We introduce the successive Hitting Set model, where the set system is not given in advance but a set generator produces the sets that contain a specific element from the universe on demand. Despite incomplete knowledge about the set system, we show that several approximation algorithms for the conventional Hitting Set problem can be adopted to perform well in this model. We describe, and exper...

We study a geometric hitting set problem involving unirectional rays and curves in the plane. We show that this problem is hard to approximate within a logarithmic factor even when the curves are convex polygonal x-monotone chains. Additionally, it is hard to approximate within a factor of 76 even when the curves are line segments with bounded slopes. Lastly, we demonstrate that the problem is ...

The prevalent formation of noncrystalline U(IV) species in the subsurface and their enhanced susceptibility to reoxidation and remobilization, as compared to crystalline uraninite, raise concerns about the long-term sustainability of the bioremediation of U-contaminated sites. The main goal of this study was to resolve the remaining uncertainty concerning the formation mechanism of noncrystalli...

Recovery of coral reefs after physical damage sustained from storm events can be affected by various factors. Here, we examined the initial recovery a reef at southern end uninhabited Lalo Atoll Papahānaumokuākea Marine National Monument its complete destruction Hurricane Walaka in 2018. While site was still mostly (98%) covered mixture rubble and sand, surveys utilizing underwater photogrammet...

Cacao ( Theobroma cacao ) is a commodity that plays an important role in supporting economic and social development. However, production can also be major contributor to carbon emissions, which has stimulated various efforts toward sustainable farm management. There remains gap knowledge regarding the links between stocks footprints, serve as indicators of environment “friendliness.” In this st...

Ellenberg indicator values for plant species are widely used metrics in ecology, providing a proxy measure of environmental conditions, without direct measurements. They integrate conditions over time since will only persist where favourable. moisture (F) summarise the hydrological environment experienced by plants. However, relationship between and appears to be influenced range other abiotic ...

Vegetation recovery in old fields towards mature reference states is often limited by abiotic and biotic thresholds resulting from agricultural land use legacies, as commonly highlighted using state transition models. Old-field restoration may include interventions (e.g. planting of vegetation) to overcome these assist between states. However, our understanding the effectiveness limited. Using ...

Human-induced disturbance has substantially influenced the structure and function of terrestrial ecosystems globally. However, extent to which multiple ecosystem functions (multifunctionality) recover following anthropogenic (ecosystem recovery) remains poorly understood. We report on first study examining temporal dynamics in recovery multifunctionality from 3 12 years after commencement rehab...