METHOD BASED ON MULTIPLE PRESSURE SENSORS

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JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY 2021年第5期21卷 2140024-2140024页

作者： Liu, Jianli Li, xuwen zhang, Song zhang, Qiang Yang, Lin Yang, Yimin Hao, Dongmei Beijing Univ Technol Fac Environm & Life Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100024 Peoples R China

Objective: Fetal movement (FM) is one of the objective phenomena of fetal life. The decrease of FM is a clinical indicator of fetal hypoxia. A fetal motion detection method is based on multiple pressure sensors and multi features. Methods: Collecting the abdominal data of pregnant women using multi-pressure sensors, preprocessing the signal with a digital filter, extracting the time-frequency characteristics of FM signal. The designed classifier is used for recognition of the extracted features. Results: The detection system used for FM time series can provide reliable results with a detection rate of 93.0% and a positive rate is 75.9%. Conclusion: The portable detection system proposed in this paper is a good alternative that will optimize medical use, professionals and hospital resources and has potential application prospects in the field of home electronic medical treatment.

关键词： Fetal movement detection pressure sensor classifier

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Geographic differences in pharmacotherapy patterns and outcomes of acute ischemic stroke in China

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BMC NEUROLOGY 2024年第1期24卷 64页

作者： Li, Ying Ou, Qianhua Lu, Yuxuan Shen, Zhiyuan Li, Jieyu zhang, Zhuangzhuang Tai, Liwen Li, Guozhong Chen, Huisheng zhang, Guiru zhang, Lei Sun, xuwen Qiu, Jinhua Wei, Yan Zhu, Sainan Wang, Zhaoxia Sun, Weiping Huang, Yining Peking Univ First Hosp Dept Neurol 8 Xishiku St Beijing 100034 Peoples R China Beijing Key Lab Neurovasc Dis Discovery Beijing Peoples R China Techpool Biopharm Co Ltd Dept Med Affairs Guangzhou Peoples R China Hebei Med Univ Hosp 2 Dept Neurol Shijiazhuang Peoples R China Harbin Med Univ Affiliated Hosp 1 Dept Neurol Harbin Peoples R China Gen Hosp Shenyang Mil Command Dept Neurol Shenyang Peoples R China Penglai Peoples Hosp Dept Neurol Penglai Peoples R China Sun Yat Sen Univ Affiliated Hosp 5 Dept Neurol Zhuhai Peoples R China Qindao Univ Affiliated Yantai Yuhuangding Hosp Med Coll Dept Neurol Yantai Peoples R China Huizhou First Hosp Dept Neurol Huizhou Peoples R China Harrison Int Peace Hosp Dept Neurol Hengshui Peoples R China Peking Univ First Hosp Dept Biostat Beijing Peoples R China

Background: Vast economic and healthcare status discrepancies exist among regions in China, contributing to different treatment patterns. This study was aimed to investigate the current status of pharmacotherapy for acute ischemic stroke (AIS) and outcomes in China and explore the geographic variation in stroke care. Methods: This study was a multicenter prospective registry study, which collected the data of patients with AIS from 80 hospitals in 46 cities in 2015-2017 across China. Poor functional outcome defined as a modified Rankin Scale score of 3-6 was assessed at 3 and 12 months. Multivariate logistic regression was used. Results: Among 9973 eligible patients, the number of receiving intravenous thrombolysis (IVT), antiplatelet agents, anticoagulants, statin and human urinary kallidinogenase was 429 (4.3%), 9363 (93.9%), 1063 (10.7%), 6828 (74.7%) and 5112 (51.2%), respectively. Multivariable analysis showed IVT use in northeastern was significantly more frequent than in eastern region (OR = 3.17, 95% CI, 2.53-3.99), while the antiplatelets agents use were less frequent (OR = 0.46, 95%CI: 0.38-0.57). The proportions of poor outcomes at 3 and 12 months were 20.7% and 15.8%, respectively. Multivariate analysis showed AIS patients from northeastern and central region had significantly lower risk of poor outcome at month 3 and 12 than those from eastern region (all P < 0.05). Conclusions: There was a low IVT use and a high antiplatelet agent and statin use for AIS in China. The pharmacotherapy and prognosis of AIS had variation by geographic region.

关键词： Acute ischemic stroke Geographic variation Outcome Pharmacotherapy

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Advanced treatment of phosphorus-containing tail water by Fe-Mg-Zr layered double hydroxide beads: Performance and mechanism

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JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021年 296卷 113203-113203页

作者： zhang, Yangzhong Qin, Jiafu Wang, Xiaojun Chen, Zhenguo Zheng, xuwen Chen, Yongxing South China Univ Technol Sch Environm & Energy Guangzhou 510006 Peoples R China South China Univ Technol Sch Chem & Chem Engn Guangzhou 510006 Peoples R China

The adsorption process for low concentration phosphorus wastewater treatment has advantages of simple convenience, stable performance and less sludge, while most of current adsorbents fail to be separated for reuse. Meanwhile, few people pay attention to the removal of low concentration phosphorus from tail water by adsorbents. In this study, a newly efficient Fe-Mg-Zr layered double hydroxide beads were prepared by simple insitu crosslinking method and applied for low concentration phosphorus adsorption from real tail water. The maximum adsorption capacity of Fe-Mg-Zr beads was 21.61 mg/g, showing more practical application value for phosphorus removal. Fixed bed experiments showed that 5.0 g adsorbent could removed 2.12 mg phosphorus from tail wastewater containing 1.03 mg/L phosphorus. The beads adsorbent can be reused with excellent adsorption performance even after five cycles of adsorption-desorption operation. After detailed analyses, it was found that ligand exchange and ion exchange were the dominant mechanisms for phosphorus adsorption by this beads. Overall, the material has the advantages of simple preparation, good adsorption performance, easy separation and recycle, indicating a great potential for low concentration phosphorus wastewater treatment.

关键词： Fe-Mg-Zr beads Adsorption Phosphorus-containing tail water Recycling

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Establishment of a personalized fetal growth curve model

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TECHNOLOGY AND HEALTH CARE 2021年第1_suppl期29卷 S311-S317页

作者： Bao, Xinyu Wang, Yan zhang, Song Yang, Lin Liu, Guoli Yang, Yimin Li, xuwen Hao, Dongmei Chen, Aiqing Liu, Xiaohong Shao, Jing Beijing Univ Technol Fac Environm & Life Sci Beijing 100124 Peoples R China Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100124 Peoples R China Peking Univ Peoples Hosp Beijing 100044 Peoples R China Beijing Yes Med Devices Co Ltd Beijing 100152 Peoples R China

BACKGROUND: Fetal weight is one of the important indicators for judging whether fetal growth and development are normal. Fetal weight exceeding the normal range may lead to poor delivery outcomes. OBJECTIVE: We aimed to establish a personalized fetal growth curve in order to effectively monitor fetal growth during pregnancy. Fetal weight can be monitored while fetal growth and development are assessed. METHODS: This study retrospectively analyzed the birth weight and ultrasound database of 3,093 newborns delivered at normal term. The personalized fetal growth curve model was generated based on the birth weight formula established by Gardosi combined with the proportional weight equation. RESULTS: (1) The average birth weight of the single fetus at normal term was 3,457g. (2) According to the regression results of the proportion of fetal weight in full-term pregnancy and gestational week, the proportional weight equation is Weight% = 500.9 + 51.60GA + 1.727GA(2) 0.01718GA(3) (GA is gestational week), R-2 is 98%, P < 0.001. CONCLUSIONS: In this study, the normal birth weight of newborns and normal range of fetal weight can be estimated by using the personalized fetal growth curve model.

关键词： Fetal weight fetal growth curve birth weight proportional weight equation normal range

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基于多传感器融合技术的智能助行器用户运动意图估计算法

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信息与控制 2024年第6期53卷 689-700页

作者：张一勤王亚刚姚旭文何佳桥周康寿孟巧玲喻洪流上海理工大学光电信息与计算机工程学院上海200093 上海康复器械工程技术研究中心上海200093 上海理工大学康复工程与技术研究所上海200093 民政部神经功能信息与康复工程重点实验室上海200093

智能助行器作为重要的辅助工具,在帮助行动不便的个体维持独立性和减轻日常活动困难方面发挥着广泛的应用。其中,用户运动意图估计是使用者准确控制助行器的关键。本文针对下肢行动不便的人群设计了一款智能助行器,该助行器通过3维力传... 详细信息

智能助行器作为重要的辅助工具,在帮助行动不便的个体维持独立性和减轻日常活动困难方面发挥着广泛的应用。其中,用户运动意图估计是使用者准确控制助行器的关键。本文针对下肢行动不便的人群设计了一款智能助行器,该助行器通过3维力传感器和2维激光雷达采集用户行走状态信息。在用户运动意图估计算法中,原有的线速度估计方法容易受到里程计误差的干扰,为此,提出了一种基于用户腿部相对位置的用户意图线速度估计方法。同时,为解决仅依赖3维力传感器难以准确估计下肢行动不便人群的意图角速度的问题,引入了基于多传感器融合技术的角速度估计方法。同时考虑到算法处理数据造成的滞后,本文将Informer模型融入算法中,克服了人机实时交互的困难。研究结果表明,所提的线速度估计方法准确度达到98.44%,而角速度估计算法准确度达到了96.6%。通过肌电信号反映,用户能够更轻松地使用本文设计的助行器,而Informer模型进一步提升了用户使用助行器的便捷性。一系列实验验证了所提方法的有效性。

关键词：智能助行器人体运动意图估计多传感器融合 Informer

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微生物燃料电池工作原理及产电性能提升策略

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环境工程技术学报 2024年第2期14卷 699-709页

作者：蒋进元张月何绪文谭伟宋浩洋石冬妮赵洪兵中国环境科学研究院环境污染控制工程技术研究中心中国矿业大学(北京)化学与环境工程学院四川省广元生态环境监测中心站

微生物燃料电池(MFC)是一种解决其他能源在环境方面不足的新技术,目前低能量输出是MFC实际应用的关键瓶颈。基于MFC工作原理,提出微生物活性差、电子迁移阻力、质子传输阻力及阴极还原反应缓慢是MFC能量输出的限制因素,并从以下5个方面... 详细信息

微生物燃料电池(MFC)是一种解决其他能源在环境方面不足的新技术,目前低能量输出是MFC实际应用的关键瓶颈。基于MFC工作原理,提出微生物活性差、电子迁移阻力、质子传输阻力及阴极还原反应缓慢是MFC能量输出的限制因素,并从以下5个方面综述了提升MFC产电性能策略:调节pH和选择最佳盐度,加强微生物代谢活性;改性阳极材料,降低电子迁移阻力;增强电解液电导率、优化隔膜材料及缩短电极间距减小质子传输阻力;制备高效阴极催化剂和选择优异电子受体加快阴极还原反应速率;改进MFC反应器构型,提高整体产电性能。未来,可在合成新型阴极催化剂、降低膜污染、优化微生物生长环境、制备优异的电极材料和改进MFC反应器配置5个方面开展重点研究。

关键词：微生物燃料电池(MFC) 产电性能输出功率微生物活性策略

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CLINICAL AND TRANSLATIONAL MEDICINE 2024年第3期14卷 e1613页

作者： Lin, xuwen Xie, Mei Yao, Jie Ma, Xidong Qin, Lin zhang, Xu-Mei Song, Jialin Bao, Xinyu zhang, Xin zhang, Yinguang Liu, Yiming Han, Wenya Liang, Yiran Jing, Ying Xue, Xinying Capital Med Univ Beijing Shijitan Hosp Emergency & Crit Care Med Ctr Dept Resp & Crit Care Beijing Peoples R China Chinese Peoples Liberat Army Gen Hosp Dept Resp & Crit Care Beijing Peoples R China Capital Med Univ Beijing Chest Hosp TB & Thorac Tumor Inst Dept Endoscop Diag & Treatment Beijing Peoples R China Weifang Med Univ Dept Pathol Affiliated Hosp Weifang Shandong Peoples R China Weifang Med Coll Dept Resp & Crit Care Weifang Shandong Peoples R China Capital Med Univ Beijing Tiantan Hosp Dept Thorac Surg Beijing Peoples R China Chinese Peoples Liberat Army Gen Hosp Dept Thorac Surg Beijing Peoples R China Hubei Univ Med Taihe Hosp Dept Resp & Crit Care Shiyan Peoples R China Fudan Univ Ctr Intelligent Med Greater Bay Area Inst Precis Med Guangzhou Sch Life Sci Guangzhou Guangdong Peoples R China Fudan Univ Greater Bay Area Inst Precis Med Guangzhou Ctr Intelligent Med Sch Life Sci Guangzhou 511462 Guangdong Peoples R China Capital Med Univ Beijing Shijitan Hosp Emergency & Crit Care Med Ctr Dept Resp & Crit Care Beijing 100038 Peoples R China

The emergence of immune checkpoint inhibitors (ICIs) has heralded a transformative era in the therapeutic landscape of non-small cell lung cancer (NSCLC). While ICIs have demonstrated clinical efficacy in a portion of patients with NSCLC, these treatments concurrently precipitate a spectrum of immune-related adverse events (irAEs), encompassing mild to severe manifestations, collectively posing a risk of significant organ damage. Consequently, there exists an imperative to augment our comprehension of the pathophysiological underpinnings of irAEs and to formulate more efficacious preventive and ameliorative strategies. In this comprehensive review, we delineate the clinical presentation of organ-specific irAEs in patients with NSCLC and provide an in-depth analysis of recent advancements in understanding the mechanisms driving ICI-induced toxicity. Furthermore, we discuss potential strategies and targets for ameliorating these irAEs. Ultimately, this review aims to furnish valuable insights to guide further research endeavours in the context of irAEs in NSCLC patients. Immunotherapy not only revolutionises lung cancer treatment but also poses serious toxicity risks. Elucidating irAE mechanisms in NSCLC: T/B-cell dysregulation, cytokine imbalances, autoantibody production, genetic predispositions and gut microbiome alterations. Highlighting precise irAE interventions in NSCLC: corticosteroids, targeted immunosuppressants, monoclonal antibodies targeting lymphocytes, cytokine inhibitors and signalling pathway modulators. image

关键词： immune checkpoint inhibitors immune-related adverse events mechanism non-small cell lung cancer

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高精度惯性测试转台结构设计与模态分析

中国科技论文在线精品论文

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中国科技论文在线精品论文 2024年第4期17卷 496-500页

作者：张欣梅许文杨阳杨扬南昌航空大学科技学院江西九江332020

以高精密惯性测试转台为目标对象,根据该产品的技术指标要求,确定了转台结构类型,详细介绍了转台台体结构设计流程,完成转台结构设计。对转台进行仿真模态分析,并通过生产具体样机,对其进行轴系精度指标检测,所得结果优于产品技术指标,... 详细信息

以高精密惯性测试转台为目标对象,根据该产品的技术指标要求,确定了转台结构类型,详细介绍了转台台体结构设计流程,完成转台结构设计。对转台进行仿真模态分析,并通过生产具体样机,对其进行轴系精度指标检测,所得结果优于产品技术指标,符合设计要求,证明了该结构设计方法安全可靠,对同类型产品结构设计具有参考借鉴意义。

关键词：航空器结构与设计航空宇航制造工程高精度惯性测试设备结构设计模态分析

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