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Solar Thermochemical Reactions IV: Unusual Reaction of Nitrones with Acetonitrile Derivatives Induced by Solar Thermal Energy

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Green and Sustainable Chemistry 2011年第4期1卷 176-181页

作者： ramadan ahmed mekheimer Khadijah Mohamed Al-Zaydi Asma Al-Shamary Kamal Usef Sadek 不详

The behaviour of cyanothioacetamide 1 and the acetonitrile derivatives 6 and 10, respectively, towards the nitrones 2a-i induced by free solar thermal energy is reported. Structures and reaction mechanisms are also di... 详细信息

关键词： Nitrones Cyanothioacetamide 2-(Hetaryl)Acetonitrile Derivatives Synthesis Solar Thermal Energy.

Cerium (IV) Ammonium Nitrate (CAN) Mediated Reactions IV. A Highly Efficient Synthesis of N,N’-Diarylsubstituted Formamidines in Water at Ambient Temperature

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Green and Sustainable Chemistry 2011年第3期1卷 92-97页

作者： Kamal Usef Sadek Abdulaziz Alnajjar ramadan ahmed mekheimer Nasr Kamel Mohamed Haney A. Mohamed 不详

A green, simple and highly efficient synthesis of N,N-diarylsubstituted formamidines has been developed employs reaction of triethylorthoformate (TEO) with aromatic amines catalyzed by cerium (IV) ammonium nitrate (CAN) in water at ambient temperature. This method offers the advantages of proceeding under environmentally friendly technique with high yields and simplicity either in conducting the reaction or handling the products.

关键词： CAN Triethylorthoformate Aromatic Amines Water Ambient Temperature

Garlic Clove Catalyzed Biginelli Reaction in Water at Ambient Temperature

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Green and Sustainable Chemistry 2013年第4期3卷 141-145页

作者： Hishame Abd-Elnabi Afaf Mohamed Abdel Hameed ramadan ahmed mekheimer Reham R. Awed Kamal Usef Sadek Department of Chemistry Faculty of Science El-Minia University El-Minia Egypt Department of Chemistry Faculty of Science El-Minia University El-Minia Egypt Department of Chemistry Faculty of Science for Girls King Abdulaziz University Jeddah KSA

A simple, green and highly efficient procedure for the Biginelli condensation reaction of aldehydes, β-ketoesters, urea or thiourea catalyzed by crushed garlic clove at ambient temperature is reported.

关键词： Garlic Glove Biocatalysis Water Biginelli Reaction

Diagnostic accuracy of ePOS score in predicting DNR labeling after ICU admission:A prospective observational study(ePOS-DNR)

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Journal of Intensive Medicine 2024年第2期4卷 216-221页

作者： Omar E.ramadan ahmed F.Mady Mohammed A.Al-Odat ahmed N.Balshi ahmed W.Aletreby Taisy J.Stephen Sheena R.Diolaso Jennifer Q.Gano Waleed Th.Aletreby Department of Critical Care King Saud Medical CityRiyadhSaudi Arabia Anesthesia Department Faculty of MedicineAin Shams UniversityCairoEgypt Anesthesia Department Faculty of MedicineTanta UniversityTantaEgypt Faculty of Medicine Alexandria UniversityAlexandriaEgypt Nursing Department King Saud Medical CityRiyadhSaudi Arabia

Background Resuscitation can sometimes be futile and making a do-not-resuscitate(DNR)decision is in the best interest of the *** electronic poor outcome screening(ePOS)score was developed to predict 6-month poor outcomes of critically ill *** explored the diagnostic accuracy of the ePOS score in predicting DNR decisions in the intensive care unit(ICU).Methods This study was conducted at the ICU of a tertiary referral hospital in Saudi Arabia between March and May ***,we calculated ePOS scores for all eligible consecutive admissions after 48 h in the ICU and recorded the DNR *** ability of the score to predict DNR was explored using logistic ***'s ideal cut-off value was calculated using the DeLong method,and different diagnostic accuracy measures were generated with corresponding 95%confidence intervals(CIs).Results We enrolled 857 patients,125 received a DNR order and 732 did *** average ePOS score of DNR and non-DNR patients was 28.2±10.7 and 15.2±9.7,*** score,as a predictor of DNR order,had an area under receiver operator characteristic(AUROC)curve of 81.8%(95%CI:79.0 to 84.3,P17 was associated with a sensitivity of 87.2(95%CI:80.0 to 92.5,P17 may help guide clinical decisions to withhold or commence resuscitative measures.

关键词： Do-not-resuscitate(DNR) Resuscitation Intensive care unit(ICU) Diagnostic accuracy Sensitivity Specificity

Friction and wear of sand-contaminated lubricated sliding

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Friction 2018年第4期6卷 457-463页

作者： Mohamed ahmed ramadan Faculty of Engineering at Helwan Helwan University

This paper reports a test investigation of friction and wear responses from sand contaminated lubricated sliding. The influence of sand contaminants on wear and friction is characterized. Analyses are completed utilizing segments of piston ring sliding against the cylinder liner. Paraffin oil, with and without sand contaminants, is utilized. The effects of the concentration and particle size of sand are examined. Based on the observations in the present work, we found that friction and wear increase with sand concentration in the lube. Solid proposals ought to be considered, in order to enlighten the general population on the importance of changing a car engine's oil filter regularly.

关键词： sand contamination lubrication oil abrasive wear lubricated sliding

Could ketamine be the answer to treating treatment-resistant major depressive disorder?

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General Psychiatry 2020年第5期33卷 296-300页

作者： Abdullah Mohammed ramadan Islam ahmed Mansour Psychiatry Mansoura University Faculty of MedicineMansouraEgypt

Major depressive disorder(MDD)is a common,serious,debilitating condition affecting 350 million people worldwide,which remains to be unsatisfactorily treated with 53%of patients still complaining of symptoms after completing their courses with the correct ***,which was approved by the Food and Drug Administration in 2019,is a potential treatment option for those recalcitrant *** mechanism of ketamine is not fully understood,but as type it is classified as an N-methyl-D-aspartate(NMDA)glutamate receptor antagonist,and can be given intravenously,intranasally and *** is used to treat treatment-resistant depression,depression associated with suicidal ideation,mood and anxiety disorders and depressions associated with either type of bipolar *** ketamine is considered relatively safe,several side effects have been reported with the major ones being psychiatric in the form of worsening mood,anxiety and agitation;psychotomimetic in the form of dissociation,perceptual disturbance and abnormal sensations;cardiovascular in the form of increased blood pressure and increased heart rate;and neurological in the form of headache and *** is still not approved worldwide for usage in patients with treatment-resistant MDD,but if it is approved sometime in the future with relatively fewer side effects,it is expected to significantly save millions of dollars spent yearly on patients with treatment-resistant depression and that will lift this major burden off the shoulders of healthcare *** study was designed to measure the effects of ketamine,an NMDA receptor antagonist,on patients with treatment-resistant MDD and to analyse the concept that makes it different and relatively safer than other major antidepressants like selective serotonin reuptake inhibitors,monoamine oxidase inhibitors and TCAs(tricyclic antidepressants).

关键词： ketamine dosage sensation

Dissolved gas analysis and dissipation factor measurement of mineral oil-based nanofluids under thermal and electrical faults

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High Voltage 2023年第3期8卷 455-465页

作者： ahmed Maher Diaa-Eldin A.Mansour Khaled Helal ramadan A.A.Abd El Aal Department of Electrical Engineering Faculty of EngineeringPort-Said UniversityPort-SaidEgypt Department of Electrical Power Engineering Faculty of EngineeringEgypt-Japan University of Science and Technology(E-JUST)New Borg El-Arab CityAlexandriaEgypt Department of Electrical Power and Machines Engineering Faculty of EngineeringTanta UniversityTantaEgypt

Mineral oil is the most frequent insulating liquid used in oil-immersed transformers for electrical insulation and heat ***,oil-based nanofluids are becoming more popular in scientific research as they have proved to have better dielectric and thermal *** applying these nanofluids into actual transformers,they would be exposed to thermal and electrical ***,The aim of the authors is to investigate the generation pattern of dissolved gases in nanofluids under thermal and electrical faults and to assess the applicability of traditional Dissolved Gas Analysis(DGA)techniques if oil-based nanofluids are used in ***-based nanofluid samples were prepared using a magnetic stirrer and an ultrasonic homogeniser and then subjected to simulated thermal and electrical faults in the laboratory using properly sealed test *** types of metal oxides,Silicon dioxide,Titanium dioxide,and Aluminium oxide nanoparticles,have been used to prepare nanofluids with 0.02 g/L and 0.04 g/L *** gases released and dissolved into oil due to the simulated faults were analysed and compared to traditional mineral oil as a *** dielectric dissipation factor was obtained and analysed for all *** to the findings,the presence and concentration of nanoparticles were shown to influence the amount of gases *** a result,this research is crucial in guaranteeing that traditional DGA techniques can be employed in transformers that use oil-based nanofluids.

关键词： electrical thermal dioxide

Are climate change and mental health correlated?

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General Psychiatry 2021年第6期34卷 49-57页

作者： Abdullah Mohammed Hassan ramadan ahmed G Ataallah Department of Psychiatry Mansoura University Faculty of MedicineMansouraEgypt

Climate change is one of the biggest challenges of our time and is likely to affect human beings in substantial ***,researchers started paying more attention to the changes in climate and their subsequent impact on the social,environmental and economic determinants of health,and the role they play in causing or exacerbating mental health *** effects of climate change-related events on mental well-being could be classified into direct and indirect *** direct effects of climate change mostly occur after acute weather events and include post-traumatic stress disorder,anxiety,substance abuse disorder,depression and even suicidal *** indirect effects include economic losses,displacement and forced migration,competition over scarce resources and collective *** risk factors for developing those mental health issues include young age,female gender,low socioeconomic status,loss or injury of a loved one,being a member of immigrant groups or indigenous people,pre-existing mental illness and inadequate social ***,in some individuals,especially those undisturbed by any directly observable effects of climate change,abstract awareness and acknowledgement of the ongoing climate crisis can induce negative emotions that can be intense enough to cause mental health *** strategies should be provided to the affected communities to protect their mental health from collapse in the face of climate *** of the mental health impacts of climate change should be raised,especially in the high-risk *** and global attention to the climate crisis and its detrimental effects on mental health are *** paper was written with the aim of trying to understand the currently,scientifically proven impact of climate change-related disasters on mental health and understanding the different methods of solving the problem at the corporate level,by trying to decrease greenhouse gas emissions to zero,and at the i

关键词： mostly collective likely

ANFIS-based Sensor Fusion System of Sit-to-stand for Elderly People Assistive Device Protocols

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International Journal of Automation and computing 2013年第5期10卷 405-413页

作者： Omar Salah ahmed A.ramadan Salvatore Sessa ahmed Abo Ismail Makasatsu Fujie Atsuo Takanishi Egypt-Japan University of Science and Technology New Borg-El-Arab City Faculty of Engineering Tanta University Faculty of Science and Engineering Waseda University

This paper describes the analysis and design of an assistive device for elderly people under development at the EgyptJapan University of Science and Technology（E-JUST） named E-JUST assistive device（EJAD）.Several experiments were carried out using a motion capture system（VICON） and inertial sensors to identify the human posture during the sit-to-stand *** EJAD uses only two inertial measurement units（IMUs） fused through an adaptive neuro-fuzzy inference systems（ANFIS） algorithm to imitate the real motion of the *** EJAD consists of two main parts,a robot arm and an active *** robot arm is a 2-degree-of-freedom（2-DOF） planar *** addition,a back support with a passive joint is used to support the patient s *** IMUs on the leg and trunk of the patient are used to compensate for and adapt to the EJAD system motion depending on the obtained patient *** ANFIS algorithm is used to train the fuzzy system that converts the IMUs signals to the right posture of the patient.A control scheme is proposed to control the system motion based on practical measurements taken from the experiments.A computer simulation showed a relatively good performance of the EJAD in assisting the patient.

关键词： Adaptive neuro-fuzzy inference systems(ANFIS) sensor fusion assistive technologies sit-to-stand motion analysis inertial measurement units