Wyniki wyszukiwania dla: CIVIL SERVANTS

Mutual hydrodynamic interaction between the operating propeller and the rudder

Publikacja

J. Szantyr

- Archives of Civil and Mechanical Engineering - Rok 2007

Praca przedstawia opis algorytmu i programu do analizy oddziaływania hydrodynamicznego pomiędzy pracującą śrubą a sterem. Algorytm jest oparty na jednoczesnym rozwiązaniu zadania brzegowego dla śruby i steru. Wyniki obliczeń obejmują rozkłady ciśnienia i zmienne siły hydrodynamiczne na śrubie i sterze oraz niestacjonarne zjawiska kawitacyne na obu obiektach. Wyniki obliczeń porównano z rezultatami badań eksperymentalnych.

Statistical data of hull main parameters useful for preliminary design of SWATH ships

Publikacja

J. Michalski

- Archives of Civil and Mechanical Engineering - Rok 2007

W artykule przedstawiono rezultaty badań dotyczących statystycznych relacji głównych parametrów projektowych kadłuba statków typu SWATH, wykonanych w oparciu o zebrane w literaturze przedmiotu dane o ponad osiemdziesięciu statkach. Zależności statystyczne przedstawiono w postaci histogramów: długości statku L, histogramów wartości stosunków długości do szerokości L/B, długości do wysokości bocznej L/H, długości pływaków do ich...

3D Form analysis of rope deformation with long towed underwater hydroacoustic antenna

Publikacja

J. Bielański

- Archives of Civil and Mechanical Engineering - Rok 2007

Artykuł opisuje rozwiązanie zagadnienia brzegowego dla zestawu długiej liny holującej i podwodnej anteny hydroakustycznej o gęstości, tej ostatniej, nieznacznie większej od gęstości wody i małej sztywności. Znane jest tylko położenie punktu zamocowania liny do okrętu (p-kt początkowy holowanego zestawu) oraz głębokość, na której znajduje się koniec anteny. Przedstawiono analizę sił działających na holowany zestaw, ich równania...

Influence of instalation of piles with partial and full displacement of the soil on the subsoil strength

Publikacja

- Architecture Civil Engineering Environment - Rok 2008

Zjawiska zachodzące w bezpośrednim sąsiedztwie pobocznicy pali przemieszczeniowych mają ważne znaczenie dla ich pracy w podłożu. Zmiany stanu naprężenia pionowego, poziomego, zmiana struktury gruntu, wilgotności i zagęszczenia stwarza nowe warunki oddziaływania w strefie pobocznica - podłoże. Przedstawiono wyniki badań sondą CPT w sąsiedztwie pali CFA dla gruntów uwarstwionych, niespoiste / spoiste. Zwrócono uwagę na dobór parametrów...

Constructed wetlands systems for wastewater treatment in Poland

Publikacja

- Architecture Civil Engineering Environment - Rok 2008

Oczyszczalnie hydrofitowe mogą stanowić interesującą alternatywę dla konwencjonalnych rozwiązań gospodarki ściekowej na terenach o rozproszonej zabudowie. Celem pracy była ocena działania i skuteczności usuwania zanieczyszczeń w hybrydowych systemach hydrofitowych pracujących w rejonie Gdańska, w klimacie umiarkowanym.Technologiczne rozwiązanie składające się z osadnika gnilnego oraz złoża hydrofitowego z podpowierzchniowym przepływem...

The effect of aggregate characteristics on the fracture behaviour of fine-grained concrete under tensile loading

Publikacja

Ł. Skarżyński
J. Tejchman

- Architecture Civil Engineering Environment - Rok 2012

Artykuł przedstawia analizę wpływu kruszywa na zjawisko pękania drobnoziarnistego betonu podczas quasi-statycznego trzypunktowego zginania. Beton został opisany jako stochastyczny i niejednorodny materiał trzyfazowy. Dwuwymiarowe obliczenia numeryczne dla betonowych belek z nacięciem wykonano metodą elementów skończonych stosując izotropowy materiałowy model z degradacją sztywności rozszerzony o długość charakterystyczną mikrostruktury...

PARTICLE SIZE ANALYSIS OF SUSPENSIONS IN REMOVING OF ORGANIC MATTER AND PHOSPHORUS FROM WASTEWATER AND SURFACE WATER

Publikacja

- Architecture Civil Engineering Environment - Rok 2012

In this paper the particle size of suspended solids in the removing of organic matter and phosphorus compounds from lake water and wastewater treated in the Ecological Treatment Systems (ETS) was analyzed. The invesigated materials were taken from two ETS located in Pomerania Region/Poland. Object in Swarzewo is 3rd stage of biological treatment of municipal wastewater, while object in Kartuzy has task to remove a phosphorus from...

Successfull urban regeneration project: Gdansk-Letnica district case study

Publikacja

- Civil and Environmental Engineering Reports - Rok 2013

The paper presents the process of urban regeneration of Gdansk Letnica district, a project that from a very short time perspective can be described as successful. The paper present a brief district's history as well as analysis of circumstances that may have influenced Gdansk authorities' decision of starting an urban regeneration project.

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Experimental Testing of Innovative Cold-Formed "GEB" Section / Badania Eksperymentalne Innowacyjnego Kształtownika Giętego Na Zimno Typu „Geb“

Publikacja

- Civil and Environmental Engineering Reports - Rok 2015

One of the major advantages of light gauge steel structures made of cold-formed steel sections is their low weight, so manufacturers are increasingly using the possibilities of those sections for the production of typical single-storey steel structures systems. Well known profiles, such as Z, C and the so called hat sections that have been studied and described in the literature, are used mainly as purlins or truss components....

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Mechanical Properties of Polyester Coated Fabric Subjected to Biaxial Loading

Publikacja

A. Ambroziak

- JOURNAL OF MATERIALS IN CIVIL ENGINEERING - Rok 2015

The paper is focused on the comparison between uniaxial and biaxial laboratory test results for polyester coated fabric. A short literature review concerning coated woven fabrics with emphasis on biaxial tensile tests is presented. A description of the polyester-coated fabric under biaxial test by means of constitutive models and material parameter values is proposed. To establish the right values of the ultimate tensile strength,...

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Possible effects of the 1984 St. Clair River ice jam on bed changes

Publikacja

T. Kolerski
H. T. Shen

- CANADIAN JOURNAL OF CIVIL ENGINEERING - Rok 2015

This study examines the possible effect of the record ice jam of 1984 in the St. Clair River on river bed changes and conveyance. Numerical simulations were made to examine the flow and bed shear stresses during the jam formation and release periods. Simulation results indicate that the ice jam in the river did not cause a significant increase in bed shear stress compared to pre- and post-jam open water conditions. The insignificant...

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Numerical simulation of screw displacement pile interaction with non-cohesive soil

Publikacja

A. Krasiński

- Archives of Civil and Mechanical Engineering - Rok 2014

A trial numerical simulation of screw displacement pile interaction with non-cohesive subsoil during the transfer of compression load. The simulation was carried out in an axisymmetric system. The technological phases of pile installation in the ground were numerically modelled using equivalent processes which provided similar effects to real technical actions. The results of the numerical calculations were verified by comparing...

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STABILITY AND LOAD BEARING CAPACITY OF A BARS WITH BUILT UP CROSS SECTION AND ELASTIC SUPPORTS

Publikacja

M. Krajewski

- Civil and Environmental Engineering Reports - Rok 2015

The present paper is devoted to the numerical analysis and experimental tests of compressed bars with built–up cross section which are commonly used as a top chord of the roof trusses. The significant impact on carrying capacity for that kind of elements in case of out-of-plane buckling is appropriate choice of battens which are used to provide interaction between separate members. Linear buckling analysis results and nonlinear static...

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APPLYING RANSAC ALGORITHM FOR FITTING SCANNING STRIPS FROM AIRBORNE LASER SCANNING

Publikacja

W. Błaszczak-bąk
J. Janicka
A. Sobieraj-Żłobińska

- Civil and Environmental Engineering Reports - Rok 2016

During the development of the data acquired by airborne laser scanning the important issue is the fitting and georeferencing of ALS point clouds by means of the tie surfaces and the reference planes. The process of scanning strips adjustment is based on mutual integration of point clouds (scanning strips) and their adaptation to the reference planes.In simultaneous adjustment all strips are combined into one geometrically coherent...

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Temperature Impact of Nitrogen Transformation in Technological System: Vertical Flow Constructed Wetland and Polishing Pond

Publikacja

S. Myszograj
F. A. Bydałek

- Civil and Environmental Engineering Reports - Rok 2016

The article describes the results of the research, purpose of which was to evaluate influence of the temperature on the effectiveness of nitrification and denitrification in the sewage treatment system consisting of vertical flow constructed wetland and polishing pond. During the analysed period, the efficiency of removing total nitrogen was low and amounted to 12.7%. In the polishing pond in the summer period, content of total...

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THE COST ANALYSIS OF CORROSION PROTECTION SOLUTIONS FOR STEEL COMPONENTS IN TERMS OF THE OBJECT LIFE CYCLE COST

Publikacja

- Civil and Environmental Engineering Reports - Rok 2017

Steel materials, due to their numerous advantages - high availability, easiness of processing and possibility of almost any shaping are commonly applied in construction for carrying out basic carrier systems and auxiliary structures. However, the major disadvantage of this material is its high corrosion susceptibility, which depends strictly on the local conditions of the facility and the applied type of corrosion protection system....

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Application of the Mathar method to identify internal stress variation in steel as a welding process result

Publikacja

D. Kowalski

- Civil and Environmental Engineering Reports - Rok 2017

The paper deals with the method to identify internal stresses in two-dimensional steel members. Steel members were investigated in the delivery stage and after assembly, by means of electric-arc welding. In order to perform the member assessment two methods to identify the stress variation were applied. The first is a non-destructive measurement method employing local external magnetic field and to detecting the induced voltage,...

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Hydrographic Multisensory Unmanned Watercraft

Publikacja

- KSCE Journal of Civil Engineering - Rok 2018

This article describes the design of the unmanned surface vessel (USV) and the algorithms for planning the trajectories to be followed on measurement missions. The algorithms take account of the dynamically varying impacts of external forces (wind and surface current) on the vessel's motion. Feedback loops enable the counteraction of external factors that cause disturbance to the desired trajectory. The sensors installed on the...

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Modern Material Solutions Applied in Pediatric Facilities

Publikacja

- Architecture Civil Engineering Environment - Rok 2018

New tendencies in forming of the health services functional buildings’ systems shaped along with the emergence of caring for patient’s mental condition in medical sciences. The interior design harmonized with the medical function became an incredibly important feature. This opened up new opportunities for the architecture of health care facilities. A positive architecture’s impact on the user’s well-being is remarkably important...

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HEALTH-AFFIRMING EVERYDAY LANDSCAPES IN SUSTAINABLE CITY. ECO-NEIGHBORHOODS IN FRANCE CASE

Publikacja

M. Trojanowska
A. Sas-Bojarska

- Architecture Civil Engineering Environment - Rok 2018

This paper discusses the close relationship between the concept of health-affirming everyday landscapesand the idea of sustainable city design.The French National program of eco-neighborhood certification ÉcoQuartier is described and the correlation between the concepts of health-affirming landscapes,sustainable cities, and eco-neighborhoods is explained using the example of a selected eco-neighborhood in France.

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HEALTH-AFFIRMING EVERYDAY LANDSCAPES IN SUSTAINABLE CITY. THEORIES AND TOOLS

Publikacja

M. Trojanowska
A. Sas-Bojarska

- Architecture Civil Engineering Environment - Rok 2018

As cities and urban population continue to grow, causing serious threats to public health, the development of health-affirming urban landscapes becomes even more important topic than ever before. The purpose of this paper is to answer the question which qualities of urban landscape make it the health-affirming landscape. In the first part of the paper, a concept of health-affirming landscapes and a modern approach to sustainable...

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Shaping of the workpiece surface in single-disc lapping

Publikacja

- Archives of Civil and Mechanical Engineering - Rok 2002

Shape errors of the tool exert a dominant influence on the shape accuracy of the workpiece. The correlation between flatness errors of the lap and flatness errors of the workpieces was checked experimentally and determined analytically. Computer model of the workpiece shaping by lapping was developed. Evaluation method of the workpiece orientation as well as some simulation results for a lap with shape errors of convexity and cincavity...

3-D finite-difference time-domain modelling of ground penetrating radar for identification of rebars in complex reinforced concrete structures

Publikacja

- Archives of Civil and Mechanical Engineering - Rok 2018

This paper presents numerical and experimental investigations to identify reinforcing bars using the ground penetrating radar (GPR) method. A novel element of the paper is the inspection of different arrangements of reinforcement bars. Two particular problems, i.e. detection of few adjacent transverse bars and detection of a longitudinal bar located over or under transverse reinforcement, have been raised. An attention was also...

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Load-carrying capacity of axially loaded concrete-filled steel tubular columns made of thin tubes

Publikacja

M. Abramski

- Archives of Civil and Mechanical Engineering - Rok 2018

An experimental investigation was conducted on 30 CFST columns. An influence of the following factors on load-carrying capacity of the investigated columns was analyzed: the column slenderness (l1 = 42, l2 = 27 and l3 = 15), the tube thickness (the reinforcement ratio was equal to 4% or 6%), the way of applying the load to CFST columns (through the concrete core or through the entire cross-section), the bond strength between a...

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TRUSS JOINT WITH POSITIVE ECCENTRICITY EXPERIMENTAL RESEARCH

Publikacja

- Civil and Environmental Engineering Reports - Rok 2017

Due to the technological reasons in modern lightweight steel trusses, fabricated from cold- formed sections, positive eccentricities appear in the truss nodes what induce additional forces in the truss chords. To account for the real load-carrying capacity of truss node area the steel structure research in scale 1:1 were conducted. The experiments consisted of two parts: preliminary and proper one, when conclusions from...

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The use of tamping machine for diagnosising the longitudinal forces in rails of CWR track

Publikacja

- Journal of Civil Engineering and Architecture - Rok 2010

W pracy przedstawiono przebieg prowadzonych od kilkunastu lat w Politechnice Gdańskiej badań nad wyznaczaniem sił podłużnych w szynach toru bezstykowego. Opisano skonstruowaną aparaturę pomiarową. Badania eksperymentalne polegały na podnoszeniu, a następnie poprzecznym nasuwaniu rusztu torowego za pomocą podbijarki. Rejestrowano przy tym wartości przemieszczeń toru oraz odkształcenia siłowników hydraulicznych. W rezultacie ostatnich...

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