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Computers, Materials & Continua 2023年第6期75卷 5433-5449页

作者： haya alaskar Department of Computer Sciences College of Computer Engineering and SciencesPrince Sattam bin Abdulaziz UniversityAl KharjSaudi Arabia

Automatic deception recognition has received considerable atten-tion from the machine learning community due to recent research on its vast application to social media,interviews,law enforcement,and the *** analysis-based techniques for automated deception detection have received increasing *** study develops a new self-adaptive population-based firefly algorithm with a deep learning-enabled automated deception detection(SAPFF-DLADD)model for analyzing facial ***-tially,the input video is separated into a set of video ***,the SAPFF-DLADD model applies the MobileNet-based feature extractor to produce a useful set of *** long short-term memory(LSTM)model is exploited for deception detection and *** the final stage,the SAPFF technique is applied to optimally alter the hyperparameter values of the LSTM model,showing the novelty of the *** experimental validation of the SAPFF-DLADD model is tested using the Miami University Deception Detection Database(MU3D),a database comprised of two classes,namely,truth and *** extensive comparative analysis reported a better performance of the SAPFF-DLADD model compared to recent approaches,with a higher accuracy of 99%.

关键词： Deception detection facial cues deep learning computer vision hyperparameter tuning

Certification of a Multicomponent Reference Material from Natural Gas Mixture by Gravimetry and Dual GC-FID/TCD System

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Green and Sustainable Chemistry 2023年第4期13卷 269-290页

作者： Adel Bassuoni Shehata Abdulrahman Rashed alaskar Najjy Hamad AlYami Abdullah Suleiman AlOwaysi Chemistry Department National Measurement and Calibration Center (NMCC) Saudi Standards Metrology and Quality Organization (SASO) Riyadh Kingdom of Saudi Arabia

Natural gas (NG) is one of the most important sources of energy for industrial and domestic consumption in the present era because it is cheap and free from sulfur impurities. Therefore, accurate and precise measurement of its composition is of fundamental importance for trade reasons. To improve the quality of NG gas measurements, certified reference materials (CRMs) should be used for calibration of measuring equipment in order to ensure the traceability of the measurement results to the SI units. For the traceability purpose, a multicomponent natural gas mixture was prepared gravimetrically as a reference material according to ISO 6142 from pure helium, hydrogen, n-pentane, i-pentane, n-butane, i-butane, propane, ethane, hexane, methane and nitrogen. The preparation was done in two dilution steps in 5 L aluminum cylinders. The calculated mole fractions and associated uncertainties of natural gas components were verified by a dual GC-FID/TCD system in accordance with ISO 6143 calibrated by a series of primary gas mixtures (CRMs) produced by an NMI. The results obtained by gravimetry and by GC measurements have been checked for compatibility as required by ISO 6142 and were found in very good agreement. Details of the preparation and calculation of the mole fractions and uncertainties of all gas components are explained in this article.

关键词： Pure Gases Gravimetry Reference Material Stability GC Verification Uncertainty

Graft vs host disease impacts overall survival post allogeneic hematopoietic stem cell transplantation for acute lymphoblastic leukemia/lymphoma

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World Journal of Transplantation 2018年第7期8卷 252-261页

作者： Moussab Damlaj Mohammad Snnallah Ayman Alhejazi Samer Ghazi Bader Alahmari Ahmed alaskar Mohsen Al-Zahrani Division of Hematology and HCT Department of Oncology King Abdulaziz Medical City King Abdullah International Medical Research Center King Saud bin Abdulaziz University for Health Sciences

AIM To examine the outcome and prognostic factors for high risk patients with acute lymphoblastic leukemia/lymphoma(ALL/LBL) who underwent allogeneic hematopoietic stem cell transplantation(HCT) at our center during the period of2010-2017 METHODS After due institutional review board approval, patients with high risk ALL/LBL post HCT were identified and included. All records were retrospectively collected. Time to event analysis was calculated from the date of HCT until event of interest or last follow up with Kaplan-Meir means. Cox regression model was used for multivariable analysis *** A total of 69 patients were enrolled and examined with a median age of 21(14-61). After a median follow up of 15 mo(2-87.3), the 2-year cumulative incidence of relapse, cumulative incidence of non-relapse mortality, progression free survival and overall survival(OS) were 34.1%, 10.9%, 54.9% and 62.8%,respectively. In a multivariable analysis for OS; acute graft vs host disease(GVHD) and chronic GVHD were significant with corresponding hazard ratio 4.9(1.99-12; P = 0.0007) and 0.29(0.1-0.67; P = 0.0044), *** Allogeneic-HCT for high risk ALL/LBL resulted in promising remissions particularly for patients with cGVHD.

关键词： Acute lymphoblastic leukemia Allogeneic hematopoietic stem cell transplant Lymphoblastic lymphoma Complete remission

Development of a Certified Reference Material from Caffeine Solution for Assuring the Quality of Food and Drug Measurements

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Case Reports in Clinical Medicine 2023年第3期12卷 216-236页

作者： Adel B. Shehata Abdulrahman R. alaskar Mohammed A. AlRasheed Abdulrahman M. AlZahrany Fahd A. AlKharraa Sowailem A. AlSowailem Chemistry Department/National Measurement and Calibration Center (NMCC) Saudi Standards Metrology and Quality Organization (SASO) Riyadh Kingdom of Saudi Arabia

Caffeine intake by pregnant women, adults and children can be harmful to the health of all particularly fetuses if the intake exceeds the permissible limits. Therefore, it is of fundamental importance to measure its concentration accurately using certified reference materials (CRMs). In the literature, no scientific details are published about the certification of caffeine standard solutions, and therefore, the present article covers this gap. A batch of caffeine solution was prepared in concentration of 1000 mg/kg and bottled. Homogeneity and stability of the candidate reference material were assessed by HPLC-UV and the results showed that the material is homogenous and stable enough. Characterization of the caffeine reference material was performed by HPLC-UV, LC-MS/MS and UV-VIS-NIR spectrophotometer in three different days and the characterization uncertainty was estimated in accordance with the requirements of ISO GUM. The certified value (999.86 ± 8.57 mg/kg) was derived as a weighted mean from the gravimetry and the three characterization methods and the certified uncertainty was calculated according to ISO Guide 35. The produced CRM is of strong interest to the food and drug analytical laboratories for the validity and credibility of their caffeine measurement results.

关键词： Caffeine Reference Material Homogeneity Stability Characterization Certification

Validation of a Method for the Measurement of Caffeine in Water by HPLC-UV

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Green and Sustainable Chemistry 2023年第4期13卷 291-302页

作者： Adel B. Shehata Abdulrahman R. alaskar Mohammed A. AlRasheed Abdulrahman M. AlZahrany Fahd A. AlKharraa Sowailem A. AlSowailem Chemistry Department National Measurement and Calibration Center (NMCC) Saudi Standards Metrology and Quality Organization (SASO) Riyadh Kingdom of Saudi Arabia

For the production of a reference material from caffeine solution, one of the methods of characterization was HPLC-UV since caffeine is very sensitive to the UV. In this work, a batch solution of caffeine in water reference material of 1000 mg/kg has been gravimetrically prepared using a calibrated analytical balance. A sample of this solution was diluted to 25 mg/kg for measurement by HPLC-UV in the range 10 - 50 mg/kg. The chromatographic separation was carried out by C-18 column and a mobile phase assembled of 75% water and 25% methanol (v:v). The detection was made by the UV detector at 275 nm. The validation of this analytical method was carried out in accordance with requirements of the EURACHEM and ICH guidelines. The selectivity, linearity, accuracy, precision and trueness (recovery and bias) of the method were studied. The validation results proved that the method is fit-for-purpose of measuring the caffeine concentration in water in the range 10 - 50 mg/kg using HPLC-UV.

关键词： HPLC-UV Caffeine Selectivity Linearity Precision Accuracy

Certification of a Multicomponent Reference Material from Natural Gas Mixture by Gravimetry and Dual GC-FID/TCD System

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Validation of a Method for the Measurement of Caffeine in Water by HPLC-UV

Green and Sustainable Chemistry（绿色与可持续化学） 2023年第4期

作者： Adel Bassuoni Shehata Abdulrahman Rashed alaskar Najjy Hamad AlYami Abdullah Suleiman AlOwaysi

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Development of a Certified Reference Material from Caffeine Solution for Assuring the Quality of Food and Drug Measurements

Green and Sustainable Chemistry（绿色与可持续化学） 2023年第4期

作者： Adel B.Shehata Abdulrahman R.alaskar Mohammed A.AlRasheed Abdulrahman M.AlZahrany Fahd A.AlKharraa Sowailem A.AlSowailem

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