Xem 1-20 trên 1662 kết quả Conduction
  • Since the establishment of the conductive properties of intrinsic conductive polymers, a huge variety of basic and applied research has been carried out, involving different polymers, copolymers, blends, mixtures and composites. Thus, fundamental understanding of physical and chemical properties of these materials has been sought, while the applied aspects have advanced very rapidly, crossing the boundaries between disciplines. Today, the applications of conducting polymers in various fields such as neuroscience, nanotechnology and green chemistry, are easily found.

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  • Hydraulic conductivity is the most important property of geological formations as the flow of fluids and movement of solutes depend on it. Among fluids, water and contaminant migration beneath, the ground surface have become critical for water resource development, agriculture, site restoration and waste disposal strategies.

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  • This book provides the state of the art of the investigation and the in-depth analysis of hydraulic conductivity from the theoretical to semi-empirical models perspective as well as policy development associated with management of land resources emanating from drainage-problem soils. A group of international experts contributed to the development of this book. It is envisaged that this thought provoking book will excite and appeal to academics, engineers, researchers and University students who seek to explore the breadth and in-depth knowledge about hydraulic conductivity....

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  • We show that the Dirichlet to Neumann map for the equation ∇·σ∇u = 0 in a two-dimensional domain uniquely determines the bounded measurable conductivity σ. This gives a positive answer to a question of A. P. Calder´n o from 1980. Earlier the result has been shown only for conductivities that are sufficiently smooth. In higher dimensions the problem remains open. Contents Introduction and outline of the method

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  • We present the percolation-theory model for explanation of conductivity of perovskites based on the scaling property of grain boundary formation. Assuming a two-layer simple effective medium model, composed of the grain itself as a first layer and the boundary as a second layer, it was modeled that the net resistivity r of the medium depends on the average grain size L, boundary thickness L’ and boundary fractal dimension D.

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  • In this paper, the rada absorption characteristics of conducting polymer nanocomposite were investigated. The complex permittivity and Rada attenuation values of nanocomposite were obtained using a network analyzer in the frequency ranges from 50 MHz to 50 GHz. Reflection loss strongly depends on thickness and complex permitivity and volume faction of conducting polymer of materials.

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  • Effect of wollastonite nanofibers on the improvement of thermal conductivity coefficient of Medium-Density Fiberboard (MDF) was studied here to find a possible solution to decrease hot-press time as a bottle-neck during composite production. Nanowollastonite was applied at 10%, based on the dry weight of wood fibers. Density of the control MDF boards was 0.66 g/cm3. Thermal conductivity coefficient was measured using an apparatus based on Fourier’s Law for heat conduction.

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  • The author suggested 8 basic methods for managing high school students' conduct evaluation, experimented method 1, and tested the necessity and feasibility of all the methods. All methods have been proved to be necessary and feasible.

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  • Bài giảng Conductivity sau đây cung cấp cho các bạn những kiến thức về độ dẫn điện, lý thuyết đo độ dẫn điện, độ dẫn điện vs. TDS, kỹ thuật đo độ dẫn điện. Đây là tài liệu hữu ích dành cho các bạn chuyên ngành Điện - Điện tử và những ngành có liên quan.

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  • Chapter 2 - Understanding the research process. The following will be discussed in this chapter: Stages of the scientific method, steps in conducting research, the research question, types of research questions, descriptive question,...

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  • If we connect a battery across a body, there is a movement of free electrons towards the positive end. This movement of electrons is an electric current. All materials can be classified into three groups according to how readily they permit an electric current to flow. These are: conductors, insulators, and semiconductors. In the first category are substances which provide an easy path for an electric current. All metals are conductors, however some metals do not conduct well. Manganin, for example, is a poor conductor. Copper is a good conductor, therefore it is widely used for cables.

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  • When preparing to conduct a site survey for a Cisco wireless LAN (WLAN) installation, follow the Cisco network design methodology. Cisco’s Prepare, Plan, Design, Implement, Operate and Optimize (PPDIOO) addresses the network in a phased approach. This white paper provides a “how to” overview that can be used when conducting a site survey and installation for a Cisco WLAN. In doing so, the Prepare, Plan, Design and Implement phases should be followed.

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  • Materials are important to mankind because of the benefits that can be derived from the manipulation of their properties, for example electrical conductivity, dielectric constant, magnetization, optical transmittance, strength and toughness. Materials science is a broad field and can be considered to be an interdisciplinary area. Included within it are the studies of the structure and properties of any material, the creation of new types of materials, and the manipulation of a material's properties to suit the needs of a specific application....

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  • Worked examples are a necessary element to any textbook in the sciences, because they reinforce the theory (i.e. the principles, concepts and methods). Once the theory has been understood, well chosen examples can be used, with modification, as a template to solve more complex, or similar problems. This work book contains examples and full solutions to go with the text of our e-book (Heat Transfer, by Long and Sayma). The subject matter corresponds to the five chapters of our book: Introduction to Heat Transfer, Conduction, Convection, Heat Exchangers and Radiation....

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  • Electrochemistry, long-time corner stone for fundamental chemistry and physics, now plays an important role in many areas of applied science and technology. A very broad range of applications of electrochemical principles and technologies is found in materials science. Electrochemical deposition of metals and alloys, formation of oxide films and semi-conductors, corrosion and corrosion protection, new polymer materials that can switch between metallic conductivity and semi-conducting properties, and new applications in fast-evolving nanotechnologies are just some of the examples....

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  • The convection and conduction heat transfer, thermal conductivity, and phase transformations are significant issues in a design of wide range of industrial processes and devices. This book includes 18 advanced and revised contributions, and it covers mainly (1) heat convection, (2) heat conduction, and (3) heat transfer analysis.

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  • This book is intended as a revision aid for students studying degree or diploma courses in law and practical legal training. As space is limited, the book only covers the broad topic areas referred to in the ‘Priestley 11’ prescription for ‘Professional Conduct’, with the exception of trust accounting (which is covered in the companion Cavendish text Essential Professional Conduct: Legal Accounting, 2001, by Bronwyn Olliffe).

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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: Conductive-probe atomic force microscopy characterization of silicon nanowire

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  • In Ideas into Words, Elise Hancock, a professional writer and editor with thirty years of experience, provides both novice and seasoned science writers with the practical advice and canny insights they need to take their craft to the next level. Rich with real-life examples and anecdotes, this book covers the essentials of science writing: finding story ideas, learning the science, opening and shaping a piece, polishing drafts, overcoming blocks, and conducting interviews with scientists and other experts who may not be accustomed to making their ideas understandable to lay readers....

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  • Tham khảo sách 'the road to results designing and conducting effective development evaluations', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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