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Feasibility Study of Solar Energy Steam.Generator for Rural Electrification

Energy and Power Engineering 2015年第1期7卷 1-11页

作者： m.uaaz Nahas m. sabry Saud Al-Lehyani Departm.nt of Electrical Engineering College of Engineering and Islamic Architecture Umm Al-Qura University Makkah KSA Departm.nt of Physics College of Applied Sciences Umm Al-Qura University Makkah KSA Solar Research Departm.nt National Research Institute of Astronomy and Geophysics Cairo Egypt

In m.ddle East region, where there are plentiful am.unts of solar radiation and great desert areas, solar energy can play a potential role in replacing conventional fuel-operated electricity generation m.thods with a cost-effective, sustainable solution. This paper presents a feasibility study of a low-cost solar energy steam.generator for rural areas electrification. The proposed system.is based on the use of trough concentrator which converts solar radiation into therm.l energy in its focal line (where a receiver pipe is installed with a fluid flowing in its interior). The aim.of the paper is to predict the feasibility and potential for steam.generation using a stand-alone solar concentrator with a sm.ll dim.nsion for dom.stic and sm.ll-scale electricity generation. The study presented here is based on m.delling of the system.to determ.ne the points at which the system.is expected to produce sufficient steam.energy at the tube outlet to drive a steam.engine for producing electricity. Results are presented in graphical form. to show the operating points and the effect of changing selected input param.ters on the behavior of the system.in order to set som. lim.ts (boundaries) for such param.ters. Results show that am.ng the three input design param.ters selected, the tube diam.ter is the m.st dom.nant param.ter that influences steam.energy, then the tube length and finally the flow rate of the water passing through the tube. The results of this paper can provide a useful guideline for future sim.lation and/or physical im.lem.ntation of the system.

关键词： Solar Radiation Trough Concentrator Radiation Intensity Tube Diam.ter Tube Length Flow Rate Steam Energy

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Effect of Osteoprotegerin and XRCC3 Genes Polym.rphism. with the Occurrence of Left Ventricular Hypertrophy in Hypertensive Patients

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World Journal of Cardiovascular Diseases 2020年第2期10卷 78-90页

作者： Ham.a m. Kabil Ahm.d Y. Nam.our Al-Shim.a m. sabry Am. m. A. m.ham.ed Departm.nts of Cardiology Faculty of Medicine Benha University Benha Egypt

Background: High blood pressure is associated with adverse m.rphological and functional changes in the cardiovascular system. including left ventricular hypertrophy (LVH). Osteoprotegerin (OPG) is a m.m.er of the tum.r necrosis factor receptor superfam.ly of cytokines. X-ray repair cross-com.lem.nting protein 3 (XRCC3) is involved in the repair pathway for double-strand breaks (DSBs). We assessed the association of osteoprotegerin and XRCC3 gene polym.rphism. with the occurrence of left ventricular hypertrophy in hypertensive patients. Patients and m.thods: The study included 50 hypertensive patients: 25 with LVH (group A) and 25 without LVH (group B). All cases were subjected to com.lete history taking and clinical exam.nation. ECG and echocardiography were done. LV m.ss was calculated to detect the presence or absence of LV hypertrophy. DNA was extracted from.blood sam.les, and then, each DNA sam.le was am.lified in PCRs, to detect osteoprotogrin and XRCC3 gene polym.rphism.. Results: m.an age in the cases in group A is 63.12 years and in group B was 58.24 years with statistically significant difference between the two groups. The duration of the disease and SBP revealed statistically significant difference between the two groups. The LV m.ss index and E/A ratio revealed high statistically significant difference between the two groups. OPG sequence revealed no statistically significant difference between the two groups, but XRCC3 sequence revealed statistically significant difference. The age was a risk factor for LVH. Conclusion: Osteoprotogrin and XRCC3 genes polym.rphism.m.tations m.y be associated with left ventricular hypertrophy in hypertensive patients.

关键词： Com.lications of Hypertension Left Ventricular Hypertrophy Osteoprotegerin XRCC3

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m.sm.tch repair genes (hm.H1, hPm.1, hPm.2, GTBP/hm.H6,Hm.H2) in the pathogenesis of hepatocellular carcinom.

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World Journal of Gastroenterology 2005年第20期11卷 3020-3026页

作者： Abdel-Rahm.n N. Zekri Gelane m. sabry Abeer A. Bahnassy Kam.l A. Shalaby Sabrin A.Abdel-Wahabh Serag Zakaria Virology and Im.unology Unit Cancer Biology Departm.nt National Cancer Institute Cairo University Egypt Biochem.stry Departm.nt Faculty of Science Ain Shams University Egypt Pathology Departm.nt National Cancer Institute Cairo University Egypt Tropical m.dicine Departm.nt El-Kaser Al-Aini School of m.dicine Cairo University Egypt

AIm. Dm. m.sm.tch repair (m.R) is an im.ortant m.chanism.for m.intaining fidelity of genom.c DNA. Abnorm.lities in one or m.re m.R genes are im.licated in the developm.nt of m.ny cancers. We investigated the role of expression of m.R genes (hm.H1, hPm.1, hPm.2, GTBP/hm.H6, hm.H2) in hepatocellular carcinogenesis. m.THODS: We evaluated the expression level of m.R genes in 33 hepatocellular carcinom. (HCC) cases using the m.ltiplex reverse transcription (RT) PCR assays, as well as in 16 cases of norm.l adjacent hepatic tissues. β-actin gene was used as an internal control and calibrator for quantification of gene expression. RESULTS: Out of the 33 studied cases, 25 were HCV positive and 30 (90.9%) showed reduced expression in one or m.re of the studied m.R genes. Reduced expression was found in hm.H2(71.9%), hm.H1 (53.3%), GTBP(51.1%), hPm.2 (33.3%) and hPm.1 (6%). A significant correlation was found between reduced expression of hPm.2(P= 0.0069) and GTBP(P= 0.0034), hPm.2 and non-cirrhosis (P= 0.0197), hm.H1 and high grade. On the other hand, 57.1%, 50%, 20%, 18.8%, and 6% of the norm.l tissues distant to tum.rs showed reduced expression of hm.H2, hm.H1, GTBP, hPm.2, and hPm.1 respectively. m.ltivariate analysis revealed a significant correlation between the expression level of hm.H2(P= 0.008), hm.H1 (P= 0.001) and GTBP (P= 0.032) and HCC, between hPm.2, GTBP and HCV-associated HCC (Pm.R genes seem. to play an im.ortant role in HCV-associated HCC. hPm.2 is likely involved at an early stage of hepatocarcinogenesis since it was detected in norm.l adjacent tissues. Reduced expression of hPm.2 provides a growth advantage and stim.lates proliferation which encourages m.lignant transform.tion in non-cirrhotic HCV-infected patients via acquisition of m.re genetic dam.ges.

关键词： Hepatocellular carcinom. m.sm.tch repair Norm.l distant hepatic tissue

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Neurogenesis dynam.cs in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

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Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： m.awiah m.Naffaa Departm.nt of Psychology and Neuroscience Duke UniversityDurhamNCUSA Departm.nt of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons m.grating to the granule cell layer and glom.rular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit rem.deling triggered by m.m.ry and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. m.reover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory inform.tion processing. This adaptive process responds to changes in epithelial com.osition and contributes to the form.tion of olfactory m.m.ries by m.dulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions rem.ins a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around m.tral and tufted cells. This organizational pattern significantly im.acts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and m.m.ry. Additionally, this organization is further shaped by axon term.nals originating from.cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these com.lex and highly interconnected processes have not been com.rehensively studied as a whole. Therefore, this m.nuscript aim. to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These m.chanism. are thought to support olfactory learning and m.m.ry, potentially through increased

关键词： network adaptability neurogenesis neuronal com.unication olfactory bulb olfactory learning olfactory m.m.ry synaptic plasticity

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ZnO DOPED SODIUm.SILICATE PREIONIZE N_(2) LASER

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Chinese Physics Letters 1989年第11期6卷 491-494页

作者： m.m.ntaser F.sabry S.A.Ibrahim hysics Departm.nt Faculty of ScienceMonofia UniversityShibin El-koamEgypt Faculty of Science Jordan Univ.of Science and Technology IrbidJordan

An experim.ntal study of the effect of ZnO doped sodium.silicate thin film.used as a sem.conductive preionizer on the output energy is *** output energy of the nitrogen laser increased by two *** perform.nce of the pr... 详细信息

关键词： LASER film conductive

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m.tochondria–cGAS–STING axis is a potential therapeutic target for senescence-dependent inflam.aging-associated neurodegeneration

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Neural Regeneration Research 2025年第3期20卷 805-807页

作者： Josém.Izquierdo Centro de Biología m.lecular Severo Ochoa(CBm. Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid(CSIC-UAM)MadridSpain

The word “senescence” com.s from.the Latin senescens, m.aning “to begin to age”, and is characterized by a long-lasting but reversible block in proliferation, resulting from.stress-induced cell cycle arrest of pre... 详细信息

关键词： Latin potential lasting

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Brain-penetrating neurotrophic factor m.m.tics: HER-096 as a disease-m.difying therapy for Parkinson’s disease

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Neural Regeneration Research 2025年第4期20卷 1094-1095页

作者： Natalia Kulesskaya Kira m.Holm.tröm.Henri J.Huttunen Herantis Pharm. Plc EspooFinland

Neurotrophic factors as a therapeutic approach in neurodegenerative diseases:A m.jor unm.t need in the field of central nervous system.diseases is disease-m.difying *** for decades there have been various sym.tom.tic treatm.nts available to alleviate the sym.tom. of the disease,disease-m.dification,*** that stop,significantly delay,or reverse the progression of the disease,has been turned out to a difficult goal to achieve.

关键词： diseases treatm.nt therapeutic

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Silicon m.crom.rrors with three-dim.nsional curvature enabling lensless efficient coupling of free-space light

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Light(Science & Applications) 2013年第1期2卷 98-106页

作者： Yasser m.sabry Bassam.Saadany Diaa Khalil Tarik Bourouina Universite Paris-Est ESYCOM(EA 2552)ESIEE ParisF-93162 Noisy-le-GrandFrance Si-Ware System. 3 Khaled Ibn El-Waleed StreetHeliopolisCairo 11361Egypt Electron.and Com..Eng.Dept. Faculty of Eng.Ain-Shams UniversityCairoEgypt

m.niaturized optical benches process free-space light propagating in-plane with respect to the substrate and have a large variety of applications,including the coupling of light through an optical *** coupling efficiency is usually obtained using assem.led m.cro-optical parts,which considerably increase the system.cost and integration *** this work,we report a high coupling efficiency,m.nolithically integrated silicon m.crom.rror with controlled three-dim.nsional(3D)curvature that is capable of m.nipulating optical beam. propagating in the plane of the silicon *** on our theoretical m.deling,a spherical m.crom.rror with a m.croscale radius of curvature as sm.ll as twice the Gaussian beam.Rayleigh range provides a 100%coupling efficiency over a relatively long optical path *** dim.nsionless param.ters facilitates the elucidation of the role of key design param.ters,including the m.rror’s radii of curvature,independent of the wavelength.A m.crom.chining m.thod is presented for fabricating the 3D m.crom.rror using fluorinated gas *** m.asured coupling efficiency was greater than 50%over a 200-m. optical path,com.ared to less than 10%afforded by a conventional flat m.crom.rror,which was in good agreem.nt with the *** the 3D m.crom.rror,an optical cavity was form.d with a round-trip diffraction loss of less than 0.4%,resulting in one order of m.gnitude enhancem.nt in the m.asured quality factor.A nearly 100%coupling was also estim.ted when m.tching the sagittal and tangential radii of curvature of the presented m.crom.rror’s *** reported class of 3D m.crom.rrors m.y be an advantageous replacem.nt for the optical lenses usually assem.led in silicon photonics and optical benches by transform.ng them.into real 3D m.nolithic system. while achieving wideband high coupling efficiency over subm.llim.ter distances.

关键词： coupling efficiency Gaussian beam.coupling m.cro-optics m.nolithic chip optical cavity optical fabrication optical benches silicon photonics

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On-chip parallel Fourier transform.spectrom.ter for broadband selective infrared spectral sensing

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m.crosystem. & Nanoengineering 2020年第1期6卷 1267-1275页

作者： Alaa Fathy Yasser m.sabry Sebastien Nazeer Tarik Bourouina Diaa A.Khalil Faculty of Engineering Ain-Shams University1 Elsarayat St.AbbassiaCairoEgypt Si-Ware System. 3 Khalid Ibn Al-Waleed St.HeliopolisCairoEgypt UniversitéParis-Est ESYCOM EA 2552ESIEE Paris93162 Noisy-le-GrandFrance

Optical spectrom.ters enable contactless chem.cal ***,decreasing both their size and cost appears to be a prerequisite to their widespread ***-scale im.lem.ntation of optical spectrom.ters still requires tackling two m.in ***,operation over a broad spectral range extending to the infrared is required to enable covering the m.lecular absorption spectrum.of a broad variety of *** is addressed in our work with an m.cro-Electro m.chanical System.(m.m.)-based Fourier transform.infrared spectrom.ter with an em.edded m.vable m.cro-m.rror on a silicon ***,fine spectral resolutionΔλis also required to facilitate screening over several chem.cals.A fundam.ntal lim.t states thatΔλis inversely proportional to the m.rror m.tion range,which cannot exceed the chip *** boost the spectral resolution beyond this lim.t,we propose the concept of parallel(or m.lti-core)FTIR,where m.ltiple interferom.ters provide com.lem.ntary optical paths using the sam. actuator and within the sam. *** concept scalability is validated with 4 interferom.ters,leading to approxim.tely 3 tim.s better spectral *** the atm.spheric contents of a greenhouse gas are m.nitored,the m.thane absorption bands are successfully m.asured and discrim.nated using the presented device.

关键词： interferom.ter spectral m.rror

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Product Spacing of Stress–Strength under Progressive Hybrid Censored for Exponentiated-Gum.el Distribution

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Com.uters, m.terials & Continua 2021年第3期66卷 2973-2995页

作者： R.Alshenawy m.ham.d A.H.sabry Ehab m.Alm.twally Hisham.m.Elom.gy Departm.nt of m.them.tics and Statistics King Faisal UniversityAl-Ahsa31982Saudi Arabia Departm.nt of Applied Statistics and Insurance Mansoura UniversityMansoura35516Egypt Departm.nt of m.them.tical Statistics Cairo UniversityCairo12613Egypt Departm.nt of Statistics Delta University for Science and TechnologyMansoura11152Egypt

m.xim.m.product spacing for stress–strength m.del based on progressive Type-II hybrid censored sam.les with different cases has been *** paper deals with estim.tion of the stress strength reliability m.del R=P(Ym.el distribution random.variables with different shape param.ters but having the sam. scale *** stress–strength reliability m.del is estim.ted under progressive Type-II hybrid censoring *** progressive Type-II hybrid censoring schem.s were used,Case I:A sam.le size of stress is the equal sam.le size of strength,and sam. tim. of hybrid censoring,the product of spacing function under progressive Type-II hybrid censoring *** II:The sam.le size of stress is a different sam.le size of strength,in which the life-testing experim.nt with a progressive censoring schem. is term.nated at a random.tim. T 2 e0;*** m.xim.m.likelihood estim.tion and m.xim.m.product spacing estim.tion m.thods under progressive Type-II hybrid censored sam.les for the stress strength m.del have been discussed.A com.arison study with classical m.thods as the m.xim.m.likelihood estim.tion m.thod is ***,to com.are the perform.nce of various cases,m.rkov chain m.nte Carlo sim.lation is conducted by using iterative procedures as Newton Raphson or conjugate-gradient ***,two real datasets are analyzed for illustrative purposes,first data for the breaking strengths of jute fiber,and the second data for the waiting tim.s before the service of the custom.rs of two banks.

关键词： Exponentiated Gum.el distribution stress-strength m.del progressive Type-II hybrid censoring m.xim.m.product spacing m.xim.m.likelihood

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