期刊文献+
共找到3,286篇文章
< 1 2 165 >
每页显示 20 50 100
Understanding the combustion behavior of electric bicycle batteries and unveiling its relationship with fire extinguishing
1
作者 Zhanglong Yu Xueling Shen +6 位作者 Ran Xu Zheng Wang Zengming Wan Mingyang Chen Yi Cui Yanyan Fang Xiaoli Ma 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第4期609-618,共10页
In this study,a detailed analysis of the combustion behaviors of the lithium iron phosphate(LFP)and lithium manganese oxide(LMO)batteries used in electric bicycles was conducted.This research included quantitative mea... In this study,a detailed analysis of the combustion behaviors of the lithium iron phosphate(LFP)and lithium manganese oxide(LMO)batteries used in electric bicycles was conducted.This research included quantitative measurements of the combustion duration,flame height,combustion temperature,heat release rate,and total heat release.The results indicated that LMO batteries exhibited higher combustion temperatures of 600–700°C,flame heights of 70–75 cm,a significantly higher heat release rate of40.1 k W(12 Ah),and a total heat release of 1.04 MJ(12 Ah)compared to LFP batteries with the same capacity.Based on these experimental results,a normalized total heat release(NORTHR)parameter was proposed,demonstrating good universality for batteries with different capacities.Utilizing this parameter,quantitative calculations and optimization of the extinguishing agent dosage were conducted for fires involving these two types of batteries,and the method was validated by extinguishing fires for these two types of battery packs with water-based extinguishing fluids. 展开更多
关键词 Combustion behavior Electric bicycle Lithium-ion battery Fire extinguishing Normalized total heat release
下载PDF
Research on Planning and Design of Multi-Story Prefabricated Electric Bicycle Charging Parking Lot in Urban and Rural Areas
2
作者 Liya Fang 《Journal of Architectural Research and Development》 2024年第4期77-91,共15页
In recent years,disorderly parking and difficult charging of electric bicycles have been challenges in urban management.The rapid growth of electric bicycles is in contradiction with the lack of dedicated parking spac... In recent years,disorderly parking and difficult charging of electric bicycles have been challenges in urban management.The rapid growth of electric bicycles is in contradiction with the lack of dedicated parking spaces and charging service facilities in towns and villages.To solve the issue of parking and charging electric bicycles in limited urban and rural spaces,prefabricated building technology is applied to the design of a multi-story electric bicycle parking lot.The multi-story prefabricated electric bicycle parking lot is utilized in urban and rural planning and design to upgrade parking facilities in old urban areas,land-constrained commercial areas,as well as counties,towns,and rural areas with inadequate municipal facilities.Multi-story prefabricated electric bicycle parking lots are the application exploration of industrial buildings,and promote the high-quality development planning and construction of towns and counties and villages.Compared with the single-story metal charging station,the multi-story assembled electric bicycle parking lot has the characteristics of integrating parking and charging,being more durable and safer in structure,accommodating a large number of vehicles,and improving the space utilization rate. 展开更多
关键词 Prefabricated building Electric bicycle Parking lot
下载PDF
走近微媒体体验营销——基于滴滴打车和ofo bicycle的案例研究 被引量:4
3
作者 王倩 《企业研究》 2016年第7期40-43,共4页
随着移动APP的普及和电子商务的快速发展,移动支付市场的发展受到商家和消费者越来越多的关注和青睐。作为目前最前卫的支付工具,微信支付在体验式营销上有着得天独厚的优势。微信支付的同时,不仅给消费者带来了愉悦、便捷的消费体验,... 随着移动APP的普及和电子商务的快速发展,移动支付市场的发展受到商家和消费者越来越多的关注和青睐。作为目前最前卫的支付工具,微信支付在体验式营销上有着得天独厚的优势。微信支付的同时,不仅给消费者带来了愉悦、便捷的消费体验,同时也提升了企业的形象和实力。本文以"滴滴打车"和"ofo bicycle"为研究对象,运用规范的案例研究方法,以施密特体验营销的五要素模块为理论基础,分析微信的体验式营销是如何达到用户满意,实现成功营销的,并尝试构建微媒体体验营销下用户体验过程模型,为网络体验营销的发展和运用提供借鉴和参考。 展开更多
关键词 微媒体 ofo bicycle 体验式营销 运用规范 案例研究方法 移动支付 用户体验 支付工具 成功营销 网络体验
下载PDF
Optimal Design of Bicycle Frame Parameters Considering Biomechanics 被引量:3
4
作者 XIANG Zhongxia XU Ruifen +1 位作者 BU Yan WU Xiaofan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2011年第1期141-145,共5页
With the development of technology and the change of market demands,the trend in middle and high grade bicycle manufacturing is developed toward small-volume,multi-species,and customer-oriented production.Therefore,hu... With the development of technology and the change of market demands,the trend in middle and high grade bicycle manufacturing is developed toward small-volume,multi-species,and customer-oriented production.Therefore,human element should be fully considered in design so that the bicycle has the best cycling performance for the specific rider.Currently,customized design is difficult to achieve since feature parameters of the rider are not included in the design.The design of bicycle frame is the most important in bicycle design.The relative positions among the saddle,handlebar and central axis are defined as the bicycle three-pivot,they are the main parameters in bicycle frame design.In conventional bicycle design,frame parameters are merely relevant to bicycle types.On the basis of the principles of biomechanics and ergonomics knowledge,this paper presents a design method for bicycle three-pivot considering feature parameters of the rider by dynamic simulation.Firstly,a dynamic model of rider-bicycle system is built for a special rider,and a serial of simulation experiments is designed by uniform test method.Then,a mathematical model is built between the three-pivot position and the square of lower limb muscle stress by using simulation and regression analysis of the rider-bicycle system.The optimal three-pivot position parameters are obtained by setting the minimal of the square of the lower limb muscle stress as the objective.Therefore,the optimal parameters are gained for the specific rider.Finally,various results are gained for different riders based on the same design process.The function between feature parameters of the rider and the optimum three-pivot position parameters is built by regression.Bicycle design considering biomechanics can be divided into three main steps:calculating the three-pivot position,designing the geometrical structure of the bicycle frame and analyzing frame strength,and selecting appropriate parts and assembling the bicycle.Bicycle design considering biomechanics changes the conventional bicycle design and realizes customized design by considering human element in the design process. 展开更多
关键词 bicycle design BIOMECHANICS muscle fatigue feature parameters of the rider
下载PDF
Reconstruction of Car-Electric Bicycle Side Collision Based on PC-Crash 被引量:3
5
作者 Shenchao Wang Yubin Qian Xianguo Qu 《Journal of Transportation Technologies》 2014年第4期355-364,共10页
A collision model, an automobile model and a multi-rigid-body model in PC-crash are analyzed. By simulating a side collision accident between a car and an electric bicycle (EB), a method that reproduces the car-electr... A collision model, an automobile model and a multi-rigid-body model in PC-crash are analyzed. By simulating a side collision accident between a car and an electric bicycle (EB), a method that reproduces the car-electric bicycle side collision accident based on PC-crash is presented according to some important information such as the final position, the contacting location between the cyclist and the car. A result is obtained by comparing with the reproduced result, the deformation of accident vehicle and the surveillance video. The rollover direction and fells-over sliding direction after the collision and the contacting location and wrap motion of cyclist and electric bicycle are fitting in with the real situation better compared with the reconstruction result in PC-crash. Then the responsive-surface method and MONTEKARLO method are used in MATLAB to analyze the uncertainty of the vehicle speed in reproduced scene results. And the range of values of the pre-collision speed is obtained which makes the reproduced result more objective and convincible that could provide the basis of the accident assessment. 展开更多
关键词 PC-CRASH ACCIDENT Reproduced Electric bicycles Responsive-Surface the Analysis of the Uncertainty
下载PDF
Travel Behaviours of Sharing Bicycles in the Central Urban Area Based on Geographically Weighted Regression: The Case of Guangzhou, China 被引量:7
6
作者 WEI Zongcai ZHEN Feng +3 位作者 MO Haitong WEI Shuqing PENG Danli ZHANG Yuling 《Chinese Geographical Science》 SCIE CSCD 2021年第1期54-69,共16页
Mobile information and communication technologies(MICTs) have fully penetrated everyday life in smart societies;this has greatly compressed time, space, and distance, and consequently, reshaped residents’ travel beha... Mobile information and communication technologies(MICTs) have fully penetrated everyday life in smart societies;this has greatly compressed time, space, and distance, and consequently, reshaped residents’ travel behaviour patterns. As a new mode of shared mobility, the sharing bicycle offers a variety of options for the daily travel of urban residents. Extant studies have mainly examined the travel characteristics and influencing factors of public bicycles with piles, while the travel patterns for sharing bicycles and their driving mechanisms have been largely ignored. Using one week’s travel data for Mobike, this study investigated the spatial and temporal distribution patterns of sharing bicycle travel behaviours in the central urban area of Guangzhou, China;furthermore, it identified the influences of built environment density factors on sharing bicycle travel behaviours based on the geographically weighted regression method. Obvious morning and evening peaks were observed in the sharing bicycle travel patterns for both weekdays and weekends. The old urban area, which had a high degree of mixed function, dense road networks, and cycling-friendly built environments, was the main travel area that attracted sharing bicycles on both weekdays and weekends. Furthermore, factors including the point of interest(POI) for the density of public transport stations, the functional mixing degree, and the density of residential POIs significantly affected residents’ travel behaviours. These findings could enrich discourse regarding shared mobility with a Chinese case characterised by rapidly developing MICTs and also provide references to local authorities for improving slow traffic environments. 展开更多
关键词 sharing bicycles travel behaviours smart societies geographically weighted regression analysis Guangzhou China
下载PDF
Clustering the Stations of Bicycle Sharing System 被引量:1
7
作者 史晓颖 俞振海 +1 位作者 徐海涛 黄彬彬 《Journal of Donghua University(English Edition)》 EI CAS 2016年第6期968-972,共5页
Bicycle sharing system has emerged as a new mode of transportation in many big cities over the past decade.Since the large number of bicycle stations distribute widely in the city,it is difficult to identify their uni... Bicycle sharing system has emerged as a new mode of transportation in many big cities over the past decade.Since the large number of bicycle stations distribute widely in the city,it is difficult to identify their unique attributes and characteristics directly.Oriented to the real bicycle hire dataset in Hangzhou,China,the clustering analysis for the bicycle stations based on the temporal flow data was carried out firstly.Then,based on the spatial distribution and temporal attributes of calculated clusters,visual diagram and map were used to vividly analyze the bicycle hire behavior related to station category and study the travel rules of citizens.The experimental results demonstrate the relation between human mobility,the time of day,day of week and the station location. 展开更多
关键词 urban mining human mobility analysis visual analytics bicycle sharing system
下载PDF
Campus Mobility for the Future: The Electric Bicycle 被引量:1
8
作者 I. V. McLoughlin I. K. Narendra +4 位作者 L. H. Koh Q. H. Nguyen B. Seshadri W. Zeng C. Yao 《Journal of Transportation Technologies》 2012年第1期1-12,共12页
Sustainable and practical personal mobility solutions for campus environments have traditionally revolved around the use of bicycles, or provision of pedestrian facilities. However many campus environments also experi... Sustainable and practical personal mobility solutions for campus environments have traditionally revolved around the use of bicycles, or provision of pedestrian facilities. However many campus environments also experience traffic congestion, parking difficulties and pollution from fossil-fuelled vehicles. It appears that pedal power alone has not been sufficient to supplant the use of petrol and diesel vehicles to date, and therefore it is opportune to investigate both the reasons behind the continual use of environmentally unfriendly transport, and consider potential solutions. This paper presents the results from a year-long study into electric bicycle effectiveness for a large tropical campus, identifying barriers to bicycle use that can be overcome through the availability of public use electric bicycles. 展开更多
关键词 Electric bicycle E-Bike CAMPUS TRANSPORT PERSONAL MOBILITY
下载PDF
Non-smooth dynamic modeling and simulation of an unmannedbicycle on a curved pavement 被引量:1
9
作者 Kaiming ZHANG Xudong ZHENG +3 位作者 Zhang CHEN Bin LIANG Tianshu WANG Qi WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2022年第1期93-112,共20页
The non-smooth dynamic model of an unmanned bicycle is established to study the contact-separate and stick-slip non-smooth phenomena between wheels and the ground.According to the Carvallo-Whipple configuration,the un... The non-smooth dynamic model of an unmanned bicycle is established to study the contact-separate and stick-slip non-smooth phenomena between wheels and the ground.According to the Carvallo-Whipple configuration,the unmanned bicycle is reduced to four rigid bodies,namely,rear wheel,rear frame,front fork,and front wheel,which are connected by perfect revolute joints.The interaction between each wheel and the ground is simplified as the normal contact force and the friction force at the contact point,and these forces are described by the Hunt-Crossley contact force model and the Lu Gre friction force model,respectively.According to the characteristics of flat and curved pavements,calculation methods for contact forces and their generalized forces are presented.The dynamics of the system is modeled by the Lagrange equations of the first kind,a numerical solution algorithm of the dynamic equations is presented,and the Baumgarte stabilization method is used to restrict the drift of the constraints.The correctness of the dynamic model and the numerical algorithm is verified in comparison with the previous studies.The feasibility of the proposed model is demonstrated by simulations under different motion states. 展开更多
关键词 unmanned bicycle non-smooth dynamics Lu Gre model contact-impact STICK-SLIP
下载PDF
Development of a Bikeability Index to Assess the Bicycle-Friendliness of Urban Environments 被引量:1
10
作者 Patricia Jasmin Krenn Pekka Oja Sylvia Titze 《Open Journal of Civil Engineering》 2015年第4期451-459,共9页
Background: Cycling as a means of transport contributes to public health in terms of increasing the physical activity behaviour and reducing air pollution. In comparison to walking, cycling-spe cific environmental cha... Background: Cycling as a means of transport contributes to public health in terms of increasing the physical activity behaviour and reducing air pollution. In comparison to walking, cycling-spe cific environmental characteristics have been less investigated. The aim of this study was to develop, based on geographic information systems (GIS) data, a bikeability index for a mid-sized European city, to examine the predictive validity of the index and to visualize the bicycle-friendliness of the city by creating a bikeability map. Methods: Using GIS data, we assessed the environmental characteristics of 278 bicycle trips in the city of Graz, Austria. Characteristics which differed significantly between the actually taken and shortest possible routes were used to form an additive bikeability index and the bikeability map for 100 m × 100 m cells. The relationship between the cycling behaviour and the bikeability index around the home environment was examined to assess the predictive validity of the index. Results: Three environmental components (cycling infrastructure, bicycle pathways and green areas) were positively related, and two components (main roads, and topography) were negatively related to the actually used route. These components formed the bikeability index, which was positively correlated with cycling behaviour (OR: 1.08, 95% CI 1.01 - 1.17). The final outcome is a high-resolution coloured map indicating the degree of bicycle-friendliness in the city of Graz. Conclusion: Mapping based on the bikeability index helps to visualize the bicycle-friendliness of an urban area. Therefore, it should be a useful tool for the planning as well as for the evaluation of the transport environments in cities. 展开更多
关键词 bicycling Environment MAP GIS ACTIVE MOBILITY
下载PDF
Allocation optimization of bicycle-sharing stations at scenic spots 被引量:5
11
作者 郭唐仪 张平 +1 位作者 邵飞 刘英舜 《Journal of Central South University》 SCIE EI CAS 2014年第8期3396-3403,共8页
Bicycle-sharing system is considered as a green option to provide a better connection between scenic spots and nearby metro/bus stations.Allocating and optimizing the layout of bicycle-sharing system inside the scenic... Bicycle-sharing system is considered as a green option to provide a better connection between scenic spots and nearby metro/bus stations.Allocating and optimizing the layout of bicycle-sharing system inside the scenic spot and around its influencing area are focused on.It is found that the terrain,land use,nearby transport network and scenery point distribution have significant impact on the allocation of bicycle-sharing system.While the candidate bicycle-sharing stations installed at the inner scenic points,entrances/exits and metro stations are fixed,the ones installed at bus-stations and other passenger concentration buildings are adjustable.Aiming at minimizing the total cycling distance and overlapping rate,an optimization model is proposed and solved based on the idea of cluster concept and greedy heuristic.A revealed preference/stated preference(RP/SP) combined survey was conducted at Xuanwu Lake in Nanjing,China,to get an insight into the touring trip characteristics and bicycle-sharing tendency.The results reveal that 39.81% visitors accept a cycling distance of 1-3 km and 62.50% respondents think that the bicycle-sharing system should charge an appropriate fee.The survey indicates that there is high possibility to carry out a bicycle-sharing system at Xuanwu Lake.Optimizing the allocation problem cluster by cluster rather than using an exhaustive search method significantly reduces the computing amount from O(243) to O(432).The 500 m-radius-coverage rate for the alternative optimized by 500 m-radius-cluster and 800 m-radius-cluster is 89.2% and 68.5%,respectively.The final layout scheme will provide decision makers engineering guidelines and theoretical support. 展开更多
关键词 共享系统 优化配置 自行车 景区 分配问题 土地利用 交通网络 优化模型
下载PDF
Video Recognition for Analyzing the Characteristics of Vehicle–Bicycle Conflict 被引量:1
12
作者 Xingjian Xue Zixu Wang +3 位作者 Linjuan Ge Lirong Deng Rui Song Neal Naixue Xiong 《Computers, Materials & Continua》 SCIE EI 2021年第11期2779-2791,共13页
Vehicle–bicycle conflict incurs a higher risk of traffic accidents,particularly as it frequently takes place at intersections.Mastering the traffic characteristics of vehicle–bicycle conflict and optimizing the desi... Vehicle–bicycle conflict incurs a higher risk of traffic accidents,particularly as it frequently takes place at intersections.Mastering the traffic characteristics of vehicle–bicycle conflict and optimizing the design of intersections can effectively reduce such conflict.In this paper,the conflict between right-turning motor vehicles and straight-riding bicycles was taken as the research object,and T-Analyst video recognition technology was used to obtain data on riding(driving)behavior and vehicle–bicycle conflict at seven intersections in Changsha,China.Herein,eight typical traffic characteristics of vehicle–bicycle conflict are summarized,the causes of vehicle–bicycle conflict are analyzed using 18 factors in three dimensions,the internal relationship between intersection design factors and traffic conflicts is explored,and the guiding of design optimization based on the width of bicycle lanes and the soft separation between vehicles and bicycles is discussed.The results showed that colored paved bicycle lanes were better,performing better at a width of 2.5 m compared to 1.5 m.However,the colored pavement was not suitable for the entire road and had to be set at the position,at which the trajectories of a bicycle and motor vehicle overlapped.Thus,a 2.5-m-wide bicycle lane provides good safety.However,there are still defects in the existing safety indicators,so it is necessary to develop new indicators to reflect real vehicle–bicycle conflict situations more comprehensively. 展开更多
关键词 Vehicle-bicycle conflict video recognition technology bicycle lane width vehicle-bicycle separation method
下载PDF
Load on Bicycle Frame During Cycling with Different Speeds and Gestures 被引量:2
13
作者 项忠霞 田冠 +2 位作者 许文 关新 于晓然 《Transactions of Tianjin University》 EI CAS 2011年第4期270-274,共5页
Experiment and dynamic simulation were combined to obtain the loads on bicycle frame. A dynamic model of body-bicycle system was built in ADAMS. Then the body gestures under different riding conditions were captured b... Experiment and dynamic simulation were combined to obtain the loads on bicycle frame. A dynamic model of body-bicycle system was built in ADAMS. Then the body gestures under different riding conditions were captured by a motion analysis system. Dynamic simulation was carried out after the data of body motions were input into the simulation system in ADAMS and a series of loads that the body applied on head tube, seat pillar and bottom bracket were obtained. The results show that the loads on frame and their distribution are apparently different under various riding conditions. Finally, finite element analysis was done in ANSYS, which showed that the stress and its distribution on frame were apparently different when the frame was loaded according to the bicycle testing standard and simulation respectively. An efficient way to obtain load on bicycle frame accurately was proposed, which is significant for the safety of cycling and will also be the basis for the bicycle design of digitalization, lightening and customization. 展开更多
关键词 自行车 负载 车架 姿势 ADAMS 速度 动态模拟 仿真系统
下载PDF
Analysis and Comparison of Safety and Fatigue Comfort of Postal Bicycles Based on Finite Element Method and sEMG 被引量:5
14
作者 项忠霞 李亚南 +1 位作者 田冠 常振元 《Transactions of Tianjin University》 EI CAS 2013年第4期272-278,共7页
The safety and the fatigue comfort were compared between a domestic and a Japanese postal bicycle. Firstly, the fatigue comfort of these two kinds of bicycles was evaluated by surface electromyographic signal (sEMG) e... The safety and the fatigue comfort were compared between a domestic and a Japanese postal bicycle. Firstly, the fatigue comfort of these two kinds of bicycles was evaluated by surface electromyographic signal (sEMG) experiment, in which human lower limb muscle groups were research objects, and the average EMG (AEMG) index and median frequency (MF) were chosen as the evaluation indexes. Secondly, the safety of these two kinds of bicycle frames was analyzed and compared by using the finite element analysis. The results show that the riding fatigue comfort of the Japanese postal bicycle is better, and the Japanese postal bicycle frame is more safe and reasonable although both the postal bicycles meet the requirement for strength. Finally, based on the above analysis, the frame structure and related parameters of the domestic postal bicycle were improved with reference to the Japanese postal bicycle and biomechanics theory. 展开更多
关键词 表面肌电图 自行车 安全性 舒适度 邮政 疲劳 有限元法 评价指标
下载PDF
Correlation between the results of three physical fitness tests(endurance,strength,speed) and the output measured during a bicycle ergometer test in a cohort of military servicemen
15
作者 Stefan Sammito Nils Gundlach Irina B?ckelmann 《Journal of Medical Colleges of PLA(China)》 CAS 2016年第3期134-139,共6页
Background: Physical fitness tests are widely used to assess endurance,sprint ability,coordination and/or strength.The objective of the present study was to analyze the degree to which the results of the Bundeswehr Ba... Background: Physical fitness tests are widely used to assess endurance,sprint ability,coordination and/or strength.The objective of the present study was to analyze the degree to which the results of the Bundeswehr Basis Fitness Test(BFT)–a physical fitness test comprising a sprint test(11×10-m shuttle test),a flexed-arm hang test and a 1000-m run–are consistent with the output measured during a bicycle ergometer test.The number of false-positive and falsenegative results with regard to the assessment of physical fitness were also examined.Methods: As part of a retrospective study,health assessments from 323 reenlistment examinations were evaluated regarding the output measured during a bicycle ergometer test and compared with the BFT results of the candidates.Results: Overall,a good correlation was shown between the bicycle ergometer test results and the results achieved in the BFT disciplines.All three disciplines of the BFT showed a highly significant correlation with the relative output achieved during the bicycle ergometer test(P<0.001),and also,the overall BFT score was highly significantly correlated(P<0.001).The overall rate of false-positive and false-negative results was 4.0%.Conclusion: The BFT results measured in the three physical fitness test items were highly correlated with the output measured during the bicycle ergometer tests.The rate of false-positive and false-negative results was low.The test items thus represent an appropriate measurement instrument because the test items require few equipment and less time.Additionally,a large number of subjects can be assessed.We suggest that it would be more useful to assess the physical fitness of this special group exclusively on the basis of the BFT instead of using the bicycle ergometer test. 展开更多
关键词 Physical fitness Military Ergometer test bicycle TREADMILL
下载PDF
Bicycle capacity of borrowed-priority merge at unsignalized intersections in China
16
作者 杨小宝 环梅 +1 位作者 四兵锋 高亮 《Journal of Beijing Institute of Technology》 EI CAS 2012年第2期229-233,共5页
To investigate bicyclists' behavior at unsignalized intersections with mixed traffic flow, a bicycle capacity model of borrowed-priority merge was developed by the addition-conflict-flow procedure. Based on the actua... To investigate bicyclists' behavior at unsignalized intersections with mixed traffic flow, a bicycle capacity model of borrowed-priority merge was developed by the addition-conflict-flow procedure. Based on the actual traffic situation, the concept of borrowed priority, in which the majorroad bicycles borrow the priority of major-road cars to enter the intersections when consecutive headway for major-steam cars is lower than the critical gap for minor-road cars, was addressed. Bicycle capacity at a typical unsignalized intersection is derived by the addition-conflict-flow procedure. The proposes model was validated by the empirical investigation. Numerical results show that bicycle capacity at an intersection is the function of major-road and minor-road car streams. Bicycle capacity increases with increasing major-road cars but decreases with increasing minorroad cars. 展开更多
关键词 mixed traffic flow unsignalized intersection bicycle capacity PRIORITY
下载PDF
Switching to alternative transit:combining bicycle safety improvements with parking regulations
17
作者 Isabel Qi 《Chinese Journal of Population,Resources and Environment》 2016年第2期81-87,共7页
Smart growth policies advocate for economically viable,environmentally conscientious,and socially equitable solutions for urban development.These policies were developed largely in response to issues rooted in the aut... Smart growth policies advocate for economically viable,environmentally conscientious,and socially equitable solutions for urban development.These policies were developed largely in response to issues rooted in the automobile-oriented culture:air pollution,high greenhouse gas emissions,traffic congestion,and sedentary lifestyles.In urban settings,a good transportation alternative is cycling,since it is able to serve the travel needs of nearly half of city dwellers' daily trips.Many European and Canadian cities have successfully increased cycling rates by creating safer bicycle environments and restricting or discouraging automobile use.To evaluate the potential effects of the above measures on American urban areas,this paper examines case studies of cycle tracks and bicycle boulevards implemented in American cities,and how these facility improvements have changed how safe cyclists feel on the road and overall bicycle usage.Results show the two methods are indeed effective in increasing bicycle usage rates.Ultimately,increasing cycling rates needs policies to discourage people from driving,the greatest mode share in nearly all urban areas.Parking policy has major impacts on people's decision to use the automobile.Currently,parking is oversupplied and underpriced in many cities,making it irresistible for people to drive.Decreasing the number of parking spaces available and increasing their price will increase pressure on drivers to drive less,especially for short trips,and to bike instead.It is important for planners and policy makers to realize that solutions from both directions,making biking more enjoyable and making parking,and hence driving,less affordable,should be used in tandem.The complementary nature of the two approaches makes it so the effect of the combination is greater than the sum of the two. 展开更多
关键词 TRANSPORTATION transportation policy alternative transit bicycle safety parking regulations
下载PDF
How do Users Evaluate Service Quality of the Dockless Bicycle Sharing System?
18
作者 Jianrong Liu 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2020年第1期19-35,共17页
In order to improve the public transit’s accessibility and promote service quality of the public transit,it is necessary to alleviate the“last⁃mile”problem.The combination of the public transit and bicycle⁃sharing ... In order to improve the public transit’s accessibility and promote service quality of the public transit,it is necessary to alleviate the“last⁃mile”problem.The combination of the public transit and bicycle⁃sharing system is competitive compared with the private car.In 2016,the dockless bicycle⁃sharing system has been undergoing tremendous development.Because the dockless bicycle⁃sharing system is different from previous bicycle⁃sharing systems,components of service quality of the dockless bicycle⁃sharing system differ.However,there are few articles about the service quality of the dockless bicycle⁃sharing system.This paper examined the evaluation of service quality of the dockless bicycle⁃sharing system along with a measurement of users’satisfaction.A questionnaire about service quality was designed,which includes 15 factors.Through the analysis of travelers’evaluation of factors of the dockless bicycle⁃sharing system with Rasch Model,these original ordinal data(Likert data)was transformed to the interval data:the person parameter(ability)and the item parameter(difficulty).Through the analysis of interviewees’abilities,it was found that only education and monthly consumption have significant influence on interviewees’evaluation of service quality of the dockless bicycle⁃sharing system,while there is no significant influence of gender,weekly use of dockless shared⁃bicycle,private car ownership,or monthly income on the evaluation.Furthermore,it was found that users were dissatisfied with cycling under the adverse weather,disturbance from pedestrians and cars,continuity of the bicycle lane,complaint channel,and staff service the most. 展开更多
关键词 dockless bicycle sharing system service quality Rasch Model demographic characteristic evaluation of travelers
下载PDF
Optimal Design of Mountain Bicycle Based on Biomechanics 被引量:1
19
作者 卜研 黄田 +2 位作者 项忠霞 吴小凡 陈春 《Transactions of Tianjin University》 EI CAS 2010年第1期45-49,共5页
To achieve better cycling performance and vibration comfort of mountain bicycle, the optimization of frame structural parameters and rear suspension scale parameters is investigated based on biomechanics.Firstly, the ... To achieve better cycling performance and vibration comfort of mountain bicycle, the optimization of frame structural parameters and rear suspension scale parameters is investigated based on biomechanics.Firstly, the quadratic sum of rider lower limb muscles stresses is presented as the evaluation criterion of muscle fatigue.By taking the criterion as the objective function, the relative positions of three pivot points of frame are optimized to ensure that the frame structural parameters match the stature of riders.Secondly, the vibration performance is evaluated referring to the ISO 2631-1 Mechanical Vibration and Shock Evaluation of Human Exposure to Whole-Body Vibration.According to this evaluation, the mapping relationship between the vibration performance and rider's weight as well as structural parameters of rear suspension is revealed.Results show that the length of side link has no significant effect on vibration comfort, while rider's weight is important in the design of mountain bicycle. 展开更多
关键词 山自行车 BIOMECHANICS 肌肉疲劳 颤动舒适 最佳设计
下载PDF
Using of spectral analysis of heart rate variability for increasing reliability of bicycle ergometry results
20
作者 Vladimir Ivanovich Gridnev Anton Robertovich Kiselev +1 位作者 Olga Mikhailovna Posnenkova Vladimir Alexandrovich Shvartz 《Health》 2011年第8期477-481,共5页
The aim was to study the suitability of the heart rate variability (HRV) spectral parameters for evaluations of bicycle ergometry results in coronary heart disease (CHD) patients. Methods. Our study included 243 male ... The aim was to study the suitability of the heart rate variability (HRV) spectral parameters for evaluations of bicycle ergometry results in coronary heart disease (CHD) patients. Methods. Our study included 243 male CHD patients aged 49±8 years. The coronary atherosclerosis was assessed by coronary angiography. The results of bicycle ergometry, Doppler echocardio-graphy and HRV spectral analysis were also analyzed. The duration of each stage of bicycle ergometry was 3 min, the initial load value was 25 W. Dynamic load continued until the patient had reached 75% of heart rate from his maximal age level. The maximal level of load achieved (i.e. load tolerance) was taken into consideration. We calculated sensitivity (Se), specificity (Sp), likelihood ratios of positive (LR+) and negative (LR-) bicycle ergometry results. Results. All patients had similar clinical characteristics. LR+ become maximal under the moderate load tolerance. LR- are maximal in the CHD patients with high load tolerance. Thus, the excessiveness of false-negative results of bicycle ergometry is in CHD patients with high load tolerance. Reliability of results of bicycle ergometry increased under using assessments of low-frequency (LF) range power of HRV spectrum. Conclusions. Thus,the using of LF range power of HRV spectrum increases reliability of bicycle ergometry (or other load tests) results in CHD patients. 展开更多
关键词 HEART Rate VARIABILITY bicycle ERGOMETRY CORONARY HEART Disease
下载PDF
上一页 1 2 165 下一页 到第
使用帮助 返回顶部