Non-ferrous metals mining activities have long accompanied people, and began in the study area of South East Europe over 2000 years ago. The environment quality is significantly affected by both ...historic mining activities and contemporary impacts. All these problems, inducing synergic negative effects on local organism communities, have created a chronic state of pollution. The Corna Valley has one of the oldest historical human impacts in Romania due to the influence of mining. Fish and benthic macroinvertebrates have exhibited significant responses to long term mining effects on lotic systems. The analysis of macroinvertebrate communities, correlated with the lack of fish and some biotope characteristics, indicates that the Corna River presents a variety of categories of ecological status between sectors. The lack of fish reveals the poor ecological conditions. Technical and management solutions are proposed here to diminish the historical environmental problems and to avoid future ecological accidents, especially in an attempt to improve any construction plan concerning a possible new de-cyanidation dam and lake. Fish and benthic macroinvertebrates have exhibited significant responses to long term mining effects on lotic systems. Two management zones were identified, an upper zone which can be used as a reference area and a lower zone, where pollution remedial activities are proposed.
In 1998, Conway and Yang wrote a paper (Holomorphic spaces, MSRI Publications, vol 33, pp 201–209,
1998
) in which they posed a number of open questions regarding the shift on
P
t
(
μ
)
spaces. A few ...of these have been completely resolved, while at least one remains wide open. In this paper, we review some of the solutions, mention some alternate approaches and discuss further the problem that remains unsolved.
Let
be a univalent (analytic) mapping from the unit disk
into itself. Under a certain regularity condition on the bundary of
, we show that the composition operator
is compact on the Hardy space
if ...and only if
We give an elementary and direct proof of the identity:lim sup|w|→1−Nψ(w)1−|w|=lim sup|a|→1−(1−|a|2)‖1/(1−a¯ψ)‖H22, for any analytic self-map ψ of {z:|z|<1}; where Nψ denotes the Nevanlinna counting ...function of ψ. We further show that one can find analytic self-maps ψ of {z:|z|<1}, where the composition operator Cψ on the Hardy space H2 is compact, such that ‖ψn‖H2 tends to zero at an arbitrarily slow rate, as n→∞; even in the case that ψ is univalent. Among these are new examples, where Cψ is compact on H2, but not in any of the Schatten classes.
We modify an idea in an earlier paper to enlarge the collection of inner functions that are known to be in the uniform closure of the indestructible Blaschke products.
Let
φ
be an analytic mapping from the unit disk
D
:
=
{
z
:
|
z
|
<
1
}
to itself. In the context of Banach spaces of analytic functions on
D
, we address the question: Does closed-rangedness of the ...composition operator
C
φ
on one space confer closed-rangedness of
C
φ
on a smaller space? We find that the answer is quite often in the affirmative and provide conditions that guarantee this. We also show that, in the absence of these conditions, the answer is not always in the affirmative.
En This paper reviews the current use of ebooks in elearning environments looking especially at the development of ereaders such as the Amazon kindle and the Ipad. It details the problems involved ...and argues that the emerging epub3 standard will be capable of resolving these concerns. Finally different eBook sales models are listed and the impact on institutions addressed. It Questo lavoro prende in esame l’uso degli e-book nell’ambiente dell’e-learning e guarda specificatamente allo sviluppo degli e-readers quali Amazon Kindle e Ipad. Affronta in modo dettagliato i problemi connessi al loro utilizzo e sostiene che lo standard emergente epub3 sara’ capace di risolvere queste problematiche. Inoltre vengono indicati diversi modelli di vendita degli ebook e l’impatto che questi possono avere sulle Istituzioni cui si rivolgono., This paper reviews the current use of ebooks in elearning environments looking especially at the development of ereaders such as the Amazon kindle and the Ipad. It details the problems involved and argues that the emerging epub3 standard will be capable of resolving these concerns. Finally different eBook sales models are listed and the impact on institutions addressed., Questo lavoro prende in esame l’uso degli e-book nell’ambiente dell’e-learning e guarda specificatamente allo sviluppo degli e-readers quali Amazon Kindle e Ipad. Affronta in modo dettagliato i problemi connessi al loro utilizzo e sostiene che lo standard emergente epub3 sara’ capace di risolvere queste problematiche. Inoltre vengono indicati diversi modelli di vendita degli ebook e l’impatto che questi possono avere sulle Istituzioni cui si rivolgono.
Transylvania: Nature and Tradition in Transition Akeroyd, John R
Bulletin of the Transilvania University of Brașov. Series IV, Philology, cultural studies,
02/2023, Letnik:
15, Številka:
Suppl
Journal Article
Odprti dostop
The rich ecological and cultural heritage of Transylvania has survived despite a once depressed rural economy, a situation markedly improved after Romania’s EU accession in 2007. The last decade has ...seen accelerated change in the farmed landscape, with agricultural, conservation and rural development initiatives, a more prosperous society, and growing public awareness of the environment. In the Saxon Villages, as elsewhere, these trends present opportunities and challenges to local people and biodiversity. Positive change in the countryside includes more eco-tourism, guest houses and traditional food products. Expanding beef rather than dairy cattle herds may present both environmental threat and economic opportunity.
Beef cattle may offer a more profitable option and a benign grazing regime. Since March 2018 Fundaţia ADEPT has managed a 60-strong Aberdeen Angus beef herd in 240 ha of Angofa valley, 5 km south of ...the historic town of Sighișoara, to restore grassland degraded by 15 years of sheep grazing. Concerns about greenhouse gas emissions from beef production rarely distinguish between beef raised on permanent pasture and that relying on inputs linked to intensive arable farming, imported feed or rainforest clearance. The soil of permanent pastures, especially when extensively grazed by domestic or wild herbivores, can reduce net carbon (CO2, CH4) emissions by > 90% or even sequester more CO2 than emitted. Since 2017 removal of sheep in Angofa valley, combined with cattle grazing, has allowed restitution of pastures and other habitats.
PDF
