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https://www.readbyqxmd.com/read/28548860/direct-imaging-of-kinetic-pathways-of-atomic-diffusion-in-monolayer-molybdenum-disulfide
#1
Jinhua Hong, Yuhao Pan, Zhixin Hu, Danhui Lv, Chuanhong Jin, Wei Ji, Jun Yuan, Ze Zhang
Direct observation of atomic migration both on and below surfaces is a long-standing but important challenge in materials science as diffusion is one of the most elementary processes essential to many vital material behaviors. Probing the kinetic pathways, including metastable or even transition states involved down to atomic scale, holds the key to the underlying physical mechanisms. Here, we applied aberration-corrected transmission electron microscopy (TEM) to demon-strate direct atomic-scale imaging and quasi-real-time tracking of diffusion of Mo adatoms and vacancies in monolayer MoS2, an important 2D transition metal dichalcogenide (TMD) system...
May 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28548048/reliable-passivation-of-black-phosphorus-by-thin-hybrid-coating
#2
Sampath Gamage, Alireza Fali, Neda Aghamiri, Lingming Yang, Pei-De Ye, Yohannes Abate
Black phosphorus (BP) possesses several extraordinary physical properties, which include in-plane anisotropy, thickness dependent direct bandgap and high carrier mobility. These physical properties make BP highly desirable from the point of view of fundamental science and modern optoelectronics applications. The excitement about this material has always been accompanied by unreserved skepticism due to its extraordinary degradation under ambient conditions. Here we show ambient degradation of exfoliated BP can be effectively suppressed using thin layer of hybrid MOCVD coating of BN followed by ALD coating of Al2O3...
May 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28547680/the-influence-of-attention-on-value-integration
#3
Melina A Kunar, Derrick G Watson, Konstantinos Tsetsos, Nick Chater
People often have to make decisions based on many pieces of information. Previous work has found that people are able to integrate values presented in a rapid serial visual presentation (RSVP) stream to make informed judgements on the overall stream value (Tsetsos et al. Proceedings of the National Academy of Sciences of the United States of America, 109(24), 9659-9664, 2012). It is also well known that attentional mechanisms influence how people process information. However, it is unknown how attentional factors impact value judgements of integrated material...
May 25, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28546820/evaluation-of-maternal-neonatal-outcomes-in-vaginal-birth-after-cesarean-delivery-referred-to-maternity-of-academic-hospitals
#4
Masoumeh Mirteymouri, Sedigheh Ayati, Leyla Pourali, Mahboubeh Mahmoodinia, Maliheh Mahmoodinia
Objective: To evaluate the maternal and neonatal complications of vaginal birth after cesarean section (VBAC). Materials and methods: This cross sectional study was conducted in Mashhad University of medical sciences. Eighty women with previous cesarean section who were candidate for VBAC were enrolled the study. Patients were followed up for 6 weeks after delivery. The complication of VBAC was compared between successful or unsuccessful VBAC cases. Data was analyzed by SPSS version 16. Results: VBAC success rate was 91%...
December 2016: Journal of Family & Reproductive Health
https://www.readbyqxmd.com/read/28546583/hybridizing-feature-selection-and-feature-learning-approaches-in-qsar-modeling-for-drug-discovery
#5
Ignacio Ponzoni, Víctor Sebastián-Pérez, Carlos Requena-Triguero, Carlos Roca, María J Martínez, Fiorella Cravero, Mónica F Díaz, Juan A Páez, Ramón Gómez Arrayás, Javier Adrio, Nuria E Campillo
Quantitative structure-activity relationship modeling using machine learning techniques constitutes a complex computational problem, where the identification of the most informative molecular descriptors for predicting a specific target property plays a critical role. Two main general approaches can be used for this modeling procedure: feature selection and feature learning. In this paper, a performance comparative study of two state-of-art methods related to these two approaches is carried out. In particular, regression and classification models for three different issues are inferred using both methods under different experimental scenarios: two drug-like properties, such as blood-brain-barrier and human intestinal absorption, and enantiomeric excess, as a measurement of purity used for chiral substances...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28546559/mapping-few-femtosecond-slices-of-ultra-relativistic-electron-bunches
#6
Tim Plath, Christoph Lechner, Velizar Miltchev, Philipp Amstutz, Nagitha Ekanayake, Leslie Lamberto Lazzarino, Theophilos Maltezopoulos, Jörn Bödewadt, Tim Laarmann, Jörg Roßbach
Free-electron lasers are unique sources of intense and ultra-short x-ray pulses that led to major scientific breakthroughs across disciplines from matter to materials and life sciences. The essential element of these devices are micrometer-sized electron bunches with high peak currents, low energy spread, and low emittance. Advanced FEL concepts such as seeded amplifiers rely on the capability of analyzing and controlling the electron beam properties with few-femtosecond time resolution. One major challenge is to extract tomographic slice parameters instead of projected electron beam properties...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28545918/recent-trends-in-high-spin-sensitivity-magnetic-resonance
#7
Aharon Blank, Ygal Twig, Yakir Ishay
Magnetic resonance is a very powerful methodology that has been employed successfully in many applications for about 70years now, resulting in a wealth of scientific, technological, and diagnostic data. Despite its many advantages, one major drawback of magnetic resonance is its relatively poor sensitivity and, as a consequence, its bad spatial resolution when examining heterogeneous samples. Contemporary science and technology often make use of very small amounts of material and examine heterogeneity on a very small length scale, both of which are well beyond the current capabilities of conventional magnetic resonance...
February 28, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28544779/a-brief-review-of-extrusion-based-tissue-scaffold-bio-printing
#8
REVIEW
Liqun Ning, Xiongbiao Chen
Extrusion-based bio-printing has great potential as a technique for manipulating biomaterials and living cells to create three-dimensional (3D) scaffolds for damaged tissue repair and function restoration. Over the last two decades, advances in both engineering techniques and life sciences have evolved extrusion-based bio-printing from a simple technique to one able to create diverse tissue scaffolds from a wide range of biomaterials and cell types. However, the complexities associated with synthesis of materials for bio-printing and manipulation of multiple materials and cells in bio-printing pose many challenges for scaffold fabrication...
May 24, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28544124/secondary-structure-driven-self-assembly-of-reactive-polypept-o-ides-controlling-size-shape-and-function-of-core-cross-linked-nanostructures
#9
Kristina Klinker, Olga Schäfer, David Huesmann, Tobias Bauer, Leon Capelôa, Lydia Braun, Natascha Stergiou, Meike Schinnerer, Anjaneyulu Dirisala, Kanjiro Miyata, Kensuke Osada, Horacio Cabral, Kazunori Kataoka, Matthias Barz
Achieving precise control over morphology and function of polymeric nanoparticles during self-assembly remains a challenge in material as well as bio-medical sciences, especially when all these properties can be controlled independently. Herein, we report on nanostructures derived from amphiphilic block copolypept(o)ides by secondary structure directed self-assembly, presenting a strategy to adjust core polarity separately from particle preparation in a bio-reversible fashion. The peptide-inherent process of secondary structure-formation allows for the synthesis of spherical and worm-like core cross-linked architectures from the same block copolymer, introducing a simple yet powerful approach to versatile peptide-based nanoparticles...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544063/ag-films-with-hierarchical-chiralities
#10
Shunai Che, Liguo Ma, Yuanyuan Cao, Yingying Duan, Lu Han
Preparing chiral metallic films is one of the primary challenges in materials science. Although physical fabrication methods for metal films with singular and large-sized chirality exist, chemical preparation of that with multi-structured chirality from atomic to larger scales have not been reported yet. Here, we report the chiral molecule-induced formation of chiral Ag films on a copper substrate through a redox reaction. Three levels of chirality were identified, primary twisted 'nanoflakes' with atomic crystal lattices, secondary helical stacking of these nanoflakes to form 'nanoplates' and tertiary micrometre-sized 'circinate' consisting of chiral arranged nanoplates...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28542012/trends-of-training-courses-conducted-in-the-human-resources-development-center-of-the-national-institute-for-quantum-and-radiological-science-and-technology-after-the-fukushima-dai-ichi-nuclear-power-plant-accident
#11
Yuko Shimizu, Haruzo Iida, Mitsuru Nenoi
Environmental contamination with radioactive materials caused by the Fukushima Dai-ichi Nuclear Power Plant (NPP) accident in 2011 raised a serious health concern among residents in Japan, and the demand for radiation experts who can handle the radiation-associated problems has increased. The Human Resources Development Center (HRDC) of the National Institute of for Quantum and Radiological Science and Technology in Japan has offered a variety of training programs covering a wide range of technologies associated with radiation since 1959...
July 2017: Health Physics
https://www.readbyqxmd.com/read/28541354/azaporphyrin-phosphorus-v-complexes-synthesis-structure-and-modification-of-optical-properties
#12
Taniyuki Furuyama, Nagao Kobayashi
Azaporphyrinoids, such as phthalocyanines (Pcs), tetraazaporphyrins (TAPs), and tetrabenzotriazacorroles (TBCs), are some of the most well-known and successful artificial dyes and pigments in modern material chemistry. Modifications of the macrocyclic core, periphery, and central element have attracted a great deal of interest in materials sciences due to generation of unique optical and electronic properties. However, the synthesis of most azaporphyrinoids with novel physical properties generally needs long, tedious procedures...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28540367/lived-lives-a-pavee-perspective-an-arts-science-community-intervention-around-suicide-in-an-indigenous-ethnic-minority
#13
Kevin M Malone, Seamus G McGuinness, Eimear Cleary, Janis Jefferies, Christabel Owens, Cecily C Kelleher
Background: Suicide is a significant public health concern, which impacts on health outcomes. Few suicide research studies have been interdisciplinary. We combined a psychobiographical autopsy with a visual arts autopsy, in which families donated stories, images and objects associated with the lived life of a loved one lost to suicide. From this interdisciplinary research platform, a mediated exhibition was created (Lived Lives) with artist, scientist and families, co-curated by communities, facilitating dialogue, response and public action around suicide prevention...
April 13, 2017: Wellcome Open Research
https://www.readbyqxmd.com/read/28538094/in-situ-atomic-scale-observation-of-droplet-coalescence-driven-nucleation-and-growth-at-liquid-solid-interfaces
#14
Junjie Li, Zhongchang Wang, Francis Leonard Deepak
Unravelling dynamical processes of liquid droplets at liquid/solid interfaces and the interfacial ordering is critical to understanding solidification, liquid-phase epitaxial growth, wetting, liquid-phase joining, crystal growth, and lubrication process, all of which are linked to different important applications in material science. In this work, we observe direct in-situ atomic-scale behaviour of Bi droplets segregated on SrBi2Ta2O9 by using aberration corrected transmission electron microscopy and demonstrate ordered interface and surface structures for the droplets on the oxide at the atomic-scale and unravel a nucleation mechanism involving droplet coalescence at the liquid/solid interface...
May 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28537584/asymmetric-silver-catalysed-intermolecular-bromotrifluoromethoxylation-of-alkenes-with-a-new-trifluoromethoxylation-reagent
#15
Shuo Guo, Fei Cong, Rui Guo, Liang Wang, Pingping Tang
Fluorinated organic compounds are becoming increasingly important in pharmaceuticals, agrochemicals and materials science. The introduction of trifluoromethoxy groups into new drugs and agrochemicals has attracted much attention due to their strongly electron-withdrawing nature and high lipophilicity. However, synthesis of trifluoromethoxylated organic molecules is difficult owing to the decomposition of trifluoromethoxide anion and β-fluoride elimination from transition-metal-trifluoromethoxide complexes, and no catalytic enantioselective trifluoromethoxylation reaction has been reported until now...
June 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28537383/emerging-droplet-microfluidics
#16
Luoran Shang, Yao Cheng, Yuanjin Zhao
Droplet microfluidics generates and manipulates discrete droplets through immiscible multiphase flows inside microchannels. Due to its remarkable advantages, droplet microfluidics bears significant value in an extremely wide range of area. In this review, we provide a comprehensive and in-depth insight into droplet microfluidics, covering fundamental research from microfluidic chip fabrication and droplet generation to the applications of droplets in bio(chemical) analysis and materials generation. The purpose of this review is to convey the fundamentals of droplet microfluidics, a critical analysis on its current status and challenges, and opinions on its future development...
May 24, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28535672/nanofertilizers-new-products-for-the-industry
#17
Christian O Dimkpa, Prem S Bindraban
Mineral fertilizers are key to food production, despite plant low nutrient uptake efficiencies and high losses. However, nanotechnology can both enhance crop productivity and reduce nutrient losses. This has raised interest in nano-scale and nano-enabled bulk fertilizers, hence the concept of nanofertilizers. Nevertheless, large-scale industrial production of nanofertilizers is yet to be realized. Here, we highlight the science-based evidence and outstanding concerns for motivating fertilizer industry production of nanofertilizers, including the notion of toxicity associated with nano-scale materials; scant nanofertilizer research with key crop nutrients; inadequacy of soil- or field-based studies with nanofertilizers; type of nanomaterials to produce as fertilizers; how to efficiently and effectively apply nanofertilizers at the field-scale; and the economics nanofertilizers...
May 24, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28534436/perceptions-of-sport-science-students-on-the-potential-applications-and-limitations-of-blended-learning-in-their-education-a-qualitative-study
#18
Justin W L Keogh, Lisa Gowthorp, Michelle McLean
This study sought to gain insight into blended learning-naive sports science students' understanding and perceptions of the potential benefits and limitations of blended (hybrid) learning, which has been defined as the thoughtful integration of face-to-face and online instructional approaches. Five focus groups, each comprising 3-4 students from either the undergraduate or postgraduate sports science programmes were conducted. The focus groups were facilitated by a researcher who was not involved in sports science...
May 23, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28534207/construction-of-polyarylenes-with-various-structural-features-via-bergman-cyclization-polymerization
#19
REVIEW
Youfu Wang, Shudan Chen, Aiguo Hu
Synthetic polymer chemistry is a fundamental part of polymer science, and highly efficient polymerization reactions are essential for the synthesis of high-performance polymers. Development of new synthetic methods for emerging polymer science is of great importance in this regard. Bergman cyclization is a chemical process in which highly reactive aryl diradicals form from enediyne precursors, having a strong impact in a number of fields including pharmaceutics, synthetic chemistry, and materials science. Diradical intermediates stemming from enediynes can cause DNA cleavage under physiological conditions, leading to the strong cytotoxicity of many naturally occurring enediyne antibiotics...
June 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28533633/photolithography-free-laser-patterned-hf-acid-resistant-chromium-polyimide-mask-for-rapid-fabrication-of-microfluidic-systems-in-glass
#20
Konstantin O Zamuruyev, Yuriy Zrodnikov, Cristina E Davis
Excellent chemical and physical properties of glass, over a range of operating conditions, make it a preferred material for chemical detection systems in analytical chemistry, biology, and the environmental sciences. However, it is often compromised with SU8, PDMS, or Parylene materials due to the sophisticated mask preparation requirements for wet etching of glass. Here, we report our efforts toward developing a photolithography-free laser-patterned hydrofluoric acid-resistant chromium-polyimide tape mask for rapid prototyping of microfluidic systems in glass...
January 2017: Journal of Micromechanics and Microengineering: Structures, Devices, and Systems
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