34 research outputs found
Analysis of Intelligent Living for Elderly in Smart Aging
This paper conducts an in-depth investigation into smart home systems and their developmental trajectory. It systematically dissects the constituent elements of smart homes, encompassing the perception layer, transmission layer, platform layer, and application layer. The paper analyzes the intelligent living forms and types for elderly individuals at home, including environmentally proactive monitoring and types of intelligent living such as life assistance, health and safety, and leisure and entertainment. The research explores interaction modes in smart home systems, incorporating mechanical interaction, voice interaction, and screen interaction. It underscores the significance of screen interaction as a primary control method in the intelligent living of elderly individuals at home. This paper provides profound theoretical foundations and practical guidance for the intelligent living of elderly individuals at home
Influence of welding quality on stability of SUS304 tube-compression by viscous pressure forming
One of the major problems affecting viscous
pressure forming (VPF) is the stability of tubecompression,
whereas the main defect influencing
the stability of welded tube-compression is the
quality of welded joints. This article utilizes the
finite element method to analyze the influence of
weld joint strength and width on stability of
SUS304 tube-compression by VPF. Meanwhile,
SUS304 welded tube-blanks with different weld
joint strength and width are obtained by plasma
welding, TIG-Tungsten Inert Gas welding, laser
welding and high frequency welding and then the
stability test by VPF is carried out. The results
showed that the weld joint strength and width
affect the stability of tube-compression. The system
and process of controlling weld joint width can
improve the stability of tube-blank preferably
relative to weld joint strength
Diffusion of Colloidal Rods in Corrugated Channels
In many natural and artificial devices diffusive transport takes place in
confined geometries with corrugated boundaries. Such boundaries cause both
entropic and hydrodynamic effects, which have been studied only for the case of
spherical particles. Here we experimentally investigate diffusion of particles
of elongated shape confined into a corrugated quasi-two-dimensional channel.
Elongated shape causes complex excluded-volume interactions between particle
and channel walls which reduce the accessible configuration space and lead to
novel entropic free energy effects. The extra rotational degree of freedom also
gives rise to a complex diffusivity matrix that depends on both the particle
location and its orientation. We further show how to extend the standard
Fick-Jacobs theory to incorporate combined hydrodynamic and entropic effects,
so as, for instance, to accurately predict experimentally measured mean first
passage times along the channel. Our approach can be used as a generic method
to describe translational diffusion of anisotropic particles in corrugated
channels.Comment: 12 pages and 4 figure
Influence of welding quality on stability of SUS304 tube-compression by viscous pressure forming
One of the major problems affecting viscous
pressure forming (VPF) is the stability of tubecompression,
whereas the main defect influencing
the stability of welded tube-compression is the
quality of welded joints. This article utilizes the
finite element method to analyze the influence of
weld joint strength and width on stability of
SUS304 tube-compression by VPF. Meanwhile,
SUS304 welded tube-blanks with different weld
joint strength and width are obtained by plasma
welding, TIG-Tungsten Inert Gas welding, laser
welding and high frequency welding and then the
stability test by VPF is carried out. The results
showed that the weld joint strength and width
affect the stability of tube-compression. The system
and process of controlling weld joint width can
improve the stability of tube-blank preferably
relative to weld joint strength
Dynamic random testing of web services: a methodology and evaluation
In recent years, Service Oriented Architecture (SOA) has been increasingly adopted to develop distributed applications in the context of the Internet. To develop reliable SOA-based applications, an important issue is how to ensure the quality of web services. In this paper, we propose a dynamic random testing (DRT) technique for web services, which is an improvement over the widely-practiced random testing (RT) and partition testing (PT). We examine key issues when adapting DRT to the context of SOA, including a framework, guidelines for parameter settings, and a prototype for such an adaptation. Empirical studies are reported where DRT is used to test three real-life web services, and mutation analysis is employed to measure the effectiveness. Our experimental results show that, compared with the three baseline techniques, RT, Adaptive Testing (AT) and Random Partition Testing (RPT), DRT demonstrates higher fault-detection effectiveness with a lower test case selection overhead. Furthermore, the theoretical guidelines of parameter setting for DRT are confirmed to be effective. The proposed DRT and the prototype provide an effective and efficient approach for testing web services. IEE
Quantum Stress: Density Functional Theory Formulation and Physical Manifestation
The concept of "quantum stress (QS)" is introduced and formulated within
density functional theory (DFT), to elucidate extrinsic electronic effects on
the stress state of solids and thin films in the absence of lattice strain. A
formal expression of QS (\sigma^Q) is derived in relation to deformation
potential of electronic states ({\Xi}) and variation of electron density
({\Delta}n), \sigma^Q = {\Xi}{\Delta}n, as a quantum analog of classical Hook's
law. Two distinct QS manifestations are demonstrated quantitatively by DFT
calculations: (1) in the form of bulk stress induced by charge carriers; and
(2) in the form of surface stress induced by quantum confinement. Implications
of QS in some physical phenomena are discussed to underlie its importance.Comment: 5 pages, 4 figure
Mixed-flow pump performance improvement based on circulation method
Mixed-flow pumps have been extensively employed in daily life, improving their energy characteristics contribute to the reduction of energy consumption worldwide. In this study, to overcome the decrease of optimization upper limit caused by using a single type of parameter as the design parameter, a typical mixed-flow pump was chosen for study, and its impeller was parameterized by five geometric and eight hydrodynamic parameters. With head and efficiency as the constraint and optimization objective respectively, 27 schemes were constructed by the Taguchi method. The influence of design factors to the objective and constraint was analyzed based on range and regression analysis. The optimization mechanism was elucidated using the entropy production method. The result reveals that the geometric and hydrodynamic parameters have a significantly impact on the mixed-flow pump’s energy characteristics. The optimized model head is 12.43m, which meets the constraints, while the efficiency increases by 3.2%–88.51%. Therefore, considering both geometric and hydrodynamic parameters in the mixed-flow pump optimization is workable and necessary. This paper can provide practical instructions on the optimal design of different turbomachines