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https://www.readbyqxmd.com/read/29468152/negative-thermal-expansion-over-a-wide-temperature-range-in-fe-doped-mnnige-composites
#1
Wenjun Zhao, Ying Sun, Yufei Liu, Kewen Shi, Huiqing Lu, Ping Song, Lei Wang, Huimin Han, Xiuliang Yuan, Cong Wang
Fe-doped MnNiGe alloys were successfully synthesized by solid-state reaction. Giant negative thermal expansion (NTE) behaviors with the coefficients of thermal expansion (CTE) of -285.23 × 10-6 K-1 (192-305 K) and -1167.09 × 10-6 K-1 (246-305 K) have been obtained in Mn0.90 Fe0.10 NiGe and MnNi0.90 Fe0.10 Ge, respectively. Furthermore, these materials were combined with Cu in order to control the NTE properties. The results indicate that the absolute value of CTE gradually decreases with increasing Cu contents...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29466663/cis-to-trans-isomerization-of-azobenzene-derivatives-studied-with-transition-path-sampling-and-qm-mm-molecular-dynamics
#2
Anja Muzdalo, Peter Saalfrank, Jocelyne Vreede, Mark Santer
Azobenzene-based molecular photoswitches are becoming increasingly important for the development of photoresponsive, functional soft-matter material systems. Upon illumination with light, fast interconversion between a more stable trans- and a metastable cis configuration can be established resulting in pronounced changes in conformation, dipole moment or hydrophobicity. A rational design of functional photosensitive molecules with embedded azo moieties requires a thorough understanding of isomerization mechanisms and rates, especially the thermally activated relaxation...
February 21, 2018: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29450674/risk-assessment-of-pesticides-in-estuaries-a-review-addressing-the-persistence-of-an-old-problem-in-complex-environments
#3
Nagore Cuevas, Marta Martins, Pedro M Costa
Estuaries, coastal lagoons and other transition ecosystems tend to become the ultimate reservoirs of pollutants transported by continental runoff, among which pesticides constitute the class of most concern. High amounts of dissolved and particulated organic matter greatly contribute to the accumulation of pesticides that eventually become trapped in sediments or find their way along food chains. Perhaps not so surprisingly, it is common to find elevated levels of pesticides in estuarine sediments decades after their embargo...
February 15, 2018: Ecotoxicology
https://www.readbyqxmd.com/read/29446496/the-voice-of-nurses-novice-nurses-first-experiences-in-a-clinical-setting-a-longitudinal-diary-study
#4
Yvonne Hoeve Ten, Saskia Kunnen, Jasperina Brouwer, Petrie F Roodbol
AIMS AND OBJECTIVES: To gain greater understanding of which personal and professional demands novice nurses are confronted with and what can be done to improve the transition from novice to professional staff nurse. BACKGROUND: Novice nurses are confronted with a lot of physical, emotional and intellectual changes in the role-transition process from student nurse to professional staff nurse, which are often related to feelings of confusion, uncertainty and stress...
February 15, 2018: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/29445011/understanding-veterinary-leadership-in-practice
#5
Caroline Elizabeth Pearson, Allan J Butler, Yaqub Paul Murray
The Vet Futures Report has identified 'exceptional leadership' as a key ambition for the long-term sustainability of the industry. This research investigates what it is like to be a veterinary surgeon in an in-practice leadership position, applying the qualitative methodology of interpretative phenomenological analysis. Through the researchers' interpretation of the seven participants' stories of their leadership experiences, the study advances understanding of the work environment, underlying motivations and the perceived responsibilities of veterinary leaders...
February 14, 2018: Veterinary Record
https://www.readbyqxmd.com/read/29442772/mechanical-and-electrical-properties-of-direct-spun-carbon-nanotube-fibers-exposed-to-ultrahigh-temperatures-in-vacuum
#6
Xiao-Shan Zhang, Ling-Wei Yang, Hai-Tao Liu, Mei Zu
Carbon nanotube (CNT) fibers are promising reinforcements in ceramic matrix composites where the service environments involve extremely high temperatures that are generally beyond 1000 °C. This work focuses on the thermal stability of a direct spun CNT fiber in vacuum and in a wide temperature (25-2000 °C). The microstructure, mechanical and electrical properties of the fibers as a function of the heat-treatment temperature were investigated. The results show that high temperature exposure could increase the defect density and loosen the packing state of the fiber, but enhance the graphitization degree of the CNTs...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29434507/dynamics-and-locomotion-of-flexible-foils-in-a-frictional-environment
#7
Xiaolin Wang, Silas Alben
Over the past few decades, oscillating flexible foils have been used to study the physics of organismal propulsion in different fluid environments. Here, we extend this work to a study of flexible foils in a frictional environment. When the foil is oscillated by heaving at one end but is not free to locomote, the dynamics change from periodic to non-periodic and chaotic as the heaving amplitude increases or the bending rigidity decreases. For friction coefficients lying in a certain range, the transition passes through a sequence of N-periodic and asymmetric states before reaching chaotic dynamics...
January 2018: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29432473/setup-in-a-clinical-workflow-and-impact-on-radiotherapy-routine-of-an-in-vivo-dosimetry-procedure-with-an-electronic-portal-imaging-device
#8
Jie Li, Angelo Piermattei, Pei Wang, Shengwei Kang, Mingyong Xiao, Bin Tang, Xiongfei Liao, Xin Xin, Mattia Grusio, Lucia Clara Orlandini
High conformal techniques such as intensity-modulated radiation therapy and volumetric-modulated arc therapy are widely used in overloaded radiotherapy departments. In vivo dosimetric screening is essential in this environment to avoid important dosimetric errors. This work examines the feasibility of introducing in vivo dosimetry (IVD) checks in a radiotherapy routine. The causes of dosimetric disagreements between delivered and planned treatments were identified and corrected during the course of treatment...
2018: PloS One
https://www.readbyqxmd.com/read/29432111/toward-drowsiness-detection-using-non-hair-bearing-eeg-based-brain-computer-interfaces
#9
Chun-Shu Wei, Yu-Te Wang, Chin-Teng Lin, Tzyy-Ping Jung
Drowsy driving is one of the major causes that lead to fatal accidents worldwide. For the past two decades, many studies have explored the feasibility and practicality of drowsiness detection using electroencephalogram (EEG)-based brain-computer interface (BCI) systems. However, on the pathway of transitioning laboratory-oriented BCI into real-world environments, one chief challenge is to obtain high-quality EEG with convenience and long-term wearing comfort. Recently, acquiring EEG from non-hair-bearing (NHB) scalp areas has been proposed as an alternative solution to avoid many of the technical limitations resulted from the interference of hair between electrodes and the skin...
February 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29414567/solid-state-speciation-of-uranium-and-its-local-structure-in-sr2ceo4-using-photoluminescence-spectroscopy
#10
M Sahu, Santosh K Gupta, D Jain, M K Saxena, R M Kadam
An effort was taken to carry our speciation study of uranium ion in technologically important cerate host Sr2CeO4 using time resolved photoluminescence spectroscopy. Such studies are not relevant only to nuclear industry but can give rich insight into fundamentals of 5f electron chemistry in solid state systems. In this work both undoped and varied amount of uranium doped Sr2CeO4 compound is synthesized using complex polymerization method and is characterized systematically using X-ray diffraction (XRD), Raman spectroscopy, impedance spectroscopy and scanning electron microscopy (SEM)...
January 26, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29410781/career-perspective-kenneth-j-collins
#11
Kenneth John Collins
A career interest in thermoregulation research has included wide contrasts in the subjects of enquiry, extending from heat stroke to hypothermia, special investigations in many different purpose-built climatic chambers, laboratory-based biomedical studies together with hospital practice, and field work in tropical climates to physiological surveys on urban populations in temperate environments. The scientific process and need to focus on careful planning of experiments, using the most appropriate methods, selecting the right controls and eventually applying correct statistical analysis do not always follow a smooth transition, as illustrated in this account...
2018: Extreme Physiology & Medicine
https://www.readbyqxmd.com/read/29400438/atomic-level-co3o4-layer-stabilized-by-metallic-cobalt-nanoparticles-a-highly-active-and-stable-electrocatalyst-for-oxygen-reduction
#12
Min Liu, Jingjun Liu, Zhilin Li, Feng Wang
Developing atomic-level transition oxides may be one of the most promising ways for providing ultrahigh electro-catalytic performance for oxygen reduction reaction (ORR), compared with their bulk counterparts. In this paper, we developed a set of atomically thick Co3O4 layers covered on Co nanoparticles, through partially reducing Co3O4 nanoparticles using melamine as a reductive additive at an elevated temperature. Compared with the original Co3O4 nanoparticles, the synthesized Co3O4 with a thickness of 1...
February 5, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29383741/chart%C3%A2-stalking-list-making-and-physicians-efforts-to-track-patients-outcomes-after-transitioning-responsibility
#13
Judith L Bowen, Bridget C O'Brien, Jonathan S Ilgen, David M Irby, Olle Ten Cate
CONTEXT: Transitions of patient care responsibility occur frequently between physicians. Resultant discontinuities make it difficult for physicians to observe clinical outcomes. Little is known about what physicians do to overcome the practical challenges to learning these discontinuities create. This study explored physicians' activities in practice as they sought follow-up information about patients. METHODS: Using a constructivist grounded theory approach, semi-structured interviews with 18 internal medicine hospitalist and resident physicians at a single tertiary care academic medical center explored participants' strategies when deliberately conducting follow-up after they transitioned responsibility for patients to other physicians...
January 30, 2018: Medical Education
https://www.readbyqxmd.com/read/29378792/brucella-abortus-senses-the-intracellular-environment-through-the-two-component-system-bvrr-bvrs-allowing-the-adaptation-to-its-replicative-niche
#14
Pamela Altamirano-Silva, Jazmín Meza-Torres, Amanda Castillo-Zeledón, Nazareth Ruiz-Villalobos, Ana Mariel Zuñiga-Pereira, Carlos Chacón-Díaz, Edgardo Moreno, Caterina Guzmán-Verri, Esteban Chaves-Olarte
Brucella abortus is a facultative extracellular-intracellular pathogen belonging a group of α-Proteobacteria that establishes close interactions with animal cells. This bacterium enters host cells in a membrane bound compartment, avoiding the lysosomal route and reaching the endoplasmic reticulum through the action of the Type IV secretion system, VirB. In this work we demonstrate that the two-component system BvrR/BvrS senses the intracellular environment to mount the transcriptional response required for intracellular life adaptation...
January 29, 2018: Infection and Immunity
https://www.readbyqxmd.com/read/29373008/inverse-opal-like-porous-mosex-films-for-hydrogen-evolution-catalysis-overpotential-pore-size-dependence
#15
Xinyi Chia, Martin Pumera
Transition metal dichalcogenides (TMDs) are prized as electrocatalysts for hydrogen evolution reaction (HER). Common TMD syntheses entail conditions of high temperatures and reagents that are detrimental to the environment. The electrochemical synthesis of TMDs is advocated as a viable alternative to the conventional synthetic procedures in terms of simplicity, ecological sustainability, and versatility of deposition on various surfaces at room temperature. In this work, we demonstrate the successful fabrication of electrocatalytic inverse opal porous MoSex films, where 2 ≤ x ≤ 3, via solid template-assisted electrodeposition from the simultaneous electroreduction of molybdic acid and selenium dioxide as the respective metal and chalcogen precursors in an aqueous electrolyte...
January 26, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29370847/rethinking-disability
#16
Alarcos Cieza, Carla Sabariego, Jerome Bickenbach, Somnath Chatterji
Disability as a health outcome deserves more attention than it has so far received. With people living longer and the epidemiological transition from infectious to noncommunicable diseases as the major cause of health burden, we need to focus attention on disability - the non-fatal impact of heath conditions - over and above our concern for causes of mortality.With the first Global Burden of Disease study, WHO provided a metric that enabled the comparison of the impact of diseases, drawing on a model of disability that focused on decrements of health...
January 26, 2018: BMC Medicine
https://www.readbyqxmd.com/read/29355125/the-experiences-and-perceptions-of-persons-with-disabilities-regarding-work-skills-development-in-sheltered-and-protective-workshops
#17
Mohammed Shaheed Soeker, Jo Celene De Jongh, Amy Diedericks, Kelly Matthys, Nicole Swart, Petra van der Pol
BACKGROUND: Protective workshops and sheltered employment settings have been instrumental in developing the work skills of people with disabilities, however there has been a void in the literature about its influence on the ability of individuals to find employment in the open labor market. OBJECTIVE: The aim of the study is to explore the experiences and perceptions of people with disabilities about the development of their work skills for transitioning into the open labor market...
January 18, 2018: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://www.readbyqxmd.com/read/29355033/the-impact-of-operating-room-layout-on-circulating-nurse-s-work-patterns-and-flow-disruptions-a-behavioral-mapping-study
#18
Sara Bayramzadeh, Anjali Joseph, Dee San, Amin Khoshkenar, Kevin Taaffe, Roxana Jafarifiroozabadi, David M Neyens
AIM: To assess how the adjacencies of functionally different areas within operating rooms (ORs) can influence the circulating nurse's (CN) workflow patterns and disruptions. BACKGROUND: The CN plays a significant role in promoting patient safety during surgical procedures by observing, monitoring, and managing potential threats at and around the surgical field. Their work requires constant movement to different parts of the OR to support team members. The layout of the OR and crowded and cluttered environment might impact the CN's workflow and cause disruptions during the surgery...
January 1, 2018: HERD
https://www.readbyqxmd.com/read/29337538/sustainable-polyester-elastomers-from-lactones-synthesis-properties-and-enzymatic-hydrolyzability
#19
Guilhem X De Hoe, Michael T Zumstein, Brandon J Tiegs, Jacob P Brutman, Kristopher McNeill, Michael Sander, Geoffrey W Coates, Marc A Hillmyer
Chemically cross-linked elastomers are an important class of polymeric materials with excellent temperature and solvent resistance. However, nearly all elastomers are petroleum-derived and persist in the environment or in landfills long after they are discarded; this work strives to address these issues by demonstrating the synthesis of renewable, enzymatically hydrolyzable, and mechanically competitive polyester elastomers. The elastomers described were synthesized using a novel bis(β-lactone) cross-linker and star-shaped, hydroxyl-terminated poly(γ-methyl-ε-caprolactone)...
January 16, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29334802/youth-and-young-adults-with-acquired-brain-injury-transition-towards-work-related-roles-a-qualitative-study
#20
Alicia Paniccia, Heather Colquhoun, Bonnie Kirsh, Sally Lindsay
PURPOSE: The purpose of this research was to explore the experiences of youth and young adults with acquired brain injury as they transition towards work-related roles. Little is known about employment experiences among this age group. Understanding their perspectives can inform programs and clinical practice. MATERIALS AND METHODS: A descriptive qualitative design, including semi-structured interviews with 14 participants (8 females; 6 males) was used. Interviews were transcribed verbatim and analyzed using an open-coding, thematic approach...
January 15, 2018: Disability and Rehabilitation
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