Incorporation of MIL-101(Fe)/Tannic acid-PEG to PES-TPU blend membrane to modify a membrane with riveting mechanical stability and separation performance

Hossein Mahdavi,Farzad Hosseini,Roham Ghanbari 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-

A certain amount of thermoplastic polyurethane (TPU) was added to polyethersulfone (PES) to ensurehigher mechanical stability. The tannic acid-polyethylene glycol (TA-PEG) and aminated metal-organicframework-101 (Fe) (MIL-101(Fe)) were incorporated into the membrane matrix separately, then anequal mass ratio of each was incorporated into the membrane matrix, and the results were compared. The optimized membrane with dual nanoparticles elucidates a high-water permeation rate that reached8.12 L/m2.h.bar, which is almost 4 times higher than the PES-TPU pristine membrane. The optimummembrane provided a high dye rejection property (98.3 ± 0.4 %, 98.9 ± 0.3 %, 99.0 ± 0.3 %, 99.4 ± 0.2 %,and 99.7 ± 0.2 %) for Methylene Blue (MB), Crystal Violet (CV), Methyl Green (MG), Direct Red-16 (DR-16), and Direct Yellow-29 (DY-29), respectively. Subsequently, significant antifouling features(FRR = 91.2 % for the optimized membrane) were obtained, and irreversible fouling dropped remarkably. The long-term water permeation and rejection rates were also investigated, and it was found that theoptimized membrane enhanced in both, where even after 10 days, the optimized membrane maintainedits initial rejection rate for all tested dyes.

Synergistic effect of GO@SiO2 and GO@ZnO nano-hybrid particles with PVDF-g-PMMA copolymer in high-flux ultrafiltration membrane for oily wastewater treatment and antifouling properties

Hossein Mahdavi,Mohammad Amin Kerachian,Mehri Abazari 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-

In the Ultrafiltration (UF) region, the development of the membranes with ultra-water permeability andextraordinary oil rejection at the same time is highly desirable. Herein, a copolymer/nano-hybrid particlesmixed matrix membrane was fabricated with high hydrophilicity and oil-in-water separation performance,originating from the synergistic effect between the prepared copolymer and nanoparticles. Accordingly, atom transfer radical polymerization (ATRP) method, especially considered as a promisinggrafting technique to modify polyvinylidene fluoride (PVDF), was utilized for the synthesis of thePVDF-g-PMMA copolymer. Furthermore, two different nano-hybrid particles including graphene oxide(GO) sheets separately decorated with ZnO and SiO2 were also synthesized. Then, different membranecompositions with various GO@ZnO and GO@SiO2 contents were fabricated, and then, the synergisticeffect of each nano-hybrid particle with the PVDF-g-PMMA copolymer was evaluated. The preparedGO@ZnO and GO@SiO2 were used not only to modify ultrafiltration (UF) membranes for oil rejectionbut also to prevent protein BSA adsorption on the membrane surface based on their surface charge. The 4 wt.% PVDF-g-PMMA/0.3 wt.% GO@SiO2 and 4 wt.% PVDF-g-PMMA/0.3 wt.% GO@ZnO membranesprovided outstanding separation performance (soybean oil rejections of 93.4% and 95.2%, respectively)and ultra- water permeability (312 and 326 L/m2.h.bar, respectively). Based on the results in terms ofseparation and filtration performances, the M5 membrane exhibited more efficient performance thanM4 membrane. By increasing the amount of nano-hybrid particles, the overall finger-like voids, averagepore size, and surface roughness of membranes decreased, making them ideal for application in the watertreatment field. Also, the influence of hydrophilicity and charge density of GO@ZnO and GO@SiO2 nanohybridparticles with the copolymer in the PVDF membrane was examined through conducting theantifouling experiment in two different pH values, in which a great performance was also obtained. Compared to previous researches, GO@ZnO and GO@SiO2 nano-hybrid particles with the copolymer inthe PVDF membrane not only can generate ultra-high water permeability in low pressure but also provide>93% oil-in-water emulsion rejections.

A novel ternary Pd-GO/N-doped TiO2 hierarchical visible-light sensitive photocatalyst for nanocomposite membrane

Hossein Mahdavi,Mahdi Rezaei,Leila Ahmadian-Alam,Mostafa Mohammadpour Amini 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.6

We investigated the visible-light sensitive photocatalytic ability of a designed ternary Pd-GO/TiON nanocomposite for use as an effective photocatalyst in membranes. We succeeded in synthesizing the TiO2-based photocatalyst for Suzuki coupling reaction and application of this photocatalyst for fabricating high performance photocatalytic membrane. In this regard, palladium metal as a complementary metal in combination with N-doped TiO2 (TiON) and graphene oxide (GO) nanosheets was utilized to synthesize the upgraded version of the visible light sensitive nanocomposite photocatalyst. The synthesis of Pd-GO/TiON hierarchical nanostructure was confirmed by detecting Ti, Pd, C, O and N elements by X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray (EDX) and EDX mapping analysis. Then, a series of PVDF-based photocatalytic nanocomposite membranes (PhNMs) filled with Pd-GO/TiON was fabricated. Evaluating the yield of Pd-GO/TiON photocatalyst was around 99% and 70% for heterogeneous system and the prepared PhNM containing 3% Pd-GO/TiON, respectively. Although, yield of Pd-GO/TiON photocatalyst in membrane is not comparable with the high yield reported by other researchers in heterogeneous system; however, it can be considered as a valuable result because of the importance of photocatalytic reactions and the environmental advantages of membrane technology. Furthermore, various analyses were also performed to study the synthesized photocatalysts and the prepared photocatalytic membranes, including thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and diffuse reflectance spectrophotometry (DRS).

TFC solvent-resistant nanofiltration membrane prepared via a gyroid-like PE support coated with polydopamine/Tannic acid-Fe(III)

Ali Akbar Heidari,Hossein Mahdavi,Peyman Khodaei Kahriz 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-

Solvent resistant nanofiltration (SRNF) is now a powerful tool for addressing environmental issues. Hence, we report the fabrication of a thin film composite (TFC) membrane comprised of a novel HDPEsupport, a polydopamine (PDA)/Tannic acid-Fe(III) interlayer and a polyamide (PA) skin layer. In thisrespect, high density polyethylene (HDPE)-polystyrene (PS)-styrene-ethylene-butylene-styrene (SEBS)blends were formed with different compositions by mixing via a Brabender machine and making filmsby using a hot press instrument. Next, a solvent extraction technique was employed for extracting thedispersed phase and making the HDPE membranes. The support membrane with optimum propertieswas coated with a PDA interlayer. A tannic acid-Fe(III) interlayer was also formed on the as-preparedPDA layer so that the hydrophilicity of the support surface was enhanced to form a defect-free PA layer. The modified support was utilized for the fabrication of the PA top layer by using m-phenylene diamine(MPD) and trimesoyl chloride (TMC) monomers. The prepared TFC membrane provided a significant dyerejection ability (99.9% Direct Yellow, 99.7% Methyl Green, 99.2% Rhodamine B, and 96.1% MethylOrange), extraordinary solvent resistance ability in harsh solvents, and good methanol (MeOH) Flux(2.25 L/m2.h.bar) in SRNF applications. The skin-substrate adhesion strength of the top layer was alsoevaluated by a back-ward flush operation. It was demonstrated that the interlayer and the skin layerhad an excellent adhesion with the support membrane.

Other Side of Breast Cancer: Factors Associated with Caregiver Burden

Maryam Vahidi,Nader Mahdavi,Elnaz Asghari,Hossein Ebrahimi,Jamal Eivazi Ziaei,Mina Hosseinzadeh,Hossein Namdar Areshtanab,Iraj Asvadi Kermani 한국간호과학회 2016 Asian Nursing Research Vol.10 No.3

Purpose: This study aimed to determine factors associated with caregiver burden among primary caregivers of women with breast cancer in Iran. Methods: This was a descriptive correlation study conducted in 2012 on 150 main caregivers of patients with breast cancer who came to the oncology clinic of Shahid Ghazi hospital in Tabriz, Iran. A questionnaire which included caregiving-related factors and the Zarit Burden Interview was used for data collection after its validity and reliability were determined. Data was analyzed using SPSS 13.0 software with descriptive and analytic statistics. The association between significant variables and the dependent variable with an observation of the effects of other variables was assessed using the multiple linear regression model. Results: The mean age of caregivers was 39.60 ± 13.80 years old, and 77 (51.3%) of them were men. The mean score of the Zarit Burden Interview was 30.55 ± 19.18. In the regression model, the mean score of activities of daily living, level of education, gender, and financial status were identified as the determining factors of the burden of caregivers. Conclusions: Primary caregivers need to be financially supported by the relevant organizations. Care skills training and providing palliative care seem helpful in reducing the pain and the burden of family caregivers for patients with breast cancer.

An Approach to Scheduling Bursty Traffic

Mahmoud Daneshvar Farzanegan,Hossein Saidi,Mehdi Mahdavi 한국전자통신연구원 2014 ETRI Journal Vol.36 No.1

The scheduling scheme in packet switching networks isone of the most critical features that can affect theperformance of the network. Hence, many schedulingalgorithms have been suggested and some indices, such asfairness and latency, have been proposed for thecomparison of their performances. While the nature ofInternet traffic is bursty, traditional scheduling algorithmstry to smooth the traffic and serve the users based on thissmoothed traffic. As a result, the fairness index mainlyconsiders this smoothed traffic and the service rate as themain parameter to differentiate among different sessionsor flows. This work uses burstiness as a differentiatingfactor to evaluate scheduling algorithms proposed in theliterature. To achieve this goal, a new index that evaluatesthe performance of a scheduler with bursty traffic isintroduced. Additionally, this paper introduces a newscheduler that not only uses arrival rates but alsoconsiders burstiness parameters in its schedulingalgorithms.

Time-domain Spectral Element Method for Impact Identification of Frame Structures using Enhanced GAs

Zexing Yu,Seyed Hossein Mahdavi,Chao Xu 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.2

This paper develops an Enhanced Genetic Algorithm (GA) strategy in conjunction with a time-domain Spectral Finite Element Method (SFEM) for impact identification of framed structures. For this purpose, a spatial truss spectral element is proposed for impact response simulation. In this regard, Gauss-Lobatto-Legendre quadrature rules and points configuration are adopted to construct a diagonal matrix and to gain an optimum computational demands. A decimal and a mixed GA coding system are implemented to locate and re-construct the impact features, respectively. An improved GA-based fitness assessment is designed to significantly accelerate the convergence rate of the optimization strategy. The impact identification of two frame structures is investigated taking into account the influence of externally applied loading. It is concluded that, the proposed mixed coding GA strategy effectively overcomes the main drawbacks of classical GA approach. The developed SFEM is superior to conventional FEM because of its high order interpolation and integration rules. For large structures, impact localization is successfully accomplished very fast, which provides the excellent ability in developing an on-line health monitoring system. It is included that, the robustness of the proposed SFEM lies on the considerably higher computational efficiency in achieving the most accurate results with the lesscomputational costs.

Feature Extraction based on modified Discriminant Independent Component Analysis via Particle Swarm Optimization

Maryam Mollaee,Mohammad Hossein Moattar,Seyyed Javad Seyyed Mahdavi 보안공학연구지원센터 2014 International Journal of Software Engineering and Vol.8 No.12

In this paper, a new method based on Particle Swarm Optimization (PSO) for independent component analysis(ICA) is presented which can be applied for feature extraction. Due to the drawbacks of the Gradient method, it is replaced by PSO in Discriminant Independent Component Analysis (dICA ) algorithm in the proposed approach. The Gradient method may lead to local optimal and it cannot solve the problem of slow convergence since it includes a learning step which needs to be determined in advance. Moreover, Gradient-based techniques cannot achieve high level of accuracy because of the considerable complexity involved in ICA. The additional complexity of the Gradient-based algorithms leads to pseudo-optimal scenarios. The Discriminant Independent Component Analysis based on PSO is used to overcome these serious shortcomings. Most of the datasets used for simulation in this study are obtained from UCI repository. The results obtained using linear discriminant analysis (LDA), principal component analysis (PCA) and gradient-based dICA are compared with those obtained by PSO-dICA . The results show improvement in classification with PSO-dICA method compared to other methods. In other words, PSO-dICA method bought about classifier error reduction.

The Effect of Carum Copticum Extract on Acetylcholine Induced Contraction in Isolated Rat’s Ileum

Seyed Hassan Hejazian-Y,Mohammad Hossein Dashti-R,Seyed Majid Mahdavi,Masood Anvar Qureshi 사단법인약침학회 2009 Journal of Acupuncture & Meridian Studies Vol.2 No.1

Aims: There are many biological investigations for determining an effective cure for the dysfunction of gastrointestinal tracts, using herbal medicine. It has been reported that Carum Copticum is a bactericidal agent and possesses anticholinergic, antihistaminic and β-adrenergic stimulatory effects in some tissues. However, these effects of Carum Copticum on mechanical activities of isolated intestine are not clearly identified yet. The present study has been designed to find out the specific effects of Carum Copticum on mechanical activity of isolated rat’s ileum. Materials and Methods: In this study rat’s ileum contraction was recorded through an isolated tissue chamber in an organ bath by using isotonic transducer and oscillographic device. The effect of Carum Copticum extract on acetylcholine induced contraction in isolated rat’s ileum was evaluated. Results: Our findings showed that 1% aqueous extract of Carum Copticum reduces the basal contractile activity of rat’s ileum. The extract also reduced acetylcholine induced contraction to 40% of its maximum response. The inhibitory action of Carum Copticum extract on acetylcholine induced contraction was similar but slower than that of atropine sulfate. Conclusion: The results of this study showed an inhibitory effect of Carum Copticum extract on acetylcholine induced contraction in rat’s ileum. Aims: There are many biological investigations for determining an effective cure for the dysfunction of gastrointestinal tracts, using herbal medicine. It has been reported that Carum Copticum is a bactericidal agent and possesses anticholinergic, antihistaminic and β-adrenergic stimulatory effects in some tissues. However, these effects of Carum Copticum on mechanical activities of isolated intestine are not clearly identified yet. The present study has been designed to find out the specific effects of Carum Copticum on mechanical activity of isolated rat’s ileum. Materials and Methods: In this study rat’s ileum contraction was recorded through an isolated tissue chamber in an organ bath by using isotonic transducer and oscillographic device. The effect of Carum Copticum extract on acetylcholine induced contraction in isolated rat’s ileum was evaluated. Results: Our findings showed that 1% aqueous extract of Carum Copticum reduces the basal contractile activity of rat’s ileum. The extract also reduced acetylcholine induced contraction to 40% of its maximum response. The inhibitory action of Carum Copticum extract on acetylcholine induced contraction was similar but slower than that of atropine sulfate. Conclusion: The results of this study showed an inhibitory effect of Carum Copticum extract on acetylcholine induced contraction in rat’s ileum.

Helicobacter pylori vacA d1 Genotype Predicts Risk of Gastric Adenocarcinoma and Peptic Ulcers in Northwestern Iran

Basiri, Zeinab,Safaralizadeh, Reza,Bonyadi, Morteza Jabbarpour,Somi, Mohammad Hossein,Mahdavi, Majid,Latifi-Navid, Saeid Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.4

Background: There is a close relationship between Helicobacter pylori (H pylori)-specific factors and different gastroduodenal diseases. The present study aimed to investigate the prevalence of vacA d1, d2 genotypes in the H pylori isolates from patients with gastric adenocarcinoma, peptic ulcer disease (PUD) and gastritis in East Azerbaijan region, where the incidence of gastric cancer (GC) is high. Strains isolated from this area are likely to be of European ancestry. Materials and Methods: In this study, genotyping of the vacA d region of 115 isolates obtained from patients with different gastrodoudenal diseases was accomplished by PCR methods. In addition to PCR amplification of H pylori 16S rDNA, rapid urease tests or histological examination were used to confirm the presence of H pylori in biopsy specimens. Data were collected and analyzed using SPSS version 19. Results: Of the total of 83 H pylori isolates, 36 (43.4%) contained the d1 allele and 47 (56.6%) were subtype d2. The results of the multiple linear/logistic regression analysis showed high correlation between allele d1 and gastric adenocarcinoma or PUD. Conclusions: This study suggests that the H pylori vacA d1 genotype helps predict risk for gastric adenocarcinoma and PUD in East Azerbaijan, Iran.