5,310 research outputs found
On Kapteyn-Kummer Series' Integral Form
In this short research note we obtain double definite integral expressions
for the Kapteyn type series built by Kummer's (or confluent hypergeometric
) functions. These kind of series unify in natural way the similar
fashion results for Neumann-, Schl\"omilch- and Kapteyn-Bessel series recently
established by Pog\'any, S\"uli, Baricz and Jankov Ma\v{s}irevi\'c
Bioassay-guided isolation and identification of antimicrobial compounds from thyme essential oil by means of overpressured layer chromatography, bioautography and GC-MS
A simple method is described for efficient isolation of compounds having an antibacterial effect.
Two thyme (Thymus vulgaris) essential oils, obtained from the market, were chosen as
prospective materials likely to feature several bioactive components when examined by thin layer
chromatography coupled with direct bioautography as a screening method. The newly developed
infusion overpressured layer chromatographic separation method coupled with direct
bioautography assured that only the active components were isolated by means of overrun
overpressured layer chromatography with online detection and fractionation. Each of the 5
collected fractions represented one of the five antimicrobial essential oil components designated
at the screening. The purity and the activity of the fractions were confirmed with chromatography
coupled various detection methods (UV, vanillin-sulphuric acid reagent, direct bioautography).
The antibacterial components were identified with GC-MS as thymol, carvacrol, linalool, diethylphthalate,
and alpha-terpineol. The oil component diethyl-phthalate is an artificial compound,
used as plasticizer or detergent bases in the industry. Our results support that exploiting its
flexibility and the possible hyphenations, overpressured layer chromatography is especially
attractive for isolation of antimicrobial components from various matrixes
Competition and performance in the Hungarian second pillar
The performance of the Hungarian second pillar since inception has been mixed. This is partly due to a less than satisfactory support for the 1997 pension reform, conservative fund portfolio distributions, the hybrid nature of the mandatory pension fund system, the segmented nature of the market in terms of costs, and a less than aggressive commitment on the part of the Hungarian Financial Supervisory Authority to a low-cost, transparent, and competitive equilibrium. In the accumulation phase, the authorities would need to further promote transparency and comparability of information on costs and investment performance, facilitate migration to lower cost funds, and more generally promote competition. The regulatory framework of the payout phase needs to be overhauled before the first cohort of workers retires.Investment and Investment Climate,Economic Theory&Research,Economic Stabilization,Financial Intermediation,Settlement of Investment Disputes
A critical-realist view of housing quality within the post-communist EU states: progressing towards a middle-range explanation
Employing a long-term perspective, we explore whether ideologically rooted quality outcomes of housing provision under communism have persisted during the post-communist construction of housing markets. Drawing on theories of path-dependent change, we hypothesize that patterns of housing quality still reflect past lines of division, namely the Soviet housing model, and the classical and reformist models of the Eastern Bloc. Using a critical-realist approach to housing quality, we relate householdsâ experiences to key underlying structures; this ontological depth is then operationalized by means of micro- and macro-indicators used as input for hierarchical cluster analyses. Findings support our main hypothesis, yet there is more diversity in householdsâ experiences than initially assumed. Our study advances a valuable middle-range epistemological frame for understanding the complex social reality of housing and helps shatter the growing view that communist housing systems were all too similar
Verifying and Monitoring IoTs Network Behavior using MUD Profiles
IoT devices are increasingly being implicated in cyber-attacks, raising
community concern about the risks they pose to critical infrastructure,
corporations, and citizens. In order to reduce this risk, the IETF is pushing
IoT vendors to develop formal specifications of the intended purpose of their
IoT devices, in the form of a Manufacturer Usage Description (MUD), so that
their network behavior in any operating environment can be locked down and
verified rigorously. This paper aims to assist IoT manufacturers in developing
and verifying MUD profiles, while also helping adopters of these devices to
ensure they are compatible with their organizational policies and track devices
network behavior based on their MUD profile. Our first contribution is to
develop a tool that takes the traffic trace of an arbitrary IoT device as input
and automatically generates the MUD profile for it. We contribute our tool as
open source, apply it to 28 consumer IoT devices, and highlight insights and
challenges encountered in the process. Our second contribution is to apply a
formal semantic framework that not only validates a given MUD profile for
consistency, but also checks its compatibility with a given organizational
policy. We apply our framework to representative organizations and selected
devices, to demonstrate how MUD can reduce the effort needed for IoT acceptance
testing. Finally, we show how operators can dynamically identify IoT devices
using known MUD profiles and monitor their behavioral changes on their network.Comment: 17 pages, 17 figures. arXiv admin note: text overlap with
arXiv:1804.0435
Europeâs Growth Emergency
Highlights:
âą The European Union growth agenda has become even more pressing because growth is
needed to support public and private sector deleveraging, reduce the fragility of the
banking sector, counter the falling behind of southern European countries and prove that
Europe is still a worthwhile place to invest.
âą The crisis has had a similar impact on most European countries and the US: a persistent
drop in output level and a growth slowdown. This contrasts sharply with the experience of
the emerging countries of Asia and Latin America.
âą Productivity improvement was immediate in the US, but Europe hoarded labour and
productivity improvements were in general delayed. Southern European countries have
hardly adjusted so far.
âą There is a negative feedback loop between the crisis and growth, and without effective
solutions to deal with the crisis, growth is unlikely to resume. National and EU-level
policies should aim to foster reforms and adjustment and should not risk medium-term
objectives under the pressure of events. A more hands-on approach, including industrial
policies, should be considered
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