سبد خرید

CONCRETE BRIDGE ENGINEERING Performance and Advances

On-site investigation of concrete bridges may be necessary for a wide range of reasons which will generally be associated with assessment of either specification compliance, maintenance requirements or structural adequacy. Establishing the precise aims of inspection and testing is an essential prerequisite to all test programme planning including fundamental aspects such as selection of methods, location of test points and interpretation of results. On-site inspection and testing, other than superficial visual inspection, is seldom cheap as complex access arrangements are frequently necessary and procedures may be time-consuming. Furthermore, individual observations or test results are often inconclusive, and back-up testing coupled with considerable engineering judgement and experience are then required.

Corporate social responsibility performance and information asymmetry

Using Corporate Social Responsibility (CSR) performance scores from KLD STAT, we investigate whether CSR performance affects information asymmetry. We find that both positive and negative CSR performance reduce information asymmetry. Moreover, we find that the influence of negative CSR performance is much stronger than that of positive CSR performance in reducing information asymmetry. We also investigate the effect of informed investors on the CSR performance-asymmetry relation. We find that the negative association between CSR performance and bid-ask spread decreases for firms with a high level of institutional investors compared to those with a low level of institutional investors. This finding suggests that informed investors may exploit their CSR information advantage. Overall, our results suggest that CSR performance plays a positive role for investors by reducing information asymmetry and that regulatory action may be appropriate to mitigate the adverse selection problem faced by less-informed investors.

The unique and complementary effects of manufacturing technologies and lean practices on manufacturing operational performance

This study investigates the unique and complementary effects of manufacturing technologies and lean practices on operational performance of manufacturing firms. Despite the importance of understanding how various resources are interrelated within firms, there have been few studies focusing on this area. Using data collected from 186 manufacturing plants in Thailand, we found that both manufacturing technologies and lean practices have unique effects on a range of operational performance dimensions ,including quality, lead- time, flexibility, and cost. More importantly, however, we also found that both organizational resources have complementary (or synergistic) effects on those operational performance dimensions. Based on the research findings, we offer theoretical and practical insights which support the importance of building strong manufacturing technologies and lean practices that maximize operational performance.

Improving Power Line Utilization and Performance With D-FACTS Devices

This paper discusses the use of massivelydispersed mass-manufactured communicationsenabled sensor, power-converter and actuator networks to realize a smart, fault tolerant, controllable and asset efficient power grid. A critical unfulfilled need, power flow control on existing lines, is solved using many modules of a Distributed Static Series Compensator (DSSC) device that can be clamped on to existing power lines, and can be operated so as to control the impedance of the conductor – realizing the first in a family of Distributed Flexible AC Transmission System or D-FACTS devices. This approach promises important system-wide enefits including – increased line and system capacity; increased reliability; improved asset utilization; improved operation under contingencies; reduced environmental impact; incremental deployment; and rapid implementation.

Entrepreneurial SCM competence and performance of manufacturing SMEs

This study reviewed the literature and interviewed managers to discover the dimensions of a new construct called the entrepreneurial supply chain management competence of small and medium-sized enterprises. We measured entrepreneurial SCM competence in terms of five first-order constructs: innovation orientation, proactiveness orientation, risk-taking characteristics, relational capital, and coordination capability. We further proposed that this competence affects SMEs’ performance directly and indirectly via the firm’s SCM strategies. A set of survey data collected from automotive OEM suppliers in five ASEAN countries was used to test the research model. Results show that the five constructs are important dimensions of entrepreneurial SCM competence, and that they affect performance indirectly. Our findings provide valuable insights about the enablers of an SME’s SCM practices and their effects on firm performance.

Entrepreneurial SCM competence and performance of manufacturing SMEs

This study reviewed the literature and interviewed managers to discover the dimensions of a new construct called the entrepreneurial supply chain management competence of small and medium-sized enterprises.

Recycling of waste tire rubber in asphalt and portland cement concrete: An overview

Waste tires pose significant health and environmental concerns if not recycled and/or discarded properly. Over the years, recycling waste tires into civil engineering applications, especially into asphalt paving mixtures and portland cement concrete, has been gaining more and more interests. This review summarizes the recent advances in the use of waste tire rubber in asphalt and portland cement concrete. The use of crumb rubber in asphalt paving mixture has long been proven successful due to good compatibility and interaction between rubber particles and asphalt binder, leading to various improved properties and performance of asphalt mixtures. The rubberized asphalt mixtures also have shown good compatibility with two widely used sustainability technologies in asphalt paving industry – reclaimed asphalt pavement (RAP) and warm-mix asphalt (WMA). In comparison with its use in asphalt paving mixtures, recycling of waste rubber in Portland cement concrete has not been so successful due to two factors: (1) incompatibility in chemical property between rubber and cement paste and (2) the significant difference in stiffness resulting in stress concentrations. Various methods have been proposed to overcome the barriers to improve the performance of rubberized portland cement concrete, some of which have shown to be promising.

Reading Performance and Academic Achievement in Early Childhood Bilingual and Monolinguals

Relationship between reading performance and academic achievement is theoretically predictable. However, this relationship could be higher among early childhood bilingual (ECBL) students than monolingual peers. For evaluating this claim, two groups of randomly selected female second graders (150 Farsi speaking and 150 Farsi and Turkish speaking) were tested and compared on these characteristics. The measures used were Kormi-Nouri and associates’ tests of reading performance. Moreover, academic achievement was defined to be the average of scores obtained by students at their final school exams in Math, Science and Farsi. Analysis of regression was then performed to determine which construct served as the best predictor of academic achievement in both groups. Based on the results, ECBL girls were superior to their monolingual (ML) counterparts in all three areas. Findings also show that reading performance was a strong predictor of school achievement for both groups

Recycling of waste tire rubber in asphalt and portland cement concrete: An overview

Waste tires pose significant health and environmental concerns if not recycled and/or discarded properly. Over the years, recycling waste tires into civil engineering applications, especially into asphalt paving mixtures and portland cement concrete, has been gaining more and more interests. This review summarizes the recent advances in the use of waste tire rubber in asphalt and portland cement concrete. The use of crumb rubber in asphalt paving mixture has long been proven successful due to good compatibility and interaction between rubber particles and asphalt binder, leading to various improved properties and performance of asphalt mixtures. The rubberized asphalt mixtures also have shown good compatibility with two widely used sustainability technologies in asphalt paving industry – reclaimed asphalt pavement (RAP) and warm-mix asphalt (WMA). In comparison with its use in asphalt paving mixtures, recycling of waste rubber in Portland cement concrete has not been so successful due to two factors: (1) incompatibility in chemical property between rubber and cement paste and (2) the significant difference in stiffness resulting in stress concentrations. Various methods have been proposed to overcome the barriers to improve the performance of rubberized portland cement concrete, some of which have shown to be promising

Training, motivation, and performance: The case of human resource management in construction projects in Mashhad, Iran

An enterprise’s productivity is closely correlated with its people and strategies; therefore, a forceful human resource management system is the most valuable asset of the current century construction companies. Purpose/design/methodology/approach: Based on a combination of literature review and questionnaire surveys, this paper explores the execution of construction workers training and motivation methods in HRM practices by the survey respondents’ companies and the effects on the companies’ performances. The research was conducted by sending 120 sets of questionnaires to the nominated companies and firms in Mashhad, Iran. A quantitative research approach was adopted requiring the development and dissemination of a questionnaire survey. The analysis method in this research is mainly descriptive and the type of investigation is co-relational study. Findings: The research exposes some barriers in the training and motivation of the construction workers and provides solutions for the government and companies in Iran. Also, it reveals the effects of unskilled labour on the quality of construction projects in Mashhad. Research limitations/implications: Future research should be under taken to address how companies and governments adapt to and shape the environmental and organizational settings in such a way that the context optimally stimulates workers motivation and participation in training courses and effects on increasing the quality of construction

درحال بارگذاری ...