Scientific American Brazil - Junho 2016

Scientific American Brazil – Junho 2016
Portuguese | 100 pages | True PDF | 22 MB

Accuracy and Reliability in Scientific Computing (Repost)

Accuracy and Reliability in Scientific Computing By Bo Einarsson
2005 | 363 Pages | ISBN: 0898715849 | PDF | 19 MB

Developing accurate and reliable scientific software is notoriously difficult. This book investigates some of the difficulties related to scientific computing and provides insight into how to overcome them and obtain dependable results. The text deals thoroughly with the problems that affect software in general as well as the particular challenges of numerical computation: approximations occurring at all levels, continuous functions replaced by discretized versions, infinite processes replaced by finite ones, and real numbers replaced by finite precision numbers. Divided into three parts, it starts by illustrating some of the difficulties in producing robust and reliable scientific software. The second section describes diagnostic tools that can be used to assess the accuracy and reliability of existing scientific applications. In the last section, the authors describe a variety of techniques that can be employed to improve the accuracy and reliability of newly developed scientific applications.

Scientific American - Brasil - Edição 168 - Maio de 2016

Scientific American – Brasil – Edição 168 – Maio de 2016

Portuguese | Pages: 52 | PDF | 33.5 mb

* Cérebro afiado. Produção de ferramentas de pedra na
pré-historia moldou a inteligência da espécie humana. No Mirror, please.

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Into the Heart of Our World: A Journey to the Center of the Earth: A Remarkable Voyage of Scientific Discovery

David Whitehouse, “Into the Heart of Our World: A Journey to the Center of the Earth: A Remarkable Voyage of Scientific Discovery”

ISBN: 1605989592 | 2016 | EPUB | 288 pages | 4 MB

An enthralling and extraordinary adventure vividly charting the mysteries of the deep Earth, the history of our planet, and the latest discoveries about its inner core.

The journey to the center of the earth is a voyage like no other we can imagine. Over 3000 km below the earth’s surface, an extraordinary inner world the size of Mars awaits us. Dive through the molten iron of the outer core and eventually you will reach a solid sphere —an iron-clad world held within a metal sea and unattached to anything above. At the earth’s core is the history of our planet written in temperature and pressure, crystals and minerals …

Our planet appears tranquil from outer space. And yet the arcs of volcanoes, the earthquake zones, and the auroral glow rippling above our heads are testimony to the remarkable happenings within the earth’s core. For thousands of years these phenomena were explained in legend and myth. Only in recent times has the brave new science of seismology emerged. One hundred and fifty years after the extraordinary, imaginative feat of Jules Verne’s Journey to the Center of the Earth, David Whitehouse embarks on a voyage of scientific discovery into the heart of our world.

Seismologists today reveal a planet astonishingly buried within a planet. We watch as supercomputers convert signals from the ground into three-dimensional scans of subterranean continents. We will visit laboratories where scientists attempt to reproduce the intense conditions at the center of the Earth, travel down the throat of a volcano, look into the deepest hole ever drilled, and imagine a voyage through enormous crystals of iron…all at the center of our incredible Earth.