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Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount, and size of nanoparticle reinforcements

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Friction 2019年第4期7卷 340-350页

作者： Aleksandar VENCL Ilija BOBIC Biljana BOBIC Kristina JAKIMOVSKA Petr SVOBODA mara KANDEVA Faculty of Mechanical Engineering University of BelgradeKraljice Marije 16Belgrade 11120Serbia Institute of Nuclear Sciences'Vinca' University of BelgradeMike Petrovica Alasa 12-14Belgrade 11001Serbia Institute of Chemistry Technology and MetallurgyUniversity of BelgradeNjegoseva 12Belgrade 11000Serbia Faculty of Mechanical Engineering in Skopje Ss.Cyril and Methodius UniversityKarposh II bbSkopje 1000Macedonia Faculty of Mechanical Engineering Brno University of TechnologyTechnicka2896/2Brno 61669Czech Republic Faculty of Industrial Technology Technical University of Sofia8 Kliment Ohridski BlvdSofia 1000Bulgaria

Metal matrix nanocomposites(MMnCs)comprise a metal matrix filled with nanosized reinforcements with physical and mechanical properties that are very different from those of the *** ZA-27 alloy-based nanocomposites,the metal matrix provides ductility and toughness,while usually used ceramic reinforcements give high strength and *** ZA-27 alloy-based nanocomposites,reinforced with different types(Si C and Al2O3),amounts(0.2 wt.%,0.3 wt.%,and 0.5 wt.%)and sizes(25 nm,50 nm,and 100 nm)of nanoparticles were produced through the compocasting process with mechanical alloying pre-processing(ball milling).It was previously shown that the presence of nanoparticles in ZA-27 alloy-based nanocomposites led to the formation of a finer structure in the nanocomposites matrix and an improvement in the basic mechanical properties(hardness and compressive yield strength)through the enhanced dislocation density strengthening *** particle erosive wear testing demonstrated that these improvements were followed with an increase in the erosive wear resistance of tested nanocomposites,as ***,by analyzing the influences of type,amount,and size of nanoparticles on the erosive wear resistance of nanocomposites,it was demonstrated that there is an optimal amount of nanoparticles,which in our case is 0.3 wt.%,and that the presence of SiC nanoparticles and smaller nanoparticles in nanocomposites had more beneficial influence on erosive wear resistance.

关键词： ZA-27 alloy nanocomposites nanoparticles compocasting fractography erosive wear

Tailoring the partitioning of proteins using ionic liquids as adjuvants in polymer-polymer aqueous biphasic systems

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Green Chemical Engineering 2022年第4期3卷 328-337页

作者： Flavia F.Magalhaes Matheus M.Pereira Rita de Cassia Superbi de Sousa Ana P.M.Tavares Joao A.P.Coutinho mara G.Freire CICECO-Aveiro Institute of Materials Department of ChemistryUniversity of AveiroAveiro3810-193Portugal Separation Process Laboratory(LPS) Department of Food TechnologyFederal University of Viçosa(UFV)P.H.Rolfs Av.s/n36570-000 ViçosaMGBrazil

Aqueous biphasic systems(ABS)are promising for proteins purification;however,when dealing with samples comprising several proteins,the selectivity towards a target protein is difficult to *** this work,the addition of ionic liquids(ILs)as adjuvants(5 wt%and 10 wt%)in ABS composed of polyethylene glycol(PEG)and dextran was investigated to tailor proteins partitioning between the coexisting *** liquid-liquid phase diagrams were determined at 298 K,followed by partition studies of three proteins(bovine serum albumin(BSA),immunoglobulin G(IgG),and cytochrome C(Cyt C)).Partition coefficients of IgG and BSA indicate the preference of both proteins to the dextran-rich phase,whereas Cyt C has no preferential partitioning between the *** addition of chloride-based ILs as adjuvants allows to increase or decrease the partition coefficients,thus tailoring the proteins partitioning between the *** partitioning essentially depends on the IL content in each phase,whereas Cyt C and IgG partitioning is ruled by the ILs chemical structure and established *** docking was carried out to address the ILs effect on the proteins partitioning,supporting experimental observations,while identifying the specific interactions *** partition of each protein in polymer-salt ABS with ILs as adjuvants was determined,demonstrating the higher tailoring ability of polymer-polymer ABS when adding ***,the partition of each protein in presence of the remaining ones was determined,as well as the selectivity of the studied systems to separate each pair of proteins,paving the way for their use in liquidliquid chromatography.

关键词： Aqueous biphasic systems Polymer-polymer systems Protein partition Ionic liquids Adjuvants

New Clues that May Link Osteoporosis to the Circulating Lipid Profile

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Bone Research 2013年第3期1卷 260-266页

作者： Catalina Poiana Valentin Radoi mara Carsote John P. Bilezikian "C. I. Parhon" National Institute of Endocrinology Bucharest Bucharest Romania University of Medicine and Pharmacy"Carol Davila" Bucharest Bucharest Romania College of Physicians and Surgeons Columbia UniversityNew York NY USA

Bone Mineral Density （BMD） is a gold standard for the diagnosis of osteoporosis and is also important in the assessment of fracture risk. Other risk factors have been identified that together make up fracture risk assessment tools such as FRAX. Another potential factor, circulating lipids, has been suggested because of reports linking statins to fracture risk reduction. We analyzed the lipid profile in a cohort of women diagnosed with postmenopausal osteoporosis based on bone density determination： 610 women with osteo- porosis （mean lumbar spine T-score -3.16±0.81, mean yrs. since menopause 15.79±8.9） were grouped according to age at evaluation （〈 50 years, 51-60 years, 61-70 years, 〉 70 years）, the presence/absence of a history of a fragility fracture, statin and/or antiresorptive drug use. There was no correlation between BMD and Body Mass Index （BMI： P〉0.05, r2〈0.02）. However, when BMD was correlated with both BMI and the lipid profile （Triglycerides, Cholesterol, LDLc, HDLc）, significant correlations were found in 5 cohorts： 51-60 years with fractures （n=61, r2=0.14, P〈0.01）, 61-70 years （n=201, r2=0.09, P〈0.01） with fractures （n=88, r2=0.14, P〈0.01） or without fractures （n=113, r2=0.24, P=0.02） and over 70 years （n=247, r2=0.11, P〈0.01）.

关键词： osteoporosis bone mineral density lipid cholesterol triglycerides HDL-cholesterol

Current policies in Brazil for ensuring nutritional quality

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Food Quality and Safety 2017年第4期1卷 275-288页

作者： Jane mara Block Adriana Pavesi Arisseto-Bragotto Maria Manuela Camino Feltes Department of Food Science and Technology Federal University of Santa Catarina-UFSCFlorianópolis Department of Food Science State University of Campinas-UNICAMPRua Monteiro LobatoCampinasSão PauloBrazil

Objectives:In this work the current policies and regulatory actions of the government agencies in Brazil for ensuring nutritional quality are *** and methods:Information on the efforts of industry,academia and nongovernmental organizations to achieve the proposed goals,the results achieved and the challenges that must still be faced by the different sectors of the Brazilian society are presented and ***:The joint action of regulatory agencies,the food production sector,non-governmental entities and academia resulted in the reduction of saturated and trans fats,salt and sugar in foods produced in ***:Most of the information related to the food industries in Brazil is made available by ABIA(Brazilian Association of Food Industries)which represents around 60%of the food market in *** regarding the rest of the market is ***:The reduction of saturated and‘trans’fats,sodium,and sugar in industrialized foods seems an effective strategy for reducing the intake of these compounds by the Brazilian *** addition the adequate nutrition labeling and consumer education will allow healthier food choices by the population.

关键词： Brazilian food industry healthy foods ‘trans’fats salt sugar

Food quality and safety progress in the Brazilian food and beverage industry:chemical hazards

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Food Quality and Safety 2017年第2期1卷 117-129页

作者： Adriana Pavesi Arisseto-Bragotto Maria Manuela Camino Feltes Jane mara Block Department of Food Science State University of Campinas-UNICAMPRua Monteiro LobatoCampinas-SPBrazil Department of Food Science and Technology Federal University of Santa Catarina-UFSCRod.Admar GonzagaFlorianópolis-SCBrazil

INTRODUCTION:Ensuring food safety is a challenge for developed and developing countries and depends on the combined efforts of government,regulators,academia,consumers,food producers,and ***:In this work,an overview of the main regulatory aspects related to chemical hazards in the Brazilian food and beverage industry is *** presence of contaminants,food additives,and residues of pesticides and veterinary drugs,including current regulations and their impacts on the safety and quality of locally produced foods,are ***:In Brazil,the assessment,management,and communication of human health risks in food and beverage are the joint responsibility of the Ministry of Health and the Ministry of Agriculture,Livestock and Food Supply,which enforce the international regulations established mainly by the Codex Alimentarius Commission,the European Commission,and the US Food and Drug ***:Constant updates of the national legislation following internationally recognized standards,the intensification of the existing monitoring plans and efficient actions of sanitary surveillance,major investments in scientific research,and a greater awareness among the food producers may contribute to the safety and quality of the food produced in Brazil.

关键词： Food safety Regulation Food and beverage Industry Health risks Chemical contamination.

Food quality,food-borne diseases,and food safety in the Brazilian food industry

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Food Quality and Safety 2017年第1期1卷 13-27页

作者： Maria Manuela Camino Feltes Adriana Pavesi Arisseto-Bragotto Jane mara Block Department of Food Science and Technology Federal University of Santa CatarinaRod.Admar GonzagaItacorubiFlorianópolisBrazil Department of Food Science State University of CampinasRua Monteiro LobatoSão PauloBrazil

INTRODUCTION:In the recent decades,a global effort from food suppliers,industries,and governments has ensured that food production would meet the high quality required by the sanitary authorities,minimizing public health implications and economic losses caused by food-borne ***:Several programmes and initiatives have been developed worldwide both by government agencies and the private sector to achieve this ***-borne diseases,caused by pathogens,natural toxins,and chemical contaminants,remain a global public health challenge,since new threats are continuously emerging while others are being ***,in many countries,the consumption of food prepared outside the home increases the exposure to the risks posed by poor hygiene in food *** this context,a reliable sanitary surveillance system is urgently needed to identify potential hazards,conduct risk analysis,and control food-borne diseases outbreaks *** SAFETY POLICIES AND REGULATORY FRAMEWORKS:Brazil national agencies are tasked with controlling the hazards in the food chain by means of federal regulations based on a set of global sanitary authorities’***:The occurrence of food-borne diseases,control measures,policies,and regulatory frameworks in Brazil drawn to ensure the quality and safety of food are presented in this paper.

关键词： Brazilian food regulation Food policies Public health Food safety

Low-cost disordered carbons for Li/S batteries： A high- performance carbon with dual porosity derived from cherry pits

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Nano Research 2018年第1期11卷 89-100页

作者： Celia Hernandez-Rentero Rafael Cordoba Noelia Moreno Alvaro Caballero Julian Morales mara Olivares-Marin Vicente Gomez-Serrano Dpto. Ouimica Inorgdnica e Ingenierfa Quimica Instituto de Quimica Fina y Nanoqufmica Universidad de C6rdoba 14071 C6rdoba Spain Dpto. Quimica Inorg6nica Facultad de Ciencias Universidad de Extremadura 06006 Badajoz Spain

A micro- and mesoporous carbon obtained from cherry pit waste and activated with HBPO4 acid has been studied as the sulfur host for Li/S batteries. The carbon has a high specific surface area of 1,662 m2·g-1 （SBET） and micropore and mesopore volumes of 0.57 and 0.40 cm3·g-1, respectively. The S/C composite, with a sulfur content of 57% deposited by the disproportionate reaction of a SaO2- solution in an acid medium without an additional heating step above the S melting point, delivers an initial specific capacity of 1,148 mah·g-1 at a current of C/16. It also has a high capacity retention of 915 mAh·g-1 after 100 cycles and a Coulombic efficiency close to 100%. The good performance of the composite was also observed under higher current rates and long-term cycling tests. The capacities delivered by the cell after 200 cycles were 707 and 410 mAh·g-1 at C/2 and 1C （1C = 1,675 mA·g-1）, respectively, maintaining the high Coulombic efficiency. The overall electrochemical response of this carbon as the sulfur matrix is among the best reported so far among the other biomass-derived carbons, probably because of the micro- and mesopore system formed upon activation.

关键词： activated carbon agricultural waste cherry stone sulfur composite lithium-sulfur batteries

State of the Art on Micromilling of Materials,a Review

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Journal of Materials Science & Technology 2012年第8期28卷 673-685页

作者： M.A.Cmara J.C. Campos Rubio A.M. Abro J.P. Davim Department of Mechanical Engineering Universidade Federal de Minas GeraisAv.Ant onio Carlos6627-Pampulha Belo Horizonte MGCEP:31.270-901Brazil Department of Mechanical Engineering University of AveiroCampus Universitrio de Santiago3810-193AveiroPortugal

The trend towards miniaturization has increased dramatically over the last decade, especially within the fields concerned with bioengineering, microelectronics, and aerospace. Micromillin8 is among the principal manu- facturing processes which have allowed the development of components possessing micrometric dimensions, being used to the manufacture of both forming tools and the final product. The aim of this work is to present the principal aspects related to this technology, with emphasis on the work material requirements, tool ma- terials and geometry, cutting forces and temperature, quality of the finished product, process modelling and monitoring and machine tool requirements. It can be noticed that size effect possesses a relevant role with regard to the selection of both work material （grain size） and tooling （edge radius）. Low forces and temper- ature are recorded during micromillin8, however, the specific cutting force may reach high values because of the ploughing effect observed as the uncut chip thickness is reduced. Finally, burr formation is the principal concern with regard to the quality of the finished part.

关键词： Micro-milling Micromachining Size effect Miniaturization

Hepatocellular carcinoma and microbiota:Implications for clinical management and treatment

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World Journal of Hepatology 2022年第7期14卷 1319-1332页

作者： Dario Spanu Andrea Pretta Eleonora Lai mara Persano Clelia Donisi Stefano Mariani Marco Dubois Marco Migliari Giorgio Saba Pina Ziranu Valeria Pusceddu Marco Puzzoni Giorgio Astara Mario Scartozzi Medical Oncology Unit University Hospital and University of CagliariMonserrato 09042CagliariItaly

Gut microbiota plays an essential role in host *** is involved in several physiological processes such as nutrients digestion and absorption,maintenance of intestinal epithelial barrier integrity and immune system *** the gut microbiota is assumed to play a crucial role in many gastrointestinal,pancreatic and liver *** role in hepatic carcinogenesis is also gaining increasing interest,especially regarding the development of therapeutic *** studies are highlighting a link between some bacterial strains and liver disease,including hepatocellular carcinoma(HCC).Indeed,HCC represents an interesting field of research in this perspective,due to the gut-liver axis,to the implication of microbiota in the immune system and to the increasing number of immunotherapy agents investigated in this ***,the assessment of the role of microbiota in influencing clinical outcome for patients treated with these drugs is becoming of increasing *** review aims to give an overview on the relationship between microbiota and HCC development/progression and *** focus on potential implications on the available treatment strategies and those under study in the various stages of *** highlight the pathogenic mechanisms and investigate the underlying molecular pathways ***,we investigate the potential prognostic and/or predictive role of microbiota for target therapies,immune checkpoint inhibitors and loco-regional ***,given the limitation of current treatments,we analyze the gut microbiota-mediated therapies and its potential options for HCC treatment focusing on fecal microbiota transplantation.

关键词： Hepatocellular carcinoma Gut microbiota Gut-liver axis Fecal microbiota transplantation Carcinogenesis Immune checkpoint inhibitors