Autor: Biswas, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of Microstructural Morphology on Microscale Deformation Behavior of Al-4.5Cu-2Mg Alloy
Autorzy:: Biswas, P.
Bhandari, R.
Mondal, M. K.
Mandal, D.
Powiązania:: https://bibliotekanauki.pl/articles/351178.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-4.5Cu-2Mg alloys
optical microstructure
representative volume element
RVE
finite element method
microscale deformation
Opis:: The microscale deformation behaviour of the Al-4.5Cu-2Mg alloy has been studied to understand the influence of various processing routes and conditions, i.e. the gravity casting with and without grain refiner, the rheocast process and the strain induced melt activation (SIMA) process. The micromechanics based simulations have been carried out on the optical microstructures of the alloy by 2D representative volume elements (RVEs) employing two different boundary conditions. Microstructural morphology, such as the grain size, the shape and the volume fraction of α-Al and binary eutectic phases have a significant effect on the stress and strain distribution and the plastic strain localization of the alloy. It is found that the stress and strain distribution became more uniform with increasing the globularity of the α-Al grain and the α-Al phase volume fraction. The simulated RVEs also reveals that the eutectic phase carries more load, but least ductility with respect to the α-Al phase. The SIMA processed alloy contains more uniform stress distribution with less stress localization which ensures better mechanical property than the gravity cast, grain refined and rheocast alloy.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 4; 1575-1586
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Exogenous application of gibberellic acid mitigates drought-induced damage in spring wheat
Egzogenna aplikacja kwasu giberelinowego łagodzi uszkodzenia pszenicy jarej wywołane suszą
Autorzy:: -, Moumita
Al Mahmud, J.
Biswas, P.K.
Nahar, K.
Fujita, M.
Hasanuzzaman, M.
Powiązania:: https://bibliotekanauki.pl/articles/949302.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Botaniczne
Opis:: Drought stress is a major problem in wheat production but it could be managed by using various exogenous protectants such as gibberellic acid (GA). Although GA is a plant growth hormone, it shows a potential to protect the plant in stress conditions. To investigate the possible role of GA in mitigating drought stress, we treated wheat (Triticum aestivum ‘BARI Gom-21’) seedlings with a GA spray under semihydroponic conditions. In the experiment, the combined effect of GA and drought stress (induced by 12% polyethylene glycol) was studied after 48 h and 72 h. In the absence of exogenous GA, drought-stressed wheat seedlings showed various physiological and biochemical changes in a time-dependent manner. Malondialdehyde (MDA), hydrogen peroxide (H2O2) and free proline (Pro) concentrations were increased, whereas catalase (CAT) and ascorbate peroxidase (APX) activities were reduced under drought stress. Gibberellic acid played a role in restoring the ascorbate (AsA) level, decreased the reduced/oxidized glutathione (GSH/GSSG) ratio and reduced monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) activities. Gibberellic acid significantly affected the glyoxalase system. Under drought stress, the methylglyoxal (MG) concentration was increased but GA application stimulated glyoxalase I (Gly I) and glyoxalase II (Gly II) activities to protect the wheat seedlings against stress. The study concluded that the severity of drought stress in wheat depends on the growth stage and it increases with an increase in the duration of stress, whereas exogenous GA helped the seedlings to survive by upregulating antioxidant defense mechanisms and the glyoxalase system.
Stres spowodowany suszą jest głównym problemem w produkcji pszenicy, ale można mu zapo- biegać przy pomocy różnych egzogennych środków ochronnych, takich jak kwas giberelinowy (GA). Chociaż GA jest fitohormonem, wykazuje potencjalne działanie ochronne w stosunku do roślin rosnących w warunkach stresowych. W celu zbadania ewentualnego oddziaływania GA w łagodzeniu stresu suszy, sadzonki pszenicy (Triticum aestivum‘BARI Gom-21’) traktowaliśmy GA w formie oprysku w warunkach pół-hydroponicznych. W przeprowadzonym doświadczeniu badano łączny wpływ GA i stresu suszy (indukowanego przez 12% glikol polietylenowy) po 48 godzinach i 72 godzinach. W siewkach pszenicy poddanych działaniu suszy, pod nieobecność egzogennego GA, stwierdzono różnorodne zmiany fizjologiczne i biochemiczne, uzależnione od czasu ekspozycji. Pod wpływem suszy stężenia dialdehydu malonowego (MDA), nadtlenku wodoru (H2O2) oraz wolnej proliny (Pro) zwiększały się, podczas gdy aktywność katalazy (CAT) i peroksydazy askorbinianowej (APX) uległa zmniejszeniu. Kwas giberelinowy odgrywał rolę w przywracaniu prawidłowego poziomu askorbinianu (AsA), zmniejszał stosunek glutationu zredukowanego/utlenionego (GSH/GSSG) oraz obniżał aktywności reduktazy monodehydro- askorbinianowej (MDHAR) i reduktazy dehydroaskorbinianowej (DHAR). Kwas giberelinowy istotnie wpłynął na układ glioksalazy. Pod wpływem stresu suszy stężenie metyloglioksalu (MG) wzrosło, ale aplikacja GA stymulowała aktywność glioksalazy I (Gly I) i glioksalazy II (Gly II) chroniąc siewki pszenicy przed stresem. W badaniach wykazano, że natężenie stresu suszy u pszenicy zależy od etapu wzrostu i nasila się wraz z wydłużeniem czasu trwania stresu, podczas gdy egzogenny GA zwiększa możliwość przetrwania siewek poprzez wzmocnienie mechanizmów obrony antyoksydacyjnej i regulację systemu glioksalazy.
Źródło:: Acta Agrobotanica; 2019, 72, 2
0065-0951
2300-357X
Pojawia się w:: Acta Agrobotanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An improved ID - based client authentication with key agreement scheme on ECC for mobile client - server environments
Autorzy:: Islam, S. K. H.
Biswas, G. P.
Powiązania:: https://bibliotekanauki.pl/articles/375740.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Elliptic curve cryptography
identity-based cryptosystem
mutual authentication
session key
users' anonymity
client-server environment
Opis:: In wireless mobile networks, a client can move between different locations while staying connected to the network and access the remote server over the mobile networks by using their mobile devices at anytime and anywhere. However, the wireless network is more prone to some security attacks, as it does not have the ingrained physical security like wired networks. Thus, the client authentication is required while accessing the remote server through wireless network. Based on elliptic curve cryptosystem (ECC) and identity-based cryptography (IBC), Debiao et al. proposed an ID-based client authentication with key agreement scheme to reduce the computation and communication loads on the mobile devices. The scheme is suitable for mobile client-server environments, is secure against different attacks and provides mutual authentication with session key agreement between a client and the remote server as they claimed. Unfortunately, this paper demonstrates that Debiao et al.' scheme is vulnerable some cryptographic attacks, and proposed an improved ID-based client authentication with key agreement scheme using ECC. The proposed scheme is secure based on Elliptic Curve Discrete Logarithm Problem (ECDLP) and Computational Diffie- Helmann Problem (CDHP). The detail analysis shows that our scheme overcomes the drawbacks of Debiao et al.'s scheme and achieves more functionality for the client authentication with lesser computational cost than other schemes.
Źródło:: Theoretical and Applied Informatics; 2012, 24, 4; 293-312
1896-5334
Pojawia się w:: Theoretical and Applied Informatics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: An efficient and provably - secure digital signature scheme based on elliptic curve bilinear pairings
Autorzy:: Islam, S. K. H.
Biswas, G. P.
Powiązania:: https://bibliotekanauki.pl/articles/375650.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Elliptic curve cryptography
bilinear pairing
Map-to-point function
digital signature
random oracle model
provably secure
Opis:: We proposed an efficient and secure digital signature scheme using elliptic curve cryptography (ECC) and bilinear pairings in this paper. The proposed scheme employs the general cryptographic hash function (i.e., SHA-1) instead of map-to-point function, because the map-to-point is a cost-intensive operation and it is usually implemented as a probabilistic algorithm. Further, our scheme is computationally efficient as one bilinear paring and three elliptic curve scalar point multiplication operations are executed for signature generation and verification, and thus the scheme requires much lesser computation cost than other related schemes. In addition, in the random oracle model, our scheme is proven to be existential unforgeable against the adaptive chosen message and identity attacks (EUF-CMA) based on a variation of the collusion attack algorithm with ktraitors (k-CAA3) problem.
Źródło:: Theoretical and Applied Informatics; 2012, 24, 2; 109-118
1896-5334
Pojawia się w:: Theoretical and Applied Informatics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Solitons and Other Solutions to Perturbed Rosenau-KdV-RLW Equation with Power Law Nonlinearity
Autorzy:: Sanchez, P.
Ebadi, G.
Mojaver, A.
Mirzazadeh, M.
Eslami, M.
Biswas, A.
Powiązania:: https://bibliotekanauki.pl/articles/1189710.pdf
Data publikacji:: 2015-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.45.Yv
02.30.Jr
Opis:: This paper obtains solitons and other solutions to the perturbed Rosenau-KdV-RLW equation that is used to model dispersive shallow water waves. This equation is taken with power law nonlinearity in this paper. There are several integration tools that are adopted to solve this equation. These are Kudryashov method, sine-cosine function method, G'/G-expansion scheme and finally the exp-function approach. Solitons and other solutions are obtained along with several constraint conditions that naturally emerge from the structure of these solutions.
Źródło:: Acta Physica Polonica A; 2015, 127, 6; 1577-1587
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Optimal selection of dental implant for different bone conditions based on the mechanical response
Autorzy:: Roy, S.
Das, M.
Chakraborty, P.
Biswas, J. K.
Chatterjee, S.
Khutia, N.
Saha, S.
Roychowdhury, A.
Powiązania:: https://bibliotekanauki.pl/articles/307549.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: wytrzymałość kości
implanty stomatologiczne
analiza FEM
pacjent
bone condition
porous dental implant
FE Analysis
patient specific
Opis:: Bone quality varies from one patient to another extensively; also, Young’s modulus may deviate up to 40% of normal bone quality, which results into alteration of bone stiffness immensely. The prime goal of this study is to design the optimum dental implant considering the mechanical response at bone implant interfaces for a patient with specific bone quality. Method. 3D model of mandible and natural molar tooth were prepared from CT scan data while, dental implants were modelled using different diameter, length and porosity and FE analysis was carried out. Based on the variation in bone density, five different bone qualities were considered. First, failure analysis of implants, under maximum biting force of 250N had been performed; next, the implants, those survived were selected for observing the mechanical response at bone implant interfaces under common chewing load of 120N. Result. Maximum Von Mises stress did not surpass the yield strength of the implant material (TiAl4V). However, factor of safety of 1.5 was considered and all but two dental implants survived the design stress or allowable stress. Under 120N load, distribution of Von Mises stress and strain at the bone-implant interface corresponding to the rest of the implants for five bone conditions were obtained and enlisted. Conclusion. Implants, exhibiting interface strain within 1500-3000 microstrain range show the best bone remodelling and osseointegration. So, implant models, having this range of interface strains were selected corresponding to the particular bone quality. A set of optimum dental implants for each of the bone qualities were predicted.
Źródło:: Acta of Bioengineering and Biomechanics; 2017, 19, 2; 11-20
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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