Search results for "PROB"
showing 10 items of 8859 documents
Large-eddy simulations of turbulent flow with heat transfer in simple and complex geometries using Harwell-FLOW3D
1996
Abstract Large-eddy simulation (LES) results are presented and discussed for the turbulent flow with heat transfer in different geometrical configurations, including a plane channel, a channel bearing transverse square ribs on one of the walls, and a crossed-corrugated air heater. They were obtained using the computational fluid dynamics (CFD) code Harwell-FLOW3D (Release 2), finite-volume grids having up to 423 nodes, and the Smagorinsky subgrid model with several variants regarding near-wall damping and wall boundary conditions. The first problem (plane turbulent Poiseuille flow with heat transfer) was mainly used as a benchmark to investigate the influence of numerical methods (pressure-…
On the Stability of Stablecoins
2021
This paper investigates the volatility processes of stablecoins and their potential stochastic interdependencies with Bitcoin volatility. We employ a novel approach to choose the optimal combination for the power law exponent and the minimum value for the volatilities bending the power law. Our results indicate that Bitcoin volatility is well-behaved in a statistical sense with a finite theoretical variance. Surprisingly, the volatilities of stablecoins are statistically unstable and contemporaneously respond to Bitcoin volatility. Also, whereas the volatilities of stablecoins are not Granger-causal for Bitcoin volatility, lagged Bitcoin volatility exhibits Granger-causal effects on the vol…
New client puzzle approach for DoS resistance in ad hoc Networks
2010
In this paper we propose a new client puzzle approach to prevent Denial of Service (DoS) attacks in ad hoc networks. Each node in the network first solves a computational problem and with the solution has to create and solve a client puzzle. By combining computational problems with puzzles, we improve the efficiency and latency of the communicating nodes and resistance in DoS attacks. Experimental results show the effectiveness of our approach.
Czy administracja publiczna musi wykonywać zadania z zakresu pomocy społecznej?
2020
Administracja publiczna powołana jest do realizacji zadań przypisanych państwu, a zatem takich, które przekraczają możliwości członków wspólnoty składającej się na państwo. Jednym z takich zadań jest wspieranie osób, które własnym staraniem nie są w stanie zaspokajać własnych potrzeb. Jego realizacja przez państwo wynika z zasady solidarności, która wspólnie z zasadą pomocniczości leży u podstaw wspierania tych, którzy nie są w stanie właściwie zadbać o własne potrzeby. Pomoc społeczna jest tą sferą aktywności społecznej, która może być zaspokajana mocą aktywności podmiotów indywidualnych, jednakże wspólnota po to utworzyła państwo, aby przy jego wykorzystaniu wspierać słabszych i tych, któ…
Firm Demography in the Accommodation Industry. Evidence from Italian Insular Regions
2020
The purpose of this study is to analyse the spatial pattern and the post-entry performance of tourism businesses in the Italian insular regions of Sardinia and Sicily. Using geo-referenced micro-data for the period 2011-2014, we explore the spatial distribution of ac-commodation firms in the two insular regions, and then compare the coastal and inland areas of the two regions. We observe a higher dispersion of firms in Sardinia than in Sicily; the latter, however having a higher concentration of firms in coastal and urban areas. We do not find significant differences in survival probability across the two insular regions but we do detect significant differences be-tween coastal and inland a…
Corporate Governance Mechanisms for Monitoring or Empowering CEOS? A Study of Chinese Listed Firms
2008
This study examines the impact of governance mechanisms in monitoring or empowering top executives on firm performance. We distinguish between two competing theories, namely agency theory and stewardship theory, which hold conflicting assumptions about CEOs behaviour and hence offer different recommendations concerning corporate governance structure. We conduct an empirical study based on 837 publicly listed companies in China over the period of 2005-2007, the findings of this study provide strong support for stewardship theory. The results suggest that governance mechanisms that can empower CEOs work better in the Chinese context, specifically, a longer CEO tenure and lower board independe…
Experimental Investigations and Numerical Analysis for Improving Knowledge of Incremental Sheet Forming Process for Sheet Metal Parts
2009
The paper is related to the analysis of shape distortions and springback effects arising in Single Point Incremental Forming. An experimental set up has been designed and manufactured to carry single point incremental forming on small size sheet metal parts. The experimental set up is mounted on 3-axes CNC milling machine tool and the forming tool is attached and move with the spindle. Experiments have been carried out on sheet metal parts to obtain tronconical shapes. The forming strategy associated to the movement of the forming tool has been also investigated. The experiments indicate that shape distortions arising in the corners of the tronconical shape are clearly related to forming st…
Helical Shift Mechanics of Rubber V-Belt Variators
2011
A very common configuration of V-belt variators for motorcycles considers the correction of the belt tensioning depending on the resistant torque by means of suitable helical-shaped tracks allowing the driven half-pulleys to close/open. The theoretical model for belt-pulley coupling is rather complex for this configuration, where one half-pulley may run in advance and the other one behind with respect to the belt, and requires the repeated numerical solution of a strongly nonlinear differential system by a sort of shooting technique, until all the operating conditions are fulfilled (angular contact extent, torque, and axial force). After solving the full equations, the present study develop…
Aprobežotu aizgadības tiesību atjaunošana un bērna vislabāko interešu mijiedarbība.
2020
Bērna vislabāko interešu aizsardzība aprobežotu aizgādības tiesību atjaunošanas gadījumos ir aktuāla tēma mūsdienās, jo mainās sabiedrības vērtības un uzskati par labvēlīgas vides nodrošināšanu bērnam. Savukārt institūcijām, kas nodrošina bērna tiesību aizsardzību, visos gadījumos, kad ir apdraudēta bērna labklājība, jānodrošina bērna vislabākajām interesēm atbilstoša rīcība un lēmumi. Bakalaura darba mērķis ir noskaidrot vai Latvijas normatīvo aktu regulējums aprobežotu aizgādības tiesību atjaunošanas jautājumos nodrošina bērna tiesību aizsardzību un bērna vislabākajām interesēm atbilstošu risinājumu. Problēmas pastāv aprobežotu aizgādības tiesību atjaunošanas regulējumā, kā arī regulējumā…
Bērnu uzvedības problēmas grupā un tās pedagoģiskās korekcijas iespējas
2021
Darba mērķis: teorētiski noskaidrot un empīriski pārbaudīt uzvedības problēmu grupiņā pedagoģiskās korekcijas iespējas, lai tās sekmīgi izmantotu praksē turpmākajā pedagoģiskajā darbībā pirmsskolas jaunākā vecumposma grupā. Kvalifikācijas darbs sastāv no divām daļām – teorētiskās un empīriskās daļas Teorētiskā daļa: divās nodaļās izpētīta teorētiskā literatūra par uzvedības problēmu cēloņiem un sekām; kā arī uzvedības problēmu pedagoģiskās korekcijas iespējas un nosacījumi pirmsskolas jaunākā vecumposma grupā. Empīriskā daļa: aprakstīti un analizēti pedagoģiskā vērojuma dati, kā pielietojot uzvedības problēmu pedagoģiskās korekcijas programmu un veicinot bērnu psiholoģisko kompetenci jeb so…