موضوعات
آموزش و پرورش
ادبیات و زبان
پزشکی، دندانپزشکی و داروسازی
تاریخ و جغرافیا
داستان و رمان
دیگر
دین و فلسفه
روانشناسی
ریاضیات و آمار
سلامتی، تناسب اندام و رژیم غذایی
شیمی و پلیمر
علوم اجتماعی و حقوق
علوم زیستی و بیوتکنولوژی
فیزیک و نجوم
کامپیوتر و اینترنت
کتابهای کودکان و داستان
کسب و کار و اقتصاد
کشاورزی و دامپزشکی و غذا
معماری
مهندسی و فناوری
هنر و تئاتر
محصولات
ALICE'S ADVENTURES IN WONDERLAND - Original PDF
نویسندگان: خلاصه: Al-ice had sat on the bank by her sis-ter till she was tired. Once or twice she had looked at the book her sis-ter held in her hand, but there were no pict-ures in it, "and what is the use of a book," thought Alice, "with-out pict-ures?" She asked her-self as well as she could, for the hot day made her feel quite dull, if it would be worth while to get up and pick some dai-sies to make a chain. Just then a white rab-bit with pink eyes ran close by her. image That was not such a strange thing, nor did Alice think it so much out of the way to hear the Rab-bit say, "Oh dear! Oh, dear! I shall be late!" But when the Rab-bit took a watch out of its pock-et, and looked at it and then ran on, Al-ice start-ed to her feet, for she knew that was the first time she had seen a Rab-bit with a watch. She jumped up and ran to get a look at it, and was just in time to see it pop down a large rab-bit hole near the hedge. As fast as she could go, Al-ice went down the hole af-ter it, and did not once stop to think how in the world she was to get out. The hole went straight on for some way and then turned down with a sharp bend, so sharp that Al-ice had no time to think to stop till she found her-self fall- ing in what seemed a deep well. She must not have moved fast, or the well must have been quite deep, for it took her a long time to go down, and as she went she had time to look at the strange things she passed. First she tried to look down and make out what was there, but it was too dark to see; then she looked at the sides of the well and saw that they were piled with book-shelves; here and there she saw maps hung on pegs. She took down a jar from one of the shelves as she passed. On it was the word Jam, but there was no jam in it, so she put it back on one of the shelves as she fell past it.
Plasticity of Metals and Alloys - Original PDF
نویسندگان: خلاصه: In this title, the results of observations and investigations of a new phenomenon - changes in the macroscopic characteristics of the plastic deformation of metals and alloys at a superconducting transition - are systematised. In these works it is shown for the first time that the electronic drag of dislocations accompanying low-temperature deformation is effective. The main experimental features of the phenomenon - the dependences of the characteristics of the change in plasticity at a superconducting transition on the stress, deformation, temperature, deformation rate, and concentration of the alloying element in the superconductor - and results indicating a correlation between the characteristics of the effect and the superconducting properties are presented. Experiments clarifying the mechanisms of the phenomenon are analysed. A brief exposition of the theoretical investigations of the electronic drag of dislocations in metals in the normal and superconducting states and the influence of a superconducting transition on the plasticity is given. The theoretical results are compared with the experimental results. Examples of the application of the effect as a new method for investigating the physical mechanisms of low-temperature plastic deformation are presented. The applied aspects of the phenomenon are discussed separately.
High temperature strain of metals and alloys: physical fundamentals - Original PDF
نویسندگان: خلاصه: Creep and fatigue are the most prevalent causes of rupture in superalloys, which are important materials for industrial usage, e.g. in engines and turbine blades in aerospace or in energy producing industries. As temperature increases, atom mobility becomes appreciable, affecting a number of metal and alloy properties. It is thus vital to find new characterization methods that allow an understanding of the fundamental physics of creep in these materials as well as in pure metals. Here, the author shows how new in situ X-ray investigations and transmission electron microscope studies lead to novel explanations of high-temperature deformation and creep in pure metals, solid solutions and superalloys. This unique approach is the first to find unequivocal and quantitative expressions for the macroscopic deformation rate by means of three groups of parameters: substructural characteristics, physical material constants and external conditions. Creep strength of the studied up-to-date single crystal superalloys is greatly increased over conventional polycrystalline superalloys. From the contents: - Macroscopic characteristics of strain at high temperatures - Experimental equipment and technique of in situ X-ray investigations - Experimental data and structural parameters in deformed metals - Subboundaries as dislocation sources and obstacles - The physical mechanism of creep and the quantitative structural model - Simulation of the parameters evolution - System of differential equations - High-temperature deformation of industrial superalloys - Single crystals of superalloys - Effect of composition, orientation and temperature on properties - Creep of some refractory metals For materials scientists, solid state physicists, solid state chemists, researchers and practitioners from industry sectors including metallurgical, mechanical, chemical and structural engineers.
Phase Transformations of Elements Under High Pressure - Original PDF
نویسندگان: خلاصه: The study of transformations of materials under high pressures promises to yield modifications with important applications in materials science and other fields including, by way of example, the dense metallic modification of hydrogen possessing extremely high superconducting properties. This work presents recent theoretical and experimental information gathered on phase diagrams of 96 elements. Data is presented on first- and second-phase transitions, melting lines, crystal structures of the stable and metastable phases, important phase properties such as the Curie and Neel temperature, and the superconducting temperature. Information is provided on elements' liquid state, amorphization, and metallization. Temperature-pressure diagrams are given for most of the elements.
Nanocrystalline Aluminum Alloys - Original PDF
نویسندگان: خلاصه: In order for a material to be defined nanocrystalline the size of its grains must be of the order of less than 100 nm. Such materials can be constituted by one or more phases distributed in one, two, or three dimensions. Examples are nanowires, layers either deposited on top of a substrate as coatings or stacked in suitable sequences, and bulk objects. If the material is fully made of nanograins the number density of crystals scales with their size (e.g., it can range from 1025 to 1021 m−3 for sizes of 5 and 100 nm respectively).
Mossbauer analysis of the atomic and magnetic structure of alloys - Original PDF
نویسندگان: خلاصه: The monograph indicates the key problems that have to be solved for the further development of the Mossbauer methods for analysis of the nuclear and magnetic structure of alloys, and offer solution variants for some of these problems based on the generalised results of a wide range of theoretical and experimental investigations, including original work by the author of the book and his colleagues.
![Living with Darwin: Evolution, Design, and the Future of Faith (Philosophy in Action)[2009] - Original PDF](https://dl.libsan.ir/images/1/12/8_6468ecbbeb85c.jpg)
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