New Trends in the Insulation Technology of Rotating High Voltage Machines

INTRODUCTION:
    The driving force of material and process development in the insulation technology of rotating high voltage machines has changed in the last five to ten years. Being mainly technology driven in the past, cost has become more and more the determining factor in the industry. Improvements in products or processing are only accepted if they reduce overall cost. On the other hand, high voltage motors and generators are long-life capital goods and a reduction in reliability cannot be tolerated. Any development of new insulating materials has to reflect these facts to be successful in the market.

Humidity changes color of birds' feathers, biologists discover

Tree swallows' iridescent feathers change from blue-green to muted yellow when exposed to humidity. The plumage reverses to previous color tones as humidity decreases.
    This discovery by Chad Eliason, a University of Akron integrated bioscience Ph.D. program student, and Dr. Matthew Shawkey, assistant professor of biology and integrated bioscience, is published in the Sept. 27 issue of Optics Express, the international journal of optics.
    The finding has implications ranging from technology (color and vapor sensors) to biology (mate choice), according to the researchers.

Gravitational interaction of antimatter

Abstract:
    This paper formulates gravitational interaction between matter and antimatter by applying the referenced model.
    Until now, there is no experimental evidence on the gravitational behaviour of antimatter. While we may be confident that antimatter attracts antimatter, we do not know anything on the interaction between matter and antimatter. We investigate this issue on theoretical grounds. Starting from the CPT invariance of physical laws, we transform matter into antimatter in the equations of both electrodynamics and gravitation. In the former case, the result is the well-known change of sign of the electric charge. In the latter, we find that the gravitational interaction between matter and antimatter is a mutual repulsion. This result supports cosmological models attempting to explain the Universe accelerated expansion in terms of a matter-antimatter symmetry.

THE WIRELESS TRANSMISSION OF ELECTRICAL ENERGY

Introduction:
    It is possible that Nikola Tesla is best known for his remarkable statements regarding the wireless transmission of electrical power. His first efforts towards this end started in 1891 and were intended to simply "disturb the electrical equilibrium in the nearby portions of the earth... to bring into operation in any way some instrument." In other words the object of his experiments was simply to produce effects locally and detect them at a distance. By 1899 the electrical potential of his transmitter had increased to the point that more room was needed for the sake of safety. This and other considerations led him to temporarily shift his wireless experiments to a location just outside of Colorado Springs.

ANDROID

Introducing Android

    The mobile development community is at a tipping point. Mobile users demand more choice, more opportunities to customize their phones, and more functionality. Mobile operators want to provide value-added content to their subscribers in a manageable and

lucrative way. Mobile developers want he freedom to develop the powerful mobile applications users demand with minimal roadblocks to success. Finally, handset manufacturers want a stable, secure, and affordable platform to power their devices. Upuntil now single mobile platform has adequately addressed the needs of all the parties.

    Enter Android, which is a potential game-changer for the mobile development community. An innovative and open platform,Android is well positioned to address the growing needs of the mobile marketplace.

    This chapter explains what Android is, how and why it was developed, and where the platform fits in to the established mobile marketplace.

BARCODE

    A barcode is an optical machine-readable representation of data, which shows certain data on certain products. Originally, barcodes represented data in the widths (lines) and the spacings of parallel lines, and may be referred to as linear or 1D (1 dimensional) barcodes or symbologies. They also come in patterns of squares, dots, hexagons and other geometric patterns within images termed 2D (2 dimensional) matrix codes or symbologies. Although 2D systems use symbols other than bars, they are generally referred to as barcodes as well. Barcodes can be read by optical scanners called barcode readers, or scanned from an image by special software.

Why use barcodes?

    As far back as the 1960s, barcodes were used in industrial work environments. Some of the early implementations of barcodes included the ability identify rail road cars.

    In the early 1970s, common barcodes started appearing on grocery shelves. To automate the process of identifying grocery items, UPC barcodes were placed on products.

    Today, barcodes are just about everywhere and are used for identification in almost all types of business.

    When barcodes are used in the business process, procedures are automated to increase productivity and reduce human error.

    Whenever there is a need to accurately identify or track something, bar-coding should be used. For example, in a data entry work environment, workers may be required to enter an enormous amount of data into a customer database system.

    Instead of manually typing a customer identification number into a database, if the information is contained in a barcode, a data entry operator may scan it in. This would increase automation and reduce human error.

IMPORTANT MOBILE TERMS

Here in this post we tell you about some important terms associated with mobile phone, now a days which is a daily need for all of us.


SIM:  Subscriber Identity Module card is a link to the mobile service providers network.  It bears an international mobile station identity that is linked to a mobile phone number. e.g., SIM Serial No 8991762100212001259 can be linked to Mobile no (MSISDN) 9437001259

Byomkesh Bakshi

Next part of Byomkesh......

7. Click here to download Agniban.

8. Click here to download Upasanghar

9. Click here to download Raktamukhi Neela

10. Click here to download Byomkesh o Barada

11. Click here to download Chitrachor

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Byomkesh Bakshi

Some more on Byomkesh Bakshi......


3. Click here to download Seemanta-Heera

4. Click here to download Makarsha'r Ras

5. Click here to download Arthamanartham

6. Click here to download Chorabali

Byomkesh Bakshi

Today what I'll post here that is something different from science and engineering.
Byomkesh Bakshi (ব্যোমকেশ বক্সী) is a fictional detective in Bengali literature created by Sharadindu Bandyopadhyay.
Here I'll post all the 33 stories of Byomkesh Bakshi by Sharadindu Bandyopadhyay one by one.
Please download and enjoy it.

1. Click here to download Satyanweshi

2. Click here to download Pather Kanta

ANTIMATTER (part 5/5)

Antimatter for daily use

    Antimatter - a mirror image of matter - is an idea so revolutionary that even its discoverer initially feared its consequences. It annihilates with ordinary matter, disappearing in a puff of energy - the ultimate scientific experiment.

    This annihilation is a compelling scenario for science fiction. The first example was robots with brains having antimatter pathways.

    Transforming all its mass into pure energy, antimatter is the perfect fuel. Star Trek's faster-than-light science-fiction spaceships use antimatter power, but research projects have also investigated the use of antimatter fuel for real.

ANTIMATTER (part 4/5)

COST
    Scientists claim antimatter is the costliest material to make. In 2006, Gerald Smith estimated $250 million could produce 10 milligrams of positrons (equivalent to $25 billion per gram); and in 1999 NASA gave a figure of $62.5 trillion per gram of antihydrogen. This is because production is difficult (only a few antiprotons are produced in reactions in particle accelerators), and because there is higher demand for the other uses of particle accelerators. According to CERN, it has cost a few hundred million Swiss Francs to produce about 1 billionth of a gram (the amount used so far for particle/antiparticle collisions).

ANTIMATTER (part 3/5)

Antimatter Production
    Scientists in 1995 succeeded in producing antiatoms of hydrogen, and also antideuterium nuclei, made out of an antiproton and an antineutron, but no antiatom more complex than antideuterium has been created yet. In principle, antiatoms of any element could be built from readily available sources of antiparticles. Such antiatoms would have exactly the same properties as their normal-matter counterparts. The production of antielements in bulk quantities seems unlikely to ever become achievable, however.

ANTIMATTER (part 2/5)

History of Antimatter

In 1928 Paul Dirac developed a relativistic equation for the electron, now known as the Dirac equation. Curiously, the equation was found to have negative energy solutions in addition to the normal positive ones. This presented a problem, as electrons tend toward the lowest possible energy level; energies of negative infinity are nonsensical. As a way of getting around this, Dirac proposed that the vacuum be considered a "sea" of negative energy, the Dirac sea. Any electrons would therefore have to sit on top of the sea.

ANTIMATTER (part 1/5)

Antimatter or contra-terrene matter is matter that is composed of the antiparticles of those that constitute normal matter. If a particle and its antiparticle come in contact with each other, the two annihilate and produce a burst of energy, which results in the production of other particles and antiparticles or electromagnetic radiation. In these reactions, rest mass is not conserved, although (as in any other reaction) energy is conserved.

What is Antimatter?

    This isn't a trick question. Antimatter is exactly what you might think it is -- the opposite of normal matter, of which the majority of our universe is made. Until just recently, the presence of antimatter in our universe was considered to be only theoretical. In 1928, British physicist Paul A.M. Dirac revised Einstein's famous equation E=mc2. Dirac said that Einstein didn't consider that the "m" in the equation -- mass -- could have negative properties as well as positive. Dirac's equation (E = + or - mc2) allowed for the existence of anti-particles in our universe. Scientists have since proven that several anti-particles exist.

Electrical Engineering- know it all

This is a complete reference of electrical engineering.
It includes basic electrical engineering, analogue & digital electronics, circuit simulations, microprocessors & microcontrollers, power electronics, signals & signal processing, filter design, control & instrumentation system, communication system, electromagnetic & field theory, electrical machines.

To download please click here.
Screenshoot-

ULTRACONDUCTOR

ULTRACONDUCTOR™ defination: An electrical conductor, similar to present-day superconductors, having zero measurable electrical resistance in one dimension. They consist of organic polymers that exhibit electrical resistance much lower than the best metallic conductors and are considered a novel state of matter.

Ultraconductors™ are patented materials being developed for commercial applications. They are made by the sequential processing of amorphous polar dielectric elastomers. They exhibit a set of anomalous magnetic and electric properties, including: very high electrical conductivity (> 1011 S/cm -1) and current densities (> 5 x 108 A/cm2) over a wide temperature range (1.8 to 700 K). Additional properties established by experimental measurements include: the absence of measurable heat generation under high current; thermal versus electrical conductivity orders of magnitude in violation of the Wiedemann-Franz law; a jump-like transition to a resistive state at a critical current; a nearly zero Seebek coefficient over the temperature range 87 - 233 K; no measurable resistance when Ultraconductor™ films are placed between superconducting tin electrodes at cryogenic temperatures.

    

Dictionary of electrical engineering

Here you can get The Dictionary of Electrical Engineering.
It is very useful for engineering students and professionals.
To download please click here
Please download and post comment on it.
Sample screen-shots of it-

Welcome

Hi.........
This is Anirban, a new member of the world of blogging.
Here I'll try to share some articles, files and many more.......