Xem 1-20 trên 45 kết quả Material balances
  • Two of the main distinctions between chemical engineers and other engineering disciplines are the topics of mass and energy balances. Within these two topics there are a lot of underlying chemical principles that help chemical engineers to perform calculations to determine what is happening in a system, allowing better control of a process.

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  • The aim of this work is to provide an introduction into nanotechnology for the scientifically interested. However, such an enterprise requires a balance between comprehensibility and scientific accuracy. In case of doubt, preference is given to the latter. Much more than in microtechnology – whose fundamentals we assume to be known – a certain range of engineering and natural sciences are interwoven in nanotechnology.

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  • Target Score Second edition is a preparatory course for the new TOEIC® Test (Test of English for International Communication ®). Fully revised to meet the needs of the new TOEIC® Test, this Second edition also provides effective, classroom-friendly lessons for active, communicative English. Each of the twelve units focuses on one of the principal, recurrent themes of the TOEIC® Test, presenting contextualised language practice and covering the settings and situations that students find in TOEIC® Test questions.

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  • In this important new book and presents the quintessential guide for gas engineers, emphasizing the practical aspects of natural gas production. Readers will learn to incorporate cutting-edge research in estimating reserves, evaluating the performance of fractured wells, processing gas, and material balance analysis; learn to evaluate future performance of gas reservoirs; learn to improve the performance of gas wells; and more.

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  • Maintenance costs, as defined by normal plant accounting procedures, are normally a major portion of the total operating costs in most plants. Traditional maintenance costs (i.e., labor and material) in the United States have escalated at a tremendous rate over the past 10 years. In 1981, domestic plants spent more than $600 billion to maintain their critical plant systems. By 1991, the costs had increase to more than $800 billion, and they were projected to top $1.2 trillion by the year 2000.

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  • This publication deals primarily with small and medium-sized induction motors which are the most common type of alternating current motor. The combination of new materials and more sophisticated methods for calculation, design and production have made the modern three-phase induction motor a robust and reliable prime mover.

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  • The purpose of this book is to provide a straightforward but thorough introduction to accounting and finance for executives and managers who are studying these subjects, formally, for the first time. It is an entry-level text to be used before moving on to more advanced material. A high degree of practicality and relevance are introduced with a strong ‘real world’ flavour supported by examples from leading international companies. The glossary of terms is designed to be as comprehensive as possible so that readers can obtain clear guidance at a time when they most need it....

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  • When analyzing kinetic data or designing a chemical reactor, it is important to state clearly the definitions of reaction rate, conversion, yield, and selectivity. For a homogeneous reaction, the reaction rate is defined either as the amount of product formed or the amount of reactant consumed per unit volume of the gas or liquid phase per unit time. We generally use moles (g mol, kg mol, or lb mol) rather than mass to define the rate, since this simplifies the material balance calculations.

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  • The history of quality is the history of human efforts to make things perfect in an imperfect world. The main purpose of the quality procedures is to reduce errors and increase customer satisfaction. Errors and mistakes are part of human nature, but so is the ability to create solutions and find better alternatives. By using modern quality management tools we can shift the balance from errors towards solutions and better alternatives.

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  • Soil fertility is critical for the provision of adequate food, fiber and renewable natural resources(fuel,wood etc.). In the developing world soil fertility is linked to economic well being of many farm families. Poor soils means poor harvest leading to low returns for the over 60% of the population of developing countries relying on agriculture for survival.Use of inorganic and organic fertilizers in addition to biological processes to improve the fertility of the soil requires good understanding of their practical use and management.

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  • The book includes 17 chapters written by noted scientists and young researchers and dealing with various aspects of superconductivity, both theoretical and experimental. The authors tried to demonstrate their original vision and give an insight into the examined problems. A balance between theory and experiment was preserved at least from the formal viewpoint (9 and 8, respectively). The readers should be warned that many of the problems studied here are far from being solved and are treated on the basis of competing viewpoints.

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  • PLANT CELLS, UNLIKE ANIMAL CELLS, are surrounded by a relatively thin but mechanically strong cell wall. This wall consists of a complex mixture of polysaccharides and other polymers that are secreted by the cell and are assembled into an organized network linked together by both covalent and noncovalent bonds. Plant cell walls also contain structural proteins, enzymes, phenolic polymers, and other materials that modify the wall’s physical and chemical characteristics.

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  • Miller Subarc AC/DC power sources feature simple, easy to use balance controls on the main control panel and do not require a laptop PC interface to make complex waveform adjustments to operate.All prices are U.S. dollars and reflect Manufacturer's Suggested Retail Price (MSRP) for the U.S. market. Tax, delivery, and setup not included. Actual selling price determined by the Distributor. Prices are subject to change without notice. Additional items may be required for welding, such as shielding gas, consumables, and safety equipment...

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  • Because a sub-fund's assets and liabilities may be denominated in currencies different to the Base Currency, the sub-fund may be affected favourably or unfavourably by exchange control regulations or changes in the exchange rates between the Base Currency and other currencies. Changes in currency exchange rates may influence the value of a sub-fund's Shares, the dividends or interest earned and the gains and losses realised.

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  • Floods are part of nature. It is not technically feasible nor economically affordable to prevent all properties from flooding. Therefore a risk-based approach is taken to achieve the best results possible using the budget and resources available. As almost all of the Environment Agency’s funding has historically come from the taxpayer, we have a responsibility to ensure we achieve as much benefit as possible from the funds provided.

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  • The issue of sustainability has a number of dimensions, some of which were already mentioned. The one addressed here is the sustainability of subprojects. This issue comes up when the transition of social funds from the emer- gency or crisis mode to the longer term is examined. The transition is essentially the change from building a facility to delivering an ongoing service. By implication, how the services are being used needs to be monitored and evaluated, not just what was disbursed or built.

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  • In January 2009 WWF-UK launched its One Planet Food programme, which aims to reduce the environmental and social impacts of food consumption in the UK. We work across the food chain to reduce greenhouse gas emissions (GHGEs), protect biodiversity and reduce the impact of food on finite water resources. The aim has always been to move away from unsustainable food choices, towards sustainable ones that support global agriculture and biodiversity. Since 1960 the world’s population has doubled, increasing the demand for food and impacting on the climate and our ecosystems.

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  • The purpose of environmental-economic accounting is to supplement the conventional national accounts (UN SNA 2008) with tables which inform policymakers of environmental and natural resource availability, use, depletion and degradation.

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  • To be more effective, you have to weave together practical tech- niques, core “wisdom” concepts, and basic principles of project man- agement; integrate the “scientific,” technical side of project manage- ment with the interpersonal and intrapersonal behavioral skills that are the real keys to effective performance; and balance the right and left brain to become more effective.

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  • Yet most people responsible for furnishing a new home have no training in interior design. They may not be aware of interior de- sign guidelines and they are unlikely to have the tacit knowledge and experience required to optimally balance the tradeoffs. In- stead such amateur designers rely on intuitive rules such as pushing large furniture items against the walls. These intuitive rules often lead to functionally ineffective and visually imbalanced arrange- ments [Lyons 2008].

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