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AlAgha, Iyad Korea Institute of Science and Technology Informat 2021 Journal of Information Science Theory and Practice Vol.9 No.1
The study reported in this paper aimed to evaluate the topics and opinions of COVID-19 discussion found on Twitter. It performed topic modeling and sentiment analysis of tweets posted during the COVID-19 outbreak, and compared these results over space and time. In addition, by covering a more recent and a longer period of the pandemic timeline, several patterns not previously reported in the literature were revealed. Author-pooled Latent Dirichlet Allocation (LDA) was used to generate twenty topics that discuss different aspects related to the pandemic. Time-series analysis of the distribution of tweets over topics was performed to explore how the discussion on each topic changed over time, and the potential reasons behind the change. In addition, spatial analysis of topics was performed by comparing the percentage of tweets in each topic among top tweeting countries. Afterward, sentiment analysis of tweets was performed at both temporal and spatial levels. Our intention was to analyze how the sentiment differs between countries and in response to certain events. The performance of the topic model was assessed by being compared with other alternative topic modeling techniques. The topic coherence was measured for the different techniques while changing the number of topics. Results showed that the pooling by author before performing LDA significantly improved the produced topic models.
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Arfa Iqbal,Emre Cevik,Omar Alagha,Ayhan Bozkurt 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
This study reports the removal of methylene blue dye (MB) from aqueous solutions by ultra-efficientbatch adsorption and membrane filtration using novel nitrogen-doped multilayer molybdenum carbideand molybdenum oxide nanosheets (NMoC@Mo). During batch adsorption studies, a complete MB dyeremoval (99.8%) was achieved against considerably high dye concentration (200 ppm) in a very shortduration (7 min) using 4 mg of adsorbent dose. The equilibrium studies confirmed that the adsorptiondata followed Langmuir adsorption isotherm with a maximum monolayer coverage adsorbent capacityof 204 mg g1. Reusability study of the NMoC@Mo nanosheets revealed that the adsorption (96%) /desorption(90%) efficiency of the adsorbent remained very high upto five consecutive cycles. the A costeffectivegravity driven membrane filtration studies were performed without applying any external pressure. Membranes (M-10, M-40, and M-60) containing three different loadings of NMoC@Mo (10 mg,40 mg, and 60 mg, respectively) into the polyvinyl difluoride (PVDF) doped solutions were exhibited amaximum dye removal of almost 85% achieved with M-40 membrane. Moreover, M-40 membrane exhibitedimproved hydrophilicity (contact angle: 79.94), water flux (53.35 L/m2-h), and improved antifoulingproperties. The results supported the immense potential and economic feasibility of NMoC@Mo in MBdye removal using both adsorption and membrane filtration processes.
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Seyda T. Gunday,Emre Cevik,Ismail Anil,Omar Alagha,Hussein Sabit,Ayhan Bozkurt 한국고분자학회 2020 Macromolecular Research Vol.28 No.12
The current research aimed to produce anhydrous gel organic electrolytes with superior performance for high-temperature supercapacitor applications. Within this scope, anhydrous electrolytes were designed by the termination of 1,4- butanediol diglycidyl ether (BDE) with 5-aminotetrazole (AT). The BDE(AT)2 was further doped with phosphoric acid (PA) and 1-Ethyl-3-methylimidazolium tetrafluoroborate (EMT, as an ionic liquid) at varied ratios. The structure of fabricated electrolytes was elucidated with various spectroscopic techniques, and thermal studies confirmed high thermal stabilities and low glass transition temperatures, suggesting that they could be used in a wide temperature range. Different supercapacitor systems, in combination with carbon-based electrodes and BDE(AT)2, BDE(AT)2-0.1EMT, and BDE(AT)2-PA-0.1EMT electrolytes, were constructed. The supercapacitor device in combination with BDE(AT)2-PA-0.1EMT electrolyte, showed the highest ionic conductivity value of 1.2×10-4 S cm-1. The electrode/electrolyte combination demonstrated a maximum specific capacitance (80.4 F g-1), the highest specific energy (2.91 Wh kg-1), and highly effective electrochemical reversibility (up to 2.250 cycles). The supercapacitor device illustrated a better performance at higher temperatures in terms of its specific capacitance value.
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Khazaei, Sedigheh,Izadi, Babak,Mirbahari, Seyed Ghasem,Madani, Seyed Hamid,Khosravi, Shohre Malek,Alagha, Mohsen Emami,Sajadimajd, Soraya Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12
Background: Cervical cancer is the second most common cancer among women in many populations. While the Pap smear is a well established screening test it suffers from both false-positive and false-negative results in diagnosis of cancers and precancerous states. In this study, immunocytochemistry of the P16 biomarker and HPV-PCR were compared for their diagnostic potential. Materials and methods: In the study, we obtained pairs of specimens from 45 women with cervical dysplasia. One sample was placed in a liquid-based solution, and processed for staining of sections with antibodies to P16. HPV-PCR was performed on the other and the results obtained were analyzed by T-test using SPSS v. 15. Results: Using HPV-PCR 71% of the samples were found to be infected with either HPV 16 or HPV 18, and the rate of infection did not have a statistically significant relationship with higher grades of dysplasia (p= 0.253). In contrast, with immunocytochemistry evaluation of P16, 64% of the specimens were positive, but the percentage of positive results significantly increased with higher grades of dysplasia (p= 0.0001). Conclusion: Employment of the P16 marker as an optional test might be preferable over HPV-PCR for cervical dysplasia in our geographical region.
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