A Review: Impact of Static and Impact Load on the Mechanical Properties of Plastic Concrete

This review search seeks to know how the replacement effect on concrete is by replacing aggregate (coarse or fine) with plastic granules. Plastic does not dissolve in the climate and provides an early warning for collapses when mixed with concrete to give it more flexibility, making it more crucial to resist tensile stresses, increasing its strength, and seeking to make it more durable. The use of plastic is expanding day by day because of the rapid population increase and their constant demand. Every day, this causes a considerable amount of rubbish, which is harmful and causes pollution and plastic materials to take hundreds of years to dissolve. Solid waste management is currently a difficulty in any country, and the large-scale depletion of resources is causing environmental issues. For the concrete business, an alternative or alternative product must be produced. Plastic waste is the most challenging problem in solid waste management globally. In many countries, concrete has been one of the most excellent solutions for construction materials. It has hastened the pollution of the environment. It would be worthwhile to use plastic waste in concrete to solve the dual problems of a lack of raw materials and the safe disposal of plastic trash. This research aims to see if waste plastic can be used as a fine aggregate in concrete

Integration of Knowledge Management System in Telecommunication: A Case Study of Saudi Telecom

Accelerated business growth has pushed telecommunication companies to implement knowledge management systems to systematically manage knowledge created within the organization. This helps them to retain their competitive edge in the rapid changing telecom sector. This study plan to explore the emerging role of Knowledge Management (KM) system in telecommunication industry. Moreover it also encompasses KM issues related to people and technology in telecom sector. The results of this study are based on field interviews /observations and will be compared with existing body of research in the field

Comparison of homotopy analysis method and homotopy-perturbation method for purely nonlinear fin-type problems

In this paper, the homotopy analysis method (HAM) is compared with the homotopy-perturbation method (HPM) and the Adomian decomposition method (ADM) to determine the temperature distribution of a straight rectangular fin with power-law temperature dependent surface heat flux. Comparisons of the results obtained by the HAM with that obtained by the ADM and HPM suggest that both the HPM and ADM are special case of the HAM

Dissimilar Welding and Joining of Magnesium Alloys: Principles and Application

The growing concerns regarding fuel consumption within the aerospace and transportation industries make the development of fuel-efficient systems a significant engineering challenge. Currently, materials are selected because of their abilities to satisfy engineering demands for good thermal conductivity, strength-to-weight ratio, and tensile strength. These properties make magnesium an excellent option for various industrial or biomedical applications, given that is the lightest structural metal available. The utilization of magnesium alloys, however, requires suitable welding and joining processes that minimizes microstructural changes while maintaining good joint/bond strength. Currently, magnesium are joined using; mechanical fastening, adhesive bonding, brazing, fusion welding processes or diffusion bonding process. Fusion welding is the conventional process used for joining similar metals. However, the application of any welding technique to join dissimilar metals presents additional difficulties, the principal one being; the reaction of the two metals at the joint interface can create intermetallic compounds that may have unfavorable properties and metallurgical disruptions which deteriorates the joint performance. This chapter investigates the welding and joining technologies that are currently used to join magnesium alloys with emphasis on the development of multi-material structures for applications in the biomedical industries. Multi-material structures often provide the most efficient design solution to engineering challenges

Iron Ore Tailings as Partial Replacement for Fine Aggregate in Concrete Production – Review

Normal River sand is one of the major components of concrete, generally termed fine aggregate. A large volume of sand is needed annually for construction work globally. Mining or extraction of sand from the river bed, ocean beds, beaches, and inland dunes is accompanied by several problems such as; lowering of the water table, sinking of bridge piers and erosion of river bed and instability of river bed on the environment, etc. To decrease these environmental impacts and the cost of conventional fine aggregates, alternative materials like mining waste have been studied by several researchers to replace partially fine aggregates in concrete production. Iron ore tailings (IOT) are one of the mining wastes obtained from the beneficiation process of iron ore concentrates. This paper presents an overview of the work carried out on the use of IOT as a partial replacement of fine aggregate in concrete and its effects on the workability, mechanical, and durability properties of concrete

Investment Banks’ Business Model Innovation Evidence from Saudi Arabia

The Investment bank industry is considered to be an essential element of not only the financial system but also the whole economy. Understanding multiple business models employed by multi-services industry such Investment bank is a matter of great significance for Investment banks’ executives, regulators and analysts. In 2008 the business model that had been employed by investment banks for almost two decades vanished due to the global financial crisis. Investment banks were forced to change and innovate their traditional business models. This research intends to develop a conceptual framework which helps to realize and study investment banks’ business models with the core components and related activities. Multiple business models mapping for investment banks is developed to give seniors executives core and possible activities and alternatives to innovate and change various business models for different lines including asset management, brokerage, investment banking and custody services. In addition, the business model (innovation) drivers are investigated to empirically explore the most powerful drivers on investment banks’ multiple business models (innovation), potential changes and degree of alteration on its activities for each business line. For these aims, a systematic literature review was carried to synthesise the recent advancements in the business model literature and explore how firms approach business model innovation. As result, a conceptual framework for business model (innovation) was developed, which encompasses four components value proposition, operational value, human capital and financial value. This framework can be utilized by practitioners as a 'navigation map' to determine where and how to change their business models. By using the qualitative methodology through semi-structured interviews with 29 senior executives from 10 fully-licensed investment banks in Saudi Arabia and secondary data including financial statements, annual reports and pillar III disclosures, the empirical study mapped the investment banks’ multiple business models and identified a business model for each business line. Sixteen activities for each business line were determined to provide core and possible activities and alternatives. This research contributes to our understating of managing and innovating multiple business models in the industry when investment banks should run these multiple business models. The Investment banks’ business models are different in terms of business lines, core offerings, clients, key assets, key process, revenue streams and costs structure. Over and above, each line shows diverse business models applied by investment banks. Furthermore, unlike other studies, this research contributed by investigating drivers that force investment banks to change their existing business models, the degree of changes and which activities did investment banks consider when responding to particular drivers. This study found that clients, crisis and economic changes, rivalry, top management and regulations are the five drivers forcing investment banks to not only embark on change events, but also carry out business model changes in most investment banks’ business lines

Evaluating human factors of information security awareness in Taibah University

Information security for organizations such as educational sectors is gaining more importance as the implementation of technical solutions deployed to increase business efficiency. Information security technological implementation is insufficient to withstand threats that evolve with wider implementations of technologies the more technology is implemented the more threat probability pushes in. The fact that information security relies on three ties which are the technology, process and people. Processes can govern people behaviour by policies, however people still need a broader understanding of process and technology to be aware of expected threats and how their attitude and behaviours are going to evolve. Information security awareness indicates the understanding and behaviour of in information security. The information security awareness of employees should be measured to improve control strategies such as training or to determine the security maturity of an organization. In this research an adequate instrument, the Human Aspects Information Security Questionnaire (HAIS-Q). This instrument was administered to employees and students of Taibah University by an online web-based survey testing the knowledge, attitudes and behaviour across the models seven policy-based focus areas. Initial results indicate that HAIS-Q to be valid, reliable and suitable for comparable analysis. The model is able to measure information security awareness in its seven coverage focus areas. Results obtained indicated above average ISA level on tested sample using HAIS-Q model

Time scale Hardy-type inequalities with ‘broken’ exponent p

In this paper, some new Hardy-type inequalities involving ?broken? exponents are derived on arbitrary time scales. Our approach uses both convexity and superquadracity arguments, and the results obtained generalize, complement and provide refinements of some known results in literatur

Rethinking Ductility -- A Study Into the Size-Affected Fracture of Polymers

Ductility quantifies a material's capacity for plastic deformation, and it is a key property for preventing fracture driven failure in engineering parts. While some brittle materials exhibit improved ductility at small scales, the processes underlying this phenomenon are not well understood. This work establishes a mechanism for the origin of ductility via an investigation of size-affected fracture processes and polymer degree of conversion (DC) in two-photon lithography (TPL) fabricated materials. Microscale single edge notch bend ($\mu$SENB) specimens were written with widths from 8 to 26 $\mu$m and with different laser powers and post-write thermal annealing to control the DC between 17\% and 80\%. We find that shifting from low to high DC predictably causes a $\sim$3x and $\sim$4x increase in strength and bending stiffness, respectively, but that there is a corresponding $\sim$6x decrease in fracture energy from 180 $J/m^2$ to 30 $J/m^2$. Notably, this reduced fracture energy is accompanied by a ductile-to-brittle transition (DBT) in the failure behavior. Using finite element analysis, we demonstrate that the DBT occurs when the fracture yielding zone size ($r_p$) approaches the sample width, corresponding with a known fracture size-affected transition from flaw-based to strength-based failure. This finding provides a crucial insight that ductility is a size-induced property that occurs when features are reduced below a characteristic fracture length scale and that strength, stiffness, and toughness alone are insufficient predictors of ductility.Comment: 17 pages, 6 figure

Series Solutions of Time-Fractional PDEs by Homotopy Analysis Method

The homotopy analysis method HAM is applied to solve linear and nonlinear fractional partial differential equations fPDEs . The fractional derivatives are described by Caputo's sense. Series solutions of the fPDEs are obtained. A convergence theorem for the series solution is also given. The test examples, which include a variable coefficient, inhomogeneous and hyperbolic-type equations, demonstrate the capability of HAM for nonlinear fPDEs