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Wyszukujesz frazę "Jackson, R." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
Shale gas development: managing economic transitions
Autorzy:
Jackson, R.
Powiązania:
https://bibliotekanauki.pl/articles/298994.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
shale gas
Opis:
Shifts in populations and economic structure are as old as population settlements themselves. As technologies change and economies adapt, regional comparative advantages also evolve. Among the most consequential of recently developed new technologies is horizontal drilling, which has opened vast regions of the world to the extraction, development,and use of low-cost energy from shale gas. Economic transitions and structural change are inevitable. The challenge for regional economists, policymakers, and economic developers lies in the identifying and managing these transitions in ways that maximize benefits and minimize the costs that accompany them. Complicating this challenge is the recognition that the geographic distributions of costs and benefits of economic development often do not coincide. This spatial mismatch of costs and benefits has been prominent historically in regional resource boom and bust cycles, many of which have been fed specifically by energy resources. The resources of energy rich regions have often been exploited in ways that provide short- term regional economic benefits and disruption, longer-term economic development often accompanied by environmental and physical infrastructural degradation. Recognizing that we are entering the early stages of one of the most substantial resource based shifts in economic structure in the history of energy resource development, we have the opportunity and the obligation to learn from successes and failures ofprevious economic transition management efforts, and to design strategies that will maximize the benefits and minimize the negative consequences of shale gas development. This contribution identifies and elaborates upon four critical dimensions of the transition management challenge. The first dimension includes the economic and environmental aspects of the extraction activities including drilling, materials assembly and usage including employment, income, capital equipment, and consumables, both manufactured and natural. The second dimension identifies the negative externalities of impacts on off-site physical infrastructure, with a special emphasis on transport infrastructure. In attempting to minimize negative consequences, programs should be developed to leave affected areas no worse off, at worst, and better off if possible. The road network involved in support drilling can extend well beyond the obvious transport arteries, even to jurisdictions that are not direct beneficiaries of severance taxes or impacts fees. The third dimension centers on economic structural changes related to upstream and downstream activities in the production and supply chains, and the fourth dimension concerns the roles of and impacts upon social and institutional structures.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 1; 317-318
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of Intrinsic Defects in CaYAl₃O₇
Autorzy:
da C. Bispo, G.
Jackson, R.
Valerio, M.
Powiązania:
https://bibliotekanauki.pl/articles/1029677.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Bn
61.72.-y
34.20.Cf
Opis:
CaYAl₃O₇ presents a challenge for computer modelling techniques because of its site-occupancy disorder related to the Ca/Y shared site. Supercells were built to reproduce experimental results which have the best agreement and lowest lattice energy. The potential parameters were obtained by empirical fitting, and reproduced the structure to within 1.09%. Results obtained by supercell and the Mott-Littleton methods were compared. Both methods predict oxygen Frenkel defects are likely to be formed.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 781-784
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The potential of alternative rail freight transport corridors between Central Europe and China
Potencjał alternatywnych kanałów kolejowego transportu towarowego pomiędzy Centralną Europą i Chinami
Autorzy:
Islam, D.
Zunder, T.
Jackson, R.
Nesterova, N.
Burgess, A.
Powiązania:
https://bibliotekanauki.pl/articles/375224.pdf
Data publikacji:
2013
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
rail freight
Europe - China
alternative corridors
Trans-Sib
przewozy kolejowe
Europa-Chiny
alternatywne korytarze
Opis:
The paper examines the potential of three rail corridors: Trans-Sib, Central and TRACECA for freight transport between Central Europe and China. The paper applies a qualitative research method including a review of current literature and interviews. The research examines the technical, operational and bureaucratic conditions of the corridors. The research finds that the unreliable transit time, higher cost and damage and theft of cargo are the most pressing barriers to towards offering an efficient and integrated logistics and supply chain service along the corridors. This is due to, amongst others, problematic, multiple border-crossings and the lack of visible cooperation among the countries. The technical and operational barriers include a change of gauge, differing power supply and signalling systems and non-automated and fragmented information systems. The research also finds that the Trans-Sib is the most attractive corridor currently running and shows promise with the active contribution from the Russian government and relevant direct stakeholders such as Russian Railway (RZD). The TRACECA route is the most problematic option due to, among others, numerous border-crossings, infrastructure and rolling stock constraints and other associated problems.
Artykuł bada potencjał trzech kanałów kolejowych: Trans-Syberyjskiego, Centralnego oraz TRACECA dla transportu towarów pomiędzy Centralną Europą a Chinami. Artykuł stosuje badania jakościowe łącznie z przeglądem aktualnej literatury i wywiadami. Praca badawcza rozpatruje techniczne, operacyjne oraz biurokratyczne warunki oraz korytarze. Praca badawcza odkrywa, iż niewiarygodne czasy tranzytu, wyższe koszty i zniszczenia oraz kradzieże towarów są najbardziej naglącymi barierami do przejścia przy użyciu efektywnego oraz logistycznie zintegrowanego serwisu łańcucha dostaw wzdłuż korytarzy. Jest to spowodowane między innymi, problematycznością, przymusem pokonywania wielu granic międzynarodowych oraz brakiem widocznej współpracy pomiędzy państwami. Techniczne i operacyjne bariery zawierają zmianę szerokości, zróżnicowanie mocy zasilającej i systemów sygnalizacji oraz nieautomatyczne i rozproszone systemy informatyczne. Paca również przedstawia, iż trasa Trans-Syberyjska jest najbardziej atrakcyjnym korytarzem biegnącym obecnie i dającym nadzieję przy czynnym udziale Rosyjskiego Rządu i odpowiednich podmiotów bezpośrednich takich jak Rosyjska Kolej (RZD). Trasa TRACECA jest najbardziej problematyczna opcją, pomiędzy innymi, spowodowane jest to koniecznością wielokrotnego przekraczania granic, infrastrukturą i ciągłymi ograniczeniami zasobów i innymi powiązanymi problemami.
Źródło:
Transport Problems; 2013, 8, 4; 45-57
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some complexity results in topology and analysis
Autorzy:
Jackson, Steve
Mauldin, R.
Powiązania:
https://bibliotekanauki.pl/articles/1215022.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
cantor manifold
dimensional kernel
projective set
countably continuous
upper semicontinuous
Opis:
If X is a compact metric space of dimension n, then K(X), the n- dimensional kernel of X, is the union of all n-dimensional Cantor manifolds in X. Aleksandrov raised the problem of what the descriptive complexity of K(X) could be. A straightforward analysis shows that if X is an n-dimensional complete separable metric space, then K(X) is a $Σ_2^1$ or PCA set. We show (a) there is an n-dimensional continuum X in $ℝ^n+1$ for which K(X) is a complete $Π_1^1$ set. In particular, $K(X) ∈ Π_1^1-Σ_1^1$; K(X) is coanalytic but is not an analytic set and (b) there is an n-dimensional continuum X in $ℝ^n+2$ for which K(X) is a complete $Σ_2^1$ set. In particular, $K(X) ∈ Σ_2^1-Π_2^1$; K(X) is PCA, but not CPCA. It is also shown the Lebesgue measure as a function on the closed subsets of [0,1] is an explicit example of an upper semicontinuous function which is not countably continuous.
Źródło:
Fundamenta Mathematicae; 1992, 141, 1; 75-83
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A preliminary note of egg-case oviparity in a Devonian placoderm fish
Autorzy:
Carr, R. K.
Jackson, G.
Powiązania:
https://bibliotekanauki.pl/articles/139073.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Devonian
Famennian
Cleveland Shale
Ohio
USA
Placodermi
Arthrodira
oviparity
egg case
Chondrichthyes
dewon
famen
ryby pancerne
tarczowce
plakodermy
zawiasowce
jajorodność
ryby chrzęstnoszkieletowe
ryby chrzęstne
chrzęstniki
Opis:
Six enigmatic fossils from the Famennian (Devonian) Cleveland Shale in Ohio, U.S.A., are interpreted here as arthrodiran (Placodermi) egg cases. Recognition as egg cases is confirmed based on the observation of layered collagen fibers. The presence of a tuberculated bone fragment preserved within one case confirms a vertebrate source. The nature of the tubercles and the unique morphology of the egg cases supports the interpretation of an arthrodiran source. Reports of Devonian egg cases are limited to either assumed chondrichthyan producers or a putative ‘egg sac’ with a morphology atypical for any vertebrate. The Cleveland Shale egg cases thus represent the first record for a non-chondrichthyan producer. Among placoderms, behaviors of a pelagic life style with obligate nesting sites, reef fishes with live birth, and estuarine and fluvial nurseries, along with eggcase oviparity testifies to the diversity of reproductive strategies. As with modern fishes these strategies may be ecologically driven and the derived and variable reproductive biology of extant chondrichthyans is actually a primitive condition among gnathostomes. One consequence of the diversity of reproductive strategies (dependent on the topology of relationships) is the independent origin of internal fertilization within placoderms, possibly suggesting external fertilization as the primitive gnathostome reproductive mode.
Źródło:
Acta Geologica Polonica; 2018, 68, 3; 381-389
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On infinite partitions of lines and space
Autorzy:
Erdös, Paul
Jackson, Steve
Mauldin, R.
Powiązania:
https://bibliotekanauki.pl/articles/1205459.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
transfinite recursion
Martin's Axiom
forcing
geometry
infinite partitions
Opis:
Given a partition P:L → ω of the lines in $ℝ^n$, n ≥ 2, into countably many pieces, we ask if it is possible to find a partition of the points, $Q:ℝ^n → ω$, so that each line meets at most m points of its color. Assuming Martin's Axiom, we show this is the case for m ≥ 3. We reduce the problem for m = 2 to a purely finitary geometry problem. Although we have established a very similar, but somewhat simpler, version of the geometry conjecture, we leave the general problem open. We consider also various generalizations of these results, including to higher dimension spaces and planes.
Źródło:
Fundamenta Mathematicae; 1997, 152, 1; 75-95
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On partitions of lines and space
Autorzy:
Erdös, Paul
Jackson, Steve
Mauldin, R.
Powiązania:
https://bibliotekanauki.pl/articles/1208480.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
transfinite recursion
Opis:
We consider a set, L, of lines in $ℝ^n$ and a partition of L into some number of sets: $L = L_1∪...∪ L_p$. We seek a corresponding partition $ℝ^n = S_1 ∪...∪ S_p$ such that each line l in $L_i$ meets the set $S_i$ in a set whose cardinality has some fixed bound, $ω_τ$. We determine equivalences between the bounds on the size of the continuum, $2^ω ≤ ω_θ$, and some relationships between p, $ω_τ$ and $ω_θ$.
Źródło:
Fundamenta Mathematicae; 1994, 145, 2; 101-119
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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