期刊文献+
共找到497篇文章
< 1 2 25 >
每页显示 20 50 100
Experimental Study on Interference Effect of Three Risers Arranged in Tandem with Variable Spacing Ratios
1
作者 ZHANG Peng LIU Li-hua +2 位作者 LIU Ming REN Xiao-hui WANG Yu 《China Ocean Engineering》 SCIE EI CSCD 2023年第3期408-419,共12页
Taking the three-riser group arranged in tandem as the research subject,an experimental study was carried out on the risers arranged in tandem.The purpose is to explore the sensitivity of the dynamic response of each ... Taking the three-riser group arranged in tandem as the research subject,an experimental study was carried out on the risers arranged in tandem.The purpose is to explore the sensitivity of the dynamic response of each riser to spacing ratio and reveal the physical mechanism of riser groups under the interference effect.The spacing ratios of the adj acent risers are 4.0,5.0,6.0,and 8.0.At the spacing between the risers of 4.0D,the strong feedback effect increases the cross-flow(CF) displacement amplitude of the upstream riser.The shielding effect is the key factor affecting the interference effect on the midstream and downstream risers.At low reduced velocities,the shielding area initially appears,the displacement amplitude of the midstream and downstream risers varies greatly,the vibration of the two risers is still dominated by the first-order mode,and the transition between adjacent vibration modes is restrained.The multi-frequency superposition phenomenon is very significant at high reduced velocities.The most sensitive interference spacing under the test conditions is obtained.Due to the separation of the incoming flow and the double shielding effect of the upstream and midstream risers,the regular vortex-induced vibration in the wake area of the downstream riser is broken,and the vibration in the two directions is weakened.In general,the interference effect is more significant for the CF vibration of the three-riser groups than the in-line(IL) vibration. 展开更多
关键词 three-riser group tandem arrangement vortex-induced vibration wake interference variable spacing ratios
下载PDF
LARGE EDDY SIMULATION AND SPECTRUM ANALYSIS OF FLOW AROUND TWO SQUARE CYLINDERS ARRANGED SIDE BY SIDE
2
作者 魏英杰 朱蒙生 何钟怡 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第8期903-910,共8页
Large eddy simulation cooperated with the second order full extension ETG(Euler-Taylor-Galerkin) finite element method was applied to simulate the flow around two square cylinders arranged side by side at a spacing ra... Large eddy simulation cooperated with the second order full extension ETG(Euler-Taylor-Galerkin) finite element method was applied to simulate the flow around two square cylinders arranged side by side at a spacing ratio of (1.5.) The second order full extension ETG finite element method was developed by Wang and He. By means of Taylor expansion of terms containing time derivative, time derivative is replaced by space derivative. The function of it is equal to introducing an artificial viscosity term. The streamlines of the flow at different moments were obtained. The time history of drag coefficient, lift coefficient and the streamwise velocity on the symmetrical points were presented. Furthermore, the symmetrical problem of the frequency spectrum of flow around two square cylinders arranged side by side were studied by using the spectral analysis technology. The data obtained at the initial stage are excluded in order to avoid the influence of initial condition on the results. The power spectrums of drag coefficient, lift coefficient, the streamwise velocity on the symmetrical points were analyzed respectively. The results show that although the time domain process of dynamic parameters is non-symmetrical, the frequency domain process of them is symmetrical under the symmetrical boundary conditions. 展开更多
关键词 two square cylinders arranged side by side symmetrical flow around body spectrum analysis large eddy simulation ETG finite element drag coefficient lift coefficient
下载PDF
Designing and characteristics analysis of electric suspensions with symmetrically arranged two slider-rods
3
作者 WANG Guo-sheng LEI Qiang-shun +1 位作者 SONG Hui-xin JIN Hao-long 《Journal of Beijing Institute of Technology》 EI CAS 2016年第3期309-315,共7页
An innovative design of electric suspensions was developed in this study to help realize slow active suspension easily and quickly.This design was driven by screw through double slider-rod arranged symmetrically as a ... An innovative design of electric suspensions was developed in this study to help realize slow active suspension easily and quickly.This design was driven by screw through double slider-rod arranged symmetrically as a substitute for two springs.Based on a mathematical modeling,suspension parameters were introduced for a certain type of wheeled vehicles.The functions and its mechanism in regulating terrain clearance and adjusting attitudes were subsequently explained respectively,together with its semi-active control mechanism and characteristics In conclusion,our data in the study show that the new mechanical design of suspensions not only could realize adjusting terrain clearance and static vehicle pose,but also had an ideal stiffness that could realize a semi-active suspension function through adjusting suspension's stiffness.Therefore it can bequite suitable for off-road wheeled vehicles and military wheeled vehicles. 展开更多
关键词 suspension mechanism slider-link arranged symmetrically adjustable stiffness electric control semi-active suspension low active control
下载PDF
CLINICAL OBSERVATION ON POSTHERPETIC NEURALGIA OF HIV CARRIERS TREATED WITH ARRANGED ELECTRO ACUPUNCTURE
4
作者 李敏 《World Journal of Acupuncture-Moxibustion》 2000年第1期51-53,共3页
cases of postherpetic neuralgia were treated with arranged electro acupuncture and 30 cases with medicine as control. All cases were HIV carriers. The 6 point behavioral rating scale (BRS 6) was used to observe the ef... cases of postherpetic neuralgia were treated with arranged electro acupuncture and 30 cases with medicine as control. All cases were HIV carriers. The 6 point behavioral rating scale (BRS 6) was used to observe the effect before and after treatment. The results indicate arranged electro acupuncture can cure or reduce the severe pain of postherpetic neuralgia of HIV carriers and the effect was better than medicine. 展开更多
关键词 arranged electro acupuncture Postherpetic neuralgia 6 point behavioral rating scales(BRS 6)
下载PDF
NUMERICAL COMPUTATION OF THE FLOW AROUND TWO SQUARE CYLINDERS ARRANGED SIDE-BY-SIDE 被引量:1
5
作者 陈素琴 顾明 黄自萍 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2000年第2期147-164,共18页
The numerical method is used to calculate the flow around two square cylinders arranged side-by-side and the mean and fluctuating aerodynamic forces, and Strouhal numbers and power spectrum of lift force and drag forc... The numerical method is used to calculate the flow around two square cylinders arranged side-by-side and the mean and fluctuating aerodynamic forces, and Strouhal numbers and power spectrum of lift force and drag force are obtained. An improved MAC method proposed by Chen Suqin et al.,which uses three order upwind scheme to discretize the convection term and uses multigrid method to solve the Poisson equation for pressure is applied to simulate the flow around two square cylinders arranged side-by-side. Results show that the interference characteristic of two square cylinders arranged side-by-side is completely different with the different spacing ratio. When the spacing ratio is smaller than a certain critical value, the gap flow between two cylinders is biased to one side in a stable or unstable manner. 展开更多
关键词 wake interference square cylinders in side-by-side arrangement N-S equations MAC method
下载PDF
Enhance gas-separation efficiency of mixed matrix membranes by lamellarly arranged metal-organic polyhedron 被引量:1
6
作者 Yida Yang Bowen Pang +5 位作者 Wang Zeng Bingxu Ma Panchao Yin Shenglin Yao Xiufang Wen Wei Zhang 《Nano Research》 SCIE EI CSCD 2023年第8期11450-11454,共5页
Eliminating the nonselective permeation path inside the mixed-matrix membranes(MMMs)is critical for fabrication of gas separation membranes.We demonstrate that by utilizing the phase separation of block copolymers,we ... Eliminating the nonselective permeation path inside the mixed-matrix membranes(MMMs)is critical for fabrication of gas separation membranes.We demonstrate that by utilizing the phase separation of block copolymers,we are able to introduce metal-organic polyhedrons(MOPs)with precise pore sizes into a polymer matrix and form an ordered layered structure.We also prove that,by arranging MOP cages into a continuous nanosheet-like layer structure,we are able to generate repeated MOP-effective pathways and deplete the MOP-free permeation pathways,thus enhancing the gas-separation efficiency of MMMs. 展开更多
关键词 metal-organic polyhedrons(MOPs) mixed-matrix membranes(MMMs) phase separation of mixed-matrix membranes arrangement of MOPs
原文传递
High Density 3D Carbon Tube Nanoarray Electrode Boosting the Capacitance of Filter Capacitor
7
作者 Gan Chen Fangming Han +6 位作者 Huachun Ma Pei Li Ziyan Zhou Pengxiang Wang Xiaoyan Li Guowen Meng Bingqing Wei 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第11期242-254,共13页
Electric double-layer capacitors(EDLCs)with fast frequency response are regarded as small-scale alternatives to the commercial bulky aluminum electrolytic capacitors.Creating carbon-based nanoarray electrodes with pre... Electric double-layer capacitors(EDLCs)with fast frequency response are regarded as small-scale alternatives to the commercial bulky aluminum electrolytic capacitors.Creating carbon-based nanoarray electrodes with precise alignment and smooth ion channels is crucial for enhancing EDLCs’performance.However,controlling the density of macropore-dominated nanoarray electrodes poses challenges in boosting the capacitance of line-filtering EDLCs.Herein,a simple technique to finely adjust the vertical-pore diameter and inter-spacing in three-dimensional nanoporous anodic aluminum oxide(3D-AAO)template is achieved,and 3D compactly arranged carbon tube(3D-CACT)nanoarrays are created as electrodes for symmetrical EDLCs using nanoporous 3D-AAO template-assisted chemical vapor deposition of carbon.The 3D-CACT electrodes demonstrate a high surface area of 253.0 m^(2) g^(−1),a D/G band intensity ratio of 0.94,and a C/O atomic ratio of 8.As a result,the high-density 3D-CT nanoarray-based sandwich-type EDLCs demonstrate a record high specific areal capacitance of 3.23 mF cm^(-2) at 120 Hz and exceptional fast frequency response due to the vertically aligned and highly ordered nanoarray of closely packed CT units.The 3D-CT nanoarray electrode-based EDLCs could serve as line filters in integrated circuits,aiding power system miniaturization. 展开更多
关键词 Compactly arranged Three-dimensional carbon tube nanoarray Dimensional carbon tube nanoarray Fast frequency response Electric double-layer capacitors Layer capacitors AC line-filtering FILTERING
下载PDF
In-situ study of the microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation technique
8
作者 Jeno Gubicza Kristián Máthis +7 位作者 Péter Nagy Péter Jenei Zoltán Hegedus Andrea Farkas Jozef Vesely Shin-ichi Inoue Daria Drozdenko Yoshihito Kawamura 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第5期2024-2040,共17页
Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application potential.This material has a bimodal microstructure... Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application potential.This material has a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(LPSO)phase.In order to reveal the deformation mechanisms,in-situ synchrotron X-ray diffraction line profile analysis was employed for a detailed study of the dislocation arrangement created during tension in Mg-0.9%Zn-2.05%Y-0.15%Al(at%)alloy.For uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by annealing of the as-consolidated specimen at 300 and 400℃ for 2 h.The heat treatment at 300℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile loading.On the other hand,annealing at 400℃ resulted in a significant increase of the recrystallized grains fraction and a decrease of the dislocation density,leading to only minor degradation of the mechanical strength.The maximum dislocation density at the failure of the samples corresponding to the plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal and pyramidal types,what was also in agreement with the Schmid factor values revealed independently from orientation maps.It was also shown that the dislocation-induced Taylor hardening was much lower below the plastic strain of 3% than above this value,which was explained by a model of the interaction between prismatic dislocations and CANaPs/LPSO plates. 展开更多
关键词 Mg-Zn-Y-Al alloy Long period stacking ordered(LPSO)phase Cluster arranged nanoplates(CANaPs) Annealing Tension Dislocation density Hardening
下载PDF
Electricity Generation from Heatwaves
9
作者 Diandong Ren Mervyn J. Lynch 《International Journal of Geosciences》 CAS 2024年第5期449-457,共9页
We chose a definition of heatwaves (HWs) that has ~4-year recurrence frequency at world hot spots. We first examined the 1940-2022 HWs climatology and trends in lifespan, severity, spatial extent, and recurrence frequ... We chose a definition of heatwaves (HWs) that has ~4-year recurrence frequency at world hot spots. We first examined the 1940-2022 HWs climatology and trends in lifespan, severity, spatial extent, and recurrence frequency. HWs are becoming more frequent and more severe for extratropical mid- and low-latitudes. To euphemize HWs, we here propose a novel clean energy-tapping concept that utilizes the available nano-technology, micro-meteorology knowledge of temperature distribution within/without buildings, and radiative properties of earth atmosphere. The key points for a practical electricity generation scheme from HWs are defogging, insulation, and minimizing the absorption of infrared downward radiation at the cold legs of the thermoelectric generators. One sample realization is presented which, through relay with existing photovoltaic devices, provides all-day electricity supply sufficient for providing air conditioning requirement for a residence (~2000-watt throughput). The provision of power to air conditioning systems, usually imposes a significant stress on traditional city power grids during heatwaves. 展开更多
关键词 Heatwaves Climate Warming Clean Energy Generation by Thermoelectric Generator Ameliorate and Transcend Heatwaves Climate Warming Mitigation and Adaptation Thermoelectric Generator (TEG) IR Interaction with Periodically arranged Nanostructures Optical Properties of Nano Fabricating Passive Clean Energy Tapping/Generation
下载PDF
Design and Optimization of Tandem Arranged Cascade in a Transonic Compressor 被引量:7
10
作者 YUE Shaoyuan WANG Yangang WANG Haitong 《Journal of Thermal Science》 SCIE EI CAS CSCD 2018年第4期349-358,共10页
This study proposed a design and optimization strategy for a tandem arranged cascade using the Non-dominated Sorting Genetic Algorithm(NSGA) Ⅱ multi-objective optimization algorithm and Back Propagation(BP) neural ne... This study proposed a design and optimization strategy for a tandem arranged cascade using the Non-dominated Sorting Genetic Algorithm(NSGA) Ⅱ multi-objective optimization algorithm and Back Propagation(BP) neural network technology. The NASA Stage 35 was employed as the initial bench mark in the present study and five geometric control parameters were working as the optimization parameters aiming to enhance the aerodynamic performance in terms of total pressure rise and efficiency. Results showed that the feasibility and capability of the proposed optimization strategy was successfully examined. In view of the fact that the initial tandem cascade(directly scaling down from NASA Stage 35) cannot guarantee the aerodynamic performance, first optimization trial was conducted to optimize the initial design. Results showed that the optimum can improve the flow quality whereas the separation on the blade is decayed or even eliminated particularly at the tip and root regions. However, compared with the initial tandem design, the enhancement in total pressure ratio(0.47%) and efficiency(1%) are too small to be noticed. Second investigation was particularly emphasizing on a high turning tandem compressor with an increment by 28°. The pressure rise and efficiency were augmented by 1.44% and 2.34%(compared to the initial tandem design), respectively. An important conclusion can be drawn that the optimization strategy is worthy to be used in high turning compressors with a considerable performance improvement. 展开更多
关键词 NSGA genetic algorithm BP neural network optimization tandem arranged cascade
原文传递
Finite element prediction on the response of non-uniformly arranged pile groups considering progressive failure of pile-soil system 被引量:2
11
作者 Qian-Qing ZHANG Shan-Wei LIU +2 位作者 Ruo-Feng FENG Jian-Gu QIAN Chun-Yu CUI 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2020年第4期961-982,共22页
A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation,and basin-shaped settlement is often observed in practice.Large differential settlement of pile groups will decre... A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation,and basin-shaped settlement is often observed in practice.Large differential settlement of pile groups will decrease the use-safety requirements of building,even cause the whole-building tilt or collapse.To reduce differential settlement among individual piles,non-uniformly arranged pile groups can be adopted.This paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile groups.Using the userdefined subroutine FRIC as the secondary development platform,a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS software.As to the response analysis of a single pile,the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer program.The reinforcing effects of individual piles is then analyzed using the present finite element analysis.Furthermore,the response of non-uniformly arranged pile groups,e.g.,individual piles with variable length and individual piles with variable diameter,is analyzed using the proposed numerical analysis method.Some suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes. 展开更多
关键词 numerical simulation non-uniformly arranged pile groups differential settlement pile-soil interaction
原文传递
Soybean maize strip intercropping:A solution for maintaining food security in China
12
作者 Jiang Liu Wenyu Yang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第7期2503-2506,共4页
The practice of intercropping leguminous and gramineous crops is used for promoting sustainable agriculture,optimizing resource utilization,enhancing biodiversity,and reducing reliance on petroleum products.However,pr... The practice of intercropping leguminous and gramineous crops is used for promoting sustainable agriculture,optimizing resource utilization,enhancing biodiversity,and reducing reliance on petroleum products.However,promoting conventional intercropping strategies in modern agriculture can prove challenging.The innovative technology of soybean maize strip intercropping(SMSI)has been proposed as a solution.This system has produced remarkable results in improving domestic soybean and maize production for both food security and sustainable agriculture.In this article,we provide an overview of SMSI and explain how it differs from traditional intercropping.We also discuss the core principles that foster higher yields and the prospects for its future development. 展开更多
关键词 strip intercropping food security SOYBEAN MAIZE spatial arrangement
下载PDF
Experimental Study on Vortex-Induced Vibration of Rough Risers with Coupling Interference Effect Under Side-by-Side Arrangement
13
作者 HU Ze-bo LIU Zhen +5 位作者 LI Peng GUO Hai-yan WANG Shu-bing REN Xiao-hui HOU Hao WANG Ye-shuo 《China Ocean Engineering》 SCIE EI CSCD 2024年第1期18-28,共11页
A vortex-induced vibration(VIV)experiment of rough risers with coupling interference effect under a side-by-side arrangement was carried out in a wave-current combined flume.The roughness of the riser was characterize... A vortex-induced vibration(VIV)experiment of rough risers with coupling interference effect under a side-by-side arrangement was carried out in a wave-current combined flume.The roughness of the riser was characterized by arranging different specifications of surface attachments on the surface of the riser.Rough risers with three different roughnesses were arranged side by side with smooth risers to explore the VIV response of the riser under the combined action of roughness and interference effect,and to reveal the coupling mechanism between roughness and interference effect.The experimental results show that,compared with that of a smooth riser,the VIV of a rough riser under the coupling interference effect has a wider"lock-in"region,and the displacement decreases more significantly at a high reduced velocity,which is more likely to excite higher-order modes and frequency responses.In addition,the displacement response and frequency response of the smooth riser are not significantly affected by wake interference from the rough riser,which is caused by the decrease of the wake region due to the delay of the boundary layer separation point of the rough riser. 展开更多
关键词 marine riser vortex-induced vibration side-by-side arrangement ROUGHNESS interference effect
下载PDF
Experimental Study on Vortex-Induced Vibration of Rough Risers Coupling with Interference Effect in Tandem Arrangement
14
作者 HU Ze-bo LIU Zhen +4 位作者 LI Peng GUO Hai-yan REN Xiao-hui HOU Hao HAO Lian-hong 《China Ocean Engineering》 SCIE EI CSCD 2024年第3期394-407,共14页
In order to study the response law of vortex-induced vibration(VIV)of marine risers under the combined action of roughness and interference effects,and to reveal the coupling mechanism of roughness and interference ef... In order to study the response law of vortex-induced vibration(VIV)of marine risers under the combined action of roughness and interference effects,and to reveal the coupling mechanism of roughness and interference effects on the riser,a VIV experiment of rough risers in tandem arrangement was conducted in a wave−current combined flume.The experiment characterized the risers’roughness by arranging different specifications of attachments on the surface of the risers.Three rough risers with different roughness and smooth risers were arranged in tandem arrangement,with the rough risers arranged downstream.The experimental results indicate that the suppression of the attachments on the downstream risers’vibration are more significant both in the CF and IL directions as the reduced velocity increases.For the downstream riser,the amplitude response of rough riser is more significantly weakened compared with the smooth one at high reduced velocity.For the upstream risers,changes in the roughness and spacing ratio have an impact on their‘lock-in’region.When the roughness of downstream risers is relatively large(0.1300)and the spacing between risers is small(S/D=4.0),the reduced velocity range of‘lock-in’region in the CF direction of upstream risers is obviously expanded,and the displacement in the‘lock-in’region is severer. 展开更多
关键词 marine riser vortex-induced vibration tandem arrangement ROUGHNESS interference effect
下载PDF
Interaction Mechanisms between Natural Debris Flow and Rigid Barrier Deflectors:A New Perspective for Rational Design and Optimal Arrangement
15
作者 Yu Huang Beilei Liu +1 位作者 Dianlei Feng Hao Shi 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第5期1679-1699,共21页
Rigid barrier deflectors can effectively prevent overspilling landslides,and can satisfy disaster prevention requirements.However,the mechanisms of interaction between natural granular flow and rigid barrier deflector... Rigid barrier deflectors can effectively prevent overspilling landslides,and can satisfy disaster prevention requirements.However,the mechanisms of interaction between natural granular flow and rigid barrier deflectors require further investigation.To date,few studies have investigated the impact of deflectors on controlling viscous debris flows for geological disaster prevention.To investigate the effect of rigid barrier deflectors on impact mechanisms,a numerical model using the smoothed particle hydrodynamics(SPH)method with the Herschel–Bulkley model is proposed to simulate the interaction between natural viscous flow and single/dual barriers with and without deflectors.This model was validated using laboratory flume test data from the literature.Then,the model was used to investigate the influence of the deflector angle and multi-barrier arrangements.The optimal configuration of multi-barriers was analyzed with consideration to the barrier height and distance between the barriers,because these metrics have a significant impact on the viscous flow pile-up,run-up,and overflow mechanisms.The investigation considered the energy dissipation process,retention efficiency,and dead-zone formation.Compared with bare barriers with similar geometric characteristics and spatial distribution,rigid barriers with deflectors exhibit superior effectiveness in preventing the overflow and overspilling of viscous debris flow.Recommendations for the rational design of deflectors and the optimal arrangement of multi-barriers are provided to mitigate geological disasters. 展开更多
关键词 Rigid barrier deflectors deflector angle single-barrier dual-barrier arrangements viscous debris flow over-spilling delta-plus-SPH
下载PDF
全国标准化工作会议在京召开
16
作者 靳吉丽 《China Standardization》 2024年第2期26-27,共2页
The National Standardization Work Conference was held in Beijing on January 11 to summarize the standardization work in 2023 and arrange the key standardization tasks in 2024. Luo Wen, Minister of SAMR, Wang Jingtao, ... The National Standardization Work Conference was held in Beijing on January 11 to summarize the standardization work in 2023 and arrange the key standardization tasks in 2024. Luo Wen, Minister of SAMR, Wang Jingtao, Vice Administrator of the Office of the Central Cyberspace Affairs Commission. 展开更多
关键词 MINISTER STANDARDIZATION ARRANGE
下载PDF
世界政治变革向纵深演进
17
作者 CICIR Task Force Li Yan 《Contemporary International Relations》 2024年第1期4-9,共6页
The year 2023 marked an important year of change, in which multiple old orders have given way to new arrangements. “The end of the post-Cold War era,” “the beginning of the post-pandemic era,” “the ebb of the era... The year 2023 marked an important year of change, in which multiple old orders have given way to new arrangements. “The end of the post-Cold War era,” “the beginning of the post-pandemic era,” “the ebb of the era of economic globalization,” “the return of the era of geopolitical conflict.” 展开更多
关键词 政治变革 RETURN arrangement
下载PDF
Evaluation of the Living Conditions and Health Perceptions of Waste Electrical and Electronic Equipment Handlers in the Informal Sector in Dakar
18
作者 Robert Faomowe Foko Awa Ndong +6 位作者 Marius Kedote Fatoumata Bah Absa Lam Cheikh Diop Aminata Toure Mathilde Cabral Mamadou Fall 《Occupational Diseases and Environmental Medicine》 2024年第2期115-129,共15页
Electrical and electronic devices are becoming an increasingly important part of our society. In Africa, and in Senegal in particular, the handling and management of electronic and electrical equipment (EEE) that has ... Electrical and electronic devices are becoming an increasingly important part of our society. In Africa, and in Senegal in particular, the handling and management of electronic and electrical equipment (EEE) that has reached the end of its life is mainly informal. This professional environment is characterized by the disintegration of the sector and the social heterogeneity that can be found there. The objective of this study is to assess the standard of living of electrical and electronic equipment waste handlers in the Dakar region, as well as their perception of their health. A survey was used to obtain information on sociodemographic background, living arrangements, perception of health status, and good practices to be implemented in case of work-related health problems. Life style, perception of general health and health problems were ranged as excellent, very good, good, average and poor. Informal recyclers in the Dakar region lived mainly in rooms and buildings as tenants (49.1%), or in family homes (48.4%) before starting this activity, and 51.2% continue to live in rooms and buildings as tenants compared to 41.4% who still live in a family home. The perception of health status ranged from poor to excellent, and 4.9% believe that they are limited in work due to a disability or health problem. Informal work is a heterogeneous phenomenon that makes research and policymaking particularly complex. There are several external factors within informal WEEE re-cyclers that can cause health problems or functional disability. However, the living conditions and the perception they have of their state of health are contradictory to the working conditions and the social environment to which they belong. A biomedical approach would consolidate these achievements by confirming or invalidating them. 展开更多
关键词 E-WASTE Informal Work Living Arrangements Health Perception Occupational Exposure
下载PDF
Smart Parking Management System “MOTAH”
19
作者 Iman Alansari Ghadah Alnamlah +2 位作者 Razan Abduallah Jumana Alluqmani Alaa Alzahrani 《Journal of Software Engineering and Applications》 2024年第6期541-552,共12页
With a surge in the university’s student and staff population, parking problems and congestion have rapidly intensified. The recent inclusion of women drivers, particularly during official working hours, has exacerba... With a surge in the university’s student and staff population, parking problems and congestion have rapidly intensified. The recent inclusion of women drivers, particularly during official working hours, has exacerbated these challenges. This pressing issue underscores the critical necessity for a structured approach to managing university entries and overseeing parking at the gates. The proposed smart parking management system aims to address these concerns by introducing a design concept that restricts unauthorized access and provides exclusive parking privileges to authorized users. Through image processing, the system identifies available parking spaces, relaying real-time information to users via a mobile application. This comprehensive solution also generates detailed reports (daily, weekly, and monthly), aiding university safety authorities in future gate management decisions. 展开更多
关键词 Car Parking Traffic Density Estimation Intelligent Transportation CONGESTION CONTROL Parking Arrangement Parking Behavior
下载PDF
Easy Paying Optimizing payment options for international visitors to China
20
作者 Zhang Lijuan 《China Report ASEAN》 2024年第4期28-29,共2页
As of January 31,2024,China had concluded mutual visa exemption agreements covering different types of passports with 157 countries,reached agreements or arrangements on simplified visa procedures with 44 countries,an... As of January 31,2024,China had concluded mutual visa exemption agreements covering different types of passports with 157 countries,reached agreements or arrangements on simplified visa procedures with 44 countries,and enjoyed comprehensive mutual visa exemptions with 23 countries including Thailand,Singapore,Maldives,and the United Arab Emirates. 展开更多
关键词 mutual PAY arrangement
下载PDF
上一页 1 2 25 下一页 到第
使用帮助 返回顶部