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Nahid Ghasemi,Maryam Ghasemi,Saleh Moazeni,Parisa Ghasemi,Njud S. Alharbi,Vinod Kumar Gupta,Shilpi Agarwal,Irina V. Burakova,Alexey G. Tkachev 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
In this study, a novel adsorbent, dioctylphetalate triethylenetetraamine magnetic nanoparticles (DOP-TETA-MNP) via a solvent-free procedure were synthesized for the removal of Zn (II) ions from aqueous solution. The morphological and anatomical characterization was investigated by various analytical techniques such as FTIR and SEM. Experimental data from evaluation of various influential parameters such as initial pH (2–7), initial ion concentration (5–20 mg/L), adsorbent dose (0.005–0.040 g), contact time (5–120 min) and temperature (308–333 K) of the solution were carried out using a batch adsorption method. DOP-TETA-MNP can be simply separated from aqueous solution with magnetic separations at low magnetic field. The kinetic data of Zn (II) ions were found to follow the pseudo-second-order kinetic model and the equilibrium data of ions sorption were well described by Langmuir isotherm model. The maximum monolayer sorption capacity of Zn (II) was estimated to be 24.21 mg/g at temperature of 333 K. Thermodynamic analyses show that the adsorption process is exothermic and spontaneous.
Ghasemi, Khaled,Rezvani, Ali Reza,Razak, Ibrahim Abdul,Moghimi, Abolghasem,Ghasemi, Fatemeh,Rosli, Mohd Mustaqim Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
The synthesis, X-ray crystallography, spectroscopic (IR, UV-vis), and electrochemical properties of the title compound, $[H_3O][Cr(dipic)_2][H_3O^+.Cl^-]$ (1), ($H_2dipic$ = 2,6-pyridinedicarboxylic acid), are reported. This complex crystallizes in the monoclinic space group Cc with a = 14.9006(10) ${\AA}$, b = 12.2114(8) ${\AA}$, c = 8.6337(6) ${\AA}$, ${\alpha}=90.00^{\circ}$, ${\beta}=92.7460(10)^{\circ}$, ${\gamma}=90.00^{\circ}$, and V = 1569.16(18) ${\AA}^3$ with Z = 4. The hydrogen bonding and noncovalent interactions play roles in the stabilization of the structure. In order to gain a better understanding of the most important geometrical parameters in the structure of the complex, atoms in molecules (AIM) method at B3LYP/6-31G level of theory has been employed.
Khaled Ghasemi,Ali Reza Rezvani,Ibrahim Abdul Razak,Abolghasem Moghimi,Fatemeh Ghasemi,Mohd Mustaqim Rosli 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
The synthesis, X-ray crystallography, spectroscopic (IR, UV-vis), and electrochemical properties of the title compound, [H3O][Cr(dipic)2] [H3O+.Cl−] (1), (H2dipic = 2,6-pyridinedicarboxylic acid), are reported. This complex crystallizes in the monoclinic space group Cc with a = 14.9006(10) Å, b = 12.2114(8) Å, c = 8.6337(6) Å, α = 90.00°, β = 92.7460(10)°, γ = 90.00°, and V = 1569.16(18) Å3 with Z = 4. The hydrogen bonding and noncovalent interactions play roles in the stabilization of the structure. In order to gain a better understanding of the most important geometrical parameters in the structure of the complex, atoms in molecules (AIM) method at B3LYP/6-31G level of theory has been employed.
M. Ghasemi,M. Naushad,N. Ghasemi,Y. Khosravi-fard 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The main goal of this study was to evaluate the performance of two new adsorbents, ash and Fe nanoparticles loaded ash (nFe-A) for the removal of Pb(II) from aqueous solution. Batch experiments were performed as a function of various experimental parameters. The adsorption studies included both equilibrium adsorption isotherms and kinetics. Equilibrium data fitted very well with the Langmuir isotherm model. Kinetics studies showed better applicability for pseudo-second-order model for both adsorbents. The regeneration studies showed promising regeneration potential of these adsorbents. The breakthrough capacities of ash and nFe-A for Pb(II) removal was found 25 and 30 mg g 1, respectively.
M. Ghasemi,Mu. Naushad,N. Ghasemi,Y. Khosravi-fard 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
Fig sawdust was used as a precursor for the production of activated carbon by chemical activation withH3PO4. The developed Fig sawdust activated carbon (FSAC) was used as a biosorbent for the removal ofPb(II) from aqueous solution. Highest adsorption of Pb(II) (95.8%) was found at pH 4. Equilibrium datafitted very well with the Langmuir isotherm model. Maximum adsorption capacity was determined80.645 mg g1 at pH 4. Kinetic studies demonstrated that the adsorption followed a pseudo second orderkinetics model. The negative value of DG8 confirmed the feasibility and spontaneity of FSAC for Pb(II)adsorption.
Investigation of Microstructure and Wear Properties of Plasma Nitrided Astaloy Mo
Mahsa Haji Ghasemi,Behrooz Ghasemi,Hamid Reza Mohamadian Semnani 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
In this research, plasma nitridation is carried out on the as-sintered and hardened Astaloy Mo in order to improve the wearbehavior of PM parts. The starting materials including pre-alloyed powders with 0.8% graphite were pressed at diff erentpressures. Next, the specimens were sintered at 1120 °C for 30 min, in the N 2 /H 2 atmosphere. The eff ects of density and coolingrate were studied on the microhardness, microstructure, and wear performance of as-sintered and hardened specimens. X-ray technique, scanning electron microscopy, and energy dispersive spectroscopy were used for phase transformation,morphology characterization, and elemental analysis, respectively. The results showed that plasma nitridation and an increasein cooling rate and density up to 6.8 g/cm 3 resulted in a change in wear resistance. Moreover, the wear performance of densesamples was decreased due to the enhanced three-body abrasive mechanism.
Ghasemi, Mohammad R.,Ghasri, Mehdi,Salarnia, Abdolhamid Techno-Press 2022 Advances in computational design Vol.7 No.4
Due to their natural and social revelation, also their ease and flexibility, human collective behavior and teamwork sports are inspired to introduce optimization algorithms to solve various engineering and scientific problems. Nowadays, meta-heuristic algorithms are becoming some striking methods for solving complex real-world problems. In that respect in the present study, the authors propose a novel meta-innovative algorithm based on soccer teamwork sport, suitable for optimization problems. The method may be referred to as the Soccer League Optimization-based Championship Algorithm, inspired by the Soccer league. This method consists of two main steps, including: 1. Qualifying competitions and 2. Main competitions. To evaluate the robustness of the proposed method, six different benchmark mathematical functions, and two engineering design problem was performed for optimization to assess its efficiency in achieving optimal solutions to various problems. The results show that the proposed algorithm may well explore better performance than some well-known algorithms in various aspects such as consistency through runs and a fast and steep convergence in all problems towards the global optimal fitness value.
Ghasemi Mahshid,Bajouri Amir,Shafiiyan Saeed,Aghdami Nasser 한국조직공학과 재생의학회 2020 조직공학과 재생의학 Vol.17 No.6
To discuss the advantages and limitations of hair follicle-derived cell transplantation (FCT) in vitiligo, compared to the epidermal cell transplantation (ECT), and the knowledge gap which is required to be bridged. The papers relevant to the purpose was reviewed. Surgical approaches for treating vitiligo are based on the idea of replenishing lost melanocytes. Skin and hair follicles as the main sources of melanocytes have been applied for this purpose transferring the whole tissue or tissue-derived cell suspension to the vitiligo lesions. Considering the differences between hair follicle and epidermis in terms of the constituting cell populations, phenotype and function of melanocytes, and micro-environmental factors, different response of vitiligo patients to treatment with FCT or ECT would be expected theoretically. However, there is currently a lack of evidence on such a difference. However, ECT appears to be a more feasible, less time-consuming, and more comfortable treatment for both physicians and patients. Although the current evidence has not shown a significant difference between ECT and FCT in terms of efficacy, ECT appears to be more feasible specifically in the treatment of large lesions. However, further randomized controlled clinical trials with larger sample sizes and longer follow-up durations are required to be conducted to draw a definite conclusion on comparing FCT with ECT in terms of the safety, efficacy, durability of the therapeutic effects, and indications in vitiligo patients.
Surprising Incentive: An Instrument for Promoting Safety Performance of Construction Employees
Ghasemi, Fakhradin,Mohammadfam, Iraj,Soltanian, Ali Reza,Mahmoudi, Shahram,Zarei, Esmaeil Occupational Safety and Health Research Institute 2015 Safety and health at work Vol.6 No.3
Background: In comparison with other industries, the construction industry still has a higher rate of fatal injuries, and thus, there is a need to apply new and innovative approaches for preventing accidents and promoting safe conditions at construction sites. Methods: In this study, the effectiveness of a new incentive system-the surprising incentive system-was assessed. One year after the implementation of this new incentive system, behavioral changes of employees with respect to seven types of activities were observed. Results: The results of this study showed that there is a significant relationship between the new incentive system and the safety performance of frontline employees. The new incentive system had a greater positive impact in the first 6 months since its implementation. In the long term, however, safety performance experienced a gradual reduction. Based on previous studies, all activities selected in this study are important indicators of the safety conditions at workplaces. However, there is a need for a comprehensive and simple-to-apply tool for assessing frontline employees' safety performance. Shortening the intervals between incentives is more effective in promoting safety performance. Conclusion: The results of this study proved that the surprising incentive would improve the employees' safety performance just in the short term because the surprising value of the incentives dwindle over time. For this reason and to maintain the surprising value of the incentive system, the amount and types of incentives need to be evaluated and modified annually or biannually.
Ghasemi Arman,Ramazani Mazaher,Bakhshi Saeed Reza,Al-Khafaji Ali Hussein Demin,Zahabi Saeed,Loghman Estarki Mohammad Reza,Zamani Abbas 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.4
This research aims to fabricate and develop a composite brake disc made of carbon/silicon carbide. For this purpose, the first silicon carbide nanoparticles were ultrasonicated with alumina sintering aid and carbon fi ber (between 10 and 20%) with different lengths of 3 mm, 10 mm, and 15 mm. Next, the fi nal Cf/SiC composite bulk was made-up via the spark plasma sintering (SPS) method. After that, the effect of different lengths of carbon fiber was explored on the porosity, coefficient of friction, fracture toughness, thermal conductivity, and microhardness of samples. The results showed that the density of sintered samples with a carbon fiber length of 10 mm was higher than that of samples with fiber lengths of 3 and 15 mm. Also, the hardness (25.79 GPa) and fracture toughness (5.72 MPa.m 1/2) of this sample were higher than those of the samples sintered with carbon fiber lengths of 3 and 15 mm. Further, this sample with the maximum density showed a coefficient of friction (COF) of 0.43. Since for aeroplane brake discs, the COF should be between 0.3 and 0.4, and the porosity of sam- ples should range within 3–5%, the samples sintered with the carbon fiber length of 10 mm had the nearby features to the preferred air brake disc indices.