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Tytuł:
The experimental study of glass multilayer columns using digital image correlation
Autorzy:
Demchyna, B.
Surmai, M.
Tkach, R.
Powiązania:
https://bibliotekanauki.pl/articles/378961.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
laminated glass column/glass multilayer column
digital image correlation
triplex
layer glass
glass column
korelacja obrazu cyfrowego
szkło warstwowe
kolumna szklana
Opis:
Purpose: The purpose of the research is to study the deformability of glass multilayer columns at the central compression using digital image correlation. It becomes possible to use the method of digital image correlation for the experimental study of load bearing building structures of glass. Design/methodology/approach: The approach which has been used to solve the above problems is to conduct an experimental study of glass columns on central compression, in which deformations were measured using digital image correlation. Findings: The possibility of using load bearing building structures of glass triplex has been discovered. A program of experimental studies was developed. It included the testing of prototype samples on central compression with rigid fastening. On the basis of the obtained results, a graph of dependence of relative deformations on normal tension, graphs of the dependence of the bending of columns on load in different planes, and a modulus of elasticity of triplex glass have been determined. Research limitations/implications: The lack of a calculation methodology and regulatory documents for designing load bearing building structures of triplex glass increases their cost, since each project is individual and requires the experimental research. Practical implications: Using the approaches developed in the paper, the method of digital image correlation, which is to measure deformations when testing glass structures on central compression can be applied. Originality/value: The experimental study is probably the first one in which deformations of glass columns are determined using the method of digital image correlation, so it is new and original. The lack of a calculation methodology and regulatory documents for designing load bearing building structures of triplex glass, increases their cost, since each project is individual and requires the experimental research.
Źródło:
Archives of Materials Science and Engineering; 2019, 96, 1; 32-41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on gas holdup characteristics of micro-bubble countercurrent contacting flotation column
Autorzy:
Han, Jikang
Wang, Weizhi
Li, Ran
Powiązania:
https://bibliotekanauki.pl/articles/1449071.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
column flotation
conductance method
pressure drop method
gas holdup
GE-609
Opis:
In order to explore the gas holdup distribution of the microbubble countercurrent contact flotation column in the hematite column cationic reverse flotation process, respectively using conductance method and pressure drop method for air and water as experimental medium characteristics research of flotation column, the research group carries on the gas holdup, examines the aeration quantity, the fill medium and cation collector alkyl polyamine ether (An amine collector―GE609 which consists of four elements: carbon, hydrogen, oxygen and nitrogen)within the column on the influence of the axial and radial gas holdup. The results show that the axial gas holdup from the bottom of the column to the top of the column increases with the increase of height in the range of 0.050.07dm3/s. The radial distribution of gas holdup generally shows the distribution law of “intermediate high, low on both sides”. After the filling medium is added into the column, the radial gas holdup is evenly distributed compared with the empty column, and the gas holdup is increased. Due to the high foaming performance of GE-609, the gas holdup in the column can be increased by changing the amount of aeration and the concentration of the reagent, which can exceed 60% at the maximum. Like other alcohol foaming agents, as time passes, the effect of GE-609 weakens and the gas holdup in the column gradually decreases. The addition of quantitative HCl can improve the foaming performance of GE-609, and the gas holdup in the column is significantly improved and the stability is enhanced.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 4; 665-675
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Effectiveness of Using Column-Oriented Databases in the Processing of Measurement Characteristics of an Electric Vehicle
Autorzy:
Czerepicki, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/223980.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric vehicle
measurement characteristics
IT transport systems
NoSQL database
pojazd elektryczny
charakterystyki pomiarowe
system transportu IT
baza danych NoSQL
Opis:
Electric vehicles are increasingly popular means of transport. One of the most important problems of their operation is to optimize the use of a battery pack. It requires to analyze the operational characteristics of a vehicle in motion, which are stored in a database. If the measurement data are collected from many vehicles, the efficiency of their analysis is important. The objective of this article is to study the possibilities of using modern column-oriented databases in order to increase the efficiency of the analysis of selected operational characteristics of an electric vehicle. The research problem is a comparative analysis of the processing efficiency of selected measurement characteristics of an electric vehicle in relational and column-oriented data structures. Important analytical functions were formulated and recorded in the form of database queries. An experiment consisting in multiple execution of functions packages on various database structures, including a column-oriented one, was carried out. The execution time of packages and the IT system load were collected and analyzed. The analysis of the experiment results allows to conclude that the use of the column-oriented data structures made it possible to shorten the time of executing the functions analyzing the energy consumption by the electric vehicle’s drive system. Depending on the type of the analyzed characteristics of the vehicle and its method of representation in the database, a significant reduction of the analysis time compared to the relational structure was obtained. Also, a decrease in the load on the computer system during data processing on the column-oriented structures was noted. The use of the column-oriented databases in the processing and analysis of measurement operational characteristics of electric vehicles is justified and it can bring measurable effects. It should be considered that the effectiveness of solving depends on the number of the analyzed characteristics and the format of their representation in the computer.
Źródło:
Archives of Transport; 2019, 51, 3; 77-84
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on bubble characteristics of flotation column in hematite reverse cationic flotation process
Autorzy:
Wang, Weizhi
Han, Jikang
Powiązania:
https://bibliotekanauki.pl/articles/1450070.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
column flotation
bubble generator
GE-609
circularity
bubble diameter
bubble Sauter diameter
Opis:
In the self-designed flotation column simulation system, the foaming characteristics of the micro-bubble countercurrent contact flotation column used in the hematite cation column flotation process are systematically studied. The objective of this study is to investigate the bubble generation by a bubble generator in the flotation column. The bubble image was obtained by the high-speed camera recorder, and the bubble diameter was calculated and analyzed by image processing software. The distribution characteristics of the bubble size under different aeration conditions and with different reagent concentrations were investigated. The results show that as the aeration increases, the average diameter bubbles increases, the bubble size distribution changes from narrow to wide, and the number of small bubbles decreases. The cationic collector GE-609 can change the bubble shape. As the concentration increases, the bubble shape gradually changes from an irregular shape to a standard spherical shape. When the concentration of GE-609 exceeds 2.5 mg/dm3, the average circularity C of the bubbles in the bubble group stabilizes at 1, and the increase in concentration no longer changes the bubble shape. GE-609 also has an efficient foaming effect, as the concentration increases, the bubble diameter distribution changes significantly, the proportion of small bubbles increases, and the proportion of large bubbles decreases significantly. When the critical concentration is exceeded, the bubble diameter distribution probability density peak width no longer changes significantly. Compared with the two types of alcohol foaming agents, GE-609 produces a bubble Sauter diameter close to that of 2-octanol and slightly lower than terpineol.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 1; 64-75
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the cohesive soil stiffness in a modified resonant column
Badanie sztywności gruntu spoistego w zmodyfikowanej kolumnie rezonansowej
Autorzy:
Sas, W.
Soból, E.
Gabryś, K.
Markowska-Lech, K.
Powiązania:
https://bibliotekanauki.pl/articles/394989.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
kolumna rezonansowa
grunt spoisty
moduł ścinania
ścinanie skrętne
piezoelementy rodzaju bender
resonant column
cohesive soil
shear modulus
torsional shear
bender elements
Opis:
The expansion of cities encourages designers and engineers to build increasingly sophisticated skyscrapers and underground structures. Such complicated projects require more reliable soils parameters. Dynamic parameters of the soils are commonly used for the purposes of civil engineering design. The resonant column is one of the most reliable devices allowing the above-mentioned soil properties to be obtained. In this article, the authors studied a dynamic parameter shear modulus G of the cohesive soil clayey sand. Researchers conducted their own examination, using a modified resonant column, which is equipped with bender elements and a torsional shear device. The studied material was an undisturbed cylindrical sample of the cohesive soil clayey sand (clSa) from a depth of 6 m from the village of Kociszew. In order to calculate the maximum shear modulus, the authors have employed two types of time-domain techniques to measure shear wave velocities, namely the first peak to peak and start-to-start methods. In bender elements test authors investigate shear wave velocity in a range of period from 0.01 to 0.1 ms and 14 V amplitude, which gave a wave length from about 0.1 to 3.5 cm. In the case of torsional shear tests, researchers examined ten cycles of sinusoidal torsional excitation with 1 Hz frequencies and amplitude from 0.004 to 1 V. The research performed indicated that the results obtained by using the torsional shear and first peak to peak methods are in very good agreement, while the overestimation of the results obtained by using the start-to-start method reached up to 27%.
Rozwój miast wymusza na projektantach i wykonawcach budowanie coraz wyższych wieżowców, a także coraz bardziej skomplikowanych konstrukcji podziemnych. Dla tak wyrafinowanych projektów potrzebne są jak najbardziej wiarygodne parametry gruntowe. W dzisiejszych czasach inżynierowie powszechnie korzystają z dynamicznych parametrów gruntu. Jednym z najpopularniejszych i jednocześnie najbardziej wiarygodnych aparatów do uzyskiwania wspomnianych wyżej właściwości jest kolumna rezonansowa. W tym artykule autorzy zbadali dynamiczny parametr jakim jest moduł ścinania. Badania zostały przeprowadzone na nienaruszonej cylindrycznej próbce piasku ilastego (clSa), która pochodziła z 6 m głębokości z miejscowości Kociszew. Autorzy prowadzili badania w zmodyfikowanej kolumnie rezonansowej, która wyposażona jest zarówno w piezoelementy rodzaju bender jak i urządzenie do ścinania skrętnego. Użyto dwóch metod do interpretacji sygnału w odbiorniku w testach piezoelementami rodzaju bender, mianowicie technikę „pierwszego szczytu” i metodę „od startu do startu”. W testach elementami bender przebadano fale porzeczne o okresie około 0,01 do 0,1 ms i amplitudzie 14 V, co przełożyło się na długość fal od około 0,1 do 3,5 cm. W badaniu ścinania skrętnego użyto 10 cykli sinusoidalnego wzbudzania o częstotliwości 1 Hz i amplitudzie od 0,004 do 1 V. Z prze- prowadzonych badań wynika, ze wyniki uzyskane metodą „pierwszego szczytu” pokrywały się z tymi uzyskanymi za pomocą ścinania skrętnego, natomiast metoda „od startu do startu” zawyżała wyniki nawet do 27%.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2016, 93; 21-33
2080-0819
Pojawia się w:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of deuteron motion in a filamentary Plasma-Focus pinch column for different configurations of filaments
Autorzy:
Pasternak, A.
Sadowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/146934.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
deuterons
filamentary pinch
ion trajectories
numerical modeling
plasma focus
Opis:
The motion of deuterons in dynamical filamentary configurations of a PF pinch column has been studied with a three-dimensional numerical model. Apart from magnetic fields, the motion-induced electrical fields as well as ion-ion and ion-electron collisions have been included in the equations of deuteron motion. Calculations were performed for different numbers of filaments and its spatial distributions under different initial conditions. Energy of ions was assumed to be from 10 keV up to 200 keV. The results obtained have shown many possible modes of ion motion and have demonstrated that the current filaments can cause peculiarities observed in the angular distribution of deuterons emitted from the PF pinch column.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 29-32
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress-strain model study of ferrous tailing concrete short column restraint by hooping
Autorzy:
Li, Sujuan
Kang, Hongzhen
Powiązania:
https://bibliotekanauki.pl/articles/972321.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
ferrous tailing
restraint concrete
short column
stress-strain model
Opis:
This study analyzed the stress–strain curve of stirrup restraint ferrous tailing concrete by test and theoretical analysis. Twenty short column in strength grade 5 are used in the test with WC30, WC35, WC40, WC45 and WC50. The stress–strain data is achieved after the axial compression behavior test. It is found from the stress–strain curve that the stress–strain relationship is similar with natural sand concrete. Moreover, the whole stress–strain curve equation of stirrup restraint ferrous tailing concrete is put forward. The calculation results show that the data calculating by the equation are in good agreement with the experimental data.
Źródło:
Mining Science; 2019, 26; 241-248
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of the thin-walled angle column made of bio-laminate versus glass-laminate under axial compression – numerical study
Autorzy:
Gawryluk, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/27309877.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
bio-laminates
buckling
thin-walled structures
FEM
eigenproblem
biolaminat
wyboczenie
konstrukcje cienkościenne
MES
problem własny
Opis:
The aim of this study was to determine how the change of glass laminate fibres to flax fibres will affect the stability of thin-walled angle columns. Numerical analyses were conducted by the finite element method. Short L-shaped columns with different configurations of reinforcing fibres and geometric parameters were tested. The axially compressed structures were simply supported on both ends. The lowest two bifurcation loads and their corresponding eigenmodes were determined. Several configurations of unidirectional fibre arrangement were tested. Moreover, the influence of a flange width change by ±100% and a column length change by ±33% on the bifurcation load of the compressed structure was determined. It was found that glass laminate could be successfully replaced with a bio-laminate with flax fibres. Similar results were obtained for both materials. For the same configuration of fibre arrangement, the flax laminate showed a lower sensitivity to the change in flange width than the glass material. However, the flax laminate column showed a greater sensitivity to changes in length than the glass laminate one. In a follow-up study, selected configurations will be tested experimentally.
Źródło:
Archive of Mechanical Engineering; 2023, LXX, 1; 43--61
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance analysis of cation and anion exchangers in water treatment plant: an industrial case study
Autorzy:
Ramzan, N.
Feroze, N.
Kazmi, M.
Ashraf, M. A.
Hasan, S.
Powiązania:
https://bibliotekanauki.pl/articles/779735.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
krzywa przebicia
wymiana jonowa
uzdatnianie wody
breakthrough curves
degree of column utilization
ion exchange
water treatment
Opis:
Performance of cation and anion exchangers was evaluated by carrying out breakthrough analyses of pH, conductivity, free mineral acid (FMA) and various dissolved solids for an industrial water treatment plant of 700 gpm capacity. The breakthrough curves showed no leakage of calcium, magnesium and chloride throughout the operating period of the train, however, they indicated the early leakage of sodium, potassium, sulphate and silica. The operating/breakthrough capacity, total capacity and degree of column utilization were determined. The column utilization was found to be 67.85%, 38.93% and 16.78% against the design values of 90%, 85% and 85% for cation, primary and secondary anion exchangers respectively. The operating time of the water treatment train was significantly increased by achieving adequate capacity utilization of secondary anion exchanger. The low capacity utilization of secondary anion resin due to early silica slippage, has been discussed in the paper.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 2; 35-41
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packed bed column adsorption of oil and grease from refinery desalter effluent, using rice husks derived carbon as the adsorbent: Influence of process parameters and Bohart–Adams kinetics study
Autorzy:
Umembamalu, Chinedu Josiah
Igwegbe, Chinenye Adaobi
Osuagwu, Emmanuel Ugochukwu
Nwabanne, Joseph Tagbo
Powiązania:
https://bibliotekanauki.pl/articles/1031584.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adsorption
Bohart–Adams kinetics
Crude oil
Oil and grease
Packed bed column
desalter effluent
Opis:
Oil and grease (O&G) adsorption in a packed bed column, using adsorbent prepared from rice husks wastes, was investigated. The effects of adsorbent particle size (150, 300, and 600 µm), initial adsorbate concentration (200, 300, and 400 mg/L), and bed height (100, 200, and 300 mm) on the performance of column adsorption for O&G removal and breakthrough time were investigated in the packed column experiments at a constant flow rate of 10.5 mL/min. The kinetic behavior of the column adsorption process was analyzed using the Bohart–Adams model. The kinetic data fitted the model very well. The rate constant (mass transfer coefficient) for Bohart–Adams model (KAB) increased with the decrease in adsorbent particle size and initial ion concentration but was higher at the bed height of 200 mm. The maximum adsorption capacity (No) increased with a decrease in particle size and initial ion concentration but increased with an increase in the bed height. The rate constant for Bohart–Adams model decreased with an increase in adsorbent size and initial concentration, and was higher at the bed height of 200 mm. The time required for 90% breakthrough decreased with increase in the flow rate, bed height, and initial ion concentration. The model results of the O&G breakthrough curve concentration have shown a fairly good agreement with experimental results. This analysis, considering the adsorbent’s particle size, feed concentration, and bed heights indicated that the packed bed unit could be used for the treatment of O&G effluent to reduce the difficulties of oil refineries in Nigeria and other countries.
Źródło:
World News of Natural Sciences; 2020, 31; 155-174
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study on the dynamic response of a concrete filled steel tubular long column under axial impact by a rigid-body
Autorzy:
Qi, Han
Chen, Shuohui
Zou, Jianlei
Zhang, Huidi
Liu, Mengsha
Ju, Jinsan
Sang, Xiuxing
Powiązania:
https://bibliotekanauki.pl/articles/2055059.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
concrete filled steel tubular long column
rigid body
impact load
dynamic response
Opis:
In this study, refined finite element models of concrete filled steel tubular long columns with length diameter ratio (L/D) of 50 were established, and their dynamic responses under a rigid-body impact were explored. It is found that the form of impact load is only related to and can be predicted from the impact velocity of the rigid-body. The change of axial stress and strain with time is synchronous with that of the impact load. Furthermore, the variation characteristics of axial stress and strain with time are mainly related to the initial velocity of the rigid-body.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 4; 551--563
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study on extraction of tritium generated in HMR by way of system composed of EXEL-process and thermal diffusion column cascade
Autorzy:
Shimizu, M.
Takeshita, K.
Powiązania:
https://bibliotekanauki.pl/articles/146995.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
chemical exchange reaction
heavy water
isotope separation
thermal diffusion
trickel-bed reactor
tritium
Opis:
A new tritium extraction system composed of a trickle-bed hydrogen/water isotopic exchange column using a hydrophobic Pt-catalyst combined with an SPE-water electrolyser (EXEL-process) and a thermal diffusion column cascade was proposed for the removal of tritium from heavy water irradiated in HMR ((Heavy Water Moderated Power Reactor), volume of heavy water = 140 m3 and mean neutron flux = 5×1013 n/cm2s). Numerical study on the extraction of tritium from the heavy water was carried out and the dimensions of proposed system were determined under the conditions that the concentration of tritium in the heavy water was kept less than 2.5 Ci/lHW. The calculation results indicated that the proposed system was designed practically.
Źródło:
Nukleonika; 2002, 47,suppl.1; 89-93
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
News Values vs. Gospel Values. Religious messages in the media – case study of celebrity gossip column “Virtues and Vices”
Wartości newsa a wartości ewangelii. Przekazy religijne w mediach – studium przypadku plotkarskiej kolumny „Cnoty i wady”
Autorzy:
Rončáková, Terézia
Powiązania:
https://bibliotekanauki.pl/articles/30113661.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Papieski Jana Pawła II w Krakowie
Tematy:
news
wartości w mediach
przekazy religijne
týždeň
cnoty
wady
media values
religious messages
virtues
vices
Opis:
News Values vs. Gospel Values. Religious messages in the media – case study of celebrity gossip column “Virtues and Vices”. By conveying religious messages through a media communication channel, researches often point to the “news non-value” of religious events. This is a conflict between “news values” (headed by conflict) and “gospel values” (which are Christian virtues). However, some religious topics are also interesting for the secular media. Among them, the most popular are the stories and fortunes of well-known people (and their private lives). The Slovak weekly, “.týždeň”, has published a regular column of Virtues and Vices, since 2011, in which celebrities – including many Christians – openly talk about their strengths and weaknesses. This study offers a content analysis of the presented virtues and vices; answering the question, what (Christian) virtues and their negations are of interest to the secular media?
Wartości newsa a wartości ewangelii. Przekazy religijne w mediach – studium przypadku plotkarskiej kolumny „Cnoty i wady”. Analizując przekazy religijne w mediach świeckich, badacze mediów wskazują na zjawisko dysonansu pomiędzy wartościami ewangelicznymi a newsowym charakterem tych przekazów. Tematy religijne są coraz częściej przedmiotem przekazów w mediach świeckich. Wśród nich popularne są historie i losy znanych osób (oraz ich życie prywatne). Słowacki tygodnik „.týždeň” od 2011 roku regularnie publikuje kolumnę „Cnót i przywar”, w której celebryci – w tym wielu chrześcijan – otwarcie mówią o swoich mocnych i słabych stronach. Niniejsze opracowanie zawiera analizę treści przedstawionych w nich cnót i wad, odpowiadając na pytanie, jakie chrześcijańskie cnoty i ich negacje interesują świeckie media.
Źródło:
Studia Socialia Cracoviensia; 2019, 11, 2; 43-54
2080-6604
Pojawia się w:
Studia Socialia Cracoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Naprężenia własne w spawanych słupach skrzynkowych z kształtowników profilowanych na zimno
Residual stresses in welded box columns from cold-formed sections
Autorzy:
Gierczak, Jan
Ignatowicz, Rajmund Leszek
Powiązania:
https://bibliotekanauki.pl/articles/128770.pdf
Data publikacji:
2020
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
naprężenia własne
słup skrzynkowy
konstrukcja stalowa
kształtownik gięty na zimno
ksztatownik cienkościenny
badanie doświadczalne
residual stresses
box column
steel structure
cold formed section
thin-walled profile
experimental study
Opis:
W pracy przedstawiono wyniki badań doświadczalnych mających na celu określenie wielkości i rozkłady naprężeń własnych w typowych słupach skrzynkowych spawanych z kształtowników profilowanych na zimno. Badania wykonano metodą trepanacyjną, rejestrując zmianę stanu odkształceń po rozcięciu na paski modelu krótkiego słupa. Wyniki badań porównano z rezultatami innych badaczy i mogą one stanowić podstawę do dalszych analiz stateczności ścian słupa skrzynkowego z uwzględnieniem naprężeń własnych.
The paper presents the results of investigations aimed at determining the size and distribution of residual stresses in box columns welded from cold-formed sections. Trepanation method (strip cutting method) is used to determine the change in the state of deformation after cutting into strips of the short column model. The results were compared with the results of other researchers and may form the basis for further analyses of the stability of the walls of the box column, taking into account the natural stresses.
Źródło:
Builder; 2020, 24, 1; 19-23
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory investigations of diclofenac migration in saturated porous media - a case study
Autorzy:
Okońska, Monika
Marciniak, Marek
Zembrzuska, Joanna
Kaczmarek, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/94508.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
non-steroidal anti-inflammatory drugs
column tests
parameter estimation
optimisation method
MATLAB
niesteroidowe leki przeciwzapalne
test kolumnowy
identyfikacja parametrów
metody optymalizacji
Opis:
At present, concentrations of pharmaceuticals in surface and ground waters are low; however, even low concentrations of certain substances may prove very harmful. One of such pharmaceutical drugs is diclofenac, a popular non-steroidal anti-inflammatory drug (NSAID). For this reason, it is important to determine its mobility in groundwater and to estimate parameters of migration. Authors conducted column tests for two porous media: an artificial one, consisting of glass granules, and a natural one, i.e., sandur sand obtained from a site north of the city of Poznań (Poland). During the test, impulse breakthrough curves of chloride ions and diclofenac were recorded. The results were used to identify a specific sorption model and to determine values of migration parameters. Solutions of the inverse problem using optimisation methods and of equations of mathematical migration models were carried out in a MATLAB environment. Based on test results, the mobility of diclofenac is shown to be very high and comparable to that of chloride ions. The tests also revealed a slight and irreversible sorption of diclofenac on grains of both porous media.
Źródło:
Geologos; 2019, 25, 3; 213-223
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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