Daniel Kleppner’s research while affiliated with Massachusetts Institute of Technology and other places

... Albert Einstein publicou três trabalhos revolucionários no ano de 1905, um trabalho sobre o Movimento Browniano, outro sobre a Relatividade e um terceiro sobre o Efeito Fotoelétrico, no qual propôs uma hipótese da quantização da radiação eletromagnética pela qual, em certos processos, a luz comporta-se como pacotes concentrados de energia, chamados fótons (KLEPPNER, 2005). ...

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Uma Sequência Didática Investigativa para a Aprendizagem Conceitual do Efeito Fotoelétrico

... Cavity quantum electrodynamics (CQED) [1] is the study of the interaction between matter and photons confined in a cavity. In the Jaynes-Cummings model [2] the matter is described using the two-level approximation, and only a single cavity mode is taken into account. ...

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Off resonance coupling between a cavity mode and an ensemble of driven spins

... Due to the limited time frame in which a missile is in boost phaseabout three minutes for a solid-fueled intercontinental ballistic missile (ICBM) -SBIs face a simple, but significant technical challenge: being in the right place at the right time (Barton 2004). Due to this constraint, kinetic hit-to-kill SBIs must be placed in low Earth orbit, since higher altitudes would leave the interceptors too far away to reach a missile while it is still in boost phase. ...

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Why a space-based missile interceptor system is not viable

... Most images that created cardiac images were not completely clear and some contain Signal Noise Ratio (SNR), which affected myocardial borders detection. The result of tissue recognition matches the initial in-memory outcome comparing with others studies using different segmentation techniques comparing with other scientifical results[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. ...

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Segmentation of heart tissues using gathering and colour analysis techniques

... Understanding the psychological mechanism underpinning the pro-vaccination and anti-vaccination groups' behaviors is essential to explaining their actions. Science is the backbone of modern society's medical and technological achievements; nonetheless, many people have lost faith in science, and a powerful anti-scientific counterculture has formed (Holton, 1993;Lu & Sun, 2022). ...

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Developing and validating a framework to explain cruise travel intention in the United States: a crisis management perspective

... Pour mieux faire, il serait souhaitable soit de peupler optiquement le niveau métastable soit d'étudier une transition provenant de l'état fondamental (plus d'atomes). Dans le premier cas, il y a déjà une expérience en cours au MIT où des atomes d'hydrogène confinés dans un piège magnétique sont excités dans l'état 2S via deux photons à 243 nm [34]. Pour mieux contrôler les effets systématiques, il serait utile d'étudier plusieurs transitions du type 2S-nS. ...

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Studies of atomic systems by laser spectroscopy. Tests of fundamental physics and development of an optical frequency standard.

... Summing over all trajectories gives a smooth result which diverges at extrema of P f (x i ). The "primitive" semiclassical wave function in momentum space is obtained via the same method as in [62], and is similar to the methods in [69][70][71][72][73][74][75][76][77][78][79]. For each p f at the final time t f , we sum semiclassical terms ...

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Ballistic atom pumps

... This generalization is possible because of the well-known fact that quantum systems mathematically have a classical Hamiltonian structure [7,8]. A recent development in the field of ultracold atoms is to use Feshbach resonances [9] or a stimulated optical Raman transition [10,11] to convert two atoms into a molecule. This kind of atom-molecule systems can be well described by a mean-field theory and can become nonlinear systems when both the atoms and the molecules are bosons and the number of particles in this system is large. ...

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Berry connection in atom-molecule systems

... Consequently, the recurrence spectrum provides a quantum picture of classical behavior. [6] "circular states have found applications in cavity quantum electro-dynamics, metrology, collisions, and intense radiation field dynamics". [7] Is it a death radius or a true radius of the ground state ? ...

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On the Atomic Structure

... A schematic representation of the experimental apparatus is shown in figure 3. Machined from Cryo-G10, the BGC cell is thermally anchored to the mixing chamber of a dilution refrigerator by high-purity copper braids [35]. Thermal conductivity along the cell length is provided by copper wires running vertically along the outer Cryo-G10 walls. ...

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Axion dark matter detection by laser spectroscopy of ultracold molecular oxygen: A proposal