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High temperature X-ray diffraction study of the formation of Na_(2)Ti_(3)O_(7) from a mixture of sodium carbonate and titanium oxide

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Journal of Energy Chemistry 2022年第2期31卷 210-218页

作者： Caroline Piffet Bénédicte Vertruyen Frédéric Hatert Rudi Cloots Frédéric Boschini abdelfattah mahmoud GREENMAT CESAM Research UnitChemistry DepartmentUniversity of Liège4000 LiègeBelgium Laboratory of Mineralogy Geology Research UnitUniversity of Liège4000 LiègeBelgium

Na2Ti3O7 has attracted much attention in the field of anode materials for Na-ion batteries thanks to its non-toxicity and very low working potential of 0.3 V vs Na0/Na+.Building a clearer picture of its formation from cheap Na_(2)CO_(3) and TiO_(2) starting materials is therefore of obvious ***,we report new insights from an in-situ high temperature X-ray diffraction study conducted from room temperature to 800°C,complemented by ex-situ *** were thereby able to position the previously reported Na_(4)Ti_(5)O_(12) and Na_(2)Ti_(6)O_(13) intermediate phases in a reaction scheme involving three successive steps and temperature *** and/or broadening of a subset of the Na_(2)Ti_(6)O_(13) reflections suggested a combination of intra-layer disorder with the well-established ordering of successive *** in-situ study was carried out on reproducible mixtures of Na_(2)CO_(3) and TiO_(2) in 1:3 molar ratio prepared by spraydrying of mixed aqueous ***-phase Na_(2)Ti_(3)O_(7) was obtained after only 8 h at 800°C in air,instead of a minimum of 20 h for a conventional solid-state route using the same *** analysis revealed~15 mm diameter granules made up from rectangular rods of a fewmm length presenting electrochemical properties in line with *** the absence of grinding or formation of intimate composites with conductive carbon,the specific capacity of 137 m Ah/g at C/5 decreased at higher rates.

关键词： Formation mechanism High temperature XRD Na_(2)Ti_(3)O_(7) Spray-drying synthesis Na-ion batteries

Galectins dysregulation: A way for cancer cells to invade and pervade

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Oncology Research 2022年第3期30卷 129-135页

作者： mahmoud M.abdelfattah REHAM HELWA Molecular Cancer Biology Group Zoology DepartmentFaculty of ScienceAin Shams UniversityCairoEgypt Faculty of Basic Science King Salman International UniversitySouth SinaiEgypt

Galectins are sticky molecules that bind toβ-*** interactions render them essential players in many cellular *** imbalance of galectin expression was reported in many *** cancer,galectins interact with the extracellular matrix,evade the immune system,and potentially have broad interactions with blood *** the last ten years,since 2010,we did focus on galectin research in different cancer ***ﬁndings showed an interaction between cancer cells and erythrocytes via ***,we found that upregulation of galectins was associated with lymph node metastasis in ovarian ***,with this,we shortly review some important aspects of galectins and their potential importance in more profound understanding of cancer progression and theﬁeld of cancer biomarkers.

关键词： Galectins Cancer Metastasis Erythrocytes Invasion

Palaeoenvironmental Reconstruction of the Early to Middle Miocene Sequence in West Central Sinai, Egypt, as Revealed from Fossil Diatoms

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 354-366页

作者： abdelfattah A. ZALAT Department of Geology Faculty of Science Tanta University Tanta 31527 Egypt

A detailed analysis of the diatoms from the sedimentary sequence exposed in Abu Qada basin, west central Sinai, was used to determine the palaeoenvironmental changes during the Lower to Middle Miocene. A total of 85 diatom species and varieties belonging to 37 genera were identified from 154 samples collected throughout the stratigraphic succession. The lithological characters of the studied samples varied between sandstone, silty interbeds, sandy shales, shales, and terminated with anhydrite and limestones. These rock units are included in two lithostratigraphic formations （Rudies and Kareem）, which are separated by a marked unconformity. The distribution and preservation of fossil diatoms in the sedimentary record are examined with the aim of outlining the temporal and spatial variation in the composition of the diatom assemblages, in order to estimate the changes in depositional environments during the Lower to Middle Miocene. The distributional pattern of the recorded diatom taxa distinguished four diatom eco-zones. The environment of each eco-zone is deduced and a proposed paleobathymetric change and depositional history of the Miocene sediments in the studied area are given.

关键词： palaeoenvironment Miocene sequence diatoms west central Sinai Egypt

Geophysical appraisal of the Abu Madi gas reservoir,Nile Delta Basin,Egypt:Implications for the tectonic effect on the lateral distribution of petrophysical parameters

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Petroleum Research 2022年第4期7卷 511-520页

作者： Mohammad abdelfattah Sarhan Geology Department Faculty of ScienceDamietta UniversityNew Damietta City34517Egypt

The tectonic deformation has a significant influence on the hydrocarbon reservoirs *** effect of this process focuses on the lateral distribution of the petrophysical parameters characterizing the hydrocarbon *** main objective of the current study is to perform a petrophysical examination of the Abu Madi gas reservoir which is the greatest gas-bearing reservoir at Nile Delta Basin in order to examine how far the Messinian tectonics affected the lateral variations of these petrophysical *** petrophysical evaluation was performed based on the wireline log data acquired for five wells,namely,Abu Madi-2,Abu Madi-7,El Qara-3,Nidoco-7,and Nidoco-9 drilled within the Abu Madi *** petrophysical assessment for the most promising zone intervals within the Abu Madi sandstones in the inspected wells show that the total porosity varies between 17%and 22%,the effective porosity ranges from 7%to 19%,the shale volume fluctuates between 16%and 30%,hydrocarbon satu-ration varies from 37%to 76%,and the bulk volume of water varies between 0.02 and *** significant variations in the petrophysical properties of the Abu Madi reservoir are attributed to the tectonic influence during the deposition of the Abu Madi Formation as a part of the Late Miocene synrift megasequence in the Nile Delta *** conclusion confirms that the petrophysical properties of sandstone reservoirs are function of tectonic and structural deformation.

关键词： Abu madi formation Messinian reservoir Nile delta basin Petrophysical parameters Well logging

New prospective gas plays in pliocene sands, offshore Nile Delta Basin: A case study from Kamose-1 well at North Sinai Concession, Egypt

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Petroleum Research 2022年第3期7卷 329-340页

作者： Mohammad abdelfattah Sarhan Geology Department Facultyof ScienceDamietta UniversityNew Damietta City34517Egypt Center of Space Research and Applications(CSRA) Damietta UniversityNew Damietta CityEgypt

The Pliocene sands in the offshore parts of the Nile Delta Basin represent significant gas *** targets have been recently discovered in different places along the offshore Nile Delta *** present work focuses on the possibility of discovering new natural gas resources at North Sinai Concession through an integrated method between seismic and well logs data interpretations.A case study from Kamose-1 Well at Kamose Field,North Sinai Concession has been *** quantitative explanation for the well log data of Kamose-1 Well has revealed two zones expected to be gas-bearing *** intervals are located between depths;1174–1186 m(zone I)and between 1429 and 1503 m(zone II).The calculated petrophysical parameters for these zones exhibit low water saturation(24–43%),high effective porosity(30–31%),low shale volume(21–26%),high total porosity(37–38%)and low bulk volume of water(0.07–0.12).Zone II(74 m thick)shows a clear bright spot on the seismic profiles covering the study area,while,zone I is beyond seismic resolution(12 m thick).Several seismic bright spots have been outlined on the seismic data nearby Kamose-1 *** comparison between the newly outlined seismic bright spots with the drilled one in Kamose-1 Well exhibited a great ***,these prospects are expected to be new targets for gas exploration in the Pliocene succession at North Sinai Concession.

关键词： Petrophysical evaluation Pliocene sands Seismic bright spot Kamose field Nile delta basin

Predictors of time-to-nadir serum creatinine after drainage of bilaterally obstructed kidneys due to bladder cancer

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Current Urology 2023年第4期17卷 246-250页

作者： Rabea Ahmed Gadelkareem Ahmed mahmoud Abdelraouf abdelfattah Ibrahim Ahmed Ahmed Mohammed El-Taher Hosny mahmoud Behnsawy Assiut Urology and Nephrology Hospital Faculty of MedicineAssiut UniversityAssiut71515Egypt

Background:There are persistent controversies about the outcomes and benefits of drainage of malignant ureteral obstruction by percutaneous nephrostomy(PCN).This study aimed to assess the predictors of the time-to-nadir(TTN)of serum creatinine(SCr)levels after drainage of bilaterally obstructed kidneys(BOKs)due to bladder cancer(BC)by *** and methods:This prospective nonrandomized study included patients with BOKs due to BC treated by PCN between April 2019 and March *** primary outcome measure was ***:Of the 55 patients with a median age(range)of 66 years(47-86 years),32(58.2%)had a normal nadir SCr and 23(41.8%)had a high nadir SCr within 21 days after drainage of BOKs due to *** nadir SCr was associated with a higher mean age(p=0.011)and lower body mass index(BMI,p=0.043).However,patients with normal nadir SCr had a significantly shorter TTN(p=0.023)and an increased mean SCr trajectory(p<0.001)during *** multivariate analysis,low urine output at presentation(p=0.021)and high BMI(p=0.006)were associated with longer ***,the mean parenchymal thickness(p=0.428)and laterality of drainage(p=0.466)were not associated with the mean TTN and SCr normalization *** to the modified Clavien-Dindo classification,8 cases of hematuria were managed conservatively(grade 2),and 2 cases of PCN slippage were repositioned using local anesthesia(grade 3).Conclusions:Despite the safety of PCN for drainage of BOKs due to BC,more than 41%of the patients failed to have a normal nadir *** low urine output and high BMI were associated with longer *** of drainage had no significant effects on the TTN and SCr trajectory.

关键词： Bladder cancer Bilaterally obstructed kidneys Malignant ureteral obstruction Percutaneous nephrostomy Time-to-nadir Serum creatinine

Acute kidney injury due to bilateral malignant ureteral obstruction:Is there an optimal mode of drainage?

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World Journal of Nephrology 2022年第6期11卷 146-163页

作者： Rabea Ahmed Gadelkareem Ahmed mahmoud Abdelraouf Ahmed Mohammed El-Taher abdelfattah Ibrahim Ahmed Department of Urology Assiut Urology and Nephrology HospitalFaculty of MedicineAssiut UniversityAssiut 71515AssiutEgypt

There is a well-known relationship between malignancy and impairment of kidney functions,either in the form of acute kidney injury or chronic kidney *** the former,however,bilateral malignant ureteral obstruction is a surgically correctable factor of this complex *** warrants urgent drainage of the kidneys in emergency ***,there are multiple controversies and debates about the optimal mode of drainage of the bilaterally obstructed kidneys in these *** review addressed most of the concerns and provided a comprehensive presentation of this topic from the recent ***,we provided different perspectives on the management of the bilateral obstructed kidneys due to *** the frequent trials for improving the success rates and functions of ureteral stents,placement of a percutaneous nephrostomy tube remains the most recommended tool of drainage due to bilateral ureteral obstruction,especially in patients with advanced ***,the disturbance of the quality of life of those patients remains a major unresolved *** the unfavorable prognostic potential of the underlying malignancy and the various risk stratification models that have been proposed,the response of the kidney to initial drainage can be anticipated and evaluated by multiple renal prognostic factors,including increased urine output,serum creatinine trajectory,and time-to-nadir serum creatinine after drainage.

关键词： Acute kidney injury Kidney Malignancy Percutaneous nephrostomy Ureteral obstruction Ureter

Adaptive Control System for Biogas Power Plant Using Model Predictive Control

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1193-1204页

作者： Samaa Fawzy Mohammed Saeed abdelfattah Eladl Magdi El-Saadawi Electrical Engineering Department Mansoura UniversityMansouraEgypt

This paper presents an adaptive control system using model predictive control for a biogas-fueled power *** control scheme is derived from an anaerobic digestion model that includes the concentration of biodegradable volatile solid in the reactor,the concentration of volatile solid in influent,the concentration of acidogens,and the concentration of *** these concentrations are the state variables of model predictive *** whole biogas-fueled power system has been modeled,implemented,and tested in MATLAB/Simulink *** validate the performance of the proposed controller,different operation conditions are studied and *** simulation results prove the effectiveness and the applicability of the proposed control system under different operating conditions.

关键词： Anaerobic digestion micro-turbine model predictive control state space biogas

Study of the prevalence and association of ocular chlamydial conjunctivitis in women with genital infection by Chlamydia trachomatis, Mycoplasma genitalium and Candida albicans attending outpatient clinic

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International Journal of Ophthalmology(English edition) 2016年第8期9卷 1176-1186页

作者： Rania Abdelmonem Khattab Maha Mohssen abdelfattah Microbiology and Immunology Department Faculty of Pharmacy Cairo University Microbiology and Immunology Department Research Institute of Ophthalmology

AIMTo determine the association between chlamydial conjunctivitis and genital infection by Chlamydia trachomatis, Mycoplasma genitalium and Candida albicans, in addition to the possible relationship between cultured bacterial pathogens and oculogenital chlamydial *** study was performed on 100 (50 symptomatic and 50 asymptomatic) women attending the Gynecological and Obstetric outpatient clinic of Alzahra hospital, Alazhar University. Simultaneously a conjunctival swab was taken from these patients. Polymerase chain reaction (PCR) was done on DNA extracted from both vaginal and conjunctival swab samples. Culture for both vaginal and conjunctival swabs was also *** albicans was the predominant organism isolated by culture in 20% and 40% of conjunctival and vaginal swabs respectively. By the PCR method, ocular Chlamydia trachomatis was present in 60% of symptomatic women, while genital Chlamydia trachomatis infection was present in 30% of symptomatic women. The results of this method also indicated that 25/50 (50%) vaginal swabs were positive with PCR for Candida albicans versus 15/50 (30%) were PCR positive in conjunctival swab. Mycoplasma genitalium was present in only 10% of vaginal swabs. Concomitant oculogenital PCR positive results for Chlamydia trachomatis and Candida albicans were 30% and 28% *** Chlamydia trachomatis was associated with genital Chlamydia trachomatis in a high percentage of women followed by Candida albicans. Cultured bacterial organisms do not play a role in enhancement of Chlamydia trachomatis infection.

关键词： Chlamydia trachomatis Mycoplasma genitalium Candida albicans vaginal swabs polymerase chain reaction