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https://www.readbyqxmd.com/read/28813962/a-fundamental-study-on-how-holding-a-helium-filled-balloon-affects-stability-in-human-standing
#1
Keisuke Shima, Koji Shimatani, Gen Sato, Mami Sakata, Psiche Giannoni, Pietro Morasso
Various studies have been conducted in the field of the development/deterioration of standing and walking ability. In standing and walking control strategy, the relationship linking visual/somatosensory/vestibular-system information and physical movement is important. Researchers have previously sought to evaluate attitude control based on human sensory information. The authors have also reported that the body sway of a walking infant is mitigated when the subject holds a helium-filled balloon, with results suggesting that this approach can be applied to extend walking distance...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28802553/effect-of-cold-argon-plasma-on-eggs-of-the-blow-fly-lucilia-cuprina-diptera-calliphoridae
#2
Kwankamol Limsopatham, Dheerawan Boonyawan, Chanchai Umongno, Kabkaew L Sukontason, Tarinee Chaiwong, Rattana Leksomboon, Kom Sukontason
Non-thermal plasma has been used in many medical applications, including treatment of living cells, blood coagulation, wound healing, and sterilization. The process uses an environmentally friendly gas (e.g., argon, helium, oxygen, nitrogen, or hydrogen) to destroy bacteria cells with no serious adverse effect on humans or animals. However, information on the effect of argon plasma on blow fly eggs is lacking. In this study, we explored the ability of cold argon plasma to destroy the eggs of the Australian sheep blow fly, Lucilia cuprina (Wiedemann, 1830); its larvae are a myiasis-producing agent in both human and animals...
August 9, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28800298/impact-of-field-number-and-beam-angle-on-functional-image-guided-lung-cancer-radiotherapy-planning
#3
Bilal A Tahir, Chris M Bragg, Jim M Wild, James A Swinscoe, Sarah E Lawless, Kerry A Hart, Matthew Q Hatton, Rob H Ireland
To investigate the effect of beam angles and field number on functionally-guided intensity modulated radiotherapy (IMRT) normal lung avoidance treatment plans that incorporate hyperpolarised helium-3 magnetic resonance imaging ((3)He MRI) ventilation data. Eight non-small cell lung cancer patients had pre-treatment (3)He MRI that was registered to inspiration breath-hold radiotherapy planning computed tomography. IMRT plans that minimised the volume of total lung receiving  ⩾20 Gy (V20) were compared with plans that minimised (3)He MRI defined functional lung receiving  ⩾20 Gy (fV20)...
August 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28798360/engineering-self-organising-helium-bubble-lattices-in-tungsten
#4
R W Harrison, G Greaves, J A Hinks, S E Donnelly
The self-organisation of void and gas bubbles in solids into superlattices is an intriguing nanoscale phenomenon. Despite the discovery of these lattices 45 years ago, the atomistics behind the ordering mechanisms responsible for the formation of these nanostructures are yet to be fully elucidated. Here we report on the direct observation via transmission electron microscopy of the formation of bubble lattices under He ion bombardment. By careful control of the irradiation conditions, it has been possible to engineer the bubble size and spacing of the superlattice leading to important conclusions about the significance of vacancy supply in determining the physical characteristics of the system...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28793760/prediction-of-the-breakthrough-performance-of-gating-adsorbents-using-osmotic-framework-adsorbed-solution-theory
#5
Francisco J Sotomayor, Christian Lastoskie
We present an experimental and theoretical study of the breakthrough performance of the flexible metal-organic framework Cu(bpy)2(BF4)2 (bpy = 4,4'-bipyridine), termed ELM-11. Pure CO2, He, and N2 gases, as well as binary gas mixtures of those species, were used to perform breakthrough experiments on ELM-11. ELM-11 exhibits a stepped breakthrough curve for CO2 not seen in rigid adsorbents. By comparing the step heights observed in the experimental breakthrough curves with predictions of the gate pressure obtained from the osmotic framework adsorbed solution theory (OFAST) method, we show that the OFAST method can be used to predict the occurrence and height of the steps observed in the breakthrough curves of flexible metal organic frameworks...
August 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28773964/modification-of-lightweight-aggregates-microstructure-by-used-motor-oil-addition
#6
Małgorzata Franus, Grzegorz Jozefaciuk, Lidia Bandura, Krzysztof Lamorski, Mieczysław Hajnos, Wojciech Franus
An admixture of lightweight aggregate substrates (beidellitic clay containing 10 wt % of natural clinoptilolite or Na-P1 zeolite) with used motor oil (1 wt %-8 wt %) caused marked changes in the aggregates' microstructure, measured by a combination of mercury porosimetry (MIP), microtomography (MT), and scanning electron microscopy. Maximum porosity was produced at low (1%-2%) oil concentrations and it dropped at higher concentrations, opposite to the aggregates' bulk density. Average pore radii, measured by MIP, decreased with an increasing oil concentration, whereas larger (MT) pore sizes tended to increase...
October 18, 2016: Materials
https://www.readbyqxmd.com/read/28772459/evolution-of-helium-bubbles-and-discs-in-irradiated-6h-sic-during-post-implantation-annealing
#7
Qiang Shen, Wei Zhou, Guang Ran, Ruixiang Li, Qijie Feng, Ning Li
The single crystal 6H-SiC with [0001] crystal direction irradiated by 400 keV He⁺ ions with 1 × 10(17) ions/cm² fluence at 400 °C were annealed at 600, 900, 1200 and 1400 °C for different durations. The evolution of helium bubbles and discs was investigated by transmission electron microscopy. An irradiated layer distributed with fine helium bubbles was formed with a width of ~170 nm after helium ion irradiation. The size of gas bubbles increased with increasing annealing time and temperature and finally reached stable values at a given annealing temperature...
January 24, 2017: Materials
https://www.readbyqxmd.com/read/28771307/co-registered-in-situ-secondary-electron-and-mass-spectral-imaging-on-the-helium-ion-microscope-demonstrated-using-lithium-titanate-and-magnesium-oxide-nanoparticles
#8
David Dowsett, Tom Wirtz
The development of a high resolution elemental imaging platform combining co-registered secondary ion mass spectrometry and high resolution secondary electron imaging is reported. The basic instrument setup and operation are discussed and in-situ image correlation is demonstrated on a lithium titanate and magnesium oxide nanoparticle mixture. The instrument uses both helium and neon ion beams generated by a gas field ion source to irradiate the sample. Both secondary electrons and secondary ions may be detected...
August 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28768783/the-effect-of-operating-lights-on-laminar-flow-an-experimental-study-using-neutrally-buoyant-helium-bubbles
#9
R Refaie, P Rushton, P McGovern, D Thompson, I Serrano-Pedraza, K S Rankin, M Reed
AIMS: The interaction between surgical lighting and laminar airflow is poorly understood. We undertook an experiment to identify any effect contemporary surgical lights have on laminar flow and recommend practical strategies to limit any negative effects. MATERIALS AND METHODS: Neutrally buoyant bubbles were introduced into the surgical field of a simulated setup for a routine total knee arthroplasty in a laminar flow theatre. Patterns of airflow were observed and the number of bubbles remaining above the surgical field over time identified...
August 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28767313/low-energy-ion-species-dependent-induction-of-dna-double-strand-breaks-ion-energy-and-fluence-thresholds
#10
Prutchayawoot Thopan, Liangdeng Yu, Ian G Brown, Udomrat Tippawan
The goal of this study was to determine the critical ion-radiation conditions under which heavy ion beams can induce DNA double-strand breaks. Helium, nitrogen and argon-ion beams in the energy range of 20 eV to 2 keV were used to irradiate naked DNA plasmid pGFP to fluences of 1, 2 and 4 × 10(15) ions/cm(2). The topological forms of DNA were subsequently analyzed using gel electrophoresis. The DNA forms were changed from the original supercoiled to damaged relaxed and linear forms, depending on the ion mass, energy, fluence and inertia...
August 2, 2017: Radiation Research
https://www.readbyqxmd.com/read/28766630/the-dynamics-of-benzene-on-cu-111-a-combined-helium-spin-echo-and-dispersion-corrected-dft-study-into-the-diffusion-of-physisorbed-aromatics-on-metal-surfaces
#11
M Sacchi, P Singh, D M Chisnall, D J Ward, A P Jardine, W Allison, J Ellis, H Hedgeland
We use helium spin-echo spectroscopy (HeSE) to investigate the dynamics of the diffusion of benzene adsorbed on Cu(111). The results of these measurements show that benzene moves on the surface through an activated jump-diffusion process between the adsorption sites on a Bravais lattice. Density Functional Theory (DFT) calculations with van der Waals (vdW) corrections help us understand that the molecule diffuses by jumping through non-degenerate hollow sites. The results of the calculations shed light on the nature of the binding interaction between this prototypical aromatic molecule and the metallic surface...
August 2, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28764548/cryopump-development-of-the-5-mw-neutral-beam-injector-system-on-hl-2m-tokamak
#12
Xianfu Yang, Jianyong Cao, He Liu, Huiling Wei, Weicheng Liu, Hong Ma
In order to carry out the long pulse and high power neutral beam injector (NBI) heating experiment on the HL-2M tokamak and satisfy its high vacuum pumping speed in the NBI, two built-in cryopumps with large area and based on a three-stage adsorption structure have been developed. The design idea and size of the three stage structure, the manufacturing technique, and the test experiment for cryopumps have been described in this paper. The experimental result shows that the cooldown time of liquid nitrogen pipes and liquid helium pipes are 1...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28762419/efficient-3-he-4-he-separation-in-a-nanoporous-graphenylene-membrane
#13
Yuanyuan Qu, Feng Li, Mingwen Zhao
Helium-3 is a precious noble gas, which is essential in many advanced technologies such as cryogenics, isotope labeling and nuclear weapons. The current imbalance of (3)He demand and supply shortage leads to the search for an efficient membrane with high performance for (3)He separation. In this study, based on first-principles calculations, we demonstrated that highly efficient (3)He harvesting can be achieved in a nanoporous graphenylene membrane with industrially-acceptable selectivity and permeance. The quantum tunneling effect leads to (3)He harvesting with high efficiency via kinetic sieving...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28762335/helium-ions-at-the-heidelberg-ion-beam-therapy-center-comparisons-between-fluka-monte-carlo-code-predictions-and-dosimetric-measurements
#14
T Tessonnier, A Mairani, S Brons, P Sala, F Cerutti, A Ferrari, T Haberer, J Debus, K Parodi
In the field of particle therapy helium ion beams could offer an alternative for radiotherapy treatments, owing to their interesting physical and biological properties intermediate between protons and carbon ions. We present in this work the comparisons and validations of the Monte Carlo FLUKA code against in-depth dosimetric measurements acquired at the Heidelberg Ion Beam Therapy Center (HIT). Depth dose distributions in water with and without ripple filter, lateral profiles at different depths in water and a spread-out Bragg peak were investigated...
August 1, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28762317/effects-of-plasma-activated-medium-on-head-and-neck-fadu-cancerous-cells-comparison-of-3d-and-2d-response
#15
Merbahi Nofel, Julie Chauvin, Patricia Vicendo, Florian Judée
OBJECTIVE: The aim of this work is to investigate the inhibitory effect of Plasma Activated Medium (PAM) on Head and Neck cancerous cells (FaDu).. The response of FaDu cells in monolayer cultures and Multi Cellular Tumor Spheroids (MCTS) after treatment with different PAMs will be compared. BACKGROUND: Head and Neck squamous cell carcinoma is a widespread cancer that responds poorly to anti-cancer treatments such as chemotherapy and radiotherapy. Recently growth interest in cold plasmas and their application in cancer therapy...
August 1, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28759221/nucleophilic-aromatic-addition-in-ionizing-environments-observation-and-analysis-of-new-c-n-valence-bonds-in-complexes-between-naphthalene-radical-cation-and-pyridine
#16
Roberto Peverati, Sean P Platt, Isaac K Attah, Saadullah G Aziz, M Samy El-Shall, Martin Head-Gordon
Radical organic ions can be stabilized by complexation with neutral organics via interactions that can resemble chemical bonds, but with much diminished bond energies. Those interactions are a key factor in cluster growth and polymerization reactions in ionizing environments such as regions of the interstellar medium and solar nebulae. Such radical cation complexes between naphthalene (Naph) and pyridine (Pyr) are characterized using mass-selected ion mobility experiments. The measured enthalpy of binding of the Naph+•(Pyr) heterodimer (20...
July 31, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28758745/exploring-unorthodox-dimensions-for-two-electron-atoms
#17
Dudley R Herschbach, John G Loeser, Wilton L Virgo
Melding quantum and classical mechanics is an abiding quest of physical chemists who strive for heuristic insights and useful tools. We present a surprisingly simple and accurate treatment of ground-state two-electron atoms. It makes use of only the dimensional dependence of a hydrogen atom, together with the exactly known first-order perturbation value of the electron-electron interaction, both quintessentially quantum, and the D → ∞ limit, entirely classical. The result is an analytic formula for D-dimensional two-electron atoms with Z ≥ 2...
August 15, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28757568/electronic-spectroscopy-of-phthalocyanine-and-porphyrin-derivatives-in-superfluid-helium-nanodroplets
#18
REVIEW
Alkwin Slenczka
Phthalocyanine and porphyrin were among the first organic compounds investigated by means of electronic spectroscopy in superfluid helium nanodroplets. Superfluid helium nanodroplets serve as a very gentle host system for preparing cold and isolated molecules. The uniqueness of helium nanodroplets is with respect to the superfluid phase which warrants the vanishing viscosity and, thus, minimal perturbation of the dopant species at a temperature as low as 0.37 K. These are ideal conditions for the study of molecular spectra in order to analyze structures as well as dynamic processes...
July 25, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28755352/genetic-transformation-of-date-palm-via-microprojectile-bombardment
#19
Mousa Mousavi, Amir Mousavi, Ali A Habashi, Kazem Arzani, Bahareh Dehsara, Mohsen Brajeh
Efficient protocols for date palm embryogenic callus and somatic embryo transformation with uidA gene are described in this chapter. The embryogenic callus transformation procedure is 1.6 μm gold particle size coated with 2.5 μg DNA (pAct1-D plasmid), 1100 psi helium pressure, 9 cm target distance, 26 inHg vacuum pressure, 3 mm distance between the rupture disk and macrocarrier, and osmotic pretreatment with 0.4 M mannitol followed by 60 min air desiccation. The somatic embryo transformation procedure is 0...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28745440/design-rules-for-oxygen-evolution-catalysis-at-porous-iron-oxide-electrodes-thousand-fold-current-density-increase
#20
Sandra Haschke, Dmitrii Pankin, Yuri Petrov, Sebastian Bochmann, Alina Manshina, Julien Bachmann
Nanotubular iron(III) oxide electrodes are optimized for catalytic proficiency in the water oxidation reaction at neutral pH. Nanostructured electrodes are prepared from anodic alumina templates coated with Fe2O3 by atomic layer deposition. Scanning helium ion microscopy, X-ray diffraction and Raman spectroscopy characterize the morphology and phase of samples submitted to various treatments. These methods document the contrasting effects of thermal annealing, on the one hand, and of electrochemical treatment, on the other hand...
July 26, 2017: ChemSusChem
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