检索结果-南通市图书馆

Design strategy and relevant flow mechanisms of highly loaded 3D compressor tandem cascades

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

Chinese Journal of Aeronautics 2024年第7期37卷 220-235页

作者： Xiaochen MAO yunyu wang Zhihua DING Hao CHENG Bo LIU School of Power and Energy Northwestern Polytechnical UniversityXi’an 710129China The National Key Laboratory of Science and Technology on Aerodynamic Design and Research Xi’an 710129China Xi’an Thermal Power Research Institute Co.Ltd Xi’an 710072China

To investigate the design strategy of highly loaded tandem cascades at both the midspan and endwall,the overall performance and flow mechanisms of four typical tandem cascades based on the optimization were analyzed from multiple perspectives *** results show that the interference effects on the Front Blade(FB)and Rear Blade(RB)should not be overlooked during the design phase,and the design strategies at the midspan and endwall are completely *** the midspan,the optimization aims to increase the interference effects and the strength of the gap jet while maintaining the same load on the FB and ***,the endwall optimal airfoil exhibits weakening interference effects,advancement of the gap jet location,and load transfer from the FB to *** further analysis of flow characteristics,the midspan optimal airfoil is beneficial for inhibiting the low-energy fluid from interacting with the suction surface of RB under the design condition,but results in earlier occurrence of corner *** endwall optimal airfoil helps suppress the development of the secondary flow and delay the onset of corner ***,by combining the benefits of these two design approaches,additional forward sweep effects are achieved,further enhancing the performance of the tandem cascade.

关键词： Tandem cascade Interference effect Vortex structure Load split Compressor

术前穿刺活检及术中冰冻病理技术用于乳腺导管原位癌伴微浸润诊断的价值

在线全文

学校读者我要写书评

暂无评论

黑龙江医学 2024年第2期48卷 152-155页

作者：陈莎莎王允玉龙岩市第二医院病理科福建龙岩364000

目的:探讨术前穿刺活检及术中冰冻病理技术用于乳腺导管原位癌伴微浸润的诊断价值,并分析疾病特征。方法:选取2021年2月—2022年2月龙岩市第二医院62例乳腺导管原位癌患者,所有患者均行术前穿刺活检和术中冰冻病理检查,以术后病理结果... 详细信息

目的:探讨术前穿刺活检及术中冰冻病理技术用于乳腺导管原位癌伴微浸润的诊断价值,并分析疾病特征。方法:选取2021年2月—2022年2月龙岩市第二医院62例乳腺导管原位癌患者,所有患者均行术前穿刺活检和术中冰冻病理检查,以术后病理结果为诊断金标准,对比两种方式诊断效能,并比较两种疾病临床特点和肿瘤浸润淋巴细胞分布状态。结果:术后病理学研究结果显示,62例患者中,38例为单纯乳腺导管原位癌患者,24例为乳腺导管原位癌伴微浸润患者;术前穿刺活检诊断敏感性为91.67%、特异性为84.21%、准确性为87.10%、阳性预测值为78.57%、阴性预测值为94.12%,高于术中冰冻病理的58.33%、55.26%、56.45%、45.16%和54.74%,差异有统计学意义(χ^(2)=7.111、7.544、14.370、6.904、7.494,P<0.05);乳腺导管原位癌伴微浸润病灶直径为(3.21±0.54)cm,可触及肿块概率为95.83%,增殖细胞抗原(ki67)高表达概率为66.67%,高分化概率为70.83%,高于乳腺导管原位癌;孕激素受体阳性率为17.86%,雌激素受体阳性率为29.17%,低于乳腺导管原位癌,差异有统计学意义(t=4.948,χ^(2)=4.439、4.876,P<0.05)。结论:与术中冰冻病理比较,术前穿刺活检乳腺导管原位癌伴微浸润准确性高;乳腺导管原位癌伴浸润和乳腺导管原位癌临床特征和肿瘤浸润淋巴细胞分布状态各不相同,可为疾病鉴别诊断提供依据。

关键词：术前穿刺活检术中冰冻病理乳腺导管原位癌伴微浸润诊断效能临床特征肿瘤浸润淋巴细胞

Topology optimization of simplified convective heat transfer problems using the finite volume method

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第5期66卷 1352-1364页

作者： YAN Kun wang yunyu PAN Yu SUN Guo CHEN Jian CAI XianHui CHENG GengDong School of Chemical Machinery and Safety Dalian University of TechnologyDalian116024China Science and Technology on Scramjet Laboratory National University of Defense TechnologyChangsha410073China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian116024China

Topology optimization of simplified convective heat transfer has been widely studied,but most existing studies are based on the finite element method(FEM);methods based on the finite volume method(FVM)have been less *** this paper,a topology optimization method based on FVM was proposed for a simplified convective heat transfer *** developed a novel adjoint sensitivity analysis method applicable to FVM,which included adjoint equations,corresponding boundary conditions,and sensitivity analysis ***,a program for the proposed topology optimization method was developed in open field operation and manipulation(OpenFOAM)and portable,extensibletoolkit for scientific computation(PETSc).Thus,large-scale topology optimizations could be performed in ***,numerical examples of the classical two-dimensional(2D)and 3D optimization problems were *** results verified the effectiveness and feasibility of the proposed *** results of large-scale 3D examples show an interesting phenomenon that for the optimized designs with few features,the large-scale topology optimization is still valuable for obtaining more effective structural shapes.

关键词： simplified convective heat transfer topology optimization large scale adjoint sensitivity analysis OpenFOAM

基于MODIS和CLDAS的综合干旱监测模型研究

在线全文

学校读者我要写书评

暂无评论

南京信息工程大学学报 2024年第3期16卷 394-404页

作者：邢雅洁沈润平黄安奇梁宇靖王云宇谢昭颖师春香孙帅南京信息工程大学地理科学学院南京210044 国家气象信息中心北京100081

传统的干旱监测指数主要考虑单一影响因子,往往无法全面综合反映干旱状况.基于MODIS数据和CLDAS数据,选取多个影响因子和能够直接反映干旱程度的干旱指数作为自变量,以综合气象干旱指数(CI)为因变量,通过梯度提升机(GBM)机器学习算法建... 详细信息

传统的干旱监测指数主要考虑单一影响因子,往往无法全面综合反映干旱状况.基于MODIS数据和CLDAS数据,选取多个影响因子和能够直接反映干旱程度的干旱指数作为自变量,以综合气象干旱指数(CI)为因变量,通过梯度提升机(GBM)机器学习算法建立日尺度综合干旱监测模型,并以2015—2018年华北地区干旱为例进行了研究.结果表明模型监测结果与站点CI计算值具有显著的相关性,训练集和测试集决定系数分别达到0.945和0.655,均方根误差(RMSE)分别为0.033和0.082,综合干旱监测模型具有较高的精度.且模型监测与CI监测各月等级一致率均在65%以上,并与标准化降水蒸散指数(SPEI)和土壤相对湿度(RSM)相关系数分别为0.68和0.60,能较好地反映气象干旱和农业干旱状况.典型干旱情况监测表明,综合干旱监测模型综合考虑多种干旱影响因素,能较准确地识别出干旱的发生,表征综合干旱发生状况.

关键词： CLDAS 综合干旱监测梯度提升机 MODIS

DNA barcoding reveals commercial fraud related to yak jerky sold in China

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2016年第1期59卷 106-108页

作者： yunyu wang Kai He Long Fan Yushui wang Shifang Wu Robert W Murphy Wenzhi wang Yaping Zhang State Key Laboratory of Genetic Resources and Evolution and Yunnan Laboratory of Molecular Biology of Domestic Animals Kunming In-stitute of ZoologyChinese Academy of SciencesKunming 650223China Key Laboratory of Animal Models and Human Disease Mechanisms Kunming Institute of ZoologyChinese Academy of SciencesKunming 650223China Forensic Science Service of Yunnan Endangered Species Scientific Commission Kunming 650223China Centre for Biodiversity and Conservation Biology Royal Ontario MuseumToronto M5S 2C6Canada Guizhou Academy of Testing and Analysis Guiyang 550002China Laboratory for Conservation and Utilization of Bio-resource and Key Laboratory for Microbial Resources of the Ministry of Education Yunnan UniversityKunming 650091China

Dear Editor, Instances of food mislabeling and adulteration scandals fo- cus public attention on food safety and market fraud. Such scandals force the authorities to enforce stringent regula- tions on food adulteration. The Chinese government and consumers are paying more attention to food resource qual- ity and safety regulation than ever before. The growing food market requires food authenticity at all stages of product processing, while species identification of raw materials is fundamental for food safety. Species substitution causes economical loss to consumers and may negatively affect public sanitation because of possible presence of toxic and parasite-infected species （Galimberti et al., 2013）.

关键词：商业欺诈中国政府条形码技术牦牛肉干 DNA 食品安全销售物种鉴定

Meta-Transcriptome Profiling of Novel Invasive Pest Spodoptera frugiperda in Yunnan,China

在线全文

学校读者我要写书评

暂无评论

Virologica Sinica 2020年第2期35卷 240-244页

作者： Junming Shi Weiwei Li yunyu wang Quanyan Chen Fei Deng State Key Laboratory of Virology and National Viruses Resource Center Wuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China Kunming Institute of Zoology Chinese Academy SciencesKunming 650223China Yunnan Agricultural University Kunming 650201China

Dear Editor,The fall army worm,Spodoptera frugiperda(Lepidoptera:Noctuidae),a highly agricultural destructive pest of cereals,is originally rampant in tropical and subtropical America(Kenis et al.2019).The caterpillars of this moth feed on more than 350 plant species(Harrison et al.2019),including several economically important cultivated grasses such as maize,rice,sorghum and sugarcane,severely threatening the food security(Cock et al.2017).Spodoptera frugiperda is recognized to comprise two morphologically identical but genetically distinct strains with different host ***"rice strain^R strain,RS)is thought to preferentially feed on rice and various pasture grasses,while the‘com strain,(C strain,CS)on maize,cotton and sorghum(Juarez et al.2012).Unable to tolerate freezing temperature,*** is seldom reported outside of ***,since its first detection in Nigeria in 2016,several congruent reports from African countries about sudden and severe upsurges of *** raised the alarm that *** is continuously expanding their range to become truly threat(Goergen et al.2016).

关键词： freezing maize truly

Steam reforming of acetic acid over Ni/biochar of low metal-loading:Involvement of biochar in tailoring reaction intermediates renders superior catalytic performance

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第4期68卷 241-252页

作者： yunyu Guo Yiran wang Shu Zhang Yi wang Song Hu Jun Xiang Walid Nabgan Xun Hu School of Material Science and Engineering University of JinanJinan 250022China Joint International Research Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China Departament d'Enginyeria Química Universitat Rovira i VirgiliTarragona 43007Spain

Biochar is a reactive carrier as it may be partially gasified with steam in steam reforming,which could influence the formation of reaction intermediates and modify catalytic ***,the Ni/biochar as well as two comparative catalysts,Ni/Al_(2)O_(3) and Ni/SiO_(2),with low nickel loading(2%(mass))was conducted to probe involvement of the varied carriers in the steam *** results indicated that the Ni/biochar performed excellent catalytic activity than Ni/SiO_(2) and Ni/Al_(2)O_(3),as the biochar carrier facilitated quick conversion of the -OH from dissociation of steam to gasify the oxygen-rich carbonaceous intermediates like C=O and C-O-C,resulting in low coverage while high exposure of nickel species for maintaining the superior catalytic *** converse,strong adsorption of aliphatic intermediates over Ni/Al_(2)O_(3) and Ni/SiO_(2) induced serious coking with polymeric coke as the main type(21.5%and 32.1%,respectively),which was significantly higher than that over Ni/biochar(3.9%).The coke over Ni/biochar was mainly aromatic or catalytic type with nanotube morphology and high *** high resistivity of Ni/biochar towards coking was due to the balance between formation of coke and gasification of coke and partially biochar with steam,which created developed mesopores in spent Ni/biochar while the coke blocked pores in Ni/Al_(2)O_(3) and Ni/SiO_(2) catalysts.

关键词： Steam reforming Acetic acid Ni/biochar catalyst Property of coke Reaction intermediates

Mg-Al-hydrotalcite with alkaline sites protects Ni/KIT-6 from formation of amorphous coke in glycerol steam reforming via tailoring reaction intermediates

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第4期18卷 25-39页

作者： yunyu Guo Yiran wang Yuewen Shao Shu Zhang Yi wang Song Hu Jun Xiang Xun Hu School of Material Science and Engineering University of JinanJinan 250022China Joint International Research Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

During steam reforming,the performance of a catalyst and amount/property of coke are closely related to reaction intermediates reaching surface of a ***,modification of reaction intermediates by placing Mg-Al-hydrotalcite above Ni/KIT-6 catalyst in steam reforming of glycerol was conducted at 300 to 600°*** results revealed that the catalytic activity of Ni/KIT-6 in the lower bed was enhanced with either Mg1-Al5-hydrotalcite(containing more acidic sites)or Mg5-Al1-hydrotalcite(containing more alkaline sites)as upper-layer *** in situ infrared characterization of steam reforming demonstrated that Mg-Al-hydrotalcite catalyzed the deoxygenation of glycerol,facilitating the reforming of the partially deoxygenated intermediates over Ni/***-Al-hydrotalcite as protective catalyst,however,did not protect the Ni/KIT-6 from formation of more ***,this did not lead to further deactivation of Ni/KIT-6 while Mg5-Al1-hydrotalcite even substantially enhanced the catalytic stability,even though the coke was much more significant than that in the use of single Ni/KIT-6(52.7%vs.28.6%).The reason beneath this was change of the property of coke from more aliphatic to more ***5-Al1-hydrotalcite catalyzed dehydration of glycerol,producing dominantly reaction intermediates bearing C=C,which formed the catalytic coke of with carbon nanotube as the main form with smooth outer walls as well as higher aromaticity,C/H ratio,crystallinity,crystal carbon size,thermal stability,and resistivity toward oxidation on Ni/KIT-6 in the lower *** comparison,the abundance of acidic sites on Mg1-Al5-hydrotalcite catalyzed the formation of more oxygen-containing species,leading to the formation of carbon nanotubes of rough surface on Ni/KIT-6.

关键词： steam reforming of glycerol Mg-Alhydrotalcite sacrificial catalyst reaction intermediates property of coke

结核分枝杆菌利福平和异烟肼耐药突变的快速分子诊断方法构建

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

中国煤炭工业医学杂志 2024年第2期27卷 212-219页

作者：金聪王宇翔吴于婷王云宇李亚奇钱庆增胖铁良陈江坡华北理工大学公共卫生学院河北省唐山市063210 河北省职业卫生与安全协同创新中心廊坊诺道中科医学检验实验室有限公司

目的采用快速分子诊断方法中TaqMan荧光定量PCR技术,应用于利福平和异烟肼一线抗结核药物耐药基因的诊断中,评价其性能,建立高灵敏度、高特异度、高准确性并且快速的筛查方法,为结核分枝杆菌耐药性的诊断和治疗提供依据并探讨其应用价... 详细信息

目的采用快速分子诊断方法中TaqMan荧光定量PCR技术,应用于利福平和异烟肼一线抗结核药物耐药基因的诊断中,评价其性能,建立高灵敏度、高特异度、高准确性并且快速的筛查方法,为结核分枝杆菌耐药性的诊断和治疗提供依据并探讨其应用价值,努力改善耐药结核病的检测和可行性。方法本研究针对利福平ropB基因531位点突变和异烟肼katG基因315位点突变的特点,设计TaqMan-MGB引物和探针,通过反应条件优化,建立TaqMan荧光定量PCR方法;用克隆到pUC57载体上的阳性标准品及不同菌株评价该方法的特异性、灵敏度、重复性和精密度,采用甘油三酯、胆红素和血红素进行了干扰性实验。结果 TaqMan荧光定量PCR方法的检测限可达10copies/μl;在交叉干扰实验中,检测了5种常见呼吸道感染细菌国家标准菌株,均未检出,基因野生型和突变型探针特异性较好,不受其它基因干扰;批内、批间的CT值变异系数均小于5%,标准曲线R2=0.998,扩增效率均在90%以上;该反应迅速,检测时间为1h。结论本研究建立的TaqMan荧光定量PCR方法有助于及时发现结核分枝杆菌耐药情况,对结核病的耐药检测与后续治疗具有重要意义。

关键词：结核分枝杆菌 katG ropB 快速分子诊断 TaqMan荧光定量PCR