Xem 1-20 trên 987 kết quả The evolution
  • Introduction: The evolution of hydrogen gas at the cathode is one of the reactions most frequently occurring in industrial cells. Besides the obvious case of water electrolyzers, hydrogen evolution occurs at the cathode of chlor-alkali and chlorate cells, which are among the most intensive electrochemical processes. On the other hand, hydrogen liberation is the cathodic process in cells containing aqueous solutions or protonated solvents where the wanted reaction takes place at the anode.

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  • Before entering upon the subject-matter of these new memoirs, I must explain an hypothesis which will undoubtedly seem strange, but in the absence of which it is impossible for me to proceed intelligibly: I mean the hypothesis of a God. To suppose God, it will be said, is to deny him. Why do you not affirm him? Is it my fault if belief in Divinity has become a suspected opinion; if the bare suspicion of a Supreme Being is already noted as evidence of a weak mind; and if, of all philosophical Utopias, this is the only one which the world no...

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  • Before entering upon the subject-matter of these new memoirs, I must explain an hypothesis which will undoubtedly seem strange, but in the absence of which it is impossible for me to proceed intelligibly: I mean the hypothesis of a God. To suppose God, it will be said, is to deny him. Why do you not affirm him? Is it my fault if belief in Divinity has become a suspected opinion; if the bare suspicion of a Supreme Being is already noted as evidence of a weak mind; and if, of all philosophical Utopias, this is the only one which...

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  • In this chapter, you should be able to: Explain why the majority of point mutations are harmless; explain how sexual recombination generates genetic variability; define the terms population, species, gene pool, relative fitness, and neutral variation; list the five conditions of Hardy-Weinberg equilibrium;...

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  • The Evolution of Bridges in the United States 67.1 67.2 67.3 Introduction Early U.S. Bridges The Canal Era Turnpikes • Timber Bridges • Covered Timber Bridges • Iron Bridges 67 67.4 The Railroad Era Trusses • Railroad Trestles • Steel Arch Bridges • Kit Bridges 67.5 The Motor Car Era Steel Truss Bridges • Reinforced Concrete • Concrete Arches • Concrete Girders • Canticrete • Suspension Bridges • Movable Bridges • Floating Bridge 67.

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  • THE EVOLUTION OF CIRCUIT SWITCHING The current circuit switched network concept has remained essentially unchanged from the original electromechanical Strowger exchange (see the Preface for an explanation of how this exchange came by its name). At its most basic level the telephone network comprises transmission paths and switching nodes. The design of a circuit switch is based on the ability to physically create a path (circuit) from one network element to another and to hold this path open for the duration of the interaction (call)....

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  • CHAPTER SEVENTEEN Ecologic Evolution of Cambrian Trilobites Skeletonized Cambrian trilobites are both varied and abundant and provide potential proxies for understanding the evolution of nonskeletonized arthropod groups. Soft- and hard-part morphology suggests that Cambrian Trilobita.

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  • These lectures intend to give a self-contained exposure of some techniques for computing the evolution of plane curves. The motions of interest are the so-called motions by curvature. They mean that, at any instant, each point of the curve moves with a normal velocity equal to a function of the curvature at this point. This kind of evolution is of some interest in differential geometry, for instance in the problem of minimal surfaces.

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  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học tạp chí Department of Mathematic dành cho các bạn yêu thích môn toán học đề tài: The evolution of uniform random planar graphs...

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  • "Ah, well," an American visitor is said to have soliloquized on the site of the battle of Hastings, "it is but a little island, and it has often been conquered." We have in these few pages to trace the evolution of a great empire, which has often conquered others, out of the little island which was often conquered itself.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: The evolution of methods for the capture of human movement leading to markerless motion capture for biomechanical applications

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  • Soon after the first sequences of proteins and nucleic acids became available for comparative analysis, it became apparent that they can play a key role for reconstructing the evolution of life. The availability of the sequence of several proteins prompted the birth of the field of molecular evolution, which aims at both the reconstruction of the biochemical history of life and the understanding of the mechanisms of evolution at the molecular level through the analysis of the macromolecules of existing organisms.

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  • The security world is constantly changing, both in the context in which it has to operate, and in terms of what it can offer as a response to a wide range of threats. This is true across the world. Indeed, globalization and the impact of technology are just two trends that have seen to that. As a consequence, security has become more complicated; or, at least, the breadth of knowledge that a good security operative, at any level, needs to draw upon has been stretched

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  • Understanding the origins of humanity has long been one of our foremost intellectual pursuits, and one that greatly interests the general public as evidenced by museum attendance and by numerous media productions and general interest publications. Progress toward an improved understanding of our heritage is a continuing challenge for the scientific community, requiring advances in a range of disciplines that include archaeology, anthropology, geology, biology, oceanography, and genetics, and particularly research advances in areas where two or more of these fields intersect.

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  • Th ere is something about being human that instills in us a sense of wonder. When we stop to think about it, the very idea of life seems such a mystery. Where did we come from? How did life begin? When we look at the sky, we wonder about the vastness of the universe and whether other life may exist there. If we look through a microscope at a drop of pond water, we are amazed at the variety of tiny creatures we see. Since cells form the very basis of life, it is only natural that our sense of wonder extends to the cell. Where did...

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  • "International Business - Chapter 7: The international monetary system and the balance of payments" discuss the role of the international monetary system in promoting international trade and investment, explain the evolution and functioning of the gold standard, explain the evolution of the flexible exchange rate system

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Comparative embryology without a microscope: using genomic approaches to understand the evolution of development...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: What determines the evolution of early undifferentiated arthritis and rheumatoid arthritis? An update from the Norfolk Arthritis Register...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Minireview cung cấp cho các bạn kiến thức về ngành y đề tài: New genes in the evolution of the neural crest differentiation program...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Minireview cung cấp cho các bạn kiến thức về ngành y đề tài: The role of RNA folding free energy in the evolution of the polymerase genes of the influenza A virus...

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