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mechanical properties of steel, glass, and hybrid fiber reinforced reactive powder concrete

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Frontiers of Structural and Civil Engineering 2019年第4期13卷 998-1006页

作者： Atheer H. m. ALGBURI m. Neaz SHEIKH muhammad N. S. HADI School of Civil Mining and Environmental Engineering University of Wollongong NSW 2522 Australia

This study examines the properties of fiber-reinforced reactive powder concrete (FR-RPC). Steel fibers, glass fibers, and steel-glass hybrid fibers were used to prepare the FR-RPC. The non-fibrous reactive powder concrete (NF-RPC) was prepared as a reference mix. The proportion of fibers by volume for all FR-RPC mixes was 1.5%. Steel fibers of 13 mm length and 0.2 mm diameter were used to prepare the steel fiber-reinforced RPC (SFR-RPC). Glass fibers of 13 mm length and 1.3 mm diameter were used to prepare the glass fiber-reinforced RPC (GFR-RPC). The hybrid fiber-reinforced RPC (HFR-RPC) was prepared by mixing 0.9% steel fibers and 0.6% glass fibers. Compressive strength, axial load-axial deformation behavior, modulus of elasticity, indirect tensile strength, and shear strength of the RPC mixes were investigated. The results showed that SFR-RPC achieved higher compressive strength, indirect tensile strength and shear strength than NF-RPC, GFR-RPC, and HFR-RPC. Although the compressive strengths of GFR-RPC and HFR-RPC were slightly lower than the compressive strength of NF-RPC, the shear strengths of GFR-RPC and HFR-RPC were higher than that of NF-RPC.

关键词： reactive powder concrete steel fiber glass fiber hybrid fiber

Acute hepatitis C:Prospects and challenges

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World Journal of Gastroenterology 2007年第48期13卷 6455-6457页

作者： Sanaa m Kamal Department of Gastroenterology and Liver Diseases Ain Shams University

more than 170 million people worldwide have chronic hepatitis C. Acute hepatitis C is rarely diagnosed because it is commonly asymptomatic. most infected patients are unaware of their condition until the symptoms of chronic infection manifest. Treatment of acute hepatitis C is something of a paradox because spontaneous resolution is possible and many patients do not have symptoms. However, several factors provide a rationale for treating patients who have acute hepatitis C. Compared with acute hepatitis C, chronic hepatitis C is associated with a worse prognosis, the need for more intensive treatment, longer treatment duration, and a decrease in successful treatment outcomes. Conversely, early intervention is associated with improved viral eradication, using a regimen that is better tolerated, less expensive, more convenient, and of shorter duration than the currently approved combination therapies for chronic hepatitis C.

关键词： Acute hepatitis C Therapy Pegylated interferon

RABL-regulated pathways： a new tale in sperm function

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Asian Journal of Andrology 2013年第1期15卷 87-88页

作者： Charles m Allan ANZAC Research Institute Concord Hospital Universityof Sydney Sydney NSW 2139 Australia

mammalian sperm have a specialized motile flagellum to provide the unidirectional propulsion required to achieve fertilisation of the egg. Defective flagella development and/or function is a significant cause of reduced sperm motility （asthenospermia） and male infertility. Over the past decade, a growing number of distinct proteins with crucial roles in sperm flagella have been identified by genetic loss-offunction approaches in mice, in which the deliberately engineered or spontaneous mutation of individual genes have lead to anomalies in sperm tail assembly,

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Fluoride distribution and the effect of some ions along Alexandria coastal mediterranean seawater of Egypt

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Journal of Environmental Sciences 2003年第5期15卷 639-646页

作者： W.m.El-Sarraf m.S.masoud A.A.Harfoush GH.F.El-Said NationalinstituteofOceanographyandFisheries ChemistryDepartmentChemistryDepartmentNationalInstituteofOceanographyandFisheries AlexandriaEgyptFacultyofScienceAlexandriaUniversityEgyptFacultyofScienceAlexandriaUniversityEgyptAlexandriaEgypt

The coastal seawater of mediterranean of Alexandria receives large amount of discharged waters containing industrial wastes, sewage, and agricultural and domestic drainage. Fluoride and some parameters were(chemical and physical) determined. The data gave indication that the content and the amount of the discharged water largely affect the chemical composition of the coastal water. Stepwise regression analysis was highly significant and the model was very fruitful, where the observed and calculated values were mostly concordant. This may indicated that there was a relation between fluoride content in coastal seawater and its content in the discharged water.

关键词： fluoride distibution Alexandria costal mediterranean Egypt physical and chemical parametrs regression analysis

Quaternary Ammonium-based Composite Particles for Antibacterial Finishing of Cotton-based Textiles

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Journal of materials Science & Technology 2014年第1期30卷 19-29页

作者： m.messaoud E.Chadeau P.Chaudouёt N.Oulahal m.Langlet LmGP(Grenoble Institute of Technology-minatec) LRGIA(Universit de Lyon Universit Lyon 1)

The antibacterial finishing of cotton-based fabrics has been achieved from quaternary ammonium-based composite particles. This functionalization is based on the simple dilution of a quaternary ammonium cation （QAC） hybrid alkoxide within a sol-gel derived crystalline suspension （CS） of TiO2 in liquid solution. This protocol yields the preparation of QAC-Ti02 （QT） composite sols by using a same CS over a long period of time, and enables an easy regeneration of derived QT sols after quite long aging periods. Composite sols can then be impregnated on various kinds of substrates, including textile fabrics. Fourier transform infrared spectroscopy studies, as well as optical and scanning electron microscopy observations, have been used to investigate chemical and morphological features arising from QT particles. Antibacterial tests have then been performed on so-finished textiles and are discussed in relation to chemical and morphological features. It is shown that this sol-gel route flexibly yields a similarly strong antibacterial activity on cotton-based fabrics against both Gram-negative and Gram-positive bacteria, Le. tested fabrics exhibit an antibacterial activity （a（~cording to the ISO 20743-2005 standard） ranging between 7.5 and 7.9 against both kinds of bacteria tested here. Finishing treatments also allow preserving the hand feeling and visual aspect of the textiles and promote a rather good attachment of impregnated particles on the surface of textile fibers.

关键词： Quaternary ammonium TiO2 Antibacterial efficiency Textile Sol-gel

The effect of swelling agent on the pore characteristics of mesoporous hydroxyapatite nanoparticles

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Progress in Natural Science:materials International 2015年第3期25卷 185-190页

作者： L.Bakhtiari J.Javadpour H.R.Rezaie m.Erfan m.A.Shokrgozar School of metallurgical and materials Engineering Iran University of Science and Technology School of Pharmacy Shahid Beheshti University of Medical Sciences National Cell Bank of Iran Pasteur Institute of Iran

The effect of swelling agent on the physicochemical properties of mesoporous hydroxyapatite particles synthesized by self-assembly process has been investigated. Cetyl trimethylammonium bromide(CTAB) and 1-dodecanethiol were used as soft template and swelling agent respectively. The results of the field emission scanning electron microscopy(FESEm), X-ray diffraction(XRD), simultaneous thermal analysis(STA), Brunauer-Emmett-Teller(BET) surface area, small-angle X-ray diffraction and Fourier transform infrared spectroscopy(FTIR)assessments revealed that in the case of low concentration, 1-dodecanethiol performed as swelling agent and caused an increase in the pore size. However, at higher concentrations it led to the formation of microemulsion and foamy structures. The optimum swelling agent: surfactant mass ratio in synthesis of mesoporous hydroxyapatite particles with high pore volume was determined to be around 2.1 in this study.

关键词： mesopore Hydroxyapatite Nanoparticle Swelling agent Pore characteristics

Validation of adherence prediction system for lifestyle interventions in nonalcoholic fatty liver disease

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World Journal of Gastroenterology 2024年第20期30卷 2629-2632页

作者： meer m Chisthi Department of General Surgery Government Medical College PathanamthittaKonni 689691KeralaIndia

This editorial delves into the research article by Zeng et al published in the latest issue of World Journal of *** manuscript contributes significantly to addressing the global health issue of nonalcoholic fatty liver disease(NAFLD)by introducing and validating the Exercise and Diet Adherence Scale(EDAS).The article effectively conveys the importance of the study,highlighting the prevalence of NAFLD,the lack of approved drugs for its treatment,and the crucial role of lifestyle *** use of the Delphi method for scale development and the subsequent evaluation of its reliability add scientific rigor to the *** results demonstrate that the scale is correlated with key lifestyle indicators,which makes it a promising tool for assessing patient adherence to *** identification of specific score thresholds for predicting adherence to daily calorie intake and exercise adds practical value to the *** differentiation among scores indicative of good,average,and poor adherence enhances its clinical *** conclusion,the manuscript introduces EDAS,a valuable instrument that can contribute substantially to the field of NAFLD research and clinical practice.

关键词： Nonalcoholic fatty liver disease Lifestyle interventions Adherence assessment Exercise and Diet Adherence Scale Delphi method

High Temperature Creep and Superplasticity in a mg-Zn-Zr Alloy

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Journal of materials Science & Technology 2012年第5期28卷 407-413页

作者： S. Spigarelli m. El mehtedi m. Regev E. Gariboldi N. Lecis Dipartimento di Ingegneria Industriale e Scienze matematiche Universit Politecnica delle Marche Via Brecce Bianche Ancona 60131 Italy mechanical Engineering Dept. ORT Braude College Karmiel 21982 Israel Dipartimento di meccanica Politecnico di Milano via La Masa 34 20156 Milano Italy

Creep and superplasticity were investigated by testing a fine-grained extruded mg–Zn–Zr magnesium alloy under a wide range of applied stress in the temperature range between 100 and 300 ℃. Grain boundary sliding became the dominating mechanism at 200 ℃, leading to a true superplastic behaviour at 300 ℃, where superplasticity was attained even under relatively high strain rates （5×10-3 s-1 ）. By contrast, for lower temperatures, the straining process was controlled by dislocation climb. A comprehensive model, taking into account the simultaneous operation of the different mechanisms, was developed to describe the strain rate dependence on applied stress.

关键词： Creep Superplasticity magnesium alloy

Do we need a new levodopa?

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Neural Regeneration Research 2016年第5期11卷 731-732页

作者： Thomas müller Department of Neurology St.Joseph Hospital Berlin-Wei?ensee

Idiopathic Parkinson＇s disease（PD）is classified as a chronic progressive neurodegenerative *** each other complementing,still hypothetical aetiologies describe the predominant dopaminergic neuronal *** include gene... 详细信息

关键词： RGma COmT Do we need a new levodopa PLP GSH