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On the extra edge-connectivity of hypercubes 被引量:1
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作者 ZHANG Ming-zu MENG Ji-xiang YANG Wei-hua 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2016年第2期198-204,共7页
The classical hypercube structure is a popular topological architecture in parallel computing environments and a large number of variations based on the hypercube were posed in the past three decades. Reliability eval... The classical hypercube structure is a popular topological architecture in parallel computing environments and a large number of variations based on the hypercube were posed in the past three decades. Reliability evaluation of systems is important to the design and maintenance of multiprocessor systems. The h-extra edge-connectivity of graph G(V, E) is a kind of measure for the reliability of interconnection systems, which is defined as the minimum cardinality of a subset of edge set, if any, whose deletion disconnects G and such that every re- maining component has at least h vertices. This paper shows that the h-extra edge-connectivity 2n-1 2n-1 of the hypercube Qn is a constant 2n-1 for 2n-1/3≤ h2n-1, and n ≥ 4, which extends the result of [Bounding the size of the subgraph induced by m vertices and extra edge-connectivity of hypercubes, Discrete Applied Mathematics, 2013, 161(16): 2753-2757]. 展开更多
关键词 Edge fault tolerance extra edge-connectivity HYPERCUBE
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Multipoint Deformation Prediction Model Based on Clustering Partition of Extra High-Arch Dams
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作者 Bin Ou Haoquan Chi +3 位作者 Xu’an Qian Shuyan Fu Zhirui Miao Dingzhu Zhao 《Computer Modeling in Engineering & Sciences》 2026年第1期546-576,共31页
Deformation prediction for extra-high arch dams is highly important for ensuring their safe operation.To address the challenges of complex monitoring data,the uneven spatial distribution of deformation,and the constru... Deformation prediction for extra-high arch dams is highly important for ensuring their safe operation.To address the challenges of complex monitoring data,the uneven spatial distribution of deformation,and the construction and optimization of a prediction model for deformation prediction,a multipoint ultrahigh arch dam deformation prediction model,namely,the CEEMDAN-KPCA-GSWOA-KELM,which is based on a clustering partition,is pro-posed.First,the monitoring data are preprocessed via variational mode decomposition(VMD)and wavelet denoising(WT),which effectively filters out noise and improves the signal-to-noise ratio of the data,providing high-quality input data for subsequent prediction models.Second,scientific cluster partitioning is performed via the K-means++algorithm to precisely capture the spatial distribution characteristics of extra-high arch dams and ensure the consistency of deformation trends at measurement points within each partition.Finally,CEEMDAN is used to separate monitoring data,predict and analyze each component,combine the KPCA(Kernel Principal Component Analysis)and the KELM(Kernel Extreme Learning Machine)optimized by the GSWOA(Global Search Whale Optimization Algorithm),integrate the predictions of each component via reconstruction methods,and precisely predict the overall trend of ultrahigh arch dam deformation.An extra high arch dam project is taken as an example and validated via a comparative analysis of multiple models.The results show that the multipoint deformation prediction model in this paper can combine data from different measurement points,achieve a comprehensive,precise prediction of the deformation situation of extra high arch dams,and provide strong technical support for safe operation. 展开更多
关键词 extra high arch dams deformation prediction data noise reduction spatial distribution clustering partition
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基于Extra Trees模型的咪唑类离子液体植物毒性预测及SHAP值分析
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作者 茹雨璇 曹雨希西 +2 位作者 胡肖肖 邵云海 马琳 《宝鸡文理学院学报(自然科学版)》 2025年第3期17-22,44,共7页
目的构建一种高效可行的机器学习模型用于咪唑类离子液体对植物的毒性预测,为绿色、低毒性离子液体的开发提供理论支持和新思路。方法收集200余个咪唑类离子液体对植物的毒性实验数据集,基于SMILES字符串提取分子描述符,构建了一个Extra... 目的构建一种高效可行的机器学习模型用于咪唑类离子液体对植物的毒性预测,为绿色、低毒性离子液体的开发提供理论支持和新思路。方法收集200余个咪唑类离子液体对植物的毒性实验数据集,基于SMILES字符串提取分子描述符,构建了一个Extra Trees预测模型。模型的性能通过决定系数(R^(2))、均方根误差(RMSE)等指标进行评估,并采用SHapley Additive exPlanations(SHAP)值分析预测结果,以量化特征值对毒性预测的贡献程度。结果Extra Trees模型在测试集上显示出良好的预测性能(R^(2)=0.944,RMSE=0.351)。SHAP分析揭示了分子中非极性基团、支链/环状结构、分子量等物理化学性质及分子结构对植物毒性的影响。结论构建的Extra Trees模型能够快速准确地预测咪唑离子液体的植物毒性,具有较好的泛化能力和鲁棒性,可为环境风险评估及绿色离子液体的设计开发提供科学依据。 展开更多
关键词 咪唑离子液体 机器学习 extra Trees模型 植物毒性
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Evaluating serum extra spindle pole bodies-like 1 protein vs p53 antibody for hepatitis B virus-related hepatocellular carcinoma diagnosis
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作者 Yan-Fei Feng Hui-Kun Zhou +8 位作者 Bo-Bin Hu Hang Wang Heng-Kai Liang Lu Wei Qing-Mei Li Tu-Mei Su Qian-Bing Yin Ming-Hua Su Jian-Ning Jiang 《World Journal of Hepatology》 2025年第7期221-232,共12页
BACKGROUND Hepatitis B virus(HBV)infection is a leading cause of global hepatocellular carcinoma(HCC).Conventional biomarkers such as alpha-fetoprotein(AFP)demonstrate suboptimal sensitivity and specificity.Emerging e... BACKGROUND Hepatitis B virus(HBV)infection is a leading cause of global hepatocellular carcinoma(HCC).Conventional biomarkers such as alpha-fetoprotein(AFP)demonstrate suboptimal sensitivity and specificity.Emerging evidence suggests that serum extra spindle pole bodies like 1(ESPL1)protein and p53 antibody may improve diagnostic accuracy.AIM To assess and compare the diagnostic performance of serum ESPL1 protein and p53 antibody in HBV-related HCC(HBV-HCC).METHODS This case-control study from the First Affiliated Hospital of Guangxi Medical University enrolled 30 patients with chronic hepatitis B(CHB),30 with HBV-related liver cirrhosis(HBV-LC),55 with HBV-HCC,and 30 healthy controls.Serum ESPL1 protein and p53 antibody levels were quantified via ELISA.Diagnostic performance was evaluated using receiver operating characteristic(ROC)curve analysis,including sensitivity,specificity,and correlation with AFP.RESULTS Serum ESPL1 protein levels progressively increased across disease stages(CHB:89.9 ng/L;HBV-LC:188.83 ng/L;HBV-HCC:317.63 ng/L),with a significantly higher area under the ROC curve(AUC=0.917)than either p53 antibody(AUC=0.725)or AFP(AUC=0.678).p53 antibody levels were significantly elevated only in the HBVHCC group.ESPL1 demonstrated superior sensitivity and concordance with histopathological findings.A significant correlation between ESPL1 and p53 antibody levels was observed exclusively in the HBV-HCC group(r=0.320,P=0.017),suggesting potential interplay in malignant transformation.CONCLUSION Serum ESPL1 protein,a promising biomarker for early HBV-HCC detection,outperforms p53 antibody in diagnostic reliability.Higher ESPL1 levels correlate with increased HCC risk in chronic HBV patients. 展开更多
关键词 extra spindle pole bodies-like 1 p53 antibody Hepatocellular carcinoma Hepatitis B virus Diagnostic biomarker Case-control study
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Interplay between intestinal permeability and metabolic dysfunctionassociated steatotic liver disease:Could there be a role for extra virgin olive oil consumption?
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作者 Lydia Giannitrapani Marinella Ferraro +2 位作者 Aurelio Seidita Anna Licata Maurizio Soresi 《World Journal of Hepatology》 2025年第12期8-23,共16页
Metabolic dysfunction-associated steatotic liver disease is a multifaceted disease associated with obesity,insulin resistance(IR),type 2 diabetes mellitus-in a word,metabolic syndrome-which has been extensively studie... Metabolic dysfunction-associated steatotic liver disease is a multifaceted disease associated with obesity,insulin resistance(IR),type 2 diabetes mellitus-in a word,metabolic syndrome-which has been extensively studied because it is related to an alteration of the normal metabolism of glucose and lipids,ultimately leading to triglyceride accumulation within hepatocytes.This lipid overload triggers an inflammatory status,also influenced by gut-liver axis dysfunction,with gut dysbiosis,which alters intestinal permeability,causing inflammation and IR in a vicious circle.Several approaches have been attempted to treat this condition and stop its poss-ible evolution towards increasingly serious stages,but the first step is always lifestyle modification.The Mediterranean diet seems to be the most reliable for affecting liver steatosis,probably thanks to extra virgin olive oil,a healthy food with a high content of monounsaturated fatty acids and variable concentrations of phenols(oleocanthal)and phenolic alcohols,such as hydroxytyrosol and tyrosol.This review investigates the mechanisms underlying the bidirectional and synergistic relationships among metabolic dysfunction-associated steatotic liver disease,IR,and the gut-liver axis,specifically focusing on the role of extra virgin olive oil as one of the main antioxidant components of the Mediterranean diet. 展开更多
关键词 Metabolic dysfunction-associated steatotic liver disease Metabolic syndrome Intestinal permeability Gut-liver axis extra virgin olive oil
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Accelerated discovery of stable and extra-large-pore nano zeolites: A paradigm shift in catalytic materials
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作者 Basem E.Keshta Lingyao Wang Yuanbin Zhang 《Chinese Journal of Structural Chemistry》 2025年第12期1-2,共2页
Zeolites are crystalline microporous materials widely used in catalysis,adsorption,and ion exchange owing to their tunable pore structures and acid centers[1].Traditional zeolites,however,often suffer from limitations... Zeolites are crystalline microporous materials widely used in catalysis,adsorption,and ion exchange owing to their tunable pore structures and acid centers[1].Traditional zeolites,however,often suffer from limitations such as restricted molecular diffusion and rapid coking,which hinder their efficiency in processing large molecules. 展开更多
关键词 accelerated discovery ion exchange extra large pore zeolites molecular diffusion pore structures stable nano zeolites processing large molecules crystalline microporous materials
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噪声与健康:如何与声音共存
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作者 马蕙 王超 +2 位作者 舒珊 陈凯 苏婳 《科技导报》 北大核心 2026年第4期17-26,共10页
正确认识和准确评估噪声对健康的危害,是制定合理的噪声政策、学会在噪声中生存的关键。系统介绍了噪声对健康的影响路径;明确了特定人群和特定空间场所下的噪声健康影响,探讨了声景在提升居住者健康水平中的应用潜力。噪声不仅会引起... 正确认识和准确评估噪声对健康的危害,是制定合理的噪声政策、学会在噪声中生存的关键。系统介绍了噪声对健康的影响路径;明确了特定人群和特定空间场所下的噪声健康影响,探讨了声景在提升居住者健康水平中的应用潜力。噪声不仅会引起听力损失、耳鸣、心血管疾病、睡眠障碍等生理影响,还会引起烦恼感和认知障碍等问题。特定人群在面对噪声暴露时会表现出更高的健康风险易感性,儿童、老年人和噪声敏感性人群是噪声健康影响的易感人群。相对其他空间场景,在城市公共空间与住宅空间中尤其要关注噪声的健康危害。此外,积极声景能够促进心理生理恢复并缓解认知疲劳,除噪声控制以外,声景干预也有望成为提升城市声环境品质的有效方法。 展开更多
关键词 噪声与健康 特大空间 特殊群体 声景
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中国企业应对非传统涉外法律风险的道与术 被引量:1
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作者 霍政欣 《中国应用法学》 2026年第1期53-69,共17页
美国对华政策转向战略遏制导致我国外部环境严峻复杂,中国企业由此面临一系列非传统涉外法律风险,主要包括投资领域国家安全泛化、进出口管制升级、多点触发单边制裁、涉外合规冲突加剧等。面对非传统涉外法律风险不断加大,我国须加快... 美国对华政策转向战略遏制导致我国外部环境严峻复杂,中国企业由此面临一系列非传统涉外法律风险,主要包括投资领域国家安全泛化、进出口管制升级、多点触发单边制裁、涉外合规冲突加剧等。面对非传统涉外法律风险不断加大,我国须加快涉外领域立法,研究制定《海外利益保护法》《国际紧急状况应对法》,构建威慑有力和打击精准的阻断及反制外国对我国非法行使域外管辖权的法律制度,健全国际商事调解、仲裁、诉讼等机制;要加强国际法的运用,综合运用双边、区域及全球经济治理机制等手段推进国际法治建设。从企业层面看,要增强涉外合规意识,健全涉外合规体系,建立重点领域风险预警机制,加强涉外缔约能力,敢于和善于运用东道国法、国际法和我国涉外法律规则维护权益,全面增强“走出去”的法治应对能力。 展开更多
关键词 非传统法律风险 海外利益 涉外法治 域外管辖
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特高含硫气田智慧化应急防控系统构建与应用——以TSP气田为例
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作者 李杰 王荣德 +6 位作者 于林 赖文华 任艳辉 王舟洋 和钰凯 王桥 孙超 《天然气技术与经济》 2026年第1期37-43,共7页
特高含硫气田开发安全风险极高,现有应急管理模式有可能存在信息孤岛、响应滞后、协同低效等瓶颈。为此,以四川盆地硫化氢含量最高达251 g/m3的TSP气田为对象,构建了一套数据驱动、流程再造的智慧化应急防控系统。该系统融合实时生产数... 特高含硫气田开发安全风险极高,现有应急管理模式有可能存在信息孤岛、响应滞后、协同低效等瓶颈。为此,以四川盆地硫化氢含量最高达251 g/m3的TSP气田为对象,构建了一套数据驱动、流程再造的智慧化应急防控系统。该系统融合实时生产数据、高精度空间数据、气象及视频数据,基于GIS平台进行多源信息融合与空间分析,建立了“感知-研判-指挥-复盘”的全流程闭环管理体系。研究结果表明:(1)该系统实现了应急响应的标准化与智能化,将事件接警与初步研判时间从10~15min缩短至2 min以内;(2)通过协同指挥平台,将应急方案制订与资源调度决策时间从20 min以上减少至5 min以内,效率提升超80%;(3)形成了基于全流程数据记录的复盘机制,为应急体系的持续优化提供了科学依据。结论认为,该系统的成功构建与应用,为国内外同类高含硫气田的智慧应急建设提供了可复制的成功范式。 展开更多
关键词 四川盆地 特高含硫气田 应急管理 社区应急 应急疏散 智慧化
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Vanadis 4 Extra模具钢的干滑动摩擦性能 被引量:6
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作者 张俊喜 陈百明 +3 位作者 易湘斌 郭小汝 梁泽芬 张振宇 《材料热处理学报》 EI CAS CSCD 北大核心 2017年第4期185-192,共8页
采用"销-盘"摩擦磨损试验测试不同滑动速度下Vanadis 4 Extra和Cr12MoV模具钢干滑动严重磨损的临界载荷,通过SEM、EDS、OM观察磨损形貌并分析磨损机理及原因。结果表明:滑动速度增大,两种钢严重磨损的临界载荷均减小,Vanadis ... 采用"销-盘"摩擦磨损试验测试不同滑动速度下Vanadis 4 Extra和Cr12MoV模具钢干滑动严重磨损的临界载荷,通过SEM、EDS、OM观察磨损形貌并分析磨损机理及原因。结果表明:滑动速度增大,两种钢严重磨损的临界载荷均减小,Vanadis 4Extra和Cr12MoV两种钢严重磨损的临界载荷分别为:0.691 m/s范围内为900 N和600 N;0.921 m/s时为700 N和300 N。载荷小于临界载荷时以磨粒磨损为主,大于临界载荷之后Vanadis 4 Extra以氧化磨损为主,Cr12MoV为氧化磨损和塑性变形。在不同滑动速度及载荷下,Vanadis 4 Extra模具钢的耐磨性均高于Cr12MoV钢3~18.3倍。 展开更多
关键词 Vanadis 4 extra 临界载荷 摩擦因数 磨损率
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平房项目超大瓷板湿贴一次成优施工技术
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作者 李玉建 苏强 +3 位作者 冯维 李扬 刘楠 吴淳 《建筑技术开发》 2026年第2期34-36,共3页
针对1.2 m超大尺寸瓷板湿贴工艺存在的空鼓、脱落风险,结合北京市平房乡姚家园新村三期安置房项目实际需求,通过BIM预排版技术、柔性瓷砖胶选型、机械锚固组合工艺等创新措施,具体从方案优化、工艺流程、操作要点等入手实现湿贴工艺一... 针对1.2 m超大尺寸瓷板湿贴工艺存在的空鼓、脱落风险,结合北京市平房乡姚家园新村三期安置房项目实际需求,通过BIM预排版技术、柔性瓷砖胶选型、机械锚固组合工艺等创新措施,具体从方案优化、工艺流程、操作要点等入手实现湿贴工艺一次成优。工程实践表明,该技术体系可节约成本44万元,墙面垂直度误差不大于1 mm,可为同类项目提供可复制经验。 展开更多
关键词 超大瓷板湿贴 BIM预排版 机械锚固 柔性瓷砖胶 一次成优
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基于翻译内外分野的《装台》英译本译者行为分析
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作者 时健 穆琳 《商洛学院学报》 2026年第1期46-52,共7页
陈彦的长篇小说《装台》以其浓郁的陕西方言与文化底色,成为乡土文学外译的典型样本。以周领顺译者行为批评理论为依据,从“翻译内”与“翻译外”两个维度对《装台》的英译本《The Backstage Clan》进行分析,发现译者的“翻译内”行为... 陈彦的长篇小说《装台》以其浓郁的陕西方言与文化底色,成为乡土文学外译的典型样本。以周领顺译者行为批评理论为依据,从“翻译内”与“翻译外”两个维度对《装台》的英译本《The Backstage Clan》进行分析,发现译者的“翻译内”行为以“求真”为核心,着力实现文化负载词、语气的语用差异、口语表达等元素的忠实再现;“翻译外”行为则以“务实”为导向,通过人名地名翻译、段落结构调整等提升译文的可接受性与传播效力。译者在“求真-务实”连续统评价模式中实现动态平衡,兼顾语言风格、叙事逻辑与文化功能。 展开更多
关键词 译者行为批评理论 《装台》 翻译内 翻译外 乡土文学外译
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Efficacy observation on herpes zoster treated by the comprehensive therapy of blocking, surrounding needling, pricking and cupping combined with bloodletting at Longyan(龙眼, Extra) acupoint 被引量:3
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作者 石跃 张喜鱼 +2 位作者 王建峰 赵紫昊 WANG Fang 《World Journal of Acupuncture-Moxibustion》 2013年第4期15-18,共4页
Objective To observe the analgesic effect on herpes zoster treated by the comprehensive therapy of blocking, surrounding needling, pricking and cupping combined with bloodletting at Longyan (龙眼, Extra) acupoint. M... Objective To observe the analgesic effect on herpes zoster treated by the comprehensive therapy of blocking, surrounding needling, pricking and cupping combined with bloodletting at Longyan (龙眼, Extra) acupoint. Methods According to the random mumber table, 104 cases of herpes zoster were randomized into an observation group and a control group, 52 cases in each one. In the observation group, the blocking method was used at the starting site and the ending site of herpetic zone, the surrounding needling method was applied toward the center of the painful zone, with horizontal needling technique; and the local pricking and cupping methods as well as the bloodletting at Longyan (Extra) acupoint were adopted. In the control group, Jiáj (夹脊 EX-B 2) at the corresponding affected nerve segments and the local Ashi points were selected and stimulated with electroacupuncture. The visual analogue scale (VAS) was adopted to determine the analgesic effect 20 min, 1, 6, 12, 24 and 48 h after treatment separately in each group. Results The onset time of analgesic effect in the observation group was shorter than that in the control group and the efficacy time of duration was longer than that in the control group (all P0.05). The analgesic effect and the result of comprehensive efficacy assessment were superior to those of the control group (both P0.05). Conclusion The comprehensive therapy of blocking, surrounding needling, pricking and cupping method combined with bloodletting at Longyan (Extra) achieves the significant analgesic effect on herpes zoster. 展开更多
关键词 herpes zoster BLOCKING surrounding needling pricking andcupping bloodletting Longyan (龙眼 extra acupoint analgesia
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拉张槽外-槽内地区筇竹寺组页岩气富集主控因素及其地质模式
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作者 陈秋玉 马若龙 +4 位作者 熊亮 何建华 邓虎成 徐浩 魏力民 《科学技术与工程》 北大核心 2026年第1期61-74,共14页
下寒武统筇竹寺组页岩是继龙马溪组后四川盆地天然气增储上产的接替领域,近年来拉张槽外西斜坡-槽内地区多口筇竹寺组页岩气井均获得高产工业气流,但槽外含有机质页岩和槽内富有机质页岩的富集主控因素与地质模式尚不明确,制约了筇竹寺... 下寒武统筇竹寺组页岩是继龙马溪组后四川盆地天然气增储上产的接替领域,近年来拉张槽外西斜坡-槽内地区多口筇竹寺组页岩气井均获得高产工业气流,但槽外含有机质页岩和槽内富有机质页岩的富集主控因素与地质模式尚不明确,制约了筇竹寺组的勘探开发进程。为此,以拉张槽内外筇竹寺组页岩作为研究对象,借助有机地化测试、储层孔结构特征测试、盖层突破压力测试以及脉体流体包裹体测试等技术方法,取得3个方面认识:拉张槽内源储条件优越,且(6)~(8)号小层内,成藏要素配置齐全,气测全烃值高,而槽外西斜坡地区生烃能力有限,(6)~(8)号小层源储结构配置由西向东、由南向北逐渐更有利于页岩气富集成藏;槽内地区和槽外西斜坡北部构造区内顶底板封堵,构造平稳,断裂作用影响小,地层压力以高压为主,发育多套压力封存箱,保存条件较好。而槽外西斜坡南部构造区内断裂发育,地层倾角普遍大于12°,地层压力以常压为主,保存条件一般;研究区页岩气富集地质模式可分为黑色富有机质页岩强生烃弱逸散滞留富集型、含有机质页岩侧向输导体强供给+强自封闭性滞留富集型和含有机质页岩生烃有限+顶板逸散欠富集型。研究结论对于四川盆地页岩气勘探开发具有重要意义。 展开更多
关键词 页岩气 筇竹寺组 主控因素 地质模式 槽外西斜坡 槽内地区
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胫骨逆行髓内钉治疗胫骨远端关节外骨折术后踝前痛发生的研究
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作者 熊远飞 刘晖 +3 位作者 陈添来 林伟斌 张金辉 吴进 《中国修复重建外科杂志》 北大核心 2026年第2期273-277,共5页
目的探讨胫骨逆行髓内钉(retrograde tibial intramedullary nail,RTN)治疗胫骨远端关节外骨折疗效以及术后踝前痛发生情况。方法回顾分析2021年1月—2023年12月RTN内固定治疗的29例外伤致胫骨远端关节外骨折患者临床资料。男19例,女10... 目的探讨胫骨逆行髓内钉(retrograde tibial intramedullary nail,RTN)治疗胫骨远端关节外骨折疗效以及术后踝前痛发生情况。方法回顾分析2021年1月—2023年12月RTN内固定治疗的29例外伤致胫骨远端关节外骨折患者临床资料。男19例,女10例;年龄18~68岁,平均47.3岁。闭合性骨折18例,开放性骨折11例。受伤至入院时间1~5 d,平均3.7 d。记录手术时间、术中出血量,术后骨折愈合情况、患者完全负重时间、疼痛视觉模拟评分(VAS)、Olerud-Molander踝关节骨折功能评分(OMAS)和踝前痛发生情况。结果手术时间43~75 min,平均60.7 min;术中出血量50~120 mL,平均88.3 mL。术后患者均获随访,随访时间14~32个月,平均24.0个月。影像学复查示骨折均愈合,愈合时间3~6个月,平均4.5个月。术后40~63 d患者开始完全负重活动,平均53.3 d。VAS评分术后3个月0~5分,平均2.0分;末次随访时0~3分,平均1.5分。末次随访时,OMAS评分60~95分,平均80.3分;获优3例、良24例、一般2例,优良率93.1%。术后2例(6.9%)出现踝前痛,经取出内固定物后疼痛缓解。结论RTN治疗胫骨远端关节外骨折固定牢固,有利于患者术后早期功能锻炼和负重,且踝前痛发生率较低。 展开更多
关键词 胫骨逆行髓内钉 胫骨远端关节外骨折 踝前痛
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Analysis on the Production Advantages of USA Pima Extra Long Staple Cotton
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作者 田立文 徐志武 +7 位作者 郑子漂 宁新民 崔建平 朱斌 徐海江 郭仁松 林涛 刘志清 《Agricultural Science & Technology》 CAS 2017年第5期892-903,共12页
This paper defines the following advantages of ELS (Extra Long Staple) also known as Pima cotton planted in the United States: first, the only variety which is concentrated in the planting area with good soil moist... This paper defines the following advantages of ELS (Extra Long Staple) also known as Pima cotton planted in the United States: first, the only variety which is concentrated in the planting area with good soil moisture and fertilizer retention performances and abundant light and heat resources; second; advanced and practi- cal material equipment and technology; third; high yield and good quality, significant planting scale benefit; fourth, feasible and reliable modernized intensive farm man- agement mode with large-scale agricultural machinery operation; fifth, high-efficient social services and policy support system, as well as reasonable planting layout, good brand influence, synchronization of high yield and good quality with large-scale benefits. Although the production capability of Pima cotton in the United States is considered to be the largest and most powerful country in the world, compared with the ELS production in China, both have their own advantages and characteristics. Therefore, it is suggested that by using the ELS production experience ol the Unit- ed Stages for reference, China should make use of the modern breeding technJques to accelerate the modification of synthetic genetic features of ELS variety, try its best to breed the ELS variety which is suitable for mechanical plucking as soon as possible, actively develop new technology to simplify the whole cost saving cultiva- tion, reform ELS production organization, vigorously develop the social service sys- tem, and adjust and optimize the ELS industry support policies, so as to fundamen- tally improve the competitiveness of China's ELS in international market. 展开更多
关键词 ELS extra Long Staple) or Pima cotton Natural Ecology Planting lay-out and scale Fiber quality Material equipment
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唐家会煤矿特厚煤层坚硬顶板覆岩破断特征及失稳原因分析
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作者 王江宏 陈肖 +5 位作者 许程远 张猛 苗美荣 王文 王帆 张向阳 《能源与环保》 2026年第1期237-243,共7页
特厚煤层的深部开采,由于其地质条件的复杂性和开采环境的特殊性,围岩控制问题尤为突出。为探究唐家会煤矿61302工作面辅运巷局部失稳原因,通过分析强动载对巷道围岩的弱化作用,调研失稳段前后地质围岩条件,以及对支护方式和支护材料的... 特厚煤层的深部开采,由于其地质条件的复杂性和开采环境的特殊性,围岩控制问题尤为突出。为探究唐家会煤矿61302工作面辅运巷局部失稳原因,通过分析强动载对巷道围岩的弱化作用,调研失稳段前后地质围岩条件,以及对支护方式和支护材料的进一步检测分析,最终得出造成巷道局部失稳的直接和间接原因,并通过数值模拟技术,对工作面上方覆岩破断结构特征进行模拟分析,提出巷道治理及检测建议,为矿井今后生产过程中遇到类似问题提供技术参考和借鉴。 展开更多
关键词 特厚煤层 局部失稳 关键层 多次扰动
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铁路隧道辅助坑道智能优选技术研究
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作者 徐博 刘敬源 +2 位作者 徐亚峰 李螣飞 吴莹 《铁道标准设计》 北大核心 2026年第2期129-136,178,共9页
针对我国铁路隧道大规模建设背景下的辅助坑道设计复杂性和特殊性,开发TUN-INFO隧道信息智能读取模块,应用C++和ObjectARX技术实现对地形地貌以及地质等关键信息的自动提取。综合考虑坡度、长度、角度、山体内地质与地形条件等因素,定... 针对我国铁路隧道大规模建设背景下的辅助坑道设计复杂性和特殊性,开发TUN-INFO隧道信息智能读取模块,应用C++和ObjectARX技术实现对地形地貌以及地质等关键信息的自动提取。综合考虑坡度、长度、角度、山体内地质与地形条件等因素,定义适应隧道施工特点的目标函数,建立多目标多约束优化函数优化辅助坑道设计。基于遗传算法和适应度函数量化隧道总工期、辅助坑道长度和坡度等设计指标。通过算法演化的交叉、选择和变异等流程求解最优辅助坑道设计参数。优化设计结果表明,本研究的智能优化设计技术能够有效满足多种地理限制条件下的隧道辅助坑道智能设计,同时优化辅助坑道布局。以某铁路隧道辅助坑道优化设计为例,优化后总工期为29个月,3个辅助坑道长度分别为1.08,0.84 km以及0.64 km。在保证施工质量的前提下,最大程度地降低施工总工期并提高施工效率,为铁路隧道辅助坑道设计提供科学、系统的智能化解决方案。 展开更多
关键词 铁路隧道 特长隧道 辅助坑道 自动数据读取 全局最优化 遗传算法
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巨厚洛河组下小煤柱双向跳采覆岩离层演化规律研究
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作者 于思源 王晓振 +3 位作者 沙海洋 裴文贤 谢建林 许康 《陕西煤炭》 2026年第2期23-30,共8页
【目的及方法】黄陇侏罗纪煤田顶板赋存有巨厚洛河组含水层,在高强度开采影响下引发离层突水灾害,威胁矿井安全生产。目前对于覆岩离层演化的研究多集中于单工作面,针对亭南煤矿二四盘区工作面实行小煤柱双向跳采的特殊工程条件,通过3DE... 【目的及方法】黄陇侏罗纪煤田顶板赋存有巨厚洛河组含水层,在高强度开采影响下引发离层突水灾害,威胁矿井安全生产。目前对于覆岩离层演化的研究多集中于单工作面,针对亭南煤矿二四盘区工作面实行小煤柱双向跳采的特殊工程条件,通过3DEC数值模拟研究了其覆岩运移与离层演化的基本过程及其规律。【结果】结果表明,离层主要存在于下部关键层(亚关键层Ⅰ、Ⅱ、Ⅲ)和主关键层下,在下部离层逐渐闭合后发育最终止于主关键层,主关键层下出现离层的最早时间是在首采面过钻孔后;在盘区开采过程中导水裂隙带呈“马鞍形”“拱形”“马鞍形”变化,首采面采空对覆岩的影响局限于顶板一个较小的范围内,而在2412面开采后下沉已传递至地表,在3个工作面采完后覆岩进入整体稳沉阶段。【结论】研究结果有助于进一步探明煤层采动影响覆岩运移与离层演化规律,可为类似条件下离层水害防治问题提供一定参考。 展开更多
关键词 巨厚洛河组 跳采 覆岩离层 导水裂隙带
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