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Wyświetlanie 1-15 z 19
Tytuł:
Determining the value of surface free energy on the basis of the contact angle
Autorzy:
Kłonica, M.
Kuczmaszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/102227.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
energy state
surface layer
contact angle
ozonization
Opis:
This paper presents the results of tests concerning the value of surface free energy on the basis of measurements of contact angle with measure liquids: distilled water and diiodomethane. The surface of steel-316L samples was modified in an ozone atmosphere, and the concentration of ozone and the conditioning time of the samples in the reaction chamber were changed. The results of tests concerning the measurements of the value of surface free energy were subject to analysis. Also analysed were the components of SFE: the polar and dispersive components. The obtained test results were analysed in statistical terms. The paper ends with conclusions.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 1; 66-74
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on silicon solar cell capacitance and its dependence on both temperature and incidence angle
Autorzy:
Sané, M
Barro, F I
Powiązania:
https://bibliotekanauki.pl/articles/102664.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vertical junction
capacitance
temperature
incidence angle
Opis:
The aim of this work is to investigate a theoretical study of a vertical junction silicon solar cell capacitance under monochromatic illumination. By solving the continuity equation and using a one dimensional model in frequency modulation, we derive the analytical expressions of both excess minority carrier density and photovoltage. Based on these expressions, the solar cell capacitance was calculated; we then exhibited the effects of both temperature and incidence angle on the solar cell capacitance.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 24; 9-12
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the narrowing angle in beveliod gear on the temperature profile on the active flank of tooth
Autorzy:
Sobolak, M.
Strojny, P.
Powiązania:
https://bibliotekanauki.pl/articles/103208.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Beveloid gear
temperature profile
narrowing angle
Opis:
This paper contains a description of the test bench to research the temperature distribution in gears made of a plastic polymer. The paper presents the research results of the change and the temperature distribution on the side surface of the Beveloid tooth gear. The research were performed for a series of Beveloid gears with different values of narrowing angle.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 20; 67-69
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of incidence angle varying from 0 rad to Π/2 rad and intensity of radio waves on the performance of a silicon solar cell
Autorzy:
Zerbo, I.
Zoungrana, M.
Saria, M.
Ouedraogo, A.
Bathiebo, D. J.
Powiązania:
https://bibliotekanauki.pl/articles/102585.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
conversion efficiency
incidence angle
radio waves
shunt resistance
solar
cell
Opis:
In this work, a one dimensional approach is presented for modelling the effect of the incidence angle, varying from 0 rad to π/2 rad, and the intensity of radio waves on the performance of a polycrystalline silicon solar cell under constant multispectral illumination. By solving the continuity equation in steady state, we derived the expression of the density of excess minority carriers, the photocurrent density, the photovoltage, the electric power and their dependence on the incidence angle and the intensity of the electromagnetic field is analyzed. Using the electric power curves versus junction dynamic velocity we determined the electric power lost at the junction, the maximum electric power and we calculated the conversion efficiency for various incidence angle and intensity of the electromagnetic field. The leakage photocurrent density, deduced from the photocurrent density curves versus junction dynamic velocity, and the electric power lost at the junction allowed us to calculate the shunt resistance of the solar cell according to the incidence angle and the intensity of the electromagnetic field. The numerical data show the negative effect of radios waves on the performance of a silicon solar cell.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 68-75
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating durability time interval of three-dimensional steel frame with angle connections under elevated temprature
Autorzy:
Rad, H.
Yahyayi, M.
Powiązania:
https://bibliotekanauki.pl/articles/957965.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
steel structures
fire loading
temperature
connection
Opis:
During recent years, much attention has been paid to the analysis of fire effect on steel structures because of fire importance and its effect on the stability of steel structures. Considering steel sensitivity to heat and high costs of steel frames retrofitting with the help of thermal covers, accurate behavior analysis of metal frames in elevated tem-peratures is required in order to reduce undesirable effects of temperature increase. To do so and taking into account the high costs of lab tests and their limitations in investigation of numerous parameters during any test, finite element method is used as a powerful and valuable tool in modeling of steel frames under thermal conditions. In this study, the fire effect on steel beams is studied considering the softening of connec-tion and decrease of materials strength. Then, structure durability in fire will be ana-lyzed in the ANSYS software. The analyzed frame is a single span three dimensional one and different conditions including connection type, longitudinal expansion effect, thermal loading and the kind of fire will be analyzed and compared. The obtained computer results will be compared with other researches results.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 29; 28-40
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind Tunnel Research on the Unmanned Aerial Vehicle Rotor Blade Setting Angle
Autorzy:
Siadkowska, Ksenia
Powiązania:
https://bibliotekanauki.pl/articles/101916.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wind tunnel
thermoanemometer
rotor blade
aerodynamic coefficient
UAV
tunel aerodynamiczny
łopata wirnika
współczynnik aerodynamiczny
Opis:
The recommended optimal twist angles were determined for particular sections of the prototype rotor blade dedicated to an unmanned helicopter. The main rotor blade was tested in the GUNT HM 170 tunnel for four different air flow velocities and variable angles of attack. The blade model was divided into sections, each of them was made in the 3D printing technology. For all the sections, the maximum lift and drag forces were determined and then converted to dimensionless values. The aerodynamic characteristics were calculated for each section and different air flow velocities in the wind tunnel. Due to the division of the blade into sections, it was possible to define the most favorable angles of attack along the rotor radius. Aerodynamic excellence was identified for each blade section and air flow velocities.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 4; 104-114
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Effects of the Incident Flow Angle on Vibration Behavior in Heat Exchanger Tube Bundle
Autorzy:
Usman, Muhammad
Khushnood, Shahab
Nizam, Luqman Ahmad
Tanveer, Waqas
Shafi, Ahmad
Ayub, Muhammad
Khan, Hassan Farid
Rustam, Behzad
Powiązania:
https://bibliotekanauki.pl/articles/102083.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
incident flow angle
fluid elastic instability
flow-induced vibration
parallel triangular array
cross flow velocity
flexible tube
kąt przepływu
niestabilność sprężysta płynu
drgania indukowane przepływem
równoległy układ trójkątny
prędkość przepływu poprzecznego
elastyczna rura
Opis:
An experimental study on the incident flow angle effects on the vibration behavior was carried out on aluminum tube in parallel triangular tube bundle with P/D ratio of 1.375. Fluid elastic instability is the most fatal mechanism from all the vibration mechanisms and therefore must be dealt with a lot of attention. Experiments were performed on low speed water tunnel with the velocity of water ranges from 0.3 m/s to 0.7 m/s. The experiments were designed in a unique way to study the effects of incident flow angle on the vibration behavior. The monitored tube was mounted flexibly in an array of rigid tubes. The experiments were conducted on a flexible tube for different velocities ranging from 0.3 m/s to 0.7 m/s with different array rotated angles (0 to 90 degrees). It was observed that the vibration level was significantly high at 75 degree configuration as compared to other rotated angle configurations. It was also observed that the damping response is dispersed with all positive values, indicating that there is no instability in the tube.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 2; 186-194
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Machining Settings and Tool Geometry on Surface Quality After Machining of Al/CFRP Sandwich Structures
Autorzy:
Doluk, Elżbieta
Rudawska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2201775.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sandwich structure
milling
material height difference
cutting parameters
helix angle
Opis:
The paper describes the effect of cutting parameters and tool geometry on the surface quality after machining of an Al/CFRP (aluminium alloy/ Carbon Fibre Reinforced Plastics) sandwich structure. A two-layer sandwich structure made of an EN AW 2024 aluminium alloy and Carbon Fibre Reinforced Plastics (CFRP) was examined. The experiment used the process of peripheral milling. The experiment investigated the effects of cutting speed (vc), feed per blade (fz) and helix angle (λs) on surface quality as defined by differences in the height of materials. It was also analysed how the machining conditions described above affected the values of cutting force components. In the experimental stage of the study, uncoated, double-bit carbide mill cutters with working diameter Dc = 12mm and a variable helix angle (λs = 20˚, λs = 35˚, λs = 45˚) were used. The results have shown that cutting parameters and tool geometry do affect the surface quality and cutting forces after milling of the sandwich structure. The lowest material height difference was achieved when machining with the helix angle λs = 45˚, cutting speed vc = 300m/min and feed per blade fz = 0.08mm/blade. The highest material height difference occurred after machining under the following conditions: vc = 300m/min, fz = 0.08mm/min, λs = 20˚. The minimum cutting force value was obtained for cutting parameters: vc = 80m/min, fz = 0.08mm/blade during milling with the helix angle λs = 45˚. The maximum cutting force was recorded during machining with the helix angle λs = 20˚, cutting speed vc = 400m/min and feed per blade fz = 0.08 mm/blade.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 22--33
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Concrete Surface with Higher Fatty Acids
Autorzy:
Barnat-Hunek, Danuta
Andrzejuk, Wojciech
Szafraniec, Małgorzata
Kachel, Magdalena
Hunek, Robert
Powiązania:
https://bibliotekanauki.pl/articles/2201909.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
contact angle
higher fatty acid
hydrophobic agent
hydrophobization
water tightness
vapor permeability
Opis:
The research presented in the paper concerns the production of innovative hydrophobizing agents and demonstration their effectiveness on a concrete surface. The starting materials are based on natural oils, water‒soluble silanes and siloxanes, and/or tap water. Aqueous preparations are characterized by properties which reduce the impact of volatile organic compounds (VOCs) on the environment, as they consist only of biodegradable components. Studies have shown that the higher fatty acids from vegetable oils and derived from the glycerin phase can be used as a component of concrete hydrophobizing agents, meeting the standard requirements for such agents. Analysis of the use of vegetable oil as a base compound for the production of industrial agents provides at least 95% confidence in its biodegradability. The reference concrete after the frost resistance test showed a weight loss of 1.8%. In the case of hydrophobization, the weight loss was 33.3 to 72% less than the reference samples. In the case of concrete hydrophobized with the glycerin agents, the salt crystallization occurred inside the structure of the material without causing any damage, with the reference concrete showing a weight loss of 0.8%.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 307--321
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the cutting tool geometry on the tool wear resistance when machining Inconel 625
Autorzy:
Zlámal, T.
Hajnyš, J.
Petrů, J.
Mrkvica, I.
Powiązania:
https://bibliotekanauki.pl/articles/103138.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wear resistance
Inconel 625
cutting tool geometry
entering angle
Opis:
The paper deals with the design of a suitable cutting geometry of a tool for the machining of the Inconel 625 nickel alloy. This alloy is among the hard-to-machine refractory alloys that cause very rapid wear on cutting tools. Therefore, SNMG and RCMT indexable cutting insert were used to machine the alloy. The selected insert geometry should prevent notch wear and extend tool life. The alloy was machined under predetermined cutting conditions. The angle of the main edge and thus the size and nature of the wear changed with the depth of the material layer being cut. The criterion for determining a more suitable cutting geometry was the tool’s durability and the roughness of the machined surface.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 286-293
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Aerodynamic Efficiency of Aerofoil Using Improved Blowing and Suction System
Autorzy:
Balaji, K.
Wessley, G. Jims John
Powiązania:
https://bibliotekanauki.pl/articles/2024000.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Co flow jet
Improved blowing and suction system
aerodynamic efficiency
stalling angle
control surfaces
secondary flow
Opis:
Improved Blowing and Suction System (IBSS) is a novel concept that can be effectively implemented in future aircraft to improve the aerodynamic performance of aircraft wings. The proposed IBSS consists of a regular wing without its secondary control surfaces and with a Pump. The injection and suction system is used to create additional flow without disturbing the main flow over the aerofoil which effectively delays the boundary layer separation. The injection and suction areas are kept constant and they are located just below the maximum thickness point and suction is created close to the trailing edge. This paper presents a detailed numerical analysis of the proposed IBSS and the study shows that the stalling angle of attack is increased by 60% while the coefficient of lift is increased 37.5% compared to the baseline aerofoil. Also, the commercially used coflow jet (CFJ) method stalls at a 12° angle of attack whereas with the proposed IBSS method the stall occurs at a 16° angle of attack. The stalling angle is thus delayed by 33%, thus increasing the aerodynamic performance of the wing as compared to the existing methods. Also, any malfunction in IBSS does not significantly affect the performance of the aircraft. The implementation of IBSS will lead to a reduction in the weight of the aircraft and the elimination of secondary control surfaces.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 2; 116-126
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Fiber Arrangement in the Bio-Laminate and Geometric Parameters on the Stability of Thin-Walled Angle Column Under Axial Compression
Autorzy:
Gawryluk, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2201861.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
bio-laminates
flax
buckling analysis
L-profile
numerical case
Opis:
The aim of this study is to check how the change fiber configuration and geometric parameters affect the stability of a thin-walled angle column under compression. Buckling analysis of thin-walled structures made of bio-laminates was presented. Short angles with different configurations of reinforcing fibers and geometric parameters were studied. The laminate under analysis had a matrix made of epoxy resin reinforced with unidirectional flax fibers. The axially compressed structures were simply supported on both ends. Detailed numerical analyses were conducted by the finite element method using Abaqus software. The lowest two bifurcation loads and their corresponding eigenmodes were determined. Several configurations of unidirectional fiber arrangement with different width and length were tested. Results showed that the bio-laminate fiber configuration had a significant effect on the behavior of the compressed structure. Moreover, the change of geometrical parameters significantly influences the stability of the structure. In general, it was found that the bifurcation load decreased with the increase of the length of the L-profile column. However, increasing the flange width of the column resulted in a reduction of the bifurcation load (applies to a column with a length of 300 mm and longer). In paper the first stage of research is presented, which will be experimentally verified in subsequent studies.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 150--159
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Impact of Gust Angle and Velocity on the Position of Stagnation Point
Autorzy:
Frant, Michał
Kozakiewicz, Adam
Kachel, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/102313.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
inlet vortex
numerical fluid mechanics
turbine jet engine
wir wlotowy
numeryczna mechanika płynów
turbinowy silnik odrzutowy
Opis:
This paper presents the selected issues regarding the design of a complex object of a turbine jet engine inlet duct model for the purposes of numerical analysis related to the phenomenon of inlet vortex formation. The authors described the process of discretisation in the matter in question and presented certain guidelines for preparing and conducting discretisation of the computational area. The authors presented an exemplary test findings analysis to verify the accuracy of the object’s shape, computation grid as well as the selection of the boundary conditions and solution algorithm. The main part of the paper regards the analysis of changes in the location of the vortex (point of stagnation) based on an examination of the impact related to the changes in the velocity and inlet and gust angles. The authors sought to determine the areas and regularity of points of stagnation.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 4; 49-57
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Active Diluent Addition on the Energy and Adhesive Properties of Epoxy Adhesive
Autorzy:
Krawczuk, Anna
Domińczuk, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/103375.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
contact angle
surface free energy
epoxy adhesives
adhesive joint
kąt zwilżania
wolna energia powierzchniowa
kleje epoksydowe
połączenie klejowe
Opis:
The paper reports values of surface free energy and its components of an epoxy adhesive modified by the addition of an active diluent. Wetting envelopes are determined and they serve as a basis for a wettability analysis and determining the possibility of maximizing the work of adhesion between the liquid and the solid. Static strength tests of adhesive joints made with the analysed adhesive compositions were also conducted. The results are used to determine the effect of active diluent addition on the energy and adhesive properties of the epoxy adhesive
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 19-25
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration of Selected Bulk Biomaterials Parameters for DEM Simulation of Comminution Process. Case Study: Corn and Rice Grains
Autorzy:
Kruszelnicka, Weronika
Diviš, Jan
Hlosta, Jakub
Gierz, Łukasz
Žurovec, David
Powiązania:
https://bibliotekanauki.pl/articles/2206279.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
DEM
comminution
angle of repose
restitution coefficient
breakage probability
biomaterials
Opis:
Computer simulation of bulk materials behavior, including comminution and fragmentation, using DEM has been growing fast, recently. One of the important tasks to get the reliable simulation results is to provide proper materials and contact parameters, which need to be determined in a series of laboratory experiments. For comminution simulation the additional parameters describing the breakage probability and breakage functions are necessary. While some simulation parameters are available in the literature for brittle materials, valid data are lacking for biomaterials such as cereal, rice or corn grains, especially for comminution parameters. The aim of this study was to present the calibration approach and determination of materials, contact, interaction and breakage parameters for grainy biomaterials. The calibration process was done for rice and corn grains. The calibration approach consists of grains size distribution and shape characterization, friction and restitution coefficient determination, and breakage probability description. Based on the results of the experiments, the models were created in the DEM software. The result was the set of calibrated parameters for rice and corn grains.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 5; 64--77
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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