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Decadal shifts in Qingzang Plateau lake carbon dynamics (1970-2020): From predominant carbon sources to emerging sinks

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Environmental Science and Ecotechnology 2024年第5期21卷 123-132页

作者： Di Shen Yu Li Yafeng wang Shouliang Huo Yong Liu Junjie Jia Shuoyue wang Kun Sun Yang Gao College of Earth and Environment Science Lanzhou UniversityLanzhou730000PR China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101PR China Chinese Research Academy of Environmental Sciences Beijing100012PR China College of Environmental Sciences and Engineering Peking UniversityBeijing1008714PR China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101PR China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049PR China

The evasion of carbon dioxide(CO_(2))from lakes significantly influences the global carbon *** global climatic transformations,the role of Qingzang Plateau(QZP)lakes as carbon(C)sources or sinks remains a subject of ***,accurately quantifying their contribution to the global carbon budget presents a formidable ***,spanning half a century(1970e2020),we utilize a synthesis of literature and empirical field data to assess the CO_(2) exchange flux of QZP *** find markedly higher CO_(2) exchange flux in the southeast lakes than that in the northern and western regions from 1970 to *** this time,both freshwater and saltwater lakes served primarily as carbon *** annual CO_(2) exchange flux was estimated at 2.04±0.37 Tg(Tg)C yr1,mainly influenced by temperature *** CO_(2) exchange flux patterns underwent a geographical inversion between 2000 and 2020,with increased levels in the west and decreased levels in the ***,CO_(2) emissions from freshwater lakes diminished,and certain saltwater lakes in the QTP transitioned from carbon sources to *** 2000 to 2020,the annual CO_(2) exchange flux from QZP lakes is estimated at 1.34±0.50 Tg C yr1,with solar radiation playing a more pronounced role in carbon ***,over the past five decades,QZP lakes have generally functioned as carbon ***,the total annual CO_(2) emissions have declined since the year 2000,indicating a potential shift trend from being a carbon source to a sink,mirroring broader patterns of global climate *** findings not only augment our understanding of the carbon cycle in plateau aquatic systems but also provide crucial data for refining China's carbon budget.

关键词： Carbon source Carbon sink Carbon exchange flux Qingzang Plateau Global climate change

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氧气体积分数对钒钛磁铁矿球团氧化过程的影响

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烧结球团 2024年第4期49卷 49-56页

作者：罗杰郑魁黄云林文康王炜武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室湖北武汉430081 武汉科技大学钢铁冶金新工艺湖北省重点实验室湖北武汉430081 攀钢集团研究院有限公司四川攀枝花617000 攀钢集团西昌钢钒有限公司四川西昌615000

提高高炉球团配比有利于降低钢铁行业的污染物和碳排放,为了使钒钛磁铁矿球团在高炉中得到更好的应用,本文研究了氧气体积分数对钒钛球团氧化速率的影响,利用动力学模型分析了其氧化反应的控速环节,分析了钒钛球团氧化过程物相组成、矿... 详细信息

提高高炉球团配比有利于降低钢铁行业的污染物和碳排放,为了使钒钛磁铁矿球团在高炉中得到更好的应用,本文研究了氧气体积分数对钒钛球团氧化速率的影响,利用动力学模型分析了其氧化反应的控速环节,分析了钒钛球团氧化过程物相组成、矿相结构等演变规律。结果表明:富氧能促进钒钛磁铁矿球团的氧化,钒钛磁铁矿球团的氧化过程符合未反应核模型,氧化过程前期以界面化学反应控速为主,后期以内扩散控速为主,内扩散阻力大于界面化学反应时的氧化度随着氧气体积分数的增加而降低。钒钛磁铁矿球团的氧化伴随着Fe_(3)O_(4)→Fe_(2)O_(3)、Fe_(2.75)Ti_(0.25)O_(4)→Fe_(2)TiO_(4)/FeTiO_(3)→Fe_(9)TiO_(15)的物相转变过程,在预热氧化过程会出现赤铁矿连晶,致使矿物间的孔隙率降低,氧气内扩散的阻力增大,氧化反应的速率降低。

关键词：氧气体积分数钒钛磁铁矿球团动力学矿物组成

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数字化转型视域下高校一体化服务构建研究

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内蒙古民族大学学报（自然科学版） 2024年第4期39卷 1-8页

作者：王磊刘行黑龙江大学数据科学与技术学院黑龙江哈尔滨150080

高等教育数字化转型是教育发展和变革的必然趋势,而当前的政策指引与转型进程尚未能同步是当下数字化转型的重点与难点。从发展进程、政策导向和内在需求的视角,分析智慧校园的转型进度、建设重点、实施计划等关键节点尚缺乏范式的原因... 详细信息

高等教育数字化转型是教育发展和变革的必然趋势,而当前的政策指引与转型进程尚未能同步是当下数字化转型的重点与难点。从发展进程、政策导向和内在需求的视角,分析智慧校园的转型进度、建设重点、实施计划等关键节点尚缺乏范式的原因,并依此提出系统性的设计理念和原则,构建包括基础设施、数据赋能、应用支撑、业务应用和融合门户的总体框架。通过实施混合云、数据中台和微服务平台等技术构建,聚焦于构建以数据为核心的高校一体化服务体系。

关键词：高等教育数字化转型一体化服务智慧校园微服务

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CircR-ZC3HC1 mediates MiR-384-5p/SIRT1 axis to promote neuronal autophagy and relieves ischemic stroke

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BIOCELL 2024年第3期48卷 491-499页

作者： MIN SHEN XIAOMAN XU GUANGLING SUN LIANGZHU wang TAO YING HANG SU WEI wang QINGHUA CAO ZHEZHE SUN Department of Neurology The First Affiliated Hospital of Ningbo UniversityNingbo315010China School of Medicine Ningbo UniversityNingbo315211China

Objective:Circular RNAs(circRNAs)have been shown to involve in pathological processes of ischemic stroke(IS),including *** study was designed to explore the effect of circR-ZC3HC1 on neuronal autophagy in IS and the related ***:Expression of circR-ZC3HC1 in blood samples of IS patients and healthy controls was *** neurons were treated with oxygen and glucose deprivation(OGD)to establish IS in vitro *** expression of LC3 and p62 and the number of autophagosomes were examined to evaluate the autophagy level of OGD induced neurons using western blotting and transmission electron *** apoptosis rate and the expression of cleaved caspase-3,Bax,and Bcl-2 were assessed byﬂow cytometry and western *** binding relationships among circR-ZC3HC1,miR-384-5p,and SIRT1 were predicted and veriﬁ***:Low expression of circR-ZC3HC1 was found in blood samples of IS patients and OGD-treated *** circR-ZC3HC1 or inhibited miR-384-5p expression promoted autophagy and inhibited apoptosis of OGD-treated neurons,which could be reversed by further 3-MA ***,circR-ZC3HC1 targeted miR-384-5p to mediate SIRT1 ***-384-5p overexpression or SIRT1 knockdown in the presence of circR-ZC3HC1 overexpression in OGD-treated neurons lead to reduced autophagy and enhanced ***:Collectively,circR-ZC3HC1 promoted neuronal autophagy to attenuate IS via miR-384-5p/SIRT1 axis.

关键词： Ischemic stroke circR-ZC3HC1 miR-384-5p SIRT1 Autophagy

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薄煤层N00工法巷道顶板控制机理及分区补偿支护技术

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Journal of Central South University 2024年第2期31卷 602-620页

作者：杨军刘奔王亚军张俊侯世林王育坤吴星李宏财 State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining&TechnologyBeijing 100083China School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Shenmu Ningtiaota Coal Mining Company Ltd. Shaanxi Coal Mining GroupYulin 719300China

薄煤层N00工法的提出,革新了传统的煤矿开采模式、关键技术与装备系统,并取得了成功应用。而新开采模式下的巷道围岩控制技术尚不完善,为实现薄煤层N00工法巷道顶板结构的安全稳定,考虑其工艺流程和顶板变形特点,将巷道划分为超前硐室... 详细信息

薄煤层N00工法的提出,革新了传统的煤矿开采模式、关键技术与装备系统,并取得了成功应用。而新开采模式下的巷道围岩控制技术尚不完善,为实现薄煤层N00工法巷道顶板结构的安全稳定,考虑其工艺流程和顶板变形特点,将巷道划分为超前硐室、垮落成巷两个阶段。并基于Hoek-Brown非线性岩体强度破坏准则,确定了巷道顶板不同阶段的锚杆/索预紧力的计算公式,提出了巷道顶板锚杆/索预紧力及长度设计方法。此外,结合数值模拟研究了不同阶段巷道顶板锚杆/索支护作用机理及不同锚杆/索支护组合对围岩应力分布的影响,揭示了锚杆/索支护关键参数对顶板稳定性的影响机制。最后,综合理论与数值模拟分析结果,提出了分区补偿支护技术,确定了锚杆/索预紧力、长度及选材的设计原则,该技术在现场取得了良好的应用效果。

关键词： N00工法沿空留巷上限法支护设计数值模拟

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Improved deep residual shrinkage network for a multi-cylinder heavy-duty engine fault detection with single channel surface vibration

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Energy and AI 2024年第2期16卷 277-288页

作者： Xiaolong Zhu Junhong Zhang Xinwei wang Hui wang Yedong Song Guobin Pei Xin Gou Linlong Deng Jiewei Lin State Key Laboratory of Engines Tianjin UniversityTianjin 300350China Tianjin Renai College Tianjin 301636China Weichai Power Co. Ltd.Weifang 261061China

The health monitoring and fault diagnosis of heavy-duty engines are increasingly important for energy storage ecosystem. During operation, vibration characters corresponding to the specific fault need to be extracted from the overall system vibration. Faulty characteristics emanating from one single cylinder are also mixed with those from other cylinders. Besides, the change of working condition brings strong nonlinearities in surface vibration. To solve these problems, an improved deep residual shrinkage network (IDRSN) is developed for detecting diverse engine faults at various degrees using single channel surface vibration signal. Within IDRSN, a wide convolution kernel is utilized in first convolution layer to capture the long-term fault-related impacts and eliminate the short-time random impact. The residual network module is adopted to enhance the focus the relevant components of vibration signals. Mini-batch training strategy is used to improve the model stability. Meanwhile, Gradient-weighted class activation map is adopted to assess the consistency between the learned knowledge and the fault-related information. The IDRSN is implemented to diagnosing a diesel engine under various faults, faulty degrees and operating speeds. Comparisons with existing models are analyzed in terms of hyper-parameters, training samples, noise resistance, and visualization. Results demonstrate the proposed IDRSN's superior performance on fault diagnosis accuracy, stability, anti-noise performance, and anti-interference performance. An average accuracy rate of 98.38 % was achieved by the proposed IDRSN, in comparison to 96.64 % and 93.56 % achieved by the DRSN and the wide-kernel deep convolutional neural network respectively. These results highlight the proposed IDRSN's superiority in diagnosing multiple faults under various working conditions, offering a low-cost, highly effective, and applicable approach for complex fault diagnosis tasks.

关键词： Improved deep residual shrinkage network Fault diagnosis Engine Vibration signal Multiple working conditions Deep learning

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负压排水法处理工程泥浆的室内模型试验

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长江科学院院报 2024年第9期41卷 114-122,129页

作者：储兆微余世杰李幸阳卢星宇王旭罗睿王天龙浙江大学海洋学院浙江舟山316021

现有传统处理工程泥浆的方法存在耗时、耗能、昂贵等缺点,而负压排水法具有绿色节能、施工简单、有效提高排水速率等特点。进行了负压排水法处理工程泥浆的室内模型试验研究,对其可行性进行讨论分析。通过使用自制试验箱和负压虹吸装置... 详细信息

现有传统处理工程泥浆的方法存在耗时、耗能、昂贵等缺点,而负压排水法具有绿色节能、施工简单、有效提高排水速率等特点。进行了负压排水法处理工程泥浆的室内模型试验研究,对其可行性进行讨论分析。通过使用自制试验箱和负压虹吸装置进行试验,并在虹吸管内连接测压表对装置负压实时监测。试验结果表明:在排水管内径为4 mm的前提下,负压排水能长期稳定进行;负压大小、排水效率都与排水高差呈正相关,且负压排水法处理小厚度泥浆效果较好,处理大厚度泥浆效果则会稍差。用该方法处理工程泥浆高效且免动力,可运用于实际。

关键词：工程泥浆处理负压排水法室内模型试验 4 mm管径

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超声弹性成像对浆细胞性乳腺炎的诊断价值分析

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内蒙古医学杂志 2024年第4期56卷 401-405,F0003页

作者：闫星王芳内蒙古科技大学包头医学院研究生院内蒙古包头014040 内蒙古自治区人民医院超声医学科呼和浩特010017

目的分析超声弹性成像在不同分型浆细胞性乳腺炎(PCM)中的成像特征。方法选择2020年12月至2022年10月在我院行常规超声检查和超声弹性成像检查的90例确诊为PCM的患者,依据超声声像图分型,分析各类型超声声像图、BI-RADS分类及弹性成像... 详细信息

目的分析超声弹性成像在不同分型浆细胞性乳腺炎(PCM)中的成像特征。方法选择2020年12月至2022年10月在我院行常规超声检查和超声弹性成像检查的90例确诊为PCM的患者,依据超声声像图分型,分析各类型超声声像图、BI-RADS分类及弹性成像评分。结果90例PCM患者中,导管扩张型18例(20.00%)、囊实混合型32例(35.56%)、实性肿块型40例(44.44%);常规超声判定Ⅳ类+Ⅴ类共有28例(31.11%),超声弹性评分4分+5分10例(11.11%),两者之间差异具有统计学意义(χ^(2)=7.000,P<0.05),超声弹性成像能够显著提高乳腺良性病变的检出率。结论不同分型的浆细胞性乳腺炎弹性成像特征不同,弹性成像在鉴别肿块型浆细胞性乳腺炎与浸润型导管癌中有一定价值。

关键词：超声弹性成像浆细胞性乳腺炎诊断

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Designing weakly and strongly solvating polymer electrolytes:Systematically boosting high-voltage lithium metal batteries

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SusMat 2024年第4期4卷 50-64页

作者： Tianyi wang Yimeng Zhang Xueyan Huang Peifeng Su Min Xiao Shuanjin wang Sheng Huang Dongmei Han Yuezhong Meng The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province State Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhouChina Department of Chemical Engineering Tsinghua UniversityBeijingChina School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhaiChina Institute of Chemistry Henan Provincial Academy of SciencesZhengzhouChina

Practical high-voltage lithium metal batteries hold promise for high energy density applications,but face stability challenges in electrolytes for both 4 V-class cathodes and lithium *** address this,we delve into the positive impacts of two crucial moieties in electrolyte chemistry:fluorine atom(-F)and cyano group(-CN)on the electrochemical performance of polyether electrolytes and lithium metal ***-bearing polyether electrolytes possess strong solvation,accelerating Li^(+)desolvation with minimal SEI *** polyether electrolytes possess weak solvation,and stabilize the lithium anode via preferential decomposition of F-segment,exhibiting nearly 6000-h stable cycling of lithium symmetric ***,the electron-withdrawing prop-erties of-F and-CN groups significantly bolster the high-voltage tolerance of copolymer electrolyte,extending its operational range up to 5 *** advance-ment enables the development of 4 V-class lithium metal batteries compatible with various cathodes,including 4.45 V LiCoO_(2),4.5 V LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),and 4.2 V LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2).These findings provide insights into design prin-ciples centered around polymer components for high-performance polymer electrolytes.

关键词： cyano-bearing copolymer electrolyte fluorinated copolymer electrolyte high-voltage lithium metal battery in situ polymerization solvation

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Circ_0053943 complexed with IGF2BP3 drives uveal melanoma progression via regulating N6-methyladenosine modification of Epidermal growth factor receptor

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Oncology Research 2024年第5期32卷 983-998页

作者： ANDI ZHAO YUE wang ZIJIN wang QING SHAO QI GONG HUI ZHU SHIYA SHEN HU LIU XUEJUAN CHEN Department of Ophthalmology The First Affiliated Hospital with Nanjing Medical UniversityNanjing210029China The First Clinical Medical College Nanjing Medical UniversityNanjing211166China Department of Ophthalmology Nanjing First HospitalNanjing Medical UniversityNanjing210006China

Numerous studies have characterized the critical role of circular RNAs(circRNAs)as regulatory factors in the progression of multiple ***,the biological functions of circRNAs and their underlying molecular mechanisms in the progression of uveal melanoma(UM)remain *** this study,we identified a novel circRNA,circ_0053943,through re-analysis of UM microarray data and quantitative ***_0053943 was found to be upregulated in UM and to promote the proliferation and metastatic ability of UM cells in both in vitro and in vivo ***,circ_0053943 was observed to bind to the KH1 and KH2 domains of insulin-like growth factor 2 mRNA-binding protein 3(IGF2BP3),thereby enhancing the function of IGF2BP3 by stabilizing its target *** sequencing assays identified epidermal growth factor receptor(EGFR)as a target gene of circ_0053943 and IGF2BP3 at the transcriptional *** assays demonstrated that circ_0053943 exerts its biological function by stabilizing EGFR mRNA and regulating the downstream mitogen-activated protein kinase/extracellular signal-regulated kinase(MAPK/ERK)signaling ***,circ_0053943 may promote UM progression by stabilizing EGFR mRNA and activating the MAPK/ERK signaling pathway through the formation of a circ_0053943/IGF2BP3/EGFR RNA-protein ternary complex,thus providing a potential biomarker and therapeutic target for UM.

关键词： Uveal melanoma Hsa_circ_0053943 IGF2BP3 EGFR MAPK/ERK signaling pathway

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