Upheaval buckling of pipelines

UPHEAVAL BUCKLING OF OFFSHORE pipelines occurs as a result of axial compression induced along the pipelines due to large temperature differences and high internal pressures. This paper aims to research the causes of upheaval buckling, give an overview of the analytical methods, and develops an Excel spreadsheet for initial assessment. Several models of upheaval buckling have been identified and discussed, such as those based on idealized or perfect pipelines, which are related to the railway track analysis and those based on imperfections. The buckle temperatures of the perfect pipelines are proportional to the buckle lengths and axial forces. With the consideration of imperfections, buckle temperatures become inversely proportional to the imperfection heights, therefore larger imperfections would require smaller temperatures to propagate upheaval buckling. Increasing the downward load on the pipelines aids the prevention of upheaval buckling. Also, relevant methods to mitigate against the occurrence of upheaval buckling have been discussed. The use of finite-element analysis which considers the seabed profile and plastic deformation of pipe wall would be suitable for precise analysis

Extruded flakes from pearl millet (Pennisetum glaucum)-carrot (Daucus carota) blended flours-production, nutritional and sensory attributes

Open Access JournalMillet flour (M) and carrot flour(C) were produced and blended in the ratios 100M:0C, 95M:5C, 90M:10C, 85M:15C and 80M:20C respectively to produce extruded flakes. The composite flours were subjected to analysis of the proximate and mineral composition, as well as functional and pasting properties. Extruded flakes were analyzed for proximate composition, total carotenoids, colour and sensory evaluation. There was no significant difference (p > 0.05) in the proximate, functional and pasting properties but there were significant differences (p 0.05) affected by extrusion cooking. In terms of the lightness (L*), redness (a*) and yellowness (b*), 100% millet flakes had the least values of 50.09, 0.076 and 10.39 respectively. Sample with 85M:15C had the overall acceptance score of 7.25. In terms of colour and taste, the sample with 90M:10C had the highest scores of 8.50 and 6.50 respectively. Sample with 85M: 15C was most preferred in terms of crunchiness. The results indicate that pearl millet and carrot are rich in different nutrient when blended in the right proportions to make composite flour, it would produce nutrient-dense food product rich in protein, vitamin Aand minerals

Adoption of web-based order-processing systems: experiences from tier-1 suppliers in the automotive supply chain

This research studies automobile industry suppliers in Thailand, who have implemented VMI using web-based order-processing technology. It examines their motivations and barriers for implementing the technology, and identifies the enabling factors with greatest impact on the outcomes of such implementation. Data was obtained from 70 tier-1 suppliers of the two biggest automobile assemblers in Thailand. Exploratory factor analysis was used to construct motivation, enabling factors, difficulties/barriers and outcomes of web-based order-processing technology implementation. Multiple linear regression was then used to examine the relationships between enabling factors and operational outcomes. The results show that improving customer responsiveness and the need to retain competitive advantage rather than cost-based orientation were the primary drivers of implementation of web-based order processing. This case provides insights to enable successful implementation by organisations that are planning to deploy the technology, particularly in the early stages of technological diffusion in emerging economies

Experimental investigation of the performance of different modulation techniques under controlled FSO turbulence channel

This paper experimentally investigates and compares the performance of the free space optics system employing three different modulation schemes, on-off keying (OOK) with nonreturn- to-zero (NRZ) and return-to-zero (RZ) and the binary phase shift keying (BPSK) operating under the turbulent atmosphere. The received average signal is measured and used to characterize the strength of the turbulence. The experiment is performed with a temperature gradient of 4 degrees at a wind velocity of 4 m/s. The temperature gradient within the controlled channel results in turbulence of a log irradiance variance of 0.002, which is classified as a very weak turbulence. The received signal eye diagram and power histograms are presented and analyzed for performance evaluation of the selected modulation schemes in the weak turbulence model

Experimental study of bit error rate of free space optics communications in laboratory controlled turbulence

This paper reports experimental results for the performance of an free space optical (FSO) communication link employing different modulation schemes under the influence of the atmospheric scintillation. A dedicated experimental atmospheric simulation chamber has been developed where weak and medium turbulence can be generated and its effect on the FSO link is investigated. The experimental data obtained is compared to the theoretical prediction. The paper also shows that the effect on the data transmission performance depends on the position of turbulence source positioned within the chamber

The relationships between firm's strategy, resources and innovation performance: resources-based view perspective

Besides basic competitive priority (quality, cost, delivery and flexibility), innovation has been recognised as one of the primary sources of competitive advantage for manufacturing industry to compete in global markets. This paper, therefore, presents an empirical study on the relationship between firm strategy, resources and innovation performance. Drawing from the grounded theory of resource-based view, and using 218 responses from Thai production/operation managers, this paper shows that differentiation strategy had a positive relationship with both internal capital or internal resources (represented by knowledge and creativity management) and networks capital or external resources (represented by customer and supplier network). The findings also revealed that only internal capital had a positive effect on innovation performance. Finally, contributions to industry practitioner, academia and national agency in supporting and promoting innovation are presented

Prioritization of six-sigma project selection: A resource-based view and institutional norms perspective

Purpose – With increasing choice from a range of programs, improvement project selection within broader supply chain context and resource constraints has become a major research challenge. The purpose of this paper is to investigate the different criteria for selecting Six-Sigma (SS) projects based on previous studies. The study is supported by two grounded theories: resource-based view and institutional norms. The criteria include: first, business drivers for improvement and the common performance metrics deployed; second, the organization’s stakeholders needs; and third, process owner’s needs. Design/methodology/approach – To determine the relative importance of influencing factors, opinions were collected from 30 experienced practitioners including SS champions/master black-belts, company directors, consultants, and process owners through a series of interviews in small, medium, and large organizations including multi-national organizations. The evaluation of criteria is based on analytical hierarchy process. Findings – The results show that impact on customer, financial impacts, and impact on operational goals are the most significant factors in selecting SS improvement project. Originality/value – This study is a first attempt to determine the relative weight among SS project selection criteria, which help the practitioner to allocate their limited resources in implementing SS project

E-business capabilities in developed and developing countries: Different or the same?

This paper compares the e-business capabilities in developed and developing countries; in particular the awareness and usage of e-business tools and the barriers / drivers of adoption. We surveyed 136 managers of organizations (in both developed and developing countries) and analyzed the responses via the SPSS Statistics software package. A number of statistically significant differences were found between the 2 sets of organization; interestingly, however, a number of areas showed minimal difference between the 2 sets of organizations, suggesting the gap between them beginning to close

Deploying business excellence – success factors for high performance

Purpose – The purpose of this paper is to improve the understanding of how organisations successfully deploy business excellence (BE) by comparing the tools and strategies implemented by organisations at different levels of BE maturity. Design/methodology/approach – The study used a combination of a questionnaire, discussion groups and interviews with respondents including private sector organisations across India, Japan, Republic of China, Singapore and Thailand. These countries were selected due to them being considered as having the most advanced BE organisations in Asia by the Asian Productivity Organisation (APO) that commissioned the study. Once triangulated, the quantitative data were analysed through use of the IBM SPSS Statistical software package. Findings – The study has shown that on average, organisations with higher BE maturity outperform their less mature counterparts. The study also revealed that organisations with a high BE maturity were more likely to use specific tools and were more likely to use some of these tools more effectively. Finally, the study identified differences in strategic approaches to BE between organisations with high and low BE maturity. Research limitations/implications – Only five Asian countries were considered due to resource limitations. However, the study of 74 organisations represents one of the most comprehensive to date with 30 of these organisations being award winners. Practical implications – The findings offer guidance to those organisations wishing to progress from a low level of BE maturity to a more advanced level. The findings have already assisted the APO and its 20 member countries in the development and implementation of strategic interventions at a regional and national level. Originality/value – No other study in Asia has been conducted on such a large sample of BE-orientated organisations. The study was also unique in its focus on the tools and strategies that should be used for successful BE deployment. In addition, the study is one of only a few in Asia that has studied the results of BE on organisational performance

Business improvement tools and techniques: a comparison across sectors and industries

The purpose of this study was to investigate the awareness, usage, perceived effectiveness and potential future use of improvement tools and techniques via two sets of comparisons: between public and private sector organisations, and between manufacturers and service organisations. The need for the study was driven by the current lack of understanding of the extent of improvement tools and techniques adoption on a global scale. A questionnaire survey of 453 respondents from over 20 countries was conducted and the quantitative data were analysed through use of the IBM SPSS software package. The study’s findings indicated that there are no significant differences between both sets of organisations for the majority of improvement tools and techniques. However, this study has shown that public sector organisations are more likely to adopt some improvement tools and techniques in comparison to their private sector counterparts. Similarly, service organisations are also more likely to adopt some improvement tools and techniques than their manufacturing counterparts. These results contradict the conventional perception that improvement tools and techniques are used more often by the private sector and manufacturing organisations