Geek magazine hacker daily blog

The closed Universe for housewives

1 year ago
The idea of writing of a note arose after reading of article about the closed Universe here. Actually, even it is rather after reading of one of comments to article:
To try to explain someone something through formulas … bad job. Who can transfer this article to the level of housewives?
Well, my dear Housewives (and also their husbands and children), we will start?

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Green power and nuclear silicon

1 year ago
I think very few people are aware that all renewable power depends on work of research nuclear reactors today. It is about the nuclear alloyed silicon (NAS) received in it which is used for production of high-voltage power semiconductors without which RES are impossible. And now is more detailed.

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12-pulsny rectifiers (hang at the left) ultrahigh-voltage transmission lines are important consumers nuclear too - the alloyed silicon.

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The closed Universe – as it turns out as it is simpler to explain it and why it is impossible to leave it

1 year ago

Introduction


Popular articles about cosmology where write about dark matter, early stages of the Universe, etc., is written much. However many people do not understand in general that the closed Universe, such as ours and why it is essentially impossible to leave it represents. A certain minimum of knowledge from the general relativity theory is for this purpose necessary. This article is written to explain to the interested these things, without resorting to the device of the general relativity theory (whenever possible). Nevertheless the good knowledge of a school course of physics and a certain minimum from the special relativity theory (SRT) is supposed. Let's begin to consider a question from the point of view of the Newtonian theory of universal gravitation.

1. As the closed world is formed.


Let's consider the homogeneous sphere consisting of matter which particles interact only according to the universal gravitation law. Such matter still call powdered. Certainly, such sphere cannot be in rest because of gravitational forces.

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Life in the Universe: from where it?

1 year ago
In article the hypothesis of a life origin in the Universe is offered. The assumption that the logic of laws of a structure of the world exists out of the Universe, i.e. out of space and time is its cornerstone. The offered hypothesis is unprovable also, as well as the majority of cosmological theories, however it seem to me plausible.

The Universe is a result of a logical output from nothing


We got used that scientific theories are created by people. Justice of theories is confirmed by practice. The part of theories is wrong, the part has narrow range of applicability. However among them there are true theories which are never refuted, and are only specified over time. It is probably possible to carry to them laws of Newton, Euclidian geometry, the object-oriented approach in programming. True theories are created not by people. They are only opened by them. And there were they always, including to the Big Bang.

The main idea of article consists that true theories exist until their opening, exist irrespective of space and time, are identical in all Universes and at their absence. I will explain this assumption.

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This is Science: microguns and nanokernels

1 year ago


What comes to your mind when you hear the word "down"?! Probably, something massive with a big destructive force. But what if you hear "a micro gun"?

Before the decline of 2015 in the prestigious scientific ACSNano log there was unusual article. Yes not just article, and the whole absolutely tall tale about microguns and microballistics!

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Third wave of Computing Hydrodynamics

1 year ago

Introduction


In this article history of development of modeling tools of a flow, heat transport, weight is described: emergence of the first commercial programs in the 1960-1980th, the next era of the methods based on an unstructured grid, which began approximately in the 1990th and ended in the middle of the 2000th. This era was characterized by emergence of computing hydrodynamics (VGD or CFD — Computational Fluid Dynamics) in scientific and design departments of the large companies. After these two big periods waves in development of commercial VGD of the software (S), the third wave is observed.



Figure 1. Modeling of a flow of air in the 1980th, Hanna and Parri (2011).

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ITER: results of 2015

1 year ago
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2015 became sign for the project of the international thermonuclear reactor. The new head of ITER Bernard Bigo (who replaced Osama Motodzhima in 2015) managed to break a trend of permanent growth of lag from terms and feeling that the project will collapse without having reached start. In the left year the strong-willed effort of the new director finished drawings of buildings of a complex and are transferred to builders that helped those to increase many times the rates of works on a site. Meanwhile, long developed industry, in 2015 came to cruising speed, and the first elements of the huge machine reached a site in Kadarashe. At last, the third important component of the project — development of superhi-tech elements of the machine by this moment shows success in the majority of the directions, and removes more and more risks that production will rest against technology deadlocks.

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Physical results of year

1 year ago


Hi, Giktayms! Outside the last days of December, so it is a high time to sum up the results of the expiring year together with the American physical community. Except opening of a pentaquark and inequalities Bella, mimivirusa, dark matter and the bursting balloons entered a short list. Welcome under kat.

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How to remove uranium peak on 10 thousand years

1 year ago
… or an educational program about the Closed Nuclear Fuel Cycle (CNFC).

Two the most perspective and at the same time criticized the concept of nuclear power is a managed thermonuclear reaction and short circuit of a nuclear toplivy cycle. More than sixty years passed from emergence of these power ideas, but the first of them did not take off a laboratory dressing gown, and the second remained in the form of single experiences "tried and threw". But if the thermonuclear power is a special history, with insidiousness of the nature and weakness of the person in a plot, then ZYaTTs stays in embryo for absolutely other reasons.

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Tablets from mix of dioxide of uranium and plutonium — a basis of today's ZYaTTs

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Ask Ethan No. 40: who pretends to be supernew there?

1 year ago
The reader asks:
I would like to learn more about space objects which can be confused with supernew. My favourite object. This Kiel just treats this type. It is very difficult to find material on this matter. It is surprising that these objects can throw out such number of weight and continue to exist.


Let's begin with that supernew which these objects pretend to be.

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From time to time very dim star in our galaxy (and in principle, in any galaxy) which usually it is not even visible to the naked eye suddenly becomes so bright that can become brightest than other stars in the sky. In the past they could shine even more brightly, than planets, and to become visible even in the afternoon. Initially they were called by "stella nova" ("a new star" in Latin), and these flashes supernew actually were the big events reporting about the termination of life of a star.

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