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Kambiz Sadeghi,Kitae Park,Jongchul Seo 한국포장학회 2019 한국포장학회지 Vol.25 No.2
The management of oyster shell disposal is an ongoing challenge in the southern coast of Korea because of continuously dumping the oyster shell in environment. Oyster shell wastes could be a biocidal alternative after calcination using a heat treatment. Calcined oyster shell is normally obtained through thermally conversion of CaCO3 (main component in oyster shell (96%)) into CaO. This study provides a brief overview of oyster shell disposal and its potential as an antimicrobial agent with a focus on calcination process, antimicrobial mechanisms, and packaging applications.
Kambiz Moradi,Seyyed Ehsan Mirsalehi 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.1
In this research, AA6061-T6 aluminum alloy sheets were successfully lap-joined to St14 low-carbon steel sheets through thefriction stir spot welding-brazing method with a pinless tool in the presence of a zinc interlayer. The effects of rotating speedand dwell time on the metallurgical structure and mechanical properties were investigated. It was observed that placing thepinless tool on the steel side melts the zinc interlayer and aluminum base metal and leads to forming different microstructureson both sides of the joint. The achievements demonstrated that the joints had a sound shape, and the maximum tensile-shearfailure load (TSFL) obtained for all the joints was more than 4.2 kN. The specimen produced at the rotating speed of 1200 rpmand dwell time of 15 s represented a maximum TSFL and fracture energy of 7.4 kN and 35 J, respectively. Moreover, increasingthe intermetallic layer thickness to almost 25 μm improved the TSFL. However, any further thickness growth caused anintense drop in the TSFL. The intermetallic layer, composed of brittle FeAl3and Fe2Al5phases, was formed near the Al-Znalloy interface with a great amount of Al, and this culminated in an expansion of the joint surface. Furthermore, fracturesurface analysis indicated the occurrence of a fracture at the interface. Some porosities with an average diameter of 50 to255 μm were observed for the sample having the maximum heat input at the fracture surface of the aluminum side, whichwas probably due to the zinc volatilization causing a decrease in the mechanical properties.
UV-cured coating of citric acid onto polypropylene film as an antioxidant clean label
Kambiz Sadeghi,Hanseul Kim,Hojun Shin,Jongchul Seo 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
The interface modification of inert materials, such as packaging materials, tends to introduce new functions to materials’ surface while maintaining the bulk performance. Herein, citric acid (CA) as a biochelator was immobilized on the surface of polypropylene (PP) film. To this end, glycidyl methacrylate (GMA) was photochemically polymerized onto PP film surface in the presence of benzophenone at 365 nm. Afterward, CA was immobilized on PP-g-GMA film surface through a ring-opening reaction between the oxirane ring of the PP-g-GMA film and CA. FTIR, XPS, and 13C-NMR detected chemistry change after UV-grafting of GMA and CA immobilization. Additionally, a large amount of carboxylic acid (215±11 nM) was detected on the surface of PP-g-GMA-g-CA biochelator film, which chelated 215±11 nM of Fe<SUP>3+</SUP> as a peroxidant. This biochelator film extended the lag time of vitamin C degradation and olive oil oxidation, which in turn showed an antioxidant feature after incubation with different food matrices. The overall migration and ligand stability tests confirmed non-migratory feature of this biochelator film that can practically realize the clean label in packaging science.
Kambiz Mokhtari,Mehrdad Behforouzi,Kawkab Abdul Aziz Mohammed Al Balush,Hamidreza Soltani,Norhan Ibrahim 국제이네비해양경제학회 2020 International Journal of e-Navigation and Maritime Vol.15 No.1
In the maritime industry, most perceptions, frameworks and methodologies of dealing with hazards are for their risk assessment rather than their risk management. This tendency discloses the reality that within the maritime sectors in areas like shipping, logistics, oil and gas there is a lack of coherent Quantitative Risk Management (QRM) methodology from which to understand the risk-based decisions especially for appropriate risk management such as in seaports’ terminals. Therefore, in this paper initially, during priority assessment of the identified hazards, Fuzzy Set Theory was applied to handle imprecision of the uncertain risk-based statistics to get an accurate result. In the next stage, Fuzzy Fault Tree and Fuzzy Event Tree methods were used to achieve the sequence of quantitative risk analysis. In the final step, a Fuzzy Technique for Order of Preference by Similarity to Ideal Solution tool was used for the implementation of the mitigation phase to complete and conclude the proposed QRM cycle.
Strengthening of steel hollow pipe sections subjected to transverse loads using CFRP
Kambiz Narmashiri,Ghadir Mehramiz 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.60 No.1
Nowadays using Carbon Fiber Reinforced Polymer (CFRP) has been expanded in strengthening steel structures. Given that few studies have taken about strengthening of steel hollow pipe sections using CFRP, in present study, the effects of CFRP sheets using two layers as well as in combination with additional reinforcing strips has been assessment. Strengthening of five specimens was carried out in laboratory tests. As well as numerical simulation was performed for all specimens by Finite Element Method (FEM) using ABAQUS software and high correlation between the results of numerical models with experimental data indicate the power of FEM in this field. The results of both laboratory and simulated specimens showed that load-bearing capacity of circular cross-sections can be significantly increased using CFRP retrofitting technique. Also, application of additional CFRP reinforcing strips and layers caused more strength for the strengthened specimens.
Characterisation of Melt Spun Ni-Ti Shape Memory Ribbons’ Microstructure
Kambiz Mehrabi,Mihael Brunˇcko,Albert C. Kneiss,Miodrag ˇColiˇc,Dragoslav Stamenkovic,Janko Ferˇcec,Ivan Anžel,Rebeka Rudolf 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.3
NiTi alloys are the most technologically important medical Shape Memory Alloys in a wide range of applications used in Orthopaedics, Neurology, Cardiology and interventional Radiology as guide-wires,self-expandable stents, stent grafts, inferior vena cava filters and clinical instruments. This paper discusses the use of rapid solidification by the melt spinning method for the preparation of thin NiTi ribbons for medical uses. Generally, the application of rapid solidification via melt-spinning can change the micro-structure drastically, which improves ductility and shape memory characteristics and leads to samples with small dimensions. As the increase in the wheel speed led to a reduced ribbon thickness, the cooling rate increased and, therefore, the martensitic substructure became finer. Furthermore, no transition from the crystalline phase to the amorphous phase was obtained by increasing the cooling rate, even at a wheel speed of 30 m/s. Specimens for our metallographic investigation were cut from the longitudinal cross sec-tions of melt-spun ribbons. Conventional TEM studies were carried out with an acceleration voltage of 120 kV. Additionally, the chemical composition of the samples was examined with a TEM equipped with an EDX analyser. The crystallographic structure was determined using Bragg-Brentano x-ray diffraction with Cu-Kα radiation at room temperature.
Kambiz Bahaadinbeigy,Abbas Sheikhtaheri,Farhad Fatehi,Khadijeh Moulaei 대한의료정보학회 2022 Healthcare Informatics Research Vol.28 No.1
Objectives: The aim of the present study was to develop and evaluate the usability of a telemedicine system for managementand monitoring of patients with diabetic foot. Methods: This study was conducted in four phases. In the first phase, the informationneeds and characteristics required to design the telemedicine system were identified based on a literature review. Then, in a two-stage Delphi survey, 15 experts approved the identified information needs and characteristics. The prototypetelemedicine system was then designed. In the third phase, system usability was evaluated through a semi-structured interview. In the fourth phase, users’ satisfaction with the designed system was analyzed. Results: Out of 115 information needsand required characteristics, 95 were considered in the system design. Eight main pages for enabling patient-physician interactionsand physician-physician interactions, monitoring the patient and controlling the disease process, providing medicalconsultation, and prescribing medications were considered. In the third phase, 26 distinct problems were identified. However,75% of the participants were very satisfied with the system. Conclusions: This study presents an attempt to design andevaluate a telemedicine system for the management and monitoring of patients with diabetic foot. In this system, patientsreceiving medical services or physicians who encounter rare cases can send the complete medical history, clinical test results,and videos and images related to the foot to specialist physicians. After examining the medical history or images and videos,the physician can provide the necessary medication prescriptions and laboratory tests or other recommendations.