检索结果-南通市图书馆

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

尚诚杯业有限公司跨境电商平台选择

市场周刊 2024年第4期37卷 98-101,167页

作者：金佳宜张琴义陶展鹏安徽科技学院管理学院安徽蚌埠233100

随着“一带一路”倡议的提出,跨境电商逐渐成为中国联系世界的重要纽带。作为一种全球贸易的新模式,跨境电商为传统中小企业成功转型和盈利提供了重要契机,对跨境电商来说,平台的选择至关重要。因此,文章以永康市尚诚杯业有限公司为例,... 详细信息

随着“一带一路”倡议的提出,跨境电商逐渐成为中国联系世界的重要纽带。作为一种全球贸易的新模式,跨境电商为传统中小企业成功转型和盈利提供了重要契机,对跨境电商来说,平台的选择至关重要。因此,文章以永康市尚诚杯业有限公司为例,利用AHP法对影响跨境电商平台选择的相关因素进行分析评价,并提出针对性建议与对策。

关键词：跨境电商智慧零售层次分析法评价指标

维普期刊数据库博看期刊

OBE+“专创融合”的物流管理专业课程教学模式改革与实践

在线全文

学校读者我要写书评

暂无评论

邢台学院学报 2024年第2期39卷 171-179页

作者：张琴义曹稳奚雷夏翠萍武士文安徽科技学院安徽蚌埠233100

为了增强物流专业学生的学习效果,培养与社会需求相匹配的物流专业人才,对物流管理专业课程的改革方向进行了研究。针对物流管理专业特点及现存问题,对基于OBE+“专创融合”的教学模式进行了构建:构思基于“专创融合”理念的课程教学目... 详细信息

为了增强物流专业学生的学习效果,培养与社会需求相匹配的物流专业人才,对物流管理专业课程的改革方向进行了研究。针对物流管理专业特点及现存问题,对基于OBE+“专创融合”的教学模式进行了构建:构思基于“专创融合”理念的课程教学目标;设计基于OBE+“专创融合”理念的教学体系;最终将新的教学模式运用到物流管理专业其他课程。最后对采用该新教学模式前后两届学生的学习态度、学习感受、学习能力和学习成绩进行分析,以此检验新教学模式下学生的学习效果。

关键词： OBE(成果导向) 专创融合物流管理专业教学模式

MOF-based magnetic microrobot swarms for pH-responsive targeted drug delivery

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第4期67卷 1216-1223页

作者： qinyi Cao Yifan zhang Yanping Tang Changjin Wu Jizhuang Wang Dan Li College of Chemistry and Materials Science Jinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Spine and Spinal Cord Reconstruction The Fifth Affiliated Hospital(Heyuan Shenhe People’s Hospital)Jinan UniversityHeyuan 517000China JNU-HKUST Joint Laboratory for Neuroscience and Innovative Drug Research College of PharmacyJinan UniversityGuangzhou 510632China Department of Chemistry The University of Hong KongHong KongChina

Metal-organic frameworks(MOFs)hold significant potential as vehicles for drug delivery due to their expansive specific surface area,biocompatibility,and versatile ***,magnetically actuated micro/nano-robots(MNRs)offer distinct advantages,such as untethered and precise *** fusion of these technologies presents a promising avenue for achieving non-invasive targeted drug ***,we report a MOF-based magnetic microrobot swarm(MMRS)for targeted *** approach overcomes limitations associated with a single MNR,including limited drug loading and the risk of loss during *** select Zeolitic Imidazolate Framework-8(ZIF-8)as the drug vehicle for its superior loading potential and p H-sensitive *** design incorporates magnetic responsive components into the one-pot synthesis of Fe@ZIF-8,enabling collective behaviors under *** the yaw angle of alternating magnetic fields and nanoparticles'amount,the MMRSs with controllable size achieve instantaneous transformation among different configurations,including vortex-like swarms,chain-like swarms,and elliptical swarms,facilitating adaptation to environmental *** to the subcutaneous T24 tumor site,the MMRSs with encapsulated doxorubicin(DOX)automatically degrade and release the drug,leading to a dramatic reduction of the tumor in *** investigation signifies a significant advancement in the integration of biodegradable MOFs into microrobot swarms,ushering in new avenues for accurate and non-invasive targeted drug delivery.

关键词： magnetic microrobot swarm MOF nanoparticles magnetic propulsion pH-responsive drug release targeted drug delivery

同方期刊数据库

Microstructure and of Mechanics Microwave Boriding

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 528-531页

作者： YE Weiping HUANG Zilin zhang Qiaoxin zhang qinyi School of Materials ScienceandEngineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Microwave boriding layer microstructure of carbon steels and its diffusion mechanics were studied. The results show that the existence of microwave field in the boriding can＇t change the growth mechanics of boriding layer. Compared with conventional boriding, if the treatment temperature and time remain constantly, the descend rate of the boriding layer thickness with the increase of carbon content of steel is smaller. The diffusion activation energy ofT8 steel is 2.6× 10^5 J/mol between the temperature of 750 ℃ and 900 ℃ in microwave field, which is in the same order of conventional boriding.

关键词： microwave boriding boriding layer diffusion activation energy

在线全文

学校读者我要写书评

暂无评论

双三相永磁同步电机绕组开路故障诊断方法

电机与控制学报 2023年第5期27卷 108-116页

作者：王爽谢圣宝张秦一上海大学机电工程与自动化学院上海200444

为了实现对双三相永磁同步电机绕组开路故障的快速诊断与定位,利用双三相永磁同步电机所特有的谐波子平面,提出采用谐波子平面电流矢量并结合归一化处理方案的双三相永磁同步电机绕组开路故障诊断策略。首先,根据故障前后谐波子平面电... 详细信息

为了实现对双三相永磁同步电机绕组开路故障的快速诊断与定位,利用双三相永磁同步电机所特有的谐波子平面,提出采用谐波子平面电流矢量并结合归一化处理方案的双三相永磁同步电机绕组开路故障诊断策略。首先,根据故障前后谐波子平面电流矢量幅值大小的变化进行绕组开路故障的检测,其次,依据绕组开路故障后不同的电流矢量相角,准确定位出发生开路故障的绕组。为消除负载发生突变时可能造成的误诊断现象,进一步设计了针对谐波子平面电流矢量的归一化处理方案,提升对双三相永磁同步电机绕组开路故障诊断的鲁棒性。仿真和实验结果表明,所提策略能够快速地诊断并定位出绕组的开路故障,在负载发生突变时也可以表现出良好的可靠性和鲁棒性。

关键词：双三相永磁同步电机故障诊断策略绕组开路故障谐波子平面电流矢量归一化处理

Typhoon-and pollution-driven enhancement of reactive bromine in the mid-latitude marine boundary layer

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

National Science Review 2024年第4期11卷 93-101页

作者： Shanshan Wang qinyi Li Ruifeng zhang Anoop Sharad Mahajan Swaleha Inamdar Nuria Benavent Sanbao zhang Ruibin Xue Jian Zhu Chenji Jin Yan zhang Xiao Fu Alba Badia Rafael P.Fernandez Carlos A.Cuevas Tao Wang Bin Zhou Alfonso Saiz-Lopez Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3) Department of Environmental Science and Engineering Fudan University Institute of Eco-Chongming(IEC) Department of Atmospheric Chemistry and Climate Institute of Physical Chemistry Blas CabreraCSIC Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Environment Research Institute Shandong University Centre for Climate Change Research Indian Institute of Tropical MeteorologyMinistry of Earth Sciences Department of Chemistry University of Colorado Boulder Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua University Sostenipra Research Group Institute of Environmental Science and Technology(ICTA)Universitat Autonoma de Barcelona(UAB) Institute for Interdisciplinary Science (ICB) National Research Council (CONICET)

Tropospheric reactive bromine is important for atmospheric chemistry,regional air pollution,and global *** studies have reported measurements of atmospheric reactive bromine species in different environments,and proposed their main sources,***-salt aerosol（SSA）,oceanic biogenic activity,polar snow/ice,and *** and other strong cyclonic activities（***） induce abrupt changes in different earth system processes,causing widespread destructive ***,the role of typhoons in regulating reactive bromine abundance and sources remains ***,we report field observations of bromine oxide（BrO）,a critical indicator of reactive bromine,on the Huaniao Island（HNI）in the East China Sea in July *** observed high levels of BrO below 500 m with a daytime average of9.7±4.2 pptv and a peak value of ～26 pptv under the influence of a *** field measurements,supported by model simulations,suggest that the typhoon-induced drastic increase in wind speed amplifies the emission of SSA,significantly enhancing the activation of reactive bromine from SSA *** also detected enhanced BrO mixing ratios under high NOxconditions（ppbv level） suggesting a potential pollution-induced mechanism of bromine release from *** elevated levels of atmospheric bromine noticeably increase ozone destruction by as much as ～40% across the East China *** the high frequency of cyclonic activity in the northern hemisphere,reactive bromine chemistry is expected to play a more important role than previously thought in affecting coastal air quality and atmospheric oxidation *** suggest that models need to consider the hitherto overlooked typhoon-and pollution-mediated increase in reactive bromine levels when assessing the synergic effects of cyclonic activities on the earth system.

关键词： reactive bromine atmospheric chemistry marine boundary layer atmospheric oxidation capacity marine emission

Gigahertz-rate-switchable wavefront shaping through integration of metasurfaces with photonic integrated circuit

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advanced Photonics 2024年第1期6卷 106-114页

作者： Haozong Zhong Yong Zheng Jiacheng Sun Zhizhang Wang Rongbo Wu Ling-en zhang Youting Liang qinyi Hua Minghao Ning Jitao Ji Bin Fang Lin Li Tao Li Ya Cheng Shining Zhu East China Normal University School of Physics and Electronic ScienceState Key Laboratory of Precision SpectroscopyShanghaiChina Nanjing University College of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresNanjingChina China Jiliang University College of Optical and Electronic TechnologyHangzhouChina Shanxi University Collaborative Innovation Center of Extreme OpticsTaiyuanChina Chinese Academy of Sciences(CAS) Shanghai Institute of Optics and Fine Mechanics(SIOM)State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser ScienceShanghaiChina

Achieving spatiotemporal control of light at high speeds presents immense possibilities for various applications in communication,computation,metrology,and *** integration of subwavelength metasurfaces and optical waveguides offers a promising approach to manipulate light across multiple degrees of freedom at high speed in compact photonic integrated circuit(PIC)***,we demonstrate a gigahertz-rate-switchable wavefront shaping by integrating metasurface,lithium niobate on insulator photonic waveguides,and electrodes within a PIC *** proofs of concept,we showcase the generation of a focus beam with reconfigurable arbitrary polarizations,switchable focusing with lateral focal positions and focal length,orbital angular momentum light beams as well as Bessel *** measurements indicate modulation speeds of up to the gigahertz *** integrated platform offers a versatile and efficient means of controlling the light field at high speed within a compact system,paving the way for potential applications in optical communication,computation,sensing,and imaging.

关键词： metasurface photonic integrated circuit lithium niobate on insulator high-speed modulation

在线全文

学校读者我要写书评

暂无评论

冷泉环境自生矿物多硫同位素特征及应用

海洋地质与第四纪地质 2022年第3期42卷 62-75页

作者：张覃谊邬黛黛刘丽华中国科学院天然气水合物重点实验室中国科学院广州能源研究所广州510640 中国科学院大学北京100049 中国科学院南海生态环境工程创新研究院广州510301

正常海相沉积物中普遍存在有机质硫酸盐还原作用(OSR),但在冷泉区,硫酸盐还原-甲烷厌氧氧化作用(SR-AOM)则占据主导地位。如何区分这两种硫酸盐还原途径,对研究极端环境下的生物地球化学过程具有重要意义。为进一步概括、了解冷泉区与SR... 详细信息

正常海相沉积物中普遍存在有机质硫酸盐还原作用(OSR),但在冷泉区,硫酸盐还原-甲烷厌氧氧化作用(SR-AOM)则占据主导地位。如何区分这两种硫酸盐还原途径,对研究极端环境下的生物地球化学过程具有重要意义。为进一步概括、了解冷泉区与SR-AOM相关的自生矿物的多硫同位素特征及其建模应用,在广泛调研国内外与SR-AOM相关的多硫同位素研究成果的基础上,综述了SR-AOM成因的黄铁矿和冷泉重晶石的多硫同位素特征。在此基础上,分别针对黄铁矿和冷泉重晶石概括已被广泛应用的稳定状态盒模型和1-D反应转移模型。SR-AOM成因的黄铁矿相比OSR成因的黄铁矿具有更高的δ34S值和Δ33S值。同时,SR-AOM成因的黄铁矿的δ34S值和Δ33S值呈负相关性,不同于OSR的正相关性。此外,冷泉重晶石的负Δ33S-δ´34S相关性与受OSR控制的孔隙水硫酸盐的正相关性亦明显不同。在冷泉环境中,与SR-AOM相关的自生矿物多硫同位素特征能有效示踪该极端条件下硫同位素的演化,且有利于区分SR-AOM和OSR,这为研究极端环境下的生物地球化学过程和示踪潜在的天然气水合物矿藏提供了有效依据。

关键词：冷泉硫酸盐甲烷转换带硫酸盐还原-甲烷厌氧氧化作用黄铁矿重晶石

“杯水车薪”抑或“雪中送炭”——低利率环境下货币政策的有效性研究

在线全文

学校读者我要写书评

暂无评论

南方经济 2024年第5期 75-94页

作者：张小宇黄沁怡吉林大学数量经济研究中心 130012 吉林大学商学与管理学院 130012

为应对内需不足的内部环境和严峻复杂的外部环境,我国货币政策仍将保持低利率状态,然而低利率环境下货币政策的实施效果究竟如何是政策制定者的核心关切。现有对于低利率环境下的货币政策有效性研究大多集中于发达国家,缺少对于当前中... 详细信息

为应对内需不足的内部环境和严峻复杂的外部环境,我国货币政策仍将保持低利率状态,然而低利率环境下货币政策的实施效果究竟如何是政策制定者的核心关切。现有对于低利率环境下的货币政策有效性研究大多集中于发达国家,缺少对于当前中国情景下的深入探讨,而且局部投影模型尚未应用于货币政策非对称效应的研究。本文首先构建理论框架系统性分析了我国高、低利率时期货币政策的作用机理,然后基于状态依存局部投影模型定量分析了我国高、低利率时期货币政策的时变效应。研究发现:(1)我国扩张性货币政策冲击无论在高、低利率时期均能有效提升产出,从而实现预期的调控效果。(2)我国暂未陷入“流动性陷阱”,低利率时期扩张性货币政策冲击对产出、投资和消费的效应会增强,货币政策确实能起到“雪中送炭”的作用,常规货币政策尚能有效刺激消费和投资意愿,进而拉动总需求。(3)高杠杆会增强低利率时期产出和投资对扩张性货币政策冲击的响应,但会削弱消费的响应,这是因为高杠杆促使企业减少用于缓解日常运转的资金,增加用于长期投资的资金,高杠杆还会增加居民房地产投资,增强流动性约束,从而挤占居民消费。文章结论为优化货币政策有效性,增强货币政策传导效果提出建设性政策建议。

关键词：低利率非线性局部投影状态依存货币政策传导机制