An Investigation into the Impact of Fiber Material, Fabric Texture, Dirt Type, and Fabric Area Density on Ultrasonic Cleaning of Woven Textiles

Ali Rezaei,Ali Loghmani,Sayyed Mahdi Hejazi,Aminollah Mohammadi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

In recent years, there has been a growing interest in the application of ultrasonic cleaning techniques to textiles. However, the impact of textile properties on the cleaning performance has not been studied yet. This paper addresses this gap by systematically investigating the influence of different factors including fabric type, dirt type, and ultrasonic frequency, on the cleaning efficacy of textiles. To this end, four distinct fabric types, characterized by variations in texture, fiber material, and area density, were selected for experimentation. Additionally, two distinct dirt types, derived from chocolate milk and a carbon black-paraffin mixture, were introduced to assess their specific effects on ultrasonic cleaning. To analyze the impact of ultrasonic frequency, two transducers operating at frequencies of 19.5 Hz and 32.5 Hz were designed and fabricated. The quality of cleaning on the fabric samples, stained with the aforementioned dirt types, was evaluated using a full factorial experimental design. Measurement of washing quality was carried out employing a spectrophotometer. The findings of this investigation reveal that an increase in frequency is associated with a reduction in cleaning performance. Furthermore, the type of fabric texture directly influences the extent to which dirt stains are removed from the fabric. The choice of fiber material plays a crucial role in determining the textile's hydrophilic or hydrophobic characteristics, which, in turn, significantly impacts the bonding between textile yarn and various types of dirt. Consequently, the overall cleaning efficiency of the textile is affected by these interrelated factors.

In-vitro experimental analysis of magnetic fluid hyperthermia in soft tissue with artificial blood perfusion

Mohammad Mahdi Attar,Farzan Barati,Gita Rezaei,Behroz Adelinia 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1

Magnetic fluid exposed to an alternating magnetic field generates heat that it can be used for treatment and removal of cancerous tissue. The aim of this study is to investigate the thermal behavior of kidney tissue in magnetic fluid hyperthermia. Considering the fact that doing experiments on live tissue have some limitations, a new method is provided to test on dead tissue. In this study, an artificial circulation of the current vessels of kidney is used to make closer the behavior of dead tissue to live ones. The superparamagnetic nanoparticles with an average diameter of 20 nm have been used to heat tissue and an overview of the hardware devices needed to generate a magnetic field and to record temperature has been mentioned. Finally, the heating process has been simulated by the finite element software of Ansys. The nanoparticles injected to the tissue have a relatively spherical distribution which inevitably increases with increasing the intensity of the magnetic field and temperature difference dose. On the other hand it was observed that the rate of blood flow plays a key role in the analysis of tissue behavior and it is able to decrease the rise in temperature at most 70 %. Based on the results, it is inferred that the circulation along magnetic field intensity and dose of nanoparticles, plays a key role in the process of heating the tissue.

Blast resistance of a ceramic-metal armour subjected to air explosion: A parametric study

Mohammad Javad Rezaei,Mahdi Gerdooei,Hasan Ghaforian Nosrati 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.74 No.6

Nowadays, composite plates are widely used as high-strength structures to fabricate a dynamic loading-resistant armours. In this study, the shock load is applied by an explosion of spherical TNT charge at a specified distance from the circular composite plate. The composite plate contains a two-layer ceramic-metal armour and a poly-methyl methacrylate (PMMA) target layer. The dynamic behavior of the composite armour has been investigated by measuring the transferred effective stress and maximum deflection into the target layer. For this purpose, the simulation of the blast loading upon the composite structure was performed by using the load-blast enhanced (LBE) procedure in Ls-Dyna software. The effect of main process parameters such as the thickness of layers, and scaled distance has been examined on the specific stiffness of the structure using response surface method. After validating the results by comparing with the experimental results, the optimal values for these parameters along with the regression equations for transferred effective stress and displacement to the target have been obtained. Finally, the optimal values of input parameters have been specified to achieve minimum transferred stress and displacement, simultaneously with reducing the weight of the structure.

Gingival crevicular fluid levels of sclerostin in chronic periodontitis and healthy subjects

Esfahrood, Zeinab Rezaei,Yadegari, Zahra,Veysari, Setareh Kazemi,Kadkhodazadeh, Mahdi The Korean Association of Oral and Maxillofacial S 2018 대한구강악안면외과학회지 Vol.44 No.6

Objectives: Chronic periodontitis is a common inflammatory disease of the oral cavity that causes destruction of periodontal tissues and bone around the teeth. Sclerostin is a protein encoded by the SOST gene. In this study, gingival crevicular fluid (GCF) levels of sclerostin in patients with chronic periodontitis were compared with those of healthy subjects. Materials and Methods: In this case-control study, a total of 40 subjects were enrolled and divided into the healthy group (n=23) and chronic periodontitis group (n=17). GCF samples were collected, and the concentration of sclerostin was evaluated using enzyme-linked immunosorbent assay. Comparison of significance between groups was assessed using Mann-Whitney U test. Results: Sclerostin concentration was significantly higher in the chronic periodontitis group compared with the healthy group (P<0.005). Conclusion: Despite the limitations of this study, sclerostin can be a possible marker for assessment of periodontal health status.

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).

Optimization of Ultrasound-assisted Extraction of Phenolic Compounds from Yarrow (Achillea beibrestinii) by Response Surface Methodology

Davoud Salar Bashi,Seyyed Ali Mortazavi,Karamatollah Rezaei,Ahmad Rajaei,Mohamad Mahdi Karimkhani 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.4

An efficient ultrasound-assisted extraction (UAE)technique was applied to extract total phenolic content (TPC) from yarrow (Achillea beibrestinii). A response surface methodology was employed to evaluate the effects of 4 independent variables (temperature, pH, solvent to sample ratio, and time) on the TPC. The optimum extraction conditions were as follows: liquid to solid ratio 20, pH 6.3, extraction temperature 35oC, and extraction time 35 min. Under the above-mentioned conditions, the experimental TPC was 11.7 mg gallic acid equivalent/g dry matter. EC50 of the UAE extract at optimal conditions was found at 30.6±0.6 mg/L level and total flavonoids (TF)were obtained at 12.6±0.2 mg/10 g sample. Also, the results of HPLC analysis showed that gallic acid and pcoumaric acid were the predominant phenolic compounds in the plant.

Modeling of mechanical properties of roller compacted concrete containing RHA using ANFIS

Ebrahim Khalilzadeh Vahidi,Maryam Mokhtari Malekabadi,Abbas Rezaei,Mohammad Mahdi Roshani,Gholam Hossein Roshani 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.4

In recent years, the use of supplementary cementing materials, especially in addition to concrete, has been the subject of many researches. Rice husk ash (RHA) is one of these materials that in this research, is added to the roller compacted concrete as one of the pozzolanic materials. This paper evaluates how different contents of RHA added to the roller compacted concrete pavement specimens, can influence on the strength and permeability. The results are compared to the control samples and determined optimal level of RHA replacement. As it was expected, RHA as supplementary cementitious materials, improved mechanical properties of roller compacted concrete pavement (RCCP). Also, the application of adaptive neuro-fuzzy inference system (ANFIS) in predicting the permeability and compressive strength is investigated. The obtained results shows that the predicted value by this model is in good agreement with the experimental, which shows the proposed ANFIS model is a useful, reliable, fast and cheap tool to predict the permeability and compressive strength. A mean relative error percentage (MRE %) less than 1.1% is obtained for the proposed ANFIS model. Also, the test results and performed modeling show that the optimal value for obtaining the maximum compressive strength and minimum permeability is offered by substituting 9% and 18% of the cement by RHA, respectively.

Oil supplementation improved growth and diet digestibility in goats and sheep fed fattening diet

Su Chui Len Candyrine,Mohammad Faseleh Jahromi,Mahdi Ebrahimi,Wei Li Chen,Siamak Rezaei,Yong Meng Goh,Norhani Abdullah,Juan Boo Liang 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.4

Objective: This study evaluated the growth, digestibility and rumen fermentation between goats and sheep fed a fattening diet fortified with linseed oil. Methods: Twelve 3 to 4 months old male goats and sheep were randomly allocated into two dietary treatment groups in a 2 (species)×2 (oil levels) factorial experiment. The treatments were: i) goats fed basal diet, ii) goats fed oil-supplemented diet, iii) sheep fed basal diet, and iv) sheep fed oil-supplemented diet. Each treatment group consisted of six animals. Animals in the basal diet group were fed with 30% alfalfa hay and 70% concentrates at a rate equivalent to 4% of their body weight. For the oil treatment group, linseed oil was added at 4% level (w:w) to the concentrate portion of the basal diet. Growth performance of the animals was determined fortnightly. Digestibility study was conducted during the final week of the feeding trial before the animals were slaughtered to obtain rumen fluid for rumen fermentation characteristics study. Results: Sheep had higher (p<0.01) average daily weight gain (ADG) and better feed conversion ratio (FCR) than goats. Oil supplementation did not affect rumen fermentation in both species and improved ADG by about 29% and FCR by about 18% in both goats and sheep. The above enhancement is consistent with the higher dry matter and energy digestibility (p<0.05), as well as organic matter and neutral detergent fiber digestibility (p<0.01) in animals fed oil- supplemented diet. Sheep had higher total volatile fatty acid production and acetic acid proportion compared to goat. Conclusion: The findings of this study suggested that sheep performed better than goats when fed a fattening diet and oil supplementation at the inclusion rate of 4% provides a viable option to significantly enhance growth performance and FCR in fattening sheep and goats.