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https://www.readbyqxmd.com/read/29351229/joint-bearing-and-range-estimation-of-multiple-objects-from-time-frequency-analysis
#1
Jeng-Cheng Liu, Yuang-Tung Cheng, Hsien-Sen Hung
Direction-of-arrival (DOA) and range estimation is an important issue of sonar signal processing. In this paper, a novel approach using Hilbert-Huang transform (HHT) is proposed for joint bearing and range estimation of multiple targets based on a uniform linear array (ULA) of hydrophones. The structure of this ULA based on micro-electro-mechanical systems (MEMS) technology, and thus has attractive features of small size, high sensitivity and low cost, and is suitable for Autonomous Underwater Vehicle (AUV) operations...
January 19, 2018: Sensors
https://www.readbyqxmd.com/read/29350933/reproducing-the-ensemble-average-polar-solvation-energy-of-a-protein-from-a-single-structure-gaussian-based-smooth-dielectric-function-for-macromolecular-modeling
#2
Arghya Chakravorty, Zhe Jia, Lin Li, Shan Zhao, Emil Alexov
Typically, the ensemble average polar component of solvation energy (∆G_polar^solv) of a macromolecule is computed using molecular dynamics (MD) or Monte Carlo (MC) simulations to generate conformational ensemble and then single/rigid conformation solvation energy calculation is performed on each of snapshots. The primary objective of this work is to demonstrate that Poisson-Boltzmann (PB) based approach using a Gaussian-based smooth dielectric function for macromolecular modeling previously developed by us (Li et al...
January 19, 2018: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29349453/a-qm-mm-and-qm-qm-mm-study-of-kerr-cotton-mouton-and-jones-linear-birefringences-in-liquid-acetonitrile
#3
Tobias Fahleson, Jógvan Magnus Haugaard Olsen, Patrick Norman, Antonio Rizzo
QM/MM and QM/QM/MM protocols are applied to the ab initio study of the three linear birefringences Kerr, Cotton-Mouton, and Jones, as shown by acetonitrile in the gas and pure liquid phases. The relevant first-order properties as well as linear, quadratic, and cubic frequency-dependent response functions were computed using time-dependent Kohn-Sham density-functional theory with use of the standard CAM-B3LYP functional. In the liquid phase, a series of room temperature (293.15 K) molecular dynamics snapshots were selected, for which averaged values of the observables were obtained at an optical wavelength of 632...
January 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29348210/toward-dynamic-structural-biology-two-decades-of-single-molecule-f%C3%A3-rster-resonance-energy-transfer
#4
REVIEW
Eitan Lerner, Thorben Cordes, Antonino Ingargiola, Yazan Alhadid, SangYoon Chung, Xavier Michalet, Shimon Weiss
Classical structural biology can only provide static snapshots of biomacromolecules. Single-molecule Förster resonance energy transfer (smFRET) paved the way for studying dynamics in macromolecular structures under biologically relevant conditions. Since its first implementation in 1996, smFRET experiments have confirmed previously hypothesized mechanisms and provided new insights into many fundamental biological processes, such as DNA maintenance and repair, transcription, translation, and membrane transport...
January 19, 2018: Science
https://www.readbyqxmd.com/read/29347104/visibility-graphs-of-random-scalar-fields-and-spatial-data
#5
Lucas Lacasa, Jacopo Iacovacci
We extend the family of visibility algorithms to map scalar fields of arbitrary dimension into graphs, enabling the analysis of spatially extended data structures as networks. We introduce several possible extensions and provide analytical results on the topological properties of the graphs associated to different types of real-valued matrices, which can be understood as the high and low disorder limits of real-valued scalar fields. In particular, we find a closed expression for the degree distribution of these graphs associated to uncorrelated random fields of generic dimension...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347032/subspace-dynamic-mode-decomposition-for-stochastic-koopman-analysis
#6
Naoya Takeishi, Yoshinobu Kawahara, Takehisa Yairi
The analysis of nonlinear dynamical systems based on the Koopman operator is attracting attention in various applications. Dynamic mode decomposition (DMD) is a data-driven algorithm for Koopman spectral analysis, and several variants with a wide range of applications have been proposed. However, popular implementations of DMD suffer from observation noise on random dynamical systems and generate inaccurate estimation of the spectra of the stochastic Koopman operator. In this paper, we propose subspace DMD as an algorithm for the Koopman analysis of random dynamical systems with observation noise...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29345906/prediction-of-hot-spots-at-myeloid-cell-leukemia-1-inhibitors-interface-using-energy-estimation-and-alanine-scanning-mutagenesis
#7
Parthiban Marimuthu, Kalaimathy Singaravelu
Myeloid cell leukemia 1 (Mcl1) is an anti-apoptotic protein that plays central role in apoptosis regulation. Also, Mcl1 has the potency to resist apoptotic cues resulting in up-regulation and cancer cell protection. A molecular probe that has the potential to specifically target Mcl1, and thereby provoke its down-regulatory activity is very essential. The aim of the current study is to probe the internal conformational dynamics of protein motions and potential binding mechanism in response to a series of picomolar range Mcl1 inhibitors using explicit-solvent molecular dynamics (MD) simulations...
January 18, 2018: Biochemistry
https://www.readbyqxmd.com/read/29345270/energetics-and-dynamics-of-the-non-natural-fluorescent-4ap-dap-base-pair
#8
Mohit Chawla, Ida Autiero, Romina Oliva, Luigi Cavallo
The fluorescent non-natural 4-aminophthalimide (4AP) base, when paired to the complementary 2,4-diaminopyrimidine (DAP) nucleobase, is accommodated in a B-DNA duplex being efficiently recognized and incorporated by DNA polymerases. To complement the experimental studies and rationalize the impact of the above non-natural bases on the structure, stability and dynamics of nucleic acid structures, we performed quantum mechanics (QM) calculations along with classical molecular dynamics (MD) simulations. QM calculations were initially focused on the geometry and energetics of the 4AP:DAP non-natural pair and of H-bonded base pairs between 4AP and all the natural bases in their classical Watson-Crick geometries...
January 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29339839/trends-in-trauma-related-mortality-among-adolescents-a-6-year-snapshot-from-a-teaching-hospital-s-post-mortem-data
#9
Sachil Kumar, Anoop K Verma
Introduction: The aim is to explore the trends in trauma mortality in children aged 0-18 years can help to co-ordinate resources toward research and programs to reduce the burden. Methods: This is a retrospective study carried out on adolescents ≤18 years of age autopsied according to the attorney request at Forensic Medicine & Toxicology department of King George's Medical University, Lucknow, India in the period from January 1st, 2009 to December 31st, 2014...
November 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/29339657/the-practical-management-of-chronic-pancreatitis-a-multidisciplinary-symposium-held-at-the-annual-meeting-of-the-pancreatic-society-of-great-britain-and-ireland-manchester-2016
#10
Santhalingam Jegatheeswaran, Joanne M Puleston, Sinead Duggan, Andrew Hart, Kevin C Conlon, Ajith K Siriwardena
AIM: This study is about a questionnaire survey of delegates attending the chronic pancreatitis symposium at the 2016 meeting of the Pancreatic Society of Great Britain and Ireland and seeks a multidisciplinary "snapshot" overview of practice. METHODS: A questionnaire was developed with multidisciplinary input. Questions on access to specialist care, methods of diagnosis and treatment including specific scenarios were incorporated. Eighty-three (66%) of 125 delegates effectively participated in this survey...
January 16, 2018: Digestive Surgery
https://www.readbyqxmd.com/read/29335694/the-seventh-biennial-berry-health-benefits-symposium
#11
EDITORIAL
Navindra P Seeram, Britt Burton-Freeman
Research advancing current scientific understanding of the health benefits of berries continues to increase. The Berry Health Benefits Symposium (BHBS) is a biennial meeting highlighting the most recent berry health benefits research from all over the world. Pismo Beach, California was the venue for the seventh biennial BHBS in 2017, and featured oral invited papers on heart health and healthy aging, gut/microbiome health, brain aging, inflammation, cancer prevention, berry special topics, technology and chemistry...
January 16, 2018: Food & Function
https://www.readbyqxmd.com/read/29328920/snapshot-mitochondrial-nucleoid
#12
Nina A Bonekamp, Nils-Göran Larsson
Mitochondrial DNA is compacted into nucleoprotein complexes denoted mitochondrial nucleoids, the focus of this SnapShot.
January 11, 2018: Cell
https://www.readbyqxmd.com/read/29328161/ultrafast-and-low-power-crystallization-in-ge1sb2te4-and-ge1sb4te7-thin-films-using-femtosecond-laser-pulses
#13
Smriti Sahu, Rituraj Sharma, K V Adarsh, Anbarasu Manivannan
Rapid and reversible switching between amorphous and crystalline phases of phase-change material promises to revolutionize the field of information processing with a wide range of applications including electronic, optoelectronics, and photonic memory devices. However, achieving faster crystallization is a key challenge. Here, we demonstrate femtosecond-driven transient inspection of ultrafast crystallization of as-deposited amorphous Ge1Sb2Te4 and Ge1Sb4Te7 thin films induced by a series of 120 fs laser pulses...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328152/single-shot-dual-mode-water-immersion-microscopy-platform-for-biological-applications
#14
José Ángel Picazo-Bueno, Dan Cojoc, Federico Iseppon, Vincent Torre, Vicente Micó
A single-shot water-immersion digital holographic microscope combined with broadband (white light) illumination mode is presented. This double imaging platform allows conventional incoherent visualization with phase holographic imaging of inspected samples. The holographic architecture is implemented at the image space (that is, after passing the microscope lens), thus reducing the sensitivity of the system to vibrations and/or thermal changes in comparison to regular interferometers. Because of the off-axis holographic recording principle, quantitative phase images of live biosamples can be recorded in a single camera snapshot at full-field geometry without any moving parts...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328123/on-the-fundamental-comparison-between-unfocused-and-focused-light-field-cameras
#15
Shuaishuai Zhu, Andy Lai, Katherine Eaton, Peng Jin, Liang Gao
Light field cameras have been extensively used in a variety of applications, thanks to their snapshot three-dimensional imaging capability. However, little is known regarding their pros and cons for a given application. Herein we report a fundamental comparison between two types of light field cameras-focused and unfocused. Our results indicate that the unfocused light field camera outperforms its focused counterpart in depth range and number of resolvable depth steps, while the focused light field camera has an edge in lateral resolution and reconstruction accuracy...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29325402/assessing-patient-organization-participation-in-health-policy-a-comparative-study-in-france-and-italy
#16
Kyriakos Souliotis, Eirini Agapidaki, Lily Evangelia Peppou, Chara Tzavara, Dimitrios Varvaras, Oreste Claudio Buonomo, Dominique Debiais, Stanimir Hasurdjiev, Francois Sarkozy
BACKGROUND: Even though there are many patient organizations across Europe, their role in impacting health policy decisions and reforms has not been well documented. In line with this, the present study endeavours to fill this gap in the international literature. To this end, it aims to validate further a previously developed instrument (the Health Democracy Index - HDI) measuring patient organization participation in health policy decision-making. In addition, by utilizing this tool, it aims to provide a snapshot of the degree and impact of cancer patient organization (CPO) participation in Italy and France...
April 15, 2017: International Journal of Health Policy and Management
https://www.readbyqxmd.com/read/29324400/determination-of-atomic-positions-from-time-resolved-high-resolution-transmission-electron-microscopy-images
#17
Zahra Hussaini, Pin Ann Lin, Bharath Natarajan, Wenhui Zhu, Renu Sharma
For many reaction processes, such as catalysis, phase transformations, nanomaterial synthesis etc., nanoscale observations at high spatial (sub-nanometer) and temporal (millisecond) resolution are required to characterize and comprehend the underlying factors that favor one reaction over another. The combination of such spatial and temporal resolution (up to 600 µs), while rich in information, produces a large number of snapshots, each of which must be analyzed to obtain the structural (and thereby chemical) information...
December 28, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/29323685/coarsening-dynamics-of-ferromagnetic-granular-networks-experimental-results-and-simulations
#18
Armin Kögel, Pedro A Sánchez, Robin Maretzki, Tom Dumont, Elena S Pyanzina, Sofia S Kantorovich, Reinhard Richter
We investigate the phase separation of a shaken mixture of glass and magnetised steel spheres after a sudden quench of the shaker amplitude. After quenching, transient networks of steel spheres emerge in the experiment. For the developing network clusters we estimate the number of spheres in them, and the characteristic path lengths. We find that both quantities follow a log-normal distribution function. Moreover, we study the temporal evolution of the networks. In the sequence of snapshots we observe an initial regime, where the network incubates, followed by a temporal regime where network structures are elongated and broken, and finally a regime where the structures have relaxed to compact clusters of rounded shapes...
January 11, 2018: Soft Matter
https://www.readbyqxmd.com/read/29322598/erythritol-production-by-yeasts-a-snapshot-of-current-knowledge
#19
REVIEW
Frédéric Carly, Patrick Fickers
Erythritol is a four-carbon sugar alcohol produced by microorganisms as an osmoprotectant. It could be used as a natural sweetener in the pharmaceutical and food industries. Here, a snapshot on current knowledge on erythritol metabolism and synthesis, optimization of its production, more precisely process and producer strain improvement is presented.
January 11, 2018: Yeast
https://www.readbyqxmd.com/read/29321473/ancient-environmental-dna-reveals-shifts-in-dominant-mutualisms-during-the-late%C3%A2-quaternary
#20
Martin Zobel, John Davison, Mary E Edwards, Christian Brochmann, Eric Coissac, Pierre Taberlet, Eske Willerslev, Mari Moora
DNA-based snapshots of ancient vegetation have shown that the composition of high-latitude plant communities changed considerably during the late Quaternary. However, parallel changes in biotic interactions remain largely uninvestigated. Here we show how mutualisms involving plants and heterotrophic organisms varied during the last 50,000 years. During 50-25 ka BP, a cool period featuring stadial-interstadial fluctuations, arbuscular mycorrhizal and non-N-fixing plants predominated. During 25-15 ka BP, a cold, dry interval, the representation of ectomycorrhizal, non-mycorrhizal and facultatively mycorrhizal plants increased, while that of N-fixing plants decreased further...
January 10, 2018: Nature Communications
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