oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 11 )

2018 ( 76 )

2017 ( 58 )

2016 ( 116 )

自定义范围…

匹配条件: “ E-Bike” ,找到相关结果约15031条。
列表显示的所有文章,均可免费获取
第1页/共15031条
每页显示
Campus Mobility for the Future: The Electric Bicycle  [PDF]
I. V. McLoughlin, I. K. Narendra, L. H. Koh, Q. H. Nguyen, B. Seshadri, W. Zeng, C. Yao
Journal of Transportation Technologies (JTTs) , 2012, DOI: 10.4236/jtts.2012.21001
Abstract: 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.
中国电动自行车废旧电池的处理与环境健康之初探—基于南京市电动自行车废旧电池调研的思考
Research on the Disposal of E-Bike Battery and Environmental Health Problems—Based on the Thought of Nanjing E-Bike Waste Battery Survey
 [PDF]

马伯虎, 郭素玲, 徐帅, 严伟奇, 肖树坚, 刘敏琪, 吴麟鑫, 薛婷, 许丹丹
Advances in Environmental Protection (AEP) , 2016, DOI: 10.12677/AEP.2016.62B003
Abstract:

本文以中国的南京市为案例地进行调研,在肯定了中国电动自行车发展对防治空气污染做出贡献的同时,对电动自行车废旧电池处理不当可能给土地和地下水造成环境污染及重金属污染等引发的环境健康问题进行了初步探讨。本文通过走访、小实验、问卷及网络调查等调研手段获得第一手资料,发现目前南京市场上的电动自行车需要经常更换电池,废旧电池数量庞大,而且废旧电池的污染和处理现状堪忧,废旧电池处理不当带来的环境污染和环境健康问题突出,但是南京市居民对电动自行车废旧电池的处理等环境污染及环境健康问题认识不足。在调研的基础上本文提出建立电池身份证认证制度、开发新技术、使用新能源等一系列措施和建设性意见,希望对中国电动自行车废旧电池处理带来的环境污染和环境健康问题给与足够的重视和关注。本文对环境健康问题的探讨具有一定的现实意义。

In this paper, we affirm the contribution of electric bicycle to air pollution control in China and discuss the land and groundwater pollution caused by improper disposal of electric bicycle battery. We got firsthand knowledge through visits, small experiments, questionnaires and online survey research in Nanjing, China. We find that currently the demand of electric bicycles is so large that the disposal and pollution of waste batteries is worrying in Nanjing. However, there is a lack of awareness of Nanjing residents in handling used batteries and corresponding environmental pollution issues. Based on our survey, we suggest establishing a “cell identity authentication” system, developing new technologies and new energy sources. We hope Chinese enough attention will be given to environmental pollution caused by electric bicycle battery disposal. The debate on environmental health problems in this article has a certain practical significance.

Estudio de los hábitos alimentarios de los ciclistas de la selección espa?ola de mountain bike
Som Castillo,A.; Sánchez Mu?oz,C.; Ramírez Lechuga,J.; Zabala Díaz,M.;
Nutrición Hospitalaria , 2010,
Abstract: objective: the aim of the study was to determine the feeding habits of the cyclists of the spanish mountain bike (mtb) national team. method: forty cyclists were distributed in two categories according to time spent in training and competing category (25 cadet/junior (c/j) -16.68 ± 0.99 years-, and 15 under-23/elite (u23/e) -25.33 ± 4.25 years-. all the subjects completed a specific questionnaire about their feeding habits. descriptive and contrast (mann-whitney) statistic was carried out in the 2 studied groups. results: seventy six per cent of the subjects of the c/j group showed incorrect feeding habit, and significantly less (36%) than the u23/e showed also incorrect patterns (p = 0.003). seventy six per cent of the c/j and 60% of the u23/e do 3 intakes/day (p = 0.348), while 20% of c/j and 26.7% of the u23/e do 5 intakes/day. sixty four per cent of the c/j and 26% of the u23/e eat between meals (p = 0.024). also, 56% of c/j group and 20% of the u23/e group eat "fast food" (p = 0.028). conclusions: feeding habits of the c/j cyclists of the spanish national team are considered inadequate, being significantly better for the u23/e group, although also in this older group there are basic aspects to improve.
Estudio de los hábitos alimentarios de los ciclistas de la selección espa ola de mountain bike Analysis of the feeding habits in cyclists of the Spanish national mountain bike team
A. Som Castillo,C. Sánchez Mu?oz,J. Ramírez Lechuga,M. Zabala Díaz
Nutrición Hospitalaria , 2010,
Abstract: Objetivo: Conocer los hábitos alimentarios de los integrantes de la selección nacional de ciclismo en la disciplinade mountain bike (MTB) para mejorar su rendimiento. Método: Cuarenta ciclistas fueron distribuidos en dos grupos atendiendo al nivel de dedicación mostrado y categoría (25 Cadetes/juniors (C/J) -16,68 ± 0,99 a os- y 15 sub23/élites (S23/E) -25,33 ± 4,25 a os-. Todos los sujetos completaron un cuestionario específico acerca de sus hábitos alimentarios. Se realizó una estadística descriptiva y de contraste (Mann-Whitney) entre los grupos establecidos. Resultados: El 76% de los sujetos pertenecientes al grupo de C/J muestran un incorrecto hábito alimenticio, siendo este porcentaje del 36% en el grupo de S23/E (p = 0,003). El 76% de los C/J y el 60% de los S23/E realizan 3 ingestas al día (p = 0,348), mientras que el 20% de los C/J y el 26,7% de los S23/E afirman realizar 5 tomas al día. El 64% de los C/J y el 26% de los S23/E manifiestan "picar" entre horas (p = 0,024). Por último, el 56% de los C/J y el 20% de los S23/E manifiestan ingerir alimentos precocinados(p = 0,028). Conclusiones: Los hábitos alimentarios de los ciclistas C/J de la selección espa ola de MTB no eran los adecuados, considerándose mejores los de los S23/E, aunque con importantes aspectos básicos a mejorar. Objective: The aim of the study was to determine the feeding habits of the cyclists of the Spanish mountain bike (MTB) national team. Method: Forty cyclists were distributed in two categories according to time spent in training and competing category (25 Cadet/junior (C/J) -16.68 ± 0.99 years-, and 15 Under-23/elite (U23/E) -25.33 ± 4.25 years-. All the subjects completed a specific questionnaire about their feeding habits. Descriptive and contrast (Mann-Whitney) statistic was carried out in the 2 studied groups. Results: Seventy Six per cent of the subjects of the C/J group showed incorrect feeding habit, and significantly less (36%) than the U23/E showed also incorrect patterns (p = 0.003). Seventy six per cent of the C/J and 60% of the U23/E do 3 intakes/day (p = 0.348), while 20% of C/J and 26.7% of the U23/E do 5 intakes/day. Sixty four per cent of the C/J and 26% of the U23/E eat between meals (p = 0.024). Also, 56% of C/J group and 20% of the U23/E group eat "fast food" (p = 0.028). Conclusions: Feeding habits of the C/J cyclists of the Spanish national team are considered inadequate, being significantly better for the U23/E group, although also in this older group there are basic aspects to improve.
Evolution in the train mode travel times at the Metropolitan Region of S o Paulo [paper in Portuguese]
Carlos Eduardo Paiva Cardoso
Journal of Transport Literature , 2011,
Abstract: The aim of this study was to evaluate the distribution and the evolution of train and walking time travels (walks in the beginning and in the end of trips to access this mode of transportation) in the Metropolitan Region of S o Paulo. For the analysis it will be used the S o Paulo Metro Origin/Destination (OD) Research for the years of 1997, 2002 and 2007. The result of this analysis enabled us to understand the growth of train travel - about 70% larger than the population growth in the Metropolitan Region, about 15% in these 10 years - and also the increasing of the average travel time related to this mode of transportation. Concerning to the walkings made to access this mode of transportation, it was found that about 500 thousand had their time greater than or equal to 15 minutes. The spatial distribution of these hikes was analysed considering they could be transformed into bike trips, through the development of public policies for this purpose . We also compared the number of walkings to access the train stations to the number of vacancies in the bike parkings.
A resposta de frequência cardíaca durante as competi??es de "mountain bike cross-country"
Costa, Vitor Pereira;Oliveira, Fernando Roberto de;
Revista Brasileira de Educa??o Física e Esporte , 2010, DOI: 10.1590/S1807-55092010000300009
Abstract: the aim of this study was to verify and describe the intensity profile of cross-country mountain-biking races using heart rate (hr) recorded during races. fourteen mountain bikers participated in two groups: elite (n = 6; 26.5 ± 3.6 years old; 69.1 ± 2.1 kg; 174.0 ± 1.2 cm; 5.9 ± 0.9 % bf; 9.0 ± 1.3 years of training) and amateurs (n = 8; 25.6 ± 7.7 years; 67.7 ± 7.0 kg; 175.5 ± 5.5 cm; 5.8 ± 2.1 % bf; 8.3 ± 5.7 years of training). each cyclist was submitted to an incremental exercise test to determine the metabolic thresholds and the hr values at each threshold. after four days, only the athletes of elite category were tested during brazilian round of xco world cup. two weeks later both groups were evaluated in xco brazilian national championship. the results showed that hr averaged 91-92% of hrmax. the exercise intensity zones showed different percentage of time spent during the races (10.0-14.8% easy; 23.1-30.1% moderate; 55.1-66.9% hard). this study shows that cross-country events are conducted at very high intensity, especially at the start of the race.
Operations Management of Mobike in China  [PDF]
Zhen Li
Open Journal of Business and Management (OJBM) , 2018, DOI: 10.4236/ojbm.2018.63052
Abstract:
Bike sharing is a booming industry in China during the past two years. Mobike, one of those bikes sharing companies, has distinguished itself from the competitors by its operations management. This essay focuses on the evaluation of how Mobike Company manages their bikes and how does the company control their quality. The bike sharing company needs to fulfill the demand during rush hour so it is an inevitable issue about capacity, inventory and control to a bike sharing company. At last, the essay gives recommendations related to the evaluations for improvement.
Características cinemáticas da pedalada em ciclistas competitivos de diferentes modalidades
Carpes,Felipe; Dagnese,Frederico; Bini,Rodrigo; Diefenthaeler,Fernando; Rossato,Mateus; Mota,Carlos B.; Guimar?es,Ant?nio C. S.;
Revista Portuguesa de Ciências do Desporto , 2006,
Abstract: the purpose of this study was to compare the pedaling kinematics of cyclists of two different disciplines (road and mountain-bike). data collection and analysis were accomplished using the peak motus system, and the angular kinematics behavior for the thigh, knee and ankle were analyzed while the cyclists pedaled in relative intensity to the second ventilatory threshold. the results were statistically compared by student?s t-test to every 30° of crank, showing no statistically differences among the cycling disciplines. however, the ankle kinematics presented high variability. this characteristic found for the ankle may be a decisive factor related to the differences in the pedaling technique among cyclists of these two disciplines.
Optimization of Chassis of an All Terrain Vehicle
D.Nagarjuna,Junaid Mohammed Farooq,,A.S.N.Saiteja,,P.Siddhartha Sri Teja
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: In the case of vehicles, the term chassis means the frame plus the running gear like engine, transmission, driveshaft, differential, and suspension. An all-terrain vehicle (ATV), also known as a quad, quad bike, three-wheeler, or four-wheeler, is defined by the American National Standards Institute (ANSI) as a vehicle that travels on low pressure tires, with a seat that is straddled by the operator, along with handlebars for steering control. As the name implies, it is designed to handle a wider variety of terrain than most other vehicles. This paper deals with design of chassis frame for an All Terrain Vehicle and its Optimization. Various loading tests like Front Impact, Rear Impact, Side Impact, Roll over test etc have been conducted on the chassis and the design has been optimized by reducing the weight of the chassis.
Comparison of muscle activation during elliptical trainer, treadmill and bike exercise
H S?zen
Biology of Sport , 2010,
Abstract: The purpose of this study is to compare muscle activation during elliptical trainer (ET), treadmill (TM) and bike (B) exercise. Twenty three voluntary and healthy male athletes (age, 20.65±1.65 years; weight, 74.21±7.21 kg; height, 180.69±5.31 cm; Body Mass Index, 22.4±1.5) participated in our study. Study protocol was decided for three days. Measures were taken by using elliptical trainer on the first day, treadmill on the second day and bicycle device on the third. Exercise devices were run with 65 0metabolic pulse for six minutes and at the end of the sixth minute, surface electrodes were placed on Biceps Brachii, Triceps Brachii, Pectoralis Major and Trapezius of upper extremity muscle and on Gastrocnemius, Vastus Lateralis, Rectus Femoris and Gluteus Maximus of lower extremity muscles and Electromyography (EMG) activities were measured. According to the finding of the study, it has been found out that all of the measured upper extremity muscle were more activated by elliptical trainer compared to treadmill and bike exercise (p<0.05). Also, it has been found out that Gastrocnemius and Gluteus Maximus of lower extremity muscle were more activated by treadmill compared to other exercise devices (p<0.05). Rectus Femoris muscle was more activated by elliptical trainer compared to bike exercise (p<0.05). EMG results of Vastus Lateralis did not show any statically differences (p>0.05). In conclusion, due to the advantage of more upper extremity muscle activation, it has been thought that elliptical trainer is a device to be able to be used in rehabilitation and exercise science.
第1页/共15031条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.