Wyniki wyszukiwania - Biblioteka Nauki

Ten serwis zostanie wyłączony 2025-02-11.

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: integrity testing

Sortuj według:

Ogranicz wyniki do:

Integrity Testing in Poland — Issues, Experience and Practical Comments

100%

Hac P.

Internal Security

2016

tom 8(2)

67-84

The aim of this article is to present a subject not widely known in Poland: the tool known as Integrity Testing that is in place in several countries of the world (including countries in Europe). It is used to fight corruption and irregularities in the functioning of public institutions and means the possibility of anti-corruption authorities creating a false corruption situation in order to verify an officer’s behaviour. The motives for the inception of the procedure, its assumptions and the basic conditions of use are presented,and the terminology used is also explained. It shows the positive, preventive aspects of the use of tests and the need for a professional approach to these on the part of the people implementing and performing them. For the purposes of this article the tests described have been divided into four main groups and the criteria adopted have been explained. A comparative analysis of integrity testing as used by institutions in the United States, Australia, Great Britain, Romania and the Czech Republic is also carried out, specifying the key differences between these systems, including how to implement procedures and the possible use of the results. Specific figures are given concerning the number of tests carried out in some countries and their effectiveness. The assumptions used in integrity tests are also compared to current similar solutions in the anti-corruption law operating in the Polish police (Article 19 of the Police Act). Also outlined are the main problems requiring a response before any possible start of work on the implementation of integrity tests in Poland. At the same time it is noted that in the years 2007–2008 the Polish Police worked on a similar legal solution, but ultimately this was not accepted. The article is based on the author’s personal knowledge and experience resulting in a highly pragmatic picture of the issues presented.

Badania prędkości fali akustycznej w betonie pali CFA

75%

Gorska K. , Rybak J.

Górnictwo i Geoinżynieria

2011

tom R. 35, z. 2

251-256

Podstawową informacją w analizie wyników badań nieniszczących długości i ciągłości pali fundamentowych jest prędkość fali w betonie. Przykładowo, znaczne różnice obserwuje się w prędkościach fali mierzonych w palach prefabrykowanych. Dla betonu pali C50 prędkość fali akustycznej osiąga 4500 m/s, natomiast po ich wbiciu oscyluje wokół 4000 m/s. Jest to prawdopodobnie związane z mikrozarysowaniami powstałymi w procesie wbijania. Błędy w oszacowaniu prędkości fali prowadzą do proporcjonalnych błędów w oszacowaniu długości pali (10%). Szczególnie skomplikowane zagadnienie stanowi oszacowanie prędkości fali w młodym betonie (przed 15 dniem od betonowania). Nieliczne publikacje wskazują na dużą zmienność szacowanej prędkości fali i wskazują na konieczność każdorazowej kalibracji na placu budowy. Taka kalibracja jest możliwa jedynie gdy osoba prowadząca badania posiada wiarygodne informacje o długości badanych pali (metryki pali). Program badawczy prowadzony przez Politechnikę Wrocławską wskazuje, że w przypadku pali CFA z betonu C20/25 badanych między 5 a 15 dniem od betonowania, prędkość fali w zmienia się w przedziale 3000-4000 m/s.

Regarding the issue of the pile quality (continuity and length) tests by means of non-destructive methods, it seems essential to estimate the velocity of the elastic wave in the concrete. For example, considerable differences are observed in the measurement of the wave velocity before and after the pre-cast concrete piles are driven. For reinforced concrete piles made of the C50 concrete, the elastic wave velocity measured before driving reaches 4500 m/s, and after the driving - it oscillates around 4000 m/s. That is probably connected with the micro-cracking caused when driving the pile. The errors in velocity estimation may lead straight to proportional faults in the estimation of the pile's length (10%). It is even more complicated to determine the wave velocity in the process of the young concrete setting (before the 15th day of concrete embedding). Very few publications on that subject show large changeability of the estimated velocity and suggest that each time at the construction site calibration should take place. Calibration, however, is possible only when the person who runs the tests is in possession of fully credible information about the length of the examined (controlled) piles. The research conducted at Wroclaw University of Technology show that in the case of the concrete piles made of the C25 concrete, examined between the 5th and 15th day after the concrete embedding, the measured elastic wave velocities ranged from 3000-4000 m/s.