Im vielen Umfeldern wird in zunehmendem Maße gefordert, für Produkte nicht nur bei Projektabschluss, sondern über deren gesamte Lebensdauer hinweg ihre Kompatibilität mit den Anforderungen zu gewährleisten. Requirements Engineering (RE) ist in solchen Umfeldern als ein integraler Bestandteil des Product Lifecycle Managements (PLM) zu realisieren. Der Beitrag stellt einige Konzepte des PLM vor u...

Although increasing efforts are being made to restore tropical forests, little information is available regarding the time scales required for carbon and plant biodiversity to recover to the values associated with undisturbed forests. To address this knowledge gap, we carried out a meta-analysis comparing data from more than 600 secondary tropical forest sites with nearby undisturbed reference ...

High-performance ion chromatography (HPIC) has been widely used for oxalate analysis and, more recently, for glycolate analysis. We describe a procedure for sample preparation in which the plasma ultrafiltrate is acidified during harvesting with a cation-exchange resin, and the chloride is removed before the ion chromatography, which is performed with a newly developed AS10 column. The same ult...

Plant biomass is an important factor for determining arid and semi-aridrangelands capacity. Due to the lack of proper and annual sampling of rangelands, there areno suitable data to determine biomass, range condition and proper range managementoperations. Plant biomass is one of the measurable attributes that can be assessed inrangeland studies. Since the clip and weight method is destructive a...

Evaluation of range conditions and plant diversity circumstances can help to rangeland managers who establish their managerial approaches on the basis of ecological capabilities of rangeland ecosystems. Hence, surveying of rangelands was done in four sites of northern Alborz Mt. including western Alborz (Masooleh site), west to middle Alborz (Javaherdeh site), central area (Polour site), and ea...