Filters
total: 7451
-
Catalog
- Publications 4991 available results
- Journals 36 available results
- Conferences 6 available results
- Publishing Houses 1 available results
- People 77 available results
- Projects 1 available results
- e-Learning Courses 657 available results
- Events 15 available results
- Open Research Data 1667 available results
displaying 1000 best results Help
Search results for: DRILLING COUPLE
-
Scientific Drilling
Journals -
Drilling couples and refined constitutive equations in the resultant geometrically non-linear theory of elastic shells
PublicationIt is well known that distribution of displacements through the shell thickness is non-linear, in general. We introduce a modified polar decomposition of shell deformation gradient and a vector of deviation from the linear displacement distribution. When strains are assumed to be small, this allows one to propose an explicit definition of the drilling couples which is proportional to tangential components of the deviation vector....
-
Investigations of broadband multilayered coupled line couplers
PublicationW pracy przedstawiono dwa układy szerokopasmowych sprzęgaczy 3dB. Pierwszy układ zrealizowany jest w oparciu o linie paskowe z rowkowanym ekranem. Drugi układ to zmodyfikowany układ sprzęgacza mikrofalowego zrealizowanego w oparciu o linie mikropaskowe ze wspólną masą. Zaproponowane układy sprzęgaczy odznaczają się szerszym pasmem pracy w porównaniu do układów prezentowanych w literaturze. Wyniki symulacji układów zostały zweryfikowane...
-
SPE DRILLING & COMPLETION
Journals -
Technological and tribological aspects of milling-burnishing process of complex surfaces
Publication -
Broadside coupled stripline with double-side UC-PBG structure
PublicationRozważono strukturę linii paskowych sprzężonych szerokim bokiem z periodycznie zaburzoną metalizacją masy typu UC-PBG (Uniplanar Compact - Photonic BandGap). W celu oceny przydatności struktury zaprojektowano, wykonano i przebadano sprzęgacz 3dB. Potwierdzono przewidywany efekt spowolnienia fali (slow wave effect), którego konsekwencją jest możliwość znacznej redukcji wymiarów układu.
-
Broadside Coupled Stripline with Double-Side UC-PBG Structure.
PublicationPoddano analizie symetryczną linię paskową z dwustronnie umieszczoną na płaszczyznach masy strukturą typu UC-PBG (uniplanar compact-photonic bandgap).Zaprojektowano, wykonano i pomierzono sprzęgacz wykonany w oparciu o tego typu prowadnicę. Miniaturyzacja wymiarów układu potwierdziła spodziewany efekt spowolnienia fali wywołany wprowadzeniem struktury UC-PBG.
-
Mechatronic design for the high speed milling surveillance of the complex and flexible details
PublicationW pracy przedstawiono mechatroniczny system tworzenia mapy optymalnych prędkości obrotowych wrzeciona. W trakcie frezowania szybkościowego przedmiotów podatnych mogą wystąpić drgania samowzbudne typu chatter. Używana zazwyczaj procedura ustawiania wymaganej prędkości obrotowej wrzeciona metodą prób i błędów, w wielu przypadkach nie jest zalecana. Przedstawiona procedura nadzorowania może doprowadzić do uniknięcia ryzyka wystąpienia...
-
Investigation of the double isolator using three-strip Ferrite Coupled Line
PublicationArtykuł prezentuje badania izolatora skonstruowanego z sekcji trój-paskowej ferrytowej linii sprzężonej. Element został zaprojektowany na dwa sposoby: jako kaskadowe połączenie dwóch cyrkulatorów oraz jako struktura planarna zawierająca rezystory. Izolator zbadano teoretycznie i eksperymentalnie.
-
Solution of coupled integral equations for quantum scattering in the presence of complex potentials
PublicationIn this paper, we present a method to compute solutions of coupled integral equations for quantum scattering problems in the presence of a complex potential. We show how the elastic and absorption cross sections can be obtained from the numerical solution of these equations in the asymptotic region at large radial distances.
-
Drilling Fluid and Completion Fluid
Journals -
Numerical modelling of asymetric double-layer Al-Cu plate rolling process
PublicationNiekorzystnym zjawiskiem towarzyszącym procesom walcowania płaskich wyrobów bimetalowych jest krzywizna pasma na wyjściu z kotliny walcowniczej wynikająca z nierównomierności odkształcenia warstw bimetalowej blachy. Możliwość szybkiego i łatwego przeciwdziałania temu zjawisku daje wprowadzenie asymetrii prędkości bądź średnic walców roboczych. W przedstawionym artykule zaprezentowano badania komputerowe procesu walcowania blach...
-
Analysis of the Application of Horizontal Directional Drilling
PublicationConstruction works are often considered to be very intrusive for the environment. Project designers assume deep excavations, or a complete replacement of the ground within the investment, which sometimes changes the initial conditions drastically. The problem started to appear in places, where the terrain is complicated and the excavation is burdensome. Some of state authorities...
-
Simplified Map-based Selection of Optimal Spindle Speeds When Milling Complex Structures
PublicationIn the paper a method for selecting optimal spindle speeds for complex structures during milling operations is presented. It is based on the selection of the spindle speed in accordance with a simple equation resulting from the minimisation of vibration energy, which leads to the minimisation of the work of cut-ting forces presented in previous elaborations by the authors [1]. Optimal spindle speeds are obtained for many points...
-
AGH Drilling, Oil, Gas Quarterly
Journals -
Molecularly imprinted stir bar sorptive extraction coupled with atomic absorption spectrometry for trace analysis of copper in drinking water samples
Publication -
New concept of drilling auger for displacement pile installation
PublicationIn 2020, a new version of the screw displacement auger for pile installation in soil was developed and patented in Poland. It was named DPDT (Displacement Pile Drilling Tool). The general aim of its development was to reduce the soil resistances to the auger during screwing into the ground while maintaning a good load-bearing capacity for the screw displacement piles. The “DPDT-Auger” prototype was tested as a scaled-down model...
-
Novel Desorber for Online Drilling Mud Gas Logging
PublicationThis work presents the construction solution and experimental results of a novel desorber for online drilling mud gas logging. The traditional desorbers use mechanical mixing of the liquid to stimulate transfer of hydrocarbons to the gaseous phase that is further analyzed. The presented approach is based on transfer of hydrocarbons from the liquid to the gas bubbles flowing through it and further gas analysis. The desorber was...
-
Cavitation Erosion of P110 Steel in Different Drilling Muds
PublicationThe P110 steel specimens were subjected to ultrasonic cavitation erosion in different compositions of drilling muds and surfactant additive. The test procedure was based on ASTM-G-32 standard recommendations. API 5CT-P110 steel is used for pipes in oil and gas industry. The harsh environment and high velocity of flows poses corrosive and erosive threat on materials used there. The composition of drilling fluid influences its rheological...
-
Specific Binding of Cholesterol to the Amyloid Precursor Protein: Structure of the Complex and Driving Forces Characterized in Molecular Detail
PublicationC99 is the C-terminal membrane-bound fragment of the amyloid precursor protein that is cleaved by γ-secretase to release Aβ peptides, the hallmark of Alzheimer’s disease (AD). Specific interactions of C99 with cholesterol have been proposed to underlie the recognized role of cholesterol in promoting amyloidogenesis. By using molecular dynamics simulations, we studied cholesterol binding to C99 in a lipid bilayer. We determined...
-
Water: Drinking
PublicationOpisano źródła organicznych i nieorganicznych zanieczyszczeń wody do picia w tym: lotnych związków chlorowcoorganicznych, pestycydów, wielopierścieniowych węglowodorów aromatycznych, polichlorowanych bifenyli, fenoli, kwasów chlorooctowych, aldehydów, ketonów itp. a także metody ich oznaczania. Przedstawiono schemat technik izolacji i oznaczania końcowego oraz schemat metod wykorzystujących analizę fazy nadpowierzchniowej. Opisano...
-
The optimisation of analytical parameters for routine profiling of antioxidants in complex mixture by HPLC coupled post-column derivatisation
PublicationIntroduction: The wide application of natural and artificial antioxidants in food, cosmetic and pharmaceutical industry as well as the recognition of the importance of food antioxidants for supporting human health created demand for reliable and industrially applicable methods of determining antioxidative activity. This requirement can be fullfilled with the recently proposed HPLC-post-column derivatisation approach enabling the...
-
Novel composite of Zn/Ti-layered double hydroxide coupled with MXene for the efficient photocatalytic degradation of pharmaceuticals
PublicationIn the present study, a hybrid photocatalyst of Zn/Ti layered double hydroxide (LDH) coupled with MXene – Ti3C2 was synthesized for the first time and applied in photocatalytic degradation of acetaminophen and ibuprofen, two commonly present in the natural environment and prone to accumulate in the aquatic ecosystem pharmaceuticals. The effect of MXene content (0.5 wt%, 2.5 wt%, and 5 wt%) on the photocatalytic activity of LDH/MXene...
-
Ellipticity in couple-stress elasticity
PublicationWe discuss ellipticity property within the linear couple-stress elasticity. In this theory, there exists a deformation energy density introduced as a function of strains and gradient of macrorotations, where the latter are expressed through displacements. So the couple-stress theory could be treated as a particular class of strain gradient elasticity. Within the micropolar elasticity, the model is called Cosserat pseudocontinuum...
-
Modelling of Ship’s Heeling and Rolling for the Purpose of Gantry Control Improvement in the Course of Cargo Handling Operations in Sea Ports
PublicationThe paper presents two proposals of models of interaction between a ship and cargo being loaded or discharged by a gantry in port, in terms of heeling and rolling of the vessel. The main purpose of such modelling is the need for improvement of gantry control with regard to faster operations thanks to more accurate estimation of level and moment of cargo release from a gantry hook or spreader. The study may be the contribution to...
-
Material independent effectiveness of workpiece vibration in μ-EDM drilling
Publication -
Elastoplastic law of Cosserat type in shell theory with drilling rotation
PublicationWithin the framework of six-parameter non-linear shell theory, with strain measures of the Cosserat type, we develop small-strain J2-type elastoplastic constitutive relations. The relations are obtained from the Cosserat plane stress relations assumed in each shell layer, by through-the-thickness integration employing the first-order shear theory. The formulation allows for unlimited translations and rotations. The constitutive...
-
Driving Performance Indicators of Electric Bus Driving Technique: Naturalistic Driving Data Multicriterial Analysis
PublicationThe issue of electric energy saving in public transport is becoming the key area of interest. By improving of driving techniques and the implementation of eco-driving, it is possible to save electric energy. Systems that help to decrease energy consumption and to reduce fuel emissions are becoming popular in vehicles powered by diesel engines. However, these methods have not yet gained popularity in electric vehicles. Therefore,...
-
Effect of Double-Slope Modulation Signals on Conducted Emissions and Efficiency of Strongly Coupled Magnetic Resonance WPT Systems
Publication -
Frequency-Variant Double-Zero Single-Pole Reactive Coupling Networks for Coupled-Resonator Microwave Bandpass Filters
PublicationIn this work, a family of frequency-variant reactive coupling (FVRC) networks is introduced and discussed as new building blocks for the synthesis of coupled-resonator bandpass filters with real or complex transmission zeros (TZs). The FVRC is a type of nonideal frequency-dependent inverter that has nonzero elements on the diagonal of the impedance matrix, along with a nonlinear frequency-variation profile of its transimpedance...
-
Drugs and driving
PublicationW referacie przedstawiono we wprowadzeniu pojawienie się nowego zagrożenia, jakim jest kierowanie pojazdów przez osoby będące pod wpływek narkotyków. W drugiej części przedstawiono obecnie obowiązujące sankcje, jakie mogą spotkać kierującego oraz definicję środków odurzających, po zażyciu których nie można prowadzić samochodu. W trzeciej części przedstawiono badania naukowe przeprowadzone w Polsce i Niemczech, które pokazują jak...
-
Integrated Ocean Drilling Program: Preliminary Reports
Journals -
Analysis of drinking water
PublicationOpisano źródła organicznych i nieorganicznych zanieczyszczeń wody do picia w tym: lotnych związków chlorowcoorganicznych, pestycydów, wielopierścieniowych węglowodorów aromatycznych, polichlorowanych bifenyli, fenoli, kwasów chlorooctowych, aldehydów, ketonów itp. a także metody ich oznaczania. Przedstawiono schemat technik izolacji i oznaczania końcowego oraz schemat metod wykorzystujących analizę fazy nadpowierzchniowej. Opisano...
-
Analysis of drinking water
PublicationOpisano źródła organicznych i nieorganicznych zanieczyszczeń wody do picia w tym: lotnych związków chlorowcoorganicznych, pestycydów, wielopierścieniowych węglowodorów aromatycznych, polichlorowanych bifenyli, fenoli, kwasów chlorooctowych, aldehydów, ketonów itp. a także metody ich oznaczania. Przedstawiono schemat technik izolacji i oznaczania końcowego oraz schemat metod wykorzystujących analizę fazy nadpowierzchniowej. Opisano...
-
Estimation of Screw Displacement Pile-Bearing Capacity Based on Drilling Resistances
PublicationThis article presents an engineering, empiricalmethod of estimating the bearing capacity and settlementcharacteristics Q-s of screw displacement piles andcolumns, based on soil resistance encountered during thedrilling to form piles/columns in the ground. The methodwas developed on the basis of correlation analyses of thetest results of 24 piles made during the “DPDT-Auger”research project (Krasiński et al., 2022a). In the proposedmethod,...
-
Elastic wave propapagation in diagnostics of self-drilling system of grouted anchors
PublicationThe paper presents an experimental investigation of elastic wave propagation in a self-drilling hollow bar system, which is commonly used in geotechnical industry as the element of grouted ground anchors and soil nails. The single self-drilling hollow bar and self-drilling system of two bars connected by a coupler were considered. Longitudinal waves were excited at one end of the bar and registered at both ends, by means of PZT...
-
Coupled Systems Mechanics
Journals -
Couple and Family Psychology-Research and Practice
Journals -
Wet-Milling of Cereals
Publication -
Failure analysis and modernization of high-pressure hydraulic press for drilling tubes testing
Publication -
Modeling of Composite Shells in 6-Parameter Nonlinear Theory with Drilling Degree of Freedom
PublicationWithin the framework of a 6-parameter nonlinear shell theory, with strain measures of Cosserat type, constitutive relations are proposed for thin elastic composite shells. The material law is expressed in terms of five engineering constants of classical anisotropic continuum plus an additional parameter accounting for drilling stiffness. The theory allows for unlimited displacements and rotations. A number of examples are presented...
-
Coupled - mode design of ferrite loaded coupled microstrip lines section
PublicationMetodę rodzajów sprzężonych zastosowano do analizy i projektowania sekcji ferrytowych mikropaskowych linii sprzężonych magnesowanych podłużnie (FCL). W wyniku analizy określono macierz rozproszenia sekcji oraz warunki umożliwiające jej zastosowanie do realizacji cyrkulatora projetowanego jako połączenie badanej sekcji FCL z mikropaskowym rozgałęzieniem typu T. W oparciu o opracowane oprogramowanie przeprowadzono modelowanie parametrów...
-
Accurate rolling resistance Rolling resistance measurements can be influenced by a number of factors
PublicationTire rolling resistance is one of the most difficult-to-measure parameters of the tire/ pavement interface, especially if road measurements are required. First of all, it is necessary to measure a fairly small force in the system that is heavily loaded by other forces and subjected to many adverse effects causing measurement errors. The second problem is related to the fact that tire rolling resistance depends on many factors,...
-
Drinking Water Engineering and Science
Journals -
Trust in the source of received information as a factor related to public perception of shale gas drilling
Publication -
Radioactivity of drilling cuttings from shale resources of the Lower Paleozoic Baltic Basin, Poland
PublicationFractionated drilling wastes originating from shale gas exploration in the Baltic Basin in Pomerania were subjected to the measurements of mean activity concentrations of naturally occurring radioactive materials (NORMs).To better understand rock structure and texture, the X-ray diffraction analysis (XRD) and scanning electron microscopy(SEM) observation were used. To compare activity concentration of radionuclides in bulk wastes...
-
On the effective properties of foams in the framework of the couple stress theory
PublicationIn the framework of the couple stress theory, we discuss the effective elastic properties of a metal open-cell foam. In this theory, we have the couple stress tensor, but the microrotations are fully described by displacements. To this end, we performed calculations for a representative volume element which give the matrices of elastic moduli relating stress and stress tensors with strain and microcurvature tensors.
-
Is Financialization Killing Commodity Investments?
Publication -
Statistical Dynamics of the Rolling Mills
Publication -
Location of ship rolling axis.
PublicationPodano definicję osi kołysań statku i metodę określania jej położenia. Położenie osi zależy nie tylko od rozkładu mas statku ale równiez od tzw. ''mas towarzyszących'', które są reprezentacją sił hydrodynamicznych działających na statek w czasie kołysania. Podano proste formuły pozwalajace obliczyć poprawne położenie osi kołysań statku.