检索结果-南通市图书馆

Asymmetric Ni/PVC Films for High-performance Electromagnetic Interference Shielding

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 Polymer Science 2015年第6期33卷 899-907页

作者：张扬 xiao-xia Fang 温变英 Department of Material Science and Engineering Beijing Technology and Business University

A novel asymmetric Ni/PVC film has been developed by solution casting method. The structure, electrical conductivity, electromagnetic interference （EMI） shielding, and impact resistance were investigated. The results showed that the Ni particles were asymmetrically distributed along the thickness direction in the film. The top surface resistivity increased with film thickness, while the bottom surface exhibited the different trend. EMI shielding effectiveness （SE） depended on formation of closed packed conductive Ni network, which was influenced by both Ni content and film thickness. A linear relationship was observed between EMI SE and film thickness. The films with lower Ni content showed the faster increasing rate of EMI SE with film thickness. Some of the films show appreciably high EMI SE （〉 40 dB）, indicating the promising application in EMI shielding field. Moreover, the films exhibit different impact performance under different impacting directions. All the experimental facts demonstrate that the asymmetric structure endows the film achieving high-performance EMI shielding function.

关键词： Asymmetric structure Electrical conductivity Electromagnetic interference shielding.

HETEROAROMATIC POLYMERS—HIGH TEMPERATURE POLYPYRROLONES DERIVED FROM 2,6-BIS(3',4'-DIAMINOPHENYL)-4-BIPHENYLPYRIDINE AND VARIOUS AROMATIC DIANHYDRIDES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2005年第5期23卷 521-529页

作者： Hai-xia yang Jin-gang Liu xiao-juan Zhao Yan-feng Li Lin Fan Shi-yong yang School of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China Laboratory of Advanced Polymer Materials Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

A new type of aromatic tetraarnine containing biphenyl moiety in the side chain was synthesized via a modified Chichibabin＇s reaction. 3-Nitro-4-acetamidoacetophenone was reacted with 4-phenyl benzaldehyde in the presence of ammonium acetate to obtain 2,6-bis（3＇,4＇-diaminophenyl）-4-biphenyl pyridine （DPPA）. A series of polypyrrolones （PPys） were prepared using tetraamine and various aromatic dianhydrides via a two-step cyclization procedure. All the PPys show excellent high temperature stabilities with the initial decomposition temperatures of 530-549℃ and residual weight ratio of 49%-80% at 750℃ in nitrogen. The polymers exhibit no apparent glass transition temperatures （Tgs） except PPy-1 （Tg= 327℃）, which is derived from tetraamine DPPA and 2,2-bis[4-（3＇,4＇-dicarboxyphenoxy）-phenyl]propane dianhydride （BPADA）. In addition, the polymers have acceptable mechanical properties with the tensile strength of 65-94 MPa. The PPy films show excellent hydrolysis-resistance in alkaline aqueous medium and could maintain most of the properties even after boiling in 10% aqueous sodium hydroxide solution for a week.

关键词： Tetraamine Polypyrrolone Pyridine High temperature polymers Film Hydrolysis-resistance.

Discriminative Histogram Intersection Metric Learning and Its Applications

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2017年第3期32卷 507-519页

作者： Peng-Yi Hao yang xia xiao-Xin Li Sei-ichiro Kamata Sheng-Yong Chen College of Computer Science and Technology Zhejiang University of Technology Hangzhou 310023 China Graduate School of Information Production and Systems Waseda University Kitakyushu 808-0135 Japan

In this paper, a novel method called discriminative histogram intersection metric learning （DHIML） is proposed for pair matching and classification. Specifically, we introduce a discrimination term for learning a metric from binary infor-mation such as same/not-same or similar/dissimilar, and then combine it with the classification error for the discrimination in classifier construction. Compared with conventional approaches, the proposed method has several advantages. 1） The histogram intersection strategy is adopted into metric learning to deal with the widely used histogram features effectively. 2） By introducing discriminative term and classification error term into metric learning, a more discriminative distance metric and a classifier can be learned together. 3） The objective function is robust to outliers and noises for both features and labels in the training. The performance of the proposed method is tested on four applications： face verification, face-track identification, face-track clustering, and image classification. Evaluations on the challenging restricted protocol of Labeled Faces in the Wild （LFW） benchmark, a dataset with more than 7000 face-tracks, and Caltech-101 dataset validate the robustness and discriminability of the proposed metric learning, compared with the recent state-of-the-art approaches.

关键词： metric learning pair matching image classification face verification

General variational solution for seismic and static active earth pressure on rigid walls considering soil tensile strength cut-off

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第5期24卷 432-449页

作者： Shiguo xiao Yuan QI Pan xia Key Laboratory of High-Speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 60031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Department of Geological Engineering Southwest Jiaotong UniversityChengdu 610031China

According to the limit equilibrium state of soils behind rigid walls and the pseudo-static approach,a general closed-form solution to seismic and static active earth pressure on the walls,which considers shear and tension failure of the retained soil,is put forward using a variational calculus *** application point of the active resultant force specified in the proposed method is explained with a clear physical meaning related to possible movement modes of the *** respect of the derived nine dependent equations reflecting the functional characteristics of the earth pressure,the proposed method can be performed easily via an implicit *** are 13 basic factors related to the retained soils,walls,and external loads to be involved in the proposed *** tension crack segment of the slip surface is obviously influenced by these parameters,apart from vertical seismic coefficient and geometric bounds of the surcharge,but the shear slip segment maintains an approximately planar shape almost uninfluenced by these ***,the proposed method quantitatively reflects that the resultant of the active earth pressure is always within a limited range under different possible movements of the same wall.

关键词： Active earth pressure Tensile strength cut-off Variational calculus method Pseudo-static method Strip surcharge

卡瑞利珠单抗联合仑伐替尼或阿帕替尼对晚期肝癌患者肝功能及肿瘤标志物的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

肝脏 2023年第12期28卷 1440-1445页

作者：曹静夏晓阳尤冬山黄景慧周芸娜安徽医科大学附属滁州医院(滁州市第一人民医院)肿瘤内三科 239000

目的研究卡瑞利珠单抗联合仑伐替尼或阿帕替尼治疗晚期肝癌的疗效及对肝功能、肿瘤标志物的影响。方法收集2019年12月—2021年10月期间安徽医科大学附属滁州医院收治的晚期肝癌患者96例,根据治疗方案分为两组:48例使用卡瑞利珠单抗联合... 详细信息

目的研究卡瑞利珠单抗联合仑伐替尼或阿帕替尼治疗晚期肝癌的疗效及对肝功能、肿瘤标志物的影响。方法收集2019年12月—2021年10月期间安徽医科大学附属滁州医院收治的晚期肝癌患者96例,根据治疗方案分为两组:48例使用卡瑞利珠单抗联合仑伐替尼治疗为观察组,48例使用卡瑞利珠单抗联合阿帕替尼治疗为对照组。比较两组近期疗效,治疗前及治疗后检测总胆红素(TBil)、天冬氨酸氨基转移酶(AST)、丙氨酸氨基转移酶(ALT)、甲胎蛋白(AFP)、癌胚抗原(CEA)、糖类抗原199(CA199)和α-L-岩藻糖苷酶(AFU)水平,随访患者的生存情况。结果治疗后,观察组的TBil、AST、ALT分别为(20.12±2.03)μmol/L、(43.58±4.12)U/L、(43.46±4.82)U/L,较对照组的(22.06±3.19)μmol/L、(47.62±5.28)U/L、(46.55±6.13)U/L降幅更明显(P<0.05)。治疗后,观察组的AFP、CEA、CA199、AFU分别为(101.45±16.22)μg/L、(16.83±3.62)ng/mL、(143.21±21.65)U/mL、(35.02±5.69)U/L,较对照组的(124.87±21.69)μg/L、(18.75±4.43)ng/mL、(166.21±35.16)U/mL、(38.36±7.84)U/L明显降低(P<0.05)。观察组客观缓解率(ORR)和疾病控制率(DCR)分别为50.00%、83.33%,高于对照组的33.33%、68.75%(P<0.05)。观察组中位无进展生存期(PFS)为9.6个月,较对照组的6.2个月明显延长(P<0.05)。两组毒副反应发生类型及发生率差异不显著,均无因严重毒副作用而停药或退出研究者。结论卡瑞利珠单抗联合仑伐替尼或阿帕替尼治疗晚期肝癌均可在一定程度上保护肝功能和下调肿瘤标志物水平,毒副反应相对可控,而患者从卡瑞利珠单抗联合仑伐替尼中的生存获益可能优于联合阿帕替尼。

关键词：晚期肝癌卡瑞利珠单抗仑伐替尼阿帕替尼肝功能肿瘤标志物

维普期刊数据库博看期刊

Nondestructive determination of film thickness with laser-induced surface acoustic waves

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第9期27卷 457-461页

作者： xia xiao Tao Kong Hai yang Qi and Hui Quan Qing School of Microelectronic Tianjin Key Laboratory of Imaging and Sensing Microelectronic TechnologyTianjin UniversityTianjin 300072China

The application of surface acoustic waves（SAWs） for thickness measurement is presented. By studying the impact of film thickness h on the dispersion phenomenon of surface acoustic waves, a method for thickness determination based on theoretical dispersion curve v（ fh） and experimental dispersion curve v（ f） is developed. The method provides a series of thickness values at different frequencies f, and the mean value is considered as the final result of the measurement. The thicknesses of six interconnect films are determined by SAWs, and the results are compared with the manufacturer＇s *** relative differences are in the range from 0.4% to 2.18%, which indicates that the surface acoustic wave technique is reliable and accurate in the nondestructive thickness determination for films. This method can be generally used for fast and direct determination of film thickness.

关键词： thickness measurement dispersion curve surface acoustic waves layered structure

Catechol-Formaldehyde Resin Coated CdS Core-Shell Composite as Robust Photocatalyst for Long-Term Sustainable Artificial Photosynthesis of H_(2)O_(2)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第17期42卷 1975-1985页

作者： Yuexin xiang Zhinan xia Wanchao Hu Cuiyan Tong yang xiao Changli Lu Institute of Chemistry Northeast Normal UniversityChangchunJilin130024China

Catechol-formaldehyde resin(CFR)is very attractive for H_(2)O_(2) production via the catalytic ***,the H2O2 formation is accompanied by the oxidation of catechol groups to o-benzoquinone groups on CFR,which will cause irreversible damage to CFR and greatly limit its long-term stable catalytic ***,CdS/CFR composite photocatalyst with a core-shell structure was synthesized by hydrothermal *** photogenerated electrons of Cds are used as a powerful driving force for the reversible redox conversion between catechol groups and o-benzoquinone groups on the CFR.

关键词： Hydrogen peroxide Photocatalysis Catechol-formaldehyde resin Cds Core-shell structures Oxygen reduction reaction Charge transfer Heterogeneous catalysis

Metabolic pathway modulation by olanzapine:Multitarget approach for treating violent aggression in patients with schizophrenia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Psychiatry 2025年第1期15卷 37-53页

作者： Yan-Ning Song Shuang xia Zhi Sun Yong-Chao Chen Lu Jiao Wen-Hua Wan Hong-Wei Zhang xiao Guo Hua Guo Shou-Feng Jia xiao-Xin Li Shi-xian Cao Li-Bin Fu Meng-Meng Liu Tian Zhou Lv-Feng Zhang Qing-Quan Jia Department of Pharmacy The Affiliated Encephalopathy Hospital of Zhengzhou University(Zhumadian Second People's Hospital)Zhumadian 463000Henan ProvinceChina Department of Pharmacy The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052Henan ProvinceChina Department of Pharmacy Zhumadian First People's HospitalZhumadian 463000Henan ProvinceChina Scientific Education Section The Affiliated Encephalopathy Hospital of Zhengzhou University(Zhumadian Second People's Hospital)Zhumadian 463000Henan ProvinceChina Department of Psychiatry The Affiliated Encephalopathy Hospital of Zhengzhou University(Zhumadian Second People's Hospital)Zhumadian 463000Henan ProvinceChina Clinical Laboratory The Affiliated Encephalopathy Hospital of Zhengzhou University(Zhumadian Second People's Hospital)Zhumadian 463000Henan ProvinceChina Publicity Division The Affiliated Encephalopathy Hospital of Zhengzhou University(Zhumadian Second People's Hospital)Zhumadian 463000Henan ProvinceChina

BACKGROUND The use of network pharmacology and blood metabolomics to study the patho-genesis of violent aggression in patients with schizophrenia and the related drug mechanisms of action provides new directions for reducing the risk of violent aggression and optimizing treatment *** To explore the metabolic regulatory mechanism of olanzapine in treating patients with schizophrenia with a moderate to high risk of violent *** Metabolomic technology was used to screen differentially abundant metabolites in patients with schizophrenia with a moderate to high risk of violent aggression before and after olanzapine treatment,and the related metabolic pathways were *** pharmacology was used to establish protein-protein interaction networks of the core targets of *** Ontology functional analysis and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis were subsequently *** Compared with the healthy group,the patients with schizophrenia group presented significant changes in the levels of 24 metabolites related to the disruption of 9 metabolic pathways,among which the key pathways were the alanine,aspartate and glutamate metabolism and arginine biosynthesis *** treatment with olanzapine,the levels of 10 differentially abundant metabolites were significantly reversed in patients with *** effectively regulated six metabolic pathways,among which the key pathways were alanine,aspartate and glutamate metabolism and arginine biosynthesis *** core targets of olanzapine were involved in several key *** The metabolic pathways of alanine,aspartate,and glutamate metabolism and arginine biosynthesis are the key pathways involved in olanzapine treatment for aggressive schizophrenia.

关键词： Schizophrenia Violent aggression Olanzapine Metabolomics Network pharmacology

A New 2-Naphthate-based Layered Complex with Unusual Corner-sharing Triangular Magnetic Lattice

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 Structural Chemistry 2015年第5期34卷 703-709页

作者： xia Yan-Fei yang En-Cui LIU Zhong-Yi ZHAO xiao-Jun College of Chemistry Key Laboratory of Inorganic-organic Hybrid Functional Material ChemistryMinistry of EducationTianjin Key Laboratory of Structure and Performance for Functional MoleculesTianjin Normal University Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)

A new 2-naphthate（NA-）-based coordination complex,[Cu3（μ3-OH）4（NA）2]n（1）,was hydrothermally prepared and structurally and magnetically characterized.1 crystallizes in the monoclinic P21/c space group with a = 19.990（7）,b = 5.616（2）,c = 9.179（3） A,β = 96.536（6）°,V = 1023.8（7） A^3,Dc = 1.950 g/cm^3,Mr = 300.49,Z = 4,F（000） = 602,μ = 3.138 mm^-1,the final R = 0.0317 and w R = 0.0818 for 4944 observed reflections with I 〉 2σ（I）.Complex 1 exhibits an extended corner-sharing {Cu3（μ3-OH）}^5＋ triangle-based layered structure with the NA^-ligands located on both *** interplay of the typical anti-and ferromagnetic interactions mediated by μ3-OH^-and μ-syn,syn-carboxylate heterobridges leads to the overall intralayer ferromagnetic couplings of 1.

关键词： 2-naphthoic acid corner-sharing triangle crystal structure magnetic lattice