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Strength &,conditioning

M Verlinde, J Gorny, G Montavon, S Khalfallah, B Boulet, C Augeray, D Larivière, C Dalencourt, A Gourgiotis
A new rapid protocol for 226 Ra separation and preconcentration in natural water samples was developed before its determination by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). For this purpose, the commercially available Ra specific resin AnaLig® Ra-01 was used. This resin shows a high selectivity for radium in a large range of acid concentrations and no affinity or possible elution of 226 Ra interfering elements. The distribution coefficients of Ra and other elements over a wide range of acid (HCl and HNO3 ) concentrations were obtained...
February 13, 2019: Journal of Environmental Radioactivity
Lorene M Nelson, Mitchell T Wallin, Ruth Ann Marrie, W J Culpepper, Annette Langer-Gould, Jon Campbell, Stephen Buka, Helen Tremlett, Gary Cutter, Wendy Kaye, Laurie Wagner, Nicholas G Larocca
OBJECTIVE: Considerable gaps exist in knowledge regarding the prevalence of neurologic diseases, such as multiple sclerosis (MS), in the United States. Therefore, the MS Prevalence Working Group sought to review and evaluate alternative methods for obtaining a scientifically valid estimate of national MS prevalence in the current health care era. METHODS: We carried out a strengths, weaknesses, opportunities, and threats (SWOT) analysis for 3 approaches to estimate MS prevalence: population-based MS registries, national probability health surveys, and analysis of administrative health claims databases...
February 15, 2019: Neurology
Sandi Brudar, Barbara Hribar-Lee
Amyloid fibrils, highly ordered protein aggregates, play an important role in the onset of several neurological disorders. Many studies have assessed amyloid fibril formation under specific solution conditions, but they all lack an important phenomena in biological solutions-buffer specific effects. We have focused on the formation of hen egg-white lysozyme (HEWL) fibrils in aqueous solutions of different buffers in both acidic and basic pH range. By means of UV-Vis spectroscopy, fluorescence measurements and CD spectroscopy, we have managed to show that fibrillization of HEWL is affected by buffer identity (glycine, TRIS, phosphate, KCl-HCl, cacodylate, HEPES, acetate), solution pH, sample incubation (agitated vs...
February 14, 2019: Biomolecules
Fernanda G C Tessarolli, Sara T S Souza, Ailton S Gomes, Claudia R E Mansur
Relatively smaller volumes of gelling systems had been used to address conformance problems located near the wellbore in oil reservoirs with harsh temperature and salinity conditions. These gelling systems were formulated with high concentrations of low-molecular-weight acrylamide-based polymers crosslinked with polyethylenimine (PEI). However, for in-depth conformance control, in which large gelant volumes and long gelation times were required, lower-base polymer loadings were necessary to ensure the economic feasibility of the treatment...
February 14, 2019: Gels
Alice Gonçalves Penelas, Eduardo Moreira da Silva, Laiza Tatiana Poskus, Amanda Cypriano Alves, Isis Ingrid Nogueira Simões, Viviane Hass, José Guilherme Antunes Guimarães
This study aimed at evaluating the use of biological dentin post (BDP), achieved by milling bovine root, through the analyses of mechanical and optical properties. BDPs were compared to a glass fiber post (GFP) in the following tests (n = 10): a) elastic modulus (E) and flexural resistance (σ) by three point bending test; b) fracture resistance (FR) by compressive load at 45° and failure pattern; c) light transmitting (LT) ability and their influence on the resin cement's degree of conversion (DC%); d) bond strength (BS) by push-out test and failure pattern...
January 30, 2019: Journal of the Mechanical Behavior of Biomedical Materials
M Navadeh-Toupchi, N Takemura, M D Anderson, D Y Oberli, M T Portella-Oberli
We demonstrate the existence of a cross Feshbach resonance by strongly driving a lower polariton mode and by monitoring in time the transmission of a short optical pulse at the energy of the upper polariton mode in a semiconductor microcavity. From the signatures of the optical resonance, strength, and sign of the energy shift, we attribute the origin of the scattering process between polariton modes with opposite circular polarization to a biexciton bound state. From this study, we infer the conditions required for a strong enhancement of the generation of entangled photon pairs...
February 1, 2019: Physical Review Letters
Victor V Revin, Nikolay A Pestov, Michael V Shchankin, Vladimir M Mishkin, Vladimir I Platonov, Dmitriy A Uglanov
Aerogels with a density of 4.2-22.8 kg/m3 were obtained from bacterial cellulose synthesized in static and dynamic cultivation conditions on a molasses medium. The strength properties and porous structure of the aerogels strongly depended on their density. With a 22.8 kg/m3 aerogel density, the modulus of elasticity at 80% compression of the sample was 0.1 MPa. The decrease in the density of aerogels led to an increase in the pore sizes ranging from 20 µm to 1000 µm and a decrease in the modulus of elasticity...
February 15, 2019: Biomacromolecules
Wei Gao, Hiroki Ota, Daisuke Kiriya, Kuniharu Takei, Ali Javey
Wearable sensors play a crucial role in realizing personalized medicine, as they can continuously collect data from the human body to capture meaningful health status changes in time for preventive intervention. However, motion artifacts and mechanical mismatches between conventional rigid electronic materials and soft skin often lead to substantial sensor errors during epidermal measurement. Because of its unique properties such as high flexibility and conformability, flexible electronics enables a natural interaction between electronics and the human body...
February 15, 2019: Accounts of Chemical Research
Mohamed A Soliman, Ghada M Rashad, Mamdoh R Mahmoud
Montmorillonite clay was organically modified with thoron (TH) and was employed as an adsorbent for removal of cobalt(II) radionuclides from aqueous solutions. Batch adsorption experiments, under several operational parameters such as pH, contact time, initial adsorbate concentration, adsorbent dosage, ionic strength, and temperature, were conducted to determine the optimum conditions for efficient removal of cobalt(II) radionuclides. The obtained data showed that almost complete removals were achieved for cobalt(II) at pH values ≥ 3...
February 14, 2019: Environmental Science and Pollution Research International
Xiang Xu, Qiangqiang Zhang, Menglong Hao, Yuan Hu, Zhaoyang Lin, Lele Peng, Tao Wang, Xuexin Ren, Chen Wang, Zipeng Zhao, Chengzhang Wan, Huilong Fei, Lei Wang, Jian Zhu, Hongtao Sun, Wenli Chen, Tao Du, Biwei Deng, Gary J Cheng, Imran Shakir, Chris Dames, Timothy S Fisher, Xiang Zhang, Hui Li, Yu Huang, Xiangfeng Duan
Ceramic aerogels are attractive for thermal insulation but plagued by poor mechanical stability and degradation under thermal shock. In this study, we designed and synthesized hyperbolic architectured ceramic aerogels with nanolayered double-pane walls with a negative Poisson's ratio (-0.25) and a negative linear thermal expansion coefficient (-1.8 × 10-6 per °C). Our aerogels display robust mechanical and thermal stability and feature ultralow densities down to ~0.1 milligram per cubic centimeter, superelasticity up to 95%, and near-zero strength loss after sharp thermal shocks (275°C per second) or intense thermal stress at 1400°C, as well as ultralow thermal conductivity in vacuum [~2...
February 15, 2019: Science
Hooman Zarif Najafi, Mohammad Mousavi, Nadia Nouri, Sepideh Torkan
INTRODUCTION: There are controversies regarding the most reliable conditioning method of the aged composite surface to ensure optimum bond strength. The purpose of this study was to evaluate the shear bond strength of metal brackets to microhybrid composite restorations after different surface preparation techniques. MATERIALS AND METHODS: A total of sixty microhybrid composite samples were prepared using upper right central incisor celluloid crown as a mold. Samples were treated with 4 different surface conditioning methods: (1) etching, (2) sandblasting, (3) grinding, and (4) CO2 laser irradiation...
February 11, 2019: International Orthodontics
Yang-Kyun Park, Dong-Geun Lee
Ti-39Nb-6Zr-0.45Al alloy was developed for biological applications as exchangeable hard tissue. This alloy has very low elastic modulus, but lower strength than Ti-6Al-4V alloy. This study was performed for improving the strength by various heat treatments and microstructural characteristics and mechanical properties of Ti-39Nb-6Zr-0.45Al alloy were investigated. Heat treatments were conducted at 350 °C, 400 °C, 450 °C, 500 °C, 550 °C and 600 °C, followed by water quenching. Microstructures of Ti-39Nb-6Zr-0...
July 1, 2019: Journal of Nanoscience and Nanotechnology
So-Hyun Gong, Ji-Young Lee, Yoon-Jun Kim
The 7000 series aluminum alloys are widely used in the aerospace and automotive industries due to their high strength and low weight. Those advantages of the 7000 series aluminum alloys, however, are hampered by an occurrence of the hydrogen embrittlement and/or stress corrosion cracking under certain heat treatment conditions such as natural or artificial aging treatment. Herein, we utilize an atom-probe tomography (APT) and a transmission electron microscopy (TEM) to study the microstructural evolution of a naturally aged commercial 7075-T4 grade aluminum alloy...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Dong-Gi Lee, Jin-Woo Kim
In this study, materials with each different fiber content ratio and fiber orientation state were used in the study for the decision of molding condition of GFRP and the condition of lap joint. Clarify joint strength and lap joint efficiency during high temperature and compression press lap joint molding of GFRP and research data regarding the lap length of the joint part was presented. Thus, the purpose of this study is to contribute to the substitution of existing products as well as usage development in the non-automobile field and also to find out precise dynamic characteristics as designing data of structures...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Suneev Anil Bansal, Amrinder Pal Singh, Suresh Kumar
Graphene, two-dimensional (2D) sheet of carbon structure, in its purest form has shown potential for application in the fields of electronics, semiconductor, sensing, energy, displays, biomedical engineering, etc. Graphene oxide (GO) is easier to synthesise than the pristine graphene, scores comparable in terms of mechanical strength, but lags in electrical and thermal conductivity. GO plays an important role in nano-composites for use in loading conditions requiring superior mechanical strength. GO is a suitable candidate as reinforcement due to its better solubility in the epoxy polymer, resulting in improved properties...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Min-Seok Baek, Hyung-Jun Kim, Kee-Ahn Lee
This study is related to cold spray 3D printing (kinetic metallization) capable of manufacturing near-net shape material. Anisotropy on the compressive deformation behavior of pure copper materials manufactured using cold spray process was investigated. In addition, the deformed microstructures that change according to strain were analyzed with different direction (spraying direction, perpendicular direction). Cu bulk material manufactured through cold spray processes showed distinctive structures wherein high-density dislocations had been accumulated because individual powder particles collided at high speed...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Yu-Jin Hwang, Dong-Geun Lee
For metals to be used as biomaterials, there must not be harmful reaction between the corrosion product of metal or eluted ion, and bio-tissue. Titanium is one of the excellent bio-compatible materials and generally it has tendency to have a small amount elution of Ti ions inside the body. Titanium alloy need to have low elastic modulus for reducing the stress shield effect. Ti-39Nb-6Zr alloy which is consist of biocompatible element such as Nb and Zr, has low elastic modulus with below 60 GPa, but it shows lower yield stress and tensile stress compared with Ti-6Al-4V alloy...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Mohamad Reza Sedighi Moghadam, Mostafa Ghanei, Klaus Kenn, Nicholas S Hopkinson
BACKGROUND: More than 60,000 people have health problems due to chemical weapons exposure during the Iran-Iraq war. Respiratory consequences of mustard gas exposure are common and disabling; medical interventions have limited effect. Patients complain of cough, sputum, breathlessness and exercise limitation. We hypothesized that patients with this condition would benefit from pulmonary rehabilitation. METHODS: We outline the protocol for an assessor-blind, two-armed, parallel-design randomized controlled clinical trial (IRCT2016051127848N1)...
February 14, 2019: Trials
Jeremy C Kane, Melissa A Elafros, Sarah M Murray, Ellen M H Mitchell, Jura L Augustinavicius, Sara Causevic, Stefan D Baral
BACKGROUND: Stigma is associated with health conditions that drive disease burden in low- and middle-income countries (LMICs), including HIV, tuberculosis, mental health problems, epilepsy, and substance use disorders. However, the literature discussing the relationship between stigma and health outcomes is largely fragmented within disease-specific siloes, thus limiting the identification of common moderators or mechanisms through which stigma potentiates adverse health outcomes as well as the development of broadly relevant stigma mitigation interventions...
February 15, 2019: BMC Medicine
Siwei Zhang, Jialin Liang, Jinjia Huang, Shaosong Huang, Li Zheng, Shuiyu Sun, Zhenyi Zhong, Xinghong Zhang, Xiaoyu Yu, Zhijie Guan
The initial pH value of sludge affects sludge anaerobic digestion and dewatering performance. In order to determine the suitable pH value and decrease the sludge digestion time, in this study, the effect and the mechanism of combined acidification and anaerobic mesophilic digestion (acid-AMD) on sludge dewaterability were investigated. The changes and relationships among the extracellular polymeric substances (EPS), physicochemical properties, and rheological behavior of the treated sludge were analyzed. The results indicated that the combined acid-AMD treatment improved sludge dewaterability approximately 36...
February 5, 2019: Journal of Hazardous Materials
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