History Definition and 548 Threads

Hi all, I have a vehicle multibody model and I want to excite it in different conditions. So I'm thinking to use the PSD or road roughness as reported in the ISO 8608. What I don't understand is, how can I get an equivalent time history of the vertical road displacement from the PSD? thanks

Hey I am looking for a book talking about history of mathematics Steven Krantz has one here Amazon Amazon.com: Customer Reviews: An Episodic History of Mathematics: Mathematical Culture through Problem Solving (Maa Textbook) (Mathematical Association of America Textbooks) who know this book...

Today computer hardware is based on integrated circuits. Its based on digital logic and use transistors etc...(i am not an expert) But looking on the history of computer hardware- First computers were all mechanical which I understand because of lack of technology. And after than computer were...

I read somewhere that the "path of history" measured in some way can be modeled as Brownian motion with a mean collision time. There's been several very *specific* models such as: http://onlinelibrary.wiley.com/doi/10.1002/asm.3150030303/abstract However, what I'd like to know is that...

Does anybody know of some good books on world history specific to science topics? I'm looking for a good overview from the dawn of civilization to today, though I'd be content with a history that merely goes to the beginning of the 20th century. Currently my best candidate is this...

I was just wondering when the last time the global average temperature was 90 degrees F? Also wondering what a temperature of this extream would do to todays environment and life it self?

Hi all, Can anyone recommend a good book on the history of mathematics in very recent times (i.e. since the 20th century, specifically including the mathematical beginnings of computer science, game theory, chaos theory, complex systems, recent developments in stochastics etc.etc.)? Most...

It is worth reminding ourselves of this funny passage from A Brief History of Time

I'm quite curious about the history and development of oscilloscopes. Are there any recommended books on this topic?

Many popularized accounts of the development of quantum theory generally go like this: • Maxwell shows that all electromagnetic radiation is a variant of one phenomenon. • Experimental results measuring black body radiation are inconsistent with the radiation theory as understood. • Planck...

Do we know how we came up with the idea of matrices and determinants? How was the idea of solving linear equations using matrices and determiannts come up. I do not find it useful at all. Does anyone know a site which explains its history and usefulness?

In the opening chapter of "A Brief History of Time" Hawking writes, "We now know it is impossible to have an infinite static model of the universe in which gravity is always attractive". Can someone please explain this to me? I'm don't quite understand it.

I have been following this for the last few days, they launched the Falcon 9 rocket with the Dragon capsule on Tuesday, then Thursday had to perform a series of tests to make sure the Dragon spacecraft was working fine, now they are docking. They had to perform multiple tests on it to make...

Hello All, I wondered if anyone could fill in some details about the timeframe of FRW derivation. Was it derived to purposefully address the expansion of a universe? and if so, how did anyone know about this prior to Hubble's observations? Or was it derived for some other purpose and then...

The degree of the Earth's axis has changed throughout history. If I am not mistaken, I believe that people can make very accurate estimates about the historic degrees of the Earth's axial tilt. If this is the case, then I would like ask some questions 1. What was the degree of the...

I was studying the cathode ray experiment on how electron was discovered and the experiment uses battery for voltage. How did the people invent battery without knowing electrons and protons ( by chance?) And how was the name cathode and anode given without knowing which is positive and...

Ever since I (re)started my undergraduate mathematics studies I've been trying to get involved in some kind of research. Unfortunately it seems that most mathematics research is a bit out of reach for me until I get further along into my upper level classes. However, I have been taking a class...

As I'm starting studies in Pure Mathematics, I'd like to have a biblioagraphy to begin with. Then, can you give some bibliography to have an approach of the History oh Mathematics ?

Here is a history lecture about Reinhold Niebur [2007] ... [whom I sure don't remember! How many people have an 'ei' in one name and 'ie' in the other??] No reason to read the article regading this post. Illusions of Managing History: The Enduring Relevance of Reinhold Niebuhr...

Can someone suggest a good introduction to the history of physics, possibly not a tome but even not too simple. About 300 pages, with some formula, with intro to the basic concepts.

I've always gotten this impression from reading books and in history that a hundred or so years ago there were these guys that through their great inventions (especially later in the Ind. revolution?) that became socially accepted and revered as "inventors" and it was a pretty big deal and...

Anyone know how the theory of Uniform Circular Motion was discovered? I know Newton invented the word "centripetus", Latin for Centripetal but that's about it. I can find history on the pendulum but nothing for uniform circular motion. Could you give me some names? Or links to some...

Homework Statement A string with mass density u = 9.00 g/m extends from zero to infinity along the x-axis. It is under tension T = 25 N, and is driven by a mechanism at x = 0. The velocity of the drive mechanism depends on time as: vy(t) = 0 (if t = 0) 10.0 cm/s (if 0 < t ≤ 0.1 s)...

Hi, I'm a bit of a history nerd, and especially when it comes to World War II. I was wondering if you guys knew of any good books written about the events that led to World War II. Or if you just have a favorite book about World War II if it's your thing also. And when I say history book I mean...

How did Hamilton work out that action is the stationary quantity for a mechanical system? I've seen proofs that action is stationary, but it's unclear to me how Hamilton worked out that action as opposed to some other quantity should be stationary.

There seem to be several methods for calculating the orbital element. Newcomb, Laplace, Lagrange, Gauss, Olbers, ... I'm sure over time a new method came to light. However, what basically was the difference between a new method and the one it replaced? Improvements in calculations (computer)...

I was looking for a few good references for the history of the development of acceleration as a concept. Is there a Galilean dialogue that covers this?

I am trying to get an intuition behind the cross product but i seem to get stuck with understanding why we make the vector perpendicular to the other two? I understand the need to define an orientation for physical systems like torque (ccw or cw) but then why make it a vector and why choose...

It has been a year for the history books. What were the major events of 2011? I put the Arab Spring, Libya, leaving Iraq, and getting Bin Laden, right at the top of the list.

Monarchy I will define as a system of government where the leaders are succeeded by their children or other family members and/or where the leaders pick their successors. By contrast, the leader of a republic is chosen by some set of unrelated people, anything from the citizens to a council of...

With the normal Zeeman effect, I think the splitting of the emission/absorbtion lines is worth \Delta E = \mu _B B m_l. That was before they knew about the spin. When they discovered the spin they realized that in fact the energy splitting was worth \Delta E =g_l \mu _B B m_l where...

Fellow nerds will probably find the following blog post of great interest. EDIT: Removed link It is an alternative analysis with respect to Kurzweil's technological singularity proposal. Essentially anyone interested in topics like history in general and futuristic predictions will not...

please tell me some one. How do I clear my Internet browser history?

I've been Googling to find out how Einstein worked out his famous equation. Some texts (that may or may not be factual) suggest it was an educated guess and not even expressed as the equation initially. Wiki http://en.wikipedia.org/wiki/E%3Dmc2#Einstein:_mass.E2.80.93energy_equivalence" that...

I know the Cauchy criterion for a convergent sequence. A Cauchy sequence is one in which the distance between successive terms becomes smaller and smaller. You can find a number N such that the terms after that, pairwise, have a a distance that is less than epsilon. After looking at an...

Hi To gain a more intuitive understanding of physics, I want to learn about the experiments that led to the formulations of the theories. What books can you guys recommend?

I'm looking for a book that might teach me how to read diffraction patterns and infer structure. I'm also interested in the history of the technique. This is mainly so I can explain it with confidence to high school students and college freshmen as a teacher. I feel like I never really went...

When were the first diamonds in history recorded?

This is from my History of Mathematics course. Well, I centered the hyperbola at the origin and found the derivative. It gives me the slope of the tangent line at whatever point I want. How do I prove this?

[SIZE="2"]I was browsing the internet one day when i stumbled upoun this article and i have to say i was completely blown away! so i thought why not post it here http://www.cracked.com/article/197_the-7-most-badass-last-stands-in-history-battle/

Wouldn't that suggest that life is a rare event in the universe? If it were common, shouldn't we expect it to have developed more than once on Earth?

Old Pascal/Delphi programmer here with a question about c. I can kinda make my way around in c/c++ but I'm no expert. I always thought the "struct" data type in c was just a mixed data type similar to "record" in Pascal. Now I find that "struct" in c++ can have member functions and basically...

Hello everyone. I am the author of "Wormwood Forest: A Natural History of Chernobyl" and stumbled upon your very interesting forum when googling Genn Saji, a Japanese nuclear scientist who has been sending out daily email updates about Fukushima. I am fortunate enough to be on his list and...

http://www.ted.com/talks/honor_harger_a_history_of_the_universe_in_sound.html?utm_source=newsletter_weekly_2011-06-29&utm_campaign=newsletter_weekly&utm_medium=email" Honor Harger http://www.ted.com/talks/janna_levin_the_sound_the_universe_makes.html" Janna Levin Ringing of space... then...

Just another great video on youtube. Thought it was worth sharing. Sorry if it's a bit too sentimental or emotional. But, I guess there is a good reason that it is so. Anyways post what you think, thanks.

I was thinking about artificial selection stories and so far I've thought of samurai crabs, domesticated dogs, super-cattle, and super/modern-corn. I'd like to hear some of your favorite evolutionary stories of natural or human-caused evolution.

History Channel, great review "Joking!" This article at cracked dot com is really spot on and funny to boot. I did find one bad word on the page, so don't read that word. The entire article is worth reading. I especially love their table at the beginning. It made me *snork*. :-p...

For personal purposes, I'm trying to summarize the last 14 billion years. How accurate is the following? Any thoughts welcome, thanks! Most scientists believe the universe is at least 14 billion years old based on evidence about the relative movement and expansion of galaxies and other...

I mean to say whose popular sci-books do you like more Stephen Hawking's or Roger Penrose 's ? I like Penrose as he doesn't shy from using mathematics. So he is likely to present a better picture to the general public. And that may even ignite their interest in mathematics. Also he...

When considering the best path to US solvency, it might be useful to consider the tax rates that helped to build this country. Back when Kennedy took office, the top marginal tax rate was 91%. Today, it is 35%. http://www.taxfoundation.org/publications/show/151.html It appears to me that...