89 results match your criteria traditional vickers


Sustainable Additive Manufacturing: Mechanical Response of Polyethylene Terephthalate Glycol over Multiple Recycling Processes.

Materials (Basel) 2021 Mar 2;14(5). Epub 2021 Mar 2.

Mechanical Engineering Department, Hellenic Mediterranean University, 71410 Heraklion, Greece.

The continuous demand for thermoplastic polymers in a great variety of applications, combined with an urgent need to minimize the quantity of waste for a balanced energy-from-waste strategy, has led to increasing scientific interest in developing new recycling processes for plastic products. Glycol-modified polyethylene terephthalate (PETG) is known to have some enhanced properties as compared to polyethylene terephthalate (PET) homopolymer; this has recently attracted the interest from the fused filament fabrication (FFF) three-dimensional (3D) printing community. PET has shown a reduced ability for repeated recycling through traditional processes. Read More

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Electron deficiency but semiconductive diamond-like BCN originated from three-center bonds.

Phys Chem Chem Phys 2021 Feb;23(4):3087-3092

Department of Materials Science, State Key Lab of Superhard Materials, Jilin University, Changchun 130012, China.

B2CN was one of the synthesized light element compounds, which was expected to be superhard material with a metallic character due to its electron deficienct nature. However, in this work, we discovered two novel semiconducting superhard B2CN phases using particle swarm intelligence technique and first-principles calculations, which were reported to have three-dimensional and four coordinated covalent diamond-like structures. These two new phases were calculated to be dynamically stable at zero and high pressures, and can be deduced from the previously reported Pmma phase by pressure-induced structural phase transitions. Read More

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February 2021

Nontargeted Analysis of Face Masks: Comparison of Manual Curation to Automated GCxGC Processing Tools.

J Am Soc Mass Spectrom 2021 Apr 4;32(4):860-871. Epub 2021 Jan 4.

Southwest Research Institute, Space Science and Engineering, 6220 Culebra Road, San Antonio, Texas 78228, United States.

Masks constructed of a variety of materials are in widespread use due to the COVID-19 pandemic, and people are exposed to chemicals inherent in the masks through inhalation. This work aims to survey commonly available mask materials to provide an overview of potential exposure. A total of 19 mask materials were analyzed using a nontargeted analysis two-dimensional gas chromatography (GCxGC)-mass spectrometric (MS) workflow. Read More

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Plasma miRNAs improve the prediction of coronary atherosclerosis in patients with rheumatoid arthritis.

Clin Rheumatol 2021 Jan 2. Epub 2021 Jan 2.

Vanderbilt University Medical Center, 1161 21st Avenue South, T-3113 MCN, Nashville, TN, 37232-2681, USA.

Objective: MicroRNAs (miRNAs) regulate gene expression and are disease biomarkers. Rheumatoid arthritis (RA) patients have accelerated atherosclerosis leading to excess cardiovascular morbidity and mortality, but traditional risk factors for cardiovascular risk stratification are inadequate. In the general population, miRNAs improve cardiovascular risk estimation beyond traditional risk factors. Read More

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January 2021

Synthesis and characterization of a strong ferromagnetic and high hardness intermetallic compound FeB.

Phys Chem Chem Phys 2020 Dec;22(46):27425-27432

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, People's Republic of China.

Magnetic materials attract great attention due to their fundamental importance and practical application. However, the relatively inferior mechanical properties of traditional magnetic materials limit their application in a harsh environment. In this work, we report an outstanding magnetic material that exhibits both fantastic mechanical and excellent magnetic properties, CuAl2-type Fe2B, synthesized by the high pressure and high temperature method. Read More

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December 2020

A Simple and Highly Efficient Method toward High-Density Garnet-Type LLZTO Solid-State Electrolyte.

ACS Appl Mater Interfaces 2020 Jul 24;12(27):30313-30319. Epub 2020 Jun 24.

State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.

Garnet-type LiLaZrO (LLZO) is among the most attractive candidates for achieving solid-state lithium batteries. LLZO pellets with high density are preferred because of their potential to prevent dendritic Li growth and penetration. However, the presence of pores inside the LLZO electrolyte is inevitable if it is prepared by a traditional solid-state reaction. Read More

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Analysis of Microstructure and Properties of a Ti-AlN Composite Produced by Selective Laser Melting.

Materials (Basel) 2020 May 12;13(10). Epub 2020 May 12.

Faculty of Materials Science and Engineering, Warsaw University of Technology Woloska 141 Str., 02-507 Warsaw, Poland.

Selective Laser Melting (SLM) is a manufacturing technique that is currently used for the production of functional parts that are difficult to form by the traditional methods such as casting or CNC (Computer Numerical Control) cutting from a wide range of metallic materials. In our study, a mixture of commercially pure titanium (Ti) and 15% at. aluminum nitride (AlN) was Selective Laser Melted to form three-dimensional objects. Read More

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A service evaluation of specialist nurse telephone follow-up of bowel cancer patients after surgery.

Br J Nurs 2019 Oct;28(19):1234-1238

Consultant Colorectal Surgeon, Department of Colorectal Surgery, Royal Hampshire Hospital, Winchester, UK.

Introduction: the has called for a reduction in the number of outpatient appointments to reduce pressure on hospital services and increase ease of access for patients. This article presents a service evaluation of an innovative, nurse-led telephone follow-up service for a group of elective bowel cancer patients following surgery.

Methods: the records of patients who underwent surgery over a 2-year period were accessed to determine the number of telephone follow-ups and other investigations. Read More

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October 2019

Effect of Different Raw Material Property for the Fabrication on Al/CNT Nanocomposite Using a Ball Mill with a Discrete Element Method (DEM) Simulation.

Materials (Basel) 2019 Oct 10;12(20). Epub 2019 Oct 10.

Graduate School of Material Science Engineering, Changwon National University, Changwon, Gyoungnam 641-773, Korea.

Carbon nanotubes (CNTs) have received interest as an attractive reinforcing agent metal matrix composites regarded as an increase to mechanical properties of the final product. Aluminum/carbon nanotubes (Al/CNTs) nanocomposites were observed with different raw material at the optimized experimental condition. In this study, Al-based CNTs composites were three different samples, including un-milled Al, un-milled Al with CNTs, and milled Al with CNTs nanocomposites in the presence of additional CNTs with various experimental conditions while using a traditional ball mill (TBM). Read More

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October 2019

A service evaluation of specialist nurse telephone follow-up of bowel cancer patients after surgery.

Br J Nurs 2019 Oct;28(19):1134-1138

Consultant Colorectal Surgeon, Department of Colorectal Surgery, Royal Hampshire Hospital, Winchester, UK.

Introduction: the has called for a reduction in the number of outpatient appointments to reduce pressure on hospital services and increase ease of access for patients. This article presents a service evaluation of an innovative, nurse-led telephone follow-up service for a group of elective bowel cancer patients following surgery.

Methods: the records of patients who underwent surgery over a 2-year period were accessed to determine the number of telephone follow-ups and other investigations. Read More

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October 2019

Interfacial Properties and Bottom/Top Hardness Ratio Produced by Bulk Fill Composites in Dentin Cavities.

Braz Dent J 2019 7;30(5):476-483. Epub 2019 Oct 7.

Department of Dentistry, UFRN - Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil.

The aim of this study was to evaluate the bond strength, bottom/top hardness ratio, marginal adaptation, and interfacial nanoleakage of regular viscosity bulk fill composites (RVBFC) and regular viscosity traditional composites (RVTC). Two RVBFC (Filtek Bulk Fill and Aura Bulk Fill) and two RVTC (Filtek Z250XT and Aura) were assessed. Forty conical cavities (4. Read More

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October 2019

Improvement of Mechanical Properties of Plasma Sprayed AlO-ZrO-SiO Amorphous Coatings by Surface Crystallization.

Materials (Basel) 2019 Oct 2;12(19). Epub 2019 Oct 2.

Institute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, Czech Republic.

Ceramic AlO-ZrO-SiO coatings with near eutectic composition were plasma sprayed using hybrid water stabilized plasma torch (WSP-H). The as-sprayed coatings possessed fully amorphous microstructure which can be transformed to nanocrystalline by further heat treatment. The amorphous/crystalline content ratio and the crystallite sizes can be controlled by a specific choice of heat treatment conditions, subsequently leading to significant changes in the microstructure and mechanical properties of the coatings, such as hardness or wear resistance. Read More

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October 2019

Morphochemical characterization, microhardness, water sorption, and solubility of regular viscosity bulk fill and traditional composite resins.

Microsc Res Tech 2019 Sep 14;82(9):1500-1506. Epub 2019 Jun 14.

Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil.

Objective: To evaluate the morphology of filler particles, chemical composition, microhardness (MH), water sorption (WSp), and solubility (WSl) of a regular viscosity bulk fill and traditional composite resins.

Methods: Eighty samples (Ø:5 mm; height: 4 mm) were prepared according to the factors "composite" (Aura/SDI, FiltekZ250 XT/3M, Aura Bulk Fill/SDI, and Filtek Bulk Fill/3M) and "filling technique" (incremental and bulk) (n = 10). Vickers MH was measured on the top and bottom surfaces of each samples, and then WSp and WSl were obtained by means of mass gain and loss. Read More

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September 2019

Evaluation of Phase Transformation and Mechanical Properties of Metastable Yttria-Stabilized Zirconia by Nanoindentation.

Materials (Basel) 2019 May 23;12(10). Epub 2019 May 23.

State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

Microscopical nonuniformity of mechanical properties caused by phase transformation is one of the main reasons for the failure of the materials in engineering applications. Accurate measurement of the mechanical properties of each phase is of virtual importance, in which the traditional approach like Vickers hardness cannot accomplish, due to the large testing range. In this study, nanoindentation is firstly used to analyze the mechanical properties of each phase and demonstrate the phase transformation in thermal barrier coatings during high-temperature aging. Read More

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WNbMoTa Refractory High-Entropy Alloys Fabricated by Laser Cladding Deposition.

Materials (Basel) 2019 Feb 11;12(3). Epub 2019 Feb 11.

State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

WNbMoTa refractory high-entropy alloys with four different tungsten concentrations ( = 0, 0.16, 0.33, 0. Read More

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February 2019

Revealing the Unusual Rigid Boron Chain Substructure in Hard and Superconductive Tantalum Monoboride.

Chemistry 2019 Apr 8;25(19):5051-5057. Epub 2019 Mar 8.

State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, China.

Poor electrical conductivity severely limits the diverse applications of high hardness materials in situations where electrical conductivities are highly desired. A "covalent metal" TaB with metallic electrical conductivity and high hardness has been fabricated by a high pressure and high temperature method. The bulk modulus, 302. Read More

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Maturation of restorative glass ionomers with simplified application procedure.

Authors:
Nicoleta Ilie

J Dent 2018 12 27;79:46-52. Epub 2018 Sep 27.

Department of Operative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-Universität München, Goethestr. 70, D-80336, Munich, Germany. Electronic address:

Objectives: Recent developments in glass ionomers (GI), including improved mechanical properties, allow the application of a filling without using a varnish to protect the initial setting reaction. Thus, this study aims to monitor the mechanical behavior of these new developments in comparison to traditional and clinically established GIs within one year of maturation by using generally accepted testing methodology along with a new test for determining chipping resistance.

Materials And Methods: Four GIs were characterized by assessing the variation in edge strength (ES), compressive strength (CS), Vickers hardness (HV) and indentation modulus (Y). Read More

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December 2018

Comparative Analysis of Mechanical Properties and Metal-Ceramic Bond Strength of Co-Cr Dental Alloy Fabricated by Different Manufacturing Processes.

Materials (Basel) 2018 Sep 22;11(10). Epub 2018 Sep 22.

Section Medical Materials Science and Technology, University Hospital Tübingen, Osianderstr. 2-8, Tübingen 72076, Germany.

Cobalt-chromium (Co-Cr) alloy is a widely used base material for dental fixed prostheses. These restorations can be produced through casting technique, subtractive or additive manufacturing technologies. However, limited information is available regarding the influence of manufacturing techniques on the properties of Co-Cr alloy since most studies used different chemical compositions of Co-Cr alloy for different manufacturing methods. Read More

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September 2018

Reporting and Interpreting Decision Curve Analysis: A Guide for Investigators.

Eur Urol 2018 12 19;74(6):796-804. Epub 2018 Sep 19.

Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands; Department of Public Health, Erasmus MC, Rotterdam, The Netherlands.

Context: Urologists regularly develop clinical risk prediction models to support clinical decisions. In contrast to traditional performance measures, decision curve analysis (DCA) can assess the utility of models for decision making. DCA plots net benefit (NB) at a range of clinically reasonable risk thresholds. Read More

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December 2018

A Comparative Evaluation of Time-dependent Changes on the Surface Hardness of Bulk Cure Composites: An Study.

Int J Clin Pediatr Dent 2018 May-Jun;11(3):183-187. Epub 2018 Jun 1.

Head, Department of Pedodontics and Preventive Dentistry Krishnadevaraya College of Dental Sciences & Hospital Bengaluru, Karnataka, India.

Objectives: The objective of this study was to assess the surface hardness through Vickers hardness (VH) test of one conventional hybrid resin composites (Filtek Z350), compared with that of two bulk cure resin composites (SDR™, Tetric N Ceram®).

Materials And Methods: Twenty specimens of each material were prepared in cylindrical aluminum molds with an internal diameter of 5 mm and depth of 4 mm, 10 (incremental curing) and 10 (bulk curing).The surface of each specimen was covered with a transparent plastic matrix strip before light curing with conventional visible light for 40 seconds. Read More

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The significance of DOHaD for Small Island Developing States.

J Dev Orig Health Dis 2018 10 12;9(5):487-491. Epub 2018 Jul 12.

1Liggins Institute,University of Auckland,Auckland,New Zealand.

Small Island Developing States (SIDS) are island nations that experience specific social, economic and environmental vulnerabilities associated with small populations, isolation and limited resources. Globally, SIDS exhibit exceptionally high rates of non-communicable disease (NCD) risk and incidence. Despite this, there is a lack of context-specific research within SIDS focused on life course approaches to NCD prevention, particularly the impact of the early-life environment on later disease risk as defined by the Developmental Origins of Health and Disease (DOHaD) framework. Read More

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October 2018

Human Experimental Challenge With Enterotoxigenic Escherichia coli Elicits Immune Responses to Canonical and Novel Antigens Relevant to Vaccine Development.

J Infect Dis 2018 09;218(9):1436-1446

Department of Medicine, Division of Infectious Diseases, Washington University School of Medicine, Saint Louis, Missouri.

Background: Enterotoxigenic Escherichia coli (ETEC) is a major cause of diarrheal illness in the developing world. Enterotoxigenic E coli vaccinology has been challenged by genetic diversity and heterogeneity of canonical antigens. Examination of the antigenic breadth of immune responses associated with protective immunity could afford new avenues for vaccine development. Read More

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September 2018

Effects of Ceramic Density and Sintering Temperature on the Mechanical Properties of a Novel Polymer-Infiltrated Ceramic-Network Zirconia Dental Restorative (Filling) Material.

Authors:
Weiyan Li Jian Sun

Med Sci Monit 2018 May 10;24:3068-3076. Epub 2018 May 10.

Department of Prosthodontics, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China (mainland).

BACKGROUND Polymer-infiltrated ceramic-network (PICN) dental material is a new and practical development in orthodontics. Sintering is the process of forming a stable solid mass from a powder by heating without melting. The aim of this study was to evaluate the effects of sintering temperature on the mechanical properties of a PICN zirconia dental material. Read More

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Mechanical properties of cobalt-chromium 3-unit fixed dental prostheses fabricated by casting, milling, and additive manufacturing.

J Prosthet Dent 2018 Jul 25;120(1):156.e1-156.e7. Epub 2018 Apr 25.

Professor, Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, Bergen, Norway.

Statement Of Problem: New additive manufacturing techniques for nonprecious alloys have made the fabrication of metal-ceramic fixed partial dentures (FPDs) less expensive and less time-consuming. However, whether the mechanical properties produced by these techniques are comparable is unclear.

Purpose: The purpose of this in vitro study was to evaluate the mechanical properties of cobalt-chromium frameworks for FPDs fabricated by 3 different techniques. Read More

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Improvement of the mechanical, tribological and antibacterial properties of glass ionomer cements by fluorinated graphene.

Dent Mater 2018 Jun 19;34(6):e115-e127. Epub 2018 Mar 19.

School of Stomatology, Lanzhou University, Lanzhou 730000, China. Electronic address:

Objective: The aim of this study was to improve the mechanical properties, wear resistance and antibacterial properties of conventional glass ionomer cements (GICs) by fluorinated graphene (FG), under the premise of not influencing their solubility and fluoride ion releasing property.

Materials And Methods: FG with bright white color was prepared using graphene oxide by a hydrothermal reaction. Experimental modified GICs was prepared by adding FG to the traditional GICs powder with four different weight ratios (0. Read More

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Wear Resistance Properties Reinforcement Using Nano-Al/Cu Composite Coating in Sliding Bearing Maintenance.

J Nanosci Nanotechnol 2018 Mar;18(3):2152-2157

School of Mechatronics Engineering, China University of Mining and Technology, Xuzhou 22110, China.

Sliding bearing maintenance is crucial for reducing the cost and extending the service life. An efficient and practical solution is to coat a restorative agent onto the worn/damaged bearings. Traditional pure-copper (Cu) coating results in a soft surface and poor abrasion resistance. Read More

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Just-in-time consent: The ethical case for an alternative to traditional informed consent in randomized trials comparing an experimental intervention with usual care.

Clin Trials 2018 02 11;15(1):3-8. Epub 2017 Dec 11.

4 Department of Bioethics, Clinical Center, National Institutes of Health, Bethesda, MD, USA.

Informed consent for randomized trials often causes significant and persistent anxiety, distress and confusion to patients. Where an experimental treatment is compared to a standard care control, much of this burden is potentially avoidable in the control group. We propose a "just-in-time" consent in which consent discussions take place in two stages: an initial consent to research from all participants and a later specific consent to randomized treatment only from those assigned to the experimental intervention. Read More

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February 2018

Microstructure Refinement in W-YO Alloy Fabricated by Wet Chemical Method with Surfactant Addition and Subsequent Spark Plasma Sintering.

Sci Rep 2017 07 20;7(1):6051. Epub 2017 Jul 20.

Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.

With the aim of preparing high performance oxide-dispersion-strengthened tungsten based alloys by powder metallurgy, the W-YO composite nanopowder precursor was fabricated by an improved wet chemical method with anion surfactant sodium dodecyl sulfate (SDS) addition. It is found that the employment of SDS can dramatically decrease W grain size (about 40 nm) and improve the size uniformity. What's more, SDS addition can also remarkably improve the uniform dispersion of YO particles during the synthesis process. Read More

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Manganese mono-boride, an inexpensive room temperature ferromagnetic hard material.

Sci Rep 2017 03 6;7:43759. Epub 2017 Mar 6.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.

We synthesized orthorhombic FeB-type MnB (space group: Pnma) with high pressure and high temperature method. MnB is a promising soft magnetic material, which is ferromagnetic with Curie temperature as high as 546.3 K, and high magnetization value up to 155. Read More

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Net cholesterol efflux capacity of HDL enriched serum and coronary atherosclerosis in rheumatoid arthritis.

IJC Metab Endocr 2016 Dec 28;13:6-11. Epub 2016 Aug 28.

Vanderbilt University Medical Center, Nashville, TN, USA.

Background/objectives: Cardiovascular (CV) risk is increased in patients with rheumatoid arthritis (RA), but not fully explained by traditional risk factors such as LDL and HDL cholesterol concentrations. The cholesterol efflux capacity of HDL may be a better CV risk predictor than HDL concentrations. We hypothesized that HDL's cholesterol efflux capacity is impaired and inversely associated with coronary atherosclerosis in patients with RA. Read More

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December 2016