GPR Application – Non-destructive Technology for Verification of Thicknesses of Newly Paved Roads in Slovakia

AbstractThe paper focuses on the use of non-destructive testing technology for measurement of asphalt and unbound pavement structure layer thicknesses for quality control and quality assurance within the context of civil engineering project handover process. In addition to layer thickness information, the pavement roughness was also verified using 3D accelerometer technique and IRI parameters were calculated and analyzed. This presentation summarizes the technology and results of a project where a special section of highway R2 Žiar nad Hronom bypass in the length of 5.2km was selected for the non-destructive testing. The processing and interpretation consists of extensive data sets presented as longitudinal profiles from survey of each lane of road. The designed layer thicknesses of the road were then compared with measured thickness data. In addition, a comprehensive presentation of the results in GIS view was produced to ensure the subsequent decision-making process easy to execute

Far Zone Effects for Integral Transformations: Theory and Implementation

Integrální transformace jsou užitečný matematický aparát pro modelování gravitačního pole a vyžadují formulaci integrálních odhadů včetně chybových charakteristik. Pro klasické integrální transformace byla již tato problematika prozkoumána, ale zatím nebyla studována formulace vzájemně vztahující všechny dostupné gravitační pozorovatelné veličiny. Předpokladem je globální pokrytí daty a globální integrace. Dostupnost dat může být omezená, proto globální integraci rozdělujeme na vliv blízkých a vzdálených zón. Výpočet vzdálených zón je nezanedbatelný systematický efekt, vyžadující přesný výpočet. Potřebná teorie a její implementace se realizují v podobě přesného softwarového nástroje. V tomto příspěvku představujeme základní teorii vlivu vzdálených zón. Dále studujeme vlastnosti integrálních jader a Moloděnského koeficientů. V numerických experimentech porovnáme výpočet vzdálených zón numerickou integrací s omezenou sumací ve formě sférických harmonických řad. Jedním z výstupů tohoto příspěvku je i softwarová knihovna na výpočet vlivu vzdálených zón pro integrální transformace až po třetí derivace gravitačního potenciálu.Integral transformations are a useful mathematical apparatus for modelling the gravitational field and require the formulation of integral estimates including error propagation. For classical integral transformations, this issue has already been studied, but the formulation for all available gravitational observables has not been studied yet. The assumption of integral transformations is global data coverage. In practice, however, data availability is limited, so we divide the global integration into the effects of the near and far zones. The computation of distant zones is a non-negligible systematic effect requiring an accurate calculation. The theory is implemented in the form of a precise software. In this paper, we present the basic theory for the evaluation of the far zones. We also investigate properties of integral kernels and truncation error coefficients. In the numerical experiments, we compare calculation of the far zones by numerical integration with truncated spherical harmonic series. One of the outputs of this contribution is a software library for computation of the far zones for integral transformations mutually relating all quantities up to the third derivatives of the gravitational potential

Influence of domain walls thickness, density and alignment on Barkhausen noise emission in low alloyed steels

This study deals with the characterization of low alloyed steels of diferent yield strengths (varying in the range of 235–1100 MPa) via Barkhausen noise emission. The study investigates the potential of this technique to distinguish among the low alloyed steels and all signifcant aspects contributing to Barkhausen noise, such as the residual stress state, microstructure expressed in terms of dislocation density, grain size, prevailing phase, as well as associated aspects of the domain wall substructure (domain wall thickness, energy, their spacing and density in the matrix). Barkhausen noise in the rolling as well as transversal direction grows along with the yield strength (up to 500 MPa) and the corresponding grain refnement of ferrite. As soon as the martensite transformation occurs in a high strength matrix, this evolution saturates, and remarkable magnetic anisotropy is developed when Barkhausen noise in the transversal direction grows at the expense of the rolling direction. The contribution of residual stresses as well as the domain wall thickness is only minor, and the evolution of Barkhausen noise is driven by the density of the domain walls and their realignment.Web of Science131art. no. 568

S66: A Well-balanced Database of Benchmark Interaction Energies Relevant to Biomolecular Structures

With numerous new quantum chemistry methods being developed in recent years and the promise of even more new methods to be developed in the near future, it is clearly critical that highly accurate, well-balanced, reference data for many different atomic and molecular properties be available for the parametrization and validation of these methods. One area of research that is of particular importance in many areas of chemistry, biology, and material science is the study of noncovalent interactions. Because these interactions are often strongly influenced by correlation effects, it is necessary to use computationally expensive high-order wave function methods to describe them accurately. Here, we present a large new database of interaction energies calculated using an accurate CCSD(T)/CBS scheme. Data are presented for 66 molecular complexes, at their reference equilibrium geometries and at 8 points systematically exploring their dissociation curves; in total, the database contains 594 points: 66 at equilibrium geometries, and 528 in dissociation curves. The data set is designed to cover the most common types of noncovalent interactions in biomolecules, while keeping a balanced representation of dispersion and electrostatic contributions. The data set is therefore well suited for testing and development of methods applicable to bioorganic systems. In addition to the benchmark CCSD(T) results, we also provide decompositions of the interaction energies by means of DFT-SAPT calculations. The data set was used to test several correlated QM methods, including those parametrized specifically for noncovalent interactions. Among these, the SCS-MI-CCSD method outperforms all other tested methods, with a root-mean-square error of 0.08 kcal/mol for the S66 data set

Magnetic Measurement of Zn Layer Heterogeneity on the Flange of the Steel Road Barrier

This study deals with monitoring of Zn layer heterogeneity on the flange of steel road barriers using magnetic measurements. The Barkhausen noise technique is employed for such purpose, and parameters extracted from Barkhausen noise signals are correlated with the true thickness of the Zn layer. The true values of the Zn layer were obtained from the metallographic images, as well as the thickness gauge CM-8825FN (Guangzhou Landtek Instruments Co. Ltd., Guangzhou, China) device. It was observed that the diffusion region lies below the Zn protective layer, which makes the thickness of the Zn layer obtained from the CM-8825FN device thicker than that measured on the metallographic images. For this reason, the chemical gradient of Zn below the Zn layer can be reported, and it affects Barkhausen noise emission. Barkhausen noise decreases along with increasing thickness of the Zn layer, and Barkhausen noise envelopes are shifted to stronger magnetic fields. The number of strong MBN pulses drops down with the increasing thickness of Zn coating at the expense of the increasing number of the weak MBN pulses. The thickness of Zn coating can be polluted by the solidification of Zn melt after galvanizing. The presence of the diffusion layer dims the contrast between ferromagnetic and paramagnetic phases

Logistics processes of BORCAD Medical a.s. company

Bakalářská práce se zaměřuje na logistické procesy ve společnosti BORCAD Medical a.s. se zaměřením na řízení stavu zásob a s tím souvisejícími materiálovými toky. Práce obsahuje aktuální analýzu řízení zásob ve společnosti a poukazuje na nedostatky ve výrobních a materiálových procesech. Součástí bakalářské práce jsou také návrhy na zlepšení řízení zásob a jejich vyhodnocení, které přispějí ke zlepšení logistických procesů ve společnosti.The bachelor thesis focuses on logistic processes in BORCAD Medical a.s. with a focus on inventory management and related material flows. The thesis contains current analysis of inventory management in the company and points out the shortcomings in production and material processes. Part of the thesis are also proposals for improving inventory management and their evaluation, which will contribute to improving logistics processes in the company.Dopravní fakulta Jana PerneraStudent dokázal svou bakalářskou práci obhájit. V problematice se orientoval s menší jistotou a pohotovostí. Na doplňující otázky odpověděl s určitými nepřesnostmi

Economic Functions Proposal of Urgency Prioritization of Investment Projects of Operated Railway Bridges

The main objective of the article is to describe the proposals of economic functions within the prioritization of urgency investments of operated railway bridges within a comprehensive evaluation of existing bridges. The purpose of the paper is a comprehensive assessment of existing bridges and to define determinants and determinants of decision-making and designing a mechanism of decision-making procedures of prioritized infrastructure measures in the form of repairs and reconstructions of bridges resulting from the records of supervising activities based not only on technical but also economic aspects to the railway infrastructure manager

DESIGN AND EVALUATION OF SURFACING CONDITION OF BUS STOP PAVEMENTS

Príspevok opisuje problematiku navrhovania a hodnotenia stavu povrchov krytov autobusových zastávok miestnych komunikácií. Najväčšia pozornosť sa venuje asfaltovým vozovkám a vozovkám z dlažieb vrátane ich najstarších dochovaných pozostatkov, pričom v článku sú uvedené zásady dimenzovania podľa TP 170 platných v ČR, pretože na Slovensku neexistuje relevantný predpis vo vzťahu ku navrhovaniu vozoviek autobusových zastávok. V praktickej časti príspevku sú prezentované výstupy prieskumu stavu povrchu vybraných 37 autobusových zastávok v meste Žilina (1). Na základe vyhodnotenia uskutočneného monitoringu a analýzy získaných poznatkov sú v závere príspevku uvedené odporúčania ku návrhu predmetných vozoviek.The paper deals with the problematic of pavement design and surfacing evaluation of the urban bus stops. The most attention is paid to the asphalt pavements, sett paving and its historical development, as well as their design itself, according to the technical conditions 170 valid in Czech Republic, because in Slovakia there are no such conditions available. In the practical part, the paper evaluates and solves condition of selected 37 bus stops in the city of Žilina (1). As a conclusion, the paper provides recommendations for design of urban bus stops for a consideration of realized monitoring