Monthly Archives: December 2009

Blog

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10. If you forget the first nine suggestions, just focus on genuinely helping people, and the rest will take care of itself.

— How to Build a High-Traffic Web Site (or Blog), by Steve Pavlina

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2009.12.20 Sunday ACHK

Data loss

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There are two kinds of people in the world: Those who have experienced catastrophic hard drive failure, and those who will experience catastrophic hard drive failure.

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2009.12.19 Saturday ACHK

Medical physics

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Medical physics is the application of physics to medicine. It generally concerns physics as applied to medical imaging and radiotherapy, although a medical physicist may also work in many other areas of healthcare.

— Wikipedia on Medical physics

2009.12.18 Friday ACHK

Job: Focus 2

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The less you try to “stay loose” and open to anything,

the more precisely you define your skills

with Data/Information and/or People and/or Things in detail

and at the highest level you legitimately can claim,

the more likely you are to find a job.

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– What color is your parachute? 2005 Edition p.143 [Bold letters are mine]

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The more key words you type into Google,
the more likely you get the result you really want.

— Me@2009.12.12

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2009.12.18 Friday copyright ACHK

Quantum optics

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Quantum optics is a field of research in physics, dealing with the application of quantum mechanics to phenomena involving light and its interactions with matter.

Light is made up of particles called photons and hence inherently is “grainy” (quantized). Quantum optics is the study of the nature and effects of light as quantized photons.

Research into quantum optics that aims to bring photons into use for information transfer and computation is now often called photonics to emphasize the claim that photons and photonics will take the role that electrons and electronics now have.

— Wikipedia on Quantum optics

2009.12.17 Thursday ACHK

The You Show

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A friend was telling me about some job interviews she went on. She enjoyed them.

One approach is to be reactive, to sit where you’re supposed to sit, have your resume appear just so, wear what you’re supposed to wear and answer each and every question in the safe and secure way.

The other approach is to put on a show. To be in charge, to lead.

Some bosses don’t want to hire people who have a vision, a personality and a shtick. That’s okay. You don’t want to work for them anyway.

— Seth Godin

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2009.12.17 Thursday ACHK

Coherent state 2

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Coherent states in quantum optics

In quantum mechanics a coherent state is a specific kind of quantum state, applicable to the quantum harmonic oscillator, the electromagnetic field, etc. that describe a maximal kind of coherence and a classical kind of behavior.

— Wikipedia on Coherent state

2009.12.16 Wednesday ACHK

Coherent state

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For example, a classical electromagnetic field can be viewed as a coherent state of photons.

— Quantum Many-Particle Systems, J W Negele and H Orland, Addison-Wesley, 1988

2009.12.15 Tuesday ACHK

Passion

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* There are too many ideas and things and people. Too many directions to go. I was starting to believe the reason it matters to care passionately about something is that it whittles the world down to a more managable size.

* Most people yearn for something exceptional, something so inspiring that they’d want to risk everything for that passion, but few would act on it. It was very powerful and intoxicating to be around someone so alive.

— Susan Orlean

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2009.12.15 Tuesday ACHK

Quantum chaos

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Quantum chaos is a branch of physics which studies how chaotic classical systems can be shown to be limits of quantum-mechanical systems.

— Wikipedia on Quantum chaos

2009.12.14 Monday ACHK

Ten Years 2

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Good Software Takes Ten Years. Get Used To it.

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So, it takes a long time to write a good program, but when it’s done, it’s done.

Make a ten year plan. Make sure you can survive for 10 years, because the software products that bring in a billion dollars a year all took that long.

Good software, like wine, takes time.

— Joel Spolsky

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2009.12.14 Monday ACHK

Phasors

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Complex number method (Phasors) is the frequency response of the Laplace transform.

(Put s = j \omega, where j = \sqrt{-1}.)

— Me@2001

2009.12.12 Saturday (c) ACHK

Accelerator physics

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Accelerator physics deals with the problems of building and operating particle accelerators.

The experiments conducted with particle accelerators are not regarded as part of accelerator physics. These belong (according to the objectives of the experiments) to particle physics, nuclear physics, condensed matter physics, materials physics, etc. as well as to other sciences and technical fields.

— Wikipedia on Accelerator physics

2009.12.11 Friday ACHK

Coherent state and Fock state

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The Fock state (e.g. a single photon) is the most particle-like state; it has a fixed number of particles, and phase is indeterminate.

It should be noted that the notation | \alpha \rangle does not refer to a Fock state. For example, at \alpha = 1, one should not mistake |1 \rangle as a single-photon Fock state — it represents a Poisson distribution of fixed number states with a mean photon number of unity.

— Wikipedia on Coherent state

2009.12.10 Thursday ACHK