ODD Structures and Where to Find Them

In the past twenty years, the technical setup of the Music Encoding Initiative (MEI) data framework has been adjusted several times. Each of those transitions was motivated by the wish to improve the ways in which MEI could be integrated with other formats, to simplify the maintenance of MEI, and to encourage more people to actively contribute to the development of MEI. Some of those objectives are contradictory, and accordingly, there is no single right answer for all times about the best possible technical setup for MEI. The main purpose of this poster is to give a historical overview of the technical setups that MEI has gone through in the 20 or so years of its existence, and to illustrate the current workflows. Ideally, this empowers wider parts of the community to contribute to the continued development of both the MEI specification and documentation. Eventually, it will explain the steps necessary to set up a local working environment to participate in these developments

Converging Perturbative Solutions of the Schroedinger Equation for a Two-Level System with a Hamiltonian Depending Periodically on Time

We study the Schroedinger equation of a class of two-level systems under the action of a periodic time-dependent external field in the situation where the energy difference 2epsilon between the free energy levels is sufficiently small with respect to the strength of the external interaction. Under suitable conditions we show that this equation has a solution in terms of converging power series expansions in epsilon. In contrast to other expansion methods, like in the Dyson expansion, the method we present is not plagued by the presence of ``secular terms''. Due to this feature we were able to prove absolute and uniform convergence of the Fourier series involved in the computation of the wave functions and to prove absolute convergence of the epsilon-expansions leading to the ``secular frequency'' and to the coefficients of the Fourier expansion of the wave function

Orion Spacecraft MMOD Protection Design and Assessment

The Orion spacecraft will replace the Space Shuttle Orbiter for American and international partner access to the International Space Station by 2015 and, afterwards, for access to the moon for initial sorties and later for extended outpost visits as part of the Constellation Exploration Initiative. This work describes some of the efforts being undertaken to ensure that the Constellation Program, Orion Crew Exploration Vehicle design will meet or exceed the stringent micrometeoroid and orbital debris (MMOD) requirements set out by NASA when exposed to the environments encountered with these missions. This paper will provide a brief overview of the approaches being used to provide MMOD protection to the Orion vehicle and to assess the spacecraft for compliance to the Constellation Program s MMOD requirements

In-facility transport code review

The following computer codes were reviewed by the In-Facility Transport Working Group for application to the in-facility transport of radioactive aerosols, flammable gases, and/or toxic gases: (1) CONTAIN, (2) FIRAC, (3) GASFLOW, (4) KBERT, and (5) MELCOR. Based on the review criteria as described in this report and the versions of each code available at the time of the review, MELCOR is the best code for the analysis of in-facility transport when multidimensional effects are not significant. When multi-dimensional effects are significant, GASFLOW should be used

Ballistic Performance of Porous Ceramic Thermal Protection Systems at 9 km/s

Porous-ceramic, thermal-protection-systems are used heavily in current reentry vehicles like the Orbiter, and they are currently being proposed for the next generation of manned spacecraft, Orion. These materials insulate the structural components and sensitive electronic components of a spacecraft against the intense thermal environments of atmospheric reentry. Furthermore, these materials are also highly exposed to space environmental hazards like meteoroid and orbital debris impacts. This paper discusses recent impact testing up to 9 km/s on ceramic tiles similar to those used on the Orbiter. These tiles have a porous-batting of nominally 8 lb/cubic ft alumina-fiber-enhanced-thermal-barrier (AETB8) insulating material coated with a damage-resistant, toughened-unipiece-fibrous-insulation (TUFI) layer

ODD Structures and Where to Find Them

In the past twenty years, the technical setup of the Music Encoding Initiative (MEI) data framework has been adjusted several times. Each of those transitions was motivated by the wish to improve the ways in which MEI could be integrated with other formats, to simplify the maintenance of MEI, and to encourage more people to actively contribute to the development of MEI. Some of those objectives are contradictory, and accordingly, there is no single right answer for all times about the best possible technical setup for MEI. The main purpose of this poster is to give a historical overview of the technical setups that MEI has gone through in the 20 or so years of its existence, and to illustrate the current workflows. Ideally, this empowers wider parts of the community to contribute to the continued development of both the MEI specification and documentation. Eventually, it will explain the steps necessary to set up a local working environment to participate in these developments

Identification of target-specific bioisosteric fragments from ligand-protein crystallographic data

Bioisosteres are functional groups or atoms that are structurally different but that can form similar intermolecular interactions. Potential bioisosteres were identified here from analysing the X-ray crystallographic structures for sets of different ligands complexed with a fixed protein. The protein was used to align the ligands with each other, and then pairs of ligands compared to identify substructural features with high volume overlap that occurred in approximately the same region of geometric space. The resulting pairs of substructural features can suggest potential bioisosteric replacements for use in lead-optimisation studies. Experiments with 12 sets of ligand-protein complexes from the Protein Data Bank demonstrate the effectiveness of the procedure

Progress with the Upgrade of the SPS for the HL-LHC Era

The demanding beam performance requirements of the High Luminosity (HL-) LHC project translate into a set of requirements and upgrade paths for the LHC injector complex. In this paper the performance requirements for the SPS and the known limitations are reviewed in the light of the 2012 operational experience. The various SPS upgrades in progress and still under consideration are described, in addition to the machine studies and simulations performed in 2012. The expected machine performance reach is estimated on the basis of the present knowledge, and the remaining decisions that still need to be made concerning upgrade options are detailed.Comment: 3 p. Presented at 4th International Particle Accelerator Conference (IPAC 2013

»Play it again, Sam« – Levels of Complexity in Encoding Performance Personnel

Capturing the personnel needed to perform a musical work in MEI metadata is straightforward with standard ensemble configurations, such as string quartets. In contrast, it can be highly complex for extensive orchestral settings, stage music, or, e.g., twentieth-century ‘Neue Musik.’ Especially in the latter case, the degree of possible variation is virtually limitless. While MEI 4.0.1 offers places within (descendants of , ) for capturing such data and provides means for quite complicated data structures through, e.g., nesting or referencing, there is still room for improvement. First of all, data structures should stay as simple and generic as possible. That is to say, that structural modification and a more detailed description of MEI's data model for the benefit of a more concise encoding should be the target, especially when envisioning a more structured encoding of more complex setups. For example, representing dependencies between performers and instruments is extremely limited in the data model for in MEI 4.0.1 (see definition of and also Gubsch & Ried, 2021). This poster takes as a starting point issues from two edition projects dealing with music from the twentieth century to illustrate philological intricacies and investigate the possibilities to encode them with MEI 4.0.1

Loss of Landau Damping in the LHC

Loss of Landau damping leading to a single bunch longitudinal instability has been observed in the LHC during the ramp and on the 3.5 TeV flat top for small injected longitudinal emittances. The first measurements are in reasonable agreement with the threshold calculated for the expected longitudinal reactive impedance budget of the LHC as well as with the threshold dependence on beam energy. The cure is a controlled longitudinal emittance blow-up during the ramp which for a constant threshold through the cycle should provide an emittance proportional to the square root of energy