Physics category

Methods in agricultural chemical analysis: a practical handbook

This reference manual contains information on the most suitable procedures for the analysis of agricultural materials. It describes the analysis of soils and composts, plant materials, feeds, plant components (e.g. cellulose, lignin, trace elements), fertilizers, and biological substances. The book is designed as a laboratory sourcebook, complete with useful Internet addresses, and contains over 60 different practical methods. Each method is described by a step-by-step approach, and contains details of apparatus required, chemical reaction equations, formulae and calculations, and meticulous descriptions of experimental results. Most methods use standard equipment and instruments commonly found in the practical lab. The aim is that scientists with little experience in analytical techniques should be able to safely carry out these procedures and obtain acceptable results. It is essential reading for anyone who carries out agricultural or environmental research.

published on 07-11-2019 - 17 views

I have examined maps of the city with the greatest care, yet have never again found the Rue d'Auseil. These maps have not been modern maps alone, for I know that names change. I have, on the contrary, delved deeply into all the antiquities of the place, and have personally explored every region, of whatever name, which could possibly answer to the street I knew as the Rue d'Auseil. But despite all I have done, it remains an humiliating fact that I cannot find the house, the street, or even the locality, where, during the last months of my impoverished life as a student of metaphysics at the university, I heard the music of Erich Zann.

published on 06-11-2019 - 23 views
The Problems of Philosophy

IN the following pages I have confined myself in the main to those problems of philosophy in regard to which I thought it possible to say something positive and constructive, since merely negative criticism seemed out of place. For this reason, theory of knowledge occupies a larger space than metaphysics in the present volume, and some topics much discussed by philosophers are treated very briefly, if at all.

published on 30-10-2019 - 42 views
Rapid Game Development Using Cocos2d-JS: An end-to-end guide to 2D game development using JavaScript

Get a gentle introduction to the Cocos2d-JS framework to begin working with sprite manipulations, animations, and other 2d game development topics. This book covers environment setup and getting started with a framework that works seamlessly across all browsers. Rapid Game Development Using Cocos2d-JS teaches you the overall architecture of Cocos2d-JS and explains the internal working of the framework. What You'll Learn Get a simple head start in Cocos2d-JS Gain an architectural overview of the different blocks of the framework Master sprites, spritesheets, and frame animation Work with the event system in Cocos2d-JS Discover the animation APIs in Cocos2d-JS Leverage the built-in physics engine

published on 30-10-2019 - 65 views
Introduction to Complex Numbers

The study of functions of Complex Variables is a very important part of modern mathematics, as well both basic and applied physics. At university you are introduced to some important applications of Complex Numbers beginning in your first year when studying periodic motion. In the second and subsequent years an understanding of Complex Numbers becomes important in classical and quantum mechanics, as well as in applied physics. I very much doubt you can avoid Complex Numbers past your second year at university.

published on 26-10-2019 - 71 views
The Mathematical Physics of the Nineteenth Century

BRITISH ASSOCIATION. THE losses sustained by mathematical science in the past twelve months have perhaps not been so numerous as in some years, but they include at least one name of world-wide import. Those of us who were students of mathematics thirty or forty years ago will recall the delight which we felt in reading the geometrical treatises of George Salmon, and the brilliant contrast which they exhibited with most of the current text-books of that time. It was from him that many of us first learned that a great mathematical theory does not consist of a series of detached propositions carefully labeled and arranged like specimens on the shelves of a museum, but that it forms an organic whole, instinct with life, and with unlimited possibilities of future development. As systematic expositions of the actual state of the science, in which enthusiasm for what is new is tempered by a due respect for what is old, and in which new and old are brought into harmonious relation with each other, these treatises stand almost unrivaled. Whether in the originals, or in the guise of translations, they are accounted as classics in every university of the world. So far as British universities are concerned, they have formed the starting point of a whole series of works conceived in a similar spirit, though naturally not always crowned by the same success. The necessity for this kind of work grows, indeed, continually; the modern fragmentary fashion of original publication and the numerous channels through which it takes place make it difficult for any one to become initiated into a new scientific theory unless he takes it up at the very beginning and follows it diligently throughout its course, backwards and forwards, over rough ground and smooth. The classical style of memoir, after the manner of Lagrange, or Poisson, or Gauss, complete in itself and deliberately composed like a work of art, is continually becoming rarer. It is therefore more and more essential that from time to time some one should come forward to sort out and arrange the accumulated material, rejecting what has proved unimportant, and welding the rest into a connected system. There is perhaps a tendency to assume that such work is of secondary importance, and can be safely left to subordinate hands. But in reality it makes severe demands on even the highest powers; and when these have been available the result has often done more for the progress of science than the composition of a dozen monographs on isolated points. For proof one need only point to the treatises of Salmon himself, or recall (in another field) the debt which we owe to such books as the 'Treatise on Natural Philosophy' and the 'Theory of Sound,' whose authors are happily with us.

published on 23-10-2019 - 96 views
Physics in the Quran

This Book author proof existence of God in scientific basis in a logical way.He only use Quran as a tool to prove existence of God

published on 22-10-2019 - 210 views
The Problems of Philosophy

Bertrand Russell attempts to create a brief and accessible guide to the problems of philosophy. Focusing on problems he believes will provoke positive and constructive discussion, Russell concentrates on knowledge rather than metaphysics. A lively and still one of the best introductions to philosophy, this book pays off both a closer reading for students and specialists, and a casual reading for the general public.

published on 19-10-2019 - 73 views
The Man Who Came Early

Poul William Anderson (November 25, 1926–July 31, 2001) was an American science fiction author who wrote during a Golden Age of the genre. Poul Anderson also authored several works of fantasy. He received a degree in physics from the University of Minnesota in 1948. He married the former Karen Kruse in 1953. They had one daughter, Astrid, who is married to the science fiction author Greg Bear. He was the sixth President of Science Fiction and Fantasy Writers of America, taking office in 1972. He was also a member of the Swordsmen and Sorcerers' Guild of America, a loose-knit group of Heroic Fantasy authors founded in the 1960s, some of whose works were anthologized in Lin Carter's Flashing Swords! anthologies. In addition, he was a founding member of the Society for Creative Anachronism. He died of cancer on July 31, 2001, after a month in the hospital. Source: Wikipedia

published on 18-10-2019 - 56 views
Public Health Risks of Disasters: Communication, Infrastructure, and Preparedness: Workshop Summary

a book talking about Public Health Risks of Disasters: Communication, Infrastructure, and Preparedness: Workshop Summary

published on 13-10-2019 - 83 views
Modelling Local Gravity Anomalies from Processed Observed Gravity Measurements for Geodetic Applicat

As the application of gravity data in applied sciences such as geodesy, geodynamics, astronomy, physics and geophysics for earth shape determination, geoid model determination, computation of terrestrial mass displacement, orbit computation of natural and artificial celestial bodies, realization of force standards and derived quantities and density distribution in the different layers in the upper crust and having considered the cost of direct gravity survey, the study presents modelling local gravity anomalies from processed observed gravity measurements for geodetic application in Benin City. A total of 22 points were used. The points were respectively observed with CHC900 dual frequency GNSS receivers and SCINTREX CG-5 Autograv to obtain their coordinates and absolute gravity values. The theoretical gravity values of the points were computed on the Clarke 1880 ellipsoid to obtain their local gravity anomalies. The free air and the Bouguer corrections were applied to the computed gravity anomalies to obtain the free air and the Bouguer gravity anomalies of the points. Least squares adjustment technique was applied to obtain the model variables coefficient/parameters, as well as to fit the fifth-degree polynomial interpolation surface to the computed free air and the Bouguer gravity anomalies. Kriging method was applied using Surfer 12 software to plot the computed and the models' free air and Bouguer gravity anomalies. Microsoft Excel programs were developed for the application of the models in the study area. The Root Mean Square Errors (RMSEs) and the standard errors of the two models were computed to obtain the dependability, as well as reliability of the models. It is recommended that whenever either free air or Bouguer gravity anomalies of points within Benin City are to be obtained for application in applied sciences, the determined models should be applied.

published on 12-10-2019 - 101 views
The Problems of Philosophy

The Problems of Philosophy is a 1912 book by Bertrand Russell, in which the author attempts to create a brief and accessible guide to the problems of philosophy. Focusing on problems he believes will provoke positive and constructive discussion, Russell concentrates on knowledge rather than metaphysics: If it is uncertain that external objects exist, how can we then have knowledge of them but by probability. There is no reason to doubt the existence of external objects simply because of sense data. Russell guides the reader through his famous 1910 distinction between knowledge by acquaintance and knowledge by description and introduces important theories of Plato, Aristotle, René Descartes, David Hume, John Locke, Immanuel Kant, Georg Wilhelm Friedrich Hegel and others to lay the foundation for philosophical inquiry by general readers and scholars alike.

published on 09-10-2019 - 87 views
2-BAC تمارين حول نهايات محلولة

2-BAC تمارين حول نهايات محلولة :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

published on 04-10-2019 - 182 views

COURS 1 -ROTATION D'UN SOLIDE AUTOUR D'UN AXE FIXE ................................................................................................

published on 04-10-2019 - 160 views
تفاعلات أكسدة اختزال ثانية باكلوريا

تفاعلات أكسدة اختزال ثانية باكلوريا ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

published on 04-10-2019 - 182 views
تمارين المواد و الاجسام الذرة و الايون

تمارين الاجسام والمواد سلسلة الذرات والايونات تمارين الاجسام والمواد سلسلة الذرات والايونات أكسدة أكسدة الفلزات

published on 04-10-2019 - 161 views
Astrology Principles and Practices

Get All The Support And Guidance You Need To Be A Success With Astrology. This Book Is One Of The Most Valuable Resources In The World When It Comes To A Look at Principles and Practices.Keep reading to get the help you need. Is the fact that you would like to understand astrology

published on 29-09-2019 - 93 views
Light/Lines The First Twenty-Five Years PDF

This large volume had its unpretentious start in 1962, when Professor Donald Tully Elkins of Speed Scientific School, a researcher into the paranormal, found Walt Rogers’ Brown Notebook and decided to produce an experiment in creating extraterrestrial communications. Elkins had been researching in the area of UFO contactees for seven years when he found Rogers’ little notebook of recorded extraterrestrial messages allegedly received from a group called The Confederation of Planets in the Service of the Infinite Creator. When he read the simple directions for creating more of these contactee messages, he felt that it was an experiment worth doing. He selected a dozen of his best engineering and physics students and asked them to join in the experiment. I, a friend of one of these students, and a 19-year-old college student “across the street” at the College of Arts and Sciences of the University of Louisville, asked if I could join the group.

published on 14-09-2019 - 122 views
سلسلة الموجات المكانيكية المتوالية

تمارين الموجات المكانيكية المتوالية

published on 14-09-2019 - 182 views
Analog Circuit Design: Designing Dynamic Circuit Response

This second volume, Analog Circuit Design: Designing Dynamic Circuit Response, builds upon the first volume (Analog Circuit Design: Designing Amplifier Circuits) by extending coverage to include reactances and their time- and frequency-related behavioral consequences. Retaining a design-oriented analysis, this volume begins with circuit fundamentals involving capacitance and inductance and lays down the approach using s-domain analysis. Additional concepts and perspectives fill in the blanks left by textbooks in regards to circuit design. It simplifies dynamic circuit analysis by using the graphical methods of reactance plots. Methods of compensating amplifiers, including feedback amplifiers, are kept as simple as possible using reactance plots and s-domain transfer functions that mainly require algebraic skill.

published on 11-09-2019 - 146 views
Fundamentals of Digital Electronics

Fundamentals of Digital Electronics ebook

published on 11-09-2019 - 121 views
درس التجادب الكوني جدع مشترك

التجاذب الكوني جدع مشترك علمي

published on 11-09-2019 - 257 views
Poetry of Physics and the Physics of Poetry

Poetry of Physics and the Physics of Poetry

published on 11-09-2019 - 111 views
Applied materials science: applications of engineering materials in structural, electronics, thermal

Applied materials science: applications of engineering materials in structural, electronics, thermal, and other industries

published on 10-09-2019 - 148 views
Fundamentals of quantum mechanics: for solid state electronics and optics

Quantum mechanics has evolved from a subject of study in pure physics to one with a vast range of applications in many diverse fields. Some of its most important applications are in modern solid state electronics and optics. As such, it is now a part of the required undergraduate curriculum of more and more electrical engineering, materials science, and applied physics schools. This book is based on the lecture notes that I have developed over the years teaching introductory quantum mechanics to students at the senior/first year graduate school level whose interest is primarily in applications in solid state electronics and modern optics.

published on 10-09-2019 - 160 views
The Fields of Electronics: Understanding Electronics Using Basic Physics

This book provides a new way to understand the subject of electronics. The central theme is that all electrical phenomena can be explained in terms of electric and magnetic fields. Beginning students place their faith in their early instruction. They assume that the way they have been educated is the best way. Any departure from this format just adds complications. This book is a departure—hopefully, one that helps. There are many engineers and scientists struggling to function in the real world. Their education did not prepare them for handling most of the practical problems they encounter. The practitioner in trouble with grounds, noise, and interference feels that something is missing in his education. The new engineer has a very difficult time ordering, specifying, or using hardware correctly. Facilities and power distribution are a mystery. Surprisingly, all these areas are accessible once the correct viewpoint is taken. This book has been written to provide a better introduction to the field of electronics so that the parts that are often omitted can be put into perspective. The book uses very little mathematics. It helps to have some background in electronics, but it is not necessary. The beginning student may need some help from an instructor to fill in some of the blanks. The practicing engineer will be able to read this book with ease.

published on 10-09-2019 - 145 views
1-BAC تمارين القياس في الكمياء

أهمية القياس في الكمياء

published on 10-09-2019 - 194 views
أهمية القياس في الكمياء الأولى باكلوريا

درس أهمية القياس في الكيمياء

published on 10-09-2019 - 204 views