We Bring Light To A Dark Generation Mp3 Download

Physicists believe dark matter could be made of difficult-to-detect particles called Weakly Interacting Massive Particles or WIMPs, which usually pass through ordinary matter without leaving a trace. The current LUX experiment consists of a one-third ton liquid xenon detector that sits deep underground where it is shielded from cosmic rays and poised to find WIMPs. When one of these particles passes through the xenon detector, it should occasionally produce an observable flash of light.

Organisms are believed to have evolved circadian clocks as adaptations to deal with cyclic environmental changes, and therefore it has been hypothesized that evolution in constant environments would lead to regression of such clocks. However, previous studies have yielded mixed results, and evolution of circadian clocks under constant conditions has remained an unsettled topic of debate in circadian biology. In continuation of our previous studies, which reported persistence of circadian rhythms in Drosophila melanogaster populations evolving under constant light, here we intended to examine whether circadian clocks and the associated properties evolve differently under constant light and constant darkness. In this regard, we assayed activity-rest, adult emergence and oviposition rhythms of D. melanogaster populations which have been maintained for over 19 years (~330 generations) under three different light regimes - constant light (LL), light-dark cycles of 12:12 h (LD) and constant darkness (DD). We observed that while circadian rhythms in all the three behaviors persist in both LL and DD stocks with no differences in circadian period, they differed in certain aspects of the entrained rhythms when compared to controls reared in rhythmic environment (LD). Interestingly, we also observed that DD stocks have evolved significantly higher robustness or power of free-running activity-rest and adult emergence rhythms compared to LL stocks. Thus, our study, in addition to corroborating previous results of circadian clock evolution in constant light, also highlights that, contrary to the expected regression of circadian clocks, rearing in constant darkness leads to the evolution of more robust circadian clocks which may be attributed to an intrinsic adaptive advantage of circadian clocks and/or pleiotropic functions of clock genes in other traits.

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Got my first kindle, a current gen (4th? I put 7th in the title but I think that is wrong) kindle paperwhite. I have super sensitive eyes so got it to try to read in the dark. I have it in dark mode with the light set to 9.

When two light fields resonantly drive transitions from two different atomic ground states to a common excited state, forming a three-level lambda-type system, the quantum-mechanical transition amplitudes to that state can interfere destructively. This inhibits excitation and produces a superposition between the two ground states, called a dark state1. Dark states give rise to electromagnetically induced transparency2 and slow light3, appear in lasing without inversion4, are employed for producing5 and storing6 single photons in quantum networks7,8, and are widely used in physics and chemistry in the form of a stimulated Raman adiabatic passage9.

The main advantage of such dark states is that they protect the system from decoherence related to the excited state. They are thus ideal for continuous experiments with atomic cycling currents involving the excited state, as the removal of the decay channel allows the cycle to run for a longer period. Unfortunately, attempting to close the lambda system and generating a cycling current with a third field that directly couples the two ground states results in the destruction of the dark state, except in the restricting case when both driving strengths of the lambda subsystem are equal10. In general, the breakdown of the dark state in such a system brings population to the excited atomic state. Thus, decoherence is reintroduced via atomic decay and additional loss channels are opened via depumping to, e.g., states outside the cycle.

As we report here, this breakdown can be mitigated by replacing one of the coherent driving fields of the closed cycle by an optical cavity strongly coupled to the corresponding atomic transition. In this case the entanglement of the atomic ground states with the photon number in the cavity effectively preserves the destructive interference of atomic excitation amplitudes, and thus, the dark states. The possibility to have any number of photons in the cavity furthermore produces an infinite harmonic ladder of dark states that can be used to produce either quantum or coherent light11. Replacing a laser with a cavity has the further advantage that it introduces in the otherwise decoherence-free subspace in which the system operates, a well-defined dissipation channel through which the system dynamics can be observed in real time.

The Hamiltonian in Eq. (4) describes the generation of photons in the cavity mode via transitions between different dark states that avoid exciting the atom. It also shows that although transitions between each pair of subsequent dark states in the ladder are possible, the transition strengths and the decay rates of the dark states (as Fig. 1c shows) change in a highly nonlinear fashion with the excitation rung. In fact, the decrease in driving strength to, along with the increase in decay rate from, the higher-lying dark states, results in a restriction of the Hilbert space to lower photon number states, leading to a quantum Zeno effect18. As a result, the system is restricted to the first two dark states, where it behaves like a two-level atom and higher rungs are blocked.

The closed cycling scheme presented here is generic and could be implemented in all strongly coupled cavity systems to suppress emitter excitation. This is particularly relevant, for instance, in the fluorescence observation of molecules, where excitation leads to rapid depumping to uncoupled rovibrational states. In addition to creating more photons, our method has the additional advantage that it provides a background-free signal as the newly generated field is of completely different frequency than the input drivings. Further prospects are opened up by increasing the driving strength 12 between the two ground states. This can result, e.g., in the generation of Schrdinger-cat states of light11. Our scheme is also interesting for the investigation of cycles that simulate Hamiltonians from many-body physics under continuous observation20. Finally, closed cycles driven by light fields at the single-photon level could offer intriguing possibilities for the realization of quantum heat engines where cavity fields could act as non-classical heat baths along the thermodynamic cycle21.

The light-dark() CSS function enables setting two colors for a property - returning one of the two colors options by detecting if the developer has set a light or dark color scheme or the user has requested light or dark color theme - without needing to encase the theme colors within a prefers-color-scheme media feature query. Users are able to indicate their color-scheme preference through their operating system settings (e.g. light or dark mode) or their user agent settings. The light-dark() function enables providing two color values where any value is accepted. The light-dark() CSS color function returns the first value if the user's preference is set to light or if no preference is set and the second value if the user's preference is set to dark.

By default, in supporting browsers, the color returned by the light-dark() color function depends on the user preference set through an operating system's settings (e.g., light or dark mode) or from a user agent setting. You can also change this setting in the browser's developer tools.

In addition to enabling the light-dark() function, the color-scheme property enables overriding a user's color scheme for document sections. Forcing a page section to only use a light or dark color scheme can be done by setting the color-scheme property to light or dark.

\n The light-dark() CSS function enables setting two colors for a property - returning one of the two colors options by detecting if the developer has set a light or dark color scheme or the user has requested light or dark color theme - without needing to encase the theme colors within a prefers-color-scheme media feature query.\n Users are able to indicate their color-scheme preference through their operating system settings (e.g. light or dark mode) or their user agent settings. The light-dark() function enables providing two color values where any value is accepted. The light-dark() CSS color function returns the first value if the user's preference is set to light or if no preference is set and the second value if the user's preference is set to dark.\n

Each day, the sun rises to warm, illuminate, and provide growth on earth. The moon and stars light the night, serving as navigators long before smartphones. We reach for the light-switch when we enter a dark room, and we depend on our accumulation of knowledge to shed light on our lives. Light permeates into every crack and crevice of our lives and beings, whether visible, tangible in regard to warmth, or metaphorically enlightening. The origin of phos describes how light makes manifest, evident, exposed or clear. e24fc04721