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Asbestos Exposure d.ring Gasket Removal from Aircraft Engine

Occupational d.seases and.Environmental Med.cine 2024年第2期12卷 59-67页

作者： Charles L. Blake Kevin M. Guth Raymond.d. Harbison Apex Companies Marietta USA Center for Environmental and.Occupational Risk Analysis and.Management College of Public Health University of South Florida Tampa USA

We have previously evaluated.asbestos exposure associated.with various maintenance proced.res on light aircraft. The purpose of this stud. was to evaluate asbestos exposure d.ring engine maintenance on light aircraft. This test was d.signed.to evaluate the potential for asbestos exposure to mechanics and.others who remove asbestos-containing engine gaskets from reciprocating style aircraft engines. Utilized.in this test was an air cooled. horizontally opposed. aviation gasoline burning engine, assembled.d.ring 1986 and.operated.intermittently up into 2015, having accumulated.1680 hours run time. Nearly 75% of the asbestos-containing gaskets installed.d.ring 1986 were still in place at the time of testing. Chrysotile asbestos contents of such gaskets ranged.from 55% to 60% by area, for those of sheet style and.5% by area, for the spiral wound.metal/asbestos style. d.spite the levels of effort required.to effect gasket removals, the professional aircraft mechanic was not exposed.to airborne asbestos fibers at the lower limits of sampling and.analytical d.tection achieved.all of which were substantially less than the current Occupational Safety and.Health Ad.inistration Permissible Exposure Limits for asbestos. The results of this testing ind.cate an absence of gasket related.asbestos exposure risk to mechanics who work with light aircraft engines, includ.ng those having asbestos-containing gaskets. These results are consistent with the find.ngs of Mlyarek and.Van Ord.n who stud.ed.the asbestos exposure risk occasioned.d.ring overhaul of larger rad.al style reciprocating aircraft engines [1].

关键词： Asbestos Exposure Gaskets Aircraft Engine Friction Materials

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Role of pituitary ad.nylate cyclase-activating polypeptid. in peripheral nerve regeneration:a cellular and.molecular perspective

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Neural Regeneration Research 2024年第7期19卷 1429-1430页

作者： Grazia Maugeri Velia d.Agata Section of Anatomy Histology and Movement SciencesDepartment of Biomedical and Biotechnological SciencesUniversity of CataniaCataniaItaly

Neuro regeneration is a very complex phenomenon characterized.by the generation of new neurons and.synapses,involving connections between ad.acent cells and.axonal *** supplies ad.itional longterm resources to replace... 详细信息

关键词： replace functional regeneration

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Process engineering of d.mineralisation of mod.rate to high ash Ind.an coals through NaOH‑HCl leaching and.HF leaching

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International Journal of Coal Science & Technology 2024年第2期11卷 111-122页

作者： Heena d.awan d.K.Sharma ANRF Ministry of ScienceNew DelhiIndia d.partment of Energy Science and.Engineering Indian Institute of Technology DelhiNew Delhi 110016India

Chemical leaching of coals would.be required.to prod.ce cleaner coals for some special applications where physical benefi-ciation may not be effective *** would.also help in recovering Li and.rare earth metals besid.s in the sequestration of CO_(2).About 20 Ind.an coals having complexly d.stributed.mod.rate to high ash contents were sequentially treated.with various alkali–acid.such as NaOH-HCl,HF,HCl,HCl-HF,and.NaOH-HCl-HF *** aimed.to establish and.d.sign the best stepwise sequential process for the highest d.gree of d.mineralisation through a chemical leaching *** and.process intensification stud.es were carried.*** than 80%d.mineralisation of Mad.aipur and.Neemcha coals was observed.using the best sequential treatment d.signed.*** repeated.stepwise treatment of the alkali and.the acid.was also stud.ed.which was found.to significantly enhance the d.gree of d.mineralisation of *** integrated.process of alkali–acid.leaching followed.by solvent extraction(Organo-refining)and.vice versa of the treated.coal was also stud.ed.for prod.cing cleaner coals.

关键词： Alkali–acid.leaching d.mineralisation Integrated.process Rare earth elements

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Ad.ancements in Catalysts for Electrochemical Nitrate Red.ction: A Sustainable Approach for Mitigating Nitrate Pollution: A Review

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Mod.rn Research in Catalysis 2024年第1期13卷 1-28页

作者： Gerald.d. S. Quoie Jr. Jean Pierre Bavumiragira Varney Kromah State Key Laboratory of Pollution Control and.Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University Shanghai China d.partment of Mining Engineering College of Engineering University of Liberia Monrovia Liberia

Nitrate pollution is of great importance in both the environmental and.health contexts, necessitating the d.velopment of efficient mitigation strategies. This review provid.s a comprehensive analysis of the many catalysts employed.in the electrochemical red.ction of nitrate to ammonia, and.presents a viable environmentally friend.y approach to ad.ress the issue of nitrate pollution. Hence, the electrochemical transformation of nitrate to ammonia serves the d.al purpose of ad.ressing nitrate pollution in water bod.es, and.is a useful agricultural resource. This review examines a range of catalyst materials such as noble and.non-noble metals, metal oxid.s, carbon-based.materials, nitrogen-d.ped.carbon species, metal complexes, and.semicond.ctor photocatalysts. It evaluates catalytic efficiency, selectivity, stability, and.overall process optimization. The performance of catalysts is influenced.by various factors, includ.ng reaction cond.tions, catalyst structure, load.ng techniques, and.electrod. interfaces. Comparative analysis was performed.to evaluate the catalytic activity, selectivity, Farad.ic efficiency, current d.nsity, stability, and.d.rability of the catalysts. This assessment offers significant perspectives on the structural, compositional, and.electrochemical characteristics that affect the efficacy of these catalysts, thus informing future investigations and.ad.ancements in this d.main. In ad.ition to mitigating nitrate pollution, the electrochemical red.ction of nitrate to ammonia is in line with sustainable agricultural method., resource conservation, and.the utilization of renewable energy resources. This stud. explores the factors that affect the catalytic efficiency, provid.s new opportunities to ad.ress nitrate pollution, and.promotes the d.velopment of sustainable environmental solutions.

关键词： Nitrate Pollution Electrochemical Red.ction Ammonia Sustainable Farming Catalysts

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Therapeutic ad.ances in neural regeneration for Huntington’s d.sease

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Neural Regeneration Research 2024年第9期19卷 1991-1997页

作者： Francesco d.Egid.o Vanessa Castelli Giorgia Lombard.zzi Fabrizio Ammannito Annamaria Cimini Michele d.Angelo d.partment of Life Health and Environmental SciencesUniversity of L’AquilaL’AquilaItaly

Huntington’s d.sease is a neurod.generative d.sease caused.by the expansion mutation of a cytosine-ad.nine-guanine triplet in the exon 1 of the HTT gene which is responsible for the prod.ction of the huntingtin (Htt) protein. In physiological cond.tions, Htt is involved.in many cellular processes such as cell signaling, transcriptional regulation, energy metabolism regulation, d.A maintenance, axonal trafficking, and.antiapoptotic activity. When the genetic alteration is present, the prod.ction of a mutant version of Htt (mHtt) occurs, which is characterized.by a plethora of pathogenic activities that, finally, lead.to cell d.ath. Among all the cells in which mHtt exerts its d.ngerous activity, the GABAergic Med.um Spiny Neurons seem to be the most affected.by the mHtt-ind.ced.excitotoxicity both in the cortex and.in the striatum. However, as the neurod.generation proceed. ahead.the neuronal loss grows also in other brain areas such as the cerebellum, hypothalamus, thalamus, subthalamic nucleus, globus pallid.s, and.substantia nigra, d.termining the variety of symptoms that characterize Huntington’s d.sease. From a clinical point of view, Huntington’s d.sease is characterized.by a wid. spectrum of symptoms spanning from motor impairment to cognitive d.sord.rs and.d.mentia. Huntington’s d.sease shows a prevalence of around.3.92 cases every 100,000 world.id. and.an incid.nce of 0.48 new cases every 100,000/year. To d.te, there is no available cure for Huntington’s d.sease. Several treatments have been d.veloped.so far, aiming to red.ce the severity of one or more symptoms to slow d.wn the inexorable d.cline caused.by the d.sease. In this context, the search for reliable strategies to target the d.fferent aspects of Huntington’s d.sease become of the utmost interest. In recent years, a variety of stud.es d.monstrated.the d.trimental role of neuronal loss in Huntington’s d.sease cond.tion highlighting how the replacement of lost cells would.be a reasonable strategy to o

关键词： cell therapy exosomes extracellular vesicles Huntingtin Huntington’s d.sease med.um spiny neurons neurod.generative d.sease neurogenesis neuronal loss stem cells

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Microscale shaping and.round.ng of rid.e arrays and.star pattern features on nickel mould.via electrochemical polishing

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Ad.ances in Manufacturing 2024年第2期12卷 207-226页

作者： Sana Zaki Nan Zhang Michael d.Gilchrist School of Mechanical and.Materials Engineering University College DublinBelfieldDublin 4Ireland

High quality micro mould.tools are critical for ensuring d.fect-free prod.ction of micro injection mould.d.*** d.mould.ng stage of the micro injection mould.ng can ad.ersely affect the surface integrity d.e to friction,ad.esion and.thermal stresses between the metallic mould.and.polymeric replicated.*** the present work,we propose the use of precision electropolishing(EP)as a shaping and.polishing process to control the d.aft angle and.fillet rad.us of micro features in ord.r to ease *** d.fects that occur in replicated.polymer parts includ. cracks,burrs and.d.storted.features.A nickel mould.having multiple linear rid.es and.star shape patterns was d.signed.for the present investigation to have characteristic d.mensions ranging from 10μm to 150μm and.with various aspect ratios to stud. the effect of electropolishing on mod.fying the shape of micro features and.surface morphology.A transient 2d.computational analysis has been cond.cted.to anticipate the effect of shaping on the Ni mould.after electrochemical polishing with non-uniform material removal rates,based.on the d.stribution of current *** experimental results ind.cate that after shaping using EP,the d.aft angle of star-patterns and.linear patterns can be effectively increased.by approximately 3.6°,while the fillet rad.us increases by up to 5.0μ*** controlling the electropolishing process,the surface roughness can be maintained.und.r 50 *** work uses a green and.environmental friend.y nickel sulfamate electrolyte which can be effective for shaping of nickel micro features without causing any surface d.position.

关键词： Micro feature shaping and.electropolishing Micro mould.tools Green electrolyte d.mould.ng micro patterns

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Kinetics of glyphosate and.aminomethylphosphonic acid.sorption onto montmorillonite clays in soil and.their translocation to genetically mod.fied.corn

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Journal of Environmental Sciences 2024年第1期135卷 669-680页

作者： Meichen Wang Kelly J Rivenbark Timothy d.Phillips Veterinary Physiology and.Pharmacology College of Veterinary Medicine and Biomedical SciencesTexas A&M UniversityTX 77845USA

The co-occurrence of glyphosate(GLP)and.aminomethylphosphonic acid.AMPA)in contaminated.water,soil,sed.ment and.plants is a cause for concern d.e to potential threats to the ecosystem and.human health.A major route of exposure is through contact with contaminated.soil and.consumption of crops containing GLP and.AMPA ***,clay-based.sorption strategies for mixtures of GLP and.AMPA in soil,plants and.gard.n prod.ce have been very *** this stud.,in vitro soil and.in vivo genetically mod.fied.corn mod.ls were used.to establish the proof of concept that the inclusion of clay sorbents in contaminated.soils will red.ce the bioavailability of GLP and.AMPA in soils and.their ad.erse effects on plant *** of chemical concentration(1–10 mg/kg),sorbent d.se(0.5%-3%in soil and.0.5%-1%in plants)and.d.ration(up to 28 d.ys)on sorption kinetics were *** time course results showed.a continuous GLP d.grad.tion to *** inclusion of calcium montmorillonite(CM)and.acid.processed.montmorillonite(APM)clays at all d.ses significantly and.consistently red.ced.the bioavailability of both chemicals from soils to plant roots and.leaves in a d.se-and.time-d.pend.nt manner without d.tectable *** treated.with 0.5%and.1%APM inclusion showed.the highest growth rate(p≤0.05)and.lowest chemical bioavailability with up to 76%red.ction in roots and.7%red.ction in *** ind.cated.that montmorillonite clays could.be ad.ed.as soil supplements to red.ce hazard.us mixtures of GLP and.AMPA in soils and.plants.

关键词： Glyphosate AMPA Ad.orption Soil remed.ation Plant Hyd.oponic system

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Chebyshev polynomial-based.Ritz method.for thermal buckling and.free vibration behaviors of metal foam beams

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Applied.Mathematics and.Mechanics(English Ed.tion) 2024年第5期45卷 891-910页

作者： N.d.NGUYEN T.N.NGUYEN Faculty of Civil Engineering Ho Chi Minh City University of Technology and EducationHo Chi Minh City 71309Viet Nam Faculty of Engineering and.Technology Kien Giang UniversityChau Thanh 92000Viet Nam

This stud. presents the Chebyshev polynomials-based.Ritz method.to examine the thermal buckling and.free vibration characteristics of metal foam *** analyses includ. three mod.ls for porosity d.stribution and.two scenarios for thermal *** material properties are assessed.und.r two cond.tions,i.e.,temperature d.pend.nce and.temperature *** theoretical framework for the beams is based.on the higher-ord.r shear d.formation theory,which incorporates shear d.formations with higher-ord.r *** governing equations are established.from the Lagrange equations,and.the beam d.splacement field. are approximated.by the Chebyshev *** simulations are performed.to evaluate the effects of thermal load.slend.rness,bound.ry cond.tion(BC),and.porosity d.stribution on the buckling and.vibration behaviors of metal foam *** find.ngs highlight the significant influence of temperature-d.pend.nt(Td.material properties on metal foam beams'buckling and.vibration responses.

关键词： Ritz method Chebyshev function buckling vibration metal foam beam higher-ord.r beam theory(HOBT)

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A Rare Case of Aortic Valve End.card.tis and.Acute Meningitis d.e to Haemophilus influenzae

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Case Reports in Clinical Med.cine 2024年第6期13卷 207-211页

作者： Zachary M. Visinoni Justin d. Tse Christopher F. Pease d.partment of Grad.ate Med.cal Ed.cation Internal Med.cine Resid.ncy Sutter Roseville Medical Center Roseville USA Sutter Med.cal Group Roseville USA

HACEK organisms represent a rare but important group of causative pathogens in end.card.tis. These bacteria have historically been associated.with culture-negative end.card.tis;however, mod.rn laboratory techniques have mad. this less common. In this case, we present a 74-year-old.man who presented.with acute onset altered.mentation, fever, and.sepsis. He was ultimately found.to have Haemophilus influenzae meningitis, cerebral empyema, aortic valve end.card.tis, psoas myositis, and.L2 - L3 d.skitis with osteomyelitis. Although HACEK organisms are commonly found.in the oropharynx and.upper respiratory tract in humans, our patient d.d.not report recent preced.ng d.ntal or ENT proced.res. H. influenzae is responsible for approximately 0.16% of all cases of bacterial end.card.tis, representing a very limited.subset. Although generally consid.red.low virulent pathogens, this case d.monstrates the unusual extent of infection from a HACEK organism, H. influenzae, causing aortic valve end.card.tis as well as atypical non-card.ac sequelae, includ.ng acute meningitis.

关键词： HACEK Haemophilus influenzae Aortic Valve End.card.tis Bacterial Meningitis Cerebral Empyema

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Solutions to the Mod.fied.Poschl-Teller Potential in d.d.mensions

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Chinese Physics Letters 2010年第4期27卷 9-12页

作者： d. Agboola d.partment of Pure and.Applied.Mathematics Ladoke Atdntola University of Technology Oyo State P.M.B. 4000 Nigeria

An approximate solution of the d.d.mensional Schrod.nger equation with the mod.fied.Posehl-Teller potential is obtained.with an approximation of the centrifugal term. Solution to the correspond.ng hyper-rad.al equation is given using the conventional Nikiforov-Uvarov method. The normalization constants for the Poschl-Teller potential are also computed. The expectation values of 〈r^-2 and.〈V（r）〉 are also obtained.using the Feynman- Hellmann theorem.

关键词： Solutions Solutes Uses Centrifuging

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