We present an access method for timeslice queries that reconstructs a past state s(t) of a time-evolving collection of objects, in O(log,, n + Is(t)l/b) I/O ‘8, where Is(t)1 denotes the size of the collection at time t, n is the total number of changes in the collection’s evolution and b is the size of an I/O transfer. Changes include the addition, deletion or attribute modification of objects;...

BACKGROUND The prevalence of different biotic processes (limiting similarity, weaker competitor exclusion) and historical contingency due to priority effects are in the focus of ongoing discussions about community assembly and non-random functional trait distributions. METHODOLOGY/PRINCIPAL FINDINGS We experimentally manipulated assembly history in a grassland biodiversity experiment (Jena Ex...

Scope The autonomous navigation in agricultural environments allows also to carry out autonomous operations of special interest in agriculture environments. The goal of an autonomous navigation is to cover all the required areas where the operation has to be made. We take into account different navigation strategies using proper sensors being also able to detect references which makes possible ...

1.17 The drudgery of weeding is so ingrained into the lives of farmers in developing countries that weeds are taken for granted and often overlooked in pest surveys. And yet weeding by hand, typically carried out by women and children, accounts for 50% of the total labour inputs needed to produce a crop, deprives millions of children the joys of playtime – and often schooling – and adds to the ...

An n-dimensional chair consists of an n-dimensional box from which a smaller n-dimensional box is removed. A tiling of an n-dimensional chair has two nice applications in some memories using asymmetric codes. The first one is in the design of codes which correct asymmetric errors with limited-magnitude. The second one is in the design of n cells q-ary write-once memory codes. We show an equival...

We propose a tamper-evident storage system based on probe storage with a patterned magnetic medium. This medium supports normal read/write operations by outof-plane magnetisation of individual magnetic dots. We report on measurements showing that in principle the medium also supports a separate class of write-once operation that destroys the out-of-plane magnetisation property of the dots irrev...

The weeding project at Southeast Missouri State University presented an opportunity to identify different variables, i.e. shelf level, book jackets, added entries, and untraced series, that impacted a book’s circulation behavior and to consider the relationship between circulation and the Internet/online database activity. Using the political science collection, the investigator found that shel...