Reusable Features Research Articles

State transformations of colliding optical solitons and possible application to computation in bulk media

Using explicit, bright-soliton solutions for the coupled Manakov system recently described by Radhakrishnan, Lakshmanan, and Hietarinta, we show that collisions of these solitons can be completely described by explicit linear fractional transformations of a complex-valued polarization state. We design sequences of solitons operating on other sequences of solitons that effect logic operations, including controlled NOT gates. Both data and logic operators have the self-restoring and reusability features of digital logic circuits. This suggests a method for implementing computation in a bulk nonlinear medium without interconnecting discrete components.

97/03872 Biomass and natural gas as co-feedstocks for production of fuel for fuel-cell vehicles

Object-oriented modelling languages have become in recent years a very attractive choice for the control-oriented, dynamic modelling of power plants, due to their ease of development, flexibility, and reusability features. The paper describes a hierarchical modelling framework for thermal power plants, based on the Modelica language and on an existing library of elementary models, with particular emphasis on combined-cycle plants. The design criteria of the framework are discussed, and demonstrated by examples. The implications for the modelling of advanced power plants of the future, such as IGCC plants, integrated fuel-cell and combined cycle plants, and plants with CO2 capture capabilities are finally discussed.

A Users Approach To Constructing The Business Reporting Model: An Internet-Based Research Case

This case aids the exploration of exploring the financial disclosure requirements proposed by the AICPA Special Committee on Financial Reporting (i.e., the Jenkins Committee). The premise of the Committees report was to propose a model for comprehensive business reporting that is closer in line with the needs of financial statement users. This case provides a reusable framework for investigating and report upon the availability of current information disclosures available for a given company and facilitates a comparison with those disclosures advocated by the Jenkins Committee. The re-usability feature is derived from the uniqueness that each company report will have based upon the information available for a given company at a given point in time. Hence, the case will differ for each student assignment in the same semester and will also differ from one semester to the next. Five primary objectives have been specifically addressed: (1) to raise students awareness of evolving issues I the accounting profession, (2) to facilitate students understanding of the real changes in current reporting that may evolve from the Jenkins Committee, (3) to understand the difficulties faced by financial statement users who currently must search for additional disclosures through multiple information sources of questionable reliability, (4) to provide a meaningful analysis of financial statement content and disclosures, and (5) to demonstrate how the Internet can be used as s tool for aggregating information when conducting business research and analysis.

Wastewater reuse in Jubail, Saudi Arabia

With the industrial development and urban construction in Madinat Al-Jubail Alsinaiya in Saudi Arabia, which has mostly arid regions and due to limited water resources depends on diminishing ground water and costly desalinated seawater, wastewater reuse is pursued using reclaimed municipal and industrial wastewater through treatment plants. This paper is an actual case study discussing the features of reuse, the processes used and the standards adopted. The effect of reuse upon the local environment is commented upon. This study also emphasizes the cost-competitiveness of wastewater reuse for irrigation in Saudi Arabia. Design data and operational results for the 19 MGD municipal wastewater water treatment plant and the 11 MGD industrial wastewater treatment plant will be discussed. Both plants utilize biological treatment followed by pressure filtration to meet the stringent standards governing the use of effluent in landscape irrigation. The effluent TDS, TSS, BOD 5 and SAR are valued 936, 4.4, 2.7, and 7.4, respectively, for the municipal wastewater treatment plant and 762, 2.1, 2.4 and 10.5, respectively, for the industrial wastewater treatment plant.

Economics of software utilization

Three models have been introduced and analyzed for integrated description of reuse in the process of software development. Specific features of reuse in software systems have been demonstrated, and factors that determine the reuse strategy have been identified. The corresponding expressions for costs, profits, effectiveness, and productivity of systems with reuse have been derived. Mesures of resource reusability and waste-free software have been introduced.

Information models of software productivity: Limits on productivity growth

This article reports research into generalized information-metric models of software process productivity to establish quantifiable behavior and theoretical bounds. The models establish a fundamental mathematical relationship between software productivity and the human capacity for information traffic, the software product yield (system size), information efficiency, and tool and process efficiencies. The article then derives an upper bound that quantifies average software productivity and the maximum rate at which it may grow. This bound reveals that, ultimately, when tools, methodologies, and automated assistants have reached their maximum effective state, further improvement in productivity can only be achieved through increasing software reuse. The reuse advantage is shown not to increase faster than logarithmically in the number of reusable features available. The reuse bound is further shown to be somewhat dependent on the reuse policy: a general “reuse everything” policy can lead to a somewhat slower productivity growth than a specialized reuse policy.

Wastewater Reuse Case Studies in the Middle East

Within the past few decades the accelerating demand on natural resources to provide water for urban use, and the associated cost of meeting that demand, has led to an increased interest in the reuse of waste waters for municipal, agricultural, industrial and groundwater recharge purposes. This paper reports upon the use made of effluent in some of the oil economies of the Middle East. It discusses the features of reuse in this particular context, the processes used and the standards adopted. Tabulated information and operational results are compared and the effect of reuse upon the local environment is commented upon.