The COVID-19 outbreak stands as one of the most significant global health crises in recent memory, claiming millions of lives worldwide. The urgent and precise identification of the disease holds paramount importance ...
详细信息
As the big data era transforms the information analysis landscape, social network (SN) analytics has emerged as a critical discipline to understand complex relationships and interactions within enormous social systems...
详细信息
Eurocode 8 (Part 1) and Indian Standard IS 1893 (Part 1) recommend accounting for the impact of vertical earthquakes on structures with large overhangs, but they do not provide specific guidance for modeling large ove...
详细信息
Eurocode 8 (Part 1) and Indian Standard IS 1893 (Part 1) recommend accounting for the impact of vertical earthquakes on structures with large overhangs, but they do not provide specific guidance for modeling large overhang reinforced concrete (RC) planar frames, particularly regarding the representation of vertical masses during vertical seismic events. This paper quantifies the modeling of vertical masses in large overhang RC planar frames subjected to Vertical Ground Motion (VGM) using eight near-fault seismic excitations in SAP2000 software. At first, a modal analysis was performed to determine the horizontal and vertical time periods of the large overhang RC planar frames. The nonlinear time-history analysis utilized both the horizontal earthquake component and the combined horizontal and vertical components. In accordance with ASCE 7-05 and ATC-63 standards, eight near-fault earthquake records were selected from the PEER NGA database, comprising four pulse-type and four non-pulse-type seismic excitations. The response of the large overhang RC planar frames was evaluated using parameters such as vertical displacement, column axial force, base shear, and base moments. Furthermore, a methodology has been proposed for the identification of critical parameters for large overhang RC planar frames subjected to vertical ground motion (VGM). Additionally, a parametric study has been conducted on single-story to four-story large overhang RC planar frames using twelve non-pulse near-fault vertical earthquake events. The critical earthquake-related parameters selected include the vertical peak ground acceleration, the horizontal peak ground acceleration, the vertical-to-horizontal peak ground acceleration ratio, the predominant spectral time period for vertical ground acceleration, and the predominant spectral time period for horizontal ground acceleration. The structure-related critical parameters considered are vertical displacement at top joints, axial force, base shear
This paper presents a controller for fast and ultrafast electric vehicle(EV)charging *** affecting the charging efficiency,the proposed controller enables the charger to provide support to the interconnection voltage ...
详细信息
This paper presents a controller for fast and ultrafast electric vehicle(EV)charging *** affecting the charging efficiency,the proposed controller enables the charger to provide support to the interconnection voltage to counter and damp its *** solutions are either hardware-based such as using supercapacitors and flywheels which increase the cost and bulkiness of the charging station,or software-based such as P/V droop methods which are still unable to provide a robust and strong voltage *** paper proposes an emulated supercapacitor concept in the control system of the ultra-fast EV charger in an islanded DC ***,it converts the EV from a static load to a bus voltage supportive load,leading to reduced bus voltage oscillations during single and multiple ultra-fast EV charging operations,and rides through and provides supports during extreme external *** analysis and design guidelines of the proposed controller are presented,and its effectiveness and improved performance compared with conventional techniques are shown for different case studies.
For the traditional peak-aged (PA) AA2024 alloy, the formation of large S-phase precipitates within the grains, wide precipitate-free zones (PFZs) near the grain boundaries (GBs), and continuous distribution of grain ...
详细信息
For the traditional peak-aged (PA) AA2024 alloy, the formation of large S-phase precipitates within the grains, wide precipitate-free zones (PFZs) near the grain boundaries (GBs), and continuous distribution of grain boundary precipitates (GBPs) can be observed. As a result, the PA alloy exhibits relatively high strength but poor corrosion resistance. However, with the application of cyclic plasticity treatment, high-density 1–2 nm clusters form within the matrix, and no PFZs form near GBs. In this study, this treatment yields the optimal balance between strength–elongation characteristics and corrosion resistance. By combining cyclic plasticity and ageing heat treatment with different heating rates, the nanoscale clusters play a crucial role as heterogeneous nucleation sites, resulting in the formation of finer and higher number density of S precipitates within the matrix. Additionally, the presence of these clusters reduces the formation of GBPs and minimizes the width of PFZs. Consequently, compared to the traditional PA sample, this approach achieves a significantly higher yield strength (increased by 46 %) and ultimate tensile strength (increased by 18 %), along with superior corrosion resistance. Although the influence of ageing heat treatment with different rates on mechanical properties is not significant, it notably affects the formation of GBPs and corrosion resistance. Specifically, a slower heating rate leads to an increase in the spacing between adjacent GBPs, resulting in improved corrosion resistance. In summary, cyclic strengthening, as a novel method for alloy strengthening, when combined with ageing heat treatment, modulates the distribution of S precipitates within the matrix and GBs. This optimization maximizes the effects of precipitation strengthening and breaks the inverse relationship between strength and corrosion resistance.
In this study, a fuzzy reinforcement learning control (FRLC) is proposed to achieve trajectory tracking of a differential drive mobile robot (DDMR). The proposed FRLC approach designs fuzzy membership functions to fuz...
详细信息
Collision prevention through avoiding obstacles is crucial for autonomous navigation. Many works have been done to improve the techniques for detecting obstacles and facilitate autonomous navigation. However, the tech...
详细信息
Bangladesh lies at the downstream of GBM basin which carries a large number of sediments through its river network which changes the morphological characteristics of rivers. Bishkhali River also experiences morphologi...
详细信息
ISBN:
(数字)9789819938261
ISBN:
(纸本)9789819938254
Bangladesh lies at the downstream of GBM basin which carries a large number of sediments through its river network which changes the morphological characteristics of rivers. Bishkhali River also experiences morphological changes throughout time. Bishkhali River is located at the south-central region of Bangladesh and discharges directly into the Bay of Bengal. Being a tidal river, its morphological characteristics are governed not only by the changes in flow from upstream but also by the impact of sea-level and tidal characteristics of the Bay of Bengal. Bishkhali River is mainly known for its bank erosion, bar formation, and shifting of thalwegs. This study is aimed at planform analysis and channel bar analysis for the period between 1995 to 2020. This study also includes thalweg analysis for the time period from 2002 to 2020 (based on the availability of cross-sectional data). For the estimation of erosion-accretion along both right-bank, left-bank, and channel bar analysis, LANDSAT images have been collected from USGS (United States Geological Survey) and these two analyses have been conducted by using GIS. Also, for thalweg analysis, historical cross-sectional data has been collected from BWDB (Bangladesh Water Development Board) and this analysis has been performed by using Microsoft Excel and GIS. It has been found from the planform analysis that total erosion and accretion for the right bank from 1995 to 2020 are 1073.68 and 664.61 ha, respectively. Also, for the left bank, total erosion and accretion from 1995 to 2020 were 1062.50 and 831.82 ha. From channel bar analysis, maximum areas for both bars situated near Ramna Launch Ghat and Kalikabari have been recorded in 2020, and these are 105.15 and 74.66 ha, respectively. From thalweg analysis, at (Rajapur Upazila, Daskinpara, Kalikabari, Mar bazar, Patharghata Upazila) stations, thalwegs are shifting towards the left bank, at (Aurabunia Bazar, Kathalia Launch Ghat, Karuna Khal, Patharghata Upazila) stations,
The growth of the Internet of Things (IoT) sector has ushered in an unprecedented era of connectedness, enabling a profusion of applications ranging from smart homes to industrial automation. Researchers predict that ...
详细信息
This paper presents a novel, low-cost, wearable Optical Character Recognition (OCR) reading assistant glasses designed for the low-vision and visually impaired community. This standalone system uses a Radxa Zero 3W si...
详细信息
暂无评论