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Self-lubricating bidirectional carbon fiber reinforced smart aluminum composites by squeeze infiltration process

Journal of Materials Science & Technology 2019年第11期35卷 2559-2569页

作者： K.M.Sree Manu L.Ajay Raag T.P.D.Rajan B.C.Pai Vijay Petley shweta namd.o verma CSIR-National Institute for Interdisciplinary Science and Technology TrivandrumIndia Gas Turbine Research Establishment(GTRE) BangaloreIndia

Self-lubrication is one of the smart material properties required for producing components with enhanced wear resistance and low coefficient of ***(BD)satin weave polyacrylonitrile(PAN)based carbon fiber(Cf)fabric preform was successfully infiltrated with Al 6061 alloy by squeeze infiltration *** infiltrated composite shows uniform distribution of carbon fibers in the matrix with the elimination of porosities,fiber damage and close control on the formation of deleterious aluminum carbide(Al4C3)***/Al composite exhibits remarkable wear resistance compared to unreinforced alloy due to the formation of self-lubricating tribolayer on the pin surface,which intercepts the contact of matrix metal to counter *** BD carbon fiber enhanced the hardness and compressive strength of the composite by restraining the plastic flow behavior of *** resolution transmission electron microscopy shows the presence of Al2o3 and MgAl2o4 spinel,confirmed by EDS and SAD pattern,at the composite *** composite shows a lower density of 2.16 g/cm^3 which is a major ad vantage for weight reduction compared to the monolithic alloy(2.7 g/cm^3).

关键词： Metal matrix composites Squeeze infiltration Aluminum Carbon fiber fabric Tribology Microstructure

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Predictors of cerebrospinal fluid GeneXpert MTB/RIF positivity in patients with tuberculous meningitis:A prospective cohort study

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Asian Pacific Journal of Tropical Medicine 2024年第10期17卷 465-472页

作者： Priyanka Gupta Neeraj Kumar Ravindra Kumar Garg Hardeep Singh Malhotra Imran Rizvi Rajesh verma Praveen Kumar Sharma Ravi Uniyal shweta Pandey Amita Jain Parul Jain Department of Neurology King George’s Medical UniversityLucknowIndia Department of Microbiology King George’s Medical UniversityLucknowIndia

objective:To identify the clinical,laboratory,and radiological markers that could predict a positive GeneXpert result in patients suspected of tuberculous ***:In this prospective,observational study,patients with tuberculous meningitis were systematically *** clinical,laboratory[including cerebrospinal fluid(CSF)microscopy,culture,and GeneXpert],and neuroimaging factors were *** participants were administered anti-tuberculous treatment and corticosteroids.A six-month follow-up was done to evaluate the ***:of the 116 patients studied,54(46.6%)tested positive for GeneXpert,while 62(53.4%)were *** cranial nerve involvement(oR 3.71,95%CI 1.052-13.09,P=0.04)and the presence of basal exudates on neuroimaging(oR 5.22,95%CI 2.03-13.42,P=0.001)emerged as independent predictive factors for a positive GeneXpert result.A positive CSF GeneXpert result(P=0.002)and drug resistance(P=0.004)were significantly linked to adverse ***,a high score on the Medical Research Council stageⅢ(oR 5.64,95%CI 1.18-26.87,P=0.03)and elevated CSF cell counts(oR 1.002,95%CI 1.00-1.001,P=0.03)were identified as independent predictors of poor ***:Third cranial nerve involvement and the presence of basal exudates were significant indicators of a positive GeneXpert *** stageⅢdisability and elevated CSF cell counts predicted poor outcomes.

关键词： Tuberculous meningitis Mycobacterium tuberculosis Cerebrospinal fluid Ziehl-Neelsen staining GeneXpert

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