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PLS质量监控及其在Tennessee Eastman过程中的应用 被引量:11
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作者 宋凯 王海清 李平 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2005年第5期657-662,共6页
研究质量监测在部分最小二乘(PLS)框架下的可检测性问题,并给出一种新的主成分确定方法.根据故障子空间和变量的显著性测度确定不同故障对质量的影响力,定义最优检测函数,进而建立PLS最优检测模型(ODM),使模型对严重影响产品质量的重要... 研究质量监测在部分最小二乘(PLS)框架下的可检测性问题,并给出一种新的主成分确定方法.根据故障子空间和变量的显著性测度确定不同故障对质量的影响力,定义最优检测函数,进而建立PLS最优检测模型(ODM),使模型对严重影响产品质量的重要过程故障具有最优检测能力.以TennesseeEastman(TE)过程为案例进行统计质量控制研究,结果表明此方法对重要过程故障的敏感性很高,有助于及时采取补救措施,稳定产品质量. 展开更多
关键词 部分最小二乘(PLS) tennessee Eastman过程 统计质量控制(SQC)
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Tennessee-Eastman过程的学习型案例推理故障诊断方法 被引量:4
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作者 严爱军 王英杰 王殿辉 《控制理论与应用》 EI CAS CSCD 北大核心 2017年第9期1179-1184,共6页
为了提高Tennessee-Eastman(TE)过程的故障诊断准确率,本文研究一种学习型伪度量(learning pseudo metric,LPM)代替距离度量的案例检索方法,并建立了TE过程的案例推理(case-based reasoning,CBR)故障诊断模型.首先建立LPM度量准则并对LP... 为了提高Tennessee-Eastman(TE)过程的故障诊断准确率,本文研究一种学习型伪度量(learning pseudo metric,LPM)代替距离度量的案例检索方法,并建立了TE过程的案例推理(case-based reasoning,CBR)故障诊断模型.首先建立LPM度量准则并对LPM模型进行训练,其次度量目标案例与每一个源案例的相似度,从中检索与目标案例相似的同类案例,再采用多数重用原则从同类案例中决策出目标案例的解,最后通过TE过程的运行数据对该方法的性能进行测试,并与典型的CBR和BP(back-propagation)神经网络和支持向量机等方法进行对比,表明本文方法能有效提高故障诊断准确率,在实际化工过程中具有一定的推广应用价值. 展开更多
关键词 te过程 故障诊断 案例推理 学习型伪度量 案例检索
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Tennessee River Resource Stewardship and Protection: The Tennessee River Line Trail Project and Partnerships 被引量:1
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作者 Kenneth R. Olson 《Journal of Water Resource and Protection》 2020年第12期1053-1076,共24页
The Tennessee River had a long and colorful history of transporting Native Americans, settlers, armies, and cargo of all types in 1700s and 1800s. The headwaters of the Tennessee River, the largest tributary of the Oh... The Tennessee River had a long and colorful history of transporting Native Americans, settlers, armies, and cargo of all types in 1700s and 1800s. The headwaters of the Tennessee River, the largest tributary of the Ohio River, originates in the Appalachian Mountains of eastern United States. Created by the confluence of the Holston and French Broad rivers at Knoxville, the Tennessee River flows approximately 1049 km to Paducah, Kentucky where it drains into the Ohio River. This paper highlights how the landscape and geological resources of the Tennessee River and tributaries watershed contributed to the successful economic development of this historical region of North America. The Tennessee River is one of the most biologically diverse freshwater systems in the United States. Environmental challenges included an unsuccessful attempt to keep invasive species, such as the Asian carp, out of the Tennessee River and the Kentucky Lake. The 1049 river kilometer Tennessee River regional trail system with charter River Towns was designed to promote recreational tourism, increase the use of the Tennessee River and to create generations of people who care about the river and are willing to provide environmental stewardship of the watershed resources and protect the river. 展开更多
关键词 Flood of 1937 Kentucky Dam Kentucky Lake Navigation Big Head Carp Silver Carp Paducah KENTUCKY tennessee Valley Authority TVA
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VPLS Based Quality and Cost Control for Tennessee Eastman Process 被引量:1
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作者 宋凯 王海清 李平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第1期62-67,共6页
Product quality and operation cost control obtain increasing emphases in modern chemical system engineering. To improve the fault detection power of the partial least square (PLS) method for quality control, a new QRP... Product quality and operation cost control obtain increasing emphases in modern chemical system engineering. To improve the fault detection power of the partial least square (PLS) method for quality control, a new QRPV statistic is proposed in terms of the VP (variable importance in projection) indices of monitored process variables, which is significantly advanced over and different from the conventional Q statistic. QRPV is calculated only by the residuals of the remarkable process variables (RPVs). Therefore, it is the dominant relation between quality and RPV not all process variables (as in the case of the conventional PLS) that is monitored by this new VP-PLS (VPLS) method. The combination of QRPV and T2 statistics is applied to the quality and cost control of the Tennessee Eastman (TE) process, and weak faults can be detected as quickly as possible. Consequently, the product quality of TE process is guaranteed and operation costs are reduced. 展开更多
关键词 partial least squares method tennessee Eastman process statistical quality control cost control on-line monitoring
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A 15-year-Long catalog of seismicity in the Eastern Tennessee Seismic Zone(ETSZ)using matched filter detection 被引量:1
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作者 Clara Daniels Zhigang Peng 《Earthquake Research Advances》 CSCD 2023年第1期92-105,共14页
We present a detailed catalog of 13671 earthquakes in the Eastern Tennessee Seismic Zone(ETSZ)that spans January 1,2005 to July 31,2020.We apply a matched filter detection technique on over 15 years of continuous data... We present a detailed catalog of 13671 earthquakes in the Eastern Tennessee Seismic Zone(ETSZ)that spans January 1,2005 to July 31,2020.We apply a matched filter detection technique on over 15 years of continuous data,resulting in arguably the most complete catalog of seismicity in the ETSZ yet.The magnitudes of newly detected events are determined by computing the amplitude ratio between the detections and templates using a principal component fit.We also compute the b-value for the new catalog and comparatively relocate a subset of newly detected events using XCORLOC and hypoDD,which shows a more defined structure at depth.We find the greatest concentration along and to the east of the New York-Alabama Lineament,as defined by the magnetic anomaly,supporting the argument that this feature likely is related to the generation of seismicity in the ETSZ.We examine seismicity in the vicinity of the Watts Bar Reservoir,which is located about 5 km from the epicenter of the M_(W) 4.4 December 12,2018 Decatur,Tennessee earthquake,and find possible evidence for reservoir modulated seismicity in this region.We also examine seismicity in the entire ETSZ to search for a correlation between shallow earthquakes and seasonal hydrologic changes.Our results show limited evidence for hydrologicallydriven shallow seismicity due to seasonal groundwater levels in the ETSZ,which contradicts previous studies hypothesizing that most intraplate earthquakes are associated with the dynamics of hydrologic cycles. 展开更多
关键词 Eastern tennessee Seismic Zone Matched filter detection Intraplate earthquakes Reservoir modulated seismicity
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Cathodoluminescence Characteristics and Mineral Chemistry of Tennessee Sphalerites (Tn-Usa)
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作者 Emin ifti H.Haluk Selim Dougles Crowe 《矿物学报》 CAS CSCD 北大核心 2013年第S1期21-21,共1页
Optical cathodoluminescence microscopy (CLM) can provide very useful information both on mineral zoning formed during crystal growth and on variations in chemical composition of sphalerites which is reflected by their... Optical cathodoluminescence microscopy (CLM) can provide very useful information both on mineral zoning formed during crystal growth and on variations in chemical composition of sphalerites which is reflected by their visible colors. Gem quality sphalerite crystals associated with dolomite, calcite and fluorite having 3 different visible colors - green, honey and brown - were studied to compare their mineral chemistry and CL characteristics. Electron microprobe analyses indicated essentially no significant differences in terms of major components. Although the common CL-quencher ferrous iron contents of all three were lower than 0.25 wt %, none of the sphalerites cathodoluminescenced: two (brown and honey) were non-CL, the green sphalerite showed very week CL in faint brown color. Other trace elements that were analyzed include Fe, Cd, Mn, Ag, Hg, In, Bi, Cu, Ge, and Ga. Fe, Cd, Ga and Cu were relatively higher than the others. Most significant differences with respect to the common trace elements include honey colored sphalerites are essentially Fe- and Cd-poor but rich in Ga, green sphalerites are Fe- and Cd- rich but poor in all the others, and brown sphalerites are rich in Cd. No conclusive relation between non-CL behavior of all three sphalerites and their trace element chemistry was established, however; low quantities of common CL activators in sphalerite crystal structures such as Mn, Cu, and In were the main cause of the non-CL behavior. 展开更多
关键词 SPHALERIte CATHODOLUMINESCENCE EPMA Elmwood tennessee
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n型Bi_(2-x)Sb_(x)Te_(3-y)Se_(y)基化合物的缺陷结构调控与电热输运性能
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作者 李睿英 罗婷婷 +6 位作者 李貌 陈硕 鄢永高 吴劲松 苏贤礼 张清杰 唐新峰 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第9期244-253,共10页
Bi_(2)Te_(3)基化合物是目前室温附近性能最好的热电材料,但其存在着大量复杂的缺陷结构,缺陷工程是调控材料热电性能的核心手段,因此理解和有效地调控缺陷形态和浓度是获得高性能Bi_(2)Te_(3)基热电材料的关键.本文系统地研究了四元n型... Bi_(2)Te_(3)基化合物是目前室温附近性能最好的热电材料,但其存在着大量复杂的缺陷结构,缺陷工程是调控材料热电性能的核心手段,因此理解和有效地调控缺陷形态和浓度是获得高性能Bi_(2)Te_(3)基热电材料的关键.本文系统地研究了四元n型Bi_(2-x)Sb_(x)Te_(3-y)Se_(y)基化合物的缺陷演化过程及其对热电输运性能的影响规律.Sb和Se的固溶引入的带电伴生结构缺陷使得材料的载流子浓度发生了巨大变化,在Bi_(2-x)Sb_(x)Te_(2.994)Cl_(0.006)样品中,Sb的固溶降低了反位缺陷Sb_(Te)_(2)形成能,诱导产生了反位缺陷Sb_(Te)_(2),使得少数载流子空穴浓度从2.09×10^(16)cm^(-3)增加至3.99×10^(17)cm^(-3),严重劣化了电性能.在Bi_(1.8)Sb_(0.2)Te_(2.994-y)Se_(y)Cl_(0.006)样品中,Se的固溶使得Se(Te)_(2)+SbBi的缺陷形成能更低,抑制了反位缺陷Sb_(Te)_(2)的产生,Bi_(1.8)Sb_(0.2)Te_(2.694)Se_(0.30)Cl_(0.006)样品的少数载流子空穴浓度降至1.49×10^(16)cm^(-3),消除了其对材料热电性能的劣化效果,显著地提升了材料的功率因子,室温下达到4.49 mW/(m·K^(2)).结合Sb和Se固溶增强合金化散射降低材料的热导率,Bi_(1.8)Sb_(0.2)Te_(2.844)Se_(0.15)Cl_(0.006)样品在室温下获得最大ZT值为0.98.该研究为调控具有复杂成分的Bi_(2)Te_(3)基材料的点缺陷、载流子浓度和热电性能提供了重要的指导. 展开更多
关键词 Bi2te3基化合物 缺陷工程 热电性能
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Te基热电器件反常界面层生长行为及界面稳定性研究
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作者 苗鑫 闫世强 +3 位作者 韦金豆 吴超 樊文浩 陈少平 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2024年第8期903-910,I0004-I0007,共12页
单质Te具有优异的热电优值(ZT),但其与金属电极连接界面处的剧烈元素交互扩散及反应会引入较大的接触电阻率(ρc),导致器件的转换效率(η)较低。因此,寻找合适的阻挡层来优化Te与金属电极间的连接至关重要。本研究基于梯度结构报道了一... 单质Te具有优异的热电优值(ZT),但其与金属电极连接界面处的剧烈元素交互扩散及反应会引入较大的接触电阻率(ρc),导致器件的转换效率(η)较低。因此,寻找合适的阻挡层来优化Te与金属电极间的连接至关重要。本研究基于梯度结构报道了一种宽相场Ni-Te合金阻挡层NiTe_(2-m)(NixTe(x=0.500~0.908))。结果表明,当x=0.500时,Ni_(0.5)Te/Te_(0.985)Sb_(0.015)/Ni_(0.5)Te器件的界面处无任何反应层及微观缺陷,ρ_(c)小于10μΩ·cm^(2),η在180K温差(热端温度473K)时达到了理论值的75%。同时,界面具有良好的热稳定性,在473K老化期间,界面微观组织、ρ_(c)以及η无明显变化。当x>0.500时,界面反应层厚度随x增大而逐渐减小,即主导界面反应层生长行为的因素并非常规的界面反应能及浓度梯度等热力学因素。进一步分析表明,反常生长源于动力学因素中的“原子空位”对反应层生成的迟滞作用。 展开更多
关键词 te 热电器件 扩散动力学 阻挡层 热稳定性
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The Effect of Trihalomethanes in Contaminating the Major Watersheds of Middle Tennessee
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作者 Sujata Guha Paige Harlin Ryan Beni 《Natural Science》 2019年第7期233-245,共13页
We have analyzed the contamination of the three major watersheds in Middle Tennessee (Middle Cumberland River Watershed, Stones River Watershed, and Harpeth River Watershed) by trihalomethanes, such as chloroform, bro... We have analyzed the contamination of the three major watersheds in Middle Tennessee (Middle Cumberland River Watershed, Stones River Watershed, and Harpeth River Watershed) by trihalomethanes, such as chloroform, bromodichloromethane, dibromochloromethane, and bromoform. These chemicals play an important role in the develop-ment of cancer and adverse reproductive outcomes, and were found to be present above the threshold established by the Environmental Protection Agency. Certain portions of each watershed were found to be contaminated by the trihalomethanes, and deemed un-healthy. The household incomes in the major areas in the three watershed regions were also examined to determine a possible relationship with the level of water contamination. We concluded that income did not necessarily relate to water quality. Specific areas within each watershed that had lower average household incomes were found to have a higher concentration of the trihalomethanes in their drinking water, while other high-income areas were also affected by unhealthy water. However, these effects were random, and the level of contamination remained below the guidelines regulated by the State of Tennessee. 展开更多
关键词 MIDDLE tennessee Watersheds TRIHALOMETHANES CONTAMINANTS CARCINOGENS
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Vitamin D Deficiency and Insufficiency in Northeast Tennessee
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作者 Arun Joseph Kattakayam Donovan Reed +4 位作者 Sajin M. Karakattu Beth Bailey Millard Ray Lamb Paul O. Lewis Dima Youssef 《Health》 2020年第9期1085-1094,共10页
<strong>Background:</strong> The role of vitamin D in population subgroups throughout the world continues to be a topic of interest among researchers. Current evidence demonstrates that treating vitamin D ... <strong>Background:</strong> The role of vitamin D in population subgroups throughout the world continues to be a topic of interest among researchers. Current evidence demonstrates that treating vitamin D deficiency plays a significant role in improving mortality in hospitalized patients, reducing hospital length of stay, and boosting innate immune system. Vitamin D levels vary with age, gender, body mass index (BMI) and geographical area. The purpose of this study is to evaluate vitamin D levels in a cohort of patients in Northeast Tennessee. <strong>Study: </strong>This institutional review board-approved, retrospective study evaluated vitamin D levels of patients obtained from Mcleod Cancer and Blood Center. Vitamin D levels were collected over a 2-year period and classified as deficient (<20 ng/mL), insufficient (20 - 30 ng/mL), or replete (>30 ng/mL). Data were then stratified based on patient characteristics (age, gender, body mass index (BMI), race, seasons, and place of residence) and compounds of vitamin D (D2 and D3).<strong> Results:</strong> There were 2011 individuals included, with only 44.3% having replete levels and 21.4% with levels less than 20 ng/mL. Females with vitamin D deficiency are more likely to have levels below 20 ng/ml compared to males (18.6% vs. 23%, respectively, p = 0.003). Regarding BMI, the highest levels were reported in normal weight and overweight. With regards to age, advanced age (≥70) was associated with the highest levels and most replete patients. Winter months were associated with the lowest levels of vitamin D. Higher vitamin D levels were found in individuals over 70 years, normal weight and overweight category. <strong>Conclusion:</strong> Testing vitamin D levels in high-risk groups becomes of utmost importance in areas with longer winter months, obese and underweight patients. Vitamin D levels should be routinely tested and treated in vulnerable populations. 展开更多
关键词 Vitamin D Vitamin D Deficiency Vitamin D Insufficiency Northeast tennessee
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胶质母细胞瘤中癌-睾丸抗原OY-TES-1的表达对M2型巨噬细胞极化的影响
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作者 赵振凯 梁国 +4 位作者 李枫 农蔚霞 张庆梅 罗彬 谢小薰 《中国临床新医学》 2024年第8期875-880,共6页
目的探讨胶质母细胞瘤(GBM)中癌-睾丸抗原OY-TES-1的表达对M2型巨噬细胞极化的影响。方法体外培养人GBM细胞U251与人外周血单核细胞THP-1,构建稳定下调OY-TES-1的U251稳转株(U251-SH-OY-TES-1组),将转染无关序列的U251作为对照(U251-SH... 目的探讨胶质母细胞瘤(GBM)中癌-睾丸抗原OY-TES-1的表达对M2型巨噬细胞极化的影响。方法体外培养人GBM细胞U251与人外周血单核细胞THP-1,构建稳定下调OY-TES-1的U251稳转株(U251-SH-OY-TES-1组),将转染无关序列的U251作为对照(U251-SH-NC组)。48h后取两组上清液与THP-1细胞共培养,加入U251-SH-NC组上清液的THP-1细胞为SH-NC组,加入U251-SH-OY-TES-1组上清液的THP-1细胞为SH-OY-TES-1组。通过实时荧光定量聚合酶链反应(RT-qPCR)和蛋白免疫印迹法分别检测两组OY-TES-1mRNA和蛋白相对表达量,确定转染效率。通过酶联免疫吸附试验(ELISA)检测培养液中人白细胞介素-10(IL-10)、人转化生长因子-β(TGF-β)表达水平。通过流式细胞术检测CD206表达水平。结果RT-qPCR与蛋白免疫印迹法检测结果显示,U251-SH-OY-TES-1组OY-TES-1mRNA和蛋白的相对表达量低于U251-SH-NC组,差异有统计学意义(P<0.05)。ELISA结果显示,两组培养液中TGF-β、IL-10水平随培养时间的增加呈上升趋势。第0天、第2天SH-OY-TES-1组培养液中TGF-β水平显著低于SH-NC组(P<0.05),IL-10水平比较差异无统计学意义(P>0.05)。第4天SH-OY-TES-1组培养液中TGF-β、IL-10水平显著低于SH-NC组(P<0.05)。流式细胞术结果显示,与SH-NC组比较,SH-OY-TES-1组CD206水平下降,差异有统计学意义(P<0.05)。结论GBM中OY-TES-1高表达能够促进M2型巨噬细胞的极化。 展开更多
关键词 胶质母细胞瘤 OY-teS-1 M2型巨噬细胞 极化
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近化学计量比的HgCdTe薄膜表面处理方法
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作者 王嘉龙 刘艳珍 +3 位作者 杨晓坤 黄福云 杨超伟 李雄军 《红外技术》 CSCD 北大核心 2024年第6期646-653,共8页
本文采用X射线光电子能谱检测技术分别对溴-甲醇(Br_(2):Me)、溴-氢溴酸(Br_(2):HBr)和溴-氢溴酸-乙二醇(Br_(2):HBr:Eg)3种体系的腐蚀液处理后的HgCdTe表面状态进行了研究,结果表明这3种溴基腐蚀液均会造成HgCdTe表面富碲(Te^(0)),且... 本文采用X射线光电子能谱检测技术分别对溴-甲醇(Br_(2):Me)、溴-氢溴酸(Br_(2):HBr)和溴-氢溴酸-乙二醇(Br_(2):HBr:Eg)3种体系的腐蚀液处理后的HgCdTe表面状态进行了研究,结果表明这3种溴基腐蚀液均会造成HgCdTe表面富碲(Te^(0)),且富碲程度为(Br_(2):HBr:Eg)<(Br_(2):HBr)<(Br_(2):Me)。为了获得接近化学计量比的表面,一般采取先氧化富碲为TeO_(2)后腐蚀的方式去除表面富碲,然而,湿法腐蚀去除表面富碲的方法存在各种缺点。等离子体氧化具有氧化性强,工艺稳定,安全环保等优点,因此本文通过氧等离子体氧化Br_(2):HBr:Eg处理后的HgCdTe表面,进一步研究了盐酸、乳酸和氢氧化铵溶液腐蚀去除HgCdTe表面氧化物的情况,结果表明低浓度的盐酸能够较彻底地去除HgCdTe表面氧化物且不引入碳等其他污染物。在此接近化学计量比的表面制备的CdTe钝化膜与HgCdTe界面孔洞大小及数量显著减小,说明CdTe/HgCdTe界面的缺陷密度更低。 展开更多
关键词 碲镉汞 表面处理 富碲 等离子体氧化 近化学计量比
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On Escapism in Tennessee Williams' s The Glass Menagerie
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作者 孔鲁晓 王莉 赵建平 《海外英语》 2015年第18期135-136,共2页
Wingfiled’s family is trapped in the cage in Tennessee Williams’s The Glass Menagerie.They want to free their bundles and each of them has taken a different way.This paper considers the theme of escapism by analyzin... Wingfiled’s family is trapped in the cage in Tennessee Williams’s The Glass Menagerie.They want to free their bundles and each of them has taken a different way.This paper considers the theme of escapism by analyzing characters’spiritual world and their existential predicaments.The significance of their own way is explored since they add layers of meaning to the central argument:escapism.Tennessee Williams; 展开更多
关键词 tennessee WILLIAMS The GLASS Menagerie escapism
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微量Te对Cu-Cr-Zr合金组织及性能的影响
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作者 邓立勋 龚留奎 +5 位作者 尹飞 黄滢秋 张延松 陈子明 黄伟 张保元 《热加工工艺》 北大核心 2024年第8期128-134,共7页
采用SEM、EDS等微观表征以及显微硬度和导电性能检测手段,研究了Te含量对Cu-Cr-Zr-Te合金铸态组织及性能的影响。结果表明:随着Te含量的增加,铸态Cu-Cr-Zr-Te合金的硬度呈逐渐升高的的趋势,但导电性能基本趋于稳定状态,热锻处理后合金... 采用SEM、EDS等微观表征以及显微硬度和导电性能检测手段,研究了Te含量对Cu-Cr-Zr-Te合金铸态组织及性能的影响。结果表明:随着Te含量的增加,铸态Cu-Cr-Zr-Te合金的硬度呈逐渐升高的的趋势,但导电性能基本趋于稳定状态,热锻处理后合金的硬度和导电率都有所上升。铸态Cu-Cr-Zr-Te合金中低含量Te与Zr结合力较强易形成CuZrTe化合物,提升Te含量倾向于形成CuCrTe化合物;合金经900℃/4h的保温、热锻处理后,CuCrTe化合物分解为富Te相和富Cr相造成基体中Te元素的贫化,导致元素Te与元素Cr的相对比例减小而形成CuZrTe化合物。 展开更多
关键词 Cu-Cr-Zr-te 硬度 CuZrte化合物 CuCrte化合物 富Cr相
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The Awakening Women in Tennessee Williams' s Plays
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作者 马云飞 《海外英语》 2015年第4期205-206,208,共3页
Tennessee Williams is a great American playwright. The heroines in the three plays experienced the changes of times.There are also some common threads that weave their way through these women's lives. They are dif... Tennessee Williams is a great American playwright. The heroines in the three plays experienced the changes of times.There are also some common threads that weave their way through these women's lives. They are different from the passive women characters in Williams' s early plays. The growth of women is an important part in the development of society. Through the research on the three plays, the causes, the procedure and the significance of their final awakening can be found. 展开更多
关键词 tennessee WILLIAMS women’s AWAKENING The ROSE TATTOO Cat on a Hot Tin Roof Orpheus DESCENDING
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Memphis, Tennessee: A Metonym for Rock 'n Roll, the Child of the Blues
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作者 Harry Sewlall 《Journal of Literature and Art Studies》 2011年第3期173-189,共17页
The 1991 Booker Prize--winning novelist Ben Okri, while traveling in the Deep South after Barack Obama's victory in the November 2008 presidential election, wrote that Elvis Presley was a lingering deity in the city ... The 1991 Booker Prize--winning novelist Ben Okri, while traveling in the Deep South after Barack Obama's victory in the November 2008 presidential election, wrote that Elvis Presley was a lingering deity in the city of Memphis. The images of Elvis Presley, who earned the sobriquet "King of Rock" early in his career, and that of B. B. King, the exemplar extraordinaire of the Blues, are ubiquitous in the city of Memphis, which may be regarded as a metonym for the Blues and Rock 'n Roll. The byline for the city of Memphis is, "Home of the Blues, Birthplace of Rock 'n Roll", and this fact announces itself to the visitor as soon as he/she enters the arrivals concourse of the Memphis International Airport. As one proceeds towards the baggage claims area, the images which saturate the walkway create an aura that is redolent of the city's vibrant Rock 'n Roll era. Drawing on Foucault's notion of heterotopias, as well as Jakobson's work on metonymy, this paper explores the hybrid musical spatiality of the city of Memphis and its environs, as well as its iconic status in the evolution of Rock 'n Roll which was engendered by the Blues. 展开更多
关键词 Memphis tennessee metonym Rock 'n Roll BLUES HEteROTOPIA Elvis B. B. King
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长城沿线县域TES系统耦合协调性时空格局与空间效应
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作者 白翠玲 雷欣 +1 位作者 杨丽花 董志良 《生态经济》 北大核心 2024年第5期146-153,共8页
基于2015—2019年河北省长城沿线59个县域的面板数据,采用综合评价指标、耦合协调度模型和空间面板模型等方法,探索河北省长城沿线县域旅游产业、生态环境与社会效益三大子系统(TES)耦合协调性时空发展格局与空间效应。研究发现:(1)河... 基于2015—2019年河北省长城沿线59个县域的面板数据,采用综合评价指标、耦合协调度模型和空间面板模型等方法,探索河北省长城沿线县域旅游产业、生态环境与社会效益三大子系统(TES)耦合协调性时空发展格局与空间效应。研究发现:(1)河北省长城沿线县域TES系统综合发展水平呈现波动上升态势,其中社会效益子系统和旅游产业子系统发展水平总体上呈现缓慢上升趋势,生态环境子系统的增长趋势不显著,且社会效益子系统>旅游产业子系统>生态环境子系统。(2)TES系统呈现高耦合低协调的特征,耦合协调水平整体上呈现良好的增长趋势,且地域分布格局呈现东北部>南部>中部>西北部的态势。(3)人口密度、经济发展水平、对外开放程度、技术创新和产业结构是影响TES系统耦合协调水平的重要因素,人口密度和产业结构会对邻近县域的TES系统耦合协调水平产生影响。基于以上结果提出相应的建议,为促进长城沿线县域TES系统协调发展提供科学依据。 展开更多
关键词 teS系统 耦合协调模型 空间效应 长城沿线县域
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六角GaM(M=S/Se/Te)的电子结构和力学性质的第一性原理计算
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作者 路羽茜 张鑫 李世娜 《功能材料》 CAS CSCD 北大核心 2024年第5期5134-5140,共7页
依据密度泛函理论(DFT)对层状六角P63/mmc结构的GaM(M=S/Se/Te)进行电子结构与弹性力学特性的模拟研究。优化后的P63/mmc-GaM(M=S/Se/Te)的晶格,与实验结果相吻合。采用HSE06泛函得到的带隙值比PBE得到的与实验值更接近。应变能-应变(E... 依据密度泛函理论(DFT)对层状六角P63/mmc结构的GaM(M=S/Se/Te)进行电子结构与弹性力学特性的模拟研究。优化后的P63/mmc-GaM(M=S/Se/Te)的晶格,与实验结果相吻合。采用HSE06泛函得到的带隙值比PBE得到的与实验值更接近。应变能-应变(E-S)和应力-应变(S-S)两种方法得到的P63/mmc-GaM(M=S/Se/Te)的单晶弹性常数都符合弹性力学稳定性准则。在更接近文献值的应力-应变(S-S)法基础上,对3种材料的多晶弹性模量等力学特性进行了后续分析。泊松比和B/G值表明,P63/mmc-GaM(M=S/Se/Te)显现出脆性。各向异性因子、杨氏模量E、剪切模量G及线性压缩系数β的三维立体图分别展示了材料的弹性各向异性程度。在零温零压下,P63/mmc-GaM(M=S/Se/Te)在[100]方向上的第一横向声速最大,在[001]方向上两个横波TA1和TA2的速度最慢。 展开更多
关键词 密度泛函理论 六角P63/mmc-GaM(M=S/Se/te) 电子结构 力学性质 各向异性
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基于元学习的小样本多模态TE过程故障诊断
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作者 杨青 华春丽 +2 位作者 朱美臣 吴东升 王笑臣 《沈阳理工大学学报》 CAS 2024年第2期52-57,共6页
为解决多模态TE过程在小样本条件下故障诊断精度低的问题,提出了一种基于深度最近邻神经网络(DN4)与压缩和激励(SE)模块结合的集合型故障诊断方法(SEDN4)。首先,使用小波包变换将多模态过程数据转换成二维图像,划分元学习任务;然后,由... 为解决多模态TE过程在小样本条件下故障诊断精度低的问题,提出了一种基于深度最近邻神经网络(DN4)与压缩和激励(SE)模块结合的集合型故障诊断方法(SEDN4)。首先,使用小波包变换将多模态过程数据转换成二维图像,划分元学习任务;然后,由嵌入网络进行局部特征提取,获得局部特征描述符;最后,使用k近邻搜索得到预测值。当新模态产生时,基于已有模型设计经验,在小样本条件下可快速得到新模态故障诊断模型。实验结果表明,本文方法在小样本条件下能够较好地实现多模态故障诊断,提高了故障诊断准确率,诊断效果较好。 展开更多
关键词 多模态te过程 故障诊断 小样本学习 元学习
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Frictional contact analysis of a rigid solid with periodic surface sliding on the thermoelectric material
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作者 Yali ZHANG Yueting ZHOU Shenghu DING 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第1期179-196,共18页
Understanding and characterizing rough contact and wavy surfaces are essential for developing effective strategies to mitigate wear,optimize lubrication,and enhance the overall performance and durability of mechanical... Understanding and characterizing rough contact and wavy surfaces are essential for developing effective strategies to mitigate wear,optimize lubrication,and enhance the overall performance and durability of mechanical systems.The sliding friction contact problem between a thermoelectric(TE)half-plane and a rigid solid with a periodic wavy surface is the focus of this investigation.To simplify the problem,we utilize mixed boundary conditions,leading to a set of singular integral equations(SIEs)with the Hilbert kernels.The analytical solutions for the energy flux and electric current density are obtained by the variable transform method in the context of the electric and temperature field.The contact problem for the elastic field is transformed into the second-kind SIE and solved by the Jacobi polynomials.Notably,the smoothness of the wavy contact surface ensures that there are no singularities in the surface contact stress,and ensures that it remains free at the contact edge.Based on the plane strain theory of elasticity,the analysis primarily examines the correlation between the applied load and the effective contact area.The distribution of the normal stress on the surface with or without TE loads is discussed in detail for various friction coefficients.Furthermore,the obtained results indicate that the in-plane stress decreases behind the trailing edge,while it increases ahead of the trailing edge when subjected to TE loads. 展开更多
关键词 wavy surface periodic contact thermoelectric(te)material Hilbert integral kernel
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