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Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose Aerogel Networks Enhanced Thermal Conductivity and electromagnetic Absorbing of Epoxy Composites

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Nano-Micro Letters 2022年第7期14卷 209-227页

作者： Duo Pan Gui Yang Hala MAbo-Dief Jingwen Dong Fengmei Su Chuntai Liu Yifan Li Ben Bin Xu Vignesh Murugadoss Nithesh Naik salah Mel-Bahy Zeinhom Mel-Bahy Minan Huang Zhanhu Guo Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002People’s Republic of China Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK Integrated Composites Laboratory(ICL) Department of Chemical and Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Advanced Materials Division Engineered Multifunctional Composites(EMC)Nanotech LLCKnoxvilleTN 37934USA College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Mechanical and Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka 576104India Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry Al-Azhar UniversityNasr CityCairo 11884Egypt

With the innovation of microelectronics technology, the heat dissipation problem inside the device will face a severe test. In this work, cellulose aerogel(CA) with highly enhanced thermal conductivity(TC) in vertical planes was successfully obtained by constructing a vertically aligned silicon carbide nanowires(SiC NWs)/boron nitride(BN) network via the ice template-assisted strategy. The unique network structure of SiC NWs connected to BN ensures that the TC of the composite in the vertical direction reaches 2.21 W m^(-1) K^(-1) at a low hybrid filler loading of 16.69 wt%, which was increased by 890% compared to pure epoxy(EP). In addition, relying on unique porous network structure of CA, EP-based composite also showed higher TC than other comparative samples in the horizontal direction. Meanwhile, the composite exhibits good electrically insulating with a volume electrical resistivity about 2.35 × 10^(11) Ω cm and displays excellent electromagnetic wave absorption performance with a minimum reflection loss of-21.5 dB and a wide effective absorption bandwidth(ellent multifunctional performances in microelectronic packaging applications.

关键词： Epoxy Ice template Vertical alignment Thermal conductivity Multifunctionality

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Prophylactic effect of vitamin E against hepatotoxicity,nephrotoxicity,haematological indices and histopathology induced by diazinon insecticide in mice

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Current Zoology 2009年第3期55卷 219-226页

作者： Nahla S.el-SHENAWY Rasha A.AL-EISA Fawzia el-SALMY Omema salah Biology Department Faculty of ScienceTaif UniversityKingdom of Saudi Arabia

Considering that the involvement of reactive oxygen species(ROS)has been implicated in the toxicity of various pesticides,this study was designed to study the ameliorative effect of Vitamin E(100 mg/kg body weight)on mice(25-30 mg)treated with diazinon(32.5 or 16.25 mg/kg body weight)organophosphate insecticide for 14 *** DZN exposure and the protective effects of vitamins E(vitE)were evaluated for their effects on haematological indices,the enzymes concerning liver damage [plasma alanine aminotransferase(ALT),aspartate aminotaransferase(AST),alkaline phosphatise(ALP),and some parameters of kidney function(urea and creatinine)in ***,the histopathological changes in liver and kidney tissue were *** high dose of diazinon(DZNH)decreased the body weight significantly at the end of ***,the liver and kidney were examines for histopathological *** high dose of diazinon decreased body weight ***,there was a statistically significant decrease in haemoglobin(Hb),red blood cell(RBC)and hematocrit(Hct)in diazinon-treated mice compared to *** decrease was partially remedied in the diazinon-treated group that also received *** in the liver and kidney tissues was also evident as elevated plasma ALT,AST,ALP,urea and *** partially counteracts the toxic effect of DZN and repairs tissue damage in the liver and kidney,especially when supplemented to 1/4 LD_ 50 intoxicated *** changes in liver and kidney were observed only in 32.5 mg/kg DZN given *** results suggest that the effects of DZN are dose *** pathological findings were observed in vitE + DZN-treated *** to the present study,we conclude that vitE can reduce the detrimental impacts of diazinon on haematological indicies,as well as liver and kidney function.

关键词：农药有机磷毒性血液学

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Effect of annealing atmospheres on the scintillation properties of Ce^(3+)‑doped YAG nanoscintillator

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Radiation Detection Technology and Methods 2023年第3期7卷 447-456页

作者： Billel Zahra Lakhdar Guerbous Hicham Bousbia‑salah Allaoua Boukerika electronic Department Nuclear Research Center of Birine(CRNB)BP 180Ain OusseraDjelfaAlgeria Physics Division Nuclear Research Center of Algiers(CRNA)Algiers 02Bd Frantz FanonBP 39916000 AlgiersAlgeria electronic Department National Polytechnic School(ENP)10 Rue des Freres OudekBP 18216200 El‑HarrachAlgiersAlgeria

Background In this study,three sample detectors have been prepared by using cerium-activated YAG nanoscintillator(Y_(3)Al_(5)O_(12):Ce^(3+))synthesized by sol-gel method and heat-treat at 900°C for 2 h in different atmospheres such as vacuum,air and *** Many studies about YAG:Ce^(3+)single crystal have been carried out,but the material at the nanoscale remains not enough *** objective of the present paper is to investigate the effects of annealing atmosphere on the scintillation properties and identify the suitable atmosphere that allow to design radiation detectors with high scintillation *** In order to accurately assess the scintillation properties,the nanoscintillator sample powders have been designed as a detector,in which,preparation operations such as surface homogenization and efficiency coupling with photomultiplier tube(PMT)window were *** study was performed usingγ-rays 662 keV released from137Cs radioactive source,the bi-alkali GDB-4FF PMT was used as a *** instrumentation chain was set up in order to collect the pulse height spectra,NaI:Tl single-crystal scintillator was used as a reference detector to estimate the scintillation light *** delayed coincidence method was used for measuring the scintillation decay time of nanoscintillator sample *** The sample detector annealed at vacuum atmosphere exhibits the best scintillation properties,the scintillation light yield was estimated to be 14,600±3400 ph/MeV and the fast component in the scintillation decay was 90 *** The vacuum is the suitable atmosphere which allows the development of radiation detectors with high scintillation efficiency.

关键词： Nanoscintillator YAG:Ce^(3+) Scintillation properties γ-rays 662 keV Photomultiplier tube Sample detectors Annealing atmosphere

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The effect of cryotherapy application before versus after subcutaneous anticoagulant injection on pain intensity and hematoma formation: A quasi-experimental design

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International Journal of Nursing Sciences 2018年第3期5卷 223-229页

作者： Dalia salah el-Deen Naglaa F.A.Youssef Medical-Surgical Nursing Department Faculty of NursingCairo UniversityEgypt Medical-Surgical Nursing Department College of NursingPrincess Nourah bint Abdulrahman UniversityKingdom of Saudi Arabia

Objective:To investigate the effect of cryotherapy application before versus after subcutaneous anticoagulant injection(SCAI)on pain intensity and hematoma ***:A quasi-experimental design was utilized.A convenient sample of 105 adult patients,who were admitted to one of the biggest teaching hospitals in Cairo and receiving SCAI,were recruited over a period of six *** were randomly allocated into three groups:A Control group who received the routine hospital care(G1,n=35)and two intervention group who received cryotherapy for 5-min(G2:cryotherapy applied before SCAI,n=35;G3:cryotherapy applied after SCAI,n=35).Demographic and medical history data sheet,Pain Numeric Rating Scale and Hematoma Formation and Size Assessment Scale were used to collect the ***:The pain intensity among the patients in the two intervention groups(G2:Median=1.0;G3:Median=0)was significantly lower than in the control group(G1,Median=3.0).No significant difference was found between G2 and G3(P=0.728).Applying cryotherapy after SCAI(G3)decreased the frequency of hematoma formation(48hrs=31.4%&72hrs=28.5%)compared to applying it before injection(G2,100%)or not applying it(G1,100%).The size of hematoma in G3 was smaller than that in G2(P<0.01).Conclusion:Applying cryotherapy significantly decreased pain intensity and hematoma occurrence/*** cryotherapy after injection was more effective in preventing hematoma formation and decreasing its size than applying it before injection.

关键词： Anticoagulants Cryotherapy Hematoma Injections Subcutaneous Pain

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Paediatric gastrointestinal disorders in SARS-CoV-2 infection:Epidemiological and clinical implications

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World Journal of Gastroenterology 2021年第16期27卷 1716-1727页

作者： Mohammed Al-Beltagi Nermin Kamal Saeed Adel salah Bediwy Yasser el-Sawaf Department of Pediatric Faculty of MedicineTanta UniversityTanta 31527AlgharbiaEgypt Department of Pediatrics University Medical CenterArabian Gulf UniversityManama 26671Bahrain Microbiology Section Pathology DepartmentSalmaniya Medical ComplexManama 12Bahrain Department of Microbiology Royal College of Surgeons in Ireland-BahrainBahrainBusaiteen 15503MuharraqBahrain Department of Chest Diseases Tanta UniversityTanta 31527AlgharbiaEgypt Department of Pulmonology University Medical CenterArabian Gulf UniversityManama 26671Bahrain Department of Tropical Medicine Tanta UniversityTanta 31527AlgharbiaEgypt Department of Gastroenterology University Medical CenterArabian Gulf UniversityManama 26671Bahrain

The coronavirus disease 2019(COVID-19)pandemic is a threat worldwide for individuals of all ages,including *** manifestations could be the initial presenting manifestation in many patients,especially in *** symptoms are more common in patients with severe disease than in patients with non-severe *** 48.1%of patients had a stool sample that was positive for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)viral *** typically form 1%-8%of all laboratoryconfirmed cases of *** manifestations of COVID-19 in children are not rare,with a prevalence between 0 and 88%,and a wide variety of presentations,including diarrhoea,vomiting,and abdominal pain,can develop before,with or after the development of respiratory *** manifestations such as appendicitis or liver injury could also appear,especially in the presence of multisystem inflammatory *** this review,we discussed the epidemiology of COVID-19 gastrointestinal diseases in children as well as their implications on the diagnosis,misdiagnosis,prognosis,and faecal-oral transmission route of COVID-19 and the impact of gastrointestinal diseases on the gut microbiome,child nutrition,and disease management.

关键词： COVID-19 SARS-CoV-2 Gastrointestinal diseases Children Dysbiosis Faecal-oral transmission

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Numerical Investigation & Comparison of a Tandem-Bladed Turbocharger Centrifugal Compressor Stage with Conventional Design

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Journal of Thermal Science 2014年第6期23卷 523-534页

作者： Syed Noman Danish Shafiq Rehman Qureshi Abdelrahman el-Leathy salah Ud-Din Khan Usama Umer Ma Chaochen Sustainable Energy Technologies Center King Saud University National University of Sciences and Technology PNS JauharKarachiPakistan Mechanical Engineering Department King Saud University FARCAMT Advanced Manufacturing InstituteKing Saud University Beijing Institute of Technology

Extensive numerical investigations of the performance and flow structure in an unshrouded tandem-bladed centrifugal compressor are presented in comparison to a conventional *** characteristics are explored for various tip clearance levels,axial spacings and circumferential *** impeller was modified to tandem-bladed design with no modifications in backsweep angle,meridional gas passage and camber distributions in order to have a true comparison with conventional *** degradation is observed for both the conventional and tandem designs with increase in tip ***-equation models for correlating stage characteristics with tip clearance are *** two designs,it is clearly evident that the conventional design shows better performance at moderate flow ***;near choke flow,tandem design gives better results primarily because of the increase in throat *** point flow rate also seems to drop for tandem compressor resulting in increased range of operation.

关键词：数值模拟离心式压缩机叶片设计串联设计叶尖间隙流动结构方程模型经营范围

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Effect of treating chronic hepatitis C with direct-acting antivirals on extrahepatic cutaneous manifestations

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World Journal of Hepatology 2020年第10期12卷 841-849页

作者： Mohamed el Kassas Osama MO Hegazy Eman M salah Department of Endemic Medicine Faculty of MedicineHelwan UniversityCairo 11795Egypt Department of Dermatology Venereology and AndrologyFaculty of MedicineHelwan UniversityCairo 11795Egypt

BACKGROUND Hepatitis C virus(HCV)is a disease with a significant global impact,affecting approximately 2%-2.5%of the world’s *** direct-acting antivirals(DAAs)have been introduced over the past few years with great success in viral *** association of chronic HCV infection with a wide spectrum of cutaneous manifestations has been widely reported in the *** To assess the effect of treating HCV with DAAs on the extrahepatic cutaneous manifestations of *** This prospective observational study included 1039 HCV positive Egyptian patients who were eligible to receive DAAs.A total of 30 patients were diagnosed with extrahepatic cutaneous manifestations and fulfilled the inclusion criteria of the *** these patients,6 had classic lichen planus,8 were diagnosed with psoriasis vulgaris and 16 had *** patients received DAAs from October 2018 to July 2019 in the form of a three-month course of sofosbuvir/daclatasvir *** with lichen planus or psoriasis were dermoscopically evaluated before treatment and 6 mo after treatment,while patients with hepatic pruritus were assessed using the 12-Item Pruritus Severity Scale over the same *** All patients with psoriasis showed significant improvement in all psoriatic plaques,and all patients with hepatic pruritus scored 0 on the 12-Item Pruritus Severity Scale indicating total improvement of *** addition,four of six patients with lichen planus showed complete *** Treatment of HCV with DAAs was significantly effective in improving virusrelated extrahepatic cutaneous manifestations.

关键词： Directly acting antivirals Extrahepatic manifestations Hepatitis C virus Lichen planus Pruritus Cutaneous manifestations

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Effect of Pd or Ir on the catalytic performance of Mo/H-ZSM-5 during the non-oxidative conversion of natural gas to petrochemicals

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Journal of Natural Gas Chemistry 2008年第4期17卷 337-343页

作者： Ahmed K.Aboul-Gheit Ahmed E.Awadallah salah M.el-Kossy Abdel-Lateef H.Mahmoud Process Development Division Egyptian Petroleum Research Institute Faculty of Science Department of ChemistryMNF University Ageeba Petroleum Co.

Natural gas conversion to petrochemicals, principally, benzene, naphthalene, toluene, as well as ethylene under non-oxidative conditions was examined in a fixed bed flow reactor at 700 ℃ and gaseous hourly space velocity （GHSV） of 1500 ml·g ^-1·h^-1 at time-on-stream ranging from 5 rain to 4 h using catalysts containing 6.0%Mo/H-ZSM-5 promoted with Pd or Ir metal. The catalysts were characterized by XRD, TPD, and TGA. The addition of Pd or Ir to 6%Mo/H-ZSM-5 catalyst promoted ethylene production but inhibited the cyclization reaction to aromatics owing to the strong interaction between these noble metals and the framework Al species, which were attached to the acid sites during the impregnation process. Coke deposition on the catalysts was found to decrease upon addition of 0.5wt% of Pd or Ir to 6%Mo/H-ZSM-5 catalyst owing to the hydrogenating activity of these metals.

关键词： natural gas methane benzene ethylene molybdenum Pd Ir H-ZSM-5

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Role of the injected water salinity and ion concentrations on the oil recovery in carbonate reservoirs

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Petroleum Research 2022年第3期7卷 394-400页

作者： M.Fouad Snosy Mahmoud Abu el ela Ahmed el-Banbi Helmy Sayyouh Petroleum Engineer General Petroleum CompanyEgypt Professor of Petroleum Engineering Cairo UniversityEgypt Professor of Petroleum Engineering The American University in CairoEgypt

Low salinity water flooding(LSWF)was initially considered using water with a low concentration of dissolved salts and was later extended to include modifying the ionic content of injected *** work investigates the effects of changing water salinity and composition along with the concentration of sulfate and iodide ions on oil recovery in carbonate reservoirs during the tertiary recovery *** experimental study was carried out using crude oil of 29°API,8 core samples extracted from the Eocene carbonate reservoir(Egypt),and 6 different water *** results showed additional oil recovery up to 5%of the original oil in place(OOIP)in the tertiary recovery stage with changing water salinity and water *** of high salinity(HS)and low salinity(LS)brines with high sulfate concentrations increased the incremental oil recovery by a value ranging from 1.7 to 3.8%of the *** the contrary,injection of HS and LS brines with low sulfate concentrations showed insignificant incremental oil recovery(less than 1%of the OOIP).Furthermore,injection of water with potassium iodide(KI)after injection of water with high sulfate brines showed additional oil recovery of about 1.7%of the *** the other hand,injection of water with KI after injection of water with low sulfate concentration showed insignificant incremental oil recovery(less than 0.4%of the OOIP).The concentration of sulfate in the injected water appeared to be key parameter to achieve effective waterflooding(WF)projects in carbonate ***,the results revealed that the multi-component ion exchange(MIE)mechanism seems to be the primary recovery mechanism for LSWF in carbonate *** results and conclusions of this study can be used to develop guidelines for designing waterflooding projects in carbonate reservoirs with optimum salinity.

关键词： Low salinity waterflooding Carbonate reservoirs Waterflooding LSWF

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Beta-endorphin in serum and seminal plasma in infertile men

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Asian Journal of Andrology 2006年第6期8卷 709-712页

作者： Shawky el-Haggar salah el-Ashmawy Ahmed Attia Taymour Mostafa M.M.Farid Roaiah Ashraf Fayez Sherif Ghazi Wael Zohdy Nagwa Roshdy Andrology Department Clinical Pathology Department Medical Biochemistry Department Faculty of MedicineCairo UniversityCairo 12311Egypt

Aim： To access beta-endorphin levels in serum as well as seminal plasma in different infertile male groups. Methods： Beta-endorphin was estimated in the serum and seminal plasma by enzyme-linked immunosorbent assay （elISA） method in 80 infertile men equally divided into four groups： non-obstructive azoospermia （NOA）, obstructive azoospermia （OA）, congenital bilateral absent vas deferens （CBVAD） and asthenozoospermia. The results were compared to those of 20 normozoospermic proven fertile men. Results： There was a decrease in the mean levels of betaendorphin in the seminal plasma of all successive infertile groups （mean ± SD： NOA 51.30 ± 27.37, OA 51.88 ± 9.47, CBAVD 20.36 ± 13.39, asthenozoospermia 49.26 ± 12.49 pg/mL, respectively） compared to the normozoospermic fertile control （87.23 ± 29.55 pg/mL）. This relation was not present in mean serum level of beta-endorphin between four infertile groups （51.09 ± 14.71, 49.76 ± 12.4, 33.96 ± 7.2, 69.1 ± 16.57 pg/mL, respectively） and the fertile control group （49.26 ± 31.32 pg/mL）. The CBVAD group showed the lowest seminal plasma mean level of beta-endorphin. Testicular contribution of seminal beta-endorphin was estimated to be approximately 40%. Seminal beta-endorphin showed significant correlation with the sperm concentration （r = 0.699, P = 0.0188） and nonsignificant correlation with its serum level （r = 0.375, P = 0.185） or with the sperm motility percentage （r = 0.470, P = 0.899）. Conclusion： The estimation of beta-endorphin alone is not conclusive to evaluate male reproduction as there are many other opiates acting at the hypothalamic pituitary gonadal axis.

关键词： azoospermia beta-endorphin male infertility opioid peptides semen seminal plasma

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