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Dl4All - Download free For All: software and educational resource.Free software and educational resource. With a little searching, you can download what you need for free without spending any money. Our site - "Dl4All" offers free software downloads including antivirus software, office suites and video editing software. Here you can find software reviews and ratings so you can understand which apps are worth downloading. If you're looking for free educational programs or materials in the US and Canada, we'll help you find what you need for students and learners.  Geometrical Optics: Lectures in Optics, Volume 2 English | 2020 | ISBN: 9781510619463 | 472 Pages | PDF | 58 MB This second volume of the series Lectures in Optics develops a thorough presentation of geometrical optics effects. The book begins by discussing refraction and reflection off single surfaces, both flat and spherical. Presented next are the essential building elements, optical power and beam vergence, which are paramount in imaging because the incident vergence is added to the element's power to produce the vergence leaving the optical element. Imaging definitions and formulation are covered next, followed by the power configurations and imaging arrangements possible with a single element, a single lens, and a mirror for real and virtual objects. Next, two more parameters are introduced: the extent of an element along the optical axis (thick lenses and lens systems) and the extent of an element perpendicular to the optical axis (stops and pupils). The way image quality is affected by the transverse restriction of light is then discussed, including resolution and image blur. Finally, the book introduces the concepts of optical aberrations as a consequence of a violation of the paraxial approximations. This book is suitable for all Geometrical Optics courses at college, graduate school, or professional school levels, such as physics, engineering, visual science, or optometry programs. Comprehensive practice examples, exercises, and quizzes throughout the chapters reinforce an understanding of the covered material.  Gardening in the Shade in South Africa by Allan Haschick English | ISBN: 9781432310202 | ASIN : B08Q4GY61K | 532 pages | EPUB | January 1, 2021 | 183 Mb Most gardens have shady spots, but some gardens have a real shade 'problem'. Whether it is caused by large or overhanging trees, tall buildings, or just being on the 'wrong side of the street', finding the best plants for a shady area can be challenging, particularly if the rest of your garden basks in sunshine all year round. Shade plants are not necessarily tropical, although many tropical plants thrive in shade. Some delicate leafy plants will scorch and burn in hot sun, some plants like shady conditions but not damp soil, while others grow happily in damp, boggy ground that receives minimum sunlight. Gardening in the Shade examines the different types of shade and the effect it has on plant growth. It presents solutions to common problems such as feeding, watering and mulching shade plants, and how to deal with exacerbating factors such as wind, frost and soil type. Popular shade plants, like clivias, bromeliads, fuchsias and ferns are given special features, and a directory of species lists plants under headings like ground covers, tropical-looking perennials, and succulents.  Future Rising: A Journey from the Past to the Edge of Tomorrow (Future of Humanity, Social Aspects of Technology) (Analyzing the Future) by Andrew D. Maynard English | Oct 27, 2020 | ISBN: 1642502634 | 220 pages | PDF + EPUB | 1 + 2 MB A Compelling Vision of the Future  Fundamentals of Modern Unsteady Aerodynamics, Third Edition by Ülgen Gülçat English | PDF | 2021 | 445 Pages | ISBN : 3030607763 | 11.4 MB This book introduces the concept of unsteady aerodynamics and its underlying principles. The author provides the readers with a comprehensive review of the fundamental physics of free and forced unsteadiness, the terminology and basic equations of aerodynamics ranging from incompressible flow to hypersonics.  Fulfilling Ageing: Psychosocial and Communicative Perspectives on Ageing by Marisa Cordella English | PDF | 2021 | 1008 Pages | ISBN : 3030600696 | 17.6 MB This book explores the reality of ageing and old age from the perspectives of the individual and society. It emphasizes cross-cultural aspects of ageing and communication issues both within and across generations.  Frugal Living Hacks: 3 Manuscripts: Your Complete Guide To Saving Money And Simplifying Your Life (Cutting Back, How To Downsize Your Life, Declutter Your Space) by Kathy Stanton English | January 9, 2019 | ISBN: 1793456836 | 95 pages | Rar (PDF, AZW3) | 1.18 Mb 3 BOOK BUNDLE!Book 1: Living With Less And Loving It: 50 Helpful Steps To Downsize Your Life, Enjoy Life On A Budget And Find Happiness  From Equity Talk to Equity Walk: Expanding Practitioner Knowledge for Racial Justice in Higher Education by Tia Brown McNair, Estela Mara Bensimon, Lindsey Malcom-Piqueux English | January 22nd, 2020 | ISBN: 1119237912 | 160 pages | True EPUB | 0.93 MB A practical guide for achieving equitable outcomes  Frank Lloyd Wright's Fallingwater: American Architecture in the Depression Era by Catherine W Zipf English | ISBN: 113864434X, 1138644358 | 204 pages | EPUB | December 31, 2020 | 6.72 Mb Frank Lloyd Wright's Fallingwater explores the relationship between the economic tumult in the United States in the 1930s, Frank Lloyd Wright, and the construction of his most famous house, Fallingwater.  France Travel Guide: Tips, places, best prices. All what I got from France. Tips, places, best prices by Brendan Rivera English | March 12, 2020 | ISBN: N/A | ASIN: B085RP5KR5 | 28 pages | Rar (PDF, AZW3) | 2.27 Mb Widely known as the cultural capital of the world, France boasts a excellent array of food, scenery, and history  Fractals and Chaos in Geology and Geophysics, 2 edition by Donald L. Turcotte English | July 13, 1997 | ISBN-10: 0521567335 | 416 pages | PDF | 47.2 Mb Now in a greatly expanded second edition, this book relates fractals and chaos to a variety of geological and geophysical applications and introduces the fundamental concepts of fractal geometry and chaotic dynamics. In this new edition, Turcotte expands coverage of self-organized criticality and includes statistics and time series to provide a broad background for the reader. If you are looking for educational materials, our website offers free downloadable online courses. 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