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Amblyopia screening for first and second-grade children in Jordan

International Journal of Ophthalmology(English edition) 2022年第2期15卷 352-356页

作者： Khalil m.Al-Salem mohammad S.Saleem Ismat Ereifej hamzeh m.alrawashdeh Rayed Falah Hussein Obeidat Asma Ali Abdlmohdi Raeda Zaki Al-momani Layal mohammed Hammad Omar Ahmad al-Habahbeh Yaqeen m.Assassfeh Laith Ramzi Najib Al-Qsous Ashraf Hatim Adeeb Nasraween Tariq A.Al maaitah Deya'-Aldin muneer Hasan Aqeel Ibtehal Eyadeh Awad Alabdulrazzg Abdullah mahmoud mohammad murad Amany Jehad Faleh AL-Zurqan Enas Jamal mohammad Jaradat Slsabela Emad Suliman Aldhoon Ala'a majed Dmour Ahmad Talal Asassfeh Jeries Ayman Halaseh Abdel Aziz Ammar Daoud Waha Ayman Alkasasbeh Kholoud GH.matar Department of Ophthalmology and Visual Sciences Mutah UniversityAl-Karak 11183Jordan Royal medical Services Department of Ophthalmology Amman 11855Jordan Department of Ophthalmology and Visual Sciences Al-Sharif Eye CenterAmman 11194Jordan Jordanian menistrery of Health IrbidAmman 11855Jordan National Woman's Health Care Center(NWHCC) Amman 11855Jordan

AIm:To share the results of a national screening program for amblyopia in school children in the north of ***:This is a prospective national screening study for *** program rolls first and second-grade children(6 to 7 years old) in the north of *** eye examination included:best-corrected visual acuity,cover-uncover test,and cycloplegic *** visual acuity was tested using an ETDRS visual acuity chart without ***,children were tested with full cycloplegic refraction when the test criteria were *** amblyopia was defined as a best-corrected visual acuity difference of 2 or more *** comparison,bilateral amblyopia was defined as a best-corrected visual acuity of 20/40 or worse in the best ***:The prevalence of amblyopia for the total sample tested(n=17 203) was 2.78%(n=479).The most common cause of amblyopia was hypermetropia(64.45%),followed by previous ocular surgeries(15.1%),myopia(10.43%),strabismus(9.39%),and congenital cataract(0.63%).CONCLUSION:This is the first and only study,identifing modifiable risk factors in Jordanian children with *** their first couple of years of elementary education,many Jordanian children are affected by amblyopia and pass unnoticed.A more governmental effort is needed into screening programs to improve vision in the Jordanian population.

关键词： amblyopia screening Jordan community ophthalmology pediatric ophthalmology population-based study screening program

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Role of bevacizumab intraocular injection in the management of neovascular glaucoma

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International Journal of Ophthalmology(English edition) 2021年第6期14卷 855-859页

作者： Fawaz Al Sarireh hamzeh mohammad alrawashdeh Khalid Al Zubi Khalil Al Salem Department of Ophthalmology College of MedicineUniversity of MutahKarak 61710Jordan Department of Ophthalmology Sharif Eye CentersIrbid 410739Jordan

AIm:To assess the long-term effects of intraocular bevacizumab(Avastin)injections as an adjunctive drug to manage patients with neovascular glaucoma(NVG).mETHODS:A retrospective study was conducted consisting of 34 eyes with secondary NVG caused by proliferative diabetic retinopathy(n=25),ischemic central retinal vein occlusion(n=8),and retinal ischemia resulting from persistent detachment(n=1)were managed by intraocular injections of bevacizumab(1.25 mg/0.05 m L),in addition to other *** main outcome measure was the change in the degree of iris *** outcomes included intraocular pressure and the number of additional interventions or antiglaucoma medications administered after ***:All patients were followed-up for at least 12 *** the last follow-up,complete regression of rubeosis irides was detectable in 13(38.2%)eyes and incomplete regression in 21 eyes(61.8%).The mean intraocular pressure was 45.32±7.185 mm Hg at baseline and significantly decreased to 26.15±5.679 mm Hg at the last follow-up visit(P=0.000005).Patients received an average of 4.97 *** additional treatments,12 eyes(35%)received laser photocoagulation and 6 eyes(18%)underwent *** further treatment was needed in 16 eyes(47.1%).CONCLUSION:Intravitreal bevacizumab injection can have a favorable effect in controlling intraocular pressure and pain control in patients with NVG because it decreases the angiogenesis and helps to augment the results of conventional *** primary cause of retinal ischemia should be always targeted.

关键词： bevacizumab intraocular injection neovascular glaucoma rubeosis irides

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Designing Evolutionary Wavelet Neural Network for Estimating Foaming Slag Quality in Electric Arc Furnace Using Power Quality Indices

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CSEE Journal of Power and Energy Systems 2022年第4期8卷 1165-1174页

作者： hamzeh Rezvani Hamed Khodadadi Department of Electrical Engineering Khomeinishahr BranchIslamic Azad UniversityIsfahanIran

In the present study,a novel approach based on an evolutionary wavelet neural network(EWNN)is proposed to estimate the slag quality in an electric arc furnace(EAF)employing power quality *** the EWNN,an evolutionary method is applied to train the parameters for a combination of neural networks and wavelets.I For this purpose,all of the electrical parameters for six melting processes are measured with a power quality analyzer,attached to the secondary component of an EAF transformer at a Saba steel complex,to estimate the foaming slag *** results on various combinations of measured electrical parameters,applying the designed EWNN estimator,demonstrate that utilizing five leading indicators leads to the highest *** obtained 99%accuracy for estimating the foaming slag quality by EWNN compared to the other methods illustrates the proposed method's efficiency.

关键词： Electric arc furnace(EAF) evolutionary wavelet neural network(EWNN) foaming slag quality power quality analyzer

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A tri-level programming model for attack-resilient control of power grids

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Journal of modern Power Systems and Clean Energy 2018年第5期6卷 918-929页

作者： hamzeh DAVARIKIA masoud BARATI Department of Electrical Engineering Louisiana State University Department of Electrical and Computer Engineering University of Pittsburgh

The significance of modern power grids is acknowledged every time there is a major threat. This paper proposes the novel approaches to aid power system planner to improve power grid resilience by making appropriate hardening strategies against man-made attack or natural hazards. The vulnerability indices are introduced, which return the most vulnerable component in the system based on a tri-level defender-attacker-operator(DAO) interdiction problem which solves iteratively. The output of DAO is the set of hardening strategies that optimally allocated along the network to mitigate the impact of the worst-case damages. By repeating DAO problem based on the proposed algorithm, the various crafted attack is imposed on the system, and the defender's behavior demonstrates how an element is vulnerable to threats. The WSCC 9-bus, IEEE 24-bus, and IEEE 118-bus systems are employed to evaluate the model *** counter-intuitive results are proven by the proposed robust hardening strategy, which shows how the hardening strategy should be allocated to improve power network resilience against threats.

关键词： Cyber attack Defender Hardening Protection Resilience Vulnerability

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Potassium phthalimide:An efficient and green organocatalyst for the synthesis of 4-aryl-7-(arylmethylene)-3,4,6,7-tetrahydro-1Hcyclopenta[d]pyrimidin-2(5H)-ones/thiones under solvent-free conditions

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Chinese Chemical Letters 2014年第2期25卷 313-316页

作者： hamzeh Kiyani maryam Ghiasi School of Chemistry Damghan University

An efficient synthesis of Biginelli-type compounds using potassium phthalimide as a green, mild, and commercially available organocatalyst in a one-pot, multi-component cyclocondensation reaction of cyclopentanone, aldehydes, and urea/thiourea is reported. The present methodology is a green approach to access 4-aryl-7-（aryImethylene）-3,4,6,7-tetrahydro-1H-cyclopenta[d]pyrimidin-2（5H）-ones/thiones. It offers several merits such as simple operational procedures, no use of hazardous organic solvents, and cheap and environmentally friendly solid basic catalyst.

关键词： Organocatalyst Potassium phthalimide Biginelli reaction PyrimidinoneSolvent-free

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The Effect of Variable Stator on Performance of a Highly Loaded Tandem Axial Flow Compressor Stage

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Journal of Thermal Science 2016年第3期25卷 223-230页

作者： hamzeh Eshraghi masoud Boroomand Abolghasem m.Tousi mohammad Toude Fallah Ali mohammadi Department of Aerospace Engineering and Centre of excellence on computational aerospace engineering Amirkabir University of Technology Nanotechnology Research and Application Center Sabanci University

Increasing the aerodynamic load on compressor blades helps to obtain a higher pressure ratio in lower rotational speeds. Considering the high aerodynamic load effects and structural concerns in the design process, it is possible to obtain higher pressure ratios compared to conventional compressors. However, it must be noted that imposing higher aerodynamic loads results in higher loss coemcients and deteriorates the overall performance. To avoid the loss increase, the boundary layer quality must be studied carefully over the blade suction surface. Employment of advanced shaped airfoils （like CDAs）, slotted blades or other boundary layer control methods has helped the de- signers to use higher aerodynamic loads on compressor blades. Tandem cascade is a passive boundary layer control method, which is based on using the flow momentum to control the boundary layer on the suction surface and also to avoid the probable separation caused by higher aerodynamic loads. In fact, the front pressure side flow momentum helps to compensate the positive pressure gradient over the aft blade＇s suction side. Also, in compari- son to the single blade stators, tandem variable stators have more degrees of freedom, and this issue increases the possibility of finding enhanced conditions in the compressor off-design performance. In the current study, a 3D design procedure for an axial flow tandem compressor stage has been applied to design a highly loaded stage. Following, this design is numerically investigated using a CFD code and the stage characteristic map is reported. Also, the effect of various stator stagger angles on the compressor performance and especially on the compressor surge margin has been discussed. To validate the CFD method, another known compressor stage is presented and its performance is numerically investigated and the results are compared with available experimental results.

关键词： Compressor Stage Highly Loaded Performance Characteristic Tandem Variable Stator

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multi-layer spectral clustering approach to intentional islanding in bulk power systems

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Journal of modern Power Systems and Clean Energy 2019年第5期7卷 1044-1055页

作者： Faycal ZNIDI hamzeh DAVARIKIA Kamran IQBAL masoud BARATI Department of Systems Engineering University of Arkansas at Little RockLittle RockARUSA Department of Electrical and Computer Engineering Louisiana State UniversityBaton RougeLAUSA Department of Electrical and Computer Engineering University of PittsburghPittsburghPAUSA

Intentional controlled islanding(ICI)is a final resort for preventing a cascading failure and catastrophic power system *** paper proposes a controlled islanding algorithm that uses spectral clustering over multilayer graphs to find a suitable islanding *** multi-criteria objective function used in this controlled islanding algorithm involves the correlation coefficients between bus frequency components and minimum active and reactive power flow *** to the previous studies,the algorithm is applied in two *** the first stage,groups of coherent buses are identified with the help of modularity clustering using correlation coefficients between bus frequency *** the second stage,the ICI solution satisfying bus coherency with minimum active and reactive power flow disruptions is determined by grouping all nodes using spectral clustering on the multi-layer *** studies on the IEEE 39-bus test system demonstrate the effectiveness of the method in determining an islanding solution in real time while addressing the generator coherency problem.

关键词： Constrained spectral clustering Controlled islanding Bus coherency multi-layer graph Normalized spectral clustering

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Wellbore stability analysis to determine the safe mud weight window for sandstone layers

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Petroleum Exploration and Development 2019年第5期46卷 1031-1038页

作者： DARVISHPOUR Ayoub CHERAGHI SEIFABAD masoud WOOD David Anthony GHORBANI hamzeh Department of mining Engineering Isfahan University of TechnologyIsfahan ***Iran DWA Energy Limited LincolnLN59JPUnited Kingdom Southern Oil Fields National Iranian Oil CompanyTeheran ***Iran

The wellbore stability of a vertical well through the sandstone reservoir layers of the Asmari oil-bearing formation in south-west Iran is *** safe drilling-fluid density range for maintaining wellbore stability is determined and simulated using FLAC3 D software and a finite volume model established with drilled strata geomechanical *** initiation of plastic condition is used to determine the safe mud weight window(SmWW)in specific sandstone *** effects of rock strength parameters,major stresses around the wellbore and pore pressure on the SmWW are investigated for this *** analysis reveals that a reduction in cohesion and internal friction angle values leads to a significant narrowing of the *** the other hand,the reduction of pore pressure and the ratio between maximum and minimum horizontal stresses causes the SmWW to widen *** ability to readily quantify changes in SmWW indicates that the developed model is suitable as a well planning and monitoring tool.

关键词： wellbore stability wellbore geomechanical property safe mud weight window wellbore instability risk factors drilling stress simulation

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Heat Transfer and Energy Analysis of a Pusher Type Reheating Furnace Using Oxygen Enhanced Air for Combustion

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Journal of Iron and Steel Research International 2010年第4期17卷 12-17页

作者： hamzeh Jafar Karimi mohammad Hassan Saidi Science and Research Campus Islamic Azad University School of mechanical Engineering Sharif University of Technology

Oxy-fuel firing is more energy efficient and environmental friendly than conventional air-fuel firing and its application to reheating furnaces has begun since 1990s. A computational method was presented to predict the steady heat transfer to the billets and temperature distribution in a continuous pusher type reheating furnace in which combustion air was enhanced by oxygen. Radiation heat flux calculated from the radiation heat exchange within the furnace was modeled using the FVm considering the effects of furnace walls and billets. Energy consumption per ton of steel, production rate and thermal efficiency of furnace, and trend of NOx emission in various levels of oxygen enrichment were investigated by comparing with baseline furnace （21% of O2 in air）. The results showed that the best range of oxygen enrichments was between 21% and 45% by volume, as the higher slope of flame temperature and production increase occur in this range. The reduction of energy consumption can be obtained up to 18% per ton of steel for oxygen enrichment of 60 % by volume.

关键词： oxygen enhanced combustion reheating furnace energy consumption

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Numerical modeling of cavitation on spillway＇s flip bucket

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Frontiers of Structural and Civil Engineering 2016年第4期10卷 438-444页

作者： Abbas PARSAIE Sadegh DEHDAR-BEHBAHANI Amir hamzeh HAGHIABI Department of water Engineering Lorestan University Khorramabad Iran Hydro Structures Shahid Chamran University Ahvaz Iran

Numerical modeling of hydraulic phenomenon by computational fluid dynamic （CFD） approaches is one of the main parts in the high cost hydraulic structure studies. In this paper, using Flow 3D as CFD commercial tool, the cavitation phenomenon was assessed along spillway＇s flip bucket of the Balaroud dam. Performance of numerical modeling was compared to the physical model, which was constructed to this purpose. During numerical modeling, it was found that RNG turbulence model is a suitable performance for modeling the cavitation. Physical modeling shows that minimum cavitation index is about 0.85 and minimum cavitation index based on Flow 3D results is about 0.665, which was related to the flood discharge with return period of 10000 years. The main difference between numerical and physical modeling is related to the head of velocity, which is considered in physical modeling. Results of numerical simulation show that occurrence of cavitation based on cavitation index equal to 0.25 is not possible along the spillway.

关键词： cavitation Index numerical simulation spillway's flip Bucket CFD Balaroud Dam physical modeling

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