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Hyperspectral imaging and remote trace detection of cis-1,3,4,6-tetranitrooctahydroimidazo-[4,5 d]imidazole(BCHMX)compared with traditional explosives using laser induced fluorescence

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Defence Technology（防务技术） 2021年第5期17卷 1609-1616页

作者： hany S.Ayoub Ashraf F.El-Sherif ahmed Elbeih Department of Physics Faculty of ScienceCairo UniversityEgypt Laser Photonics Research Center Engineering Physics DepartmentMilitary Technical CollegeCairoEgypt Explosives Department Military Technical CollegeKobry ElkobbahCairoEgypt

cis-1,3,4,6-Tetranitrooctahydroimidazo-[4,5 d]imidazole(BCHMX)is an advanced energetic compound that expected to spread worldwide in the near ***,no approved remote detection methods were reported in current literature for this material,we performed hyper-spectral imaging and laser induced fluorescence(LIF)to a BCHMX sample under low laser fluence for determining the optimum laser wavelength used in any future BCHMX-LIF based remote detection *** this purpose,an experimental setup consisted of a sun spectrum lamp and hyper-spectral camera was built to illuminate and image white powder samples of BCHMX in comparison with the traditional explosives,HMX(1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane),RDX(1,3,5-trinitro-1,3,5-triazacyclohexane),PETN(2,2-Bis[(nitroxy)methyl]propane-1,3-diyldinitrate).The imaging reveals strong BCHMX sample absorption contrast among other samples at wavelength ranging from 400 to 410 *** light source was replaced by a 405 nm laser diode illuminator,a strong BCHMX sample LIF at the spectral range from 425 to 700 nm was observed under low laser fluence condition of 0.1 mJ/cm^(2).Finally,we demonstrated successfully the ability of the 405 nm LIF and the hyperspectral imaging technique to detect finger print traces of BCHMX on white cellulose fabric from a distance of 15 m and a detection limit of 1 mg/cm^(2).

关键词： Hyperspectral imaging Remote trace detection BCHMX Laser induced fluorescence

Expression levels ofβcatenin and galectin-3 in meningioma and their effect on brain invasion and recurrence:a tissue microarray study

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Cancer Biology & Medicine 2017年第3期14卷 319-326页

作者： Rehab Allah ahmed Abdelhadi M Shebl hany Onsy Habashy Department of Pathology Mansoura UniversityFaculty of MedicineMansoura DK 35516Egypt

Objective:Meningiomas are neoplasms that arise from the meninges of the central nervous system(CNS).They constitute about25.6%of CNS tumors diagnosed in *** morphological variants of meningiomas display aggressive behavior,leading to brain-invasive growth *** meningiomas are usually treated by complete surgical excision,the risk of postoperative recurrence ***,additional biomarkers for predicting aggressive behavior must be *** study aims to explore the clinical and biological relevance of the protein expression levels ofβ-catenin and galectine-3 in meningioma and to understand the pathobiology of this ***:This retrospective study was carried out on 153 cases of meningioma by using tissue microarrays and immunohistochemistry forβ-catenin and ***:Highβ-catenin expression was significantly associated with transitional and meningiotheliomatous meningiomas,low tumor grade,low recurrence rate,and low incidence of brain ***,high galectin-3 expression was associated with brain invasion,recurrence,high tumor grade,and tumor *** regression analysis indicated that among all variables included in the model,β-catenin and galactin-3 expression levels were significant predictors of tumor recurrence(P<0.001).Conclusions:Galectin-3 andβ-catenin are involved in meningioma recurrence but not in brain *** molecules could be important potential therapeutic targets and predictors for meningiomas.

关键词： Immunohistochemistry meningioma recurrence brain invasion galectin-3 and β-catenin

Fabrication of PMMA nanocomposite biomaterials reinforced by cellulose nanocrystals extracted from rice husk for dental applications

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Friction 2024年第12期12卷 2808-2825页

作者： ahmed FOULY Walid M.DAOUSH Hesham I.ELQADY hany S.ABDO Mechanical Engineering Department College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia The King Salman Center for Disability Research Riyadh 11421Saudi Arabia Department of Production Engineering and Mechanical Design Faculty of EngineeringMinia UniversityMinia 61519Egypt Department of Chemistry College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 11623Saudi Arabia Faculty of Technology and Education Helwan UniversityCairo 11281Egypt Faculty of Engineering Aswan UniversityAswan 81528Egypt Center of Excellence for Research in Engineering Materials(CEREM) King Saud UniversityRiyadh 11421Saudi Arabia Mechanical Design and Materials Department Faculty of Energy EngineeringAswan UniversityAswan 81521Egypt

The primary objective of global studies is to develop the properties and durability of polymers for various *** it comes to dental disability,denture base materials must have sufficient mechanical and tribological performance in order to withstand the forces experienced in the *** work aims to investigate the effects of the addition of low content of cellulose nanocrystals(CNC)on the mechanical and tribological performance of the polymethyl methacrylate(PMMA)*** weight percent of CNC(0,0.2,0.4,0.6,and 0.8 wt%)were added to the PMMA matrix followed by ball milling to evenly distribute the nanoparticles reinforced phase in the matrix *** findings emphasize the significant impact of CNC integration on the performance of PMMA *** increasing the content of the CNC nanoparticles,the mechanical properties of PMMA were *** addition,the tribological outcomes demonstrated a significant reduction in the friction coefficient besides an enhancement in the wear resistance as the weight percentage of nanoparticles *** surface of the worn samples was investigated by utilizing SEM to identify the wear mechanisms corresponding to the different *** addition,a finite elment model(FEM)was developed to ascertain the thickness of the worn layer and the generated stressed on the surfaces of the nanocomposite throughout the friction process.

关键词： polymethyl methacrylate nanocomposite cellulose nanocrystals denture materials rice husk polymethyl methacrylate(PMMA) wear resistance

Literature review of the outcome of and methods used to improve transperineal repair of rectocele

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World Journal of Gastrointestinal Surgery 2021年第9期13卷 1063-1078页

作者： Mohammad Fathy ahmed Hossam Elfallal Sameh hany Emile General Surgery Mansoura University Faculty of MedicineMansoura 35516Egypt

BACKGROUND Rectocele is commonly seen in parous women and sometimes associated with symptoms of obstructed defecation syndrome(ODS).AIM To assess the current literature in regard to the outcome of the classical transperineal repair(TPR)of rectocele and its technical *** An organized literature search for studies that assessed the outcome of TPR of rectocele was ***/Medline and Google Scholar were queried in the period of January 1991 through December *** main outcome measures were improvement in ODS symptoms,improvement in sexual functions and continence,changes in manometric parameters,and quality of *** After screening of 306 studies,24 articles were found eligible for inclusion to the *** studies(301 patients)assessed the classical TPR of *** median rate of postoperative improvement in ODS symptoms was 72.7%(range,45.8%-83.3%)and reduction in rectocele size ranged from 41.4%-95.0%.Modifications of the classical repair entailed omission of levatorplasty,addition of implant,concomitant lateral internal sphincterotomy,changing the direction of plication of rectovaginal septum,and site-specific *** The transperineal repair of rectocele is associated with satisfactory,yet variable,improvement in ODS symptoms with parallel increase in quality-of-life *** modifications of the classical TPR were *** modifications include omission of levatorplasty,insertion of implants,performing lateral sphincterotomy,changing the direction of classical plication,and site-specific *** indications for these modifications are not yet fully clear and need further prospective studies to help tailor the technique to rectocele patients.

关键词： Transperineal repair Rectocele Review Modifications Outcome

A coupled catalyst composed of CoFe_(2)O_(4) magnetic nanoparticle and[HMIM]Br-FeCl_(3) to intensify the oxidative desulfurization of FCC diesel

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Green Chemical Engineering 2021年第4期2卷 441-449页

作者： Yanlin Zhang Xinyu Zhang Guangren Yu Xiaochun Chen ahmed A.Abdeltawab hany El-Hamshary Beijing Key Laboratory of Membrane Science and Technology&College of Chemical Engineering Beijing University of Chemical TechnologyBeijing100029China Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Ionic liquids have been extensively studied as solvents or catalysts for oxidative desulfurization(ODS)of diesel fuel,but it is still a challenge to reduce the desulfurization time and *** this work,a new highly efficient desulfurization system composed of CoFe_(2)O_(4) magnetic nanoparticle,[HMIM]Br-FeCl_(3) and H_(2)O_(2) was developed for the ODS of FCC diesel *** desulfurization performances were investigated including desulfurization time,temperature,volume ratio of IL/oil,O/S molar ratio,dosage of CoFe_(2)O_(4),FeCl_(3) content in ILs,regeneration,and reuse of catalyst and *** to the coupled catalytic roles of CoFe_(2)O_(4) magnetic nanoparticle and[HMIM]Br-FeCl_(3),where Co2t and Fe3t interact with H_(2)O_(2) to produce ·OH radical that converts S-compounds into sulfone and sulfoxide compounds,such a desulfurization system is highly effective in removing S-compound in diesel *** S-content in FCC diesel fuel was reduced from the original 272.8 ppm to 0.5 ppm with 99.82%S-removal efficiency after one step within 8 minunder the optimal conditions of 25℃,8 min,V(IL/oil)=1:10,O/S=20,5 wt%CoFe_(2)O_(4) dosage and n([HMIM]Br)/n(FeCl_(3))=1:1;the desulfurization performance is much better in desulfurization time and steps than other desulfurization systems reported *** desulfurization system can be regenerated and reused without remarkable loss of desulfurization activity.A desulfurization mechanism was proposed.

关键词： CoFe_(2)O_(4)magnetic nanoparticle Ferric chloride ionic liquids Oxidative desulfurization

Modulation of splanchnic circulation:Role in perioperativemanagement of liver transplant patients

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World Journal of Gastroenterology 2016年第4期22卷 1582-1592页

作者： ahmed Mukhtar hany Dabbous Department of Anesthesia and Critical Care Cairo UniversityCairo 11562Egypt Department of Hepatology and Gastroenterology Ain Shams UniversityCairo 11566Egypt

Splanchnic circulation is the primary mechanism thatregulates volumes of circulating blood and systemic blood pressure in patients with cirrhosis accompanied by portal hypertension. Recently, interest has been expressed in modulating splanchnic circulation in patients with liver cirrhosis, because this capability might produce beneficial effects in cirrhotic patients undergoing a liver transplant. Pharmacologic modulation of splanchnic circulation by use of vasoconstrictors might minimize venous congestion, replenish central blood flow, and thus optimize management of blood volume during a liver transplant operation. Moreover, splanchnic modulation minimizes any high portal blood flow that may occur following liver resection and the subsequent liver transplant. This effect is significant, because high portal flow impairs liver regeneration, and thus adversely affects the postoperative recovery of a transplant patient. An increase in portal blood flow can be minimized by either surgical methods(e.g., splenic artery ligation, splenectomy or portocaval shunting) or administration of splanchnic vasoconstrictor drugs such as Vasopressin or terlipressin. Finally, modulation of splanchnic circulation can help maintain perioperative renal function. Splanchnic vasoconstrictors such as terlipressin may help protect against acute kidney injury in patients undergoing liver transplantation by reducing portal pressure and the severity of a hyperdynamic state. These effects are especially important in patients who receive a too small for size graft. Terlipressin selectively stimulates V1 receptors, and thus causes arteriolar vasoconstriction in the splanchnic region, with a consequent shift of blood from splanchnic to systemic circulation. As a result, terlipressin enhances renal perfusion by increasing both effective blood volume and mean arterial pressure.

关键词： Splanchnic circulation Vasopressin agonists Portal blood flow Liver transplant Perioperative renalfunction

Artificial Intelligence Based Clustering with Routing Protocol for Internet of Vehicles

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Computers, Materials & Continua 2022年第3期70卷 5835-5853页

作者： Manar ahmed Hamza Haya Mesfer Alshahrani Fahd NAl-Wesabi Mesfer Al Duhayyim Anwer Mustafa Hilal hany Mahgoub Department of Computer and Self Development Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAlkharjSaudi Arabia Department of Information Systems College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversitySaudi Arabia Department of Computer Science King Khalid UniversityMuhayel AseerSaudi Arabia Faculty of Computer and IT Sana’a UniversitySana’aYemen Department of Natural and Applied Sciences College of Community-AflajPrince Sattam bin Abdulaziz UniversitySaudi Arabia

With recent advances made in Internet of Vehicles(IoV)and Cloud Computing(CC),the Intelligent Transportation Systems(ITS)find it advantageous in terms of improvement in quality and interactivity of urban transportation service,mitigation of costs incurred,reduction in resource utilization,and improvement in traffic management *** trafficrelated problems in future smart cities can be sorted out with the incorporation of IoV in *** communication enables the collection and distribution of real-time essential data regarding road network *** this scenario,energy-efficient and reliable intercommunication routes are essential among vehicular nodes in sustainable urban *** this motivation,the current research article presents a new Artificial Intelligence-based Energy Efficient Clustering with Routing(AI-EECR)Protocol for IoV in urban *** proposed AI-EECR protocol operates under three stages namely,network initialization,Cluster Head(CH)selection,and routing *** presented AI-EECR protocol determines the CHs from vehicles with the help of Quantum Chemical Reaction Optimization(QCRO)*** a fitness function with the help of vehicle speed,trust level,and energy level of the *** order to make appropriate routing decisions,a set of relay nodeswas selected usingGroup Teaching Optimization Algorithm(GTOA).The performance of the presented AI-EECR model,in terms of energy efficiency,was validated against different aspects and a brief comparative analysis was *** experimental outcomes established that AI-EECR model outperformed the existing methods under different measures.

关键词： Vehicular communication internet of vehicles energy efficient smart transportation smart city urban computing

Fuel cell stack design and modelling with a double-stage boost converter coupled to a single-phase inverter

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Clean Energy 2024年第1期8卷 188-196页

作者： Basem E.Elnagi ahmed M.Ismaiel hany S.E.Mansour M.N.Abd-Alwahab Electrical Engineering Department Faculty of EngineeringSuez Canal UniversityIsmailia 41522Egypt

A comprehensive proton-exchange membrane fuel cell stack model was developed and integrated with a two-stage DC/DC boost *** was directly coupled to a single-phase(two levels-four pulses)inverter without a *** pulse-width modu-lation signal was used to independently regulate every converter *** converter was modelled using a MATLAB®/Simulink®environment and an appropriate voltage control *** analysis features of the suggested circuit were created and,through established experiments,the simulation results were verified.A single-phase(two levels-four pulses)inverter control circuit was tested and it produced a pure sinusoidal waveform with voltage *** matches the voltage of the network in terms of amplitude and frequency.A sinusoidal pulse-width modulation approach was performed using a single-phase(two levels-four pulses)pulse-width modulation *** results demonstrated an enhancement in the standard of the output wave and tuned the dead time with a reduction of 63μs compared with 180μs in conventional techniques.

关键词： PEM fuel cell pulse-width modulation single-phase inverter and double-stage DC/DC boost converter

Accelerated versus standard corneal cross linking in the treatment of ectasia post refractive surgery and penetrating keratoplasty: a medium term randomized trial

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International Journal of Ophthalmology(English edition) 2019年第11期12卷 1714-1719页

作者： hany A.Khairy Moataz F.Elsawy Khaled Said-ahmed Marwa A.Zaki Sameh S Mandour Department of Ophthalmology Menoufia University Hospitals

AIM: To compare the clinical outcomes of the standard corneal cross linking(CXL) and the accelerated CXL in patients with progressive corneal ectasia post refractive surgery and penetrating ***: Totally 120 eyes of 83 patients scheduled to receive either standard CXL(3 m W/cm^2 for a period of 30 min) or accelerated CXL(18 m W/cm2 for a period of 5 min). The main outcomes for comparison were the change in: maximum-K reading(K-max), manifest refractive spherical equivalent(SE), central corneal thickness(CCT), and the best corrected distance visual acuity(CDVA).RESULTS: One hundred and eleven eyes completed the study. The main outcome measurement was the K-max reading. Both group showed significant improvement in the value postoperatively at 6 and 12 mo. The mean change in the standard group was 1.21±0.11 D and in the accelerated group was 0.90±0.05 D at the end of 12 mo postoperatively, with no statistically significant difference between the 2 groups. Similarly, CDVA improved significantly from their preoperative value in the standard group by 2.98±0.11 letters, and in the accelerated group by 2.20±0.06 letters, with no statistically significant difference between the two groups. Both of the SE, and CCT showed no statistically significant difference at the end of follow up period in each ***: Both standard CXL and accelerated CXL are safe and effective treatment in halting ectasia after corneal refractive surgery. The accelerated CXL results are comparable to the standard CXL with short time exposure of the cornea to ultraviolet irradiation, leading to reduced operation time, reduced operative ocular discomfort, and corneal haze.

关键词： corneal cross linking accelerated refractivesurgery penetrating keratoplasty corneal ectasia