The impact of human activities on ecosystems is receiving increasing attention because their mechanisms action are complex; the spatial response ecosystem service drivers still needs to be explored further. This study evaluated three services—water yield, soil conservation, and carbon storage—in Hainan Province from 2000 2020; we analyzed temporal changes services, heterogeneity influencing fac...

French government has launch in 2000 a public debate about conservation of data and electronic documents. Due to the widespread use of Internet and extranet technologies, especially with electronic document exchange, we had have to adapt the politic of document conservation to this new challenge: “avoid the lack of memory in public administration”. A guide-book was produced. This guide-book is ...

Soil conservation is the only known way to protect the productive land. In country like Ethiopia, where droughts and floods cause food scarcity problem, soil and water conservation not only increases crop yield, but also prevents further deterioration of land. Soil and water conservation preserve soil moisture and drain water sustainably to avoid soil erosion and depletion of soil nutrients. So...

1339 Soil Sci. Soc. Am. J. 74:1339–1347 Published online 2 June 2010 doi:10.2136/sssaj2009.0280 Received 29 July 2009. *Corresponding author ([email protected]). © Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocop...

1763 Soil Sci. Soc. Am. J. 74:1763–1774 Published online 4 Aug. 2010 doi:10.2136/sssaj2010.0056 Received 31 Jan. 2010. *Corresponding author ([email protected]. © Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, re...

In this talk we present a joint work with Feng-Bin Wang and Xiaoqiang Zhao. The work concerns with a periodically pulsed bio-reactor model of a flowing water habitat with a hydraulic storage zone in which no flow occurs. The full system can be reduced to a limiting system based on a conservation principle. Then we obtain sufficient conditions in terms of principal eigenvalues for the persistenc...

The paper proposes a neurocomputing approach for numerical solving of a hyperbolic partial differential equation (PDE) arising from a system of conservation laws. The main idea is to combine the method of lines (transforming the mixed initial boundary value problem for PDE into a high dimensional system of ordinary differential equations (ODEs)) with a cellular neural network (CNN) optimal stru...

A controllable distributed dynamical system described by a system of linear constant-coeecient partial diierential equations is said to be conservative if for compact support trajectories the integral of the supply rate is zero. It is said to be dissipative if this integral is non-negative. The question that we consider is whether these global versions of conservation and dissipativeness are eq...

Cellular studies of implicit and explicit memory suggest that experience-dependent modulation of synaptic strength and structure is a fundamental mechanism by which these memories are encoded, processed, and stored within the brain. In this review, we focus on recent advances in our understanding of the molecular mechanisms that underlie short-term, intermediate-term, and long-term forms of imp...

Australia is rich in orchid flora with over 1000 native species currently recorded. A significant proportion of Australia’s terrestrial orchids are critically endangered, endangered or threatened. Threats to many orchid species include habitat destruction, degradation and fragmentation from increased urbanisation, overgrazing, altered fire regimes and unfortunately, excessive collecting by orch...