638 results match your criteria durability reducing

Core-shell PdAu nanocluster catalysts to suppress sulfur poisoning.

Phys Chem Chem Phys 2021 Jun 15. Epub 2021 Jun 15.

Department of Material Science and Engineering, University of Texas at Dallas, Richardson, 75080, USA.

Reducing sulfur poisoning is significant for maintaining the catalytic efficiency and durability of heterogeneous catalysts. We screened PdAu nanoclusters with specific Pd : Au ratios based on Monte Carlo simulations and then carried out density functional calculations to reveal how to reduce sulfur poisoning via alloying. Among various nanoclusters, the core-shell structure Pd13Au42 ([email protected]) exhibits a low adsorption energy of SO2 (-0. Read More

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Households' willingness to pay and preferences for improved cook stoves in Ethiopia.

Environ Sci Pollut Res Int 2021 Jun 12. Epub 2021 Jun 12.

Department of Economics, Addis Ababa University, Addis Ababa, Ethiopia.

This paper examines households' preferences, willingness to pay, and determinants of adopting improved cook stoves in rural Ethiopia. The study uses primary household data selected randomly from three districts in Ethiopia's Oromia region. The data was collected using a mix of contingent and choice experiment methods of valuation. Read More

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What clinical trials of ablation for atrial fibrillation tell us - and what they do not.

Heart Rhythm O2 2021 Apr 16;2(2):174-186. Epub 2021 Feb 16.

Department of Medicine, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, New York.

Atrial fibrillation (AF) is the most prevalent cardiac arrhythmia in clinical practice. Radiofrequency and cryoballoon catheter ablation are therapeutic options in addition to antiarrhythmic drug therapy for the treatment of AF. Ablation is effective at reducing recurrent atrial arrhythmias and also in the reduction of AF burden. Read More

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Meteorological factors against COVID-19 and the role of human mobility.

PLoS One 2021 4;16(6):e0252405. Epub 2021 Jun 4.

CEMOTEV, Université Versailles Saint-Quentin en Yvelines (Paris Saclay), Versailles, France.

In the vein of recent empirical literature, we reassessed the impact of weather factors on Covid-19 daily cases and fatalities in a panel of 37 OECD countries between 1st January and 27th July 2020. We considered five different meteorological factors. For the first time, we used a dynamic panel model and considered two different kinds of channels between climate and Covid-19 virus: direct/physical factors related to the survival and durability dynamics of the virus on surfaces and outdoors and indirect/social factors through human behaviour and individual mobility, such as walking or driving outdoors, to capture the impact of weather on social distancing and, thus, on Covid-19 cases and fatalities. Read More

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Cyclic drying and wetting tests on combined remediation of chromium-contaminated soil by calcium polysulfide, synthetic zeolite and cement.

Sci Rep 2021 Jun 2;11(1):11643. Epub 2021 Jun 2.

College of Materials Science and Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning Province, China.

Using calcium polysulfide as the reducing agent, synthetic zeolite as the adsorbent, and cement as the curing agent, the dual-index orthogonal test method was used to determine the best remediation dosage of chromium-contaminated soil. On this basis, through the dry-wet cycle test, the durability of the chromium-contaminated soil after repair is analyzed from the perspectives of unconfined compressive strength, toxic leaching concentration, quality loss, and microscopic characterization. Test results showed that the optimal ratio for the joint repair of chromium-contaminated soil was 3 times the amount of CaS, 15% synthetic zeolite, and 20% cement. Read More

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Synthesis of a novel porous AgO nanomaterial on ion exchange resin and its application for COD determination of high salinity water.

Sci Rep 2021 Jun 1;11(1):11487. Epub 2021 Jun 1.

Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam.

This study reports for the first time on the synthesis of novel [email protected] material and its application for reducing the chloride effect on COD determination of high salinity water. This engineered core-shell nanomaterial with cationic ion exchange resin core and porous AgO shell was prepared by facile ion exchange and silver oxidation method at ambient temperature without using toxic chemicals. The material was characterized by FTIR, XRD, SEM, and SEM-EDX mapping. Read More

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Mechanical and Water Uptake Properties of Epoxy Nanocomposites with Surfactant-Modified Functionalized Multiwalled Carbon Nanotubes.

Nanomaterials (Basel) 2021 May 7;11(5). Epub 2021 May 7.

School of Energy Materials, Mahatma Gandhi University, Kerala 686560, India.

The superior mechanical properties of multi-walled carbon nanotubes (MWCNTs) play a significant role in the improvement of the mechanical and thermal stability of an epoxy matrix. However, the agglomeration of carbon nanotubes (CNTs) in the epoxy is a common challenge and should be resolved to achieve the desired enhancement effect. The present paper investigated the thermal, mechanical, and water uptake properties of epoxy nanocomposites with surfactant-modified MWCNTs. Read More

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Production of asphalt mixes with copper industry wastes: Use of copper slag as raw material replacement.

J Environ Manage 2021 May 29;293:112867. Epub 2021 May 29.

Gi(2)V Research Group, Institute of Civil Engineering, Faculty of Engineering Sciences, University Austral of Chile, General Lagos St. #2060, Of. 11.302, 5090000, Valdivia, Chile.

Copper slag is a waste obtained from copper production and it has a limited use, being mainly accumulated in landfills on a massive scale. This material presents a high hardness and it has hydrophobic properties, so it can be used as aggregate replacement in the production of asphalt mixtures. However, each size of copper slag behaves differently when used in asphalt mixes, especially under changing conditions of moisture or temperature. Read More

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Perchlorate occurrence in foodstuffs and water: Analytical methods and techniques for removal from water - A review.

Food Chem 2021 Oct 18;360:130146. Epub 2021 May 18.

Guangzhou Quality Supervision and Testing Institute, Research Center of Risk Dynamic Detection and Early Warning for Food Safety of Guangzhou City, Key Laboratory of Detection Technology for Food Safety of Guangzhou City, Guangzhou 511447, China.

Perchlorate (ClO), a type of contaminant with high diffusivity and durability, has been widely detected in water and foodstuffs, arousing a global concern. It can interfere with normal function of the human thyroid gland, affecting human health. Therefore, determination of perchlorate in water and foodstuffs, and removal from water are important. Read More

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October 2021

The Long-Term Impact of Levodopa/Carbidopa Intestinal Gel on 'Off'-time in Patients with Advanced Parkinson's Disease: A Systematic Review.

Adv Ther 2021 Jun 20;38(6):2854-2890. Epub 2021 May 20.

King's College London, and Parkinson's Foundation International Centre of Excellence, King's College Hospital, London, UK.

Introduction: Levodopa/carbidopa intestinal gel (LCIG; carbidopa/levodopa enteral suspension) has been widely used and studied for the treatment of motor fluctuations in levodopa-responsive patients with advanced Parkinson's disease (PD) when other treatments have not given satisfactory results. Reduction in 'off'-time is a common primary endpoint in studies of LCIG, and it is important to assess the durability of this response. This systematic literature review was conducted to qualitatively summarise the data on the long-term effects of LCIG therapy on 'off'-time. Read More

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Novel external stenting for reconstruction of high flow arteriovenous fistula.

J Vasc Access 2021 May 10:11297298211015508. Epub 2021 May 10.

Vascular Access Center, Asklepios Clinic Barmbek, Hamburg, Germany.

Background: High-flow arteriovenous fistulae (HF-AVF) may lead to adverse cardiac remodeling in hemodialysis patients. We have investigated whether a novel external stent is safe and effective in reducing and stabilizing flow rates during a 1-year follow-up after HF-AVF reconstruction.

Methods: All patients with HF-AVF (access flow rate ⩾ 1500 ml/min), who underwent HF-AVF reconstruction with external stenting in two centers between June 2018 and May 2020, were included in this retrospective analysis. Read More

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Analysis of frequency and severity of relapses in multiple sclerosis patients treated with cladribine tablets or placebo: The CLARITY and CLARITY Extension studies.

Mult Scler 2021 May 10:13524585211010294. Epub 2021 May 10.

Merck KGaA, Darmstadt, Germany.

Background: In the CLARITY (CLAdRIbine Tablets treating multiple sclerosis orallY) study of patients with relapsing-remitting multiple sclerosis, treatment with cladribine tablets 3.5 mg/kg (CladT) significantly reduced the annualised relapse rate (ARR) versus placebo; this effect was sustained in CLARITY Extension, without further treatment.

Objective: To assess the frequency and severity of relapses in patients treated with CladT versus placebo in CLARITY over 2 years and evaluate the durability of effect in patients who received no further treatment for 2 years in CLARITY Extension. Read More

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Analysis of the potential impact of durability, timing, and transmission blocking of COVID-19 vaccine on morbidity and mortality.

EClinicalMedicine 2021 May 26;35:100863. Epub 2021 Apr 26.

Center for Disease Dynamics, Economics & Policy, Washington, D.C., USA.

Background: COVID-19 vaccines have been approved and made available. While questions of vaccine allocation strategies have received significant attention, important questions remain regarding the potential impact of the vaccine given uncertainties regarding efficacy against transmission, availability, timing, and durability.

Methods: We adapted a susceptible-exposed-infectious-recovered (SEIR) model to examine the potential impact on hospitalization and mortality assuming increasing rates of vaccine efficacy, coverage, and administration. Read More

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Durability and Mechanical Properties of Concrete Reinforced with Basalt Fiber-Reinforced Polymer (BFRP) Bars: Towards Sustainable Infrastructure.

Polymers (Basel) 2021 Apr 26;13(9). Epub 2021 Apr 26.

Department of Civil & Biomedical Engineering, College of Engineering, Technology, and Architecture, University of Hartford, West Hartford, CT 06117, USA.

Reducing the fingerprint of infrastructure has become and is likely to continue to be at the forefront of stakeholders' interests, including engineers and researchers. It necessary that future buildings produce minimal environmental impact during construction and remain durable for as long as practicably possible. The use of basalt fiber-reinforced polymer (BFRP) bars as a replacement for carbon steel is reviewed in this article by examining the literature from the past two decades with an emphasis on flexural strength, serviceability, and durability. Read More

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A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete.

Materials (Basel) 2021 Apr 24;14(9). Epub 2021 Apr 24.

Department of Civil and Environmental Engineering, University of Cyprus, 75 Kallipoleos Av., P.O. Box 20537, Nicosia 1678, Cyprus.

Recycle concrete aggregates (RCA) consist of natural aggregates and remnant mortar adhered to their surface. The amount, size, and morphology of the adherent remainder paste influences quality aspects of RCA, such as their bonding potential with new cement matrix in an RCA-based concrete, as well as the concrete's overall rheological and performance characteristics. The objective of this research was to study the effect of reducing the adhered mortar in RCA, by means of a mechanical treatment method, on the performance of concrete containing RCA at different percentages. Read More

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Preparation of Ag NPs and Its Multifunctional Finishing for Cotton Fabric.

Polymers (Basel) 2021 Apr 19;13(8). Epub 2021 Apr 19.

Department of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China.

To explore the combination of silver nanoparticles (Ag NPs) prepared in a green manner with cotton fabrics and the washing durability of the fabric after the combination. In this paper, the natural material, honeysuckle extract, was used as a reducing agent to prepare the Ag NPs' solution. The structure and size of Ag NPs were analyzed using ultraviolet-visible spectrophotometry (UV-vis), transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray powder diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy characterization. Read More

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Petrographic and Geotechnical Characteristics of Carbonate Aggregates from Poland and Their Correlation with the Design of Road Surface Structures.

Materials (Basel) 2021 Apr 18;14(8). Epub 2021 Apr 18.

Eko Cinere Ltd., Warszawska 6/32, 15-063 Białystok, Poland.

The paper presents the basic problem related with practical application of carbonate rocks in construction: are carbonate aggregates produced from such rocks favorable for building engineering, particularly for road design and construction? To resolve this problem, (1) the geological-engineering properties of aggregates are presented, (2) the correlation between petrographic and engineering parameters is shown, and (3) a strict correlation between the geological-engineering properties and the freezing-thawing and crushing resistance is recognized. This knowledge has allowed to assess the usefulness of asphalt concrete (AC) made from dolomite and limestone aggregates in the design and construction of road surface structures. The petrography was characterized using optical microscopy and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscope (EDS). Read More

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Comparative Overview of the Performance of Cementitious and Non-Cementitious Nanomaterials in Mortar at Normal and Elevated Temperatures.

Nanomaterials (Basel) 2021 Apr 2;11(4). Epub 2021 Apr 2.

Civil Engineering Department, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia.

Nanotechnology has emerged as a field with promising applications in building materials. Nanotechnology-based mortars are examples of such building materials that have widespread applications in the construction industry. The main nanomaterials used in mortars include nano-silica, nano-magnesium oxide, nano-alumina, nano-titanium oxide, nano-zinc oxide, nano-clay, and nano-carbon. Read More

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Modeling and Simulation in Capacity Degradation and Control of All-Solid-State Lithium Battery Based on Time-Aging Polymer Electrolyte.

Polymers (Basel) 2021 Apr 8;13(8). Epub 2021 Apr 8.

Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, China.

The prediction of electrochemical performance is the basis for long-term service of all-solid-state-battery (ASSB) regarding the time-aging of solid polymer electrolytes. To get insight into the influence mechanism of electrolyte aging on cell fading, we have established a continuum model for quantitatively analyzing the capacity evolution of the lithium battery during the time-aging process. The simulations have unveiled the phenomenon of electrolyte-aging-induced capacity degradation. Read More

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Medicaid Waivers and Tenancy Supports for Individuals Experiencing Homelessness: Implementation Challenges in Four States.

Milbank Q 2021 Apr 27. Epub 2021 Apr 27.

Rutgers Center for State Health Policy.

Policy Points Medicaid policymakers have a growing interest in addressing homelessness as a social determinant of health and driver of the potentially avoidable use of expensive medical services. Drawing on extensive document reviews and in-depth interviews in four early-adopter states, we examined the implementation of Medicaid's Section 1115 demonstration waivers to test strategies to finance tenancy support services for persons experiencing or at risk of homelessness.

Context: The Affordable Care Act extended Medicaid eligibility to large numbers of individuals experiencing or at risk of homelessness. Read More

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Changing the approach to type 2 diabetes treatment: A comparison of glucagon-like peptide-1 receptor agonists and sulphonylureas across the continuum of care.

Diabetes Metab Res Rev 2021 Jan 10. Epub 2021 Jan 10.

Centro Cardiologico Monzino IRCCS, Head of Diabetology, Endocrinology and Metabolic Diseases Unit, Milano, Italy.

Despite the importance of individualised strategies for patients with type 2 diabetes mellitus (T2DM) and the availability of alternative treatments, including glucagon-like peptide-1 receptor agonists (GLP-1 RAs), sulphonylureas are still widely used in practice. Clinical evidence shows that GLP-1 RAs may provide better and more durable glycaemic control than sulphonylureas, with lower risk of hypoglycaemia. Other reported benefits of GLP-1 RAs include weight loss rather than weight gain (as observed with sulphonylureas), blood pressure reduction and improvement in lipid profiles. Read More

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January 2021

Evaluation of COVID-19 vaccination strategies with a delayed second dose.

PLoS Biol 2021 04 21;19(4):e3001211. Epub 2021 Apr 21.

Center for Infectious Disease Modeling and Analysis, Yale School of Public Health, New Haven, Connecticut, United States of America.

Two of the Coronavirus Disease 2019 (COVID-19) vaccines currently approved in the United States require 2 doses, administered 3 to 4 weeks apart. Constraints in vaccine supply and distribution capacity, together with a deadly wave of COVID-19 from November 2020 to January 2021 and the emergence of highly contagious Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) variants, sparked a policy debate on whether to vaccinate more individuals with the first dose of available vaccines and delay the second dose or to continue with the recommended 2-dose series as tested in clinical trials. We developed an agent-based model of COVID-19 transmission to compare the impact of these 2 vaccination strategies, while varying the temporal waning of vaccine efficacy following the first dose and the level of preexisting immunity in the population. Read More

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UTX promotes CD8 T cell-mediated antiviral defenses but reduces T cell durability.

Cell Rep 2021 Apr;35(2):108966

Department of Genetics, UNC-Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Microbiology & Immunology, UNC-Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, UNC-Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA. Electronic address:

Persistent virus infections can cause pathogenesis that is debilitating or lethal. During these infections, virus-specific T cells fail to protect due to weakened antiviral activity or failure to persist. These outcomes are governed by histone modifications, although it is unknown which enzymes contribute to T cell loss or impaired function over time. Read More

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Platinum-Based Electrocatalysts for Direct Alcohol Fuel Cells: Enhanced Performances toward Alcohol Oxidation Reactions.

Chempluschem 2021 Mar 23;86(4):574-586. Epub 2021 Mar 23.

The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano Science and Technology, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P. R. China.

In the past few decades, Pt-based electrocatalysts have attracted great interests due to their high catalytic performances toward the direct alcohol fuel cell (DAFC). However, the high cost, poor stability, and the scarcity of Pt have markedly hindered their large-scale utilization in commerce. Therefore, enhancing the activity and durability of Pt-based electrocatalysts, reducing the Pt amount and thus the cost of DAFC have become the keys for their practical applications. Read More

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Reliability Prediction of Acrylonitrile O-Ring for Nuclear Power Applications Based on Shore Hardness Measurements.

Polymers (Basel) 2021 Mar 19;13(6). Epub 2021 Mar 19.

Department of Manufacturing Engineering, Universidad Nacional de Educación a Distancia (UNED), 28040 Madrid, Spain.

The degradation of polymeric components is of considerable interest to the nuclear industry and its regulatory bodies. The objective of this work was the development of a methodology to determine the useful life-based on the storage temperature-of acrylonitrile O-rings used as mechanical sealing elements to prevent leakages in nuclear equipment. To this aim, a reliability-based approach that allows prediction of the use-suitability of different storage scenarios (that involve different storage times and temperatures) considering the further required in-service performance, is presented. Read More

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The Role of Supplementary Cementitious Materials (SCMs) in Ultra High Performance Concrete (UHPC): A Review.

Materials (Basel) 2021 Mar 17;14(6). Epub 2021 Mar 17.

Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea.

Although ultra high-performance concrete (UHPC) has great performance in strength and durability, it has a disadvantage in the environmental aspect; it contains a large amount of cement that is responsible for a high amount of CO emissions from UHPC. Supplementary cementitious materials (SCMs), industrial by-products or naturally occurring materials can help relieve the environmental burden by reducing the amount of cement in UHPC. This paper reviews the effect of SCMs on the properties of UHPC in the aspects of material properties and environmental impacts. Read More

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A Placebo-Controlled, Pseudo-Randomized, Crossover Trial of Botanical Agents for Gulf War Illness: Resveratrol (), Luteolin, and Fisetin ().

Int J Environ Res Public Health 2021 03 3;18(5). Epub 2021 Mar 3.

Department of Psychology, University of Alabama at Birmingham, CH 233, 1300 University Boulevard, Birmingham, AL 35233, USA.

A chronic multi-symptom illness of unknown etiology, Gulf War Illness (GWI) affects 175,000 to 250,000 veterans of the Gulf War. Because inflammation has suspected involvement in the pathophysiology of GWI, botanical treatments that target inflammation may be beneficial in reducing symptoms. No FDA-approved treatments currently exist for GWI, and rapid prioritization of agents for future efficacy testing is important. Read More

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A Placebo-Controlled, Pseudo-Randomized, Crossover Trial of Botanical Agents for Gulf War Illness: Curcumin ( Boswellia (), and French Maritime Pine Bark ().

Int J Environ Res Public Health 2021 03 3;18(5). Epub 2021 Mar 3.

Department of Psychology, University of Alabama at Birmingham, CH 233, 1300 University Blvd, Birmingham, AL 35233, USA.

This report is part of a larger study designed to rapidly and efficiently screen potential treatments for Gulf War Illness (GWI) by testing nine different botanicals. In this placebo-controlled, pseudo-randomized, crossover clinical trial of 20 men with GWI, we tested three botanical agents with putative peripheral and central anti-inflammatory actions: curcumin (), boswellia (), and French maritime pine bark extract (). Participants completed 30 +/- 3 days of baseline symptom reports, followed by 30 +/- 3 days of placebo, 30 +/- 3 days of lower-dose botanical, and 30 +/- 3 days of higher-dose botanical. Read More

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Investigation of Electrolyte-Dependent Carbonate Formation on Gas Diffusion Electrodes for CO Electrolysis.

ACS Appl Mater Interfaces 2021 Apr 25;13(13):15132-15142. Epub 2021 Mar 25.

The electrochemical reduction of CO (ECOR) is a promising method for reducing CO emissions and producing carbon-neutral fuels if long-term durability of electrodes can be achieved by identifying and addressing electrode degradation mechanisms. This work investigates the degradation of gas diffusion electrodes (GDEs) in a flowing, alkaline CO electrolyzer via the formation of carbonate deposits on the GDE surface. These carbonate deposits were found to impede electrode performance after only 6 h of operation at current densities ranging from -50 to -200 mA cm. Read More

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Reducing Immunogenicity of Pegloticase With Concomitant Use of Mycophenolate Mofetil in Patients With Refractory Gout: A Phase II, Randomized, Double-Blind, Placebo-Controlled Trial.

Arthritis Rheumatol 2021 Mar 22. Epub 2021 Mar 22.

University of Alabama at Birmingham.

Objective: Pegloticase is used for the treatment of severe gout, but its use is limited by immunogenicity. This study was undertaken to evaluate whether mycophenolate mofetil (MMF) prolongs the efficacy of pegloticase.

Methods: Participants were randomized 3:1 to receive 1,000 mg MMF twice daily or placebo for 14 weeks, starting 2 weeks before receiving pegloticase and continuing while receiving intravenous pegloticase 8 mg biweekly for 12 weeks. Read More

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