Evaluation of scanning earth sensor mechanism on engineering test satellite 4

The results of the analysis and the evaluation of flight data obtained from the horizon sensor test project are described. The rotary mechanism of the scanning earth sensor composed of direct drive motor and bearings using solid lubricant is operated satisfactorily. The transmitted flight data from Engineering Test Satellite IV was evaluated in comparison with the design value

A perception and manipulation system for collecting rock samples

An important part of a planetary exploration mission is to collect and analyze surface samples. As part of the Carnegie Mellon University Ambler Project, researchers are investigating techniques for collecting samples using a robot arm and a range sensor. The aim of this work is to make the sample collection operation fully autonomous. Described here are the components of the experimental system, including a perception module that extracts objects of interest from range images and produces models of their shapes, and a manipulation module that enables the system to pick up the objects identified by the perception module. The system was tested on a small testbed using natural terrain

Effect of cation size variance on spin and orbital order in Eu1−x_{1-x}(La0.254_{0.254}Y0.746_{0.746})x_{x}VO3_3

We have investigated the $R$-ion ($R$ = rare earth or Y) size variance effect on spin/orbital order in Eu$_{1-x}$(La$_{0.254}$Y$_{0.746}$)$_{x}$VO$_3$. The size variance disturbs one-dimensional orbital correlation in $C$-type spin/$G$-type orbital ordered states and suppresses this spin/orbital order. In contrast, it stabilizes the other spin/orbital order. The results of neutron and resonant X-ray scattering denote that in the other ordered phase, the spin/orbital patterns are $G$-type/$C$-type, respectively.Comment: 4 pages, 4 figures, accepted to Rapid Communication in Physical Review

Charge excitations associated with charge stripe order in the 214-type nickelate and superconducting cuprate

Charge excitations were studied for stipe-ordered 214 compounds, La$_{5/3}$Sr$_{1/3}$NiO$_{4}$ and 1/8-doped La$_{2}$(Ba, Sr)$_{x}$CuO$_{4}$ using resonant inelastic x-ray scattering in hard x-ray regime. We have observed charge excitations at the energy transfer of 1 eV with the momentum transfer corresponding to the charge stripe spatial period both for the diagonal (nikelate) and parallel (cuprates) stripes. These new excitations can be interpreted as a collective stripe excitation or charge excitonic mode to a stripe-related in-gap state.Comment: 5 pages, 4 figure

Polarization-analyzed resonant inelastic x-ray scattering of the orbital excitations in KCuF3

We report a Cu K-edge resonant inelastic x-ray scattering (RIXS) study of orbital excitations in KCuF3 . By performing the polarization analysis of the scattered photons, we disclose that the excitation between the eg orbitals and the excitations from t2g to eg exhibit distinct polarization dependence. The polarization dependence of the respective excitations is interpreted based on a phenomenological consideration of the symmetry of the RIXS process that yields a necessary condition for observing the excitations. In addition, we show that the orbital excitations are dispersionless within our experimental resolution.Comment: 5 pages, 3 figure

Why Librarianship? A Comparative Study Between University of Tsukuba, University of Hong Kong, University of British Columbia and Shanghai University

Career decisions are motivated in part by our internal values, but also are influenced strongly by innumerable external forces perceived in the context of our lives. In the research reported here, we explore various social, cultural, economic, and educational factors, as well as personal and professional reasons that influence students in choosing library and information science professions as a career. Master of Library and Information Science (MLIS) students from four universities located in four different regions were invited to take part in an online questionnaire survey. The universities were Shanghai University (SHU), the University of British Columbia (UBC), the University of Hong Kong (HKU) and the University of Tsukuba (UT). 175 self-completed questionnaires were collected in total. Survey results indicated that students enrolled in MLIS programmes were predominately female. Differences and similarities were encountered for the different sites. For example HKU and UBC had the largest number of students with graduate-level qualifications prior to entering the MLIS programme and students at HKU and UBC tended to vary widely in terms of their educational and occupational backgrounds. For the majority of the HKU and UBC respondents, the decision to obtain a professional qualification in LIS was driven by the desire to maximize the benefits of a career change or for career advancement, while the majority of respondents at the UT and SHU did not already have a job or much working experience. While the total surveyed populations are small; the study will be of interest and value to LIS educators and administrators responsible for recruiting MLIS graduates and hiring LIS professions.postprin