检索结果-南通市图书馆

An Efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron Nitride Nanotubes

Nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai Zhang Liping Ding liyun wu Songfeng E Qian He Nanyang Wang Hui Zuo Zhengyang Zhou Feng Ding Yue Hu Jin Zhang Yagang Yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BNNTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BNNTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with N atoms to form BN *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BNNTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation Density functional theory

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A New Class of Partial Orders

引用

Algebra Colloquium 2023年第4期30卷 585-598页

作者： Huihui Zhu liyun wu School of Mathematics Hefei University of TechnologyHefei 230009China

Let R be a unital*-*** any a,w,b∈R,we apply the w-core inverse to define a new class of partial orders in R,called the w-core partial *** that a,b∈R are w-core *** say that a is below b under the w-core partial order if a_(w)^(#)a=a_(w)^(#)b and a_(w)a_(w)^(#)=bwa_(w)^(#),where a_(w)^(#)denotes the w-core inverse of *** of the w-core partial order are given,and its relationships with several types of partial orders are also *** particular,we show that the core partial order coincides with the a-core partial order,and the star partial order coincides with the a*-core partial order.

关键词： w-core inverse inverse along an element sharp partial order star partial order core partial order rings with involution

来源：

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

Protection efficiency assessment and quality of coastal shelterbelt for Dongshan Island at the coastal section scale

引用

Journal of Forestry Research 2017年第3期28卷 577-584页

作者： liyun wu Dongjin He Zhirong Ji Weibin You Yong Tan Xiaoyan Zhen Jianwen Yang Forestry College Fujian Agriculture and Forestry UniversityFuzhou 350002People's Republic of China Dongshan County Technology Bureau Dongshan 363400People's Republic of China

The coastal shelter forest in China is under threat of destruction and degradation because of the impact of human activities. Protection efficiency assessment of the coastal shelterbelt is an important component of shelterforest remediation planning and sustainable management. In this study, a protection efficiency index （PEI） model was established using the projection pursuit method to assess the protective quality of the coastal shelter forest at the coastal section scale of Dongshan Island, China. Three criteria were used, including forest stand structure, forest belt structure, and windbreak effect; each criterion further comprised multiple factors. Based on survey data of 31 plots in the coastal shelter forest of Dongshan Island, we calculated PEI values using a projection of a pursuit model. The result showed 64.5 % of the PEIs fell at or below the middle level, which can indicate the status of the coastal shelterbelt is unsatisfactory. To further explore whether the different bays and land use types create significant differences in PEIs and evaluation indices, we used an ANOVA to test the influence of various bays and forms of land use on coastal shelterbelts. The results showed that PEI and most of the indices differed significantly by bay; mean tree height, mean DBH, mean crown width, stand density, vegetation coverage, and wind velocity reduction differed significantly by land use. Therefore, relevant measures for different locations, bays and surrounding land use can be proposed to improve the existing conditions of the coastal shelterbelt. The results of this study provide a theoretical and technical framework for future changes and sustainable management of coastal shelterbelt on Dongshan Island.

关键词： ANOVA analysis Dongshan Island Coastal shelterbelt Protection efficiency assessment Projection pursuit

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

In situ hydrothermal growth of Ni-based hydrogen phosphate polyhedrons on Ni foam for efficient hydrogen evolution reaction

Resources Chemicals and Materials

引用

Resources Chemicals and Materials 2024年第4期3卷 270-278页

作者： Shisheng Yuan liyun wu Renzheng Jiang Shenglin Sun Yingpeng Xie Key Laboratory on Resources Chemicals and Materials of Ministry of Education College of Chemical EngineeringShenyang University of Chemical TechnologyShenyang110142China Shenyang Key Laboratory of Chemical Pollution Control Shenyang University of Chemical TechnologyShenyang 110142China

Developing a cost-effective and stable electrocatalyst is the key to achieve the large-scale applications of water electrolysis to produce green ***;an in situ hydrothermal growth strategy was put forward to prepare a novel self-supporting electrode;that is;Ni-based hydrogen phosphate polyhedrons supported on 3D Ni *** electrode was composed of crystalline(Ni(H2PO4)2⋅2H2O;Ni(H3P2O7)2⋅2H2O);and amorphous phase in which NiO nanoparticles *** amorphous phase connected polyhedrons to the Ni foam substrate;forming multifarious heterogeneous *** a structure possessed large number of active sites;favored the fast reaction kinetics and electron transport rate;synergistically resulting in a superior alkaline HER *** alkaline electrolyte;the electrode only needed a small overpotential of 69 mV to reach the current density of 10 mA cm-2 with a small Tafel slope of 56 mV dec-1;and exhibited a good stability at the current density of 100 mA cm-2 for 50 *** in situ hydrothermal growth strategy opened up a new route to green synthesis of cost-effective and stable 3D heterostructured self-supporting electrode for water-splitting.

关键词： Self-supporting electrode In situ growth Heterostructure Phosphate Hydrogen evolution reaction

来源：

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

Growth of boron nitride nanotubes from magnesium-based catalysts

引用

Nano Research 2023年第8期16卷 11048-11053页

作者： Ying Wang Kai Zhang liyun wu Xuhua He Qian He Nanyang Wang Zhengyang Zhou Chaowei Li Yue Hu Yagang Yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Henan Key Laboratory of New Optoelectronic Functional Materials College of Chemistry and Chemical EngineeringAnyang Normal University436 Xian'ge RoadAnyang 455000China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000China

This study reports an efficient method for growing high-quality boron nitride nanotubes(BNNTs)via chemical vapor deposition of low-melting-point precursors—magnesium diboride(MgB_(2)),magnesium nitride(Mg_(3)N_(2)),and diboron trioxide(B_(2)O)at a growth temperature of 1000–1300℃.The strong oxygen-capturing ability of Mg_(3)N_(2)inhibits the formation of high-melting-point Mg_(3)B_(2)O_(6),which helps MgB_(2)to maintain an efficient and stable catalytic capacity,thereby enhancing its growth efficiency and utilization of the boron ***,polydimethylsiloxane(PDMS)composites formed from these BNNTs demonstrated much greater thermal conductivities than pure ***,this novel strategy for preparing BNNTs is efficient,and they have great potential for application as thermal interface materials.

关键词： boron nitride nanotubes(BNNTs) low-melting-point chemical vapor deposition(CVD) thermal conductivities

来源：

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

数字化驱动的企业供应链协同创新

引用

全国流通经济 2025年第2期 69-72页

作者：吴利云云南交投公路建设第四工程有限公司云南昆明650299

随着数字化技术的迅速发展,企业供应链面临着深刻变革。本文聚焦于数字化驱动的企业供应链协同创新,深入探讨了相关理论基础及发展现状。分析了数字化在企业供应链采购、生产、物流和销售等环节的应用情况与成果,阐述了当前的举措,如技... 详细信息

随着数字化技术的迅速发展,企业供应链面临着深刻变革。本文聚焦于数字化驱动的企业供应链协同创新,深入探讨了相关理论基础及发展现状。分析了数字化在企业供应链采购、生产、物流和销售等环节的应用情况与成果,阐述了当前的举措,如技术投入、组织变革与合作等。本文揭示了协同创新机制,包括信息、物流和营销协同等方面。同时指出存在的问题与挑战,如技术应用困难、协同合作障碍、外部环境不确定性和人才短缺等,并提出相应的解决措施。旨在为企业提升供应链协同创新能力,适应数字化时代竞争提供理论支持与实践指导。

关键词：数字化企业供应链协同创新发展现状

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of Quality and Government Subsidies on Elderly Care Services

引用

Proceedings of Business and Economic Studies 2021年第4期4卷 139-145页

作者： Mengna Li liyun wu School of Energy Science&Engineering Henan Polytechnic UniversityJiaozuo 454003Henan ProvinceChina

In order to solve the problem of imbalance resource allocation and service income in the elderly care service industry,this article establishes three service income models in different situations for a single provider and a single integrator while considering the quality as well as government *** results showed that government subsidies can significantly improve quality efforts and service income with a mutual restriction between quality and service *** subsidies would have an impact on the quality,and they are more conducive to the service income of *** government subsidies are less than 80% of the service income,the incentive effect is better.

关键词： Revenue model Pension service supply chain Quality preference Government subsidies

来源：

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

Research on the Selection of Supply Chain Marketing Models Based on E-commerce Service Levels

引用

Proceedings of Business and Economic Studies 2021年第4期4卷 197-207页

作者： Weijia Ding liyun wu School of Energy Science and Engineering Henan Polytechnic University Jiaozuo 454000China

Based on the game theory,the service sensitivity coefficient is introduced to construct four marketing game models,which include a single flagship store,a single self-operated store,a direct sales-flagship store,and a direct sales-self-operated store,in combination with numerical analysis methods to analyze manufacturers and e-commerce platforms in different *** study found that the service levels affected the profit of each entity in the supply *** service levels of self-operated stores were higher than those of the flagship stores,and the opening of direct sales channels had a stimulating effect on the service levels of e-commerce platforms to a certain *** consideration of the service levels and the ability to build direct sales channels,the direct sales-flagship store marketing model is the best choice for manufacturers whereas e-commerce platforms are more inclined to open self-operated ***,the opening of manufacturers'direct sales channels is not necessarily beneficial to e-commerce platforms.

关键词： E-commerce Marketing mode Service level Game theory

来源：

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

A study of the temporal and spatial variations in the suitability of the environment in Chinese cities for tourism and in strategies for optimizing the environment

引用

International Journal of Digital Earth 2022年第1期15卷 527-552页

作者： Ying Li Shuhui Zhang Jingting Han Yi Zhao Quan Han liyun wu Xin Wang Ziyi Qiu Tongqian Zou Cheng Fan China Academy of Culture and Tourism Beijing International Studies UniversityBeijingPeople’s Republic of China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of ScienceBeijingPeople’s Republic of China Beijing Boneng Technology Co. LtdBeijingPeople’s Republic of China Beijing Qinxing International Cultural Exchange Center BeijingPeople’s Republic of China State Environment Protection Key Laboratory of Satellite Remote Sensing Aerospace Information Research InstituteChinese Academy of SciencesBeijingPeople’s Republic of China

With the aim of guaranteeing the interests and health of tourists,this study comprehensively evaluates the suitability of the environment in different cities in China for tourism by considering the impacts of climate,vegetation and environmental factors on *** Universal Thermal Climate Index(UTCI),total precipitation(PREC),Vegetation Leaf Area Index(LAI),concentration of particulate matter with a diameter of less than 2.5μm(PM2.5),and the downward UV radiation at the surface(UVB)are used as *** addition,the Delphi–AHP–TOPSIS algorithm is introduced and is used for the comprehensive evaluation of the environmental suitability of 684 cities in China for tourism in *** is found that Chinese cities vary greatly in terms of the suitability of their environments for *** the factors that affect the environmental suitability,the LAI is important,with an increase in the LAI generally being *** contrast,an increase in the PM2.5 concentration is a key factor that limits the environmental suitability of an ***,urban landscaping and control of the atmospheric quality are essential and effective ways of improving the suitability of the environment of cities in China for tourists.

关键词： Suitability of tourist environment UTCI Delphi–AHP–TOPSIS decision support

来源：

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

The Spine of the Ancient Capital, the Backbone of Development, and the Pillar of Conservation An Analysis of the Cultural Value and Future Development of Beijing Central Axis as a World Cultural Heritage Site

引用

China & The World Cultural Exchange 2024年第9期 16-25页

作者： wu liyun Chen Hong the China Academy of Culture and Tourism Industry Beijing International Studies University School of Tourism Science Beijing International Studies University

Beijing Central Axis is the backbone of the ancient capital,a cultural spine shaped by the passage of time and spatial *** successful inscription as a World Heritage site presents new opportunities for the conservation of the Central Axis cultural heritage,while also offering a fresh chance to link cultural and tourism sites along the Axis,fostering coordinated development.

关键词： backbone offering passage

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：