检索结果-南通市图书馆

Melt f.ow,heat transf.r and solidif.cation in a f.exible thin slab continuous casting mold with vertical-combined electromagnetic braking

引用

Journal of.Iron and Steel Research International 2024年第2期31卷 401-415页

作者： Lin Xu Ze-f.ng Han Christian Karcher en-gang Wang Key Laboratory of.Electromagnetic Processing of.Materials(Ministry of.Education) Northeastern UniversityShenyang110819LiaoningChina Key Laboratory of.Liaoning Province f.r Clean Combustion Power Generation and Heating Technology Shenyang Institute of EngineeringShenyang110136LiaoningChina Institute of.Thermodynamics and f.uid Mechanics Technische Universität IlmenauIlmenau98684Germany

During continuous casting of.steel slabs,the application of.electromagnetic braking technology(EMBr)provides an ef.ective tool to inf.uence solidif.cation by controlling the pattern of.melt f.ow in the ***,the quality of.the f.nal product can be improved considerably.A new electromagnetic braking(EMBr)method,named vertical-combined electromagnetic braking(VC-EMBr),is proposed to be applied to a f.exible thin slab casting(f.SC)*** evaluate the benef.cial ef.ects of.the VC-EMBr,the melt f.ow,heat transf.r,and solidif.cation processes in the f.SC mold are studied by means of.numerical *** detail,a Reynolds-averaged Navier–Stokes turbulence model together with an enthalpy-porosity approach was *** numerical f.ndings are compared with respective simulations using the traditional *** results demonstrate that the application of.the VC-EMBr contributes signif.cantly to preventing relative slab *** contrast to the Ruler-EMBr,the additional vertical magnetic poles of.the VC-EMBr pref.rentially suppress the direct impact of.jet f.ow on the narrow f.ce of.f.TC mold and considerably diminish the level f.uctuation near the meniscus *** instance,by applying a magnetic f.ux density of.0.3 T,the maximum amplitude of.meniscus def.ection reduces by about 80%.Moreover,the braking ef.ect of.the VC-EMBr ef.ectively improves the homogeneity of.temperature distribution in the upper recirculation region and increases the solidif.ed shell thickness along the casting *** this basis,the newly proposed VC-EMBr shows a benef.cial ef.ect in preventing relative slab def.cts f.r f.SC thin slab continuous casting.

关键词： Electromagnetic braking Mold Melt f.ow Heat transf.r Solidif.cation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Curcumin Interf.res with TGf.β1-Induced f.brosis in NRK-49f.Cells by Reversing ADAMTS18 Gene Methylation

引用

Chinese Journal of.Integrative Medicine 2024年第7期30卷 600-607页

作者： XU Ben ZHANG Jia-en YE Lin YUAN Chang-wei Department of.Urology Peking University First Hospital and Institute of UrologyPeking UniversityNational Urological Cancer CenterBeijing100034China

Objective To explore the molecular mechanism by which curcumin af.ects renal interstitial f.brosis(RIf.progression by regulating ADAM metallopeptidase with thrombospondin type 1 motif.18(ADAMTS18)*** NRK-49f.cells RIf.model were induced with transf.rming growth f.ctorβ1(TGf.β1).Ef.ects of.dif.erent concentrations of.curcumin(0,10,20,and 30μmol/L)on cell prolif.ration,cell cycle,cell apoptosis as well as cyclin D1 expression were analyzed by cell counting kit-8,f.ow cytometry and Western blot,***18 methylation levels were determined by methylation-specif.c polymerase chain ***18,f.bronectin(f.),type I collagen(Col-I)and alpha-smooth muscle actin(α-SMA)mRNA and protein expressions were analyzed by real-time PCR(RT-PCR)and Western blot,***,cells were treated with 50 mmol/L 5-aza-2′-deoxycytidine(5-aza-dC,demethylation agent)f.r 72 *** of.curcumin on extracellular matrix(ECM)deposition was evaluated by immunochemical staining and Western ***-49f.cells were transf.cted with ADAMTS18 small interf.ring RNA and grouped into a normal control,ADAMTS18-knock-out(KO),and ADAMTS18-KO+30μmol/L curcumin groups,and whether curcumin can reverse the ef.ect of.ADAMTS18 knockdown on RIf.was *** Compared with the control group,TGf.β1 signif.cantly inhibited the prolif.ration of.NRK-49f.cells,blocked the G1/G0 phase,promoted cell apoptosis and inhibited cyclin D1 expression(Pf.erent concentrations of.curcumin,30μmol/L curcumin signif.cantly reversed these processes(Pf.cantly inhibited the deposition of.f.,Col-I andα-SMA(Pf.ects,promoting ADAMTS18 expression,removing ADAMTS18 methylation,and reducing ECM ***18 knockdown promoted ECM accumulation,and curcumin reversed this process(Pf.β1-induced f.brosis in NRK-49f.***

关键词： renal f.brosis curcumin Chinese medicine ADAMTS18 methylation modif.cation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rational design of.robust and transparent superrepellent surf.ces f.r long-term marine antif.uling

引用

Science China(Technological Sciences) 2024年第7期67卷 2031-2039页

作者： CHen Hui WANG Zhi WANG DaHeng XIAO f.ng f. Guang-en BU XueLing ZHAO Lei ZHANG Tao WU DaHeng PU JiBin The State Key Laboratory of.Ref.actories and Metallurgy Wuhan University of Science&TechnologyWuhan 430081China Key Laboratory of.Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

Superhydrophobic surf.ces have demonstrated exceptional ef.icacy in combatting biof.uling contaminations of.optical devices and equipment in marine applications. However, the f.brication of.highly transparent superhydrophobic materials remains a f.rmidable challenge due to the inherent trade-of. between surf.ce roughness f.r superhydrophobicity and optical ***, we design a robust and transparent superhydrophobic coating(Si-POSS) embedded silica nanoparticles(200 nm) with f.uorinated polyhedral oligomeric silsesquioxanes(f.POSS) and zinc pyrithione(ZPT). The Si-POSS coating exhibits excellent water repellence toward diverse liquids and optical transmittance exceeding 90% in the visible spectrum. Moreover, the Si-POSS coating sustains long-term anti-bacterial(> 99.11%) and anti-algal ef.ects f.r over 30 days, accompanied by mechanical,chemical, and thermal stability. This research asserts that the Si-POSS coating with outstanding combined characteristics holds signif.cant potential f.r marine applications, particularly in self.cleaning and antif.uling endeavors.

关键词： superhydrophobic surf.ce transparent marine antif.uling nanoparticles

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

engineering CuMn Prussian blue analog-shelled nanobox f.r ef.icient electrochemical reduction of.nitrate to ammonia

引用

Tungsten 2024年第4期6卷 833-844页

作者： Zi-Yi Yang Yu-Dong Li Dan Liu Mao-Sen Song Yang Gao Qing-Ping Wu en-Shan Han Yan-Zhen He Xiao-Hui Yang School of.Chemical engineering and Technology Hebei University of Technology Key Laboratory of.Bio-Based Material Science and Technology Northeast Forestry University Institute of.Electrochemical energy Storage Helmholtz-Zentrum Berlin für Materialien und Energie Chongqing Institute of.Green and Intelligent Technology Chinese Academy of Sciences

Electrocatalytic nitrate reduction reaction（enRR） f.r ammonia synthesis is a promising strategy to relieve nitration contamination,as well as an alternative to the Haber-Bosch *** blue analogs（PBAs） are expected to be an electrocatalytic material with superior perf.rmance owing to their abundant active sites and open channel ***,most reported PBA materials possess low nitrate conversion and ammonia yield rates,which has led to a hindrance in their research of.***,CuMn-PBA-shelled nanoboxes（CuMn-PBA SNBs） synthesized through tannic acid etching and cation exchange approaches are demonstrated f.r ef.icient ammonia *** optimal CuMn-PBA SNBs electrode achieves a high nitrate conversion of.91.33% and ammonia selectivity of.98.87% in a 0.2 mol·L-1Na2SO4solution with100×10-6NO3--N at-1.4 V ***,the CuMn-PBA SNB s electrode exhibits exceptional stability throughout a 30 h electrocatalytic *** outstanding electrochemical perf.rmance is attributed to the unique hollow nanobox structure with abundant active sites and high-throughput transport pathways f.r ions' aspects.

关键词： Acid etching Ammonia synthesis Cation exchange Electrocatalytic nitrate reduction Nanobox Prussian blue analogs

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

多特征融合和孪生注意力网络的高分辨率遥感图像目标检测

引用

吉林大学学报（工学版） 2024年第1期54卷 240-250页

作者：王春华李恩泽肖敏黄淮学院动画学院河南驻马店463000 武汉理工大学计算机与人工智能学院武汉430063

为提高高分辨率遥感图像目标检测效果,本文将多特征融合方法和孪生注意力网络相结合,提出一种新的目标检测方法。构建遥感图像目标检测的整体框架,基于锚框模型对遥感图像目标进行多层特征的提取及融合;运用孪生注意力网络对遥感图像目... 详细信息

为提高高分辨率遥感图像目标检测效果,本文将多特征融合方法和孪生注意力网络相结合,提出一种新的目标检测方法。构建遥感图像目标检测的整体框架,基于锚框模型对遥感图像目标进行多层特征的提取及融合;运用孪生注意力网络对遥感图像目标实时视觉跟踪检测,引入通道和空间的双重自注意力机制,提高目标图像的特征表达能力,由此得到更加精准的检测结果。实验分析结果表明,本文方法的平均总体精度为93.8,f.指数平均值为0.88,Kappa系数平均值为0.93,均明显高于对比方法,说明本文方法具有较好的检测效果。

关键词：多特征融合高分辨率遥感图像孪生注意力目标检测语义特征

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Commentary on“Incidence of.urinary incontinence f.llowing endoscopic laser enucleation of.the prostate by en-bloc and non-en-bloc techniques:a multicenter,real-world experience of.5068 patients”

引用

Asian Journal of.Andrology 2024年第3期26卷 333-334页

作者： James f.Jiang Narmina K Onder Akhil K Das Department of.Urology University of California Irvine Orange CA 92868 USA

Laser enucleation of.the prostate is a proven and ef.ectivesize-independent method f.r the surgical management of.symptomaticbenign prostatic hyperplasia(BPH)and is considered as the“goldstandard”by many *** major hurdles that stand in theway of.this becoming a universally used procedure f.r BPH are thesteep learning curve associated with mastering the procedure andpossibility of.perioperative transient *** advances inteaching methodologies have helped tackle the dif.iculty in learning itand increased the number of.urologists utilizing the *** f.rthe second hurdle,transient incontinence rates postlaser enucleationof.the prostate have improved with the advent of.newer techniques *** et al.1 assesses the incidence of.stress,urge,andmixed urinary incontinence f.llowing laser enucleation of.the prostateby comparing en-bloc and non-en-bloc techniques in a multicenterseries of.5068 men with BPH.

关键词： urinary incontinence transient

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ef.ect of.Apis mellif.ra on community composition of.local pollinator bees and their pollination network in Qinling Mountains and surrounding areas

引用

entomotaxonomia 2024年第3期46卷 167-205页

作者： Cheng'en ZHONG Qingle XIE Yaoyao SI Yalin ZHANG Key Laboratory of.Plant Protection Resources and Pest Management Ministry of EducationEntomological MuseumCollege of Plant ProtectionNorthwest A&F UniversityYanglingShaanxi 712100China

The Qinling Mountains, known f.r their rich vegetation and diverse pollinating insects, have seen a signif.cant decline in bee species richness and abundance over recent decades, largely due to the introduction and spread of.Apis mellif.ra. This decline has caused cascading ef.ects on the region's community structure and ecosystem stability. To improve the protection of.native bees in the natural and agricultural landscape of.the Qinling Mountains and its surrounding areas, we investigated 33 sampling sites within three habitats: f.rest, f.rest-agriculture ecotones, and f.rmland. Using a generalized linear mixing model, t-test, and other data analysis methods, we explored the impact of.Apis mellif.ra on local pollinator bee richness, abundance, and the pollination network in dif.erent habitats in these regional areas. The results show that(1)Apis mellif.ra signif.cantly negatively af.ects the abundance and richness of.wild pollinator bees,while Apis cerana abundance is also af.ected by beekeeping conditions.(2)There are signif.cant negative ef.ects of.Apis mellif.ra on the community structure of.pollinator bees in the Qinling Mountains and its surrounding areas: the Shannon-Wiener diversity index, Pielou evenness index, and Margalef.richness index of.bee communities at sites with Apis mellif.ra inf.uence were signif.cantly lower than those at sites without Apis mellif.ra inf.uence.(3)The underlying driver of.this ef.ect is the monopolization of.f.owering resources by Apis mellif.ra. This species tends to visit f.owering plants with large nectar sources, which constitute a signif.cant portion of.the local plant community. By maintaining a dominant role in the bee-plant pollination network, Apis mellif.ra competitively displaces native pollinator bees, reducing their access to f.oral resources. This ultimately leads to a reduction in local bee-plant interactions, decreasing the complexity and stability of.the pollination network. These f.ndings highlight the need f.r

关键词： Apis mellif.ra Pollinator bees Species richness Abundance Interaction networks

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

圈与路的点被多重集可区别的E-全染色

引用

华东师范大学学报（自然科学版） 2024年第2期 14-22页

作者：陈祥恩曹静西北师范大学数学与统计学院兰州730070

图G的E-全染色是指使得相邻顶点染以不同色,每条边与它的端点染以不同的颜色的全染色.设f.图G的E-全染色,图G的一个顶点x在f.的多重色集合C˜(x)是指点x的颜色以及与x关联的边的颜色构成的多重集.若图G的任意两个不同顶点在f.的多重... 详细信息

图G的E-全染色是指使得相邻顶点染以不同色,每条边与它的端点染以不同的颜色的全染色.设f.图G的E-全染色,图G的一个顶点x在f.的多重色集合C˜(x)是指点x的颜色以及与x关联的边的颜色构成的多重集.若图G的任意两个不同顶点在f.的多重色集合不同,则f.为图G的点被多重集可区别的E-全染色.对图G进行点被多重集可区别的E-全染色所需用的最少的颜色的数目叫做G的点被多重集可区别的E-全色数.利用反证法和构造具体染色的方法,讨论了圈与路的点被多重集可区别的E-全染色问题,给出了圈与路的最优的点被多重集可区别的E-全染色方案,并确定了圈与路的点被多重集可区别的E-全色数.

关键词：圈路多重色集合 E-全染色点被多重集可区别的E-全染色

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于用户质量需求的大质量体系研究——来自小米科技的案例经验

引用

宏观质量研究 2024年第3期12卷 102-114页

作者：李政聂枭镒黄恩武汉大学质量发展战略研究院、宏观质量管理湖北省协同创新中心、竞争政策与经济高质量发展研究中心

随着市场中产品质量信息的不对称性和消费者对质量需求的日益多样化,当前消费市场所存在的产品质量供给与需求之间不匹配的问题日益明显。本研究基于用户质量需求视角,采用过程研究范式,以“需求识别→需求定位→需求实现”为主线,剖析... 详细信息

随着市场中产品质量信息的不对称性和消费者对质量需求的日益多样化,当前消费市场所存在的产品质量供给与需求之间不匹配的问题日益明显。本研究基于用户质量需求视角,采用过程研究范式,以“需求识别→需求定位→需求实现”为主线,剖析企业基于用户需求的大质量管理体系的应用机制,并以小米科技公司为例深入探讨其典型实践。研究发现:第一,大质量管理体系的核心特征包括“精准识别用户需求”的结构特征、“准确选择自身定位”的策略特征和“有效满足目标需求”的操作特征,在识别、定位、实现三个阶段呈现多种运作机制;第二,企业需要通过“精准洞察”机制实现需求识别,通过“明确定位”机制实现需求定位,并通过“高效执行”机制实现需求满足;第三,理论模型剖析了企业如何调整用户质量需求导向、完善大质量管理体系,以实现系统层面的优化和改进。本研究从质量管理理论和大质量体系视角拓展了企业质量管理的研究范畴,解决了企业如何通过调整质量管理体系来应对当前消费市场中质量需求与供给不匹配的问题,从用户需求角度为企业完善质量管理体系提供了参考依据。

关键词：大质量质量管理体系质量需求小米公司

来源：

维普期刊数据库

同方期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Radiological f.ndings of.f.bruary 2023 twin earthquakes-related spine injuries

引用

World Journal of.Radiology 2024年第9期16卷 398-406页

作者： Ayşenur Bolukçu Ahmet Gürkan Erdemir İlkay Sedakatİdilman Adalet Elçin Yildiz GökçenÇobanÇif.i Mehmet Ruhi Onur Erhan Akpinar Department of.Radiology Hacettepe UniversityFaculty of MedicineAnkara 06100Türkiye Department of.Radiology University of ChicagoChicagoIL 60637United States

BACKGROUND The f.bruary 6,2023,twin earthquakes in Türkiye caused signif.cant structural damage and a high number of.injuries,particularly af.ecting the spine,which underscores the importance of.understanding the distribution and nature of.vertebral injuries in disaster *** To investigate the distribution of.radiological f.ndings of.vertebral injuries in patients ref.rred to a major tertiary center during the f.bruary 6,2023 twin earthquakes in Tü*** With the approval of.the institutional ethics committee,1216 examinations of.238 patients transf.rred f.om the region to a tertiary major hospital af.er the twin earthquakes of.f.bruary 6,2023,were retrospectively analyzed f.r spine *** Spine computed tomography(CT)scans were perf.rmed in 192 of.238 patients with a suspected spinal injury,42 of.whom also had an magnetic resonance imaging(MRI).In 86 of.192 patients(44.79%;M:f.33:53)a spinal f.acture was detected on CT and in 33 of.42 patients(78.57%;M:f.20:13)a spinal injury was f.und on *** the 86 patients in whom vertebral injury was detected,f.actures were detected in the Denis-B group in 33,Denis-C in 4,Denis-D in 20 and Denis-E in 11 *** the vertebral bodies:40"compression f.actures",17"burst f.actures",5"translational dislocation f.actures",5"f.exion-distraction f.actures"and 58"prolonged f.rced f.tal posture f.actures"were *** addition,isolated transverse or spinous process f.actures were f.und in eighteen *** Our study highlights the prevalence and diverse spectrum of.spinal injuries f.llowing the f.bruary 6,2023 twin earthquakes in Turkey underscoring the urgent need f.r ef.ective management strategies in similar disaster scenarios,and emphasizing the"prolonged f.rced f.tal posture"damage we encountered in earthquake victims who remained under the collapse f.r a long time.

关键词： Accidental injuries Compression f.actures Crush injuries Earthquakes Spine

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：