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Wyświetlanie 1-15 z 477
Tytuł:
Fabrication And Mechanical Properties Of A Nanostructured Complex Aluminum Alloy By Three-Layer Stack Accumulative Roll-Bonding
Wytwarzanie i właściwości mechaniczne nanostrukturalnego złożonego stopu aluminium wytworzonego przez walcowanie pakietowe trzech warstw
Autorzy:
Lee, S. H.
Lee, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/351499.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
accumulative roll-bonding (ARB)
aluminum alloy
microstructre
mechanical properties
akumulacyjne walcowanie pakietowe
stop aluminium
mikrostruktura
właściwości mechaniczne
Opis:
A multi-layered complex aluminum alloy was successfully fabricated by three-layer stack accumulative roll bonding(ARB) process. The ARB using AA1050 and AA5052 alloy sheets was performed up to 7 cycles at ambient temperature without lubrication. The specimen processed by the ARB showed a multi-layer aluminum alloy sheet in which two aluminum alloys are alternately stacked. The grain size of the specimen decreased with the number of ARB cycles, became about 350nm in diameter after 7cycles. The tensile strength increased with the number of ARB cycles, after 6c it reached 281MPa which is about twice higher than that of the starting material. The microstructures and mechanical properties of a three-layer AA1050/AA5052 alloy fabricated by the ARB were compared to those of the conventional ARB-processed material.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1195-1198
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anti-solvent sonocrystallisation of lactose
Autorzy:
Patel, S.R.
Murthy, Z.V.P.
Powiązania:
https://bibliotekanauki.pl/articles/185611.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
n-propanol
odzyskiwanie laktozy
antyrozpuszczalnik
lactose recovery
anti-solvent
sonocrystallisation
Opis:
The present work deals with ultrasound assisted crystallisation of lactose from lactose solution. The crystallisation of lactose was completed rapidly by applying the ultrasound waves in the presence of an anti-solvent (n-propanol), at the room temperature (30š3°C). The yield of lactose was found to be more than 85% (w/w) in 4 minutes of sonication. The spread of the crystal size distribution was found to decrease with increase in sonication time.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 379-389
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress-tolerant antagonistic plant growth-promoting rhizobacteria from Zea mays
Autorzy:
Kaur, A.
Devi, S.R.
Vyas, P.
Powiązania:
https://bibliotekanauki.pl/articles/66648.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant disease
biological control
plant health
antagonism
plant growth
Bacillus
maize
Zea mays
stress tolerance
phosphate solubilization
Opis:
Biological control of plant diseases is strongly emerging as an effective alternative to the use of chemical pesticides and fungicides. Stress tolerance is an important attribute in the selection of bacteria for the development of microbial inoculants. Fourteen salt-tolerant bacteria showing different morphological features isolated from the rhizosphere of maize were evaluated for different plant growth-promoting activities. All isolates showed auxin production ranging from 5 to 24 μg ⋅ ml–1 after 48 h incubation in tryptophan supplemented media. Phosphate solubilization ranged from 15 to 419 μg ⋅ ml–1. 1-aminocycloproprane- 1-carboxylate (ACC) deaminase activity was shown by 6 isolates, ammonia production by 9 isolates, siderophore production by 8 isolates while HCN production by 4 isolates. Four bacterial isolates with all plant growth-promoting properties also showed strong antagonistic activities against Fusarium oxysporum, F. verticillioides, Curvularia lunata and Alternaria alternata and abiotic stress tolerance against salinity, temperature, pH and calcium salts. Two selected bacterial isolates significantly enhanced the growth of pea and maize test plants under greenhouse conditions. The bacterial isolate M1B2, which showed the highest growth promotion of test plants, was identified as Bacillus sp. based on phenotypic and 16S rDNA gene sequencing. The results indicated that Bacillus sp. M1B2 is a potential candidate for the development of microbial inoculants in stressful environments.
Źródło:
Journal of Plant Protection Research; 2018, 58, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Trichoderma Hamatum for Biocontrol of Lentil Vascular Wilt Disease: Efficacy, Mechanisms of Interaction And Future Prospects
Autorzy:
El-Hassan, S.A.
Gowen, S.R.
Pembroke, B.
Powiązania:
https://bibliotekanauki.pl/articles/65520.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Trichoderma hamatum (Bonord.) Bainier was evaluated for its antagonistic potential against Fusarium oxysporum Schlecht. emend. Snyder and Hansen sp. lentis, the causal agent of vascular wilt disease of lentil (Lens culinaris Medikus). Hyphal interactions on Petri plates resulted in an increase in the number of conidial spores and an increase in the vegetative growth of T. hamatum, and a decrease in the hyphal formation and sporulation of F. oxysporum f. sp. lentis. Electron and light microscopical observations suggested that hyphae of T. hamatum established aggressive contact and attachment with the hyphae of the pathogen. Growing in parallel, coiled densely and tightly, T. hamatum may penetrate those of the pathogen hyphae causing collapse due to the loss of turgor pressure. The cellulolytic enzymes produced by T. hamatum presented sufficient characteristics for its antifungal activity in the hyphae hydrolysis and competition process. In growth room and glasshouse experiments, the addition of the conidial suspension of T. hamatum or its culture filtrate to soil, significantly (p ≤ 0.05) reduced development and spore germination of F. oxysporum. In the rhizosphere, T. hamatum occupied the same ecological niches (rhizosphere, roots, and stems) parasitizing F. oxysporum f. sp. lentis. Treatments using T. hamatum delayed the time of infection by F. oxysporum, promoted the growth, and increased the dry weight of a susceptible variety of lentil (cv. Precoz). The percent of mortality was reduced to 33 and 40% when using T. hamatum and its filtrate, respectively, compared to 93% in the control treatment during the 65 days of growing in loam/sand (2:1 vol/vol) under glasshouse conditions. Plant colonization results indicate that T. hamatum and its filtrate significantly (p ≤ 0.05) reduced development of the pathogen in the vascular tissue of lentil to < 30 and < 40% stem colonization, respectively, compared to 100% in the plant pathogen control. Our results suggest that potential biocontrol mechanisms of T. hamatum towards F. oxysporum f. sp. lentis were antibiosis by production of antifungal enzymes, complex mechanisms of mycoparasitism, competition for key nutrients and/or ecological niches, growth promotion, and a combination of these effects. This study results hold important suggestions for further development of effective strategies of the biological control of Fusarium vascular wilt of lentil.
Źródło:
Journal of Plant Protection Research; 2013, 53, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of quercetin-functionalized silver nanoparticles by rapid one-pot approach
Autorzy:
Pandian, S.R.K.
Kunjiappan, S.
Ravishankar, V.
Sundarapandian, V.
Powiązania:
https://bibliotekanauki.pl/articles/2096369.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quercetin
bioflavonoid
one-pot synthesis
AgNPs
antioxidant
Opis:
Nanotechnology plays a pivotal role in all areas of science, and the synthesis and surface modification of nanoparticles are crucial in this field. Metal nanoparticles synthesized using plant extracts or phytocompounds are highly significant in the development of various therapeutics and diagnostics. In the present study, we report the one-pot and rapid synthesis of silver nanoparticles (AgNPs) by quercetin, a flavonoid found in various edible plants. The nanoparticles were then characterized using UV-VIS spectrophotometry, Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The role of quercetin in the synthesis of silver nanoparticles was demonstrated. The nanomaterial was 20–30 nm in size and spherical in shape. The silver nanoparticles were also confirmed to show antioxidant activity at 80 μg/ml concentration in vitro by DPPH, FRAP, and power reduction methods.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 1; 75-84
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic Phase Diagram and Phonon stability, Electronic and Optical Properties of FeVSb: A DFT study
Autorzy:
Bagheri, A.
Boochani, A.
Masharian, S. R.
Jafarpour, F. H.
Powiązania:
https://bibliotekanauki.pl/articles/2203753.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DFT
thermodynamic phase diagram
phonon
electronic properties
optical properties
Opis:
Mechanical, electronic, thermodynamic phase diagram and optical properties of the FeVSb half-Heusler have been studied based on the density functional theory (DFT) framework. Studies have shown that this structure in the MgAgAs-type phase has static and dynamic mechanical stability with high thermodynamic phase consistency. Electronic calculations showed that this compound is a p-type semiconductor with an indirect energy gap of 0.39 eV. This compound’s optical response occurs in the infrared, visible regions, and at higher energies its dielectric sign is negative. The Plasmon oscillations have occurred in 20 eV, and its refraction index shifts to zero in 18 eV.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 331--338
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis of a shallow depth metro tunnel: a numerical approach
Analiza stabilności płytkiego tunelu metra z wykorzystaniem metod numerycznych
Autorzy:
Monjezi, M.
Rahmani, B. N.
Torabi, S. R.
Singh, T. N.
Powiązania:
https://bibliotekanauki.pl/articles/219211.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modelowanie numeryczne
gwoździowanie gruntu
drążenie tuneli przy pomocy tarcz
szkody górnicze
osiadanie gruntu
numerical modelling
soil nailing
shield tunnelling
subsidence
Opis:
In this paper, an attempt has been made to use numerical modelling for simulating a long halt in construction process at a shallow depth metro tunnel and investigate the effects of soil nailing to increase the tunnel face strength. Finite difference software FLAC with high applicability in a continuum environment was adopted for this study. The tunnel is being excavated for Tehran metro project. Shield tunnelling with roadheader and back hoe cutting tools is applied in the excavation process. Mohr-Coulomb elasto-plastic constitutive law is considered to model the ground. After two months halting in excavation process, tunnel instability and ground subsidence were recorded in thirteen different monitoring points. Numerical simulation results showed a close approximation (11-16%) between measured and FLAC computed displacements of the tunnel crown in case of unsupported face, which is in close proximity and a proof indicates the reliability of simulation. Also, simulation results exhibit a significant reduction in the ground subsidence and tunnel instability in case of supported face by means of the soil nailing.
W artykule podjęto próbę wykorzystanie metod modelowania numerycznego dla potrzeb symulacji dłuższego przestoju prac związanych z budową płytkiego tunelu metra w celu zbadania skutków wzmacniania gruntu dla zwiększenia wytrzymałości tunelu w części czołowej. W badaniach zastosowano oprogramowanie wykorzystujące metodę różnic skończonych FLAC, do zastosowań w środowisku ciągłym. Wykop tunelu wykonywany jest w ramach budowy metra w Teheranie. Kopanie tunelu odbywa się przy pomocy urządzeń tarczowych do drążenia tuneli oraz urządzeń podsiębiernych do urabiania. Do modelowania gruntu zastosowano model sprężysto-plastyczny Mohra-Coulomba z wykorzystaniem równania konstytutywnego. Po dwumiesięcznym przestoju w pracach budowlanych, zarejestrowano wielkości niestabilności tunelu oraz osiadania gruntu w trzynastu równych punktach pomiarowych. Wyniki symulacji numerycznych wykazały wysoką zbieżność (11-16%) pomiędzy wartościami zmierzonymi a przemieszczeniami obliczonymi przy wykorzystaniu oprogramowania FLAC dla stropu tunelu w niepodpartej części czołowej, co potwierdza wiarygodność wyników symulacji. Ponadto, wyniki symulacji wykazują znaczne zmniejszenie osiadania gruntu i niestabilności tunelu w części czołowej tunelu wzmocnionej przez podbijanie gruntu.
Źródło:
Archives of Mining Sciences; 2012, 57, 3; 535-545
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unified design method of time delayed PI controller for first order plus dead-time process models with different dead-time to time constant ratio
Autorzy:
Pathiran, Arun R.
Muniraj, R.
Iruthayarajan, M. Willjuice
Prabhu, S. R. Boselin
Jarin, T.
Powiązania:
https://bibliotekanauki.pl/articles/1409359.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PI controller
time delayed PI controller
dead-time compensation
Opis:
The time delay element present in the PI controller brings dead-time compensation capability and shows improved performance for dead-time processes. However, design of robust time delayed PI controller needs much responsiveness for uncertainty in dead-time processes. Hence in this paper, robustness of time delayed PI controller has been analyzed for First Order plus Dead-Time (FOPDT) process model. The process having dead-time greater than three times of time constant is very sensitive to dead-time variation. A first order filter is introduced to ensure robustness. Furthermore, integral time constant of time delayed PI controller is modified to attain better regulatory performance for the lag-dominant processes. The FOPDT process models are classified into dead-time/lag dominated on the basis of dead-time to time constant ratio. A unified tuning method is developed for processes with a number of dead-time to time constant ratio. Several simulation examples and experimental evaluation are exhibited to show the efficiency of the proposed unified tuning technique. The applicability to the process models other than FOPDT such as high-order, integrating, right half plane zero systems are also demonstrated via simulation examples.
Źródło:
Archives of Control Sciences; 2021, 31, 2; 447-476
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of Large-area Arrays of Aperiodic Functional Micro/nano Structures Using Phase Shift Interferometry
Autorzy:
Pearly Princess, J.
Alfred Kirubaraj, A.
Christina Sophia, S.
Senith, S.
Jino Ramson, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/2055275.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser interference lithography
LIL
pattern structures
periodic patterns
aperiodic patterns
phase shift interferometry
PSI
Opis:
Phase shift interferometry (PSI) derived from interference technique as greater surface characterization technique based on the interference information recorded during a controlled phase shift. This research shows the development of micro/nano structures using phase shift interferometry. (PSI) is the process of developing the complex pattern structure using variable phase angle between two or more beams aligned to obtain functional aperiodic arrays. We have designed and modelled the PSI and simulated through MATLAB in 2D and 3D pattern structures. The PSI was performed in two process analysis. First, without PSI referring normal interference technique. Second, with PSI referring position of laser beams in quadrant-based alignment. The obtained results show the minimum feature structure was measured as 12 nm. This feature size developed under phase shift interferometry (PSI) produces minimum feature size compared to the existing interferometry technique. This study gives the promising increased fabrication area could develop large area arrays structures.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 1; 91--96
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bidirectionally stretched flow of Jeffrey liquid with nanoparticles, Rosseland radiation and variable thermal conductivity
Autorzy:
Archana, M.
Gireesha, B. J.
Rashidi, M. M.
Prasannakumara, B. C.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/240409.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat mass transfer
jeffrey nanofluid
variable thermal conductivity
rosseland approximation
suction
ciepło
masa
zmienna przewodność cieplna
aproksymacja
ssanie
Opis:
Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.
Źródło:
Archives of Thermodynamics; 2018, 39, 4; 33--57
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Magnetic Properties of NdFeB Sintered Magnets Diffusion-Treated with Cu/Al Mixed Dyco Alloy-Powder
Autorzy:
Lee, M.-W.
Bae, K.-H.
Lee, S.-R.
Kim, H.-J.
Jang, T.-S.
Powiązania:
https://bibliotekanauki.pl/articles/353351.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nd-Fe-B sintered magnets
grain boundary diffusion process
low melting point element
DyCo alloy-powder diffusion
Opis:
We investigated the microstructural and magnetic property changes of DyCo, Cu + DyCo, and Al + DyCo diffusion-treated NdFeB sintered magnets. The coercivity of all diffusion treated magnet was increased at 880ºC of 1st post annealing(PA), by 6.1 kOe in Cu and 7.0 kOe in Al mixed DyCo coated magnets, whereas this increment was found to be relatively low (3.9 kOe) in the magnet coated with DyCo only. The diffusivity and diffusion depth of Dy were increased in those magnets which were treated with Cu or Al mixed DyCo, mainly due to comparatively easy diffusion path provided by Cu and Al because of their solubility with Ndrich grain boundary phase. The formation of Cu/Al-rich grain boundary phase might have enhanced the diffusivity of Dy-atoms. Moreover, relatively a large number of Dy atoms reached into the magnet and mostly segregated at the interface of Nd2 Fe14 B and grain boundary phases covering Nd2 Fe14 B grains so that the core-shell type structures were developed. The formation of highly anisotropic (Nd, Dy)2Fe14B phase layer, which acted as the shell in the core-shell type structure so as to prevent the reverse domain movement, was the cause of enhancing the coercivity of diffusion treated NdFeB magnets. Segregation of cobalt in Nd-rich TJP followed by the formation of Co-rich phase was beneficial for the coercivity enhancement, resulting in the stabilization of the metastable c-Nd2O3 phase.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1263-1266
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zdenko Radelić, Križari: gerila u Hrvatskoj 1945.-1950. Drugo izmijenjeno i dopunjeno izdanje, Alafa d. d., Hrvatski institut za povijest, Zagrzeb 2011, ss. 675
Autorzy:
a, Mateusz S e r o k
Powiązania:
https://bibliotekanauki.pl/articles/705113.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Pamiętnik Słowiański; 2013, 63, 1-2
0078-866X
Pojawia się w:
Pamiętnik Słowiański
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation into the effect of rockmass properties on mean fragmentation
Autorzy:
Chandrahas, Sri
Choudhary, Bhanwar Singh
Prasad, N. S. R. Krishna
Musunuri, Venkataramayya
Rao, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/2073876.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
górotwór
test wytrzymałości
kopalnia węgla
Opis:
Desired rock fragmentation is the need of the hour, which influences the entire mining cycle. Thus, most engineering segments pay attention to rock fragmentation and neglect by-products like ground vibration and fly rock. Structural and mechanical properties of rock mass like joint spacing, joint angle, and compressive strength of rock pose a puzzling impact on both fragmentation and ground vibration. About 80% of explosive energy that gets wasted in producing ill effects can be positively optimised, with a new set of blast design parameters upon identifying the behaviour of rock mass properties. In this connection, this research aims to investigate the influence of joint spacing, joint angle, and compressive strength of rock on fragmentation and induced ground vibration. To accomplish this task, research was carried out at an opencast coal mine. It was discovered from this research that compressive strength, joint spacing, and joint angle have a significant effect on the mean fragmentation size (MFS) and peak particle velocity (PPV). With the increase in compressive strength, MFS explicit both increase and decrease trends whilst PPV increased with a specific increase in compressive strength of the rock. An increase in joint spacing triggers both increase and decrease trends in both MFS and PPV. While there is an increase in joint angle, MFS and PPV decrease.
Źródło:
Archives of Mining Sciences; 2021, 66, 4; 561--578
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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