The remapped particle-mesh advection scheme

We describe the remapped particle-mesh method, a new mass-conserving method for solving the density equation which is suitable for combining with semi-Lagrangian methods for compressible flow applied to numerical weather prediction. In addition to the conservation property, the remapped particle-mesh method is computationally efficient and at least as accurate as current semi-Lagrangian methods based on cubic interpolation. We provide results of tests of the method in the plane, results from incorporating the advection method into a semi-Lagrangian method for the rotating shallow-water equations in planar geometry, and results from extending the method to the surface of a sphere

Attitude ground support system for the solar maximum mission spacecraft

The SMM attitude ground support system (AGSS) supports the acquisition of spacecraft roll attitude reference, performs the in-flight calibration of the attitude sensor complement, supports onboard control autonomy via onboard computer data base updates, and monitors onboard computer (OBC) performance. Initial roll attitude acquisition is accomplished by obtaining a coarse 3 axis attitude estimate from magnetometer and Sun sensor data and subsequently refining it by processing data from the fixed head star trackers. In-flight calibration of the attitude sensor complement is achieved by processing data from a series of slew maneuvers designed to maximize the observability and accuracy of the appropriate alignments and biases. To ensure autonomy of spacecraft operation, the AGSS selects guide stars and computes sensor occultation information for uplink to the OBC. The onboard attitude control performance is monitored on the ground through periodic attitude determination and processing of OBC data in downlink telemetry. In general, the control performance has met mission requirements. However, software and hardware problems have resulted in sporadic attitude reference losses

Recent advances in agroforestry: supporting the transition from conventional to climate-resilient farming

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Weighted cohomology of arithmetic groups

M. Goresky, G. Harder, and R. MacPherson defined weighted cohomologies of arithmetic groups \Gamma in a real group G, with coefficients in certain local systems, associated to arbitrary upper and lower weight profiles. The author shows, using essentially local arguments on the reductive Borel-Serre compactification, that these cohomologies agree with certain weighted L^2 cohomologies defined by J. Franke. When the rank of G is equal to that of a maximal compact subgroup, this implies that the cohomologies associated to both upper and lower middle profiles are both isomorphic to L^2 cohomology.Comment: 32 pages, published version, abstract added in migratio

Using biochar from sewage sludge and other feedstocks in european agroforestry: opportunities and challenges

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Family Life & Life Skills Education for Adolescents: Trivandrum Experience

Adolescence is a period of experimenting, experiencing and expanding. Adolescents need help and guidance in decision-making, problem solving, critical thinking, developing interpersonal skills, self-awareness, empathy, coping with stress and managing emotions. The rebelliousness and dislike for parental intrusion usually keeps parents at bay because teenagers do not relish the idea of help and guidance from parents. However, this may not always be so. Beneath frequent violent outbursts, sudden mood swings and related interpersonal problems of an adolescent, there may be a person crying out for professional help. All adolescents need support and guidance. When parents find it difficult to handle signs of trouble, professional help should be sought at the earliest. Extra care is needed while offering help to adolescents problems because it is not easy for teenagers to accept the fact that they need help. Attempts should be made to understand the adolescent, and to safeguard, protect and guide him/her. The Family Life & Life Skills Education Programme is a good support system for adolescents at the community level