探究市政道路沥青路面工程的检测要点

当前,我国的城市化速度日益加快,城市中的车流量日益增大,这就给城市的道路路面工程造成巨大荷载压力,许多路面出现不同程度的破坏,影响了城市的交通安全。在这种情况下,对沥青路面工程的检测就显得尤为关键。而要做好沥青路面检测,就需要我们充分掌握检测要点。因此,本文就沥青路面工程的检测要点进行了初浅的探究。     

公路工程中沥青路面混合料离析与反射裂缝成因分析

公路工程中的混合料离析与反射裂缝是造成沥青路面早期损坏的原因之一,本文在分析现有文献的基础上,介绍了沥青混合料离析的种类、路面离析的检测与判定方法,沥青路面反射裂缝的形成机理以及主要影响因素,并提出了沥青混合料的离析判别标准及防治措施。     

沥青路面施工质量控制与早期损害分析

引起沥青路面早期损害的因素很多,其中的主要因素是施工技术水平低和质量控制管理薄弱。我国目前沥青路面施工技术总体水平有了显著提高,但施工质量控制管理体系还不完善。本文分析沥青路面施工质量控制的现状和主要问题,结合沥青路面施工质量控制工程实践,对沥青路面施工质量控制进行了系统研究分析,提出应充分考虑影响质量的各个因素,从系统、过程、整体的角度进行沥青路面施工质量控制,总结并提出沥青路面施工质量控制主要原则。     

浅析沥青路面机械摊铺工艺

近年来,随着经济的发展,我国公路建设事业也在不断地发展,对公路施工技术不断提出了新的要求。沥青路面的摊铺是现代公路建设中重要的一环,沥青路面的平整度直接影响到整个公路工程的质量。本文仅针对沥青路面机械摊铺工艺进行简单的探讨。     

高速公路沥青路面建设质量探讨

针对高速公路沥青路面使用现状,论述了影响高速公路沥青路面建设质量的一些问题及由此引发的思考,以供从事高速公路沥青路面科研、设计、施工等有关人员参考。     

沥青路面常见病害原因分析与处治措施研究

沥青是现代公路施工最常用的采用材料,沥青路面是现代公路施工的主要路面之一,具有较高的技术要求。沥青路面由于施工以及自身原因,容易出现各种病害,影响交通运行安全,提高沥青路面的安全性具有现实意义。分析沥青路面常见的几种病害以及病害产生原因,探究病害处理方法与措施,以此来延长沥青路面的使用年限,提高路面行车的安全性。     

公路沥青路面施工与养护质量控制研究

公路沥青路面施工与养护质量控制对于提升路面强度和使用寿命有着极大的助益。从公路沥青路面施工与养护现存问题入手,分析公路沥青路面施工与养护质量控制措施。     

沥青路面半刚性基层裂缝的危害及处治

为减少或延缓半刚性基层、底基层对沥青路面面层的反射裂缝,延长沥青路面的使用寿命,采用玻纤网、土工布对水泥稳定基层收缩裂缝进行处治。     

一种基于电学特性的沥青混凝土吸水状况推测方法

沥青路面在使用过程中不可避免会受到自然降水和地下水的影响,水分交替作用最终将导致沥青路面的水损害,而以往室内测定沥青混凝土含水率的方法无法对沥青路面的干湿状态进行快速评定。为了快速评定沥青路面的干湿状态,采用电学方法推测沥青混凝土的含水率。以密实型沥青混凝土电阻特性为依据,测量浸水前后沥青混凝土电阻率的变化,进而建立沥青混凝土吸水率与其电阻率的数学关系,以电阻率来推测沥青混凝土内部的含水率。结果表明,沥青混凝土含水率与电阻率对数值具有良好的线性相关性,沥青混凝土吸水率越大,电阻越小。所提方法可为不同沥青混凝土面层的干湿状况评定提供一定的借鉴。     

东北季冻区透水沥青路面低温抗裂性分析

为了将具有良好排水、抗滑性能的透水沥青路面应用于东北季冻区,对季冻区气候环境下的透水性沥青路面低温抗裂性进行建模.基于东北季冻区年/日温差大、冬季寒冷、冰冻期长等特点,依据沥青路面温度场理论,利用ABAQUS有限元分析平台建立透水沥青混凝土(OGFC)、密级配沥青混凝土(AC)路面结构温度场,并探讨了 2种材料路面结构...     

Comparing FTTH access networks based on P2P and PMP fibre topologies

There is an ongoing discussion in the market which Next Generation Access (NGA) architecture best suits future needs and which investment and cost differences exist. The discussion can be subsumed as P2P vs. GPON, which is somewhat misleading as this article reveals. The discussion is driven by the fact that the high capital cost and the long asset life time of fibre mean that the technology choices made today will dominate the opportunities for telecommunication business of all market players, incumbents, competitors, content providers and business and residential users for many years in the future.The paper analyzes the cost and other differences between Fibre-to-the-Home (FTTH) access network architectures and their related different wholesale approaches by using the well-known and understood steady state approach applied in other NGA analyses in the past. In addition to the steady state analysis a dynamic cost evaluation is included taking into account the different investment behaviour of the FTTH architectures over time. The results describe investment and cost differences between architectures, incumbents and wholesale based competitive operators. The analysis has been performed for different geotypes (clusters) of decreasing population density in a representative European settlement structure.     

Indigenous peoples’ nutrition transition in a right to food perspective

In indigenous communities the nutrition transition characterized by a rapid westernization of diet and lifestyle is associated with rising prevalence of chronic disease. Field work and literature reviews from two different policy environments, Argentina (Jujuy) and Canada (Nunavut), identified factors that add to indigenous peoples’ disease risk. The analytical framework was the emerging human right to adequate food approach to policies and programmes. Indigenous peoples’ chronic disease risk tends to increase as a result of government policies that infringe on indigenous peoples’ livelihoods and territories, undermining their economic system, values and solidarity networks. Policies intended to increase food security, including food aid, may also fuel the nutrition transition. There is a need to explore further the connection between well-intended policies towards indigenous peoples and the development of chronic diseases, and to broaden the understanding of the role that different forms of discrimination play in the westernization of their lifestyles, values and food habits. Food policies that take due account of indigenous peoples’ human rights, including their right to enjoy their culture, may counteract the growth of chronic disease in these communities.     

A strategic skill based model of supplier integration and its effect on supply management performance

Supplier integration is a tool to help organizations gain competitive advantage. Strategic supply management skills and the supply management function's perceived status are hypothesized as antecedents to supplier integration leading to supply management performance. The sample for this study includes 152 executive level supply management professionals. The empirical results suggest that strategic skills and perceived status are essential antecedents to supplier integration and subsequent performance. Further, the relationship between strategic skills and performance is mediated by supplier integration. Results of a dominance analysis also suggest which strategic skills are most likely to explain status integration, and performance. These findings have significant implications for supply management theory and practice.     

Cost allocation of WCDMA and wholesale pricing for mVoIP and data services

This study estimates cost-based prices for wholesale voice and data services provided to 3G (WCDMA) MVNOs according to their distinct types. For estimation, 3G MVNOs are classified into different types, and the overall cost of WCDMA facilities are separated into voice and data components based on their subscriber rates, actual traffic rates, as well as efficiency consideration of traffic rates. The study then calculates cost-based wholesale prices of voice and data services for each of the 3G MVNO types. The result of this study shows that a cost-plus pricing scheme can help achieve the policy goals of the regulator, namely, lowering telecommunications tariffs and facilitating the introduction of new convergent-type services, far more effectively than the current retail-minus pricing scheme. The findings of this study may assist firms in developing business models based on 3G networks and telecom regulators in designing policies related to interconnection, mVoIP, prepaid calls, wholesale services, and network neutrality.     

Collectivism,individualism, and outgroup cooperation in a segmented China

A consistent theme in cross-cultural management research is that collectivists are more cooperative than individualists. We use Hofstede's measure for individualism–collectivism and combine it with an experimental measure of cooperation to test this relationship in China. In contrast to the established paradigm, we find that groups with higher individualistic scores are more cooperative than those groups with higher collectivistic scores. We attribute these results to groups being composed of outgroup members. In addition, we find that subjects from the more developed coastal area are more individualistic and cooperative than are subjects from inland China.

电子产品的电磁兼容性设计

首先介绍电磁兼容性的基本概念与研究领域,然后重点阐述电子产品的电磁兼容性设计与测量。     

SPYRO在烯烃原料生产方案测算中的应用

文章对SPYRO裂解模拟软件在石化企业烯烃生产原料优化方案测算中的应用进行了比较深度的概括分析.结合该软件在上海石化的实际应用,认为在劣质化原油加工份额不断增加的趋势下,SPYRO裂解模拟软件有助于石化企业在烯烃生产原料优化选择、生产计划合理安排、原油加工生产效益比较等方面为企业相关决策者提供有效地帮助.     

施工企业工程项目部的建设浅论

工程项目的一次性决定了工程项目部的一次性，而工程项目成本中心与企业利润中心地位又辱致工程项目部的临时性，在工程项目实践过程中，项目经理部的一次性在实现其功能的过程中可能会产生很多局限和负面影响，故项目部应具有相对的稳定性，在此基础上，本对工程项目部建设实践进行了初步总结并提出了建议。     

European consumer preferences for beef with nutrition and health claims: A multi-country investigation using discrete choice experiments

The European Union (EU) nutrition labelling policy aims to facilitate consumers’ food choice, stimulate innovation and facilitate the circulation of foods bearing claims across countries. However, the beef industry has not fully taken advantage of utilizing nutrition and health claims based on the EU nutrition labelling policy to differentiate beef products in the market. This study investigates consumer preferences for nutrition and health claims on lean beef steak. Two choice experiments were conducted among 2400 beef consumers in four EU countries (Belgium, France, the Netherlands, United and United Kingdom). Multinomial logit and error component models were estimated. Our results generally suggest that consumer valuation of nutritional and health claims varies across countries. In Belgium, the Netherlands and France, nutrition and health claims on saturated fat yielded higher utilities than claims on protein and/or iron, while the opposite was found among consumers in the UK. The results imply that marketing opportunities related to nutrition and health claims on beef are promising, but that different nutritional marketing strategies are necessary within different countries.     

Social media as a useful tool in food risk and benefit communication? A strategic orientation approach

Although considerable progress has been made in understanding the determinants of risk perception and in identifying the necessary components of effective food risk and benefit communication, this has not been matched with the development of efficient and appropriate communication tools. Little work has been done examining the implications of the explosion of new media and web technologies, which may offer potential for improving food risk and benefit communication. First, this study examines the views of stakeholders (n = 38) and experts (n = 33) in the food domain on the potential use of these emerging media for food risk/benefit communication. Based on in-depth interviews in six European countries (Belgium, Ireland, Italy, Latvia, Spain and The Netherlands), strengths, weaknesses, opportunities and threats (SWOT) of social media in food risk and benefit communication were identified. Second, a Strategic Orientation Round (SOR) was used to evaluate the relative importance of the SWOT components according to stakeholders (n = 10) and experts (n = 13). Results show that both stakeholders and experts confirm a future role of social media in food risk and benefit communication. Strengths as speed, accessibility and interaction make social media an interesting tool in crisis communication or issue awareness raising. Weaknesses as the lack of a filter, low trust, the risk of information overload and a communication preference for traditional media are acknowledged.