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基于均衡聚类索引的近似最近邻检索方法

南京师大学报（自然科学版） 2024年第2期47卷 99-108页

作者：吕宏伟李博刘普凡刘识李继伟刘俊健国家电网大数据中心江苏南京210023

大数据时代,深度学习通过将复杂对象表示为高维特征向量,并使用向量之间的距离度量来衡量样本的相似性,在推荐系统、用户画像、数据中台管理等场景中得到了广泛的应用.但是,随着数据规模的不断增加,海量特征数据的相似向量检索面临着检... 详细信息

大数据时代,深度学习通过将复杂对象表示为高维特征向量,并使用向量之间的距离度量来衡量样本的相似性,在推荐系统、用户画像、数据中台管理等场景中得到了广泛的应用.但是,随着数据规模的不断增加,海量特征数据的相似向量检索面临着检索模型占用内容大、特征检索算法召回率较低的严重挑战.如何在保证检索精度的前提下,设计紧凑型索引图结构,降低特征检索的内存消耗,对于提升大数据系统的近邻检索效率具有重要的作用.因此,本文提出了一种均衡感知的快速K均值近邻聚类的特征数据分桶及其图结构紧凑型索引用于海量数据近邻检索.首先,设计了均衡感知的快速K-均值聚类算法,通过在图索引构建过程中海量特征数据的均衡分桶,将高维向量压缩成轻量级紧凑型图索引结构,随后通过量化操作进一步压缩高维向量样本,提升其在候选集上的最近邻检索速度.在基准数据集上实验验证结果表明,本文提出的方法能够在保证较高检测召回率的同时,有效加快索引构建速度,可以用于支持高维特征数据的高效最近邻检索.

关键词：大数据检索与分析最近邻搜索均衡感知

管道初始状态对P92钢细晶区组织和性能的影响研究

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热加工工艺 2024年第13期53卷 75-78,84页

作者：李勇王家庆刘俊健杜成超赵晓华大唐锅炉压力容器检验中心有限公司安徽合肥230088 江苏大学材料科学与工程学院江苏镇江212013 中国大唐集团科学技术研究总院有限公司华东电力试验研究院安徽合肥230088

本研究以新旧P92钢管为研究对象,基于快速热处理方法制备了细晶热影响区棒状试样,通过扫描电镜、透射电镜观察,显微硬度、蠕变实验对比了两种细晶区的显微组织和力学性能,揭示了管道初始状态对P92钢细晶区组织和性能的影响。结果表明:与... 详细信息

本研究以新旧P92钢管为研究对象,基于快速热处理方法制备了细晶热影响区棒状试样,通过扫描电镜、透射电镜观察,显微硬度、蠕变实验对比了两种细晶区的显微组织和力学性能,揭示了管道初始状态对P92钢细晶区组织和性能的影响。结果表明:与P92新管细晶区相比,P92旧管细晶区的位错密度低,析出相粗大,降低了其硬度和蠕变抗力。蠕变过程中,P92旧管细晶区的Laves相析出倾向更大,促进蠕变空洞的形成,加速蠕变断裂,缩短了其蠕变寿命。

关键词： P92耐热钢 Laves相硬度蠕变断裂

X60、X70管线钢及其焊接接头氢脆敏感性的对比研究

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表面技术 2024年第4期53卷 117-124页

作者：王万里陈烨占先强刘俊建汤文明大唐锅炉压力容器检验中心有限公司合肥230088 大唐华东电力试验研究院合肥230088 合肥工业大学材料科学与工程学院合肥230009

目的开展电解渗氢管线钢及其焊接接头显微组织和力学性能研究,为掺氢天然气管线服役安全可靠性评估提供支持。方法X60、X70管线钢及其焊接接头试样在100mA/cm^(2)下进行24h电解渗氢后,开展有、无渗氢情况下相关试样的显微组织结构、氢... 详细信息

目的开展电解渗氢管线钢及其焊接接头显微组织和力学性能研究,为掺氢天然气管线服役安全可靠性评估提供支持。方法X60、X70管线钢及其焊接接头试样在100mA/cm^(2)下进行24h电解渗氢后,开展有、无渗氢情况下相关试样的显微组织结构、氢热脱附、拉伸力学性能与断口形貌测试分析,揭示渗氢对X60、X702种管线钢及其焊接接头氢脆敏感性的影响规律。结果X60及X70管线钢以细小多边形铁素体为主,其焊缝和热影响区以粗大的粒状或板条贝氏体为主。相对于X70管线钢,其焊接接头具有更高的氢渗透性和稳定性。渗氢导致X60、X70管线钢及其焊接接头试样的强度与塑性降低,渗氢X70焊接接头力学性能衰减最为明显,拉伸断口呈准解理断裂特征。结论X70管线钢的氢脆敏感性高于X60管线钢,管线钢焊接接头的氢脆敏感性高于母材。

关键词：管线钢焊接接头电解渗氢热脱附氢脆敏感性

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1000MW机组汽轮机深度调峰损伤分析三维建模技术研究

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电力设备管理 2024年第3期 142-144页

作者：刘俊建王万里孙轩刘晓云大唐华东电力试验研究院上海如为电力科技有限公司

本文介绍了1000MW机组汽轮机部件三维建模技术。通过安装资料得到某超超临界机组汽轮机高中低压转子体、动静叶片、汽缸等部位基本尺寸和结构形式;针对结构突变、叶根等容易引起应力集中或应力变化频繁部位进行精细化扫描。通过有限元... 详细信息

本文介绍了1000MW机组汽轮机部件三维建模技术。通过安装资料得到某超超临界机组汽轮机高中低压转子体、动静叶片、汽缸等部位基本尺寸和结构形式;针对结构突变、叶根等容易引起应力集中或应力变化频繁部位进行精细化扫描。通过有限元软件导入接口,实现了部件的完整导入,为后续汽轮机部件调峰状态寿命损伤分析打好基础。

关键词：汽轮机深度调峰三维建模三维扫描有限元分析

茵陈五苓散对湿重于热型阻塞性黄疸胆道术后T细胞亚群的影响

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天津医科大学学报 2024年第1期30卷 1-5页

作者：韩树旺尚海涛张德林郝成飞刘军舰天津市中西医结合医院肝胆胰外科天津300100

目的:探讨茵陈五苓散对胆道结石引起的阻塞性黄疸患者胆道术后T细胞亚群的变化。方法:选取2021年6月至2022年3月就诊于天津市中西医结合医院肝胆胰外科诊断为良性阻塞性黄疸患者,共76例,患者随机分为对照组和观察组,在胆道术后对照组给... 详细信息

目的:探讨茵陈五苓散对胆道结石引起的阻塞性黄疸患者胆道术后T细胞亚群的变化。方法:选取2021年6月至2022年3月就诊于天津市中西医结合医院肝胆胰外科诊断为良性阻塞性黄疸患者,共76例,患者随机分为对照组和观察组,在胆道术后对照组给予西医常规治疗,观察组在常规治疗基础上加用茵陈五苓散方(颗粒剂),两组治疗周期均为7 d。观察两组治疗前后外周静脉血T淋巴细胞亚群水平和细胞因子[白细胞介素(IL)-10、转化生长因子(TGF)-β_(1))]浓度变化。结果:两组患者在胆道术后治疗5 d、7 d,CD3^(+)T淋巴细胞、CD4^(+)T淋巴细胞、CD4^(+)/CD8^(+)比值均较术前1 d增加(均P0.05)。与对照组相比,观察组术后5 d、7 d,IL-10、TGF-β_(1)浓度降低(均P<0.05)。结论:胆道术后早期联合茵陈五苓散对机体细胞免疫功能恢复有重要的辅助作用,具有一定的免疫调节作用。

关键词：阻塞性黄疸胆总管结石茵陈五苓散 T淋巴细胞亚群细胞因子

Amino-functionalized UiO-66-doped mixed matrix membranes with high permeation performance and fouling resistance

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Chinese Journal of Chemical Engineering 2024年第3期67卷 68-77页

作者： Yi Zhang Di liu Zhaoli Wang junjian Yu Yanyin Cheng Wenjing Li Zhe Wang Hongzhe Ni Yuchao Wang School of Chemical Engineering Changchun University of TechnologyChangchun 130012China Advanced Institute of Materials Science Changchun University of TechnologyChangchun 130012China Key Laboratory of Advanced Functional Polymer Membrane Materials of Jilin Province Changchun 130012China School of Chemistry and Life Science Changchun University of TechnologyChangchun 130012China

For the reduction of bovine serum proteins from wastewater,a novel mixed matrix membrane was prepared by functionalizing the substrate material polyaryletherketone(PAEK),followed by carboxyl groups(C-SPAEKS),and then adding amino-functionalized UiO-66-NH_(2)(Am-UiO-66-NH_(2)).Aminofunctionalization of UiO-66 was accomplished by melamine,followed by an amidation reaction to immobilize Am-UiO-66-NH_(2),which was immobilized on the surface of the membrane as well as in the pore channels,which enhanced the hydrophilicity of the membrane surface while increasing the negative potential of the membrane *** nanoparticle-loaded ultrafiltration membrane has good permeation performance,with a pure water flux of up to 482.3 L·m^(-2)·h^(-1) for C-SPAEKS/AmUiO-66-NH_(2) and a retention rate of up to 98.7%for bovine serum albumin(BSA)-contaminated ***,after several hydrophilic modifications,the flux recovery of BSA contaminants by this series of membranes increased from 56.2%to 80.55%of pure *** results of ultra-filtration flux time tests performed at room temperature showed that the series of ultrafiltration membranes remained relatively stable over a test time of 300 ***,the newly developed mixed matrix membrane showed potential for high efficiency and stability in wastewater treatment containing bovine serum proteins.

关键词： Ultrafiltration Mixed matrix membranes Amino functionalization Hydrophilic modification Negatively charged

Current Status and Research Progress of Neoadjuvant Chemotherapy for Locally Advanced Gastric Cancer

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Journal of Biosciences and Medicines 2023年第3期11卷 156-170页

作者： junjian liu Tian Wei Zhiping Xiang Yinlu Ding Department of Gastrointestinal Surgery The Second Hospital Cheeloo College of Medicine Shandong University Jinan China

Gastric cancer is one of the most common malignant tumours worldwide, with a high degree of malignancy and a poor prognosis. While early gastric cancer can be cured by surgical treatment, locally advanced gastric cancer requires neoadjuvant therapy to shrink the tumour, suppress potential metastases, achieve down-staging, and provide patients with the opportunity for radical surgery to prolong their survival. This article reviews the current status and progress of neoadjuvant chemotherapy for locally advanced gastric cancer.

关键词： Locally Advanced Gastric Cancer Adjuvant Chemotherapy Neoadjuvant Chemotherapy

Amine-functionalized metal organic framework@graphene oxide as filler in PAEK-containing carboxyl group membrane for ultrafiltration with ultra-high permeability and strong fouling resistance

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Chinese Journal of Chemical Engineering 2024年第6期70卷 93-103页

作者： Zhaoli Wang Wenjing Li Yi Zhang Yanyin Cheng junjian Yu Tianming Dong Xiaoyu Chi Di liu Zhe Wang School of Chemistry and Life Science Changchun University of TechnologyChangchun 130012China Advanced Institute of Materials Science Changchun University of TechnologyChangchun 130012China Key Laboratory of Advanced Functional Polymer Membrane Materials of Jilin Province Changchun 130012China

Achieving high fouling resistance and permeability using membrane separation technology in water treatment processes remains a *** this work,a novel mixed-matrix membrane(MMM)(poly(arylene ether ketone)[PAEK]-containing carboxyl groups[PAEK-COOH]/UiO-66-NH_(2)@graphene oxide[GO])with superb fouling resistance and high permeability was prepared by the nonsolvent-induced phase separation method,by in-situ growth of UiO-66-NH_(2) on the GO layer,and by preparing hydrophilic *** the basis of the structure and performance analysis of the MMM,the maximum water flux reached 591.25 L·m^(-2)·h^(-1) for PAEK-COOH/UiO-66-NH_(2)@GO,whereas the retention rate for bovine serum albumin increased from 85.40%to 94.87%.As the loading gradually increased,the hydrophilicity of the MMMs increased,significantly enhancing their fouling *** strongest anti-fouling ability observed was 94.74%,which was 2.02 times greater than that of the pure *** the same time,the MMMs contained internal amide and hydrogen bonds during the preparation process,forming a cross-linked structure,which further enhanced the mechanical strength and chemical *** summary,the MMMs with high retention rate,strong permeability,and anti-fouling ability were successfully prepared.

关键词： Poly(arylene ether ketone)-containing Carboxyl groups (PAEK-COOH) UiO-66-NH_(2)@graphene oxide Hydrophilic modification Ultra-high selectivity Strong anti-fouling

Arbuscular mycorrhizal fungi regulate plant mineral nutrient uptake and partitioning in iron ore tailings undergoing eco-engineered pedogenesis

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Pedosphere 2024年第2期34卷 385-398页

作者： Zhen LI Songlin WU Yunjia liu Qing YI Merinda HALL Narottam SAHA junjian WANG Yuanfang HUANG Longbin HUANG College of Land Science and Technology China Agricultural UniversityBeijing 100193China Centre for Mined Land Rehabilitation Sustainable Minerals InstituteThe University of QueenslandBrisbaneQLD 4072Australia Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Excess available K and Fe in Fe ore tailings with organic matter amendment and water-deficiencies may restrain plant colonization and growth,which hinders the formation of eco-engineered soil from these tailings for sustainable and cost-effective mine site *** mycorrhizal(AM)fungi are widely demonstrated to assist plant growth under various unfavorable ***,it is still unclear whether AM symbiosis in tailings amended with different types of plant biomass and under different water conditions could overcome the surplus K and Fe stress for plants in Fe ore tailings,and if so,by what ***,host plants(Sorghum *** ***),either colonized or noncolonized by the AM fungi(Glomus spp.),were cultivated in lucerne hay(LH,C:N ratio of 18)-or sugarcane mulch(SM,C:N ratio of 78)-amended Fe ore tailings under well-watered(55%water-holding capacity(WHC)of tailings)or water-deficient(30%WHC of tailings)*** mycorrhizal colonization,plant growth,and mineral elemental uptake and partitioning were *** indicated that AM fungal colonization improved plant growth in tailings amended with plant biomass under water-deficient *** mycorrhizal fungal colonization enhanced plant mineral element uptake,especially P,both in the LH-and SM-amended tailings regardless of water ***,AM symbiosis development restrained the translocation of excess elements(i.e.,K and Fe)from plant roots to shoots,thereby relieving their *** AM fungal roles in P uptake and excess elemental partitioning were greater in LH-amended tailings than in SM-amended *** deficiency weakened AM fungal colonization and functions in terms of mineral element uptake and *** findings highlighted the vital role AM fungi played in regulating plant growth and nutrition status in Fe ore tailings technosol,providing an important basis for involvement of AM fungi in the eco-engineered pedo

关键词： Fe stress fungal symbiosis K stress mine site rehabilitation mycorrhizal colonization plant biomass amendment plant nutrition water deficiency