http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Durability of RC Structures against Carbonation-Induced Corrosion under the Impact of Climate-Change
Mohammad Ghanooni-Bagha,Mohammad Reza YekeFallah,Mohsen Ali Shayanfar 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.1
The factors associated with concrete carbonation can be classified in three major categories of environmental factors, concrete’s internal-structural factors, and construction-operation conditions. Climate change is expected to cause gradual change in many primary environmental factors, which may accelerate reinforcement corrosion in reinforced concrete (RC) structures. Studies show that CO2 concentration in the atmosphere may rise from 379 ppm in 2005 to 1,000 ppm in 2100. Hence, adoption of suitable measures to protect exposed RC members against carbonation-induced corrosion is essential for countering the future environmental effects which, in turn, requires further investigation on the effect of critical structural factors, such as water-cement ratio and cement content in the concrete mix design, and construction-operation factors, such as concrete cover depth and surface protection, on the durability of RC members. In this study, these factors were investigated through Monte Carlo simulation. The results showed that slight adjustments in some structural and operational factors can significantly reduce the risk of corrosion initiation and ultimately improve the durability of concrete members against corrosion. The effect of each parameter on the probability of corrosion initiation during the design life of a RC structure was analyzed and interpreted using numerical examples.
Feedback control strategies for active control of noise inside a 3-D vibro-acoustic cavity
Ashok K. Bagha,Subodh V. Modak 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.20 No.3
This paper presents and compares three feedback control strategies for active control of noise inside a 3-D vibro-acoustic cavity. These are a) control strategy based on direct output feedback (DOFB) b) control strategy based on linear quadratic regulator (LQR) to reduce structural vibrations and c) LQR control strategy with a weighting scheme based on structural-acoustic coupling coefficients. The first two strategies are indirect control strategies in which noise reduction is achieved through active vibration control (AVC), termed as AVC-DOFB and AVC-LQR respectively. The third direct strategy is based on active structural-acoustic control (ASAC). This strategy is an LQR based optimal control strategy in which the coupling between the various structural and the acoustic modes is used to design the controller. The strategy is termed as ASAC-LQR. A numerical model of a 3-D rectangular box cavity with a flexible plate (glued with piezoelectric patches) and with other five surfaces treated rigid is developed using finite element (FE) method. A single pair of collocated piezoelectric patches is used for sensing the vibrations and applying control forces on the structure. A comparison of frequency response function (FRF) of structural nodal acceleration, acoustic nodal pressure, and piezoelectric actuation voltage is carried out. It is found that the AVC-DOFB control strategy gives equal importance to all the modes. The AVC-LQR control strategy tries to consume the control effort to damp all the structural modes. It is seen that the ASAC-LQR control strategy utilizes the control effort more intelligently by adding higher damping to those structural modes that matter more for reducing the interior noise.
MODULE AMENABILITY OF BANACH ALGEBRAS AND SEMIGROUP ALGEBRAS
Khoshhal, M.,Bagha, D. Ebrahimi,Rahpeyma, O. Pourbahri The Honam Mathematical Society 2019 호남수학학술지 Vol.41 No.2
We define the concepts of the first and the second module dual of a Banach space X. And also bring a new concept of module amenability for a Banach algebra ${\mathcal{A}}$. For inverse semigroup S, we will give a new action for ${\ell}^1(S)$ as a Banach ${\ell}^1(E_S)$-module and show that if S is amenable then ${\ell}^1(S)$ is ${\ell}^1(E_S)$-module amenable.
Module amenability of Banach algebras and semigroup algebras
M. Khoshhal,D. Ebrahimi Bagha,O. Pourbahri Rahpeyma 호남수학회 2019 호남수학학술지 Vol.41 No.2
We define the concepts of the first and the second module dual of a Banach space $X$. And also bring a new concept of module amenability for a Banach algebra $\mathcal{A}$. For inverse semigroup $S$, we will give a new action for $\ell^1(S)$ as a Banach $\ell^1(E_S)$-module and show that if $S$ is amenable then $\ell^1(S)$ is $\ell^1(E_S)$-module amenable.
MODULE AMENABILITY AND MODULE ARENS REGULARITY OF WEIGHTED SEMIGROUP ALGEBRAS
Asgari, Gholamreza,Bodaghi, Abasalt,Bagha, Davood Ebrahimi Korean Mathematical Society 2019 대한수학회논문집 Vol.34 No.3
For every inverse semigroup S with subsemigroup E of idempotents, necessary and sufficient conditions are obtained for the weighted semigroup algebra $l^1(S,{\omega})$ and its second dual to be $l^1(E)$-module amenble. Some results for the module Arens regularity of $l^1(S,{\omega})$ (as an $l^1(E)$-module) are found. If S is either of the bicyclic inverse semigroup or the Brandt inverse semigroup, it is shown that $l^1(S,{\omega})$ is module amenable but not amenable for any weight ${\omega}$.
Character amenability for a Banach module
FATEMEH ANOUSHEH,DAVOOD EBRAHIMI BAGHA,Abasalt Bodaghi 장전수학회 2016 Advanced Studies in Contemporary Mathematics Vol.26 No.2
For a Banach algebra A and a Banach A-bimodule E, we in- troduce and study the concepts of △-Φ-amenability and △-Φ-contractibility of the Banach bimodule E, where Φ is a homomorphism from A into C and △ : E-> A is a bounded Banach A-bimodule homomorphism.
MODULE AMENABILITY OF MODULE LAU PRODUCT OF BANACH ALGEBRAS
( Hojat Azaraien ),( Davood Ebrahimi Bagha ) 호남수학회 2020 호남수학학술지 Vol.42 No.3
Let A, B, U be Banach algebras and B be a Banach U-bimodule also A be a Banach B-U-module. In this paper we study the relation between module amenability, weak module amenability and module approximate amenability of module Lau product A×<sub>α</sub> B and that of Banach algebras A, B.
Mousa Sadeghi-Kiakhani,Siyamak Safapour,Fahimeh Sabzi,Ali Reza Tehrani-Bagha 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
Low-energy UV lamps were used for the pretreatment of wool yarns and its effects were investigated in terms ofsurface morphology, tensile strength, and percentage dye uptake. Subsequently, raw and UV-treated wool yarns were dyedwith Cochineal dye and the essential parameters affecting the dyeing process (i.e., temperature, pH, duration) weredetermined. The results showed that the color strength of the samples increased by (a) increasing the pre-treatmenteffectiveness (i.e., UV irradiation strength and its duration), and (b) increasing the influential dyeing parameters (i.e., highertemperature, higher initial dye concentration in the dye bath, longer dyeing time, and acidic pH). The UV irradiationpretreatment also enhanced the color fastness properties of the dyed samples under the same dyeing conditions. The resultssuggested that an eco-friendly, acid-free, and relatively cheaper dyeing process could be developed for the wool fiberspretreated with scalable and straightforward UV irradiation pretreatment.