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Dynamics of CO_2 Emission and Biochemical Properties of a Sandy Calcareous Soil Amended with Conocarpus Waste and Biochar

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Pedosphere 2015年第1期25卷 46-56页

作者： Mohamed el-MAHROUKY ahmed Hamdy el-NAGGAR Adel Rabie USMAN Mohammad Al-WABel Soil Science Department College of Food & Agriculture Sciences King Saud University Department of Soil Science Faculty of Agriculture Ain Shams University Department of Soils and Water Faculty of Agriculture Assiut University

Biochar is a carbon-rich product obtained by biomass pyrolysis and considered a mean of carbon sequestration. In this research, a sandy calcareous soil from the Farm of the College of Food & Agriculture Sciences, King Saud University, Saudi Arabia, was amended with either woody waste of Conocarpus erectus L.(CW) or the biochar(BC) produced from CW at rates of 0(control), 10, 30 and 50 g kg-1. The effects of the amendments on soil p H, dissolved organic carbon(DOC), microbial biomass carbon(MBC), CO2 emission and metabolic quotient(q CO2) of the sandy calcareous soil were studied in a 60-d incubation experiment. The results showed that the addition of CW led to a significant decrease in soil p H compared to the control and the addition of BC. The CO2-C emission rate was higher in the first few days of incubation than when the incubation time progressed. The cumulative CO2-C emission from the soil amended with CW, especially at higher rates, was higher(approximately 3- to 6-fold) than that from the control and the soil amended with BC. The BC-amended soil showed significant increases in CO2-C emission rate during the first days of incubation as compared to the non-amended soil, but the increase in cumulative CO2-C emission was not significant after 60 d of incubation. On the other hand, CW applications resulted in considerably higher cumulative CO2-C emission, MBC and DOC than the control and BC applications. With the exception of 0 day(after 1 h of incubation), both CW and BC applications led to lower values of q CO2 as compared to the control. The power function kinetic model satisfactorily described the cumulative CO2-C emission. Generally, the lowest values of CO2 emission were observed in the soil with BC, suggesting that the contribution of BC to CO2 emission was very small as compared to that of CW.

关键词： dissolved organic carbon metabolic quotient microbial biomass carbon power function kinetic model soil pH

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Syntheses of Some 3-[1′(1′H)-Substituent-pyrazol-5′-yl] benzo[5,6]coumarins

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Chinese Journal of Chemistry 2002年第7期20卷 670-675页

作者： E-LDEEN Ibrahim Mohey AL-WAKEel el-Sayed Ismail el-MAWLA ahmed Gad Faculty of Education Suez Canal University Port-said Egypt Faculty of Science Suez Canal University Ismailia Egypt

3-[1′ (1′ H)-Substituent-pyrazol-5′-yl] benzo[5, 6] coumarins and3-(1′,2′-oxazol-5′-yl)benzo[5,6]coumarin were prepared via condensation of3-(2′-formyl-1′-chlorovinyl) benzo [5, 6] coumarin with hydrazine derivatives or *** of 3-[1′(1′ H)-pyrazol-5′-yl] benzo[5, 6] coumarin with alkyl halidcs, olefiniccompounds or acid chlorides are described.

关键词： heterocycle synthesis pyrazol-5′-ylbenzo [5, 6] coumarin alkylation atpyrazole nitrogen

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Epigenetic regulation of insulin-like growth factor axis in hepatocellular carcinoma

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World Journal of Gastroenterology 2016年第9期22卷 2668-2677页

作者： Hend Mohamed el Tayebi ahmed Ihab Abdelaziz The Molecular Pathology Research Group Department of Pharmacology and Toxicology Faculty of Pharmacy and Biotechnology German University in Cairo

The insulin-like growth factor(IGF) signaling path-way is an important pathway in the process of hepa-tocarcinogenesis,and the IGF network is clearly dysregulated in many cancers and developmental *** hepatocellular carcinoma(HCC),only a minority of patients are eligible for curative treatments,such as tumor resection or liver ***,there is a high recurrence of HCC after surgical tumor *** research efforts have focused on targeting IGF axis members in an attempt to find therapeutic options for many health *** this review,we shed lights on the regulation of members of the IGF axis,mainly by micro RNAs in *** RNAs in HCC attempt to halt the aberrant expression of the IGF network,and a single micro RNA can have multiple downstream targets in one or more signaling *** micro RNAs is a relatively new approach for identifying an efficient radical cure for HCC.

关键词： Hepatocellular carcinoma Insulin-like growth factors Insulin-like growth factor receptors Epigenetics microRNAs

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Preparation of Antibacterial electrospun PVA / Regenerated Silk Fibroin Nanofibrous Composite Containing Ciprofloxacin Hydrochloride as a Wound Dressing

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Journal of Donghua University(English Edition) 2014年第5期31卷 566-571页

作者： el-SHANSHORY ahmed 陈维明莫秀梅 College of Textiles Donghua University State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyDonghua University State Key Laboratory of Bioreactor Engineering East China University of Science and Technology

electrospinning technique was used for the fabrication of poly( vinyl alcohol)( PVA) / regenerated silk fibroin( SF)composite nanofibers,loaded with ciprofloxacin HCl( CipH Cl) as a wound *** PVA / SF / CipH Cl composite nanofibers were stabilized against dissolving in water by heating in an oven at155 ℃ for 5 *** of CipH Cl into electrospun nanofibers was confirmed by SEM and FT-IR *** the mechanical properties test illustrated that the addition of CipH Cl enhanced the mechanical properties of PVA and PVA / SF *** antibacterial activities against Escherichia coli( ***)( gram-negative) and Staphylococcus aureus( ***)( gram-positive) organisms were evaluated by disk diffusion method;and results suggested that electrospun PVA / CipH Cl and PVA / SF /CipH Cl composite nanofibers showed a remarkable antibacterial activity.

关键词： electrospinning poly ( vinyl alcohol) ( PVA ) regeneratedsilk fibroin ( SF ) mechanical properties antibacterial activity wounddressing

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Amination of biochar surface from watermelon peel for toxic chromium removal enhancement

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Chinese Journal of Chemical Engineering 2021年第8期34卷 199-222页

作者： Mohamed A.el-Nemr Ibrahim M.A.Ismail Nabil M.Abdelmonem ahmed el Nemr Safaa Ragab Department of Chemical Engineering Faculty of EngineeringCairo UniversityGizaEgypt Renewable Energy Program Zewail City of Science and TechnologyEgypt Environmental Division National Institute of Oceanography and FisheriesKayet BeyEl-AnfoushyAlexandriaEgypt

Watermelon peel residues were used to produce a new biochar by dehydration *** new biochar has undergone two methods of chemical modification and the effect of this chemical modification on its ability to adsorb Cr(VI)ions from aqueous solution has been *** biochars,Melon-B,Melon-BO-NH_(2) and Melon-BO-TETA,were made from watermelon peel via dehydration with 50%sulfuric acid to give Melon-B followed by oxidation with ozone and amination using ammonium hydroxide to give Melon-BO-NH_(2) or Triethylenetetramine(TETA)to give *** prepared biochars were characterized by BET,BJH,SEM,FT-IR,TGA,DSC and EDAX *** highest removal percentage of Cr(VI)ions was 69%for Melon-B,98%for Melon-BO-NH_(2) and 99%for Melon-BO-TETA biochars of 100 mg·L^(−1) Cr(VI)ions initial concentration and 1.0 g·L^(−1) adsorbents *** unmodified biochar(Melon-B)and modified biochars(Melon-BO-NH_(2) and Melon-BO-TETA)had maximum adsorption capacities(Q_(m))of 72.46,123.46,and 333.33 mg·g^(−1),*** amination of biochar reduced the pore size of modified biochar,whereas the surface area was *** obtained data of isotherm models were tested using different error function *** Freundlich,Tempkin and Langmuir isotherm models were best fitted to the experimental data of Melon-B,Melon-BO-NH_(2) and Melon-BO-TETA,*** adsorption rate was primarily controlled by pseudo-second–order rate ***,the functional groups interactions are important for adsorption mechanisms and expected to control the adsorption *** adsorption for the Melon-B,Melon-BO-NH_(2) and Melon-BO-TETA could be explained for acid–base interaction and hydrogen bonding interaction.

关键词： Waste treatment Powder technology Citrullus lanatus Hexavalent chromium Biochar amination Adsorption

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Voltage imbalance mitigation in an active distribution network using decentralized current control

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Protection and Control of Modern Power Systems 2023年第2期8卷 68-84页

作者： ahmed M.M.Nour ahmed A.Helal Magdi M.el-Saadawi ahmed Y.Hatata Alexandria Higher Institute of Engineering and Technology(AIET) AlexandriaEgypt Department of electrical and Control Engineering Arab Academy for Science and Technology and Maritime TransportAlexandriaEgypt Department of electrical Engineering Faculty of EngineeringMansoura UniversityMansouraEgypt Department of electrical Engineering College of EngineeringShaqra UniversityShaqraKingdom of Saudi Arabia

Voltage imbalance(VI)is caused by the difference in connected single-phase load or generation in a low voltage distribution network(DN).VI increase in a smart distribution grid is due to the current practice of increasing single-phase distributed generators such as photovoltaic(PV)*** paper proposes a decentralized control method to mitigate VI using distributed batteries included in smart grid interfaced residential PV *** mitigate VI using the batteries in this way,five challenges must be overcome,i.e.,equalizing all battery stress currents within the DN,mitigating VI in abnormal conditions such as signal loss among bus controllers,being immune from the distorted feedback measurements,minimizing the steady-state error at different loads,and overcoming the insufficient number or capacity of the distributed batteries at the same *** fuzzy logic controllers(FLC)are proposed at each bus to overcome these five tasks based on a decentralized control *** proposed decentralized control based on FLC is compared with centralized control based on a PI *** proposed control method is tested and verified using simulations in the MATLAB/Simulink software,and the results validate the ability of the scheme to alleviate VI on a smart distribution network under both normal and abnormal conditions.

关键词： Fuzzy controller Distributed batteries Decentralized control Voltage imbalance Distributed PV

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Synthesis and evaluation of some novel additives as antioxidants and corrosion inhibitors for petroleum fractions

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Petroleum Science 2014年第1期11卷 161-173页

作者： ahmed el-Mekabaty Osman M. O. Habib Department of Chemistry Faculty of Science Mansoura University

Benzoxazinone 2 was prepared and reacted with formamide,acetamide,some primary aromatic amines and heterocyclic amines giving the corresponding quinazolone derivatives 3-15 *** reaction of benzoxazinone 2 with hydrazine hydrate and phenyl hydrazine was also *** compounds of the synthesized products were evaluated as antioxidants and corrosion inhibitors for gasoline engine lubricating *** highest antioxidant activities were obtained with compounds *** optimum concentration recommended for these new additives was found to be *** for 1L ofoil for compounds *** addition,some of the highly effective antioxidant additives,namely 10-15,were thermally analyzed by using thermogravimetric analysis （TGA） and differential thermal gravimetric analysis （DTGA） techniques and the results indicated that compounds are thermally stable and could be used under thermal ***,a comparison of the oxidation stability between the tested oil containing the prepared products and lubricating oil containing commercial additives was also studied.

关键词： Benzoxazinone quinazolinone thermal stability antioxidant additives anticorrosive additives

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A Novel Approach in Hydrogeochemical Exploration for Uranium Mineralization:an Example from West Central Sinai,Egypt

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Acta Geologica Sinica(English Edition) 2015年第6期89卷 1895-1913页

作者： ahmed E.el-RAYES Mohamed O.ARNOUS Suez Canal University Faculty of SciencesGeology Department

Groundwater in contact with ore deposits may acquire a chemical composition that could be used as a guide for exploration. Eight well-water samples are collected from a known uraniummineralized area near Abu Zenima, west central Sinai to examine the applicability of using the hydrogeochemical technique in the search for uranium mineralization in similar arid areas. The analytical chemical data of the ground water is compared with ground radiometric measurements. The obtained results indicate that groundwater affected by uranium mineralization has a specific relativity of major anions expressed essentially as SO_4〉Cl〉HCO_3 and to a lesser extent as Cl〉SO_4〉HCO_3, associated as a rule with low magnesium content. This association constitutes a signature of uranium mineralization on the composition of groundwater in west central Sinai and could be used as an important exploration guide in the search for uranium deposits in similar areas. Anomalies in Ni, Fe, Zn and Cr and other pathfinder elements in groundwater can furnish geochemical guides to uranium ores. The immobile trace element anomalies, including Zn, Ni and Fe are strongly distributed near the orebody; whereas the relatively mobile trace elements, including Co, U, V and Cr, constitute the dispersion haloes away from the orebody. A new hydrogeochemical discrimination diagram is constructed to be used as a quick and cost effective exploration tool in the search for uranium occurrences in environmentally similar arid areas. Based on the obtained results, a new site for uranium occurrence, west of W. Baba, is delineated and recommended for future detailed geological and geochemical surveying.

关键词： Hydrogeochemical exploration Uranium ores geospatial mapping graphical explorationtool remote sensing Sinai

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Using nanotechnology to prevent fines migration while production

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Petroleum 2021年第2期7卷 168-177页

作者： Mohamed Mansour Mohamed eleraki ahmed Noah el-Abbas Moustafa Faculty of Science Zagazig UniversityEgypt Egyptian Petroleum Research Institute(EPRI) Egypt The British University Egypt

Formation damage due to fines migration is a major reason for well productivity decline for oil and gas *** fines are small enough to pass through pore throats causing pore plugging and permeability *** factors affect fines migration such as flow rate,salinity,pH value,reservoir temperature and oil polarity,as well as changes in chemical environment induced by Enhanced Oil Recovery(EOR)*** paper focuses on the effect of flow rates on fines detachment from the grain surfaces,which causing permeability *** the fluid inside the reservoir moves towards the wellbore,the fluid velocity increases,when the fluid reaches the critical flow rate these fines can be picked up into the *** fines captured by thinner pore throats causing pore plugging and permeability *** concentrations of nanoparticles were used to fix these fines on their sources and prevent their mobilization at high flow *** unique technique used in this study is changing the potential surfaces between fines and grain surfaces to prevent fines movement above the critical flow ***_(2)and MgO NPs used in this study can be adsorbed on the pore surfaces and reduce the repulsion forces between fines and pore ***_(2) and MgO nanoparticles at different concentrations(0.25,0.50 and 0.75 g/L)were used on treating the Abu-Rawash sandstone reservoir using Formation Damage System Cell *** experimental studies showed that using MgO NPs would prevent fines detachment from the pore surfaces and decrease the reduction of permeability at high flow rates more than SiO_(2) *** optimum concentration of MgO NPs was at 0.5 g/L as the permeability remediation at this concentration reaches to 64.83%.

关键词： Formation damage Fines migration Nanoparticles Zeta potential Permeability reduction Fluid flow rate

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Decentralized Networked Control System Design Using Takagi-Sugeno(TS) Fuzzy Approach

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International Journal of Automation and computing 2015年第2期12卷 125-133页

作者： Chedia Latrach Mourad Kchaou Abdelhamid Rabhi ahmed el Hajjaji Laboratory of Modelisation Information and SystemUniversity of Picardie Jules Verne electrical Engineering Department National Engineering School of SfaxUniversity of Sfax

This paper proposes a new method for control of continuous large-scale systems where the measures and control functions are distributed on calculating members which can be shared with other applications and connected to digital network *** first, the nonlinear large-scale system is described by a Takagi-Sugeno(TS) fuzzy model. After that, by using a fuzzy LyapunovKrasovskii functional, sufficient conditions of asymptotic stability of the behavior of the decentralized networked control system(DNCS),are developed in terms of linear matrix inequalities(LMIs). Finally, to illustrate the proposed approach, a numerical example and simulation results are presented.

关键词： Continuous large-scale systems decentralized static output feedback fuzzy control networked control systems(NCS) Takagi-Sugeno(T

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