Point-by-point inscription of apodized fiber Bragg gratings

We demonstrate apodized fiber Bragg gratings inscribed with a point-by-point technique. We tailor the grating phase and coupling amplitude through precise control over the longitudinal and transverse position of each laser-inscribed modification. This method of apodization is facilitated by the highly-localized, high-contrast modifications generated by focussed IR femtosecond laser inscription. Our technique provides a simple method for the design and implementation of point-by-point fiber Bragg gratings with complex apodization profiles.Comment: 6 pages, 4 figures, article in revie

Measuring ambivalence about government in the 2006 ANES Pilot Study.

Although scholars increasingly recognize that people often possess multiple and even conflicting attitudes about a given topic, our understanding of the nature, causes, and consequences of such attitudinal ambivalence is limited by a lack of consensus as to how the concept should be operationalized. In this paper, we examine three separate measures (one subjective, two operative) of ambivalence regarding the federal government in Washington that were asked in the 2006 ANES Pilot Study. Our findings indicate that while the operative measures are less susceptible to question-order and response-order effects, none of the three indicators fares particularly well in various other tests of construct validity

Bayesian feedback control of a two-atom spin-state in an atom-cavity system

We experimentally demonstrate real-time feedback control of the joint spin-state of two neutral Caesium atoms inside a high finesse optical cavity. The quantum states are discriminated by their different cavity transmission levels. A Bayesian update formalism is used to estimate state occupation probabilities as well as transition rates. We stabilize the balanced two-atom mixed state, which is deterministically inaccessible, via feedback control and find very good agreement with Monte-Carlo simulations. On average, the feedback loops achieves near optimal conditions by steering the system to the target state marginally exceeding the time to retrieve information about its state.Comment: 4 pages, 4 figure

Structure-function mapping of a heptameric module in the nuclear pore complex.

The nuclear pore complex (NPC) is a multiprotein assembly that serves as the sole mediator of nucleocytoplasmic exchange in eukaryotic cells. In this paper, we use an integrative approach to determine the structure of an essential component of the yeast NPC, the ~600-kD heptameric Nup84 complex, to a precision of ~1.5 nm. The configuration of the subunit structures was determined by satisfaction of spatial restraints derived from a diverse set of negative-stain electron microscopy and protein domain-mapping data. Phenotypic data were mapped onto the complex, allowing us to identify regions that stabilize the NPC's interaction with the nuclear envelope membrane and connect the complex to the rest of the NPC. Our data allow us to suggest how the Nup84 complex is assembled into the NPC and propose a scenario for the evolution of the Nup84 complex through a series of gene duplication and loss events. This work demonstrates that integrative approaches based on low-resolution data of sufficient quality can generate functionally informative structures at intermediate resolution

Winners, losers, and perceived mandates : voter explanations of the 1998 Gubernatorial and 2000 Presidential elections in Florida.

Elections are sometimes seen as legitimizing institutions, promoting system-level support among citizens by providing them with input into the political process. However, prior research has found that is less true among the supporters of losing candidates, who often exhibit lower levels of political trust and satisfaction with democracy. We analyze two statewide surveys in Florida (following the gubernatorial and senatorial elections of 1998, and the controversial presidential election of 2000), and find that (1) losers do exhibit lower levels of political trust, satisfaction with democracy, and beliefs that government is responsive to citizens; (2) losers also are more likely to endorse sour grapes rationalizations of the election outcome, and less likely to accept mandate interpretations; (3) the meanings that voters ascribe to the election mediate the relationship between winning/losing and political trust, but have limited effects on other system support variables; and (4) perceptions of procedural fairness moderate the relationships between candidate support and system support. These findings suggest that the so-called legitimizing function of elections is far from a universal phenomenon

Resonant electron transmission through a finite quantum spin chain

Electron transport in a finite one dimensional quantum spin chain (with ferromagnetic exchange) is studied within an $s-d$ exchange Hamiltonian. Spin transfer coefficients strongly depend on the sign of the $s-d$ exchange constant. For a ferromagnetic coupling, they exhibit a novel resonant pattern, reflecting the salient features of the combined electron-spin system. Spin-flip processes are inelastic and feasible at finite voltage or at finite temperature.Comment: 4 pages including 4 .eps figure

The Programmer's Assistant: Conversational Interaction with a Large Language Model for Software Development

Large language models (LLMs) have recently been applied in software engineering to perform tasks such as translating code between programming languages, generating code from natural language, and autocompleting code as it is being written. When used within development tools, these systems typically treat each model invocation independently from all previous invocations, and only a specific limited functionality is exposed within the user interface. This approach to user interaction misses an opportunity for users to more deeply engage with the model by having the context of their previous interactions, as well as the context of their code, inform the model's responses. We developed a prototype system -- the Programmer's Assistant -- in order to explore the utility of conversational interactions grounded in code, as well as software engineers' receptiveness to the idea of conversing with, rather than invoking, a code-fluent LLM. Through an evaluation with 42 participants with varied levels of programming experience, we found that our system was capable of conducting extended, multi-turn discussions, and that it enabled additional knowledge and capabilities beyond code generation to emerge from the LLM. Despite skeptical initial expectations for conversational programming assistance, participants were impressed by the breadth of the assistant's capabilities, the quality of its responses, and its potential for improving their productivity. Our work demonstrates the unique potential of conversational interactions with LLMs for co-creative processes like software development.Comment: 43 pages, 3 figures. To be published in IUI 202