In this paper, based on the conjugate of the complex basis function, a new complex variable moving least-squares approximation is discussed. Then using the new approximation to obtain the shape function, an improved c...In this paper, based on the conjugate of the complex basis function, a new complex variable moving least-squares approximation is discussed. Then using the new approximation to obtain the shape function, an improved complex variable element-free Galerkin（ICVEFG） method is presented for two-dimensional（2D） elastoplasticity problems. Compared with the previous complex variable moving least-squares approximation, the new approximation has greater computational precision and efficiency. Using the penalty method to apply the essential boundary conditions, and using the constrained Galerkin weak form of 2D elastoplasticity to obtain the system equations, we obtain the corresponding formulae of the ICVEFG method for 2D elastoplasticity. Three selected numerical examples are presented using the ICVEFG method to show that the ICVEFG method has the advantages such as greater precision and computational efficiency over the conventional meshless methods.展开更多
文章描述的A gent构建和学习环境(ABLE)是基于Java的A gent开发框架,用于开发和配置混合型智能A gent和A gent应用.它提供了一个可重用的组件库,包含:数据访取、机器学习、机器推理和优化算法,这些算法都以JavaBean形式打包,定义为A b l...文章描述的A gent构建和学习环境(ABLE)是基于Java的A gent开发框架,用于开发和配置混合型智能A gent和A gent应用.它提供了一个可重用的组件库,包含:数据访取、机器学习、机器推理和优化算法,这些算法都以JavaBean形式打包,定义为A b leBean,并提供了几种灵活的连接方法将A b leBean连接成一个软件A gent.此外,ABLE还提供了一个基于Sw ing的图形化用户接口,用户可以在图形界面上创建并配置A b leBean,并进一步构建和测试由这些A b leBean所构成的A gent.展开更多
—able(—ible)是英语中最常用的后缀之一。我们在阅读英语书刊或广告说明书等都会见到带后缀—able(—ible)的词,如:in every way possible(用各种可能的方法)comfortable living(舒适的生活),easily digestible(易于消化的),favourabl...—able(—ible)是英语中最常用的后缀之一。我们在阅读英语书刊或广告说明书等都会见到带后缀—able(—ible)的词,如:in every way possible(用各种可能的方法)comfortable living(舒适的生活),easily digestible(易于消化的),favourable,condition(有利的条件)等等。由于它的使用频率很高,故引起了英语研究者的注意。本文就—able(ible)这一后缀的意义、来源、构成词的形式,特征等作一初步探讨。展开更多
将曲形槽道人工钝头(Artificial Blunted Leading Edge,ABLE)概念应用于对称菱形翼中,针对飞行器可能出现的高空稀薄流流域进行分析,旨在探究ABLE概念在近空间稀薄流流域内的适用情况。利用直接模拟蒙特卡罗(DSMC)方法,对比分析了攻角为...将曲形槽道人工钝头(Artificial Blunted Leading Edge,ABLE)概念应用于对称菱形翼中,针对飞行器可能出现的高空稀薄流流域进行分析,旨在探究ABLE概念在近空间稀薄流流域内的适用情况。利用直接模拟蒙特卡罗(DSMC)方法,对比分析了攻角为0~10°下菱形翼与ABLE菱形翼的气动性能,并探讨了槽道构型参数对翼型气动性能的影响。结果表明,槽道参数设计合理时,ABLE概念能以较小的热流增量为代价显著提升翼型的升阻比,增升效果明显;与连续流情况下有明显差异,在稀薄流中,虽然槽道将前缘驻点高压区移除,但是由于槽道增加的湿润面积致使粘性阻力大幅度增加,导致ABLE概念翼型减阻性能不佳;除此之外,由于明显的稀薄气体效应,翼型气动力性能严重劣化。展开更多
英语情态动词一直以来被认为是"最重要、最难描写"的体系,准情态动词作为其中不可或缺的组成部分,具有形式多样、涵义丰富的特点,与核心情态动词相比,其使用率呈明显上升趋势。语料库及现代检索工具的出现为英语情态动词的研...英语情态动词一直以来被认为是"最重要、最难描写"的体系,准情态动词作为其中不可或缺的组成部分,具有形式多样、涵义丰富的特点,与核心情态动词相比,其使用率呈明显上升趋势。语料库及现代检索工具的出现为英语情态动词的研究提供了新的视角和手段。本文将研究对象转向准情态动词,以be able to为例,对其情态意义进行了界定辨析及历时研究,以期开拓情态动词研究的新局面。展开更多
We report a feasible method to realize tun able surface plasm on-polarit on(SPP)res onance in orga nic light-emitt ing devices(OLEDs)by emplo ying corrugated Ag-Al alloy electrodes.The excited SPP res onance in duced ...We report a feasible method to realize tun able surface plasm on-polarit on(SPP)res onance in orga nic light-emitt ing devices(OLEDs)by emplo ying corrugated Ag-Al alloy electrodes.The excited SPP res onance in duced by the periodic corrugations can be precisely tuned based on the composition ratios of the Ag-Al alloy electrodes.With an appropriate composition ratio of the corrugated alloy electrode,the photons trapped in SPP modes are recovered and extracted effectively.The 25%in creaseme nt in luminance and 21%enhan ceme nt in curre nt efficie ncy have bee n achieved by using the corrugated Ag-Al alloy electrodes in OLEDs.展开更多
The marine–continental transitional shale (MCTS) reservoirs of the Longtan Formation (LTF) are widely distributed in the Sichuan Basin. However, the LTF shale exhibits considerable variations in mineral composition a...The marine–continental transitional shale (MCTS) reservoirs of the Longtan Formation (LTF) are widely distributed in the Sichuan Basin. However, the LTF shale exhibits considerable variations in mineral composition and pore characteristics, which makes identifying the 'sweet spot'a challenging task. To address this issue, 10 samples from four typical shale gas wells in the LTF in the southern Sichuan Basin were selected and analyzed for total organic carbon (TOC) content, whole-rock composition using X-ray diffraction (XRD), low-pressure gas adsorption, and high-pressure mercury intrusion. The lithofacies distribution and pore structure of the MCTS were studied to determine the pore structural characteristics and the primary factors influencing pore formation in different types of shale lithofacies in the LTF. The lithofacies of the LTF shale in the study area can be classified into three categories: siliceous clay shale, clay shale and mixed shale. Mineral content has a significant impact on the pore characteristics, while TOC content has a minor effect on the pore volume and specific surface area of micropores and mesopores. It can be inferred that the mesopores in the MCTS are mainly related to clay mineral pores, and mineral dissolution and TOC content are not the primary factors contributing to pore formation.展开更多
In the data communication system,the real-time information interaction of communication device increases the risk of privacy sensitive data being tam-pered with.Therefore,maintaining data security is one of the most i...In the data communication system,the real-time information interaction of communication device increases the risk of privacy sensitive data being tam-pered with.Therefore,maintaining data security is one of the most important issues in network data communication.Because the timestamp is the most impor-tant way to authenticate data in information interaction,it is very necessary to pro-vide timestamp service in the data communication system.However,the existing centralized timestamp mechanism is difficult to provide credible timestamp ser-vice,and users can conspire with timestamping servers to forge timestamps.Therefore,this paper designs a distributed timestamp mechanism based on contin-uous verifiable delay functions.It utilizes multiple independent timestamp servers to provide timestamp services in a distributed model and appends the timestamp to the data once the data is generated.Thus,it can prove that the data already exists at a certain time and ensure the accuracy of the timestamp.Moreover,a digital blind signature based on elliptic curve cryptography is utilized to solve the problem of timestamp forgery in timestamp service.Finally,the security ana-lysis of the scheme ensures the data security of data communication system and the concurrency rate of timestamp.The experimental results also show that the scheme greatly improves the efficiency of digital signatures.展开更多
The IBM Agent Building and Learning Environment(ABLE) provides a lightweight Java^(TM) agent frame- work,a comprehensive JavaBeansTM library of intelligent software components,a set of development and test tools, and ...The IBM Agent Building and Learning Environment(ABLE) provides a lightweight Java^(TM) agent frame- work,a comprehensive JavaBeansTM library of intelligent software components,a set of development and test tools, and an agent platform.After the introduction to ABLE,classes and interfaces in the ABLE agent framework were put forward.At last an autonomic agent that is an ABLE-based architecture for incrementally building autonomic systems was discussed.展开更多
<strong>Purpose: </strong>This study aimed to understand the actual needs of empty-nest differently abled elderly people and analyze their long-term care status including the factors affecting choice of ca...<strong>Purpose: </strong>This study aimed to understand the actual needs of empty-nest differently abled elderly people and analyze their long-term care status including the factors affecting choice of care mode so adequate resources can be allocated to meet their healthcare needs. <strong>Methods:</strong> An empty-nest group was compared with a non-empty-nest group based on data from the 2014 Chinese Longitudinal Healthy Longevity Survey. Individual characteristics, family characteristics, and sociological factors were considered as independent variables, and long-term care model was the dependent variable in the three binary logistic regression method. <strong>Results:</strong> Age, gender, marriage, and disability were the most important factors influencing the choice of long-term care mode, including the willingness of the differently abled elderly. Family care can no longer meet the needs of the severely disabled elderly. Long-term care for such elderly people should be undertaken by professional and specialized social institutions. <strong>Conclusion: </strong>Multi-level services should be provided according to the elderly peoples’ needs, and the skill and expertise of professional personnel of care institutions should be strengthened. The government should deploy fund-raising initiatives, actively use the power of non-governmental organizations, and strive to resolve the financial issues faced by the empty-nested elderly people with disability.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11171208 and U1433104)
文摘In this paper, based on the conjugate of the complex basis function, a new complex variable moving least-squares approximation is discussed. Then using the new approximation to obtain the shape function, an improved complex variable element-free Galerkin（ICVEFG） method is presented for two-dimensional（2D） elastoplasticity problems. Compared with the previous complex variable moving least-squares approximation, the new approximation has greater computational precision and efficiency. Using the penalty method to apply the essential boundary conditions, and using the constrained Galerkin weak form of 2D elastoplasticity to obtain the system equations, we obtain the corresponding formulae of the ICVEFG method for 2D elastoplasticity. Three selected numerical examples are presented using the ICVEFG method to show that the ICVEFG method has the advantages such as greater precision and computational efficiency over the conventional meshless methods.
文摘文章描述的A gent构建和学习环境(ABLE)是基于Java的A gent开发框架,用于开发和配置混合型智能A gent和A gent应用.它提供了一个可重用的组件库,包含:数据访取、机器学习、机器推理和优化算法,这些算法都以JavaBean形式打包,定义为A b leBean,并提供了几种灵活的连接方法将A b leBean连接成一个软件A gent.此外,ABLE还提供了一个基于Sw ing的图形化用户接口,用户可以在图形界面上创建并配置A b leBean,并进一步构建和测试由这些A b leBean所构成的A gent.
文摘—able(—ible)是英语中最常用的后缀之一。我们在阅读英语书刊或广告说明书等都会见到带后缀—able(—ible)的词,如:in every way possible(用各种可能的方法)comfortable living(舒适的生活),easily digestible(易于消化的),favourable,condition(有利的条件)等等。由于它的使用频率很高,故引起了英语研究者的注意。本文就—able(ible)这一后缀的意义、来源、构成词的形式,特征等作一初步探讨。
文摘将曲形槽道人工钝头(Artificial Blunted Leading Edge,ABLE)概念应用于对称菱形翼中,针对飞行器可能出现的高空稀薄流流域进行分析,旨在探究ABLE概念在近空间稀薄流流域内的适用情况。利用直接模拟蒙特卡罗(DSMC)方法,对比分析了攻角为0~10°下菱形翼与ABLE菱形翼的气动性能,并探讨了槽道构型参数对翼型气动性能的影响。结果表明,槽道参数设计合理时,ABLE概念能以较小的热流增量为代价显著提升翼型的升阻比,增升效果明显;与连续流情况下有明显差异,在稀薄流中,虽然槽道将前缘驻点高压区移除,但是由于槽道增加的湿润面积致使粘性阻力大幅度增加,导致ABLE概念翼型减阻性能不佳;除此之外,由于明显的稀薄气体效应,翼型气动力性能严重劣化。
文摘英语情态动词一直以来被认为是"最重要、最难描写"的体系,准情态动词作为其中不可或缺的组成部分,具有形式多样、涵义丰富的特点,与核心情态动词相比,其使用率呈明显上升趋势。语料库及现代检索工具的出现为英语情态动词的研究提供了新的视角和手段。本文将研究对象转向准情态动词,以be able to为例,对其情态意义进行了界定辨析及历时研究,以期开拓情态动词研究的新局面。
基金This work was supported by the National Key Research and Development Program of China and the National Natural Science Foundation of China(NSFC)under Grants No.2020YFA0715000 and No.61825402.
文摘We report a feasible method to realize tun able surface plasm on-polarit on(SPP)res onance in orga nic light-emitt ing devices(OLEDs)by emplo ying corrugated Ag-Al alloy electrodes.The excited SPP res onance in duced by the periodic corrugations can be precisely tuned based on the composition ratios of the Ag-Al alloy electrodes.With an appropriate composition ratio of the corrugated alloy electrode,the photons trapped in SPP modes are recovered and extracted effectively.The 25%in creaseme nt in luminance and 21%enhan ceme nt in curre nt efficie ncy have bee n achieved by using the corrugated Ag-Al alloy electrodes in OLEDs.
基金supported by the National Natural Science Foundation of China(NNSFC)(Grant No.42272184)2022 Research Program of PetroChina Southwest Oil and Gas Field Company(2022JS-1809).
文摘The marine–continental transitional shale (MCTS) reservoirs of the Longtan Formation (LTF) are widely distributed in the Sichuan Basin. However, the LTF shale exhibits considerable variations in mineral composition and pore characteristics, which makes identifying the 'sweet spot'a challenging task. To address this issue, 10 samples from four typical shale gas wells in the LTF in the southern Sichuan Basin were selected and analyzed for total organic carbon (TOC) content, whole-rock composition using X-ray diffraction (XRD), low-pressure gas adsorption, and high-pressure mercury intrusion. The lithofacies distribution and pore structure of the MCTS were studied to determine the pore structural characteristics and the primary factors influencing pore formation in different types of shale lithofacies in the LTF. The lithofacies of the LTF shale in the study area can be classified into three categories: siliceous clay shale, clay shale and mixed shale. Mineral content has a significant impact on the pore characteristics, while TOC content has a minor effect on the pore volume and specific surface area of micropores and mesopores. It can be inferred that the mesopores in the MCTS are mainly related to clay mineral pores, and mineral dissolution and TOC content are not the primary factors contributing to pore formation.
基金supported by National Key R&D Program of China(Grant Nos.2021YF B2700503,2020YF B1005900)supported by the National Natural Science Foundation of China(No.62072249)。
文摘In the data communication system,the real-time information interaction of communication device increases the risk of privacy sensitive data being tam-pered with.Therefore,maintaining data security is one of the most important issues in network data communication.Because the timestamp is the most impor-tant way to authenticate data in information interaction,it is very necessary to pro-vide timestamp service in the data communication system.However,the existing centralized timestamp mechanism is difficult to provide credible timestamp ser-vice,and users can conspire with timestamping servers to forge timestamps.Therefore,this paper designs a distributed timestamp mechanism based on contin-uous verifiable delay functions.It utilizes multiple independent timestamp servers to provide timestamp services in a distributed model and appends the timestamp to the data once the data is generated.Thus,it can prove that the data already exists at a certain time and ensure the accuracy of the timestamp.Moreover,a digital blind signature based on elliptic curve cryptography is utilized to solve the problem of timestamp forgery in timestamp service.Finally,the security ana-lysis of the scheme ensures the data security of data communication system and the concurrency rate of timestamp.The experimental results also show that the scheme greatly improves the efficiency of digital signatures.
文摘The IBM Agent Building and Learning Environment(ABLE) provides a lightweight Java^(TM) agent frame- work,a comprehensive JavaBeansTM library of intelligent software components,a set of development and test tools, and an agent platform.After the introduction to ABLE,classes and interfaces in the ABLE agent framework were put forward.At last an autonomic agent that is an ABLE-based architecture for incrementally building autonomic systems was discussed.
文摘<strong>Purpose: </strong>This study aimed to understand the actual needs of empty-nest differently abled elderly people and analyze their long-term care status including the factors affecting choice of care mode so adequate resources can be allocated to meet their healthcare needs. <strong>Methods:</strong> An empty-nest group was compared with a non-empty-nest group based on data from the 2014 Chinese Longitudinal Healthy Longevity Survey. Individual characteristics, family characteristics, and sociological factors were considered as independent variables, and long-term care model was the dependent variable in the three binary logistic regression method. <strong>Results:</strong> Age, gender, marriage, and disability were the most important factors influencing the choice of long-term care mode, including the willingness of the differently abled elderly. Family care can no longer meet the needs of the severely disabled elderly. Long-term care for such elderly people should be undertaken by professional and specialized social institutions. <strong>Conclusion: </strong>Multi-level services should be provided according to the elderly peoples’ needs, and the skill and expertise of professional personnel of care institutions should be strengthened. The government should deploy fund-raising initiatives, actively use the power of non-governmental organizations, and strive to resolve the financial issues faced by the empty-nested elderly people with disability.
