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https://www.readbyqxmd.com/read/28548520/oxysulfide-lialso-a-lithium-superionic-conductor-from-first-principles
#1
Xuelong Wang, Ruijuan Xiao, Hong Li, Liquan Chen
Through first-principles calculations and crystal structure prediction techniques, we identify a new layered oxysulfide LiAlSO in orthorhombic structure as a novel lithium superionic conductor. Two kinds of stacking sequences of layers of AlS_{2}O_{2} are found in different temperature ranges. Phonon and molecular dynamics simulations verify their dynamic stabilities, and wide band gaps up to 5.6 eV are found by electronic structure calculations. The lithium migration energy barrier simulations reveal the collective interstitial-host ion "kick-off" hopping mode with barriers lower than 50 meV as the dominating conduction mechanism for LiAlSO, indicating it to be a promising solid-state electrolyte in lithium secondary batteries with fast ionic conductivity and a wide electrochemical window...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28545239/lora-scalability-a-simulation-model-based-on-interference-measurements
#2
Jetmir Haxhibeqiri, Floris Van den Abeele, Ingrid Moerman, Jeroen Hoebeke
LoRa is a long-range, low power, low bit rate and single-hop wireless communication technology. It is intended to be used in Internet of Things (IoT) applications involving battery-powered devices with low throughput requirements. A LoRaWAN network consists of multiple end nodes that communicate with one or more gateways. These gateways act like a transparent bridge towards a common network server. The amount of end devices and their throughput requirements will have an impact on the performance of the LoRaWAN network...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28534847/low-power-multi-hop-networking-analysis-in-intelligent-environments
#3
Josu Etxaniz, Gerardo Aranguren
Intelligent systems are driven by the latest technological advances in many different areas such as sensing, embedded systems, wireless communications or context recognition. This paper focuses on some of those areas. Concretely, the paper deals with wireless communications issues in embedded systems. More precisely, the paper combines the multi-hop networking with Bluetooth technology and a quality of service (QoS) metric, the latency. Bluetooth is a radio license-free worldwide communication standard that makes low power multi-hop wireless networking available...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28533981/effects-of-knee-sleeves-on-coordination-of-lower-limb-segments-in-healthy-adults-during-level-walking-and-one-leg-hopping
#4
Chang-Yong Ko, Yunhee Chang, Bora Jeong, Sungjae Kang, Jeicheong Ryu, Gyoosuk Kim
The evaluation of multisegment coordination is important in gaining a better understanding of the gait and physical activities in humans. Therefore, this study aims to verify whether the use of knee sleeves affects the coordination of lower-limb segments during level walking and one-leg hopping. Eleven healthy male adults participated in this study. They were asked to walk 10 m on a level ground and perform one-leg hops with and without a knee sleeve. The segment angles and the response velocities of the thigh, shank, and foot were measured and calculated by using a motion analysis system...
2017: PeerJ
https://www.readbyqxmd.com/read/28531159/a-family-of-aco-routing-protocols-for-mobile-ad-hoc-networks
#5
Delfín Rupérez Cañas, Ana Lucila Sandoval Orozco, Luis Javier García Villalba, Tai-Hoon Kim
In this work, an ACO routing protocol for mobile ad hoc networks based on AntHocNet is specified. As its predecessor, this new protocol, called AntOR, is hybrid in the sense that it contains elements from both reactive and proactive routing. Specifically, it combines a reactive route setup process with a proactive route maintenance and improvement process. Key aspects of the AntOR protocol are the disjoint-link and disjoint-node routes, separation between the regular pheromone and the virtual pheromone in the diffusion process and the exploration of routes, taking into consideration the number of hops in the best routes...
May 22, 2017: Sensors
https://www.readbyqxmd.com/read/28530829/highly-oriented-atomically-thin-ambipolar-mose2-grown-by-molecular-beam-epitaxy
#6
Ming-Wei Chen, Dmitry Ovchinnikov, Sorin Lazar, Michele Pizzochero, Michael Brian Whitwick, Alessandro Surrente, Michal Baranowski, Oriol Lopez Sanchez, Philippe Gillet, Paulina Plochocka, Oleg V Yazyev, Andras Kis
Transition metal dichalcogenides (TMDCs), together with other two-dimensional (2D) materials have attracted great interest due to the unique optical and electrical properties of atomically thin layers. In order to fulfill their potential, developing large-area growth and understanding the properties of TMDCs have become crucial. Here, we used molecular beam epitaxy (MBE) to grow atomically thin MoSe2 on GaAs(111)B. No intermediate compounds were detected at the interface of as-grown films. Careful optimization of the growth temperature can result in the growth of highly aligned films with only two possible crystalline orientations due to broken inversion symmetry...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28528551/robust-bipolar-light-emission-and-charge-transport-in-symmetric-molecular-junctions
#7
Ushula M Tefashe, Quyen Nguyen, Frederic Lafolet, Jean-Christophe Lacroix, Richard L McCreery
Molecular junctions consisting of a Ru(bpy)3 oligomer between conducting carbon contacts exhibit an exponential dependence of junction current on molecular layer thickness (d) similar to that observed for other aromatic devices when d<4 nm. However, when d exceeds 4 nm a change in transport mechanism occurs which coincides with light emission in the range of 600-900 nm. Unlike light emission from electrochemical cells or solid-state films con-taining Ru(bpy)3, emission is bipolar, occurs in vacuum, has rapid rise time (<5 msec), and persists for more than 10 hours...
May 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28528435/benefits-of-a-regular-vs-irregular-rhythm-based-training-programme-on-physical-fitness-and-motor-skills-in-obese-girls
#8
Ghazi Racil, Wassim Elmontassar, Imen Rommene, Claire Tourny, Anis Chaouachi, Jeremy B Coquart
PURPOSE: The aim of the current study was to examine the impact of a physical exercise programme including rhythmic elements (regular and irregular tempos) on physiological variables, motor skills (MS), and jump performances in obese girls. METHODS: Thirty-six obese girls (age: 10.4 ± 0.9 years, body mass: 58.7 ± 4.0 kg, height: 1.37 ± 0.04 m, body mass index: 31.2 ± 2.1) participated in three weekly physical exercise sessions for 6 weeks, with each session consisting of basic fundamental locomotor movements...
May 20, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28527449/correlated-matrix-fluctuation-mediated-activated-transport-of-dilute-penetrants-in-glass-forming-liquids-and-suspensions
#9
Rui Zhang, Kenneth S Schweizer
We formulate a microscopic, force-level statistical mechanical theory for the activated diffusion of dilute penetrants in dense liquids, colloidal suspensions, and glasses. The approach explicitly and self-consistently accounts for coupling between penetrant hopping and matrix dynamic displacements that actively facilitate the hopping event. The key new ideas involve two mechanistically (at a stochastic trajectory level) coupled dynamic free energy functions for the matrix and spherical penetrant particles...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28525268/rational-design-of-novel-allosteric-dihydrofolate-reductase-inhibitors-showing-antibacterial-effects-on-drug-resistant-e-coli-escape-variants
#10
Bharath Srinivasan, João V Rodrigues, Sam Tonddast-Navaei, Eugene Shakhnovich, Jeffrey Skolnick
In drug-discovery, systematic variations of substituents on a common scaffold and bioisosteric replacements are often used to generate diversity and obtain molecules with better biological effects. However, this could saturate the small-molecule diversity pool resulting in drug-resistance. On the other hand, conventional drug-discovery relies on targeting known pockets on protein surfaces leading to drug resistance by mutations of critical pocket residues. Here, we present a two-pronged strategy of designing novel drugs that target unique pockets on a protein's surface to overcome the above problems...
May 19, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28524701/helical-water-wires
#11
A R Liboff, C Poggi, P Pratesi
A helitetrahedral model has been proposed to help explain reports of low-frequency oscillations in pure water following electromagnetic excitation at the hydronium ion cyclotron resonance frequency. The Lorentz force and the intrinsic structure constrain the motion of the H3O(+) ion so that it enjoys a unique form of proton-hopping, one whose path is helical. This model may also explain the numerous previously observed cyclotron resonance (ICR) biological couplings for cations other than hydronium by merely substituting hydrogen-bonded versions of these for hydronium in the tetrahedral structure...
May 19, 2017: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/28524066/a-flight-phase-terrain-following-control-strategy-for-stable-and-robust-hopping-of-a-one-legged-robot-under-large-terrain-variations
#12
Natan Shemer, Amir Degani
This work demonstrates a simple, once per step, flight-phase control method for robots running on a planar unknown rough-terrain environment. The robot used to exemplify these control strategies is the ParkourBot, a Spring-Loaded Inverted Pendulum (SLIP)-based robot. The SLIP model is widely used for the description of humans and animals running motion and has been the basis for many robots. A known control scheme for increasing robustness of the conservative, SLIP model is the Swing Leg Retraction (SLR) method...
May 19, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28521403/comparative-study-on-dosimetry-of-vmat-and-imrt-in-assisted-radiotherapy-after-radical-resection-of-rectal-cancer
#13
Jianguo Shi, Fujun Yang, Xiangbai Ju, Yudong Huang, Fenge Jiang
The present study compared the dosimetric differences of volumetric modulated arc therapy (VMAT) and 7-field intensity modulated radiation therapy technology (7F-IMRT) in assisted radiotherapy plan after resection of rectal carcinoma. Ten cases of patients at stages II-III of rectal cancer transabdominal resection with postoperative pelvic radiotherapy underwent 7F-IMRT and VMAT radiotherapy plan design using the CMS Monaco treatment planning system. We compared the dose distribution, the number of organs at risk and the number of machines in the two groups...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28515975/prospective-functional-performance-testing-and-relationship-to-lower-extremity-injury-incidence-in-adolescent-sports-participants
#14
Joseph Smith, Nick DePhillipo, Iris Kimura, Morgan Kocher, Ronald Hetzler
BACKGROUND: Due to the high number of adolescent athletes and subsequent lower extremity injuries, improvements of injury prevention strategies with emphasis on clinic-based and practical assessments are warranted. PURPOSE: The purpose of this study was to prospectively investigate if a battery of functional performance tests (FPT) could be used as a preseason-screening tool to identify adolescent athletes at risk for sports-related acute lower extremity injury via comparison of injured and uninjured subjects...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515973/intra-rater-reliability-of-the-multiple-single-leg-hop-stabilization-test-and-relationships-with-age-leg-dominance-and-training
#15
Leanne Sawle, Jennifer Freeman, Jonathan Marsden
BACKGROUND: Balance is a complex construct, affected by multiple components such as strength and co-ordination. However, whilst assessing an athlete's dynamic balance is an important part of clinical examination, there is no gold standard measure. The multiple single-leg hop-stabilization test is a functional test which may offer a method of evaluating the dynamic attributes of balance, but it needs to show adequate intra-tester reliability. PURPOSE: The purpose of this study was to assess the intra-rater reliability of a dynamic balance test, the multiple single-leg hop-stabilization test on the dominant and non-dominant legs...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515972/determination-of-clinically-relevant-differences-in-frontal-plane-hop-tests-in-women-s-collegiate-basketball-and-soccer-players
#16
Kelly Hardesty, Eric J Hegedus, Kevin R Ford, Anh-Dung Nguyen, Jeffrey B Taylor
BACKGROUND: ACL injury prevention programs are less successful in female basketball players than in soccer players. Previous authors have identified anthropometric and biomechanical differences between the athletes and different sport-specific demands, including a higher frequency of frontal plane activities in basketball. Current injury risk screening and preventive training practices do not place a strong emphasis on frontal plane activities. The medial and lateral triple hop for distance tests may be beneficial for use in the basketball population...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515444/orbital-angular-momentum-analysis-for-giant-spin-splitting-in-solids-and-nanostructures
#17
Sehoon Oh, Hyoung Joon Choi
Giant spin splitting (GSS) of electronic bands, which is several orders of magnitude greater than the standard Rashba effect has been observed in various systems including noble-metal surfaces and thin films of transition-metal dichalcogenides. Previous studies reported that orbital angular momentum (OAM) is not quenched in some GSS materials and that the atomic spin-orbit interaction (SOI) generates spin splitting in some solid states via the interorbital hopping. Although the unquenched OAM may be closely related to the interorbital hopping, their relationship is hardly studied in the aspect of using the unquenched OAM as a control parameter of GSS...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28513689/proton-conduction-in-a-hydrogen-bonded-complex-of-copper-ii-bipyridine-glycoluril-nitrate
#18
Sakharam B Tayade, Vishal M Dhavale, Avinash S Kumbhar, Sreekumar Kurungot, Peter Lönnecke, Evamarie Hey-Hawkins, Bhalchandra Pujari
Bipyridine glycoluril (BPG), a urea-fused bipyridine tecton, forms a square-pyramidal secondary building unit with copper(ii) which further self-assembles to give a porous hydrogen-bonded complex. This complex displays a high proton conductivity of 4.45 × 10(-3) S cm(-1) at 90 °C and 95% relative humidity (RH). Chains consisting of coordinated water, solvent water and nitrate anions embedded in the complex are responsible for high proton conduction. The proton conduction pathway was corroborated by ab initio electronic structure calculations with molecular dynamics (MD) simulations using the Nudged Elastic Band (NEB) method...
May 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28511906/design-synthesis-and-anti-tumor-activity-study-of-novel-histone-deacetylase-inhibitors-containing-isatin-based-caps-and-o-phenylenediamine-based-zinc-binding-groups
#19
Shuai Gao, Jie Zang, Qianwen Gao, Xuewu Liang, Qinge Ding, Xiaoyang Li, Wenfang Xu, C James Chou, Yingjie Zhang
As a hot topic of epigenetic studies, histone deacetylases (HDACs) are related to lots of diseases, especially cancer. Further researches indicated that different HDAC isoforms played various roles in a wide range of tumor types. Herein a novel series of HDAC inhibitors with isatin-based caps and o-phenylenediamine-based zinc binding groups have been designed and synthesized through scaffold hopping strategy. Among these compounds, the most potent compound 9n exhibited similar if not better HDAC inhibition and antiproliferative activities against multiple tumor cell lines compared with the positive control entinostat (MS-275)...
March 19, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28510441/molybdenum-carbamate-nanosheets-as-a-new-class-of-potential-phase-change-materials
#20
Maksym Zhukovskyi, Vladimir V Plashnitsa, Nattasamon Petchsang, Anthony Ruth, Anshumaan Bajpai, Felix Vietmeyer, Yuanxing Wang, Michael Brennan, Yunsong Pang, Kalpani Werellapatha, Bruce A Bunker, Soma Chattopadhyay, Tengfei Luo, Boldizsar Janko, Patrick Fay, Masaru Kuno
We report, for the first time, the synthesis of large, free-standing, Mo2O2(µ-S)2(Et2dtc)2 (MoDTC) nanosheets (NSs), which exhibit an electron-beam induced crystalline-to-amorphous phase transition. Both electron beam ionization and femtosecond (fs) optical excitation induce the phase transition, which is size-, morphology- and composition-preserving. Resulting NSs are the largest, free standing regularly-shaped two-dimensional amorphous nanostructures made to date. More importantly, amorphization is accompanied by dramatic changes to the NS electrical and optical response wherein resulting amorphous species exhibit room temperature conductivities 5 orders of magnitude larger than those of their crystalline counterparts...
May 16, 2017: Nano Letters
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