Ride quality systems for commuter aircraft

The state-of-the-art in Active Ride Augmentation, specifically in terms of its feasibility for commuter aircraft applications. A literature survey was done, and the principal results are presented here through discussion of different Ride Quality Augmentation System (RQAS) designs and advances in related technologies. Recommended follow-on research areas are discussed, and a preliminary RQAS configuration for detailed design and development is proposed

Quantum Nondemolition Charge Measurement of a Josephson Qubit

In a qubit system, the measurement operator does not necessarily commute with the qubit Hamiltonian, so that the readout process demolishes (mixes) the qubit energy eigenstates. The readout time is therefore limited by such a mixing time and its fidelity will be reduced. A quantum nondemolition readout scheme is proposed in which the charge of a flux qubit is measured. The measurement operator is shown to commute with the qubit Hamiltonian in the reduced two-level Hilbert space, even though the Hamiltonian contains non-commuting charge and flux terms.Comment: 4 pages, 3 figures, a paragraph added to describe how the scheme works in charge regim

Ab-initio study of the bandgap engineering of Al(1-x)Ga(x)N for optoelectronic applications

A theoretical study of Al(1-x)Ga(x)N, based on full-potential linearized augmented plane wave method, is used to investigate the variations in the bandgap, optical properties and non-linear behavior of the compound with the variation of Ga concentration. It is found that the bandgap decreases with the increase of Ga in Al(1-x)Ga(x)N. A maximum value of 5.5 eV is determined for the bandgap of pure AlN which reaches to minimum value of 3.0 eV when Al is completely replaced by Ga. The static index of refraction and dielectric constant decreases with the increase in bandgap of the material, assigning a high index of refraction to pure GaN when compared to pure AlN. The refractive index drops below 1 for photon energies larger than 14 eV results group velocity of the incident radiation higher than the vacuum velocity of light. This astonishing result shows that at higher energies the optical properties of the material shifts from linear to non-linear. Furthermore, frequency dependent reflectivity and absorption coefficients show that peak value of the absorption coefficient and reflectivity shifts towards lower energy in the UV spectrum with the increase in Ga concentration. This comprehensive theoretical study of the optoelectronic properties of the alloys is presented for the first time which predicts that the material can be effectively used in the optical devices working in the visible and UV spectrum.Comment: 18 pages, 7 figure

Design of a digital ride quality augmentation system for commuter aircraft

Commuter aircraft typically have low wing loadings, and fly at low altitudes, and so they are susceptible to undesirable accelerations caused by random atmospheric turbulence. Larger commercial aircraft typically have higher wing loadings and fly at altitudes where the turbulence level is lower, and so they provide smoother rides. This project was initiated based on the goal of making the ride of the commuter aircraft as smooth as the ride experienced on the major commercial airliners. The objectives of this project were to design a digital, longitudinal mode ride quality augmentation system (RQAS) for a commuter aircraft, and to investigate the effect of selected parameters on those designs

Systematic Topology Analysis and Generation Using Degree Correlations

We present a new, systematic approach for analyzing network topologies. We first introduce the dK-series of probability distributions specifying all degree correlations within d-sized subgraphs of a given graph G. Increasing values of d capture progressively more properties of G at the cost of more complex representation of the probability distribution. Using this series, we can quantitatively measure the distance between two graphs and construct random graphs that accurately reproduce virtually all metrics proposed in the literature. The nature of the dK-series implies that it will also capture any future metrics that may be proposed. Using our approach, we construct graphs for d=0,1,2,3 and demonstrate that these graphs reproduce, with increasing accuracy, important properties of measured and modeled Internet topologies. We find that the d=2 case is sufficient for most practical purposes, while d=3 essentially reconstructs the Internet AS- and router-level topologies exactly. We hope that a systematic method to analyze and synthesize topologies offers a significant improvement to the set of tools available to network topology and protocol researchers.Comment: Final versio

Theory of pinning in a Superconducting Thin Film Pierced by a Ferromagnetic Columnar Defect

This is an analytical study of pinning and spontaneous vortex phase is a system consisting of a superconducting thin film pierced by a long ferromagnetic columnar defect of finite radius $R$. The magnetic fields, screening currents, energy and pinning forces for this system are calculated. The interaction between the magnetic field of vortices and the magnetization outside the plane of the film and its close proximity enhances vortex pinning significantly. Spontaneous vortex phase appears when the magnetization of the columnar defect is increased above a critical value. Transitions between phases characterized by different number of flux quanta are also studied. These results are generalized to the case when the superconductor is pierced by an array of columnar defects.Comment: 6 pages, 4 figures, Accepted for publication in Phys. Rev.

Pengembangan Modul Evolusi Dengan Pendekatan Saintifik Menggunakan Model Think, Talk, Write (Ttw) Di SMA

The learning materials of evolutionary in biology for students of class XII IPA SMAN I Glenmore Banyuwangi is still in obstacles. The materials in textbooks based on School Based of Curriculum (KTSP), while teachers should teach the scientific approach which refers to curriculum of 2013. The requirement analysis of evolutionary teachers stated that 86% of teachers requires learning modules for students. The analysis of the mastery learning of students in the last three years of study showed that the level of student mastery of less than 35%. The purpose of this research is to develop modules of evolution for students with scientific approach using model Think, Talk, Write in SMAN I Glenmore Banyuwangi. The module was developed based on the model of the research and development of Dick & Carey (2001), which consists of nine stages of development. The validation results of learning experts showed very valid category with the percentage of votes <p> 90.77% to the syllabus and <p> 91.04% to RPP. The validation results of study design experts showed very valid category with the percentage of votes <p> 98.57% to the module. The validation results of material experts showed a valid category with the percentage of votes <p> 82.33% to the module for students. The validation results by implementing learning practitioners in the field showed very valid category with the percentage of votes <p> 100% to the syllabus, <p> 93.08% to RPP, and <p> 97.25% to module for students. The test results by the legibility of small groups of students showed very valid category with the percentage of votes <p> by 86.78%. to modul. Based on the validation results, we can conclude that the evolution module with the scientific approach using Think, Talk, Write models earmarked for students is valid and is expected to meet the limitations on teaching materials that are already available.Pembelajaran biologi materi evolusi bagi peserta didik kelas XII IPA SMAN I Glenmore Kabupaten Banyuwangi mengalami kendala. Bahan ajar yang ada masih mengacu pada buku paket dalam Kurikulum Tingkat Satuan Pendidikan (KTSP), sedangkan guru harus mengajar dengan pendekatan saintifik yang mengacu pada kurikulum 2013. Analisis kebutuhan guru menyatakan bahwa 86% guru pengampu pelajaran biologi materi evolusi memerlukan modul pembelajaran bagi peserta didik. Analisis kebutuhan peserta didik dalam tiga tahun pembelajaran terakhir menunjukkan bahwa tingkat ketuntasan peserta didik kurang dari 35%. Tujuan dari penelitian ini adalah untuk mengembangkan modul evolusi bagi peserta didik dengan pendekatan saintifik menggunakan model Think, Talk, Write di SMAN I Glenmore Kabupaten Banyuwangi. Modul dikembangkan berdasarkan model pengembangan Dick & Carey (2001) yang terdiri dari sembilan tahap pengembangan. Analisis hasil validasi ahli perangkat pembelajaran menunjukkan kategori sangat valid dengan hasil persentase penilaian <p> sebesar 90,77% untuk silabus dan <p> sebesar 91,04% untuk RPP. Analisis hasil validasi ahli desain pembelajaran menunjukkan kategori sangat valid dengan hasil persentase penilaian <p> sebesar 98,57% untuk modul. Analisis hasil validasi ahli materi menunjukkan kategori valid dengan hasil persentase penilaian <p> sebesar 82,33% untuk modul peserta didik. Analisis hasil validasi oleh praktisi pelaksana pembelajaran di lapangan menunjukkan kategori sangat valid dengan hasil persentase penilaian <p> sebesar 100% untuk silabus, <p> sebesar 93,08% untuk RPP, dan <p> sebesar 97,25% untuk modul peserta didik. Analisis hasil uji coba keterbacaan kelompok kecil oleh peserta didik menunjukkan kategori sangat valid dengan hasil persentase penilaian <p> sebesar 86,78% untuk modul. Berdasarkan hasil validasi tersebut dapat disimpulkan bahwa modul evolusi dengan pendekatan saintifik menggunakan model Think, Talk, Write yang diperuntukkan bagi peserta didik valid dan diharapkan mampu memenuhi keterbatasan pada bahan ajar yang sudah tersedia

Thermally assisted adiabatic quantum computation

We study the effect of a thermal environment on adiabatic quantum computation using the Bloch-Redfield formalism. We show that in certain cases the environment can enhance the performance in two different ways: (i) by introducing a time scale for thermal mixing near the anticrossing that is smaller than the adiabatic time scale, and (ii) by relaxation after the anticrossing. The former can enhance the scaling of computation when the environment is superohmic, while the latter can only provide a prefactor enhancement. We apply our method to the case of adiabatic Grover search and show that performance better than classical is possible with a superohmic environment, with no a priori knowledge of the energy spectrum.Comment: 4 pages, 2 figures, Final version to appear in PR

Stationary Josephson effect in a weak-link between nonunitary triplet superconductors

A stationary Josephson effect in a weak-link between misorientated nonunitary triplet superconductors is investigated theoretically. The non-self-consistent quasiclassical Eilenberger equation for this system has been solved analytically. As an application of this analytical calculation, the current-phase diagrams are plotted for the junction between two nonunitary bipolar $f-$wave superconducting banks. A spontaneous current parallel to the interface between superconductors has been observed. Also, the effect of misorientation between crystals on the Josephson and spontaneous currents is studied. Such experimental investigations of the current-phase diagrams can be used to test the pairing symmetry in the above-mentioned superconductors.Comment: 6 pages and 6 figure