市政工程施工技术通病分析与对策

市政工程是城市基本设施和公共设施建设的工程,是推动城市经济发展的主要动力,是满足人们出行、用水用电、通讯、生态环境等需求的公用工程。市政工程施工技术水平的高低会直接影响市政工程整体施工质量,因此要加大对市政工程施工技术的管理控制,以提高市政工程成品质量,保证公共基础建设能够给人们提供更优质、更便利的生活。本文将对市政工程施工技术中存在的共性问题进行探讨,并提出针对性的解决方案,提高市政工程整体质量。

Vibration Behavior of the Ground and Houses Caused by Monorail Traffic

The vibration behavior of the ground and houses caused by monorail traffic is discussed in this paper. The environmental ground vibration problem discussed herein occurs in a residential area near a monorail used for public transportation, Vibrations were measured on the ground at the side of monorail piers lacing the residential area and within the affected houses. Results indicate that the vibration level in the house was 60 dB or more, a level high enough to warrant complaints, Peculiar geological and geographical features are thought to contribute to the amplification of low frequency （-10 Hz） ground vibrations to irritable levels in these homes even though a distance of≥30 m separates the residential area and the monorail.

Simultaneous optimization of transit network and public bicycle station network

The traditional manner to design public transportation system is to sequentially design the transit network and public bicycle network. A new public transportation system design problem that simultaneously considers both bus network design and public bicycle network design is proposed. The chemical reaction optimization(CRO) is designed to solve the problem. A shortcoming of CRO is that, when the two-molecule collisions take place, the molecules are randomly picked from the container.Hence, we improve CRO by employing different mating strategies. The computational results confirm the benefits of the mating strategies. Numerical experiments are conducted on the Sioux-Falls network. A comparison with the traditional sequential modeling framework indicates that the proposed approach has a better performance and is more robust. The practical applicability of the approach is proved by employing a real size network.

NGO的经济解释

NGO在本质上不是一种交易机制。

Analysis on the Effect of Beijing＇s Traffic Control Policies

With the rapid development of economy and motorization, the traffic congestion and environmental problems have become more and more serious day by day in Beijing. Therefore, traffic control policies have been gradually adopted by Beijing municipal government since 2008, so as to ease traffic and environmental problems. In this paper, the background and current situation of Beijing to implement traffic control policies are introduced, and also this measure is analyzed and evaluated from traffic effect, environmental effect, motor vehicle development, urban road development, public transport development, and balance between supply and demand, etc. Finally, related conclusions are drawn up as follows： an induced traffic volume will be generated by traffic control policies, and the effect of the traffic control will be erased by the natural growth rate of motor vehicles in three years; public traffic service should be improved for better making traffic control policies; the traffic congestion and environmental problems are alleviated by traffic control policies in the short term, but can＇t be fundamentally solved in the long run; traffic control policies should cooperate with other traffic demand management policies for reducing demands, and traffic condition should be optimized in both time and space, so that the traffic congestion and environmental problems will be fundamentally solved.

Public Transit Connectivity Measures and Analysis of Weak Segments

Bus and any other public transit connectivity issues facilitate an understanding of the importance of transit planning in enhancing existing or new transit services. Improving transit connectivity is one of the most vital tasks in transit-operations planning. A poor connection can cause some passengers to stop using the transit service. Service-design criteria always contain postulates to improve routing and scheduling coordination （intra- and inter-agency transfer centers/points and synchronized/timed transfers）. Ostensibly the lack of well-defined connectivity measures precludes the weighing and quantifying of the result of any coordination effort. This work provides an initial methodological framework and concepts for （1） quantifying transit connectivity measures and （2） directions and tools for detecting weak segments in inter-route and inter-modal chains （paths） for possible revisions/changes.

浅析建筑工程质量管理通病及防治对策

建筑工程施工质量关系到整个建筑的安全稳定性,而影响施工质量的关键因素,便是施工技术。所以要提升建筑工程施工技术的管控效果,强化建筑工程质量管理工作,确保工程施工质量符合标准要求,提升建筑的安全性。基于此,本文便对建筑工程中,质量管理的通病进行分析,同时提出有效的防治对策。

市政工程施工技术通病分析与对策

市政工程是城市基本设施和公共设施建设的工程，是推动城市经济发展的主要动力，是满足人们出行、用水用电、通讯、生态环境等需求的公用工程。市政工程施工技术水平的高低会直接影响市政工程整体施工质量，因此要加大对市政工程施工技术的管理控制，以提高市政工程成品量，保证公共基础建设能够给人们提供更优质、更便利的生活。本文将对市政工程施工技术中存在的共性问题进行探讨，并提出针对性的解决方案，提高市政工程整体质量。

Time analysis of fatal traffic accidents in Fars Province of Iran

Objective： To analyze the time factor in road traffic accidents （RTAs） in Fats Province of Iran. Methods： This study was conducted in Fars Province, Iran from November 22, 2009 to November 21,2011. Victims＇ information consisted of age, sex, death toll involving dri- vers or passengers of cars, motorcycles and pedestrians, and site of injury etc. Accidents were analyzed in relation to hour of the day, season of the year, lighting condition in- cluding sunrise, sunset, daytime and nighttime. Results： Atotal of 3 642 deaths （78.3% were males, and the ratio of males to females was about 3.6：1） were studied regarding their autopsy records. There was a steady in- crease in fatal accidents occurring at midnight to 15：59. The risk of being involved in a fatal traffic accident was higherfor those injured between 4：00 to 7：59 than at other times （OR=2.13, 95% C11.85-2.44）. The greatest number of fatal RTAs took place in summer. Mortalities due to RTA during spring and summer were more pronounced at 20：00 to 23：59 and midnight to 3：59, whereas mortalities in fall and winter were more pronounced from 12：00 to 15：59. Conclusion： The high mortality rate ofRTAis a major public health problem in Fars Province. Our results indicate that the time is an important factor which contributes to road traffic deaths.

Epidemiology of patients admitted to a major trauma centre in northern India

Objective： Trauma in India is an increasingly significant problem, particularly in light of rapid development and increasing motorization. Social changes are resulting in alterations in the epidemiology of trauma. The aim of the study was to assess the various epidemiological parameters that influence the cause of injury in the patients admitted to a major trauma centre in northem India. Methods： An observational study of 748 patients chosen by random assortment was carried out over a peri- od of 1 year （August 2008 to July 2009）. Age, sex, injury type and pattern were noted. Injury mode of upper and lower limbs was also noted. Results： Injuries occur predominately in the age group of 15-30 years. Males incurred more injury with male to female ratio of 6：1. The most vulnerable group was motorcycle users. Among the injured, farmers were the most commonly involved. Blunt injuries （94.92%） were much more common than penetrating injuries. Among patients with head injury, two wheelers related accidents were the most common （40.3%）. Most spinal cord injuries were caused by falls from height （51.09%）. Most lower limb fractures were simple type. Compound fractures of the lower limb were more common than up- per limb fractures. Conclusion： Strict enforcement of traffic rules, combined with improved infrastructure and behavior change can decrease the burden of road traffic accidents in India and other developing countries. This study could assist in raising the profile of road traffic accidents as a public health problem which needs to be addressed as a preventable cause of mortality and morbidity, and plan- ning appropriate interventions for this major challenge. Preventive strategies should be made on the basis of these epidemiological trends.

Uniform convergence of the p-Bieberbach polynomials in domains with zero angles

Let G C C be a simply connected domain whose boundary L ：= G is a Jordan curve and 0 ∈ G. Let w = φ（z） be the conformal mapping of G onto the disk B（0, r0） ：= {w ： ｜w｜ 〈 r0）, satisfying φ0（0） = 0, φ＇t（0） = 1. We consider the following extremal problem for p 〉 0：∫∫G｜φ＇（z）-P＇n（z）｜Pdσz→min in the class of all polynomials Pn（z） of degree not exceeding n with Pn（0） = 0, P＇n （0）=- 1. The solution to this extremal problem is called the p-Bieberbach polynomial of degree n for the pair （G, 0）. We study the uniform convergence of the p-Bieberbach polynomials Bn,p（z） to the φ（z） on G^- with interior and exterior zero angles determined depending on the properties of boundary arcs and the degree of their ＂touch＂.