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基于变精度概念格的决策推理方法

系统工程理论与实践 2010年第6期30卷 1092-1098页

作者：仇国芳西安建筑科技大学管理学院西安710055

在模糊形式背景上定义了四种外延与内涵均为经典集的变精度概念,证明了它们构成完备格.基于变精度形式概念格和对偶变精度形式概念格,用包含度建立了一类决策推理;基于变精度对象概念格和变精度属性概念格,用包含度建立了另一类决策推理... 详细信息

在模糊形式背景上定义了四种外延与内涵均为经典集的变精度概念,证明了它们构成完备格.基于变精度形式概念格和对偶变精度形式概念格,用包含度建立了一类决策推理;基于变精度对象概念格和变精度属性概念格,用包含度建立了另一类决策推理.通过决策推理将变精度概念格生成的少数决策规则集拓展为所有方案集上的全部决策推理规则,获得了方案集的下近似决策推理规则和上近似决策推理规则,证明了决策推理规则与其对应的决策规则集满足一致性和相容性.

关键词：形式概念分析变精度概念包含度决策规则

Discussion on Development of Silk Weaving Trademark Process in Shang Dynasty of China

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材料科学研究（中英文版） 2013年第3期2卷 41-49页

作者： Xingmei guo Yiping qiu College of Textiles Donghua University Shanghai 201620 P.R.China

达格列净对ST段抬高心肌梗死非糖尿病老年患者急诊经皮冠脉介入术术后心肌微循环及近期预后的影响

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中国合理用药探索 2024年第8期21卷 91-96页

作者：王要鑫秦啸鸣刘洁云秦雷张帅郭秋红开封市中心医院心血管内科开封475000 同济大学附属上海市第十人民医院上海200072

目的:探讨达格列净对ST段抬高心肌梗死(STEMI)非糖尿病老年患者急诊经皮冠脉介入术(PPCI)术后心肌微循环及近期预后的影响。方法:选取2019年5月~2021年1月在某院行PPCI手术治疗的90例STEMI非糖尿病老年患者作为研究对象,采用随机数字表... 详细信息

目的:探讨达格列净对ST段抬高心肌梗死(STEMI)非糖尿病老年患者急诊经皮冠脉介入术(PPCI)术后心肌微循环及近期预后的影响。方法:选取2019年5月~2021年1月在某院行PPCI手术治疗的90例STEMI非糖尿病老年患者作为研究对象,采用随机数字表法分为对照组和观察组,每组45例。对照组给予常规治疗,观察组在对照组基础上给予达格列净片治疗。比较两组患者心功能[左室舒张末内径(LVEDD)、左室射血分数(LVEF)、N端B型脑钠肽前体(NT-proBNP)]、心肌微循环[造影评分指数(CSI)]、血生化指标[葡萄糖(Glu)、尿酸(UA)、白介素-6(IL-6)],并记录两组患者治疗期间不良心血管事件发生情况。结果:治疗后,观察组LVEDD和CSI小于对照组(P0.05)。结论:对于PPCI术后STEMI非糖尿病老年患者,达格列净可带来多种获益,同时可改善心肌微循环,且不增加不良心血管事件。

关键词：达格列净非糖尿病 ST段抬高心肌梗死急诊经皮冠脉介入术心肌微循环

An experimental study on effects of temperature gradient on microstructure of a 308L stainless steel manufactured by directed energy deposition

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Journal of Iron and Steel Research International 2024年第8期31卷 2031-2040页

作者： Ting Dai De-yu Gu Yu-wen qiu Wei guo Hui Ding Yi-wei Sun School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189JiangsuChina

The effect of spatial temperature gradient on the microstructural evolution of a 308L stainless steel during the directed energy deposition(DED)process was experimentally investigated.A novel cooling system was designed and incorporated to a DED system in order to control the temperature gradient along the deposition direction during *** deposition,the workpiece was placed on a lifting platform,and as the deposition process proceeded,the platform and workpiece were gradually lowered into cooling water so that the temperature gradient along the deposition direction could be controlled and maintained stable during the deposition *** microstructure characterization results indicated that a deposition strategy with higher G and G/R values(where G is temperature gradient and R is solidification rate)produced finer cellular grains that were better aligned with the deposition direction,while a deposition strategy with lower G and G/R values produced columnar grains with larger primary arm spacing and less aligned with the deposition direction.

关键词： Additive manufacturing Directed energy deposition Stainless steel Microstructure Temperature gradient

Enhanced nitrate removal from groundwater using a conductive spacer in flow-electrode capacitive deionization

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Chinese Chemical Letters 2024年第8期35卷 379-382页

作者： Hongjie guo Qiang Wei Yangyang Wu Wei qiu Hongliang Li Changyong Zhang College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China CAS Key Laboratory of Urban Pollutant Conversion Department of Environmental Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026China

Flow-electrode capacitive deionization(FCDI)represents a promising approach for ion separation from aqueous ***,the optimization of spacer,particularly for nitrate-contaminated groundwa-ter systems,has often been *** research comprehensively investigates the influence of using a conductive(carbon cloth,CC)spacer on nitrate removal performance within FCDI system,comparing it to a non-conductive(nylon net,NN)*** both CC and NN FCDI systems,it is unsurprisingly that nitrate removal efficiency improved notably with the increasing current density and hydraulic retention time(HRT).Interestingly,the specific energy consumption(SEC)for nitrate removal did not show obvious fluctuations when the current density and HRT varied in both *** the auspiciously optimized process parameters,CC-FCDI attained a 20%superior nitrate removal efficiency relative to NN-FCDI,ac-companied by a notably diminished SEC for CC-FCDI,registering at a mere 28%of *** great improvement can be primarily attributed to the decrement in FCDI internal resistance after using con-ductive spacer,which further confirmed by electrochemical tests such as linear sweep voltammetry(LSV)and electrochemical impedance spectroscopy(EIS).Upon prolonged continuous nitrate removal at the optimized conditions,the CC-FCDI system achieved a consistent 90%nitrate removal efficiency with a low SEC of 2.7-7.8 kWh/kg NO_(3)-N,underscoring its steady ***,this study highlights the pivotal importance of careful spacer design and optimization in realizing energy-efficient groundwater treatment via FCDI.

关键词： Flow-electrode capacitive deionization Carbon cloth Nitrate Underground water Ions transport

Understanding the Thermal Impedance of Silicone Rubber/Hexagonal Boron Nitride Composites as Thermal Interface Materials

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Chinese Journal of Polymer Science 2024年第3期42卷 352-363,I0008页

作者： Yuan Ji Shi-Da Han Hong Wu Shao-Yun guo Feng-Shun Zhang Jian-Hui qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research InstituteSichuan UniversityChengdu 610065China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Silicone rubber(SR) composites are most widely used as thermal interface materials(TIMs) for electronics heat dissipation. Thermal impedance as the main bottleneck limiting the performance of TIMs is usually neglected. Herein, the thermal impedance of SR composites loaded with different levels of hexagonal boron nitride(h-BN) as TIMs was elaborated for the first time by the ASTM D 5470 standard test and finite element analysis. It was found that elastic modulus and surface roughness of SR composites increased with the increase of h-BN content, indicating that the conformity was reduced. When the assembly pressure was 0.69 MPa, there existed an optimal h-BN content at which the contact resistance was minimum(0.39 K·cm^(2)·W^(-1)). Although the decreased bond line thickness(BLT) by increasing the assembly pressure was beneficial to reduce the thermal impedance, the proper assembly pressure should be selected to prevent the warpage of the contact surfaces and the increase in contact resistance, according to the compression properties of the SR composites. This study provides valuable insights into fabrication of high-performance TIMs for modern electronic device applications.

关键词： Thermal interface materials Hexagonal boron nitride Thermal impedance Surfaces

Failure Analysis of Electron Beam Weld Joints for 18Ni Co-free Maraging Steels

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金属热处理 2007年第Z1期32卷 384-389页

作者：莫德锋同济大学

Microstructure of two different 18Ni Co-free maraging specimens and their electron beam weld joints were investigated comparatively by optical microscopy and SEM. It is showing that both of the steels are typical lath martensite, however, one grain size is about three times as another one, and XRD reveals that the amount of the retained austenitic phase in the former is less then the latter. The austenite distributes in plate form along granular and lath boundaries while some in fine particle within the matrix. The microstructural difference between two specimens led to diverse behaviors in electron beam welding. The first specimen is weldable well but the second shows obvious welding defects of pits and burn-through holes in weld face. The welding microstructure exhibits a typical dendritic morphology, and the grains in the heat-affected zone recrystallized and grew up obviously for high temperature heated by welding electron beam. The weldablity is relative to the thermal conduction performance of the base materials,which is contributed greatly for grain size and austenite content.

关键词： maraging steel electron beam welding failure Analysis microstructure

Reactive air wetting and brazing of Al_(2)O_(3) ceramics using Ag-Nb_(2)O_(5) filler: Performance and interfacial behavior

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Journal of Advanced Ceramics 2024年第2期13卷 135-142页

作者： Yudi qiu Shunjian Xu Xiangzhao Zhang Mingfen Zhang Qinhan guo Beiji Wang Guanjun Qiao Guiwu Liu School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Intelligent Manufacturing Huzhou CollegeHuzhou 313000China

We firstly performed the reactive air wetting and brazing of Al_(2)O_(3) ceramics using Ag-(0.5-12)Nb_(2)O_(5) fillers,where Nb_(2)O_(5) can react with liquid Ag and O2 from air to generate AgNbO_(3).The contact angle of the Ag-Nb_(2)O_(5)/Al_(2)O_(3) system almost linearly decreases from~71.6°to 32.5°with the Nb_(2)O_(5) content increasing,and the joint shear strength reaches the maximum of~65.1 MPa while employing the Ag-4Nb_(2)O_(5) filler,which are mainly related to the formation and distribution of the AgNbO_(3) phase at the ***,the interfacial bonding and electronic properties of related interfaces were investigated by first-principles *** calculated works of adhesion(Wa)of Ag(111)/Ag-O-AgNbO_(3)(001)and AgNbO_(3)(001)/Al_(2)O_(3)(100)interfaces are higher than that of the Ag(111)/Al_(2)O_(3)(110)interface,indicating good reliability of the Ag/AgNbO_(3)/Al_(2)O_(3) *** relatively large interfacial charge transfer indicates the formation of Ag-Ag,Al-O,and Ag-O bonds in the Ag/AgNbO_(3)/Al_(2)O_(3) structure,which can contribute to the interfacial bonding.

关键词： reactive air brazing(RAB) wettability microstructure shear strength first-principles calculations

水仙环素通过调控PLK1/AKT信号通路诱导三阴性乳腺癌细胞周期阻滞和凋亡

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浙江中西医结合杂志 2024年第2期34卷 105-111页

作者：郭秋生汤婉芬周师师郑志坚吕仙梅浙江大学医学院附属金华医院肿瘤内科金华321000 浙江大学医学院附属金华医院中心实验室金华321000 浙江省金华市人民医院放疗科金华321000

目的研究水仙环素(Nas)对人三阴性乳腺癌(TNBC)细胞周期和凋亡的抑制作用及分子机制。方法采用细胞增殖-毒性检测试剂盒(CCK-8)、克隆形成、Transwell、流式细胞术等实验分析Nas对TNBC细胞株MDA-MB-231细胞增殖和侵袭能力的抑制作用,及... 详细信息

目的研究水仙环素(Nas)对人三阴性乳腺癌(TNBC)细胞周期和凋亡的抑制作用及分子机制。方法采用细胞增殖-毒性检测试剂盒(CCK-8)、克隆形成、Transwell、流式细胞术等实验分析Nas对TNBC细胞株MDA-MB-231细胞增殖和侵袭能力的抑制作用,及对细胞周期和凋亡的诱导作用;利用免疫印迹(WB)实验分析Nas对MDA-MB-231细胞株cle-Caspase-3、PARP、cle-PARP、PLK1、PI3K、p-PI3K、AKT、p-AKT、CDK1、Cyclin B、Cyclin A、p-21、p-27、p-62、LC3、γ-H2AX等蛋白质的影响。结果不同浓度(0.5、1.0、2.0μmol/L)Nas能抑制MDA-MB-231细胞株的克隆形成(48 h抑制率分别为15.99%、24.76%和54.17%)、侵袭能力(48 h抑制率分别为0.68%、23.20%和45.27%),可将细胞周期阻滞于G2期(48 h阻滞率分别为75.50%、140.56%和316.06%),可对细胞凋亡起到诱导作用(48 h凋亡诱导率分别为105.39%、199.73%和375.74%;72 h凋亡诱导率分别为104.45%、244.96%和709.60%)。分子机制实验显示,Nas可以显著促进cle-Caspase-3、cle-PARP、p-21、p-27及γ-H2AX等蛋白质的表达,显著抑制PLK1、p-PI3K、p-AKT、CDK1、Cyclin B等蛋白质的表达水平,而对p-62、LC3-Ⅱ/Ⅰ等蛋白质的表达水平影响不明显。结论Nas能抑制MDA-MB-231细胞株的克隆形成、侵袭能力,对凋亡起到诱导作用,并将细胞周期阻滞于G2期,该机制可能通过调节PLK1/AKT信号通路来实现。

关键词：三阴性乳腺癌水仙环素凋亡细胞周期 PLK1/AKT信号通路