Xem 1-20 trên 52 kết quả Many particles
  • Particle swarm optimization (PSO) is a population based stochastic optimization technique influenced by the social behavior of bird flocking or fish schooling.PSO shares many similarities with evolutionary computation techniques such as Genetic Algorithms (GA). The system is initialized with a population of random solutions and searches for optima by updating generations.

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  • Dams and particle separation is important in the process of harvesting rice (rice; wheat) and energy intensive. There have been many studies on various parts of the dam to improve your drum beats combine harvesters were introduced in recent years. Research division beating drums beating two types of tangential to the direction tangential feed was made in 2007 with the aim of: increasing particle separation distribution of the dam, the dam reduced energy costs, reduce the impact split ...

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  • Recently, there is a growing interest in working with tree-structured data in different applications and domains such as computational biology and natural language processing. Moreover, many applications in computational linguistics require the computation of similarities over pair of syntactic or semantic trees. In this context, Tree Edit Distance (TED) has been widely used for many years. However, one of the main constraints of this method is to tune the cost of edit operations, which makes it difficult or sometimes very challenging in dealing with complex problems. ...

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  • Analysis and abatement of air pollution involve a variety of technical disciplines. Formation of the most prevalent pollutants occurs during the combustion process, a tightly coupled system involving fluid flow, mass and energy transport, and chemical kinetics. Its complexity is exemplified by the fact that, in many respects, the simplest hydrocarbon combustion, the methane-oxygen flame, has been quantitatively modeled only within the last several years.

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  • Motivated by the need of energy-efficiency improvements, process optimization, soft-start capability and numerous other environmental benefits, it may be desirable to operate induction motors for many applications at continuously adjustable speeds. The induction motor drives can provide high productivity with energy efficiency in different industrial applications and are the basis for modern automation. This book provides an account of this developing subject through such topics as modelling, noise, control techniques used for high-performance applications and diagnostics....

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  • With the amazing advances of scientific research, Hydrodynamics - Theory and Application presents the engineering applications of hydrodynamics from many countries around the world. A wide range of topics are covered in this book, including the theoretical, experimental, and numerical investigations on various subjects related to hydrodynamic problems. The book consists of twelve chapters, each of which is edited separately and deals with a specific topic. The book is intended to be a useful reference to the readers who are working in this field....

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  • Tham khảo sách 'intermediate physics for medicine and biology - fourth edition', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • From the Preface to the Third Edition, by Russell K. Hobbie: Between 1971 and 1973 I audited all the courses medical students take in their first two years at the University of Minnesota. I was amazed at the amount of physics I found in these courses and how little of it is discussed in the general physics course. I found a great discrepancy between the physics in some papers in the biological research literature and what I knew to be the level of understanding of most biology majors or premed students who have taken a year of physics....

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  • Pulp and paper is a mature industry. Industrialised paper manufacturing in Europe started in the early 19th century (Berkhout, 2005). It is a capital and resource-intensive industry that contributes to many environmental problems, including global warming, human tox- icity, eco-toxicity, photochemical oxidation, acidification, nutrification, and solid wastes (Blazejczak and Edler, 2000). Paper is made of natural fibres, either from wood or from recycled materials. Figure 1 below presents a schematic representation of the production system.

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  • The chemical properties of organics of health concern – hydrophobic and not water soluble - results in a low bioavailability to plants. Plant growth is dependent on the water solubility of nutrients and minerals and water is the transporting vector. Organics with a low water solubility will therefore not be taken up by plants. The presence of organic environmental pollutants, like dioxins and PCBs in agricultural crops is more the result of atmospheric deposition than direct absorption from contaminated soil.

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  • Air pollution is a leading environmental threat to the health of urban populations overall and specifically to New York City residents. Clean air laws and regulations have improved the air quality in New York and most other large cities, but several pollutants in the city’s air are at levels that are harmful. This report provides estimates of the toll of air pollution on the health of New Yorkers. It focuses on 2 common air pollutants—fine particulate matter (PM2.5) and ozone (O3).

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  • Okuyama et al. Nanoscale Research Letters 2011, 6:351 http://www.nanoscalereslett.com/content/6/1/351 NANO EXPRESS Open Access Magnetoluminescence from trion and biexciton in type-II quantum dot Rin Okuyama*, Mikio Eto and Hiroyuki Hyuga Abstract We theoretically investigate optical Aharonov-Bohm (AB) effects on trion and biexciton in the type-II semiconductor quantum dots, in which holes are localized near the center of the dot, and electrons are confined in a ring structure formed around the dot. Many-particle states are calculated numerically by the exact diagonalization method.

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  • The importance of particle characterization in both the research and development, and the manufacture and quality control of materials and products that we use in our everyday lives is, in some sense, invisible to those of us not directly involved with these activities. Few of us know how particle size, shape, or surface characteristics can influence, for example, the efficacy of a painreliever, or the efficiency of a catalytic converter, or the resolution of a printer.

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  • Semiconductor nanostructures are currently one of the largest and most exciting areas in solid state physics. Low-dimensional electron systems (realized in semiconductor quantum structures) are particularly appealing because they allow one to study many-particle effects in reduced dimensions. Inelastic light scattering gives direct access to the elementary excitations of those systems.

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  • The textbook written by Paul Davies in 19891 entitled, The New Physics, commenced with the following opinion. Many elderly scientists look back nostalgically at the first 30 years of the 20th century, and refer to it as the golden age of physics. Historians, however, may come to regard those years as the dawning of the New Physics. The events which the quantum and relativity theories set in train are only now impinging on science, and many physicists believe that the golden age was only the beginning of the revolution....

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  • In many high-pressure and high-temperature reactions, important information concerning the chemical and physical processes can be obtained through study of the reactions at the very early stages (the first few seconds to 2-3 minutes) before secondary reactions occur. However, this is not easy to do because the equipment required to carry out such reactions must be relatively massive to contain the sample at the high pressures and high temperatures.

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  • The idea for this book originated from the Joint Discussion 10 of the XXIV IAU General Assembly held in Manchester (England) in the summer of 2000. The extremely successful session on mergers in clusters of galaxies persuaded the publisher of this book to have a volume on such a topic. Clusters of galaxies are by now recognized to be not simple relaxed structures, but rather they are evolving via merging processes in a hierarchical fashion from poor groups to rich clusters.

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  • Similarly, while companies in New York and Ohio filed SARs through multiple entities, a single firm in each state filed the majority of SARs. This was also the case for Wisconsin, ranked fourth among filing locations. For that state, five separate insurance carriers, through one entity, generated 88 percent of filings for the twelve- month period. Unlike in Massachusetts, the Wisconsin-based firm was not affiliated with other companies in and/or from the state during the same time frame.

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  • In many developed nations, significant progress has been made in reducing direct discharges of pollutants into water bodies, primarily through increased treatment of industrial wastewater before it is discharged. An OECD report found that in member countries in the past several decades, “industrial discharges of heavy metals and persistent chemicals have been reduced by 70-to-90 percent or more in most cases” (OECD 2006).

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  • Who has design authority? Similar to requirements, some- one has to define the design of the work itself. The design is different from the requirements because there are always many different possible designs to fulfill a set of require- ments. Designs, also like requirements, are often negotiated between two or more parties. One person or team might be responsible for driving the design process and developing ideas (designer), and another team provides guidance and feedback on the first party’s work (VP).

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