There is a gap between single-species model predictions, and empirical studies, regarding the effect of habitat fragmentation per se, i.e., a process involving the breaking apart of habitat without loss of habitat. Empirical works indicate that fragmentation can have positive as well as negative effects, whereas, traditionally, single-species models predict a negative effect of fragmentation. W...

At present, many researchers concentrate on the researches of sink mobility and propose a lot of efficient data harvesting algorithms for wireless sensor networks (WSNs). In general, these algorithms mainly formulate their ideas in two ways, namely path-controllable and path-constrained sink mobility. In most application scenarios of WSNs, mobile sink is path-constrained and a big challenge of ...

There is a gap between single-species model predictions, and empirical studies, regarding the effect of habitat fragmentation per se, i.e., a process involving the breaking apart of habitat without loss of habitat. Empirical works indicate that fragmentation can have positive as well as negative effects, whereas, traditionally, single-species models predict a negative effect of fragmentation. W...

Ecosim models have been fitted to time-series data for a wide variety of ecosystems for which there are long-term data that confirm the models’ ability to reproduce past responses of many species to harvesting. We subject these model ecosystems to a variety of harvest policies, including options based on harvesting each species at its maximum sustainable yield (MSY) fishing rate. We show that w...

1. Introduction: the amount of biological diversity 2. Diversity in ecosystems 2.1. African wildlife systems 2.2. Australian arid grazing systems 3. Measures of biodiversity 3.1. Species richness 3.2. Shortcuts to monitoring biodiversity: indicators, umbrellas, flagships, keystones, and functional groups 4. Biodiversity loss: the great extinction spasm 5. Causes of biodiversity loss: the " evil...

rice is one of the most important staple cereals‏ ‏in iran and has a main role in providing ‎the food ‎security. harvesting by hand postpone the rice harvesting stage, and facing late season ‎rainfall, and increase of yield losses during harvesting. to determine the most suitable ‎harvesting method in gilan, three different harvesting methods (by hand, harvester and ‎combine) were considered as...

DEAR EDITOR Coleman classically described four phases in fat grafting including harvesting, refinement, transfer and placement. The harvesting phase can be simplified by using the “trap device” instead of the conventional 10-cc Luer-Lock syringes. The “trap device” for harvesting fat by Power Assisted Liposuction and Medinorm tank is a convenient, wholly sterile, time saving method to provide f...

Membrane-type acoustic metamaterials are well known for low-frequency sound insulation. In this work, by introducing a flexible piezoelectric patch, we propose sound-insulation metamaterials with the ability of energy harvesting from sound waves. The dual functionality of the metamaterial device has been verified by experimental results, which show an over 20 dB sound transmission loss and a ma...