检索结果-南通市图书馆

Organic Chemistry Frontiers 2022年第5期9卷 1375-1382页

作者： Yong Liu shuya xing Jing Zhang Wen Liu Yuenian Xu Yan Zhang Kefang Yang Lei Yang Kezhi Jiang Xinxin Shao College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material Technology of Ministry of EducationHangzhou Normal UniversityHangzhou 311121ZhejiangPeople’s Republic of China

A nickel-catalyzed reductive cross coupling between organic iodides and thiosulfonates and a selenosulfo-nate under mild conditions is *** practical method provides a facile access to a series of unsym-metrical thioet... 详细信息

关键词： nickel catalyzed coupling

Epitaxial growth of antimony nanofilms on HOPG and thermal desorption to control the film thickness

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 Physics B 2020年第9期29卷 164-171页

作者： shuya xing Le Lei Haoyu Dong Jianfeng Guo Feiyue Cao Shangzhi Gu Sabir Hussain Fei Pang Wei Ji Rui Xu Zhihai Cheng Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100039China

Group-V elemental nanofilms were predicted to exhibit interesting physical properties such as nontrivial topological properties due to their strong spin-orbit coupling,the quantum confinement,and surface *** was reported that the ultrathin Sb nanofilms can undergo a series of topological transitions as a function of the film thickness h:from a topological semimetal(h>7.8 nm)to a topological insulator(7.8 nm>h>2.7 nm),then a quantum spin Hall(QSH)phase(2.7 nm>h>1.0 nm)and a topological trivial semiconductor(h<1.0 nm).Here,we report a comprehensive investigation on the epitaxial growth of Sb nanofilms on highly oriented pyrolytic graphite(HOPG)substrate and the controllable thermal desorption to achieve their specific *** morphology,thickness,atomic structure,and thermal-strain effect of the Sb nanofilms were characterized by a combination study of scanning electron microscopy(SEM),atomic force microscopy(AFM),and scanning tunneling microscopy(STM).The realization of Sb nanofilms with specific thickness paves the way for the further exploring their thickness-dependent topological phase transitions and exotic physical properties.

关键词： epitaxial growth antimony films scanning tunneling microscope(STM) thermal desorption

Epitaxial fabrication of AgTe monolayer on Ag(111)and the sequential growth of Te film

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第6期16卷 125-131页

作者： Haoyu Dong Le Lei shuya xing Jianfeng Guo Feiyue Cao Shangzhi Gu Yanyan Geng Shuo Mi Hanxiang Wu Yan Jun Li Yasuhiro Sugawara Fei Pang Wei Ji Rui Xu Zhihai Cheng Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Department of Applied Physics Graduate School of EngineeringOsaka University2-1 YamadaokaSuitaOsaka 565-0871Japan

Transition-metal chalcogenides(TMCs)materials have attracted increasing interest both for fundamental research and industrial *** all these materials,two-dimensional(2D)compounds with honeycomb-like structure possess exotic electronic ***,we report a systematic study of TMC monolayer AgTe fabricated by direct depositing Te on the surface of Ag(111)and *** intrinsic defects are observed and studied by scanning tunneling microscopy,indicating that there are two kinds of AgTe domains and they can form gliding ***,the monolayer AgTe can serve as the template for the following growth of Te ***,some Te atoms are observed in the form of chains on the top of the bottom Te *** findings in this work might provide insightful guide for the epitaxial growth of 2D materials for study of novel physical properties and for future quantum devices.

关键词： AgTe monolayer Te film epitaxial growth scanning tunneling microscopy two-dimensional materials transition-metal chalcogenides

Phase transition-induced superstructures ofβ-Sn films with atomic-scale thickness

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第9期30卷 434-439页

作者： Le Lei Feiyue Cao shuya xing Haoyu Dong Jianfeng Guo Shangzhi Gu Yanyan Geng Shuo Mi Hanxiang Wu Fei Pang Rui Xu Wei Ji Zhihai Cheng Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China

The ultrathinβ-Sn(001)films have attracted tremendous attention owing to its topological superconductivity(TSC),which hosts Majorana bound state(MBSs)for quantum ***,β-Sn(001)thin films have been successfully fabricated via phase transition ***,the understanding of structural phase transition ofβ-Sn(001)thin films is still ***,we report the direct growth of ultrathinβ-Sn(001)films epitaxially on the highly oriented pyrolytic graphite(HOPG)substrate and the characterization of intricate structural-transition-induced *** morphology was obtained by using atomic force microscopy(AFM)and low-temperature scanning tunneling microscopy(STM),indicating a structure-related bilayer-by-bilayer growth *** ultrathinβ-Sn film was made of multiple domains with various *** high-symmetric and distorted superstructures were observed in the atomic-resolution STM images of these *** formation mechanism of these superstructures was further discussed based on the structural phase transition ofβtoα-Sn at the atomic-scale *** work not only brings a deep understanding of the structural phase transition of Sn film at the two-dimensional limit,but also paves a way to investigate their structure-sensitive topological properties.

关键词： epitaxial growth β-Sn films bilayer-by-bilayer superstructures structural transition scanning tunneling microscopy surface energy

Toplayer-dependent crystallographic orientation imaging in the bilayer two-dimensional materials with transverse shear microscopy

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第5期16卷 165-172页

作者： Sabir Hussain Rui Xu Kunqi Xu Le Lei shuya xing Jianfeng Guo Haoyu Dong Adeel Liaqat Rashid Iqbal Muhammad Ahsan Iqbal Shangzhi Gu Feiyue Cao Yan Jun Li Yasuhiro Sugawara Fei Pang Wei Ji Liming Xie Shanshan Chen Zhihai Cheng Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing100872China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China University of Chinese Academy of Sciences Beijing100039China Department of Applied Physics Graduate School of EngineeringOsaka University2-1 YamadaokaSuitaOsaka565-0871Japan

Nanocontact properties of two-dimensional(2D)materials are closely dependent on their unique nanomechanical systems,such as the number of atomic layers and the supporting ***,we report a direct observation of toplayer-dependent crystallographic orientation imaging of 2D materials with the transverse shear microscopy(TSM).Three typical nanomechanical systems,MoS_(2) on the amorphous SiO_(2)/Si,graphene on the amorphous SiO_(2)/Si,and MoS_(2) on the crystallized Al_(2)O_(3),have been investigated in *** experimental observation reveals that puckering behaviour mainly occurs on the top layer of 2D materials,which is attributed to its direct contact adhesion with the AFM ***,the result of crystallographic orientation imaging of MoS_(2)/SiO_(2)/Si and MoS_(2)/Al_(2)O_(3) indicated that the underlying crystalline substrates almost do not contribute to the puckering effect of 2D *** work directly revealed the top layer dependent puckering properties of 2D material,and demonstrate the general applications of TSM in the bilayer 2D systems.

关键词： 2D materials toplayer-dependent crystallographic orientation imaging nanomechanical contact properties transverse shear microscopy

Direct contact moxibustion promotes apoptosis of gastric cancer cells in rats by regulating intestinal flora

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2021年第6期41卷 943-952页

作者： PAN Lijia MA shuya WEN Jing ZHANG Xiaoqi xing Haijiao JIA Chunsheng College of Acupuncture and Moxibustion Hebei University of Chinese MedicineShijiazhuang 050200China

OBJECTIVE:To examine whether direct contact moxibustion(DCM)can prevent and treat gastric cancer(GC)by regulating intestinal flora in ***:Male Wistar rats were randomly divided into normal group,normal+DCM control group,model group,and model+DCM *** cancer rats were induced by N-methyl-N-nitro-N-nitrosoguanidine(MNNG,20 mg/mL)by *** the same time,the model rats and normal rats were given DCM at Zusanli(ST36),Weishu(BL21),and Zhongwan(CV12)for 16 *** treatment,gastric tissues were collected to analyze the pathological changes and the apoptosis of gastric mucosa *** addition,the cecal stool was taken and analyzed by 16 s r RNA ***:Gastric cancer-like pathological changes and different abundance of the intestinal flora were found in the model *** promoted mucosa tissue apoptosis and regulated the abnormal changes of the intestinal microflora caused by MNNG;DCM also inhibited the growth of Ruminococcaceae and Prevotellaceae flora and promoted the growth of probiotic ***,DCM made the composition and abundance of intestinal microflora in the GC rats tending to the normal ***:DCM stimulating Zusanli(ST36),Weishu(BL21),and Zhongwan(CV12)promoted the apoptosis of gastric mucosa and delayed the progression of gastric cancer,possibly by decreasing Ruminococcaceae and Prevotellaceae bacteria(bacteria that produce short-chain fatty acids in the intestine)and promoting the growth of probiotic Akkermansia.

关键词： moxibustion methylnitronitrosoguanidine stomach neoplasms gastrointestinal microbiome

Step distribution of Yb filling fraction during microstructural evolution in skutterudites

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2019年第1期8卷 62-71页

作者： Jing MEI Zheng YAO shuya ZHU Dongli HU Ying JIANG Juanjuan xing Hui GU Lidong CHEN School of Materials Science and Engineering and Materials Genome Institute Shanghai University State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences

To achieve a better material for thermoelectric power generation device, filled skutterudite Yb0.3 Co_4 Sb_(12) samples were fabricated by melting-quenching-annealing-spark plasma sintering(SPS)method. Two sets of samples, before and after SPS, were investigated. In both the two sets of samples,the average grain size of the samples increases monotonously with the increase of annealing time,while Yb filling fraction firstly increases and then decreases. Yb not filling into the skutterudite remains at the grain boundaries in the form of Yb_2 O_3 after SPS, which could be quantified by the spatially difference method of energy dispersive spectra. Step distribution of Yb filling fraction was observed in the samples annealed for 1 h, which was caused by the microstructural evolution from the peritectic phases to the skutterudite phase. The sample annealed for 3 days and SPS sintered possesses the maximum value of Yb filling fraction 0.249 and the maximum ZT value of 1.24 at 850 K. These results are helpful to better understand the microstructural evolution and Yb filling behavior in skutterudite materials.

关键词： skutterudite ytterbium filling fraction microstructure step distribution

在线全文

学校读者我要写书评

暂无评论

钢铁行业钙基半干法脱硫灰渣资源化利用进展

工程科学学报 2024年第3期46卷 567-579页

作者：钱大益王艳叶凯航邢奕苏伟段淑雅伊犁师范大学化学与环境科学学院污染物化学与环境治理重点实验室伊宁835000 北京科技大学能源与环境工程学院北京100083

对首钢和唐钢循环流化床(CFB)、密相塔(DFA)烟气脱硫灰氧化改性进行了深入研究,脱硫灰分的矿物相组成主要包括CaSO_(3)·0.5H_(2)O、CaSO_(4)、CaCO_(3)、Ca(OH)_(2),平均粒径为7.252μm、中位粒径(D_(50))为4.521μm、80%的粒子粒径处... 详细信息

对首钢和唐钢循环流化床(CFB)、密相塔(DFA)烟气脱硫灰氧化改性进行了深入研究,脱硫灰分的矿物相组成主要包括CaSO_(3)·0.5H_(2)O、CaSO_(4)、CaCO_(3)、Ca(OH)_(2),平均粒径为7.252μm、中位粒径(D_(50))为4.521μm、80%的粒子粒径处于1.039~16.162μm、比表面积为2.25 m^(2)·g^(–1),比表面积相对较大,且喷雾干燥(SDA)法脱硫灰粒径明显大于CFB与DFA法;脱硫灰含水率0.02%~0.36%,体积密度0.85~1.0 t·m^(–3),容积密度0.55~1.0 t·m^(–3),真密度2.25~2.69 t·m^(–3),压实密度为1.4 t·m^(–3);脱硫灰粒大小不一,形状多为不规则的小类球体且孔道直径在0.1~0.2μm.结合半干法脱硫灰理化性质系统表征、改性与工业化应用等成果,系统分析目前钢铁企业及其他半干法脱硫灰资源化利用研究的主要方向和进展情况,提出利用半干法脱硫灰制备多种新型材料实现半干法脱硫灰资源化利用.

关键词：烧结球团钙基半干法脱硫灰渣资源化利用

零售商公平偏好下两周期供应链的信息分享策略研究

在线全文

学校读者我要写书评

暂无评论

工业技术经济 2019年第7期38卷 38-45页

作者：王文宾张梦周姝娅蒋星中国矿业大学管理学院

本文通过建立具有公平偏好行为的零售商和公平中性的制造商组成的两周期供应链动态博弈模型,旨在探讨两周期供应链中具有公平偏好行为的零售商的信息分享策略对制造商和零售商决策的影响。研究表明:(1)零售商的最优策略是两周期均不向... 详细信息

本文通过建立具有公平偏好行为的零售商和公平中性的制造商组成的两周期供应链动态博弈模型,旨在探讨两周期供应链中具有公平偏好行为的零售商的信息分享策略对制造商和零售商决策的影响。研究表明:(1)零售商的最优策略是两周期均不向制造商分享信息;而对制造商来讲,零售商选择两周期均分享信息策略,制造商可以获得最高的效用;(2)零售商的公平偏好行为对自身有利,单位公平偏好系数对零售商效用的影响大于信息精确度对零售商效用的影响;(3)若零售商向制造商分享信息,则增加信息精确度可以弥补零售商公平偏好行为对制造商带来的损失。

关键词：公平偏好信息分享预测精确度两周期供应链动态博弈企业合作

流行性感冒合并急性呼吸衰竭患者的临床特征及预后分析

在线全文

学校读者我要写书评

暂无评论

中华危重病急救医学 2020年第11期32卷 1304-1309页

作者：段甲利杨跃杰侯淑娅邢夏孙孟飞刘洋邢丽华郑州大学第一附属医院呼吸与危重症医学科河南郑州450052 郑州市第六人民医院重症医学科河南郑州450015

目的探讨流行性感冒(流感)合并急性呼吸衰竭(呼衰)患者的临床特征并分析影响预后的相关危险因素。方法回顾性分析2018年1月至2020年1月郑州大学第一附属医院及郑州市第六人民医院重症医学科收治的流感合并急性呼衰患者的临床资料。根据... 详细信息

目的探讨流行性感冒(流感)合并急性呼吸衰竭(呼衰)患者的临床特征并分析影响预后的相关危险因素。方法回顾性分析2018年1月至2020年1月郑州大学第一附属医院及郑州市第六人民医院重症医学科收治的流感合并急性呼衰患者的临床资料。根据预后将患者分为存活组和死亡组。分析两组患者的人口学特征、基础疾病、实验室检查、治疗以及预后相关指标;采用单因素和多因素Logistic回归分析影响流感合并急性呼衰患者死亡的危险因素,分析淋巴细胞和淋巴细胞亚群的相关性,并比较不同急性生理学与慢性健康状况评分Ⅱ(APACHEⅡ)和淋巴细胞计数(LYM)亚组患者生存率的差异。结果104例流感合并急性呼衰患者中,64.4%(67例)有基础疾病,91.3%(95例)患者感染甲型流感病毒,患者住院病死率为39.4%(41例)。与存活组比较,死亡组患者呼吸频率(次/min:26.0±5.6比23.7±5.0)、入住重症监护病房(ICU)24 h内APACHEⅡ评分(分:18.20±4.88比12.35±4.58)、降钙素原〔PCT(μg/L):0.82(0.23,4.63)比0.39(0.11,0.92)〕水平和心血管疾病比例〔24.4%(10/41)比7.9%(5/63)〕以及有创通气比例〔63.4%(26/41)比17.5%(11/63)〕均更高(均P14分时,提示患者不良预后的风险显著增加。相关性分析显示:LYM与淋巴细胞亚群(T淋巴细胞、CD4^(+)T细胞和CD8^(+)T细胞)计数之间存在显著的正相关性(r值分别为0.593、0.563、0.500,均P<0.001)。结论流感合并急性呼衰患者病情严重,病死率高,入住ICU时的APACHEⅡ评分、PaO_(2)/FiO_(2)以及LYM是影响患者预后的独立危险因素。

关键词：流行性感冒成人急性呼吸衰竭临床特征预后