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1
Content available remote Investigations on tensile and flexural characteristics of fly ash and banana fiber-rein
100%
Gopalan V. , Sharma S. K. , Jangid A. K. , Pragasam V. , Satonkar N. , Chinnaiyan P.
Engineering Transactions
|
2020
|
tom Vol. 68, iss. 1
89--101
EN
Polymer matrix composites (PMCs) generally use the inorganic and non-biodegradable materials as reinforcements. This paper presents a PMC with reinforcement of fly ash and banana fiber. The epoxy resin is used as a matrix. This paper investigates the influences of the percentage of fly ash, the percentage of banana fiber and the size of banana fiber on tensile and flexural behaviors of fly ash and banana fiber reinforced epoxy matrix composite. Taguchi’s orthogonal array is used in the design of the experiments in the sample preparations. Analysis of variance (ANOVA) is employed to find the significance of input parameters on tensile and flexural behaviors.
2
Content available Lateral Earth Pressure in Non-Cohesive Soils, Reinforced with Geotextiles in the Light of Laboratory Research
100%
Surowiecki A.
Logistics and Transport
|
2016
|
tom 32
81-88
EN
The subject of the paper is the non-cohesive medium layer with geotextiles reinforced as foundation in communication building engineering. The influence of horizontal bidirectional reinforcement on the change of value of horizontal pressure in the laboratory physical models of ground medium layer is estimated. The most important effects reinforcement have been observed, regarding increasing model load capacity.
3
Content available Lateral Earth Pressure in Non-Cohesive Soils, Reinforced with Geotextiles in the Light of Laboratory Research
100%
Surowiecki A.
Logistics and Transport
|
2016
|
tom Vol. 32, No. 4
81--88
EN
The subject of the paper is the non-cohesive medium layer with geotextiles reinforced as foundation in communication building engineering. The influence of horizontal bidirectional reinforcement on the change of value of horizontal pressure in the laboratory physical models of ground medium layer is estimated. The most important effects reinforcement have been observed, regarding increasing model load capacity.
4
Metodyka określania podstawowych parametrów MEW oraz analiza stosowanych umocnień na górnym i dolnym stanowisku
100%
Walczak N. , Hammerling M. , Walczak Z.
Gospodarka Wodna
|
2015
|
tom Nr 5
140--146
PL
Budowa elektrowni wodnych na istniejących stopniach wodnych może nieść więcej korzyści niż potencjalnych szkód. Piętrzenie wody na górnym stanowisku może być wykorzystywane energetycznie bez negatywnego wpływu na zagrożenie ekologiczne środowiska przyrodniczego. Dodatkowo należy zwrócić uwagę na korzystanie w ten sposób z odnawialnych źródeł energii, których pozyskiwanie jest obecnie bardzo ważne. Dostępność i możliwość zastosowania materiałów proekologicznych w celu umocnienia górnego i dolnego stanowiska poprawia nie tylko stronę wizualną, ale i ogranicza niepożądane procesy morfologiczne wywołane zaburzeniem warunków przepływu. W artykule przedstawiono przykładowy schemat doboru parametrów technicznych elektrowni wodnej oraz przegląd materiałów wykorzystanych do umocnienia górnego i dolnego stanowiska.
EN
Construction of hydroelectric power plants on the existing water bar-rages may bring more benefits than potential damages. Damming water in the upper station may be used for power generation purposes without constituting an ecological threat to the natural environment. Moreover, it should be streesed that the power thus generated originates from renewable energy sources, what is very important nowadays. Availability and possibility to use pro-ecological materials in order to reinforce the upper and the bottom station brings not only aesthetic improvements but also reduces undesirable morphological processes resulting from disturbance of the flow conditions. The article presents an example choice of a hydroelectric power plant technical parameters and a review of materials used for reinforcement of the upper and the bottom station.
5
Content available Modern concrete pipes: a review of reinforcement and new technologies
100%
Abel T. , Pelczar N.
Studia Geotechnica et Mechanica
|
2021
|
tom Vol. 43, nr s1
548--557
EN
The paper discusses existing reinforcement, future reinforcement and new technologies for concrete pipes used in the sewage systems. Concrete pipes currently in use and under investigation are reviewed. Structural fibres, as the main reinforcement of concrete pipes, are known as an attractive alternative to the traditional steel bars. Steel, synthetic and basalt fibres have been considered. The latest research and mechanical properties of individual fibres are presented. Advances in fibre-reinforced concrete provide a new basis for the design of more efficient concrete pipes, especially those resistant to biological corrosion and with a longer service life. In the article, future non-corrosive reinforcement due to the reduction of steel reinforcement and corrosion protection linings has been proposed.
6
Monitoring the effects of an education for peace program: An Israeli perspective
100%
Arnon M. , Galily Y.
Human Affairs
|
2014
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tom 24
|
nr 4
531-544
EN
The aim of the current study was to monitor the changes that individual participants experienced as a result of taking part in a peace education program. The findings of prior analyses led to the understanding that participating in a peace program does not always ensure positive changes and may even cause a regression in attitudes. The present study was conducted in two stages. In the first stage, the researchers learned about the processes that participants underwent during a peace education program and accordingly, a reinforcement program to restore/rehabilitate any negative attitudes was formed. In the second stage, the effectiveness over time of this reinforcement program was evaluated. The study’s findings show that engaging in reflection about the workshop content, especially when it is oriented towards positive thinking, is effective in reinforcing attitudes among participants who underwent a positive change in attitudes, and at the same time helps to rehabilitate attitudes among those participants who underwent a negative change. It is recommended that future peace education programs include at least three parts: preliminary preparation, the program itself, and follow-up/reinforcement activity after completion of the program.
7
Content available A Study on the Influence of Reinforcement Volume on AA5083/(SiC-Gr) Hybrid Surface Composite Developed by Friction Stir Processing
88%
Bharti S. , Ghetiya N. D. , Patel K. M. , Saxena K. K.
Archives of Metallurgy and Materials
|
2023
|
tom Vol. 68, iss. 2
625--629
EN
In this study, a hybrid surface composite of AA5083/SiC-Gr was produced by Friction Stir Processing (FSP). Reinforcement material each in 50:50 proportion was filled in the base matrix using holes method. Three different hybrid reinforcement volumes of 301.6 mm3, 452.4 mm3, and 603.2 mm3 were prepared for surface composite. Optical and Scanning Electron Microscopy was used to check the quality of the prepared surface composite and homogeneous distribution of reinforcement was observed in the images. It was observed that due to better uniform distribution of reinforcement particles during 3 pass FSP, specimens with 301.6 mm3 reinforcement volume showed enhanced microhardness and wear properties in comparison with the other specimens.
8
Content available remote Numerical analysis of behaviour of reinforced concrete elements under eccentric compression
88%
Majewski T. , Tejchman J.
TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
|
2002
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tom Vol. 6, No 3
411-428
EN
Paper presents results of numerical modelling of behaviour of plane strain reinforced concrete elements under eccentric compression. In the analysis, a finite element method was used based on an elasto-plastic constitutive law by Drucker-Prager with hardening and softening for concrete and an elasto-plastic constitutive law by von Mises for reinforcement. The effects of boundary conditions at the element ends, eccentricity of the compressive load, element slenderness, area of the longitudinal and horizontal reinforcement on the load bearing capacity of elements were studied. The effect of the mesh refinement on the bearing capacity of elements was also analysed. A satisfactory agreement with model tests was achieved.
9
Content available Utilization of Eco-Friendly Rice Husk Ash Waste as Reinforcement in LDPE Thermoplastics
88%
Ginting E. M. , Motlan , Sani R. A. , Bukit N. , Bukit B. F.
Ecological Engineering & Environmental Technology
|
2023
|
tom Vol. 24, iss. 8
240--246
EN
The topic of environmental contamination is currently regarded as one of the most urgent and significant challenges in contemporary society. Several strategies must be implemented to mitigate the environmental impact caused by waste materials, such as to rice husks ash, plastic, and other materials. Low-density polyethylene is widely recognized in academic circles for its distinctive property of having a low melting point and demonstrating inferior thermal stability. However, the utilization of RHA has promise for augmenting the thermal LDPE. The inclusion of silica inside rice husk ash functions as a flame retardant, hence augmenting the material’s capacity to resist combustion and thermal degradation. The objective of this study is to utilization of eco-friendly RHA waste as reinforcement in LDPE thermoplastics. RHA is produced by the coprecipitation process. Rheomixer is used to make thermoplastic composites by incorporate RHA into LDPE 0, 2, 4, 6, 8, and 10 wt.%. The micrograph of the failure surface of the composite material consisting of LDPE filled with reactive hot-melt adhesive RHA particles reveals significant variations in particle sizes. In adittion XRD graph showed a decrease in intensity when 6% wt and 8% wt RHA were added. The results of thermal analysis with DSC showed an increase in the melting point of the sample with RHA reinforcement from 108.96–109.21o C and 482.47–500.09oC. The incorporation of RHA as a reinforcement in LDPE holds promise for its utilization as a material possessing favorable thermal characteristics suitable for industrial applications such as pipes and protective coatings, which required enhanced thermal resistance. The utilization of rice husk ash (RHA) waste imposes both environmental and economic impacts. RHA has the potential to reduce environmental pollution caused by waste and decrease the costs involved in material production.
10
Content available Wpływ rozkładu obciążenia ekwiwalentnego na zachowanie membrany modelującej zbrojenie warstwy transmisyjnej
88%
Gajewska B. , Gajewski M.
Acta Scientiarum Polonorum. Architectura
|
2020
|
tom 19
|
nr 2
PL
Rozkład obciążenia zastępczego w analizie zbrojenia warstwy transmisyjnej nasypów na słabym podłożu wzmocnionym kolumnami ma wpływ na zachowanie membrany modelującej to zbrojenie. W zależności od modelu obliczeniowego powszechnie stosowane są rozkłady trójkątny, równomierny i odwrotny trójkątny. W pracy przeanalizowano zachowanie membrany pod wpływem 11 różnych rozkładów obciążenia. Dla wszystkich rozkładów wyznaczono krzywe ugięcia oraz wykresy sił rozciągających, odkształceń i kąta obrotu membrany dla zadania modelującego eksperyment w skali rzeczywistej. Przeprowadzono także analizę wpływu współczynnika sztywności k słabego podłoża między kolumnami oraz sztywności zbrojenia na zachowanie membrany. Stwierdzono, że przyjęcie jednego z rozkładów jako odpowiedni w każdej sytuacji projektowej nie zawsze jest uzasadnione. W pracy wykazano, że stosunek odporu gruntu do sztywności zbrojenia ma istotny wpływ na charakter funkcji i wartości ekstremalne sił wewnętrznych, odkształceń i ugięć. W wyniku przeprowadzonych analiz wykazano, że zwiększanie sztywności gruntu (parametr k) zmienia w sposób istotny charakter funkcji ugięcia, odkształcenia i siły normalnej w membranie, a zmiana ta zależy od rozkładu obciążenia zastępczego.
EN
The distribution of the equivalent load in the analysis of the reinforcement of an embankment load transfer platform on a soft soil reinforced with columns has an impact on the behaviour of the membrane modelling this reinforcement. Depending on the calculation model, triangular, uniform and inverse triangular distributions are commonly used. The paper analyses the behaviour of the membrane under the influence of 11 different load distributions. For all distributions, deflection curves and diagrams of tensile forces, deformation and the angle of rotation of the membrane were determined for the task of modelling the full-scale experiment. An analysis of the influence of the subgrade reaction modulus (k value) of the soft soil between the columns and the reinforcement stiffness on the membrane behaviour was also carried out. It was found that the adoption of one of the load distributions as suitable in every design situation is not always justified. As a result of the analyses, it has been shown that increasing soil stiffness (k value) significantly changes the nature of the function of deflection, deformation and normal force in the membrane, and this change depends on the distribution of the equivalent load.
11
Content available remote Ultra-high crystallinity millimeter long multiwall carbon nanotubes fabricated by mechanothermal method
88%
Manafi S. A. , Rahimipour M. R. , Soltanmoradi A.
Materials Science Poland
|
2012
|
tom Vol. 30, No. 3
226--230
EN
In this work, multi-walled carbon nanotubes (MWCNTs) with ultra-high crystalline structure have been prepared by mechanothermal (MT) method. The novel super nanostructure is introduced for the first time as an extraordinary fullerene-carbon based material which, due to its special electronic and mechanical properties, can be used to construct unique building blocks for nanoengineering. Initially, high ultra-active graphite powder has been obtained by mechanical activation under Ar atmosphere. Finally, the mechanically activated product is heat-treated at 1350 °C for 3-4 h under an Ar gas flow. However, the crystallite size and crystallinity degree of the MWCNTs increased with the increase in annealing temperature.
12
Content available Fabrication of Aluminum Matrix Composite Reinforced with Al0.5CoCrCuFeNi High-Entropy Alloy Particles
88%
Kim M. S. , Son H. S. , Joo G. S. , Kim Y. D. , Choi H. J. , Kim S. H.
Archives of Metallurgy and Materials
|
2022
|
tom Vol. 67, iss. 4
1543--1546
EN
The aluminum composite with dispersed high entropy alloy were developed by stir casting involving the powder-in-tube method. First, Al0.5CoCrCuFeNi high entropy alloy (HEA) powder was made by mechanical alloying, and the powder was extruded in a tube-type aluminum container to form HEA precursor. The extruded HEA precursor was then dispersed in the aluminum matrix via stir casting. As a result, Fe-Cr-Ni based high-entropy phases was uniformly formed in the aluminum matrix, revealing ~158, 166, 235% enhancement of tensile strength by incorporating 1, 3, and 5 wt% HEA particles, respectively.
13
Content available Construction disasters caused by punching in the support zone of reinforced concrete slab-and-column ceilings as well as means of their repair and reinforcement
88%
Kobielak S. , Hutnik E. , Zamiar Z.
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
|
2016
|
tom Nr 1
151--167
EN
Slab-and-column ceilings are widely used because of the considerable savings that they allow to obtain in the total construction cost. However, this structural system has a weak feature that consists of vulnerability to punching in a ceiling slab around its connection to a column. This paper describes several examples of disasters caused by slab punching and gives conclusions resulting therefrom. In order to eliminate the problem of punching, in the world there are used various types of shear reinforcement in a slab around a column, which are characterized by malleability and puncture resistance, thereby preventing a disaster. Examples of such reinforcement of ceiling slabs around columns are also shown in the work.
14
Content available Metody rascheta rabochejj armatury kolonn zhelezobetonnykh konstrukcijj, rabotajushhikh v uslovijakh ciklicheskogo nagruzhenija
88%
Azhermachev G. , Mennanov E. , Shevchenko N.
Motrol. Motoryzacja i Energetyka Rolnictwa
|
2013
|
tom 15
|
nr 5
15
Content available Selective maintenance optimization with stochastic break duration based on reinforcement learning
88%
Liu Y. , Qian X.
Eksploatacja i Niezawodność
|
2022
|
tom Vol. 24, no. 4
771--784
EN
For industrial and military applications, a sequence of missions would be performed with a limited break between two adjacent missions. To improve the system reliability, selective maintenance may be performed on components during the break. Most studies on selective maintenance generally use minimal repair and replacement as maintenance actions while break duration is assumed to be deterministic. However, in practical engineering, many maintenance actions are imperfect maintenance, and the break duration is stochastic due to environmental and other factors. Therefore, a selective maintenance optimization model is proposed with imperfect maintenance for stochastic break duration. The model is aimed to maximize the reliability of system successfully completing the next mission. The reinforcement learning(RL) method is applied to optimally select maintenance actions for selected components. The proposed model and the advantages of the RL are verified by three case studies verify.
16
Content available Selected Properties of Reinforcing Composite Bars for Concrete Elements Prepared from Waste Polyethylene Terephthalate (PET) Bottles
88%
Katzer J. , Grzybowski P. , Kobaka J.
Rocznik Ochrona Środowiska
|
2023
|
tom Tom 25
188--197
EN
A concept of producing reinforcing bars for concrete elements from waste polyethylene terephthalate (PET) bottles is presented in the paper. The proposed technology of production harnesses strips of PET cut from bottles and thermal treatment. Finally, a sand-resin coating is applied to the composite bars. Produced bars can be differentiated by utilising different numbers of strips influencing the diameter of a bar. The key mechanical properties of the bars containing 3 to 8 strips were tested during the research program. Maximum loadings and displacements were established. Problems regarding the future application of the bars in question were discussed. Areas of need for further research were pointed out.
17
Content available The attainment of equal durability of longitudinal reinforcements in ferro-concrete rod constructions at the stage of project construction
75%
Bazhenov Y. M. , Yerofeev V. T. , Novichkov P. I.
Problemy Eksploatacji
|
2013
|
tom nr 2
97--103
EN
In the given work, methods of mass transfer theory are used to solve problems of the reaction grout propagations in ferroconcrete rectangular rod cross-section elements and to suggest, on this basis, an original constructive solution for reinforcement cross-sections accounting for the equal reinforcement durability.
PL
W artykule przedstawiono wykorzystanie metod teorii przenikania masy do rozwiązywania problemów odkształcenia podłużnego w żelbetowych prętach o przekroju prostokątnym. Opracowano oryginalne rozwiązania do obliczeń zbrojeń betou pozwalające na uzyskiwanie wymaganej trwałości.
18
Content available remote On the Complexity of Reinforcement in Graphs
75%
Rad N. J.
Discussiones Mathematicae Graph Theory
|
2016
|
tom 36
|
nr 4
877-887
EN
We show that the decision problem for p-reinforcement, p-total rein- forcement, total restrained reinforcement, and k-rainbow reinforcement are NP-hard for bipartite graphs.
19
Content available remote Plane SH-wave response from elastic slab interposed between two different self-reinforced elastic solids
75%
Chaudhary S. , Kaushik V. P. , Tomar S. K.
International Journal of Applied Mechanics and Engineering
|
2006
|
tom Vol. 11, no 4
787-801
EN
Closed form expressions of reflection and transmission coefficients are obtained when a plane SH-wave becomes incident at a uniform elastic layer interposed between two different self-reinforced elastic solid half-spaces. It is found that the reflection and transmission coefficients are strongly influenced by the reinforcement parameters of the half-spaces. Numerical computations are performed for a specific model to study the effect of reinforcement parameters and angle of incidence of the incident wave on these coefficients. Numerical study reveals that both reflection and transmission coefficients are significantly influenced by the reinforcement parameters in the entire range of angle of incidence, except at normal and grazing incidence where the effect of reinforcement parameters is found minimum. Known results of some earlier workers are reduced from the present formulations.
20
Content available Application of adhesive joints in reinforcement and reconstruction of weakened wooden elements loaded axially
75%
Rapp P.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2016
|
tom 59
|
nr 196
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