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https://www.readbyqxmd.com/read/28076418/sensorless-modeling-of-varying-pulse-width-modulator-resolutions-in-three-phase-induction-motors
#1
Matthew David Marko, Glenn Shevach
A sensorless algorithm was developed to predict rotor speeds in an electric three-phase induction motor. This sensorless model requires a measurement of the stator currents and voltages, and the rotor speed is predicted accurately without any mechanical measurement of the rotor speed. A model of an electric vehicle undergoing acceleration was built, and the sensorless prediction of the simulation rotor speed was determined to be robust even in the presence of fluctuating motor parameters and significant sensor errors...
2017: PloS One
https://www.readbyqxmd.com/read/28071906/single-conformation-spectroscopy-of-suberoylanilide-hydroxamic-acid-saha-a-molecule-bites-its-tail
#2
Di Zhang, Karl N Blodgett, Xiao Zhu, Timothy S Zwier
Suberoylanilide hydroxamic acid (C6H5NHCO(CH2)6CONHOH, SAHA) is a histone deacetylase inhibitor that causes growth arrest and differentiation of many tumor types and is an approved drug for the treatment of cancer. With a hydrogen-bonding amide group adjacent to its phenyl ring "head", and a hydroxamic acid group at the "tail" end of a C6 alkyl chain linker, SAHA possesses an interesting potential energy landscape to be probed by single-conformation methods. The alkyl chain's preference for extended structures is in competition with tail-to-head (T-H) or head-to-tail (H-T) hydrogen bonds between the amide and hydroxamic acid groups...
January 10, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28070082/evaluation-of-structural-isomers-molecular-interactions-reactivity-descriptors-and-vibrational-analysis-of-tretinoin
#3
T Karthick, Poonam Tandon, Swapnil Singh
Tretinoin is known to be a pharmaceutical drug for treating acne vulgaris, keratosis pilaris, and acute promyelocytic leukemia. In order to reveal the possible conformers of tretinoin, the energies of all the conformers through rotational bonds have been evaluated by systematic rotor search analysis. The intramolecular interactions ranging from strong hydrogen bonds to weak van der Waals forces present in tretinoin have been distinguished with the help of electron density mapping and wavefunction analysis. The global reactivity descriptors and Fukui functions of tretinoin have been calculated and discussed...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28067047/solvatochromic-and-fluorogenic-dyes-as-environment-sensitive-probes-design-and-biological-applications
#4
Andrey S Klymchenko
Fluorescent environment-sensitive probes are specially designed dyes that change their fluorescence intensity (fluorogenic dyes) or color (e.g., solvatochromic dyes) in response to change in their microenvironment polarity, viscosity, and molecular order. The studies of the past decade, including those of our group, have shown that these molecules become universal tools in fluorescence sensing and imaging. In fact, any biomolecular interaction or change in biomolecular organization results in modification of the local microenvironment, which can be directly monitored by these types of probes...
January 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28060324/measurement-of-outgassing-rates-of-steels
#5
Chongdo Park, Se-Hyun Kim, Sanghoon Ki, Taekyun Ha, Boklae Cho
Steels are commonly used materials in the fabrication of vacuum systems because of their good mechanical, corrosion, and vacuum properties. A variety of steels meet the criterion of low outgassing required for high or ultrahigh vacuum applications. However, a given material can present different outgassing rates depending on its manufacturing process or the various pretreatment processes involved during the fabrication. Thus, the measurement of outgassing rates is highly desirable for a specific vacuum application...
December 13, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28056567/development-of-a-fast-lean-and-agile-direct-pelletization-process-using-experimental-design-techniques
#6
Stavros N Politis, Dimitrios M Rekkas
A novel hot melt direct pelletization method was developed, characterized and optimized, using statistical thinking and experimental design tools. Mixtures of carnauba wax (CW) and HPMC K100M were spheronized using melted gelucire 50-13 as a binding material (BM). Experimentation was performed sequentially; a fractional factorial design was set up initially to screen the factors affecting the process, namely spray rate, quantity of BM, rotor speed, type of rotor disk, lubricant-glidant presence, additional spheronization time, powder feeding rate and quantity...
January 5, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28055918/stability-of-rotor-hopfield-neural-networks-with-synchronous-mode
#7
Masaki Kobayashi
A complex-valued Hopfield neural network (CHNN) is a model of a Hopfield neural network using multistate neurons. The stability conditions of CHNNs have been widely studied. A CHNN with a synchronous mode will converge to a fixed point or a cycle of length 2. A rotor Hopfield neural network (RHNN) is also a model of a multistate Hopfield neural network. RHNNs have much higher storage capacity and noise tolerance than CHNNs. We extend the theories regarding the stability of CHNNs to RHNNs. In addition, we investigate the stability of RHNNs with the projection rule...
December 29, 2016: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28049775/synchronization-of-budding-yeast-by-centrifugal-elutriation
#8
Adam P Rosebrock
In yeast, cell size is normally tightly linked to cell cycle progression. Centrifugal elutriation is a method that fractionates cells based on the physical properties of cell size-fluid drag and buoyant density. Using a specially modified centrifuge and rotor system, cells can be physically separated into one or more cohorts of similar size and therefore cell cycle position. Small G1 daughters are collected first, followed by successively larger cells. Elutriated populations can be analyzed immediately or can be returned to medium and permitted to synchronously progress through the cell cycle...
January 3, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28049583/purification-of-semiconducting-single-walled-carbon-nanotubes-by-spiral-counter-current-chromatography
#9
Martha Knight, Rodrigo Lazo-Portugal, Saeyoung Nate Ahn, Steingrimur Stefansson
Over the last decade man-made carbon nanostructures have shown great promise in electronic applications, but they are produced as very heterogeneous mixtures with different properties so the achievement of a significant commercial application has been elusive. The dimensions of single-wall carbon nanotubes are generally a nanometer wide, up to hundreds of microns long and the carbon nanotubes have anisotropic structures. They are processed to have shorter lengths but they need to be sorted by diameter and chirality...
December 24, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28049339/relocking-of-intrinsic-angular-momenta-in-collisions-of-diatoms-with-ions-capture-of-h2-j-0-1-by-h2
#10
E I Dashevskaya, I Litvin, E E Nikitin, J Troe
Rate coefficients for capture of H2(j = 0,1) by H2(+) are calculated in perturbed rotor approximation, i.e., at collision energies considerably lower than Bhc (where B denotes the rotational constant of H2). The results are compared with the results from an axially nonadiabatic channel (ANC) approach, the latter providing a very good approximation from the low-temperature Bethe-Wigner to the high temperature Langevin limit. The classical ANC approximation performs satisfactorily at temperatures above 0.1 K...
December 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28040435/in-vitro-investigation-of-the-hemodynamic-responses-of-the-cerebral-coronary-and-renal-circulations-with-a-rotary-blood-pump-installed-in-the-descending-aorta
#11
M A Rezaienia, G Paul, E J Avital, S Mozafari, M Rothman, T Korakianitis
This study investigates the hemodynamic responses of the cardiovascular system when a rotary blood pump is operating in the descending aorta, with a focus on the cerebral, coronary and renal autoregulation, using our in-house cardiovascular emulator. Several improvements have been made from our previous studies. A novel coronary system was developed to replicate the native coronary perfusion. Three pinch valves actuated by stepper motors were used to simulate the regional autoregulation systems of the native cerebral, coronary and renal circulations...
December 28, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28039924/focal-impulse-and-rotor-modulation-for-the-treatment-of-atrial-fibrillation-locations-and-one-year-outcomes-of-human-rotors-identified-using-a-64-electrode-basket-catheter
#12
Roland Richard Tilz, Tina Lin, Andreas Rillig, Christian-H Heeger, Leonie Scholz, Peter Wohlmuth, Tudor Bucur, Andreas Metzner, Shibu Mathew, Erik Wissner, Feifan Ouyang, Karl-Heinz Kuck
INTRODUCTION: Pulmonary vein isolation (PVI) is currently the gold standard for catheter ablation of atrial fibrillation (AF). The mechanism for AF-maintenance is still controversial. The concept of rapidly-activating spiral rotors perpetuating AF has led to the development of several rotor-mapping systems. We present our experience with focal impulse and rotor modulation (FIRM) using a 64-electrode basket catheter and computational system and evaluate its feasibility in conjunction with PVI to treat AF...
December 31, 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28032745/biobased-high-performance-rotary-micromotors-for-individually-reconfigurable-micromachine-arrays-and-microfluidic-applications
#13
Kwanoh Kim, Zexi Liang, Minliang Liu, Donglei Emma Fan
In this work, we report an innovative type of rotary bio-micromachines by using diatom frustules as integrated active components, including the assembling, operation, and performance characterization. We further investigate and demonstrate unique applications of the bio-micromachines in achieving individually reconfigurable micromachine arrays and microfluidic mixing. Diatom frustules are porous cell walls of diatoms made of silica. We assembled rotary micromachines consisting of diatom frustules serving as rotors and patterned magnets serving as bearings in electric fields...
December 29, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28031354/intra-arterial-nitroglycerin-as-directed-acute-treatment-in-experimental-ischemic-stroke
#14
Michael E Maniskas, Jill M Roberts, Rebecca Trueman, Annastazia E Learoyd, Amanda Gorman, Justin F Fraser, Gregory J Bix
BACKGROUND: Nitroglycerin (also known as glyceryl trinitrate (GTN)), a vasodilator best known for treatment of ischemic heart disease, has also been investigated for its potential therapeutic benefit in ischemic stroke. The completed Efficacy of Nitric Oxide in Stroke trial suggested that GTN has therapeutic benefit with acute (within 6 hours) transdermal systemic sustained release therapy. OBJECTIVE: To examine an alternative use of GTN as an acute therapy for ischemic stroke following successful recanalization...
December 28, 2016: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28028999/automated-nucleic-acid-extraction-systems-for-detecting-cytomegalovirus-and-epstein-barr-virus-using-real-time-pcr-a-comparison-study-between-the-qiasymphony-rgq-and-qiacube-systems
#15
Hanah Kim, Mina Hur, Ji Young Kim, Hee Won Moon, Yeo Min Yun, Hyun Chan Cho
BACKGROUND: Cytomegalovirus (CMV) and Epstein-Barr virus (EBV) are increasingly important in immunocompromised patients. Nucleic acid extraction methods could affect the results of viral nucleic acid amplification tests. We compared two automated nucleic acid extraction systems for detecting CMV and EBV using real-time PCR assays. METHODS: One hundred and fifty-three whole blood (WB) samples were tested for CMV detection, and 117 WB samples were tested for EBV detection...
March 2017: Annals of Laboratory Medicine
https://www.readbyqxmd.com/read/28013221/biochemical-characterization-of-the-flagellar-stator-associated-inner-membrane-protein-flil-from-vibrio-alginolyticus
#16
Ananthanarayanan Kumar, Miyu Isumi, Mayuko Sakuma, Shiwei Zhu, Yuuki Nishino, Yasuhiro Onoue, Seiji Kojima, Yohei Miyanoiri, Katsumi Imada, Michio Homma
The flagellar motor is embedded in the cell envelope and rotates upon interaction between the stator and the rotor. The rotation is powered by ion flow through the stator. A single transmembrane protein named FliL is associated with torque generation in the flagellar motor. We established an Escherichia coli over-expression system for FliL of Vibrio alginolyticus, a marine bacterium that has a sodium-driven polar flagellum. We successfully expressed, purified, and crystallized the ca. 17 kDa full-length FliL protein and generated a construct that expresses only the ca...
December 24, 2016: Journal of Biochemistry
https://www.readbyqxmd.com/read/28011842/modelling-methodology-of-atrial-fibrosis-affects-rotor-dynamics-and-electrograms
#17
Caroline H Roney, Jason D Bayer, Sohail Zahid, Marianna Meo, Patrick M J Boyle, Natalia A Trayanova, Michel Haïssaguerre, Rémi Dubois, Hubert Cochet, Edward J Vigmond
AIMS: Catheter ablation is an effective technique for terminating atrial arrhythmia. However, given a high atrial fibrillation (AF) recurrence rate, optimal ablation strategies have yet to be defined. Computer modelling can be a powerful aid but modelling of fibrosis, a major factor associated with AF, is an open question. Several groups have proposed methodologies based on imaging data, but no comparison to determine which methodology best corroborates clinically observed reentrant behaviour has been performed...
December 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/27996253/efficient-approximation-of-ligand-rotational-and-translational-entropy-changes-upon-binding-for-use-in-mm-pbsa-calculations
#18
Ido Y Ben-Shalom, Stefania Pfeiffer-Marek, Karl-Heinz Baringhaus, Holger Gohlke
A major uncertainty in binding free energy estimates for protein-ligand complexes by methods such as MM-PB(GB)SA or docking scores results from neglecting or approximating changes in the configurational entropies (Sconfig.) of the solutes. In MM/PB(GB)SA-type calculations, Sconfig. has usually been estimated in the rigid rotor, harmonic oscillator approximation. Here, we present the development of a computationally efficient method (termed BEERT) to approximate Sconfig. in terms of the reduction in translational and rotational freedom of the ligand upon protein-ligand binding (SR/T), starting from the flexible molecule approach...
December 20, 2016: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/27995926/suppression-of-kasha-s-rule-as-a-mechanism-for-fluorescent-molecular-rotors-and-aggregation-induced-emission
#19
Hai Qian, Morgan E Cousins, Erik H Horak, Audrey Wakefield, Matthew D Liptak, Ivan Aprahamian
Although there are some proposed explanations for aggregation-induced emission, a phenomenon with applications that range from biosensors to organic light-emitting diodes, current understanding of the quantum-mechanical origin of this photophysical behaviour is limited. To address this issue, we assessed the emission properties of a series of BF2-hydrazone-based dyes as a function of solvent viscosity. These molecules turned out to be highly efficient fluorescent molecular rotors. This property, in addition to them being aggregation-induced emission luminogens, enabled us to probe deeper into their emission mechanism...
January 2017: Nature Chemistry
https://www.readbyqxmd.com/read/27991970/experimental-validation-of-a-bearing-wear-model-using-the-directional-response-of-the-rotor-bearing-system
#20
Tiago Henrique Machado, Katia L Cavalca
The present work gives continuity in the analysis of the wear influence on cylindrical hydrodynamic bearings by presenting an experimental validation of the wear model previously proposed by the authors. This validation is carried on using the frequency response of the rotor-bearings system in directional coordinates. For this purpose, a test rig was assembled in order to evaluate the behavior of the rotating system when supported by hydrodynamic bearings with different wear patterns. The experimental measurements are used to validate the wear model, comparing the anisotropy influence on the experimental and numerical responses...
October 2016: Anais da Academia Brasileira de Ciências
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